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Method for preparing silicon-based aerogel with different contact angles by drying with low cost under normal pressure

A technology of atmospheric drying and airgel, applied in the direction of silicon oxide, silicon dioxide, etc., which can solve the problems of low safety factor, high energy consumption, restrictions on industrial production and practical application, etc.

Inactive Publication Date: 2011-09-28
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, SiO 2 The preparation of airgel mainly uses tetraethyl orthosilicate, polypolysiloxane, polydiethoxysiloxane, etc. as silicon sources, and adopts sol-gel method to obtain porous structure through supercritical drying technology. These silicon sources Most of the expensive supercritical drying technology requires high equipment requirements, high energy consumption and low safety factor, which limits industrial production and practical application

Method used

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  • Method for preparing silicon-based aerogel with different contact angles by drying with low cost under normal pressure
  • Method for preparing silicon-based aerogel with different contact angles by drying with low cost under normal pressure
  • Method for preparing silicon-based aerogel with different contact angles by drying with low cost under normal pressure

Examples

Experimental program
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example 1

[0016] Weigh 3.8 g of sodium metasilicate nonahydrate, add it to 20 ml of deionized water, and stir in a 60 ℃ water bath for 20 min. After the solution is cooled, add 4 ml of glacial acetic acid solution dropwise. Show acidity, stand in a 60 ℃ water bath, gelatinize after a few hours to obtain a silica wet gel, aged for 2 days; add deionized water in a 60 ℃ water bath for immersion and cleaning for 24 h; add 15-25 ml absolute ethanol, exchange the water in the gel twice within 48 hours (soak the gel with ethanol and replace it once in 24 hours), and then use 15-25 ml of n-hexane to exchange the ethanol in the gel twice within 48 hours. Wet gels were immersed in n-hexane / trimethylchlorosilane solutions with different ratios (the molar ratio of silicon content in wet gel to trimethylchlorosilane was Si : TMCS = 1:1), and the surface modification was carried out at 50 °C. After 24 hours, add 15-25 ml of n-hexane to exchange the unreacted modifier twice within 24 hours, seal the b...

example 2

[0018] Weigh 3.8 g of sodium metasilicate nonahydrate, add it to 20 ml of deionized water, and stir in a 60 ℃ water bath for 20 min. After the solution is cooled, add 4 ml of glacial acetic acid solution dropwise. Show acidity, stand in a 60 ℃ water bath, gelatinize after a few hours to obtain a silica wet gel, aged for 2 days; add deionized water in a 60 ℃ water bath for immersion and cleaning for 24 h; add 15-25 ml absolute ethanol, exchange the water in the gel twice within 48 hours (soak the gel with ethanol and replace it once in 24 hours), and then use 15-25 ml of n-hexane to exchange the ethanol in the gel twice within 48 hours. Wet gels were immersed in n-hexane / trimethylchlorosilane solutions with different ratios (the molar ratio of silicon content in wet gel to trimethylchlorosilane was Si : TMCS = 1:2), and the surface modification was carried out at 50 °C. After 24 hours, add 15-25 ml of n-hexane to exchange the unreacted modifier twice within 24 hours, seal the b...

example 3

[0020] Weigh 3.8 g of sodium metasilicate nonahydrate, add it to 20 ml of deionized water, and stir in a 60 ℃ water bath for 20 min. After the solution is cooled, add 4 ml of glacial acetic acid solution dropwise. Show acidity, stand in a 60 ℃ water bath, gelatinize after a few hours to obtain a silica wet gel, aged for 2 days; add deionized water in a 60 ℃ water bath for immersion and cleaning for 24 h; add 15-25 ml absolute ethanol, exchange the water in the gel twice within 48 hours (soak the gel with ethanol and replace it once in 24 hours), and then use 15-25 ml of n-hexane to exchange the ethanol in the gel twice within 48 hours. Wet gels were immersed in n-hexane / trimethylchlorosilane solutions with different ratios (the molar ratio of silicon content in wet gel to trimethylchlorosilane was Si : TMCS = 1:6), and surface modification was carried out at 50 °C. After 24 hours, add 15-25 ml of n-hexane to exchange the unreacted modifier twice within 24 hours, seal the beake...

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Abstract

The invention relates to a method for preparing silicon-based aerogel with different contact angles by drying with low cost under normal pressure, and belongs to the technical field of novel material preparation. The method comprises the following steps of: mixing a certain amount of sodium metasilicate nonahydrate and deionized water in a breaker, arranging a rotor to seal the breaker, stirring in a water bath of 35 to 60 DEG C, cooling after 20 to 40 minutes, dropwise adding glacial acetic acid, regulating the pH to be acidic, ageing for 2 to 6 days after gel is formed, adding distilled water, soaking and cleaning for 24 hours in the water bath of 35 to 60 DEG C, immersing the wet gel into the modified n-hexane / trimethylchlorosilane solution, performing surface modification for 24 hours at the temperature of 50 DEG C, adding a certain amount of n-hexane to exchange the un-reacted modifier twice in 24 hours, sealing the breaker by using a preservative film with pin holes and an aluminum foil, performing graded drying under normal pressure, and finally cooling to room temperature to obtain the modified silicon-based aerogel. The method has the advantages of low cost, low energy consumption and easily controlled reaction.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, in particular to a method for preparing silicon-based aerogels by low-cost atmospheric drying, particularly a method for preparing silicon-based aerogels with different contact angles by one-step acid catalysis and atmospheric drying. Background technique [0002] Silicon-based aerogel is a new type of lightweight nanoporous material with many excellent properties, such as: large specific surface area (600-1000 m2 g-1), high porosity (80%-99.8%), porous It has the characteristics of uniform distribution, and its thermal conductivity, refractive index, elastic modulus, and acoustic impedance are very low, which makes SiO 2 Aerogels have very broad application prospects in the fields of acoustic impedance coupling materials, thermal insulation materials, catalysts and their carriers. Currently, SiO 2 The preparation of aerogels mainly uses ethyl orthosilicate, polysiloxane, polyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 朱建军魏巍谢吉民荆俊杰陈国云刘润兴
Owner JIANGSU UNIV
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