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Preparation method of metal-dielectric solar spectral selective absorbing coating

A technology for absorbing coating and solar energy, which is applied in the field of preparation of solar spectrum selective absorbing coating, can solve the problem that the dispersion degree of absorbing particles cannot meet the requirements, etc., and achieves easy control of chemical composition and thickness, uncomplicated equipment and simple process Effect

Inactive Publication Date: 2010-07-07
QINGDAO BRANCH NO 53 INST OF CHINA NORTH IND GRP
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Problems solved by technology

[0005] The purpose of the present invention is to provide a novel method for preparing a metal-medium-type spectrally selective absorbing coating in order to solve the problem that the dispersion degree of absorbing particles in the process of preparing the coating by the existing sol-gel method cannot meet the requirements.

Method used

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no. 1 Embodiment

[0019] The first specific embodiment of the present invention, Ni / SiO 2 Preparation of Spectrally Selective Absorbing Coatings

[0020] 7.5mL ethyl silicate, 72g Ni(NO 3 ) 2 ·6H 2 O and 1g of film-forming accelerator polyvinylpyrrolidone were dissolved in 250mL of ethanol, stirred at room temperature for 1 hour to make Ni(NO 3 ) 2 ·6H 2 O was completely dissolved, and 5 mL of 0.5 M hydrochloric acid was added, and the stirring was continued for 1 hour to obtain a composite sol containing nickel ions. The sol film was prepared on the pre-cleaned aluminum sheet by spin coating method, and the sol film was dried in the air at room temperature for 24 hours, and then heated at a rate of 2 °C / min under N 2 heated to 400°C in gas, and in H 2 and N 2 It was kept in the mixed gas for 1 hour, and finally cooled naturally in a furnace to room temperature to obtain a black absorbing coating with a visible light absorption rate of 92%.

no. 2 Embodiment

[0021] The second specific embodiment of the present invention, NiCu / Al 2 o 3 Preparation of Spectrally Selective Absorbing Coatings

[0022] Add 4g of aluminum isopropoxide and 1.5g of complexing agent ethyl acetoacetate to 80mL of water, hydrolyze at 85°C for half an hour, add 6mL of 1M nitric acid, keep at constant temperature for 2.5 hours, raise the temperature to 90°C and age for 7 hours to obtain aluminum sol. 20g Ni(NO 3 ) 2 ·6H 2 O, 3g Cu(NO 3 ) 2 ·6H 2 O and 0.5g film-forming accelerator polyethylene glycol were added to the aluminum sol, and stirred for half an hour to make Ni(NO 3 ) 2 ·6H 2 O, Cu(NO 3 ) 2 ·6H 2 O and the film-forming accelerator are fully dissolved to prepare a composite sol containing nickel ions and copper ions. The sol film was prepared on the aluminum sheet by the dipping-pulling method, and the sol film was dried in the air at room temperature for 24 hours, and then heated at a rate of 5 °C / min under N 2 heated to 500°C in gas, a...

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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 [0001] The invention relates to a method for preparing a coating, in particular to a method for preparing a solar spectrum selective absorption coating composed of a metal-medium composite material with light-to-heat conversion function. Background technique [0002] The deterioration of the human living environment and the increasing shortage of energy are two major problems facing the world today. The use of new renewable energy is the fundamental way to solve the above problems. Among them, solar energy is clean, inexhaustible and inexhaustible. Become the first choice for new energy. Solar spectrum selective absorption coating is a key technology in solar thermal utilization. [0003] The preparation methods of solar spectrum selective absorption coatings include coating method, electrochemical deposition method, vapor deposition method (physical vapor deposition and chemical vapor deposition) and vacuum coating method (vacuum evaporation and sputtering ...

Claims

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Application Information

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IPC IPC(8): B05D1/18B05D7/24B05D3/10B05D3/00C09D1/00C09D5/32
Inventor 邱桂花于名讯姜兴三赵均英刘永峙王存安
Owner QINGDAO BRANCH NO 53 INST OF CHINA NORTH IND GRP
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