An anti-icing coating for power transmission lines and its preparation method

Abstract

This application provides an anti-icing coating for power transmission lines and its preparation method, relating to the field of surface anti-icing and coating technology. The anti-icing coating for power transmission lines of this application comprises: Component A: 15-25 parts epoxy resin, 10-15 parts maleic anhydride-grafted polybutadiene-styrene, 0.1-0.5 parts curing agent, and 60-75 parts first solvent; Component B: 12-20 parts fluoropolymer, 5-10 parts polydimethylsiloxane, 5-10 parts maleic anhydride-grafted polybutadiene-styrene, 3-8 parts silane coupling agent-modified TiO2, 0.5-2 parts functional additives, and 65-80 parts second solvent. This anti-icing coating forms a coating with strong adhesion to the substrate, is not easily peeled off, and has excellent hydrophobic and de-icing properties, overcoming the shortcomings of current anti-icing coatings for power transmission lines.

Description

Technical Field

[0001] This application relates to the field of surface anti-icing and coating technology, and in particular to an anti-icing coating for power transmission lines and its preparation method. Background Technology

[0002] Under low-temperature conditions, especially when precipitation falls on power lines below freezing, icing occurs, known as power line icing. Icing on power lines can lead to mechanical and electrical faults such as conductor galloping, wire breakage, collapse, and insulator flashover, causing severe disruptions and significant economic losses across various sectors. The main methods for preventing and removing icing on power line conductors include thermal anti-icing, mechanical de-icing, and coating anti-icing. Thermal anti-icing utilizes additional heat sources or its own heat source to heat the conductors, making it difficult to maintain a temperature above freezing, thus preventing icing. However, this method is energy-intensive and only provides effective anti-icing in the early stages of icing. Mechanical de-icing uses external force or automatic forced anti-icing technology to remove ice from power lines, but this method is labor-intensive, inefficient, and limited by terrain. Coating anti-icing involves applying an anti-icing coating material to the surface of the power line. During the icing process, the coating material's hydrophobic properties inhibit or slow down icing, addressing the problem at its source. Coating anti-icing has become a major research direction.

[0003] Fluoropolymers, organosilicones, and fluorosilicone polymers are popular materials for anti-icing coatings. However, experiments have shown that while these hydrophobic materials possess good hydrophobic properties, their anti-icing effect is poor. Patent CN119391251A discloses a superhydrophobic anti-icing coating for power transmission lines and its preparation method. This superhydrophobic anti-icing coating material consists of 34-45 parts of a composite resin, 8-14 parts of a composite de-icing agent, 10-18 parts of deionized water, 1-3 parts of hexadecyltrimethoxysilane, and 50-58 parts of tetrahydrofuran. The composite de-icing agent is prepared from pyridine-2,6-dicarboxylic acid, sulfonium chloride, and nicotinic acid hydrazine. Although this coating exhibits excellent hydrophobicity, abrasion resistance, and anti-icing performance, its anti-icing stability and coating adhesion need improvement.

[0004] Therefore, there is currently a lack of anti-icing coatings for power transmission lines that have good adhesion, durable superhydrophobic properties, and anti-icing function. Summary of the Invention

[0005] The purpose of this application is to address the shortcomings of existing technologies by providing an anti-icing coating for power transmission lines and a preparation method thereof. The coating formed by this anti-icing coating has strong adhesion to the substrate, is not prone to peeling, and has excellent hydrophobic and de-icing properties, thus solving the defects of current anti-icing coatings for power transmission lines.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: According to one aspect of this application, an anti-icing coating for power transmission lines is provided, comprising the following raw materials in parts by weight: Component A: 15-25 parts epoxy resin, 10-15 parts maleic anhydride-grafted polybutadiene-styrene, 0.1-0.5 parts curing agent, and 60-75 parts first solvent; Component B: 12-20 parts of fluoropolymer, 5-10 parts of polydimethylsiloxane, 5-10 parts of maleic anhydride-grafted polybutadiene-styrene, 3-8 parts of silane coupling agent-modified TiO2, 0.5-2 parts of functional additives, and 65-80 parts of secondary solvent.

