Super hydrophobic photothermal conductive coating, preparation method and application thereof

Abstract

The present invention discloses a super-hydrophobic photothermal conductive coating, a preparation method and application thereof. The preparation method comprises the following steps: dispersing carbon nanotubes in N , N ‑Dimethylacetamide obtains suspension, mixes suspension with polyamine solution, obtains electric heating layer casting liquid;The obtained electric heating layer casting liquid is cast on textile cloth, and PAA / CNTs composite film is obtained after drying;Adhesive is mixed with ethyl acetate, and micron silicon dioxide and nano photothermal material are added thereto to obtain super-hydrophobic photothermal and electrical insulating layer mixed solution;The above-mentioned obtained PAA / CNTs composite film is immersed in super-hydrophobic photothermal and electrical insulating layer mixed solution to obtain super-hydrophobic photothermal conductive coating. The coating prepared by the present invention has anti-icing and deicing functions, and can reach the effect of rapid deicing in the case of power-on and natural light and heat, solves the problem that the surface micro-nano structure is destroyed after multiple freezing cycles of traditional super-hydrophobic surface, and the surface layer has the advantages of power safety and energy saving.

Description

Technical Field

[0001] The present invention relates to the technical field of functional coating materials, and in particular to a super-hydrophobic photothermal conductive coating, a preparation method thereof and applications thereof. Background Art

[0002] In winter, in low-temperature outdoor environments, raindrops will freeze on the surface of objects, causing inconvenience to all walks of life. This not only increases the energy consumption of engineering equipment, reduces the heat exchange efficiency of equipment, but also affects the safety of life and property. For example, the ice disaster in 2008 had a great impact on the whole of China. Most provinces in my country suffered a lot of economic losses. The paralysis of the power grid, the icing of transportation, the icing of roads, the icing of daily necessities, etc., all brought great inconvenience to humans. Among them, the losses caused by the icing of the power grid accounted for the majority. Because ice will bring many social or life problems, deicing is also a problem that people need to face.

[0003] Inspired by the structures of lotus leaf surface and butterfly wing surface, people have prepared micro-nano structures to achieve super-hydrophobic effect. With the development of science and the in-depth study of super-hydrophobic surface by researchers, people are paying more and more attention to the application of super-hydrophobic surface in anti-icing. Super-hydrophobic surface can effectively reduce the adhesion of water droplets, thereby prolonging the freezing time, and fundamentally preventing and inhibiting the occurrence of icing. Therefore, super-hydrophobic materials have excellent anti-icing properties and can be used in aircraft, roads, transmission lines and other fields that require anti-icing.

[0004] Anti-icing technology can be divided into passive anti-icing technology and active anti-icing technology. Among them, passive anti-icing technology mainly includes coating super-hydrophobic surface and super-slippery surface. The super-hydrophobic surface has a unique micro-nano rough structure to form a unique air cushion structure that can reduce the adhesion of ice. In the case of static icing, it can greatly delay the icing time, but the super-hydrophobic surface is in the case of dynamic icing. The super-hydrophobic coating is easily scratched and loses its super-hydrophobicity, and then loses the anti-icing effect, and cannot achieve complete anti-icing. Active anti-icing includes electric heating, photothermal and other technologies. Electric heating technology converts electrical energy into thermal energy, and the heat is transferred to the surface through the material, heating and melting the ice surface, reducing the adhesion of ice, and realizing surface anti-icing; photothermal technology uses natural light that can be seen everywhere in daily life to irradiate and heat the surface with photothermal properties, and then heats and melts the ice surface. However, when there is no energy input, the electric heating and photothermal surfaces do not have the performance of reducing the adhesion of ice, so the current active anti-icing technology and passive anti-icing technology are not ideal for anti-icing. Summary of the invention

[0005] In view of the problem that the active anti-icing technology and passive anti-icing technology in the prior art are not ideal in terms of anti-icing and deicing effects, the present invention provides a super-hydrophobic photothermal conductive coating, a preparation method and application thereof. The present invention combines active anti-icing technology with passive anti-icing technology to extend the icing time of the coating surface and improve deicing efficiency.

