Overview of anhydrides curing agent

Organic anhydride curing agent also belongs to addition polymerization curing agent As early as 1936, Dr Pierre castan in Switzerland began to use phthalic anhydride cured epoxy resin as denture material The curing agent of anhydrides is still the main use of this kind of curing agent until now In recent years, with the development of electrical and electronic industries, anhydrides curing agents have been widely used in small and medium-sized electrical appliances Especially in the field of weak current, it has been paid enough attention, such as the package of integrated circuit, the package of capacitor and so on In the aspect of coating, such as powder coating, this kind of curing agent is also paid attention to Compared with other curing agents, anhydrides have the following advantages: 1 Less volatile, less toxic and less skin irritation 2 The compatibility of epoxy resin is large, and the viscosity is low when it is mixed with epoxy resin More fillers can be added for improvement, which is beneficial to reduce the cost 3 The application period is long and the operation is convenient The properties of the cured products are as follows: 1 Slow curing reaction and low shrinkage; 2 High thermal deformation temperature, excellent heat resistance and light color of the cured products; 3 Excellent mechanical and electrical properties However, the curing temperature of the anhydride curing agent is relatively high, and the curing cycle is relatively long; it is not easy to modify; it is easy to absorb moisture and generate free acid when it is stored (the curing speed is slow, and the performance of the solidified product is reduced); the alkali resistance and solvent resistance of the solidified product are relatively poor