High-speed rail overhead line system insulating protective sleeve with anti-icing performance and preparation method thereof

Abstract

The invention discloses a high-speed rail overhead line system insulating protective sleeve with anti-icing performance and a preparation method thereof, and belongs to the technical field of insulating composite materials, the insulating protective sleeve at least comprises two layers, namely an outer layer and an inner layer, the outer layer is an outer protective layer, and the inner layer is an inner rubber layer; the outer protective layer is one of a super-hydrophobic coating and a polytetrafluoroethylene film; the inner rubber layer comprises the following components in percentage by weight: 24% of a reinforcing filler, 10% of a structure control agent, 3% of a high-temperature-resistant synergist, 2% of toner, 5% of silicone oil, 3% of a vulcanizing agent and the balance of raw silicone rubber; the surface of the insulating protective sleeve is one of a wave-shaped surface and a smooth surface. The icing phenomenon of the high-speed rail overhead line system in extreme weather such as freezing rain is effectively prevented, the outage and shutdown probability of the high-speed rail is reduced, and manpower and material resources such as manual knockout after icing are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of insulating composite materials, and in particular relates to an insulating protective cover for a high-speed railway contact network with anti-icing performance and a preparation method thereof. Background Art

[0002] Under the influence of freezing rain, ice covering the high-speed rail contact network can easily lead to the suspension of high-speed rail operations. Traditional manual de-icing is time-consuming and labor-intensive. Heating and ice-melting technology can effectively relieve the pressure, but it is still a passive de-icing method.

[0003] Therefore, it is necessary to provide an insulating protective cover for a high-speed railway contact network with anti-icing performance to solve the current situation in which high-speed railways are suspended due to icing of the contact network in freezing rain weather. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to provide a high-speed railway contact network insulating protective cover with anti-icing performance and a preparation method thereof.

[0005] To achieve the above object, the present invention provides the following technical solution: an insulating protective cover for a high-speed railway contact network with anti-icing performance, the insulating protective cover having at least two layers, namely an outer layer and an inner layer, the outer layer being an outer protective layer, and the inner layer being an inner rubber layer; The outer protective layer is one of a super hydrophobic coating and a polytetrafluoroethylene film; The inner rubber layer includes the following components in percentage by weight: reinforcing filler 24%, structure control agent 10%, high temperature resistant enhancer 3%, color powder 2%, silicone oil 5%, vulcanizing agent 3%, and the balance is silicone rubber raw rubber; The surface of the insulating protective cover is one of a wavy surface and a smooth surface.

[0006] Preferably, the silicone rubber raw rubber is methyl vinyl silicone rubber, the reinforcing filler is synthetic silica, the structure control agent is dimethyl hydroxy silicone oil, and the vulcanizing agent is a mixture of hydrogen-containing silicone oil and Pt catalyst in a ratio of 1:2.

[0007] Preferably, the outer protective layer is a super hydrophobic coating, and the surface of the insulating protective cover is a wavy surface.

[0008] Preferably, the outer protective layer is a polytetrafluoroethylene film, and the surface of the insulating protective sleeve is a wavy surface.

[0009] A method for preparing a high-speed railway contact network insulating protective cover with anti-icing performance comprises the following steps: Step 1: Wrap the silicone rubber on the front roller of the two-roll mill, set the roller speed ratio to 1.3:1, and let condensed water flow through the rollers at the same time, keeping the temperature below 50°C. The roller spacing is 1mm at the beginning, and the low-temperature thin-pass time is 13 minutes; when mixing and eating powder, transfer the package to the rear roller, and then add reinforcing filler synthetic silica, structure control agent, high-temperature resistant synergist, color powder and silicone oil in succession. After 5 thin passes, unload the material and park for 8 hours; Step 2: After the storage, re-refine, add vulcanizing agent, set the temperature to 180 ℃, pass through 5 times, and continue to store for 1 day; Step 3: Re-refining the vulcanized silicone rubber in step 2 and placing it in a preheated mold with a wavy surface for molding, setting the pressure to 6 MPa and the temperature to 170 °C, and keeping the molding for 4 minutes; Step 4: After the pressing is completed, it is immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization. 2MPa high-pressure steam is passed into the pipeline for 2h, and condensed water is passed at the tail; Step 5: After the secondary vulcanization is completed, let it stand at room temperature and then spray a super-hydrophobic coating to obtain an insulating protective cover.