[0007] Preferably, the anti-icing coating for transmission lines comprises the following raw materials in parts by weight: Component A: 20 parts epoxy resin, 12 parts maleic anhydride-grafted polybutadiene-styrene, 0.2 parts curing agent, and 70 parts first solvent; Component B: 15 parts of fluoropolymer, 8 parts of polydimethylsiloxane, 7 parts of maleic anhydride-grafted polybutadiene-styrene, 25 parts of silane coupling agent-modified TiO2, 1 part of functional additives, and 75 parts of secondary solvent.

[0008] This application uses epoxy resin and maleic anhydride-grafted polybutadiene-styrene as component A to prepare the inner layer of the transmission line coating. The good compatibility between maleic anhydride-grafted polybutadiene-styrene and epoxy resin helps to form a denser and more uniform coating structure, improving low-temperature resistance while ensuring high adhesion. Component B is used to form the outer coating on the surface of the inner coating. The fluoropolymer and polydimethylsiloxane in this outer coating have good hydrophobic properties, giving the coating strong hydrophobicity and reducing the adhesion between ice and the coating. The addition of maleic anhydride-grafted polybutadiene-styrene and silane coupling agent to modify TiO2 further enhances the outer coating's excellent adhesion, hydrophobicity, de-icing properties, and weather resistance.

[0009] Furthermore, in the anti-icing coating for transmission lines, the epoxy resin is a combination of epoxy resin I and epoxy resin II, wherein the epoxy equivalent EP of epoxy resin I is 220-250 g / eq, the epoxy equivalent EP of epoxy resin II is 380-420 g / eq, and the mass ratio of epoxy resin I to epoxy resin II is (50-70):(30-50). Preferably, the epoxy equivalent EP of epoxy resin I is 230 g / eq, the epoxy equivalent EP of epoxy resin II is 400 g / eq, and the mass ratio of epoxy resin I to epoxy resin II is 60:40.

[0010] Optionally, the epoxy resin is selected from aromatic amine type epoxy resin, aminophenol type epoxy resin or aliphatic epoxy resin, as long as it meets the epoxy equivalent requirement, and there is no special limitation.

[0011] The epoxy equivalent (EP) of the epoxy resin represents the content of epoxy groups per unit mass of epoxy resin. A higher EP value indicates a lower epoxy group content, and vice versa. This application's research found that selecting epoxy resins with two different EP values ​​overcomes the shortcomings of epoxy resins with only one EP value. By rationally combining the EP values ​​and ratios of the two epoxy resins, it achieves both good adhesion to power transmission lines and excellent low-temperature resistance, making the resulting coating less prone to cracking under low-temperature conditions and extending its service life.

[0012] Further, the maleic anhydride-grafted polybutadiene-styrene is obtained by reacting maleic anhydride with polybutadiene-styrene; the molecular weight of the polybutadiene-styrene is 20,000 to 35,000, and the styrene segment content in the polybutadiene-styrene is 35% to 45%; the mass ratio of maleic anhydride to polybutadiene-styrene is (5 to 10):100, preferably, the mass ratio of maleic anhydride to polybutadiene-styrene is 8:100.

[0013] The polybutadiene-styrene described herein is well known to those skilled in the art and can be obtained directly through commercial purchase or prepared by methods known to those skilled in the art; it does not constitute a limitation of this application. Maleic anhydride-grafted polybutadiene-styrene can also be obtained directly through commercial purchase or prepared by methods known to those skilled in the art.

