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Preparation method of high temperature resistant SiC aerogel

An aerogel, high temperature resistant technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low yield and easy damage to the microstructure of aerogel, and achieve the effect of simplifying raw material components

Active Publication Date: 2020-01-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing high-temperature-resistant SiC aerogels in order to solve the technical problems of low yield and easy damage of the microstructure of the aerogels in the existing methods for preparing SiC aerogels

Method used

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  • Preparation method of high temperature resistant SiC aerogel
  • Preparation method of high temperature resistant SiC aerogel
  • Preparation method of high temperature resistant SiC aerogel

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specific Embodiment approach 1

[0044] Specific embodiment 1: The preparation method of high temperature resistant SiC airgel in this embodiment is carried out according to the following steps:

[0045] 1. Weigh 9.9g R 1 Si(OR 2 ) 3 And 7.6g methyl orthosilicate, after magnetic stirring for 5min, mixed solution A was obtained;

[0046] 2. Weigh 46g of ethanol, 1.8g of deionized water and 0.25g of Span-20 and mix to obtain the mixed solution B;

[0047] 3. Mix the mixed solution A and the mixed solution B, drop 0.5 mL of hydrochloric acid with a concentration of 1 mol / L and stir magnetically for 2 hours at room temperature to obtain a hydrolyzed solution;

[0048] 4. Take 25mL of hydrolyzate, drop into it 0.5mL of ammonia water with a concentration of 1mol / L, transfer it to a closed container, and place it in an oven at 50°C for 0.5h-10h to obtain a wet gel;

[0049] 5. Aging the wet gel with 25mL methanol at 50°C for 24h, then exchanging twice with 25mL ethanol and three times with 25mL n-hexane, and dry...

specific Embodiment approach 2

[0052] Specific embodiment two: the difference between this embodiment and specific embodiment one is that R described in step one 1 Si(OR 2 ) 3 , where R 2 =CH 3 or CH 2 CH 3 , R 1 = Aromatic hydrocarbons or alkanes with carbon number ≥ 6. Others are the same as the first embodiment.

specific Embodiment approach 3

[0053] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the R described in step one 1 Si(OR 2 ) 3 For phenyl trimethoxysilane. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of high-temperature resistant SiC aerogel, relates to a preparation method of aerogel, and aims to solve the technical problems of low yield and easily damaged microstructure of the existing method for preparing the SiC aerogel. The method comprises the following steps: 1, preparing liquid A and liquid B and mixing the liquid A and the liquid B to obtain hydrolysate; (2) preparing wet gel; (3) preparing aerogel; (4) reacting the aerogel with magnesium powder, cleaning and drying to obtain the SiC aerogel. The method adopts magnesium thermal reduction to reduce an aerogel precursor into the SiC aerogel under the protection of an inert gas. The production of SiO gas during the reduction of R1SiO1.5 is successfully avoided, and the morphology of the product is kept intact to the greatest extent. The silicone aerogel with uniform pore structure and complete shape is prepared by supercritical drying, and belongs to the field of aerogel preparation.

Description

technical field [0001] The invention relates to a preparation method of airgel. Background technique [0002] As a three-dimensional porous material with high porosity, airgel has the characteristics of low density, high specific surface area, low thermal conductivity, and high acoustic resistance, so it is widely used in thermal insulation, sound insulation, adsorption, catalysis and other fields. At present, the reported aerogels are silicon-based (SiO 2 airgel), carbon-based (carbon aerogel, graphene aerogel, cellulose aerogel) and metal oxide-based (Al 2 o 3 airgel) mainly. However, there are more or less problems with such materials: [0003] For SiO 2 Although airgel has a good thermal insulation coefficient, its own high temperature resistance is poor. When the temperature is higher than 600 °C, the three-dimensional porous framework is easy to collapse and lose its thermal insulation capacity; for carbon aerogel, its oxidation resistance is poor. , is easily ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/963
CPCC01B32/963
Inventor 杨春晖张磊李季
Owner HARBIN INST OF TECH
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