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Preparation method of fiber-reinforced flexible silica aerogel

A silica and fiber reinforced technology, used in ceramic products, applications, household appliances, etc., can solve the problems of aerogel application range, poor strength and elasticity of silica aerogel, easy wear and tear, etc. Achieve the effect of improving flexibility, easy process and simple manufacturing process

Active Publication Date: 2020-04-17
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor strength and elasticity of traditional silica airgel, it is easy to wear and tear, which greatly limits the application range of airgel.

Method used

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  • Preparation method of fiber-reinforced flexible silica aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of fiber-reinforced flexible silica airgel, the steps are as follows:

[0027] (1) Design the carbon fiber into a comb shape (such as figure 1 shown), the distance between two adjacent comb teeth is 0.3 cm;

[0028] (2) Mix the composite silicon source, absolute ethanol and water evenly, and then add NH in sequence 4 F solution and ammonia are stirred evenly to obtain silica sol; the composite silicon source is a composite silicon source composed of methyltrimethoxysilane and dimethyldimethoxysilane in a molar ratio of 1:1; in molar ratio, the composite silicon Source: absolute ethanol: water = 1:12:4; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: Composite silicon source = 0.003: 1; 3 : composite silicon source=0.015:1;

[0029] (3) Immerse the carbon fiber in the silica sol, let it stand after the impregnation is completed, and obtain the silica gel;

[0030] (4) Aging the silica gel obtained in step (3) at 60 °C ...

Embodiment 2

[0034] A preparation method of fiber-reinforced flexible silica airgel, the steps are as follows:

[0035] (1), design the glass fiber into a comb shape (such as figure 1 shown), the distance between two adjacent comb teeth is 0.5 cm;

[0036] (2) Mix the composite silicon source, absolute ethanol and water evenly, and then add NH in sequence 4 F solution and ammonia are stirred evenly to obtain silica sol; the composite silicon source is a composite silicon source composed of methyltriethoxysilane and hydroxyl silicone oil in a molar ratio of 1:2, and the molar weight of hydroxyl silicone oil is represented by repeating unit (CH 3 ) 2 SiO 2 To measure the molar weight of hydroxy silicone oil = the quality of hydroxy silicone oil / (CH 3 ) 2 SiO 2 molecular weight; in molar ratio, composite silicon source: absolute ethanol: water = 1:10:3; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: Composite silicon source = 0.008: 1; 3 : composite silic...

Embodiment 3

[0042] A preparation method of fiber-reinforced flexible silica airgel, the steps are as follows:

[0043] (1), design the ramie fiber into a comb shape (such as figure 1 shown), the distance between two adjacent comb teeth is 0.8 cm;

[0044] (2) Mix the composite silicon source, absolute ethanol and water evenly, and then add NH in sequence 4F solution and ammonia are stirred evenly to obtain silica sol; the composite silicon source is a composite silicon source composed of ethyltrimethoxysilane and dimethyldiethoxysilane in a molar ratio of 1:3; in molar ratio, the composite silicon Source: absolute ethanol: water = 1:8:2; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: Composite silicon source = 0.002:1; the amount of ammonia added is guaranteed in molar ratio, NH 3 :Composite silicon source=0.006:1.

[0045] (3), impregnating the ramie fiber in the silica sol, and standing still after the impregnation is completed, to obtain the silica gel; ...

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Abstract

The invention belongs to the technical field of aerogel preparation, and discloses a preparation method of a fiber-reinforced flexible silica aerogel. The preparation method comprises the following steps: designing fibers into a comb tooth shape; taking and uniformly mixing a silicon source, ethanol and water, sequentially adding an NH4F solution and ammonia water, and uniformly stirring to obtaina silica sol, wherein the silicon source is a composite silicon source composed of a silicon source A and a silicon source B, the silicon source A is at least one of alkyl trialkoxysilanes, and the silicon source B is at least one of dialkyldialkoxysilane and hydroxyl silicone oil; soaking the fibers into the silica sol, and standing and aging after soaking to obtain a silica gel; and carrying out solvent replacement on the silica gel, and drying to obtain the product. The aerogel prepared in the invention has good hydrophobic property and greatly improved deformability and flexibility.

Description

technical field [0001] The invention belongs to the technical field of airgel preparation, and in particular relates to a preparation method of fiber-reinforced flexible silica airgel. Background technique [0002] Airgel is a kind of gel material whose dispersion medium is gas, and the interior is a highly cross-linked continuous three-dimensional network nano-hollow structure with a large specific surface area (500-1300 m 2 / g), low density (30~150 g / m 3 ), high porosity (85%~99%), small average pore size (2~50 m), and lower thermal conductivity (0.01-0.02 / m ▪K) than air at room temperature, etc., are currently recognized thermal conductivity The lowest solid material; it has broad application prospects in aerospace, petrochemical, electric power metallurgy, ship vehicles, precision instruments, refrigerator cold storage, clothing tents, building energy conservation, etc. It is a revolutionary substitute for traditional heat insulation materials. [0003] The existing p...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/00C04B111/27
CPCC04B30/02C04B2111/27C04B2201/32C04B2201/50C04B14/064C04B14/386C04B38/0045C04B14/42C04B18/248
Inventor 姚栋嘉董会娜袁利娟刘喜宗杨超牛利伟张东生张继承
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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