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Preparation method of SiOC aerogel with high compression strength
The invention relates to a preparation method of SiOC aerogel with high compression strength. The preparation method comprises the following steps: uniformly mixing deionized water, absolute ethyl alcohol and N, N-dimethylformamide, then sequentially adding methyltrimethoxysilane and vinyltriethoxysilane into a mixed solution, and then adding glacial acetic acid to fully hydrolyze the mixed solution to form silane sol; then adding ammonia water with the volume concentration of 25-28% into the sol, fully and uniformly stirring, and standing to obtain silane wet gel; and soaking the wet gel in absolute ethyl alcohol to be aged, then carrying out solvent replacement in n-hexane, drying the wet gel to obtain silane aerogel, heating the silane aerogel to 800-1300 DEG C in an inert atmosphere, carrying out heat preservation for 1-3 hours, and then performing natural cooling to room temperature, so as to obtain the SiOC ceramic aerogel. The aerogel is uniform in microstructure, the compressive strength is 8.8-9.5 MPa, and the aerogel is a SiOC aerogel material with the highest compressive strength.
本发明涉及一种高压缩强度SiOC气凝胶的制备方法。将去离子水、无水乙醇和N,N‑二甲基甲酰胺混合均匀、然后将甲基三甲氧基硅烷和乙烯基三乙氧基硅烷依次加入该混合溶液中，随后加入冰醋酸使该混合溶液充分水解，形成硅烷溶胶；然后在溶胶中加入25～28％体积浓度的氨水，充分搅拌均匀后静置得到硅烷湿凝胶；将湿凝胶浸泡在无水乙醇中老化，紧接着在正己烷中进行溶剂置换，将湿凝胶干燥，得到硅烷气凝胶，最后将硅烷气凝胶在惰性气氛中加热升温至800～1300℃并保温1～3小时，然后自然冷却至室温，得到SiOC陶瓷气凝胶。气凝胶微观结构均匀，抗压缩强度8.8～9.5MPa，是抗压缩强度最高的SiOC气凝胶材料。
Preparation method of SiOC aerogel with high compression strength
The invention relates to a preparation method of SiOC aerogel with high compression strength. The preparation method comprises the following steps: uniformly mixing deionized water, absolute ethyl alcohol and N, N-dimethylformamide, then sequentially adding methyltrimethoxysilane and vinyltriethoxysilane into a mixed solution, and then adding glacial acetic acid to fully hydrolyze the mixed solution to form silane sol; then adding ammonia water with the volume concentration of 25-28% into the sol, fully and uniformly stirring, and standing to obtain silane wet gel; and soaking the wet gel in absolute ethyl alcohol to be aged, then carrying out solvent replacement in n-hexane, drying the wet gel to obtain silane aerogel, heating the silane aerogel to 800-1300 DEG C in an inert atmosphere, carrying out heat preservation for 1-3 hours, and then performing natural cooling to room temperature, so as to obtain the SiOC ceramic aerogel. The aerogel is uniform in microstructure, the compressive strength is 8.8-9.5 MPa, and the aerogel is a SiOC aerogel material with the highest compressive strength.
本发明涉及一种高压缩强度SiOC气凝胶的制备方法。将去离子水、无水乙醇和N,N‑二甲基甲酰胺混合均匀、然后将甲基三甲氧基硅烷和乙烯基三乙氧基硅烷依次加入该混合溶液中，随后加入冰醋酸使该混合溶液充分水解，形成硅烷溶胶；然后在溶胶中加入25～28％体积浓度的氨水，充分搅拌均匀后静置得到硅烷湿凝胶；将湿凝胶浸泡在无水乙醇中老化，紧接着在正己烷中进行溶剂置换，将湿凝胶干燥，得到硅烷气凝胶，最后将硅烷气凝胶在惰性气氛中加热升温至800～1300℃并保温1～3小时，然后自然冷却至室温，得到SiOC陶瓷气凝胶。气凝胶微观结构均匀，抗压缩强度8.8～9.5MPa，是抗压缩强度最高的SiOC气凝胶材料。
Preparation method of SiOC aerogel with high compression strength
一种高压缩强度SiOC气凝胶的制备方法
JI HUIMING (author) / ZHOU YUGUI (author) / TONG ZONGWEI (author)
2022-01-21
Patent
Electronic Resource
Chinese
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