Nanometer photothermal hydrophobic material, preparation method and application thereof

Abstract

The application provides a kind of nano photothermal hydrophobic material and preparation method and application, it is related to coating filler technical field.A kind of nano photothermal hydrophobic material, with polypyrrole nano photothermal material as core, surface is wrapped with fluorine-containing silane modified silica layer;Wherein polypyrrole nano photothermal material is with polypyrrole modified photothermal nano material;Its preparation method, polypyrrole nano photothermal material is dispersed in solvent, silane compound is added, silane compound is hydrolyzed, and polypyrrole nano photothermal material surface is wrapped with silica shell;Fluorine-containing silane is added, and fluorine-containing silane is grafted to silicon shell, to obtain nano photothermal hydrophobic material.The prepared nano photothermal hydrophobic material has photothermal conversion, superhydrophobic performance, and the preparation cost is lower, can be used for coating filler, under low temperature and high humidity environmental conditions, the deicing effect is remarkable, and the icing time is prolonged.

Description

Technical Field

[0001] This invention relates to the field of materials, specifically to the field of nano-photothermal hydrophobic materials. Background Technology

[0002] Ice is a common natural phenomenon in cold climates, causing numerous inconveniences to daily life and production. Currently, traditional anti-icing / de-icing methods are used, including electric, air-heat, mechanical, manual, and liquid-mixing methods. However, these de-icing methods suffer from low efficiency, high energy consumption, and environmental unfriendliness. Furthermore, most current methods for preparing superhydrophobic coatings are expensive and require stringent preparation conditions, resulting in coatings with generally poor mechanical strength and durability, limiting their application in many fields.

[0003] Passive anti-icing technology has gained increasing attention as an effective anti-icing strategy. It is widely believed that utilizing anti-icing / de-icing materials is one of the most cost-effective methods for preventing icing. Passive anti-icing surfaces are designed to reduce surface ice accumulation, requiring little or no external intervention and relying entirely on the material's internal superhydrophobic or anti-icing properties. However, with further research, the anti-icing performance of superhydrophobic coatings is influenced and limited by many factors. Even in high humidity and low temperature environments, superhydrophobic surfaces still struggle to avoid icing and frost formation, and de-icing of superhydrophobic surfaces still requires a considerable amount of time.

[0004] Existing technology CN116376414A discloses a photothermal superhydrophobic anti-icing coating. The photothermal coating is located on the surface of a substrate. A superhydrophobic coating is applied to the surface of the photothermal coating using spraying and brushing processes, resulting in a uniform coverage of hydrophobic nanoparticles on the surface of the photothermal coating, thus achieving the anti-icing function. This method uses physical bonding to attach the superhydrophobic coating to the photothermal coating, requiring two coating processes. This increases the workload, and the physical bonding between the coatings is prone to peeling, making the prepared superhydrophobic coating susceptible to failure and thus affecting the overall anti-icing performance of the coating. Summary of the Invention

[0005] The purpose of this invention is to provide a nano-photothermal hydrophobic material to solve the above-mentioned technical problems.

[0006] The present invention provides the following technical solution, specifically:

[0007] A nano-photothermal hydrophobic material, which has a polypyrrole nano-photothermal material as the core and a fluorinated silane-modified silica layer on the surface; wherein the polypyrrole nano-photothermal material is a polypyrrole-modified photothermal nanomaterial.

[0008] The photothermal nanomaterial is selected from one or more of nano-carbon powder (C), nano-hexagonal boron nitride (BN), nano-boron carbide (B4C), nano-molybdenum disulfide (MoS2), and nano-molybdenum carbide (Mo2C).

[0009] Nanomaterials with an average size of 50 nm are generally preferred for photothermal nanomaterials.

[0010] The fluorinated silane is selected from one or more of 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS), heptadecafluorodecyltrimethoxysilane (FAS-17), heptadecafluorodecyltripropoxysilane, and trifluoroo-propyltrimethoxysilane.

[0011] This nano-photothermal hydrophobic material possesses photothermal conversion and superhydrophobic properties, and has a low preparation cost. It can be used as a filler for coatings. When added to the coating according to the specified ratio, it can give the coating a superhydrophobic surface with passive anti-icing and active de-icing properties. Under low temperature and high humidity conditions, the de-icing effect is significant, the photothermal conversion efficiency is high, and the freezing time is extended.

