Powder coating is a kind of coating existing in powder solid state, and coating with powder state, heated and melted flat or cured film.
Powder coatings VOC content is low, easy to clear, overspray paint is recyclable; after construction the coating film was substantially no pinholes, was generally easier to work than the liquid paint, the formed coating film with good durability. Powder coating is the 1960s began to develop a coating new varieties, new technologies, has save energy and resources, reduce environmental pollution, simple process, easy to automate, coated durable, pollution-free, high labor productivity, powder is recyclable and other characteristics.
The last 30 years, as countries increasingly strict environmental protection requirements, the traditional solvent-based coatings development was limited, powder coatings as environmentally-friendly paint has considerable development, but we should also clearly to see that, so far, powder coating production also accounted for only 5% of the entire coating, liquid coating also occupy the absolute proportion, up to 95%. In last 10 years, the powder coatings was rapidly developing, a number of new products, new technologies have been developed, low temperature curing powder coatings, super weatherability powder coating, acrylic powder coating, MDF used powder coatings, glass and plastic used powder coating; supercritical technology, metal powder coating technology have been put into the bond market.
Powder coatings can be divided into thermoset and thermoplastic categories. Thermosetting powder coating: have good decoration, corrosion resistance and mechanical properties, mainly used in insulation, corrosion and construction and other aspects. Epoxy powder coating: mainly used in indoor metal furniture products, auto parts and oil and water pipelines. Polyester powder coating: with high gloss, good leveling and other features, generally used for instrument housing, furniture and other fields. Acrylic powder coating: have thermoplastic and thermosetting two kinds. Thermosetting acrylic resin powder coating has excellent weather resistance, color retention, stain resistance, etc., suitable for decorative powder coatings.
Thermoplastic powder coatings were mainly used in mechanical parts, light equipment and other aspects of the food industry. PVC powder coating: has excellent solvent resistance. Mainly used for coating metal mesh panels, steel furniture, chemical equipment and so on. Polyethylene powder coating: has excellent anti-corrosion, electrical insulating properties and resistance to ultraviolet radiation, etc, the disadvantage is the mechanical strength not high, poor adhesion to the substrate. Can be used for chemical pool, tank, automotive parts and so on. Nylon powder coating: non-toxic, tasteless, not mold erosion, suitable for the spraying food industry parts, drinking water pipes and food packaging. Fluororesin powder coating: a fluorine-containing polymer can be prepared many different types of powder coatings, such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride and so on. Polytetrafluoroethylene with high melting point, high corrosion resistance, was used in oil, sealed and non-stick coating. Polychlorotrifluoroethylene applied in anti-corrosion equipment of chemical, pesticide factory. Polyvinylidene fluoride powder coating excellent in weather resistance, and no dust absorption, easy to maintain original luster. Chlorinated polyether powder coating: chlorinated polyether has excellent chemical stability, mechanical and friction performance is also good. The disadvantage is the poor adhesion with metal. Mainly used in chemical, instrumentation equipment shell and so on.
It also includes a metallic pigment coating, there are many varieties of metal pigments can be used for powder coating, generally divided into four categories, namely aluminum silver powder pigments, pearlescent pigments, copper powder pigments and other metallic pigments (such as nickel powder, stainless steel powder).
Source:http://www.mhcmp.com
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