Preparation method of super-amphiphobic radiation cooling material

Abstract

The application discloses a kind of super double-soluble radiation refrigeration material preparation method, the method includes the following steps: polyvinyl fluoride-hexafluoropropylene is dissolved in acetone after adding alumina dispersion liquid to obtain radiation refrigeration material base fluid;Isopropanol, water, silicon dioxide are mixed to prepare A liquid, tetraethyl orthosilicate, hydrochloric acid, ethanol are mixed to prepare B liquid, after A liquid and B liquid are mixed, super double-soluble spraying liquid is prepared;Radiation refrigeration material base fluid is obtained by using blade coating method to obtain radiation refrigeration base material, and super double-soluble spraying liquid is sprayed onto radiation refrigeration base material by spraying method to obtain super double-soluble radiation refrigeration material.The super double-soluble radiation refrigeration material prepared by the application has 99% reflectivity in the solar wave band, 97% emissivity in the atmospheric window, can cause 5℃ sub-environmental temperature drop under hot weather (≈35℃), has high reflectivity and high emissivity at the same time, has excellent self-cleaning liquid-repellent performance, so that it has good weather resistance in complex environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radiative cooling materials and superamphiphobic materials, and in particular to a preparation method of superamphiphobic radiative cooling materials. BACKGROUND

[0002] In recent years, global warming has led to a continuous rise in the temperature of the earth, and the urban heat island effect has intensified, especially in hot summer, strong solar radiation causes the ground temperature to rise sharply, intensifying human dependence on power systems such as air conditioners, greatly increasing energy consumption and generating a large amount of greenhouse gas emissions, intensifying climate change and global warming. Therefore, the development of more environmentally friendly and energy-saving refrigeration technology is of great significance to alleviate the energy crisis and climate change.

[0003] Zero-energy, zero-pollution passive daytime radiative cooling (PDRC) is considered to be one of the most feasible solutions to replace traditional electric cooling. According to the second law of thermodynamics, heat will always spontaneously transfer from the surface of a high-temperature object to the surface of a low-temperature object, and this process is irreversible. There are three forms of heat transfer in nature, including thermal conduction, thermal convection, and thermal radiation. Thermal radiation is fundamentally generated by energy level transitions of matter, and for any object with a temperature greater than 0K, thermal radiation can be achieved by emitting electromagnetic waves. Radiative cooling materials can efficiently reflect solar light with a wavelength of 0.3-2.5 μm, and can emit their own heat in the form of electromagnetic waves through the "atmospheric transparent window" of 8-13 μm to the cold outer space (3K), thereby achieving a zero-energy cooling method.

[0004] However, these radiative cooling materials are easily contaminated by dust and pollutant particles due to surface wettability, resulting in low solar spectrum reflectivity and reduced thermal emissivity, which seriously affects their radiative cooling performance. Radiative cooling materials with only superhydrophobic self-cleaning properties are still easily contaminated by low-surface-energy pollutants in the actual environment, such as oil stains, bird droppings, etc., and low-surface-energy pollutants even cause temperature rise due to high solar spectrum absorption, causing the radiative cooling material to lose its cooling performance. In order to make the radiative cooling material superamphiphobic to most low-surface-energy pollutants in complex environments, it is urgent to design a good daytime radiative cooling material with superamphiphobic properties and excellent weather resistance in complex environments. SUMMARY

[0005] In order to overcome the problems existing in the prior art, the present application proposes a preparation method of superamphiphobic radiative cooling materials, which is simple and efficient, low in cost, good in performance, and can be mass-produced. The prepared material has high reflectivity and high emissivity, excellent self-cleaning and liquid-repellent properties, and good weather resistance in complex environments, and solves the problems of low reflectivity and poor self-cleaning performance of radiative cooling materials.

