室温固化-高温反应增强型硅橡胶涂料OACSTPCD

In view of the external thermal protection requirements of solid rocket motor,silicone rubber coating cured at room temperature and further enhanced by high-temperature reaction was prepared.In this study,α,ω-dihydroxypolysiloxane was used as the matrix resin,adding phenolic resin powder and other ablation resistant fillers.The effects of the molecular chain length of polysiloxane and the content of phenolic resin powder on the performance of ablation resistant coating were studied.Furthermore,the formulation was optimized to prepare silicone rubber coating with low density,good thermal insulation and ablation resistant.The performance of the coating was characterized by mechanical performance analysis,thermophysical constant test,thermogravimetric analysis,scanning electron microscopy and oxygen acetylene flame ablation.Phenolic resin powder can significantly improve the mechanical properties and ablation resistance of the coating.The coating has the characteristics of cure at room temperature and enhancement by high-temperature reaction,with a double crosslinking network structure.Through the optimization of the formulation,heat insulation and ablation resistant coating with excellent comprehensive performance has been obtained,which has the characteristics of curing at room temperature,low density,good thermal insulation,strong adhesion to the substrate,excellent mechanical properties,ablation resistance,high temperature resistance and easy application.