News

In the automotive manufacturing industry, painting is the final process on the production line. The coating of automobile parts is often narrowly understood as a beautiful exterior that just adds a decorative touch. But is the mission of painting merely a 'superficial task'? For Wanan Group, the answer to this question is a definite 'no.' Wanan Auto uses powder coatings not as a functional embellishment, but as a foundation of performance. We reject 'superficiality'. In 2021, Wan'an Testing Center officially obtained CNAS laboratory certification, and in 2023, it passed the review and expanded its testing scope, further consolidating the group's technological leading advantage and continuously carrying out rigorous product testing.   The powder coatings produced by the group for Wanan automobiles can achieve precise performance matching for different automotive components. They provide superior weather resistance, chemical corrosion resistance, scratch resistance, and impact resistance for key parts such as wheels, engines, gearboxes, seats, and fuel tanks. This ensures that the promise of 'safe and reliable' is fulfilled for every crucial component, safeguarding every journey with utmost safety.   Wan'an Automobile draws inspiration from the brilliant essence of Chinese civilization, incorporating the orderly heritage and life-infused aesthetics of traditional Chinese colors into product design. We always take customer needs as our guide, creating customized coating appearances tailored to them, including color matching, gloss, texture, and other special effects. This allows designers to achieve shape creativity with greater design freedom and flexibility, making coated products a 'carrier of aesthetics' that embodies Eastern aesthetics and brand personality, and enabling industrial design to emanate a cultural charm that stands the test of time. WANAN Wan'an Auto uses powder coatings to respond to contemporary challenges with a green and healthy 'environmental undertone,' defend product quality with a 'hardcore assurance' that safeguards driving safety, and win market favor with a 'color heritage' rooted in traditional aesthetics. What we pursue is long-term protection for safety, lasting companionship with our users, and the enduring brilliance of our products. Wan'an Auto uses powder coatings to craft products that go beyond the 'surface,' ensuring every journey is a worry-free experience.  

Ultimate Aesthetics: Redefining the Standard of High-End Beauty   The foremost trait of a "top influencer" is flawless appearance. Wan'an metal powder coatings are far from being a mere replacement for ordinary metal paints.**Realistic Metallic Texture**: Utilizing advanced bonding techniques, ultra-fine metal powders are perfectly integrated with the base material, displaying a delicate luster and texture that closely resembles real metals like electroplated or brushed finishes, giving the product an innate sense of sophistication. Infinite Color Possibilities: With a vast standard color library (such as RAL color cards) and support for custom colors, whether it is understated champagne gold, deep space gray, or dazzling iridescent hues, every shade can be accurately achieved, creating a unique visual identity for the brand. Enhanced Textures and Effects: Not only can it achieve a variety of finishes including glossy, matte, hammered, and sand textures, but it can also combine metallic shine with patterns to create rich, layered, and highly artistic surface effects, endowing the product with a naturally radiant aura.     Hardcore strength: Not just good-looking, but able to withstand tests.   A true 'top influencer' must be a powerhouse of capability. Wan'an Metal Powder Coatings, with its outstanding physicochemical properties, has built a solid quality moat.   Exceptional Durability: The coating is dense and tough, offering excellent corrosion resistance, chemical resistance, and impact resistance. It can easily withstand harsh conditions such as moisture, salt spray, and wear, ensuring the product remains like new for a long time and significantly extending its service life. Outstanding Environmental Friendliness: The production process has zero VOC emissions and is 100% solid content, fundamentally eliminating the hazards of traditional liquid coatings to the environment and operators, helping enterprises easily achieve green manufacturing and sustainable development. Extremely High Economic Efficiency: The electrostatic spraying process achieves a paint utilization rate of over 95%, with almost no waste. The coating forms in one application without the need for a primer, simplifying the process and significantly reducing overall costs.   Versatile Application: Empowering thousands of industries and unlocking limitless scenarios   The appeal of a 'top influencer' lies in their powerful ability to drive sales, which can enhance the value of various products. High-end Home Appliances: Dressing refrigerators, air conditioners, and washing machines in luxurious finishes to elevate brand positioning. Architectural Aluminum Profiles: Providing curtain walls, doors, and windows with outstanding weather resistance and decorative appeal, becoming urban landmarks. Furniture and Hardware: Ensuring furniture, lighting, locks, and other products combine beauty and durability. Consumer Electronics: Offering 3C product casings a delicate touch and premium appearance, enhancing market competitiveness.   Conclusion Wan'an metal powder coating taking center stage is not by chance. It is a trio of cutting-edge technology, rigorous quality, and avant-garde aesthetics. When selecting a surface treatment solution, choosing Wan'an metal powder coating is not just choosing a material, but making a commitment to exceptional quality, a responsibility towards a green future, and a core competence that maximizes product value. When your product needs a 'battle attire' that dazzles time yet gently embraces the years, Wan'an metal powder coating is undoubtedly the brightest choice for center stage.  