[0006] In order to achieve the above object, the first aspect of the present invention provides a method for preparing a super-hydrophobic photothermal conductive coating, the preparation method comprising the following steps:

[0007] S1. Disperse carbon nanotubes in N , N - dimethylacetamide to obtain a suspension, and mixing the suspension with a polyurethane solution to obtain a casting solution for an electric heating layer;

[0008] S2, casting the electric heating layer casting liquid obtained in step S1 on a textile cloth, and obtaining a PAA / CNTs composite membrane after drying;

[0009] S3, mixing the adhesive and ethyl acetate evenly, and then adding micron silicon dioxide and nano-photothermal material to prepare a super-hydrophobic photothermal and electrical insulating layer mixed solution;

[0010] S4, immersing the PAA / CNTs composite film obtained in step S2 in the super-hydrophobic photothermal and electrical insulating layer mixed solution obtained in step S3 to obtain a super-hydrophobic photothermal and electrical conductive coating.

[0011] The super-hydrophobic photothermal conductive coating of the present invention is a sandwich structure, which comprises a super-hydrophobic photothermal electrical insulating layer, an electric heating layer and a textile fabric from the outside to the inside.

[0012] The super-hydrophobic photothermal electrically insulating layer of the outermost layer of the super-hydrophobic photothermal conductive coating prepared by the present invention can change the coating temperature by the intensity and power of sunlight, so that the coating temperature is kept above the freezing point, thereby giving the coating anti-icing properties. Under insufficient sunlight conditions, the effect of rapid deicing can be achieved by the electrothermal effect of the electric heating layer. In a more severe environment, the effect of rapid deicing can also be achieved by combining the photothermal effect of the super-hydrophobic photothermal electrically insulating layer with the electrothermal effect of the electric heating layer. In the above process, the super-hydrophobic photothermal electrically insulating layer and the electric heating layer melt the ice-solid contact surface into an ice-liquid-solid contact surface, and the melted water acts as a lubricant to prevent the ice layer from directly contacting the coating to achieve the purpose of deicing.

[0013] The present invention solves the problem that the surface of outdoor equipment cannot operate stably for a long time due to ice formation under different environmental conditions by combining photothermal and electric heating. At the same time, since the chemical bonds of all carbon atoms are linked, there is no need to perform a chemical passivation process to eliminate the dangling bonds on the surface. Coating the surface of carbon nanotubes with silicon dioxide can form an effective thermal conductive network, which not only gives the thermal conductive filler good electrical insulation, but also reduces the modulus mismatch between the thermal conductive filler and the polymer, reduces the interfacial thermal resistance, and improves the thermal conductivity of the composite material, solving the problem between high thermal conductivity and electrical insulation. The outermost super-hydrophobic photothermal and electrical insulating layer ensures the safety of electricity use.

[0014] Specifically, in step S1, the carbon nanotubes are treated as follows before being dispersed: the carbon nanotubes are added to a HNO3 / H2SO4 mixed solution, washed to neutrality and then dried.

[0015] Specifically, in step S1, relative to 100 mL of N , N -dimethylacetamide, the amount of the carbon nanotubes is 1-3.5 g, and the amount of the polyamino acid is 75-85 g.

[0016] The preparation method of the polyamino acid solution is as follows: under the action of dry nitrogen flow, 4,4'-oxydiphenylamine solution and pyromellitic anhydride powder are uniformly mixed to obtain the polyamino acid solution. The molar ratio of pyromellitic anhydride to 4,4'-oxydiphenylamine is preferably 1:1.

[0017] Specifically, in step S3, the mass ratio of the adhesive to the ethyl acetate is (1-2):50; and / or the adhesive is one or more of SEBS, epoxy resin, polyurethane and polyacrylic resin.

[0018] Specifically, in step S3, the mass ratio of the micron silicon dioxide to the nano biochar is (4.2-4.5):1.

