挤出发泡MVQ海绵的结构与性能  

Structure and Property of Extruded MVQ Sponge

作　　者：赵祺[1] 芦艾[1] 余凤湄[1] 魏刚[2] 

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621900 [2]西华大学材料科学与工程学院,四川成都610039

出　　处：《橡胶工业》2011年第12期734-738,共5页China Rubber Industry

基　　金：中国工程物理研究院科学技术发展基金资助项目(2010B0302038)

摘　　要：采用挤出发泡方法制备甲基乙烯基硅橡胶(MVQ)海绵,研究白炭黑、硫化剂和发泡剂用量对MVQ海绵泡孔结构和性能的影响。结果表明:MVQ海绵中含有大量闭孔结构,不同密度海绵的泡孔尺寸及分布密度存在差异;采用较低用量的白炭黑和发泡剂、较高用量的硫化剂可以得到密度和硬度较大的MVQ海绵;MVQ海绵的压缩应力松弛率随着密度的增大呈现先增大后减小的趋势,在密度为0.61Mg.m-3时达到极大值18%;在低应力区域内,密度较大的试样应力增幅比密度较小的试样大。The MVQ sponge was prepared by extruding and chemical blowing,and the influence of addition level of silica,blowing agent and curing agent on the cell structure and properties of the silicone sponge was investigated.The results showed that MVQ sponge contained large amount of closed cells,and sponges with different density had different cell structure and distribution.The silicone sponge with higher density and hardness was obtained when lower addition level of silica and blowing agent,higher addition level of curing agent were used.The compression stress-relaxation of MVQ sponge increased at first and then decreased as the density increased,and the maximum compression stress-relaxation was 18% as the density was 0.61 Mg·m-3.The compression stress of silicone sponge with higher density increased more rapidly than that of silicone sponge with lower density at low stress range.

关 键 词：甲基乙烯基硅橡胶 挤出 发泡 海绵 应力松弛 

分 类 号：TQ337.3[化学工程—橡胶工业]