Effect of Heat-resistant Additive on Flammability of Silicone Rubber
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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.Abstract: 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.
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Key words:
- silicone rubber /
- heat-resistant additive /
- flammability
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