[0006] To achieve the above object, the technical scheme adopted by the present application is:

[0007] The present application provides a preparation method of super-biphobic radiation refrigeration material, comprising the following steps:

[0008] (1) polyvinylidene fluoride-hexafluoropropylene is dissolved in acetone, and then alumina dispersion liquid is added to prepare a radiation refrigeration material base solution;

[0009] (2) isopropanol, water and silicon dioxide are mixed to prepare A liquid, tetraethyl orthosilicate, hydrochloric acid and ethanol are mixed to prepare B liquid, and the A liquid and the B liquid are mixed to prepare a super-biphobic spraying solution;

[0010] (3) the radiation refrigeration material base solution is obtained by using a scraping method, and the super-biphobic spraying solution is sprayed onto the radiation refrigeration base material to obtain a super-biphobic radiation refrigeration material.

[0011] Preferably, the mass fraction of alumina in the alumina dispersion liquid is 4-6wt%, and the dispersion medium is ethanol and ultrapure water in a mass ratio of 1:(0.5-1.5); further preferably, the mass fraction of alumina in the alumina dispersion liquid is 5wt%, and the dispersion medium is ethanol and ultrapure water in a mass ratio of 1:1.

[0012] Preferably, the mass ratio of polyvinylidene fluoride-hexafluoropropylene, acetone and the dispersion medium of the alumina dispersion liquid is 2:7:(3-5); further preferably, the mass ratio of polyvinylidene fluoride-hexafluoropropylene, acetone and the dispersion medium of the alumina dispersion liquid is 2:7:4.

[0013] Preferably, the particle size of alumina particles in the alumina dispersion liquid is 250-350nm; the particle size of silicon dioxide is 25-35nm; further preferably, the particle size of alumina particles in the alumina dispersion liquid is 280-320nm; the particle size of silicon dioxide is 28-32nm.

[0014] Preferably, the content of silicon dioxide in the A liquid is 1-10wt%, the content of tetraethyl orthosilicate in the B liquid is 50-60wt%, and the mass ratio of the A liquid to the B liquid is 1:(0.3-0.7).

[0015] Preferably, in step (3), the scraping parameters of the scraping method are 30cm / min, and the scraping distance is 20cm.

[0016] Preferably, in step (3), the spraying method is as follows: the super-amphiphobic spraying solution is placed under a pressure of 0.3-0.5 MPa, the radiative cooling substrate is first placed on a hot stage at 65℃ for heating for 5 minutes, then the spray pen is adjusted to a distance of 15 cm from the surface of the radiative cooling substrate, the angle of the spray pen is 60° with the surface of the radiative cooling substrate, and the solution is sprayed on the surface of the substrate.

[0017] Preferably, in step (3), the spraying amount of the super-amphiphobic spraying solution on the radiative cooling substrate per square centimeter is 0.1-0.2 g.

[0018] Preferably, after the super-amphiphobic radiative cooling material is prepared in step (3), surface fluorosilane modification is performed by vapor deposition, and finally washing and drying are performed.

[0019] Further preferably, the fluorosilane material used in the surface fluorosilane modification comprises 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane.

[0020] After vapor deposition fluorination, long-chain fluorosilane is grafted to achieve super-amphiphobic effect, the large pores of the substrate make the performance better, secondly, the 30 nm silicon oxide nanoparticles and hydrolyzed tetraethyl silicate increase the reflectivity and infrared emissivity of the base film and the whole to sunlight, the large pore structure of the substrate film makes the super-amphiphobic structure more stable and long-term effective, and the two functional layers complement each other.

[0021] Further preferably, the surface fluorosilane modification is as follows: the super-amphiphobic radiative cooling material after spraying is placed in a sealed environment together with an open container, then 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane is dropped into the container, vacuum is drawn, and the super-amphiphobic radiative cooling material is left to stand at room temperature for 10-20 min in the vacuum sealed environment.

[0022] The second aspect of the present application provides a super-amphiphobic radiative cooling material, which is prepared by the preparation method of the super-amphiphobic radiative cooling material.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The ratio among the non-solvent water, ethanol and aluminum oxide and the selection of the particle size of the aluminum oxide are the key to the high performance of the radiative cooling material, and such a process can make the casting solution form a uniformly dispersed porous structure.

