Catalytic hot-setting of urethane oligomers

Abstract

The polyamide compounds as a curing agent (MOC A) are used for curing to produce synthetic elastomers with programmable properties based on oligomers. It is depermined that MBCA amount in the com position ranges from 11.8 to 19.1 parts by weight per 100 parts by weight polymer depending on the type of urethane rubber. The lifetime of urethane rubber and MOCA during casting at room temperature is about 6–12 minutes. It is shown that a small amount of a carboxylic acid accelerates the curing reaction and reduces the lifetime of the polyurethane rubber in the molding process at room temperature. It is proposed to use adipic acid as the hardening catalyst, while the lifetime of urethane rubber and MOCA is about 6–12 minutes in a molding process at room temperature, and physical and mechanical properties are substantially unchanged. It allows us to obtain molded articles with given set of properties by free casting.