Why Choose Powder Coating? Four Core Advantages That Challenge Perceptions   Ultimate environmental protection, embracing green manufacturing Zero VOC emissions: Powder coatings contain no organic solvents (VOCs), eliminating harmful impacts on the atmosphere and workers' health from the very start, fully complying with the world's strictest environmental regulations (such as REACH, RoHS). Nearly 100% utilization: Using electrostatic spraying technology, oversprayed powder can be recovered and reused, significantly reducing material waste and achieving much higher efficiency than traditional paints, helping you cut costs and improve productivity.   Exceptional performance, providing comprehensive protection​​ Superior durability:​​ The coating is tough and wear-resistant, effectively resisting scratches, impacts, corrosion, chemicals, and extreme weather, significantly extending the product's lifespan.​​ Excellent adhesion:​​ Bonds firmly to substrates like metal, making it resistant to peeling or flaking.​​ Wide variety of options:​​ From smooth, wrinkled, textured finishes to metallic sheens, offering nearly limitless choices of colors, textures, and gloss levels (glossy, matte) to meet any aesthetic requirement.   Efficient and Economical, Optimized Production Process Simplified Process: Usually only one coating and one curing are needed to obtain a thick film coating, eliminating the multiple coating steps and long drying times of traditional paints. Reduced Overall Costs: Higher utilization, lower energy consumption (curing temperature may be lower), and reduced waste disposal costs make the long-term overall costs more advantageous.   Safe and reliable, protecting users' health Coating is safe and non-toxic: The cured coating is inert and non-toxic, making it completely reliable even for use in areas with very high safety requirements, such as children's toys and food-grade equipment (subject to relevant certifications).   Wide Range of Applications: Empowering Thousands of Industries Construction and Building Materials: Aluminum alloy doors and windows, curtain walls, steel structure buildings, providing superior weather-resistant protection. Household Appliances: Refrigerators, washing machines, air conditioners, microwaves, etc., offering aesthetically pleasing and durable surfaces. Furniture: Office furniture, metal home furnishings, combining design appeal with wear resistance. Automotive Industry: Wheels, engine components, body trim, chassis, etc., providing high-performance protection. Electronics and Electrical: Cases, radiators, offering both protective and insulating properties. Horticultural Facilities and Building Materials: Providing excellent rust and corrosion resistance.   WANAN: Your Trusted Powder Coating PartnerWhen choosing powder coatings, the professional expertise of your partner is crucial. At WANAN, we are not just suppliers, but your comprehensive coating solution experts.

    WANAN has officially announced that its multiple series of environmentally friendly high-performance powder coatings have successfully passed the rigorous testing and evaluation of Underwriters Laboratories (UL), and have been awarded the UL certification. This milestone achievement not only indicates that WANAN's products have reached the top international standards in terms of safety, reliability, and performance stability, but also means that the solutions we provide for our customers have obtained the "golden key" to enter the North American and even the global market, providing a strong endorsement for the value enhancement and market expansion of our partners.     What is UL certification? Why is it so important?     UL certification is a globally recognized authoritative safety certification system, especially in the North American market, it is regarded as the "technical passport" for product safety. It is renowned worldwide for its scientifically rigorous testing methods and extremely high standard requirements. For powder coatings, obtaining UL certification means:     1.Outstanding fire safety performance: Certified products excel in flame retardancy, heat resistance and insulation, significantly reducing the fire risk caused by overheating or short circuits in electrical and electronic equipment.     2.Long-term reliability in use: Products that have passed UL certification prove that they can maintain stable chemical and physical properties in long-term usage environments, do not decompose toxic substances, and ensure the durability and safety of end products.     3.The passport to the international market: Whether IT is household appliances, IT equipment, power tools exported to North America, or automotive parts and building materials with strict safety requirements, using UL-certified coatings is a hard requirement for many large purchasers.        The breakthrough and commitment of WANAN     The product series that have passed the certification this time cover various types such as epoxy/polyester hybrid type, epoxy type, high-temperature resistant type, etc., and can be widely applied in fields such as electrical appliance casings, motors, transformers, automotive parts, and office equipment.     Obtaining UL certification is no easy feat. It is a comprehensive inspection of us from raw material procurement, production processes, quality control to management systems. The general manager of WANAN  technical director stated, "The successful acquisition of this certification is the best testament to our long-standing commitment to the philosophy of 'quality first, safety foremost'." It is not merely a piece of paper certificate, but a solemn commitment we make to our customers - what we offer is not just paint, but a reliable safety guarantee.   Create core value for partners     By choosing UL certified WANAN powder coatings, our customers will directly benefit from:     1.Enhance product competitiveness: Help your end products easily meet international safety regulations, significantly strengthening their access capabilities and brand image in high-end markets such as North America.     2.Simplify the procurement process: You no longer need to worry about the certification of coating materials and can focus on the research and development and manufacturing of core products.     3.Ensure supply chain security: Guarantee the safety and compliance of your product materials from the source to reduce potential risks.   Looking forward to the future       Successfully obtaining UL certification is an important step in the internationalization strategy of the WANAN. In the future, we will continue to increase our investment in research and development, uphold our unwavering pursuit of quality and safety, and be committed to providing global customers with more environmentally friendly, safer and more outstanding coating solutions. We will join hands with our partners to jointly draw a new blueprint for high-quality development.

What exactly is it? "Freeze-drying" the paint into a fine powder like flour is powder coating. The biggest difference from traditional paint: it does not contain any solvents, and you can paint the wall with water? No, it doesn't add even a drop of water, it's 100% solid powder, truly zero VOCs.   Why is it called "zero waste" paint? 1. The unused powder can be recycled and resprayed, with a utilization rate of up to 99%, and there is almost no waste in the factory. 2. One-time film formation: 70-100 μm thickness can complete the protective decoration, eliminating the repeated process of primer and middle coating.3. Fast curing: 180-200 °C for 10-15 minutes, the coating immediately turns into a dense "plastic armor", and the hardness and adhesion are instantly full.   Construction is three steps 1. Pretreatment: Degreasing→phosphating→ washing to make the metal surface "hairy" and increase adhesion. 2. Electrostatic spraying: The spray gun makes the powder negatively charged, the workpiece is grounded, and the powder is evenly adsorbed as if it is attracted by a magnet.3. High-temperature curing: 180-200 °C in the oven, the powder is melted into a liquid, then cross-linked into a solid coating, and cooled.   How to calculate the environmental protection account? 1. VOC emissions: 0 g/L (200-400 g/L for conventional paints) 2. Waste: <1% (30% > conventional spraying)3. Energy consumption: 15-25% lower energy consumption than water-based paint drying for the same thickness   Common misconceptions 1. "Powder can only be sprayed with metal" ❌ Low-temperature curing powder (130 °C) is now available, which can be sprayed with MDF boards and plastic housings.2. "Powder color is monotonous" ❌Through Bonding technology, thousands of effects such as metal flash silver, wrinkles, sand patterns, and imitation wood grain can be achieved.   Summary in one sentence Powder coating is like putting a "customizable, zero-pollution, lifetime maintenance-free" colored armor on an industrial product, allowing beauty, durability, and environmental protection to shake hands with the same product.

