Supercritical drying method of sodium metaaluminate modified resin purified water-glass aerogel

A technology of supercritical drying and sodium metaaluminate, which is applied in chemical instruments and methods, silicate, inorganic chemistry, etc., can solve the problem of unsatisfactory thermal conductivity and density of airgel, complex sol-gel process, and process amplification cost Advanced problems, to achieve the effect of cheap production raw materials, simple and easy-to-control preparation methods, and convenient industrial production

Pending Publication Date: 2016-07-20
ZHUO DA NEW MATERIAL TECH GRP
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Problems solved by technology

However, the preparation of silica/alumina composite airgel is rarely reported. Even if the composite gel has been prepared, the alkoxide method is used for gelation.
[0004] Tetraethyl silicate is used as the raw material, and the raw mater

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  • Supercritical drying method of sodium metaaluminate modified resin purified water-glass aerogel
  • Supercritical drying method of sodium metaaluminate modified resin purified water-glass aerogel

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Embodiment Construction

[0030] The following will be further described in detail in conjunction with specific embodiments to clearly and completely describe the technical solutions of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0031] The preparation process of airgel: first, use acid-base solution to treat the cationic resin; then, dilute the water glass according to the process requirements, purify with the treated resin, remove sodium ions, and obtain the airgel with a pH of 2-3 solution; under stirring conditions, add sodium metaaluminate solution dropwise to the above solution, adjust the pH value of the mixed solution to 4-5, and let it stand for 30 minutes to obtain a wet gel. Finally, perform s...

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Abstract

The invention provides a supercritical drying method of sodium metaaluminate modified resin purified water-glass aerogel.Firstly, solvent replacement and hydrophobic modification are conducted on wet gel, then the wet gel subjected to the hydrophobic modification is put into a high-pressure reaction kettle, a supercritical medium is poured into the kettle, the heating temperature is set for heating, and degassing or reflux is performed to bring out the solvent in the wet gel till solvent recovery is completed after the medium in the reaction kettle reaches a supercritical state, wherein the supercritical medium is an acetonitrile, ethanol or carbon dioxide solvent.The product produced by adopting the supercritical drying method is high in product yield and high in production efficiency, slightly comes off and can be subjected to industrialized amplification.The supercritical drying method can be integrated to a production line.The whole preparation method is simple and easy to operate, free of strong acid and alkali corrosion, low in equipment requirement and suitable for industrial production after amplification.

Description

technical field [0001] The invention relates to an airgel drying method, in particular to a supercritical drying method for sodium metaaluminate modified resin purified water glass airgel. Background technique [0002] Airgel is the material with the lowest thermal conductivity among solid substances, which is only slightly higher than vacuum, about 0.013W / m·K. Airgel also has an extremely low density, which is recognized as the least dense solid in the world, and the lowest density can reach 3kg / m 3 , which is slightly denser than air. Therefore, airgel is the thermal insulation material with the best thermal insulation effect and the smallest density in the world. [0003] At present, there are many types of aerogels, including carbon aerogels, silicon-based aerogels, and alumina aerogels. The raw material for the preparation of silica airgel can be tetraethyl silicate or water glass, and the preparation process can use normal pressure method and supercritical method re...

Claims

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Application Information

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IPC IPC(8): C01B33/32
CPCC01B33/325
Inventor 杨卓舒纪勇孟宪娴
Owner ZHUO DA NEW MATERIAL TECH GRP
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