Cure Studies and Cured Properties of Diglycidyl Ether of 4-Methylolresorcinol (A Rapid-Gelling Epoxy Resin).

摘要

Curing was studied of diglycidyl ether of 4-methylolresorcinol (DGEMR), a rapid-gelling epoxy resin synthesized at the Harry Diamond Laboratories. The epoxy, with a built-in catalytic methylol group, can be cured with all types of conventional epoxy hardeners including aliphatic and aromatic amines, anhydrides, polyamidoamines, and polymercaptans. In general, DGEMR gels up to 30 times faster than the regular bisphenol A-type epoxy resins and 2 to 5 times faster than the fastest-gelling commercial epoxies known. Cures with flexible hardeners such as polyamidoamines and polyoxyalkyleneamines were rapid even at -7C. Hardening with m-phenylenediamine was complete at room temperature. Adhesion to aluminum obtained with DGEMR formulations was approximately 50 percent greater than that produced by the conventional bisphenol A-type epoxy. Thus, DGEMR appears to be ideal for adhesive, coating, and low-temperature cure applications, as well as for filled formulations without prolonged gel times. However, the methylol substituent appears to enhance water absorption and results in slightly lower electrical resistivity. (Author)