Silica-silicone resin composite super-hydrophobic coating contact line and processing technology

Abstract

This invention relates to the field of contact wire technology, and discloses a silica-silicone resin composite superhydrophobic coating contact wire and its processing technology. The contact wire includes a contact wire body and a composite superhydrophobic coating covering it. The cross-section of the contact wire body is a circle with two symmetrically distributed arc segments along the center line, narrowing towards the center line to form two overlapping fan-shaped sections, one wide and one narrow, denoted as the wide fan-shaped section and the narrow fan-shaped section. The composite superhydrophobic coating is disposed in the narrow fan-shaped section and the wide fan-shaped section outside the corresponding range of the central angle θ symmetrically distributed along the center line, where θ is 90°±3°. The composite superhydrophobic coating includes an adhesive layer and a functional layer. The adhesive layer is made of fluorocarbon resin, and the functional layer is made of superhydrophobic modified SiO2 dispersion. This invention aims to solve the problems of the tensile strength of the contact wire being affected, the service life being reduced, and the process being complex and costly in the existing contact wire antifreeze and corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of contact wire technology, specifically to a silica-silicone resin composite superhydrophobic coating contact wire and its processing technology. Background Technology

[0002] Currently, the contact wire system of electrified railways, as the core carrier of train power supply, is directly related to railway transportation safety due to its reliable operation. In coastal salt spray environments, the contact wire exposes corrosion problems; in low-temperature and high-humidity environments, contact wire icing has also become a serious challenge. The icing layer not only increases the vertical load on the conductor but also deteriorates the pantograph's current collection quality. The ice layer's insulation causes a sharp increase in contact resistance, leading to arcing and localized overheating. When the ice layer thickness exceeds 3mm, the risk of current collection failure increases significantly. Short-circuit de-icing involves localized temperature rises, which can lead to annealing softening and a decrease in tensile strength. Traditional methods relying on manual ice breaking or hot-sliding de-icing are inefficient and require interrupting train operations, affecting track efficiency. These methods also pose safety risks and labor costs. As high-speed rail extends into colder regions, developing efficient anti-icing and de-icing technologies has become a key issue for ensuring all-weather operation.

[0003] Patent number CN215042228U describes an ice-melting contact wire, comprising a contact wire body with a slot at the top. A heat conductor is pre-installed within the slot, and a controller is electrically connected to the outside of the heat conductor, enabling automatic control of heating or stopping the heat conductor. During low-temperature freezing, the controller controls the heat conductor to melt the ice; when the temperature is high, the power to the heat conductor is cut off, stopping its operation. The heat conductor is wrapped with an insulating sheath. The insulating sheath and the inner layer of the slot together form the ice-melting cable, which is placed within the pre-machined slot on the contact wire body to ensure the contact wire meets the requirements for ice melting.

[0004] The existing technology using a heat conductor structure to heat and melt ice contact wires has significant drawbacks: First, slotting the contact wire body compromises its integrity, reducing its tensile strength and sacrificing system robustness. Second, the insulating sheath covering the heat conductor undergoes insulation aging, which accelerates under long-term corona discharge conditions, reducing the overall lifespan of the contact wire. Third, active heating for ice melting carries the risk of thermal runaway; the metal resistance wire lacks self-limiting temperature characteristics, and poor local contact can lead to temperatures exceeding 300°C within the slot, causing softening of the contact wire and increasing the risk of fatigue fracture. Simultaneously, thermal cycling stress accelerates crack propagation at the slot, shortening the lifespan. Therefore, this solution does not improve the corrosion resistance of the contact wire; in fact, the slotted structure increases the surface area, weakening corrosion resistance to some extent. Summary of the Invention

[0005] To address existing problems, this invention aims to provide a silica-silicone resin composite superhydrophobic coating contact wire and its processing technology. This addresses issues such as reduced tensile strength, shortened service life, and increased costs associated with existing contact wire antifreeze and corrosion resistance processes. By employing silica-silicone resin composite superhydrophobic coating technology, the antifreeze and corrosion resistance of the contact wire is improved, while ensuring its strength and service life, thereby reducing the maintenance costs of the contact network system.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] This invention provides a silica-silicone resin composite superhydrophobic coating contact wire, comprising a contact wire body and a composite superhydrophobic coating covering it; the cross-section of the contact wire body is a circle with two arc segments symmetrically distributed along the center line, narrowing towards the center line to form two overlapping fan-shaped sections, one wide and one narrow, denoted as the wide fan-shaped section and the narrow fan-shaped section; the composite superhydrophobic coating is disposed in the narrow fan-shaped section and the wide fan-shaped section outside the range corresponding to the central angle θ symmetrically distributed along the center line, where θ is 90°±3°; the composite superhydrophobic coating includes an adhesive layer and a functional layer, wherein the adhesive layer is made of fluorocarbon resin and the functional layer is made of superhydrophobic modified SiO2 dispersion.

