High overload ablation resistant EPDM (Ethylene-Propylene-Diene Monomer) elastic heat insulation material

Abstract

The invention provides a high overload ablation resistant EPDM (Ethylene-Propylene-Diene Monomer) elastic heat insulation material which is prepared from 100 of EPDM, 15 to 20 of aromatic polyamide organic fiber, 5 to 12 of inorganic fiber, 12 to 25 of a silicon dioxide strengthening agent, 3 to 5 of zinc oxide, 5 to 15 of a petroleum based softener, 5 to 20 of an ammonium salt flame retardant, 10 to 30 of deca-brominated diphenyl ether, 5 to 15 of antimonous oxide and 2 to 4 of a peroxide vulcanizing agent, wherein the aromatic polyamide organic fiber is aramid fiber or heterocyclic aramid fiber; the inorganic fiber is asbestos fiber or ceramic fiber; the petroleum based softener is one of liquid paraffin and naphthenic oil. The high overload ablation resistant EPDM elastic heat insulation material is excellent in overload ablation resistance and relatively high in mechanical property and processing property, is applicable to the requirement of a high overload engine for the erosion resistance of an inner heat insulation material; therefore, effective heat insulation is guaranteed, the thickness of a heat insulation layer can be reduced, and the packing factor of the engine is increased.

Description

technical field [0001] The invention relates to an ethylene propylene diene monomer (hereinafter referred to as EPDM rubber) thermal insulation material capable of resisting high overload (40g) ablation, in particular to an EPDM elastic thermal insulation material added with organic fibers and inorganic fibers at the same time. Background technique [0002] In order to improve the combat capability of weapons, some missiles put forward higher requirements on flight acceleration performance and maneuverability, and the design lateral overload is nearly 40g. When the engine is flying with high maneuverability and overload, due to the deflection and accumulation of high-temperature particles, the heat insulation layer in the direction of centrifugal force will be severely ablated, and the ablation resistance of existing heat insulation layer materials is greatly affected by overload acceleration. The layer ablation rate is greatly increased. Therefore, the thickness of the rub...

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Problems solved by technology

Increasing the thickness of the thermal insulation material can achieve the purpose of effective thermal protection for the engine, but at the same time it also reduces the loading factor of the engine and reduces the range of the weapon; while the hard ablation-resistant thermal insulation material generally has poor toughness (the elongation rate is about 10 %), high density (about 1.4g / cm 3 ), and the implementation process is complex

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