A radiation cooling device and its application in glacier protection

Abstract

The present invention relates to a radiation refrigeration device, which is composed of a radiation refrigeration coating with a thickness of 150 to 300 microns coated on a heat insulation layer. The heat insulation layer is composed of a plastic film with a uniform air bubble structure, each air bubble has a height of 1 mm to 3 mm, a diameter of 7 mm to 11 mm, and a spacing between two adjacent air bubbles of 1 mm to 3 mm; the radiation refrigeration coating is composed of the following raw materials by mass: 10 to 25 parts of functional pigments, 4 to 6 parts of hydrophobic components, 20 to 40 parts of binders, 30 to 40 parts of deionized water, 3 to 5 parts of dispersants, 1 to 5 parts of wetting agents, 1 to 4 parts of defoamers, and 1 to 3 parts of leveling agents. At the same time, the present invention also discloses the application of the radiation refrigeration device in glacier protection. The present invention has excellent flexibility, hydrophobicity, weather resistance, wide working temperature range and other characteristics, and while obtaining excellent radiation refrigeration performance, it also shows good flexibility and hydrophobicity, which can effectively alleviate glacier melting for a long time.

Description

Technical Field

[0001] The present invention relates to the field of applied technology, and in particular to a radiation refrigeration device and its application in glacier protection. Background Art

[0002] As the global climate continues to warm, glaciers that have been dormant for tens of thousands or even hundreds of thousands of years are beginning to melt at an accelerated rate. A new study shows that the extent of future sea level rise due to the melting of polar glaciers may be underestimated. Therefore, it is urgent to slow down the rate of glacier melting. In recent years, researchers have been constantly looking for ways to protect glaciers.

[0003] At the beginning, some researchers carried out snowfall experiments on glaciers to achieve glacier protection. Snowfall will make the glacier white, increase the mass of the glacier, and also increase the albedo of the glacier, thereby slowing down the melting of the glacier. Some researchers also used geotextiles as thermal insulation materials to conduct experiments to slow down the melting of glaciers. The data showed that the equilibrium melting rate of materials in the area covered by geotextiles was significantly lower than that in the uncovered area. However, the reflectivity of geotextiles can only reach 80%, and the hydrophobicity is also poor. In addition, its surface will turn black due to natural dust deposition, reducing the albedo, which is not conducive to the long-term and effective protection of glaciers. The above two methods for slowing down glacier melting are both localized to a certain extent and are difficult to promote on a larger scale. Therefore, there is an urgent need for a new method to alleviate the harm caused by the increasing melting of glaciers to the ecology.

[0004] As a new type of refrigeration technology with zero energy consumption and zero pollution, radiative cooling provides new strategies and opportunities for effectively slowing down glacier melting. The universe is a huge cold source, and its temperature is almost close to absolute zero (0 K), while the earth's ambient temperature is 300K. Therefore, objects on the ground can transfer heat to outer space at the atmospheric window (8-13µm) in the form of thermal radiation. At the same time, during the day, by minimizing the absorption of solar energy (0.3-2.5µm), a cooling effect below the ambient temperature is achieved, thereby achieving radiative cooling. Therefore, it is necessary to design a method to effectively slow down glacier melting using radiative cooling technology, which can greatly promote ecological sustainable development. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a radiation refrigeration device which can effectively and permanently alleviate the melting of glaciers.

[0006] Another technical problem to be solved by the present invention is to provide application of the radiation cooling device in glacier protection.

[0007] To solve the above problems, the present invention discloses a radiation cooling device, characterized in that: the device is composed of a radiation cooling coating with a thickness of 150 to 300 microns coated on a thermal insulation layer; the thermal insulation layer is composed of a plastic film with a uniform air bubble structure, each air bubble has a height of 1 mm to 3 mm, a diameter of 7 mm to 11 mm, and a spacing between two adjacent air bubbles of 1 mm to 3 mm; the radiation cooling coating is composed of the following raw materials in parts by mass: 10 to 25 parts of functional pigments, 4 to 6 parts of hydrophobic components, 20 to 40 parts of binders, 30 to 40 parts of deionized water, 3 to 5 parts of dispersants, 1 to 5 parts of wetting agents, 1 to 4 parts of defoaming agents, and 1 to 3 parts of leveling agents.

