摘要
根据纳米材料的优异阻燃性能和蒙脱土对聚合物材料的瓷化阻燃作用,提出了EPDM橡胶绝热材料新的研究方向——碳层的可瓷化。在EPDM橡胶中添加熔点较低的有机改性纳米蒙脱土后,蒙脱土在燃气流的烧蚀与冲刷作用下发生熔融,形成的黏性液体可以与裂解碳层发生物理交联,阻挡裂解气体的挥发和碳层的脱落,达到提高绝热材料抗烧蚀、抗冲刷性能和降低烟雾信号的目的。结果表明:蒙脱土与SiO2的用量比在13∶27时各项性能最优,此时,烟雾信号比未添加蒙脱土的提高约50%。
A new trend-carbide ceramifiable thermal insulation is proposed,which based on the excellent performances of nano-composites,such as flame-retardant and ceramification of montmorillonite on polymers.After the adding.low-melting point organic-modification nano montmorillonite is ablated and blowed by the high temperature combustion gas,a kind of viscous liquid can be formed and it will inter-crosslink with the decomposed char layer,blocking the volatilization of the pyrolysed gas and exfoliation of the resulted char-layer,as a result,the performances such as ablation,erosion-resistance and smoke signals will be improved.The results indicate that the performances of the thermal insulation are all optimized under the condition of the ratio of nano-montmorillonite to silica is 13∶27,meanwhile,the smoke-signals increased 50％.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2014年第3期25-30,共6页
Aerospace Materials & Technology
关键词
EPDM
可瓷化
绝热层
蒙脱土
特征信号
EPDM
Ceramification
Thermal insulation
Montmorillonite
Smoke-signal
