硫化剂双25对三元乙丙橡胶/乙烯-辛烯共聚物共混胶动态性能及耐热老化性能的影响

Influence of 2,5-Dimethyl-2,5-bis-(tert-Butylperoxy) Hexane on Dynamic Property and Heat Aging Resistance of EPDM/POE Blend

采用橡胶加工分析仪(RPA)分析硫化剂双25对三元乙丙橡胶(EPDM)/乙烯-辛烯共聚物(POE)共混胶动态性能及耐热老化性能的影响。结果表明,硫化剂双25用量不同的混炼胶的动态性能之间差异较小,而硫化胶因交联密度不同,动态性能差异较大。EPDM/POE混炼胶和硫化胶的储能模量随频率升高而增大,随应变和温度升高而减小;混炼胶的损耗因子随频率升高而降低,随应变及温度升高而增大;硫化胶的损耗因子对频率的依赖性不明显,随应变升高而增大,随温度升高而降低。硫化剂双25用量不同的硫化胶经过RPA无氧高温老化后,损耗因子增大;当硫化剂双25用量为3.5份时,硫化胶的损耗因子在老化前后都较小,耐热老化性能最好。

The influence of 2,5-dimethyl-2,5-bis-（tert-Butylperoxy） hexane（DBPH）on the dynamic property and heat aging resistance of EPDM/polyolefin elastomer（POE） blend was investigated by using rubber processing analyzer（RPA）. The results showed that,the dynamic property of the compounds with different addition level of DBPH was similar,but the vulcanizates had different dynamic property when the crosslinking density was different. The storage modulus of EPDM/POE compounds and vulcanizates increased with the increase of frequency,and decreased with the increase of strain and temperature. The loss factor of EPDM/POE compounds decreased with the increase of frequency,and decreased with the increase of strain and temperature. The loss factor of EPDM/POE vulcanizates slightly depended on the frequency,increased with the increase of strain,and decreased with the increase of temperature. The loss factor of EPDM/POE vulcanizates with different addition levels of DBPH increased after high temperature aging without oxygen by RPA. The loss factor of the vulcanizate with 3. 5 phr DBPH was low before and after aging,showing good heat aging resistance.