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Fast preparation method of high-transmittance silica aerogel film

A silica and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of poor film mechanical properties, poor mechanical properties, long preparation cycle, etc., and achieve simple equipment and high volatilization rate Slow, mechanically good effect

Inactive Publication Date: 2015-05-13
YANGZHOU TIANCHEN FINE CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the surface of the film made of alkaline sol is composed of uniform SiO 2 Particle composition, but the mechanical properties are poor, and the preparation cycle is long; the film prepared by acidic sol has a relatively flat and dense surface, but the transmittance is low; while the film prepared by the acid-base two-step catalytic method has a relatively smooth surface, Dense, with similar granular surface characteristics, it has the advantages of both acid and alkali catalytic methods, but its steps are more complicated, and the mechanical properties of the film are also poor

Method used

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  • Fast preparation method of high-transmittance silica aerogel film
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  • Fast preparation method of high-transmittance silica aerogel film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 9.25ml tetraethyl orthosilicate to 26.20ml ethylene glycol methyl ether, stir and mix evenly, then add 3.00ml deionized water and 1.60ml N,N-dimethylformamide, continue stirring for 0.5h, and finally Slowly add 64 μl of 1 mol / L ammonium fluoride solution dropwise, and then stir for 10 minutes to form a silica sol.

[0033] The glass substrate was ultrasonicated with chloroform, acetone, ethanol, and deionized water for 0.5 h, and finally rinsed with deionized water and dried for use.

[0034] Clamp the cleaned and dried glass substrate with the fixture of the pull coater, place the silica sol directly under the glass substrate, adjust the height of the fixture, set the dipping time to 30s, and the pulling rate to 1000μm / s. Pull to obtain a silica wet gel film.

[0035] The obtained wet gel film was placed in a closed container in the atmosphere of ethylene glycol methyl ether and dried naturally. The thickness of the prepared silica airgel film was 115nm, the trans...

Embodiment 2

[0037] Add 9.40ml tetraethyl orthosilicate to 26.70ml ethylene glycol methyl ether, stir and mix evenly, then add 3.00ml deionized water and 0.80ml formamide, continue stirring for 0.5h, and finally slowly add 1 mol / L dropwise 66 μl of ammonium fluoride solution was stirred for 10 minutes to form a silica sol.

[0038] The glass substrate was ultrasonicated with chloroform, acetone, ethanol, and deionized water for 0.5 h, and finally rinsed with deionized water and dried for use.

[0039] Clamp the cleaned and dried glass substrate with the fixture of the pull coater, place the silica sol directly under the glass substrate, adjust the height of the fixture, set the dipping time to 30s, and the pulling rate to 1000μm / s. Pull to obtain a silica wet gel film.

[0040] The obtained wet gel film was placed in a closed container in the atmosphere of ethylene glycol methyl ether and dried naturally. The thickness of the prepared silica airgel film was 144nm, the transmittance was 90...

Embodiment 3

[0042] Add 11.70ml tetraethyl orthosilicate to 24.50ml ethanol, stir and mix evenly, then add 3.80ml deionized water and 1.50ml glycerol, continue stirring for 1h, and finally slowly add 1 mol / L ammonium fluoride solution dropwise 70 μl and stirred for 20 minutes to form a silica sol.

[0043] The glass substrate was ultrasonicated with chloroform, acetone, ethanol, and deionized water for 0.5 h, and finally rinsed with deionized water and dried for use.

[0044] Clamp the cleaned and dried glass substrate with the fixture of the pull coater, place the silica sol directly under the glass substrate, adjust the height of the fixture, set the dipping time to 20s, and the pulling rate to 750μm / s. Pull to obtain a silica wet gel film.

[0045] The obtained wet gel film was placed in a closed container in the atmosphere of ethylene glycol methyl ether and dried naturally. The thickness of the obtained silica airgel film was 140nm, the transmittance was 89.7% ~ 96.0%, and the specif...

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Abstract

The invention discloses a fast preparation method of a high-transmittance silica aerogel film, and belongs to the technical field of function materials. After tetraethoxysilane and ethylene glycol monomethyl ether, ethanol or methanol are uniformly mixed, deionized water and a dryness control chemical additive are added, the mixture is stirred uniformly, ammonium fluoride is added, and silica sol is obtained; a cleaned and dried glass substrate is immersed in the silica sol, constant-speed pulling and film coating are performed, and a wet gel film is obtained; the wet gel film is subjected to ambient pressure drying in the atmosphere of ethylene glycol monomethyl ether, and the silica aerogel film is obtained. The preparation period is greatly shortened, nucleophilic attack can be performed to form an intermediate state of a high coordination state, fluorine has lower electronegativity compared with oxygen, central silicon ions have higher electropositivity, a silicon oxygen bond is weakened, a gel polymerization reaction is facilitated, and the high-transmittance silica aerogel film with excellent mechanical property is formed.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation process of a silica airgel film. Background technique [0002] Silica airgel is a porous material with many special properties, it has high specific surface area, high porosity, low apparent density, high thermal insulation rate, ultra-low dielectric constant and small refractive index. These excellent properties make it have broad application prospects in the fields of rocket fuel storage, window heat insulation, sound insulation screens, optical films, supercapacitors, and catalyst carriers. [0003] Silica airgel film has the same advantages as bulk aerogel, its low density, adjustable refractive index, and high thermal stability make it suitable for solar cells, anti-reflection coatings, and anti-reflection coatings. [0004] Silica airgel films are usually prepared by alkaline sol, acidic sol or acid-base two-step catalysis. Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
Inventor 谢吉民陈高远魏巍陈国云刘润兴朱建军罗瑞余辉罗志斌
Owner YANGZHOU TIANCHEN FINE CHEM
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