Photo-thermal super-hydrophobic multifunctional anti-icing coating as well as preparation method and application thereof

Abstract

The invention relates to a photo-thermal super-hydrophobic multifunctional anti-icing coating as well as a preparation method and application thereof. The photo-thermal super-hydrophobic multifunctional anti-icing coating comprises primer and finish paint, the primer comprises the following raw materials in parts by weight: 20-25 parts of bisphenol A type epoxy resin and / or fluorine modified epoxy resin, 10-20 parts of fluorine modified polyacrylic resin and / or polyurethane resin, 5-10 parts of a curing agent and 40-55 parts of a solvent; the finish paint comprises the following components in parts by weight: 2-5 parts of polytetrafluoroethylene, 1-3 parts of soluble polytetrafluoroethylene, 1-5 parts of polydimethylsiloxane and 85-90 parts of fluorinated MOF dispersion liquid. Compared with the prior art, the photo-thermal super-hydrophobic multifunctional anti-icing coating provided by the invention has the characteristics of super-hydrophobicity, rapid ice melting, wear resistance, reduction of ice adhesion strength and reduction of icing amount, can effectively solve the problem of icing of an aluminum conductor of a power transmission line of a power system, and can be applied to power equipment such as the aluminum conductor of the power transmission line.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, and in particular to a photothermal super-hydrophobic multifunctional anti-icing coating and a preparation method and application thereof. Background Art

[0002] Ice and frost accumulation on materials can cause serious safety and economic problems. Consequently, efficient anti-icing or de-icing technologies and materials are of great interest in various industrial and commercial applications, such as aircraft, power lines, and vehicles.

[0003] Traditional active anti-icing or de-icing strategies include thermal melting, the use of anti-icing chemicals, and mechanical vibration, but these methods consume a lot of human resources, materials, and energy.

[0004] In contrast, passive anti-icing coatings can delay ice formation, reduce freezing temperatures, and ice adhesion, while also offering environmental and cost-effective advantages. In recent years, superhydrophobic surfaces with high contact angles and low sliding angles have attracted considerable attention for passive anti-icing. This is because the insulating air cushion at the solid-liquid interface can (i) hinder ice formation by significantly reducing the solid-liquid contact area and contact time, and (ii) act as an inherent crack after freezing. As a result, the freezing time of water can be significantly delayed, and the adhesion strength of ice can be significantly reduced. However, the application of superhydrophobic coatings for anti-icing remains challenging, primarily because superhydrophobicity is lost at subzero temperatures and high humidity. Therefore, superhydrophobic coatings can only temporarily delay ice formation. After prolonged exposure to supercooled water, it is difficult for superhydrophobic surfaces to avoid ice formation, and deicing on superhydrophobic surfaces still requires a long time. Therefore, ideally, a superhydrophobic surface would have both passive anti-icing and active deicing properties.

[0005] Photothermal superhydrophobic coatings have superhydrophobicity and photothermal effect, representing passive anti-icing surfaces with active deicing properties. Superhydrophobicity can delay ice formation and reduce the adhesion strength of ice. At the same time, the photothermal effect (active deicing) can heat the coating to remove temporarily formed ice. In recent years, a variety of photothermal anti-icing / deicing surfaces have been constructed based on various types of photothermal conversion materials, such as carbon materials, two-dimensional materials, plasma materials, and magnetic nanoparticles, which can generate heat energy under sunlight and effectively melt ice and frost.

[0006] However, there are still some problems that need to be solved. For example, many photothermal nanomaterials cannot be directly prepared into hierarchical micro-nanostructured surfaces, requiring complex preparation processes. In addition, although most photothermal surfaces exhibit excellent deicing performance, they often show poor ice delay characteristics at low temperatures. Moreover, most hierarchical micro-nanostructured photothermal anti-icing / deicing surfaces still have some limitations, such as poor practical application and durability.

