Лако-красочные материалы — производство

Powder coatings are an important technology that offers 100 % solid products with practically zero volatile emissions. Polyester resins for powder coating are friable solids with a relatively high Tg (50 to 60 °C) to avoid sintering of particles during storage. They are commonly prepared from terephthalic acid and neopentyl glycol as the principal monomers, though other monomers are also used as required for functionality and balancing of Tg. Isophthalic acid — based polyesters are believed to give better exterior durability. Both hydroxyl and carboxyl functional polyesters are used in powder coatings. Hydroxyl functional polyesters, commonly cross-linked with blocked isocyanates, and carboxyl functional polyesters are cured with epoxy resins.