[0019] Specifically, in step S3, the nano-photothermal material is a carbon material, a black metal oxide, a black polymer, nanoparticles or MXene.

[0020] Furthermore, the carbon material is one or more of biochar, graphite, carbon nanotubes and graphene oxide; and / or the black metal oxide is one or two of ferroferric oxide and copper oxide; and / or the black polymer is polypyrrole; and / or the nanoparticles are one or more of nanogold, nanosilver and nanoaluminum, and the particle size of the nanoparticles is ≤50nm.

[0021] Specifically, in step S4, the soaking adopts a one-step soaking method, and the soaking time is 3 to 10 minutes.

[0022] A second aspect of the present invention provides a super-hydrophobic photothermal conductive coating prepared by the above preparation method.

[0023] A third aspect of the present invention provides an application of the above-mentioned super-hydrophobic photothermal conductive coating in the preparation of anti-icing or deicing surfaces.

[0024] Through the above technical solution, the present invention achieves the following beneficial effects:

[0025] The present invention prepares a coating that combines the functions of super-hydrophobic, photothermal effect, and electrothermal effect. The coating has anti-icing and deicing functions, and can achieve the effect of rapid deicing under power-on and natural light and heat conditions. The preparation method is simple and has a wide range of applications. It realizes the combination of super-hydrophobic anti-icing, photothermal deicing, and electrothermal deicing, and solves the problems caused by the destruction of the surface micro-nano structure and the lack of lubricant on the lubricating surface after multiple icing cycles on the traditional super-hydrophobic surface, and the surface layer has the advantages of safe electricity use and energy saving. The super-hydrophobic photothermal conductive coating prepared by the present invention can be widely used in the fields of aviation, chemical industry, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 a is a photothermal temperature rise and drop performance diagram of the super-hydrophobic photothermal conductive coating prepared in Example 1 of the present invention under different solar light intensities; b is an electrothermal temperature rise and drop performance diagram of the super-hydrophobic photothermal conductive coating prepared in Example 1 of the present invention under different powers; c is a temperature rise and drop performance diagram of the super-hydrophobic photothermal conductive coating prepared in Example 1 of the present invention under 0.25 W electrothermal assisted with different solar light intensities; d is a temperature rise and drop change diagram of the super-hydrophobic photothermal conductive coating prepared in Example 1 of the present invention during the freezing cycle under 0.25 W electrothermal and 0.5 sun photothermal conditions.

[0027] Figure 2 The contact angle and rolling angle diagram of the super-hydrophobic photothermal conductive coating prepared in Example 1.

[0028] Figure 3 This is a contact angle diagram of the super-hydrophobic photothermal conductive coating prepared in Example 1 after 10 freezing cycles under 0.25 W electric heating and 0.5 sun photothermal conditions.

[0029] Figure 4 The temperature rise and drop performance diagram of the super-hydrophobic photothermal conductive coatings prepared in Examples 1 to 5 and the coatings prepared in Comparative Examples 1 to 6 under 0.25 W electric heating assisted by 0.5 sun photothermal conditions. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the examples. It should be understood that the specific implementation described herein is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] In the following examples, the method for preparing biochar is as follows: using corn stalks as raw materials, cross-linking the corn stalks with citric acid, and further activating the corn stalks with KOH to prepare a porous biochar material derived from corn stalks.

[0032] The preparation method of the polyamine solution (polyamine concentration is 24wt%) is as follows: firstly, pyromellitic anhydride and 4,4'-oxydiphenylamine are purified by vacuum sublimation method, and then, under the action of dry nitrogen flow, the 24wt% 4,4'-oxydiphenylamine solution and pyromellitic anhydride powder (the molar ratio of 4,4'-oxydiphenylamine to pyromellitic anhydride is 1:1) are mixed evenly to obtain the polyamine solution.

