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Tools are the "guys" for farmers to eat, and agricultural machinery is a good partner for farming, thanks to strong and powerful agricultural machinery, autumn harvest and autumn planting are in full swing. Traditional agricultural machinery coating coatings are mainly quick-drying solvent-based coatings, which have weak protection and large environmental pollution. Driven by policy, agricultural machinery coating ushered in a critical opportunity for upgrading, and the general trend of "paint to powder" is inevitable. To meet the needs of green environmental protection, while taking into account both decorative and protective aspects of WANAN construction machinery powder coating came into being, helping the high-quality development of agricultural mechanization.     Abrasion and scratch resistant   The harsh field environment requires agricultural machinery to have excellent wear and scratch resistance, including coating flexibility, hardness, adhesion and impact resistance.   Tested by the paint film flexibility tester (testing method: GB/T 1731), the coating of WANAN construction machinery powder coating is deformed with the substrate and will not crack and peel off (shaft rod diameter: 3mm), and when the agricultural machinery is subjected to external impact, the better coating toughness can play a buffering role and achieve better protection effect. The coating surface hardness of WANAN Construction Machinery Powder Coating ≥ H grade, and the impact resistance is excellent, and after repeated impact tests, the test sample did not produce any cracks, wrinkles and coating peeling. In the process of practical application, it can effectively reduce the wear and tear consumption of the appearance of agricultural machinery products and prolong the service life of products.     Anti-corrosion and weather resistance   Climate, water and soil, fertilizers, pesticides, etc., are all "chronic killers" that threaten the life of agricultural machinery coatings, and whether they can resist corrosion day after day is an important factor to distinguish the excellent protective performance of the coating from the general quality.     Tested and certified by a third-party authority, the coating of WANAN Construction Machinery Powder Coating has stable performance in many aspects such as damp heat resistance, salt spray resistance, acid and alkali resistance, and aging resistance, and will not cause loss of light and discoloration, blistering, wrinkling and coating peeling, effectively reducing potential safety hazards caused by oxidation and corrosion, and ensuring the stable operation of agricultural machinery and equipment.   Environmentally friendly and efficient   On December 27, 2022, the Ministry of Agriculture and Rural Affairs issued the "14th Five-Year Plan for the Development of National Agricultural Mechanization", which clearly pointed out that it will accelerate the promotion of intelligent and green agricultural mechanization and promote energy conservation and emission reduction of agricultural machinery. The national environmental protection policy involves all aspects, and the "paint to powder" in the field of construction machinery coating has become the general trend. Driven by the policy, the "4E" type (high efficiency, energy saving, environmental protection, economy), non-toxic, solvent-free, and non-VOC pollution WANAN construction machinery powder coating stands out. Compared with traditional solvent-based coatings, WANAN Construction Machinery powder coatings are sprayed and molded at one time, with a high degree of automation, and the electrostatic spraying process of powder coatings can effectively solve the coating needs of corners, holes and welds, improve coating efficiency and achieve better corner coverage, and contribute to efficiency and cost saving and environmental protection.   The painting is beautiful   For the fierce powder coating market, it is not enough to meet the basic needs of performance, quality, environmental protection, etc., but also to meet the higher level of aesthetic needs. Excellent appearance design is one of the key factors to enhance product image, attract potential customers and improve the overall competitiveness of the market.   WANAN Group can tailor construction machinery powder coatings with rich colors, gloss and texture according to the different needs of customers for coating surfaces, which are widely used in construction machinery parts such as cabs, hoods, ladders, benches, etc., to meet diversified design styles and provide more possibilities for the appearance design of agricultural machinery and equipment.

The Mid-Autumn Festival is approaching, and the moon is gradually full. Family reunion is the eternal expectation of every Chinese son. We come from all over the world, and in our work, we have become partners together because of our common dreams; In life, because of mutual care, we become relatives who support each other. Love is an invisible bond that connects family members, and reunion is never confined to a formality. As long as there is love, there is a home, and the heart is together, it is a reunion. WANAN Group is willing to create a big family full of warmth and care for every Wanan family. On September 14, 2024, it is another festive year to come, and Wan'an's family gathers together to go to the Mid-Autumn Festival:  At Wan'an, we advocate finding value in unremitting struggle, and at the same time encourage all Wan'an family members to embrace the beauty of life. During the Mid-Autumn Festival happy hour, we used the fun games as a link to make the WANAN team closely connected in laughter and collaboration. From the tacit cooperation of the beads, to the joyful walk of the two and three, to the unity during the tug-of-war, we all feel the warmth and strength of the Wanan family. In the face of challenges, we work hand in hand; When we succeed, we share the joy. In a relaxed and happy atmosphere, further enhance cohesion and improve team combat effectiveness. At the end of the event, the Wanan family used a festive red envelope with warm blessings to convey sincere thanks and blessings. This is not only a recognition and affirmation of the hard work of all Wanan people, but also a beautiful expectation for the future to go hand in hand and create brilliance together. WANAN Group firmly believes that the relationship between enterprises and employees is one of mutual achievement, co-prosperity and symbiosis. In the days to come, we will continue to move forward hand in hand and write a more brilliant chapter in mutual support and common growth.

