Addition-type room temperature vulcanized silicone rubber external heat-resistant material for engine and preparation method thereof

Abstract

The invention provides an addition-type room temperature vulcanized silicone rubber external heat-resistant material for an engine and a preparation method thereof. The material is prepared from 100 parts by weight of base rubber, 4-6 parts by weight of a crosslinking agent, 0.1-0.4 parts by weight of a catalyst, 20-40 parts by weight of a reinforcing filler and 20-40 parts by weight of an ablation-resistant filler. The material solves the problem that the existing resin material in the missile engine external heat-resistant field has poor heat-insulating properties and the condensed silicone rubber polycondensation produces a small molecule. Through use of a large amount of the ablation-resistant filler in the base of the addition-type room temperature vulcanized silicone rubber, good mechanical and ablation performances are obtained. The addition-type room temperature vulcanized silicone rubber external heat-resistant material can be used in the field of missile engine external heat resistance.

Description

technical field [0001] The invention relates to an addition-type room temperature vulcanized silicone rubber outer heat-proof material for engines, in particular to an addition-type room temperature vulcanized silicone rubber material used for missile engine outer heat protection, and belongs to the field of missile engine outer heat protection. Background technique [0002] With the increase of the range of the missile aircraft, the hot air flow generated by the friction between the engine shell and the air during the flight is 300-400°C, which will affect the interface bonding between the engine and the grain and the combustion of the grain. Therefore, it is necessary to Provide external thermal protection for the long-distance flight engine casing, the rubber material has a low thermal conductivity, which reduces the heat conduction of the hot air flow to the surface of the casing. Thermally vulcanized rubber materials cannot be used for external heat protection of engine...

AI Technical Summary

Problems solved by technology

At present, there are condensation-type RTV silicone rubber materials used in the field of engine heat protection, but this type of silicone rubber will release small molecules during vulcanization to affect the performance of the material, and mostly use water vapor in the air as a vulcanization aid or through epoxy resin, phenolic The resin is modified, and there are problems in deep vulcanization

In the prior art, addition-type room temperature vulcanized silicone rubber is mostly used in the fields of potting, coating and flame limitation, but has not been used in the field of missile engine heat protection, and the process of preparing this type of material through open refining has not been reported.

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