Preparation method of high temperature-resistant alumina aerogel material

A technology of alumina aerogel and alumina sol is applied in the field of preparation of high temperature resistant alumina aerogel materials to achieve the effects of enhancing skeleton structure, improving temperature resistance and high transparency

Active Publication Date: 2015-04-08
IBIH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of almost zero shrinkage of alumina aerogels at temperatures above 1050 °C.

Method used

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  • Preparation method of high temperature-resistant alumina aerogel material
  • Preparation method of high temperature-resistant alumina aerogel material
  • Preparation method of high temperature-resistant alumina aerogel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Heat up the mixed solution of ethanol and deionized water to 60°C through a heating device, put a certain amount of aluminum sec-butoxide into it, stir at constant temperature for 10 minutes until it is clear, and then cool the sol to room temperature. Take a certain amount of nitric acid and add to the above sol. The obtained sol was mixed with a certain proportion of acetone and aniline solution. After continuing to stir for 10 minutes, the desired wet gel can be obtained. The molar ratio of aluminum sec-butoxide, deionized water, ethanol, nitric acid, acetone and aniline is 1:0.3:3.06:0.01:1.4:1.1. The wet gel was covered with a small amount of alcohol and aged for 1 day, and then replaced with alcohol 3 times for 12 hours each time.

[0027] Put the alumina wet gel into the supercritical drying equipment, take the partially hydrolyzed aluminum salt and tetraethyl orthosilicate mixed solution with a molar ratio of 3:1, put it into the autoclave, pre-fill...

Embodiment 2

[0029] Example 2: The mixed solution of ethanol and deionized water was heated to 70° C. by a heating device, and a certain amount of aluminum sec-butoxide was added thereto, stirred at constant temperature for 10 minutes until it was clarified, and then the sol was cooled to room temperature. A certain amount of hydrochloric acid was added to the above sol. The prepared sol was mixed with a certain proportion of methanol, deionized water, acetone and aniline solution. After continuing to stir for 15 minutes, the desired wet gel can be obtained. The molar ratio of aluminum sec-butoxide, deionized water, ethanol, hydrochloric acid, methanol, acetone and aniline is 1:0.6:10.5:0.039:0.25:0.7:0.5. The wet gel was covered with a small amount of alcohol, aged for 2 days, and then replaced with alcohol twice, each time for 18 hours.

[0030] Put the alumina wet gel into the supercritical drying equipment, take the partially hydrolyzed aluminum salt and tetraethyl orthosilicate mixe...

Embodiment 3

[0032] Example 3: The ethanol solution was heated to 68° C. by a heating device, and a certain amount of aluminum isopropoxide was added thereto, stirred at constant temperature for 8 minutes until it was clear, and then the sol was cooled to room temperature. Take a certain amount of nitric acid and add to the above sol. The obtained sol was mixed with a certain proportion of acetone and aniline solution. After continuing to stir for 15 minutes, the desired wet gel can be obtained. The molar ratio of aluminum isopropoxide, ethanol, nitric acid, acetone and aniline is 1:3.06:0.023:1.4:1.1. The wet gel was covered with a small amount of alcohol, aged for 1.5 days, and then replaced with alcohol three times for 24 hours each time.

[0033]Put the alumina wet gel into the supercritical drying equipment, take the partially hydrolyzed aluminum salt and tetraethyl orthosilicate mixed solution with a molar ratio of 8:1 and put it into an autoclave, and dry it supercritically at 300...

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Abstract

The invention relates to a preparation method of a high temperature-resistant alumina aerogel material. The technology comprises the processes of: preparing alumina sol by adopting an in situ generation method; innovatively leading in a modified liquid in a supercritical drying process by adopting the originated supercritical modifying technology in manners of ageing and solvent substitution, so as to obtain block aerogel which is high in mechanical strength and easy to process; carrying out pretreatment at high temperature of 1000 DEG C, and carrying out gas-phase modification of hexamethyl disilazane, so as to prepare the alumina aerogel of which the linear contraction is just 5% and the specific surface area can be up to 280 m<2> / g after high-temperature treatment at 1200 DEG C. By adopting the synthesis method, application of the alumina aerogel in high-temperature fields such as high-temperature catalysis, catalyst carriers and high-temperature heat insulation is greatly facilitated.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a preparation method of a high-temperature-resistant alumina airgel material. Background technique [0002] As a nanoporous material with high porosity (>90%), high specific surface area, and low density, silica airgel has been successfully applied in Cherenkov detectors, super heat insulating materials, catalyst supports, etc. With the development of catalysis and thermal insulation fields, the demand for high temperature resistant aerogels is becoming more and more urgent. For example when dealing with gaseous emissions or catalytic combustion, certain catalytic reactions are carried out at temperatures above 1000°C. Another example is that when a supersonic vehicle travels through the atmosphere, due to the severe friction with the air, the heat-resistant temperature of the outer heat insulation material needs to reach 1200°C or even higher. Silica a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
Inventor 沈军祖国庆王文琴邹丽萍连娅
Owner IBIH ADVANCED MATERIALS CO LTD
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