耐热添加剂对硅橡胶阻燃性能的影响  

Effect of Heat-resistant Additive on Flammability of Silicone Rubber

作　　者：赖亮庆[1] 苏正涛[1] 钱黄海[1] 王景鹤[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2011年第5期66-70,共5页Journal of Aeronautical Materials

摘　　要：采用氧指数、TGA-DSC以及SEM等分析方法,研究了耐热添加剂对硅橡胶阻燃性能的影响。研究表明,耐热添加剂Fe2O3,CeO2和TiO2可提高硅橡胶的耐热空气老化性能和阻燃性能,300℃高温老化对硅橡胶的阻燃性能影响不明显。耐热添加剂能抑制硅橡胶侧链基团的氧化断裂,提高起始分解温度30℃以上,降低分解释放热62%以上。燃烧灰烬中SEM分析表明,耐热添加剂是通过消除自由基的机制,阻止了氧对硅橡胶侧基的攻击,从而明显减轻硅橡胶的热分解,提高了阻燃性能。The effect of heat-resistant additive on flammability of silicone rubber was investigated by analysis method such as Oxygen Index,TGA-DSC and SEM.It is found that the heat-resistant additives Fe2O3,CeO2 and TiO2 improve the hot air ageing properties and flame-resistance of silicone rubber,but the effect of 300℃ hot air on flammability of silicone rubber is indistinct.Heat-resistant additive inhibits oxidized breakage of the pendant group of silicone rubber,and the initial decomposition temperature is increased more than 30℃,and the decomposition release heat is decreased about 62%.The SEM of combustion results show that through the mechanism of eliminating free-radical,heat-resistant additive can inhibit oxygen from attacking to the pendant group,thereby reducing the decomposition of silicone rubber obviously and improving the flammability of silicone rubber.

关 键 词：硅橡胶 耐热添加剂 阻燃性能 

分 类 号：TQ333.93[化学工程—橡胶工业]