Super-hydrophobic photothermal conversion coating as well as preparation method and application thereof

Abstract

The invention discloses a super-hydrophobic photothermal conversion coating as well as a preparation method and application thereof, and belongs to the technical field of super-hydrophobic photothermal conversion coatings. According to the preparation method, the metal reflecting layer and the absorbing layer are sequentially deposited on the surface of the substrate through the magnetron sputtering method, a power source used for deposition is not turned off in the deposition process, one-step deposition is adopted, in addition, the deposition temperature is low, film coating can be conducted on the flexible substrate, the technical threshold and the machining cost are low, industrial production application is facilitated, and the method is suitable for large-scale popularization and application. The technical problem that an existing solar photo-thermal conversion coating processing technology is complex is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of super-hydrophobic photothermal conversion coatings, and in particular relates to a super-hydrophobic photothermal conversion coating and a preparation method and application thereof. Background Art

[0002] In recent years, wearable textiles have developed rapidly and are widely used in sports training, electronic skin, soft robots, prostheses, medical monitoring, and consumer wearable electronic products. Unfortunately, traditional fabric heating mostly relies on active heating, such as heating with an external power source, and the heating capacity of the electric heating method is related to the electric power density. It has the disadvantages of short life, low efficiency, poor reliability, and heavy personnel burden. It cannot actively and effectively control human body temperature, and is not conducive to long-term outdoor use in harsh environments. In addition, it requires a higher external voltage at the same heating temperature. The introduction of photothermal conversion coatings has brought hope for solving this problem. Photothermal conversion coatings can heat and keep human skin warm by absorbing sunlight energy alone without an external heat source. This method has the advantages of long life, high efficiency, low cost, and flexibility.

[0003] Most of the solar thermal conversion coatings reported so far can only be used on rigid substrates, which has created a technical bottleneck for the application of solar thermal conversion coatings in the field of flexible wearables. At present, the method of applying solar thermal conversion coatings to flexible substrates has the disadvantages of complex preparation process and high cost. Therefore, it is obviously necessary to develop and prepare a simple, low-cost, and flexible solar thermal conversion coating that can be applied to flexible substrates. Summary of the invention

[0004] The purpose of the present invention is to provide a super-hydrophobic photothermal conversion coating and a preparation method and application thereof, so as to solve the technical problems of complex processing technology and high cost of solar photothermal conversion coatings applied to flexible substrates in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a method for preparing a super-hydrophobic photothermal conversion coating, comprising the following steps: The substrate is pretreated, and then a metal reflection layer and an absorption layer are sequentially deposited on the surface by magnetron sputtering; When the metal reflective layer and the absorption layer are deposited, the power used for deposition is not turned off, and the deposition is completed in one step; The deposition target material used for the metal reflective layer is one of Ag target, Au target, Cu target, Ti target, Cr target and W target; the deposition target material used for the absorption layer is MoS2 target and metal palladium; the metal palladium is any two of Ag target, Au target, Cu target, Ti target, Cr target and W target. Furthermore, the pretreatment of the substrate comprises the following steps: Firstly, the substrate is placed in an ethanol solution for ultrasonic cleaning, and then the substrate is placed in a vacuum chamber of a magnetron sputtering system, argon gas is introduced, and bias is turned on for bias cleaning. Furthermore, the ultrasonic cleaning time is 20 to 30 minutes; the pressure in the vacuum chamber is 10 -4 Pa.

[0006] Furthermore, the step of depositing the metal reflective layer on the substrate surface by magnetron sputtering is as follows: Place the substrate on the sample stage of the vacuum chamber of the magnetron sputtering system, adjust the working gas pressure of the vacuum chamber of the magnetron sputtering system to 0.6-0.9 Pa, introduce argon gas with a flow rate of 90-110 sccm, turn on the DC power supply of the Ag target, adjust the current and voltage of the DC power supply to make its power 2.5-4 W, turn on the speed control button of the sample stage, adjust the speed to 10-14 r / min, finally, open the baffle, record the deposition time, and complete the preparation of the metal reflective layer.