[0010] A method for preparing a high-speed railway contact network insulating protective cover with anti-icing performance comprises the following steps: Step 1: Wrap the silicone rubber on the front roller of the two-roll mill, set the roller speed ratio to 1.3:1, and let condensed water flow through the rollers at the same time, keeping the temperature below 50°C. The roller spacing is 1mm at the beginning, and the low-temperature thin-pass time is 13 minutes; when mixing and eating powder, transfer the package to the rear roller, and then add reinforcing filler synthetic silica, structure control agent, high-temperature resistant synergist, color powder and silicone oil in succession. After 5 thin passes, unload the material and park for 8 hours; Step 2: After the storage, re-refine, add vulcanizing agent, set the temperature to 180 ℃, pass through 5 times, and continue to store for 1 day; Step 3: After refining the vulcanized silicone rubber obtained in step 2, put it into a preheated mold with a wave surface covered with polytetrafluoroethylene for molding, set the pressure to 6 MPa, the temperature to 170 ° C, and keep the molding for 4 minutes; Step 4: After the pressing is completed, it is immediately sent to the sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization. 2 MPa high-pressure steam is passed into the pipeline for 2 hours, and condensed water is passed at the tail; Step 5: After the secondary vulcanization is completed, let it stand at room temperature and then spray a super-hydrophobic coating to obtain an insulating protective cover.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The insulating protective cover prepared by the present invention innovatively adopts a similar brim structure, which is simple in method and low in cost, and can effectively protect the high-speed rail contact network from icing in extreme weather such as freezing rain, reduce the probability of high-speed rail power outages and suspension of operation, and reduce human and material resources such as manual knocking out after icing.

[0012] 2. The insulating protective cover prepared by the present invention has excellent hydrophobicity and anti-icing performance, and its extremely low surface energy gives the protective cover excellent hydrophobicity and anti-icing performance.

[0013] 3. The insulating protective cover prepared by the present invention has excellent reliability. After the silicone rubber is vulcanized by hydrogen-containing silicone oil + Pt catalyst, no matter it faces external high temperature or heat generated by the contact network power supply, the vulcanized silicone rubber under the hydrosilylation vulcanization system has more excellent mechanical and electrical properties. The protective cover prepared by the present invention has higher reliability when used on the contact network.

[0014] 4. The process of preparing the insulating protective cover of the present invention has tight adhesion between each layer. The lamination technology is used during molding. Under the conditions of pressure of 6 MPa and temperature of 170°C, the Teflon film can be effectively and tightly attached to the rubber protective cover. Then, during secondary vulcanization with high-pressure steam, the cross-linking degree of the colloid is increased, thereby increasing the adhesion between the colloid and the Teflon film.

[0015] 5. The present invention makes the insulating protective cover into a hat-brim shape that completely fits the contact network. In addition to effectively preventing the contact network from being covered with ice, it also has good shock resistance and wind resistance.

[0016] 6. The present invention makes the surface of the insulating protective cover into a wavy curved surface. Referring to the icing process of the eaves, the wavy surface will prolong the process of forming ice ridges. First, the ice will fill the valley first, and then form ice ridges with uniform spacing, length, and thickness at the edge of the valley bottom, which will not easily cause the carbon sliding plate to break when the high-speed rail is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional view of the insulating protective cover of the present invention; Figure 2 It is a schematic diagram of ice formation on the surfaces of different shapes of the insulating protective cover of the present invention.

[0018] In the figure: 1 outer protective layer, 2 inner rubber layer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] See also Figure 1, an insulating protective cover for a high-speed railway contact network with anti-icing performance, the insulating protective cover has at least two layers, which are divided into an outer layer and an inner layer, the outer layer is an outer protective layer 1, and the inner layer is an inner rubber layer 2; the insulating protective cover as a whole is a brim structure, and through a certain inclination angle, the residence time of water droplets is reduced, thereby reducing the possibility of ice formation on the protective cover to a certain extent at the physical level; The outer protective layer 1 is one of a super hydrophobic coating and a polytetrafluoroethylene film; The surface of the insulating protective cover is covered with a polytetrafluoroethylene film to reduce the surface energy of the insulating protective cover and the bonding force between the protective cover and ice, thereby achieving the purpose of preventing icing; The super hydrophobic coating is prepared by spraying the super hydrophobic coating using the invention patent method with the authorization announcement number: CN114106676B; It is worth noting that the thickness of the superhydrophobic coating and the polytetrafluoroethylene film are both controlled at 0.1 mm.

