Powder spraying utilizes the principle of electrostatic spraying to adsorb dry powder on metal aluminum profiles. After being baked at high temperatures above 200 ℃, the powder solidifies into a layer of about 60 microns thick, strong, and shiny coating. Make the surface of the product smooth, uniform in color, and resistant to acid, alkali, impact, and wear. Can withstand strong ultraviolet rays and acid rain for a long time without coating powdering, fading, peeling, and other phenomena. The service life of powder coated aluminum profiles under normal conditions is 30 years. Ensure that the surface coating does not fade, discolor, or crack within 5-10 years. Its weather resistance and corrosion resistance are superior to ordinary aluminum materials, and it comes in a variety of colors.
Coatings are prepared by mixing special resins, pigments, fillers, curing agents, and other additives in a certain proportion through processes such as hot extrusion, crushing, and screening. They are stable when stored at room temperature. After electrostatic spraying, friction spraying (thermosetting method) or fluidized bed immersion coating (thermoplastic method), it is heated, baked, melted and solidified to form a smooth and shiny permanent coating film, achieving the decorative effect. And the purpose of anti-corrosion.
Its characteristics are:
1. The product is non-toxic, solvent-free, free of volatile and toxic substances, free from pollution, fire, and emissions of "three wastes" and other public hazards, fully complying with relevant national regulations. National Environmental Protection Law.
2. High utilization rate of raw materials. Some well-known powder suppliers produce overspray powders that can be recycled, with a maximum utilization rate of over 99%.
3. After pre-treatment, the coated material can be applied in one go without the need for primer to obtain a sufficiently thick coating, which is easy to achieve automated operation, high production efficiency, and cost reduction.
4. The coating is dense, has good adhesion, strong impact resistance and toughness, high corner coverage, excellent chemical resistance and electrical insulation.
5. The storage and transportation of powder coatings are safe and convenient.
Compared with traditional painting techniques, the advantages of powder coating are:
1. High efficiency: Due to one-time film formation, it can increase productivity by 30-40%. 2. Energy saving: reduce energy consumption by about 30%
3. Less pollution: no organic solvent volatilization (paint does not contain harmful gases such as toluene and xylene).
4. High utilization rate of coatings: up to 95% or more, and the powder can be reused multiple times after recycling.
5. Good coating performance: The thickness of a single coating can reach 50-80 μ m, and its comprehensive indicators such as adhesion and corrosion resistance are superior to the paint process.
6. High yield: can be re sprayed twice before solidification. There are many types of powder coating processes, and the two common ones are electrostatic powder spraying and immersion coating.
Powder coating is a new type of solvent-free 100% solid powder coating. It has the characteristics of solvent-free, pollution-free, energy-saving, reducing labor intensity, and high mechanical strength of coating film.
It is divided into three categories: thermoplastic powder coatings (PE), thermosetting powder coatings, and building powder coatings.