[0008] As a further improvement of the present invention, the superhydrophobic modified SiO2 dispersion comprises 9-14 wt% SiO2, 12 wt% methyl silicone resin, 2 wt% HDTMS and xylene.

[0009] The present invention also provides a spraying device for a silica-silicone resin composite superhydrophobic coating contact wire, comprising a forming tube and a spraying tube. The two ends of the spraying tube are respectively connected to the forming tube along the length direction. The inner diameter of both the forming tube and the spraying tube is larger than the outer diameter of the contact wire body. The tube walls of both the forming tube and the spraying tube have axially penetrating openings, and both ends of the tube walls of the forming tube and the spraying tube are provided with barrier baffles that can extend to the surface of the contact wire body. The inner wall of the spraying tube is provided with a plurality of nozzles circumferentially arranged.

[0010] As a further improvement of the present invention, the nozzles are angled together toward the contact line body, and the nozzles together form a uniform coverage of the surface of the contact line body, and the baffle can limit the spraying range of the nozzles.

[0011] As a further improvement of the present invention, it also includes a forming tube support, which is connected to the forming tube; a groove is provided on the forming tube, and a viewing mirror is provided on the groove.

[0012] This invention also provides a processing technology for a silica-silicone resin composite superhydrophobic coating contact wire, characterized by comprising the following steps: The superhydrophobic coating slurry is mixed and stirred, and then degassed under vacuum. The fluorocarbon resin and isocyanate are formulated into a main agent solution, and butyl acetate and propylene glycol methacrylate are formulated into a diluent. The main agent solution and the diluent are mixed and stirred, and then degassed under vacuum. The contact wire is electrolytically degreased in an electrolyte solution; then the contact wire is passed through an activation solution pool at a steady speed. While retaining the control area, fluorocarbon resin is sprayed as an adhesive layer outside the contact line by multi-nozzle spraying or ring spraying, and then infrared segmented curing is performed. While preserving the control area, a superhydrophobic coating slurry is sprayed outside the contact line as a superhydrophobic coating through multi-nozzle spraying or ring spraying, and then infrared segmented curing is performed.

[0013] As a further improvement of the present invention, the infrared segmented curing includes the following steps: Infrared curing was performed at 80℃ for 90 seconds, at 150℃ for 120 seconds, and at 220℃ for 60 seconds.

[0014] As a further improvement of the present invention, the electrolytic degreasing includes the following steps: The contact wire was immersed in an electrolyte solution of Na3PO4 with a concentration of 50 g / L.

[0015] As a further improvement of the present invention, the activation liquid in the activation pool is H2O2 and H2SO4.

[0016] The present invention has the following beneficial effects: The unique cross-sectional shape design of the contact wire body, combined with a composite superhydrophobic coating at specific locations, optimizes the performance of the contact wire. The composite superhydrophobic coating consists of an adhesive layer and a functional layer. The fluorocarbon resin adhesive layer enhances the adhesion between the coating and the contact wire body, while the superhydrophobic modified SiO2 dispersion functional layer imparts superhydrophobic properties to the contact wire, reducing dirt adhesion, lowering frictional resistance, and improving the stability and reliability of the contact wire during operation, thus extending its service life. The composite superhydrophobic coating is positioned in the narrow sector and the wide sector portion outside the corresponding range of the central angle θ, symmetrically distributed along the centerline, exposing the bottom surface of the contact wire conductor and ensuring that the contact wire body contacts the pantograph to supply power to the vehicle.

[0017] Preferably, the superhydrophobic modified SiO2 dispersion is formulated with specific proportions, and the components work synergistically. SiO2 provides the basis for the rough surface structure, methyl silicone resin enhances the bonding with SiO2 and the overall performance of the coating, HDTMS (hexadecyltrimethoxysilane) hydrophobically modifies SiO2, and xylene is used as a solvent to ensure uniform dispersion of the components, together ensuring that the functional layer has good superhydrophobic properties and stable performance.