Powder coatings have changed dramatically over the years, changing the way surfaces are handled across industries. It's crucial to explore the latest developments in powder coating technology and how these advancements can extend their applications to various industries. The purpose of this article is to delve into the innovative advancements in powder coatings, shedding light on new formulations, application technologies, and the scope for this versatile finishing method to flourish. Powder coating is a dry finishing process that involves applying finely ground pigments and resin particles to a surface. These coatings are electrostatically charged, ensuring uniform application. The coated object is then cured in an oven, where the powder melts and fuses into a smooth, durable, and protective coating. Environmentally friendly Powder coatings are recognized for their environmental benefits. Unlike traditional liquid coatings, powder coatings emit negligible amounts of volatile organic compounds (VOCs) that contribute to a cleaner, safer work environment. Powder coatings are solvent-free, so they don't require expensive contamination control equipment, making them a more sustainable option. Durability and resistance Powder coatings provide a strong and resilient coating that is resistant to chipping, scratching, and fading. This durability makes it ideal for a variety of industries where coated objects are used in harsh conditions. Cost-effective Powder coating processes are generally more cost-effective than traditional liquid coating methods. Reducing waste, speeding up production cycles, and reducing energy consumption are the economic appeals of powder coatings. The latest developments in powder coating technology   Nanotechnology integration One of the most important advances in powder coating is the convergence of nanotechnology. Nanoparticles are typically made from materials such as silica or zinc oxide that enhance the properties of the coating, including hardness, scratch resistance, and UV stability. Nanotechnology has also facilitated the development of self-healing coatings that can repair minor damage over time, extending the life of the finished product. Functional coatings Powder coating is no longer limited to providing aesthetically pleasing enhancements. Recent developments have led to the creation of functional coatings with specific properties tailored to unique applications. Antimicrobial powder coatings are becoming increasingly popular in healthcare settings, where it is critical to maintain a sterile environment. These coatings inhibit the growth of bacteria and other microorganisms on the surface of the coating. Smart coatings improve performance The inclusion of smart coatings in powder formulations is a breakthrough development. These coatings can respond to external stimuli, such as temperature changes or light, providing adaptive functionality. Smart coatings can be applied in various industries, such as automotive, to help improve fuel efficiency and reduce maintenance costs. The range of applications for powder coatings is constantly expanding Automotive industry The automotive industry has long been a beneficiary of powder coatings. Advances in powder coating technology have driven the development of high-performance coatings that offer excellent corrosion resistance and enhanced aesthetics. Powder coatings are widely used to coat automotive parts such as wheels, chassis, and engine parts. Building and construction industry Powder coatings are preferred by the building and construction industry due to their durability and versatility. Available in a wide range of colors and finishes, it is suitable for painting facades, window frames, and other architectural elements. Recent developments in powder coating formulations have introduced weather-resistant and anti-graffiti coatings, expanding the range of applications in this area. Electronics and appliances Powder coatings are widely used in the electronics and home appliance industries to coat products such as household appliances, electronics housings and components. The insulating properties of powder coatings make them ideal for electrical applications. The continuous development of conductive powder coatings has opened up new possibilities in the field of electronic devices, providing a fusion of protection and functionality.  furniture and decorations  Powder coatings have revolutionized the furniture and décor industry, offering an alternative to traditional painting methods. Powder coatings are a popular choice for furniture and decorative items due to their ability to produce textured finishes, metallic effects, and vibrant colors. In the current global context where hygiene is a top priority, the introduction of antimicrobial powder coatings is particularly important. Aerospace & Defense The aerospace and defense sector requires coatings that can withstand extreme conditions, including high temperatures and corrosive environments. Powder coatings provide a uniform and durable surface and are used in aircraft components, military equipment, and aerospace structures. Future Trends and Prospects Sustainably formulated The push for sustainability is influencing the development of eco-friendly powder coating formulations. Researchers are exploring bio-based resins and pigments to reduce the environmental impact of powder coating processes. 3D printing is integrated with powder coating The combination of 3D printing and powder coating is an emerging trend. This combination can create intricate and customized items with the added benefit of a durable powder coating finish. Advances in application technology Ongoing research is focused on improving the efficiency of powder coating application technologies. This includes the development of automated application systems, electrostatic spraying technology, and precision spraying robotics. Healthcare applications The healthcare industry is increasingly interested in powder coatings for medical devices and devices. Powder coatings are suitable for a wide range of healthcare applications due to their antimicrobial properties and ability to withstand rigorous cleaning procedures.

In today's fast-changing world, the rise of new productivity is reshaping industries like never before, and the coatings industry is no exception. In the face of profound changes in the real estate market, the dynamic adjustment of small B-end and large B-end customers, as well as the trend of increasingly diversified and personalized consumer demand, coupled with the challenge of "price war" intensified by the industry, China's coating enterprises are standing at a critical crossroads, and urgently need to find a way to break the situation and realize the gorgeous turn from "large industry and small enterprises" to "large and strong". Embrace change and innovation drives development First of all, in the face of fierce market competition, coating companies must have the courage to embrace change and regard independent innovation as the core driving force of enterprise development. In the manufacturing process, enterprises should take the initiative to seek changes and devote themselves to high-end breakthroughs in product research and development. This requires enterprises to increase R&D investment, introduce or cultivate top scientific research talents, focus on the research and development of new materials, new technologies and new processes, and continuously launch coating products that meet market demand and have differentiated competitive advantages. At the same time, the intelligent and green transformation of production equipment is carried out to improve production efficiency and product quality, break the shackles of traditional production models, and lead the industry to high-end and intelligent. Channel innovation to expand the blue ocean of the market Secondly, in terms of channel mode, coating companies need to keep up with the pace of the times and actively explore new market entry paths. With the popularization of the Internet and the rise of e-commerce, online sales channels have become an important force that cannot be ignored. Enterprises should make full use of digital tools such as e-commerce platforms and social media to build an omni-channel marketing system that integrates online and offline to achieve precision marketing and efficient reach. In addition, it is also necessary to maintain a keen insight into new areas of coatings, such as new energy vehicles, green buildings, smart homes and other emerging fields, where the demand for high-performance and environmentally friendly coatings is growing, providing a broad space for the development of coating companies. By laying out in advance and seizing market opportunities, enterprises can achieve rapid growth in the new market blue ocean. Global vision, layout for the future Finally, in the face of the tide of globalization, China's coating enterprises should establish an international strategic thinking and prepare for the global layout. This includes strengthening exchanges and cooperation with international counterparts, introducing advanced management experience and technological achievements; Actively participate in the formulation and revision of international standards to enhance the international competitiveness of China's coating products; At the same time, through the construction of overseas factories, the establishment of R&D centers, etc., directly participate in the international market competition, expand brand influence and market share. On the stage of globalization, show the demeanor and strength of Chinese paint enterprises. In short, in the context of new quality productivity, China's coating enterprises must have the courage to embrace change, adhere to innovation-driven, expand the market blue ocean and have a global vision in order to achieve leapfrog development from "large industry and small enterprises" to "large and strong". Only in this way can we be invincible in the fierce market competition and lead the coating industry to a more brilliant future.  