[0008] The functional pigment is a composite of at least one of zirconium oxide, silicon oxide, silicon nitride, boron nitride, barium sulfate, and calcium carbonate, wherein the particle size of each pigment is between 100 nanometers and 2 micrometers, the electronic band gap is between 5 electron volts and 9 electron volts, and the refractive index is between 1.5 and 2.5.

[0009] The hydrophobic component is one or two of dodecafluoroheptylpropylmethoxysilane and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane.

[0010] The adhesive is one or two of acrylic emulsion, hydroxy acrylic emulsion, fluorocarbon emulsion and styrene acrylic emulsion.

[0011] The dispersant is one or two of BYK-154, DISPERBYK-2014 and ANTI-TERRA-U 100.

[0012] The wetting agent is one or two of DISPERBYK-181, DISPERBYK-2081 and BYK-1165.

[0013] The defoaming agent is one or two of BYK-1794, BYK-1723 and BYK-019.

[0014] The leveling agent is one or two of AQUATIX 8421, GARAMITE-2578 and OPTIGEL-CG.

[0015] The material of the heat insulation layer is one of polyvinyl chloride, polyethylene, polypropylene and polystyrene.

[0016] A method for preparing the radiation cooling device as described above comprises the following steps:

[0017] ⑴Weigh according to the ratio;

[0018] ⑵ After deionized water, binder, wetting agent, dispersant, defoamer and leveling agent are evenly mixed and dispersed, functional pigments and hydrophobic components are added, and a high-speed disperser is used to stir at a speed of 400-800 r / min for 90-120 min, and then filtered with a 100-200 mesh screen to obtain a radiation cooling coating, which is sealed and stored;

[0019] ⑶ Under the conditions of an ambient temperature of 15-30°C and a relative air humidity of less than 85%, the radiation cooling coating is applied twice on the thermal insulation layer by brushing, rolling or using a 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain a radiation cooling device.

[0020] The application of a radiation cooling device in glacier protection as described above is characterized in that the radiation cooling device is laid on the surface of the glacier and is fixed by pressing with stones covered with white reflective cloth on all sides.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention adds functional pigments with excellent spectral selectivity, which have specific band structures, refractive indices and extinction coefficients. By adding pigments with a wide particle size distribution, interfaces with multiple dielectric contrasts are obtained, and multiple scattering of sunlight is achieved. At the same time, the complex crystal structure and appropriate bond strength of the pigments make it appear more infrared photophonon modes in the 8-13µm band, which improves the overall reflection performance of the material to sunlight and the infrared radiation performance, showing good radiation cooling performance (such as Figures 2~4 as shown).

[0023] 2. The heat insulation layer used in the present invention has an air bubble structure, which is beneficial to heat insulation, reduces the convective heat transfer between the air and the ice surface, and effectively realizes ice protection; at the same time, the structure has excellent mechanical properties, can be bent and stretched to different degrees, is suitable for laying on ice surfaces with different slopes, and is beneficial to prevent ice melting over a large area.

[0024] 3. The coating material prepared by the present invention has good flexibility and will not break due to brittleness even when working at extremely low temperatures on the ice surface; in addition, the prepared coating material has super hydrophobic properties due to the presence of the fluorine-containing structure, which can effectively achieve self-cleaning, and can maintain the high reflectivity and high emissivity characteristics of the coating for a long time even when affected by complex environments such as wind, sand, and rain outdoors, greatly improving the service life of the coating in outdoor anti-icing.

[0025] 4. The device of the present invention has excellent flexibility, hydrophobicity, weather resistance, wide operating temperature range (-30°C~70°C), etc., which can meet the refrigeration needs of different application scenarios. While achieving excellent radiation refrigeration performance, it also exhibits good flexibility and hydrophobicity, which can effectively alleviate glacier melting for a long time and greatly promote ecological sustainable development.

[0026] 5. The present invention has simple process, low cost, high production efficiency and can realize large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic structural diagram of the radiation refrigeration device of the present invention.

[0029] In the figure: 1 - radiant cooling coating; 2 - thermal insulation layer.

[0030] Figure 2 This is a solar reflection spectrum diagram of the radiation cooling device in Example 5 of the present invention in the 0.3~2.5 μm band.

