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Preparation method of hydrophobic silica aerogel composite fiber felt material

A composite fiber mat and silica technology are applied in the fields of environment-friendly ceramic fiber mat, glass fiber mat reinforced silica aerogel composite material preparation, and hydrophobic silica aerogel composite fiber mat material preparation field, It can solve the problems of high brittleness, difficult industrial application and low aerogel strength, and achieve the effects of low density, mild modification conditions and low thermal conductivity.

Inactive Publication Date: 2018-09-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the prepared airgel materials have low strength and high brittleness, making it difficult to be directly applied in industry

Method used

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  • Preparation method of hydrophobic silica aerogel composite fiber felt material
  • Preparation method of hydrophobic silica aerogel composite fiber felt material
  • Preparation method of hydrophobic silica aerogel composite fiber felt material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 of the present invention The preparation method of hydrophobic silica airgel composite fiber felt comprises the following steps:

[0038] (1) Add tetraethyl orthosilicate, absolute ethanol and deionized water into the container, and mix and stir for 5 minutes according to molar ratio, tetraethyl orthosilicate: absolute ethanol: deionized water at 1:7:3; Add 1 mol / L hydrochloric acid, adjust the pH to 2-3, stir and hydrolyze for 1.5 hours to obtain silica sol;

[0039] (2) Add 0.446mol / L ammonia water to the above-mentioned silica sol, slowly add drop by drop and stir while adding, adjust the pH to about 7, then quickly pour it into ceramic and glass fiber mat prefabricated parts , and ensure that the surface is free of air bubbles and smooth until it is just submerged in the fiber mat, let it stand, and wait for the sol to gel in the fiber mat;

[0040] (3) Put the gelled composite material in a plastic or glass container, add tetraethyl orthosilicate: anh...

Embodiment 2

[0052] Embodiment 2 of the present invention The preparation method of the hydrophobic silica airgel composite fiber mat comprises the following steps:

[0053] (1) Add tetraethyl orthosilicate, absolute ethanol and deionized water into the container, and mix and stir for 10 min according to molar ratio, tetraethyl orthosilicate: absolute ethanol: deionized water at 1:5:1; Add 1 mol / L hydrochloric acid, adjust the pH to 2-3, stir and hydrolyze for 12 hours to obtain silica sol;

[0054] (2) Add 0.5mol / L ammonia water to the above-mentioned silica sol, slowly add dropwise and stir while adding, adjust the pH to about 7, then quickly pour it into the prefabricated parts of ceramic and glass fiber mat , and ensure that the surface is free of air bubbles and smooth until it is just submerged in the fiber mat, let it stand, and wait for the sol to gel in the fiber mat;

[0055] (3) Put the gelled composite material in a plastic or glass container, add tetraethyl orthosilicate: anh...

Embodiment 3

[0061] Embodiment 3 of the present invention The preparation method of hydrophobic silica airgel composite fiber mat comprises the following steps:

[0062] (1) Add tetraethyl orthosilicate, absolute ethanol and deionized water into the container, and mix and stir for 20 minutes according to the molar ratio of tetraethyl orthosilicate: absolute ethanol: deionized water at 1:7:3; Add 1 mol / L hydrochloric acid, adjust the pH to 2-3, stir and hydrolyze for 6 hours to obtain silica sol;

[0063] (2) Add 0.446mol / L ammonia water to the above-mentioned silica sol, slowly add it dropwise and stir while adding it, adjust the pH to about 7, then quickly introduce it into the ceramic and glass fiber mat prefabricated parts, And ensure that the surface is free of air bubbles and flat, until it just submerges the fiber mat, let it stand, and wait for the sol to gel in the fiber mat;

[0064] (3) Put the gelled composite material in a plastic or glass container, add tetraethyl orthosilica...

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Abstract

The invention relates to a preparation method of a hydrophobic silica aerogel composite fiber felt material. The preparation method comprises the following steps: mixing tetraethyl orthosilicate, ethanol, water and an acid catalyst to obtain silica sol; adding an alkali catalyst to the silica sol, uniformly stirring, pouring the mixture into a fiber felt (ceramic or glass fiber felt), immersing, and standing, so as to obtain a gel composite material; ageing the gel composite material in the fiber felt in mother liquor for a certain period of time, and then carrying out solvent exchange, so asto obtain a composite material; immersing the composite material in a solution containing certain concentration of a surface modifier for standing modification, and then drying the composite materialunder atmospheric pressure to obtain the hydrophobic silica aerogel composite fiber felt material. The preparation method has the advantages of simple process, short production cycle, lower cost, lowequipment requirement and excellent product performance, and the hydrophobic silica aerogel composite fiber felt material has superhydrophobic property, strong adsorption property and low thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of silica airgel composite heat insulation materials, in particular to a method for preparing a hydrophobic silica airgel composite fiber mat material, in particular to environment-friendly ceramic fiber mat and glass fiber mat reinforced carbon dioxide Preparation method of silica airgel composite material. Background technique [0002] Silica airgel is a nanoporous material with a three-dimensional network structure, known as "blue smoke", and more than 96% of its composition is gas, which is currently the lightest solid in the world. This special structure makes it have high porosity (85-95%, up to 99.8%), small pore size (1-100nm), high specific surface area (1000m 2 / g), low density (0.03-0.2g / cm 3 ), small refractive index (1.01-11), low sound velocity (100m / s), ultra-low thermal conductivity 0.015W / (m·K) and other properties. Because of its unique properties, it has broad application prospects in t...

Claims

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Application Information

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IPC IPC(8): C04B38/08C04B30/02
CPCC04B30/02C04B2111/40C04B2201/20C04B2201/32C04B14/064C04B14/42C04B38/0074C04B38/0067C04B38/0054C04B14/46
Inventor 王建国包志康宋鑫
Owner ZHEJIANG UNIV OF TECH
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