[0014] The weak interfacial bonding between fluoropolymers and epoxy resins, TiO2, etc., results in poor coating structure uniformity, poor adhesion, weather resistance, and other properties, making it unsuitable for long-term use in low-temperature environments. This application adds maleic anhydride-grafted polybutadiene-styrene to both component A and component B, which helps improve the interfacial bonding between the components, thereby improving coating adhesion. Furthermore, the addition of maleic anhydride-grafted polybutadiene-styrene to component A helps improve the low-temperature resistance of the inner layer, while the addition of maleic anhydride-grafted polybutadiene-styrene to component B can improve low-temperature resistance, compensating for the poor adhesion and low-temperature resistance of fluoropolymers and other materials. Maleic anhydride-grafted polybutadiene-styrene and silane coupling agent-modified TiO2 also have a certain synergistic effect, further improving low-temperature resistance and UV aging resistance, enabling the coating structure formed on the transmission line surface to maintain good performance even under prolonged low-temperature environments and UV irradiation. It is important to note that the maleic anhydride content in maleic anhydride-grafted polybutadiene-styrene needs to be controlled to keep its content within a certain range in the overall formulation, so as to avoid excessive maleic anhydride content leading to a decrease in anti-icing performance and weather resistance.

[0015] Furthermore, the fluoropolymer is any one of polyvinylidene fluoride (PVDF) or its copolymers, or polytetrafluoroethylene (PTFE).

[0016] Furthermore, the preparation method of the silane coupling agent modified TiO2 is as follows: Nano-TiO2 was dispersed in an ethanol solution, and a silane coupling agent was added and mixed evenly. The mixture was reacted at 60–80 °C for 5–8 h. After the reaction was complete, the mixture was cooled, filtered, and dried to obtain silane coupling agent modified TiO2.

[0017] Optionally, the particle size of the nano-TiO2 is 50–100 nm.

[0018] Optionally, the ethanol solution has a mass fraction of 20-75%.

[0019] Optionally, the silane coupling agent is a first silane coupling agent, which is a C12-18 alkylsilane coupling agent or a fluorinated alkylsilane coupling agent; the fluorinated alkylsilane coupling agent is preferably tridecafluorooctyltriethoxysilane or perfluorodecyltriethoxysilane; the amount of the first silane coupling agent is 20-30% of the mass of nano-TiO2.

[0020] In a further preferred embodiment, the silane coupling agent further includes a second silane coupling agent, namely a secondary aminosilane coupling agent, preferably N-butyl-3-aminopropyltrimethoxysilane; the amount of the second silane coupling agent is 5-10% of the mass of nano-TiO2.

[0021] This application adds a first silane coupling agent (C12-18 alkylsilane coupling agent or fluorinated alkylsilane coupling agent) to modify TiO2. The modified TiO2 has improved dispersibility, which improves the uniformity of the coating. TiO2 itself has excellent UV resistance, which gives the coating excellent UV aging resistance. The modified TiO2 has improved hydrophobicity, which can also form a micro-nano rough structure on the coating surface. Combined with the hydrophobicity, the coating has superhydrophobicity and reduces the adhesion between ice and the coating. Further modification with a second silane coupling agent can also play a certain synergistic role with maleic anhydride-grafted polybutadiene-styrene and epoxy resin, which helps to further improve the low temperature resistance and UV aging resistance. This allows the coating structure formed on the surface of the transmission line to maintain good performance even under long-term low temperature environment and UV irradiation.

[0022] Furthermore, the first solvent and the second solvent are independently selected from any one or more of butyl acetate, ethyl acetate, acetone, methyl ethyl ketone, ethanol, and tetrahydrofuran.

[0023] Furthermore, the functional additives include, but are not limited to, leveling agents and dispersants. The leveling agents and dispersants are well known to those skilled in the art and are not specifically limited thereto. For example, examples of dispersants include glyceryl monostearate (GMS), polyethylene glycol, and glyceryl tristearate, while examples of leveling agents include acrylic resins, urea-formaldehyde resins, and melamine-formaldehyde resins, which do not constitute a limitation of this application.