[0031] Figure 3 This is an infrared emission spectrum diagram of the radiation cooling device in Example 5 of the present invention in the 2.5-16 μm band.

[0032] Figure 4 This is an outdoor cooling test of the radiant cooling device of Example 5 of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, a radiation cooling device is formed by coating a radiation cooling coating 1 with a thickness of 150 to 300 microns on a heat insulation layer 2. The thickness of the radiation cooling coating 1 is preferably 100 to 250 microns.

[0034] The thermal insulation layer 2 is made of one of polyvinyl chloride, polyethylene, polypropylene, and polystyrene, and is composed of a plastic film with a uniform air bubble structure. The height of each air bubble is between 1 mm and 3 mm, the diameter is between 7 mm and 11 mm, and the distance between each adjacent air bubble is between 1 mm and 3 mm.

[0035] The radiation cooling coating 1 is composed of the following raw materials in parts by mass (g): 10-25 parts of functional pigment, 4-6 parts of hydrophobic component, 20-40 parts of binder, 30-40 parts of deionized water, 3-5 parts of dispersant, 1-5 parts of wetting agent, 1-4 parts of defoaming agent, and 1-3 parts of leveling agent.

[0036] Among them: the functional pigment is a composite of at least one of zirconium oxide, silicon oxide, silicon nitride, boron nitride, barium sulfate, and calcium carbonate, wherein the particle size of each pigment is between 100 nanometers and 2 microns, the electronic band gap is between 5 electron volts and 9 electron volts, and the refractive index is between 1.5 and 2.5.

[0037] The hydrophobic component is one or two of dodecafluoroheptylpropylmethoxysilane and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane.

[0038] The adhesive is one or two of acrylic emulsion, hydroxy acrylic emulsion, fluorocarbon emulsion and styrene acrylic emulsion.

[0039] The dispersant is one or two of BYK-154, DISPERBYK-2014 and ANTI-TERRA-U 100.

[0040] The wetting agent is one or two of DISPERBYK-181, DISPERBYK-2081 and BYK-1165.

[0041] The defoaming agent is one or two of BYK-1794, BYK-1723 and BYK-019.

[0042] The leveling agent is one or two of AQUATIX 8421, GARAMITE-2578, and OPTIGEL-CG.

[0043] The preparation method of the radiation refrigeration device comprises the following steps:

[0044] ⑴Weigh according to the ratio;

[0045] (2) After deionized water, binder, wetting agent, dispersant, defoamer and leveling agent are mixed and dispersed uniformly, functional pigment and hydrophobic component are added, and a high-speed disperser is used to stir at a speed of 400-800 r / min for 90-120 min, and then filtered with a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0046] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0047] A radiation cooling device is used in glacier protection: the radiation cooling device is laid on the surface of the glacier and fixed with stones wrapped with white reflective cloth on all sides to reduce the impact of air convection heat transfer around the device and effectively prevent glacier melting.

[0048] Embodiment 1 A radiation cooling device comprises a radiation cooling coating 1 coated on a heat insulation layer 2.

[0049] The heat-insulating layer 2 is composed of a polyethylene film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 8 mm to 10 mm, and a spacing of 2 mm to 3 mm between two adjacent air bubbles.

[0050] The radiation cooling coating 1 is composed of the following raw materials in parts by mass: 6 g zirconium oxide, 2 g barium sulfate, 2 g boron nitride, 4 g dodecafluoroheptylpropylmethoxysilane, 40 g acrylic emulsion, 38 g deionized water, 3 g dispersant (BYK-154), 2 g wetting agent (DISPERBYK-181), 2 g defoamer (BYK-1723), and 1 g leveling agent (AQUATIX 8421).

[0051] The preparation method thereof comprises the following steps:

[0052] ⑴Weigh according to the ratio;

[0053] (2) After deionized water, acrylic emulsion, wetting agent, dispersant, defoamer and leveling agent are uniformly dispersed, zirconium oxide, barium sulfate, boron nitride and dodecafluoroheptylpropylmethoxysilane are added, and stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered with a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0054] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0055] The performance indicators of the obtained coatings are shown in Table 1.

