Silver beetle multi-level micro-nano structure photothermal synergistic radiation refrigeration coating and preparation method thereof

Abstract

The application discloses an imitated silver beetle multistage micro-nano structure photon-thermal synergic radiation refrigeration coating and a preparation method thereof. The coating comprises the following components: 10-50 parts of PEEK, 50-90 parts of water glass, 1-4 parts of a surfactant, 1-6 parts of a dispersing agent, 0.1-3 parts of a defoaming agent, 1-3 parts of a thickening agent, 1-3 parts of a light stabilizer, 1-8 parts of a film forming agent and 1-3 parts of a leveling agent. Through the bionic multistage structure (nano-micro cross-scale), the PEEK-silicate composite system and the photon-thermal synergic management, the performance breakthrough of the radiation refrigeration coating is realized, the radiation refrigeration coating has the advantages of efficient cooling, strong mechanical property and long service life, and the technical blank of the organic high polymer material in the radiation refrigeration field is filled. The imitated silver beetle multistage micro-nano structure photon-thermal synergic radiation refrigeration coating of the application can still keep good cohesiveness in the range of 300-800 DEG C, and has the application prospect under high temperature conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to a radiation refrigeration material, in particular to a silver beetle imitated multistage micro-nano structure photonic-thermal synergistic radiation refrigeration coating and a preparation method thereof. BACKGROUND

[0002] Global climate warming causes continuous attention to energy problems, climate warming and increased carbon emissions make the climate deteriorate, while radiation refrigeration as a zero energy consumption and zero pollution refrigeration technology provides strong help for the problem of climate warming.

[0003] In recent years, with the continuous deepening of the exploration of nature, bionic technology has been rapidly developed and widely applied, among which, the silver beetle body surface in the tropical desert has a multistage micro-nano structure, which can realize high-efficiency reflection of solar radiation through photonic crystal effect, thereby reducing heat absorption. The silver beetle body surface structure can also realize high-efficiency thermal radiation in the mid-infrared band, thereby dissipating heat in the form of electromagnetic waves to outer space. The synergistic effect of the multistage structure enables the silver beetle to survive in the tropical desert. SUMMARY

[0004] The purpose of the present application is to provide a silver beetle imitated multistage micro-nano structure photonic-thermal synergistic radiation refrigeration coating and a preparation method thereof. Based on the nanowax protrusions on the desert silver beetle shell and the microporous base, a silver beetle imitated multistage micro-nano structure photonic-thermal synergistic radiation refrigeration coating is prepared by using silicate resin combined with PEEK. During the curing process, the PEEK particles form an ordered arrangement through self-assembly, and the gaps between the particles form nanoholes, thereby causing the PEEK particles to aggregate to form micro-nano level protrusions in the network structure of water glass. The multistage structure of nanoholes and microporous protrusions realizes high-efficiency visible light reflection and mid-infrared emission through photonic crystal effect and thermal radiation regulation. Therefore, the coating can realize cooling through the synergistic effect of photonic scattering (solar light reflection) and thermal radiation (infrared emission), highlighting the cross-scale energy management strategy. In addition, the coating has good adhesion in high temperature environment, ensuring that the coating can still function normally in high temperature environment.

[0005] The purpose of the present application is realized by the following technical scheme:

[0006] A silver beetle imitated multistage micro-nano structure photonic-thermal synergistic radiation refrigeration coating comprises the following components in mass fraction: 10-50 parts of PEEK, 50-90 parts of water glass, 1-4 parts of surfactant, 1-6 parts of dispersing agent, 0.1-3 parts of defoaming agent, 1-3 parts of thickening agent, 1-3 parts of light stabilizer, 1-8 parts of film forming agent, and 1-3 parts of leveling agent, wherein:

[0007] The water glass is prepared by hydrolysis of silicate powder and distilled water under high temperature conditions, and the preparation conditions are as follows: hydrolysis for 60-200 min at a temperature of 40-70 DEG C with an auxiliary agent, and the mass ratio of the silicate powder to the distilled water is 1:1-2; the silicate is one or more of sodium silicate, potassium silicate, calcium silicate, lithium silicate and ammonium silicate;