[0021] The inner rubber layer 2 includes the following components in percentage by weight: 24% reinforcing filler, 10% structure control agent, 3% high temperature resistant enhancer, 2% color powder, 5% silicone oil, 3% vulcanizing agent, and the balance is silicone rubber raw rubber; The surface of the insulating protective cover is one of a wavy surface and a smooth surface.

[0022] See also Figure 2 The surface of the insulating protective cover adopts a grooved design, which is designed into a wavy shape after optimization. If ice forms on the surface of the protective cover, the grooves will be filled first, and then evenly spaced and slender ice ridges will form in the grooves. The impact force of the carbon skateboard sliding is enough to break them without damaging the carbon skateboard.

[0023] The silicone rubber raw rubber is methyl vinyl silicone rubber, the reinforcing filler is synthetic silica, the structure control agent is dimethyl hydroxy silicone oil, and the vulcanizing agent is hydrogen-containing silicone oil and Pt catalyst in a ratio of 1:2.

[0024] The methyl vinyl silicone rubber uses 101 specification methyl vinyl silicone rubber, the synthetic silica uses HL-200, the dimethyl hydroxy silicone oil uses PMX200, the hydrogenated silicone oil uses 67148-57-2 202 specification hydrogenated silicone oil, the high temperature resistant enhancer uses SH-826, the Pt catalyst uses HY78-HY-Pt30, and the toner is Preston silicone rubber coloring toner.

[0025] Synthetic silica: fills the voids and pores in the silicone rubber matrix, increases the density of the material, and directly improves the hardness and tensile strength of the silicone rubber; a physical or chemical adsorption interface can be formed between the silica and the silicone rubber matrix, enhancing the mechanical strength and wear resistance of the silicone rubber; effectively prevents the aging process of the silicone rubber material while enhancing the heat resistance of the silicone rubber.

[0026] Dimethylhydroxysilicone oil: controls the structuring effect. The rubber compound with the addition of dimethylhydroxysilicone oil can maintain softness and plasticity for a longer period of time, extending the storage period of silicone rubber compounds; increases the transparency of silicone rubber products, making the products more transparent and beautiful; reduces the re-mixing time during the mixing of silicone rubber, reducing production costs; reduces the viscosity torque of the rubber compound, making the rubber compound smoother and easier to operate during processing.

[0027] High temperature resistant enhancer SH-826: It can effectively prevent the oxidative cross-linking of silicone rubber side chains and the cyclization and depolymerization of the main chain, thereby improving the thermal oxidation stability of silicone rubber side groups; this enables the temperature resistance of silicone rubber to be increased to around 290-300°C, and can withstand temperatures of 350°C for a short time, overcoming the defect of traditional silicone rubber with a narrow temperature resistance range (-60°C-260°C); and giving silicone rubber excellent electrical insulation properties.

[0028] Toner: coloring.

[0029] Silicone oil: Lubricates rubber particles, making it easier for rubber to flow during processing, reduces internal friction of silicone rubber during processing, thereby reducing processing difficulty and improving production efficiency; reduces the viscosity of the rubber, improves the fluidity of the rubber, and makes silicone rubber easier to shape during processing, especially for products with complex shapes and structures; reduces bubbles and tiny defects in silicone rubber, and improves the density and uniformity of the product.

[0030] Hydrogenated silicone oil + Pt catalyst: Under the catalytic action of Pt, the silicon-hydrogen bond (≡Si-H) in the hydrogenated silicone oil can react with other silicone oil or silicone rubber molecules containing unsaturated bonds (such as vinyl ≡Si-Vi) to form Si-C bonds or Si-Si bonds. This cross-linking reaction is an important step in the curing and molding of silicone rubber, and can significantly improve the cross-linking density and mechanical properties of silicone rubber; through the silylation reaction catalyzed by the Pt catalyst, hydrogenated silicone oil as a cross-linking agent can effectively enhance the tensile strength, tear strength, wear resistance, aging resistance and other physical properties of silicone rubber. Under the action of Pt catalyst, hydrogenated silicone oil can cross-link and form a film at low temperature, forming a waterproof film on the surface of various substrates, effectively improving the adhesion of the protective cover to ice; hydrogenated silicone oil can form an insulating layer under the action of Pt catalyst to improve the insulation performance of the material.

