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Preparation method of silicon dioxide aerogel composite material

A technology of silica and composite materials, applied in ceramic products, applications, household appliances, etc., can solve problems such as complex preparation process, and achieve the effect of simple preparation process, low equipment cost, and good heat insulation performance

Active Publication Date: 2014-03-19
厦门纳美特新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent CN1636917A, the inventor prepared a calcium silicate composite nanoporous super-insulation material, which uses ultra-fine diameter xonotlite fibers to form hollow secondary particles as a hard supporting framework and SiO 2 The airgel forms a composite material, and the sol is poured into the porous xoolite structure through an infiltration process, and the SiO obtained by this process 2 Airgel thermal insulation composite materials have good thermal insulation properties and mechanical properties, but the preparation process of this method is relatively complicated and requires special equipment

Method used

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  • Preparation method of silicon dioxide aerogel composite material
  • Preparation method of silicon dioxide aerogel composite material
  • Preparation method of silicon dioxide aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, take 0.1 g of glass fiber and immerse it in 1 mol / L hydrochloric acid solution, stir it slowly for 1 hour, take it out and rinse it with water, heat treat it at 110°C for 2 hours, and cool it at room temperature for use. Take 10ml, 20ml, 6ml, and 1ml of TEOS, EtOH, water, and hydrochloric acid-alcohol solution, add them into a plastic container, mix and stir, then add glass fiber, and slowly add about 4.5ml of ammonia-water-alcohol solution dropwise after 10 hours to adjust the pH at Around 8.0, after stirring for another 10-15 minutes, pour the sol into the mold, seal it and let it stand until it gels. Take the composite wet gel and age it at 60°C for 2 days in absolute ethanol. After aging, soak the wet gel in a mixed modifier solution of 8ml TMCS, 10ml absolute ethanol, and 50ml n-hexane, and modify it at 35°C. After 2 days of resistance, the composite wet gel was taken out and cleaned, and often pressed and dried to obtain a glass fiber reinforced silica comp...

Embodiment 2

[0040] First, soak 0.15g of glass wool in 2mol / L hydrochloric acid solution, stir slowly for 0.5 hours, take it out and rinse with water, add 10 -3 ml KH-550 coupling agent and 10ml absolute ethanol mixed solution, stirred slowly for 3 hours, heat treated at 110°C for 3 hours, then took it out for use. Take 10ml, 25ml, 6ml, and 1.2ml of TEOS, EtOH, water, and hydrochloric acid-alcoholic solutions and mix them, then add treated glass wool, and disperse evenly. . Then the composite wet gel was aged in absolute ethanol at 50°C for 2 days, after aging, the wet gel was immersed in a mixed modifier solution containing 10ml TMCS, 10ml absolute ethanol, and 50ml n-hexane, and changed at room temperature. After 2 days of resistance, the wet gel was taken out, washed with n-hexane, and dried under constant pressure to obtain a glass wool-reinforced silica composite airgel. The drying process is the same as in Example 1.

[0041] The prepared silica composite airgel has a porosity of ...

Embodiment 3

[0043] First, take 0.15 g of glass fiber and soak it in 2 mol / L hydrochloric acid solution, stir slowly for 2 hours, take it out and rinse it with water, heat treat it at 110°C for 2 hours, and cool it at room temperature for use. Take 8ml, 20ml, 5ml, and 1.2ml of TEOS, EtOH, water, and hydrochloric acid-alcoholic solution, add them into a plastic container, mix and stir, add glass fiber after 6 hours, and slowly add ammonia-water-alcohol solution dropwise after 6 hours to adjust the pH to around 8.0 , Pour the sol into the mold, seal it and let it stand until it gels. Take the composite wet gel and age it at 50°C for 2 days in absolute ethanol. After aging, soak the wet gel in a mixed modifier solution of 7ml TMCS, 10ml absolute ethanol, and 40ml n-hexane, and modify it at 35°C. After 2 days of resistance, the composite wet gel was taken out and cleaned, and often pressed and dried to obtain a glass fiber reinforced silica composite airgel. The drying process is the same as ...

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Abstract

The invention relates to preparation and a method of a silicon dioxide aerogel composite material. The silicon dioxide aerogel composite material takes tetraethyl orthosilicate as a silicon source and industrially-produced glass fibers or fiber cotton materials as a reinforcing body. Firstly, composite wet gel is prepared by adopting a fiber surface acid treatment process or an acid treatment and coupling agent crosslinking common treatment process and a sol-gel method, then, the composite wet gel is aged, solvent-replaced and modified, and finally, the silicon dioxide aerogel composite material is prepared under the normal-pressure drying. The prepared silicon dioxide aerogel composite material has the characteristics of high porosity, high specific surface area, low density, low dielectric constant, low thermal conductivity and the like and also has good formability, and functional materials with different properties and structures can be prepared as required. The preparation and the method have the advantages of simple synthesis process, low raw material cost and low equipment requirements; and the prepared composite aerogel has a certain mechanical property, is enlarged in the application field and can be taken as building heat-insulation and sound-insulation materials, transportation pipeline energy conservation and environmental protection material and fire protection and heat insulation materials.

Description

technical field [0001] The present invention relates to the preparation and method of a silica airgel composite material, in particular to a fiber surface acid treatment process or acid treatment and coupling agent cross-linking joint treatment process and sol-gel method combined in the usual A method for preparing a silica airgel composite material under pressure drying. Background technique [0002] Silica airgel is a nanoporous amorphous lightweight material with controllable skeleton structure and pores. The skeleton structure of the material is formed by the chain accumulation of silica nano-scale particles, contains a large amount of air, and has a high specific surface area (800-1500m 2 / g), high porosity (80-99.8%), low density (0.03-0.3g / cm 3 ), low refractive index (1~1.1), low thermal conductivity (~0.01W·m -1 ·K -1 ), low dielectric constant (1.0-2.0) and other superior properties, it has broad application prospects in the fields of heat insulation, catalytic...

Claims

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Application Information

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IPC IPC(8): C04B30/02
CPCC04B35/82C04B35/14C04B35/624C04B35/62849C04B38/00C04B38/0045C04B2111/00836C04B2111/00853C04B2111/52C04B2235/441C04B2235/606C04B2235/96C04B2235/9607C04B38/0054C04B38/0074
Inventor 林华坚
Owner 厦门纳美特新材料科技有限公司
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