Internal thermal insulation material for solid rocket engine, and preparation method and application thereof

The invention discloses an internal thermal insulation material for a solid rocket engine, and a preparation method and an application thereof. The internal thermal insulation material comprises the following components in parts by weight: 95 to 108 parts of silicon rubber, 10 to 50 parts of a reinforcing filling material, 8 to 48 parts of an ablation-resistant filling material, 5 to 10 parts of across-linking agent and 0.5 to 1 part of a catalyst. According to the invention, the selected silicone rubber has the advantages of higher environmental adaptability and better corrosion resistance and aging resistance; through addition of the reinforcing filling material, the ablation-resistant filling material, an antioxidant and a lightening admixture, the internal thermal insulation materialwith good mechanical properties, bonding property and high-temperature ablation resistance is obtained; through selection of amino silane coupling agent modified silicon carbide nanometer powder as the ablation-resistant filli