A Consideration of Degradation Mechanism of a Effect of the Nitric Solution on the Aging Characteristics of the Outdoor Silicone Rubber

열화 메커니즘 규명을 위한 옥외용 실리콘고무의 산성비 성분 열화특성 연구

In this paper, aging characteristics of outdoor silicone rubber insulator resulting from the acid rain have been investigated with regards to nitrate ion $({NO_{3}}^{-1})$. For this purpose, silicone rubber was aged by immersing into the nitric solutions with different level pH during 1500 hours and various tests (tracking, $tan{\delta}$, breakdown voltage, SEM, EDS, contact angle) were performed. It was observed that the degradation was increased to pH 2.5 slightly and at pH 1.5 highly. And thus, it could be expected that there is certain critical point between pH 1.5 and 2.5, which leads to throught degradation.