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Process for preparation of nano multiporous silicon dioxide aerogel block

A silicon dioxide and nanoporous technology, applied in the direction of silicon dioxide, silicon oxide, ceramic products, etc., can solve the problems of low thermal insulation performance, incapable of mass production, unreachable and other problems, and achieve excellent thermal insulation effect

Inactive Publication Date: 2004-12-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when used as thermal insulation materials, it usually needs to have excellent thermal insulation performance, sound structure, and low price, while traditional asbestos materials contain carcinogens, and calcium silicate materials cannot achieve low thermal insulation performance. Organic foams The material is not resistant to high temperature and corrosion, and the cost of airgel prepared by supercritical is high and cannot be mass-produced due to the limitation of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Polysiloxane E-40 was mixed with water, ethanol, and hydrofluoric acid in a volume ratio of 1:8:0.5:0.05 at room temperature, and a wet gel was obtained after 3 hours. Submerge the wet gel in a surface modification solution (mixed solution of trimethylchlorosilane, n-hexane, and isopropanol, volume ratio at room temperature: 1:8:0.3), and soak at room temperature. After 30 hours, the wet gel was taken out, dried and crushed properly to obtain small hydrophobic airgel particles with an average particle diameter of Φ2~5mm. Mix the obtained silica airgel particles with calcium silicate slurry, rutile titanium dioxide, ceramic fiber, glass fiber, and porous cement in a mass ratio of 100:10:5:1:1:0.5, mix them vigorously, and press Then get the blocks. After drying at 105° C. for 20 hours, an integral hydrophobic silica airgel block (aerogel volume content > 90%) is obtained.

Embodiment 2

[0024] The volume ratio of E-40 to water, ethanol, and hydrofluoric acid at room temperature is 1:3:0.2:0.06; in the surface modification solution, the mixed solution of trimethylchlorosilane, n-hexane, and isopropanol, the volume ratio at room temperature is: 1 : 10: 0.3; the mass ratio of silica airgel particles to calcium silicate slurry, rutile titanium dioxide, ceramic fibers, glass fibers, and porous cement is 10: 10: 5: 1: 1: 0.5. The rest of the conditions are the same as in Example 1 to obtain an integral hydrophobic silica airgel block (the volume content of the airgel is more than 90%).

Embodiment 3

[0026] The volume ratio of E-40 to water, ethanol, and hydrofluoric acid at room temperature is 1:15:0.6:0.6; in the surface modification solution, the mixed solution of trimethylchlorosilane, n-hexane, and isopropanol, the volume ratio at room temperature is: 1 : 12: 0.5; the mass ratio of silica airgel particles to calcium silicate slurry, rutile titanium dioxide, ceramic fibers, glass fibers, and porous cement is 200: 50: 6: 1.2: 1.2: 0.6. The rest of the conditions are the same as in Example 1 to obtain an integral hydrophobic silica airgel block (the volume content of the airgel is more than 90%).

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Abstract

The process of producing silica aerogel block adopts the materials including polysiloxane E-40 as Si source, ethanol, water and hydrofluoric acid; and includes preparing silica aerogel grain via sol-gel and surface modification process at normal pressure, mixing the grain with calcium silicate slurry, rutile type titanium dioxide powder, ceramic fiber, glass fiber and porous cement via powerful stirring, and pressing into block with aerogel content greater than 90 vol%. High strength skeleton may be embedded into the block if necessary. The present invention may be used in insulation, sound isolation and adsorption.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing a nanoporous silica airgel block. Background technique [0002] SiO 2 Airgel is a kind of porous material with high specific surface area and low density. Due to the existence of nano-network structure, this material itself has special properties, and has broad application prospects in many fields such as optics, electricity, acoustics, environmental protection, and metallurgy. , was listed as the world's top ten popular science and technology by the 250th issue of "Science" in the United States. Inorganic SiO 2 Airgel has a very low solid thermal conductivity and a nanoporous structure that can prevent air convection heat conduction. It can reflect and absorb infrared radiation by doping, so that SiO 2 Airgel material has become a light-weight and high-efficiency thermal insulation material with extremely low thermal conductivity;...

Claims

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Application Information

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IPC IPC(8): C01B33/14C04B14/04C04B14/06C04B38/08
Inventor 周斌黄耀东沈军倪星元吴广明
Owner TONGJI UNIV
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