[0012] The particle size of the nano-photothermal hydrophobic material was measured by scanning electron microscopy and transmission electron microscopy. The particle size of the nano-photothermal hydrophobic material was 100-300 nm. The average particle size of the polypyrrole nano-photothermal material, which is the core of the nano-photothermal hydrophobic material, was 50-250 nm.

[0013] The preparation method of the above-mentioned nano-photothermal hydrophobic materials is as follows:

[0014] (1) The polypyrrole nanophotothermal material is dispersed in a solvent, and a silane compound is added. The silane compound is hydrolyzed to coat the surface of the polypyrrole nanophotothermal material with a silicon shell.

[0015] (2) Add fluorinated silane and graft the fluorinated silane onto the silicon shell to obtain nano-photothermal hydrophobic material.

[0016] Further, in step (1), the ratio of the amount of polypyrrole nanophotothermal material to silane compound is 1g:0.01-0.10mol; the ratio of the amount of polypyrrole nanophotothermal material to fluorinated silane is 1g:0.001mol-0.15mol.

[0017] The reaction time for step (1) is 0.5-2 hours; the reaction time for step (2) is 8-16 hours.

[0018] The solvent mentioned in step (1) above is an aqueous solution of ethanol containing ammonia;

[0019] The solvent contains 60%-80% ethanol by volume and 20-50 g / L of ammonia.

[0020] The ratio of polypyrrole nanophotothermal material to solvent is 1g: 20-200ml.

[0021] Silane compounds require water for hydrolysis, but they react violently in pure water, rapidly forming a silica shell that lacks hydrophobic properties. Ethanol can slow down the hydrolysis process, allowing the reaction to proceed more slowly. This enables the subsequent addition of fluorinated silanes to participate in the reaction and graft them onto the silica shell on the surface of photothermal materials.

[0022] Furthermore, the silane compound is one or more of tetraethyl orthosilicate (TEOS), trimethylsilane, and triethylsilane.

[0023] Furthermore, the polypyrrole nanophotothermal material is prepared by in-situ polymerization of pyrrole and nanomaterials, which can be either ice bath polymerization or room temperature polymerization.

[0024] This invention provides an application of a nano-photothermal hydrophobic material for use as a coating filler.

[0025] There are two main types of hydrophobic modification techniques for coatings. One method involves modifying the coating to possess hydrophobic properties before practical application. However, coatings prepared using this method still require morphological modification or the addition of fillers to achieve a rough surface and thus a superhydrophobic surface. The other method, as described in this paper, modifies the filler added to the coating to impart hydrophobic and other properties. This allows the filler to directly achieve superhydrophobicity and other properties upon being added to the coating according to the specified ratio, without further processing. The nano-photothermal hydrophobic material of this invention provides a simple and rapid modification method for coatings, enabling them to acquire superhydrophobic photothermal properties and enhanced anti-icing and de-icing capabilities.

[0026] Advantages of this invention:

[0027] (1) Nanophotothermal materials have strong light absorption capacity in the near-infrared region through the conjugated structure of polypyrrole (PPy). Combined with some materials such as nano carbon powder (C) and molybdenum disulfide (MoS2) which have strong light absorption capacity, the above-mentioned nanophotothermal materials have strong absorption capacity for ultraviolet, visible and near-infrared light and high photothermal conversion efficiency.

[0028] (2) Furthermore, by functionalizing a series of nanomaterials with conductive polymers such as PPy, which possess excellent properties such as high strength, acid and alkali resistance, and heat insulation, the nanophotothermal material has good mechanical properties, acid and alkali resistance, and corrosion resistance.

[0029] (3) The nano-photothermal hydrophobic material is coated with a silica shell by hydrolysis of silane compounds such as TEOS, thereby increasing the roughness of the particle surface. At the same time, the hydrolysis of silane compounds allows the added fluorinated silanes such as FAS to be grafted onto the silica shell surface, reducing the surface energy of the nano-photothermal material. This gives the particle surface of the above-mentioned nano-photothermal hydrophobic material a micro-nano rough structure with hydrophobic properties. At the same time, the micro-nano structure is more likely to capture light beams, thereby increasing the transmission path of light beams in the material, increasing the light absorption rate, and enhancing the photothermal conversion efficiency.

