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Flexible silica aerogel material and preparation method thereof

A technology of silica airgel and silica sol, which is applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of low strength, falling powder particles, large brittleness, etc., to expand the scope of application, Effects of improved service life and good deformability

Inactive Publication Date: 2017-09-15
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, silica airgel materials still have the problems of high brittleness, low strength and easy cracking. In order to solve the above technical problems, scientists have developed silica airgel thermal insulation materials composited with inorganic fibers. This composite airgel material Combining the strength and toughness of inorganic fibers with the lightweight and efficient thermal insulation properties of silica airgel, it also has the advantages of being bendable, tailorable, easy to shape and easy to process.
However, it still has the problem of brittleness, and it has the problem of powder and particle falling off after being subjected to force and impact, which affects its service life and heat insulation performance.

Method used

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  • Flexible silica aerogel material and preparation method thereof
  • Flexible silica aerogel material and preparation method thereof
  • Flexible silica aerogel material and preparation method thereof

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preparation example Construction

[0036] The embodiment of the present invention provides a method for preparing a flexible silica airgel material, comprising the following steps:

[0037] 1) Freezing the acidic silica sol to obtain frozen silica sol;

[0038] The purpose of freezing the acidic silica sol is to reduce the rate of the subsequent reaction of the silica sol with the amino group-containing silane coupling agent, so as to reasonably modify the surface of the silica sol with amino groups;

[0039] In the embodiment of the present invention, by sealing the acidic silica sol, at -10 - Place it at -20°C for 60-80 minutes to obtain frozen silica sol.

[0040] If the freezing temperature is lower than -20°C, it is possible to prolong the subsequent gelation time. If the temperature is higher than -10°C, the polycondensation rate of the subsequent silica sol cannot be well controlled. Under the temperature and time conditions of the present invention, silica The gelation time of the sol is about 5-8 min...

Embodiment 1

[0061] First, pour tetraethyl orthosilicate, deionized water, hydrochloric acid and ethanol into a beaker, and stir in water at a temperature of 50°C for 30 minutes to obtain an acidic silica sol. Among them, tetraethyl orthosilicate, deionized water, hydrochloric acid , The molar ratio of ethanol is: 1:2:0.001:15;

[0062] Then, seal the silica sol, put it in the refrigerator, adjust the temperature to -20°C, and store it for 60 minutes to obtain frozen silica sol;

[0063] Add aminopropyltriethoxysilane to the above frozen silica sol, the molar ratio of aminopropyltriethoxysilane to tetraethyl orthosilicate is 0.1:1, stir at room temperature for 3 minutes, then pour into the mold In the process, after the mold was sealed, it was aged at room temperature for 2 days to form a surface amino-modified silica wet gel;

[0064] Slowly pour out the wet gel from the abrasive tool, soak it into the tetrahydrofuran solution containing bisphenol A diglycidyl ether, wherein the molar am...

Embodiment 2

[0069] First, pour ethyl orthosilicate, deionized water, hydrochloric acid, and ethanol into a beaker, and stir in water at a temperature of 50°C for 20 minutes to obtain an acidic silica sol. Among them, ethyl orthosilicate, deionized water, hydrochloric acid, and ethanol The molar ratio is: 1:3:0.001:20; then seal the silica sol, put it in the refrigerator, adjust the temperature to -20°C, and store it for 60 minutes to obtain frozen silica sol;

[0070] Add aminopropyltriethoxysilane to the above frozen silica sol, the molar ratio of aminopropyltriethoxysilane to ethyl orthosilicate is 0.2:1, stir at room temperature for 5 minutes, then pour into the mold In the process, after the mold was sealed, it was aged at room temperature for 3 days to form a surface amino-modified silica wet gel;

[0071] Slowly pour out the wet gel from the abrasive tool, soak it into the tetrahydrofuran solution containing bisphenol A diglycidyl ether, wherein the molar amount of bisphenol A digly...

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Abstract

The invention relates to a flexible silica aerogel material and a preparation method thereof and belongs to the technical field of preparation of nanometer materials. The preparation method of the flexible silica aerogel material provided by the invention comprises the following steps: adding an amino-containing silane coupling agent in frozen acidic silica sol, and controlling the amino-containing silane coupling agent to react with the silica sol so that active amido is introduced onto the surface of the wet silica gel; soaking the modified wet silica gel into a solution containing organic epoxy molecules, introducing a flexible organic molecule layer into the surface of the wet silica gel through an addition reaction between the amino on the surface of the wet silica gel and the epoxy organic molecules; and finally, purifying and drying, thus obtaining the dried flexible silica aerogel material.

Description

technical field [0001] The invention relates to a flexible silica airgel material and a preparation method thereof, belonging to the technical field of nanomaterial preparation. Background technique [0002] Silica airgel material is a nanoporous solid material with low density (0.003-0.2g / cm3), low thermal conductivity (0.012-0.025W / (m K)), low dielectric coefficient, flame retardant, With the characteristics of high specific surface area and high porosity, it is the material with the best heat insulation performance known so far. The US journal Science has rated airgel materials as one of the top ten scientific and technological advances of the year for three consecutive years. [0003] Airgel materials have important applications in thermal insulation in aerospace. For example, NASA uses silica aerogel materials as heat insulation components on the Mars rover in Mars exploration, uses aerogels as thermal protection components in the atmospheric reentry deceleration devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 崔方明
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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