Traction cable for track and production process thereof

Abstract

The invention relates to the technical field of cable production and processing, and particularly discloses a traction cable for a track and a production process of the traction cable. The invention relates to a traction cable for a track, which comprises a transmission line and a sheath coated outside the transmission line. The sheath is prepared from the following raw materials: 120 to 130 parts of polyvinyl chloride resin, 20 to 24 parts of aluminum hydroxide, 4 to 6 parts of calcium silicate, 1 to 2 parts of dioctyl tin laurate, 27 to 32 parts of modified glass fiber, 2 to 3 parts of an anti-aging agent, 9 to 12 parts of polyetherimide, 25 to 30 parts of modified kaolin, 10 to 13 parts of talcum powder, 9 to 14 parts of dolomite, 5 to 8 parts of magnesium oxide, 2 to 4 parts of an antioxidant and 1 to 3 parts of a silicone lubricant. And 2-4 parts of a maleic anhydride grafted AS blend. The traction cable for the track prepared by the invention has better mechanical properties such as flexibility and wear resistance, so that the cable has better durability.

Description

Technical Field

[0001] This application relates to the technical field of cable production and processing, and more specifically, it relates to a traction cable for tracks and its production process. Background Art

[0002] The traction cable for tracks is a special cable designed for rail transit systems, with characteristics such as high current-carrying capacity, high-temperature resistance, flame retardancy, corrosion resistance, mechanical strength, signal transmission performance, and environmental adaptability. It is suitable for power transmission and signal transmission in rail transit systems to drive train operation and control train systems.

[0003] The structure of the traction cable for tracks usually includes a transmission line and a sheath wrapped around the outside of the transmission line. The raw materials of the sheath include a polymer matrix, a filler, a plasticizer, a stabilizer, and a flame retardant. The prepared sheath has the functions of protecting the internal structure, waterproofing and moisture-proofing, and chemical corrosion resistance.

[0004] However, in actual use, the surface of the traction cable for tracks is severely worn due to long-term exposure to the external environment and contact with other objects, which subsequently affects the practicability of the cable. Summary of the Invention

[0005] In order to improve the problem of severe surface wear of the traction cable for tracks, this application provides a traction cable for tracks and its production process.

[0006] In a first aspect, this application provides a traction cable for tracks, adopting the following technical solution: A traction cable for tracks, comprising a transmission line and a sheath wrapped around the outside of the transmission line, characterized in that, by weight, the sheath comprises the following raw materials: 120 - 130 parts of polyvinyl chloride resin, 20 - 24 parts of aluminum hydroxide, 4 - 6 parts of calcium silicate, 1 - 2 parts of dioctyltin laurate, 27 - 32 parts of modified glass fiber, 2 - 3 parts of anti-aging agent, 9 - 12 parts of polyetherimide, 25 - 30 parts of modified kaolin, 10 - 13 parts of talcum powder, 9 - 14 parts of dolomite, 5 - 8 parts of magnesium oxide, 2 - 4 parts of antioxidant, 1 - 3 parts of silicone lubricant, 2 - 4 parts of maleic anhydride grafted AS blend.

[0007] By adopting the above technical solutions, the polyvinyl chloride resin has good insulation performance, can effectively isolate the current, prevent short circuits or electric leakage during the use of the cable, and ensure the safety of power transmission; the polyvinyl chloride resin also has good mechanical strength, flexibility and weather resistance, can prevent abrasion, scratching and mechanical damage, and can resist ultraviolet rays, moisture, salt spray and chemical corrosion, so that the cable is not easily damaged during bending and installation, and the service life of the cable is extended. Aluminum hydroxide, as a flame retardant, improves the flame retardant performance of the cable. Calcium silicate has excellent high temperature resistance and, as a fireproof layer, can effectively prevent the spread of fire. Dioctyltin laurate, as a stabilizer, improves the thermal stability of the cable. Modified glass fiber has extremely high tensile strength and rigidity, improves the mechanical strength of the cable sheath, enhances its tensile, compressive and impact resistance, and protects the internal structure of the cable from external physical damage; glass fiber also has good high temperature resistance, fireproof and flame retardant and chemical corrosion resistance, protects the fire resistance of the cable and is not eroded by corrosive media.

[0008] The anti-aging agent can inhibit the destructive effect of ultraviolet rays on the cable sheath, reduce the material aging caused by ultraviolet rays, and improve the weather resistance of the cable in outdoor environments; polyetherimide has excellent mechanical properties, thermal stability and electrical insulation properties, can prevent the cable from being physically damaged during installation and use, and extend the service life of the cable. Modified kaolin has good electrical insulation properties, hardness, rigidity and flame retardant properties. Talc powder has electrical insulation properties, mechanical properties, flame retardant properties and heat resistance. Adding them to the cable sheath can improve its electrical insulation properties, fire resistance and heat resistance, enhance the electrical safety and stability of the cable, enhance its mechanical strength, make the cable more durable during installation and use, and reduce physical damage.

