Method for preparing alcohol-dispersed silica sol
A silica sol and dispersion technology is applied in the field of silica sol to achieve the effects of low moisture content, long stability period and simple production process
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Embodiment 1
[0030] The ordinary alkaline silica sol with a silica content of 30% and a particle size of 10-30nm is passed through a strongly acidic cation exchange resin to prepare a 30% acidic silica sol.
[0031] Add 1000kg of the above-mentioned acidic silica sol to the polysulfone ultrafiltration membrane concentrator at room temperature, add the first batch of 700kg of absolute ethanol under stirring, mix well, and then open the concentrator to concentrate; when concentrated until the quality of the effluent reaches When it reaches 700kg, add the second batch of 700kg absolute ethanol to the raw material and stir and mix evenly, then continue to concentrate; Concentrate; end the ultrafiltration concentration when concentrated until the quality of the discharge liquid reaches 700kg. The moisture content in the measurement system was 87.8kg (4.88kmol).
[0032] Add appropriate amount of glacial acetic acid to the above-mentioned concentrated silica sol to adjust the pH=4-5, raise ...
Embodiment 2
[0034] Embodiment 2 [use methanol instead, the effect is satisfactory]
[0035] A 30% acidic silica sol is prepared by passing an ordinary alkaline silica sol with a silica content of 30% and a particle size of 30-50nm through a strongly acidic cation exchange resin.
[0036] Add 1000kg of the above-mentioned acidic silica sol to the polysulfone ultrafiltration membrane concentrator at room temperature, add the first batch of 800kg of methanol under stirring, mix well, and then open the concentrator to concentrate; when concentrated until the quality of the effluent reaches 800kg , add the second batch of 800kg methanol to the raw material and stir and mix evenly, and then continue to concentrate; When the quality of the effluent reaches 800kg, the ultrafiltration concentration is completed. The moisture content in the measurement system was 71.3kg (3.96kmol).
[0037] Add an appropriate amount of glacial acetic acid to the above-mentioned concentrated silica sol to adju...
Embodiment 3
[0039] Example 3 [use isopropanol instead, the effect is satisfactory]
[0040] A 30% acidic silica sol is prepared by passing an ordinary alkaline silica sol with a silica content of 20% and a particle size of 20-40nm through a strongly acidic cation exchange resin.
[0041] Add 1000kg of the above-mentioned acidic silica sol to the polysulfone ultrafiltration membrane concentrator at room temperature, add the first batch of 800kg of isopropanol under stirring, mix well, and then open the concentrator to concentrate; when concentrated until the quality of the effluent reaches When it reaches 800kg, add the second batch of 800kg isopropanol to the raw material and stir and mix evenly, then continue to concentrate; Concentrate; end the ultrafiltration concentration when concentrated until the quality of the discharged liquid reaches 800kg. The moisture content in the measurement system was 101.2kg (5.62kmol).
[0042] Add an appropriate amount of glacial acetic acid to th...
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