CN113939146A

CN113939146A - 5G base station AAU heat dissipation system, radiation refrigeration coating, coating and coating preparation method

Info

Publication number: CN113939146A
Application number: CN202110997112.9A
Authority: CN
Inventors: 陈梅洁; 庞丹; 陈卓; 闫红杰
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2021-08-27
Filing date: 2021-08-27
Publication date: 2022-01-14
Anticipated expiration: 2041-08-27
Also published as: CN113939146B

Abstract

The invention discloses an AAU (architecture) heat dissipation system of a 5G base station, which comprises: the vacuum cavity temperature equalizing plate is in contact with the inner wall of the AAU box body of the 5G base station, and the radiation refrigeration coating is in contact with the outer surface of the AAU box body of the 5G base station. The mode that adopts temperature-uniforming plate and radiation refrigeration coating to combine together is on average to whole radiation refrigeration coating with the heat, effectively avoids the heat local concentration to promote the heat radiation characteristic, reduce the local temperature in surface. The invention also provides a radiation refrigeration coating for the 5G base station AAU heat dissipation system, and further provides a paint for preparing the radiation refrigeration coating and a preparation method of the paint.

Description

5G base station AAU heat dissipation system, radiation refrigeration coating, coating and coating preparation method

Technical Field

The invention relates to the field of equipment heat dissipation design, in particular to a 5G base station AAU heat dissipation system, and further relates to a radiation refrigeration coating for the 5G base station AAU heat dissipation system, a coating for preparing the radiation refrigeration coating and a preparation method of the coating.

Background

With the advent of the internet, big data and cloud computing era, the requirements of people on network capacity and speed are higher and higher. In recent years, the development of 5G has enabled high-rate, low-latency, and large connections for communication technologies. However, in the construction process of the 5G base station, the problems of large power consumption, more heat generation and slow heat dissipation are particularly prominent. As an important component of the 5G base station, the AAU (active antenna unit) adopts a large-scale dense multiple-input multiple-output antenna array technology. Compared with a 4G base station, the number of antenna channels of the 5G base station is increased by eight times, the carrier bandwidth is increased by five times, the computing power of a chip is increased by tens of times, and the heat dissipation capacity of an AAU of the 5G base station is increased by nearly three times. Different from the 4G base station RRU radiating by the whole shell, the 5G base station AAU can only radiate heat by the single side of the back shell, and the available radiating space is almost halved. At present, the AAU of the 5G base station adopts convection heat dissipation in a heat dissipation tooth form, heat generated inside the box body is mainly dissipated to the air through air convection heat transfer flowing through the heat dissipation teeth, and the heat dissipation effect is poor. And the volume of the radiating teeth accounts for 2/3 of the total volume of the 5G base station AAU, so that the box body is heavy and difficult to install. Considering the installation condition and the operation condition of equipment, the whole weight and the whole volume of the 5G base station AAU need to be strictly controlled, and the heat dissipation performance of the 5G base station AAU is improved.

Disclosure of Invention

The main purposes of the invention are as follows: the heat dissipation performance and the safety of the 5G base station AAU are improved while the whole weight and the whole volume of the 5G base station AAU are controlled.

In order to achieve the above object, in a first aspect, the present invention provides a 5G base station AAU heat dissipation system, including: the vacuum cavity temperature equalizing plate is in contact with the inner wall of the AAU box body of the 5G base station, and the radiation refrigeration coating is in contact with the outer surface of the AAU box body of the 5G base station. The heat locally generated by the 5G base station AAU is averaged to the outer wall surface of the base station through the vacuum cavity temperature equalizing plate, and then the heat is radiated to the outer space through the wall surface radiation refrigeration coating, so that the temperature of the 5G base station AAU is reduced.

In some possible embodiments, the vacuum chamber vapor chamber comprises: the cooling device comprises a plate body for forming a vacuum cavity, cooling liquid positioned in the vacuum cavity and a phase change guide structure positioned in the vacuum cavity.

In some possible embodiments, the phase change guiding structure includes: the evaporator is contacted with the inner wall of the plate body of the vacuum cavity temperature-equalizing plate, and the flow guide piece is arranged along the rising direction of steam; the evaporator is a porous copper net, and the flow guide piece comprises a plurality of capillary pipelines.