[0018] Preferably, the design of the forming tube and the spraying tube facilitates the smooth passage of the contact wire and the spraying operation. The inner diameter is larger than the outer diameter of the contact wire body, providing space for the movement of the contact wire and spraying; the baffle prevents the spraying material from overflowing, ensuring accurate spraying area, reducing material waste and environmental pollution; the multiple nozzles circumferentially on the inner wall of the spraying tube enable uniform spraying, resulting in a uniform thickness of the composite superhydrophobic coating and improving coating quality.

[0019] Preferably, the nozzle angle is aligned with the contact wire body to further optimize the spraying effect, allowing the spraying material to be sprayed more accurately onto the contact wire surface, improving material utilization, ensuring uniform coating coverage, enhancing the bonding strength between the coating and the contact wire body, and improving coating performance.

[0020] Preferably, the forming tube support provides stable support for the forming tube, ensuring the stability of the entire spraying device during operation and facilitating smooth spraying operations. The forming tube is equipped with a groove and a sight glass, allowing operators to easily observe the contact line inside the forming tube, such as its correct position and surface condition, enabling timely detection and resolution of problems and ensuring spraying quality.

[0021] The processing steps are complete and reasonable. The initial treatment of the slurry and solution (mixing, stirring, vacuum degassing, etc.) ensures stable material performance and eliminates defects such as bubbles; electrolytic degreasing removes oil and other impurities from the contact wire surface, improving surface cleanliness; the activation bath activates the contact wire surface, enhancing the adhesion between the coating and the substrate; multi-nozzle spraying or ring spraying combined with controlled area retention enables precise spraying, meeting the coating requirements of different parts; infrared segmented curing allows for gradual curing at different temperatures according to the characteristics of different coating materials, ensuring optimal coating performance and ultimately obtaining a high-quality composite superhydrophobic coating contact wire.

[0022] By employing a segmented infrared curing process with specific temperatures and times, the coating undergoes different physical and chemical changes at different stages. The low-temperature stage provides initial curing, allowing the coating to take initial shape; the medium-temperature stage further cures the coating, enhancing its strength and adhesion; and the high-temperature stage completes the final curing, ensuring stable coating performance and achieving the expected performance requirements such as superhydrophobicity, while avoiding problems such as cracking and deformation caused by one-time high-temperature curing.

[0023] Immersion electrolytic degreasing in a Na3PO4 electrolyte solution of a specific concentration can effectively remove impurities such as oil and rust from the surface of the contact wire, providing a clean and highly active surface for subsequent activation treatment and coating spraying, improving the bonding strength between the coating and the contact wire body, and ensuring coating quality and service life.

[0024] The activating solution composed of H2O2 and H2SO4 can effectively activate the surface of the contact wire. H2O2 has oxidizing properties, which can remove tiny impurities on the surface and create a certain degree of roughness; H2SO4 can further clean the surface and adjust its chemical properties, enhancing surface activity, thereby improving the adhesion between the coating and the contact wire body and ensuring that the coating is not easily peeled off during use. Attached Figure Description

[0025] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a coating structure diagram of a silica-silicone resin composite superhydrophobic coating contact line in Example 1; Figure 2 This is a schematic diagram of the barrier baffle structure of the spraying device for a silica-silicone resin composite superhydrophobic coating contact line in Example 1. Figure 3 This is a schematic diagram of the forming tube and spraying tube structure of the spraying device for a silica-silicone resin composite superhydrophobic coating contact line in Example 1. Figure 4 This is a schematic diagram of the multi-nozzle spraying device structure for the processing technology of a silica-silicone resin composite superhydrophobic coating contact line in Example 1. Figure 5 This is a schematic diagram of the assembly line operation of a silica-silicone resin composite superhydrophobic coating contact line and its processing technology in Example 1. Figure 6 This is a schematic diagram of the bracket for a spraying device for a silica-silicone resin composite superhydrophobic coating contact line in Example 2. Figure 7 This is a schematic diagram of the viewing mirror of the spraying device for a silica-silicone resin composite superhydrophobic coating contact line in Example 3; Among them, 1. Contact wire body; 2. Composite superhydrophobic coating; 3. Wide fan shape; 4. Narrow fan shape; 5. Forming tube; 6. Spraying tube; 7. Nozzle; 8. Barrier baffle; 9. Forming tube support; 10. Sight glass. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Example 1 like Figure 1 As shown, a silica-silicone resin composite superhydrophobic coating contact wire includes a contact wire body 1 and a composite superhydrophobic coating 2 covering it. The cross-section of the contact wire body 1 is a circle with two arc segments symmetrically distributed along the center line, narrowing towards the center line to form two overlapping fan-shaped sections, one wide and one narrow, denoted as wide fan-shaped section 3 and narrow fan-shaped section 4. The composite superhydrophobic coating 2 is disposed in the narrow fan-shaped section 4 and the wide fan-shaped section 3 outside the range corresponding to the central angle θ symmetrically distributed along the center line, where the central angle θ is 90°±3. The composite superhydrophobic coating 2 includes an adhesive layer and a functional layer. The adhesive layer is made of fluorocarbon resin, and the functional layer is made of superhydrophobic modified SiO2 dispersion.