[0031] Similarities between polytetrafluoroethylene film and superhydrophobic coating: Both polytetrafluoroethylene film and superhydrophobic coating have extremely low surface energy, which makes them effectively resist wetting and adhesion of liquids on their surfaces.

[0032] Differences between polytetrafluoroethylene film and super-hydrophobic coating: The key to super-hydrophobic coating lies in the combination of its surface microstructure and low surface energy materials to achieve super-hydrophobic effect. Although both have hydrophobic properties, the contact angle of super-hydrophobic coating is usually greater than 150°, showing a more excellent super-hydrophobic effect. Although the contact angle of Teflon film is also high (such as about 110° on a smooth surface), it generally does not reach the level of super-hydrophobic coating. Super-hydrophobic coatings usually have a very small rolling angle (even 0°), making it very easy for water droplets to roll or slide on their surface. However, the rolling angle of Teflon film is relatively large, and the rolling ability of water droplets on its surface is not as good as that of super-hydrophobic coating.

[0033] Example 1 (the insulating protective cover is coated with Teflon film and has a smooth surface): A method for preparing a high-speed railway contact network insulating protective cover with anti-icing performance comprises the following steps: The silicone rubber raw rubber was wrapped on the front roller of the double-roll mill, and the roller speed ratio was set to 1.3:1. At the same time, condensed water was passed through the roller to keep the temperature below 50 ℃. The roller spacing was 1 mm at the beginning, and the low-temperature thin pass time was 13 min. When mixing and eating powder, the rear roller was transferred, and then the reinforcing filler synthetic silica, the structure control agent dimethyl hydroxy silicone oil, the high temperature resistant synergist SH-826, the color powder and the silicone oil were added successively. After 5 thin passes, the material was unloaded and parked for 8 hours. After the parking, it was re-refined, the vulcanizing agent (hydrogen-containing silicone oil + Pt catalyst) was added, the temperature was set to 100 ℃, and the thin pass was 5 times, and then parked overnight. After the vulcanized silicone rubber was re-refined, it was placed in a preheated mold covered with Teflon film for molding, the pressure was set to 6 MPa, and the temperature was maintained at 170 ℃ for 4 min. After the pressing was completed, it was immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization, and 2 MPa high-pressure steam is introduced into the pipeline, and condensed water is introduced into the tail. After the secondary vulcanization is completed and the pipeline is parked at room temperature, the high-speed railway contact network insulation protective cover with anti-icing performance can be obtained.

[0034] Example 2 (spraying a super-hydrophobic coating, and preparing a wavy surface of the insulating protective cover): A method for preparing a high-speed railway contact network insulating protective cover with anti-icing performance comprises the following steps: The silicone rubber raw rubber is wrapped on the front roller of the double-roll mill, and the roller speed ratio is set to 1.3:1. At the same time, condensed water is passed through the roller to keep the temperature below 50 ℃. The roller spacing is 1 mm at the beginning, and the low-temperature thin pass time is 13 min. When mixing and eating powder, transfer the rear roller, then add reinforcing filler synthetic silica, structure control agent dimethyl hydroxy silicone oil, high temperature resistant synergist SH-826, color powder and silicone oil successively, and park for 8 hours after 5 thin passes. After the parking is over, it is re-refined, and the vulcanizing agent (hydrogen-containing silicone oil + Pt catalyst) is added. The temperature is set to 100 ℃, and the thin pass is 5 times, and then parked overnight. After the vulcanized silicone rubber is re-refined, it is placed in a preheated mold (including waves) for molding, and the pressure is set to 6 MPa and the temperature is maintained at 170 ℃ for 4 min. After the pressing is completed, it is immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization, and 2 MPa high-pressure steam is introduced into the pipeline, and condensed water is introduced into the tail. After the secondary vulcanization is completed, the super-hydrophobic coating is sprayed on the pipeline after the pipeline is parked at room temperature to obtain the high-speed railway contact network insulation protective cover with anti-icing performance.

