Preparation method of SiOC ceramic aerogel

An aerogel and ceramic technology, applied in the field of preparation of SiOC ceramic aerogel, can solve the problem of difficult control of the pore size of SiOC ceramic aerogel, and achieve stable temperature resistance and oxidation resistance, high specific surface area, and stable structure. Effect

Inactive Publication Date: 2016-12-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the pore size of SiOC ceramic airgel is difficult to control in the existing method, and to provide a preparation method of SiOC ceramic airgel

Method used

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  • Preparation method of SiOC ceramic aerogel
  • Preparation method of SiOC ceramic aerogel
  • Preparation method of SiOC ceramic aerogel

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specific Embodiment approach 1

[0026] Specific embodiment one: the preparation method of a kind of SiOC ceramic airgel of the present embodiment is carried out according to the following steps:

[0027] 1. Weigh 1 to 10 parts of hydrogen-containing polymethylsiloxane, 1 to 10 parts of 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetra Siloxane, 0.1-1 part of chloroplatinic acid and 20-98 parts of acetone, set aside;

[0028] 2. 1-10 parts of hydrogen-containing polymethylsiloxane, 1-10 parts of 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetra Siloxane, 0.1-1 part of chloroplatinic acid and 20-98 parts of acetone are evenly mixed and placed in a hydrothermal reaction kettle, and then the hydrothermal reaction kettle is put into an oven preheated to a temperature of 120-160°C. Keep the temperature at 120-160°C for 240min-350min, then cool naturally to room temperature to obtain a gel;

[0029] 3. Soak the gel obtained in step 2 for 2 to 5 times with acetone, each time for 24 hours, then soak the gel with etha...

specific Embodiment approach 2

[0032] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step 2, put the hydrothermal reactor into an oven preheated to a temperature of 140°C, and keep it warm for 240min to 350min at a temperature of 140°C , and then cooled naturally to room temperature. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step two, put the hydrothermal reaction kettle into an oven that is preheated to a temperature of 120-160°C. Keep warm for 260min under the condition, then cool down to room temperature naturally. Others are the same as in the first or second embodiment.

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Abstract

Provided is a preparation method of SiOC ceramic aerogel. The invention relates to an aerogel material preparation technology, in particular to a preparation method of the SiOC ceramic aerogel. The problem that for an existing method for preparing the SiOC ceramic aerogel, the aperture is difficult to control is solved. The method comprises the steps that hydrogen-containing polymethylsiloxane, 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, chloroplatinic acid and acetone are mixed to be uniform and then put into a hydrothermal reaction kettle for reacting, and gel is obtained; the gel is soaked with acetone and ethyl alcohol in sequence, supercritical drying treatment is conducted, the temperature is increased to 700 DEG C to 1,300 DEG C under a nitrogen or argon atmosphere, heat preservation is conducted for 1 h to 3 h, natural cooling is conducted to room temperature, and the SiOC ceramic aerogel is obtained. The SiOC ceramic aerogel has the advantages of being high in specific surface area, narrow in pore diameter distribution, stable in structure and stable in temperature resistance and oxidation resistance and can be applied to the fields of thermal insulation, energy storage and the like.

Description

technical field [0001] The invention relates to airgel material preparation technology, in particular to a preparation method of SiOC ceramic airgel. Background technique [0002] Airgel is a porous material with nanostructure, which has unique properties in terms of mechanics, acoustics, thermals, optics and energy storage. Due to the special pore structure of airgel, the material has extremely low thermal conductivity and a large specific surface area, so it is an ideal thermal insulation material. In addition, nano-structured airgel can also be used as a new type of gas filter. Different from other materials, airgel has a uniform pore size distribution and high porosity, making it an efficient gas filter material. [0003] At present, the most widely studied are silica aerogels, alumina aerogels, zirconia aerogels and carbon aerogels. The preparation methods of these aerogels are usually composed of sol-gel process and supercritical drying process. In order to prevent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/56C04B35/624
CPCC04B38/0045C04B35/5603C04B35/624C04B2235/483C04B38/0054
Inventor 张幸红杜斌洪长青胡平周长灵
Owner HARBIN INST OF TECH
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