A wear-resistant cable and its preparation method

Abstract

This invention relates to the field of cable technology and proposes a wear-resistant cable and its preparation method. The wear-resistant cable comprises, from the inside out, a conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 15-20 parts of filler, and 2-5 parts of additives. The filler is composed of surface-treated silica, calcium carbonate, and molybdenum disulfide in a mass ratio of 1.5-2:3-4:0.3-0.5. The surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica, wherein the surface-treated silica and the second surface-treated silica use different surface-treated agents. This technical solution solves the problem of insufficient wear resistance in related technologies.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a wear-resistant cable and its preparation method. Background Technology

[0002] As fundamental components for power and signal transmission, wires and cables are widely used in industrial manufacturing, rail transportation, mining, new energy, municipal engineering, and other fields. During actual installation and use, cables are often subjected to mechanical forces such as dragging, scraping, reciprocating friction, and compression. Therefore, the wear resistance of the sheath is a key indicator to ensure the stable operation of the cable.

[0003] However, the abrasion resistance of existing wires and cables remains insufficient. Under conditions such as installation in conduits, dragging on the ground, and equipment oscillation, the sheath is easily scratched, thinned, cracked, or even damaged. Once the sheath fails, the internal insulation layer loses its protection and is easily penetrated by moisture, dust, and corrosive media, causing a decline in insulation performance and potentially leading to safety accidents such as leakage, short circuits, and arcing fires, threatening equipment and personal safety. It can also cause problems such as cable core breakage and signal abnormalities, significantly shortening the cable's lifespan. Especially in harsh environments such as mines, fields, and mobile equipment, cable replacement is difficult and costly, and frequent replacements can cause production stoppages and economic losses.

[0004] Therefore, it is very necessary to develop a wear-resistant cable. Summary of the Invention

[0005] This invention proposes a wear-resistant cable and its preparation method, which solves the problem of insufficient wear resistance of cables in related technologies.

[0006] The technical solution of the present invention is as follows: This invention proposes a wear-resistant cable, comprising, from the inside out, a conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 15-20 parts of filler, and 2-5 parts of additives. The filler is composed of surface-treated silica, calcium carbonate, and molybdenum disulfide in a mass ratio of 1.5-2:3-4:0.3-0.5. The surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica, wherein the surface-treated silica and the second surface-treated silica use different surface-treated agents.

[0007] Preferably, the conductor is made of copper.

[0008] Preferably, the insulating layer is a cross-linked polyethylene insulating layer.

[0009] Preferably, the surface treatment agent for the first surface-treated silica is dimethyldichlorosilane, and the surface treatment agent for the second surface-treated silica is γ-aminopropyltriethoxysilane.

[0010] Preferably, the mass ratio of the first surface-treated silica to the second surface-treated silica is 3~4:1.

[0011] Preferably, the thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer, and the Shore A hardness of the thermoplastic polyurethane elastomer is 85~88.

[0012] Preferably, the raw material of the sheath layer further includes 8-12 parts of thermoplastic polyester elastomer.

[0013] Preferably, the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 2 to 3:1, wherein thermoplastic polyester elastomer A is a thermoplastic polyester elastomer filled with polytetrafluoroethylene, and thermoplastic polyester elastomer B is a thermoplastic polyester elastomer filled with glass fiber.

[0014] Preferably, in the thermoplastic polyester elastomer A, the filling amount of polytetrafluoroethylene is 15%, and in the thermoplastic polyester elastomer B, the filling amount of glass fiber is 20%.

[0015] This invention also proposes a method for preparing an abrasion-resistant cable, comprising the following steps: S1. Extruding the insulating layer around the conductor to obtain a semi-finished product; S2. Mix the sheath layer raw materials evenly and extrude them onto the outside of the semi-finished product to obtain the wear-resistant cable.

[0016] The working principle and beneficial effects of this invention are as follows: In this invention, a sheath layer is prepared using thermoplastic polyurethane elastomer as the matrix, combined with fillers and additives, thereby improving the cable's wear resistance. The filler consists of surface-treated silica, calcium carbonate, and molybdenum disulfide. Calcium carbonate enhances the structural density of the matrix and reduces frictional loss; molybdenum disulfide possesses excellent self-lubricating properties, reducing the coefficient of friction on the sheath surface and minimizing wear from reciprocating friction; the two types of silica modified by the surface treatment agent work synergistically, dispersing evenly within the matrix and effectively improving the sheath's scratch resistance. The filler composed of these three substances works together to form a stable wear-resistant reinforcement system, enhancing the cable's wear resistance. Detailed Implementation

[0017] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0018] A specific embodiment of the first aspect of the present invention provides a wear-resistant cable, comprising, from the inside out, a conductor, an insulation layer, and a sheath layer. The sheath layer comprises the following raw materials in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 15-20 parts of filler, and 2-5 parts of additives. The filler is composed of surface-treated silica, calcium carbonate, and molybdenum disulfide in a mass ratio of 1.5-2:3-4:0.3-0.5. The surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica, wherein the surface-treated silica and the second surface-treated silica have different surface-treated agents.

