CN101767081A - Preparation method of metal-dielectric solar spectral selective absorbing coating - Google Patents
Preparation method of metal-dielectric solar spectral selective absorbing coating Download PDFInfo
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- CN101767081A CN101767081A CN200810192950A CN200810192950A CN101767081A CN 101767081 A CN101767081 A CN 101767081A CN 200810192950 A CN200810192950 A CN 200810192950A CN 200810192950 A CN200810192950 A CN 200810192950A CN 101767081 A CN101767081 A CN 101767081A
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- selective absorbing
- absorbing coating
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Abstract
The invention relates to a preparation method of a metal-dielectric solar spectral selective absorbing coating, which comprises the following steps: (1) preparing compound sol of metal material and dielectric material; (2) preparing a sol film by coating the prepared sol on a metal substrate through an impregnating-pulling method, a spin coating method or a spray coating method; and (3) drying the sol film at room temperature, then carrying out heat treatment on the sol film at the temperature of 300-600 DEG C, reducing the sol film by using hydrogen gas and cooling the sol film along with a furnace to obtain the metal-dielectric solar spectral selective absorbing coating with a photothermal conversion function. Since the sol is prepared by dissolving precursors of the metal and dielectric materials, the method can ensure that two molecules are evenly mixed in the molecular level, and chemical components and the thickness of the prepared coating are easy to control as well as solves the problem that absorbing particles are evenly dispersed, so that the light absorbing effect is better. In addition, the method has the advantages of simple process, low cost, easy industrialization and uncomplicated equipment.
Description
Technical field
The present invention relates to a kind of coating production, specifically, relate to a kind of preparation method with solar spectral selective absorbing coating that constitutes by the metal-dielectric composite of photo-thermal transformation function.
Background technology
The deterioration of environment for human survival and the worsening shortages of the energy are two significant problems that the world today faces, utilizing novel renewable energy is the basic outlet that addresses the above problem, and wherein solar energy is owing to its cleaning, inexhaustible, nexhaustible advantage become the first-selection of new forms of energy.Solar spectral selective absorbing coating is the key technology in the solar thermal utilization.
The preparation method of solar spectral selective absorbing coating has the coating method, electrochemical deposition method, vapour deposition process (physical vapour deposition (PVD) and chemical vapour deposition (CVD)) and Vacuum Coating method (vacuum evaporation and sputtering sedimentation) etc.The coating legal system is equipped with that the coating cost is lower, and process equipment is simple, and anti-environment capacity is strong, good reproducibility is realized mechanization production easily, but coating layer thickness is generally all more than several microns, infrared emittance is very big, and because the heat-resisting quantity of resin is relatively poor, is difficult to prepare the high-temperature selective absorber coatings.Electrochemical deposition method technology is simple, and can prepare the good coating of selectivity, but has problem of environmental pollution, and the coating corrosion-resistant of preparation.Vacuum Coating method is prevailing in the market technology of preparing, can obtain satisfied coating for selective absorption by the control process conditions, but filming equipment complexity, process conditions harshness, cost height.
Sol-gel process prepares the temperature of coating without any need for vacuum condition and Tai Gao, has environmental protection, film forming is even, can large tracts of land implement, cost is low, and the cycle is short and be easy to advantage such as suitability for industrialized production, and coating chemical composition ratio is easier to control, coating layer thickness is adjustable to micron order in nanometer, is fit to preparation multicomponent coating material.U.S. Pat 5912045 is dispersed in Al with the conductivity type absorbing particle of 5～30nm
2O
3, SiO
2, ZrO
2In the isosol, colloidal sol is filmed then, prepares required absorber coatings.Because the light absorption particle prepares in advance, how making absorbing particle reach required degree of scatter is the key issue that needs solution, and this preparation technology can not embody sol-gel process can be in the advantage of molecular level mixed material.
Summary of the invention
The objective of the invention is to prepare the deficiency that the absorbing particle degree of scatter that exists in the coating procedure can not meet the demands, the preparation method of a kind of new type of metal-medium type spectral selective absorbing coating is provided at existing sol-gel process.
Technical scheme of the present invention is: a kind of preparation method of metal-dielectric solar spectral selective absorbing coating may further comprise the steps:
(1) complex sol of preparation metal material and dielectric material;
(2) complex sol that makes is coated on the metal base preparation dissolved glue film with dipping-pulling method, spin-coating method or spraying process;
(3) dissolved glue film is at room temperature dry, 300 ℃ then～600 ℃ heat treatments, and use hydrogen reducing, with the metal-dielectric solar spectral selective absorbing coating that obtains the photo-thermal translation function after the stove cooling.