[0056] Table 1

[0057]

[0058] Embodiment 2 A radiation cooling device comprises a radiation cooling coating 1 coated on a heat insulation layer 2.

[0059] The heat-insulating layer 2 is composed of a polystyrene film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 7 mm to 10 mm, and a spacing of 2 mm to 3 mm between two adjacent air bubbles.

[0060] The radiation cooling coating 1 is composed of the following raw materials in parts by mass: 10 g zirconium oxide, 10 g barium sulfate, 5 g silicon nitride, 6 g 1H,1H,2H,2H-perfluorodecyltriethoxysilane, 20 g acrylic emulsion, 30 g deionized water, 5 g dispersant (DISPERBYK-2014), 5 g wetting agent (DISPERBYK-2081), 4 g defoamer (BYK-1794), and 3 g leveling agent (GARAMITE-2578).

[0061] The preparation method thereof comprises the following steps:

[0062] ⑴Weigh according to the ratio;

[0063] (2) After deionized water, acrylic emulsion, wetting agent, dispersant, defoamer and leveling agent are uniformly dispersed, zirconium oxide, barium sulfate, silicon nitride and 1H,1H,2H,2H-perfluorodecyltriethoxysilane are added, and stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered with a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0064] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0065] The performance indicators of the obtained coatings are shown in Table 2.

[0066] Table 2

[0067]

[0068] Embodiment 3 A radiation cooling device, which is composed of a radiation cooling coating 1 coated on a heat insulation layer 2.

[0069] The heat-insulating layer 2 is composed of a polypropylene film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 9 mm to 10 mm, and a spacing of 1 mm to 3 mm between two adjacent air bubbles.

[0070] The radiation cooling coating 1 is composed of the following raw materials in parts by mass: 10 g zirconium oxide, 5 g silicon oxide, 5 g calcium carbonate, 4 g 1H,1H,2H,2H-perfluorodecyltriethoxysilane, 40 g styrene acrylic emulsion, 30 g deionized water, 3 g dispersant (ANTI-TERRA-250), 1 g wetting agent (BYK-1165), 1 g defoamer (BYK-019), and 1 g leveling agent (OPTIGEL-CG).

[0071] The preparation method thereof comprises the following steps:

[0072] ⑴Weigh according to the ratio;

[0073] (2) After deionized water, styrene acrylic emulsion, wetting agent, dispersant, defoaming agent and leveling agent are uniformly dispersed, zirconium oxide, silicon oxide, calcium carbonate and 1H,1H,2H,2H-perfluorodecyltriethoxysilane are added, and the mixture is stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered using a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0074] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0075] The coating performance indicators are shown in Table 3.

[0076] Table 3

[0077]

[0078] Embodiment 4 A radiation cooling device comprises a radiation cooling coating 1 coated on a heat insulation layer 2.

[0079] The heat-insulating layer 2 is composed of a polyvinyl chloride film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 8 mm to 10 mm, and a spacing of 2 mm to 3 mm between two adjacent air bubbles.

[0080] The radiation cooling coating 1 is composed of the following raw materials in parts by mass: 10 g zirconium oxide, 5 g boron nitride, 10 g calcium carbonate, 6 g dodecafluoroheptylpropylmethoxysilane, 30 g styrene acrylic emulsion, 30 g deionized water, 3 g dispersant (DISPERBYK-2014), 2 g wetting agent (BYK-1165), 2 g defoamer (BYK-1723), and 2 g leveling agent (AQUATIX 8421).

[0081] The preparation method thereof comprises the following steps:

[0082] ⑴Weigh according to the ratio;

[0083] (2) After deionized water, styrene acrylic emulsion, wetting agent, dispersant, defoamer and leveling agent are uniformly dispersed, zirconium oxide, boron nitride, calcium carbonate and dodecafluoroheptylpropylmethoxysilane are added, and the mixture is stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered using a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0084] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0085] The coating performance indicators are shown in Table 4.

[0086] Table 4

[0087]

[0088] Embodiment 5 A radiation cooling device comprises a radiation cooling coating 1 coated on a heat insulation layer 2.

[0089] The heat-insulating layer 2 is composed of a polyethylene film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 8 mm to 10 mm, and a spacing of 2 mm to 3 mm between two adjacent air bubbles.

