Super-hydrophobic anti-icing coating for aluminum conductor and preparation method of super-hydrophobic anti-icing coating

Abstract

The invention relates to a super-hydrophobic anti-icing coating for an aluminum conductor and a preparation method of the super-hydrophobic anti-icing coating. According to the super-hydrophobic anti-icing coating, a blended polymer is used as an adhesive, and mixed particles are closely packed through particle gradation to serve as a reinforcing phase; wherein the blended polymer is formed by mixing epoxy resin and polydimethylsiloxane; the mixed particles are obtained by mixing one or more of montmorillonite, tourmaline powder and sepiolite powder with different micron particle sizes and then mixing with the super-hydrophobic nanoparticles; the super-hydrophobic nano-particles are obtained by performing super-hydrophobic modification on hydrophilic nano-particles. Compared with the prior art, the coating has the characteristics of super-hydrophobicity, wear resistance, reduction of ice adhesion strength and reduction of icing amount, can effectively solve the icing problem of an aluminum conductor of a power transmission line of a power system, can be applied to power equipment such as the aluminum conductor of the power transmission line and the like, and realizes excellent long-acting wear-resistant performance of the super-hydrophobic anti-icing coating.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a superhydrophobic anti-icing coating for aluminum wires and a preparation method thereof. Background Art

[0002] To avoid or mitigate the hazards caused by ice coating on transmission lines, in addition to improving the anti-icing design standards of power grid lines, anti-icing or de-icing technologies should also be actively considered. Anti-icing methods for transmission lines include thermal anti-icing / de-icing methods, mechanical de-icing methods, natural passive anti-icing / de-icing methods, and other de-icing methods. However, thermal anti-icing / de-icing methods have high energy consumption, the safety and working efficiency of mechanical de-icing methods are low, natural passive de-icing methods are overly dependent on weather conditions, and the de-icing effect is accidental. Other anti-icing / de-icing methods remain in the stage of theoretical verification and simulation. Therefore, these methods cannot fundamentally inhibit and eliminate the occurrence of ice coating disasters on transmission lines.

[0003] In recent years, inspired by the lotus leaf in nature, scholars have prepared a series of superhydrophobic anti-icing coatings using bionic technology. Due to its unique micro-nano composite rough structure and low surface energy substances, the water medium is separated from the surface of the transmission line by an air film, which has great potential in the field of anti-icing of transmission lines. However, insufficient durability severely limits the application of superhydrophobic coatings in the field of anti-icing of transmission lines. It is extremely difficult to simultaneously achieve anti-icing and long-lasting superhydrophobic coatings through structural design. On the one hand, introducing a rough structure on the superhydrophobic coating can obtain excellent hydrophobicity, but it will also lead to local water vapor penetration and a decrease in the mechanical strength of the coating. On the other hand, reducing the surface energy of the coating is beneficial to increasing the energy barrier for water medium adsorption, penetration, and ice crystal formation, but it will introduce the problem of weak coating adhesion.

[0004] In the past few decades, scholars have made a large number of attempts to solve these challenges, but they have always been difficult to meet the requirements of practical applications. A commonly used method is that researchers try to design a long-lasting superhydrophobic anti-icing coating by selecting materials with high elastic modulus, high elasticity, self-healing ability, or self-similar structure. However, the long-term effectiveness of the coating is still difficult to meet the requirements of practical applications. Another method is to construct a hard armor with a fine microstructure on the surface, including interconnected frameworks, pores, and columnar array structures, which can improve the overall mechanical durability. However, this method requires a complex manufacturing process and is difficult to resist harsh environments such as local sharp wear and water flow impact.

[0005] So far, the design and large-scale preparation of long-lasting, wear-resistant superhydrophobic anti-icing coatings are still one of the bottleneck problems in the field of anti-icing of transmission lines.

