Preparation method of high-strength blocky aluminium oxide aerogel

An alumina airgel, high-strength technology, applied in the preparation of alumina/hydroxide, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problem of poor block formability, fragility, and pure alumina To solve the problems of low strength of bulk materials, achieve high compressive strength, good uniformity, good wettability, dispersibility and stability

Active Publication Date: 2019-10-22
浙江鹏辰造纸研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned problems existing in the prior art, the object of the present invention is to provide a kind of preparation method of high-strength block alumina airgel, it is reinforcing material with hollow glass microsphere, and alumina airgel is in sol- Compounding in the gel process, solving the problems of low strength, poor block formability, and easy breakage of pure alumina block materials prepared by the existing technology, and preparing block-shaped high-strength alumina airgel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0030] Example 2 The preparation method of the high-strength bulk alumina airgel is as follows:

[0031] 1) Mix 8g of aluminum sec-butoxide (98% content) and 28g of ethanol-water solution (prepared by adding 0.5ml of water to 50ml of absolute ethanol) in a beaker according to the weight percentage, and heat it on a magnetic stirrer to 55 °C, stir for 30 min until the solution is clear;

[0032] 2) First prepare the mixed aqueous solution of absolute ethanol and glacial acetic acid with 50ml of absolute ethanol, 2ml of water, and 0.5ml of glacial acetic acid (acetic acid content≧99.5%), then add 13ml dropwise to the solution in step 1) to prepare The mixed aqueous solution of absolute ethanol and glacial acetic acid was stirred at 55°C for 1.5hr, then the heating was stopped and cooled to room temperature to make aluminum sol;

[0033] 3) Add 1.0 g of hollow glass microspheres (density 0.15 g / ml, particle size 30-50 microns, wall thickness 1-2 microns) to the aluminum sol obta...

Embodiment 3

[0038] Example 3 The preparation method of the high-strength bulk alumina airgel is as follows:

[0039] 1) In a beaker, mix 8g of aluminum sec-butoxide (98% content) and 40g of ethanol-water solution (prepared by adding 0.5ml of water to 50ml of absolute ethanol) in a beaker, and heat it on a magnetic stirrer to 60 °C, stir for 20 min until the solution is clear;

[0040] 2) First prepare the mixed aqueous solution of absolute ethanol and glacial acetic acid with 50ml of absolute ethanol, 2ml of water, and 0.5ml of glacial acetic acid (acetic acid content≧99.5%), then add 15ml dropwise to the solution in step 1) to prepare The mixed aqueous solution of absolute ethanol and glacial acetic acid was stirred at 60°C for 1.0 hr, stopped heating and cooled to room temperature to make aluminum sol;

[0041] 3) Add 1.5g of hollow glass microspheres (density 0.15g / ml, particle size 30-50 microns, wall thickness 1-2 microns) to the aluminum sol obtained in step 2), and stir thoroughly...

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PUM

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Abstract

The invention relates to a preparation method of high-strength blocky aluminium oxide aerogel, and belongs to the field of heat insulation materials. The preparation method comprises the steps of preparing aluminium oxide sol by taking aluminium sec-butoxide as an aluminium source, uniformly mixing hollow glass microspheres with the aluminium oxide sol, gelling and aging, supercritically drying and the like to prepare the high-strength blocky aluminium oxide aerogel. By adopting the limited technology, the obtained high-strength blocky aluminium oxide aerogel has excellent characteristics of good formability and mechanical property, high porosity, small aperture, high temperature resistance, low thermal conductivity, good thermal stability and the like.

Description

technical field [0001] The invention relates to a preparation method of alumina airgel, in particular to a preparation method of high-strength alumina block airgel added with hollow glass microspheres. Background technique [0002] Airgel is a solid material with a unique nanoporous structure, a porosity of more than 90%, a pore size of <100nm, a large specific surface area, an extremely low thermal conductivity, and a low density. Acoustics and many other aspects have shown unique performance, and they are new materials with great application value in the fields of heat insulation, new energy, aerospace and other fields. [0003] There are many types of aerogels, such as silica aerogels, alumina aerogels, carbon aerogels, etc. Among all types of aerogels, the most researched, the most mature and the most widely used in industrial applications is undoubtedly Silica system airgel material. Compared with silica airgel, alumina airgel not only has the properties of general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/30C01F7/44
CPCC01F7/027C01F7/30C01F7/44
Inventor 王虹李红祝周裴灿胡晓东林献
Owner 浙江鹏辰造纸研究所有限公司
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