[0007] Chinese patent CN113861842A discloses an energy-absorbing, super-hydrophobic, anti-icing coating for insulators and its preparation method. This coating technology involves a primer and a topcoat. The primer consists of 10-20 parts fluorosilicone resin and / or fluorocarbon resin, 20-25 parts epoxy resin and / or acrylic resin, 10-15 parts inorganic filler, and 40-50 parts solvent; the topcoat consists of 2-5 parts polytetrafluoroethylene powder, 1-2 parts carbon black, 1-3 parts titanium dioxide, and 90-96 parts modified nano-silica dispersion. This solution is relatively simple in terms of function and performance, and does not clearly address key issues such as wear resistance and ice adhesion strength.

[0008] Chinese patent CN113897134A discloses an energy-absorbing, super-hydrophobic, super-oleophobic, anti-icing coating for power transmission lines and its preparation method. The coating comprises: 30-70 parts fluorine-modified silicone resin, 5-30 parts polytetrafluoroethylene dispersion, 1-5 parts nano-titanium dioxide, 1-10 parts carbon nanotubes, 5-20 parts modified black iron oxide, 0.1-2 parts silane coupling agent, 0.1-1 part dispersant, 0.1-1 part leveling agent, 0.1-2 parts defoaming agent, and 0.01-0.5 parts perfluorosilicone oil. While this solution offers certain advantages in super-hydrophobicity and anti-icing properties, its anti-icing mechanism is limited, lacking photothermal functionality, and suffers from deficiencies in wear resistance and ice adhesion. Summary of the Invention

[0009] The purpose of the present invention is to provide a photothermal super-hydrophobic multifunctional anti-icing coating, its preparation method, and application. The coating has an inherent hierarchical micro-nanostructure and exhibits excellent ice delay and de-icing performance. The coating is characterized by super-hydrophobicity, rapid ice melting, wear resistance, reduced ice adhesion, and reduced ice accumulation. It can effectively address the problem of icing on aluminum conductors in power transmission lines and can be applied to power equipment such as aluminum conductors in transmission lines.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] A photothermal super-hydrophobic multifunctional anti-icing coating comprises a primer and a topcoat, wherein the primer and the topcoat respectively comprise the following raw materials in parts by weight:

[0012] Primer: 20-25 parts of bisphenol A epoxy resin and / or fluorine-modified epoxy resin, 10-20 parts of fluorine-modified polyacrylic resin and / or polyurethane resin, 5-10 parts of curing agent, 40-55 parts of solvent;

[0013] Topcoat: 2-5 parts of polytetrafluoroethylene, 1-3 parts of soluble polytetrafluoroethylene, 1-5 parts of polydimethylsiloxane, and 85-90 parts of fluorinated MOF dispersion.

[0014] Furthermore, the curing agent is selected from any one or more of 3-diethylaminopropylamine, 1,3-bis(4-aminophenyl)urea or ethylenediamine.

[0015] Furthermore, the solvent is selected from any one or more of methanol, ethanol, tetrahydrofuran, ethyl acetate or butyl acetate.

[0016] Furthermore, the fluorinated MOF dispersion is selected from any one or more of a fluorinated ZIF-8 ethanol dispersion, a fluorinated ZIF-67 ethanol dispersion, and a fluorinated MOF-5 ethanol dispersion.

[0017] Furthermore, the fluorinated MOF dispersion is prepared as follows:

[0018] Perfluorooctyltriethoxysilane is added to anhydrous ethanol and mixed evenly to obtain a solution, and then a metal organic framework (MOF) is added to the solution, and a fluorinated MOF dispersion is obtained after ultrasonic treatment.

[0019] Furthermore, in the above, the mass ratio of perfluorooctyltriethoxysilane to metal organic framework (MOF) is 1:(2-5).

[0020] Furthermore, in the above, the ultrasonic time is 0.5 to 2 hours, and the ultrasonic temperature is room temperature.

[0021] Furthermore, in the above, the content of the metal organic framework in the fluorinated MOF dispersion is 5-15%.

[0022] Furthermore, the photothermal super-hydrophobic multifunctional anti-icing coating has a thickness of 5 to 80 μm, a static water contact angle of 150 to 169°, and a rolling angle of 1 to 7°.

