Method for preparing alumina aerogel

A technology of alumina airgel and gel, which is applied in the field of materials science, can solve the problems of high cost, large shrinkage rate, and poor blockability of alumina airgel, and achieve low-cost comprehensive performance, low shrinkage rate, and production cost. low effect

Inactive Publication Date: 2018-07-27
SHANGHAI INST OF TECH
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  • Description
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  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing alumina airgel, the method for preparing...

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  • Method for preparing alumina aerogel
  • Method for preparing alumina aerogel
  • Method for preparing alumina aerogel

Examples

Experimental program
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Embodiment 1

[0050] Preparation of polymer complexing agent solution: Dissolve 5g of polyvinyl alcohol in 50ml of deionized water, add sulfuric acid to adjust the pH to 1-2, heat to 85°C to dissolve completely, then add 12.5ml of methyl acetoacetate, and keep ventilation Stir in a water bath at 85°C for 5 hours, then cool the solution to room temperature, add a small amount of triethylamine to adjust the pH to 7, and this solution is a modified polyvinyl alcohol solution, which is designated as solution A.

[0051] Preparation of alumina airgel: Mix solution A with deionized water, and keep the total volume at 5ml, wherein the volume ratio of solution A to deionized water is 1:4, add 1ml of absolute ethanol to the mixed solution, 0.5ml of N,N-dimethylacetamide, after stirring evenly, add 5g of aluminum chloride hexahydrate, and continue stirring for 1 hour. Add propylene oxide to the above aluminum chloride solution step by step, 2g each time, twice in total. After stirring for 2 minutes, ...

Embodiment 2

[0054] Preparation of polymer complexing agent: Dissolve 5g of polyvinyl alcohol in 50ml of deionized water, add sulfuric acid to adjust the pH to 1-2, heat to 85°C to dissolve completely, then add 12.5ml of methyl acetoacetate, and keep aeration Stir in a water bath at 85°C for 5 hours, then cool the solution to room temperature, add a small amount of triethylamine to adjust the pH to 7, and this solution is a modified polyvinyl alcohol solution, which is designated as solution A.

[0055] Preparation of alumina airgel: Mix solution A with deionized water, and keep the total volume at 5ml, wherein the volume ratio of solution A to deionized water is 2:3, add 1ml of absolute ethanol to the mixed solution, 0.5ml of N,N-dimethylacetamide, after stirring evenly, add 5g of aluminum chloride hexahydrate, and continue stirring for 1 hour. Add propylene oxide to the above aluminum chloride solution step by step, 2g each time, twice in total. After stirring for 2 minutes, take out the...

Embodiment 3

[0058] Preparation of polymer complexing agent: Dissolve 5g of polyvinyl alcohol in 50ml of deionized water, add sulfuric acid to adjust the pH to 1-2, heat to 85°C to dissolve completely, then add 12.5ml of methyl acetoacetate, and keep aeration Stir in a water bath at 85°C for 5 hours, then cool the solution to room temperature, add a small amount of triethylamine to adjust the pH to 7, and this solution is a modified polyvinyl alcohol solution, which is designated as solution A.

[0059] Preparation of alumina airgel: Mix solution A with deionized water, and keep the total volume at 5ml, wherein the volume ratio of solution A to deionized water is 3:2, add 1ml of absolute ethanol to the mixed solution, 0.5ml of N,N-dimethylacetamide, after stirring evenly, add 5g of aluminum chloride hexahydrate, and continue stirring for 1 hour. Add propylene oxide dropwise to the above aluminum chloride solution, 2 g each time, twice in total. After stirring for 2 minutes, take out the ro...

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Abstract

The invention relates to a method for preparing alumina aerogel. Firstly, methyl acetoacetate and polyvinyl alcohol are used as raw materials; concentrated sulfuric acid is used as a catalyst; throughester exchange reaction, acetoacetic acid groups are grafted on polyvinyl alcohol to prepare a macromolecule complexing agent; secondly, massive alumina aerogel with high density, high intensity, lowshrinkage rate, high porosity, high specific surface area and concentrated hole diameter distribution is obtained through preparation by using aluminium chloride hexahydrate as an inorganic phase precursor, using the macromolecule complexing agent as an additive, using deionized water as a solvent and using propylene oxide as a network gel inducting agent through the sol-gel process and the supercritical drying and roasting processes. The macromolecule complexing agent is added into the sol-gel process as a gel guiding agent and a dispersant, so that metal aluminum ion sol is uniformly dispersed in the solvent and is restrained by a macromolecule chain segment into a core; the primary particle aggregation mode is changed, so that the microstructure of the aerogel is changed. Meanwhile, the density and the intensity of the gel are enhanced.

Description

technical field [0001] The invention belongs to the field of material science, and relates to an alumina airgel material, in particular to a method for preparing alumina airgel. technical background [0002] With the development of human society, the shortage of energy and resources comes with it. Excessive consumption and waste of energy and resources have exacerbated the pollution of the earth and the greenhouse effect, threatening our living environment. Therefore, while we are developing the economy, we are also pursuing low energy consumption and high efficiency to alleviate the shortage of energy. In terms of improving the efficiency of energy use, for example, in the high-temperature catalytic industry and the thermal insulation material industry, we need porous materials with large specific surface area, high porosity, stable structure and high temperature resistance to improve catalytic efficiency and thermal insulation performance. Airgel materials, especially al...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01F7/44C08F8/14C08F16/06
CPCC01F7/306C01F7/441C01P2002/82C01P2004/04C01P2006/10C01P2006/12C01P2006/14C01P2006/16C08F8/14C08F16/06
Inventor 张睿张晓康金双玲陆王钊胡震唐珊李伟锋魏亚斌金鸣林刘艳
Owner SHANGHAI INST OF TECH
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