A kind of preparation method of fine silicon dioxide airgel powder
A silicon dioxide and airgel technology, applied in the direction of silicon dioxide and silicon oxide, can solve the problems of cumbersome process, long cycle time, high risk, etc., and achieve simple process flow, low raw material cost and low production cost Effect
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Embodiment 1
[0039] Mix 100g of sodium methyl silicate and 500g of water at room temperature to obtain a sodium methyl silicate solution, add 134g of hydrochloric acid (mass concentration: 36.5%) catalyst to the methyl silicate solution, and stir the reaction at 50°C 3h to obtain an acidic sol; add 1000g of n-hexane solvent to the acidic sol, add 200g of ammonia catalyst under the condition of high-speed stirring at 1500 rpm, heat and react at 50°C for 4h, wait for the solution to be separated and remove the water layer to obtain Silica wet gel: dry the silica wet gel at 130° C. for 6 hours, and pulverize to obtain silica airgel powder.
[0040] The particle size of the prepared silica airgel powder material is 0.1-50 μm, and the bulk density is 0.1 g / cm 3 , with a specific surface area of 300 m 2 / g, the thermal conductivity and thermal insulation coefficient is 0.022W / mK.
[0041] by attaching figure 1 It can be seen that the prepared silica airgel powder is a porous material with ...
Embodiment 2
[0043] Mix 100g of sodium methyl silicate and 900g of water at room temperature to obtain sodium methyl silicate solution, add 65.5g of sulfuric acid (concentration: 98.3%) catalyst to the methyl silicate solution, and stir the reaction at 10°C 5h to obtain an acidic sol; add 500g of n-hexane solvent to the acidic sol, add 10g of potassium hydroxide catalyst under the condition of high-speed stirring at 500 rpm, heat and react at 30°C for 5h, wait for the solution to be separated and remove the water layer , to obtain silica wet gel; dry the silica wet gel at 80° C. for 6 hours, and pulverize to obtain silica airgel powder.
[0044] The particle size of the prepared silica airgel powder material is 1~80μm, and the bulk density is 0.08g / cm 3 , with a specific surface area of 600 m 2 / g, the thermal conductivity and thermal insulation coefficient is 0.020W / mK.
Embodiment 3
[0046] Mix 100g of potassium methyl silicate and 600g of water at room temperature to obtain a potassium methyl silicate solution, add 120g of nitric acid (mass fraction about 65%) catalyst to the methyl silicate solution, and stir at 50°C React for 0.5h to obtain an acidic sol; add 5000g of n-hexane solvent to the acidic sol, add 50g of sodium hydroxide catalyst under the condition of high-speed stirring at 600 rpm, heat and react at 70°C for 0.5h, and wait for the solution to separate and separate The water layer was removed to obtain silica wet gel; the silica wet gel was dried at 140° C. for 5 hours and pulverized to obtain silica airgel powder.
[0047] The prepared silica airgel powder material has a particle size of 100-200 μm and a bulk density of 0.2 g / cm 3 , with a specific surface area of 600 m 2 / g, the thermal conductivity and thermal insulation coefficient is 0.013W / mK.
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