[0033] Example 1

[0034] The preparation of super-hydrophobic photothermal conductive coating includes the following steps:

[0035] (1) Add 4 g of carbon nanotubes into 100 mL of HNO3 / H2SO4 mixed solution, wash until neutral and then dry;

[0036] (2) Disperse 1g of carbon nanotubes in 100ml N , N - dimethylacetamide to obtain a suspension, and then the suspension is mixed with 354g of polyurethane solution to obtain a casting solution for the electric heating layer;

[0037] (3) casting the electric heating layer casting liquid obtained in step (2) onto a textile fabric, and obtaining a PAA / CNTs composite membrane after drying;

[0038] (4) 1 g of SEBS was mixed evenly with 50 g of ethyl acetate, and then 4.2 g of micronized silica and 1 g of biochar were added to prepare a super-hydrophobic photothermal and electrical insulating layer mixture;

[0039] (5) The PAA / CNTs composite film prepared in step (3) is immersed in the super-hydrophobic photothermal and electrical insulating layer mixed solution prepared in step (4) for 3 minutes to obtain a super-hydrophobic photothermal and electrical conductive coating.

[0040] Example 2

[0041] The preparation of super-hydrophobic photothermal conductive coating includes the following steps:

[0042] (1) Add 4 g of carbon nanotubes into 100 mL of HNO3 / H2SO4 mixed solution, wash until neutral and then dry;

[0043] (2) Disperse 3.5 g of carbon nanotubes in 100 ml N , N- dimethylacetamide to obtain a suspension, and then the suspension is mixed with 312 g of polyurethane solution to obtain a casting solution for the electric heating layer;

[0044] (3) casting the electric heating layer casting liquid obtained in step (2) onto a textile fabric, and obtaining a PAA / CNTs composite membrane after drying;

[0045] (4) 1 g epoxy resin, 0.5 g polyurethane, 0.5 g polyacrylic acid resin and 50 g ethyl acetate were mixed evenly, and then 4.5 g micron silica, 0.5 g biochar and 0.5 g graphite were added to prepare a super hydrophobic photothermal and electrical insulation layer mixture;

[0046] (5) The PAA / CNTs composite film prepared in step (3) is immersed in the super-hydrophobic photothermal and electrical insulating layer mixed solution prepared in step (4) for 10 minutes to obtain a super-hydrophobic photothermal and electrical conductive coating.

[0047] Example 3

[0048] The preparation of super-hydrophobic photothermal conductive coating includes the following steps:

[0049] (1) Add 4 g of carbon nanotubes into 100 mL of HNO3 / H2SO4 mixed solution, wash until neutral and then dry;

[0050] (2) Disperse 2g of carbon nanotubes in 100ml N , N - dimethylacetamide to obtain a suspension, and then the suspension is mixed with 335g of polyurethane solution to obtain a casting solution for the electric heating layer;

[0051] (3) casting the electric heating layer casting liquid obtained in step (2) onto a textile fabric, and obtaining a PAA / CNTs composite membrane after drying;

[0052] (4) 0.5 g of SEBS, 1 g of polyurethane and 50 g of ethyl acetate were mixed evenly, and then 4.3 g of micronized silica, 0.2 g of biochar, 0.6 g of carbon nanotubes and 0.2 g of graphene oxide were added to prepare a super-hydrophobic photothermal and electrical insulating layer mixture;

[0053] (5) The PAA / CNTs composite film prepared in step (3) is immersed in the super-hydrophobic photothermal and electrical insulating layer mixed solution prepared in step (4) for 7 minutes to obtain a super-hydrophobic photothermal and electrical conductive coating.

[0054] Example 4

[0055] The preparation of super-hydrophobic photothermal conductive coating includes the following steps:

[0056] (1) Add 4 g of carbon nanotubes into 100 mL of HNO3 / H2SO4 mixed solution, wash until neutral and then dry;

[0057] (2) Disperse 3g of carbon nanotubes in 100ml N , N - dimethylacetamide to obtain a suspension, and then the suspension is mixed with 335g of polyurethane solution to obtain a casting solution for the electric heating layer;

[0058] (3) casting the electric heating layer casting liquid obtained in step (2) onto a textile fabric, and obtaining a PAA / CNTs composite membrane after drying;

[0059] (4) 0.5 g SEBS, 1 g epoxy resin and 50 g ethyl acetate were mixed evenly, and then 4.4 g micron silica and 1 g MXene were added to prepare a super-hydrophobic photothermal and electrical insulating layer mixture;

[0060] (5) The PAA / CNTs composite film prepared in step (3) is immersed in the super-hydrophobic photothermal and electrical insulating layer mixed solution prepared in step (4) for 6 minutes to obtain a super-hydrophobic photothermal and electrical conductive coating.

