Preparation method of high-temperature-resistant SiOC aerogel
An aerogel and high temperature resistant technology is applied in the field of preparation of high temperature resistant SiOC aerogel materials, which can solve the problems of high cost and complicated preparation, and achieve the effect of simple preparation method and avoiding the disappearance of pore structure.
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Embodiment 1
[0024] Dissolve dimethyldimethoxysilane, methyltrimethoxysilane and cetyltrimethylammonium bromide in deionized water to obtain a transparent solution, in which methyltrimethoxysilane, dimethyldimethoxy The mol ratio of base silane, cetyltrimethylammonium bromide, and deionized water is 1:1:0.06:40; Add 0.5mol / L ammonia water to adjust the pH value of the solution to form a gel at 7.5 in the above solution, and the The gel was aged at 40°C for 24 hours; the aged gel was soaked in deionized water, soaked for 8 hours each time, and soaked 5 times; the soaked gel was directly put into an oven for normal pressure drying, and the drying temperature was 110°C , The drying time was 48h to obtain polyalkylsiloxane airgel. The polyalkylsiloxane airgel was placed in a tube furnace, and Ar was introduced at a rate of 2 mL / min, then heated to 1200 °C for 4 h at a heating rate of 2 °C / min, and SiOC airgel was obtained after natural cooling.
[0025] The prepared polyalkylsiloxane airgel h...
Embodiment 2
[0028] Dissolve dimethyldimethoxysilane, methyltrimethoxysilane and cetyltrimethylammonium bromide in deionized water to obtain a transparent solution, in which methyltrimethoxysilane, dimethyldimethoxy The molar ratio of base silane, cetyltrimethylammonium bromide, and deionized water is 1:1:0.1:30; 2mol / L ammonia water is added to the above solution to adjust the pH value of the solution to 8.0 to form a gel, and the condensed The gel was aged at 90°C for 12 hours; the aged gel was soaked in deionized water for 12 hours each time and soaked 3 times; the soaked gel was directly put into an oven for normal pressure drying at 200°C. The drying time was 24 hours to obtain polyalkylsiloxane airgel. The polyalkylsiloxane airgel was placed in a tube furnace, passed through Ar at a rate of 5 mL / min, heated to 1200 °C for 4 h at a heating rate of 5 °C / min, and then cooled naturally to obtain SiOC airgel.
[0029]The prepared polyalkylsiloxane airgel has a pore size distribution of 3...
Embodiment 3
[0032] Dissolve dimethyldiethoxysilane, ethyltrimethoxysilane and cetyltrimethylammonium bromide in deionized water to obtain a transparent solution, in which ethyltrimethoxysilane, dimethyldiethoxy The molar ratio of base silane, cetyltrimethylammonium bromide, and deionized water is 1:2:0.1:20; 1mol / L ammonia water is added to the above solution to adjust the pH value of the solution to 8.9 to form a gel, and the condensed The gel was aged at 60°C for 4 hours; the aged gel was soaked in deionized water for 8 hours each time and soaked 5 times; the soaked gel was directly put into an oven for normal pressure drying at 150°C. The drying time was 36 hours to obtain polyalkylsiloxane airgel. The polyalkylsiloxane airgel was placed in a tube furnace, passed through Ar at a rate of 4 mL / min, heated to 1200 °C for 8 h at a heating rate of 4 °C / min, and then cooled naturally to obtain SiOC airgel.
[0033] The pore size distribution of the prepared polyalkylsiloxane airgel is 200-8...
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