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Preparation method for corrosion-free SiO2 aerogel

An airgel, non-corrosion technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of airgel application restrictions, achieve high product quality, expand the application field, and ensure the effect of safety

Active Publication Date: 2016-01-13
北京建工新型建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in SiO 2 In the airgel preparation process, if the F - , Cl - or SO 4 2- The application of airgel in the above fields will be limited if the strong corrosive acid ions are controlled.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] According to the volume ratio of 1:5, mix industrial water glass and deionized water evenly, and remove Na through carboxylic acid-based cation exchange resin exchange. + , to obtain a sol with pH=3.0, and let it stand for 5h. The pH was then adjusted to 6.0 with ammonia to obtain a wet gel. Put the wet gel in the aging solution mixed with ethyl orthosilicate and ethanol for aging for 24h, the volume ratio of the wet gel to the aging solution is 1:1, and the mass ratio of ethyl orthosilicate and ethanol in the mixed solution is 1:4. The aged wet gel was placed in ethanol for solvent replacement 3 times, 12 hours each time, and the volume ratio of wet gel to ethanol was 1:1. The wet gel after solvent replacement was placed in the mixed solution of hexamethyldisilazane and ethanol for hydrophobic modification for 24 hours. The volume ratio of the wet gel to the modified solution was 1:1. Hexamethyldisilazane The mass ratio of ethanol in the mixture is 1:9. The surface...

Embodiment 2

[0035] According to the volume ratio of 1:10, mix industrial water glass and deionized water evenly, and remove Na through phosphate-based cation exchange resin exchange. +, to get a sol with pH=3.5, let it stand for 10h. The pH was then adjusted to 6.5 with ammonia to obtain a wet gel. Put the wet gel in the aging solution mixed with ethyl orthosilicate and ethanol for aging for 24h, the volume ratio of the wet gel to the aging solution is 1:1, and the mass ratio of ethyl orthosilicate and ethanol in the mixed solution is 1:4. The aged wet gel was placed in ethanol for solvent replacement 3 times, 12 hours each time, and the volume ratio of wet gel to ethanol was 1:1. The wet gel after solvent replacement was placed in the mixed solution of hexamethyldisilazane and ethanol for hydrophobic modification for 24 hours. The volume ratio of the wet gel to the modified solution was 1:1. Hexamethyldisilazane The mass ratio of ethanol in the mixture is 1:5. The surface-modified we...

Embodiment 3

[0038] According to the volume ratio of 1:20, mix industrial water glass and deionized water evenly, and remove Na through carboxylic acid-based cation exchange resin exchange. + , to obtain a sol with pH=4.0, and let it stand for 15h. The pH was then adjusted to 7.0 with ammonia to obtain a wet gel. Put the wet gel in the aging solution mixed with ethyl orthosilicate and ethanol for aging for 24h, the volume ratio of the wet gel to the aging solution is 1:1, and the mass ratio of ethyl orthosilicate and ethanol in the mixed solution is 1:4. The aged wet gel was placed in ethanol for solvent replacement 3 times, 12 hours each time, and the volume ratio of wet gel to ethanol was 1:1. The wet gel after solvent exchange was placed in the mixed solution of hexamethyldisilazane and ethanol for hydrophobic modification for 24 hours. The volume ratio of the wet gel to the modified solution was 1:1. The mass ratio of ethanol in the mixture is 1:4. The surface-modified wet gel was ...

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Abstract

The invention relates to a preparation method for corrosion-free SiO2 aerogel. The preparation method for the corrosion-free SiO2 aerogel adopts a sol-gel two-step method and comprises the steps of enabling a mixed solution of industrial water glass and deionized water to be subjected to exchange with weakly acidic cation exchange resin so as to remove Na<+> and obtain sol with the pH of 3.0-4.0, standing the sol, then, adjusting the pH value of the sol with ammonia water so as to obtain wet gel, then, aging the wet gel in an aging solution of ethyl orthosilicate and ethanol, putting the aged wet gel in ethanol for solvent replacement, then, putting the wet gel subjected to solvent replacement in a mixed solution of hexamethyldisilazane and ethanol for surface modification, then, putting the modified wet gel in ethanol for second-time solvent replacement, and finally, putting the wet gel in a carbon-dioxide supercritical drying kettle for supercritical drying, thereby preparing the SiO2 aerogel which has the advantages of no corrosion, excellent product performance and low process cost.

Description

technical field [0001] The present invention relates to SiO 2 The field of preparation of airgel, specifically relates to a non-corrosion SiO 2 Airgel preparation method. technical background [0002] Airgel is the lightest solid known in the world, its porosity can be as high as 99.8%, the pore size is 1~100nm, and the specific surface area can be as high as 1590m 2 / g, bulk density can be 3~500kg / m 3 It is a high-tech, environmentally friendly, high-efficiency and energy-saving insulation material. Its thermal conductivity can reach as low as 0.010W / (m K) at room temperature and pressure, which is the lowest thermal conductivity among solid materials known so far. kind of. Due to the unique structure and performance of airgel, this material is expected to have great application prospects in a wide range of fields such as aviation, aerospace, industrial energy saving, building energy saving, sound insulation, shock absorption, explosion protection, environmental protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 任富建李建平赵耀耀李智李路明张登平
Owner 北京建工新型建材有限责任公司
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