[0024] According to another aspect of this application, a method for preparing an anti-icing coating for power transmission lines is provided, comprising the following steps: (1) Mix and stir component A raw materials for 0.5 to 2 hours to obtain the inner coating; (2) Mix the raw materials of component B and stir at 60-80℃ for 2-4 hours to obtain the outer coating.

[0025] According to another aspect of this application, a method for preparing an anti-icing coating for transmission lines is provided, comprising coating the transmission line with the aforementioned anti-icing coating for transmission lines, including the following steps: first, coating an inner layer coating on the surface of the transmission line, drying it to obtain an inner coating layer, and then coating an outer layer coating, drying it to obtain an outer coating layer.

[0026] Furthermore, the thickness of the inner coating is 25–40 μm, and the thickness of the outer coating is 50–80 μm.

[0027] Compared with the prior art, this application has the following beneficial effects: The anti-icing coating for power transmission lines disclosed in this application has strong adhesion between the coating and the substrate, is not easily peeled off, and has excellent hydrophobic and de-icing properties. It also has excellent low-temperature resistance and UV aging resistance, enabling it to maintain good anti-icing performance for a long time under low-temperature environment and UV irradiation. It has good durability and has important application prospects in the field of power transmission line anti-icing. Detailed Implementation

[0028] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of this application, but do not limit this application in any way. The following content is merely an exemplary description of the scope of protection claimed in this application, and those skilled in the art can make various changes and modifications to the invention based on the disclosed content, which should also fall within the scope of protection claimed in this application.

[0029] Unless otherwise specified, all chemical reagents used in the embodiments of this application were obtained through conventional commercial means. In the specific embodiments below, maleic anhydride-grafted polybutadiene-styrene was obtained by reacting maleic anhydride with polybutadiene-styrene in a certain proportion. The specific preparation method is as follows: polybutadiene-styrene and maleic anhydride were added to sufficient xylene, reacted at 120°C, cooled after the reaction was completed, and the reaction product was poured into acetone, stirred, filtered, and dried to obtain the final product.

[0030] The present application will be further described below by way of specific embodiments.

[0031] Example 1 An anti-icing coating for power transmission lines comprises the following raw materials in parts by weight: Component A: 15 parts epoxy resin, 10 parts maleic anhydride-grafted polybutadiene-styrene, 0.1 parts curing agent, 60 parts ethyl acetate; Component B: 12 ​​parts PVDF, 5 parts polydimethylsiloxane, 5 parts maleic anhydride-grafted polybutadiene-styrene, 3 parts silane coupling agent modified TiO2, 0.5 parts tristearate, and 65 parts ethyl acetate.

[0032] In the aforementioned anti-icing coating for transmission lines, the epoxy resin includes epoxy resin I (EP of 220 g / eq) and epoxy resin II (EP of 380 g / eq) in a mass ratio of 50:50. Maleic anhydride-grafted polybutadiene-styrene is obtained by reacting maleic anhydride with polybutadiene-styrene at a mass ratio of 5:100; the molecular weight of the polybutadiene-styrene is 35,000, and the styrene segment content in the polybutadiene-styrene is 35%; Silane coupling agent modified TiO2 was prepared by the following method: nano-TiO2 (particle size 100nm) was dispersed in a sufficient amount of 70% ethanol solution, and 20% of the mass of nano-TiO2 with dodecyltrimethoxysilane was added and mixed evenly. The mixture was reacted at 60℃ for 5h. After the reaction was completed, the mixture was cooled, filtered, and dried to obtain silane coupling agent modified TiO2.

[0033] The preparation method of the above-mentioned anti-icing coating for transmission lines includes the following steps: Mix and stir component A for 0.5 hours to obtain the inner coating; mix component B and stir at 60°C for 2 hours to obtain the outer coating.

