HNBR／EPDM 共混物结构与性能研究

雷昌纯　 张立群　 李洪福　 吴友平　 冯予星　

摘　要：分别采用过氧化物和硫给予体作交联剂，考察了不同共混比对氢化丁腈橡胶(HNBR)／EPDM 共混物性能的影响，并通过 DSC 和 TEM 分析了共混物的相容性，对两胶的共硫化也作了初步探讨。结果表明，两种硫化体系硫化的共混胶扯断伸长率保持率均在 60％以上，都具有优异的耐热氧老化性能。随 HNBR 用量增大，共混物的定伸应力、拉伸强度和撕裂强度均提高，磨耗明显降低。HNBR 和 EPDM 为不相容体系，但硫化仪曲线显示二者硫化速率接近，能较好地共硫化。
关键词：HNBR；EPDM；共混物；相容性
分类号：TQ333．4　文献标识码：A
文章编号：1000-890X(2000)05-0259-04

Study on structure and properties of HNBR/EPDM

LEI Chang-chun ,ZHANG Li-qun ,LI Hong-fu ,WU You-ping ,FENG Yu-xing
(Beijing University of Chemical Technology, Beijing 100029)

Abstract：The influence of the blending ratio on the properties of HNBR/EPDM blend was investigated by using peroxide DCP and sulfur donor DTDM as crosslinking agents respectively, the compatibility of two polymers was analysed by means of DSC and TEM, and their covulcanization was also discussed. The results showed that the elongation retentions after thermal-oxidative aging of the blends cured with two different curing systems respectively were higher than 60%; the modulus, tensile strength and tear strength of blend improved, but the abrasion resistance decreased as the HNBR proportion in the blend increased; and HNBR/EPDM was an uncompatible system, but the curing rates of two polymers were closer on the rheometer curve, therefore the two polymers in the blend could well be covulcanized.
Keywords：HNBR; EPDM; blend; compatibility