English Abstract
Dissolution Behavior in Tap Water of Antioxidant Contained in EPDM and Evaluation of the Rubber Degradation
Yoshihiko SUGIOKA
Hiroto SHIN
INAX CO., LTD., Tokoname, Aichi, Japan
Yoshito OHTAKE
Chemicals Evaluation and Research Institute, Japan, Kitakatsushika-gun, Saitama, Japan
Nippon Gomu Kyokaishi,(2008),81(2),44-50 Original Paper in Japanese

Antioxidant in vulcanized rubber dissolves rapidly when the rubber is immersed in water that contains residual chlorine.
Phenolic type antioxidant that has low solubility is not easy to dissolve compared with amine type antioxidant that has high solubility. Furthermore the dissolution of an antioxidant is controlled by its molecular weight; antioxidant of high molecular weight is not dissolved easily compared with that of low molecular weight. On the other hand, when the antioxidant dissolves more, degradation on the surface of vulcanized rubber progresses gradually. The surface degradation with residual chlorine is prevented by the antioxidant of low solubility.

(Received on April 5, 2007)

(Accepted on December 10, 2007)

Residual Chlorine, Degradation, EPDM, Antioxidant, Dissolution