As the core power source of new energy vehicles, the insulation performance of power batteries decreases, which may lead to short circuits in batteries, cause vehicle failures, increase the risk of electric shock, and pose a serious safety threat to drivers and passengers. Frequent insulation failures will undoubtedly reduce consumers' trust in new energy vehicle brands, which in turn will damage brand image and market competitiveness. Doing a good job in the insulation design of power batteries has become the key to ensuring the safety of drivers and passengers, maintaining the stable operation of vehicles, extending the service life of batteries and enhancing the brand image of automobiles.   Through strict experimental tests, it is proved that the coating volume insulation resistance of WANAN insulating powder coating reaches more than 1*1016Ω·m, the dielectric strength > 40KV/mm, and the insulation withstand voltage of the coating reaches more than 3800V (the above experimental results are based on the physical and chemical test of 0.8mm thick 3003 aluminum plate and film thickness 200±50μm, and the actual performance of the product is slightly different due to different application environments). It can provide stable and reliable insulation protection for new energy vehicle battery packs and other parts, effectively isolate the current, protect the personal safety of drivers and passengers, and ensure that new energy vehicles can operate for a long-term, stable and safe time in a complex and changeable environment.   With the significant increase in the range of new energy vehicles, the number of battery packs in series has also increased, resulting in a significant reduction in the spacing between the cells, which has exacerbated the risk of thermal runaway in the event of abnormal conditions such as short circuits and collisions. Once the battery thermal runaway leads to a fire, its high energy density often leads to the fire is difficult to control, which is one of the main culprits causing new energy vehicle safety accidents. Strengthening the fire safety design of battery packs to prevent and reduce the serious consequences caused by thermal runaway is the key link to ensure the safety of new energy vehicles.   WANAN insulating powder coatings are halogen-free (e.g. bromine, chlorine), halogen-free flame retardant, exhibit excellent environmental friendliness during production, use and handling, and meet the UL94 V-0 flame retardant standard while reducing potential harm to the ecosystem, i.e. the flame can be extinguished in a very short time (within 10 seconds) after two combustion tests on the sample. In practical application scenarios, it can effectively slow down the spread of fire, maximize the valuable escape time for drivers and passengers, and maximize the safety of life and property.   In the complex and changeable driving environment, the battery pack of new energy vehicles has to withstand multiple challenges such as high temperature, oxidation, and sediment erosion. The surface material of the battery pack must have excellent weather resistance, scratch resistance and impact resistance. It is very important to do a good job in the surface wear protection of the battery pack of new energy vehicles, which can effectively resist physical impact, moisture invasion and chemical corrosion during driving, prolong the battery life, and ensure the overall safety performance of the vehicle, thereby enhancing consumer confidence and promoting the popularization and application of new energy vehicles.   Through repeated tests on the hardness, adhesion and impact resistance of the WANAN insulating powder coating model, it has been proved that the impact strength of VIE insulating powder coating is ≥ 50 kg·cm, and the adhesion of the coating meets the level 0 adhesion (IOS standard assessment is divided into 0-5 grades, of which grade 0 is the best and grade 5 is the secondary), which can effectively avoid potential safety hazards caused by the aging of battery pack parts and external collisions of new energy vehicles. The 1000h constant damp heat test proves that the coating of WANAN insulating powder coating has excellent water resistance, damp heat resistance, and the tested coating has no cracking, falling off, blistering and discoloration, and the coating can still meet the requirements of insulation and withstand voltage after wiping, which fully proves the reliability of WANAN insulating powder coating in complex and changeable use scenarios, and minimizes the degradation of vehicle performance and shortening of life caused by external factors.   With the vigorous development of new material technology, WANAN insulating powder coatings keep up with market demand, and strive to achieve better decorative effects and better protective properties. We have always been committed to providing customers with one-stop coating solutions and continuing to create maximum value for customers. In the pursuit of speed and passion at the same time, let every trip worry-free, for the popularization and development of new energy vehicles to contribute more WANAN strength.

Love is the eternal theme of the Qixi Festival, and we will be willing to do a lot of hard work in order to stay with our beloved. It is precisely after the hardships and dangers of thousands of rivers and mountains that there is the preciousness of "when the golden wind and jade dew meet, they will win countless in the world".   This perseverance and efforts are not only reflected in the emotional world between people, but also reflected in the daily practice of Wanan Group's pursuit of excellence and excellence: "Meeting" is a magical fate, and it is also the beginning of all good things. When Wanan powder coating meets various substrates, it is like finding a tacit soul mate.     It puts on a splendid coat for metal profiles, wood, glass, ceramics and other substrates, with delicate and soft texture and luster changes, and all kinds of substrates together present a brilliant visual effect of 1+1>2, so that every "encounter" has become an irreproducible beautiful prologue in life. The wide range of applicable substrates has pushed the application field of Wanan powder coating to a broader world. The coated decorative surface fully meets the needs of many industries such as building materials, furniture, electrical appliances, electronics, construction machinery, automobiles, general industry, etc., so that every encounter becomes a new starting point for a beautiful encounter. The "two loves" of Wanan powder coating and color make the paint color burst out with strong vitality. The tranquility and healing of cool tones, the stability and harmony of neutral tones, the warmth and vitality of warm tones...... Each color symbolizes a different emotional symbol, bringing us different emotional experiences and painting the infinite possibilities of a better life. Heartbeat is rare, and even rarer is that after the first sight, it is still a long time ago. The days will go on and on, but the coating of VIE powder coatings will "last forever".     With excellent color retention, adhesion, weather resistance and other protective properties, the coating of Wanan powder coating has passed the Qualicoat level 1 and level 2 certification, which is not afraid of the test of wind, sun and rain, and can withstand the erosion of time minute by minute, so that the coating substrate can maintain the original color and texture for a long time, and make the beauty shine in the long river of time with a firm commitment that will last forever.   In every day from spring to autumn, Wanan Group has always adhered to its original intention and operated in a green and sustainable manner.   From raw materials to production management, the group is strictly controlled, through the environmental management system (ISO14001), occupational health and safety management system (ISO45001), quality management system (ISO9001) and other environmental protection system certification, the production of thermosetting powder coatings with zero formaldehyde pollution, zero mildew prevention, zero VOCs pollution, antibacterial, antiviral, non-toxic, solvent pollution and other environmental protection characteristics, compared with traditional coatings, carbon footprint reduced by > 60%.   We always present consumers with high-quality products that are healthy, environmentally friendly, and quality-oriented, so that every choice becomes Wanan's firm commitment to a healthy life, while creating value for customers and creating social wealth, it also carries the original intention of Wanan people's green environmental protection. Companionship is the most affectionate confession. Just like the firmness and perseverance in love, no matter how the years change and how the market environment changes, Wanan has always been customer-centric and market-oriented, and is committed to providing customers with one-stop coating solutions and continuing to create maximum value for customers. This persistence and commitment, rooted in every daily moment of Wanan, has become an inexhaustible driving force to support us to move forward.   Wanan has always practiced the corporate values of "people-oriented, customer-oriented, accurate and realistic, honest and honest" with practical actions, and extended the most affectionate "confession" to customers, markets and industries with excellent product quality, strict technical standards and thoughtful corporate services. Beginning with meeting, falling into beauty, and finally long-term love. Wanan Group colors romance, adds color to beauty, and lets "love" infiltrate every spring and autumn day, and wishes that there are lovers in the world who will eventually become married.  