[0030] (4) The coating containing nano-photothermal hydrophobic materials has superhydrophobic properties and its self-cleaning performance is significant, indicating that the coating has self-cleaning properties after modification. Attached Figure Description

[0031] Figure 1 XPS image of BN nanomaterial from Example 1;

[0032] Figure 2 XPS image of BN@PPy nanophotothermal material in Example 1;

[0033] Figure 3 XPS spectra of the nano-photothermal hydrophobic material F-BN@PPy in Example 1, C1s XPS spectrum of F-BN@PPy (top right), and Si 2p XPS spectrum (bottom right);

[0034] Figure 4 Here is a SEM image of the nanophotothermal material BN@PPy from Example 1;

[0035] Figure 5 Here is a SEM image of the nano-photothermal hydrophobic material F-BN@PPy from Example 1;

[0036] Figure 6 Transmission electron microscopy image of the nano-photothermal hydrophobic material F-BN@PPy;

[0037] Figure 7 The diagram illustrates the changes in the wettability of the nano-photothermal material and the nano-hydrophobic material in Example 1 to water.

[0038] Figure 8 Here is a SEM image of the nanophotothermal material from Example 2;

[0039] Figure 9 The graphs show the temperature change curves of the nanophotothermal materials in Examples 1 and 2 under simulated 1sun light.

[0040] Figure 10 This is a SEM image of the photothermal superhydrophobic coating surface in Example 3;

[0041] Figure 11The image shows the WCA pattern of the photothermal superhydrophobic coating surface in Example 3.

[0042] Figure 12 The image shows a comparison of the self-cleaning performance of the photothermal superhydrophobic coating in Example 3.

[0043] Figure 13 The temperature change of the photothermal superhydrophobic coating of Example 3 under 1 sun illumination on a -40°C cooling platform is shown in the graph.

[0044] Figure 14 The images show the photothermal de-icing records of the photothermal superhydrophobic coating in Example 3 and the original coating.

[0045] Figure 15 The image shows the anti-icing performance of the tinplate, the original coating, and the photothermal superhydrophobic coating in Example 3. Detailed Implementation

[0046] The nanomaterials mentioned in the article include nano-carbon powder (C), nano-hexagonal boron nitride (BN), nano-boron carbide (B4C), nano-molybdenum disulfide (MoS2), and nano-molybdenum carbide (Mo2C). For unified purchase, nanomaterials with an average size of 50nm are generally preferred.

[0047] Example 1

[0048] The nano-photothermal hydrophobic material prepared in this embodiment is fluorine-modified polypyrrole-functionalized boron nitride (F-BN@PPy).

[0049] The specific preparation method is as follows:

[0050] A. Polypyrrole nanophotothermal materials are prepared by in-situ polymerization of pyrrole and nanomaterials. Polypyrrole functionalized boron nitride can be prepared by the following methods: a) ice bath polymerization or b) room temperature polymerization.

[0051] Method a: Pyrrole monomer (3 mL) and surfactant sodium dodecylbenzenesulfonate (5 wt%, SDBS is 5% by mass in pyrrole monomer) were dissolved in water-ethanol solvent (200 mL, v / v = 1:1), stirred vigorously and sonicated.

[0052] Add 1g of nanomaterial BN to the above mixture and further sonicate for 1 hour.

[0053] After adding 0.33 g of the oxidant ammonium persulfate ((NH4)2S2O8), the reaction mixture was stirred in an ice bath for 8 hours to carry out in-situ polymerization.

[0054] The obtained solid was collected by vacuum filtration and repeatedly washed with deionized water and ethanol to remove monomers, surfactants (SDBS) and oxidants (ammonium persulfate). Then, it was vacuum dried at 60°C to obtain nanophotothermal material, polypyrrole-functionalized boron nitride.

[0055] Method b: Ferric chloride hexahydrate (0.3M) (FeCl3·6H2O) was obtained by adding 9.72g FeCl3 and 10ml concentrated hydrochloric acid (37wt%) to 200ml deionized water and stirring for 20min. Nanomaterial BN (10g) was then added, followed by ultrasonic treatment for 1 hour.

