高性能特种弹性体的拓展(三)——硅橡胶(续完)

Expansion of High Performance Elastomers(Part 3)—Silicone Rubber(the End)

综述近年来在非轮胎橡胶制品领域拓展应用的一些具有特殊性能和特种用途、能在苛刻条件下使用的高性能特种弹性体。本综述第3部分报道近年来高性能硅橡胶领域的一些研究和应用进展。添加新型热稳定剂(气相法二氧化钛)和耐热增效剂(3价金属-有机硅络合物)可以显著提高硅橡胶的耐高温性能。低苯基硅橡胶是比目前通用的甲基乙烯基硅橡胶耐高低温性能更优异的硅橡胶,可在-70~250℃空气环境中长期使用,也可在300℃下短期使用。采用集中交联技术可获得高撕裂强度甲基乙烯基硅橡胶。概述陶瓷化硅橡胶的组成和陶瓷化过程,简述国内在瓷化体系(成瓷填料和助溶剂)以及阻燃陶瓷化硅橡胶方面的研究状况。介绍加成型液体硅橡胶的基本组成、功能性添加剂和交联反应原理及其在输配电用复合绝缘子中的应用。

Several high-performance specialty elastomers with special properties which can be applied in the field of non-tire rubber products and used under harsh environments in recent years are reviewed. Part 3 of this review reports some progress in the research and application of high-performance silicone rubber in recent years. Adding a new type of thermal stabilizer(fumed titanium dioxide) and a high temperature resistant synergist(trivalent metal-organosilicone complex) can significantly improve the high temperature resistance of silicone rubber. Phenyl silicone rubber with low phenyl content is a rubber with better high and low temperature resistance than the current general methyl vinyl silicone rubber. It can be used for long-term in a hot air environment of 250 ℃ and for short-term at 300 ℃,and it can be used for long-term under the low temperature of-70 ℃. In another progress,methyl vinyl silicone rubber with high tear strength can be obtained by use of concentrated crosslinking technology. This paper also summarizes the composition and ceramifying process of ceramifying silicon rubber,and briefly discusses the research status of ceramifying system(ceramic filler and solvent) and flame-retardant ceramifying silicone rubber in China. In addition,the basic composition,functional additives and cross-linking reaction principle of addition type liquid silicone rubber and its applications in composite insulators for power transmission and distribution are introduced.