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High-performance thermal insulation material and preparation method thereof

A technology of thermal insulation materials and fiber materials, which is applied in the field of fiber-reinforced airgel thermal insulation materials and its preparation, can solve the problems of easy oxidation and thermal insulation performance degradation, achieve low cost, avoid high cost, and simple preparation method Effect

Active Publication Date: 2011-01-19
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the carbon airgel material can withstand high / ultra-high temperature, the material is easily oxidized in the air at high temperature, resulting in a decrease in thermal insulation performance

Method used

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  • High-performance thermal insulation material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0075] (1) Preparation of sol: add catalyst to silica hydrosol and mix to obtain sol;

[0076] (2) Sol dipping and gelling: immerse the fiber material in the sol, and gel at room temperature or under heating conditions to obtain a fiber-reinforced silica wet gel;

[0077] (3) Aging: aging at room temperature or under heating for 8 hours to 168 hours;

[0078] (4) Solvent replacement: put the aged fiber-reinforced wet gel material into an alcohol solvent or a ketone solvent, so that the water content is lower than 1%;

[0079] (5) Hydrophobization: put the fiber-reinforced wet gel that has completed the solvent replacement into an absolute ethanol solution containing 0.5% to 10% by volume of a hydrophobizing agent, and let it stand at room temperature for 1 to 24 hours; then put the wet gel Take it out and put it in absolute ethanol for solvent replacement; preferably, the solvent replacement in absolute ethanol is carried out twice, each time for 24 hours to 120 hours, if

[0...

Embodiment 1

[0099] Add an alkaline silica sol (pH 9) with a silica content (sometimes referred to as a solid content) of 25% to the container, add hydrochloric acid (1M) and ammonia water (1M) dropwise under stirring conditions, and the gel chemical reaction begins. Wherein, the mass ratio is: silica sol:hydrochloric acid:ammonia water=100:4:6. Mix well and continue stirring for 5 minutes.

[0100] The impregnated bulk density with the obtained sol is 0.18g / cm 3 mullite asbestos felt. The impregnation method is as follows: first put the mullite wool felt into the mold cavity, and slowly add the above-mentioned sol into the mold cavity to make the mullite wool felt absorb the sol. After the mullite fiber mat is soaked in the sol, close the mold. After gelling at room temperature, the mullite fiber mat-reinforced silica wet gel is obtained.

[0101] The gel was further aged for 1 day at room temperature. Then disassemble the mold, take out the wet gel, and put it into absolute ethanol...

Embodiment 2～18

[0104] Except for the contents listed in Table 1, it was carried out in the same manner as in Example 1, and the properties of the obtained fiber-reinforced airgel thermal insulation material are shown in Table 1 below.

[0105]

[0106]

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Abstract

The invention provides a high-performance thermal insulation material and a preparation method thereof. The thermal insulation material comprises silicon dioxide aerogel and a fiber material, wherein, the silicon dioxide aerogel takes silicon dioxide hydrosol as a raw material, and is prepared by adding a catalyst. The method comprises the following steps: sol preparing, sol dipping, gelating, gel ageing, hydrophobization treating and drying and the like. The method can conveniently and selectively prepare the materials of planes, abnormal-shape surfaces and multiple sizes, has simple and convenient operation and small environmental pollution. The material has excellent mechanical performance, good high-temperature stability and heat insulation performance, and has wide application prospect in the fields of civilian industries, space flight and aviation industries, military industries and the like.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a fiber-reinforced airgel heat insulating material and a preparation method thereof. Background technique [0002] With the rapid development of human economic life, human demand for energy is increasing. However, at present, the energy used by human beings is mainly non-renewable energy, and energy shortage has become an important obstacle restricting human development. Therefore, reducing energy consumption and saving energy has become the goal that human beings need to work together. [0003] Thermal insulation material technology is a very efficient and low-cost energy-saving technology, which has important uses in many fields. For example, in the field of construction, the use of thermal insulation materials can reduce energy consumption caused by the use of air-conditioning refrigeration or heating; in the field of smelting industry, the use of fiber-reinforced airgel ...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B14/04
CPCC04B30/02C04B2111/28C04B2111/00008C04B2111/00982C04B14/064
Inventor 张继承邹军锋张鹏张昊赵宇詹万初
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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