[0023] The present invention also provides a method for preparing a photothermal super-hydrophobic multifunctional anti-icing coating, the specific steps of which are as follows:

[0024] S1. Primer preparation: bisphenol A epoxy resin and / or fluorine-modified epoxy resin, fluorine-modified polyacrylic resin and / or polyurethane resin, curing agent and solvent are mixed and stirred to obtain a primer coating;

[0025] S2. Topcoat preparation: polytetrafluoroethylene, soluble polytetrafluoroethylene, polydimethylsiloxane and fluorinated MOF dispersion are mixed and stirred to obtain a topcoat coating;

[0026] S3, spraying primer: spraying the primer obtained in step S1 evenly on the substrate, and wait for the primer coating to dry;

[0027] S3, spraying topcoat: spraying the topcoat obtained in step S2 evenly on the surface-dried primer coating obtained in step S3, and obtaining a photothermal super-hydrophobic multifunctional anti-icing coating after drying.

[0028] Furthermore, in step S3, the substrate is aluminum.

[0029] Furthermore, in step S4, the drying conditions are: constant temperature forced air drying at 80-110° C. for 15-40 minutes.

[0030] In addition, the present invention also provides an application of a photothermal super-hydrophobic multifunctional anti-icing coating in an aluminum conductor of a transmission line, wherein the photothermal super-hydrophobic multifunctional anti-icing coating is used for long-term anti-icing and de-icing in the aluminum conductor of a transmission line.

[0031] The principles of the present invention are as follows:

[0032] The primer coating is a mixture of bisphenol A epoxy resin and / or fluorine-modified epoxy resin, fluorine-modified polyacrylic resin and / or polyurethane resin, a curing agent, etc. The combination of bisphenol A epoxy resin and / or fluorine-modified epoxy resin, fluorine-modified polyacrylic resin and / or polyurethane resin and a curing agent gives the primer coating a hydrophobic property. In addition, the mixed system has excellent adhesion properties and can adhere well to different substrates, thereby enabling good adhesion of the topcoat.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] (1) The method for preparing the photothermal super-hydrophobic multifunctional anti-icing coating of the present invention uses fewer raw materials and lower raw material prices, has a simpler formula, and abandons the expensive nanomaterials and complex auxiliary agent systems relied on by traditional methods, thereby reducing raw material costs. The raw material processing of the present invention is simple, reducing production difficulty, and the preparation process is simple, without the need for complex equipment or process control, thereby reducing equipment investment and energy consumption costs and facilitating large-scale preparation.

[0035] (2) The photothermal super-hydrophobic multifunctional anti-icing coating of the present invention has the characteristics of micro / nano structure and low surface energy, and exhibits excellent super-hydrophobicity.

[0036] (3) The photothermal super-hydrophobic multifunctional anti-icing coating of the present invention can convert light energy into heat energy under light conditions, prolong the freezing time or accelerate the melting of ice after freezing, and can effectively solve the icing problem of aluminum conductors in power system transmission lines and can be applied to aluminum conductors in transmission lines.

[0037] (4) Compared with the comparative documents, the present invention realizes the integration of multiple functions such as active anti-icing, wear resistance, and reduction of ice adhesion strength by introducing photothermal function and optimizing coating composition and structure; the photothermal superhydrophobic multifunctional anti-icing coating of the present invention has significant advantages in functional diversity (photothermal, superhydrophobic, wear resistance, reduction of ice adhesion strength, and reduction of ice formation) and formula optimization (fluorinated MOF dispersion, flexible primer formula), and is particularly suitable for the anti-icing needs of aluminum conductors of transmission lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is an SEM image of the surface of the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Example 1 of the present invention;

[0039] Figure 2 This is a contact angle test image of the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Example 1 of the present invention;

[0040] Figure 3 This is a contact angle test picture of the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0041] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] Unless otherwise specified in the present invention, all raw materials used are commercially available.