[0090] The radiation cooling coating 1 is composed of the following raw materials in parts by mass: 6 g zirconium oxide, 3 g boron nitride, 6 g calcium carbonate, 5 g 1H,1H,2H,2H-perfluorodecyltriethoxysilane, 40 g fluorocarbon emulsion, 30 g deionized water, 3 g dispersant (DISPERBYK-2014), 2 g wetting agent (DISPERBYK-2081), 2 g defoamer (BYK-1794), and 2 g leveling agent (AQUATIX 8421).

[0091] The preparation method thereof comprises the following steps:

[0092] ⑴Weigh according to the ratio;

[0093] (2) After deionized water, fluorocarbon emulsion, wetting agent, dispersant, defoamer and leveling agent are uniformly dispersed, zirconium oxide, boron nitride, calcium carbonate and 1H,1H,2H,2H-perfluorodecyltriethoxysilane are added, and the mixture is stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered using a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0094] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0095] The performance indicators of the obtained coatings are shown in Table 5.

[0096] Table 5

[0097]

[0098] Embodiment 6 A radiation cooling device, which is composed of a radiation cooling coating 1 coated on a heat insulation layer 2.

[0099] The heat-insulating layer 2 is composed of a polypropylene film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 9 mm to 10 mm, and a spacing of 1 mm to 3 mm between two adjacent air bubbles.

[0100] The radiation cooling coating 1 is composed of the following raw materials in parts by mass: 8 g zirconium oxide, 4 g barium sulfate, 8 g calcium carbonate, 4 g dodecafluoroheptylpropylmethoxysilane, 35 g fluorocarbon emulsion, 33 g deionized water, 3 g dispersant (DISPERBYK-2014), 3 g wetting agent (DISPERBYK-2081), 1 g defoamer (BYK-1794), and 1 g leveling agent (AQUATIX 8421).

[0101] The preparation method thereof comprises the following steps:

[0102] ⑴Weigh according to the ratio;

[0103] (2) After deionized water, fluorocarbon emulsion, wetting agent, dispersant, defoaming agent and leveling agent are uniformly dispersed, zirconium oxide, barium sulfate, calcium carbonate and dodecafluoroheptylpropylmethoxysilane are added, and the mixture is stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered using a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0104] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0105] The performance indicators of the obtained coatings are shown in Table 6.

[0106] Table 6

[0107]

[0108] Embodiment 7 A radiation cooling device comprises a radiation cooling coating 1 coated on a heat insulation layer 2.

[0109] The heat-insulating layer 2 is composed of a polystyrene film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 7 mm to 10 mm, and a spacing of 2 mm to 3 mm between two adjacent air bubbles.

[0110] The radiant cooling coating 1 is composed of the following raw materials in parts by mass: 4 g barium sulfate, 4 g boron nitride, 2 g calcium carbonate, 6 g 1H,1H,2H,2H-perfluorodecyltriethoxysilane, 40 g hydroxy acrylic emulsion, 37 g deionized water, 3 g dispersant (BYK-154), 2 g wetting agent (DISPERBYK-181), 1 g defoamer (BYK-024), and 1 g leveling agent (BYK-349).

[0111] The preparation method thereof comprises the following steps:

[0112] ⑴Weigh according to the ratio;

[0113] (2) After deionized water, hydroxy acrylic emulsion, wetting agent, dispersant, defoamer and leveling agent are uniformly dispersed, barium sulfate, boron nitride, calcium carbonate and 1H,1H,2H,2H-perfluorodecyltriethoxysilane are added, and stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered with a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0114] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0115] The performance indicators of the obtained coatings are shown in Table 7.

[0116] Table 7

[0117]

[0118] Embodiment 8 A radiation cooling device comprises a radiation cooling coating 1 coated on a heat insulation layer 2.

[0119] The heat-insulating layer 2 is composed of a polyvinyl chloride film with a uniform air bubble structure, each air bubble has a height of 2 mm to 3 mm, a diameter of 8 mm to 10 mm, and a spacing of 2 mm to 3 mm between two adjacent air bubbles.