[0025] The porous structure of the substrate film of the application mainly plays a role of high reflectivity (radiative cooling function); the super-amphiphobic mechanism of the application is that the hydrolyzed tetraethyl silicate forms a convex multi-pore structure with the silicon oxide nanoparticles, and after fluorination by vapor deposition, long-chain fluorosilane is grafted to achieve super-amphiphobic effect, wherein the most critical process is the amount of b liquid (tetraethyl silicate, isopropyl alcohol, ethanol, hydrochloric acid), the b liquid controls the morphology of the entire super-amphiphobic process, including the final super-amphiphobic performance and mechanical performance.

[0026] The super-amphiphobic radiative cooling material prepared by the application has 99% reflectivity in the solar wave band and 97% emissivity in the atmospheric window, can cause a 5℃ sub-environmental temperature drop under hot weather (about 35℃), has high reflectivity and high emissivity at the same time, has excellent self-cleaning and liquid-repellent performance, has good weather resistance in complex environments, and the super-amphiphobic radiative cooling material combining radiative cooling and super-amphiphobic self-cleaning properties is expected to realize extended production and can be used for buildings, vehicles and other ground objects, and has important significance for relieving energy crisis and climate change. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A modeling diagram of the super-amphiphobic radiative cooling material;

[0028] Figure 2 A physical diagram of the super-amphiphobic radiative cooling material;

[0029] Figure 3 An SEM diagram of the super-amphiphobic radiative cooling material;

[0030] Figure 4 An SEM diagram of the super-amphiphobic radiative cooling material sprayed on a glass substrate;

[0031] Figure 5 A solar spectrum reflectivity and infrared emissivity diagram of the super-amphiphobic radiative cooling material;

[0032] Figure 6 A contact angle data diagram of the super-amphiphobic radiative cooling material;

[0033] Figure 7 A pore size distribution diagram of the super-amphiphobic radiative cooling material;

[0034] Figure 8 A group of outdoor temperature test diagrams;

[0035] Figure 9 Influence of different B liquid addition amounts on CA and SA;

[0036] Figure 10 Influence of different B liquid addition amounts on mechanical performance;

[0037] Figure 11Effects of different silica solid contents on CA and SA. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be further described below. It should be noted that the description of these embodiments is intended for the purpose of aiding in the understanding of the present application and is not intended to be limiting of the present application. Moreover, unless otherwise defined, technical terms such as those concerning chemical structures, formulas, and the like, used in the description of the various embodiments of the present application described below are intended to refer to the terms as are well known to one of ordinary skill in the art.

[0039] The experimental methods used in the following examples are all conventional methods unless otherwise specified. The test materials used in the following examples are all commercially available unless otherwise specified.

[0040] The test methods used in the following examples are as follows:

[0041] 1) Real object image shooting: using a mobile phone front camera to shoot.

[0042] 2) Reflectivity and emissivity testing: UV spectrophotometer model Hitachi UH5700, testing reflectivity in the 200-3000 nm wavelength range, infrared emission model INVENIO R, resolution 4 cm-1, 32 scans, scanning wavelength range 2.5 μm-25 μm, testing material infrared emissivity.

[0043] 3) Surface topography analysis: surface topography of the layer is photographed by scanning electron microscope model Thermo Fisher Axia, and the material surface microstructure pore size is counted by imagej.

[0044] 4) Wettability: static contact angle is measured by DataPhysics OC20 goniometer at different positions of each sample for 3-5 times, and the rolling angle is measured by an adjustable angle inclined table.

[0045] 5) Outdoor refrigeration effect testing: the testing device is a separate small car model, and three groups of comparative tests are carried out using super-amphiphobic radiation refrigeration materials, commercial cloth wrapping, and no wrapping respectively, the thermocouples are placed in the grooves covered by the samples, and the multi-channel temperature tester AT4208 is used to record the refrigeration temperature and air temperature of the samples. Power meter TES-1333R is used to test the solar power synchronously. Humidity thermometer TP500 is used to record the real-time changes of temperature and humidity of the environment.