[0009] Dolomite has certain electrical insulation properties, mechanical strength, flame retardant properties and heat resistance. As a filler, it can increase the comprehensive performance of the cable. Cooperating with modified kaolin and talc powder can improve the corresponding performance of the cable, make the cable more durable during installation and use, and enhance the electrical safety and stability of the cable. Magnesium oxide has excellent electrical insulation properties, extremely high heat resistance, flame retardant properties, mechanical strength, corrosion resistance and thermal stability. Cooperating with aluminum hydroxide can improve the comprehensive performance of the cable and ensure the durability and safety of the cable. The antioxidant is used to improve the antioxidant performance of the cable sheath and extend the service life of the cable. The silicone lubricant has an extremely low friction coefficient, can significantly reduce the friction during the production processes such as extrusion, stretching and winding of the cable sheath, and protect the cable sheath from damage. The maleic anhydride grafted AS blend improves the compatibility of the cable outer sheath, makes the mixing of different polymers uniform, and improves the comprehensive performance such as the mechanical properties and processing properties of the system. Each component cooperates with each other, and the obtained cable sheath has excellent mechanical properties, abrasion resistance and durability, and extends the service life of the cable outer sheath.

[0010] Optionally, the preparation method of the modified glass fiber includes the following steps: (1) Disperse the glass fiber in a potassium permanganate solution, stir at a temperature of 65 - 70 °C for 20 - 25 min, wash with water, then disperse in a titanate coupling agent, filter, and dry to obtain pretreated glass fiber; (2) Disperse the modified chitosan in an acetic acid solution, add polyester fiber and nano nickel, stir at a temperature of 90 - 95 °C for 25 - 30 min, and dry to obtain pretreated polyester fiber; (3) Disperse the pretreated glass fiber obtained in step (1) in deionized water, add the pretreated polyester fiber obtained in step (2), stir at a temperature of 90 - 95 °C for 2 - 3 h, and dry to obtain modified glass fiber.

[0011] By adopting the above technical solution, the glass fiber is pretreated with a potassium permanganate solution, and the organic pollutants on the surface are removed through an oxidation reaction to improve the surface activity of the glass fiber. Then it is dispersed in a titanate coupling agent, and the titanate coupling agent can chemically react with the hydroxyl groups on the surface of the glass fiber to form a strong chemical bond, significantly improving the interfacial bonding force between the glass fiber and other components.

[0012] Polyester fiber, dibutyl phthalate are added to the acetic acid solution of modified chitosan. The polyester fiber has good flexibility, weather resistance, flame retardancy and wear resistance. The modified chitosan can coat on the surface of the polyester fiber, increasing the mechanical strength and wear resistance of the polyester fiber. Nano nickel has high hardness, strength and corrosion resistance, and nano nickel can be loaded on the surface of the polyester fiber. The modified chitosan has a certain viscosity, making the bonding between nano nickel and polyester fiber more stable. The mixture of modified chitosan, polyester fiber and nano nickel improves the mechanical properties and wear resistance of the polyester fiber. Subsequently, the pretreated polyester fiber and the pretreated glass fiber are mixed, and the polyester fiber and the glass fiber are wound and loaded with each other to form a network structure, improving the comprehensive properties such as the tensile strength, flexural strength and impact resistance of the glass fiber. Subsequently, when applied to cables, the corresponding properties of the cables are improved.

[0013] Optionally, the mass ratio of the glass fiber, polyester fiber, modified chitosan and nano nickel is 1:0.5 - 0.7:0.2 - 0.3:0.07 - 0.09.

[0014] By adopting the above technical solution, further limiting the mass ratio of glass fiber, polyester fiber, modified chitosan and nano-nickel within a certain range, the obtained modified glass fiber has good mechanical properties and wear resistance, the polyester fiber has good flexibility, weather resistance, flame retardancy and wear resistance, nano-nickel has high hardness, strength and corrosion resistance, nano-nickel can be loaded on the surface of polyester fiber, and modified chitosan makes the adhesion between nano-nickel and polyester fiber more stable. The glass fiber, polyester fiber, modified chitosan and nano-nickel cooperate with each other to have a synergistic effect, jointly improving the mechanical properties and wear resistance of the glass fiber. Subsequently, it is applied to the cable to improve the tensile strength, bending strength, impact resistance, wear resistance and corrosion resistance of the cable.

[0015] Optionally, the preparation method of the modified chitosan includes the following steps: adding trimethylammonium glycidyl chloride to an aqueous acetic acid solution of chitosan, heating and reacting for 6-8 h to obtain quaternized chitosan, then dispersing it in deionized water, adding nano-silica and xanthan gum, stirring at a temperature of 80-85 °C for 2-3 h, and drying to obtain modified chitosan.

[0016] By adopting the above technical solution, the reaction of the aqueous acetic acid solution of chitosan and trimethylammonium glycidyl chloride generates quaternized chitosan, enhancing the water solubility, antibacterial activity and biocompatibility of chitosan. Nano-silica has good mechanical strength and wear resistance and can be dispersed in the network structure of chitosan, increasing the mechanical strength and toughness of chitosan. Xanthan gum crosslinks with chitosan to form stable covalent bonds between the amino group of chitosan and the carboxyl group of xanthan gum, improving the mechanical properties of chitosan, making the loading of nano-silica more stable, and subsequently improving the biocompatibility, antibacterial properties, mechanical strength and viscosity of chitosan, which in turn helps the modified glass fiber and improves the corresponding properties of the glass fiber.

