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Broad-spectrum solar absorbing coating and preparation method thereof

A technology of solar energy absorption and wide spectrum, which is applied in solar thermal power generation, solar thermal devices, heating devices, etc., to achieve the effects of good weather resistance, convenient operation and simple preparation process

Active Publication Date: 2012-08-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the application of reduced graphene oxide (RGO) to the solar spectrum absorption, and there is no report on the application of RGO in solar absorbing coatings.

Method used

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  • Broad-spectrum solar absorbing coating and preparation method thereof
  • Broad-spectrum solar absorbing coating and preparation method thereof
  • Broad-spectrum solar absorbing coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The copper sheet is polished (physical polishing or chemical polishing) to achieve a mirror effect. Since the infrared reflectivity of the mirror-polished copper sheet is very high, in order to simplify the manufacturing process, the mirror-polished copper sheet is directly used as the substrate. Doubles as an infrared reflective layer.

[0040] Select ethylene-vinyl acetate copolymer (EVA) with excellent processability and weather resistance, and reduced graphene oxide (RGO), use the brand of 150 ethylene-vinyl acetate copolymer produced by DuPont in the United States, and the mass percentage of vinyl acetate It is 32%, the melt index is 43g / 10min, and the density is 0.967g / cm 3 , the reduced graphene oxide (RGO) has a lamellar structure.

[0041]After the copper sheet is polished into a mirror surface, 10 g of ethylene-vinyl acetate copolymer is dissolved in 86.6 g (i.e. 100 ml) of toluene to obtain an ethylene-vinyl acetate copolymer toluene solution, and 1.2 g of e...

Embodiment 2

[0045] The copper sheet is polished (physical polishing or chemical polishing) to achieve a mirror effect. Since the infrared reflectivity of the mirror-polished copper sheet is very high, in order to simplify the manufacturing process, the mirror-polished copper sheet is directly used as the substrate Doubles as an infrared reflective layer.

[0046] Select ethylene-vinyl acetate copolymer (EVA) with excellent processability and weather resistance, and reduced graphene oxide (RGO), use the brand of 150 ethylene-vinyl acetate copolymer produced by DuPont in the United States, and the mass percentage of vinyl acetate It is 32%, the melt index is 43g / 10min, and the density is 0.967g / cm 3 , the reduced graphene oxide (RGO) has a lamellar structure.

[0047] After the copper sheet is polished into a mirror surface, 1.2g of reduced graphene oxide is added to 10g of ethylene-vinyl acetate copolymer melt that has been heated and melted (the temperature of heating and melting is 130°...

Embodiment 3

[0051] The copper sheet is polished (physical polishing or chemical polishing) to achieve a mirror effect. Since the infrared reflectivity of the mirror-polished copper sheet is very high, in order to simplify the manufacturing process, the mirror-polished copper sheet is directly used as the substrate Doubles as an infrared reflective layer.

[0052] Select ethylene-vinyl acetate copolymer (EVA) with excellent processability and weather resistance, and reduced graphene oxide (RGO), use the brand of 150 ethylene-vinyl acetate copolymer produced by DuPont in the United States, and the mass percentage of vinyl acetate It is 32%, the melt index is 43g / 10min, and the density is 0.967g / cm 3 , the reduced graphene oxide (RGO) has a lamellar structure.

[0053] After the copper sheet is polished into a mirror surface, 1.2g of reduced graphene oxide and 10g of ethylene-vinyl acetate copolymer are added to a closed mixer at 95°C for 4 minutes to produce a blank plastic, and then the b...

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Abstract

The invention discloses a broad-spectrum solar absorbing coating comprising an infrared reflection layer and an absorbing layer covering the infrared reflection layer, wherein the infrared reflection layer is a base which is processed into a mirror surface; the absorbing layer is composed of the following components in percentage by weight: 5-20% of reduced graphene oxide and 80-95% of ethylene-vinyl acetate copolymer. The broad-spectrum solar absorbing coating has the advantages of high absorbing rate, relatively good heat stability, good wear resistance and the like, and is particularly suitable for a solar photo-thermal conversion system and is good for market-based popularization and application. The invention further discloses a preparation method of the broad-spectrum solar absorbing coating, comprising the following steps of: after machining the base into the mirror surface, utilizing the reduced graphene oxide and the ethylene-vinyl acetate copolymer to prepare an absorbing layer by utilizing a solvent membrane casting method or a fusion pressing method, so as to obtain the broad-spectrum solar absorbing coating. The method has the advantages of simple preparation process,convenience for operation and easiness of controlling, and can obviously reduce the production cost.

Description

technical field [0001] The invention relates to the field of solar energy absorbing coatings and preparation thereof, in particular to a reduced graphene oxide (RGO) and ethylene-vinyl acetate copolymer (EVA) low-temperature wide-spectrum solar absorbing coating and a preparation method thereof, belonging to solar thermal Take advantage of technical areas. Background technique [0002] With the increasingly severe energy and environmental problems, the utilization of solar energy has become a research hotspot of governments in various countries. Among them, the solar thermal conversion is one of the most promising ways of application feasibility and prospects in solar energy utilization. There are two main forms of solar energy utilization. : Light-electricity, that is, solar cells; light-heat, direct use of solar heat radiation. Solar absorbing coatings have good absorption characteristics in the solar spectrum range and are functional films that directly convert solar ene...

Claims

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Application Information

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IPC IPC(8): F24J2/48C03C17/23C03C17/32
CPCY02E10/40
Inventor 吴亮曹鸿涛孙旭平刘志敏孙喜莲梁凌燕
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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