[0008] The surfactant is one or more of TEOS (tetraethyl orthosilicate), CTAB (cetyltrimethylammonium bromide), DTAB (dodecyltrimethylammonium bromide), AEO (fatty alcohol polyoxyethylene ether) and SDS (sodium dodecyl sulfate);

[0009] The dispersant is a PEG dispersant, preferably one or more of PEG-400, PEG-600, PEG-6000 and PEG-8000, and the specific preparation method is as follows: one or more of PEG-400, PEG-600, PEG-6000 and PEG-8000 is mixed with deionized water at a mass ratio of 1:1-2, stirred at room temperature for 5 min, and ultrasonically dispersed for 5 min to obtain the PEG dispersant;

[0010] The film-forming agent is one or more of ethylene glycol, alcohol ester-12 and propylene glycol butyl ether;

[0011] The defoaming agent is organic silicon 817 defoaming agent;

[0012] The leveling agent is Zhongke Hongtai K-400;

[0013] The thickening agent is one or more of hydroxyethyl cellulose, Carbomer 930 and nano-SiO2, and the specific preparation method is as follows: 1-3 parts of one or more of hydroxyethyl cellulose, Carbomer 930 and nano-SiO2 are added to 100 parts of deionized water in batches, stirred at a temperature of 50 DEG C for 30 min, at a temperature of 55 DEG C for 10 min, at a temperature of 60 DEG C for 10 min, and finally ultrasonically defoamed for 15 min to obtain the thickening agent;

[0014] The light stabilizer is one or more of Jihong UV-106 and Rianlon / UV-622.

[0015] A preparation method of a silver beetle multi-level micro-nano structure photon-thermal synergistic radiation refrigeration coating, comprising the following steps:

[0016] Step one, a high-speed dispersing machine is used to add a dispersant and a surfactant in the water glass, and stirring is performed at a speed of 400-600 r / min for 3-5 min;

[0017] Step two, add thickening agent and defoaming agent, continue to stir at a speed of 400-600 r / min for 3-5 min;

[0018] Step three, increase the speed of the high-speed dispersion machine to 600-800 r / min, slowly add PEEK powder, and continuously increase the speed to 1000-1500 r / min during the adding process, and stir for 30-60 min;

[0019] Step four, reduce the speed of the high-speed dispersion machine to 600-1000 r / min, add the film forming agent and stir for 3-8 min;

[0020] Step five, add the light stabilizer and stir for 3-8 min, then add the leveling agent and stir for 8-15 min, to obtain the radiation refrigeration coating;

[0021] Step six, under the condition that the ambient temperature is 15-30 DEG C and the relative humidity of air is less than 85%, use 0.6-1.0 MPa compressed air to spray 1-5 times, and after spraying, stand at room temperature for curing, to obtain the photon-thermal synergistic radiation refrigeration coating.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] 1. The silver beetle-imitated multistage micro-nano structure photon-thermal synergistic radiation refrigeration coating of the present application realizes performance breakthrough of the radiation refrigeration coating through bionic multistage structure (nano-micron cross-scale), PEEK-silicate composite system and photon-thermal synergistic management, and has high efficient cooling, strong mechanical property and long service life, filling the technical gap of organic high polymer materials in the field of radiation refrigeration.

[0024] 2. The silver beetle-imitated multistage micro-nano structure photon-thermal synergistic radiation refrigeration coating of the present application has simple and easy-to-operate preparation process, uses the process of spraying and directly curing at room temperature, greatly improves the utilization space of the coating, and can be applied in many fields such as aviation thermal control, building energy-saving materials, solar photoelectric and photo-thermal system, power equipment, etc.

[0025] 3. The silver beetle-imitated multistage micro-nano structure photon-thermal synergistic radiation refrigeration coating of the present application breaks through the limitation of traditional refrigeration technology in the aspect of advancement, has multifunctionality and sustainability, and meets the development concept of green and low carbon.

