水道水中での加硫ゴム中の老化防止剤の分布と劣化

概要

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The relationship between distribution of antioxidant and degradation of polymer is investigated on EPDM compounded with IPPD that is a typical amine type antioxidant for vulcanized rubber. IPPD in EPDM homogeneously-dispersed by kneading is used. Because of decomposition by heat while molding and volatilization from surface of vulcanized rubber, more IPPD exists inside of rubber than the surface. At the depth of 0 ~ about 50μm, percolation of water contained with residual chlorine and polymer degradation occur at the same time, IPPD disappears because of its dissolution into the water and consumption by trapping radical generated polymer degradation caused by residual chlorine and heat. In this area the rubber degradation occurs easily, so almost on the surface oxidation degradation progress even though antioxidant exists enough in vulcanized rubber.
2009-09-10