In today's world of advocating individuality and pursuing quality, we are no longer satisfied with the same aesthetics, but focus on the subtleties to find the bright light that highlights the individuality.   There is a kind of beauty called "born to shine". It is not only a visual feast, but also a deep yearning for the extraordinary.   Wanan Metallic Powder Coatings are a great interpretation of "born to shine". It is not only the art of decoration, but also the manifestation of life attitude and taste, with light as the pen, color as the ink, delicately outline each extraordinary brilliance, and add endless overflowing color to life.   In the art world of Wanan Metal Powder Coating, beauty is given infinite possibilities and shines more than once.     The innovative all-bonded process technology is like a "magic pen" to unlock the metallic luster, which makes a further breakthrough in the content of metallic pigments - up to 20% of metallic effect pigments such as aluminum powder and pearlescent powder in the formula, which can easily unlock the shining "filter" of life.   The cyclone separation test shows that the loss of Wanan Bonding metal powder is less during the spraying process, and it is easy to obtain a uniform metallic luster on the surface.   Each of these tiny, brilliant ultra-fine metal particles resembles finely carved miniature gemstones, delicately refracting dazzling light.     Whether it is sunlight, light or even soft natural light, every interplay of light and shadow can make the coating of VIE metal powder coating shine with sparkling and moving brilliance, with a 360° high flash visual effect, bringing a colorful visual feast to the surface of the profile.   If paint is the art of color, then color is the soul of paint. Wanan Metallic Powder Paint is inked with delicate and rich colors to paint a colorful picture of life.   From calm and introverted to warm and public, from fresh and elegant to exquisite luxury, every color choice is an interpretation of life attitude.   The shimmering textured luster of Wanan Metallic Powder Coatings collides with the vast expanse of colour inspiration, bringing infinite possibilities to life, making every moment of ordinary life shine with extraordinary light. There is a kind of beauty called "born to shine". Every flickering light is the interweaving of light, shadow and color, and every eye-catching highlight moment comes from the continuous self-polishing of Wanan metal powder coating, and every extraordinary brilliance is the highest respect for a better life of Wanan Group.

With the increasing attention and attention of the state and society to the environment, the national air control and prevention plan and the local air VOC emission limits have been introduced, which strictly restricts the emission of three wastes in the automobile coating industry. The comprehensive performance of powder coating is higher than that of paint, and it has become the mainstream to replace liquid coating. Adhesion is an important technical index related to the mechanical properties, corrosion resistance and weather resistance of coatings. Based on the characteristics of the cabin itself and its coating process, powder coatings differ from traditional paints in controlling the adhesion of coatings. In this paper, the situation of powder coating technology promoted by automobile interior coating line is introduced, the factors affecting adhesion are discussed in detail, and the control methods and improvement measures are proposed. 1. Characteristics of the carriage coating process The process of powder coating process for automobile compartment is as follows: the upper part is → wiped→ degreased→ washed with water→ surface adjustment→ phosphating → washed with water→ pure water washing→ electrophoresis→ UF (ultrafiltrate) cleaning→ pure water washing→ electrophoresis drying→ grinding and wiping→ gluing → wiping before powder spraying→ powder spraying→ drying → inspection→ fine → repair → the next parts.      Table 1 compares the painting process of the carriage with other products, such as frames and appliances. It can be seen that compared with other workpieces, the process of powder coating of the carriage is the most complete. In the "composite coating" process, which is a "multi-process" process, it is necessary to ensure a balance of adhesion between each coating, taking into account the compatibility between each process. 2. Factors affecting the adhesion of powder coating  The powder coating is solvent-free and bakes directly into a film in an "all-solids" state. Compared with liquid coatings, the liquid wetting time is shorter in the film-forming process, the baking time in the glue state is longer, the baking temperature is higher, the coating is thicker, and the dry film cohesion is greater.   According to GB/T9286–1998 "Scratch Test of Pigment and Varnish Paint Film", the adhesion of the coating after each process was checked in the laboratory to investigate the influence of each process on the adhesion.  2.1 Pre-treatment process    2.1.1 Wipe clean   The surface condition of the steel plate affects the adhesion. The oxide film on the surface of the cabin substrate has a weak bond with the metal, which makes the subsequent coating easy to stick off and peel off. Therefore, the workpiece needs to be polished by manual grinding to wipe the oxide scale or shot blasting before painting.   2.1.2 Degreasing    The surface tension of oil stains is low, and its adhesion to metals and coatings is very weak, which has a great impact on adhesion. The degreasing process mainly includes pre-degreasing, degreasing, etc., and the low concentration of the liquid medicine, the pH change, the process temperature is not up to standard, and the treatment time is too short. In addition, the anti-rust oil on some plates is particularly difficult to remove, so it is necessary to verify before choosing anti-rust oil, and qualified oil can be used.    2.1.3 Tone      Abnormal surface conditioning process parameters will lead to large crystalline particles and loose film layers, which will seriously affect the adhesion of powder coating.    2.1.4 Phosphating    The phosphating process is an important factor affecting adhesion, and its control parameters include total acidity, free acidity, accelerator concentration, bath temperature, phosphating time, etc. The workpiece of the carriage is generally phosphated by ternary zinc, and the temperature is usually controlled at 40~55 °C, and the time is 2~3min.   When the parameters change, such as the temperature of the bath liquid is too high, the phosphating reaction is violent, the effective ion content will be lost, resulting in irregular crystallization and even secondary crystallization, and the obtained phosphate film particles are seriously large, sparse and not dense, and finally the adhesion between the phosphate film and the substrate will decrease. Spraying powder coating or electrophoretic coating (i.e., single coating process) directly on the phosphate film generally has a wide range of requirements for phosphating quality, the crystal particle size of the phosphate film is 5~25μm, and the adhesion of the coating film can be guaranteed when the film thickness is 1~10μm.   