Method for preparing SiO2 aerogel with nanometer apertures under normal pressure
An aerogel and nanopore technology, applied in the fields of silica, bulk chemical production, silicon oxide, etc., can solve the problems of reduced thermal conductivity of products, high cost, long cycle time, etc. Low cost and good hydrophobicity
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[0021] 1. Add in the order of water glass, sulfuric acid, water, glycerin, and n-butylamine. Water glass / sulfuric acid = 0.7 to 1 (molar ratio), the fixed PH value is about 8 to form a gel, and the aging time is generally 4 to 8 hours. The above-mentioned colloid was aged for several days, washed with water, then washed with ethanol several times, then washed with n-hexane, finally washed with n-hexane and TMCS, filtered, and then placed in a drying box for constant temperature drying, calcined to remove organic matter, and obtained nanoporous structure SiO 2 Aerogel.
[0022] 2. Add in the order of water glass, formamide, acetic acid, water, ethylene glycol, and n-butylamine, water glass / formamide = 0.6-1 (molar ratio). The water includes the water in the water glass. The order of addition is that the water glass is added with water, then diluted formamide is added, then acetic acid and template are added and stirred for a few minutes. Dry at room temperature, then put it in a dr...
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