[0026] 4. The silver beetle-imitated multistage micro-nano structure photon-thermal synergistic radiation refrigeration coating of the present application can be made into a strong infrared selective radiation refrigeration functional coating on the surface of high-reflective substrate materials such as metal and ceramic, has the advantage of zero energy consumption cooling refrigeration, and saves a large amount of energy consumption.

[0027] 5. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiation cooling coating of the present invention can still maintain good adhesion in the temperature range of 300-800℃, and has the prospect of being used under high temperature conditions. Attached Figure Description

[0028] Figure 1 These are images of the appearance of the silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating on different material surfaces, provided in Example 1.

[0029] Figure 2 The images show the appearance of the silver beetle-inspired multi-level micro / nano structure photon-thermal synergistic radiation cooling coating provided in Example 1 after 30 seconds of surface ablation with a cartridge spray gun on different material surfaces.

[0030] Figure 3 This is a SEM image (20,000x magnification) of the photonic-thermal synergistic radiation cooling coating of the silver beetle-inspired multi-level micro / nano structure provided in Example 4.

[0031] Figure 4 This is a SEM image (10000x magnification) of the photonic-thermal synergistic radiation cooling coating of the silver beetle-inspired multi-level micro / nano structure provided in Example 4.

[0032] Figure 5 These are images of nanowaxy protrusions on the shell of a silver beetle and a micron-porous substrate.

[0033] Figure 6 The infrared emission spectrum of the silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating provided in Example 1 is shown in the 2.5–16 μm band.

[0034] Figure 7 The infrared emission spectrum of the silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating provided in Example 2 is shown in the 2.5–16 μm wavelength band.

[0035] Figure 8 The infrared emission spectrum of the silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating provided in Example 3 is shown in the 2.5–16 μm band.

[0036] Figure 9 The infrared emission spectrum of the silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating provided in Example 4 is shown in the 2.5–16 μm band. Detailed Implementation

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings, but it is not limited thereto. Any modifications or equivalent substitutions to the technical solution of the present invention that do not depart from the spirit and scope of the technical solution of the present invention should be covered within the protection scope of the present invention.

[0038] The amount of raw materials used in the following examples is mass fraction.

[0039] Example 1

[0040] The present embodiment provides a preparation method of a silver beetle multi-level micro-nano structure photothermal synergistic radiation refrigeration coating, which comprises the following steps:

[0041] Step one, sodium silicate and distilled water are added to a single-neck flask in a mass ratio of 1:1.5, a reaction aid is added, hydrolysis is carried out at a temperature of 60℃ for 60 min, and after hydrolysis at 70℃ to a suitable viscosity, cooling is carried out to obtain water glass. A high-speed dispersion machine is used to add 2 parts of PEG-6000 dispersant and 1 part of DTAB surfactant in 90 parts of water glass, and stirring is carried out at a speed of 500 r / min for 3 min for dissolution.

[0042] Step two, 1 part of hydroxyethyl cellulose thickening agent and 0.3 parts of 817 defoaming agent are added, and stirring is continued at a speed of 500 r / min for 5 min for dissolution.

[0043] Step three, the speed of the high-speed dispersion machine is increased to 700 r / min, 15 parts of PEEK powder are slowly added, the speed is continuously increased to 1250 r / min during the adding process, and stirring is continued for 40 min to realize uniform dispersion.

[0044] Step four, the speed of the high-speed dispersion machine is reduced to 800 r / min, and 2 parts of alcohol ester-12 film forming agent are immediately added, and stirring is continued for 5 min to realize uniform dispersion.

[0045] Step five, 3 parts of UV-106 light stabilizer are added, and stirring is continued for 5 min to realize uniform dispersion, 1 part of leveling agent K-400 is added, and stirring is continued for 10 min to realize uniform dispersion, and a photothermal synergistic radiation refrigeration coating is obtained.