[0056] Sodium dodecylbenzenesulfonate (SDBS) (5 wt%, SDBS is 5% by mass in pyrrole monomer) was added to 200 ml of pyrrole (0.3 M) solution and mixed evenly. Then, 200 ml of ferric chloride hexahydrate (0.3 M) oxidant was added and stirred for 1 h. After washing by repeated centrifugation (5000 r), the mixture was dried under vacuum at 60 °C to obtain polypyrrole-functionalized boron nitride.

[0057] In the two functionalization methods described above, method a uses sodium persulfate as the oxidant, while method b uses ferric chloride hexahydrate. In method a, ice-bath polymerization reduces the reaction rate, controlling the polymerization process and ensuring a more complete formation of the polypyrrole-coated nanomaterials, resulting in less waste in subsequent washing steps. Method b, with room-temperature polymerization, has a shorter polymerization time but slightly lower polymerization efficiency than method a. The thickness of the polypyrrole-coated nanomaterials may be uneven, and the washing step may wash away some uncoated polypyrrole, resulting in a very small amount of waste. The nanomaterials prepared by these two functionalization methods yield no significant difference in their photothermal and hydrophobic properties, and the method chosen can be based on specific needs and conditions.

[0058] B. Hydrophobic modification method for nanomaterials for photothermal applications:

[0059] Polypyrrole nanophotothermal material polypyrrole functionalized boron nitride (BN@PPy) (0.3g) was added to a mixed solution consisting of anhydrous ethanol (20mL), 4mL ammonia (25%) and distilled water (4mL), and the mixture was stirred uniformly with magnetic stirring at room temperature for 1 hour to obtain a suspension.

[0060] Then, tetraethyl orthosilicate (TEOS) (2 mL, 0.0089 mol TEOS) was slowly added dropwise to the above suspension and stirred evenly for 1 hour to obtain a black mixture solution. The main purpose of this part is to coat the particle surface with a silicon shell, thereby improving the surface roughness of the particles.

[0061] Finally, 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS) (1 mL, 0.00157 mol FAS) was added dropwise to the above homogeneous black mixture solution as a hydrophobic agent, and then magnetically stirred for 12 hours in a water bath at 40 °C to graft it onto the silicon shell of the nanophotothermal material. The main purpose of this step is to reduce the surface energy of the particles.

[0062] The solid obtained from the solution was collected by vacuum filtration, and washed repeatedly with deionized water and ethanol to remove impurities. Then it was dried under vacuum at 60°C to obtain a nano-photothermal hydrophobic material, fluorine-modified polypyrrole-functionalized boron nitride, denoted as F-BN@PPy.

[0063] Testing and Characterization:

[0064] The nanomaterials used in this embodiment were characterized using X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results are as follows: Figures 1-6 As shown.

[0065] Figure 1 and 2 High-resolution XPS spectra of BN and BN@PPy were shown. Compared with BN, it has significantly more C and less B, which also proves the successful functionalization of polypyrrole by PPy.

[0066] Figure 3 The XPS spectra of F-BN@PPy and its C1s XPS spectrum (top right) and Si 2p XPS spectrum (bottom right) are shown. In particular, new peaks representing Si and F appear on F-BN@PPy, indicating successful grafting and hydrophobic modification of FAS molecules.

[0067] The C1s XPS spectrum of F-BN@PPy can be divided into five peaks, centered at 283.03 eV, 284.52 eV, 285.78 eV, 288.3 eV, 292.77 eV, and 293.55 eV, representing C-Si, CC, CN, CO, CF2, and CF3, respectively. The Si 2p XPS spectrum of F-BN@PPy is shown below. Figure 3 As shown, the values ​​can be divided into 102.53 eV, 103.23 eV, and 104.03 eV, representing C-Si, O-Si-O, and Si-OH, respectively.

[0068] Figure 4 and 5SEM images of BN@PPy and F-BN@PPy are shown. It can be seen that the particle diameter of F-BN@PPy (150-200 nm) is significantly larger than that of BN@PPy particles before hydrophobic modification (100-200 nm). This indicates that the FAS-grafted silicon shell is uniformly wrapped around the surface of BN@PPy, demonstrating the success of the hydrophobic modification of the particles in this embodiment.

[0069] Figure 6 The image shows a transmission electron microscope (TEM) image of the modified F-BN@PPy. It can be seen that the thickness of the silicon shell coating after hydrophobic modification varies from approximately 10 to 150 nm.

