甲基丙烯酸锌对EPDM的补强作用

Reinforcement of EPDM with zinc dimethacrylate

研究了在过氧化物硫化体系中 ,甲基丙烯酸锌 [Zn(MAA) 2 ]和硫化剂DCP的用量对EPDM胶料性能的影响。试验结果表明 ,Zn(MAA) 2 用量的增大对EPDM胶料粘度的影响不大 ,但可显著提高硫化速度和硫化程度 ;随着Zn(MAA) 2 用量的增大 ,EPDM硫化胶的邵尔A型硬度逐渐增大 ,拉伸强度和扯断伸长率都是先升高再下降。当硫化剂DCP用量为 1 0份时 ,EPDM硫化胶具有最佳的综合性能。Zn(MAA) 2 的补强效果与EPDM的物理化学性质有关 ,乙烯质量分数和第三单体ENB质量分数高时补强效果好。

The effect of the addition levels of zinc dimethacrylate [Zn(MAA) 2] and DCP on the properties of peroxide cured EPDM was investigated.The test results showed that the curing rate and curing degree of EPDM increased significantly without affecting its viscosity as the addition level ofZn(MAA) 2 in EPDM compound increased;and at the same time the Shore A hardness of EPDM vulcanizate increased gradually and its tensile strength and elongation at break increased at first,and then decreased.The optimum comprehensive properties of EPDM vulcanizate were obtained when 1 phr of DCP was used.The reinforcing effect of zinc salt was relative to the intrinsic properties of EPDM,and high proportions of ethylene and diene were favorable for good mechanical properties of EPDM vulcanizate.