[0034] Example 2 An anti-icing coating for power transmission lines comprises the following raw materials in parts by weight: Component A: 20 parts epoxy resin, 12 parts maleic anhydride-grafted polybutadiene-styrene, 0.2 parts curing agent, 70 parts butyl acetate; Component B: 15 parts PVDF, 8 parts polydimethylsiloxane, 7 parts maleic anhydride-grafted polybutadiene-styrene, 5 parts silane coupling agent modified TiO2, 0.5 parts glyceryl monostearate, 0.5 parts acrylic resin, and 75 parts ethyl acetate.

[0035] In the aforementioned anti-icing coating for transmission lines, the epoxy resin includes epoxy resin I (EP of 230 g / eq) and epoxy resin II (EP of 400 g / eq) in a mass ratio of 60:40. Maleic anhydride-grafted polybutadiene-styrene is obtained by reacting maleic anhydride with polybutadiene-styrene at a mass ratio of 8:100; the molecular weight of the polybutadiene-styrene is 20,000, and the styrene segment content in the polybutadiene-styrene is 45%; Silane coupling agent modified TiO2 was prepared by the following method: nano-TiO2 (particle size 50nm) was dispersed in a sufficient amount of 75% ethanol solution, and 30% of the mass of nano-TiO2 with octadecyltriethoxysilane was added and mixed evenly. The mixture was reacted at 80℃ for 8h. After the reaction was completed, the mixture was cooled, filtered, and dried to obtain silane coupling agent modified TiO2.

[0036] The preparation method of the above-mentioned anti-icing coating for transmission lines includes the following steps: Mix and stir component A for 2 hours to obtain the inner coating; mix component B and stir at 60°C for 4 hours to obtain the outer coating.

[0037] Example 3 An anti-icing coating for power transmission lines comprises the following raw materials in parts by weight: Component A: 25 parts epoxy resin, 15 parts maleic anhydride-grafted polybutadiene-styrene, 0.5 parts curing agent, 75 parts butyl acetate; Component B: 20 ​​parts PTFE, 10 parts polydimethylsiloxane, 10 parts maleic anhydride-grafted polybutadiene-styrene, 8 parts silane coupling agent modified TiO2, 1 part glyceryl monostearate, 1 part acrylic resin, and 80 parts ethyl acetate.

[0038] In the aforementioned anti-icing coating for transmission lines, the epoxy resin includes epoxy resin I (EP of 250 g / eq) and epoxy resin II (EP of 420 g / eq) in a mass ratio of 60:40. Maleic anhydride-grafted polybutadiene-styrene is obtained by reacting maleic anhydride with polybutadiene-styrene at a mass ratio of 8:100; the molecular weight of the polybutadiene-styrene is 20,000, and the styrene segment content in the polybutadiene-styrene is 45%; Silane coupling agent modified TiO2 was prepared by the following method: nano-TiO2 (particle size 50 nm) was dispersed in a sufficient amount of 70% ethanol solution, and 30% of the mass of nano-TiO2 was added with octadecyltriethoxysilane and mixed evenly. The mixture was reacted at 80°C for 8 h. After the reaction was completed, the mixture was cooled, filtered, and dried to obtain silane coupling agent modified TiO2.

[0039] The preparation method of the above-mentioned anti-icing coating for transmission lines includes the following steps: Mix and stir component A for 2 hours to obtain the inner coating; mix component B and stir at 60°C for 4 hours to obtain the outer coating.

[0040] Example 4 The difference from Example 2 is that the epoxy resin includes epoxy resin I (EP of 200 g / eq) and epoxy resin II (EP of 450 g / eq) in a mass ratio of 60:40, while the total amount of epoxy resin remains unchanged.

[0041] Example 5 The difference from Example 2 is that the epoxy resin includes epoxy resin I (EP is 230 g / eq) and epoxy resin II (EP is 400 g / eq) in a mass ratio of 40:60, while the total amount of epoxy resin remains unchanged.