[0061] Example 5

[0062] The preparation of super-hydrophobic photothermal conductive coating includes the following steps:

[0063] (1) Add 4 g of carbon nanotubes into 100 mL of HNO3 / H2SO4 mixed solution, wash until neutral and then dry;

[0064] (2) Disperse 1.5 g of carbon nanotubes in 100 ml N , N - dimethylacetamide to obtain a suspension, and then the suspension is mixed with 325g of polyurethane solution to obtain a casting solution for the electric heating layer;

[0065] (3) casting the electric heating layer casting liquid obtained in step (2) onto a textile fabric, and obtaining a PAA / CNTs composite membrane after drying;

[0066] (4) 1 g of polyacrylic acid resin, 1 g of polyurethane and 50 g of ethyl acetate were mixed evenly, and then 4.2 g of micronized silicon dioxide, 0.5 g of ferroferric oxide and 0.5 g of copper oxide were added to prepare a super-hydrophobic photothermal and electrical insulating layer mixture;

[0067] (5) The PAA / CNTs composite film prepared in step (3) is immersed in the super-hydrophobic photothermal and electrical insulating layer mixed solution prepared in step (4) for 5 minutes to obtain a super-hydrophobic photothermal and electrical conductive coating.

[0068] Comparative Example 1

[0069] Other conditions were the same as in Example 1, except that no micronized silicon dioxide was added.

[0070] Comparative Example 2

[0071] Other conditions were the same as in Example 1, except that no carbon nanotubes were added.

[0072] Comparative Example 3

[0073] Other conditions were the same as in Example 1, except that no biochar was added.

[0074] Comparative Example 4

[0075] Other conditions were the same as in Example 1, except that carbon nanotubes and biochar were not added.

[0076] Comparative Example 5

[0077] Other conditions were the same as in Example 1, except that microsilica and biochar were not added.

[0078] Comparative Example 6

[0079] Other conditions are the same as those in Example 1, except that micronized silicon dioxide and carbon nanotubes are not added.

[0080] Performance Testing

[0081] Freezing cycle experiment: The coatings prepared in Examples 1 to 5 and the coatings prepared in Comparative Examples 1 to 6 were subjected to 10 freezing cycles under 0.25 W electric heating and 0.5 sun light heating conditions. The contact angles before and after the freezing cycle are shown in Table 1:

[0082] Table 1 Contact angles before and after freezing cycle of the embodiments and comparative examples

[0083] Contact angle before freezing cycle (°) Contact angle after freezing cycle (°) Example 1 162.18 158.52 Example 2 161.15 156.78 Example 3 162 157.2 Example 4 160.26 155.82 Example 5 160.84 155.67 Comparative Example 1 156.64 151.32 Comparative Example 2 156.45 149.68 Comparative Example 3 154.87 148.32 Comparative Example 4 153.66 145.68 Comparative Example 5 153.46 147.65 Comparative Example 6 152.42 146.58