[0017] Optionally, the mass ratio of chitosan, nano-silica and xanthan gum is 1:0.5-0.6:0.1-0.2.

[0018] By adopting the above technical solution, further limiting the mass ratio of chitosan, nano-silica and xanthan gum within a certain range, improving the viscosity, mechanical properties and wear resistance of chitosan. Chitosan crosslinks with xanthan gum to form a network structure, and nano-silica can be loaded in the network structure, improving the mechanical properties and wear resistance of chitosan. Subsequently, it is applied to the modified glass fiber to improve the comprehensive properties of the glass fiber, making the adhesion between the glass fiber and the polyester fiber more stable, and further improving the corresponding properties of the cable.

[0019] Optionally, the preparation method of the modified kaolin includes the following steps: (1) Calcinate kaolin at 800 - 900 °C for 4 - 5 h, then disperse it in sodium hydroxide solution, stir for 1 - 2 h, wash with water, and filter to obtain pretreated kaolin; (2) Immerse carbon fiber in nitric acid solution with a mass fraction of 50 - 60%, take it out and wash it thoroughly with sodium hydroxide solution and water, then disperse it in phenolic resin solution and soak for 20 - 30 min, and dry to obtain pretreated carbon fiber; (3) Disperse the pretreated kaolin obtained in step (1) in deionized water, add the pretreated carbon fiber and modified hydroxyethyl cellulose obtained in step (2), stir at 60 - 65 °C for 1 - 2 h, and dry to obtain modified kaolin.

[0020] By adopting the above technical solution, during the calcination process, organic substances and carbonaceous impurities in kaolin will be oxidized and removed, changing the microstructure of kaolin, making its particles more compact, improving its hardness and wear resistance. Then, treat kaolin with sodium hydroxide solution to promote the alkaline activation of kaolin, change its surface properties, and improve its adsorption performance and catalytic activity.

[0021] Carbon fiber has extremely high strength, wear resistance, and corrosion resistance. Nitric acid solution chemically modifies the surface of carbon fiber, introducing oxygen-containing functional groups to improve the surface activity of carbon fiber. Then, wash it thoroughly with sodium hydroxide solution and water, and disperse it in phenolic resin solution. Phenolic resin adheres to the surface of carbon fiber, improving the wear resistance and chemical stability of carbon fiber. Moreover, phenolic resin can firmly adhere to the surface of carbon fiber, forming a good interfacial bond, which helps the subsequent mixing of carbon fiber with other components.

[0022] Mix the pretreated carbon fiber and pretreated kaolin. The carbon fiber can be loaded on the surface and pores of kaolin, improving the strength, wear resistance, and impact resistance of kaolin. Modified hydroxyethyl cellulose has a certain viscosity, making the carbon fiber and kaolin adhere tightly, and improving the dispersibility and adhesiveness of carbon fiber and kaolin in the matrix, enhancing the mechanical properties, thermal stability, flame retardancy, and wear resistance of kaolin. In addition, phenolic resin and modified hydroxyethyl cellulose cooperate to improve the bonding performance of the system, making the modified kaolin have better performance stability, and subsequent application in cables can improve the mechanical properties and wear resistance of cables.

[0023] Optionally, the mass ratio of the kaolin, carbon fiber, and modified hydroxyethyl cellulose is 1:0.3 - 0.5:0.2 - 0.3.

[0024] By adopting the above technical solution, the mass ratio of kaolin, carbon fiber and modified hydroxyethyl cellulose is further limited within a certain range to improve the mechanical properties, mechanical strength and wear resistance of kaolin. The carbon fiber can be loaded on the surface and pores of kaolin to improve the strength, wear resistance and corrosion resistance of kaolin. The modified hydroxyethyl cellulose has a certain viscosity, enabling the carbon fiber and kaolin to adhere tightly, improving the mechanical properties, thermal stability, flame retardant properties and wear resistance of kaolin. Subsequently, it is applied to cables to improve the comprehensive performance of the cables.

[0025] Optionally, the preparation method of the modified hydroxyethyl cellulose includes the following steps: Disperse graphene in glycerol, stir evenly, add hydroxyethyl cellulose and dimethyl methylphosphonate, and stir at a temperature of 80-85 °C for 2-3 h, then cool to room temperature to obtain the modified hydroxyethyl cellulose.

[0026] By adopting the above technical solution, graphene is dispersed in glycerol to reduce the interaction force between graphene layers and improve the dispersion stability of graphene in the solution. Adding hydroxyethyl cellulose not only improves the dispersion of graphene in the matrix, prevents the agglomeration of graphene sheets, and improves the uniformity and stability of the composite material; moreover, graphene has the characteristics of high strength and high modulus, and after combining with hydroxyethyl cellulose, the mechanical properties of the system are improved, including strength, stiffness and toughness. Dimethyl methylphosphonate has good chemical stability and cooperates with hydroxyethyl cellulose to prevent graphene agglomeration and improve the uniformity and stability of the system. The modified hydroxyethyl cellulose has good viscosity, chemical stability, flame retardant properties and mechanical properties, and is subsequently applied to modified kaolin to improve the corresponding properties and property stability of kaolin.

