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Preparation method of solar energy heat absorbing coating using nickel or nickel alloy hollow ball as absorbent

A technology of solar energy absorption and nickel alloy, which is applied in the direction of radiation-absorbing coatings, coatings, polyester coatings, etc., can solve the problems of no relevant reports, etc., and achieve the effect of simple process operation and simple equipment

Inactive Publication Date: 2008-10-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no relevant report at home and abroad on the preparation of this solar heat absorbing coating using nickel or nickel alloy hollow spheres as the absorber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Nickel sulfate, sodium hypophosphite, sodium hydroxide are mixed with deionized water respectively into nickel sulfate solution of 260g / L, sodium hypophosphite solution of 320g / L and sodium hydroxide alkali solution of 15g / L, three kinds of solutions Take 1 liter each, put it into a 90°C constant temperature water bath and heat it for 8 minutes, and add 5ml of 20g / L citric acid solution, 2ml of lactic acid, and 3ml of 10g / L thiourea to the nickel sulfate solution. Then pour sodium hydroxide into the nickel sulfate solution to obtain uniform nickel hydroxide colloid. Pour the sodium hypophosphite solution into the nickel hydroxide colloid again, while stirring continuously, then the reaction occurs, a large number of bubbles emerge, the reaction proceeds violently, a large amount of black precipitate appears in the solution, and the reaction is completed when there are no more bubbles in the solution. Filter the resulting black precipitate, wash it with ammonia water, de...

Embodiment 2

[0029] Mix nickel nitrate, hydrazine hydrate, and sodium hydroxide with deionized water to make 150g / L nickel nitrate solution, 70g / L hydrazine hydrate solution, and 20g / L sodium hydroxide alkali solution, and take 1 liter of each of the three solutions , while heating in a constant temperature water bath at 55°C for 5 minutes, and then pour sodium hydroxide into the nickel sulfate solution to obtain a uniform nickel hydroxide colloid. Then pour the hydrazine hydrate solution into the nickel hydroxide colloid, and keep stirring at the same time, then the reaction occurs, a large number of bubbles emerge, the reaction proceeds vigorously, a large amount of black precipitate appears in the solution, and the reaction is completed when no more bubbles are generated in the solution. The obtained black precipitate was filtered, washed with ammonia water, deionized water and acetone respectively, and dried in an oven at 60°C for 20 hours. The obtained powder was hollow nickel powder w...

Embodiment 3

[0035] 200g of nickel sulfate and 20g of cobalt sulfate are prepared into 1L of composite metal salt solution, hydrazine hydrate and sodium hydroxide are prepared into solutions of 100g / L and 12g / L respectively, and 1 liter of each of the three solutions is put into 50 ℃ in a constant temperature water bath and heated for 7 minutes, and added 6 ml of lactic acid, 2 ml of succinic acid, and 2 ml of ammonium molybdate of 8 g / L to the composite metal salt solution. Then sodium hydroxide is poured into the composite metal salt solution to obtain a uniform hydroxide colloid, and then the hydrazine hydrate solution is poured into the colloid solution, and a large amount of brown-black precipitates appear in the solution, and the resulting precipitates are filtered through ammonia water, and then removed. Wash with ionized water and acetone, and dry in an oven at 90°C for 1.5 hours. The obtained powder is a nickel-cobalt alloy hollow sphere with a cobalt content of 8.0% and a particle...

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Abstract

The invention relates to a method for making a solar endothermic coating by using a nickel or nickel alloy hollow sphere as an absorbent. The method comprises the following steps that: firstly nickel or nickel alloy hollow sphere powder made by autocatalytic reduction, resin and solvent are mixed according to a certain proportion to obtain an even paint; secondly, the paint is evenly coated on a substrate with a glazed surface by a spray finishing method to form a coating with even thickness; finally, the coating is kept warm and dried under a certain temperature, thereby obtaining the solar an endothermic coating. The method for making the solar endothermic coating by using the nickel or nickel alloy hollow sphere as the absorbent adopts simple equipment and simple and feasible process; the prepared solar endothermic coating is a metal-resin type composite coating; the absorbent is nickel or nickel alloy powder with a hollow structure; a filling agent is made of macromolecule resin; the thickness of the coating is controlled between 10 and 100 mu m; the color of the coating is gray-black or black. Through choosing the nickel or nickel alloy powder with different grain diameters and components as the absorbent, the solar endothermic coating with absorptivity between 0.96 and 0.98 can be prepared.

Description

technical field [0001] The invention relates to a preparation method of a novel solar heat absorbing coating, in particular to a preparation method of a solar heat absorbing coating using nickel or nickel alloy hollow spheres as absorbents. Background technique [0002] Solar energy is an inexhaustible clean energy. However, due to its low energy density after reaching the earth, it brings difficulties to large-scale development and utilization, which determines that solar energy can be directly used in daily life and before industrial production. , must increase the energy density of solar energy. The solar selective absorbing coating has a high absorption rate of visible light, but its own infrared radiation rate is very low, which can convert low-grade solar energy into high-grade thermal energy and enrich solar energy, which is the key to solar thermal utilization technology, which is crucial to improving collector efficiency. [0003] Since the idea of ​​solar selecti...

Claims

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Application Information

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IPC IPC(8): C09D5/32C09D7/12C09D163/00C09D133/00C09D167/00C09C1/62B22F9/24
Inventor 邓意达李志彬沈彬刘磊仵亚婷胡文彬
Owner SHANGHAI JIAO TONG UNIV
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