[0007] Furthermore, when depositing the metal reflective layer, the deposition time is 10-20 min.

[0008] Furthermore, the step of depositing the absorption layer by magnetron sputtering is as follows: After depositing the metal reflective layer, the power supply used for depositing the metal reflective layer is not turned off, only the baffle is closed; the working gas pressure is directly adjusted to 0.6-0.9 Pa, argon gas is introduced at a flow rate of 90-110 sccm, the RF power supply of the MoS2 target is adjusted to 190-220 W, the current and voltage of the DC power supply of the Ag target is adjusted to 18-22 W, and the current and voltage of the DC power supply of the Cu target is adjusted to 12-14.6 W. After the adjustment is completed, the baffle is opened, the deposition time is recorded, and the preparation of the absorption layer is completed.

[0009] Furthermore, when depositing the absorption layer, the deposition time is 85-98 min.

[0010] Further, the substrate is a polymer sheet; The substrate is polyimide, polyethylene terephthalate or non-woven fabric.

[0011] The present invention also discloses a super-hydrophobic photothermal conversion coating prepared by the above-mentioned preparation method.

[0012] The present invention also discloses the application of the super-hydrophobic photothermal conversion coating in a flexible substrate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a method for preparing a super-hydrophobic photothermal conversion coating. A metal reflective layer and an absorption layer are sequentially deposited on the surface of a substrate by a magnetron sputtering method. During the deposition process, the power supply used for deposition is not turned off, and the deposition is completed in one step. In addition, the deposition temperature is low, and a film can be plated on a flexible substrate. The technical threshold and processing cost are low, which is conducive to industrial production and application, and solves the technical problem of complex processing technology of existing solar photothermal conversion coatings.

[0014] Furthermore, the method of the present invention is prepared by magnetron sputtering coating technology, which solves the problem that most of the current mainstream super-hydrophobic photothermal conversion coatings on the market are prepared by chemical deposition, which will produce a lot of waste gas and wastewater, and cause great environmental pollution. In addition, the doped metal nanoparticles Ag and Cu are relatively cheap; the metal reflective layer produced by magnetron sputtering can reflect human infrared thermal radiation, reduce human heat loss, and have good optical properties; at the same time, the bonding force between the coating and the substrate is improved, and the internal stress of the coating is reduced; in addition, due to the preparation of the metal reflective layer, the performance stability between the coating and the substrate is improved, and the possibility of chemical reaction is reduced; the coating thickness can be controlled at the nanoscale by regulating the power and deposition time, and the environmental pollution is very small and no toxic substances are produced.

[0015] The present invention also discloses a super-hydrophobic photothermal conversion coating prepared on a flexible substrate by the above method, which has the advantages of high heating temperature, hydrophobicity, anti-icing / deicing, etc. The super-hydrophobic photothermal conversion coating uses solar energy as a heat source, does not consume additional energy, and can efficiently heat human skin under sunlight; according to relevant experimental results, the super-hydrophobic photothermal conversion coating prepared by the present invention has a contact angle of up to 152.9° on the surface of the super-hydrophobic photothermal conversion coating (contact angle>150° is super-hydrophobic), and the coating exhibits excellent super-hydrophobicity. Regardless of the intensity of solar radiation, the sample can reach the highest temperature in about 500 s, and the highest temperature is stable at 90.2 ℃ under the intensity of 1 sun radiation.