[0027] Preferably, the mass ratio of hydroxyethyl cellulose, graphene and dimethyl methylphosphonate is 1 g: 50-60 mg: 2-3 g.

[0028] By adopting the above technical solution, the mass ratio of hydroxyethyl cellulose, graphene and dimethyl methylphosphonate is further limited within a certain range to improve the viscosity, stability and mechanical properties of hydroxyethyl cellulose. As a dispersant, hydroxyethyl cellulose improves the dispersion of graphene and dimethyl methylphosphonate in the matrix, prevents their agglomeration, and improves the uniformity and stability of the system. Moreover, graphene has the characteristics of high strength and high modulus, and after combining with hydroxyethyl cellulose and dimethyl methylphosphonate, the mechanical properties of the system are improved, including strength, stiffness and toughness.

[0029] Second aspect, the present application provides a production process for a traction cable for tracks, including the following steps: Mix polyvinyl chloride resin, aluminum hydroxide, calcium silicate, dioctyltin laurate, modified glass fiber, anti-aging agent, polyetherimide, modified kaolin, talc powder, dolomite, magnesium oxide, antioxidant, silicone lubricant, and maleic anhydride grafted AS blend, and stir at a temperature of 65 - 70 °C and a speed of 4000 - 4500 r / min for 30 - 35 min to obtain a mixture, then melt and extrude it to solidify on the outer surface of the transmission line to obtain a traction cable for tracks.

[0030] By adopting the above technical solution, each raw material of the present application is mixed, and the obtained mixture is used to prepare a cable sheath, which improves the mechanical properties, abrasion resistance, and mechanical strength of the sheath, and prolongs the service life of the cable sheath.

[0031] In summary, the present application has the following beneficial effects: 1. The polyvinyl chloride resin in the present application has good insulation performance, can effectively isolate the current, prevent short circuits or electric leakage during the use of the cable, and ensure the safety of power transmission; the polyvinyl chloride resin also has good mechanical strength, flexibility, and weather resistance, can prevent abrasion, scratches, and mechanical damage, and can resist ultraviolet rays, moisture, salt spray, and chemical corrosion, making the cable not easily damaged during bending and installation, and prolonging the service life of the cable.

[0032] 2. The modified glass fiber in the present application has extremely high tensile strength and rigidity, improves the mechanical strength of the cable sheath, enhances its tensile, compressive, and impact resistance, and protects the internal structure of the cable from external physical damage; the glass fiber also has good high-temperature resistance, fire resistance, and chemical corrosion resistance, protecting the fire resistance of the cable and preventing it from being eroded by corrosive media.

[0033] 3. The modified kaolin in the present application has good electrical insulation performance, hardness, rigidity, and flame retardancy, and the talc powder has electrical insulation performance, mechanical properties, flame retardancy, and heat resistance. Adding them to the cable sheath can improve its electrical insulation performance, fire resistance, and heat resistance, enhance the electrical safety and stability of the cable, enhance its mechanical strength, make the cable more durable during installation and use, and reduce physical damage. Specific embodiments

[0034] Preparation example of modified glass fiber Preparation example 1 - 1 The preparation method of modified glass fiber includes the following steps: (1) Disperse 1.2 kg of glass fiber in 2 L of a potassium permanganate solution with a mass fraction of 5%, stir at a temperature of 70 °C for 25 min, wash with water, then disperse it in 1.5 L of titanate coupling agent, filter, and dry to obtain pretreated glass fiber; (2) Disperse 0.5 kg of modified chitosan in 1 L of acetic acid solution with a mass fraction of 20%, add polyester fiber and nano-nickel, stir at 95 °C for 30 min, and dry to obtain pretreated polyester fiber; (3) Disperse the pretreated glass fiber in step (1) in 3 L of deionized water, add the pretreated polyester fiber in step (2), stir at 95 °C for 3 h, and dry to obtain modified glass fiber.

[0035] The mass ratio of glass fiber, polyester fiber, modified chitosan and nano-nickel is 1:0.5:0.3:0.09.

[0036] The preparation method of modified chitosan includes the following steps: Add 0.5 L of trimethylammonium glycidyl chloride to 3 L of chitosan acetic acid aqueous solution, heat and react for 8 h to obtain quaternized chitosan, then disperse it in 2 L of deionized water, add nano-silica and xanthan gum, stir at 80 - 85 °C for 2 - 3 h, and dry to obtain modified chitosan. Among them, the chitosan acetic acid aqueous solution is obtained by dissolving 1 kg of chitosan in 2 L of acetic acid solution with a mass fraction of 15%.

[0037] The mass ratio of chitosan, nano-silica and xanthan gum is 1:0.6:0.2.