[0046] 6) Sand abrasion test: By placing the sample on a 45° inclined table, the sample is impacted by a series of sand grains of controlled height and mass, after the impact, the contact angle and rolling angle are measured by a DataPhysics OC20 goniometer at different positions of each sample, the rolling angle is measured by an adjustable angle inclined table, the mechanical properties of the material are determined by the contact angle and the rolling angle.

[0047] Example 1

[0048] This example explores the effect of the content of B liquid on the super-amphiphobic properties.

[0049] The preparation of the super-amphiphobic radiative cooling material includes the following steps:

[0050] (1) Take 2 g of vinylidene fluoride-hexafluoropropylene and add it to 7 g of acetone, stir until uniform, then ultrasonic for 30 min to form a uniform dispersion.

[0051] (2) Add a non-solvent containing 5 wt% of 300 nm aluminum oxide dispersion to the above dispersion, the non-solvent is composed of 50% ethanol and 50% ultrapure water, the mass ratio of vinylidene fluoride-hexafluoropropylene:acetone:non-solvent is 2:7:4, stir until uniform, then ultrasonic for 1 h to obtain a stable white dispersion, which is the radiative cooling material base fluid.

[0052] (3) Take isopropyl alcohol 2 g, ultrapure water 5 g, silicon dioxide 0.3 g, stir until uniform, then ultrasonic for 1 h to form a uniform dispersion A liquid, take tetraethyl orthosilicate 3 g, 0.1 mol / L dilute hydrochloric acid 1 g, ethanol 1.5 g, stir until uniform, then ultrasonic for 1 h to obtain a stable dispersion B liquid, by adding different amounts of B liquid to A liquid to obtain super-amphiphobic spraying liquid with different super-amphiphobic properties and mechanical properties.

[0053] (4) The radiative cooling base fluid is obtained by using a doctor blade coating method, the doctor blade coating machine is set to a coating speed of 30 cm / min and a coating distance of 20 cm; the super-amphiphobic radiative cooling material is prepared by spraying the super-amphiphobic spraying liquid onto the radiative cooling base film, the spraying is as follows: the super-amphiphobic spraying liquid is placed under a pressure of 0.3-0.5 MPa, the radiative cooling base material is first placed on a hot stage at 65°C and heated for 5 minutes, then the spray pen is adjusted to a distance of 15 cm from the surface of the radiative cooling base material, the angle of the spray pen is 60° to the surface of the radiative cooling base material, and the solution is sprayed onto the surface of the base material.

[0054] (5) Surface fluorosilane modification by vapor deposition: the super-amphiphobic radiative cooling material after spraying is placed in a sealed environment with an open container, then a drop of 1H,1H,2H,2H-perfluorodecyltrichlorosilane is added to the container, vacuum is applied, and the super-amphiphobic radiative cooling material is left to stand at room temperature for 15 min in a vacuum sealed environment, finally washed and dried to obtain the super-amphiphobic radiative cooling material.

[0055] According to the above preparation process, 0 g, 1 g, 2 g, 3 g, 4 g, 5 g, and 6 g of the superomniphobic spraying liquid B was added for spraying, respectively; the superomniphobic performance liquid mechanical properties of the seven B liquid addition amounts were different, and the ethylene glycol contact angle, the rolling angle, and the maximum sand resistance mass corresponding to different B liquid addition amounts were as shown in Table 1:

[0056] Table 1

[0057] B liquid addition amount (g) Contact angle (°) Rolling angle (°) Sand mass (g) 0 177 1 12 1 168 1 45 2 170 1 55 3 169 1 58 4 167 2 54 5 161 2 36 6 162 4 20

[0058] As can be seen from the above table, with the increase of the B liquid addition amount, the performance of the superomniphobic material only slightly decreases, but the mechanical property greatly improves, and the optimal value is reached at 3 g, so the optimal addition amount of B liquid is 3 g.

