Spaceflight ablation heat-proof chopped fiber/phenolic aldehyde high-density premix, manual premixing preparation method and composite material thereof

A technology of chopped fiber and premix, which is applied in the field of composite materials, can solve the problem of low shear strength between layers, and achieve the effect of weakening the concept of layers, flame-retardant mechanical strength, and good molding fluidity

Inactive Publication Date: 2021-11-12
北京元蛋复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, composite materials prepared with intermediate materials such as traditional continuous prepregs have the problem of low interlaminar shear strength

Method used

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  • Spaceflight ablation heat-proof chopped fiber/phenolic aldehyde high-density premix, manual premixing preparation method and composite material thereof
  • Spaceflight ablation heat-proof chopped fiber/phenolic aldehyde high-density premix, manual premixing preparation method and composite material thereof
  • Spaceflight ablation heat-proof chopped fiber/phenolic aldehyde high-density premix, manual premixing preparation method and composite material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The raw materials for preparing the high-silica chopped fiber / aminophenolic premix and its composite material described in this embodiment include high-silica chopped fiber, aminophenolic resin, and absolute ethanol.

[0045] Among them, the aminophenol-formaldehyde resin adopts the product of brand 616, and its resin content is 60%. The high silica chopped fiber length is 50mm.

[0046] The preparation method of the high silica chopped fiber / aminophenol aldehyde premix and its composite material described in the present embodiment is specifically as follows:

[0047] 1. Filter the resin with a 100-200-mesh copper or stainless steel filter;

[0048] 2. The cut length of high silica chopped fiber is 24mm, and it is placed in an oven at (120±5)°C for 4 hours;

[0049] 3. Dilute 3.03kg of aminophenol-formaldehyde resin with 500ml of alcohol, stir well and form a liquid with appropriate concentration;

[0050] 4. Weigh 3kg of high-silica fiber, tear off the knots in it b...

Embodiment 2

[0059] The high-silica chopped fiber / magnesium phenolic premix and its composite material described in this embodiment are prepared from high-silica chopped fiber, magnesium phenolic resin, and absolute ethanol.

[0060] Wherein, the resin content of the magnesium phenolic resin is 55%. The high silica chopped fiber length is 50mm.

[0061] The preparation method of the high silica chopped fiber / magnesium phenolic premix and composite material described in the present embodiment is specifically as follows:

[0062] 1. Filter the resin with a 100-200-mesh copper or stainless steel filter;

[0063] 2. The cut length of high silica chopped fiber is 50mm, and it is placed in an oven at 120±5°C for 4 hours;

[0064] 3. Dilute 3.7kg magnesium phenolic resin with 1400ml alcohol, stir well and form a liquid with appropriate concentration;

[0065] 4. Weigh 3kg of high-silica fiber, tear off the knots in it by manual operation, and then mix the fiber and the prepared resin solution ...

Embodiment 3

[0073] The raw materials for preparing the viscose-based chopped carbon fiber / aminophenolic premix and its composite material described in this embodiment include viscose-based chopped carbon fiber, aminophenolic resin, and absolute ethanol.

[0074] Among them, the aminophenol-formaldehyde resin adopts the product of brand 616, and its resin content is 60%. The viscose-based chopped carbon fibers have a length of 20m.

[0075] The preparation method of the viscose-based chopped carbon fiber / aminophenolic premix and composite material described in the present embodiment is as follows:

[0076] 1. Filter the resin with a 100-200-mesh copper or stainless steel filter;

[0077] 2. The viscose-based chopped carbon fiber cut length is 40mm, and placed in an oven at 120±5°C for 4 hours;

[0078] 3. Dilute 1.50kg of aminophenol-formaldehyde resin with 900ml of alcohol, stir well and form a liquid with appropriate concentration;

[0079] 4. Weigh 1.00kg of viscose-based chopped car...

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Abstract

The invention provides a spaceflight ablation heat-proof chopped fiber / phenolic aldehyde high-density premix, a manual premixing preparation method and a composite material thereof The spaceflight ablation heat-proof chopped fiber / phenolic aldehyde high-density premix is prepared from high-temperature-resistant chopped fibers and high-residual-carbon phenolic aldehyde under the action of an auxiliary agent by adopting a manual premixing process, and is prepared by the steps of cutting yarns, drying the yarns, preparing glue, manually premixing, tearing, laying, airing, drying, testing, packaging, storing, starting and the like to prepare an intermediate material which has a certain pre-curing degree, is in a scattered state and has no certain direction of fibers. Then the spaceflight ablation heat-proof composite material is prepared from the chopped fiber / phenolic aldehyde high-density premix in a closed mold at a certain temperature and pressure through the mold pressing process. The resin content of the premix is (33-55)%, and the density of the composite material formed by the premix through the mold pressing process is (1.45-1.85) g / cm < 3 >. The premix prepared by the manual premixing method has the manufacturability advantages of being good in mold pressing fluidity, suitable for manufacturing composite material products with complex structures, high in resin content precision, capable of forming composite materials in net size and the like; and the composite material formed by the premix through a mold pressing process has excellent characteristics of ablation resistance, high temperature resistance, heat insulation, flame retardance and the like, has certain mechanical strength, and can be applied to the fields of aerospace ablation heat protection, civil use and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials in new materials, and in particular relates to an aerospace burning heat-resistant chopped fiber / phenolic high-density premix, a manual premix preparation method and a composite material thereof. Background technique [0002] Aerodynamic thermal protection and engine thermal protection are required for aerospace vehicles in harsh environments such as high temperature, such as the aerodynamic heat generated when the nose cone of an intercontinental missile re-enters the atmosphere or the ultra-high temperature and high-speed particle erosion generated by the combustion of solid rocket motor propellants. Aerospace ablation and heat-resistant composite materials refer to the mass loss caused by the ablation of the material itself, absorbing and taking away a large amount of heat, preventing the external heat from transferring to the inside of the structure, thereby protecting the internal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/14C08K7/10C08K7/06C08K7/14B29C43/02
CPCC08K7/10C08K7/06C08K7/14B29C43/02C08L2201/08C08L2201/02C08L61/14
Inventor 许亚丰
Owner 北京元蛋复合材料有限公司
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