[0046] Step six, under the condition that the ambient temperature is 15-30℃ and the relative humidity of air is less than 85%, 0.8 MPa compressed air is sprayed twice, and after spraying, room temperature curing is carried out, and a photothermal synergistic radiation refrigeration coating is obtained. The performance index of the obtained coating is shown in Table 1.

[0047] Table 1

[0048] Index Value Test Index Reflectance 0.94 ASTM / C1549-09(2014) Infrared emissivity 0.94 GB / T6040-2019 High temperature resistance ≤800 HG / T4565-2013 Refrigeration performance 5～10℃ GB / T4893.7-1985

[0049] It can be seen that the coating can be perfectly coated on the ceramic sheet and the metal sheet, and the integrity and the adhesion of the coating are good; it can be seen from Figure 1 that after ablation for 30 s by a cartridge spray gun, the coating can still be perfectly attached to the ceramic sheet and the metal sheet, and the adhesion is good; it can be seen from Figure 2 that the coating can be perfectly coated on the ceramic sheet and the metal sheet, and the integrity and the adhesion of the coating are good; it can be seen from Figure 6It can be seen that the average emissivity of the coating in the atmospheric window (8-14 μm) band is 93.62%, far exceeding the traditional coating (~85%), and the performance is excellent.

[0050] Example 2

[0051] The embodiment provides a preparation method of a silver beetle multi-level micro-nano structure photothermal synergistic radiation refrigeration coating, and the method comprises the following steps:

[0052] Step one, sodium silicate and distilled water are added to a single-neck flask in a mass ratio of 1:1.5, a reaction aid is added, hydrolysis is carriedied out at a temperature of 60 DEG C for 60 min, and after hydrolysis at 70 DEG C to a suitable viscosity, the water glass is obtained by cooling. A high-speed dispersion machine is used to add 2 parts of PEG-6000 dispersant and 1 part of DTAB surfactant in 90 parts of water glass, and stirring is carriedied out at a speed of 500 r / min for 3 min for dissolution.

[0053] Step two, 1 part of hydroxyethyl cellulose thickening agent and 0.3 parts of 817 defoaming agent are added, and stirring is carriedied out at a speed of 500 r / min for 5 min for dissolution.

[0054] Step three, the speed of the high-speed dispersion machine is increased to 700 r / min, 15 parts of PEEK powder are slowly added, the speed is continuously increased to 1250 r / min during the adding process, and the dispersion system is continuously stirred for 40 min to realize uniform dispersion.

[0055] Step four, the speed of the high-speed dispersion machine is reduced to 800 r / min, and then 2 parts of ethylene glycol film forming agent are added and continuously stirred for 5 min to realize uniform dispersion.

[0056] Step five, 3 parts of UV-106 light stabilizer are added and continuously stirred for 5 min to realize uniform dispersion, and then 1 part of leveling agent K-400 is added and stirred for 10 min to realize uniform dispersion, so that the photothermal synergistic radiation refrigeration coating is obtained.

[0057] Step six, under the condition that the ambient temperature is 15-30 DEG C and the relative humidity of air is less than 85%, 0.8 MPa compressed air is sprayed twice, and then the photothermal synergistic radiation refrigeration coating is obtained after room temperature curing. The performance index of the obtained coating is shown in Table 2.

[0058] Table 2

[0059] Index Value Test Index Reflectance 0.95 ASTM / C1549-09(2014) Infrared emissivity 0.94 GB / T6040-2019 High temperature resistance ≤800 HG / T4565-2013 Refrigeration performance 5～10℃ GB / T4893.7-1985

[0060] By Figure 7 It can be seen that the average emissivity of the coating in the atmospheric window (8-14 μm) band is 94.53%, far exceeding the traditional coating (~85%), and the performance is excellent.

[0061] Example 3

[0062] This embodiment provides a method for preparing a multi-level micro / nano structure photonic-thermal synergistic radiation-cooling coating inspired by silver beetles. The method includes the following steps:

[0063] Step 1: Add sodium silicate and distilled water to a single-necked flask at a mass ratio of 1:1.5, add reaction aids, and hydrolyze at 60℃ for 60 min, then at 70℃ until a suitable viscosity is reached. After cooling, water glass is obtained. Dissolve 2 parts PEG-6000 dispersant and 1 part CTAB surfactant in 90 parts of water glass using a high-speed disperser, stirring at 500 rpm for 3 min.