In the ever-evolving world of coatings, powder coatings have emerged as a revolutionary and sustainable alternative. This article delves into the latest happenings in the powder coatings industry, exploring new technologies, market trends, and the impact on various sectors.​ Technological Advancements Driving the Industry Forward​ One of the most significant trends in the powder coatings realm is the continuous development of innovative technologies. Manufacturers are constantly striving to improve the performance and quality of powder coatings, making them more durable, efficient, and environmentally friendly.​ Low-Temperature Curing Technologies​ A notable advancement is the rise of low-temperature curing powder coatings. Traditional powder coatings often require high temperatures for curing, which can be a limitation, especially when coating heat-sensitive substrates like certain plastics or wood composites. However, recent research and development efforts have led to the creation of powder coatings that can cure at significantly lower temperatures, typically in the range of 120°C to 150°C. This not only expands the range of materials that can be coated but also reduces energy consumption during the curing process, aligning with the global push for sustainability. For example, companies like AkzoNobel have introduced low-cure powder coating innovations that cure at temperatures as low as 150°C while maintaining high-performance standards. This is a major leap forward in both sustainability and process efficiency, and the trend towards even lower curing temperatures is expected to continue.​ Antimicrobial and Special Functionality Coatings​ In response to the growing demand for enhanced hygiene and specialized coatings, there has been a surge in the development of antimicrobial powder coatings. These coatings are designed to inhibit the growth of bacteria, fungi, and other microorganisms on coated surfaces. They find applications in various sectors, such as healthcare facilities, food processing plants, and public spaces, where maintaining a clean and germ-free environment is crucial. Italian company Stardust Powder Coatings, for instance, started the development and testing of antiviral powder coatings in March. These coatings can reduce the risk of virus transmission on metal surfaces, such as furniture and lighting fixtures, by inhibiting the viruses present on them. Additionally, powder coatings with other special functionalities, such as self-cleaning properties, electrical insulation, and high chemical resistance, are also being developed to meet the diverse needs of different industries.​ Advance​d Pigment and Additive Technologies The use of advanced pigments and additives is another area of progress in powder coatings. Pigments not only provide color and opacity but also play a role in UV protection and durability. New pigment technologies are enabling powder coatings to achieve a wider range of aesthetics, including metallic and pearlescent effects. Additives, such as flow modifiers, degassing agents, and UV stabilizers, are being refined to improve the overall performance of powder coatings. Flow modifiers help in achieving smoother finishes, degassing agents prevent bubble formation during the curing process, and UV stabilizers enhance the outdoor performance of coatings, making them more resistant to fading and degradation caused by sunlight.​ Market Trends and Growth Prospects​ The powder coatings market has been experiencing steady growth in recent years, driven by factors such as environmental regulations, increasing demand for sustainable products, and the expanding applications of powder coatings across multiple industries.​ Global Market Expansion​ According to MarketsandMarkets, the market size for powder coatings is projected to grow from ​ 11.6billionin2020to   14.9 billion by 2025, at a compound annual growth rate (CAGR) of 5.2 percent. The Asia-Pacific (APAC) region, particularly China, India, and Southeast Asian countries, is witnessing strong growth in the powder coatings market. In 2023, the global powder coatings market reached a total volume of around €12.4 billion, constituting 15 - 20% of the global industrial coatings market. Asia leads the way in terms of growth, reflecting rapid industrial growth and a shift towards sustainable production methods. North America and Europe are also significant markets, driven by strict environmental standards and high-performance demands.​ Growing Demand from Key Industries​ Powder coatings are finding widespread use in various industries. In the automotive sector, they are used for coating wheels, trims, chassis, and other components, providing high durability and corrosion resistance. With the increasing production of electric vehicles (EVs), the demand for powder coatings in this segment is expected to grow further, as EV manufacturers seek coatings that can withstand the unique requirements of electric vehicle components. The appliances industry is another major consumer of powder coatings, applying them to refrigerators, washing machines, ovens, and other household appliances to provide a tough, protective, and aesthetically appealing finish. In the architectural and construction industry, powder coatings are used for both indoor and outdoor aluminum and steel structures, such as window frames, doors, fences, and facades. They offer excellent weather resistance and color retention, making them a popular choice for building exteriors. The furniture industry also benefits from powder coatings, as they enhance the lifespan, color retention, and scratch resistance of metal office furniture, shelving, and outdoor furniture. Additionally, in the electronics industry, powder coatings are used to protect electrical components due to their excellent thermal and electrical insulation properties.​ Sustainability as a Key Driver​ Sustainability is a major factor fueling the growth of the powder coatings market. Powder coatings are environmentally friendly as they do not require a liquid carrier, resulting in no release of harmful volatile organic compounds (VOCs). This makes them compliant with strict environmental regulations in many regions. Moreover, powder coatings are highly recyclable, with up to 95% of overspray powder being able to be recycled and reused. The electrostatic spraying process, which is commonly used for applying powder coatings, decreases the overspray rate, leading to a utilization rate of more than 90%, a clear advantage over traditional liquid paint systems. The ability of powder coatings to provide extreme hardness and good adherence in just one layer, without the need for a primer in many cases, while also offering superior corrosion resistance, makes them an economical and sustainable choice for many applications.​ Challenges and Solutions in the Powder Coatings Industry​ Despite the numerous advantages and growth prospects, the powder coatings industry also faces certain challenges.