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Ambient preparation and control method of low-density SiO2 aerogel

A control method, airgel technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of many influencing parameters and difficult process control, and achieve the effect of feasible process control, low cost, and simple compression strength monitoring method

Inactive Publication Date: 2015-12-23
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0005] The present invention proposes a low-density SiO 2 The atmospheric pressure preparation control method of airgel solves the problem of low density SiO 2 The airgel preparation process has many influencing parameters and difficult process control. The present invention proposes a method to control SiO 2 Airgel density approach for easy realization of low-density hydrophobic SiO 2 Atmospheric pressure preparation and large-scale production application of airgel

Method used

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  • Ambient preparation and control method of low-density SiO2 aerogel
  • Ambient preparation and control method of low-density SiO2 aerogel
  • Ambient preparation and control method of low-density SiO2 aerogel

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Embodiment

[0060] The density is 62kg m -3 Hydrophobic SiO 2 The preparation control method of airgel is as follows:

[0061] Step 1, acid catalysis:

[0062] Mix ethyl orthosilicate with absolute ethanol, add deionized water and hydrochloric acid for acid catalysis, control the molar ratio of ethyl orthosilicate, absolute ethanol, deionized water and hydrochloric acid to 1:7:1:10 -5 ; Reaction obtains silica sol 1,

[0063] Step 2, base catalysis:

[0064] N,N-dimethylformamide, deionized water and ammonia water are mixed for base-catalyzed reaction to obtain silica sol 2; the molar ratio of the N,N-dimethylformamide, the deionized water and the ammonia water is 3×10 -4 :1:2×10 -3 .

[0065] Step 3, SiO 2 Alcohol gel preparation:

[0066] Mix the silica sol 1 obtained in step 1 and the silica sol 2 obtained in step 2, put them in a container, and let them stand for 0.5 to 48 hours to make SiO 2 alcohol gel;

[0067] Step four, the aging of alcohol gel:

[0068] Put the alcoh...

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Abstract

The invention provides an ambient preparation and control method of low-density SiO2 aerogel. The method comprises the following steps of mixing silica sol prepared through acid catalysis and alkaline catalysis methods to prepare the SiO2 aerogel; aging the prepared SiO2 aerogel, testing compression modulus of the aged SiO2 aerogel, and stopping aging when the compression modulus of the aerogel achieves 0.25 to 2.5kPa; then carrying out one-step method surface modification and solvent replacement on the aged SiO2 aerogel to obtain modified SiO2 aerogel; using normal hexane to clean the modified SiO2 aerogel for many times, and ambient pressure drying at the temperature of 60 to 90 DEG C to respectively prepare the low-density SiO2 aerogel. The compression strength monitoring method is simple, so that the low-density SiO2 aerogel preparation process control is more feasible. The adopted ambient preparation method is low in cost and simple in process, and can be used for mass production.

Description

technical field [0001] The present invention relates to SiO 2 The field of airgel preparation, in particular relates to a low-density SiO2 airgel preparation control method under normal pressure. Background technique [0002] SiO 2 Airgel is an amorphous nano-solid material with a spatial network structure. It has the characteristics of ultra-low thermal conductivity (lower than the same temperature without convective air), ultra-low density and hydrophobicity. It is used in industry, construction, aerospace and other fields. It has broad application prospects. However, the airgel preparation process usually requires supercritical drying, and the high-temperature and high-pressure process is costly and dangerous, which limits the large-scale production and large-scale application of aerogels. [0003] To avoid SiO 2 The high temperature and high pressure supercritical drying in the preparation process of airgel needs to control the parameters of the sol-gel process, supp...

Claims

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Application Information

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IPC IPC(8): C01B33/16
Inventor 吴会军陈奇良杨丽修胡焕仪
Owner GUANGZHOU UNIVERSITY
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