However, when examining the adhesion of different supporting systems (see Table 2), it was found that the adhesion of the "electrophoresis + powder coating" system was unqualified when the phosphate film thickness was about 9 μm. The test proves that the system has stricter requirements for the thickness and crystallization state of the phosphate film, and the adhesion of the final product can only be guaranteed when the crystalline particle size is 5~10μm and the film thickness is 1~3μm.   2.2 Electrophoresis  2.2.1 Compatibility between electrophoretic paint and powder coating  Electrophoretic paint can be divided into standard type and weather-resistant type according to the weather resistance level. Standard electrophoretic paints are usually based on epoxy resin with good corrosion resistance, and its free polar groups can react with the powder coating to form chemical bonds, so there is good adhesion between the two. The resin of weather-resistant electrophoretic paint is mainly composed of epoxy, polyester and acrylic resin, because the surface tension is different, the resin with large surface tension sinks in the lower layer during film formation, and the acrylic resin with low surface tension floats on the surface, and there is no active group to cross-link with the powder coating of the upper layer, so the adhesion between the two is poor. Before selecting a weather-resistant electrophoretic paint, it is necessary to verify the compatibility with the powder coating.    2.2.2 High temperature resistance of electrophoretic paint    The drying conditions of powder coating are (180~190)°C×20min, while the drying conditions of electrophoretic coating are usually (160~170)°C×20min, if it is baked at (180~190)°C×20min, it may be over-dried, and there is a risk of poor adhesion to powder coating.   Therefore, it is necessary to verify the high temperature baking resistance of the electrophoretic coating to ensure that it performs well at 190°C×60min, and the adhesion to the powder coating is still grade 0 after drying.   2.2.3 Drying conditions of electrophoretic paint    The adhesion of the powder coating to the electrophoretic coating is stronger than that obtained by the pretreatment, and once the electrophoresis layer is not dried enough, it is easy to engage with the upper coating, but when the drying time is set too long or the temperature is set too high, the electrophoretic paint will be over-cured, and the surface tension will increase, resulting in the adhesion of the powder coating on the electrophoretic layer will decrease.     After online pretreatment and electrophoresis, the test plate is dried under different conditions, and the dryness is detected and then the on-line hanging plate is sprayed with powder, and the powder coating thickness is controlled to 100~120μm.   2.3 Powder coating  2.3.1 Powder coating process parameters  Using electrostatic spraying, the final process parameters used in the field are as follows: gun distance 20~40cm, voltage 50~80kV, current 10~40μA, powder output 100~300 g/min. After debugging multiple rounds of process parameters, it was found that the construction parameters only affected the utilization rate of the paint and the one-time powder rate, but did not affect the adhesion.   2.3.2 Selection of powder coatings      Although powder coating has been maturely used in home appliances, auto parts and other fields for many years, due to the particularity of the cabin coating, the powder coating used is self-contained, which has higher requirements than other industries.   2.3.3 Powder coated film thickness    When the coating is formed on a rigid substrate, it can counteract adhesion due to the internal stress caused by the inability to shrink, and only a small external force is required to break the bond. If the film layer is too thick, the internal shrinkage force will have a strong peeling effect on the lower coating, which will affect the adhesion between the coatings and the substrate.   When the powder coating model remains the same, the thicker the film layer, the greater the internal stress, and the worse the adhesion. As a rule of thumb, the powder coating thickness is controlled below 160 μm, and the adhesion can be stabilized at class 0. And the car compartment mostly adopts corrugated plate, there are more concave and convex surfaces, and the thickness distribution of powder coating is uneven, so it is recommended to control the film thickness of the concave surface to meet the requirements of low engineering covering power, generally 70~80μm; The convex surface is closer to the powder spraying gun, and the powder amount will be higher, and the film thickness can generally reach 120~130μm.   2.3.4 Factors influencing the curing of powder coatings     Insufficient curing time and drying temperature will cause the coating to become more brittle, which will peel off when the adhesion is tested. Therefore, in order to ensure that the adhesion of the coating meets the standard, it is necessary to track and monitor the furnace temperature curve at the production site and check the adhesion at this temperature.   2.4 Key points of production control of powder coating line 2.4.1 Pretreatment line groove fluid    The production site needs to monitor the bath parameters once per shift to monitor the debinding status, temperature, degreasing alkalinity, phosphating parameters, and ion content in the phosphating solution. At the same time, the pretreatment material manufacturers are required to provide on-site services and provide weekly reports on ion content testing.   2.4.2 Electrophoresis drying state    Check whether the electrophoresis oven and conveyor equipment are in line with the process status every day, and regularly wipe with absorbent cotton dipped in acetone to test the dryness of the electrophoretic paint film. During the process debugging and trial production, the first article is used with a breadboard every day to check the adhesion of the electrophoresis layer and powder coating, and then produce after passing the test. After stabilization, it can be changed to random baffle detection.    2.4.3 Furnace temperature   Once a week, the furnace temperature curve of the electrophoresis and powder drying furnace is checked by a furnace temperature tracker, and the adhesion of the coating at this temperature is tested.    2.5 Solutions to powder coating adhesion problems at the production site   After the powder production line is put into use, under the condition that the coating is well matched and the equipment status meets the process requirements, once there is a problem of poor adhesion, the cause of the problem can be quickly determined and solved by the following methods on site.   2.5.1 Powder anomalies    The powder is sprayed directly on the standard pretreatment plate and baked in a small laboratory oven to determine whether the powder is abnormal.   2.5.2 Pretreatment and electrophoresis abnormalities    Pretreatment fluids and electrophoretic paints are provided by different suppliers, and it is difficult to immediately determine the source of the problem if there is an abnormality in production. The "standard phosphating plate" can be used in commissioning production, which can be directly electrophoresed and then sprayed with powder coating, and then the adhesion can be evaluated.   If it is qualified, it means that there is an abnormality in the pretreatment process, and if it is not, it is the electrophoresis process. The method is simple, fast, effective, and reproducible, which can effectively troubleshoot problems and ensure mass production schedule.   2.5.3 Selection of detection tools      Replacing the scratching knife with a utility knife, stabilizing the utility knife with a steel ruler, and using a "test tape" such as 3M's Scotch4-1000 can effectively improve the accuracy of adhesion testing.   3. Conclusion      In order to ensure the quality of the final coating, this paper investigates the influence of each process on adhesion according to the process flow, and gives the control points and solutions, which provides a certain reference for other factories to promote this process.

