Thermosetting powder coatings use thermosetting resin as the film-forming substance, adding a curing agent for cross-linking reaction to form an insoluble and infusible hard coating after heating. The thermosetting powder coatings commonly produced by powder coating manufacturers can be divided into the following Four kinds.
1. Thermosetting polyester powder coating
The unique properties of thermosetting polyester powder coatings are weather resistance and UV resistance better than epoxy resin. In addition, because polyester resin has polar groups, it has a higher powdering rate than epoxy resin, it is not easy to yellow during baking, high gloss, good leveling, full paint film, light color and other characteristics, so it has the characteristics of Very decorative. Generally used in refrigerators, washing machines, vacuum cleaners, instrument housings, bicycles, furniture and other fields.
2. Thermosetting epoxy powder coating
Thermosetting epoxy powder coatings are composed of epoxy resin, curing agent, pigments, fillers and other additives. It is the earliest developed type of thermosetting powder coatings. It has excellent adhesion to metals, corrosion resistance, hardness, and flexibility. And impact strength, widely used in all walks of life.
3. Thermosetting polyurethane powder coating
Thermosetting polyurethane powder coatings are highly decorative, smooth and tough, while taking into account outdoor weather resistance and corrosion resistance. It is currently one of the best weather resistance powder coatings in China.
4. Thermosetting epoxy polyester powder coating
The thermosetting epoxy polyester powder coating made of polyester resin and epoxy resin with carboxyl group as base material, combined with pigments, fillers and other ingredients, is currently the world's most widely used and largest production powder coating variety .
Because the resin used in thermosetting powder coatings is a prepolymer with a low degree of polymerization, the molecular weight is low, the coating has good leveling properties, and has good decorative properties, and the low molecular weight prepolymer is cured , Can form a network of cross-linked macromolecules, so the coating has good anti-corrosion and mechanical properties. It is the most representative powder coating of powder coating manufacturers.