[0043] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0044] Example 1

[0045] This embodiment provides a photothermal super-hydrophobic multifunctional anti-icing coating, including a primer and a topcoat, wherein the primer and the topcoat respectively include the following raw materials in parts by weight:

[0046] The primer is composed of the following components in parts by weight: 5 parts of bisphenol A epoxy resin, 20 parts of fluorine-modified epoxy resin, 15 parts of fluorine-modified polyacrylic resin, 10 parts of 3-diethylaminopropylamine, and 50 parts of ethyl acetate;

[0047] The topcoat is composed of the following components in parts by weight: 3 parts of polytetrafluoroethylene, 2 parts of soluble polytetrafluoroethylene, 5 parts of polydimethylsiloxane, and 90 parts of fluorinated MOF dispersion.

[0048] In this embodiment, the fluorinated MOF dispersion is an ethanol dispersion of fluorinated ZIF-67, and the content of fluorinated ZIF-67 is 10%;

[0049] The preparation method of fluorinated ZIF-67 ethanol dispersion is as follows:

[0050] 2 parts of perfluorooctyltriethoxysilane were added to 90 parts of anhydrous ethanol and mixed evenly to obtain a solution. Then, 8 parts of ZIF-67 were added to the solution. After ultrasonic treatment at room temperature for 1 hour, an ethanol dispersion of fluorinated ZIF-67 was obtained.

[0051] In addition, this embodiment also provides a method for preparing a photothermal super-hydrophobic multifunctional anti-icing coating, the specific steps of which are as follows:

[0052] S1. Primer preparation: first, fluorine-modified epoxy resin, fluorine-modified polyacrylic resin, 3-diethylaminopropylamine and ethyl acetate are mixed and stirred to obtain a primer coating;

[0053] S2, topcoat preparation: then polytetrafluoroethylene, soluble polytetrafluoroethylene, polydimethylsiloxane and fluorinated ZIF-67 ethanol dispersion are mixed and stirred to obtain a topcoat coating;

[0054] S3, spraying primer: using an air spray gun, spray the primer obtained in step S1 evenly on the aluminum material, and wait until the primer coating is dry, with a coating thickness of 20 μm;

[0055] S4. Spraying topcoat: Spray the topcoat obtained in step S2 on the surface-dried primer coating obtained in step S3, and dry it with a constant temperature of 80° C. and forced air drying for 30 min to obtain a photothermal super-hydrophobic multifunctional anti-icing coating with a coating thickness of 50 μm.

[0056] Example 2

[0057] This embodiment provides a photothermal super-hydrophobic multifunctional anti-icing coating, including a primer and a topcoat, wherein the primer and the topcoat respectively include the following raw materials in parts by weight:

[0058] The primer is composed of the following components in parts by weight: 20 parts of fluorine-modified epoxy resin, 10 parts of fluorine-modified polyacrylic resin, 5 parts of polyurethane resin, 5 parts of 3-diethylaminopropylamine, and 60 parts of butyl acetate;

[0059] The topcoat is composed of the following components in parts by weight: 2 parts of polytetrafluoroethylene, 3 parts of soluble polytetrafluoroethylene, 5 parts of polydimethylsiloxane, and 90 parts of fluorinated MOF dispersion.

[0060] In this embodiment, the fluorinated MOF dispersion is an ethanol dispersion of fluorinated ZIF-8, and the content of fluorinated ZIF-8 is 10%;

[0061] The preparation method of fluorinated ZIF-8 ethanol dispersion is as follows:

[0062] 2 parts of perfluorooctyltriethoxysilane were added to 90 parts of anhydrous ethanol and mixed evenly to obtain a solution. Then, 8 parts of ZIF-8 were added to the solution. After ultrasonic treatment at room temperature for 1 hour, an ethanol dispersion of fluorinated ZIF-8 was obtained.