Preferably, during described preparation complex sol, be that the predecessor with metal material and dielectric material is dissolved in the solvent, add coalescents, fully mix stir, dissolving, form complex sol.
Preferably, during the preparation complex sol, the predecessor with dielectric material is dissolved in the solvent earlier, adds film forming accelerating, prepares dielectric material colloidal sol, adds the predecessor of metal material then, fully stirs, and dissolving forms complex sol; Perhaps the predecessor with metal material and dielectric material is dissolved in the solvent together, adds film forming accelerating, forms complex sol.
Preferably, described metal material is any one or any two kinds or any three kinds in nickel, copper, gold, the palladium.
Preferably, described dielectric material is any one or any two kinds in magnesia, titanium dioxide, silica and the alundum (Al.
Preferably, the predecessor of described metal material is the metal alkoxide or the inorganic salts of cupric, gold, nickel, palladium.
Preferably, the predecessor of described dielectric material is metal alkoxide or the inorganic salts that contain magnesium, titanium, silicon, aluminium.
Preferably, described film forming accelerating is polyvinylpyrrolidone and polyethylene glycol.
Preferably, described solvent is water or ethanol.
Beneficial effect of the present invention is: because this method is to utilize the predecessor dissolving of metal and dielectric material to form colloidal sol, therefore can guarantee that two kinds of components mix at molecular level, the chemical composition of the coating of preparation and thickness are easy to control, solved absorbing particle and disperseed uneven problem, optical absorption is better.This method technology is simple in addition, cost is low, be easy to industrialization, equipment needed thereby is uncomplicated.
The specific embodiment
First specific embodiment of the present invention, Ni/SiO
2The preparation of spectral selective absorbing coating
7.5mL silester, 72g Ni (NO
3)
26H
2O and 1g film forming accelerating polyvinylpyrrolidone are dissolved in the 250mL ethanol, stir under the room temperature to make Ni (NO in 1 hour
3)
26H
2O dissolves fully, adds 5mL 0.5M hydrochloric acid, continues to stir 1 hour, makes the complex sol that contains nickel ion.On the aluminium flake that cleaned in advance, prepare dissolved glue film with spin-coating method, dissolved glue film dry 24 hours in air at room temperature, then with the heating rate of 2 ℃/min at N
2Be heated to 400 ℃ in the gas, and at H
2And N
2Insulation is 1 hour in the mist, naturally cools to room temperature at last in stove, obtains the absorber coatings of black, its visible-light absorptivity 92%.
Second specific embodiment of the present invention, NiCu/Al
2O
3The preparation of spectral selective absorbing coating
4g aluminium isopropoxide and 1.5g complexing agent ethyl acetoacetate add in the 80mL water, add 6mL1M nitric acid after 85 ℃ of hydrolysis half an hour, continue to keep constant temperature 2.5 hours, be warming up to 90 ℃ aging 7 hours, make aluminium colloidal sol.With 20g Ni (NO
3)
26H
2O, 3g Cu (NO
3)
26H
2O and 0.5g film forming accelerating polyethylene glycol add in the aluminium colloidal sol, stir half an hour, make Ni (NO
3)
26H
2O, Cu (NO
3)
26H
2O and film forming accelerating are fully dissolved, and make the complex sol that contains nickel ion and copper ion.On aluminium flake, prepare dissolved glue film with dipping-pulling method, dissolved glue film dry 24 hours in air at room temperature, then with the heating rate of 5 ℃/min at N
2Be heated to 500 ℃ in the gas, and at H
2And N
2Insulation is 1.5 hours in the mist, naturally cools to room temperature at last in stove, obtains the absorber coatings of black.
Claims (10)
1. the preparation method of a metal-dielectric solar spectral selective absorbing coating is characterized in that may further comprise the steps:
(1) complex sol of preparation metal material and dielectric material;
(2) complex sol that makes is coated on the metal base preparation dissolved glue film with dipping-pulling method, spin-coating method or spraying process;
(3) dissolved glue film is at room temperature dry, 300 ℃ then～600 ℃ heat treatments, and use hydrogen reducing, with the metal-dielectric solar spectral selective absorbing coating that obtains having the photo-thermal translation function after the stove cooling.