[0038] Preparation Examples 1-2 The difference from Preparation Example 1-1 is that in step (2), modified chitosan is not added.

[0039] Preparation Example 1-3 The difference from Preparation Example 1-1 is that in step (2), polyester fiber is not added.

[0040] Preparation Example 1-4 The difference from Preparation Example 1-1 is that in step (2), nano-nickel is not added.

[0041] Preparation Example 1-5 The difference from Preparation Example 1-1 is that the mass ratio of glass fiber, polyester fiber, modified chitosan and nano-nickel is 1:0.7:0.2:0.07.

[0042] Preparation Example 1-6 The difference from Preparation Example 1-1 is that the mass ratio of glass fiber, polyester fiber, modified chitosan and nano-nickel is 1:0.2:0.5:0.12.

[0043] Preparation Example 1-7 The difference from Preparation Example 1-1 is that in the preparation method of modified chitosan, nano-silica is not added.

[0044] Preparation Example 1-8 It is different from Preparation Example 1-1 in that xanthan gum is not added in the preparation method of the modified chitosan.

[0045] Preparation Example 1-9 It is different from Preparation Example 1-1 in that the mass ratio of the chitosan, nano-silica and xanthan gum is 1:0.5:0.1.

[0046] Preparation Example 1-10 It is different from Preparation Example 1-1 in that the mass ratio of the chitosan, nano-silica and xanthan gum is 1:0.1:0.5.

[0047] Preparation Example of Modified Kaolin Preparation Example 2-1 The preparation method of the modified kaolin includes the following steps: (1) Roast 1.8 kg of kaolin at 850 °C for 5 h, then disperse it in 2.2 L of a sodium hydroxide solution with a mass fraction of 12%, stir for 2 h, wash with water, filter, and obtain pretreated kaolin; (2) Immerse 1 kg of carbon fiber in 1.3 L of a nitric acid solution with a mass fraction of 60%, take it out and wash it thoroughly with a sodium hydroxide solution and water, then disperse it in 1.2 L of a phenolic resin ethanol solution with a mass concentration of 0.3% and soak for 25 min, and dry to obtain pretreated carbon fiber; (3) Disperse the pretreated kaolin obtained in step (1) in 4 L of deionized water, add the pretreated carbon fiber and modified hydroxyethyl cellulose obtained in step (2), stir at a temperature of 65 °C for 2 h, and dry to obtain modified kaolin.

[0048] The mass ratio of kaolin, carbon fiber and modified hydroxyethyl cellulose is 1:0.5:0.2.

[0049] The preparation method of the modified hydroxyethyl cellulose includes the following steps: Disperse graphene in 8 L of glycerol, stir evenly, add 5 kg of hydroxyethyl cellulose and dimethyl methylphosphonate, stir at a temperature of 85 °C for 3 h, and cool to room temperature to obtain modified hydroxyethyl cellulose.

[0050] The mass ratio of hydroxyethyl cellulose, graphene and dimethyl methylphosphonate is 1 g:60 mg:3 g.

[0051] Preparation Example 2-2 It is different from Preparation Example 2-1 in that in step (2), carbon fiber is not added.

[0052] Preparation Example 2-3 It is different from Preparation Example 2-1 in that in step (3), modified hydroxyethyl cellulose is not added.

[0053] Preparation Example 2-4 It is different from Preparation Example 2-1 in that the mass ratio of kaolin, carbon fiber and modified hydroxyethyl cellulose is 1:0.3:0.3.

[0054] Preparation Example 2-5 It is different from Preparation Example 2-1 in that the mass ratio of kaolin, carbon fiber and modified hydroxyethyl cellulose is 1:0.1:0.6.

[0055] Preparation Example 2-6 It is different from Preparation Example 2-1 in that graphene is not added in the preparation method of modified hydroxyethyl cellulose.

[0056] Preparation Example 2-7 It is different from Preparation Example 2-1 in that dimethyl methylphosphonate is not added in the preparation method of modified hydroxyethyl cellulose.

[0057] Preparation Example 2-8 It is different from Preparation Example 2-1 in that the mass ratio of hydroxyethyl cellulose, graphene and dimethyl methylphosphonate is 1 g:50 mg:2 g.

[0058] Preparation Example 2-9 It is different from Preparation Example 2-1 in that the mass ratio of hydroxyethyl cellulose, graphene and dimethyl methylphosphonate is 1 g:30 mg:6 g.

[0059] Example 1 A traction cable for railways, comprising a transmission line and a sheath coated outside the transmission line, characterized in that, by weight, the sheath comprises the following raw materials: 120 kg of polyvinyl chloride resin, 20 kg of aluminum hydroxide, 4 kg of calcium silicate, 1 kg of dioctyltin laurate, 27 kg of modified glass fiber, 2 kg of anti-aging agent, 9 kg of polyetherimide, 25 kg of modified kaolin, 10 kg of talcum powder, 9 kg of dolomite, 5 kg of magnesium oxide, 2 kg of antioxidant, 1 kg of silicone lubricant, 2 kg of maleic anhydride grafted AS blend.

