Thermosetting powder coating refers to the use of thermosetting resin as a film-forming substance, and the addition of a curing agent for cross-linking reaction can form an insoluble and infusible hard coating after heating. At higher temperatures, the coating does not soften like a thermoplastic coating, but only decomposes. Since the resin used in the thermosetting powder coating is a prepolymer with a lower degree of polymerization and a lower molecular weight, the coating has better leveling and decorative properties, and the low molecular weight prepolymer is cured. It can form macromolecules of network cross-linking, so the coating has better corrosion resistance and mechanical properties. Therefore, the development of thermosetting powder coatings is particularly rapid.Epoxy powder coating
. Because of its excellent adhesion to metal, corrosion resistance, hardness, flexibility and impact strength, it is the first variety used in thermosetting powder coatings. The formulation of epoxy powder coating is composed of epoxy resin (Epoxy Resin), curing agent (curing agent), pigment (pigment), filler (filler) and other assistants (assistant). The contributions of these components to the properties of the powder coating formed are mutually restricted and influenced. A suitable formulation is actually the result of the coordination of various components.
Polyester powder coating. Polyester powder coatings have unique properties compared to other types of powder coatings. It is better than epoxy resin in terms of weather resistance and UV resistance. In addition, because polyester resin has polar groups, the powder rate is higher than that of epoxy resin, it is not easy to yellow during the baking process, has high gloss, good leveling, full paint film, light color and other characteristics. Very decorative. Generally used in refrigerators, washing machines, vacuum cleaners, instrument housings, bicycles, furniture and other fields.
Acrylic powder coating. Acrylic resin powder coatings are available in thermoplastic and thermoset. The biggest advantage of thermosetting acrylic resin powder coating is that it has excellent weather resistance, color retention, pollution resistance, strong metal adhesion, and excellent film appearance. It is suitable for decorative powder coatings.