Method for quickly preparing silicondioxlde aerogel
A silicon dioxide and aerogel technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of long production cycle, difficult to prepare silicon dioxide aerogel, and the output can not meet the needs of the market, so as to shorten the production The effect of cycle and production improvement
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[0014] The rapid preparation method of the density-controllable silicon dioxide aerogel of the present invention comprises the following steps: first, put the pretreated silicon-containing sol or gel into a reaction kettle with a filling ratio of 20% to 90%, and Seal the reactor well; then heat the reactor to 60-200°C and keep it warm for 0-24 hours; release the pressure of the reactor after the reaction is completed and cool the reactor to room temperature; take out the solid reaction product to obtain silica airgel. The composite silica airgel doped with metal oxide can be prepared by introducing corresponding metal ions when preparing silica sol or gel. The density of the prepared product is 1~600kg / m 3 , the specific surface area is 300~2000m 2 / g, the thermal conductivity is 0.01~0.4W / mK, its structure is stable for a long time below 1000 ℃, and its various properties are stable for a long time in the air. The specific process is as follows:
[0015] a, the preparation ...
Embodiment 1
[0020] At room temperature, adjust the pH value of 100ml of commercially available silica sol to 2-3 with hydrofluoric acid, mix it with 200ml of acetone, 50ml of toluene and 50ml of ethanol, add excess anhydrous sodium sulfate to remove the water, and then add 1ml 0.1g / ml Eu(NO 3 ) 3 Solution, after stirring evenly, move it into the reaction kettle, and the filling rate is 50%. Raise the temperature of the reaction kettle to 180° C. and keep it warm for 12 hours. After the heat preservation is completed, the pressure of the reaction kettle is released and the reaction kettle is cooled to room temperature to obtain the silica airgel. The prepared silica airgel has a density of 70kg / m 3 , the porosity is 95%, and the specific surface area is 830m 2 / g, thermal conductivity is 0.032W / mK. The prepared silica airgel is composed of silica particles with a particle diameter of about 10nm, and the hole diameters in the solid network composed of nano-silica particles are distribut...
Embodiment 2
[0022] In this example, hydrofluoric acid is used to adjust the pH value of 200ml of commercially available silica sol to 2-3, mix it with 100ml of acetone, 25ml of toluene and 25ml of ethanol, add excess anhydrous sodium sulfate to remove the water, and then add 1ml 0.1g / ml Eu(NO 3 ) 3 Solution, after stirring evenly, move it into the reaction kettle, and the filling rate is 50%. Raise the temperature of the reaction kettle to 180° C. and keep it warm for 12 hours. After the heat preservation is completed, the pressure of the reaction kettle is released and the reaction kettle is cooled to room temperature to obtain the silica airgel. The prepared silica airgel has a density of 45kg / m 3 , the porosity is 98%, and the specific surface area is 890m 2 / g, thermal conductivity is 0.038W / mK.
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Abstract
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