[0030] The central angle θ is 90°±3°. If the angle is too small, it will affect the pantograph's ability to fully contact the bottom of the contact wire for power transmission. If the angle is too large, it will affect the coating's antifreeze and corrosion resistance.

[0031] The unique cross-sectional shape design of the contact wire body 1, combined with the composite superhydrophobic coating 2 at specific locations, optimizes the performance of the contact wire. The composite superhydrophobic coating 2 consists of an adhesive layer and a functional layer. The fluorocarbon resin adhesive layer enhances the adhesion between the coating and the contact wire body 1, while the superhydrophobic modified SiO2 dispersion functional layer imparts superhydrophobic properties to the contact wire, reducing dirt adhesion, lowering frictional resistance, and improving the stability and reliability of the contact wire body 1 during operation, thus extending its service life.

[0032] The superhydrophobic modified SiO2 dispersion comprises 10 wt% SiO2, 12 wt% methyl silicone resin, 2 wt% HDTMS, and xylene. The specific proportions of the superhydrophobic modified SiO2 dispersion components work synergistically. SiO2 provides the basic rough surface structure, methyl silicone resin enhances the bonding with SiO2 and the overall performance of the coating, and HDTMS (hexadecyltrimethoxysilane) hydrophobically modifies SiO2. The trimethoxysilyl groups in the HDTMS molecule can undergo a hydrolytic condensation reaction with the hydroxyl groups on the SiO2 surface, introducing hexadecyl chains into the SiO2 surface. The hexadecyl chains are hydrophobic, reducing the surface energy of the SiO2 surface, making it easier for water droplets to roll off the contact wire body 1, thereby further improving the superhydrophobic properties of the coating. Xylene, acting as a solvent, ensures that all components are uniformly dispersed in the dispersion, collectively guaranteeing the functional layer's excellent superhydrophobic properties and stable performance. Its good solubility and volatility allow it to evaporate rapidly during spraying, enabling the components in the dispersion to deposit uniformly on the surface of the contact line body 1, forming a uniform coating. Simultaneously, the moderate evaporation rate of xylene ensures that the coating will not develop defects such as cracks due to excessively rapid solvent evaporation during the drying process.

[0033] The silica-silicone resin composite superhydrophobic coating technology demonstrates significant comprehensive benefits in outdoor applications of contact lines. Through the dual effects of Si-O-Cu chemical bonding and nano-SiO2 mechanical interlocking, this coating forms a long-lasting anti-corrosion barrier, reducing the corrosion rate of the contact line and increasing its salt spray resistance time. It also delays icing at low temperatures and reduces ice adhesion strength. The surface self-cleaning effect reduces dust deposition and lowers rainwater runoff friction resistance. Furthermore, its electrical safety performance meets the requirements of high-voltage applications.

[0034] The composite superhydrophobic coating 2 consists of an adhesive layer and a functional layer, a layered structure with significant advantages. The adhesive layer uses fluorocarbon resin, which possesses excellent chemical stability and weather resistance, maintaining stable performance under various harsh environments. The fluorine atoms in its molecular structure have extremely strong electronegativity, resulting in strong intermolecular forces and a tightly packed molecular chain structure. This structure allows the fluorocarbon resin to form good chemical bonds with the surface of the contact wire body 1, enhancing the adhesion between the coating and the contact wire body 1. The functional layer uses a superhydrophobic modified SiO2 dispersion. SiO2 has a high specific surface area and abundant surface hydroxyl groups, providing a basis for constructing a rough surface structure. Through superhydrophobic modification, the SiO2 surface acquires low surface energy, thus endowing the contact wire body 1 with superhydrophobic properties. This superhydrophobic property enables the contact angle between the surface of the contact wire body 1 and the water droplet to be greater than 150°, so that the water droplet forms an approximately spherical shape on the surface of the contact wire body 1 and rolls off easily. This reduces dirt adhesion, lowers frictional resistance, and improves the stability and reliability of the contact wire body 1 during operation, thus extending its service life.

