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High heat insulation transparent SiO2 aerogel film material and preparation method thereof

A thin film material and airgel technology, which is applied in the field of high thermal insulation transparent SiO2 airgel thin film material and its preparation, can solve the problems of unfavorable transparency, reduce the light transmittance of SiO airgel thin film, etc., and achieve moderate viscosity , low density, stable performance

Inactive Publication Date: 2010-07-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of TMCS modification can improve the SiO 2 Airgel film thermal insulation performance and hydrophobic performance, but due to the residual Cl in its tissue structure - , thus reducing the SiO 2 The light transmittance of the airgel film is not conducive to its good transparency

Method used

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  • High heat insulation transparent SiO2 aerogel film material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of acid catalyst solution and alkali catalyst solution

[0030] Measure 0.0418mL of concentrated hydrochloric acid (HCl) and 7.44mL of concentrated ammonia (NH 4 OH), were dissolved in 99.9164ml of absolute ethanol (CH 3 CH 2 OH) and 92.56ml deionized water (H 2 (0) in, be prepared into concentration and be the dilute ammonia solution of the hydrochloric acid dehydrated alcohol solution of 0.01mol / L and 1mol / L.

[0031] (2) SiO 2 Preparation of precursor sol

[0032] A. Add 40ml of tetraethyl orthosilicate, 14.66ml of absolute ethanol and 2.72ml of deionized water to a dry and clean beaker and mix them in turn. Stir vigorously at room temperature with a magnetic stirrer for 35 minutes of hydrolysis / polycondensation reaction; add 2.5 ml of hydrochloric acid absolute ethanol solution, and continuously stirred for 60 min to obtain the acid-catalyzed reaction product;

[0033] B. Add 1.76ml of dilute ammonia solution to the acid-catalyzed reaction prod...

Embodiment 2

[0046] (1) Preparation of acid catalyst solution and alkali catalyst solution

[0047] Measure 0.0418mL of concentrated hydrochloric acid (HCl) and 7.44mL of concentrated ammonia (NH 4 OH), were dissolved in 99.9164ml of absolute ethanol (CH 3 CH 2 OH) and 92.56ml deionized water (H 2 (0) in, be prepared into concentration and be the dilute ammonia solution of the hydrochloric acid dehydrated alcohol solution of 0.01mol / L and 1mol / L.

[0048] (2) SiO 2 Preparation of precursor sol

[0049] A. Add 30ml of tetraethyl orthosilicate, 11.43ml of absolute ethanol and 2.38ml of deionized water to a dry and clean beaker and mix them in sequence. Stir vigorously at room temperature with a magnetic stirrer for 30 minutes of hydrolysis / polycondensation reaction; add 2.06 ml of hydrochloric acid absolute ethanol solution, and continuously stirred for 80 minutes to obtain the acid-catalyzed reaction product;

[0050] B. Add 1.41ml of dilute ammonia solution to the acid-catalyzed reac...

Embodiment 3

[0062] (1) Preparation of acid catalyst solution and alkali catalyst solution

[0063] Measure 0.0418mL of concentrated hydrochloric acid (HCl) and 7.44mL of concentrated ammonia (NH 4 OH), were dissolved in 99.9164ml of absolute ethanol (CH 3 CH 2 OH) and 92.56ml deionized water (H 2 (0) in, be prepared into concentration and be the dilute ammonia solution of the hydrochloric acid dehydrated alcohol solution of 0.01mol / L and 1mol / L.

[0064] (2) SiO 2 Preparation of precursor sol

[0065] A. Add 50ml of tetraethyl orthosilicate, 19.79ml of absolute ethanol and 4.52ml of deionized water to a dry and clean beaker and mix them in turn. Stir vigorously at room temperature with a magnetic stirrer to carry out hydrolysis / polycondensation reaction for 45 minutes; add 3.77 ml of hydrochloric acid absolute ethanol solution, and continuously stirred for 66 minutes to obtain the acid-catalyzed reaction product;

[0066] B. Add 2.27ml dilute ammonia solution to the acid-catalyzed r...

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Abstract

The invention discloses a high heat insulation transparent SiO2 aerogel film material and a preparation method thereof, wherein the preparation method is realized by adopting a sol-gel technique to control the technological condition via using acid / alkali two-step catalytic method, and using hexamethyldisilazane (HMDS) to carry out organic hydrophobic modification on the surface of colloidal particles. The film material and the preparation method thereof are characterized in that the compound precursor sol has stable property, moderate viscidity and long gel time; the prepared aerogel heat insulation film not only has high porosity, low density and low hear conducting coefficient, but also has high light transmissivity and low refractive index, therefore, it is not only fits for the request of high head insulation, but also fits for the transparency request, and can be used as high heat insulation transparent layer of the landing glass of high-rise building and car glass; the row material for preparing aerogel heat insulation film is low in cost, and benefits for realizing commercial application.

Description

technical field [0001] The invention belongs to the field of porous thermal insulation transparent oxide film materials, in particular to a high thermal insulation transparent SiO 2 Airgel film material and its preparation method. Background technique [0002] SiO 2 Airgel (aergoels) is a kind of highly dispersed solid-state material in which colloidal particles or polymer molecules coalesce into a nanoporous network structure, and the pores are filled with a gaseous dispersion medium. It has a continuous and irregular fractal structure. SiO 2 Nanoporous morphology of airgel films with excellent properties. Due to SiO 2 Airgel nano-scale particles and their pore distribution, the small interconnected three-dimensional network structure constitutes a complex and tortuous heat flow transfer path, and the nanoporous structure has a pore size much smaller than the mean free path of heat-conducting carriers (such as phonons, etc.). Low thermal conductivity, SiO 2 Airgel can...

Claims

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Application Information

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IPC IPC(8): C01B33/14C01B33/158
Inventor 吴清仁吴启坚
Owner SOUTH CHINA UNIV OF TECH
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