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A kind of low-density ablative thermal insulation composite material and preparation method thereof

A composite material and low-density technology, applied in the field of carbon materials, can solve the problems of restricting large-scale production, harsh process conditions, and long preparation cycle

Active Publication Date: 2021-10-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent uses supercritical drying in the process of preparing phenolic aerogels. The process conditions are harsh and the preparation cycle is long, which limits its large-scale production.

Method used

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  • A kind of low-density ablative thermal insulation composite material and preparation method thereof
  • A kind of low-density ablative thermal insulation composite material and preparation method thereof
  • A kind of low-density ablative thermal insulation composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A certain amount of prepared thermosetting phenolic resin and curing agent-paraformaldehyde were respectively weighed, added into a reaction kettle containing a certain amount of ethanol, and mechanically stirred until completely dissolved to obtain a phenolic resin solution. Wherein the mass ratio of phenolic resin to ethanol is 1:20, and the mass ratio of phenolic resin to paraformaldehyde is 20:1.

[0043] Set the density to 150Kg / m 3 The polypropylene-based carbon fiber felt was cut into a size of 150mm×150mm, and placed in a 100°C oven for heat treatment for more than 6 hours; the heat-treated carbon fiber felt was laid flat in a stainless steel mold customized by the laboratory, and the above-mentioned phenolic resin solution was used in the Slowly impregnate the carbon fiber felt under normal temperature and pressure until the phenolic resin impregnating solution can completely soak the carbon fiber felt, then seal the mold, place it in an oven at 80°C, undergo a...

Embodiment 2

[0045] A certain amount of prepared thermosetting phenolic resin and curing agent-hexamethylenetetramine were respectively weighed, added into a reaction kettle containing a certain amount of ethanol, and mechanically stirred until completely dissolved to obtain a phenolic resin solution. Wherein the mass ratio of phenolic resin to ethanol is 1:10, and the mass ratio of phenolic resin to hexamethylenetetramine is 10:1.

[0046] Set the density to 150Kg / m 3 The polypropylene-based carbon fiber felt was cut into a size of 150mm×150mm, and placed in a 100°C oven for heat treatment for more than 6 hours; the heat-treated carbon fiber felt was laid flat in a stainless steel mold customized by the laboratory, and the above-mentioned phenolic resin solution was used in the Slowly impregnate the carbon fiber felt under normal temperature and pressure until the phenolic resin impregnating solution can completely soak the carbon fiber felt, then seal the mold, place it in an oven at 80°...

Embodiment 3

[0048] A certain amount of prepared thermosetting phenolic resin and curing agent-paraformaldehyde were respectively weighed, added into a reaction kettle containing a certain amount of ethanol, and mechanically stirred until completely dissolved to obtain a phenolic resin solution. Wherein the mass ratio of phenolic resin to ethanol is 1:2, and the mass ratio of phenolic resin to paraformaldehyde is 5:1.

[0049] Set the density to 150Kg / m 3 The polypropylene-based carbon fiber felt was cut into a size of 150mm×150mm, and placed in a 100°C oven for heat treatment for more than 6 hours; the heat-treated carbon fiber felt was laid flat in a stainless steel mold customized by the laboratory, and the above-mentioned phenolic resin solution was used in the Slowly impregnate the carbon fiber felt under normal temperature and pressure until the phenolic resin impregnating solution can completely soak the carbon fiber felt, then seal the mold, place it in an oven at 80°C, undergo a s...

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Abstract

The invention relates to a low-density ablation heat-insulating composite material and a preparation method thereof. The composite material uses phenolic airgel with a nano-particle structure as a matrix, and uses flexible fiber mats or fiber braids as reinforcements. Resin, preparation of phenolic resin solution, heat treatment of flexible fiber felt or fiber braid, impregnation of flexible fiber mat or fiber braid with phenolic resin solution, sol-gel reaction, aging, drying and curing of composite materials. Compared with the prior art, the present invention has excellent heat resistance performance, good mechanical properties, strong designability, simple preparation process, low cost, easy processing and molding and later size cutting, and has different thermal properties under medium heat flow and medium and low heat flow environments. Protection requirements can be applied to manned spaceflight and deep space exploration vehicles, various tactics for short-time work, outer heat shields of strategic weapons, inner ablation heat insulation and heat shields of engines, and one-time-use super aircraft.

Description

technical field [0001] The invention belongs to the field of carbon materials, and in particular relates to a low-density ablation heat-insulation composite material and a preparation method thereof. Background technique [0002] The thermal protection system is referred to as TPS (Thermal Protection System), which is a structure used to protect the spacecraft from burning and overheating in the aerodynamic heating environment. There are two types of thermal protection systems to date: reusable thermal protection systems and ablative thermal protection systems. The reusable thermal protection system does not undergo phase change and mass loss during take-off and reentry, and can also play a load-bearing role. The biggest disadvantage is that the maximum operating temperature is limited. Ablation heat protection plays a role of heat protection through phase change and material consumption, and uses the mass injection effect of the gasification product of the heat-resistant m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08K7/06C08G8/06C08G8/08C08G8/10C08G8/22
CPCC08G8/06C08G8/08C08G8/10C08G8/22C08K7/06C08L61/06
Inventor 龙东辉朱召贤凌立成
Owner EAST CHINA UNIV OF SCI & TECH
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