发泡丁腈橡胶-金属复合垫片的发泡体系  

Foaming systems of nitrile rubber foam-metal gaskets

作　　者：王秀猛[1] 邱祖民[1] 郑楠[1] 邱俊明[1] 

机构地区：[1]南昌大学环境与化学工程学院,南昌330031

出　　处：《合成橡胶工业》2014年第1期47-51,共5页China Synthetic Rubber Industry

基　　金：江西省自然科学基金资助项目(20122BAB203021);江西省科技攻关项目(20111BBE50021;20122BBE50036)

摘　　要：采用液态施工法与自由发泡工艺制备了发泡丁腈橡胶-金属复合垫片，基于差热分析探讨了不同发泡剂（AC，OBSH，H，NaHCO3，AK-12，AK-400）作用下丁腈橡胶的发泡效果，并研究了不同用量的发泡剂AC对涂层性能的影响。结果表明，发泡剂的起始分解温度和突发性对涂层泡孔结构的影响较大，发泡剂AC的起始分解温度和突发性与胶料的硫化匹配得较好；草酸能有效地降低发泡剂NaHCO，的分解温度，硼砂能降低发泡剂H的分解温度；发泡剂AC、OBSH及H的分散性较好，而NaHCO3、AK-400及AK-12较差。在发泡剂AC用量为6—8份（质量）时涂层的泡孔为闭孔结构，发泡倍率较高，泡孔密度较大，力学性能优良，适合作为密封材料使用。The nitrile rubber foam-metal gaskets were prepared through the liquid method and free foaming process, based on differential thermal analysis, the efficiency of different foaming agents （AC, OBSH, H,NaHCO3,AK-12, AK-400） used in nitrile rubber was discussed, and the effects of different amounts of foaming agent AC on the coating properties were investigated. The results showed that the burst and initial decomposition temperatures of foaming agent had a great effect on the cell structure of the coating. The burst and the initial decomposition temperatures of foaming agent AC were matched well with the vulcanization of nitrile rubber. Oxalic acid could lower the decomposition temperature of NaHCO3 effectively,and the borax had the same effect on the foaming agent H. The dispersion performance of foaming agent AC, OBSH and H was good, while of NaHCO3, AK-400 and AK-12 poor. Foaming agent AC was suitable for the foam sealing material, since the foamed coating with 6 -8 phr foaming agent AC had closed-cell structure, higher foaming ratio, larger cell density and better mechanical properties.

关 键 词：丁腈橡胶 发泡橡胶 密封材料 复合垫片 发泡剂 

分 类 号：TH136[机械工程—机械制造及自动化]