In a second aspect, the invention provides a coating for preparing a radiation refrigeration coating used in the 5G base station AAU heat dissipation system, wherein the coating comprises the following raw material components in percentage by mass: 10 to 50 percent of hollow glass microsphere, 0.5 to 5 percent of thickening agent, 0.1 to 10 percent of adhesive and water.

Further, the thickener is selected from: at least one of sodium carboxymethylcellulose, polyvinylpyrrolidone and sodium polyacrylate.

Further, the adhesive is selected from: at least one of styrene-butadiene rubber, aqueous polyurethane and ethylene-vinyl acetate copolymer.

Further, the raw material components of the coating also comprise, by mass: 0.2% -0.5% of photocrosslinking agent; the photocrosslinking agent comprises polyethylene glycol dimethacrylate and a photoinitiator.

In a third aspect, the present invention provides a preparation method of a coating, for preparing the coating, specifically comprising the following steps:

step S1, adding the thickening agent into water, heating to 50-90 ℃, and stirring for 1-2h to obtain a mixture A;

step S2, adding the hollow glass microspheres into the mixture A, and stirring until white slurry is formed to obtain a mixture B;

step S3, adding the adhesive into the mixture B, and uniformly mixing to obtain a mixture C;

step S4, adding a photocrosslinking agent into the mixture C to obtain a mixture D; and (3) operating the ultrasonic cell disruptor in the mixture D for 2-3min to enable the mixture D to generate a plurality of bubbles, and then standing for 12-24h to obtain the coating.

Further, in step S4, after the mixture D generates some bubbles, isopropyl alcohol is added.

In a fourth aspect, the present invention provides a radiation-curable coating, which is prepared by the following steps:

applying the coating to a substrate layer;

then curing for 5-30min by using ultraviolet light;

and finally drying the coating in an environment of 20-80 ℃ until no water vapor exists on the surface of the coating, thereby obtaining the radiation refrigeration coating.

The technical scheme provided by the invention at least has the following beneficial effects:

(1) the mode that adopts temperature-uniforming plate and radiation refrigeration coating to combine together can effectively avoid thermal local concentrated, with the heat on the average to whole radiation refrigeration coating to promote the heat radiation characteristic, reduce surface local temperature.

(2) The weight of the 5G base station AAU is greatly reduced, the total volume of the 5G base station AAU is reduced, and a large amount of working hours are saved for base station installation engineering.

(3) The radiation refrigeration coating prepared and used by the invention has wider infrared emission spectrum, so that the whole heat dissipation system has higher heat dissipation efficiency.

(4) The radiation refrigeration coating prepared and used by the invention has good flame retardance and high-temperature stability, and is used for an AAU (architecture automation unit) heat dissipation system of a 5G base station, so that the whole heat dissipation system is safer.

(5) The coating prepared and used by the invention can be directly coated on different substrates and has good adhesive force, so that the radiation refrigeration coating is not easy to fall off from the substrate.

(6) The coating prepared and used by the invention has better dispersion stability, and the components of the coating coated on the coating are more uniformly distributed and more beautiful.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an AAU heat dissipation system of a 5G base station according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a heat trend of the 5G base station AAU heat dissipation system shown in fig. 1;

FIG. 3 is a reflectance spectrum plot of the radiation-cooled coating shown in FIG. 1;

FIG. 4 is a schematic diagram illustrating a heat dissipation principle of the vapor chamber shown in FIG. 1;

FIG. 5 is a schematic structural diagram of a simulation experiment apparatus provided in the present invention;

FIG. 6 shows the specific positions of the heating plate and the measuring points in the simulation experiment apparatus provided by the present invention.

