Preparation method of solar selective-absorption thin film with spinel structure

A technology of spinel structure and selective absorption, which can be applied to radiation-absorbing coatings, devices for coating liquids on surfaces, and special surfaces, etc. It can solve the problems of inability to highlight the hyperspectral selectivity of thin films, cumbersome preparation processes, and experimental conditions. Higher requirements and other issues, to achieve the effect of improving light-to-heat conversion efficiency, simple and controllable process, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2014-04-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two sol-gel processes for preparing selective absorption films both need to prepare two kinds of sols for mixing. The preparation process is relatively complicated, and the absorption rate is low, which cannot highlight the high spectral selectivity of the film.
Patent CN102087054A used the sol-gel method to construct a three-layer selective absorption film system on the basis of the previous one, followed by M-Al with high metal content 2 o 3 Absorbing base layer prepared by mixed sol, M-Al with medium metal content 2 o 3 Absorption interlayer prepared by mixed sol and SiO 2 The anti-reflection top layer, the prepared film has an absorptivity of up to 0.92, which makes up for the defect that the absorptivity of the single-layer film is not high, but the entire preparation process is cumbersome and requires heat treatment in an inert atmosphere, which requires high experimental conditions

Method used

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  • Preparation method of solar selective-absorption thin film with spinel structure
  • Preparation method of solar selective-absorption thin film with spinel structure
  • Preparation method of solar selective-absorption thin film with spinel structure

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1. Weigh 2.42gCu(NO 3 ) 2 ·3H 2 O, 2.37gMn(Ac) 2 4H 2 O, 0.97gCo(NO 3 ) 2 ·6H 2 O was placed in a 100ml beaker, and 58ml of absolute ethanol was added and stirred to dissolve for 20 minutes. The total molar concentration of metal ions was 0.40mol / L.

[0022] 2. Add 4.9 g of citric acid monohydrate to the above solution, the molar ratio of citric acid to metal ions is 1:1, stir at room temperature for 1 hour, then add polyethylene glycol 200 to 3.73 g, the mixture of polyethylene glycol 200 and citric acid The molar ratio was 0.8:1, and the stirring was continued at room temperature for 1 hour, and finally 0.61 g of hydroxypropyl cellulose was slowly added and magnetically stirred for 4 hours to obtain a film-forming sol.

[0023] 3. Degrease the stainless steel sheet with a degreasing solution, then ultrasonically wash it with ethanol and acetone for 15 minutes, rinse it with deionized water, and dry it for later use. Using the dipping and pulling method on a co...

Embodiment 2

[0026] 1. Weigh 2.42gCu(NO 3 ) 2 ·3H 2 O, 2.37gMn(Ac) 2 4H 2 O, 0.97gCo(NO 3 ) 2 ·6H 2 O was placed in a 100ml beaker, and 78ml of absolute ethanol was added to stir and dissolve for 20 minutes. The total molar concentration of metal ions was 0.30mol / L.

[0027] 2. Add 4.9g of citric acid monohydrate to the above solution, the molar ratio of citric acid to metal ions is 1:1, after stirring at room temperature for 1 hour, add polyethylene glycol 200 to be 4.66g, the mixture of polyethylene glycol 200 and citric acid The molar ratio was 1:1, and the stirring was continued at room temperature for 1 hour, and finally 0.78 g of hydroxypropyl cellulose was slowly added and magnetically stirred for 4 hours to obtain a film-forming sol.

[0028] 3. Degrease the aluminum sheet with a degreasing solution, then ultrasonically wash it with ethanol and acetone for 15 minutes, rinse with deionized water, and dry it for later use. Using dipping and pulling method on constant speed pu...

Embodiment 3

[0032] 1. Weigh 1.71g Cu(Cl) 2 2H 2 O, 2.37gMn(Ac) 2 4H2 O, 0.79gCo(Cl) 2 ·6H 2 O was placed in a 100ml beaker, and 70ml of absolute ethanol was added to stir and dissolve for 20 minutes. The total molar concentration of metal ions was 0.33mol / L.

[0033] 2. Add 5.88g of citric acid monohydrate to the above solution, the molar ratio of citric acid to metal ion is 1.2:1, stir at room temperature for 1 hour, add polyethylene glycol 200 to 6.71g, the mixture of polyethylene glycol 200 and citric acid The molar ratio was 1.2:1, and stirring was continued at room temperature for 1 hour, and finally 0.74 g of ethyl cellulose was slowly added and magnetically stirred for 4 hours to obtain a film-forming sol.

[0034] 3. Degrease the aluminum sheet with a degreasing solution, then ultrasonically wash it with ethanol and acetone for 15 minutes, rinse with deionized water, and dry it for later use. Using dipping and pulling method on the constant speed pulling machine, use the abov...

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Abstract

The invention belongs to the field of solar heat utilization, and discloses a preparation method of a solar selective-absorption thin film with a spinel structure. The selective-absorption thin film is subjected to pulling and film plating through a sol-gel method and is formed by roasting. The preparation method is characterized in that metal salt of copper, cobalt and manganese is used as a sol precursor body, alcohol is used as a solvent, metal sol impregnation liquid is prepared by mixing the sol precursor body and the solvent with hydroxyl carboxylic acid and polyethylene glycol 200 according to a certain ratio, a layer of thin film can be plated on a metal substrate having an infrared reflection characteristic by adopting a pulling method after a film forming agent is added, an obtained thin film has higher solar absorption rate (0.90-0.93) and lower emissivity (0.05-0.07) after being subjected to 80-100 DEG C solidification for 30-60 minutes and then being subjected to 500 DEG C heat treatment for 30-60 minutes, and the photo-thermal conversion efficiency of a solar heat collector can be effectively increased.

Description

technical field [0001] The invention belongs to the field of solar thermal utilization, and in particular relates to a preparation method of a solar selective absorption film using a spinel-type transition metal composite oxide as a light absorbing agent. Background technique [0002] The heat utilization of solar energy is the most important field in the application of solar energy. The basic method is to use solar collectors to convert solar radiation into heat energy. The solar spectrum selective absorption surface (referred to as selective absorption surface, or absorption surface) is the most important part of solar collectors. Among the many types of selective absorption surfaces, the selective absorption film system is the most cost-effective and the most widely used. The use of spectrally selective absorption film is an important measure to improve the heat collection efficiency of the collector, the working temperature and the cost performance of the system. An ide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D3/02C09D1/00C09D5/32
Inventor 陈若愚何梦瑶王红宁刘小华
Owner CHANGZHOU UNIV
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