2. the preparation method of metal-dielectric solar spectral selective absorbing coating according to claim 1, it is characterized in that: during described preparation complex sol, be that predecessor with metal material and dielectric material is dissolved in the solvent, add coalescents, fully mix and stir, dissolve, form complex sol.
3. the preparation method of metal-dielectric solar spectral selective absorbing coating according to claim 2, it is characterized in that: during the preparation complex sol, predecessor with dielectric material is dissolved in the solvent earlier, add film forming accelerating, prepare dielectric material colloidal sol, add the predecessor of metal material then, fully stir, dissolving forms complex sol.
4. the preparation method of metal-dielectric solar spectral selective absorbing coating according to claim 2, it is characterized in that: during the preparation complex sol, the predecessor of metal material and dielectric material is dissolved in the solvent together, adds film forming accelerating, form complex sol.
5. the preparation method of metal-dielectric solar spectral selective absorbing coating according to claim 1 is characterized in that: described metal material is any one or any two kinds or any three kinds in nickel, copper, gold, the palladium.
6. the preparation method of metal-dielectric solar spectral selective absorbing coating according to claim 1 is characterized in that: described dielectric material is any one or any two kinds in magnesia, titanium dioxide, silica and the alundum (Al.
7. according to the preparation method of any described metal-dielectric solar spectral selective absorbing coating of claim 2 to 4, it is characterized in that: the predecessor of described metal material is the metal alkoxide or the inorganic salts of cupric, gold, nickel, palladium.
8. according to the preparation method of any described metal-dielectric solar spectral selective absorbing coating of claim 2 to 4, it is characterized in that: the predecessor of described dielectric material is metal alkoxide or the inorganic salts that contain magnesium, titanium, silicon, aluminium.
9. according to the preparation method of any described metal-dielectric solar spectral selective absorbing coating of claim 2 to 4, it is characterized in that: described film forming accelerating is polyvinylpyrrolidone and polyethylene glycol.
10. according to the preparation method of any described metal-dielectric solar spectral selective absorbing coating of claim 2 to 4, it is characterized in that: described solvent is water or ethanol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810192950A CN101767081A (en) | 2008-12-31 | 2008-12-31 | Preparation method of metal-dielectric solar spectral selective absorbing coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810192950A CN101767081A (en) | 2008-12-31 | 2008-12-31 | Preparation method of metal-dielectric solar spectral selective absorbing coating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962770A (en) * | 2010-11-03 | 2011-02-02 | 武汉理工大学 | Intermediate and high temperature solar energy selective absorbing coating and preparation method thereof |
| CN102093767A (en) * | 2010-12-02 | 2011-06-15 | 无锡中阳新能源科技有限公司 | Medium and high temperature solar selective absorption coating and coating layer and preparation method thereof |
| CN102268673A (en) * | 2011-06-07 | 2011-12-07 | 广东联塑科技实业有限公司 | Method for preparing selective absorption coating of plastic solar thermal collector |
| CN109354929A (en) * | 2018-08-30 | 2019-02-19 | 江苏京展能源科技有限公司 | A kind of preparation method of selective solar spectrum composite coating for absorbing |
-
2008
- 2008-12-31 CN CN200810192950A patent/CN101767081A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962770A (en) * | 2010-11-03 | 2011-02-02 | 武汉理工大学 | Intermediate and high temperature solar energy selective absorbing coating and preparation method thereof |
| CN102093767A (en) * | 2010-12-02 | 2011-06-15 | 无锡中阳新能源科技有限公司 | Medium and high temperature solar selective absorption coating and coating layer and preparation method thereof |
| CN102093767B (en) * | 2010-12-02 | 2013-10-16 | 无锡中阳新能源科技有限公司 | Medium and high temperature solar selective absorption coating and coating layer and preparation method thereof |
| CN102268673A (en) * | 2011-06-07 | 2011-12-07 | 广东联塑科技实业有限公司 | Method for preparing selective absorption coating of plastic solar thermal collector |
| CN102268673B (en) * | 2011-06-07 | 2014-10-29 | 广东联塑科技实业有限公司 | Method for preparing selective absorption coating of plastic solar thermal collector |
| CN109354929A (en) * | 2018-08-30 | 2019-02-19 | 江苏京展能源科技有限公司 | A kind of preparation method of selective solar spectrum composite coating for absorbing |
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Application publication date: 20100707 |