Supercritical drying method of nonwoven/silicon-aluminium aerogel composite insulation board
A technology of supercritical drying and composite heat preservation, which is applied in the direction of airgel preparation, drying solid materials, chemical instruments and methods, etc., can solve the problems of complex gelation process, high production cost, and complicated preparation process, and achieve slight powder loss , high production efficiency and low equipment requirements
Pending Publication Date: 2016-07-06
ZHUO DA NEW MATERIAL TECH GRP
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Problems solved by technology
Therefore, the production cost of raw materials for the traditional preparation of alumina airgel is expensive, and the gel process is complicated; if tetraethyl silicate is used for the preparation of traditional alumina airgel, the gel sol process also needs to undergo hydrolysis and polycondensation of raw materials. The preparation process is more complicated
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[0034] 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.
[0035] The process of preparing silicon-aluminum composite airgel by inorganic salt method:
[0036] First configure a sodium metaaluminate solution with a certain mass concentration and stir until the sodium metaaluminate is completely hydrolyzed; then, dilute the water glass to meet the requirements of the process ratio; under stirring conditions, add Continue to stir the required amount of sodium metaaluminate solution for 1 to 2 minutes. When the solution is ensured to be e...
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Abstract
The invention provides a supercritical drying method of a nonwoven / silicon-aluminium aerogel composite insulation board. The method is characterized by firstly carrying out solvent exchange and hydrophobic modification on nonwoven / silicon-aluminium wet gel, then putting hydrophobically modified wet gel in a high pressure reactor, pouring a supercritical medium, setting the heating temperature, carrying out heating and carrying out outgassing or reflux after the medium in the reactor is in a supercritical state to bring out a solvent in wet gel until the solvent is completely recovered, wherein the supercritical medium is an acetonitrile, ethanol or carbon dioxide solvent. The supercritical drying method provided by the invention has the excellent effects that the product produced by the method has high yield and high production efficiency, dusts slightly and can undergo industrial scaling up; the supercritical drying method can be integrated onto assembly lines; the whole preparation method is simple and easy to control, avoids strong acid and alkali corrosion, has low requirements for equipment and is suitable for industrial production after scaling up.
Description
technical field [0001] The invention relates to a drying method for a thermal insulation board, in particular to a supercritical drying method for a non-woven fabric / silicon aluminum airgel composite thermal insulation board. 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 pressu...
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IPC IPC(8): B01J13/00C01B33/32F26B3/00
CPCB01J13/0091F26B3/00C01B33/32
Inventor 杨卓舒纪勇孟宪娴
Owner ZHUO DA NEW MATERIAL TECH GRP