三元乙丙橡胶J-4090和6950C的结构与性能研究  

Study on Structures and Properties of EPDM J-4090 and 6950C

作　　者：靳紫昊 邹华[1] JIN Zihao;ZOU Hua(Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学北京市新型高分子材料制备与加工重点实验室,北京100029

出　　处：《橡胶工业》2023年第4期272-277,共6页China Rubber Industry

摘　　要：研究2种应用于汽车海绵密封条的牌号为J-4090和6950C的三元乙丙橡胶(EPDM)的微观结构及其复合材料(包括密实胶和发泡胶)的性能。结果表明:与EPDM 6950C相比,EPDM J-4090的乙烯基质量分数较大,第三单体(亚乙基降冰片烯)质量分数较小,相对分子质量分布较宽;与EPDM 6950C密实胶相比,EPDM J-4090密实胶的硫化速率和交联密度较小,抵抗变形的能力较差,硫化体系用量增大20%的EPDM J-4090密实胶的物理性能达到EPDM 6950C密实胶一致的水平。与EPDM 6950C发泡胶相比,硫化体系用量增大20%的EPDM J-4090发泡胶的挤出胀大比略大,发泡特性和物理性能相近。The microstructures of two brands of EPDM(J-4090 and 6950C)used in automobile sponge sealing strips and the properties of their composites(including dense compound and foamed compound)were studied.The results showed that,compared with EPDM 6950C,EPDM J-4090 had larger vinyl mass fraction,smaller mass fraction of the third monomer(ethylidene norbornene)and wider molecular weight distribution.Compared with EPDM 6950C dense compound,EPDM J-4090 dense compound had lower vulcanization rate and crosslinking density,and poor resistance to deformation.However,when the amount of the vulcanization system in EPDM J-4090 dense compound increased by 20%,its physical properties could reach the same level as that of EPDM 6950C dense compound.Compared with EPDM 6950C foamed compound,the extrusion swell ratio of the EPDM J-4090 foamed compound with 20%increase in the amount of the vulcanization system was slightly larger,and the foaming characteristics and physical properties were similar.

关 键 词：三元乙丙橡胶 海绵密封条 密实胶 发泡胶 微观结构 物理性能 发泡特性 挤出胀大比 

分 类 号：TQ333.4[化学工程—橡胶工业] TQ336.42