​ Regulatory Pressures​ The industry is subject to various regulatory requirements, both in terms of environmental regulations regarding emissions and safety regulations related to the composition of coatings. For example, the recent EU ruling classifying titanium dioxide as a category 2 - suspected carcinogen by inhalation has had a significant impact on the powder coatings industry. This directive requires the labelling of mixtures (including coatings) that possess more than 1% content of TiO₂. Since this colorant pigment is estimated to be present in over 60% of all powder coatings produced worldwide, and there is currently no replacement that can match its opacity, performance, and cost-effectiveness, coating producers have been forced to revamp their labels and Safety Data Sheets. To address such regulatory challenges, the industry needs to invest in research and development to find alternative materials and formulations that meet the regulatory standards without sacrificing performance.​ Competition from Traditional and Alternative Coatings​ Powder coatings face competition from traditional liquid coatings, which still hold a significant share in the market, especially in some applications where they have established usage patterns. Additionally, new alternative coatings, such as water-based coatings, are also emerging as competitors. To stay competitive, powder coatings manufacturers need to continuously demonstrate the unique advantages of powder coatings, such as their superior durability, environmental friendliness, and cost-effectiveness over the long term. They must also focus on innovation to develop coatings that can outperform traditional and alternative coatings in specific applications.​ Cost Pressures​ The cost of raw materials, energy, and production can pose challenges to the powder coatings industry. Fluctuations in the prices of resins, curing agents, pigments, and other raw materials can impact the profitability of manufacturers. Rising energy costs also affect the curing process, which is energy-intensive. To mitigate these cost pressures, companies are exploring ways to optimize their production processes, improve resource efficiency, and source raw materials more cost-effectively. Recycling overspray powder and implementing energy-saving measures in the curing process are some of the strategies being adopted.​ The Road Ahead for Powder Coatings​ Looking to the future, the powder coatings industry is expected to continue its growth trajectory, driven by technological advancements, increasing demand for sustainable coatings, and expanding applications in various industries. The development of new and improved powder coating technologies, such as further advancements in low-temperature curing, antimicrobial coatings, and specialized functionality coatings, will open up new markets and opportunities. As environmental regulations become even more stringent globally, powder coatings' eco-friendly characteristics will make them an even more attractive option. The industry will also need to collaborate closely with raw material suppliers, equipment manufacturers, and end-users to address challenges and ensure the continued success of powder coatings in the coatings market. With the right strategies and a focus on innovation, powder coatings are set to play an increasingly important role in the coatings landscape in the years to come.​  

introduction Powder coating is a solid coating in powder form. This is a type of paint that is usually dispersed with air as a carrier and applied to the surface of the wheel hub. Electrostatic spraying is usually adopted, which has attracted great attention from the entire coating industry with its high production efficiency, excellent coating performance and appearance effect, good ecological environmental protection and outstanding economy in the world. With an annual growth rate of more than 12%, it is one of the most promising paint varieties. In the film-forming process of powder coating, many phenomena are related to surface tension. For example: pinholes on the surface, orange peel, peeling of coatings, mismatch between paints and coatings, etc. To this end, the following focuses on analyzing and solving the problem from the surface tension of the powder. 1. The manufacturing process of powder coatings The determination of powder coating formula is generally determined according to the technical requirements of the customer's product and its own production environment, and the formula design should fully consider the customer's requirements and the rationality of its own production.   2. Coating of powder coating The coating production line is completed according to the technical requirements of the coated workpiece and the generation batch.   3. Powder coating film-forming process After the powder coating is applied to the surface of the wheel, there are generally four processes in the film formation process:   3.1 Softening process After the powder absorbs a certain amount of heat, the resin in the powder will become sticky and soften due to heat absorption.   3.2 Melting process When the resin in the powder absorbs a certain amount of heat, the active chemical bonds in the resin open. The powder will then exist on the surface of the product in a molten state. This phase is extremely short.   3.3 Leveling process When the powder exists on the surface of the product in a molten state, it flows from a continuous uneven surface to a relatively smooth and flat surface, which is the leveling process.   3.4 Curing process After melting, the active chemical bonds of the powder coating increase sharply in molecular weight and viscosity through cross-linking reaction, and finally solidify into a hard coating film, which is the curing process.   4. Brief description of surface tension Any force acting on the surface of a liquid, reducing the surface area of the liquid. This is called liquid surface tension. It occurs due to the presence of a thin layer on the surface where the liquid comes into contact with the gas, called the surface layer. The molecules in the surface layer are sparser than those inside the liquid, and the distance between the molecules is larger than that inside the liquid, and the interaction between the molecules is manifested as gravitational force, and the surface energy of the powder coating particles when they are melted is similar to that of the general liquid. Therefore, the powder coating film formation process can be analyzed.   5. Several surface tension problems related to powder coating   5.1 Orange peel Orange peel is a local vortex effect of liquid flow during the film-forming process of powder coatings. This is due to the change in surface tension due to the change in viscosity during melting of the powder coating. In this way, a high viscosity and low surface tension coating sinks to the middle of the vortex (i.e., the later depression), and a low viscosity and high surface tension coating rises to the periphery of the vortex (i.e., the later convex part), and the following measures can be taken to reduce the effect of orange peel:   5.1.1 Regular spraying and baking A coating that is too thick at one time or bakes that heats up too quickly can cause the orange peel to be noticeable. The primary coating should be 60-80um, and the melting leveling time should be appropriately extended, which is conducive to the leveling of powder coating.   