[0019] In this invention, the additives consist of an antioxidant, an ultraviolet absorber, and a lubricant in a mass ratio of 0.5~1:0.5~1:2~4; the antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076, preferably antioxidant 1010; the ultraviolet absorber includes one or two of UV-326 and UV-327, preferably UV-326; the lubricant can be one or two of zinc stearate and calcium stearate, preferably zinc stearate.

[0020] In this invention, antioxidants can inhibit the oxidative degradation of thermoplastic polyurethane matrix under high temperature and oxygen environment, delay material aging, hardening, and cracking, and maintain the mechanical and wear-resistant properties of the sheath for a long time; UV absorbers can absorb external ultraviolet rays, prevent the polymer chain from being damaged by ultraviolet light, and prevent the sheath from fading, powdering, and cracking; lubricants can improve the compatibility of each component and the flowability of materials, reduce frictional resistance during processing, prevent filler agglomeration, and at the same time improve the smoothness of the sheath surface, thus helping to reduce wear.

[0021] In one embodiment of the present invention, the conductor is made of copper.

[0022] In one embodiment of the present invention, the insulating layer is a cross-linked polyethylene insulating layer.

[0023] In one embodiment of the present invention, the surface treatment agent for the first surface-treated silica is dimethyldichlorosilane, and the surface treatment agent for the second surface-treated silica is γ-aminopropyltriethoxysilane.

[0024] In this invention, the surface treatment agent for the first surface-treated silica is dimethyldichlorosilane. The silica surface changes from hydrophilic to hydrophobic, which greatly improves its compatibility with the thermoplastic polyurethane matrix. It can be uniformly dispersed in the matrix, effectively filling the gaps between molecules, improving the density and surface hardness of the sheath layer, enhancing its scratch and wear resistance, and reducing material shedding during friction. The surface treatment agent for the second surface-treated silica is γ-aminopropyltriethoxysilane. This silane coupling agent enhances the interfacial bonding strength between the inorganic filler and the organic matrix, improving the overall mechanical stability. The use of the two types of silica balances dispersion and interfacial bonding strength, synergistically improving the wear resistance of the cable.

[0025] In one embodiment of the present invention, the mass ratio of the first surface-treated silicon dioxide to the second surface-treated silicon dioxide is 3 to 4:1.

[0026] In this invention, the mass ratio of the first surface-treated silica to the second surface-treated silica is 3-4:1. Hydrophobically modified silica is the primary component, supplemented by coupling agent-modified silica. Sufficient first silica plays a crucial role in filling, hardening, and reducing wear, while an appropriate amount of second silica strengthens interfacial bonding and optimizes overall dispersion. The balanced ratio of the two components results in stable and improved overall wear resistance of the sheath. If the second silica content is insufficient, the interfacial bonding between the filler and the matrix weakens, leading to filler debonding and localized interfacial peeling. This can cause microcracks during friction, accelerating wear. Conversely, if the amount of first silica is too small, the overall filling and reinforcing effect decreases, resulting in insufficient wear resistance.

[0027] In one embodiment of the present invention, the thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer, and the Shore A hardness of the thermoplastic polyurethane elastomer is 85~88.

[0028] In this invention, the polyester-type thermoplastic polyurethane elastomer has strong molecular chain polarity and high cohesive energy, possessing excellent wear resistance. Compared to polyether-type elastomers, the polyester-type thermoplastic polyurethane elastomer exhibits superior resistance to friction loss and better compatibility with compounded inorganic fillers and molybdenum disulfide lubrication systems, further amplifying the overall wear resistance effect. Furthermore, its Shore A hardness is 85-88. This range avoids the problems of insufficient hardness leading to a soft matrix material, inadequate resistance to scratches from hard objects, and easy plastic deformation during friction, while also avoiding the problems of excessive hardness leading to excessive matrix rigidity, significantly reduced flexibility, and increased impact stress when the hard matrix contacts the friction surface, thus increasing wear.

