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Preparation method of transparent silicon dioxide aerogel

A technology of silica and airgel, applied in the field of airgel, can solve the problems of poor mechanical strength, high cost, and long synthesis cycle, and achieve the effect of good blockability, low cost, and uniform size

Active Publication Date: 2013-01-30
ZHONGKE RUNZI (CHONGQING) ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Since 2006, foreign Sharad.D Bhagat has added multifunctional surface modifiers during the gel formation process, and prepared silica airgel powder with water glass as the precursor under normal pressure drying process, with a specific surface area of ​​473~776m 2 / g, density 0.1~0.309g / cm 3 , the sample obtained by this method is an opaque white powder with poor mechanical strength
However, there are few studies on how to apply this method to prepare silica airgel from water glass.
[0013] At present, the main problems in the research on the preparation of silica airgel using water glass as the precursor include: long synthesis period, excessive consumption of solution and silicone modifier during the synthesis process, resulting in high cost; airgel synthesis Poor performance; there is a certain amount of residual impurities in the pores of the airgel, etc.

Method used

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  • Preparation method of transparent silicon dioxide aerogel
  • Preparation method of transparent silicon dioxide aerogel
  • Preparation method of transparent silicon dioxide aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The molar ratio of raw materials is: water glass: MTES: water=1: 0.3: 35, the MTES of 1.7ml, the water glass solution of 5ml and the deionized water of 12.5ml are mixed and stirred for 48h, and then the mixed solution is passed into 25ml of strong acid In the styrene resin, after 10 minutes, the silica sol with pH = 2~3 was obtained by suction filtration, and a certain amount of ammonia water was added while stirring, so that the final pH value of the system was 8.0. After 10 minutes, the stirring was stopped, and the SiO 2 The sol was allowed to stand for 24 hours until the sample gelled. Put the gel in absolute ethanol solution for aging and solvent replacement. The aging temperature is 30°C. After aging, the gel sample is immersed in the solution. The volume ratio of the ingredients is trimethylchlorosilane (TMCS): absolute ethanol: n-hexane =1 (4ml): 1:8 mixed solution modified for 2 days, the modified solution was washed away with n-hexane, and the sample was soake...

Embodiment 2

[0045]The molar ratio of raw materials is: water glass: MTMS: water=1: 0.3: 38, the MTMS of 1.7ml, the water glass solution of 5ml and the deionized water of 13.5ml are mixed and stirred for 24h, and then the mixed solution is passed into 25ml of strong acid In the styrene resin, filter the silica sol with pH=2~3 after 10 minutes, and add a certain amount of ammonia water while stirring, so that the final pH value of the system is about 8.0. After 10min, the stirring was stopped, and the SiO 2 The sol was allowed to stand for 24 hours until the sample gelled. Put the gel in absolute ethanol solution for aging and solvent replacement. The aging temperature is 30°C. After aging, the gel sample is immersed in the solution. The volume ratio of ingredients is TMCS: absolute ethanol: n-hexane = 1 (4ml): 3 : 6 in the mixed solution of modification for 2 days, wash off the modified solution with n-hexane, soak the sample in normal hexane and dry it under normal pressure, and the dryi...

Embodiment 3

[0048] Raw material molar ratio is: water glass: MTES: water=1: 0.2: 40, the MTES of 2.3ml, the water glass solution of 5ml and the deionized water of 14.3ml are mixed and stirred for 24h, then the mixed solution is passed into 25ml of strongly acidic benzene In the vinyl resin, after 10 minutes, suction filter to obtain the silica sol with pH=2~3, and add a certain amount of ammonia water while stirring, so that the final pH value of the system is about 8.0. After 10min, the stirring was stopped, and the SiO 2 The sol was allowed to stand for 24 hours until the sample gelled. Put the gel in absolute ethanol solution for aging and solvent replacement. The aging temperature is 30°C. After aging, the gel sample is immersed in the solution. The volume ratio of ingredients is TMCS: absolute ethanol: n-hexane = 1 (4ml): 1 : 8 in the mixed solution modified for 2 days, the modified solution was washed away with n-hexane, the sample was soaked in normal hexane and dried under normal...

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Abstract

The invention relates to aerogel and provides a preparation method of transparent silicon dioxide aerogel, which has the advantages of low cost, simple process, short production period, controllable reacting process and continuous production and adopts secondary modification process and normal-pressure drying steps. The preparation method comprises the following steps: 1) solution preparation and silicon source co-precursor hydrolysis; 2) ion exchange and silicon dioxide hydrogel preparation by using gel; and 3) aging, alcoholizing, modifying and normal-pressure drying of the silicon dioxide gel.

Description

technical field [0001] The invention relates to an airgel, in particular to a preparation method of a transparent silica airgel which uses industrial water glass as a raw material, adopts a secondary modification method, replaces a rapid solvent, and dries under normal pressure. Background technique [0002] Silicon dioxide (SiO 2 ) Airgel is a solid phase particle, a new type of porous functional material whose pore size is on the nanometer scale, and the continuous three-dimensional network structure can be controlled and tailored at the nanometer scale. Silica aerogels are sometimes called "solid smoke" or "frozen smoke" because of their translucency and ultra-light weight. Silica airgel has many unique properties, such as high specific surface area, high porosity, high thermal insulation, low density, ultra-low dielectric constant and low refractive index, etc., and its properties can be improved with the control of its structure. Continuous adjustability. The excelle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 程璇邵再东张霄翔
Owner ZHONGKE RUNZI (CHONGQING) ENERGY SAVING TECH CO LTD
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