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Preparation method for glass fiber-reinforced water glass-based silica composite aerogel

A composite aerogel and silica technology, applied in the field of silica aerogel, can solve the problems of affecting the uniformity and strength of materials, waste of modifiers and other solutions, and time increase, and achieve physical properties and Effects of excellent mechanical properties, low solvent and modifier consumption, and increased pore size and pore volume

Inactive Publication Date: 2013-11-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation process, the silica sol after ion exchange is only compounded by the adsorption of glass wool, which greatly affects the uniformity and strength of the material, and requires multi-step modification, resulting in waste of modifiers and other solutions and preparation process. time growth

Method used

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  • Preparation method for glass fiber-reinforced water glass-based silica composite aerogel
  • Preparation method for glass fiber-reinforced water glass-based silica composite aerogel
  • Preparation method for glass fiber-reinforced water glass-based silica composite aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The molar ratio of raw materials is: water glass: MTES: water=1: 0.3: 35, the MTES of 1.7ml, the water glass solution of 5ml and the deionized water of 12.5ml are mixed and stirred for 48h, and then the mixed solution is passed into 25ml of strong acid In the styrene resin, after 10 minutes, the silica sol with pH=2.5 was obtained by suction filtration, and 0.15 g of glass fiber after heat treatment at 120°C for 24 hours was added to the above silica sol obtained by suction filtration, stirred for 1 hour, and a certain amount of ammonia water was added while stirring, so that The final pH value of the system was 8. After 10 minutes, the stirring was stopped, and the silica sol was left to stand for 24 hours until the sample gelled. Place the gel in absolute ethanol solution for aging and solvent replacement. The aging temperature is 50°C. After aging, the gel sample is immersed in the solution with a volume ratio of TMCS: absolute ethanol: n-hexane = 2:1:8. The modified...

Embodiment 2

[0039] The molar ratio of raw materials is: water glass: MTMS: water=1: 0.2: 38, the MTMS of 1.2ml, the water glass solution of 5ml and the deionized water of 13.5ml are mixed and stirred for 24h, and then the mixed solution is passed into 25ml of strong acid In the styrene resin, after 10 minutes, the silica sol with pH = 2 was obtained by suction filtration, and 0.2 g of glass fibers after heat treatment at 200 ° C for 24 hours were added to the above silica sol obtained by suction filtration, stirred for 1 hour, and a certain amount of ammonia water was added while stirring, so that The final pH value of the system was 8.1-8.2. After 10 minutes, the stirring was stopped, and the silica sol was left to stand for 24 hours until the sample gelled. Place the gel in absolute ethanol solution for aging and solvent replacement. The aging temperature is 30°C. After aging, the gel sample is immersed in the solution with a volume ratio of TMCS: absolute ethanol: n-hexane = 1:3:6. The...

Embodiment 3

[0043] The raw material molar ratio is: water glass: MTES: water=1: 0.2: 40, the MTES of 1.2ml, the water glass solution of 5ml and the deionized water of 14.3ml are mixed and stirred for 24h, and then the mixed solution is passed into 25ml of strongly acidic benzene In vinyl resin, after 10 minutes, the silica sol with pH = 2.5 was obtained by suction filtration, and 0.15 g of glass fibers after heat treatment at 120°C for 12 hours were added to the above silica sol obtained by suction filtration, stirred for 30 minutes, and a certain amount of ammonia water was added while stirring to make the system The final pH value is between 8.2 and 8.3. After 10 minutes, the stirring is stopped, and the silica sol is allowed to stand for 24 hours until the sample gels. Place the gel in absolute ethanol solution for aging and solvent replacement. The aging temperature is 30°C. After aging, the gel sample is immersed in the solution with a volume ratio of TMCS: absolute ethanol: n-hexane=...

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Abstract

The invention provides a preparation method for a glass fiber-reinforced water glass-based silica composite aerogel, which relates to a silica aerogel. The preparation method comprises the following steps: mixing methoxysilane with a water glass solution and water and allowing methoxysilane to be hydrolyzed in water to obtain solution A; then adding a strongly acidic styrene resin for ion exchange, carrying out pumping filtration to obtain a solution with a pH value of 2 to 3, adding a glass fiber having undergone heat treatment into the solution obtained after pumping filtration and adding ammonia water to adjust a pH value to 8 to 8.5 so as to obtain a fiber compounded silica sol; transferring the fiber compounded silica sol to a container for standing so as to obtain a composite silica hydrogel; and then immersing the composite silica hydrogel in an absolute ethyl alcohol solution for aging and alcoholization of the gel, immersing the wet gel obtained after alcoholization in a mixed solution of trimethylchlorosilane, absolute ethyl alcohol and hexane, carrying out surface modification and drying the modified gel so as to obtain the glass fiber-reinforced water glass-based silica composite aerogel. The preparation method provided by the invention has the advantages of low cost, simple process, a short production period, a controllable product shape and capacity of realizing continuous production.

Description

technical field [0001] The present invention relates to a kind of silica airgel, especially relates to a kind of using industrial water glass as raw material, adopts unique secondary modification method and through rapid solvent replacement, dry at normal pressure to prepare glass fiber reinforced water glass base dioxide Preparation method of silicon composite airgel. Background technique [0002] Silicon dioxide (SiO 2 ) Airgel is a solid phase particle, a new type of porous functional material whose pore size is on the nanometer scale, and the continuous three-dimensional network structure can be controlled and tailored at the nanometer scale. Silica airgel has many unique properties, such as high specific surface area, high porosity, high thermal insulation, low density, ultra-low dielectric constant and low refractive index, etc., and its properties can be improved with the control of its structure. Continuous adjustability. The excellent performance of silica airgel...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 程璇邵再东张霄翔
Owner XIAMEN UNIV
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