The classic "summer pairing" of barbecue and cold drink makes us feel the beauty and fireworks of life.   A well-designed barbecue is not only a powerful tool for cooking delicious food, but also the key to enhancing the quality and atmosphere of this summer feast.   If you want to do a good job, you must first sharpen your tools. Wan'an oven uses high-temperature resistant powder coating, with every place to pay attention to, to achieve every gathering, fearless summer flames, and to break into the sweet and sour food rivers and lakes.     During the operation of the oven, its internal temperature rises sharply. Without the protection of the temperature-resistant coating, the oven substrate will be directly exposed to open flames and high temperatures, causing irreversible damage such as softening and deformation of the material, and making the carefully prepared summer feast of the tongue come to naught in an instant.   In response to the demand for coating the parts of the oven that are in direct contact with the open flame, WANAN has devoted itself to research and development, and has launched high-performance high-temperature powder coatings for ovens that are both temperature-resistant and scratch-resistant. After pretreatment such as iron phosphating and sandblasting on the surface of the oven product, the cured coating can stably withstand the temperature resistance of 200-500°C.   Even if it is exposed to extreme conditions such as high temperature open flame and frequent physical friction for a long time, the coating of WANAN oven high-temperature powder coating can still maintain its original luster, and will not lose its color and the coating will not fall off.     When cooking food, the inner cavity of the oven will be directly exposed to steam, oil and salt infiltration and high temperature open flame, and the safety and durability of its coating materials are directly related to food safety and the stability of the oven.   The coating of high-temperature resistant powder coating for Wan'an oven has dense coating, high adhesion, excellent stain resistance and easy cleaning ability, and can form an anti-corrosion and wear-resistant protective "barrier" on the surface of the oven product.     In the harsh neutral salt spray test environment, WANAN high-temperature resistant powder coating (taking 300°C series products as an example) can easily pass 1000 hours of continuous testing, and the unilateral corrosion width is controlled within 2mm, which ensures that the product can effectively resist the erosion of oil, salt, water, acid, alkali and other substances in practical applications, and can keep the surface of the oven smooth and clean even in the face of long-term cooking challenges, so that delicious and safe coexist, and let joy and health go hand in hand.     With the leap in people's quality of life and the emphasis on leisure and entertainment activities, the oven is not only a cooking tool, but also a display of atmosphere creation elements and personal life taste in barbecue parties, outdoor gatherings, and festival celebrations.   With a variety of colors, delicate textures, and rich gloss, WANAN high-temperature powder coatings for ovens can better meet the needs and aesthetic preferences of different user groups, and achieve the perfect combination of function and aesthetics.   Compared with the traditional coating process, powder coating can achieve several or even more than a dozen coating effects of traditional paint at one spraying, and 360° spraying molding without dead angles can meet complex shapes such as planes and curved surfaces, providing a higher degree of design freedom for oven product design. The exquisite oven and the delicious food complement each other, making every cooking and tasting a feast for the eyes and the palate.     In 2019, WANAN launched the research of high-temperature resistant powder coating project and achieved a series of results, including 1 new new high-temperature and strong weather-resistant powder coating product, 3 national authorized invention patents, and 1 group standard.   The Zhongguancun Materials Testing Technology Alliance (CSTM) group standard T/CSTM 00640-2022 "High Temperature Powder Coatings for Ovens" led by WANAN Group was officially released on August 29, 2022 and implemented on November 29, 2022. Through the formulation and implementation of this standard, WANAN Group has broken the monopoly of foreign companies on domestic high-temperature powder coatings, and opened up a new track for domestic high-temperature powder coating production.   In this hot summer, you can't get a cold drink without a barbecue around the oven, and you can't have two meals......   WANNAN Group has always been committed to providing customers with one-stop solutions, continuing to create maximum value for customers, and achieving every summer trip with every hot and cool intertwined taste.

