Powder coating to powder coating and coating pattern of the formation, solid points can amount to 100%, because do not use solvents, so can reduce the pollution of the environment and save resources, and has the recovery features. Functional powder coating is a special function, to provide special-use surface coating materials. It not only can play the traditional role of protection and decoration, also gives the material a variety of special features, including insulation, electrical conductivity, pollution, heat, flame, radiation and other features. Now commonly used internationally functional powder coatings generally have the following type.
Insulating powder coating: is used in motors, electrical and electronic components of a special coating, powder coating in addition to the general protection, decorative performance, but also has good electrical insulation properties. Manufacture of insulating epoxy powder coating is the main raw material. It can change the type of curing agent, or adding special modifiers and has excellent insulation and heat resistance of the filler to adjust the curing rate, manganese powder has been from the very soft and flexible to very hard, wear-resistant coating of a variety of to adapt to different conditions of application of insulation. In recent years, in addition to epoxy powder coatings, polyurethane powder coating, powder coating polyimide, acrylic powder coatings has also been developed and used.
Conductive powder coating: non-conductive substrate is applied, so that a certain conduction current and the ability of functional coatings eliminate static electricity. Such coatings are mainly two kinds: blending-type and intrinsic type. Blending powder coating is the main film-forming polymer insulation material, in which the incorporation of conductive filler to form a coating. Conductive fillers are metal powders, such as silver, nickel, zinc, aluminum, etc.; non-metallic powder, such as graphite, carbon black, etc.; metal oxides such as zinc oxide, antimony and so on. The main choice of binder vinyl resins, polyester resins, polyamide and epoxy resins. Intrinsic conductive polymer is the polymer itself is conductive, the current theory and research is still in the stage, there is no practical application.
Anti-corrosion powder coating: the current use of such coatings is mainly phenolic anti-corrosion epoxy powder coating, epoxy and phenolic resin, it is based film-forming material, the formation of two cross-linked coating. The coating used in epoxy resin, generally used in the relative molecular mass of 1400,2900 and 3570 varieties of polymer, epoxy resin itself has adhesion, flexibility and alkali resistance and good, and phenolic resin with excellent acid, solvent, heat, humidity and other properties of cold, are combined to become the ideal anti-corrosion material type. Since the reaction between the epoxy and phenolic resin activity is weak, so the coating film at higher temperatures, amount of catalyst can be reduced by adding imidazole curing temperature.
Heat-resistant powder coating: is able to withstand long term temperatures above 200 ℃, coating well, and allows objects to be protected in high-temperature environment play a role in normal powder coating. Currently, silicone heat-resistant powder coating powder coating is still based. Mechanism from the polymer in terms of thermal stability, heat resistance of polymers depends on their molecular structure. Thus in the main chain by the introduction of larger or more polar side groups, to increase interaction between molecules, thereby enhancing the thermal stability of polymers. Improve the heat resistance of powder coatings is another way to add heat-resistant polymer pigments and fillers. Pigments and fillers are commonly used in aluminum, mica, stainless steel powder, cadmium powder, silica, boron powder, etc.
Decorative Powder Coating: It features a clear coating the surface with beautiful patterns, objects to the painting to look beautiful and colorful. The mechanism of pattern formation of powder coatings and solvent-based paints have very different patterns between the two forms are also different. Powder coating is mainly produced using the melting characteristics of texture effects, pattern and form and size of the formula composition, preparation process and powder particle size has a lot. At present the main ideas developed in the following ways: the use of incompatible polymers have different levels of flow state, the formation of three-dimensional pattern; different curing rate of the curing agent, due to differences in leveling speed suitable for the formation of wrinkles; different packing, resulting in the leveling of powder coatings, gloss and hue differences, resulting in texture effect; with different size and different shade of metallic pigments to the coating in a different location, different angles, resulting in gloss and hue the difference. Flame retardant powder coating: a flame, flame, heat function. With modern electronics and appliances industry, the rapid development of fire-retardant paint more and more pressing demands, the current main varieties of epoxy coating powder coating. Source:http://www.mhcmp.com