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A kind of foam silica ceramic airgel material and preparation method thereof

A silica and aerogel technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of a large number of non-polar solvents, high solvent costs, easy damage to the pore structure, etc., and achieve drying equipment and operation. Low cost, high cost effect

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil phase solvent volatilizes during the drying process and easily destroys the pore structure. It is necessary to use a freeze-drying process to ensure the stability of the porous structure, and the cost of the solvent is high. It will pollute the environment during the removal process and is not suitable for large-scale industrial use. application
The third is to use perking emulsion stabilization technology, using nanoparticles as the oil-water interface stabilizer, and controlling the product shape by controlling the content of nanoparticles, for example, using silica nanoparticles as a stabilizer, TEOS as a silicon source, and tetradecane as an oil The phase forms a foam-like structure; but this method still requires a large amount of non-polar solvent, and the cost of nanoparticles as a stabilizer is relatively high, making it more difficult to meet the requirements of industrial production

Method used

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  • A kind of foam silica ceramic airgel material and preparation method thereof
  • A kind of foam silica ceramic airgel material and preparation method thereof
  • A kind of foam silica ceramic airgel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Weigh 3g of surfactant and 12g of water and stir to dissolve for 20 minutes at 25°C to obtain a uniform surfactant solution;

[0074] (2) add the 20-fold diluted ammonia water to adjust the pH of the surfactant solution to 6.35, and stir for 20 minutes to stabilize the pH value; in the surfactant solution, add 6g of TEOS (tetraethoxysilane), stir at 15000rpm for 5 minutes ( High-speed homogenization treatment), then stir at 1000rpm for 50 minutes (low-speed stirring treatment), and let stand at 25°C for two days;

[0075] (3) The solid produced after standing is taken out, soaked and washed with water, and then placed in an oven at 80° C. to dry for 24 hours to obtain aerogel.

[0076] (4) Burning the obtained aerogel at 500° C. for 2 hours to obtain the foamed silica ceramic aerogel material. The microscopic morphology of the side is as figure 1 . from figure 1 It can be seen that the foam material has a complete foam structure, the size of the foam is about 1 ...

Embodiment 2

[0078] (1) Weigh 3g of surfactant and 9g of water and stir to dissolve for 20 minutes at 25°C to obtain a uniform surfactant solution (surfactant solution);

[0079] (2) add the 20-fold diluted ammonia water to adjust the pH of the surfactant solution to 6.35, and stir for 20 minutes to stabilize the pH value; add 6g of TEOS (tetraethoxysilane) in the surfactant solution, stir at 1000rpm for 50 minutes ( Low-speed stirring treatment), let stand at 25°C for two days;

[0080] (3) Take out the solid produced after standing, soak and wash with a small amount of water, and then place it in an oven at 80° C. to dry for 24 hours to obtain aerogel.

[0081] (4) Burning the obtained aerogel at 500° C. for 2 hours to obtain the foamed silica ceramic aerogel material. The microscopic morphology of the side is as figure 2 . from figure 2 It can be seen that due to the lack of high-speed homogenization treatment in step (2), the pore size becomes larger, and then the density increas...

Embodiment 3

[0083] (1) Weigh 3g of surfactant and 30g of water and stir to dissolve for 20 minutes at 25°C to obtain a uniform surfactant solution (surfactant solution);

[0084] (2) add the 20-fold diluted ammonia water to adjust the pH of the surfactant solution to 6.35, and stir for 20 minutes to stabilize the pH value; in the surfactant solution, add 6g of TEOS (tetraethoxysilane), stir at 15000rpm for 5 minutes ( High-speed homogenization treatment), then stir at 1000rpm for 50 minutes (low-speed stirring treatment), and let stand at 25°C for two days;

[0085] (3) taking out the solid produced after standing, soaking and cleaning with a small amount of water, and then placing it in an oven at 80 ° C and drying for 24 hours to obtain aerogel;

[0086] (4) Burning the obtained aerogel at 500° C. for 2 hours to obtain the foamed silica ceramic aerogel material. Due to the change in the ratio of silicon source and water, its density has changed, as shown in Table 1.

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Abstract

The invention discloses a foamed silicon dioxide ceramic airgel material and a preparation method thereof. The preparation method comprises: dissolving the surfactant in water; adjusting the pH value of the surfactant solution; adding tetraethoxysilane and stirring; standing the gel to form a block; heating the block gel to dry and burning, Obtain block foam silica ceramic airgel material. The invention utilizes the structure-guiding effect of the surfactant to react tetraethoxysilane in the water system to form massive silica gel, and then heats, dries, and burns to synthesize a silica gel with high mechanical strength, low thermal conductivity and Low density foamed silica ceramic airgel. Compared with the mainstream thermal insulation materials such as rock wool and glass wool in the market, the foamed silica ceramic airgel material has lower thermal conductivity and density.

Description

technical field [0001] The invention belongs to the field of porous silica preparation, in particular to a foamed silica ceramic aerogel material and a preparation method thereof. Background technique [0002] Due to its unique connected or closed cell structure, ultra-low density, high specific surface area, low thermal conductivity and other properties, porous foamed silica materials are widely used in aerospace thermal insulation, building energy conservation and thermal insulation, gas adsorption and filtration materials, catalyst carrier materials, Many fields such as drug carrier materials have received extensive attention. [0003] Porous foamed silica materials are generally prepared in three ways. One is to use a foaming agent to generate gas to build a pore structure during the reaction process. For example, urea is decomposed at a certain temperature to generate ammonia and carbon dioxide, and the gas stays in the material to form pores; The main problems of this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/14C04B35/632
CPCC04B38/0045C04B35/14C04B35/632
Inventor 司徒粤黄晨光黄洪任振雪王宪伟
Owner SOUTH CHINA UNIV OF TECH
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