[0006] Chinese Patent CN115873479A discloses a wear-resistant superhydrophobic coating and a preparation method thereof. The coating uses an organic-inorganic hybrid resin as an adhesive, and the mixed particles achieve the densest packing through particle gradation as the reinforcing phase. The organic-inorganic hybrid resin is composed of cement, water, a curing agent, and a hydrophobic modified epoxy resin. The mixed particles are formed by mixing one or several of quartz sand, aluminum oxide, and polytetrafluoroethylene particles with different micron particle sizes, and then mixing with nanoparticles. The adhesive of this patent only contains conventional epoxy adhesives, which are not used for anti-icing applications and do not have good anti-icing performance themselves. Moreover, the reinforcing phase is not explicitly subjected to superhydrophobic modification treatment, resulting in limited anti-icing effects.

[0007] Chinese Patent CN115595023A discloses an anti-icing coating for transmission lines, which includes an insulating and anti-corrosion inner coating and a photothermal-electrothermal-superhydrophobic outer coating that are successively attached to the surface of the transmission line substrate from the inside to the outside. The photothermal-electrothermal-superhydrophobic outer coating is composed of a hydrophobic modified C / SiO2 filler, nano piezoelectric particles, PVDF or its copolymer, and carbon nanotubes. The thickness of the insulating and anti-corrosion inner coating is 50μm - 80μm; the thickness of the photothermal-electrothermal-superhydrophobic outer coating is 200μm - 500μm. The carbon nanotubes are multi-walled carbon nanotubes with a diameter of 10nm - 30nm and a length of 10μm - 20μm; the particle size of the nano piezoelectric particles is 100nm - 300nm. The preparation process of this patent is cumbersome, the coating structure is complex, and expensive materials such as carbon nanotubes and nano piezoelectric particles are used, increasing the production cost. Moreover, the anti-icing effect depends on photothermal or electrothermal assistance, resulting in limited environmental adaptability. Summary of the Invention

[0008] The purpose of the present invention is to provide a superhydrophobic anti-icing coating for aluminum conductors and a preparation method thereof to overcome the problem of poor mechanical durability of superhydrophobic anti-icing coatings in the prior art. Through gradation optimization, the particles inside the coating are closely arranged in the present invention. By relying on hard and inexpensive montmorillonite, tourmaline powder, sepiolite powder, etc., a strong structure is constructed through dense arrangement to protect the superhydrophobic nanoparticles, thereby improving mechanical durability. The superhydrophobic anti-icing coating prepared by the present invention has the characteristics of superhydrophobicity, wear resistance, reduced ice adhesion strength, and reduced ice formation amount, and can effectively solve the icing problem of aluminum conductors in transmission lines of the power system. It can be applied to power equipment such as aluminum conductors in transmission lines to achieve the excellent performance of long-term wear resistance of the superhydrophobic anti-icing coating.

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] A superhydrophobic anti-icing coating for aluminum conductors, the superhydrophobic anti-icing coating uses a blend polymer as an adhesive, and the mixed particles achieve the densest packing through particle gradation as the reinforcing phase;

[0011] Among them, the blend polymer is formed by mixing epoxy resin and polydimethylsiloxane;

[0012] The mixed particles are obtained by mixing one or more of montmorillonite, tourmaline powder, and sepiolite powder with different micron particle sizes, and then mixing with superhydrophobic nanoparticles;

[0013] The superhydrophobic nanoparticles are obtained by superhydrophobic modification of hydrophilic nanoparticles.

[0014] Furthermore, the epoxy resin is selected from any one or more of bisphenol A epoxy resin, E-51 epoxy resin, or fluorinated epoxy resin.

[0015] Furthermore, the preparation method of the superhydrophobic nanoparticles is as follows:

[0016] Disperse the hydrophilic nanoparticles in a water-alcohol solvent containing a hydrophobic agent, and perform stirring, separation, and drying in sequence to obtain superhydrophobic nanoparticles.

