English Abstract

Improvement of Aging Resisitance of Natural Rubber Vulcanizates Using Vulcanizing Agents

Shigemitsu OTOMO
Ouchi Shinko Chemical Industrial Co. Ltd., Chuo-ku, Tokyo, Japan
Nippon Gomu Kyokaishi,(2014),87(2),33-40 General Review in Japanese

Tire and automobile parts such as fuel hose, rubber packing and timing belt etc. are made of rubber vulcanizates, the improvement of aging resistance of diene rubber vulcanizates is very important theme because of their poor resistance for heat aging and ozone cracking.
This paper reviews the characteristic of various curing system including conventional cure, EV cure, sulfurless cure and soluble cure, and reports the improvement method for both heat aging resistance and fatigue life of natural rubber vulcanizate using vulcanizing agent. The better aging resistance of the natural rubber vulcanizate obtained by soluble cure system can be attributed the low concentration of the polysulfidic crosslink and the better dispersion of sulfur crosslink in the vulcanizate.

Keywords: Vulcanizate, Curing System, Antiaging Resistance, Fatigue Life, Soluble Cure, Ev Cure