Introduction With the advent of summer, powder agglomeration is a headache for the majority of manufacturers, in addition to the process problems in the production process, storage and transportation are also factors that affect the final spraying effect. In summer, the temperature is high and the humidity is high, and the temperature and humidity can directly affect the final coating quality of the powder coating.   Many customers have high requirements for the utilization rate of powder, and the powder loading rate is the most specific manifestation of the utilization rate. There are many factors that affect the powder loading rate, such as resin content, particle size, fluidity, resin type and so on.One of the most important factors affecting the powder loading rate is the electrification of powder coatings.    This kind of problem is a system engineering integrating materials, formula design, and application, and each manufacturer also has different ways to solve it, so we will not discuss it for the time being. Today, I would like to recommend an additive for you, which can greatly improve this kind of problem.   【Hydrophobic type】fumed nano alumina Alu C-S Alu C-S is a nano-alumina that has been hydrophobically modified on the surface. It has finer particles, better flowability, and better compatibility with resins. When applied to medium and high-grade powder coatings, it can achieve a comprehensive improvement of fluidity and electrostatic spraying performance, and play a role in preventing agglomeration.   The role of fumed alumina in powder coatings 1. Anti-caking: nano-level (13 nanometer native particle size) powder and unique structure and chargeability can prevent caking.   2. Improve fluidity: due to the unique positive charge characteristics and unique structure, it plays a good role in fluidity.   3. Improve wear resistance: Alumina has a high hardness and can play a good wear resistance effect.   4. Improve the powder loading rate: the positive charge of fumed alumina makes it an effective additive for the formulation of frictional charged powder coatings. Whether it's epoxy polyester blends, polyester-TGIC or other resin systems, fumed alumina offers an excellent combination of fluidity and electrical charge in friction coating applications;   5. Improve the compactness of the coating.    The fluidity of the positive charge of fumed alumina in powder coatings and the mechanism of improving the upper fraction Powder aggregation is the result of the internal structural forces of the material competing with the gravitational forces on the particles in a variety of ways, depending on particle size, humidity and particle composition.   In general, when the size of the dry particles is greater than 75um, the gravity force is greater than the structure or the inter-particle force, the gravitational force between the particles is small, the powder can be fluidized, and only a small amount of energy is needed to flow, and the particles can move independently of each other. However, when the particles are large, the appearance quality of the coating film decreases, and the orange peel is also more serious, and the quality of the sprayed surface is reduced.   When the powder particles are less than 75um, the gravitational force between the particles is often greater than the gravity of the particles, and the powder is easy to agglomerate, resulting in a decrease in fluidity.   At present, the powder coating particles are basically about 35um, and the future development trend is to further control the size of the powder particles between 10~20um to obtain a thinner coating by reducing the size of the matrix particles.   In order to overcome the agglomeration between powders, it is necessary to add nanomaterials such as fumed alumina to play a role in promoting fluidity. An appropriate amount of alumina powder is added to the powder coating, and through sufficient mechanical stirring, the alumina nanoparticles can be orderly combined on the surface of the matrix particles to form a layer of "coating".   In this way, a "shell core" structure is formed, and the whole movement can effectively reduce the electrostatic attraction between the particles, and avoid powder adhesion due to van der Waals force, moisture absorption, particle friction, etc.   Fluidization requires less energy, less sedimentation occurs during transport, powder fluidity is better, and powder fluffiness density increases.   If too much or too little alumina is added or due to insufficient stirring, then the nano alumina particles can not be evenly combined on the surface of the matrix particles, but randomly distributed between the matrix particles, and can not form an effective "coating" on the surface of the matrix particles, then the powder coating particles will also agglomerate, resulting in reduced fluidity, the matrix particles tend to agglomerate, fluidization requires more energy, and it is not convenient for construction spraying.   It is precisely because of the unique structure of fumed alumina and the appropriate size of the "agglomerate" particles and the electropositivity of the surface that it can form a coated "shell core" structure with the matrix particles of the powder coating, thereby effectively improving the fluidity of the powder coating, and also providing the possibility for further refinement of powder coating particles in the future, especially the ultra-fine powder coating currently appearing in the market, and the particle size of the product is even controlled to 0.1~0.2um.   The smaller the powder coating particles, the lower its heat capacity, and the less time required for melting, so that it can coalesce quickly to form a film and then level, the coating is dense, adhesion, impact strength and toughness are good, the corner coverage is high, and it has excellent chemical corrosion resistance and electrical insulation performance.   Generally, the amount of fumed alumina is 0.1%~0.3% of the total mass of powder coating, which can be mixed before and after crushing. If the addition amount is too much, the appearance and mechanical properties of the coating film will be affected, and the fluidization effect will not be obvious if the addition amount is too small. In addition, it is necessary to mix well when adding.   Special advantages of hydrophobic fumed alumina 1. It has all the advantages of hydrophilic alumina;   2. Due to hydrophobic treatment, the fluidity is greatly improved, and the anti-caking ability is greatly improved;   3. The charge is more stable, and its hydrophobic characteristics make it difficult for moisture in the air to enter and take away the charge;   4. It reduces the agglomeration of gas and aluminum itself, and greatly reduces the probability of white spots.