[0016] The present invention also discloses the application of the super-hydrophobic photothermal conversion coating in a flexible substrate. The super-hydrophobic photothermal conversion coating prepared by the invention in a flexible substrate can autonomously and efficiently absorb solar radiation energy and convert it into heat energy to heat human skin. In addition, it can also reflect human infrared thermal radiation and reduce human heat loss, thus forming a dual-functional mode effect. The flexible substrate using the super-hydrophobic photothermal conversion coating also has a large water contact angle, showing excellent hydrophobic and anti-icing / de-icing properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a SEM image of a super-hydrophobic photothermal conversion coating on a non-woven fabric substrate; Figure 2Schematic diagram of the contact angle of the super-hydrophobic photothermal conversion coating on the non-woven fabric substrate of the present invention; Figure 3 The deicing time of the superhydrophobic photothermal conversion coating on the non-woven substrate under different temperature and light conditions; Figure 4 The actual temperature change of the sample surface of the super-hydrophobic photothermal conversion coating on the non-woven fabric substrate of the present invention after 5 cycles under simulated 0.5, 1, and 1.5 solar radiation intensities; Figure 5 This is the temperature change curve of the super-hydrophobic photothermal conversion coating on the non-woven fabric substrate after being torn, worn, rubbed and stretched 100 times under 1 sun radiation intensity. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0019] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0020] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0021] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0022] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0023] The present invention provides a method for preparing a super-hydrophobic photothermal conversion coating, comprising the following steps: Step 1: Place the substrate in an ethanol solution to treat the surface of the substrate, and then ultrasonically clean it for 20 min; Step 2: Place the treated substrate into the vacuum chamber of the magnetron sputtering system and evacuate to 10 -4 Pa pressure, and argon gas was introduced, and bias cleaning was performed by turning on the bias to ensure better adhesion between the substrate and the coating; Step 3: First, Ag was plated as a metal reflective layer. The working gas pressure was adjusted to 0.8 Pa, the Ar gas flow rate was 100 sccm, the DC power supply of the Ag target was turned on, the current and voltage were adjusted to make the power 3 W, the speed control button of the sample stage was turned on, and the speed was adjusted to 12 r / min. Finally, the baffle was opened and the deposition time was recorded as 10 min to complete the preparation of the metal reflective layer. Step 4: There is no need to turn off the power supply for the preparation of the absorption layer. Just close the baffle and directly adjust the working pressure to 0.8 Pa. The Ar gas flow rate is 107 sccm, the MoS2 target RF power supply is adjusted to 200 W, the Ag target DC power supply A and the current and voltage are adjusted to make its power 20 W, and the Cu target DC power supply B and the current and voltage are adjusted to make its power 13 W. After the adjustment is completed, open the baffle and record the deposition time as 90 min. The preparation of the absorption layer is completed.

[0024] The present invention also discloses a super-hydrophobic photothermal conversion coating prepared by the above-mentioned preparation method.

[0025] The present invention also discloses the application of the above-mentioned super-hydrophobic photothermal conversion coating in flexible substrates (non-woven fabrics, polymer sheets (such as polyimide, polyethylene terephthalate)). At present, the research on flexible solar heating textiles is still in the initial stage, and there are no similar products at home and abroad. Traditional textile heating relies on external power supply for heating, which has the disadvantages of short life, low efficiency, low reliability, and heavy load. The super-hydrophobic photothermal conversion coating prepared by the invention in textiles can absorb solar radiation energy autonomously and efficiently, and convert it into heat energy to heat human skin, and can reflect human infrared thermal radiation to reduce human heat loss, forming a dual-functional mode effect. In addition, the super-hydrophobic photothermal conversion textiles also have a large water contact angle, showing excellent hydrophobic properties.

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0027] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0028] Example 1 A method for preparing a super-hydrophobic photothermal conversion coating comprises the following steps: S1: First, the substrate was placed in an ethanol solution for ultrasonic cleaning for 25 min, and then the substrate was placed in a vacuum chamber of a magnetron sputtering system with a pressure of 10 -4 Pa, and argon gas is introduced, and bias is turned on for bias cleaning; wherein the substrate is a non-woven fabric; S2: Place the substrate treated in S1 on the sample stage of the vacuum chamber of the magnetron sputtering system, adjust the working gas pressure of the vacuum chamber of the magnetron sputtering system to 0.8 Pa, introduce argon gas with a flow rate of 100 sccm, turn on the DC power supply of the Ag target, adjust the current and voltage of the DC power supply to make its power 3 W, turn on the speed control button of the sample stage, adjust the speed to 12 r / min, finally, open the baffle, record the deposition time as 15 min, and complete the preparation of the metal reflective layer; S3: After depositing the metal reflective layer, the power used for depositing the metal reflective layer is not turned off, only the baffle is closed; the working gas pressure is directly adjusted to 0.8 Pa, and argon gas with a flow rate of 107 sccm is introduced. The current and voltage of the RF power supply of the MoS2 target are adjusted to make its power 200 W, the current and voltage of the DC power supply of the Ag target are adjusted to make its power 20 W, and the current and voltage of the DC power supply of the Cu target are adjusted to make its power 13 W. After the adjustment is completed, the baffle is opened and the deposition time is recorded as 90 min. The absorption layer is prepared to obtain a super-hydrophobic photothermal conversion coating.