[0035] like Figure 2-3 As shown, this embodiment also provides a spraying device for a silica-silicone resin composite superhydrophobic coating contact wire, including a forming tube 5 and a spraying tube 6. The two ends of the spraying tube 6 are connected to the forming tube 5 along its length. The inner diameters of both the forming tube 5 and the spraying tube 6 are larger than the outer diameter of the contact wire body 1. Both the forming tube 5 and the spraying tube 6 have axially penetrating openings in their walls, and both ends of the forming tube 5 and the spraying tube 6 are provided with baffles 8 that can extend to the surface of the contact wire body 1. Multiple nozzles 7 are circumferentially arranged on the inner wall of the spraying tube 6. The contact wire body 1, by its own weight (ensuring the contact wire is straightened), is evenly pressed onto the baffles 8 on both sides of the bottom of the device. The baffles 8 are in close contact with the bottom of the contact wire body 1, effectively blocking the coating material sprayed from the device tube and preventing the coating material from contacting the bottom surface of the contact wire in areas where spraying is not required. Optionally, a soft rubber sleeve can be added to the top of the barrier baffle 8 where it contacts the contact wire body 1 to reduce rigid contact and improve sealing, preventing the sprayed material from overflowing.

[0036] The design of the forming tube 5 and the spraying tube 6 facilitates the smooth passage of the contact wire and the spraying operation. The inner diameter is larger than the outer diameter of the contact wire body 1, providing space for the movement of the contact wire body 1 and the spraying process; for example... Figure 4As shown, the baffle 8 prevents the sprayed material from overflowing, ensuring accurate spraying and reducing material waste and environmental pollution. Multiple circumferential nozzles 7 on the inner wall of the spray tube 6 enable uniform spraying, resulting in a uniform thickness of the composite superhydrophobic coating 2 and improving coating quality. Both the forming tube 5 and the spray tube 6 have axially penetrating openings in their walls. This opening design serves multiple purposes. Firstly, it facilitates the installation and removal of the contact wire. Before spraying begins, the contact wire can be easily inserted into the forming tube 5 and the spray tube 6 through the openings; after spraying, the contact wire can be easily removed for inspection and subsequent processing. Secondly, the opening design also facilitates observation and maintenance of the internal conditions, allowing for timely detection and resolution of potential problems, such as nozzle 7 blockage or uneven coating.

[0037] The nozzles 7 are angled together and oriented towards the contact wire body 1, forming a uniform coverage of the surface of the contact wire body 1. The baffle 8 limits the spraying range of the nozzles 7. The angled alignment of the nozzles 7 towards the contact wire body 1 further optimizes the spraying effect, allowing the spraying material to be sprayed more accurately onto the surface of the contact wire body 1, improving material utilization, ensuring uniform coating coverage, enhancing the bonding strength between the coating and the contact wire body 1, and improving coating performance.

[0038] This invention also provides a processing technology for a silica-silicone resin composite superhydrophobic coating contact wire, characterized by comprising the following steps: The superhydrophobic coating slurry is mixed and stirred, and then degassed under vacuum. The fluorocarbon resin and isocyanate are formulated into a main agent solution, and butyl acetate and propylene glycol methacrylate are formulated into a diluent. The main agent solution and the diluent are mixed and stirred, and then degassed under vacuum. like Figure 5 As shown, S100: Electrolytic degreasing of the contact wire body 1 is performed in an electrolyte solution, and the contact wire body 1 is immersed in an electrolyte solution with a concentration of 50 g / L Na3PO4; then the contact wire body 1 is passed through an activation liquid pool at a stable speed, the activation liquid being H2O2 and H2SO4. S200: While retaining the control area, fluorocarbon resin is sprayed as an adhesive layer on the outside of the contact wire body 1 by multi-nozzle spraying or ring spraying. S300: Perform infrared segmented curing, infrared curing at 80℃ for 90s, infrared curing at 150℃ for 120s, and infrared curing at 220℃ for 60s. S400: While retaining the control area, a superhydrophobic coating slurry is sprayed onto the outside of the contact wire body 1 by multi-nozzle spraying or ring spraying as a superhydrophobic coating. S500: Performs segmented infrared curing, with infrared curing at 80℃ for 90s, at 150℃ for 120s, and at 220℃ for 60s.