[0063] In addition, this embodiment also provides a method for preparing a photothermal super-hydrophobic multifunctional anti-icing coating, the specific steps of which are as follows:

[0064] S1. Primer preparation: first, fluorine-modified epoxy resin, fluorine-modified polyacrylic resin, 3-diethylaminopropylamine and butyl acetate are mixed and stirred to obtain a primer coating;

[0065] S2, topcoat preparation: then polytetrafluoroethylene, soluble polytetrafluoroethylene, polydimethylsiloxane and fluorinated ZIF-8 ethanol dispersion are mixed and stirred to obtain a topcoat coating;

[0066] S3, spraying primer: using an air spray gun, spray the primer obtained in step S1 evenly on the aluminum material, and wait until the primer coating is dry, and the coating thickness is 10 μm;

[0067] S4. Spraying topcoat: Spray the topcoat obtained in step S2 on the surface-dried primer coating obtained in step S3, and dry it at a constant temperature of 100° C. with forced air for 20 min to obtain a photothermal super-hydrophobic multifunctional anti-icing coating with a coating thickness of 60 μm.

[0068] Example 3

[0069] This embodiment provides a photothermal super-hydrophobic multifunctional anti-icing coating, including a primer and a topcoat, wherein the primer and the topcoat respectively include the following raw materials in parts by weight:

[0070] The primer is composed of the following components in parts by weight: 20 parts of fluorine-modified epoxy resin, 15 parts of fluorine-modified polyacrylic resin, 5 parts of ethylenediamine, and 60 parts of ethanol;

[0071] The topcoat is composed of the following components in parts by weight: 5 parts of polytetrafluoroethylene, 3 parts of soluble polytetrafluoroethylene, 5 parts of polydimethylsiloxane, and 87 parts of fluorinated MOF dispersion.

[0072] In this embodiment, the fluorinated MOF dispersion is an ethanol dispersion of fluorinated MOF-5, and the content of fluorinated MOF-5 is 10%;

[0073] The preparation method of fluorinated MOF-5 ethanol dispersion is as follows:

[0074] 2 parts of perfluorooctyltriethoxysilane were added to 90 parts of anhydrous ethanol and mixed uniformly to obtain a solution. Then, 8 parts of MOF-5 were added to the solution, and ultrasonic treatment was performed at room temperature for 1 hour to obtain an ethanol dispersion of fluorinated MOF-5.

[0075] In addition, this embodiment also provides a method for preparing a photothermal super-hydrophobic multifunctional anti-icing coating, the specific steps of which are as follows:

[0076] S1. Primer preparation: first, fluorine-modified epoxy resin, fluorine-modified polyacrylic resin, ethylenediamine and ethanol are mixed and stirred evenly to obtain a primer coating;

[0077] S2, topcoat preparation: then polytetrafluoroethylene, soluble polytetrafluoroethylene, polydimethylsiloxane and ethanol dispersion of fluorinated MOF-5 are mixed and stirred to obtain a topcoat coating;

[0078] S3, spraying primer: using an air spray gun, spray the primer obtained in step S1 evenly on the aluminum material, and wait until the primer coating is dry, with a coating thickness of 30 μm;

[0079] S4. Spraying topcoat: Spray the topcoat obtained in step S2 on the surface-dried primer coating obtained in step S3, and dry it with a constant temperature of 110° C. and forced air drying for 15 minutes to obtain a photothermal super-hydrophobic multifunctional anti-icing coating with a coating thickness of 60 μm.

[0080] Comparative Example 1

[0081] This comparative example provides a coating, which is the same as Example 1 except that the fluorine-modified epoxy resin in the primer is replaced by polyacrylic resin.

[0082] Comparative Example 2

[0083] This comparative example provides a coating, which is the same as Example 1 except that the corresponding content of soluble polytetrafluoroethylene in the topcoat is replaced with polytetrafluoroethylene.

[0084] In order to illustrate the effect of the photothermal super-hydrophobic multifunctional anti-icing coating provided in this application, the following tests were conducted:

[0085] (1) Surface morphology test

[0086] The surface morphology of the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Example 1 was tested by Zeiss SUPRA-55 field reflection scanning electron microscope (SEM), and the surface morphology of the coating obtained was shown in FIG. Figure 1 shown.