[0035] Example 3 (the protective cover is not sprayed with a super-hydrophobic coating, nor is it covered with a Teflon film, and the surface of the prepared insulating protective cover is a smooth surface): A method for preparing a high-speed railway contact network insulating protective cover with anti-icing performance comprises the following steps: The silicone rubber raw rubber is wrapped on the front roller of the double-roll mill, and the roller speed ratio is set to 1.3:1. At the same time, condensed water is passed through the roller to keep the temperature below 50 ℃. The roller spacing is 1 mm at the beginning, and the low-temperature thin pass time is 13 min. When mixing and eating powder, transfer the rear roller, then add reinforcing filler synthetic silica, structure control agent dimethyl hydroxy silicone oil, high temperature resistant synergist SH-826, color powder and silicone oil successively, and park for 8 hours after 5 thin passes. After the parking is over, it is re-refined, and the vulcanizing agent (hydrogen-containing silicone oil + Pt catalyst) is added. The temperature is set to 100 ℃, and the thin pass is 5 times, and then parked overnight. After the vulcanized silicone rubber is re-refined, it is placed in a preheated mold for molding, and the pressure is set to 6 MPa and the temperature is maintained at 170 ℃ for 4 min. After the pressing is completed, it is immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization, and 2 MPa high-pressure steam is introduced into the pipeline, and condensed water is introduced into the tail. After the secondary vulcanization is completed and the pipeline is parked at room temperature, the high-speed railway contact network insulation protective cover with anti-icing performance can be obtained.

[0036] Example 4 (covered with Teflon film and the surface shape of the insulating protective cover is wavy): A preparation method and performance of a high-speed railway contact network insulating protective cover with anti-icing performance, comprising the following steps: The silicone rubber raw rubber is wrapped on the front roller of the double-roll mill, and the roller speed ratio is set to 1.3:1. At the same time, condensed water is passed through the roller to keep the temperature below 50 ℃. The roller spacing is 1 mm at the beginning, and the low-temperature thin pass time is 13 min. When mixing and eating powder, transfer the rear roller, then add reinforcing filler synthetic silica, structure control agent dimethyl hydroxy silicone oil, high temperature resistant synergist SH-826, color powder and silicone oil successively, and park for 8 hours after 5 thin passes. After the parking is over, it is re-refined, and the vulcanizer (hydrogen-containing silicone oil + Pt catalyst) is added. The temperature is set to 100 ℃, and the thin pass is 5 times, and then parked overnight. After the vulcanized silicone rubber is re-refined, it is placed in a preheated mold (including waves) covered with Teflon film for molding, and the pressure is set to 6 MPa and the temperature is maintained at 170 ℃ for 4 min. After the pressing is completed, it is immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization, and 2 MPa high-pressure steam is introduced into the pipeline, and condensed water is introduced into the tail. After the secondary vulcanization is completed and the pipeline is parked at room temperature, the high-speed railway contact network insulation protective cover with anti-icing performance can be obtained.

[0037] It is worth mentioning that due to the relatively high viscosity and certain softness of silicone rubber, it is placed on the front roller and the roller speed ratio is set to 1.3:1 to prevent excessive rotation and extrusion that may reduce the uniformity of subsequent addition of additives to the silicone rubber; at the same time, when mixing silicone rubber, the roller temperature should not exceed 50 degrees to avoid overheating of the rubber and sticking to the roller or burning; the low-temperature thin pass time should not be too long to prevent the rubber from sticking to the roller; parking after mixing can restore fatigue and relax stress, improve dispersion uniformity, enhance reinforcement effect, and stabilize size.

[0038] Adding vulcanizing agent during refining can enhance hardness and wear resistance, improve high temperature resistance, and improve anti-aging performance. At the same time, the vulcanization temperature should be strictly controlled to ensure that the temperature is uniform and stable to avoid affecting product quality due to temperature fluctuations.

[0039] The mold preheating makes the silicone rubber have sufficient fluidity for easy molding. The molding pressure of 6 MPa ensures that the silicone rubber has the best melting state and fluidity; it is maintained for 4 minutes to ensure that the silicone rubber can evenly fill the mold and avoid defects such as bubbles. When the vulcanized silicone rubber is re-refined and placed in a preheated mold covered with polytetrafluoroethylene film for molding, the adhesion between the film and the colloid can be enhanced, maintaining the stability of the anti-icing performance of the protective cover.

