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

Method used

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  • Preparation method of fiber-reinforced flexible silica aerogel

Examples

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Example Embodiment

[0025] Example 1

[0026] A method for preparing fiber-reinforced flexible silica aerogel, the steps are as follows:

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

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

[0029] (3) The carbon fiber is immersed in the silica sol, and after the immersio...

Example Embodiment

[0033] Example 2

[0034] A method for preparing fiber-reinforced flexible silica aerogel, the steps are as follows:

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

[0036] (2) Take the composite silicon source, absolute ethanol and water and mix them evenly, then add NH in turn 4 F solution and ammonia water are stirred uniformly to obtain silica sol; the composite silicon source is a composite silicon source composed of methyltriethoxysilane and hydroxy silicone oil at a molar ratio of 1:2, and the molar amount of hydroxy silicone oil is based on the repeating unit (CH 3 ) 2 SiO 2 To measure the molar amount of hydroxy silicone oil = the mass of hydroxy silicone oil / (CH 3 ) 2 SiO 2 The molecular weight of; in molar ratio, composite silicon source: absolute ethanol: water=1:10:3; NH 4 The amount of F solution added must be calculated in molar ratio, NH 4 F: Composite silicon source=0.00...

Example Embodiment

[0041] Example 3

[0042] A method for preparing fiber-reinforced flexible silica aerogel, the steps are as follows:

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

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

[0045] (3) The ramie fiber is immersed in silica sol, and after the dipping is compl...

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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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