Powder coatings are solid powder synthetic resin coatings composed of solid resins, pigments, fillers and additives. Different from common solvent-based coatings and water-based coatings, its dispersion medium is not solvent and water, but air. It has the characteristics of no solvent pollution, film formation and low energy consumption. There are two main categories of powder coatings: thermoplastic and thermoset. Thermoplastic powder coatings have poor film appearance (gloss and leveling) and poor adhesion to metals, so they are rarely used in the field of automotive painting. Thermosetting powder coatings are generally used in automotive coatings. Thermosetting powder coatings are The thermosetting synthetic resin is used as the film-forming material. During the drying process, the resin is first melted, and then cured into a flat and hard coating film after chemical cross-linking. The appearance of the paint film formed by the coating, various mechanical properties and corrosion resistance can all meet the requirements of automobile finishing.