Preparation method of aerogel

An airgel and hydrogel technology, applied in the field of airgel, can solve problems such as environmental pollution, a large amount of organic solvents, and complicated processes

Pending Publication Date: 2022-06-24
纳诚(邢台)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

The process is complex and requires the use of a large amount of organic solvents, which is likely to cause environmental pollution

Method used

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  • Preparation method of aerogel
  • Preparation method of aerogel

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preparation example Construction

[0034] The invention provides a preparation method of aerogel, comprising the following steps:

[0035] The acidic aqueous solution of the surfactant is subjected to hydrolysis condensation reaction with the tetrafunctional siloxane, the first trifunctional siloxane and the reinforcing agent in turn to obtain a sol system;

[0036] mixing the sol system and the gel catalyst to obtain a hydrogel;

[0037] drying the hydrogel at atmospheric pressure to obtain the aerogel;

[0038] The reinforcing agent includes one or more of the second trifunctional siloxane, the first difunctional siloxane and the first monofunctional siloxane.

[0039] In the present invention, unless otherwise specified, all preparation raw materials are commercially available products well known to those skilled in the art.

[0040] In the present invention, the acidic aqueous solution of the surfactant is subjected to hydrolysis condensation reaction with the tetrafunctional siloxane, the first trifuncti...

Embodiment 1

[0084] Mix 8g of cetyltrimethylamine bromide and 1000mL of deionized water, heat to 60°C to dissolve, then cool to room temperature, add nitric acid to adjust the pH to 2, and obtain an acidic aqueous solution of surfactant;

[0085] 45mL of tetraethyl orthosilicate was added to the acidic aqueous solution of surfactant, stirred at a stirring speed of 300rpm for 60min, and carried out a first-level hydrolysis condensation reaction; then added 145mL of methyltriethoxysilane, and stirred at a stirring speed of 300 45min, carry out secondary hydrolysis condensation reaction; then add 70mL dimethyldiethoxysilane, stir at 300rpm stirring speed for 30min, carry out hydrolysis condensation reaction; then add 40mL aminopropyltrimethoxysilane, stir at 300rpm speed, stir for 30min, carry out hydrolysis condensation reaction, obtain sol system;

[0086] Mix the sol system with ammonia water, adjust the pH value to 7, stir at a stirring speed of 800 rpm for 20 min, and let stand to form a...

Embodiment 2

[0089] Mix 20 g of polyoxyethylene ether and 1000 mL of deionized water and heat to 60° C. to dissolve, then cool to room temperature and add glacial acetic acid to adjust the pH to 4 to obtain an acidic aqueous solution of surfactant;

[0090] Add 30 mL of ethyl orthosilicate to the acidic aqueous solution of surfactant, and stir for 60 min at a stirring speed of 300 rpm to carry out a first-level hydrolysis condensation reaction; then add 180 mL of methyltrimethoxysilane, and stir for 30 min at a stirring speed of 300 rpm. , carry out secondary hydrolysis condensation reaction; then add 60mL dimethyldiethoxysilane, stir 50min at 300rpm stirring speed, carry out hydrolysis condensation reaction; then add 30mL acryloyloxypropyltrimethoxysilane, stir at 300rpm Stirring speed, stirring for 30min, carry out hydrolysis condensation reaction, obtain sol system;

[0091] Mix the sol system with the quaternary ammonium base, adjust the pH value to 8, stir at a stirring speed of 800 r...

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Abstract

The invention belongs to the technical field of aerogel, and particularly relates to a preparation method of aerogel. The invention provides an aerogel preparation method, which comprises: sequentially carrying out a hydrolytic condensation reaction on a surfactant acidic aqueous solution, tetrafunctional siloxane, first trifunctional siloxane and a reinforcing agent to obtain a sol system; mixing the sol system with a gel catalyst to obtain hydrogel; and carrying out normal pressure drying on the hydrogel to obtain the aerogel, and the reinforcing agent comprises one or more of second trifunctional siloxane, first bifunctional siloxane and first monofunctional siloxane. According to the preparation method provided by the invention, the aerogel can be dried under normal pressure, the process is simple, and a large number of organic solvents are not needed.

Description

technical field [0001] The invention belongs to the technical field of aerogels, and in particular relates to a preparation method of aerogels. Background technique [0002] Aerogel is a kind of porous material with typical bicontinuous nanostructure, which has the advantages of low density, high porosity, high specific surface area, low thermal conductivity, low refractive index and high acoustic impedance, and has wide application prospects. In the traditional process, the aerogel is mainly prepared by supercritical drying or normal pressure drying process to remove the solvent inside the wet gel and keep the network structure of the wet gel intact. [0003] For supercritical drying, expensive equipment investment is required, and at the same time, sufficient solvent exchange for wet gel is required; in addition, supercritical equipment usually operates under high temperature and high pressure, which has potential safety hazards. [0004] Atmospheric pressure drying does ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/152
CPCC01B33/1585C01B33/152
Inventor 彭少杰程青云彭笑雪
Owner 纳诚(邢台)新材料科技有限公司
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