FIG. 7 is a graph showing the variation of solar radiation intensity measured in a simulation provided by the present invention, showing the solar radiation intensity at each measurement;

FIG. 8 is a curve of the highest temperature of the group A measuring points measured by the simulation experiment provided by the present invention along with the variation of heating time;

FIG. 9 is a curve of the highest temperature of the test points in group B measured by the simulation experiment provided by the present invention along with the change of heating time;

FIG. 10 is a curve of the highest temperature of the C group of measuring points measured by the simulation experiment provided by the present invention along with the change of heating time;

FIG. 11 is a graph showing the temperature distribution of an aluminum plate without a vapor chamber and with a coating, measured by a simulation provided by the present invention;

FIG. 12 is a graph of the temperature profile of a plate with a vapor chamber and coated aluminum measured by a simulation provided by the present invention;

FIG. 13 is a simulated heat dissipation effect of two IR emission spectra of different widths according to the present invention; wherein a shows the specific spectral ranges of the two infrared emission spectra, b shows the simulated heat dissipation rates of the two infrared emission spectra, and c shows the maximum temperature and the average temperature of the coating adopting the two infrared emission spectra after heat dissipation.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the drawings in the present invention are for illustrative and descriptive purposes only and are not used to limit the scope of the present invention. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The devices or materials used in the present invention can be purchased through conventional means, and if not otherwise specified, the devices or materials used in the present invention can be used according to the conventional methods in the art or according to the product specification. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described in this invention are exemplary only.

Referring to fig. 1, an AAU heat dissipation system of a 5G base station according to an embodiment of the present invention includes: the vacuum cavity temperature equalizing plate is in contact with the inner wall of the AAU box body of the 5G base station, and the radiation refrigeration coating is in contact with the outer surface of the AAU box body of the 5G base station.

As shown in FIG. 2, in the present embodiment, the vacuum chamber temperature equalizing plate transmits the heat Q generated by the operation inside the AAU box of the 5G base station to the outer surface of the box, and the heat Q₁Uniformly distributed on the outer surface of the box body (Q for heat on the outer surface of the box body)₁Representation). And because the radiation rate of the radiation refrigeration coating in the atmospheric window section is high, the radiation refrigeration coating can efficiently transfer the heat Q of the outer surface of the box body₁Radiating to the outside (for heat radiated to the outside by the radiation refrigeration coating Q₂Representation).

The 5G base stations AAU are arranged outdoors and are often irradiated by sunlight. As shown in fig. 3, the radiation refrigeration coating has high reflectivity to the sunlight wave band, and can reflect sunlight, thereby preventing the 5G base station AAU from being heated up rapidly due to the sunlight irradiation.

In this embodiment, the vacuum chamber vapor chamber includes: the cooling device comprises a plate body for forming a vacuum cavity, cooling liquid positioned in the vacuum cavity and a phase change guide structure positioned in the vacuum cavity.

In this embodiment, the cooling liquid is water, and in other specific embodiments, other liquids, such as a mixed liquid of alcohol and water, may also be used as the cooling liquid.

In this embodiment, the phase change guiding structure includes: the evaporator is contacted with the inner wall of the plate body of the vacuum cavity temperature equalizing plate, and the flow guide piece is arranged along the rising direction of the steam. Specifically, the evaporator is a porous copper mesh, and the flow guide part comprises a plurality of capillary channels. In this embodiment, the capillary channel is a copper wick.

In this embodiment, the heat dissipation principle of the vacuum chamber temperature equalization is shown in fig. 4:

1) the heat dissipated by the power device inside the AAU box body of the 5G base station is used as the heat input of the vacuum cavity temperature-equalizing plate;

2) the cooling liquid (water) is heated and quickly evaporated into hot air under the vacuum ultra-low pressure environment;

3) the hot air rapidly transfers heat under the flow guiding action of the copper core;

4) the hot air continuously rises and is condensed into liquid again when meeting the plate body part of the vacuum uniform temperature plate with lower temperature, and heat is radiated;

5) and the condensed cooling liquid flows back to an evaporation source at the bottom of the vapor chamber after being guided by the copper core, and the returned cooling liquid is heated by the evaporator and then gasified again to start the next heat transfer process.

The heat in the vacuum cavity temperature equalizing plate is conducted on a two-dimensional surface, so that the heat transfer efficiency is higher than that of a traditional linear heat transfer pipe, and the heat distribution is more uniform.

