Although the application of PU resin (polyurethane resin) in powder coatings is not as extensive as epoxy or polyester resin, its unique properties make it important in certain specific fields. PU resin powder coatings usually use hydroxy polyester resins and blocked isocyanate curing agents (such as HDI, IPDI, etc.) to react. The blocking agent is released during the curing process to form a cross-linked structure. It has excellent weather resistance, decorative properties, chemical resistance and mechanical properties. It has important applications in the fields of automobiles, outdoor facilities, home appliances, etc. Despite its high cost, its performance advantages make it one of the preferred resins for high-end powder coatings.