[0064] Step 2: Add 1 part hydroxyethyl cellulose thickener and 0.3 parts 817 defoamer and continue stirring at 500 r / min for 5 min to dissolve.

[0065] Step 3: Increase the speed of the high-speed disperser to 700 r / min, slowly add 15 parts of PEEK powder, and continuously increase the speed to 1250 r / min during the addition process. Continue to stir the dispersion system for 40 minutes to achieve uniform dispersion.

[0066] Step 4: Reduce the speed of the high-speed disperser to 800 r / min, then add 2 parts of alcohol ester-12 film-forming agent and continue stirring for 5 minutes to achieve uniform dispersion.

[0067] Step 5: Add 3 parts of UV-106 light stabilizer and continue stirring for 5 minutes to achieve uniform dispersion. Then add 1 part of leveling agent K-400 and stir for 10 minutes to achieve uniform dispersion, thus obtaining the photon-thermal synergistic radiation cooling coating.

[0068] Step 6: Under conditions of ambient temperature of 15–30℃ and relative humidity below 85%, spray twice with 0.8MPa compressed air. After spraying, allow to cure at room temperature to obtain the photon-thermal synergistic radiation cooling coating. The performance indicators of the obtained coating are shown in Table 3.

[0069] Table 3

[0070]

[0071]

[0072] Depend on Figure 8 It can be seen that the coating has an average emissivity of 93.62% in the atmospheric window (8-14μm) band, which is far superior to that of traditional coatings (~85%), demonstrating excellent performance.

[0073] Example 4

[0074] This embodiment provides a method for preparing a multi-level micro / nano structure photonic-thermal synergistic radiation-cooling coating inspired by silver beetles. The method includes the following steps:

[0075] Step 1: Add sodium silicate and distilled water to a single-necked flask at a mass ratio of 1:1.5, add reaction aids, and hydrolyze at 60℃ for 60 min, then at 70℃ until a suitable viscosity is reached. After cooling, water glass is obtained. Dissolve 2 parts PEG-6000 dispersant and 1 part CTAB surfactant in 90 parts of water glass using a high-speed disperser, stirring at 500 rpm for 3 min.

[0076] Step 2: Add 1 part hydroxyethyl cellulose thickener and 0.3 parts 817 defoamer and continue stirring at 500 r / min for 5 min to dissolve.

[0077] Step 3: Increase the speed of the high-speed disperser to 700 r / min, slowly add 15 parts of PEEK powder, and continuously increase the speed to 1250 r / min during the addition process. Continue to stir the dispersion system for 40 minutes to achieve uniform dispersion.

[0078] Step 4: Reduce the speed of the high-speed disperser to 800 r / min, then add 2 parts of ethylene glycol film-forming agent and continue stirring for 5 minutes to achieve uniform dispersion.

[0079] Step 5: Add 3 parts of UV-106 light stabilizer and continue stirring for 5 minutes to achieve uniform dispersion. Then add 1 part of leveling agent K-400 and stir for 10 minutes to achieve uniform dispersion, thus obtaining the photon-thermal synergistic radiation cooling coating.

[0080] Step 6: Under conditions of ambient temperature of 15–30℃ and relative humidity below 85%, spray twice with 0.8MPa compressed air. After spraying, allow to cure at room temperature to obtain the photon-thermal synergistic radiation cooling coating. The performance indicators of the obtained coating are shown in Table 4.