[0059] Figure 2 A physical diagram of the superomniphobic radiative cooling material prepared when the B liquid addition amount is 3 g; Figure 3 A SEM diagram of the superomniphobic radiative cooling material prepared when the B liquid addition amount is 3 g, from which Figure 3 It can be known that the material has a multi-level porous micro-nano structure, and the multi-level pore structure makes the film material have a super-high solar reflectivity.

[0060] Figure 4 A SEM diagram of the superomniphobic spraying liquid sprayed on the glass substrate when the B liquid addition amount is 3 g, from which Figure 4 It can be known that the silicon oxide particles on the surface introduce a large degree of roughness of micron protrusions to the film surface, which not only enhances the overall scattering degree, but also makes the surface have the superomniphobic characteristics of high contact angle and low rolling angle to low surface tension solvents. Figure 5 A solar spectrum reflectivity and infrared emissivity diagram of the superomniphobic radiative cooling material prepared when the B liquid addition amount is 3 g, from which Figure 5 It can be known that the prepared superomniphobic radiative cooling material has a reflectivity of up to 99% in the solar wave band and an emissivity of 97% in the 8-13 μm atmospheric window.

[0061] Figure 6 A contact angle data diagram of the superomniphobic radiative cooling material prepared when the B liquid addition amount is 3 g, from which Figure 6 It can be known that the superomniphobic layer has very excellent liquid-repellent properties, and the contact angles of water and various oil droplets are all greater than 150°, and the rolling angles are all less than 5°.

[0062] Figure 7 A pore size distribution diagram of the superomniphobic radiative cooling material prepared when the B liquid addition amount is 3 g, from which Figure 7 It can be known that the pore size distribution of the superomniphobic radiative cooling film is 6±5 μm.

[0063] Figure 8 For outdoor temperature test group, by Figure 8 It can be seen that the material has excellent refrigeration performance. The temperature of the super-amphiphobic radiation refrigeration film group under direct sunlight is 5±3℃ lower than that of the commercial cloth covering group and 10±5℃ lower than that of the bare group.

[0064] Figure 9 For the influence of different B liquid addition on CA (contact angle) and SA (rolling angle), by Figure 9 It can be seen that with the increase of B liquid content, the CA (contact angle) and SA (rolling angle) start to change little, then the CA (contact angle) gradually decreases and the SA (rolling angle) gradually increases.

[0065] Figure 10 For the influence of different B liquid addition on mechanical properties, by Figure 10 It can be seen that when the B liquid addition is 3g, the mechanical strength is the best, and it can withstand 60g of sand impact without losing super-amphiphobic properties.

[0066] Example 2

[0067] This example explores the influence of the content of aluminum oxide nanoparticles on reflectivity.

[0068] The preparation process of the super-amphiphobic radiation refrigeration material includes the following steps:

[0069] (1) Take 2g of vinylidene fluoride-hexafluoropropylene and add it to 7g of acetone, stir uniformly, and then ultrasonic for 30min to form a uniform dispersion liquid.

[0070] (2) Add a series of mass concentrations of 300nm aluminum oxide dispersed non-solvent to the above dispersion liquid, the non-solvent is composed of 50% ethanol and 50% ultrapure water, the mass ratio of vinylidene fluoride-hexafluoropropylene:acetone:non-solvent is 2:7:4, stir uniformly, and then ultrasonic dispersion for 1h to obtain a stable white dispersion liquid, which is the radiation refrigeration material base liquid.

[0071] (3) Take isopropyl alcohol 2g, ultrapure water 5g, and silicon dioxide 0.3g, stir uniformly, and then ultrasonic for 1h to form a uniform dispersion liquid A, take tetraethyl silicate 3g, 0.1mol / L dilute hydrochloric acid 1g, and ethanol 1.5g, stir uniformly, and then ultrasonic for 1h to obtain a stable dispersion B, and prepare a super-amphiphobic spraying liquid by adding 3g of B liquid to A liquid.