[0017] Furthermore, the hydrophilic nanoparticles are selected from nano-silica, nano-titanium dioxide, or nano-aluminum oxide, and the particle size of the hydrophilic nanoparticles is 7-20 nm.

[0018] Furthermore, the hydrophobic agent is selected from any one or more of n-butyltriethoxysilane, n-octyltriethoxysilane, perfluorooctyltriethoxysilane, perfluorodecylethoxysilane, dodecyltriethoxysilane, or octadecyltriethoxysilane.

[0019] In addition, the present invention also provides a preparation method of a superhydrophobic anti-icing coating for aluminum wires, and the specific steps are as follows:

[0020] S1. Mix epoxy resin and polydimethylsiloxane evenly to obtain an adhesive;

[0021] S2. Mix the mixed particles with different sizes, superhydrophobic nanoparticles, the adhesive prepared in step S1, and a dispersant to obtain a coating;

[0022] S3. Coat the coating prepared in step S2 on the aluminum material, and dry to obtain the superhydrophobic anti-icing coating.

[0023] Furthermore, in step S1, ultrasonic and mechanical stirring are used to mix epoxy resin and polydimethylsiloxane evenly.

[0024] Furthermore, in step S1, the mass ratio of the epoxy resin to the polydimethylsiloxane is 1:0.1-0.4.

[0025] Further, in step S2, ultrasonic and mechanical stirring are used to fully mix mixed particles of different sizes, superhydrophobic nanoparticles, the binder prepared in step S1, and the dispersant.

[0026] Further, in step S2, the dispersant is selected from any one or more of ethanol, ethyl acetate, or butyl acetate.

[0027] Further, in step S2, the dispersant accounts for 40 - 80 wt.% of the total mass of the coating;

[0028] The binder prepared in step S1 accounts for 20 - 35 wt.% of the total mass of the coating excluding the dispersant;

[0029] The content of the mixed particles accounts for 30 - 45 wt.% of the total mass of the coating excluding the dispersant;

[0030] The content of the superhydrophobic nanoparticles accounts for 20 - 35 wt.% of the total mass of the coating excluding the dispersant.

[0031] Further, in step S3, the drying conditions are constant temperature blowing drying at 110 - 120 °C for 10 - 25 min.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) The present invention relies on hard and inexpensive montmorillonite, tourmaline powder, sepiolite powder, etc., to build a strong micron structure through dense arrangement, and relies on superhydrophobic nanoparticles to achieve superhydrophobic performance, which can realize the protection of the nano - structure by the strong micron particles; in addition, the hydrophobic blend polymer composed of epoxy resin and polydimethylsiloxane acts as a binder in the inner layer, tightly connecting the superhydrophobic coating with the aluminum wire substrate, enhancing the strength and mechanical properties of the coating.

[0034] (2) Compared with conventional anti - icing coatings, the present invention uses common materials and optimized process steps, significantly reducing the preparation complexity and making it easier for industrial application. Therefore, the preparation method of the long - lasting wear - resistant superhydrophobic anti - icing coating of the present invention is simple, low - cost, and convenient for large - scale preparation.

[0035] (3) The long - lasting wear - resistant superhydrophobic anti - icing coating of the present invention has the characteristics of superhydrophobicity, wear resistance, reducing ice adhesion strength, and reducing ice accretion, and can effectively solve the icing problem of aluminum wires in the transmission lines of the power system, and can be applied to aluminum wires of transmission lines.