5.1.2 Increase the viscosity of powder coatings From the above reasons for the formation of orange peel, it can be seen that increasing the viscosity of powder coating during melting can increase the flow resistance during melting and reduce orange peel.   5.1.3 Appropriate selection of leveling agent Generally, the leveling agent used for powder coating should have two effects, namely wetting effect and leveling effect. The wetting effect is to increase the leveling of the system when the powder is around 1O0°C. At this time, the surface tension should be as small as possible, i.e. the leveling effect greater than 150°C is the main one. The surface tension of the powder should be a little larger to increase the leveling properties, so usually the leveling agent generally contains more than two materials.   5.2 Shrinkage porosity Shrinkage pore refers to a special defect on the surface caused by a point of low surface tension during the formation of a powder coating. If observed with an electron microscope. Shrinkage porosity is mostly formed by a small number of insufficiently wetted particles and the surrounding incompatible resin, that is, in a large sag vortex, there is a protruding small dot coating film flowing from the low surface tension point to the high surface tension point to form the shrinkage porosity. In general, the low surface tension point can be dust, oil droplets, etc. during processing, or it can be powder that has not been sufficiently wetted. In order to reduce the impact of cratering, the following measures can be taken:   5.2.1 Cleanliness of the entire processing environment In order to avoid the occurrence of shrinkage porosity due to external environmental reasons, special attention should be paid to the cleanliness of the entire working environment.   5.2.2 Properly select some wetting agents Some wetting agents can effectively wet and disperse particles that cause cratering.   5.3 Pinholes Pinhole refers to the process of powder coating from melting to curing, and the gas in the powder coating passes through the high-viscosity, nearly closed elastic resin layer from the bottom layer to the coating surface. The defects formed by the non-escape are generally caused by the low molecular substances brought in the raw materials, the volatiles adsorbed on the surface of the coated workpiece, the defects caused by the powder coating process, or the defects generated during the curing process of some types of powder coatings. These bubbles form a certain number of bubble groups in the molten state of the coating film. In order to reduce the effect of pinholes. The following measures can be taken: strictly control the quality of the surface treatment of the wheel hub and the spraying process. The surface treatment of the wheel hub is required to contain stains, spots and other small molecule substances attached to the surface of the hub. If it is a large workpiece such as cast iron, it is recommended to preheat it first, and the air compressor should release water frequently. When electrostatic spraying, it is necessary to control a certain thickness of the coating film, and it is recommended not to exceed 100um.   6. Conclusion We firmly believe that the development of thermosetting powder coating is bound to be the trend of the times, with the continuous innovation of products (such as low-temperature curing, super weather resistance, etc.), for the application of powder coating to expand a broader field, and constantly promote the development of the entire powder coating industry.  

Definition and technical characteristics of powder coatings Powder coating is a coating that exists in a powder state and has solid properties, which is different from traditional liquid coatings. Its main components include resins, pigments, hardeners and additives. The application process of powder coating usually consists of two steps: electrostatic spraying and high-temperature curing. In the electrostatic spraying process, the powder coating is sprayed onto the grounded metal surface by an electrostatic spray gun to form a uniform coating. Subsequently, the coating cures at high temperatures to form a strong protective film.   The main technical features of powder coating include: Environmental protection and pollution-free: powder coating does not contain volatile organic compounds (VOCs), will not release harmful gases during construction, and is a green building material. Efficient utilization and recycling: The utilization rate of powder coating is high, and the oversprayed powder can be recycled and reused, and the utilization rate can reach more than 99%. Excellent physical properties: The coating has good adhesion, compactness, strength and toughness, and can effectively resist impact and corrosion. Multiple Finish Options: Powder coatings are available in a variety of colors, textures, and gloss levels for creative and custom designs.   Application areas of powder coatings Powder coatings are widely used in many fields due to their excellent performance and environmental protection characteristics: Building materials field: used for surface treatment of aluminum profiles, metal railings, building signs, etc. Home appliance field: suitable for the coating of refrigerators, washing machines, microwave ovens and other home appliance shells. Automotive: Used for painting automotive parts, wheels, wheels, etc. Furniture field: used for indoor and outdoor furniture painting, improve the aesthetics and durability of furniture. Industrial equipment: used for the coating of mechanical parts, pipes, steel structures, etc. Medical equipment: used for painting medical beds, trolleys, trays, etc.   Environmental performance of powder coatings Powder coating is an environmentally friendly and non-toxic building materials coating, which will not volatilize harmful substances during construction, and its material recycling rate is as high as 99%. In addition, powder coatings do not involve volatile organic compounds (VOCs) during production and use, and do not negatively affect air quality. This kind of coating will not produce waste water, waste gas and other "three wastes" problems in the curing process, which greatly reduces the risk of environmental pollution.   The future of powder coatings With the enhancement of environmental awareness and the advancement of technology, the application range of powder coatings continues to expand. For example, the development of low-temperature curing powder coatings allows them to cure at lower temperatures, saving energy and reducing CO2 emissions. In addition, the use of renewable and recycled raw materials, such as recycled PET bottles, further reduces the environmental impact.   conclusion Powder coatings have become an important choice for modern painting due to their environmentally friendly, efficient, durable and versatile characteristics. It not only meets the aesthetic requirements of the product surface, but also provides excellent protection performance, while meeting environmental protection requirements and reducing the impact on the environment. With the continuous advancement of technology, the application range of powder coatings will be further expanded, providing environmentally friendly and efficient coating solutions for more industries.  