[0072] (4) The radiation cooling material base liquid is obtained by using a scraping method to obtain a radiation cooling base material, and the scraping parameters of the scraping machine are set to 30 cm / min, and the scraping distance is 20 cm; the super-amphiphobicity radiation cooling material is prepared by spraying the super-amphiphobicity spraying liquid onto the radiation cooling base film by a spraying method, and the spraying is as follows: the super-amphiphobicity spraying liquid is placed under a pressure of 0.3-0.5 MPa, the radiation cooling base material is first placed on a hot stage at 65°C and heated for 5 minutes, then the spray pen is adjusted to a distance of 15 cm from the surface of the radiation cooling base material, the angle of the spray pen is 60° with the surface of the radiation cooling base material, and the solution is sprayed on the surface of the base material.

[0073] (5) Surface fluorosilane modification is performed by gas phase deposition: the super-amphiphobicity radiation cooling material after spraying is placed in a sealed environment together with an open container, then one drop of 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane is added into the container, vacuum is drawn, the super-amphiphobicity radiation cooling material is left to stand at room temperature for 15 min in the vacuum sealed environment, and finally washing and drying are performed to obtain the super-amphiphobicity radiation cooling material.

[0074] According to the above preparation process, 0%, 1%, 2%, 3%, 4%, 5%, and 6% of 300 nm aluminum oxide particles are added respectively to prepare the super-amphiphobicity radiation cooling material, and the preparation process is the same as that of Example 1, and the different percentage contents of 300 nm aluminum oxide particles will result in different reflectivity of the super-amphiphobicity radiation cooling material; the reflectivity corresponding to different percentage contents of 300 nm aluminum oxide is shown in Table 2.

[0075] Table 2

[0076] Alumina content (%) Reflectance (%) 0 96.3347 1 96.4708 2 97.5315 3 98.3992 4 98.7501 5 99.2795 6 99.2747

[0077] As can be seen from the above table, with the increase of the percentage content of aluminum oxide particles, the reflectivity performance is greatly improved, and the optimal value is reached at 5%, so the optimal value is obtained when the percentage content of aluminum oxide is 5%.

[0078] Example 3

[0079] This example explores the influence of the content of silicon dioxide on the contact angle.

[0080] (1) 2 g of vinylidene fluoride-hexafluoropropylene is added to 7 g of acetone, and after stirring uniformly, ultrasonic dispersion is performed for 30 min to form a uniform dispersion liquid.

[0081] (2) 5 wt% of 300 nm aluminum oxide dispersed non-solvent is added to the above dispersion liquid, the non-solvent is composed of 50% ethanol and 50% ultrapure water, the mass ratio of vinylidene fluoride-hexafluoropropylene: acetone: non-solvent is 2:7:4, after stirring uniformly, ultrasonic dispersion is performed for 1 h to obtain a stable white dispersion liquid, i.e., a radiation cooling material base liquid.

[0082] (3) 2 g of isopropyl alcohol, 4 g of ultrapure water, and different contents of silica were mixed evenly and ultrasonicated for 1 h to form a uniform dispersion liquid A. 3 g of tetraethyl silicate, 1 g of 0.1 mol / L dilute hydrochloric acid, and 1.5 g of ethanol were mixed evenly and ultrasonicated for 1 h to obtain a stably dispersed liquid B. 3 g of liquid B was added to liquid A to prepare a super-amphiphobic spray liquid.

[0083] (4) The base liquid of the radiation cooling material is used to obtain a radiation cooling substrate by a scraping method, the scraping parameters of the scraping machine are set to 30 cm / min, and the scraping distance is 20 cm; the super-amphiphobic spray liquid is sprayed onto the radiation cooling base film by a spraying method to obtain a super-amphiphobic radiation cooling material, and the spraying is as follows: the super-amphiphobic spray liquid is placed under a pressure of 0.3-0.5 MPa, the radiation cooling substrate is first placed on a hot plate at 65°C and heated for 5 minutes, and then the spray brush is adjusted to 15 cm away from the surface of the radiation cooling substrate, the spray brush angle is 60° with the surface of the radiation cooling substrate, and the solution is sprayed on the surface of the substrate.