[0036] (4) Compared with the prior art, the present invention has made improvements in the selection of adhesives, the optimization of reinforcing phases, and the modification of nanoparticles, making the coating more advantageous in terms of superhydrophobicity and anti-icing performance; the present invention simplifies the coating structure, reduces costs, enhances environmental adaptability, improves anti-icing performance through particle size grading optimization, and is more practical and economical. Description of the Drawings

[0037] Figure 1 SEM image of the surface of the superhydrophobic anti-icing coating prepared in Example 1 of the present invention;

[0038] Figure 2 SEM image of the surface of the superhydrophobic anti-icing coating prepared in Comparative Example 1 of the present invention;

[0039] Figure 3 Contact angle test picture of the superhydrophobic anti-icing coating prepared in Example 1 of the present invention;

[0040] Figure 4 Contact angle test picture of the superhydrophobic anti-icing coating prepared in Comparative Example 1 of the present invention. Detailed Description of the Invention

[0041] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and gives detailed implementation methods and specific operation processes, 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] In the following examples and comparative examples, for the convenience of testing and observation, aluminum wires are not used, and the coating is prepared by spraying the coating on an aluminum plate.

[0044] Some embodiments of the present invention will be described in detail below with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] Example 1:

[0046] This example provides a superhydrophobic anti-icing coating for aluminum wires, and the superhydrophobic anti-icing coating uses a blend polymer as an adhesive, and the mixed particles achieve the densest packing through particle size grading as the reinforcing phase;

[0047] Among them, the blend polymer is composed of E-51 epoxy resin and polydimethylsiloxane;

[0048] The mixed particles are composed of montmorillonite powder with mesh numbers of 325 mesh and 400 mesh, and then mixed with superhydrophobic nanoparticles, and the superhydrophobic nanoparticles are obtained by superhydrophobic modification of hydrophilic nanoparticles.

[0049] In this embodiment, the hydrophilic nanoparticles are nano-silica particles.

[0050] The water repellent used for the superhydrophobic modification is octadecyltriethoxysilane.

[0051] In addition, this embodiment also provides a method for preparing a superhydrophobic anti-icing coating for aluminum wires, and the specific steps are as follows:

[0052] S1. Mix 1 g of E-51 epoxy resin and 0.3 g of polydimethylsiloxane, and use ultrasonic for 20 min and mechanical stirring at a room temperature of 600 rpm for 2 h to make the E-51 epoxy resin and polydimethylsiloxane evenly mixed to obtain an adhesive.

[0053] S2. Disperse 3.6 g of hydrophilic nano-silica particles with a particle size of 12 nm in 160 ml of a water-alcohol solvent (the volume ratio of deionized water to ethanol is 1:1) containing 0.48 ml of octadecyltriethoxysilane, stir at room temperature for 2 h, centrifuge at 10000 rpm, and dry at 60 °C for 24 h to obtain superhydrophobic silica nanoparticles.

[0054] S3. Mix 0.5 g of montmorillonite powder microparticles with a mesh number of 325 meshes, 0.5 g of montmorillonite powder microparticles with a mesh number of 400 meshes, 1 g of superhydrophobic silica nanoparticles, 1 g of the adhesive, and 7 g of the dispersant butyl acetate, and use ultrasonic for 20 min and mechanical stirring at a room temperature of 600 rpm for 2 h to make them fully mixed to obtain a coating.

[0055] S4. Spray the coating obtained in step S3 on an aluminum plate, and perform a drying treatment at 110 °C for 20 min to obtain the superhydrophobic anti-icing coating.

[0056] Example 2:

[0057] This embodiment provides a superhydrophobic anti-icing coating for aluminum wires. The superhydrophobic anti-icing coating uses a blend polymer as an adhesive, and the mixed particles achieve the densest packing through particle size grading as the reinforcing phase.

[0058] Among them, the blend polymer is composed of E-51 epoxy resin and polydimethylsiloxane mixed.

[0059] The mixed particles are composed of tourmaline powder with mesh numbers of 325 meshes and 400 meshes, and then mixed with superhydrophobic nanoparticles. The superhydrophobic nanoparticles are obtained by superhydrophobic modification of hydrophilic nanoparticles.

[0060] In this embodiment, the hydrophilic nanoparticles are nano-titanium dioxide particles.

[0061] The water repellent used for the superhydrophobic modification is dodecyltriethoxysilane.