[0087] (2) Hydrophobicity test

[0088] The water contact angle and rolling angle of the coating were measured by DSA100 contact angle meter. Figure 2 As shown, the contact angle test picture of the coating prepared in Comparative Example 1 is as follows Figure 3The contact angle test results of the photothermal super-hydrophobic multifunctional anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 are shown in Table 1.

[0089] (3) Photothermal performance test

[0090] The photothermal super-hydrophobic multifunctional anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 were placed in a -5°C environment at the same time, illuminated for 900 seconds under simulated sunlight conditions, and temperature tested using an infrared camera. The results are shown in Table 1.

[0091] (4) Surface ice complete melting time test

[0092] The photothermal super-hydrophobic multifunctional anti-icing coatings prepared in Examples 1-3 and the coatings prepared in Comparative Examples 1-2 were exposed to simulated sunlight at -5°C, and the surface ice melting time was recorded. The melting time of the photothermal super-hydrophobic multifunctional anti-icing coatings prepared in Examples 1-3 and the coatings prepared in Comparative Examples 1-2 at different times is shown in Chart 1.

[0093] (5) Ice adhesion strength

[0094] Deionized water was frozen in a hollow polytetrafluoroethylene mold at -10°C. After icicles formed, a 0°C deionized water film was applied to their surface. The water film interface was then laminated to a coated test panel. After freezing at -10°C for 4 hours, the shear force required to separate the icicles from the test panel was measured using a shear force tester. The ice adhesion strength was calculated based on the shear force and the cross-sectional area of the icicles. The ice adhesion strength test results for the photothermal superhydrophobic multifunctional anti-icing coatings prepared in Examples 1-3 and the coatings prepared in Comparative Examples 1-2 are shown in Table 1.

[0095] (6) Icing amount test

[0096] Under the same freezing conditions at -10°C, the ice formation amount was compared with that of a blank aluminum plate. The ice adhesion strength test results of the photothermal super-hydrophobic multifunctional anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 are shown in Table 1.

[0097] (7) Mechanical properties test

[0098] The coating adhesion was measured with reference to GB / T 9286-1998, "Scratch Test for Paint and Varnish Films." The adhesion test results for the photothermal superhydrophobic multifunctional anti-icing coatings prepared in Examples 1-3 and the coatings prepared in Comparative Examples 1-2 are shown in Table 1.

[0099] The coated side of the aluminum plate was placed on a 1000-grit sandpaper surface. A 100-g weight was placed on the test plate. The test plate was moved 20 cm at a rate of 10 cm / s for one grinding cycle. After 50 grinding cycles, the mechanical stability of the coating was evaluated by measuring the attenuation of the water contact angle, rolling angle, and ice adhesion strength of the coating.

[0100] Table 1

[0101]

[0102]

[0103] according to Figure 1 It can be seen that the surface of the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Example 1 has an obvious micro-nano secondary roughness structure, which is the key to the super-hydrophobic property of the coating. Figure 2 and Figure 3 It can be seen that the contact angle of the coating prepared in Comparative Example 1 is smaller than the contact angle of the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Example 1. Therefore, the photothermal super-hydrophobic multifunctional anti-icing coating prepared in Example 1 exhibits obvious super-hydrophobicity.

[0104] As can be seen from Table 1, the water contact angle of the photothermal super-hydrophobic multifunctional anti-icing coatings prepared by Examples 1 to 3 is greater than 158°, and the adhesion is level 1, while the water contact angle of the coatings prepared by Comparative Examples 1 to 2 is only greater than 150°. In addition, under light conditions, the temperature of the photothermal super-hydrophobic multifunctional anti-icing coatings prepared by Examples 1 to 3 is as high as 45°C or above, while the temperature of the coatings prepared by Comparative Examples 1 to 2 is only about 40°C. Moreover, the photothermal super-hydrophobic multifunctional anti-icing coatings prepared by Examples 1 to 3 can completely melt the surface ice within 660 seconds, while the coatings prepared by Comparative Examples 1 to 2 can completely melt the surface ice within 840 seconds. Therefore, the photothermal super-hydrophobic multifunctional anti-icing coatings obtained by the present invention have the characteristics of super-hydrophobicity, rapid ice melting, wear resistance, reduced ice adhesion strength, and reduced ice accumulation. Therefore, the photothermal super-hydrophobic multifunctional anti-icing coatings prepared by Examples 1 to 3 have good anti-icing function, so that the aluminum wire using the coating of the present invention has an anti-icing function.