Besides explaining the heat dissipation effect of the 5G base station AAU heat dissipation system provided by the embodiment of the invention in principle, the invention also proves the heat dissipation effect of the 5G base station AAU heat dissipation system provided by the embodiment of the invention from an experimental angle. In the experimental test link, the heating sheet is adopted to simulate the actual heating condition of the AAU chip of the 5G base station, the foam box is used to simulate the heat insulation conditions of other surfaces of the AAU box body, and the thermocouple is used to monitor the temperature of the surface of the box body. And testing the heat dissipation performance of the heat dissipation system under the same gas phase condition and different heat source distribution in the daytime, and evaluating the economy and the use stability of the heat dissipation system. The experimental device comprises a box body, a heat dissipation system, a heating plate, a power supply, a battery, a thermocouple, a radiometer and the like.

As shown in table 1, three sets of experiments are designed in the first testing link of the embodiment, the first set of experiments are used for comparing the influence of the existence of the uniform temperature plate and the existence of the radiation refrigeration coating on the experiments, the second set of experiments are used for comparing the influence of the different heating area and heat dissipation area on the experiments, and the third set of experiments are used for comparing the influence of the different heating power on the experiments.

In the experimental process, the solar radiation intensity is monitored by a radiometer, the temperature of the measuring point is monitored by a thermocouple, and the temperature of the measuring point and the solar radiation intensity before the experiment and after the heating sheet starts to heat are automatically read by a data acquisition device every 30 seconds.

As shown in fig. 6: the position of the experimental heating chip of group A is shown in FIG. 6 (a), the position of the experimental heating chip of group B is shown in FIG. 6 (a), (B), and (C), and the position of the experimental heating chip of group C is shown in FIG. 6 (C). Points of the first, the second and the third on the diagonal line are taken as the measuring points of each plate.

A. B, C in the three experiments, the intensity of solar radiation at each measurement is shown in FIG. 7, the line graphs of the maximum temperature at the measurement point with the change of heating time are shown in FIG. 8, FIG. 9 and FIG. 10, respectively, and the temperature distribution of the experiments in group A without and with the uniform temperature plate is shown in FIG. 11 and FIG. 12, respectively.

TABLE 1 simulation experiment grouping

As shown in FIG. 8, in the A-group experiment, the average value of the solar radiation intensity was 921W/m²The ambient temperature averaged 41.8 ℃. When other conditions are determined, the highest temperature of the measuring point with the coating is averagely lower than that of the measuring point without the coating by 14.1 ℃, so that the coating has better temperature reductionAnd (5) effect. However, as shown in fig. 11 and 12, only the aluminum plate with the coating has a large local temperature rise, the temperature equalization plate greatly reduces the local temperature rise of the aluminum plate with the coating, and the highest temperature of the measuring point with the temperature equalization plate is 5.2 ℃ lower than the average value of the highest temperatures of the measuring points without the temperature equalization plate, so that the temperature equalization plate has a good temperature equalization and reduction effect. When the heating power is 8W, the highest temperature of the measuring point of the aluminum plate is 22.7 ℃ higher than the ambient temperature on average, the highest temperature of the measuring point of the aluminum plate with the temperature equalizing plate and the coating is 3.4 ℃ higher than the ambient temperature on average, and the coating and the temperature equalizing plate have good heat dissipation performance, so that the temperature of the outer surface of the box body is close to the ambient temperature.

As shown in FIG. 9, in the B-group experiment, the average value of the solar radiation intensity was 903W/m²The ambient temperature averaged 41.7 ℃. When other conditions are fixed, the experiment is less influenced by different ratios of the heating area to the heat dissipation area, and the temperature equalizing plate has a better temperature equalizing effect.

As shown in FIG. 10, in the experiment of group C, the average value of the solar radiation intensity was 919W/m²The ambient temperature averaged 39.1 ℃. And under other conditions, the highest temperature of the measuring point is increased along with the increase of the heating power. But under the condition of higher power, the temperature is higher, the radiation heat exchange quantity is more (the radiation heat exchange quantity is in direct proportion to the fourth power of the temperature), and the temperature rise rate is lower. Therefore, when the heating powers are respectively 5W, 10W and 15W, the differences between the highest temperature of the measuring points of the aluminum plate with the uniform temperature plate and the coating and the ambient temperature are respectively 5.8 ℃, 8.4 ℃ and 11.0 ℃, the temperature rise corresponding to the same increase of the heating power is reduced, and the temperature reduction effect of the coating is more obvious when the heating power is high.