[0084] from Figure 1 It can be seen from a that the super-hydrophobic photothermal conductive coating prepared in Example 1 of the present invention has a surface temperature of about 1°C after 83s under 0.8s irradiation intensity; and a surface temperature of about 5°C after 46s under 1.2s irradiation intensity, indicating that the super-hydrophobic photothermal conductive coating prepared in the present invention can change the coating temperature through the intensity and power of sunlight, so that the coating temperature is kept above the freezing point, thereby giving the coating anti-icing properties. Figure 1b It can be seen that the surface temperature of the super-hydrophobic photothermal conductive coating prepared in Example 1 of the present invention rises to about 5°C after 185s under 0.35W electric heating; and rises to above 40°C after 74s under 0.55W electric heating, indicating that under insufficient sunlight, the super-hydrophobic photothermal conductive coating prepared in the present invention can achieve the effect of rapid deicing through the electric heating effect of the electric heating layer. Figure 1 c It can be seen that the super hydrophobic photothermal conductive coating prepared in Example 1 of the present invention, under the condition of 0.25W electric heating and 0.5sun sunlight intensity, the surface temperature of the coating rises to about 17°C after 112s, while the temperature of the coating without sunlight auxiliary irradiation is maintained below 0°C, indicating that the present invention can make the coating surface rise to a higher temperature through the combination of electric heating and photothermal, and the deicing effect is better. Figure 1 It can be seen from the figure that the super-hydrophobic photothermal conductive coating prepared in Example 1 was subjected to an icing cycle under 0.25 W electric heating and 0.5 sun photothermal conditions. During this process, the surface temperature of the coating rose rapidly from about -10 ° C to 23 ° C. Within a given time of 950 s, 10 increase and decrease heating processes could be stably observed, indicating that the heating performance of the super-hydrophobic photothermal conductive coating prepared by the present invention has sufficient thermal stability and repeatability.

[0085] Comparing Example 1 with Comparative Example 1, it can be seen from Table 1 that the contact angle of the super-hydrophobic photothermal conductive coating prepared in Example 1 is 162.18°, which is higher than the requirement of more than 150° for the super-hydrophobic surface, and the coating has excellent super-hydrophobic performance; while the contact angle of the coating prepared in Comparative Example 1 is only 156.64°, indicating that the addition of micronized silica can increase the contact angle of the coating surface.

[0086] Comparing Example 1 with Comparative Example 2, Figure 4 It can be seen that when the ambient temperature is -12°C, under the conditions of 0.25W electric heating assisted by 0.5sun photothermal conditions, the surface temperature of the coating prepared in Example 1 rises to 17°C after 132s, and the surface temperature of the coating prepared in Comparative Example 2 rises to -3.6°C after 56s. The surface temperature of the coating prepared in Example 1 is 20.6°C higher than that of Comparative Example 2, indicating that the addition of carbon nanotubes increases the temperature of the coating surface. At the same time, the temperature of the superhydrophobic photothermal conductive coating is maintained at around 17°C after heating, which is much higher than the freezing point. While giving the coating anti-icing properties, it can also achieve the purpose of rapid deicing in a relatively short time.

[0087] Comparative Example 1 and Comparative Example 3, from Figure 4It can be seen that when the ambient temperature is -12°C, under the conditions of 0.25W electric heating assisted by 0.5sun photothermal conditions, the surface temperature of the coating prepared in Example 1 rises to 17°C after 132s, and then is continuously irradiated for 468s, and the surface temperature of the coating is maintained at about 17°C; the surface temperature of the coating prepared in Comparative Example 3 rises to -5.5°C after 74s, and then is continuously irradiated for 526s, and the surface temperature of the coating is maintained at about -5.5°C. The surface temperature of the coating prepared in Example 1 is 22.5°C higher than that of Comparative Example 3, indicating that under the auxiliary irradiation of sunlight, the super-hydrophobic photothermal conductive coating prepared by the present invention can achieve high surface temperature under low-power electric heating, and the super-hydrophobic photothermal conductive coating prepared by the present invention utilizes sunlight to save electricity to the maximum extent.

[0088] Comparing Example 1 with Comparative Example 4, it can be seen from Table 1 that the contact angle of the coating prepared in Example 1 is 162.18°. After 10 freezing cycles, the contact angle of Example 1 can still reach 158.52°, and its contact angle is only 3.66° lower than before the freezing cycle. The contact angle of the coating prepared in Comparative Example 4 after 10 freezing cycles is only 145.68°, and it no longer has super hydrophobic properties. This shows that the coating prepared by the present invention can still maintain its super hydrophobicity after multiple freezing cycles. The reason is that during the freezing process of the droplet, the solubility of air in ice is rapidly degraded to form a solid-gas eutectic, resulting in a large number of bubbles frozen in the ice ball. The bubbles in the ice ball are subjected to the surface tension under the temperature gradient between melting and unmelting, and quickly impact the bottom, promoting the recovery of a large number of small air cells of micro-nano structures at the bottom, thereby realizing the recovery of the droplet from the Wenzel state to the original Cassie state.

