Preparation method of high-temperature-resisting aerogel material
An airgel and high-temperature-resistant technology, which is applied in the field of preparation of high-temperature-resistant airgel materials, can solve problems such as insufficient temperature resistance, potential safety hazards, and failure to consider material temperature resistance, so as to overcome shrinkage, inhibit sintering, The effect of inhibiting growth
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[0036] The present invention provides a method for preparing a high-temperature resistant aerogel material. The method includes the following steps:
[0037] (1) Preparation of sol: siliceous sol is prepared with organosilicon ester as raw material, acidic reagent as catalyst and organic solvent as dispersant. The organosilicon ester is preferably methyl orthosilicate or ethyl orthosilicate; the acidic reagent is selected from the group consisting of hydrochloric acid, hydrofluoric acid and nitric acid, and the concentration of the acidic reagent is 0.001 to 0.1 mol / L ( For example, 0.001, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1 mol / L); the organic solvent is selected from the group consisting of methanol, ethanol, acetone and acetonitrile.
[0038] (2) Nanocrystal assembly process: dissolve the oxide nanopowder in an organic solvent to obtain a first mixed solution, then add the siliceous sol prepared in step (1) to the first mixed solution, and perform ...
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[0053] Example 1
[0054] ①Sol preparation
[0055] Weigh 160 g of methyl orthosilicate and 160 g of acetonitrile in a 500 mL beaker, seal them with plastic wrap and perform magnetic stirring for 1 min. After mixing uniformly, add 60 g of hydrochloric acid with a concentration of 0.003 mol / L as a catalyst. This process requires slow addition and magnetic stirring for 5 minutes; the above mixture is added to a 1000 mL three-neck flask, heated and magnetically stirred at 70°C, With reflux for 30 minutes, the first solution of the siliceous sol precursor was obtained; 160g of methyl orthosilicate was added to the obtained first solution of the siliceous sol precursor, and heating and magnetic stirring were continued at 70°C for 16 hours. A siliceous sol (silica sol) is obtained. The siliceous sol is diluted, 300g of the solvent contained in the siliceous sol is evaporated, and 600g of acetonitrile is added and mixed uniformly to obtain a diluted siliceous sol, and the diluted silice...
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[0067] Example 2
[0068] Example 2 is basically the same as Example 1, except that during the heat treatment, the heat treatment temperature is 1100°C.
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