耐低温无石棉绝热层研制

Preparation of Low Temperature-Resistant and Non-Asbestos Insulation

通过添加含卤-锑的阻燃剂、芳纶纤维和增塑剂,研制了一种耐低温无石棉的丁腈绝热层配方（TI506）.研究了芳纶纤维和增塑剂对绝热层静态烧蚀性能和Tg的影响,对绝热层材料力学性能、比热容、热导率等性能进行了测试.结果表明：芳纶纤维浆粕用量为10～15份、芳纶短纤维用量为4～6份时,绝热层烧蚀性能最佳,线烧蚀率达到45 μm/s,所选增塑剂DOS用量为10份、DBP或ATBC用量为20份时,Tg可达-40℃,芳纶纤维制备的丁腈绝热层力学性能及烧蚀性能优良,并满足固体火箭发动机耐-40～60℃的环境.

A low temperature-resistant and non-asbestos NBR insulation formula named TI506 was preparation by using fire retardant agent containing halogen-Sb,aramid fiber and plasticizer.The effect of content of aramid fiber on erosion perfomance of the insulation was investigated.The effect of content of plasticizer on glass transition temperature （Tg） of NBR insulation was also studied.The results showed that the optimum linearosion rate is 45 μm/s when the content of aramid fiber pulp is 10 to 15 portions and the content of aramid fiber staple is 4 to 6 portions,and when the content of plasticizer DOS is 10 portions,DBP or ATBC is 20 portions,Tg of the NBR insulation can reach-40℃.In addition,mechanical performance,specific heat capacity and conduction coefficient were tested respectively.The results showed that mechanical and erosion perfomances of the NBR insulation by using aramid fiber are excellent,and it made solid rocket engines endure the condition with the temperature from-40℃ to 60℃.