Thousands of high-rise buildings, focusing on the foundation, a journey of a thousand miles, starting with a single step. As the last process of automobile manufacturing, the painting process has a decisive impact on the quality of the whole vehicle. Especially for automobile wheels, the quality of coating directly affects the service life of automobile wheels, which is the key link to achieve the harmony and unity of automobile driving performance and design appearance. Wanan Group has been deeply involved in the field of powder coatings for more than 20 years, and has always been committed to providing high-quality and efficient coating solutions for the automotive industry, effectively protecting the wheel hub from the external environment, giving the vehicle a unique visual appeal, and making every painted car show extraordinary performance and charm.   The service life of each car is inseparable from the auto parts, and the quality of the vehicle wheel hub is related to the personal safety of every car owner.   Wanan Group has successfully passed the IATF 16949 automotive industry quality management system standard certification, with perfect control standards, marking that VIE Group's professionalism, standardization and effectiveness in automotive powder coatings have been recognized by the International Organization for Standardization.     In 2021, Wanan Testing Center officially obtained the CNAS Laboratory Accreditation Certificate, and in 2023, it passed the review and expanded the scope of testing, further consolidating the Group's technological leadership.   Wanan Testing Center continues to carry out rigorous product testing, and the powder coatings for VIE automotive produced by Wanan can well meet the coating needs of automotive wheels such as weather resistance, chemical resistance, scratch resistance, corrosion resistance, and impact resistance, escorting every safe trip.   As an integral part of the appearance of the car, the design style of the wheel hub directly affects the visual effect of the whole vehicle, and its design aesthetics is an important consideration in the decision-making process of consumers.   Aluminum profiles have strong plasticity and machinability, and can be processed into complex shapes such as planes and curved surfaces through extrusion, cutting, welding, etc., providing a higher degree of design freedom for modern wheel shapes.     Wanan Group has deeply researched the surface coating process of aluminum wheels, 360° spraying molding without dead angles, and provides complete and seamless decorative surfaces for various complex shapes of wheels.   Guided by customer needs, tailor-made with customized coating appearance, including color matching, gloss, texture and other special effects, allowing designers to achieve modeling creativity with higher design freedom and flexibility, and provide a more fashionable and beautiful appearance for the wheel.   With the continuous improvement of China's green development requirements, "paint to powder" is an inevitable trend. Energy conservation and emission reduction is the main theme of the long-term development of the automotive industry, and the Ministry of Industry and Information Technology issued the double integral management method in 2017 pointed out that lightweight is the best choice for automobile energy saving.   In the field of coating, powder coating is widely recognized by the market as "4E" environmentally friendly green coating because of its characteristics of no pollution, zero VOCs emission, high recycling rate, simple coating process and high automation. Not only can VOC emissions be reduced, but also the carbon footprint of the product life cycle can be reduced.   Compared with traditional automotive coatings, Wanan automotive powder coating is lighter and thinner in one spray molding, saving the amount of paint and spraying paint can be recycled, with a recovery rate of more than 99%, providing environmental protection coating for the automotive industry to reduce costs and increase efficiency.   Wanan Group will continue to uphold the persistent pursuit of quality, driven by innovation, and take environmental protection as the responsibility, to provide better coating solutions for the automotive industry, and continue to create maximum value for customers.   Great oaks from little acorns grow.. VIE has always walked with the market to provide a solid guarantee for safe travel every way.    

Process requirements for aluminum alloy materials in coating 1.1 Coating process   Aluminum alloy material coating is a systematic project, mainly including the surface treatment before coating, material coating and curing and leveling three basic processes, it is necessary to select the appropriate process conditions, ensure good working environment conditions and ensure quality supervision, technology in place, and consider the economy and other important links. The process flow is: washing→ degreasing→ washing→ washing→ pure water washing→ passivation treatment→ washing → washing→ pure water washing→ water drying→ hanging material → spraying→ curing → unloading → inspection packaging.   1.2 Pretreatment process   Surface pretreatment is the preparation work on the surface of aluminum alloy materials, to remove foreign objects (such as dust, oil, aluminum chips, etc.) on the surface of the material, to ensure that the resulting film layer has good adhesion, corrosion resistance, decoration, and to provide a good coating material suitable for coating requirements. The biggest advantage of this process is that it is environmentally friendly, free of polluting substances, and has high efficiency, low cost and stable quality of passivation layer. The pretreatment process index control is not up to standard or the operation is not standardized, which will cause many quality problems, and the more serious thing is that the adhesion of the coating is unqualified, and the surface paint film will gradually fall off after a period of use. There are five main causes of such defects.   1.2.1 Skim is not clean   Improper degreasing will lead to problems such as oil stains, too low etching amount or incomplete removal of the natural oxide film on the surface of the aluminum alloy material, which cannot be passivated normally. The experiment shows that the degreasing and dust removal are not clean, and the coating will fall off the surface after spraying.   1.2.2 Passivation cell Al3+ concentration   The effect of Al3+ concentration in the passivation tank on the adhesion of the coating to boiling water is shown in Figure 1. As can be seen from Figure 1, in order to ensure 100% compliance with the coating adhesion, the concentration of Al3+ in the passivation tank must be controlled within 0.2g/l. In order to better verify the results of this experiment, we conducted several strong impact tests in the laboratory. The results show that when the concentration of Al3+ in the passivation tank exceeds 0.2g/l (0.3~0.4g/l), the surface coating begins to fall off after the passivated aluminum matrix is coated and the impact resistance test is done, and the adhesion is unqualified. The crystalline phase observation of the passivated matrix with different Al3+ concentrations showed that the surface of the treated matrix showed a regular hexagonal structure and was dense at low concentrations. On the contrary, although it also has a hexagonal structure, it is sparse.   1.2.3 Conductivity and pH of the last pure water wash   The effect of the conductivity of the last pure water wash on the adhesion of the boiling water of the coating is shown in Figure 2, and the effect of the pH value of the last pure water wash on the adhesion of the boiling water of the coating is shown in Figure 3. As can be seen from Figure 2 and Figure 3, in order to ensure that the adhesion of the coating is 100% qualified, the conductivity of 9# pure water washing must be < 80μs/cm and the pH value must be > 4.5. In order to better verify the results of this experiment, we conducted several strong impact tests in the laboratory. The results show that after the last pure water washing with different conductivity and pH, the impact resistance test of the cleaned aluminum matrix is carried out, and the degree of peeling off of the surface coating is different, which verifies the accuracy of the results of this project.   1.2.4 Storage environment and storage time after passivation   Because the passivation film is thinner and the corrosion resistance is much lower than that of the hexavalent chromium passivation layer, it should be sprayed in time after passivation to prevent the passivation film from corroding caused by being placed in the plant. Especially in the case of small plant or poor ventilation, the corrosive gas in the plant will accelerate the corrosion of the passivation film. Practice shows that the passivated aluminum is best sprayed on duty, and the placement time under special circumstances cannot exceed 24 hours.   Problems that should be paid attention to in aluminum alloy coating   To meet the reasonable matching of various properties, it is necessary to adopt advanced forming technology, optimized pretreatment process and advanced extrusion process through reasonable composition design, including composition optimization and fine-tuning; The integration of many technologies such as reasonable structure, grain size, uniform distribution of the second phase and size control can produce automotive aluminum alloy materials with good performance. The development direction of aluminum alloy materials is mainly to improve strength, improve formability and reduce costs. conclusion   Through the research of this subject, we have mastered the common powder coating (including pretreatment) process technology of aluminum alloy materials, and improved it on the basis of traditional technology, which is more environmentally friendly, green, efficient and high-quality, and has a great role in promoting the research and development, promotion and product transformation of new aluminum alloy materials.