Benzoxazine resin-based reinforcing fiber composite material and forming method thereof

Abstract

The invention provides a benzoxazine resin-based reinforcing fiber composite material and a forming method thereof. The method includes steps: dissolving, by weight, 50-70 parts of benzoxazine resin and 30-50 parts of ammonia phenolic resin into a ketone solvent in equal weight; well mixing with, by weight, 0.5-2.5 parts of gamma-aminopropyl triethoxysilane and 170 parts of high-silica chopped fibers; airing in the sun, drying and performing compression molding. A prepared lining is smooth and glossy in surface and free of bumps and cracks, the tested average tensile strength is 145MPa, the bending strength is 150MPa, the linear ablative rate is 0.13mm / s, and the lining is dense and flawless internally. The benzoxazine resin-based reinforcing fiber composite material can be applied to preparation of solid rocket engine jet pipe linings and other heatproof structures and has advantages of great product manufacturability, no pores, no cracks, ablation resistance and flame retardation.

Description

technical field [0001] The invention relates to a composite material, which is used for the heat-proof lining of solid rocket motor nozzles, partitions and other components, and is also suitable for high-temperature resistant and high-strength glass fiber reinforced plastic products. Background technique [0002] Solid rocket motor heat-resistant linings generally require tensile properties ≥ 39MPa, bending strength ≥ 59MPa, and oxyacetylene line ablation rate < 0.18mm / s. At present, the common solid rocket motor nozzle lining is molded with high silica fiber / aminophenolic aldehyde. This molding method has mature technology, excellent mechanical properties and ablation performance of the material, and can meet the mechanical properties and ablation resistance of the solid rocket motor heat-resistant inner lining. However, the nozzle liner made of fiber / phenol formaldehyde heat press has technical problems such as large curing shrinkage rate, small molecule release when t...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a benzoxazine resin-based reinforced fiber composite material, which can improve the internal and external quality of the nozzle liner, avoid incomplete release of small molecules of the product, and cause stress concentration on the surface, resulting in bulges and cracks. crack situation

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