Synthesis of epoxy resin/silicone rubber interpenetrating polymer network for ablation thermal protection coating

Silicone modified epoxy resin (EPS) is synthesized through the condensation reaction of methoxy and hydroxy groups, which improves the compatibility of epoxy resin and silicone rubber (SR). EPS and SR are blended and cured at room temperature. Through the self-locking method of chain segments, an EPS/SR interpenetrating polymer network (IPN) with limited microscopic morphology and excellent macroscopic properties is obtained, which effectively solves the problems of Pure SR's low binding force and poor thermal properties. Furthermore, an IPN-based ablation thermal protection coating (ATPC) is also prepared. Compared with the classic SR-based ATPC, the IPN-based ATPC has higher mechanical strength and better ablated surface state, and a stable carbon layer is formed during the ablation process, which is carried out through a coordinated mechanism of thermal blockage and thermal barrier.