[0029] Example 2 A method for preparing a super-hydrophobic photothermal conversion coating comprises the following steps: S1: First, the substrate was placed in an ethanol solution for ultrasonic cleaning for 20 min, and then the substrate was placed in a vacuum chamber of a magnetron sputtering system with a pressure of 10 -4 Pa, and argon gas is introduced, and bias is turned on for bias cleaning; wherein the substrate is a non-woven fabric; S2: Place the substrate treated in S1 on the sample stage of the vacuum chamber of the magnetron sputtering system, adjust the working gas pressure of the vacuum chamber of the magnetron sputtering system to 0.6 Pa, introduce argon gas with a flow rate of 90 sccm, turn on the DC power supply of the Ag target, adjust the current and voltage of the DC power supply to make its power 2.5 W, turn on the speed control button of the sample stage, adjust the speed to 10 r / min, finally, open the baffle, record the deposition time as 10 min, and complete the preparation of the metal reflective layer; S3: After depositing the metal reflective layer, the power used for depositing the metal reflective layer is not turned off, only the baffle is closed; the working gas pressure is directly adjusted to 0.6 Pa, argon gas with a flow rate of 90 sccm is introduced, the current and voltage of the RF power supply of the MoS2 target is adjusted to make its power 190 W, the current and voltage of the DC power supply of the Ag target is adjusted to make its power 18 W, and the current and voltage of the DC power supply of the Cu target is adjusted to make its power 12 W. After the adjustment is completed, the baffle is opened and the deposition time is recorded as 85 min. The absorption layer is prepared to obtain a super-hydrophobic photothermal conversion coating.

[0030] Example 3 A method for preparing a super-hydrophobic photothermal conversion coating comprises the following steps: S1: First, the substrate was placed in an ethanol solution for ultrasonic cleaning for 30 min, and then the substrate was placed in a vacuum chamber of a magnetron sputtering system with a pressure of 10 -4 Pa, and argon gas is introduced, and bias is turned on for bias cleaning; wherein the substrate is a non-woven fabric; S2: Place the substrate treated in S1 on the sample stage of the vacuum chamber of the magnetron sputtering system, adjust the working gas pressure of the vacuum chamber of the magnetron sputtering system to 0.9 Pa, introduce argon gas with a flow rate of 110 sccm, turn on the DC power supply of the Ag target, adjust the current and voltage of the DC power supply to make its power 4 W, turn on the speed control button of the sample stage, adjust the speed to 14 r / min, finally, open the baffle, record the deposition time as 20 min, and complete the preparation of the metal reflective layer; S3: After depositing the metal reflective layer, the power used for depositing the metal reflective layer is not turned off, only the baffle is closed; the working gas pressure is directly adjusted to 0.9 Pa, and argon gas with a flow rate of 110 sccm is introduced. The current and voltage of the RF power supply of the MoS2 target are adjusted to make its power 220 W, the current and voltage of the DC power supply of the Ag target are adjusted to make its power 22 W, and the current and voltage of the DC power supply of the Cu target are adjusted to make its power 14.6 W. After the adjustment is completed, the baffle is opened and the deposition time is recorded as 98 min. The absorption layer is prepared to obtain a super-hydrophobic photothermal conversion coating.

