三元乙丙橡胶汽车密封条着色污染的测试与分析

Test and Analysis of Staining Pollution of EPDM Automobile Sealing Strip

研究三元乙丙橡胶(EPDM)汽车密封条对车身油漆着色污染的测试方法,分析着色污染原因。结果表明:与VDA 675242推荐方法和恒温恒湿环境模拟测试法相比,湿热交变模拟测试法能够有效判别EPDM密封条导致车身油漆黄变的潜在风险;EPDM密封条对车身油漆的着色污染以高湿度环境中水抽提污染为主;高着色性促进剂的残留和析出是导致EPDM密封条着色污染的关键因素。

The test methods of the paint staining of ethylene propylene diene monomer rubber(EPDM)automobile sealing strip were studied,and causes were analyzed.The results showed that,compared with the VDA 675242 standard method and constant temperature and humidity simulation test method,the temperature and humidity cycling test method could effectively identify the potential staining risk.The water extraction pollution was the main reason for the staining pollution in high humidity environment,and the residual and separation of accelerators with a high staining tendency contributed most to the staining pollution of EPDM sealing strip.