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A structural color coating with daytime passive cooling function and its preparation method

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

Active Publication Date: 2022-06-21
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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  • A structural color coating with daytime passive cooling function and its preparation method
  • A structural color coating with daytime passive cooling function and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0049] The coating preparation process is as follows: According to SiO 2 : The mass ratio of PEMA monomer is 2:1, add it to the solvent containing surfactant, and then use a homogenizer to process for 30min to obtain a uniform emulsion. The surfactant in the emulsion is sodium dodecylbenzenesulfonate, and the quality is SiO 2 5 times; the solvent in the emulsion is acetone, accounting for 60% by volume. The emulsion was sonicated at 30 degrees for 30 minutes to initiate the polymerization of PEMA monomers and complete the conversion of SiO 2 the covering.

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

Embodiment 2

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

[0054] The coating preparation process is as follows: According to BaSO 4 : The mass ratio of PVB monomer is 2:1, add it to the solvent containing surfactant, and then use a homogenizer to process for 30min to obtain a uniform emulsion. The surfactant in the emulsion is sodium dodecylbenzene sulfonate, and the quality is BaSO 4 7 times; the solvent in the emulsion is ethanol, accounting for 70% by volume. The emulsion was sonicated at 30 degrees for 30 minutes to initiate the polymerization of PVB monomers and complete the treatment of BaSO 4 the covering.

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

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 500 nm, the average thickness of the coated PTFE high molecular polymer layer is 100 nm; the thickness of the coating is about 500 μm.

[0059] The coating preparation process is as follows: According to TiO 2 : The mass ratio of PTFE monomer is 1:1, add it to the solvent containing surfactant, and then use a homogenizer to process for 30min to obtain a uniform emulsion. The surfactant in the emulsion is sodium dodecylbenzenesulfonate, and the quality is TiO 2 10 times as much; 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 sonicated for 1 hour to initiate the polymerization of PTFE monomers and complete the conversion of TiO 2 the covering.

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

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Abstract

The invention belongs to the field of new building materials, and discloses a structural color coating with daytime passive cooling function. The coating is composed of a large number of core-shell structures composed of inorganic powder as the core and polymer as the shell. The microspheres are arranged periodically; the inorganic powder is set to have a reflectance in the solar spectrum band higher than 0.85, the polymer is set to have an emissivity in the mid-infrared band higher than 0.85, and the core-shell composite microspheres are periodic arrangement. The invention also discloses a corresponding preparation method. Through the present invention, the inorganic powder core ensures that the coating only absorbs very little solar energy, while the high molecular polymer shell ensures that the coating can continuously emit energy outward. This kind of inorganic powder inside and high molecular polymer outside The core-shell structure provides an excellent cooling effect; at the same time, the composite microspheres are periodically arranged and have the characteristics of a photonic band gap, so that the coating reflects visible light in different wavelength ranges in different directions, thus showing the desired structure color.

Description

technical field [0001] The invention belongs to the field of new building materials, and more particularly relates to a structural color coating with a passive cooling function during the day and a preparation method thereof. Background technique [0002] At present, the global temperature continues to rise, the global warming trend is becoming more and more obvious, and at the same time, the problem of energy crisis is becoming more and more serious. Existing building refrigeration technologies usually use a thermal cycle that compresses work, that is, air conditioning, to achieve refrigeration, but on the one hand, air conditioning and refrigeration consume a huge amount of energy. According to statistics, building refrigeration energy consumption has accounted for 20% of the global energy consumption- On the other hand, the large amount of fluorinated hydrocarbons emitted by air conditioning and refrigeration will cause serious damage to atmospheric ozone. These two aspec...

Claims

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Application Information

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