Лако-красочные материалы — производство

In contrast to alkyd resins, which have unsaturated fatty acid struc­tures capable of yielding a cross-linked network by air-drying via oxidative curing, polyesters need to be cured by a suitable external cross-linking agent to obtain the desired mechanical properties as well as durability and chemical resistance. Depending upon expected performance and application conditions, a range of curing agents is used, including amino resins, polyisocyanates and epoxy resins. Some important cross-linking reactions of polyester systems are shown in Figure 2.15 and Figure 2.16.