[0081] Table 4

[0082] Index Value Test Index Reflectance 0.94 ASTM / C1549-09(2014) Infrared emissivity 0.94 GB / T6040-2019 High temperature resistance ≤800 HG / T4565-2013 Refrigeration performance 5～10℃ GB / T4893.7-1985

[0083] Depend on Figure 9 It can be seen that the coating has an average emissivity of 94.31% within the atmospheric window (8–14 μm) band, far exceeding that of traditional coatings (~85%), demonstrating superior performance. From Figure 3 , Figure 4 and Figure 5It can be seen that the microstructure on the coating presents densely arranged concave-convex units, which is highly similar to the micron-scale scales and nanometer-scale holes of the silver beetle shell. Both of them can increase the surface area and destroy the surface smoothness, enhance the radiation emission efficiency in the mid-infrared band (8-14 μm), and at the same time scatter short-wave solar light to reduce heat absorption.

[0084] Example 5

[0085] The embodiment provides a preparation method of a silver beetle-imitated multilevel micro-nano structure photothermal synergistic radiation refrigeration coating, and the method comprises the following steps:

[0086] Step one, potassium silicate and distilled water are added into a single-necked flask in a mass ratio of 1:1.5, a reaction aid is added, hydrolysis is carried out at 60 DEG C for 60 min, and after hydrolysis at 70 DEG C until a proper viscosity is obtained, the water glass is prepared by cooling. A high-speed dispersion machine is used to add 3.5 parts of PEG-8000 dispersant and 2 parts of TEOS surfactant in 60 parts of water glass, and stirring is carried out at a speed of 500 r / min for 3 min to dissolve.

[0087] Step two, 2 parts of nano-SiO2 thickening agent and 1.5 parts of 817 defoaming agent are added, and stirring is continuously carried out at a speed of 500 r / min for 5 min to dissolve.

[0088] Step three, the speed of the high-speed dispersion machine is increased to 700 r / min, 45 parts of PEEK powder are slowly added, the speed is continuously increased to 1250 r / min during the adding process, and the dispersion system is continuously stirred for 40 min to realize uniform dispersion.

[0089] Step four, the speed of the high-speed dispersion machine is reduced to 800 r / min, 5 parts of propylene glycol butyl ether film forming agent are added, and stirring is continuously carried out for 5 min to realize uniform dispersion.

[0090] Step five, 1 part of UV-106 light stabilizer is continuously added, stirring is carried out for 5 min to realize uniform dispersion, 3 parts of leveling agent K-400 are added, and stirring is carried out for 10 min to realize uniform dispersion, so that the photothermal synergistic radiation refrigeration coating is obtained.

[0091] Step six, under the condition that the ambient temperature is 15-30 DEG C and the relative humidity of air is less than 85%, 0.8 MPa compressed air is sprayed twice, and after spraying, the photothermal synergistic radiation refrigeration coating is obtained by room temperature curing.

[0092] Example 6

[0093] The embodiment provides a preparation method of a silver beetle-imitated multilevel micro-nano structure photothermal synergistic radiation refrigeration coating, and the method comprises the following steps:

[0094] Step one, add calcium silicate and distilled water into a single-necked flask according to the mass ratio of 1:1.5, add reaction aids, hydrolyze at 60℃ for 60 min, cool after hydrolyzing at 70℃ until the viscosity is appropriate, and then water glass is obtained. Add 5 parts of PEG-400 dispersant and 3 parts of AEO surfactant into 75 parts of water glass, and stir at a speed of 500 r / min for 3 min to dissolve.

[0095] Step two, add 3 parts of Carbomer 930 thickener and 2.5 parts of 817 antifoaming agent, and continue to stir at a speed of 500 r / min for 5 min to dissolve.

[0096] Step three, increase the speed of the high-speed disperser to 700 r / min, slowly add 30 parts of PEEK powder, and increase the speed to 1250 r / min during the adding process, continue to stir the dispersion system for 40 min to achieve uniform dispersion.

[0097] Step four, reduce the speed of the high-speed disperser to 800 r / min, then add 7 parts of alcohol ester-12 film forming agent, and continue to stir for 5 min to achieve uniform dispersion.

[0098] Step five, add 2 parts of UV-622 light stabilizer, continue to stir for 5 min to achieve uniform dispersion, then add 2 parts of leveling agent K-400, and stir for 10 min to achieve uniform dispersion, and then a photonic-thermal synergistic radiation refrigeration coating is obtained.

