Radiation refrigeration coating with gradient structure as well as preparation method and application thereof

A radiative cooling, gradient structure technology, applied in coatings, reflective/signal coatings, devices for coating liquids on surfaces, etc., can solve problems such as hidden dangers of material stability, mismatch, performance compromise, etc. Anti-peeling effect

Active Publication Date: 2020-09-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first blended coating / film material has a uniform structure. Although it has both solar reflection and mid-infrared emission properties, it cannot give full play to the respective advantages of polymers and inorganic powders. It is a performance compromise.
Although the second laminated heterogeneous structure can theoretically achieve the optimal radiation cooling effect, there are serious thermal expansion and mechanical mismatch problems between the upper and lower layers of the material, resulting in peeling and delamination of the material during long-term use. Problems, there are major hidden dangers in material stability
In addition, laminated structure materials need to be molded multiple times, and the preparation process is relatively cumbersome

Method used

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  • Radiation refrigeration coating with gradient structure as well as preparation method and application thereof
  • Radiation refrigeration coating with gradient structure as well as preparation method and application thereof
  • Radiation refrigeration coating with gradient structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] figure 2 It is a flowchart of a method for preparing a radiation cooling coating with a gradient structure provided by an embodiment of the present invention, such as figure 2 Shown, this preparation method comprises:

[0036] S11. Uniformly disperse the polymer binder and the inorganic powder in a solvent to obtain a suspension, the emissivity of the polymer binder in the mid-infrared band (2.5-25 μm) is higher than 0.85, and the inorganic powder is in the solar spectrum band (0.3~2.5μm) the reflectivity is higher than 0.85;

[0037] S12, spraying or scraping the suspension on the substrate;

[0038] S13. The solvent volatilizes slowly, so that in the direction away from the radiation surface, the content of the polymer binder gradually decreases, and the content of the inorganic powder gradually increases.

[0039] At room temperature, the polymer binder dissolves in the solvent to form small-sized molecular chains, which can migrate upwards with the volatilizati...

Embodiment 1

[0046] The coating described in this example consists of BaSO 4 , PVB composition. Among them, PVB: BaSO 4 The mass ratio is 1:5, BaSO 4 The average particle size is 0.5μm; coating radiation surface to adhesion surface PVB:BaSO 4 The volume ratio gradually transitions from 2:1 to 1:10.

[0047] The coating preparation process is as follows: the BaSO 4 , PVB is dispersed in a certain volume of solvent in proportion, and then treated with a homogenizer for 30 minutes to obtain a uniform suspension. The volume fraction of the solvent in the suspension is 50%; the solvent is a mixture of water and ethanol, wherein the volume ratio of water and ethanol is 1:9. Brush the suspension on a glass plate with a coater, and dry it at room temperature for 1 hour to form a coating with a thickness of about 500 μm. During the drying process, the solvent volatilization induces the migration of the polymer binder to the radiant side exposed to the air, thereby forming a gradient structure...

Embodiment 2

[0050] The coating described in this example consists of BaSO 4 , PVB composition. Among them, PVB: BaSO 4 The mass ratio is 1:5, BaSO 4 The average particle size is 0.5μm; coating radiation surface to adhesion surface PVB:BaSO 4 The volume ratio gradually transitions from 5:1 to 1:20.

[0051] The coating preparation process is as follows: the BaSO 4 , PVB is dispersed in a certain volume of solvent in proportion, and then treated with a homogenizer for 30 minutes to obtain a uniform suspension. The volume fraction of the solvent in the suspension is 65%; the solvent is a mixture of water and ethanol, wherein the volume ratio of water and ethanol is 2:8. Use a coating machine to brush the suspension on a glass plate, and dry it at room temperature for 1.5 hours to form a coating with a thickness of about 500 μm. In this example, the higher the solvent content, the longer the evaporative drying time, thus inducing the formation of a more pronounced gradient structure.

...

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Abstract

The invention discloses a radiation refrigeration coating with a gradient structure and a preparation method and application thereof, and belongs to the field of novel materials. The invention provides the radiation refrigeration coating with a gradient structure. The coating comprises a polymer adhesive and inorganic powder which are blended, wherein the emissivity of the polymer adhesive in a middle-infrared band is higher than 0.85, the reflectivity of the inorganic powder in a solar spectrum band is higher than 0.85, and the content of the polymer adhesive is gradually reduced and the content of the inorganic powder is gradually increased in a direction far away from a radiation surface. In this way, it can be guaranteed that a large number of the polymer adhesive is located on the upper portion and the inorganic powder is located on the lower portion in the coating, and due to the fact that the polymer adhesive is used for emitting mid-infrared spectra and the inorganic powder ismainly used for reflecting solar spectra, a good refrigerating effect can be guaranteed. The polymer adhesive and the inorganic powder form the integrated coating, so that the problems of peeling, delaminating and the like caused by lamination of two layers of materials can be prevented, and the effects of balanced transition in structure and structural stability are achieved.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a radiation cooling coating with a gradient structure and a preparation method thereof. Background technique [0002] Against the backdrop of global warming, building cooling energy consumption has accounted for 20%-50% of global energy consumption. Traditional building refrigeration mainly adopts the active refrigeration technology of compression heat cycle (ie air conditioning). This refrigeration technology consumes a lot of electricity, exacerbating global warming and energy crisis, forming a vicious circle. [0003] Radiation refrigeration is a radiation refrigeration technology with zero energy consumption. It means that the heat source exchanges heat with the outer space cold source (~3K) through the infrared window in the atmosphere in the form of thermal radiation. Most materials have good thermal radiation ability, but they also absorb sunlight at the same time, and the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/14C09D127/18C09D101/28C09D133/06C09D5/33B05D7/24
CPCC09D129/14C09D127/18C09D101/28C09D133/06C09D5/004C09D7/69C09D7/68C09D7/67B05D7/24C08K2003/3045C08K2201/003C08K2201/011C08K2003/2241C08K2003/265C08K3/30C08K3/22C08L27/18C08L29/14C08K3/26C08L33/06C08K3/36
Inventor 周军段将将胡彬刘沛
Owner HUAZHONG UNIV OF SCI & TECH
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