[0062] In addition, this embodiment also provides a preparation method of a superhydrophobic anti-icing coating for aluminum wires, and the specific steps are as follows:

[0063] S1. Mix 1 g of E-51 epoxy resin and 0.3 g of polydimethylsiloxane, and use ultrasonic for 30 min and mechanical stirring at room temperature of 600 rpm for 2 h to make the E-51 epoxy resin and polydimethylsiloxane evenly mixed to obtain an adhesive;

[0064] S2. Disperse 3.6 g of hydrophilic nano-titanium dioxide particles with a particle size of 14 nm in 160 ml of a water-alcohol solvent (the volume ratio of deionized water to ethanol is 1:1) containing 0.48 ml of dodecyltriethoxysilane, stir at room temperature for 2 h, centrifuge at 10000 rpm, and dry at 60 °C for 24 h to obtain superhydrophobic titanium dioxide nanoparticles;

[0065] S3. Mix 0.5 g of tourmaline powder micron particles with a mesh number of 325 meshes, 0.5 g of tourmaline powder micron particles with a mesh number of 400 meshes, 1 g of superhydrophobic titanium dioxide nanoparticles, 1 g of the adhesive, and 7 g of the dispersant butyl acetate, and use ultrasonic for 30 min and mechanical stirring at room temperature of 700 rpm for 3 h to make them fully mixed to obtain a coating;

[0066] S4. Spray the coating obtained in step S3 on an aluminum plate, and perform a drying treatment at 120 °C for 15 min to obtain the superhydrophobic anti-icing coating.

[0067] Example 3:

[0068] This embodiment provides a superhydrophobic anti-icing coating for aluminum wires. The superhydrophobic anti-icing coating uses a blend polymer as an adhesive, and the mixed particles achieve the densest packing through particle size grading as the reinforcing phase;

[0069] Among them, the blend polymer is composed of a mixture of E-51 epoxy resin and polydimethylsiloxane;

[0070] The mixed particles are composed of sepiolite powder with mesh numbers of 325 meshes and 400 meshes, and are mixed with superhydrophobic nanoparticles. The superhydrophobic nanoparticles are obtained by superhydrophobic modification of hydrophilic nanoparticles.

[0071] In this embodiment, the hydrophilic nanoparticles are nano-aluminum oxide particles,

[0072] The water repellent used for the superhydrophobic modification is octyltriethoxysilane.

[0073] In addition, this embodiment also provides a preparation method of a superhydrophobic anti-icing coating for aluminum wires, and the specific steps are as follows:

[0074] S1. Mix 1 g of E-51 epoxy resin and 0.3 g of polydimethylsiloxane, and use ultrasound for 40 min and mechanical stirring at room temperature of 800 rpm for 2 h to make the E-51 epoxy resin and polydimethylsiloxane mix evenly to obtain an adhesive;

[0075] S2. Disperse 3.6 g of hydrophilic nano-aluminum oxide particles with a particle size of 7 nm in 160 ml of a water-alcohol solvent (the volume ratio of deionized water to ethanol is 1:1) containing 0.48 ml of n-octyltriethoxysilane, stir at room temperature for 2 h, centrifuge at 10000 rpm, and dry at 60 °C for 24 h to obtain superhydrophobic alumina nanoparticles;

[0076] S3. Mix 0.5 g of 325-mesh sepiolite powder micron particles, 0.5 g of 400-mesh sepiolite powder micron particles, 1 g of superhydrophobic alumina nanoparticles, 1 g of the adhesive, and 7 g of the dispersant ethanol, and use ultrasound for 20 min and mechanical stirring at room temperature of 600 rpm for 2 h to make them mix fully to obtain a coating;

[0077] S4. Spray the coating obtained in step S3 on an aluminum plate, and dry it at 120 °C for 15 min to obtain the superhydrophobic anti-icing coating.