[0099] Step six, under the conditions of ambient temperature of 15-30℃ and relative humidity of air less than 85%, use 0.8 MPa compressed air to spray twice, and then stand at room temperature for curing after spraying, and then a photonic-thermal synergistic radiation refrigeration coating is obtained.

Claims

1. A multi-level micro / nano structured photonic-thermal synergistic radiative cooling coating in the shape of a silver beetle, characterized in that... The coating comprises the following components in parts by weight: 10-50 parts PEEK, 50-90 parts water glass, 1-4 parts surfactant, 1-6 parts dispersant, 0.1-3 parts defoamer, 1-3 parts thickener, 1-3 parts light stabilizer, 1-8 parts film-forming agent, and 1-3 parts leveling agent. The specific preparation method of the coating is as follows: Step 1: Add dispersant and surfactant to water glass using a high-speed disperser and stir at 400-600 r / min for 3-5 min. Step 2: Add thickener and defoamer, and continue stirring at 400~600 r / min for 3~5 min; Step 3: Increase the speed of the high-speed disperser to 600~800 r / min, slowly add PEEK powder, and continuously increase the speed to 1000~1500 r / min during the addition process, and stir for 30~60 min; Step 4: Reduce the speed of the high-speed disperser to 600~1000 r / min, add the film-forming agent and stir for 3~8 min; Step 5: Add light stabilizer and stir for 3-8 minutes, then add leveling agent and stir for 8-15 minutes to obtain radiation cooling coating; Step 6: Under the conditions of ambient temperature of 15~30℃ and relative humidity of air below 85%, spray 1~5 times with compressed air of 0.6~1.0MPa. After spraying, let it stand at room temperature to cure, and the photon-thermal synergistic radiation cooling coating is obtained.

2. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The water glass is prepared by hydrolyzing silicate powder and distilled water under high temperature conditions. The hydrolysis temperature is 40~70℃ and the hydrolysis time is 60~200min. The mass ratio of silicate powder to distilled water is 1:1~2. The silicate is one or more of sodium silicate, potassium silicate, calcium silicate, lithium silicate, and ammonium silicate.

3. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The surfactant is one or more of TEOS, CTAB, DTAB, AEO, and SDS.

4. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The dispersant is a PEG dispersant.

5. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 4, characterized in that... The PEG dispersant is one or more of PEG-400, PEG-600, PEG-6000, and PEG-8000.

6. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The film-forming agent is one or more of ethylene glycol, alcohol ester-12, and propylene glycol butyl ether.

7. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The defoamer is silicone 817 defoamer, and the leveling agent is K-400.

8. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The thickener is one or more of hydroxyethyl cellulose, Carbomer 930, and nano-SiO2.

9. The silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiative cooling coating according to claim 1, characterized in that... The light stabilizer is one or both of UV-106 and UV-622.

10. A method for preparing the silver beetle-inspired multi-level micro / nano structure photonic-thermal synergistic radiation cooling coating according to any one of claims 1-9, characterized in that... The method includes the following steps: Step 1: Add dispersant and surfactant to water glass using a high-speed disperser and stir at 400-600 r / min for 3-5 min. Step 2: Add thickener and defoamer, and continue stirring at 400~600 r / min for 3~5 min; Step 3: Increase the speed of the high-speed disperser to 600~800 r / min, slowly add PEEK powder, and continuously increase the speed to 1000~1500 r / min during the addition process, and stir for 30~60 min; Step 4: Reduce the speed of the high-speed disperser to 600~1000 r / min, add the film-forming agent and stir for 3~8 min; Step 5: Add light stabilizer and stir for 3-8 minutes, then add leveling agent and stir for 8-15 minutes to obtain radiation cooling coating; Step 6: Under the conditions of ambient temperature of 15~30℃ and relative humidity of air below 85%, spray 1~5 times with compressed air of 0.6~1.0MPa. After spraying, let it stand at room temperature to cure, and the photon-thermal synergistic radiation cooling coating is obtained.

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