A kind of preparation method of reinforced silica airgel material
A technology of silica and airgel, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of low strength, easy cracks, and easy breakage, and achieve good strength, avoid cracks, and good stability Effect
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[0023] The preparation method of the reinforced silica airgel material of the present invention is: immersing the three-dimensional mullite whisker frame into SiO 2 In the sol, adjust to neutral after immersing in vacuum for 0.5-2h to obtain a wet gel; soak the wet gel in a mixture of tetraethyl orthosilicate and absolute ethanol for 24h, CO 2 Supercritical drying yields silica airgel-based materials reinforced with mullite whisker frameworks.
[0024] CO 2 During supercritical drying, the temperature of the reactor is 50-80°C, and the pressure is >9MPa.
[0025] SiO 2 The sol is prepared by the following process: the volume ratio of raw materials, water and ethanol is 1: (6-10): (2-4) and stirred evenly in a container, and the pH value is adjusted to 1-2 to obtain SiO 2 Sol A; wherein, the raw material is ethyl orthosilicate, methyl orthosilicate, silica sol or silica sol after water glass undergoes cation exchange.
[0026] The three-dimensional mullite whisker framework...
Embodiment 1
[0036] (1) According to the volume ratio, take 1 part of tetraethyl orthosilicate, 4 parts of deionized water, and 5 parts of ethanol in the container and stir them evenly, then add 0.3mol / L hydrochloric acid dropwise to adjust the pH to 1 to form Silica sol (SiO 2 Sol).
[0037] After mixing alumina micropowder, aluminum fluoride trihydrate and ethanol, adjust the pH value to 7-9, and wet mill with alumina ball for 24 hours to form a slurry; wherein, the mass ratio of alumina micropowder to aluminum fluoride trihydrate is 1:0.5.
[0038] In the slurry, the particle diameters of the alumina micropowder and the aluminum fluoride trihydrate powder are both less than 500nm.
[0039] (2) SiO in step (1) 2 The sol and slurry were mixed at a volume ratio of 1:1 by magnetic stirring to form a mullite precursor slurry. Then add 1mol / L ammonia water to catalyze the mullite precursor slurry to gradually gel in the cylindrical beaker to obtain a wet gel block;
[0040] (3) Dry the w...
Embodiment 2
[0046] (1) According to the volume ratio, take 1 part of tetraethyl orthosilicate, 5 parts of deionized water, and 8 parts of ethanol in a container and stir them evenly, and add 0.3mol / L hydrochloric acid dropwise to adjust the pH to 1 to form SiO 2 Sol.
[0047] After mixing alumina micropowder, aluminum fluoride trihydrate and ethanol, adjust the pH value to 7-9, and wet mill with alumina ball for 24 hours to form a slurry; wherein, the mass ratio of alumina micropowder to aluminum fluoride trihydrate is 1:0.35.
[0048] In the slurry, the particle diameters of the alumina micropowder and the aluminum fluoride trihydrate powder are both less than 500nm.
[0049] (2) SiO in step (1) 2 The sol and slurry were mixed at a volume ratio of 1:1 by magnetic stirring to form a mullite precursor slurry. Then add 1mol / L ammonia water to catalyze the mullite precursor slurry to gradually gel in the cylindrical beaker to obtain a wet gel block;
[0050] (3) Dry the wet gel block wit...
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