  WANAN metal powder coatings The sun burns for 4.6 billion years, and the aurora dances for thousands of years...... Light does not need to be created, but only desires a "stage", to be transmitted, frozen, and seen. Wan'an metal powder coating makes the light stop, and the substrate dances with the light. We don't create light, we transmit light. In the microcosm of WANAN metal powder coatings, ultra-fine metal pigments such as aluminum powder and pearlescent powder with a content of up to 20% build a panoramic stage of light. When the beam of light pours from any angle, each ultra-fine metal particle can refract the dazzling light finely, forming a 360° high-flash effect without blind spots, presenting a glossy finish comparable to liquid paint with soft and delicate light and dark changes. On the wheels of the car, light and shadow rotate with the wheels to outline a dynamic arc; On the curtain wall of the building, the sunlight swayed into tiny stars...... WANAN metal powder coating makes every collision between light and substrate a visual feast of Ambilight. WANAN Group has been deeply involved in the field of powder coating for nearly 30 years, and attaches great importance to the safety, reliability and quality stability of powder coating products while attaching great importance to R&D investment. The group's testing center has passed the CNAS laboratory certification and continues to carry out rigorous testing work on metal powder coating products. The 180° extreme bending failed to swallow the light, and the 1,000-hour accelerated aging did not dim the luster; Excellent impact resistance, so that it will not fall off or crack under 4x magnification...... Whether it is acid rain washing, salt spray immersion, or damp heat erosion, the coating of VIE metal powder coating is always durable and inextinguishable, with a "steel-like" will, to complete the mission of transmitting light.

At a time when environmental protection requirements are becoming increasingly stringent, the Ministry of Ecology and Environment issued the "Opinions on Strengthening the Environmental Impact Assessment of Construction Projects Involving New Pollutants in Key Industries", which is like a bombshell, causing a strong shock in the powder coating industry. This "test" not only tests the compliance ability of enterprises, but also quietly reshapes the competitive pattern and development logic of the industry, prompting the powder coating industry to embark on the road of change from "passive compliance" to "active transformation".   New Pollutants: A "Must-Answer Question" for the Powder Coating Industry New pollutants, as chemical substances with biotoxicity, environmental persistence, bioaccumulation, etc., but have not yet been included in routine environmental management, are clearly included in the scope of control by the Opinions. The 14 categories of substances in the "List of Key Controlled New Pollutants (2023 Edition)", the list of toxic and harmful pollutants and the annexed substances of the "Stockholm Convention" have all become the key objects of control, and the provisions of "construction projects that do not meet the requirements of new pollutant control will not be approved" have drawn a strict red line for the powder coating industry.   The triple pressure of raw materials, processes and costs From project approval to production, the impact of new pollutant control policies on the powder coating industry is everywhere. During the project approval process, new construction, renovation or expansion projects involving the production or use of new pollutants prohibited in the list will be directly rejected, and the expansion plan of traditional solvent-based powder coatings containing high VOCs or other prohibited substances will be blocked. At the source of production, enterprises must start from the selection of raw materials and process optimization to reduce the generation of new pollutants, and the traditional production mode that relies on heavy metal additives or solvents that are easy to release persistent organic pollutants needs to be changed urgently. In terms of emission and monitoring, enterprises need to ensure that new pollutants are stably discharged up to standards, included in the management of pollutant discharge permits, and regularly carry out self-monitoring of substances that meet the monitoring conditions to accept real-time supervision. This series of measures has completely broken the inherent model of "focusing on end treatment and light source prevention and control" in the powder coating industry in the past.   However, the implementation of policies has also brought many challenges to enterprises. When it comes to raw material procurement, companies have had to abandon their price-driven sourcing strategy in favor of rigorous "environmental audits" of suppliers, which not only cost a lot of time, but also face a shortage of high-quality raw materials and rising procurement costs, as evidenced by the fact that environmentally friendly resins are 10% to 20% more expensive than traditional products. In terms of production process, in order to meet the requirements of new pollutant emission reduction, enterprises must upgrade technology, and the transformation of waste gas treatment process and formula adjustment require a lot of capital and technology, and the cost of a single production line transformation is as high as millions of yuan. In terms of environmental monitoring, the establishment of a whole-process monitoring system has led to a continuous increase in the compliance costs of enterprises in terms of equipment purchase, staffing and third-party entrustment, and the annual monitoring and compliance costs of small and medium-sized enterprises are expected to increase by 30% to 50%.   Opportunities in the crisis: green transformation activates new momentum for the industry But crises often go hand in hand with opportunities. The green transformation has brought new development momentum to the powder coating industry. Green products have gradually changed from "compliance just needs" to "market selling points", and environmental protection products such as water-based powder coatings, high-solids powder coatings, and heavy metal-free additives systems have become R&D hotspots, and the order volume of a leading enterprise has increased by 40% year-on-year after the water-based powder coating production line has been put into operation. In terms of brand premium, companies that have passed the new pollutant control certification can turn their environmental protection advantages into market competitiveness and gain a higher market share in specific market segments. In the field of technological innovation, the industry-university-research cooperation between enterprises and universities and scientific research institutions has been deepened, and the new technologies jointly developed not only improve the efficiency of pollutant treatment, but also reduce costs, and promote the development of the industry in the direction of high-end and intelligence.   How can enterprises hand over the "green answer sheet"? In the face of the challenges and opportunities brought by the control of new pollutants, powder coating companies should take the initiative to find a way to break the situation. Strengthen internal management, establish a whole-process management system, set up a full-time environmental protection department, and build a solid line of defense for environmental protection through digital tracking and employee training. Increase R&D investment, invest 3%-5% of annual revenue in environmental protection technology R&D, participate in the formulation of industry standards, and control the right to speak. Deepen policy coordination, take the initiative to connect with ecological and environmental departments and industry associations, share technical experience, and reduce transformation costs. Tell the "environmental protection story" well, convey the concept and results of environmental protection to customers and society in a variety of ways, and enhance brand value. The Ministry of Ecology and Environment's "New Pollutant Control Order" is a comprehensive inspection of the powder coating industry, and it is an important opportunity to promote the upgrading of the industry. Those companies that can break through in this green test will surely occupy a favorable position in the future wave of green economy and reap policy dividends and market share. When "green" truly becomes the background color of the powder coating industry, the industry will also usher in a new future of high-quality development.