[0089] Comparing Example 1 with Comparative Example 5, it can be seen from Table 1 that the contact angle of the coating prepared in Comparative Example 5 is 153.46°, indicating that the addition of micron silicon dioxide and nano-biochar gives the coating surface a micro-nano structure, thereby improving the super-hydrophobicity of the coating surface.

[0090] Comparing Example 1 with Comparative Example 6, it can be seen from Table 1 that the contact angle of the coating prepared in Comparative Example 6 is 152.42°, indicating that the addition of micronized silicon dioxide gives the coating surface a micro-nano structure, thereby improving the super-hydrophobicity of the coating surface, while the addition of carbon nanotubes gives the coating surface electric heating, so that the coating prepared by the present invention can still maintain its super-hydrophobicity after multiple freezing cycles.

[0091] In summary, the combination of superhydrophobic, photothermal and electrothermal materials can achieve better anti-icing / de-icing effects.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for preparing a super-hydrophobic photothermal conductive coating, characterized in that: The preparation method comprises the following steps: S1. Disperse carbon nanotubes in N , N - obtain a suspension in dimethylacetamide, and mix the suspension with a polyurethane solution to obtain a casting solution for an electric heating layer; S2, casting the electric heating layer casting liquid obtained in step S1 on a textile cloth, and obtaining a PAA / CNTs composite membrane after drying; S3, mixing the adhesive and ethyl acetate evenly, and then adding micron silicon dioxide and nano-photothermal material to prepare a super-hydrophobic photothermal and electrical insulating layer mixed solution; S4, immersing the PAA / CNTs composite film obtained in step S2 in the super-hydrophobic photothermal and electrical insulating layer mixed solution obtained in step S3, to obtain a super-hydrophobic photothermal and electrical insulating layer, an electrical heating layer, and a textile fabric super-hydrophobic photothermal and electrical conductive coating from outside to inside; In step S3, the nano-photothermal material is a carbon material, a black metal oxide, a black polymer, nanoparticles or Mxene, the carbon material is one or more of biochar, graphite, carbon nanotubes and graphene oxide; the black metal oxide is one or two of ferroferric oxide and copper oxide; the black polymer is polypyrrole; the nanoparticles are one or more of nano-gold, nano-silver and nano-aluminum, and the particle size of the nanoparticles is ≤50 nm.

2. The preparation method according to claim 1, characterized in that: In step S1, the carbon nanotubes are treated as follows before being dispersed: the carbon nanotubes are added to a HNO3 / H2SO4 mixed solution, washed to neutrality and then dried.

3. The preparation method according to claim 1, characterized in that: In step S1, relative to 100 mL N , N -dimethylacetamide, the amount of the carbon nanotubes is 1-3.5 g, and the amount of the polyamino acid is 75-85 g.

4. The preparation method according to claim 1, characterized in that: In step S3, the mass ratio of the adhesive to the ethyl acetate is (1-2):50; and / or The adhesive is one or more of SEBS, epoxy resin, polyurethane and polyacrylic resin.

5. The preparation method according to claim 1, characterized in that: In step S3, the mass ratio of the micron silicon dioxide to the nano-photothermal material is (4.2-4.5):

1.

6. The preparation method according to claim 1, characterized in that: In step S4, the soaking adopts a one-step soaking method, and the soaking time is 3 to 10 minutes.

7. A super-hydrophobic photothermal conductive coating, characterized in that: Prepared by the preparation method according to any one of claims 1 to 6.

8. Use of the super-hydrophobic photothermal conductive coating according to claim 7 in preparing anti-icing or deicing surfaces.

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