In summary, the heat dissipation system composed of the temperature equalization plate and the radiation refrigeration coating can better realize that the heat generated by the internal working element is uniformly dispersed to the outer box body and the heat dissipation is effectively completed.

Compared with the traditional heat dissipation tooth heat dissipation system, the 5G base station AAU heat dissipation system provided by the embodiment of the invention has the advantages that the good heat dissipation effect is realized, the safety and the reliability of equipment operation are further ensured, the weight of the 5G base station AAU is greatly reduced, the total volume of the 5G base station AAU is reduced, and a large amount of working hours are saved for base station installation engineering.

Aiming at the 5G base station AAU heat dissipation system, the embodiment of the invention also provides a radiation refrigeration coating, and the radiation refrigeration coating brings more excellent heat dissipation performance to the 5G base station AAU heat dissipation system. Specifically, the radiation refrigeration coating provided by the embodiment of the invention is prepared by the following method:

applying a coating containing a photocrosslinker to the base layer; then curing for 15min by using ultraviolet light; and finally drying the coating in an environment at 60 ℃ until no water vapor exists on the surface of the coating, thereby obtaining the radiation refrigeration coating. Because the coating contains the photoinitiator, the crosslinking of the components in the coating can be promoted through ultraviolet light curing, and the mechanical strength of the radiation refrigeration coating is improved.

In other embodiments, the UV curing time may be 5-30min and the drying environment may be 20-80 ℃.

Referring to fig. 13, the radiation-cooled coating provided by the embodiment of the present invention has a wider infrared emission spectrum (4-20um), which is different from the narrower infrared emission spectrum (8-13um) of the conventional radiation-cooled coating. The wide spectrum emissivity is more favorable for radiating the surface of the 5G base station AAU. In order to further prove the heat dissipation effect of the radiation refrigeration coating provided by the embodiment, the inventor performs heat dissipation numerical simulation analysis on the infrared emission spectra with the two widths, and the analysis result can visually show that the wide infrared emission spectrum of the radiation refrigeration coating of the embodiment can reduce the maximum temperature and the average temperature of the coating by tens of degrees.

In the embodiment of the invention, the coating for preparing the radiation refrigeration coating comprises the following components in percentage by mass:

28.49 percent of hollow glass microspheres, 0.87 percent of thickening agent, 4.75 percent of adhesive, 0.29 percent of photocrosslinking agent and the balance of water. Of course, in other specific embodiments, the mass percentage of the hollow glass microspheres may be selected from any value of 10% to 50%; the mass percentage of the thickening agent can be selected from any value of 0.5-5%; the mass percentage of the adhesive can be selected from any value of 0.1-10%; the mass percent of the photocrosslinking agent can be selected from any value of 0.2-0.5%.

In this example, the thickener is sodium carboxymethyl cellulose; in other specific embodiments, the thickening agent may be selected from: at least one of sodium carboxymethylcellulose, polyvinylpyrrolidone and sodium polyacrylate.

In this embodiment, the adhesive is styrene-butadiene rubber; in other specific embodiments, the adhesive may be selected from: at least one of styrene-butadiene rubber, aqueous polyurethane and ethylene-vinyl acetate copolymer.

In this embodiment, the photocrosslinker comprises polyethylene glycol dimethacrylate and photoinitiator 1173; in other embodiments, the photoinitiator may be replaced with other similar products.

Specifically, the preparation method of the coating in this example is as follows:

step S1, adding the thickening agent into water, heating to 50-90 ℃, and stirring for 1-2h to obtain a mixture A; specifically, 1g of sodium carboxymethylcellulose is decomposed in 75g of water, and the mixture is stirred at the high temperature of 80 ℃ for 1 to 2 hours to form uniform dispersion;

step S2, adding the hollow glass microspheres into the mixture A, and stirring until white slurry is formed to obtain a mixture B; specifically, 14g of the mixture A is taken, 6g of hollow glass microspheres are added into the mixture A, and the mixture A is mixed and stirred to form white slurry;

step S3, adding the adhesive into the mixture B, and uniformly mixing to obtain a mixture C; specifically, 1g of styrene-butadiene rubber emulsion was added as a binder to the mixture B.

