三元乙丙橡胶室内外老化行为及相关性分析

目的 研究三元乙丙橡胶(EPDM)的室内外老化机制及其相关性.方法 开展户外拉萨、漠河、吐鲁番、万宁、武汉等站点及室内氙灯加速老化试验,通过分析表观、力学、化学结构等性能,探究EPDM室内外老化行为相关性及加速比.结果 EPDM室内外环境中老化规律为,光泽度初期迅速下降,后期趋于稳定;老化初期色差上升,后期逐渐下降.撕...

Correlation Analysis and the Aging Behaviors of Ethylene-propylene-diene Monomer in Xenon Lamp & Atmospheric Environments

To study the indoor and outdoor aging mechanism of EPDM, Ethylene-propylene-diene monomer (EPDM) was carried to outdoor atmospheric environments (Lhasa, Mohe, Turpan, Wanning and Wuhan) for outdoor nature atmosphere exposure tests and indoor xenon lamp accelerating aging test. The aging behaviors of EPDM including surface properties, mechanical properties and chemical structures were analyzed to evaluate the correlation between indoor and outdoor environment aging behaviors and acceleration ratio. The results showed that the aging rule of EPDM indoor and outdoor environment:glossiness reduced firstly and became stable later; chromatic aberration increased early and then decreased; the tensile strength and tear strength properties in Lhasa, Mohe and indoor environment raised fluctuantly and then decreased gradually; the carbonely groups were found in EPDM in Lhasa indoor environment test, while the hydroxy were not discovered there. The aging behaviors of EPDM from indoor environment were high correlated with Lhasa, whose relation coefficient was calculated as 0.92. Based on the first order dynamic equation and the light loss rate curve of EPDM, the acceleration ratios between indoor and Lhasa, Turpan, Wanning and Wuhan tests were calculated to be 43, 82, 45, 31 respectively.