[0078] Comparative Example 1

[0079] This comparative example provides a coating for an aluminum wire, and the coating uses a blend polymer as an adhesive and superhydrophobic nanoparticles as a reinforcing phase;

[0080] Among them, the blend polymer is composed of E-51 epoxy resin and polydimethylsiloxane;

[0081] The superhydrophobic nanoparticles are obtained by superhydrophobic modification of hydrophilic nanoparticles. The hydrophilic nanoparticles are 12-nm nano-silica particles, and the hydrophobic agent used for the superhydrophobic modification is octadecyltriethoxysilane.

[0082] In addition, this comparative example also provides a preparation method for a coating for an aluminum wire, and the specific steps are as follows:

[0083] S1. Mix 1 g of E-51 epoxy resin and 0.3 g of polydimethylsiloxane, and use ultrasound for 20 min and mechanical stirring at room temperature of 600 rpm for 2 h to make the E-51 epoxy resin and polydimethylsiloxane mix evenly to obtain an adhesive;

[0084] S2. Disperse 3.6 g of hydrophilic nano-silica particles with a particle size of 12 nm in 160 ml of a water-alcohol solvent (the volume ratio of deionized water to ethanol is 1:1) containing 0.48 ml of octadecyltriethoxysilane, stir at room temperature for 2 h, centrifuge at 10000 rpm, and dry at 60 °C for 24 h to obtain superhydrophobic silica nanoparticles;

[0085] S3. Mix 1 g of superhydrophobic silica nanoparticles, 1 g of binder, and 7 g of dispersant butyl acetate, and use ultrasonic treatment for 20 min and mechanical stirring at room temperature of 600 rpm for 2 h to fully mix them to obtain a coating;

[0086] S4. Spray the coating obtained in step S3 on an aluminum plate and dry it at 110 °C for 20 min to obtain the coating.

[0087] Comparative Example 2

[0088] This comparative example provides a coating for an aluminum wire, and the coating uses the most dense packing of mixed particles through particle size grading as the reinforcing phase;

[0089] Among them, the mixed particles are composed of montmorillonite powder with mesh numbers of 325 mesh and 400 mesh, and then mixed with superhydrophobic nanoparticles. The superhydrophobic nanoparticles are obtained by superhydrophobic modification of hydrophilic nanoparticles. The hydrophilic nanoparticles are nano-silica particles, and the hydrophobic agent used for the superhydrophobic modification is octadecyltriethoxysilane.

[0090] In addition, this comparative example also provides a preparation method for a coating for an aluminum wire, and the specific steps are as follows:

[0091] S1. Disperse 3.6 g of hydrophilic nano-silica particles with a particle size of 12 nm in 160 ml of a water-alcohol solvent (the volume ratio of deionized water to ethanol is 1:1) containing 0.48 ml of octadecyltriethoxysilane, stir at room temperature for 2 h, centrifuge at 10000 rpm, and dry at 60 °C for 24 h to obtain superhydrophobic silica nanoparticles;

[0092] S2. Mix 0.5 g of 325-mesh montmorillonite powder micron particles, 0.5 g of 400-mesh montmorillonite powder micron particles, 1 g of superhydrophobic silica nanoparticles, and 7 g of dispersant butyl acetate, and use ultrasonic treatment for 20 min and mechanical stirring at room temperature of 600 rpm for 2 h to fully mix them to obtain a coating;

[0093] S3. Spray the coating obtained in step S2 on an aluminum plate and dry it at 110 °C for 20 min to obtain the superhydrophobic anti-icing coating.

[0094] In order to illustrate the effects of the long-lasting wear-resistant superhydrophobic anti-icing coating for aluminum wires provided by this application, the following tests were specifically carried out:

[0095] (1) Surface morphology test

[0096] The surface morphology of the superhydrophobic anti-icing coating prepared in Example 1 and the coating prepared in Comparative Example 1 was tested by a Zeiss SUPRA 55 field emission scanning electron microscope (SEM), and the obtained surface morphology diagrams of the coatings are as shown in Figure 1 and Figure 2 shown.

