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Multilayer-arranged heat insulating material and preparation method thereof

A heat insulation material and infrared blocking technology, applied in the field of functional composite materials, to achieve the effect of improving heat insulation efficiency

Inactive Publication Date: 2016-02-17
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors have also found that a thin felt made from a fiber can only have the best thermal insulation performance in a certain temperature zone

Method used

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  • Multilayer-arranged heat insulating material and preparation method thereof
  • Multilayer-arranged heat insulating material and preparation method thereof
  • Multilayer-arranged heat insulating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1: Preparation of multi-layer thin felt composite heat insulation material at 1600°C

[0077] (1) Prepare 3 alumina fiber mats, aluminum silicate fiber mats, high silica fiber mats and basalt wool fiber mats each with a thickness of 3 mm, with a format size of 200 mm × 200 mm;

[0078] (2) Get three alumina fiber thin felts, two aluminum silicate fiber thin felts, high silica fiber thin felts and basalt cotton fiber thin felts, and lay layers in the airgel forming mold according to the above-mentioned sampling sequence;

[0079] (3) prepare alumina sol according to the ratio of aluminum sec-butoxide: ethanol: nitric acid: water=6.6: 20: 0.039: 1 (molar ratio), stir evenly and set aside;

[0080] (4) Inject the aluminum oxide sol prepared in step (3) into the mold with thin felt in step (2), close the mold to 25mm, gel, and age;

[0081] (5) Take out the wet gel in step (4), replace it with ethanol for solvent replacement, and finally supercritically dry to obta...

Embodiment 2

[0087] Example 2: Preparation of multi-layer thin felt composite heat insulation material at 1200°C

[0088] (1) Prepare 4 mullite fiber mats, high silica fiber mats and basalt cotton fiber mats each with a thickness of 3mm, with a format size of 200mm × 200mm;

[0089] (2) Get three pieces of mullite fiber thin felt, high silica fiber thin felt and basalt cotton fiber thin felt, and lay layers in the airgel forming mold according to the above-mentioned sampling sequence;

[0090] (3) Prepare silica sol according to the ratio of ethyl orthosilicate: ethanol: water: ammonia water: ammonium fluoride=1000: 1508: 340: 0.3: 0.1 (weight ratio), stir evenly and set aside;

[0091] (4) Inject the silicon oxide sol prepared in step (3) into the mold with thin felt in step (2), close the mold to 25mm, gel, and age;

[0092] (5) Take out the wet gel in step (4), replace it with ethanol for solvent replacement, and finally supercritically dry to obtain a multi-layer thin felt composite h...

Embodiment 3

[0098] Example 3: Preparation of multi-layer thin felt composite heat insulation material at 1000°C

[0099] (1) The preparation thickness is 5 pieces of high silica fiber thin felt and basalt cotton fiber thin felt each with a thickness of 3mm, and the format size is 200mm×200mm;

[0100] (2) Get five high-silica fiber thin felts and four basalt wool fiber thin felts, and lay layers in the airgel forming mold according to the above-mentioned sampling sequence;

[0101] (3) Prepare silica sol according to the ratio of ethyl orthosilicate: ethanol: water: ammonia water: ammonium fluoride=1000: 1508: 340: 0.3: 0.1 (weight ratio), stir evenly and set aside;

[0102] (4) Inject the silicon oxide sol prepared in step (3) into the mold with thin felt in step (2), close the mold to 25mm, gel, and age;

[0103] (5) Take out the wet gel in step (4), replace it with ethanol, and finally supercritically dry it to obtain a multi-layer thin felt composite heat insulation material for 1000...

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Abstract

The invention discloses a multilayer-arranged heat insulating material and a preparation method thereof. The method comprises the following steps: preparing fiber slurry; preparing wet blank and de-molding; drying to obtain thin felts; laying up and putting the thin felts into aerogel forming equipment; forming aerogel by soaking laid-up thin felts by virtue of a supercritical drying method, thereby obtaining the multilayer-arranged heat insulating material, wherein the multiple layers of thin felts are selected from a group consisting of a high-temperature region thin felt, a medium-temperature region thin felt, a low-temperature region thin felt, a lower-temperature region thin felt and an extremely-low temperature region thin felt, the thin felts are laid up in a decreasing mode according to the temperature regions, and the thin felts made of different fibers are combined. According to the method, fiber types, infrared blocker types and infrared block content can be regulated according to difference of applied temperature regions, so that a material combination with the best heat insulating property is obtained, and the material has better forming property, is convenient for the preparation of products with different mould surfaces and dimensions, and can be used in a temperature environment with a temperature of 400-1600 DEG C or higher according to the usage environment requirements.

Description

[0001] This application is a divisional case of an invention patent application with an application date of "August 21, 2013", an application number of "201310364024.0", and an invention title of "a high-performance multi-layer thin felt composite heat insulation material and its preparation method" Apply. technical field [0002] The invention relates to the technical field of functional composite materials, in particular, the invention relates to a high-performance composite heat insulation material and a preparation method thereof. Background technique [0003] Airgel is a lightweight nanoporous material formed by the condensation of colloidal particles. The effect is greatly reduced, and at the same time, the accumulation of nanoparticles into an infinitely long path also effectively weakens the heat conduction effect of the solid. Based on the excellent inhibition effect of the airgel material on the solid and gaseous conduction, it is currently known as the lowest ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B28/24C04B14/38
Inventor 张凡宋寒刘斌苏力军詹万初
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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