[0120] The radiant cooling coating 1 is composed of the following raw materials in parts by mass: 5 g of barium sulfate, 5 g of silicon nitride, 4 g of calcium carbonate, 4 g of dodecafluoroheptylpropylmethoxysilane, 35 g of hydroxy acrylic emulsion, 40 g of deionized water, 3 g of dispersant (ANTI-TERRA-250), 2 g of wetting agent (DISPERBYK-2081), 1 g of defoaming agent (BYK-1723), and 1 g of leveling agent (AQUATIX 8421).

[0121] The preparation method thereof comprises the following steps:

[0122] ⑴Weigh according to the ratio;

[0123] (2) After deionized water, hydroxy acrylic emulsion, wetting agent, dispersant, defoamer and leveling agent are uniformly dispersed, barium sulfate, silicon nitride, calcium carbonate and dodecafluoroheptylpropylmethoxysilane are added, and the mixture is stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered using a 100-200 mesh screen to obtain a radiation cooling coating 1, which is sealed and stored;

[0124] ⑶ Under the condition of ambient temperature of 15-30℃ and relative air humidity below 85%, the radiation cooling coating 1 is coated twice on the thermal insulation layer 2 by brushing, rolling or 0.8MPa compressed air gun. After coating, it is allowed to stand at room temperature for curing to obtain the radiation cooling device.

[0125] The coating performance indicators are shown in Table 8.

[0126] Table 8

[0127]

Claims

1. A radiation cooling device, characterized in that: The radiation cooling device is laid on the surface of a glacier, and the device is composed of a radiation cooling coating (1) with a thickness of between 150 and 300 microns coated on a heat insulating layer (2); the heat insulating layer (2) is composed of a plastic film with a uniform air bubble structure, each air bubble has a height of between 1 mm and 3 mm, a diameter of between 7 mm and 11 mm, and a distance between two adjacent air bubbles of between 1 mm and 3 mm; The radiant cooling coating (1) is composed of the following raw materials in parts by weight: 10-25 parts of functional pigment, 4-6 parts of hydrophobic component, 20-40 parts of binder, 30-40 parts of deionized water, 3-5 parts of dispersant, 1-5 parts of wetting agent, 1-4 parts of defoamer, and 1-3 parts of leveling agent; the functional pigment is a composite of at least one of zirconium oxide, silicon oxide, silicon nitride, boron nitride, barium sulfate, and calcium carbonate, wherein the particle size of each functional pigment is between 100 nanometers and 2 micrometers. , the electronic band gap is between 5 electron volts and 9 electron volts, and the refractive index is between 1.5 and 2.5; the hydrophobic component is one or two of dodecafluoroheptylpropylmethoxysilane and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane; the binder is one or two of acrylic emulsion, hydroxy acrylic emulsion, fluorocarbon emulsion, styrene acrylic emulsion; the dispersant is BYK-154, DISPERBYK-2014, ANTI-TERRA-U 100; the wetting agent is one or two of DISPERBYK-181, DISPERBYK-2081, and BYK-1165; the defoaming agent is one or two of BYK-1794, BYK-1723, and BYK-019; the leveling agent is one or two of AQUATIX 8421, GARAMITE-2578, and OPTIGEL-CG.

2. A radiant cooling device according to claim 1, characterized in that: The material of the heat insulating layer (2) is one of polyvinyl chloride, polyethylene, polypropylene and polystyrene.

3. A method for preparing a radiant cooling device according to claim 1, comprising the following steps: ⑴Weigh according to the ratio; (2) After deionized water, binder, wetting agent, dispersant, defoamer and leveling agent are uniformly mixed and dispersed, functional pigment and hydrophobic component are added, and the mixture is stirred at a speed of 400-800 r / min for 90-120 min using a high-speed disperser, and then filtered using a 100-200 mesh screen to obtain a radiation cooling coating (1), which is then sealed and stored; (3) Under the condition that the ambient temperature is 15-30° C. and the relative humidity of air is lower than 85%, the radiation cooling coating (1) is coated twice on the thermal insulation layer (2) by brushing, rolling or using a 0.8 MPa compressed air gun, and after coating, it is allowed to stand at room temperature to solidify, thereby obtaining a radiation cooling device.

4. The application of a radiation cooling device in glacier protection as claimed in claim 1 is characterized in that: Lay the radiation cooling device on the surface of the glacier and press it in place with stones wrapped in white reflective cloth.

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