[0097] (2) Hydrophobicity test

[0098] The water contact angle and rolling angle of the coating were measured by a DSA100 contact angle measuring instrument. The contact angle test pictures of the superhydrophobic anti-icing coating prepared in Example 1 are as shown in Figure 3 shown, and the contact angle test pictures of the coating prepared in Comparative Example 1 are as shown in Figure 4 shown; the contact angle test results of the superhydrophobic anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 are shown in Table 1.

[0099] (3) Ice adhesion strength

[0100] In a 10°C environment, deionized water in a hollow polytetrafluoroethylene mold was frozen. After an ice column was formed, a deionized water film at 0°C was dipped on its surface. The water film interface was compounded with the coating test plate. After freezing at 10°C for 4 h, a shear force test device was used to measure the shear force for the separation of the ice column and the test plate, and the ice adhesion strength was calculated based on the shear force and the cross-sectional area of the ice column. The ice adhesion strength test results of the superhydrophobic anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 are shown in Table 1.

[0101] (4) Ice accumulation amount test

[0102] Under the same icing conditions at 10°C, the ice accumulation amount was compared with that of a blank aluminum plate. The ice accumulation amount test results of the superhydrophobic anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 are shown in Table 1.

[0103] (5) Mechanical property test

[0104] Referring to GB / T 9286 1998 "Cross-cut test for paints and varnishes - Films", the adhesion of the coating was measured. The adhesion test results of the superhydrophobic anti-icing coatings prepared in Examples 1 to 3 and the coatings prepared in Comparative Examples 1 to 2 are shown in Table 1.

[0105] Place the coated side of the aluminum plate on the surface of 1000-mesh sandpaper, place a 100 g weight on the test plate, and move the test plate at a rate of 10 cm / s for 20 cm as one grinding cycle. After 50 grinding cycles, evaluate the mechanical stability of the coating by measuring the attenuation of the water contact angle, rolling angle, and ice adhesion strength of the coating.

[0106] Table 1 Performance test results of the superhydrophobic anti-icing coatings prepared in Examples 1-3 and the coatings prepared in Comparative Examples 1-2

[0107]

[0108] Comparison Figure 1 and Figure 2 It can be seen that the surface of the superhydrophobic anti-icing coating prepared in Example 1 has an obvious micro-nano secondary rough structure, which is the key to the superhydrophobic performance of the coating.

[0109] Comparison Figure 3 and Figure 4 It can be seen that the contact angle of the superhydrophobic anti-icing coating prepared in Example 1 is significantly greater than that of the coating prepared in Comparative Example 1, and the superhydrophobic anti-icing coating prepared in Example 1 exhibits obvious superhydrophobicity.

[0110] As can be seen from Table 1, the contact angles of the superhydrophobic anti-icing coatings prepared in Examples 1-3 are greater than 165°, and the adhesion is Grade 1, while the water contact angles of the coatings prepared in Comparative Examples 1-2 are only greater than 150°, and the calculated surface energy value is as low as 12.6 mN / m (derived from Young's equation), proving that the bionic micro-nano structure successfully constructs a stable Cassie-Baxter wetting state. Although the contact angle of Comparative Example 2 reaches 158.7°, the dispersion coefficient of its surface roughness distribution reaches 0.38 (AFM test data not shown), resulting in a risk of local failure of the wetting state, while the dispersion coefficient of the roughness distribution of Example 1 is controlled within 0.12.

[0111] The superhydrophobic anti-icing coating prepared in Example 1 has a 64% reduction in the amount of ice formation, which is significantly greater than the reduction in the amount of ice formation of the coatings prepared in Comparative Examples 1-2. Therefore, the superhydrophobic anti-icing coating prepared in Example 1 significantly delays the ice formation rate.

[0112] After 50 times of sandpaper abrasion (CS-10 wheel, 1 kPa pressure), the contact angle of the superhydrophobic anti-icing coating prepared in Example 1 only decreases by 5.1%, which is significantly better than the 22% attenuation of the coating prepared in Comparative Example 2.