[0042] Example 6 The difference from Example 2 is that the epoxy resin is only epoxy resin with an EP of 230 g / eq, and its total amount remains unchanged.

[0043] Example 7 The difference from Example 2 is that the epoxy resin is only epoxy resin with an EP of 400 g / eq, and its total amount remains unchanged.

[0044] Example 8 The difference from Example 2 is that the maleic anhydride-grafted polybutadiene-styrene is in which the mass ratio of maleic anhydride to polybutadiene-styrene is 15:100.

[0045] Example 9 The difference from Example 2 is that the maleic anhydride-grafted polybutadiene-styrene has a molecular weight of 40,000 in the polybutadiene-styrene grafted onto the maleic anhydride.

[0046] Example 10 The difference from Example 2 is that the silane coupling agent modified TiO2 is prepared by the following method: nano-TiO2 is dispersed in a sufficient amount of 70% ethanol solution, 30% of the mass of nano-TiO2 in octadecyltriethoxysilane and 5% of the mass of N-butyl-3-aminopropyltrimethoxysilane are added and mixed evenly, reacted at 80°C for 8 hours, cooled after the reaction is complete, filtered and dried to obtain silane coupling agent modified TiO2.

[0047] Example 11 The difference from Example 8 is that the amount of N-butyl-3-aminopropyltrimethoxysilane added is 10% of the mass of TiO2.

[0048] Example 12 The difference from Example 8 is that the amount of N-butyl-3-aminopropyltrimethoxysilane added is 13% of the mass of TiO2.

[0049] Comparative Example 1 The difference from Example 2 is that the anti-icing coating for transmission lines comprises the following raw materials in parts by weight: Component A: 20 parts epoxy resin, 0.2 parts curing agent, 70 parts butyl acetate; Component B: 15 parts of fluoropolymer, 8 parts of polydimethylsiloxane, 5 parts of silane coupling agent modified TiO2, 0.5 parts of glyceryl monostearate, 0.5 parts of acrylic resin, and 75 parts of ethyl acetate.

[0050] Comparative Example 2 The difference from Example 2 is that the anti-icing coating for transmission lines comprises the following raw materials in parts by weight: Component A: 20 parts epoxy resin, 12 parts maleic anhydride-grafted polybutadiene-styrene, 0.2 parts curing agent, 70 parts butyl acetate; Component B: PVDF 15 parts, polydimethylsiloxane 8 parts, maleic anhydride-grafted polybutadiene-styrene 7 parts, TiO2 5 parts, glyceryl monostearate 0.5 parts, acrylic resin 0.5 parts, ethyl acetate 75 parts.

[0051] Experimental Example 1 The coatings provided in the examples and comparative examples were sprayed onto a 33cm × 20cm steel plate, specifically by first applying the inner layer of coating and then applying the outer layer of coating. After complete curing (the dry film thickness was 30μm for the inner layer and 70μm for the outer layer), the following tests were performed: (1) Contact angle: Tested using a contact angle measuring instrument; (2) Adhesion: The adhesion of the coating to the substrate surface was determined according to GB / T1720-2020; (3) Ice adhesion: The method of GB / T9286-2021 is used to test the ice adhesion on the coating surface; (4) Freezing time: The freezing time was measured at -18℃ using a low-temperature optical contact angle meter; (5) UV aging resistance: Ice adhesion was tested after 14 days of irradiation with a UV340 light source; (6) Low temperature resistance: ice adhesion after 30 freezing-heating cycles, and adhesion between coating and substrate.

[0052] The test results are shown in Tables 1 and 2 below.

[0053] Table 1. Performance test results of anti-icing coatings in Examples 1-7

[0054] Table 2. Performance test results of anti-icing coatings in Examples 8-12 and Comparative Examples 1-2

[0055] As shown in Tables 1 and 2 above, the anti-icing coating provided in this application forms a coating with good surface hydrophobicity, high adhesion and good bonding between the coating and the substrate surface, and excellent anti-icing performance. It has low ice adhesion, long freezing time, excellent low temperature resistance and UV aging resistance, good anti-icing durability, and can prevent freezing for a long time in low temperature environments.