[0040] The high-pressure steam vulcanization method is used for secondary vulcanization, which is in line with the 5 mm thickness and application areas of this product, and better stabilizes the heat resistance and dynamic properties of silicone rubber.

[0041] In the later stage of mixing, the vulcanizing agent (hydrogen-containing silicone oil + Pt catalyst) is directly added for vulcanization; this can increase the viscosity and fluidity of the mixed rubber, reduce deformation after molding, and improve the dimensional stability of the product.

[0042] Secondary vulcanization immediately after the pressing is completed can improve performance stability, heat resistance, mechanical properties and extend service life; vulcanization using high-pressure steam vulcanization has the advantages of high vulcanization efficiency, good vulcanization uniformity, wide application range, strong controllability and environmental friendliness.

[0043] Preparation for the anti-icing performance test: select an ice-making cold storage; make an experimental frame, on which 5 layers of copper rod groups composed of copper rods arranged in a close-fitting manner are welded, and the cross-sectional diameter of each copper rod is 3 cm; put the experimental frame into the ice-making cold storage, and adjust the refrigeration temperature of the ice-making cold storage to -20 degrees Celsius; install and attach the 20 cm protective covers prepared in Example 1, Example 2, Example 3, and Example 4 on the four upper copper rod groups, respectively, and use cotton cloth to hold the two sides of the bottom copper rod group, leaving a 20 cm length in the middle to be sprayed with water; use a watering can to evenly spray water on the 5 layers of copper rod groups from bottom to top; freeze for 12 hours, and remove the cotton cloth on both sides of the bottom copper rod group.

[0044] Connect the lateral force rod of the handheld thrust gauge to the lateral thrust rod through threads. Before lateral pushing of the ice on each layer of copper rod group, first set the handheld thrust gauge to zero, then push, and measure the structure as shown in the following table: ; It can be seen that, compared with the state without a protective cover, the shear stress of the four embodiments is lower, and the shear stress of the polytetrafluoroethylene film and the sprayed super-hydrophobic coating is the lowest, with good low surface ability and anti-icing performance.

[0045] Preparation for the test of the heat aging resistance of the inner rubber layer 2: Using the process of Example 3, no reinforcing filler, structure control agent, high temperature resistant synergist, color powder, silicone oil and vulcanizer are added during production, and 5 ordinary matured silicone rubber sleeves with a length of 20 cm are produced; using the process of Example 3, reinforcing filler, structure control agent, high temperature resistant synergist, color powder, silicone oil and vulcanizer are added during production, and 5 inner rubber layers 2 with a length of 20 cm are produced; both are placed in an industrial constant temperature oven respectively, the oven temperature is set to 105 degrees Celsius, the baking time is 10 days, and they are taken out for use after baking.

[0046] Conductivity and tensile strength test preparation: Take a pen-type conductivity tester and a tensile tester, first use the pen-type conductivity tester to measure the conductivity of the ordinary matured silicone rubber sleeve and the inner rubber layer 2, the test environment temperature is 25 degrees Celsius; the measured results are as follows: ; Secondly, the surfaces of the two were observed under a microscope. Compared with the inner rubber layer, the surface layer of ordinary matured silicone had more serious particle splitting and poorer water seepage resistance.

[0047] From this, it can be seen that the inner rubber layer 2 has a lower conductivity after the baking aging test than silicone rubber without adding reinforcing fillers, structure control agents, high temperature resistance enhancers, color powder, silicone oil and vulcanizers. Therefore, under the influence of the temperature on the contact network and the sunlight temperature, the insulation is higher and has better electrical properties.

[0048] Then install the common matured silicone rubber sleeve and the inner rubber layer 2 on the chucks on both sides of the tensile tester, and measure the tensile force value at instantaneous fracture. The measured results are shown in the following table: ; It can be seen from this that the inner rubber layer 2 has a higher tensile strength after the baking aging test than the silicone rubber without the addition of reinforcing filler, structure control agent, high temperature resistance enhancer, color powder, silicone oil and vulcanizer. Therefore, it has better mechanical properties under the influence of the temperature on the contact network and the sunlight temperature.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A high-speed railway contact network insulation protective cover with anti-icing performance, characterized in that: The insulating protective sleeve has at least two layers, which are divided into an outer layer and an inner layer, the outer layer is an outer protective layer (1), and the inner layer is an inner rubber layer (2); The outer protective layer (1) is one of a super hydrophobic coating and a polytetrafluoroethylene film; The inner rubber layer (2) comprises the following components in percentage by weight: 24% reinforcing filler, 10% structure control agent, 3% high temperature resistant enhancer, 2% color powder, 5% silicone oil, 3% vulcanizing agent, and the balance is silicone rubber; The surface of the insulating protective cover is a wavy surface.