[0031] Example 4 A method for preparing a super-hydrophobic photothermal conversion coating comprises the following steps: S1: First, the substrate was placed in an ethanol solution for ultrasonic cleaning for 22 min, and then the substrate was placed in a vacuum chamber of a magnetron sputtering system with a pressure of 10 -4 Pa, and argon gas is introduced, and bias is turned on for bias cleaning; wherein the substrate is a non-woven fabric; S2: Place the substrate treated in S1 on the sample stage of the vacuum chamber of the magnetron sputtering system, adjust the working gas pressure of the vacuum chamber of the magnetron sputtering system to 0.7 Pa, introduce argon gas with a flow rate of 98 sccm, turn on the DC power supply of the Ag target, adjust the current and voltage of the DC power supply to make its power 3.5 W, turn on the speed control button of the sample stage, adjust the speed to 13 r / min, finally, open the baffle, record the deposition time as 13 min, and complete the preparation of the metal reflective layer; S3: After depositing the metal reflective layer, the power used for depositing the metal reflective layer is not turned off, only the baffle is closed; the working gas pressure is directly adjusted to 0.7 Pa, and argon gas with a flow rate of 100 sccm is introduced. The current and voltage of the RF power supply of the MoS2 target are adjusted to make its power 213 W, the current and voltage of the DC power supply of the Ag target are adjusted to make its power 19 W, and the current and voltage of the DC power supply of the Cu target are adjusted to make its power 14 W. After the adjustment is completed, the baffle is opened and the deposition time is recorded as 95 min. The absorption layer is prepared to obtain a super-hydrophobic photothermal conversion coating.

[0032] Figure 1 This is the SEM image of the superhydrophobic photothermal conversion coating on the non-woven fabric substrate. It can be seen that the photothermal conversion coating obtained by magnetron sputtering is evenly deposited on the surface of the non-woven fabric fibers. The tops of the surface particles are pointed, and there are granular agglomerations and the distribution is compact and uniform, indicating that the photothermal conversion coating is successfully deposited on the non-woven fabric substrate.

[0033] The hydrophobicity performance of the super-hydrophobic photothermal conversion coating prepared in Example 1 was tested. A 5 uL water droplet was fixed on the surface of the super-hydrophobic photothermal conversion coating, and the contact angle of the coating was tested by a contact angle measuring instrument. Figure 2 As shown, the contact angle of water droplets on the coating surface is as high as 152.9° (contact angle > 150° is superhydrophobic), and the coating exhibits excellent superhydrophobicity.

[0034] Then the photothermal deicing and delayed icing performance tests were carried out. A full-spectrum xenon lamp was placed above the cold stage device, and the super-hydrophobic photothermal conversion coating was tested for deicing at -10 ℃, -15 ℃ and -20 ℃ respectively, using 1, 1.5 and 2 sun irradiation intensities. The timing was stopped when all the ice turned into water. The deicing time of the super-hydrophobic photothermal conversion coating at -20 ℃ and 1 sun irradiation intensity was only 43 s, which was less than 1 min. Figure 3As shown, it shows that the super-hydrophobic photothermal conversion coating has excellent photothermal deicing performance; the non-woven fabric sample with the super-hydrophobic photothermal conversion coating and the single non-woven fabric sample were placed on a cold stage device and 10 µL water droplets were fixed respectively. The cold stage was used to maintain the ambient temperature at -20 ℃, and the freezing state was observed by a contact angle meter; the freezing time of the water droplets on the coated non-woven fabric sample was 31 s, and the freezing time on the uncoated non-woven fabric sample was 12 s, which effectively slowed down the freezing time, indicating that the super-hydrophobic photothermal conversion coating has good delayed icing performance.