[0060] The anti-aging agent is ultraviolet absorber UV384-2, antioxidant 1076, the silicone lubricant is high molecular weight silicone powder FT-333, and the maleic anhydride grafted AS blend is purchased from Dongguan Shenghao Plastic Raw Materials Co., Ltd., model AS-01.

[0061] The production process of the traction cable for tracks includes the following steps: Mix polyvinyl chloride resin, aluminum hydroxide, calcium silicate, dioctyltin laurate, modified glass fiber, anti-aging agent, polyetherimide, modified kaolin, talcum powder, dolomite, magnesium oxide, antioxidant, silicone lubricant, and maleic anhydride-grafted AS blend. Stir at a temperature of 70°C and a speed of 4500 r / min for 35 min to obtain a mixed material, then melt-extrude and solidify it on the outer surface of the transmission line to obtain the traction cable for tracks.

[0062] The extrusion temperature of the extruder is 135°C, and the rotation speed of the extruder is 410 rpm / min.

[0063] The modified glass fiber is prepared according to Preparation Example 1-1, and the modified kaolin is prepared according to Preparation Example 2-1.

[0064] Example 2 A traction cable for tracks, different from that in Example 1, in terms of weight, the sheath includes the following raw materials: 130 kg of polyvinyl chloride resin, 24 kg of aluminum hydroxide, 6 kg of calcium silicate, 2 kg of dioctyltin laurate, 32 kg of modified glass fiber, 3 kg of anti-aging agent, 12 kg of polyetherimide, 30 kg of modified kaolin, 13 kg of talcum powder, 14 kg of dolomite, 8 kg of magnesium oxide, 4 kg of antioxidant, 3 kg of silicone lubricant, and 4 kg of maleic anhydride-grafted AS blend.

[0065] Example 3 A traction cable for tracks, different from that in Example 1, in that the modified glass fiber is prepared according to Preparation Example 1-2.

[0066] Example 4 A traction cable for tracks, different from that in Example 1, in that the modified glass fiber is prepared according to Preparation Example 1-3.

[0067] Example 5 A traction cable for tracks, different from that in Example 1, in that the modified glass fiber is prepared according to Preparation Example 1-4.

[0068] Example 6 A traction cable for tracks, different from that in Example 1, in that the modified glass fiber is prepared according to Preparation Example 1-5.

[0069] Example 7 A traction cable for tracks, different from that in Example 1, in that the modified glass fiber is prepared according to Preparation Example 1-6.

[0070] Example 8 A traction cable for tracks, different from that in Example 1, in that the modified glass fiber is prepared according to Preparation Example 1-7.

[0071] Example 9 A traction cable for tracks, which is different from that of Example 1 in that the modified glass fiber is prepared by Preparation Examples 1-8.

[0072] Example 10 A traction cable for tracks, which is different from that of Example 1 in that the modified glass fiber is prepared by Preparation Examples 1-9.

[0073] Example 11 A traction cable for tracks, which is different from that of Example 1 in that the modified glass fiber is prepared by Preparation Examples 1-10.

[0074] Example 12 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-2.

[0075] Example 13 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-3.

[0076] Example 14 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-4.

[0077] Example 15 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-5.

[0078] Example 16 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-6.

[0079] Example 17 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-7.

[0080] Example 18 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-8.

[0081] Example 19 A traction cable for tracks, which is different from that of Example 1 in that the modified kaolin is prepared by Preparation Example 2-9.

[0082] Comparative Example 1 A traction cable for tracks, which is different from that of Example 1 in that no modified glass fiber is added.

[0083] Comparative Example 2 A traction cable for tracks, which is different from that of Example 1 in that an equal amount of glass fiber is used to replace the modified glass fiber.

[0084] Comparative Example 3 A traction cable for tracks, which is different from that of Example 1 in that no modified kaolin is added.

[0085] Comparative Example 4 A traction cable for tracks, which is different from that of Example 1 in that an equal amount of kaolin is used to replace the modified kaolin.

[0086] Performance detection test The traction cables for tracks prepared in Examples 1-19 and Comparative Examples 1-4 were subjected to performance tests.

[0087] Tensile strength test: Tested in accordance with the standard GB / T 1040.3-2006; Elongation at break test: Tested in accordance with the standard GB / T1040.3-2006; The relative volume abrasion of the traction cable for tracks was tested in accordance with the standard GB / T 9867-2008 "Determination of Abrasion Resistance of Vulcanized Rubber or Thermoplastic Rubber (Rotating Drum Abrasion Machine Method)"; The hardness of the material was tested with a Type D Shore hardness tester in accordance with GB / T2411-2008, and the thickness of the sample piece was 5 mm. The tensile shear strength test was carried out on a UTM6503 type electronic universal testing machine in accordance with GB / T7124-2008; The corrosion resistance was tested according to the procedure specified in ASTM B117, and the test results are shown in Table 1.

