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Preparation method of nanometer aerogel heat-insulation coating

A technology of nano-airgel and thermal insulation coatings, applied in the direction of polyester coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of poor thermal insulation effect and ineffective inhibition of heat conduction, etc., to reduce the contact area, Effect of reducing heat transfer and increasing heat conduction path

Inactive Publication Date: 2011-06-01
李志
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particles of this kind of material are in the micron level, and the "air pockets" formed are also larger than the free path of air thermal movement, the effect of inhibiting heat conduction is not obvious, and the heat preservation effect is poor.

Method used

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  • Preparation method of nanometer aerogel heat-insulation coating
  • Preparation method of nanometer aerogel heat-insulation coating
  • Preparation method of nanometer aerogel heat-insulation coating

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The preparation method of a kind of nano-airgel thermal insulation coating described in embodiment 1 of the present invention comprises the following steps:

[0028] 1) Mix and hydrolyze tetraethyl orthosilicate, 1% hydrochloric acid solution, absolute ethanol and water for 12 hours, and the weight-number ratio of the above-mentioned components is 1:0.1:6:0.5;

[0029] 2) After the step 1) is hydrolyzed, add 1% ammonia solution in mass concentration, the ratio of the liquid after hydrolysis to the ammonia solution by weight is 1:0.1-0.2, and react for 18-48 hours to obtain silica gel ;

[0030] 3) Place the silica gel produced in step 2) in absolute ethanol for aging treatment for 12-36 hours;

[0031] 4) Put the silica gel after the aging treatment in step 3) into a mixture of trimethylchlorosilane and n-pentane for modification, the ratio of the mixture is 1:5-50, every 24-48 hours Replace the mixture once, repeat this process 3-5 times;

[0032] 5) Dry the silica ...

Embodiment 2

[0035] The preparation method of a kind of nano-airgel thermal insulation coating described in embodiment 2 of the present invention, comprises the following steps:

[0036] 1) Mix and hydrolyze tetraethyl orthosilicate, 1% hydrochloric acid solution, absolute ethanol and water for 12 hours, and the weight-number ratio of the above-mentioned components is 1:0.1:6:0.5;

[0037] 2) After step 1) is hydrolyzed, add 1% ammonia solution in mass concentration, the ratio of parts by weight of the liquid after hydrolysis to the ammonia solution is 1:0.1-0.2, and silica gel is obtained after 18-48 hours;

[0038] 3) Put the silica gel produced in step 2) in absolute ethanol for aging treatment for 12-36 hours;

[0039] 4) Put the silica gel after the aging treatment in step 3) into a mixture of trimethylchlorosilane and n-hexane for modification, the weight ratio of the mixture is 1:5-100, every 24-48 Replace the mixture every hour, repeat this process 3-5 times;

[0040] 5) Drying t...

Embodiment 3

[0043] A kind of preparation method of nano-airgel thermal insulation coating described in embodiment 3 of the present invention, comprises the following steps:

[0044] 1) Mix and hydrolyze tetraethyl orthosilicate, 1% oxalic acid solution, absolute ethanol and water for 24 hours, and the weight ratio of the above components is 1:0.5:6:0.5;

[0045] 2) After step 1) is hydrolyzed, add 1% ammonia solution in mass concentration, the ratio of parts by weight of liquid after hydrolysis to ammonia solution is 1:0.1-0.2, and obtain silica gel after 18-48 hours;

[0046] 3) Put the silica gel produced in step 2) in absolute ethanol for aging treatment for 12-36 hours;

[0047] 4) Put the silica gel after aging treatment in step 3) into a mixture of trimethylchlorosilane and n-hexane for modification, the weight ratio of the mixture is 1:5-100, every 24-48 Replace the mixture every hour, repeat this process 3-5 times;

[0048] 5) Dry the modified silica gel in step 4) at 20-90°C fo...

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Abstract

The invention relates to a preparation method of nanometer aerogel heat-insulation coating, which comprises the following steps: dissolving aerogel, solidifying the aerogel, aging, replacing by a surface modification solvent, drying at normal pressure and preparing lyophobic silicon dioxide aerogel; or supercritically drying and preparing hydrophilic silicon dioxide aerogel. The preparation method provided by the invention has the beneficial effects that the aperture of the silicon dioxide aerogel prepared by adopting the method provided by the invention is in nanometer-level distribution, and the main aperture of the silicon dioxide aerogel is10nm and is less than the free path of an air molecular movement, thereby greatly reducing the heat transfer generated by a gas molecular heat movement; the aerogel in the invention is in a network structure formed by overlapping the spherical granules of nanometer silicon dioxide, thereby reducing the contact area of solid granules, increasing the heat transfer path and further achieving the effects of heat maintenance and heat insulation; and lyophobic and hydrophilic type silicon dioxide aerogel can be prepared according to different drying processes to be used by matching organic or inorganic coatings.

Description

technical field [0001] The invention relates to the field of chemical coatings, in particular to a preparation method of nano-airgel thermal insulation coatings. Background technique [0002] As the country has advocated the establishment of a conservation-oriented society in recent years, various industries are developing new methods and techniques for energy conservation. Among them, the construction process of coatings is simple, seamless construction can be realized, and the existence of thermal bridges can be reduced. Therefore, thermal insulation coatings have become a new research hotspot. [0003] Thermal insulation coatings are usually divided into two categories: 1. Reflective thermal coatings, which are developed on the basis of aluminum-based reflective thermal insulation coatings. High reflectivity coatings are obtained by selecting metal or metal fillers, resins and production processes. Coating that reflects infrared light for thermal insulation purposes. 2....

Claims

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Application Information

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IPC IPC(8): C09D201/00C09D7/12C09D5/00C09D167/08C09D163/00C09D1/00C09D133/04C09D175/04C09D167/00C09D133/02C01B33/16
Inventor 王非李志
Owner 李志
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