[0029] In one embodiment of the present invention, the raw material of the sheath layer further includes 8-12 parts of thermoplastic polyester elastomer.

[0030] In this invention, a thermoplastic polyester elastomer is added to the cable sheath layer, which can form a blend system with a polyester-type thermoplastic polyurethane elastomer to further optimize wear resistance. Specifically, the thermoplastic polyester elastomer and the polyester-type thermoplastic polyurethane elastomer have excellent compatibility, which can improve the overall resilience and deformation resistance of the material and reduce material loss caused by plastic deformation; at the same time, it improves the surface feel and smoothness of the material, reduces dynamic frictional resistance, and, combined with the lubricating effect of molybdenum disulfide in the system, further reduces wear caused by reciprocating friction.

[0031] In one embodiment of the present invention, the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 2 to 3:1, wherein thermoplastic polyester elastomer A is a thermoplastic polyester elastomer filled with polytetrafluoroethylene and thermoplastic polyester elastomer B is a thermoplastic polyester elastomer filled with glass fiber.

[0032] In this invention, thermoplastic polyester elastomer A is filled with polytetrafluoroethylene (PTFE), which has an extremely low coefficient of surface friction and can form a stable lubricating transition layer on the sheath surface. Combined with the self-lubricating effect of molybdenum disulfide in the system, it further reduces the dynamic frictional resistance between the sheath and the external contact surface. Thermoplastic polyester elastomer B is filled with glass fiber, which can improve rigidity and resist deformation and surface damage caused by scratching and rolling of hard objects. The mass ratio of the two is 2~3:1, with the lubricated modified elastomer A as the main component and the rigidity-enhancing elastomer B as the auxiliary component. This ensures that the sheath has excellent self-lubricating and friction-reducing effects, avoiding excessive frictional loss, and also improves the overall structural rigidity and scratch resistance through an appropriate amount of glass fiber skeleton. At the same time, this ratio can effectively avoid the problems of material hardness, reduced flexibility, and easy cracking and powdering caused by excessive glass fiber content, and also avoid the defects of insufficient matrix support strength and weak scratch resistance caused by excessive polytetrafluoroethylene elastomer content, effectively improving the wear resistance of the cable.

[0033] In one embodiment of the present invention, the amount of polytetrafluoroethylene in thermoplastic polyester elastomer A is 15%, and the amount of glass fiber in thermoplastic polyester elastomer B is 20%.

[0034] In this invention, the polytetrafluoroethylene (PTFE) filling amount in thermoplastic polyester elastomer A is controlled at 15%. This filling ratio allows PTFE to be uniformly dispersed in the polyester elastomer matrix, fully utilizing the low coefficient of friction characteristic of PTFE, continuously improving the material's self-lubricating ability, and effectively reducing the dynamic friction loss of the sheath. If the filling amount is too low, the lubricating component is insufficient, and the friction reduction effect is difficult to fully realize; if the filling amount is too high, PTFE is prone to agglomeration, disrupting the continuity of the matrix, and also reducing the material's mechanical strength and interfacial bonding force, thus exacerbating wear. The glass fiber filling amount in thermoplastic polyester elastomer B is set at 20%. The glass fiber can form a uniformly distributed reinforcing skeleton in the matrix, significantly improving the material's hardness, shear resistance, and scratch resistance, and strengthening the overall structural stability. When the filling amount is less than 20%, the reinforcing skeleton is sparse, the reinforcement effect is limited, and it is difficult to resist deformation and damage caused by external extrusion and abrasion; when the filling amount is more than 20%, the glass fiber is prone to agglomeration, causing a significant decrease in the material's toughness. When the sheath is bent or twisted, cracks and chips are easily generated, which in turn damages the wear-resistant structure.

[0035] In this invention, calcium carbonate and molybdenum disulfide require coupling agent modification before addition. The coupling agent is γ-aminopropyltriethoxysilane. The specific method is as follows: γ-aminopropyltriethoxysilane is dispersed in a solvent, calcium carbonate and molybdenum disulfide are added, mixed for 2 hours, and then dried. The solvent consists of anhydrous ethanol and water in a mass ratio of 9:1. The mass ratio of the sum of calcium carbonate and molybdenum disulfide to the solvent is 1:5, and the mass ratio of the sum of calcium carbonate and molybdenum disulfide to γ-aminopropyltriethoxysilane is 25:2.