[0088] Table 1 Test data of examples and comparative examples

[0089] Combined with the examples and the data in Table 1, it can be seen that the traction cables for tracks made in Examples 1-2, Example 6, Example 10, Example 14 and Example 18 have good mechanical properties, corrosion resistance and wear resistance. Among them, the tensile strength of Example 1 is 39.8 MPa, the elongation at break is 482%, the tensile shear strength is 0.98 MPa, and the relative volume abrasion is 21 mm 3 , and the corrosion resistance is 1200 h. It shows that the various components of the present application cooperate with each other, and the obtained cable sheath has excellent mechanical properties, wear resistance and durability, and extends the service life of the cable outer sheath.

[0090] In the preparation method of the modified glass fiber in Example 3, modified chitosan is not added. In the preparation method of the modified glass fiber in Example 4, polyester fiber is not added. In the preparation method of the modified glass fiber in Example 5, nano nickel is not added. In Example 7, the mass ratios of glass fiber, polyester fiber, modified chitosan and nano nickel are changed. It can be seen from Table 1 that, compared with Example 1, the performance of tensile strength, elongation at break, tensile shear strength, abrasion loss and corrosion resistance of Examples 3 - 5 are worse than those of Example 1, while the corresponding performance of Example 7 is significantly better than that of Examples 3 - 5, but worse than that of Example 1, indicating that nano nickel has high hardness, strength and corrosion resistance, nano nickel can be loaded on the surface of polyester fiber, modified chitosan makes the adhesion between nano nickel and polyester fiber more stable, and the combination of glass fiber, polyester fiber, modified chitosan and nano nickel has a synergistic effect, jointly improving the mechanical properties and wear resistance of glass fiber. Subsequently, when applied to cables, it can improve the tensile strength, bending strength, impact resistance, wear resistance and corrosion resistance of the cables.

[0091] In the preparation method of the modified chitosan in Example 8, nano silica is not added. In the preparation method of the modified chitosan in Example 9, xanthan gum is not added. In Example 11, the mass ratios of chitosan, nano silica and xanthan gum are changed. It can be seen from Table 1 that, compared with Example 1, the performance of tensile strength, elongation at break, tensile shear strength, abrasion loss and corrosion resistance of Examples 8 - 9 are better than those of Example 3, while the corresponding performance of Example 11 is significantly better than that of Examples 8 - 9, indicating that chitosan crosslinks with xanthan gum to form a network structure, nano silica can be loaded in the network structure, improving the mechanical properties and wear resistance of chitosan. Subsequently, when applied to the modified glass fiber, it can improve the comprehensive performance of the glass fiber, make the adhesion between the glass fiber and the polyester fiber more stable, and further improve the corresponding performance of the cable.

[0092] In the preparation method of the modified kaolin in Example 12, carbon fiber is not added. In the preparation method of the modified kaolin in Example 13, modified hydroxyethyl cellulose is not added. In Example 15, the mass ratios of kaolin, carbon fiber and modified hydroxyethyl cellulose are changed. It can be seen from Table 1 that, compared with Example 1, the performance of tensile strength, elongation at break, tensile shear strength, abrasion loss and corrosion resistance of Examples 12 - 15 are worse than those of Example 1, while the corresponding performance of Example 15 is significantly better than that of Examples 12 - 13, but worse than that of Example 1, indicating that carbon fiber can be loaded on the surface and pores of kaolin, improving the strength, wear resistance and corrosion resistance of kaolin. Modified hydroxyethyl cellulose has a certain viscosity, making the adhesion between carbon fiber and kaolin tight, improving the mechanical properties, thermal stability, flame retardant properties and wear resistance of kaolin. Subsequently, when applied to cables, it can improve the comprehensive performance of the cables.

[0093] In the preparation method of modified hydroxyethyl cellulose in Example 16, graphene is not added. In the preparation method of modified hydroxyethyl cellulose in Example 17, dimethyl methylphosphonate is not added. In Example 19, the mass ratio of hydroxyethyl cellulose, graphene and dimethyl methylphosphonate is changed. As can be seen from Table 1, compared with Example 1, the performance of tensile strength, elongation at break, tensile shear strength, abrasion loss and corrosion resistance in Examples 16 - 17 are all better than those in Example 13, while the corresponding performance in Example 19 is significantly better than that in Examples 16 - 17, indicating that hydroxyethyl cellulose, as a dispersant, improves the dispersion of graphene and dimethyl methylphosphonate in the matrix, prevents their agglomeration, and improves the uniformity and stability of the system. Moreover, graphene has the characteristics of high strength and high modulus. After combining with hydroxyethyl cellulose and dimethyl methylphosphonate, the mechanical properties of the system are improved, including strength, stiffness and toughness.

[0094] In Comparative Example 1, modified glass fiber is not added. In Comparative Example 3, modified kaolin is not added. As can be seen from Table 1, compared with Example 1, the performance of tensile strength, elongation at break, tensile shear strength, abrasion loss and corrosion resistance in Comparative Example 1 and Comparative Example 3 are all worse than those in Example 1, indicating that the modified glass fiber has extremely high tensile strength and rigidity, improves the mechanical strength of the cable sheath, and enhances its tensile, compressive and impact resistance; the modified kaolin has good electrical insulation properties, hardness, rigidity and flame retardancy, enhances the mechanical strength of the cable, makes the cable more durable during installation and use, and reduces physical damage.

