What are the characteristics of powder coatings for automobiles?

" powder coating is a solid powdered synthetic resin coating consisting of solid resins and pigments, fillers and additivesUnlike common solvent-based coatings and water-based coatings, its dispersive medium is not solvents and water, but airIt has the characteristics of solvent-free pollution, 100% film, low energy consumptionPowder coatings are thermoplastic and thermosetThermoplastic powder coatings have poor film appearance (gloss and leveling) and poor adhesion to metals, so they are rarely used in automotive coatingAutomotive coating generally uses thermoset powder coating, thermoset powder coating is a thermoset synthetic resin as a membrane substance, in the drying process of resin first melt, after chemical cross-linking curing into a flat hard coating filmThe paint film appearance and various mechanical properties and corrosion resistance formed by this kind of coating can meet the requirements of automotive coatingthe manufacture of powder coatings for automobiles is generally dry (dry mixing and melting mixing), the process is: dry mixing (resin, curing agent, yan filler, additive) - melting mixing , cooling , coarse crushing , fine crushing grade , finished productThe construction method mainly uses electrostatic sprayingGeneral epoxy powder coatings, polyester powder coatings, acrylic powder coatings, epoxy/polyester mixed powder coatings and polyester/polyurethane powder coatingsPowder coatings are currently widely used in automotive components (e.gautomotive chassis, wheels, axles, etc.) and automotive interior and exterior decorationpowder coatings have been used in the automotive field since the early 1970s, and have achieved great success, especially in recent yearsOn the one hand, it greatly reduces VOC emissions, on the other hand, it greatly improves the utilization rate of coatingsHowever, the application of automotive powder coating is mainly in Europe and North America, and in China, the level of automotive powder coating is still far behind, the practical application is very few, the vast majority is limited to aluminum wheel coating, but the development prospects are very broad