[0070] Figure 7 The image shows the changes in the wettability of BN@PPy powder (left) and modified F-BN@PPy powder after dispersion (middle) and flattening (right). Water droplets on the surface of F-BN@PPy are spherical and do not penetrate into the powder, which means that the hydrophobic modification is successful.

[0071] The average size of the nano-photothermal hydrophobic material was measured by scanning electron microscopy and transmission electron microscopy. The overall particle size distribution was 100-300 nm.

[0072] Example 2

[0073] The nanophotothermal materials in this embodiment are polypyrrole-functionalized boron nitride (BN@PPy), polypyrrole-functionalized carbon powder (C@PPy), polypyrrole-functionalized boron carbide (B4C@PPy), polypyrrole-functionalized molybdenum disulfide (MoS2@PPy), and polypyrrole-functionalized molybdenum carbide (Mo2C@PPy).

[0074] The preparation method of the nano-photothermal material in this embodiment is as follows:

[0075] First, the surfactant sodium dodecylbenzenesulfonate (SDBS, 0.04 g) and different contents of nano carbon powder (C, 0.15 g), nano hexagonal boron nitride (BN, 0.3 g), nano boron carbide (B4C, 0.3 g), nano molybdenum disulfide (MoS2, 0.5 g) and nano molybdenum carbide (Mo2C, 0.3 g) were respectively immersed in 40 mL of pyrrole (Py) monomer aqueous solution (0.3 M) and stirred for 30 minutes.

[0076] Then add 40 ml of FeCl3·6H2O (0.3 M) solution and stir for 1 h to initiate the polymerization reaction.

[0077] Finally, the obtained samples were washed multiple times with deionized water and anhydrous ethanol, and then placed in a vacuum drying oven and dried at 60°C for 12 hours to obtain black C@PPy, BN@PPy, B4C@PPy, MoS2@PPy and Mo2C@PPy powder samples.

[0078] Testing and Characterization:

[0079] To test the coating of PPy with nano-carbon powder (C), nano-boron nitride (BN), nano-boron carbide (B4C), nano-molybdenum disulfide (MoS2), and nano-molybdenum carbide (Mo2C) and to examine their morphology and structure, scanning electron microscopy (SEM) and XPS analysis were performed on the nano-photothermal materials.

[0080] Scanning electron microscope images as follows Figure 8 As shown, PPy particles are microspheres with a diameter of approximately 100m to 120nm, further proving that Py monomers were successfully polymerized after oxidation.

[0081] The image shows that the surface of the nanomaterial exhibits a rough planar structure with small protrusions. This structure can increase the absorption area of ​​sunlight and the high light absorption performance of PPy across the entire spectrum. This also indicates that PPy has successfully functionalized the aforementioned nanomaterial.

[0082] The nano-photothermal material of this embodiment was placed inside an insulated container, and a xenon lamp was used to simulate the intensity of one sun (1 sun, 96 mW / cm²). 2 The sample was irradiated, and infrared thermal imagers were used to record data at 30-second intervals. The test results are as follows: Figure 9 As shown, the nano-photothermal material in this embodiment can reach over 70°C within 5 minutes, with a maximum C@PPy temperature of 85°C. This satisfies its function as a photothermal agent when applied in coatings.

[0083] C@PPy, BN@PPy, B4C@PPy, MoS2@PPy, and Mo2C@PPy, coated with a silica shell and grafted with fluorinated silane according to the method of Example 1, have a particle size distribution of 100-300 nm and exhibit superhydrophobic properties.

[0084] Example 3

[0085] A photothermal superhydrophobic coating was prepared using fluorine-modified polypyrrole-functionalized boron nitride (F-BN@PPy) as described in Example 1.

[0086] Add 1 ml of butyl acetate to 0.1 g of silicone resin and stir thoroughly for 15 min. Then add 0.1 g of nano-photothermal hydrophobic material and sonicate until uniformly distributed. Spray the superhydrophobic photothermal coating onto tinplate that has been ultrasonically cleaned with alcohol and place it on an electric heating platform at 60 degrees Celsius for 1 hour to obtain the superhydrophobic photothermal coating.

[0087] Testing and Characterization:

[0088] The surface of the superhydrophobic coating was characterized using scanning electron microscopy, such as... Figure 10As shown, the coating surface has an uneven micro-nano structure, which indicates that the coating surface retains the micro-nano structure characteristics of the nano-photothermal hydrophobic material, thus demonstrating that the coating retains the corresponding hydrophobic properties.

