Method for preparing elastic silica aerogel
A silica and aerogel technology, applied in the production of silica, silica, bulk chemicals, etc., can solve the problems of performance impact, low thermal stability temperature of samples, etc., to achieve the effect of good elasticity
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Embodiment 1
[0017] Measure 9ml of methyltriethoxysilane and 16.83ml of methanol according to the atomic molar ratio of 1:6.5, measure 1.458ml of oxalic acid solution with a molar concentration of 0mol / L according to the atomic molar ratio of 1:2, and magnetically stir for 30min to mix the reaction system Evenly, stand at room temperature for 12h. According to the atomic molar ratio of methyltriethoxysilane to ammonia water 1:6, measure 5.832ml of ammonia water with a molar concentration of 13.36mol / L, slowly add the ammonia solution dropwise to the reaction system, and magnetically stir for 30min to form a silica sol .
[0018] Leave the silica sol at room temperature until the gel is formed, age the gel at 60°C for 2 days, wash and replace it with methanol 5 times during this period, and dry the gel with supercritical fluid to obtain silica gas gel.
[0019] as attached figure 1 As shown in the scanning electron microscope (SEM) picture, the obtained elastic silica aerogel has a three...
Embodiment 2
[0021] Measure 6ml of methyltriethoxysilane and 22.44ml of methanol according to the atomic molar ratio of 1:13, measure 1.944ml of oxalic acid solution with a molar concentration of 0.001mol / L according to the atomic molar ratio of 1:4, and magnetically stir for 30min to make the reaction system Mix well and let it stand at room temperature for 24 hours to make it fully hydrolyzed. According to the atomic molar ratio of methyltriethoxysilane to ammonia water 1:4, measure 2.592ml of ammonia water with a molar concentration of 10mol / L, slowly add the ammonia solution dropwise to the reaction system, and magnetically stir for 30min to form a silica sol.
[0022] Put the silica sol at room temperature and wait until the gel is formed, age the gel at 40°C for 3 days, wash and replace it with methanol 7 times during this period, and dry the gel with supercritical fluid to obtain silica airgel.
[0023] as attached figure 2 As shown in the load-displacement curves of silica aerog...
Embodiment 3
[0025] Measure 4ml of methyltriethoxysilane and 22.44ml of methanol according to the atomic molar ratio of 1:19.5, measure 1.944ml of oxalic acid solution with a molar concentration of 0.1mol / L according to the atomic molar ratio of 1:6, and magnetically stir for 30min to make the reaction system Mix well and let it stand at room temperature for 36 hours to make it fully hydrolyzed. Measure 0.864 ml of ammonia water with a molar concentration of 6 mol / L according to the atomic molar ratio of methyltriethoxysilane to ammonia water 1:2, slowly add the ammonia solution dropwise to the reaction system, and magnetically stir for 30 minutes to form a silica sol.
[0026] Put the silica sol at room temperature and wait until the gel is formed, age the gel at 40°C for 3 days, wash and replace it with methanol 7 times during this period, and dry the gel with supercritical fluid to obtain silica airgel.
[0027] as attached figure 2 As shown in the load-displacement curves of silica ...
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