A kind of environment-friendly low-density ablation-resistant thermal insulation layer and preparation method thereof

Abstract

The invention discloses an environment-friendly thermal-insulating layer with low density and ablation resistance and a preparation method of the environment-friendly thermal-insulating layer. The environment-friendly thermal-insulating layer is prepared from components as follows: 100 parts of nitrile rubber, 20-40 parts of silicon dioxide, 6-15 parts of metal oxide, 5-20 parts of nano-carbon filler, 10-20 parts of polyphenylene sulfide resin, 10-30 parts of heat-resistant fibers, 1-2 parts of stearic acid, 2-3 parts of sulfur and 1-3 parts of a promoter with a two-roll milling and hot pressing vulcanization molding technology. The adopted raw materials contain no halogen or asbestos fibers, and the ablation resistance of the thermal-insulating material is remarkably improved because of the use of the nano-carbon filler as a flame retardant and the polyphenylene sulfide resin, silicon dioxide and the like as stabilizers as well as the cooperation with other additive systems such as metal oxide, the heat-resistant fibers and the like; the thermal-insulating layer has excellent overall performance and is applicable to the thermal protection field requiring resistance to high-temperature ablation and particularly applicable to the technical field of thermal protection for ablation at instantaneous high temperature.

Description

technical field [0001] The invention relates to the technical field of ablation-resistant materials, in particular to an environment-friendly low-density ablation-resistant heat insulation layer and a preparation method thereof. Background technique [0002] The inner insulation layer of the solid rocket motor is an important part of the engine combustion chamber. It is mainly made of raw materials such as rubber base material, reinforcing filler, flame-retardant fiber and vulcanizing agent. Its main function is to take away Most of the heat is used to resist the ablation and erosion of the engine casing by the high temperature and high pressure gas generated by the combustion of solid propellants, to ensure the integrity of the engine casing structure, and ultimately to ensure the normal operation of the engine. [0003] At present, the heat insulation layer is mainly based on nitrile rubber (NBR) and ethylene propylene diene monomer (EPDM), and EPDM has been widely used in...

AI Technical Summary

Problems solved by technology

However, after adding asbestos, there are problems such as high density, complicated processing, and difficulty in uniform dispersion. At the same time, asbestos has carcinogenic properties and the working environment is relatively harsh.

In addition, the NBR insulation layer has the disadvantages of high density, high oxyacetylene ablation rate and high smoke characteristic signal, and its density is generally greater than 1.25g / cm 3 , seriously increasing the negative mass of solid rocket motors, and the ablation rate of oxyacetylene wires is generally greater than 0.15mm / s, which is difficult to meet the ablation resistance of solid rocket motors, and halogen-containing flame retardants are generally used to improve their flame retardancy, seriously Reduced low-characteristic variants of solid rocket motors

Images