Method for preparing foam material reinforced silica aerogel composite material

A technology of silica and foam materials, which is applied in the field of preparing silica aerogel composite materials, can solve the problem that polymer materials are rarely used as reinforcements, etc., and achieves high operability, good formability and strong adsorption Effect

Active Publication Date: 2012-02-15
ZHONGKE RUNZI (CHONGQING) ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few research reports on the use of polymer materials as reinforcements.

Method used

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  • Method for preparing foam material reinforced silica aerogel composite material
  • Method for preparing foam material reinforced silica aerogel composite material
  • Method for preparing foam material reinforced silica aerogel composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 10ml of tetraethyl orthosilicate, 25ml of absolute ethanol, 5ml of methyltriethoxysilane, and 6ml of distilled water into the container and stir to mix. After 15 minutes, slowly add 1ml of hydrochloric acid alcohol solution and continue to mix and stir . After 16 hours, slowly add 5ml of ammonia-water-alcohol solution dropwise, stop stirring after 5 minutes, pour the gel into a mold of a suitable size with polyurethane foam, seal it and let it stand until it gels. After the gel was aged in ethanol at 50°C for 2 days, the composite gel was immersed in a mixed solution containing 8mlTMCS and 50ml n-hexane, and modified at room temperature for 2 days; the composite wet gel was aged in n-hexane solution for 1 day, and finally often press and dry to obtain polyurethane foam reinforced silica composite airgel. The drying process is as follows: the sample is kept at 55°C for 3 hours, at 80°C for 5 hours, and then at 130°C for 3 hours. The heating rate of the drying proces...

Embodiment 2

[0032] Take 10ml, 25ml, 4ml, and 7.5ml of tetraethyl orthosilicate: absolute ethanol: methyltriethoxysilane: water in a molar ratio of 1:12:0.4:8, mix them, and slowly mix 1ml of hydrochloric acid alcohol solution Add it into the solution, adjust the pH of the solution to between 2 and 3, stir and hydrolyze for 12 hours, add ammonia water and alcohol solution to adjust the pH to about 8, stir to make the solution fully mixed, stop stirring after 5 minutes, pour the gel into a certain shape The phenolic resin foam material mold, seal and let stand, to be gel. Then aged in ethanol at 55°C for 2 days. Then soak the sample in a mixed solution of 8ml trimethylchlorosilane, 5ml absolute ethanol, and 50ml n-hexane to modify at room temperature for 2 days. Afterwards, it was aged with n-hexane for 1 day, and finally the sample was heated and dried under normal pressure to obtain a silica airgel composite material. The drying process was consistent with that of Example 1.

[0033] Th...

Embodiment 3

[0035] Add 10ml of tetraethyl orthosilicate, 25ml of absolute ethanol, and 6ml of distilled water into the container and stir to mix. After 15 minutes, slowly add hydrochloric acid alcohol solution to adjust the pH value between 2 and 3, and continue to mix and stir. After 12 hours, slowly add a certain amount of ammonia water alcohol solution drop by drop, adjust the pH value to about 8, stop stirring after 10 minutes, pour the gel into a polyurethane foam mold with a suitable size, seal it and let it stand until it gels. Then soak the sample in a mixed solution of 8ml trimethylchlorosilane, 5ml absolute ethanol, and 50ml n-hexane for modification at 35°C for 2 days. Afterwards, it was aged with n-hexane for 1 day, and finally the sample was heated and dried under normal pressure to obtain a silica airgel composite material. The drying process was the same as in Example 1. The prepared silica composite airgel has a density of 0.3-0.4 g / cm 3 , the porosity is 83-90%, and the ...

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Abstract

The invention discloses a method for preparing a foam material reinforced silica aerogel composite material and relates to silica aerogel. The method comprises the following steps of: preparing silica plural gel and aging the silica plural gel, modifying and drying. Through test, porosity is 80 t o 95 percent, density is 0.15 to 0.5g / cm<3>, the Brunauer-Emmett-Teller (BET) specific surface area is 600 to 1,100m<2> / g, and a water contact angle is 130 to 160 degrees; the foam material reinforced silica aerogel composite material is super hydrophobic; aerogel pore size distribution is relativelycentralized and the pore size of the aerogel is 2 to 50nm; and coefficient of heat conductivity is 0.01 to 0.035 W / (m.K), compression strength is 0.3 to 2Mpa (2 percent deformation), and elastic modulus is 1 to 5 Mpa. Meanwhile, the foam material reinforced silica aerogel composite material has good heat insulation performance, and adsorption performance, environment-friendliness and the other excellent performance. The method is simple, is short in a cycle, low in cost, and high in safety, and contributes to large-scale production; and by the method, excellent performance of the aerogel can be kept and the mechanical property of aerogel can be improved.

Description

technical field [0001] The invention relates to a silica airgel, in particular to a method for preparing a silica airgel composite material based on a sol-gel technology and using a foam material as a reinforcing body under normal pressure drying. Background technique [0002] Silica airgel is a new type of nanoporous amorphous functional material with a spatial network structure in which the solid phase particles and pore sizes are on the nanometer scale. The network structure and pore size can be controlled and tailored at the nanoscale. Silica airgel has many unique superior properties, such as high specific surface area (500~1500m 2 / g), high porosity (80%~99.8%), high thermal insulation (~0.01W / (m K)), low density (0.03~0.3g / cm 3 ), low dielectric constant (1.0-2.0) and low refractive index (1-1.1), etc., and the performance can be continuously adjusted with the control of the airgel structure. , petrochemical, drug release, building energy saving, aerospace and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/24C04B16/08
Inventor 程璇吴国友邵再东罗凤钻韩蒙余煜玺张颖
Owner ZHONGKE RUNZI (CHONGQING) ENERGY SAVING TECH CO LTD
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