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Preparation method of high transparency silicon dioxide aerogel

A silicon dioxide, high light transmittance technology, applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve problems such as limited heat insulation effect, damaged air leakage, slow vacuum leakage, etc.

Inactive Publication Date: 2017-09-01
浙江省普瑞科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, since the particle size of the airgel skeleton is 1-20nm, which is smaller than the wavelength of visible light, it also has a certain degree of light transmission, but most of them are in a translucent state, such as the conventional one-step normal pressure drying process. The light transmittance of silica airgel particles is about 55%.
[0003] At present, there are vacuum glass, filmed glass, and heat-reflecting glass in the heat-insulating and lighting glass series for civilian use. Among them, vacuum glass has the best heat-insulating effect, but because the vacuum usually leaks slowly (even if there is no external force), and the external force It is easier to leak air due to damage, and because the vacuum glass has a support frame between the two layers, these reasons ultimately lead to a limited overall heat insulation effect, which cannot be compared with the heat-insulating and daylighting glass filled with airgel in the middle. Therefore, By further improving the preparation technology of airgel, the light transmittance of airgel can be increased, so that it can be used to manufacture high-performance heat-insulating lighting glass and solar collectors, and its application potential is huge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, tetraethyl orthosilicate is used as silicon source, absolute ethanol is used as solvent, water is used as hydrolyzing agent, hydrochloric acid solution and sodium hydroxide solution are respectively acid-base catalysts, and N,N-dimethylformamide is used as additive, without Water and ethanol are used as the aging solution, and the supercritical drying of ethanol is used to prepare silica airgel particles with high light transmittance.

[0020] The preparation method of the silica airgel particles with high light transmittance is as follows:

[0021] a) Add the above materials in turn in the beaker according to the volume ratio of ethyl orthosilicate: absolute ethanol: water = 1:1:0.5, place the beaker on a magnetic stirrer with heating, and stir well.

[0022] b) Add 8% hydrochloric acid solution dropwise to the mixture in step a) until the pH is 3, heat to 50°C, stir evenly, seal and keep warm for 2 hours to make a sol.

[0023] c) Mix the sol prod...

Embodiment 2

[0027] In this embodiment, methyl orthosilicate is used as silicon source, anhydrous methanol is used as solvent, water is used as hydrolyzing agent, hydrochloric acid solution and sodium hydroxide solution are respectively acid-base catalysts, and N, N-dimethylformamide is used as additive. Water and ethanol are used as the aging solution, and the supercritical drying of ethanol is used to prepare silica airgel particles with high light transmittance.

[0028] The preparation method of the silica airgel particles with high light transmittance is as follows:

[0029] a) Add the above materials in turn in the beaker according to the ratio of methyl orthosilicate: anhydrous methanol: water = 1:1:0.5, place the beaker on a magnetic stirrer with heating, and stir well.

[0030] b) Add 8% hydrochloric acid solution dropwise to the mixture in step a) until the pH is 3.5, heat to 55°C, stir evenly, seal and keep warm for 2.5 hours to make a sol.

[0031] c) Mix the sol prepared in s...

Embodiment 3

[0035] In this embodiment, tetraethyl orthosilicate is used as silicon source, absolute ethanol is used as solvent, water is used as hydrolyzing agent, hydrochloric acid solution and sodium hydroxide solution are respectively acid-base catalysts, N,N-dimethylformamide is used as additive, aging According to the ratio of absolute ethanol: hexamethyldisilazane = 9:1, the liquid is supercritically dried with carbon dioxide to prepare silica airgel particles with high light transmittance.

[0036] The preparation method of the silica airgel particles with high light transmittance is as follows:

[0037] a) Add the above materials in sequence in the beaker according to the ratio of ethyl orthosilicate: absolute ethanol: water = 1:1:0.5, place the beaker on a magnetic stirrer with heating, and stir well.

[0038] b) Add 8% hydrochloric acid solution dropwise to the mixture in step a) until the pH is 4, heat to 60°C, stir evenly, seal and keep warm for 2.5 hours to form a sol.

[00...

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Abstract

The invention relates to a preparation method of a high transparency silicon dioxide aerogel. The preparation method comprises the following steps: by taking a silicon source, a solvent and water as primary raw materials, a hydrochloric acid solution and a sodium hydroxide solution as a catalyst, and N,N-dimethylformamide as an additive, preparing a gel by means of an acid-base two-step process sol-gel process; and by taking absolute ethyl alcohol or absolute ethyl alcohol added with hexamethyl disilazane as an aging liquid, performing aging and supercritical drying to prepare the blocky silicon dioxide aerogel with good transparency. The preparation method is simple in process and low in cost, and the prepared material has a nanohole structure, the light transparency is 85% above, and the aerogel has a wide application prospect in the field of solar thermal collectors, thermal insulation and lighting windows and the like.

Description

technical field [0001] The invention relates to a preparation method of silica airgel, in particular to a preparation method of silica airgel with relatively high light transmittance. Background technique [0002] Silica airgel is the solid material with the lowest density and the smallest thermal conductivity known in the world. It is a kind of nanoporous network formed by the aggregation of nanometer-scale ultrafine silica particles. An amorphous and highly dispersed solid material filled with a gaseous dispersion medium. It has both macroscopic properties and nano-effects so that it has ultra-low thermal conductivity. The thermal conductivity is usually less than 0.020W / m.k at normal temperature and pressure. The lowest can be as low as 0.013W / m.k, and it can be as low as 0.004W / m.k in vacuum state. At the same time, since the particle size of the airgel skeleton is 1-20nm, which is smaller than the wavelength of visible light, it also has a certain degree of light trans...

Claims

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Application Information

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IPC IPC(8): C01B33/16
CPCC01B33/163C01P2006/10
Inventor 王虹李荣年李红祝胡晓东
Owner 浙江省普瑞科技有限公司
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