Silicon dioxide aerogel composite material and preparation method and application thereof
A composite material, silicon dioxide technology, applied in the field of silica airgel composite materials, can solve the problems of loss of reliability, easy moisture absorption, loss of moisture-proof performance, etc., and achieve unaffected performance, good moisture-proof performance, good The effect of temperature resistance and hydrophobic properties
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[0030] Specifically, the present invention provides a method for preparing a 600°C-resistant reusable moisture-proof silica airgel composite material, the method comprising the following steps:
[0031] Construction of fluorine-containing hydrophobic layer:
[0032] Use fluorine-containing silane coupling reagents and optional orthosilicates to carry out hydrolysis-polycondensation reactions for 6h-24h in alcohol solvents under acidic catalytic conditions, and build a temperature-resistant hydrophobic layer structure on the surface of the sol particles to form a temperature-resistant Hydrophobic layer structure.
[0033]In the presence of orthosilicates, the fluorine-containing silane coupling agent and orthosilicates can be blended with alcohols (such as ethanol, methanol) solvents under acidic catalytic conditions, and the mixing ratio can be as described above: 1:0~100 (such as 1:0, 1:0.5, 1:1, 1:5, 1:10, 1:20, 1:50 or 1:100), and stir at room temperature for 6h-24h ( For...
Embodiment 1
[0052] Dissolve tridecafluorooctyltrimethoxysilane, methyl orthosilicate, formic acid, and deionized water in a molar ratio of 10:50:4.8:240 in a 600 molar equivalent ethanol solution, and stir at room temperature for 12 hours. Set the density to 0.1g / cm 3 Put the prefabricated body of quartz fiber felt into the mold, and use the vacuum pressure molding method to compound the above-mentioned silica sol with the prefabricated body under the condition of alkali catalysis (controlling the pH value between 8 and 9), and then aging at room temperature 36h, 90°C high-temperature aging for 36h, acetone solvent replacement for 3 times after aging, supercritical carbon dioxide drying, and then placed in a muffle furnace at 500°C for 0.5h. Put the treated material at room temperature and place it in a closed container, add a catalytic amount of formic acid solution and 5% by mass of pentafluorophenyltrimethoxysilane accounting for the total amount of the material, and perform hydrophobi...
Embodiment 2
[0054] Dissolve heptadecafluorodecyltrimethoxysilane, methyl orthosilicate, oxalic acid, and deionized water in a molar ratio of 10:50:4.8:240 in a 500 molar equivalent ethanol solution, and stir at room temperature for 10 h. Set the density to 0.1g / cm 3 Put the prefabricated body of quartz fiber felt into the mold, and use the vacuum pressure molding method to compound the above-mentioned silica sol with the prefabricated body under the condition of alkali catalysis (controlling the pH value between 8 and 9), and then aging at room temperature 36h, 90°C high temperature aging for 36h, acetone solvent replacement 3 times after aging, supercritical carbon dioxide drying, and then placed in a muffle furnace at 500°C for 1h. Place the treated material in a closed container after placing it at room temperature, add a catalytic amount of formic acid solution and pentafluorophenyltrimethoxysilane accounting for 5% by mass of the total material, and carry out hydrophobic treatment af...
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