[0039] Specifically, the mass fraction of fluorocarbon resin to aliphatic isocyanate is 100:(10-12). The fluorocarbon resin provides a weather-resistant / adhesive substrate, while the isocyanate acts as a crosslinking curing agent.

[0040] Specifically, fluorocarbon resin is sprayed as the adhesive layer, and superhydrophobic coating slurry is used as the superhydrophobic coating. The wet film thickness of both layers is 18-22μm, and the dry film thickness is 5±1μm. The thickness is measured using an electromagnetic film thickness gauge or eddy current after curing.

[0041] Preliminary treatment of the slurry and solution (mixing, vacuuming, degassing, etc.) ensures stable material performance and eliminates defects such as bubbles; electrolytic degreasing removes oil and other impurities from the surface of the contact wire body 1, improving surface cleanliness; activation of the contact wire body 1 surface through an activation bath enhances the adhesion between the coating and the body; multi-nozzle spraying or ring spraying combined with the retention of control areas enables precise spraying to meet the coating requirements of different parts; infrared segmented curing allows for gradual curing at different temperatures according to the characteristics of different coating materials, ensuring optimal coating performance and ultimately obtaining a high-quality composite superhydrophobic coating contact wire.

[0042] The time for each step can be adjusted according to the traveling speed of the contact wire body 1. Through infrared segmented curing steps at specific temperatures and times, the coating can undergo different physical and chemical changes at different stages. The low-temperature stage is for initial curing, allowing the coating to take initial shape; the medium-temperature stage is for further curing, enhancing the coating strength and adhesion; the high-temperature stage completes the final curing, ensuring stable coating performance and achieving the expected performance requirements such as superhydrophobicity, while avoiding problems such as coating cracking and deformation caused by one-time high-temperature curing.

[0043] Immersion electrolysis and degreasing with a specific concentration of Na3PO4 electrolyte solution can effectively remove oil, rust and other impurities from the surface of the contact wire body 1, providing a clean and highly active surface for subsequent activation treatment and coating spraying, improving the bonding strength between the coating and the contact wire body 1, and ensuring the coating quality and service life.

[0044] The activating solution composed of H2O2 and H2SO4 can effectively activate the surface of the contact wire body 1. H2O2 has oxidizing properties, which can remove tiny impurities on the surface and create a certain degree of surface roughness; H2SO4 can further clean the surface and adjust the surface chemical properties, enhance surface activity, thereby improving the adhesion between the coating and the contact wire body 1, and ensuring that the coating is not easily peeled off during use.

[0045] Economic analysis shows that although the cost per meter of this embodiment is higher than that of the traditional process, its expected lifespan is longer, and it achieves a maintenance-free design, reducing labor and energy costs, thereby lowering the overall lifecycle cost. The production process emits no cyanide, meeting the requirements of green manufacturing.

[0046] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The superhydrophobic modified SiO2 dispersion contains 14 wt% SiO2; 2) It also includes a forming tube support 9, which is connected to the forming tube 5; the forming tube 5 is provided with a groove, and a viewing mirror 10 is provided on the groove.

[0047] During the operation of the spraying device, the contact wire body 1 moves at high speed within the forming tube 5 and the spraying tube 6, while the spraying material is also sprayed at a certain pressure. These factors may cause the forming tube 5 to vibrate or shift. Figure 6 As shown, the forming tube support 9, by fixing the position of the forming tube 5, ensures the stability of the entire spraying device during operation, which is conducive to the smooth progress of the spraying operation. The forming tube support 9 can be made of sturdy metal materials, such as stainless steel, to ensure that it has sufficient strength and stability. At the same time, the design of the forming tube support 9 should also take into account ease of installation and disassembly, facilitating the maintenance and upkeep of the spraying device.