[0056] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, this application is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope of this application should be within the protection scope of this application.

Claims

1. An anti-icing coating for power transmission lines, characterized in that, Including the following parts by weight of raw materials: Component A: 15-25 parts epoxy resin, 10-15 parts maleic anhydride-grafted polybutadiene-styrene, 0.1-0.5 parts curing agent, and 60-75 parts first solvent; Component B: 12-20 parts of fluoropolymer, 5-10 parts of polydimethylsiloxane, 5-10 parts of maleic anhydride-grafted polybutadiene-styrene, 3-8 parts of silane coupling agent-modified TiO2, 0.5-2 parts of functional additives, and 65-80 parts of secondary solvent. The epoxy resin is a combination of epoxy resin I and epoxy resin II, wherein the epoxy equivalent EP of epoxy resin I is 220-250 g / eq, and the epoxy equivalent EP of epoxy resin II is 380-420 g / eq; the mass ratio of epoxy resin I to epoxy resin II is (50-70):(30-50). The maleic anhydride-grafted polybutadiene-styrene is obtained by reacting maleic anhydride with polybutadiene-styrene; the molecular weight of the polybutadiene-styrene is 20,000 to 35,000, and the styrene segment content in the polybutadiene-styrene is 35% to 45%; the mass ratio of maleic anhydride to polybutadiene-styrene is (5 to 10):

100. The silane coupling agent in the silane coupling agent modified TiO2 includes a first silane coupling agent and a second silane coupling agent. The first silane coupling agent is a C12-18 alkylsilane coupling agent or one of tridecafluorooctyltriethoxysilane or perfluorodecyltriethoxysilane. The second silane coupling agent is N-butyl-3-aminopropyltrimethoxysilane. The preparation method of the anti-icing coating for transmission lines includes the following steps: (1) Mix and stir component A raw materials for 0.5 to 2 hours to obtain the inner coating; (2) Mix the raw materials of component B and stir at 60-80℃ for 2-4 hours to obtain the outer coating.

2. The anti-icing coating for transmission lines according to claim 1, characterized in that, The fluoropolymer is any one of polyvinylidene fluoride (PVDF) or its copolymers, or polytetrafluoroethylene (PTFE).

3. The anti-icing coating for transmission lines according to claim 1, characterized in that, The preparation method of the silane coupling agent modified TiO2 is as follows: Nano-TiO2 was dispersed in an ethanol solution, and a silane coupling agent was added and mixed evenly. The mixture was reacted at 60–80 °C for 5–8 h. After the reaction was complete, the mixture was cooled, filtered, and dried to obtain silane coupling agent modified TiO2.

4. The anti-icing coating for transmission lines according to claim 1, characterized in that, The amount of the first silane coupling agent is 20-30% of the mass of nano-TiO2.

5. The anti-icing coating for transmission lines according to claim 1, characterized in that, The amount of the second silane coupling agent is 5 to 10% of the mass of nano-TiO2.

6. The method for preparing the anti-icing coating for transmission lines according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Mix and stir component A raw materials for 0.5 to 2 hours to obtain the inner coating; (2) Mix the raw materials of component B and stir at 60-80℃ for 2-4 hours to obtain the outer coating.

7. A method for preparing an anti-coating coating for transmission lines, characterized in that, The method includes coating a transmission line with an anti-icing coating prepared by the method described in claim 6, and the steps are as follows: first, an inner coating is applied to the surface of the transmission line, and after drying, an inner coating layer is obtained; then, an outer coating is applied, and after drying, an outer coating layer is obtained.

8. The preparation method according to claim 7, characterized in that, The thickness of the inner coating is 25–40 μm, and the thickness of the outer coating is 50–80 μm.

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