[0084] (5) Surface fluorosilane modification by vapor deposition: First, the super-amphiphobic radiation cooling material after spraying is placed in a sealed environment together with an open container, and then a drop of 1H,1H,2H,2H-perfluorodecyltrichlorosilane is dripped into the container, and vacuum is applied. The super-amphiphobic radiation cooling material is allowed to stand at room temperature in a vacuum-sealed environment for 15 minutes, and finally washed and dried to obtain the super-amphiphobic radiation cooling material.

[0085] According to the above preparation process, 0.6wt%, 1.2wt%, 1.8wt%, 2.4wt%, and 3.0wt% of silica were added to the A solution respectively. The preparation process was the same as that of Example 1 above. The contact angle and sliding angle of different silica contents were measured. The results are as follows. Figure 11 As shown by Figure 11 It can be seen that with the increase of silica mass fraction, the CA (contact angle) and SA (sliding angle) performance data of oil droplets are significantly improved, with CA (contact angle) improving by more than 40° and SA (sliding angle) improving by more than 10°.

[0086] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations of these embodiments may be made without departing from the principles and spirit of the present invention, and the changes still fall within the scope of protection of the present invention.

Claims

1. A method for preparing a superamphiphobic radiative cooling material, characterized in that, The method comprises the following steps: (1) preparing a radiation refrigeration material base solution by dissolving polyvinylidene fluoride-hexafluoropropylene in acetone and adding an alumina dispersion solution; the mass fraction of alumina in the alumina dispersion solution is 4-6 wt%, the dispersion medium is ethanol and ultrapure water in a mass ratio of 1: (0.5-1.5), the mass ratio of polyvinylidene fluoride-hexafluoropropylene, acetone and the dispersion medium of the alumina dispersion solution is 2:7: (3-5), and the particle size of alumina particles in the alumina dispersion solution is 250-350 nm; (2) mixing isopropanol, water and silicon dioxide to prepare A liquid, mixing tetraethyl orthosilicate, hydrochloric acid and ethanol to prepare B liquid, and mixing the A liquid and the B liquid to prepare a super-amphiphobic spraying solution; the content of silicon dioxide in the A liquid is 1-10 wt%, the content of tetraethyl orthosilicate in the B liquid is 50-60 wt%, and the mass ratio of the A liquid to the B liquid is 1: (0.3-0.7); (3) obtaining a radiation refrigeration base material by using the radiation refrigeration material base solution to perform blade coating, spraying the super-amphiphobic spraying solution onto the radiation refrigeration base material by using a spraying method to obtain a super-amphiphobic radiation refrigeration material, and performing surface fluorosilane modification by using a gas phase deposition method, and finally washing and drying.

2. The method of claim 1, wherein the superamphiphobic radiative emittance material is prepared by the steps of: The particle size of the silicon dioxide is 25-35 nm.

3. The method of claim 1, wherein the superamphiphobic radiative emittance material is prepared by the steps of: In step (3), the spraying amount of the super-amphiphobic spraying solution on the radiation refrigeration base material per square centimeter is 0.1-0.2 g.

4. The method of claim 1, wherein the superamphiphobic radiative emittance material is prepared by the steps of: The fluorosilane material used in the surface fluorosilane modification comprises 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane.

5. The method of claim 4, wherein the superamphiphobic radiative emittance material is prepared by the steps of: The surface fluorosilane modification comprises: placing the super-amphiphobic radiation refrigeration material after spraying and an open container together in a sealed environment, then dropping 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane into the container, vacuumizing, and allowing the super-amphiphobic radiation refrigeration material to stand at room temperature for 10-20 min in the vacuum sealed environment.

6. A superamphiphobic radiative cooling material, characterized in that, The super-amphiphobic radiation refrigeration material is prepared by the method of any one of claims 1-5.

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