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Porous composite aerogel material as well as preparation method and application thereof

A composite aerogel and composite technology, applied in the field of materials, can solve the problems of difficulty in restriction, high drying cost, etc., and achieve the effects of low cost, superior thermal insulation performance, and high hydrophobicity.

Active Publication Date: 2014-01-22
GUANGDONG ALISON HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the announced drying technology, for example, supercritical drying is a way to achieve it, but because supercritical drying is very expensive, and for supercritical fluids, it has certain restrictions on solvents. For example, supercritical carbon dioxide fluid is difficult Smooth direct drying of wet gels containing a large amount of water, which limits the difficulty of direct drying, such as taking a variety of treatment measures, such as solvent exchange, which undoubtedly increases the cost of supercritical drying, which is already expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a porous composite airgel material, comprising the steps of:

[0027] (1) Prefabricate the 0.5m high and 0.5m roll diameter fiber reinforced body with the fiber carrier fiber felt, then put it in the reaction vessel, seal it and then vacuumize it, the vacuum degree is 1Mpa;

[0028] (2) Prefabricated water glass solution, the mass concentration of the water glass solution is 5%, start the pump, suck the prefabricated water glass solution into the reaction vessel until the fiber reinforcement is covered;

[0029] (3) Pump in carbon dioxide gas until the pH is 5, the gas is continuously dissolved in the water glass solution, adjust the temperature to 20°C to stop pumping, and let it stand for 0.5h until the gel no longer flows and forms wet condensation through the visible window of the reaction vessel For the gel-reinforcement compound, pump in a pre-prepared 1wt% aqueous solution of sodium dodecylsulfonate as a surfactant until the liquid level i...

Embodiment 2

[0034] A preparation method of a porous composite airgel material, comprising the steps of:

[0035] (1) The fiber reinforcement is prefabricated by the fiber carrier fiber block, the length of the fiber reinforcement is 0.5 meters, and the width is 0.3 meters. The fiber reinforcement is pressed into felt blocks of different densities and placed in the reaction vessel after sealing. Vacuumize, the vacuum degree is 1Mpa;

[0036] (2) Prepare a water glass solution with a concentration of 18%, and add the sunscreen agent titanium dioxide with a final concentration of 1% (w / v) by volume, stir and mix to disperse evenly, turn on the pump, and suck the water glass solution containing the sunscreen into the device For reaction vessels with fiber blocks, until the liquid level is higher than the maximum liquid level of the fiber reinforcement;

[0037] (3) Pump in carbon dioxide gas until the pH is 5.5, the gas is continuously dissolved in the water glass solution, adjust the temper...

Embodiment 3

[0042] A preparation method of a porous composite airgel material, comprising the steps of:

[0043](1) The fiber reinforced body is prefabricated by the fiber carrier fiber mat. The length of the fiber reinforced body is 1 meter and the width is 0.5 meter. The fiber reinforced body is pressed into mat blocks of different densities and placed in the reaction vessel and sealed. Vacuum, the vacuum degree is 1Mpa;

[0044] (2) Prepare a water glass solution with a concentration of 20wt%, and add an opacifying agent carbon black with a final concentration of 2% by volume (w / v), stir to mix and disperse evenly, turn on the pump, and suck the water glass solution containing the opacifying agent into the device Reaction vessel with fiber needle felt until the liquid level is higher than the maximum liquid level of the fiber reinforcement;

[0045] (3) Pump in carbon dioxide gas until the pH is 6, the gas is continuously dissolved in the water glass solution, raise the temperature to...

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Abstract

The invention discloses a preparation method and application of a porous composite aerogel material. The method comprises the following steps of: prefabricating reinforcement, placing the reinforcement in a reaction container, sealing and vacuumizing, sucking prefabricated sodium silicate liquor until the reinforcement is submerged; pumping an acidic gas in, heating up, then standing to form a wet gel reinforcement composite; pumping in surfactant aqueous liquor for immersion reaction, rotating the wet gel reinforcement composite so that liquid liquor in the composite is thrown out; stopping rotation, pumping in mixed liquor of an organic solvent and the surfactant, discharging overflowed liquor after reaction; heating up, evaporating the organic solvent, carrying out vacuum treatment, and releasing pressure to obtain the porous composite aerogel material. The preparation method related in the invention can be used for obtaining the porous composite aerogel material which has the advantages of low heat conduction efficiency, good hydrophobic performance and high hydrophobic performance and low cost and is simple to operate.

Description

technical field [0001] The invention relates to the field of materials, in particular to a porous composite airgel material and its preparation method and application. Background technique [0002] Most of the airgel production processes that appear now are discontinuous operations, or the implementation steps are carried out in multiple areas and multiple links. The airgel produced and prepared is also a narrowly defined "aerogel", which is subjected to external forces from various links. Influenced, some wet gel skeletons have collapsed, and then dried to produce airgel, some of the particles are actually xerogels. At the same time, the drying method is mostly supercritical drying or general atmospheric pressure drying. To realize aerogel in a broad sense, it is necessary to increase the porosity of the airgel and realize the gas distribution in the material of the gel skeleton, and it is necessary to maintain intact pores. At the same time, when the finished product is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02B01J20/10
Inventor 张秋华卫荣辉刘平
Owner GUANGDONG ALISON HI TECH
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