A kind of atmospheric pressure drying prepares the method for bulky flexible airgel

A dry and flexible technology at atmospheric pressure, applied in the field of aerogel materials, the preparation of bulk flexible aerogels by atmospheric pressure drying, can solve the problems of pore size, broken pore structure, etc., achieve high porosity, low density, support Stress uniformity effect

Active Publication Date: 2018-08-07
正一集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects such as uneven stress of the airgel support body prepared by normal pressure drying, which easily leads to pore size and pore structure breakage, the present invention provides a method for preparing large flexible airgel by normal pressure drying. Its outstanding feature is that The fiber crystal nuclei are dispersed in the wet gel, and the crystal nuclei grow to form uniformly dispersed nanofibers through continuous graded heating and reaction control, and further grow and connect to form a uniform supporting stress on the gel network

Method used

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  • A kind of atmospheric pressure drying prepares the method for bulky flexible airgel

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Mix deionized water and industrial water glass evenly, stir well, add acetic acid solution, adjust the pH to 5-8, and leave it for 1 hour to form a hydrogel;

[0030] (2) Pour the hydrogel obtained in step (1) into a leachable block mold, and continuously age it through 25% ammonia-containing ammonia solution, then rinse with water to obtain the aged wet gel, and place it naturally through the leachable The mold drains naturally;

[0031] (3) The aging wet gel obtained in step (2) is dried at a temperature of 60-80℃, and the drying time is controlled at 35 minutes. After the first drying, enough liquid phase is filled in the gel pores, The decrease in glue volume is equal to the volume of liquid evaporation. At this time, the gel network will not collapse and has toughness, and then continuously pass the calcium chloride solution saturated with the fiber crystal nucleus solution to make the fiber crystal nucleus enter the gel network;

[0032] (4) The gel obtained in step...

Embodiment 2

[0036] (1) Mix deionized water and industrial water glass uniformly, stir evenly, add sulfuric acid solution, adjust the pH to 5-8, and leave it for 1 hour to form a hydrogel;

[0037] (2) Pour the hydrogel obtained in step (1) into a leachable block mold, continuously age through ammonia solution, and then rinse with water to obtain an aged wet gel;

[0038] (3) The aging wet gel obtained in step (2) is dried at a temperature of 60-80℃, and the drying time is controlled at 25 minutes. After the first drying, enough liquid phase is filled in the gel pores, and the gel The decrease in glue volume is equal to the volume of liquid evaporation. At this time, the gel network will not collapse and is tough, and then continuously pass through the calcium acetate fiber crystal nucleus liquid to make the fiber crystal nucleus enter the gel network;

[0039] (4) The gel obtained in step (3) is continuously passed through sodium silicate aqueous solution and sodium hydroxide aqueous solution, a...

Embodiment 3

[0043] (1) Mix deionized water and industrial water glass evenly, stir evenly, add citric acid solution, adjust the pH to 5-8, and leave it for 1 hour to form a hydrogel;

[0044] (2) Pour the hydrogel obtained in step (1) into a leachable block mold, continuously age through ammonia solution, and then rinse with water to obtain an aged wet gel;

[0045] (3) The aging wet gel obtained in step (2) is dried at a temperature of 60-80℃, and the drying time is controlled at 30 minutes. After the first drying, enough liquid phase is filled in the gel pores, and The decrease in glue volume is equal to the volume of liquid evaporation. At this time, the gel network will not collapse and is tough, and then continuously pass through the calcium nitrate fiber crystal nucleus liquid to make the fiber crystal nucleus enter the gel network;

[0046] (4) The gel obtained in step (3) is continuously passed through sodium silicate aqueous solution and sodium hydroxide aqueous solution, and is initiat...

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Abstract

The invention belongs to the field of heat insulation and particularly relates to an aerogel material. A method for preparing bulk-shaped flexible aerogel through normal-pressure drying is provided aiming at the defects that when aerogel is prepared through normal-pressure drying in the prior art, fibers and other supports are directly added, and stress is not uniform, so that hole diameters and hole structures are broken. According to the method, fiber crystal nuclei are dispersed in wet gel, the crystal nuclei grow through continuous graded heating and reaction control to form uniformly-dispersed nano-fibers, further growth connection is carried out, and uniform supporting stress is provided for a gel network. Meanwhile, the nano-fibers grow in nano network holes of the gel, and the supporting effect of the nano-fibers is more excellent. The bulk-shaped aerogel obtained through normal-pressure drying is integral and uniform in network structure, low in density, high in porosity and good in strength and toughness.

Description

Technical field [0001] The invention belongs to the field of heat preservation and heat insulation, and particularly relates to aerogel materials, in particular to a method for preparing bulky flexible aerogel by atmospheric drying. Background technique [0002] Due to its nanoporous structure, low density, low dielectric constant, low thermal conductivity, high porosity, high specific surface area, etc., aerogels show unique properties in mechanics, acoustics, heat, optics and other aspects. Due to the high cost of preparing aerogels, it has been used in high-end fields such as aerospace and military. However, with the continuous improvement of technology, its cost continues to decrease, so it has great potential for civilian applications. Aerogel is by far the material with the best thermal insulation performance, especially in the fields of petroleum, chemical, and construction thermal insulation will become the mainstream. [0003] Aerogel is the reaction of a chemical soluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24C04B38/00
CPCC04B28/24C04B2201/32C04B2201/50C04B14/38C04B38/0045
Inventor 陈庆曾军堂
Owner 正一集团有限公司
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