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Preparation method of light heat-insulating mullite nanofiber aerogel

A nanofiber, lightweight heat insulation technology, applied in the direction of ceramic products, applications, home appliances, etc., can solve the problem of improving heat insulation performance

Active Publication Date: 2019-08-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the macropores produced by the sublimation of freeze-dried ice crystals are not conducive to the improvement of thermal insulation performance.

Method used

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  • Preparation method of light heat-insulating mullite nanofiber aerogel
  • Preparation method of light heat-insulating mullite nanofiber aerogel
  • Preparation method of light heat-insulating mullite nanofiber aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Cut the mullite nanofiber membrane to 10mm with scissors 2 Size, weigh 0.2g of fiber film and add it to 50ml of ethanol, disperse it with a high-speed disperser at 3000r / min for 5min, take out the suspension above it and dry it to obtain a single fiber.

[0026] (2) Take 5g tetraethyl orthosilicate, 3g ethanol, 2g deionized water, drop 3 drops of 0.1mol / L dilute nitric acid therein, magnetic stirring makes the solution clear and transparent to obtain 50wt% silica sol; weigh 0.08g Put the silica sol into the mold, add 1.92g of water, 0.1g of acrylamide, 0.005g of N-N methylenebisacrylamide, stir well to dissolve it.

[0027] (3) Add 0.05g fiber to the mold, stir to disperse evenly, then add 3 drops of ammonium persulfate aqueous solution, 1 drop of tetramethylethylenediamine aqueous solution, seal and keep warm at 50°C for 20min to make it gel .

[0028] (4) Put the gelled sample into an ultra-low temperature freezer to freeze at -80°C for 24 hours, take it out and...

Embodiment 2

[0030] (1) Cut the mullite nanofiber membrane to 10mm with scissors 2 Size, weigh 0.2g of fiber film and add it to 50ml of ethanol, disperse it with a high-speed disperser at 3000r / min for 5min, take out the suspension above it and dry it to obtain a single fiber.

[0031] (2) Take 5g tetraethyl orthosilicate, 3g ethanol, 2g deionized water, drop 3 drops of 0.1mol / L dilute nitric acid therein, magnetic stirring makes the solution clear and transparent to obtain 50wt% silica sol; weigh 0.08g Put the silica sol into the mold, add 1.92g of water, 0.1g of acrylamide, 0.005g of N-N methylenebisacrylamide, stir well to dissolve it.

[0032] (3) Add 0.05g fiber to the mold, stir to disperse evenly, then add 3 drops of ammonium persulfate aqueous solution, 1 drop of tetramethylethylenediamine aqueous solution, seal and keep warm at 50°C for 20min to make it gel .

[0033] (4) Put the gelled sample into an ultra-low temperature freezer to freeze at -80°C for 24 hours, take it out and...

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Abstract

The invention provides a preparation method of light heat-insulating mullite nanofiber aerogel with ultra-low solid content. The preparation method comprises the following steps: dispersing a nano mullite fiber membrane to obtain mullite single fibers; mixing silica sol and acrylamide system gel injection molding premix with the dispersed mullite single fibers to prepare gel; and freeze-drying thegel to obtain an aerogel blank, and finally calcining at high temperature to obtain the mullite nanofiber aerogel product. The product is light in weight, high in porosity and low in thermal conductivity, and the preparation method of the nanofiber aerogel which can be used at the temperature of 1300 DEG C is provided.

Description

technical field [0001] The invention relates to the preparation of lightweight heat-insulating mullite airgel, in particular to a preparation method of light-weight heat-insulating mullite nanofiber airgel, and belongs to the technical field of nanofiber airgel preparation. Background technique [0002] Airgel, which is formed by the aggregation of ultrafine particles to form a porous network structure, has extremely low density and thermal conductivity. important role. However, due to the high activity of nanoparticles, the structure of airgel will collapse at high temperature, and its effective use temperature is generally below 1200 °C. With the development of aircraft and thermal equipment in the direction of light weight, high efficiency and energy saving, especially aerospace fighters with high Mach number, long endurance, and repeated trips to and from the atmosphere have gradually become the focus of military competition in various countries. Ultralight heat-insula...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B35/14C04B35/80C04B35/624
CPCC04B35/803C04B35/14C04B35/624C04B38/0045C04B2235/5228C04B2235/6562C04B2235/6567C04B2235/9607
Inventor 郭安然张莹刘瑞丽刘家臣杜海燕关星宇
Owner TIANJIN UNIV
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