2. The high-speed railway contact network insulation protective cover with anti-icing performance according to claim 1 is characterized in that: The silicone rubber raw rubber is methyl vinyl silicone rubber, the reinforcing filler is synthetic silicon dioxide, the structure control agent is dimethyl hydroxy silicone oil, and the vulcanizing agent is a mixture of hydrogen-containing silicone oil and Pt catalyst in a ratio of 1:

2.

3. The high-speed railway contact network insulation protective cover with anti-icing performance according to claim 2 is characterized in that: The outer protective layer (1) is a super hydrophobic coating, and the surface of the insulating protective sleeve is a wavy surface.

4. The high-speed railway contact network insulation protective cover with anti-icing performance according to claim 2 is characterized in that: The outer protective layer (1) is a polytetrafluoroethylene film, and the surface of the insulating protective sleeve is a wavy surface.

5. A method for preparing the high-speed railway contact network insulating protective cover with anti-icing performance as claimed in claim 3, characterized in that: The following steps are involved: Step 1: Wrap the silicone rubber on the front roller of the two-roll mill, set the roller speed ratio to 1.3:1, and let condensed water flow through the rollers at the same time, keeping the temperature below 50°C. The roller spacing is 1 mm at the beginning, and the low-temperature thin-pass time is 13 min; when mixing and eating powder, transfer the package to the rear roller, and then add reinforcing filler synthetic silica, structure control agent, high-temperature resistant synergist, color powder and silicone oil in turn, pass the thin-pass 5 times and then park for 8 hours; Step 2: After the storage, re-refine, add vulcanizing agent, set the temperature to 180 ℃, pass through 5 times, and continue to store for 1 day; Step 3: Re-refining the vulcanized silicone rubber in step 2 and placing it in a preheated mold with a wavy surface for molding, setting the pressure to 6 MPa and the temperature to 170 °C, and keeping the molding for 4 minutes; Step 4: After the pressing is completed, it is immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization. 2MPa high-pressure steam is passed into the pipeline for 2h, and condensed water is passed at the tail; Step 5: After the secondary vulcanization is completed, let it stand at room temperature and then spray a super-hydrophobic coating to obtain an insulating protective cover.

6. A method for preparing the high-speed railway contact network insulating protective cover with anti-icing performance as claimed in claim 4, characterized in that: The following steps are involved: Step 1: Wrap the silicone rubber on the front roller of the two-roll mill, set the roller speed ratio to 1.3:1, and let condensed water flow through the rollers at the same time, keeping the temperature below 50°C. The roller spacing is 1 mm at the beginning, and the low-temperature thin-pass time is 13 min; when mixing and eating powder, transfer the package to the rear roller, and then add reinforcing filler synthetic silica, structure control agent, high-temperature resistant synergist, color powder and silicone oil in turn, pass the thin-pass 5 times and then park for 8 hours; Step 2: After the storage, re-refine, add vulcanizing agent, set the temperature to 180 ℃, pass through 5 times, and continue to store for 1 day; Step 3: After refining the vulcanized silicone rubber obtained in step 2, put it into a preheated mold with a wave surface covered with polytetrafluoroethylene for molding, set the pressure to 6 MPa, the temperature to 170 ° C, and keep the molding for 4 minutes; Step 4: After the pressing is completed, it is immediately sent to a sealed high-pressure vulcanization pipeline for secondary vulcanization. The secondary vulcanization of silicone rubber adopts high-pressure steam vulcanization. 2 MPa high-pressure steam is passed into the pipeline for 2 hours, and condensed water is passed at the tail; Step 5: After the secondary vulcanization is completed, let it stand at room temperature and then spray a super-hydrophobic coating to obtain an insulating protective cover.

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