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Method for preparing solar selective heat-absorbing paint

An endothermic paint, solar energy technology, applied in the direction of radiation-absorbing paints, coatings, etc., can solve the problems of unsatisfactory weather resistance of coatings, poor heat-absorbing properties of coatings, and large environmental pollution, and achieves the advantages of selective absorption, Low cost, high activity effect

Inactive Publication Date: 2010-05-12
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a solar energy selective heat-absorbing paint using nano-nickel powder / carbon nanotube composite as an absorbent to overcome the large environmental pollution and high investment of the existing method, and the heat-absorbing performance of the obtained paint Poor, unsatisfactory coating weather resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 0.01mol of nickel chloride and 0.5mmol of sodium lauryl sulfate into 100ml of ethanol at 50°C, stir well to dissolve, then drop into 100ml of sodium hydroxide solution (concentration 1M) at a rate of 30 drops / min. After the dropwise addition, the solution was continuously stirred at 50° C. for 30 minutes to obtain a uniform and stable colloidal solution. The prepared sodium borohydride solution was dripped into the colloidal solution at a rate of 20 drops / min and kept stirring. Bubbles were continuously generated in the solution and black precipitates were precipitated. After the bubbles disappeared, the obtained black precipitate was sequentially washed with ammonia water, deionized water and ethanol, and finally dried at a constant temperature in an oven at 80° C. for 12 hours to obtain nano nickel powder.

[0020] After mixing the nano-nickel powder of 8 mass parts, the carbon nanotube of 2 mass parts and the ethanol of 30 mass parts, stir vigorously and ultrason...

Embodiment 2

[0022] Put 0.1mol of nickel sulfate and 2mmol of polyethylene glycol into 1000ml of propylene glycol at 80°C, stir and dissolve thoroughly, then drop into 500ml of potassium hydroxide solution (concentration 1M) at a rate of 30 drops / min. Continue to stir the solution at 80°C for 60 minutes to obtain a uniform and stable colloidal solution. Drop the prepared hydrazine hydrate solution into the colloidal solution at a rate of 20 drops / min and keep ultrasonic oscillation, and the solution will continuously generate bubbles and black precipitates Precipitation. When the bubbles disappeared, the resulting black precipitate was washed sequentially with ammonia water, deionized water and ethanol, and finally dried at a constant temperature in a 60°C oven for 24 hours to obtain nano-nickel powder.

[0023] After mixing the nano-nickel powder of 20 mass parts, the carbon nanotube of 5 mass parts and the ethanol of 30 mass parts, vigorously stir and ultrasonically vibrate for 60 minutes...

Embodiment 3

[0025] Put 0.06mol of nickel acetate and 3mmol of polyvinylpyrrolidone into 600ml of ethylene glycol at 60°C, stir well to dissolve, then drop into 400ml of sodium hydroxide solution (concentration 1M) at a rate of 30 drops / min. After the dropwise addition, the solution was continuously stirred at 60° C. for 50 minutes to obtain a uniform and stable colloidal solution. The prepared potassium borohydride solution was dripped into the colloidal solution at a rate of 20 drops / min and kept stirring. Bubbles were continuously generated in the solution and black precipitates were precipitated. After the bubbles disappeared, the obtained black precipitate was sequentially washed with ammonia water, deionized water and ethanol, and finally dried at a constant temperature in a 90° C. oven for 8 hours to obtain nano-nickel powder.

[0026] After mixing the nano-nickel powder of 20 mass parts, the carbon nanotube of 8 mass parts and the ethanol of 42 mass parts, stir vigorously and ultra...

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Abstract

The invention relates to a method for preparing a solar selective heat-absorbing paint by taking nanometre nickel powder / carbon nano-tube composite as an absorbent, and belongs to the field of new material and new energy. The method is characterized by comprising the following steps: reacting a nickel salt, a dispersant, an alkali and a reducing agent to obtain the nanometre nickel powder with good dispersity; and mixing the nanometre nickel powder, the carbon nano-tube, a resin and a solvent in certain proportion to obtain the heat-absorbing coating containing nanometre nickel powder / carbon nano-tube composite. The method for preparing a solar selective heat-absorbing paint is simple, does not need complex devices, ensures even and stable dispersion of the nanometre nickel powder / carbon nano-tube composite, and can be used for preparing the solar selective heat-absorbing coating.

Description

Technical field: [0001] The invention relates to a method for preparing a solar energy selective heat-absorbing coating, in particular to a solar energy selective heat-absorbing agent using nano-nickel powder / carbon nanotubes as heat-absorbing agents that can be applied to solar vacuum tube heat collectors or flat plate heat collectors. Preparation method of heat-absorbing paint. Background technique: [0002] The heat collector in the solar heat collection system can convert the solar radiation energy into the heat energy of the working medium (liquid or gas). In order to improve the efficiency of solar thermal collectors, the most effective way is to minimize its convective and radiative heat losses while maintaining the maximum collection of solar energy. The use of high-quality selective absorption coating materials and high-transmittance cover materials is an important way to meet the above requirements. [0003] Selective absorption coatings, such as black nickel, bl...

Claims

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Application Information

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IPC IPC(8): C09D133/00C09D7/12C09D5/32
Inventor 黎阳谢华清
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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