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Solar light absorption coating and preparation method thereof

A technology of light-absorbing coating and solar energy, applied in the field of solar heat collecting materials, can solve the problems of unsuitable coating and high preparation cost, and achieve the effects of reducing preparation difficulty, convenient and simple process, and good high temperature resistance

Pending Publication Date: 2021-02-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose: In order to overcome the problems in the prior art that the preparation cost is high and it is not suitable for preparing coatings on complex surfaces, the present invention provides a solar light-absorbing coating and its preparation method

Method used

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  • Solar light absorption coating and preparation method thereof
  • Solar light absorption coating and preparation method thereof
  • Solar light absorption coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Weigh Co(NO 3 ) 2 ·6H 2 O crystal 5.82 g, Ni(NO 3 ) 2 ·6H 2 O crystal 2.62 g, Fe(NO 3 ) 3 9H 2 O crystal 0.40 g, put the three crystals into a 250 mL beaker, add 100 mL of absolute ethanol and stir thoroughly until the crystals are completely dissolved, and place the mixed solution in a 70 °C water bath to volatilize until only 10 mL remains;

[0023] 2) Take 3 g of the sol obtained after volatilization in a beaker, add 0.5 g of polyethylene glycol-400, and transfer the mixed solution to the spray gun after fully stirring, adjust the spray gun pressure to 0.4 MPa, the spraying angle to 90°, and the spraying speed to 0.15 m / s, spray the mixed solution on the polished 304 stainless steel substrate, and the number of sprayed layers is 2 layers;

[0024] 3) Put the sprayed sample in a 70 °C oven for 30 min, take it out, transfer it to a muffle furnace, set the heating rate at 5 °C / min, heat it up to 500 °C for 1 h, and then cool it to room temperature with the fu...

Embodiment 2

[0028] 1) Weigh Co(NO 3 ) 2 ·6H 2 O crystal 11.64 g, Ni(NO 3 ) 2 ·6H 2 O crystal 5.24 g, Fe(NO 3 ) 3 9H 2 O crystal 0.80 g, put the three crystals into a 250 mL beaker, add 150 mL of absolute ethanol and stir thoroughly until the crystals are completely dissolved, then place the mixed solution in a water bath at 75 °C to evaporate until only 24 mL remains;

[0029] 2) Take 3 g of the sol obtained after volatilization in a beaker, add 0.6 g of polyethylene glycol-400, and transfer the mixed solution to the spray gun after fully stirring. 0.15 m / s, spray the mixed solution on the polished 304 stainless steel substrate, and the number of sprayed layers is 2 layers;

[0030] 3) Put the sprayed sample in a 70 °C oven for 30 min, take it out, transfer it to a muffle furnace, set the heating rate at 5 °C / min, heat it up to 500 °C for 1 h, and then cool it to room temperature with the furnace Then take it out.

[0031] The emissivity performance of the coating prepared in th...

Embodiment 3

[0034] 1) Weigh Co(NO 3 ) 2 ·6H 2 O crystal 5.82 g, Ni(NO 3 ) 2 ·6H 2 O crystal 2.62 g, Fe(NO 3 ) 3 9H 2 O crystal 0.40 g, put the three kinds of crystals into a 250 mL beaker, add 100 mL of absolute ethanol and stir thoroughly until the crystals are completely dissolved, and place the mixed solution in a 70 °C water bath to volatilize until only 15 mL remains;

[0035] 2) Take 3 g of the sol obtained after volatilization in a beaker, add 0.5 g of polyethylene glycol-400, and transfer the mixed solution to the spray gun after fully stirring, adjust the spray gun pressure to 0.4 MPa, the spraying angle to 90°, and the spraying speed to 0.15 m / s, spray the mixed solution on the polished 304 stainless steel substrate, and the number of sprayed layers is 3 layers;

[0036] 3) Put the sprayed sample in a 70 °C oven for 30 min, take it out, transfer it to a muffle furnace, set the heating rate at 5 °C / min, heat it up to 500 °C for 1 h, and then cool it to room temperature wi...

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Abstract

The invention discloses a preparation method of a solar light absorption coating. The method comprises the following steps of mixing Fe(NO3)3, Ni(NO3)2 and Co(NO3)2, dissolving in absolute ethyl alcohol, and performing stirring at constant temperature of 70 DEG C to prepare sol; adding polyethylene glycol-400 into the sol, and then spraying the sol to the surface of a polished substrate through aspray gun; and drying the surface film layer of the substrate at 70 DEG C, putting the substrate into a muffle furnace, heating to 500 DEG C at a speed of 5 DEG C / min, keeping the temperature for 1 hour, calcining, and cooling to room temperature along with the furnace to form the solar light absorption coating. The preparation method provided by the invention is convenient and simple in process,has no special requirements on the surface of the substrate, can be applied to a complex surface, further saves the preparation cost and reduces the preparation difficulty; and the prepared light absorption coating has good high temperature resistance, and still keeps good absorbance after continuously working at 500 DEG C for 24 hours.

Description

technical field [0001] The invention relates to a solar light-absorbing coating and a preparation method thereof, belonging to the technical field of solar heat-collecting materials. Background technique [0002] Since the last century, with the rapid development of global industry, people's demand for green energy has become more and more urgent, and it has become an important task to find new green energy sources. As an important renewable energy, solar energy not only has a huge reserve, but also is widely distributed, so it has become a key research object. Photothermal conversion is an important form of utilizing solar energy, that is, the sun's radiant energy is collected and absorbed through a heat collection system, and converted into heat energy for use. At present, most of the solar heat collecting elements used in the market are prepared by magnetron sputtering method. The area prepared by a single operation is limited and the preparation cost is expensive, so it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/06B05D7/14B05D7/24
CPCB05D5/06B05D7/14B05D7/24B05D2202/15
Inventor 谭淑娟杨芷炎李永超张毅
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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