[0048] like Figure 7 As shown, a groove is provided on the forming tube 5, and a viewing mirror 10 is installed on the groove. This design provides great convenience for operators. During the spraying operation, the operator can observe the condition of the contact wire body 1 inside the forming tube 5 through the viewing mirror 10, such as whether the position of the contact wire body 1 is correct and whether the surface condition is good. If problems such as misalignment of the contact wire body 1 or impurities on the surface are found, the operator can stop the spraying operation in time for adjustment and treatment, avoiding a decline in coating quality or damage to the contact wire due to undetected problems. The viewing mirror 10 can be made of transparent materials such as plexiglass, which has good light transmission and corrosion resistance, allowing clear observation of the inside of the tube. At the same time, the placement of the viewing mirror 10 should be reasonable, convenient for the operator to observe, and should not affect the normal operation of the spraying device.

[0049] Example 3 The difference between this embodiment and Embodiment 1 is that: The electrolytic degreasing process described in the fabrication technology of silica-silicone resin composite superhydrophobic coating contact wires is as follows: The electrolyte was a mixture of 50 g / L Na3PO4, 30 g / L Na2CO3 and 2 g / L nonionic surfactant. The temperature was set at 60±5℃, the current density was 5 A / dm2 at the cathode (first 40s) and 3 A / dm2 at the anode (last 20-50s), and the voltage was 6-8VDC. After electrolytic degreasing, a continuous water film method was used. The wire was considered to have maintained an intact water film for 30s after exiting the water, and the degreasing was considered qualified if no visible oil stains were found when wiping a 100mm path with a white cloth.

[0050] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A spraying device for a silica-silicone resin composite superhydrophobic coating contact line, characterized in that, The device includes a forming tube and a spraying tube. The spraying tube is connected to the forming tube at both ends along its length. The inner diameter of both the forming tube and the spraying tube is larger than the outer diameter of the contact wire body. Both the forming tube and the spraying tube have axially penetrating openings in their walls, and both ends of their walls are equipped with baffles that extend to the surface of the contact wire body. Multiple nozzles are circumferentially arranged on the inner wall of the spraying tube. The contact wire body has a circular cross-section with two symmetrically distributed arcs along the centerline, narrowing towards the centerline to form two overlapping fan-shaped sections, one wide and one narrow, denoted as the wide fan and the narrow fan. The spraying device is used to spray the narrow fan and the wide fan-shaped section outside the range corresponding to the central angle θ symmetrically distributed along the centerline, where θ is 90°±3°. The nozzles are angularly aligned towards the contact wire body, collectively forming a uniform coverage of the contact wire body surface. The baffles limit the spraying range of the nozzles. Both the forming tube and the spraying tube have a fan-shaped cross-section with a central angle of (360°-θ).

2. The spraying device for a silica-silicone resin composite superhydrophobic coating contact line according to claim 1, characterized in that, It also includes a forming tube support, which is connected to the forming tube; the forming tube is provided with a groove, and a viewing mirror is provided on the groove.

3. A processing technology for a silica-silicone resin composite superhydrophobic coating contact wire, characterized in that, Includes the following steps: The superhydrophobic coating slurry is mixed and stirred, and then degassed under vacuum. The fluorocarbon resin and isocyanate are formulated into a main agent solution, and butyl acetate and propylene glycol methacrylate are formulated into a diluent. The main agent solution and the diluent are mixed and stirred, and then degassed under vacuum. The contact wire is electrolytically degreased in an electrolyte solution; then the contact wire is passed through an activation solution pool at a steady speed. While retaining the control area, a spraying device for a silica-silicone resin composite superhydrophobic coating contact line as described in any one of claims 1-2 is used to spray fluorocarbon resin as an adhesive layer on the outside of the contact line through multiple nozzles and perform infrared segmented curing. While retaining the control area, a spraying device for a silica-silicone resin composite superhydrophobic coating contact line as described in any one of claims 1-2 is used to spray a superhydrophobic coating slurry onto the outside of the contact line as a superhydrophobic coating through multiple nozzles, and then perform infrared segmented curing.

4. The processing technology of the silica-silicone resin composite superhydrophobic coating contact wire according to claim 3, characterized in that, The infrared segmented curing includes the following steps: Infrared curing was performed at 80℃ for 90 seconds, at 150℃ for 120 seconds, and at 220℃ for 60 seconds.

5. The processing technology for a silica-silicone resin composite superhydrophobic coating contact wire according to claim 3, characterized in that, The electrolytic degreasing includes the following steps: The contact wire was immersed in an electrolyte solution of Na3PO4 with a concentration of 50 g / L.

6. The processing technology of the silica-silicone resin composite superhydrophobic coating contact wire according to claim 3, characterized in that, The activation solution in the activation solution tank is H2O2 and H2SO4.

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