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Structural color coating with daytime passive refrigeration function and preparation method thereof

A passive cooling, structural color technology, applied in coatings, reflective/signal coatings, etc., can solve the problems of the functional impact of radiation cooling coatings, large coatings, etc., to achieve excellent cooling effect, easy operation, and strong applicability. Effect

Active Publication Date: 2021-06-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, although color coatings can be prepared by simply adding color pigments, this will inevitably cause the coating to absorb a large amount of energy in the visible light band, which will greatly affect the functionality of the radiation cooling coating.

Method used

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  • Structural color coating with daytime passive refrigeration function and preparation method thereof
  • Structural color coating with daytime passive refrigeration function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The coating described in this example consists of PEMA coated SiO 2 The core-shell structure composite microspheres are periodically arranged. Among them, SiO 2 The average diameter of the core is 250nm, the average thickness of the coated PEMA polymer layer is 30nm; the thickness of the coating is about 500μm.

[0049] The coating preparation process is as follows: according to SiO 2 : The mass ratio of PEMA monomer is 2: 1, it is added in the solvent containing surfactant, and then it is treated with a homogenizer for 30 minutes to obtain a uniform emulsion. The surfactant in the emulsion is sodium dodecylbenzenesulfonate, and the mass is SiO 2 5 times; the solvent in the emulsion is acetone, accounting for 60% by volume. The emulsion was sonicated at 30°C for 30 minutes to initiate PEMA monomer polymerization and complete the SiO 2 of wrapping.

[0050] A dispersant is added to the above emulsion to form a dispersion. The dispersant in the dispersion liquid is...

Embodiment 2

[0053] The coating described in this example consists of PVB coated BaSO 4 The core-shell structure composite microspheres are periodically arranged. Among them, BaSO 4 The average diameter of the core is 400nm, the average thickness of the coated PVB polymer layer is 30nm; the coating thickness is about 500μm.

[0054] The coating preparation process is as follows: according to BaSO 4 : The mass ratio of PVB monomer is 2: 1, it is added in the solvent that contains surfactant, then adopt homogenizer to process 30min to obtain uniform emulsion. The surfactant in the emulsion is sodium dodecylbenzenesulfonate, and the mass is BaSO 4 7 times of that; the solvent in the emulsion is ethanol, accounting for 70% by volume. The emulsion was ultrasonically treated at 30 degrees for 30 minutes to initiate the polymerization of PVB monomer and complete the reaction of BaSO 4 of wrapping.

[0055] A dispersant is added to the above emulsion to form a dispersion. The dispersant in ...

Embodiment 3

[0058] The coating described in this example consists of PTFE coated TiO 2 The core-shell structure composite microspheres are periodically arranged. Among them, TiO 2 The average diameter of the core is 500nm, the average thickness of the coated PTFE polymer layer is 100nm; the thickness of the coating is about 500μm.

[0059] The coating preparation process is as follows: according to TiO 2 : The mass ratio of PTFE monomer is 1:1, it is added in the solvent containing surfactant, and then it is treated with a homogenizer for 30 minutes to obtain a uniform emulsion. The surfactant in the emulsion is sodium dodecylbenzenesulfonate, and the mass is TiO 2 10 times; the solvent in the emulsion is 50% water and 50% ethanol, and the volume fraction is 40%. The emulsion was heated to 60 degrees and ultrasonically treated for 1 hour to initiate the polymerization of PTFE monomer and complete the reaction of TiO 2 of wrapping.

[0060] A dispersant is added to the above emulsion...

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Abstract

The invention belongs to the field of new building materials, and discloses a structural color coating with a daytime passive refrigeration function, which is formed by periodically arranging a large number of core-shell structure composite microspheres with inorganic powder as a core and a high-molecular polymer as a shell, wherein the solar spectrum wave band reflectivity of the inorganic powder is set to be higher than 0.85, the middle infrared wave band emissivity of the high-molecular polymer is set to be higher than 0.85, and the core-shell structure composite microspheres are periodically arranged. The invention further discloses a corresponding preparation method. According to the invention, the inorganic powder core ensures that the coating only absorbs little sunlight energy, the high-molecular polymer shell ensures that the coating can continuously emit energy outwards, and the core-shell structure with the inorganic powder inside and the high-molecular polymer outside provides an excellent refrigeration effect; and meanwhile, the composite microspheres are periodically arranged and have the characteristic of a photonic band gap, so that the coating reflects visible light in different wavelength ranges in different directions, and the required structural color is displayed.

Description

technical field [0001] The invention belongs to the field of new building materials, and more specifically relates to a structural color coating with daytime passive cooling function and a preparation method thereof. Background technique [0002] At present, the global temperature continues to rise, and the trend of global warming is becoming more and more significant. At the same time, the energy crisis is becoming more and more serious. Existing cooling technologies for buildings usually use air-conditioning, which is a heat cycle that compresses work, to achieve cooling. However, on the one hand, air-conditioning and cooling consume huge energy. According to statistics, building cooling energy consumption has accounted for 20% of global energy consumption- 50%. On the other hand, a large amount of fluorine-containing hydrocarbons emitted by air-conditioning and refrigeration will cause serious damage to atmospheric ozone. These two aspects will lead to further aggravation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/33C09D151/10
CPCC09D5/004C09D151/10
Inventor 刘沛段将将周军
Owner HUAZHONG UNIV OF SCI & TECH