Preparation method of aerogel
An aerogel and hydrogel technology, which is used in the preparation of silica aerogel and in the field of aerogel preparation, can solve the problem that chemicals cannot be recovered or reused, a large amount of acid and salt-containing wastewater, and unfavorable environment. protection and other issues, to achieve the effect of protecting the ecology and environment, consuming resources, and reducing the cost of raw materials
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Embodiment 1
[0033] Take a sodium silicate with a Baume degree of 37°Be' (20°C, the same below), add 4 times the amount (weight, the same below) of water to dilute, filter, and measure the diluent containing SiO 2 %=5.0%, Na 2 O%=1.4%, its modulus n=3.7, weighs 600g of this dilute solution, mixes with 600g 3.8% NaHCO under stirring 3 The solution is mixed (the reaction molar ratio is 1:2.0), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, stop stirring, and after standing for 1 day, filter to remove about 600g of washing water, save the washing water for later use, add about 1200g of water to the gel, stir for about 10 minutes, let stand for 1 day, filter and divide Remove the washing water, continue to add water, let stand, filter, drain, wash the gel several times with ethanol, add the gel to the ethanol solution of TEOS to soak, age for 2 days, drain, and then soak in ethanol for 1 Days later, slowly heat up and dry to obtain about 2...
Embodiment 2
[0037] Take a sodium silicate with a Baume degree of 41°Be', add 3 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 % = 6.7%, Na 2 O% = 2.1%, its modulus n = 3.3, weigh 600g of the dilute solution, mix it with 600g of 2.7% NH under stirring 4 HCO 3 The solution is mixed (the reaction molar ratio is 1:1.0), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, stop stirring, and after standing for 1 day, filter to remove about 600g of washing water, save the washing water for later use, add about 1200g of water to the gel, stir for about 10 minutes, let stand for 1 day, filter and divide Remove the washing water, continue to add water, stand still, filter, drain, wash the gel with ethanol, then add ethanol and let it stand for 12 hours, wash the gel with ethanol, add ethanol and let it stand, after repeated several times, use supercritical drying After removing the solvent, about 3...
Embodiment 3
[0040] Take a sodium silicate with a Baume degree of 40°Be', add 4 times the amount of water to dilute, filter, and measure that the diluted solution contains SiO 2 % = 5.4%, Na 2 O%=1.8%, its modulus n=3.1, weighs 600g of this dilute solution, under stirring with 650g 4.8% NaHCO 3 The solution is mixed (the reaction molar ratio is 1:2.1), until there is basically no SiO in the test liquid phase 2 , continue to stir for about 15 minutes, stop stirring, after standing for 1 day, filter and wash about 650g of water, save for later use, add about 1200g of water to the gel, stir for about 10 minutes, let stand for 1 day, filter and divide Remove the washing water, continue to add water, let stand, filter, drain, wash the gel several times with ethanol, drain, add the gel to trimethylchlorosilane (TMCS) and hexamethyldisiloxane (HMDSO ) in the mixed solution of the surface modification treatment, after the modification treatment is completed, slowly heat up and dry, and about 30 ...
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