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Ultra-fast preparation method for highly transparent aerogel glass

An aerogel glass, ultra-fast technology, applied in glass production and other directions, can solve the problems of long cycle, high energy consumption and high cost of aerogel glass blocks

Active Publication Date: 2013-03-13
厦门纳美特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the existing preparation process is to dry after gelation. Due to the surface tension of the solvent inside the gel skeleton, even if the drying conditions are strictly controlled, the yield of the whole piece of airgel glass is still very low.
[0006] The traditional method of preparing airgel glass blocks has a long cycle and high energy consumption, resulting in high cost of airgel preparation

Method used

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  • Ultra-fast preparation method for highly transparent aerogel glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] With the molar ratio of ethyl orthosilicate: ethanol: distilled water being 1:6:3, take 44ml of ethyl orthosilicate, 72ml of ethanol, and 10.8ml of distilled water, add them to the container in turn, stir for 10min, add 0.03mol / L dilute Ammonia water 15ml, continue to stir for 10min, take out, and pour into the mold.

[0016] Put the mold into the autoclave, add 100ml of ethanol to the autoclave, vacuumize to -0.03MPa, flush nitrogen to 4MPa, heat at a heating rate of 8°C / min for 30min, at this time, the pressure is 12MPa, keep After 10 minutes, quickly release the pressure at a constant temperature at a rate of 0.45MPa / min to 0MPa in the autoclave, then quickly flush with nitrogen at a flow rate of 0.5L / min for 10 minutes, and open the autoclave after cooling to obtain a good formability gas condensation Adhesive glass, the whole process takes 90 minutes, and the glass is round.

Embodiment 2

[0018] With the molar ratio of ethyl orthosilicate: ethanol: distilled water as 1:8:3, take 88ml of ethyl orthosilicate, 192ml of ethanol, and 21.6ml of distilled water, add them to the container in turn, stir for 10min, add 0.03mol / L Dilute ammonia water 30ml, continue to stir for 10 minutes, take it out, and pour it into the mold.

[0019] Put the mold into the autoclave, add 100ml of ethanol to the autoclave, vacuumize to -0.03MPa, flush nitrogen to 3MPa, and heat at a heating rate of 8°C / min for 30min. At this time, the pressure is 15MPa, keep After 10 minutes, quickly release the pressure at a constant temperature of 0.5MPa / min to 0MPa in the autoclave, and then quickly flush it with nitrogen at a flow rate of 0.6L / min for 10 minutes. After cooling, open the autoclave to obtain a good formability. Adhesive glass, the whole process is 90min.

Embodiment 3

[0021] With the molar ratio of ethyl orthosilicate: ethanol: distilled water as 1:12:3, take 44ml of ethyl orthosilicate, 144ml of ethanol, and 14.4ml of distilled water, add them to the container in turn, stir for 10min, add 0.1mol / L Dilute ammonia water 15ml, continue to stir for 10 minutes, take it out, and pour it into the mold.

[0022] Put the mold into the autoclave, add 100ml of ethanol to the autoclave, vacuumize to -0.03MPa, flush nitrogen to 4MPa, heat at a heating rate of 10°C / min for 25min, at this time, the pressure is 13MPa, keep After 10 minutes, quickly release the pressure at a constant temperature at a rate of 0.45MPa / min to 0MPa in the autoclave, then quickly flush with nitrogen at a flow rate of 0.5L / min for 10 minutes, and open the autoclave after cooling to obtain a good formability gas condensation Plexiglas. The whole process is 75min.

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Abstract

The invention aims to provide an ultra-fast preparation method for highly transparent aerogel glass. The method comprises using tetraethyl orthosilicate and other silicon source precursors as well as ethanol and other solvents to prepared silica sol; putting the silica sol into a supercritical drying kettle, or pouring the silica sol into a die and putting the die into the supercritical drying kettle; rapidly heating, maintaining pressure and rapidly decompressing to prepare the aerogel glass with good completion. A whole preparation process can be completed in 2 hours, while traditional preparation processes need dozens of hours, and therefore the method greatly shortens time of the preparation process, increases production efficiency and improves yield of the aerogel glass. The aerogel glass prepared by the method has a visible light transmittance of more than 76 %, a density of less than 0.09 g / cm<3>, a thermal conductivity of less than 0.018 W / m*K, and a specific surface area of 800 to 1100 m<2> / g. The aerogel glass is resistant to high temperature, acid and alkali, is a new type of energy-efficient glass, and can be widely used in the fields of building energy efficiency, automobile and high temperature.

Description

technical field [0001] The invention relates to a method for ultra-fast preparation of airgel glass with low density, good heat insulation effect, strong light transmission, hydrophobicity and acid and alkali corrosion resistance, and specifically relates to the cooperation of sol-gel technology and fast supercritical drying technology To quickly prepare airgel glass with good integrity. Background technique [0002] Airgel is a new "miracle material that changes the world" in recent decades. Airgel, the English name aerogel, when the gel removes most of the solvent, the liquid content in the gel is much less than the solid content, or the space network structure of the gel is filled with gas, and the appearance is solid, That is airgel. Airgel contains a large amount of air, the typical pore size is in the range of 1-100nm, and the porosity is above 80%. its unique properties. They are obviously different from porous materials with pore structures on the order of micron...

Claims

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Application Information

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IPC IPC(8): C03B8/00
CPCY02P40/57
Inventor 余煜玺赖德林陈勇杨露林华坚赖淑金
Owner 厦门纳美特新材料科技有限公司
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