[0113] Therefore, the superhydrophobic anti-icing coatings prepared in Examples 1 to 3 have the characteristics of superhydrophobicity, long-term wear resistance, reduced ice adhesion strength, and reduced ice formation amount, enabling the aluminum wires coated with the coating of the present invention to have an anti-icing function.

[0114] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A super-hydrophobic anti-icing coating for aluminum wire, characterized in that: The super hydrophobic anti-icing coating uses a blended polymer as a binder, and the mixed particles are densely packed through particle grading to form a reinforcing phase; Wherein, the blended polymer is a mixture of epoxy resin and polydimethylsiloxane; The mixed particles are obtained by mixing one or more of montmorillonite, tourmaline powder and sea foam powder with different micron particle sizes, and then mixing with super hydrophobic nanoparticles; The super-hydrophobic nanoparticles are obtained by subjecting hydrophilic nanoparticles to super-hydrophobic modification.

2. The super-hydrophobic anti-icing coating for aluminum wire according to claim 1, characterized in that: The epoxy resin is selected from any one or more of bisphenol A epoxy resin, E-51 epoxy resin or fluorinated epoxy resin.

3. The super-hydrophobic anti-icing coating for aluminum wire according to claim 1, characterized in that: The preparation method of the super-hydrophobic nanoparticles is as follows: The hydrophilic nanoparticles are dispersed in a water-alcohol solvent containing a hydrophobic agent, and stirred, separated and dried in sequence to obtain super-hydrophobic nanoparticles.

4. The super-hydrophobic anti-icing coating for aluminum wire according to claim 3, characterized in that: The hydrophilic nanoparticles are selected from nano-silicon dioxide, nano-titanium dioxide or nano-aluminum oxide, and the particle size of the hydrophilic nanoparticles is 7-20 nm.

5. The super-hydrophobic anti-icing coating for aluminum wire according to claim 3, characterized in that: The hydrophobic agent is selected from any one or more of n-butyltriethoxysilane, n-octyltriethoxysilane, perfluorooctyltriethoxysilane, perfluorodecylethoxysilane, dodecyltriethoxysilane or octadecyltriethoxysilane.

6. A method for preparing a super-hydrophobic anti-icing coating for an aluminum wire as claimed in any one of claims 1 to 5, characterized in that: The specific steps are as follows: S1, mixing epoxy resin and polydimethylsiloxane to obtain an adhesive; S2, mixing the mixed particles of different sizes, the super-hydrophobic nanoparticles, the adhesive prepared in step S1, and the dispersant to obtain a coating; S3, coating the coating prepared in step S2 on the aluminum material, and obtaining the super-hydrophobic anti-icing coating after drying.

7. The method for preparing a super-hydrophobic anti-icing coating for aluminum wire according to claim 6, characterized in that: In step S1, the mass ratio of the epoxy resin to polydimethylsiloxane is 1:0.1-0.

4.

8. The method for preparing a super-hydrophobic anti-icing coating for an aluminum conductor according to claim 6, characterized in that: In step S2, the dispersant is selected from any one or more of ethanol, ethyl acetate or butyl acetate.

9. The method for preparing a super-hydrophobic anti-icing coating for an aluminum conductor according to claim 6, characterized in that: In step S2, the dispersant accounts for 40 to 80 wt.% of the total mass of the coating; The binder prepared in step S1 accounts for 20-35 wt.% of the total mass of the coating excluding the dispersant; The content of the mixed particles accounts for 30-45 wt.% of the total mass of the coating excluding the dispersant; The content of the super-hydrophobic nanoparticles accounts for 20 to 35 wt.% of the total mass of the coating excluding the dispersant.

10. The method for preparing a super-hydrophobic anti-icing coating for aluminum wire according to claim 6, characterized in that: In step S3, the drying condition is constant temperature forced air drying at 110-120° C. for 10-25 min.

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