Rapid preparation method for aerogel material
An aerogel and gel method technology, which is applied in the field of rapid preparation of aerogel materials, can solve the problems of low specific surface area, large shrinkage, and multi-media solvent of aerogel, so as to shorten the preparation period and save consumption. Effect
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Embodiment 1
[0038] Mix aluminum sec-butoxide, ethanol, and deionized water at a molar ratio of 1:16:0.6, stir at 60°C for 30 minutes to form a clear and transparent solution, cool to room temperature, add a mixed solution of methanol, deionized water, and acetic acid, and mix The amount of solution added is 4.92:016:0.45:1 according to the molar ratio of the three to aluminum sec-butoxide. After stirring for 10 minutes, pour the sol into the hydrothermal kettle, close the lid of the hydrothermal kettle tightly, and let it stand to form a gel. Finally, put it into a 2L autoclave, add 200ml of ethanol, then seal the autoclave, blow nitrogen into the autoclave to purge the air in the autoclave, then pressurize to 3MPa, and heat up to 260°C at 3°C / min. When the internal pressure reaches 12MPa, open the exhaust valve and start to release the pressure at a rate of 0.07MPa / min. After the pressure drops to 0, start to lower the temperature. After cooling, open the autoclave and hydrothermal kettle...
Embodiment 2
[0040]Mix aluminum isopropoxide, isopropanol, and deionized water at a molar ratio of 1:12:1.5, stir at 60°C for 40 minutes to form a clear and transparent solution, cool to room temperature, add a mixed solution of methanol, deionized water, and acetic acid , the amount of the mixed solution added is 4.92:016:0.45:1 according to the molar ratio of the three to aluminum isopropoxide. After stirring for 10 minutes, pour the sol into the hydrothermal kettle, close the lid and let it stand for gel formation, then put into a 2L autoclave, add 100ml of isopropanol, then seal the autoclave, feed nitrogen to purge the air in the autoclave, then pressurize to 5MPa, and heat up to 270°C at 5°C / min. When the pressure reaches 13.5MPa, open the exhaust valve and start to release the pressure at a rate of 0.2MPa / min. After the pressure drops to 0, start to lower the temperature. After cooling, open the autoclave and hydrothermal kettle to obtain alumina with no shrinkage and good formabilit...
Embodiment 3
[0042] Mix aluminum nitrate, isopropanol, and deionized water at a molar ratio of 1:8:0.4, and stir at 60°C for 40 minutes to form a clear and transparent solution. After cooling to room temperature, add a mixed solution of methanol, deionized water, and acetic acid. The amount of the mixed solution to be added is 4.92:016:0.45:1 according to the molar ratio of the three to aluminum nitrate. After stirring for 10 minutes, pour the sol into the hydrothermal kettle, close the lid tightly and wait for the gel to form, then put it into a 2L autoclave , add 400ml of isopropanol, then seal the autoclave, blow nitrogen to purge the air in the autoclave, then pressurize to 2MPa, raise the temperature to 270°C at 5°C / min, at this time, the pressure in the autoclave reaches 9MPa, open The exhaust valve starts to release the pressure at a rate of 0.14MPa / min. After the pressure drops to 0, the temperature starts to drop. After cooling, the autoclave and the hydrothermal kettle are opened ...
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