Heat-resistant powder coating refers to a protective powder coating that can withstand high temperatures above 200 °C for a long time, and the coating film does not change color and is not damaged, and can still maintain appropriate physical and mechanical properties. The heat resistance of silicone powder coating is relatively high, but its price is high, the initial appearance and mechanical properties are not very good, the curing temperature is high, and it is quite difficult to obtain a coating film with long-term high temperature resistance of more than 400°. Although the heat resistance of epoxy resin itself is worse than that of silicone resin, its performance is relatively comprehensive; By modifying and adding appropriate curing agents and pigments, good heat resistance can also be obtained. Therefore, heat-resistant epoxy powder coatings are widely used.   1 Performance requirements for heat-resistant epoxy powder coatings 1.1 Heat resistance Heat resistance is the most important performance index, some products may not be used at a certain high temperature for a long time, therefore, heat resistance can be divided into long-term and short-term two. According to the performance requirements of the object and other aspects, the appropriate modified epoxy resin, curing agent and pigment filler can be selected to achieve the purpose of low price and high quality.   1.2 Mechanical Properties This includes both initial and late mechanical properties. Due to the limitations in the selection of curing agents and pigments and fillers, their mechanical properties can be slightly reduced compared with the requirements of general powder coatings; However, it is important that the mechanical properties are not reduced too much in the later stage.   1.3 Anti-corrosion properties (including chemical resistance) The anti-corrosion performance of epoxy resin is relatively good, therefore, epoxy powder coating can fully meet the requirements of this aspect.   1.4 Appearance Including flatness, gloss, color and other properties. The flatness can vary depending on the object of use. In general, slight orange peel should be allowed. Gloss mostly requires a flat and matte finish, which is completely achievable. As for colors, especially light colors, it is more difficult to keep them the same at all. Antioxidants and hindered amines can be added appropriately to solve the problem.   1.5 Storage stability Since it is not a high-temperature fast-curing and the Tg of the resin is high, the storage stability should be no problem. conclusion There are many varieties of high-temperature resistant polymers, but there are still certain difficulties and problems in preparing powder coatings that can meet the requirements in all aspects. With epoxy resin, after modification and selection of appropriate curing agents and pigments, powder coatings with different high temperature requirements (200~600 °C) can be prepared. Heat-resistant epoxy powder coating can be widely used in household appliances: such as barbecue grills, heaters, high-power lighting, and high-temperature parts of mechanical equipment, such as smoke exhaust pipes, high-temperature furnaces, petrochemical plants, aircraft, missiles, aerospace equipment, etc. Heat-resistant epoxy powder coatings can also be used for the coating of electrical insulating materials. Brominated epoxy resin or appropriate flame retardant can also be used as a flame retardant powder coating.

Electrostatic spraying can give parts better appearance quality and strong environmental adaptability, and has been widely used in the coating industry. It has significant advantages over traditional painting processes: no primer, no thinner; No pollution to the environment, no toxicity to the human body; The construction is simple, and there will be no sagging phenomenon common in the painting process; The appearance quality of the coating is excellent, the adhesion and mechanical strength are high, and the corrosion resistance and wear resistance are strong; Short curing time, high production efficiency and low cost. Although the surface quality of the substrate has been fully considered at the beginning of the design structure and process of the radar parts, the coating quality is affected due to the inherent defects of the non-processed surface, the processing defects of the processing surface, and the bumps and extrusion defects caused by the transfer process, and it is necessary to fill the conductive putty.   1. The main factors affecting the quality of electrostatic spraying of parts   The main factor affecting the surface quality of electrostatic spraying is the defects of the parts themselves, which are mainly reflected in the pits formed by scratches, extrusions, bumps, rusts, spot welding, riveting, etc., as well as the sand holes, pores, loose and small knife lines exposed after machining of castings. As shown in Figure 1, some of these defects can be repaired by means of polishing and sanding, while others can only be filled with conductive putty. And because the composition of conductive putty is basically similar to ordinary putty, it also has the disadvantages of ordinary putty. The main manifestations are: poor adhesion and low bond strength; The surface is not delicate enough, the texture is poor, and the toughness is lacking; It is easy to pulverize after moisture; After a certain period of time, cracking, peeling, and falling off will occur. In addition, the skill level of the operator, the quality of the electrostatic powder, the performance of the equipment, the operating environment, the processing process, etc., will also affect the quality of the electrostatic spraying of parts. 2. Idea and comparative test to improve the performance of conductive putty   Analyzing the above many factors, most of them can be effectively solved by modifying the design, improving the process, operating training, improving facilities, meticulous turnover, etc., only the performance of conductive putty can not be controlled. Because it must have good conductivity, excellent adhesion, strong filling, high temperature resistance of 180 °C and other characteristics, and the conductive putty currently sold on the market is difficult to fully meet the use environment and technical requirements of existing products. To this end, the author has made some attempts and comparisons in long-term production practice, hoping to improve the performance of conductive putty through some technical means.   