TOOTHED BELT WITH HEAT RESISTANT BENDING FATIGUE PERFORMANCE

摘要

PROBLEM TO BE SOLVED: To obtain an excellent heat resistant property and a heat resistant bending fatigue performance by using a polyurethane estramer consisting of the combination of prepolymer consisting of a specific material with ether.ester system plastic agent and a hardening agent. SOLUTION: A paraphenirene diisocyanate and a polyurethane estramer consisting of the combination of a prepolymer consisting of one kind or two kinds or more of polyester system polyol, polyether system polyol and polycarbonate system polyol with ether.ester system plastic agent and hardening agent is used. The polyester system polyol is the condensation of polycarbone acid and low molecule polyol, whose molecular weight is about 500-10000 and polyether system polyol is obtained by a ring opening additional polymerization by making an alkyrene oxid and active hydrogen alcohol (polyhydric alcohol) to an initiator. Polycarbonate system polyol is the condensation of polyol (polyhydric alcohol) and phosgene.