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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

Active Publication Date: 2013-05-15
山东百特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of silica sol with low-boiling point alcohol as dispersant in the above prior art that does not have mass production, the invention provides a kind of ultrafiltration concentration and silane The production process combined with hydrolysis to prepare silica sol with low boiling point alcohol as dispersant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the technical field of silica sol, and in particular relates to a method for preparing alcohol-dispersed silica sol. The method comprises the following steps of: adding alcohol into acidic aqueous silica sol, concentrating by adopting an ultrafiltration concentration process till the solid content of the aqueous silica sol meets the requirement, adjusting the pH (potential of Hydrogen) to 4-5, heating to 40-50 DEG C and adding silane to carry out hydrolysis reaction. The method has the advantages that the silicon dioxide content of the obtained product is up to 20-40%; the particle size is 10-120nm; the water content is less than 1%; the stable period is greater than 6 months; the normal silica sol is adopted as the main raw material, so that the cost is low; and the ultrafiltration membrane process and the normal-pressure hydrolysis reaction are adopted, so that the production process is simple.

Description

technical field [0001] The invention relates to the technical field of silica sol, in particular to a method for preparing alcohol-dispersed silica sol. Background technique [0002] Silica sol is a dispersion of nano-silica particles with a particle size in the range of 1-100 nanometers in water or other organic solvents. It is widely used in precision casting, refractory materials, coatings, catalyst carriers, precision polishing and other fields. Silica sol can be divided into water-based silica sol and organic solvent-based silica sol according to the different dispersion media. Among them, silica sol with low boiling point alcohol (methanol, ethanol, isopropanol, etc.) Scratch coatings, aerospace coatings and other special coatings. [0003] At present, there are many domestic silica sol manufacturers, but most of them can only produce water-based silica sol. At present, there are no patents and papers related to the production of alcohol-dispersed silica sol by ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/145
Inventor 李春生李春光林栋
Owner 山东百特新材料有限公司
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