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A kind of ultra-high transparency large-size bulk silica airgel and its preparation method and application

A technology of silica and transparency, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve high heat insulation performance, large economic benefits, and reduce energy consumption and heat loss

Active Publication Date: 2022-03-08
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems existing in the prior art, the present invention provides an ultra-high transparency large-size bulk silica aerogel and its preparation method and application

Method used

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  • A kind of ultra-high transparency large-size bulk silica airgel and its preparation method and application
  • A kind of ultra-high transparency large-size bulk silica airgel and its preparation method and application
  • A kind of ultra-high transparency large-size bulk silica airgel and its preparation method and application

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preparation example Construction

[0034] In a first aspect, the present invention provides a method for preparing an ultrahigh-transparency large-size bulk silica aerogel, the method comprising the following steps:

[0035] (1) Silicon source methyl orthosilicate (TMOS silicon source), additive long-chain alkyl trimethoxysilane (C n TMOS), an alcohol solvent, water and an alkali catalyst are mixed uniformly and then hydrolyzed to obtain a sol, and then the sol is placed in a mold to perform a sol-gel reaction to obtain a wet gel;

[0036] (2) subjecting the wet gel to a gradient temperature aging step to obtain a skeleton-reinforced wet gel;

[0037] (3) Perform the steps of solvent replacement (such as solvent replacement in ethanol) and supercritical drying (such as supercritical carbon dioxide drying) of the skeleton-reinforced wet gel in sequence to obtain ultra-high transparency and large-size block silica gas gel.

[0038] The invention provides a method for preparing super-high transparency and large-...

Embodiment 1

[0061] ①Add 152g of methyl orthosilicate, 11.2g of octadecyltrimethoxysilane (additive) and 224g of methanol into a beaker, and stir mechanically at -20°C for 30min to obtain mixed solution A. Add 72g of deionized water and 710 μL of ammonia-methanol solution (concentration is 7mol / L) into the beaker, utilize mechanical stirring at room temperature for 3min, obtain mixed solution B (in this example, each component in the raw material is calculated by molar ratio of methyl orthosilicate Esters: Octadecyltrimethoxysilane: Methanol: Water: Ammonia (1:0.03:7:4:0.005). Add the mixed solution B to the mixed solution A drop by drop, and continue to maintain the hydrolysis reaction at -20°C for 90 minutes to obtain a sol; inject the above-mentioned cold sol close to the gel state into a detachable tetrafluoroethylene plate with an area of ​​16cm×16cm The sol-gel reaction was carried out in the mold at -20°C for 90 min to form a wet gel.

[0062] ②Put the above-mentioned flat mold wit...

Embodiment 2

[0067] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0068] In step ①, 152g of methyl orthosilicate, 3.73g of octadecyltrimethoxysilane and 64g of methanol were respectively added into the beaker, and stirred mechanically at -20°C for 30min to obtain a mixed solution A. Add 36g of deionized water and 426μL ammonia-methanol solution (concentration is 7mol / L) in the beaker, utilize mechanical stirring at room temperature for 3min, obtain mixed solution B (in this example, each component in the raw material is calculated by molar ratio of methyl orthosilicate Esters: Octadecyltrimethoxysilane: Methanol: Water: Ammonia (1:0.01:2:2:0.003). Add the mixed solution B to the mixed solution A drop by drop, and continue to maintain the hydrolysis reaction at -20°C for 90 minutes to obtain a sol. The above-mentioned cold sol close to the gel state is injected into a removable tetrafluoroethylene flat mold at -20°C The sol-gel reaction was carried out for 90 min...

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Abstract

The invention relates to an ultra-high transparency large-size block silica airgel and a preparation method and application thereof. The method is as follows: after uniformly mixing methyl orthosilicate, long-chain alkyltrimethoxysilane, alcohol solvent, water and alkali catalyst, performing a hydrolysis reaction to obtain a sol, and then placing the sol in a mold for sol-gel reaction to obtain a wet gel; the wet gel is subjected to gradient temperature aging to obtain a skeleton-reinforced wet gel; the skeleton-reinforced wet gel is subjected to solvent replacement and supercritical drying in sequence to obtain ultra-high transparency and large-size block silica gas gel. In the present invention, by introducing long-chain alkyl trimethoxysilane to stabilize the ultrafine silica sol produced by the hydrolysis of methyl orthosilicate, the reactivity of the sol can be controlled and adjusted, so as to realize the precise regulation of the gel process; the prepared by the present invention Airgel has the characteristics of ultra-high transparency, large size, super heat insulation capacity, super hydrophobicity, etc., and has great economic value in the field of transparent heat insulation.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and relates to a method for preparing silica airgel, in particular to an ultrahigh-transparency large-size bulk silica airgel and its preparation method and application. Background technique [0002] Silica airgel is the most typical representative of the airgel family, and it is also the most mature and widely used type of airgel material. The particles are interconnected to form a three-dimensional continuous nanoporous network structure. This structural feature endows silica aerogels with properties including ultra-low density, ultra-large specific surface area, ultra-high porosity, ultra-low dielectric constant, especially ultra-low thermal conductivity, etc. Many unique properties make silica airgel widely known as a super thermal insulation material. In addition, by controlling the particles and pores of silica airgel to be small and uniform, it has good light transmittance to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2006/10C01P2006/32C01P2006/60C01P2004/03
Inventor 张晚林刘圆圆李文静戴晶鑫李健杨洁颖赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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