硅烷接枝二元乙丙橡胶对EPDM/MVQ共混物的改性及改性机理探讨

Modification of EPDM/MVQ with silane-grafting EPM

探讨了硅烷接枝二元乙丙橡胶 (EPM g S)作相容剂对EPDM/甲基乙烯基硅橡胶 (MVQ)共混物的改性及改性机理。EPM g S是EPM、硅烷偶联剂A 174[γ (甲基丙烯酰脱氧基 )丙基三甲氧基硅烷 ]和过氧化物DCP在布拉本德自记硫化仪中 ,通过高温 (170～ 190℃ )、高剪切 (转子转速为 6 0～ 80r·min-1)热炼而成的。用EPM g S作相容剂 ,可以改善EPDM/MVQ共混物的物理性能、耐热性能 (耐热温度从 15 0℃提高到 170℃ )和高温压缩永久变形性能。红外光谱试验证明 ,EPM g S是硅烷偶联剂A 174接枝到EPM分子链上的产物 ,EPDM与MVQ和EPDM与EPM g S是通过过氧化物交联体系共交联的。

The EPDM/MVQ was modified by using the silane grafting EPM (EPM g S) as the compatibilizer and the modification mechanism was discussed.EPM g S was obtained by mixing EPM,silane coupling agent A 174 [γ (methyl acryl deoxy) propyl trimethyl silane] and DCP in a Brabender rheometer at the high temperature (170～190 ℃) and the high shearing (with rotor speed of 60～80 r·min -1 .The physical properties,particularly the heat resistance and the compression set at high temperature of EPDM/MVQ were improved by using EPM g S as compatibilizer.It was found with infra red absorption spectrum that EPM g S was the product of the silane coupling agent A 174 grafted on the EPM molecular chain and the covulcanization of EPDM/MVQ or EPDM/EPM g S was achieved by peroxide crosslinking agent.