丙烯酸酯橡胶/乙烯-甲基丙烯酸酯弹性体(ACM/EMA)共混研究

Study on Acrylate Rubber/Ethylene-methacrylate Elastomer(ACM/EMA) Blend

研究了丙烯酸酯橡胶/乙烯-甲基丙烯酸酯弹性体(ACM/EMA)并用比对硫化胶的硫化特性、力学性能、耐热老化性能和耐油性能的影响。结果表明:随着ACM/EMA并用比的减小,硫化胶的交联密度先减小后增大,对焦烧时间影响不大,并用胶的硫化速率先减小后增大,硫化胶的硬度逐渐增大,拉伸强度和100%定伸应力先基本不变后逐渐增大,撕裂强度逐渐变大,硫化胶的质量变化百分数和体积变化百分数均逐渐增大,硫化胶的耐油性能变差;EMA/ACM并用,并没有使ACM胶料的热老化性能变差;硫化剂DCP(过氧化二异丙苯)和TCY(三聚硫氰酸)并用时,在硫化过程中会相互反应,并降低胶料硫化程度,同时产生H_2S气体,造成硫化胶表面产生气泡。

The influence of ACM/EMA blending ratio on the curing characteristics, mechanical properties,heat aging stability and oil resistance of vulcanizate were investigated. The results show that with EMA/ACM blending ration decreasing,the vulcanizate of erosslinking density decreased first and then increased, the scorch time was not affected,curing rate decreased first and then increased ;the vulcanizate of hardness increased gradually,tensile strength and modulus at 100% basically remain unchanged first and then increased gradually, tear strength increased gradually, volume change ratio and mass change ratio of vulcanizate increased gradually, oil resistance of vulcanizate got worse;the heat aging stability of vulcanizates did not get worse after EVM being applied in NBR;vulcanizing agent DCP and TCY reacted during curing process and reduced the curing degree of vuleanizates and generated H2 S,caused bubbles in the surface of vulcanizate.