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A kind of preparation method of carbon airgel thermal insulation composite material

A composite material, carbon aerogel technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of further improvement of thermal insulation performance, high production cost, strict drying process, etc., to achieve high strength, Good formability and good thermal insulation performance

Active Publication Date: 2020-09-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems existing in the preparation of carbon aerogels at present, especially the cumbersome process, long process cycle, and harsh drying process leading to high production costs, as well as the low mechanical strength and thermal insulation performance of existing carbon aerogel composites. To further improve the problems, etc., on the basis of comprehensive analysis of the advantages and disadvantages of various methods for preparing carbon airgel composite materials at present, the present invention proposes the self-sacrificing salt template method, combined with the solvothermal method to prepare ultra-high temperature resistant, lightweight, high-strength , High-efficiency heat-insulating carbon-aerogel composites

Method used

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  • A kind of preparation method of carbon airgel thermal insulation composite material
  • A kind of preparation method of carbon airgel thermal insulation composite material
  • A kind of preparation method of carbon airgel thermal insulation composite material

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Embodiment 1

[0042] (1) Preparation of salt-containing organosol: use resorcinol organic monomer and furfural organic monomer as carbon precursors, ammonium thiocyanate as self-sacrificing salt template, methanol as solvent, and basic catalyst hexamethylene The specific process is as follows: firstly, resorcinol, furfural organic monomer, ammonium thiocyanate, and hexamethylenetetramine were mixed and stirred for 1 hour to obtain a salt-containing phenolic prepolymer, and then methanol was added Continue to stir until a uniform solution is formed to obtain a salt-containing organosol, wherein the mol ratio of the five raw materials is furfural: resorcinol=2, ammonium thiocyanate: resorcinol=1, methyl alcohol: phenol=30, Hexamethylenetetramine: Resorcinol=0.01;

[0043] (2) Preparation of salt-containing organosol fiber preform composite by vacuum impregnation process: according to the volume size of the polyacrylonitrile-based fiber preform and the apparent density of the polyacrylonitrile...

Embodiment 2～972

[0048] When preparing the salt-containing organosol in the first step, the mixing and stirring time of phenolic organic monomer, aldehyde organic monomer, self-sacrificing salt template and catalyst should be 0.1-10h to ensure that the phenolic organic monomer and aldehyde organic monomer fully react to form the phenolic preform For polymers, the amount of different catalysts depends on the type of catalyst. Different catalysts have different amounts of catalysts due to differences in their catalytic activity. Using different catalysts should ensure that phenolic organic monomers and aldehyde organic monomers fully react after mixing and stirring for 0.1-10h Form a phenolic prepolymer, so the type of catalyst and mixing time have little effect on the properties of the prepared fiber-reinforced carbon airgel composite; , the types of fibers used are all carbon precursor fibers, which will be carbonized and cracked to form carbon fibers in the fifth step of carbonization and crac...

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Abstract

The invention discloses a preparation method of a carbon aerogel thermal insulation composite material. The method is simple and efficient and low in cost, and the prepared carbon aerogel thermal insulation composite material is good in formability, light in weight, high in strength and efficient and heat-insulating. According to the technical scheme, a phenol organic monomer and an aldehyde organic monomer are taken as a carbon precursor, and the salt which can be decomposed and volatilized at high temperature is used as a self-sacrificial salt template, organic solvent is used as a solvent,and an acidic or alkaline catalyst is adopted, so as to prepare a salt-containing organic sol; and a vacuum impregnation process is adopted to prepare the salt-containing organic sol fiber preform composite body; and a fiber-reinforced salt-containing organic gel composite body is prepared by adopting a solvothermal process; a normal-pressure drying process is adopted to prepare a fiber-reinforcedorganic aerogel composite; a carbonization cracking process is adopted to prepare the fiber reinforced carbon aerogel composite material. The method is simple in process, short in period and low in cost, the prepared material is good in formability, high in strength, low in heat conduction coefficient and good in heat insulation performance.

Description

technical field [0001] The invention relates to a preparation method of an ultra-high temperature resistant thermal insulation material, in particular to a preparation method of a lightweight and high-strength ultra-high temperature resistant carbon airgel thermal insulation composite material. Background technique [0002] Carbon airgel is a nanoporous material with a nanometer three-dimensional network structure and composed of nanometer-sized particles. This unique structure makes it have the characteristics of high specific surface area, large pore volume, low density, and low thermal conductivity. , it has the inherent properties of carbon materials such as stable physical and chemical properties, strong infrared radiation shielding ability, and ultra-high temperature resistance (up to 2000 °C or more) in an inert atmosphere, and has great application potential in the field of ultra-high temperature insulation. Because the service environment generally has complex and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/622C04B38/00
CPCC04B35/622C04B35/83C04B38/0045C04B2235/96C04B2235/9607C04B38/0054
Inventor 冯军宗冯坚张震姜勇刚李良军
Owner NAT UNIV OF DEFENSE TECH
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