2.1 The method to improve the performance of conductive putty First, consider using a finished conductive putty. However, commercially available conductive putty often has poor conductivity, low powder rate, and unsatisfactory coating effect. So can a certain proportion of conductive material be added to the conductive putty to improve its conductivity and powder rate?Second, consider adding a conductive material to the adhesive so that it is both fillable and conductive. But when a conductive material is added to the adhesive, it will definitely destroy its adhesion and reduce its adhesion, so how much will this affect the coating?In addition, consider using acetone to adjust the paint into a powder slurry and then apply it to the defect with a brush. But the question is whether the paint will blister under high temperature baking after containing a certain amount of acetone?   2.2 Test protocol According to the above ideas, three schemes to fill the defects were designed by using the existing materials:(1) Add an appropriate amount (5%~10%) of aluminum powder after fully stirring the commercially available conductive putty to improve its conductivity. If it is a two-component putty, it needs to be scraped as soon as possible, and it must be used up within the gel time to avoid thickening and agglomeration.(2) Choose a variety of adhesives with good resistance to media (such as oil, water, acid, alkali, etc.), strong adhesion to metal, low temperature drying, high temperature use, non-toxic, and cheap adhesives to add conductive aluminum powder.(3) Take the powder used in the workpiece and mix it into a powder slurry with acetone. It should not be too thick to avoid leaving brush marks; It should also not be too thin, otherwise the solids content is too small to fill the defect. Generally, it is more appropriate to control the solid content at 60%~65%, and then apply the brush to the defect with a brush and bake it in an oven at 180°C for about 30min.   2.3 Test Results According to the above three schemes, the comparative test of electrostatic spraying was carried out on some specimens with similar surface defects.Test process: degreasing, rust removal→ drying→ putty-coating→ drying→ grinding→ soot blowing→ powder spraying → curing.After adding a small amount of aluminum powder to the commercially available conductive putty, the adhesion between the putty and the workpiece decreases significantly, and the increase in solid content makes it difficult to scrape, while the conductivity is slightly improved but still not ideal. Although the putty prepared with adhesive has good conductivity, the adhesion is poor, and due to the addition of a certain amount of aluminum powder, the putty prepared has the phenomenon of pulverization, which is prone to cracking, blistering, falling off, etc.The filling property of the putty made by scheme 3 is too poor, and it needs to go through many times of "brushing→ spot coating→ baking → grinding" to achieve the filling effect, although the conductivity is good, but the blistering is serious.It can be seen that all three options are not ideal. After careful analysis, it is believed that the main reason for the coating defects is that the inherent physical and chemical properties of the original material have been artificially changed, and although the conductivity effect has been improved, the adhesion, delicacy, and operability are obviously damaged, so we can only seek a breakthrough from the physical aspect.   3. The method of making self-made conductive putty with powder coating Recalling that when grinding and reworking some sprayed workpieces, it was found that the original defects such as small pits, cracks, and sand holes on the surface of the workpiece were often not as obvious as before. Could it be that the coating that is not easy to sand off at the defect plays the role of putty? Therefore, it was considered to use the molten powder coating directly as a conductive putty.   3.1 Filling of defects such as sand holes and knife lines in large areas In order to achieve the best filling effect, a thicker coating must be obtained at the defect, and preheating the workpiece can significantly increase the thickness of the powder coating, as the resistance of the powder tends to decrease as the temperature increases. When the temperature of the workpiece increases, the amount of charge neutralized by the powder through grounding discharge will increase accordingly, and the charge accumulation will be reduced, so the powder layer can be adsorbed thicker. In actual operation, the workpiece is often preheated first, and then thermal spraying, and then polished with tools such as grinding machines and polishing machines, and grinding until the non-defective parts are faintly exposed to the bottom layer of the metal, and the powder coating left by the defective places plays the role of putty.   3.2 Filling of local defects The overall grinding amount of the workpiece is large after spraying, and the powder coating is seriously wasted, so the scattered small area defects should be partially filled with powder. First of all, the workpiece should be preheated, and the preheating temperature should be 20~30°C higher than the normal curing temperature of the powder coating. Make the defect surface level upward, immediately scoop the powder with a small utensil such as an ear picker, and pile up locally at the defective place, and strive to be accurate when stacking, and try not to exceed the defect range too much, as shown in Figure 2. The powder used should be of the same brand, model, color and batch as far as possible with the powder to be sprayed at the end.Immediately afterwards, the workpiece is placed horizontally in the oven. In order to avoid the aging of powder coating caused by multiple baking, the baking temperature should be 20~30 °C lower than the normal curing temperature of powder coating, and the baking temperature should be about 15min. If it is a sand hole of a casting, the workpiece should be taken out after baking for about 10min, and a small scraper should be used to scrape the molten powder to squeeze it into the depths of the sand hole to exhaust the air, so as to avoid bubbles after the final overall spraying, and then put the workpiece into the oven to continue to solidify after scraping. After curing, the workpiece is cooled and sanded with 240# abrasive cloth. If the defect is not even, repeat the above process once. Since this method is mainly suitable for workpieces with small defects such as spot welding, sand holes, scratches, etc., it is usually enough to fill the defects with 2 times of composting.   Repeated tests under different types, different brands, different colors, different gloss, different temperatures and other conditions show that the method of local accumulation of powder coating at the defect of the preheated workpiece has good filling, good repair effect on various fine defects, and good conductivity, excellent powder absorption, uniform powder loading during the overall spraying, and does not affect the performance of the final powder coating film.