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China Coatings Online News Information: Polyurethane powder coating as a powder coating, with many excellent performance, its coating film gloss, good decorative performance, strong wear resistance, good adhesion, but also has good weather resistance, corrosion resistance, electrical properties and mechanical properties, it can be said that it takes into account the advantages of epoxy and acrylic powder coatings, but also than pure polyester powder coating has non-toxic advantages. The powder coating offers its advantages in many applications, including industry, agriculture, transportation, and aerospace.
composition of polyurethane powder coating
polyurethane powder coating with hydroxy polyester resin and closed isocyanate curing agent as the base material, add leveling agent, pigment filler, etc. after mixing, melting, extruding, crushing. Isocyanate, which is in a closed state when the coating is baked, is unsealed and released for curing. The whole curing reaction is indicated as follows: the composition and characteristics of
polyurethane powder coatings
isocyanate can react with any compound containing active hydrogen, in addition to the above-mentioned and hydroxyl-produced amino acid, but also with the production of methylamide, with water, amines, pyridine, urethane and amine, etc.
Characteristics of polyurethane powder coatings
In addition to the generality of conventional general-purpose powder coatings, polyurethane powder coatings also have the following characteristics:
1 powder coating melting flow usually low melt viscosity, coating film leveling is good. In particular, the closure agent before unsealing the chemical reaction, so that the coating has enough leveling time, easy to get a smooth smooth coating.
2 to the coating is good, generally do not need to apply primer.
3 coating preparation range is wider than pure polyester powder, by changing the resin structure and hydroxyl value, closed polyurethane resin content, can be made of different performance requirements and curing speed changes of powder coating, powder coating color matching performance is good.
4 coatings after filming physical mechanical performance and chemical resistance performance is excellent.
5 aromatic isocyanate curing powder coating anti-corrosion is good, suitable for in-house use; The weather resistance of the adipose isocyanate curing powder coating is good and suitable for outdoor high decoration.
6 coating construction is good, mainly by electrostitive powder spraying method construction.
of polyurethane powder coatings is that when the oven is cured into film, the release of a closed agent, resulting in environmental and atmospheric pollution. In addition, when the coating film is too thick, the release of the closed agent is prone to pinholes or bubbles. To this end, to minimize the amount of closed agents, reduce emissions to the atmosphere, while considering the use of non-toxic closed agents.