Powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler and auxiliaries.
Different from ordinary solvent – based coatings and water-based coatings, its dispersion medium is not solvent and water, but air. It has no solvent pollution, 100% film formation, low energy consumption characteristics.
Powder coatings are thermoplastic and thermosetting two categories.
- Thermoplastic powder coating film appearance (gloss and leveling) is poor, and the adhesion between the metal is poor, so it is rarely used in the field of automobile coating.
- Thermosetting powder coating is based on thermosetting synthetic resin as film forming material. In the drying process, the resin is melted first, and then cured into smooth and hard film after chemical crosslinking. The film appearance, mechanical properties and corrosion resistance of this kind of coating can meet the requirements of automobile coating, automobile coating generally adopts thermosetting powder coating.