[0035] The surface of the super-hydrophobic photothermal conversion coating was irradiated with full-spectrum xenon lamps of different powers to simulate sunlight of different irradiation intensities, and the surface temperature change was measured to evaluate the photothermal conversion performance of the coating. The super-hydrophobic photothermal conversion coatings with powers of Ag20 W and Cu13.3 W had the best photothermal absorption performance. Figure 4 As shown in the figure, the maximum temperature can be stabilized at 56.7 ℃ when irradiated with 0.5 solar radiation intensity, the maximum temperature can be stabilized at 88.5 ℃ when irradiated with 1 solar radiation intensity, and the maximum temperature can be stabilized at 128.3 ℃ when irradiated with 1.5 solar radiation intensity; regardless of the intensity of sunlight, the non-woven fabric sample can reach the maximum temperature in about 500 s, indicating that the superhydrophobic photothermal conversion coating has excellent photothermal conversion performance.

[0036] The photothermal stability of the superhydrophobic photothermal conversion coating was characterized by simulating the daily working environment of textiles and the loss during laboratory use; Figure 5 As shown, after the cotton cloth is mechanically treated by surface abrasion, rubbing, and stretching, it can still maintain a surface temperature above 85°C under irradiation with an intensity of 1 sun; therefore, the prepared superhydrophobic photothermal conversion coating has good photothermal stability.

[0037] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a super-hydrophobic photothermal conversion coating, characterized in that: The following steps are involved: The substrate is pretreated, and then a metal reflection layer and an absorption layer are sequentially deposited on the surface by magnetron sputtering; When the metal reflective layer and the absorption layer are deposited, the power used for deposition is not turned off, and the deposition is completed in one step; The deposition target material used for the metal reflective layer is one of Ag target, Au target, Cu target, Ti target, Cr target and W target; the deposition target material used for the absorption layer is MoS2 target and metal palladium; the metal palladium is any two of Ag target, Au target, Cu target, Ti target, Cr target and W target.

2. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 1, characterized in that: The pretreatment of the substrate comprises the following steps: Firstly, the substrate is placed in an ethanol solution for ultrasonic cleaning, and then the substrate is placed in a vacuum chamber of a magnetron sputtering system, argon gas is introduced, and bias is turned on for bias cleaning.

3. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 2, characterized in that: The ultrasonic cleaning time is 20 to 30 minutes; the pressure in the vacuum chamber is 10 -4 Pa.

4. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 1, characterized in that: The step of depositing the metal reflective layer on the substrate surface by magnetron sputtering is as follows: Place the substrate on the sample stage of the vacuum chamber of the magnetron sputtering system, adjust the working gas pressure of the vacuum chamber of the magnetron sputtering system to 0.6-0.9 Pa, introduce argon gas with a flow rate of 90-110 sccm, turn on the DC power supply of the Ag target, adjust the current and voltage of the DC power supply to make its power 2.5-4 W, turn on the speed control button of the sample stage, adjust the speed to 10-14 r / min, finally, open the baffle, record the deposition time, and complete the preparation of the metal reflective layer.

5. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 4, characterized in that: When depositing the metal reflective layer, the deposition time is 10-20 min.

6. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 4, characterized in that: The steps of depositing the absorption layer by magnetron sputtering are as follows: After depositing the metal reflective layer, the power supply used for depositing the metal reflective layer is not turned off, only the baffle is closed; the working gas pressure is directly adjusted to 0.6-0.9 Pa, argon gas is introduced at a flow rate of 90-110 sccm, the RF power supply of the MoS2 target is adjusted to 190-220 W, the current and voltage of the DC power supply of the Ag target is adjusted to 18-22 W, and the current and voltage of the DC power supply of the Cu target is adjusted to 12-14.6 W. After the adjustment is completed, the baffle is opened, the deposition time is recorded, and the preparation of the absorption layer is completed.

7. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 6, characterized in that: When depositing the absorption layer, the deposition time is 85-98 min.

8. The method for preparing a super-hydrophobic photothermal conversion coating according to claim 1, characterized in that: The substrate is a polymer sheet; The substrate is polyimide, polyethylene terephthalate or non-woven fabric.

9. A super-hydrophobic photothermal conversion coating, characterized in that: The method is prepared by any one of claims 1 to 8.

10. Use of the super-hydrophobic photothermal conversion coating according to claim 9 in a flexible substrate.

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