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Colored radiation refrigeration film and preparation method thereof

A technology of radiation cooling and film, applied in the field of color radiation cooling film and its preparation, which can solve the problems such as the decline of cooling performance of radiation cooling materials, limitation of radiation cooling materials, complicated preparation process, etc., and achieve long-lasting color, low cost and simple preparation process Effect

Active Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the radiative cooling material with a single color has been greatly limited in practical application. In order to improve the aesthetic characteristics of the radiative cooling material, it is necessary to color the material
[0004] At present, the color effect is obtained by coloring radiation cooling materials mainly by adding pigments, but pigments will absorb light in the wavelength range of 300nm to 700nm and generate heat, which will eventually lead to a decline in the cooling performance of radiation cooling materials, for example: Inorganic-polymer radiative cooling artificial turf can be prepared by embedding chromium oxide pigment particles in high-density polyethylene. The organic medium provides radiation performance, and chromium oxide pigment particles make it appear green, but the absorption of sunlight by chromium oxide pigment particles will cause The reflectivity of radiative cooling artificial turf in the visible light range is less than 50%, which inhibits the cooling effect (Zhangbin Yang, Tiankai Jiang, Jun Zhang. Passive daytime radiative cooling inorganic-polymeric composite artificial lawn for the alternative to the natural lawn[J].Solar Energy Materials and Solar Cells, 219)
In addition, some researchers also combined the 3D grating structure (Zhu L, Raman A, Fan S. Color-preserving daytime radiative cooling [J]. Applied Physics Letters, 2013, 103(22): 223902) and the metal-insulator-metal structure ( Wei, Shi, Zhen, et al.Photonic thermal management of colored objects.[J].Naturecommunications,2018.) Applied to radiative cooling materials, these complex structures require accurate calculation and design of multilayer thin films, as well as sophisticated instruments , the preparation process is complicated and the cost is high

Method used

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  • Colored radiation refrigeration film and preparation method thereof
  • Colored radiation refrigeration film and preparation method thereof
  • Colored radiation refrigeration film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] A kind of color radiation cooling film, its preparation method comprises the following steps:

[0041] 1) Add 12g of styrene and 0.03g of sodium lauryl sulfate into 130mL of deionized water, place in a nitrogen atmosphere, adjust the stirring speed to 200rpm, stir for 1h, then add 0.1g of ammonium persulfate, and heat up React at 70°C for 4 hours, centrifuge to obtain polystyrene microspheres;

[0042] 2) Mix 20g of polyacrylate emulsion with a solid content of 50%, 10g of titanium dioxide, 1.5g of dispersant BYK-2015, 0.3g of defoamer Tego-810, 0.3g of leveling agent BYK-348 and 0.9g of Mix the film-forming agent alcohol ester twelve, then add zirconia ball milling beads, conduct ball milling to make a slurry, and then use aluminum foil as the base to coat the film with a film thickness of 50 μm and dry at 30°C to obtain a radiation cooling film layer;

[0043] 3) Add 1g of polystyrene microspheres to 9mL of deionized water, then add 3.3g of polyacrylate emulsion with...

Embodiment 2

[0048] A kind of color radiation cooling film, its preparation method comprises the following steps:

[0049] 1) Add 15g of styrene and 0.05g of sodium lauryl sulfate into 130mL of deionized water, and place in a nitrogen atmosphere, adjust the stirring speed to 350rpm, stir for 1h, then add 0.15g of ammonium persulfate, and heat up React at 80°C for 6 hours, centrifuge to obtain polystyrene microspheres;

[0050] 2) Mix 10g of water-based polyvinylidene fluoride resin with a solid content of 50%, 15g of calcium carbonate, 1.25g of dispersant BYK-2015, 0.5g of defoamer Tego-810, 0.25g of leveling agent BYK-348 and Mix 0.75g of film-forming agent alcohol ester twelve, then add zirconia ball milling beads, carry out ball milling to make a slurry, and then use aluminum foil as a substrate to coat the film with a film thickness of 100 μm and dry at 45°C to obtain a radiation cooling film layer;

[0051] 3) Add 3g of polystyrene microspheres to 7mL of deionized water, then add 0.7...

Embodiment 3

[0053] A kind of color radiation cooling film, its preparation method comprises the following steps:

[0054] 1) Add 18g of styrene and 0.07g of sodium lauryl sulfate into 130mL of deionized water, and place in a nitrogen atmosphere, adjust the stirring speed to 500rpm, stir for 1h, then add 0.22g of ammonium persulfate, and raise the temperature React at 80°C for 8 hours, centrifuge to obtain polystyrene microspheres;

[0055] 2) Mix 8g of water-based polyvinylidene fluoride resin with a solid content of 50%, 20g of magnesium phosphite, 1.4g of dispersant BYK-2015, 0.28g of defoamer Tego-810, and 0.28g of leveling agent BYK-348 Mix with 0.84g of film-forming agent alcohol ester twelve, then add zirconia ball milling beads, conduct ball milling to make a slurry, and then use aluminum foil as the base to coat the film with a film thickness of 150 μm and dry at 60°C to obtain a radiation cooling film layer ;

[0056] 3) Add 5g of polystyrene microspheres to 5mL of deionized wa...

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Abstract

The invention discloses a colored radiation refrigeration film and a preparation method thereof. The colored radiation refrigeration film comprises a radiation refrigeration film layer and a structural color forming layer which are laminated, wherein the radiation refrigeration film layer comprises polyacrylate / water-based polyvinylidene fluoride resin, inorganic filler and auxiliaries, and the structural color forming layer is a self-assembled polystyrene microsphere layer; the composition comprises polystyrene microspheres and polyacrylate / water-based polyvinylidene fluoride resin. The preparation method of the colored radiation refrigeration film comprises the following steps: 1) preparing polystyrene microspheres; 2) preparing a radiation refrigeration film layer; 3) preparing the structural color forming layer. The colored radiation refrigeration film has a beautiful structural color, cannot absorb visible light, is high in sunlight reflectivity and mid-infrared emissivity, has a refrigeration effect and aesthetic characteristics, is simple in preparation process, does not need to be controlled by a precise instrument, and is low in cost.

Description

technical field [0001] The invention relates to the technical field of passive radiation cooling materials, in particular to a colored radiation cooling film and a preparation method thereof. Background technique [0002] Under the background of the urban heat island effect and global warming, the summer temperature remains high, and the demand for active cooling methods represented by air conditioners continues to grow, which will not only consume a lot of energy, but also produce greenhouse gases that will further aggravate global warming , causing a vicious circle. [0003] Radiation cooling is a passive cooling method, which uses the universe with a background temperature of 3K as a natural radiator, and radiates surface heat into outer space through atmospheric windows with high transmittance (3μm-5μm, 8μm-13μm), without energy consumption. cooling can be achieved. Most of the energy in daily life comes from the sun. Therefore, in order to achieve a good cooling effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/04C09D7/61C09D125/06C09D127/16C09D5/29C09D5/33
CPCC09D133/04C09D7/61C09D125/06C09D5/29C09D127/16C09D5/004C08K2003/2241C08K3/22C08L33/04C08L27/16
Inventor 钟明峰邱玲玉张志杰黄植
Owner SOUTH CHINA UNIV OF TECH
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