Step S4, adding a photocrosslinking agent into the mixture C to obtain a mixture D; operating the ultrasonic cell disruptor in the mixture D for 2-3min to enable the mixture D to generate a plurality of bubbles, and then standing for 12-24h to obtain the coating; specifically, polyethylene glycol dimethacrylate (60 mg) and photoinitiator 1173(0.6 mg) were added to mixture C; and (3) operating an ultrasonic cell disruptor in the mixture D for 2min, then adding 5g of isopropanol, and standing for 12h to obtain the coating.

The radiation refrigeration coating prepared by the coating preparation method provided by the embodiment of the invention has good mechanical properties, and specifically comprises the following steps:

(1) compared with solid glass microspheres, the hollow glass is less prone to sedimentation, so that the prepared coating has better dispersion stability, and coating components of the coating are more uniformly distributed and more attractive when the coating is coated on a coating.

(2) Because the coating has good adhesion, the coating can be directly coated on different substrates (such as acrylic plates, paper boxes and metal plates), and the radiation refrigeration coating is not easy to fall off from the substrates.

(3) The radiation refrigeration coating has good flame retardance and high-temperature stability, so that the radiation refrigeration coating provided by the embodiment of the invention is used for an AAU (architecture automation) heat dissipation system of a 5G base station, and the whole heat dissipation system is safer.

Reference throughout this specification to "some particular embodiments," "some possible embodiments," or "the invention" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in one or more embodiments of the invention. Thus, appearances of the phrases "in particular embodiments," "in some possible embodiments," or "the invention" or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.

The embodiments described above are only a part of the embodiments of the present invention, and not all of them. The components of embodiments of the present invention generally described and illustrated in the figures can be arranged and designed in a wide variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention, but is merely representative of selected embodiments of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. Moreover, all other embodiments that can be made available by a person skilled in the art without inventive step based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A5G basic station AAU cooling system which characterized in that includes: the vacuum cavity temperature equalizing plate is in contact with the inner wall of the AAU box body of the 5G base station, and the radiation refrigeration coating is in contact with the outer surface of the AAU box body of the 5G base station.

2. The 5G base station AAU heat dissipation system of claim 1, wherein the vacuum cavity temperature-uniforming plate comprises: the cooling device comprises a plate body for forming a vacuum cavity, cooling liquid positioned in the vacuum cavity and a phase change guide structure positioned in the vacuum cavity.

3. The 5G base station AAU heat dissipation system of claim 2, wherein the phase change guide structure comprises: the evaporator is contacted with the inner wall of the plate body of the vacuum cavity temperature-equalizing plate, and the flow guide piece is arranged along the rising direction of steam; the evaporator is a porous copper net, and the flow guide piece comprises a plurality of capillary pipelines.

4. The coating is used for preparing the radiation refrigeration coating of claim 1, and the coating comprises the following raw material components in percentage by mass: 10 to 50 percent of hollow glass microsphere, 0.5 to 5 percent of thickening agent, 0.1 to 10 percent of adhesive and water.

5. The coating according to claim 4, characterized in that said thickener is selected from: at least one of sodium carboxymethylcellulose, polyvinylpyrrolidone and sodium polyacrylate.

6. The coating of claim 4, wherein the binder is selected from the group consisting of: at least one of styrene-butadiene rubber, aqueous polyurethane and ethylene-vinyl acetate copolymer.

7. The coating according to claim 4, wherein the raw material components of the coating further comprise, in mass percent: 0.2% -0.5% of photocrosslinking agent; the photocrosslinking agent comprises polyethylene glycol dimethacrylate and a photoinitiator.

8. A method for preparing a coating material, for preparing the coating material of claim 7, comprising the steps of:

and step S3, adding the adhesive into the mixture B, and uniformly mixing to obtain a mixture C, thus obtaining the coating.

9. The preparation method of claim 8, further comprising a step 4 of adding a photocrosslinking agent to the mixture C to obtain a mixture D; and (3) operating the ultrasonic cell disruptor in the mixture D for 2-3min to uniformly mix the mixture D, adding isopropanol serving as a defoaming agent, and standing for 12-24h to obtain the coating.

10. A radiation-curable coating, comprising:

applying the coating of any one of claims 4-7 to a substrate layer;

drying at 20-80 deg.C until no water vapor is present on the surface of the coating, to obtain the radiation refrigeration coating.