[0095] In Comparative Example 2, the modified glass fiber is replaced by an equal amount of glass fiber. In Comparative Example 4, the modified kaolin is replaced by an equal amount of kaolin. As can be seen from Table 1, compared with Example 1, the performance of tensile strength, elongation at break, tensile shear strength, abrasion loss and corrosion resistance in Comparative Example 2 and Comparative Example 4 are all worse than those in Example 1, but better than those in Comparative Example 1 and Comparative Example 3, indicating that the modified kaolin and glass fiber in this application have better comprehensive performance, thereby improving the corresponding performance of the cable.

[0096] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A traction cable for an orbit, comprising a transmission line and a sheath covering the outside of the transmission line, characterized in that, By weight, the sheath comprises the following raw materials: 120-130 parts of polyvinyl chloride resin, 20-24 parts of aluminum hydroxide, 4-6 parts of calcium silicate, 1-2 parts of dioctyltin laurate, 27-32 parts of modified glass fiber, 2-3 parts of anti-aging agent, 9-12 parts of polyetherimide, 25-30 parts of modified kaolin, 10-13 parts of talcum powder, 9-14 parts of dolomite, 5-8 parts of magnesium oxide, 2-4 parts of antioxidant, 1-3 parts of silicone lubricant, and 2-4 parts of maleic anhydride grafted AS blend.

2. The traction cable for a track according to claim 1, characterized in that, The preparation method of the modified glass fiber comprises the following steps: (1) Disperse glass fiber in potassium permanganate solution, stir at 65-70 °C for 20-25 min, wash with water, then disperse in titanate coupling agent, filter, and dry to obtain pretreated glass fiber; (2) Disperse modified chitosan in acetic acid solution, add polyester fiber and nano nickel, stir at 90-95 °C for 25-30 min, and dry to obtain pretreated polyester fiber; (3) Disperse the pretreated glass fiber obtained in step (1) in deionized water, add the pretreated polyester fiber obtained in step (2), stir at 90-95 °C for 2-3 h, and dry to obtain modified glass fiber.

3. The traction cable for a track according to claim 2, characterized in that, The mass ratio of the glass fiber, polyester fiber, modified chitosan, and nano nickel is 1:0.5-0.7:0.2-0.3:0.07-0.

09.

4. The traction cable for a track according to claim 2, characterized in that, The preparation method of the modified chitosan comprises the following steps: Add trimethylammonium glycidyl chloride to an aqueous acetic acid solution of chitosan, heat and react for 6-8 h to obtain quaternized chitosan, then disperse in deionized water, add nano silica and xanthan gum, stir at 80-85 °C for 2-3 h, and dry to obtain modified chitosan.

5. A traction cable for a track according to claim 4, characterized in that, The mass ratio of the chitosan, nano silica, and xanthan gum is 1:0.5-0.6:0.1-0.

2.

6. The traction cable for a track according to claim 1, characterized in that, The preparation method of the modified kaolin comprises the following steps: (1) Calcinate kaolin at 800-900 °C for 4-5 h, then disperse in sodium hydroxide solution, stir for 1-2 h, wash with water, and filter to obtain pretreated kaolin; (2) Immerse carbon fiber in a nitric acid solution with a mass fraction of 50-60%, take it out and wash it thoroughly with sodium hydroxide solution and water, then disperse in phenolic resin solution and soak for 20-30 min, and dry to obtain pretreated carbon fiber; (3) Disperse the pretreated kaolin obtained in step (1) in deionized water, add the pretreated carbon fiber obtained in step (2) and modified hydroxyethyl cellulose, stir at 60-65 °C for 1-2 h, and dry to obtain modified kaolin.

7. The traction cable for a track according to claim 6, characterized in that, The mass ratio of the kaolin, carbon fiber, and modified hydroxyethyl cellulose is 1:0.3-0.5:0.2-0.

3.

8. The traction cable for a track according to claim 6, characterized in that, The preparation method of the modified hydroxyethyl cellulose comprises the following steps: Disperse graphene in glycerol, stir evenly, add hydroxyethyl cellulose and dimethyl methylphosphonate, stir at 80-85 °C for 2-3 h, and cool to room temperature to obtain modified hydroxyethyl cellulose.

9. The traction cable for a track according to claim 8, characterized in that, The mass ratio of the hydroxyethyl cellulose, graphene, and dimethyl methylphosphonate is 1 g: 50 - 60 mg: 2 - 3 g.

10. The production process of a traction cable for tracks according to claim 1, characterized in that, It includes the following steps: Mix polyvinyl chloride resin, aluminum hydroxide, calcium silicate, dioctyltin laurate, modified glass fiber, anti-aging agent, polyetherimide, modified kaolin, talc powder, dolomite, magnesium oxide, antioxidant, silicone lubricant, and maleic anhydride grafted AS blend, stir at a temperature of 65 - 70 °C and a speed of 4000 - 4500 r / min for 30 - 35 min to obtain a mixed material, melt extrude, and cure on the outer surface of the transmission line to obtain a traction cable for the track.

Images