[0089] The image obtained from the test using a contact angle measuring instrument is as follows: Figure 11 As shown, the coating exhibits superhydrophobic properties. A self-cleaning test was performed on the coating, as shown... Figure 12 As shown, its self-cleaning performance is significant, indicating that the modified coating possesses self-cleaning properties.

[0090] Simultaneously, the coating was placed on a cooling platform set to -40°C. After the temperature stabilized, the coating was irradiated with simulated sunlight of 1 sun intensity, and the temperature was recorded using an infrared thermal imager. Figure 13 As shown, the coating has excellent photothermal conversion capability, reaching above 0°C in 60 seconds, and has anti-icing and de-icing properties.

[0091] A photothermal coating prepared with unmodified polypyrrole-functionalized boron nitride (BN@PPy) was used as a control (hereinafter referred to as the "original coating").

[0092] The superhydrophobic modified sample (top) and the original coating (bottom) were frosted on a -40℃ cooling platform, and then de-icing experiments were conducted under 1 Sun light intensity. Figure 14 As can be seen, the ice layer on the coating surface begins to melt within 1 minute, demonstrating a significant de-icing effect of the coating.

[0093] Anti-icing performance was tested by dropping water droplets onto the surfaces of tinplate, the original coating, and the anti-icing coating. Figure 15 It was learned that the anti-icing coating can delay the freezing time of tinplate from 6 seconds to 648 seconds, and the modified coating has excellent anti-icing performance.

[0094] The above characterization demonstrates that the coating can acquire photothermal superhydrophobic properties through simple modification of nano-photothermal hydrophobic materials.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A nano-photothermal hydrophobic material, characterized in that, It is prepared by the following steps: (1) The polypyrrole nanophotothermal material is dispersed in a solvent, and a silane compound is added. The silane compound is hydrolyzed to coat the surface of the polypyrrole nanophotothermal material with a silica shell. The solvent is an aqueous solution of ethanol containing ammonia. The volume content of ethanol in the solvent is 60%-80%, and the content of ammonia is 20-50 g / L. The ratio of polypyrrole nanophotothermal material to solvent is 1 g: 20-200 ml. The ratio of polypyrrole nanophotothermal material to silane compound is 1 g: 0.01-0.10 mol. The silane compound is tetraethyl orthosilicate; (2) Add fluorinated silane and graft the fluorinated silane onto the silicon shell to obtain nano-photothermal hydrophobic material; The ratio of polypyrrole nanophotothermal material to fluorinated silane is 1g:0.001mol-0.15mol; The nano-photothermal hydrophobic material uses polypyrrole nano-photothermal material as the core and is coated with a fluorinated silane-modified silica layer on the surface; the particle size of the nano-photothermal hydrophobic material is 100-300nm. Among them, polypyrrole nanophotothermal materials are photothermal nanomaterials modified with polypyrrole; Polypyrrole nanophotothermal materials are in granular form; the average particle size of polypyrrole nanophotothermal materials is 50-250 nm. The polypyrrole particles are microspheres with a diameter of 100-120 nm; the surface of the polypyrrole-modified photothermal nanomaterials exhibits a rough planar structure with small protrusions. A fluorinated silane-grafted silica layer is uniformly coated on the surface of the polypyrrole nanophotothermal material, giving the nanophotothermal hydrophobic material particles an uneven, hydrophobic micro-nano rough structure. The photothermal nanomaterial is selected from one or more of nano-carbon powder, nano-boron carbide, nano-molybdenum disulfide, and nano-molybdenum carbide; the fluorinated silane is selected from one or more of 1H,1H,2H,2H-perfluorodecyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, and heptadecafluorodecyltripropoxysilane.

2. The nano-photothermal hydrophobic material according to claim 1, characterized in that, Polypyrrole nanophotothermal materials are prepared by in-situ polymerization of pyrrole and nanomaterials.

3. A photothermal hydrophobic coating, characterized in that, The nano-photothermal hydrophobic material comprising any one of claims 1-2.

4. Use of the nano-photothermal hydrophobic material according to claim 1 or 2, characterized in that, Used as a coating filler.

Images