可低温固化耐烧蚀涂层织物的制备探讨

Preparation of Low Temperature Curing Organic Silicone Coating Fabric with Ablation Resistant Property

为了改善有机硅树脂活性低,难以低温固化,以及提高涂层织物的耐高温耐烧蚀性能,合成了具有活性的有机硅低聚物,并用环氧树脂对低聚物进行改性。主要研究了苯基含量、单体水解所需水用量、环氧树脂用量等对有机硅低聚物活性和树脂耐烧蚀性能的影响。结果表明:以一甲基三乙氧基硅烷、二甲基二乙氧基硅烷、苯基三乙氧基硅烷为原料,制备有机硅低聚物,最佳合成工艺为R/Si=1.3、Ph∶R=0.3、水用量为反应单体完全水解的60%。用环氧树脂将有机硅树脂进行改性后,当环氧树脂与有机硅低聚物质量比为4∶6,固化剂用量与环氧树脂质量比为0.5∶1.0,在80℃的条件下,涂层织物30 min即可实现固化;对玻璃纤维涂层后,室温条件下72 h内可实现完全干燥。

In order to improve the activity and low curing temperature of organic silicone and increase the high temperature resistance and ablation resistance of coated fabric, silicone oligomer Was synthesized and modified by epoxy resin. The influence of phenyl content, water required for monomer hydrolysis and the usage of epoxy, etc on the activity and ablation resistance of silicone oligomer have been investigated. Results showed that the optimum synthesis process was R/Si =1.3, Ph ： R =0.3 and 60% water content of monomer complete hydrolysis by using methltriethoxysilone, diethoxydimethylsilane and phenyltriethoxysilane as raw materials. Modified by epoxy resin, the coating fabric can be cured at 80 ~C in 30 min when the epoxy resin and silicone oligomer mass ratio was 4 ： 6 and the curing agent and epoxy resin mass ratio was 0.5 ： 1.0 Experiments showed the coating fabric can be completely dried in 72 h at room temperature.