[0105] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A photothermal super-hydrophobic multifunctional anti-icing coating, characterized in that: The method comprises a primer and a topcoat, wherein the primer and the topcoat respectively comprise the following raw materials in parts by weight: Primer: 20-25 parts of bisphenol A epoxy resin and / or fluorine-modified epoxy resin, 10-20 parts of fluorine-modified polyacrylic resin and / or polyurethane resin, 5-10 parts of curing agent, 40-55 parts of solvent; Topcoat: 2-5 parts of polytetrafluoroethylene, 1-3 parts of soluble polytetrafluoroethylene, 1-5 parts of polydimethylsiloxane, and 85-90 parts of fluorinated MOF dispersion.

2. The photothermal super-hydrophobic multifunctional anti-icing coating according to claim 1, characterized in that: The curing agent is selected from any one or more of 3-diethylaminopropylamine, 1,3-bis(4-aminophenyl)urea or ethylenediamine.

3. The photothermal super-hydrophobic multifunctional anti-icing coating according to claim 1, characterized in that: The solvent is selected from any one or more of methanol, ethanol, tetrahydrofuran, ethyl acetate or butyl acetate.

4. The photothermal super-hydrophobic multifunctional anti-icing coating according to claim 1, characterized in that: The fluorinated MOF dispersion is selected from any one or more of a fluorinated ZIF-8 ethanol dispersion, a fluorinated ZIF-67 ethanol dispersion, and a fluorinated MOF-5 ethanol dispersion.

5. The photothermal super-hydrophobic multifunctional anti-icing coating according to claim 1, characterized in that: The fluorinated MOF dispersion was prepared as follows: Perfluorooctyltriethoxysilane is added to anhydrous ethanol and mixed evenly to obtain a solution, and then a metal organic framework is added to the solution, and a fluorinated MOF dispersion is obtained after ultrasonication.

6. The photothermal super-hydrophobic multifunctional anti-icing coating according to claim 5, characterized in that: The mass ratio of perfluorooctyltriethoxysilane to metal organic framework is 1:(2-5); The content of the metal organic framework in the fluorinated MOF dispersion is 5-15%.

7. The photothermal super-hydrophobic multifunctional anti-icing coating according to claim 1, characterized in that: The photothermal super-hydrophobic multifunctional anti-icing coating has a thickness of 5 to 80 μm, a static water contact angle of 150 to 169°, and a rolling angle of 1 to 7°.

8. A method for preparing a photothermal super-hydrophobic multifunctional anti-icing coating according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: S1. Primer preparation: bisphenol A epoxy resin and / or fluorine-modified epoxy resin, fluorine-modified polyacrylic resin and / or polyurethane resin, curing agent and solvent are mixed and stirred to obtain a primer coating; S2. Topcoat preparation: polytetrafluoroethylene, soluble polytetrafluoroethylene, polydimethylsiloxane and fluorinated MOF dispersion are mixed and stirred to obtain a topcoat coating; S3, spraying primer: spraying the primer obtained in step S1 evenly on the substrate, and wait for the primer coating to dry; S3, spraying topcoat: spraying the topcoat obtained in step S2 evenly on the surface-dried primer coating obtained in step S3, and obtaining a photothermal super-hydrophobic multifunctional anti-icing coating after drying.

9. The method for preparing a photothermal super-hydrophobic multifunctional anti-icing coating according to claim 8, characterized in that: In step S3, the substrate is aluminum; In step S4, the drying conditions are: constant temperature drying at 80-110° C. with forced air for 15-40 minutes.

10. Use of the photothermal super-hydrophobic multifunctional anti-icing coating according to any one of claims 1 to 7 in aluminum conductors of power transmission lines.

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