[0036] A specific embodiment of the second aspect of the present invention provides a method for preparing a wear-resistant cable, comprising the following steps: S1. Extruding the insulating layer around the conductor to obtain a semi-finished product; S2. Mix the sheathing material evenly and extrude it onto the outside of the semi-finished product to obtain abrasion-resistant cable.

[0037] Unless otherwise specified, the following embodiments and comparative examples are as follows: Thermoplastic polyurethane elastomer: Polyester-type thermoplastic polyurethane elastomer with a Shore A hardness of 85 and a model number of TPU385AE; First surface treatment silica: The surface treatment agent is dimethyldichlorosilane with an average particle size of 15nm, model ZC-SIO2-N15, from Zhejiang Chongchuan New Material Technology Co., Ltd. The second surface treatment silica: The surface treatment agent is γ-aminopropyltriethoxysilane with an average particle size of 20nm, model ZC-SIO2-N22, from Zhejiang Chongchuan New Material Technology Co., Ltd. Calcium carbonate: average particle size is 800 mesh; Molybdenum disulfide: average particle size is 800 mesh; Thermoplastic polyester elastomer A: The filler content of polytetrafluoroethylene is 15%, and the model is TPEE YL003C (YL-4030CCS). Thermoplastic polyester elastomer B: glass fiber filler content is 20%, model is PEE YF004 (YF-1004).

[0038] Example 1 The sheath layer comprises the following raw materials in parts by weight: 100 parts thermoplastic polyurethane elastomer, 15 parts filler, and 2 parts additives; the filler consists of surface-treated silica, calcium carbonate, and molybdenum disulfide in a ratio of 1.5:3:0.3. Calcium carbonate and molybdenum disulfide require coupling agent modification before addition. The coupling agent is γ-aminopropyltriethoxysilane. The specific method is as follows: disperse γ-aminopropyltriethoxysilane in a solvent, add calcium carbonate and molybdenum disulfide, mix for 2 hours, and then dry. The solvent consists of anhydrous ethanol and water in a mass ratio of 9:1. The mass ratio of the sum of calcium carbonate and molybdenum disulfide to the solvent is 1:5, and the mass ratio of the sum of calcium carbonate and molybdenum disulfide to γ-aminopropyltriethoxysilane is 25:2. The surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica in a mass ratio of 3:1. The additives consist of antioxidant 1010, ultraviolet absorber UV-326, and zinc stearate in a mass ratio of 0.5:0.5:2. A method for preparing an abrasion-resistant cable includes the following steps: S1. Extruding the cross-linked polyethylene insulation layer around the copper conductor yields a semi-finished product; S2. Mix the sheathing material evenly and extrude it onto the outside of the semi-finished product to obtain abrasion-resistant cable.

[0039] Example 2 The sheath layer comprises the following raw materials in parts by weight: 100 parts thermoplastic polyurethane elastomer, 18 parts filler, and 4 parts additives; the filler consists of surface-treated silica, calcium carbonate, and molybdenum disulfide in a ratio of 1.8:3.5:0.4. Calcium carbonate and molybdenum disulfide require coupling agent modification before addition. The coupling agent is γ-aminopropyltriethoxysilane. The specific method is as follows: disperse γ-aminopropyltriethoxysilane in a solvent, add calcium carbonate and molybdenum disulfide, mix for 2 hours, and then dry. The solvent consists of anhydrous ethanol and water in a mass ratio of 9:1. The mass ratio of the sum of calcium carbonate and molybdenum disulfide to the solvent is 1:5, and the mass ratio of the sum of calcium carbonate and molybdenum disulfide to γ-aminopropyltriethoxysilane is 25:2. The surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica in a mass ratio of 3:1. The additives consist of antioxidant 1010, ultraviolet absorber UV-326, and zinc stearate in a mass ratio of 0.8:0.8:3. A method for preparing an abrasion-resistant cable includes the following steps: S1. Extruding the cross-linked polyethylene insulation layer around the copper conductor yields a semi-finished product; S2. Mix the sheathing material evenly and extrude it onto the outside of the semi-finished product to obtain abrasion-resistant cable.

[0040] Example 3 The sheath layer comprises the following raw materials in parts by weight: 100 parts thermoplastic polyurethane elastomer, 20 parts filler, and 5 parts additives; the filler consists of surface-treated silica, calcium carbonate, and molybdenum disulfide in a 2:4:0.5 ratio. Calcium carbonate and molybdenum disulfide require coupling agent modification before addition. The coupling agent is γ-aminopropyltriethoxysilane. The specific method is as follows: disperse γ-aminopropyltriethoxysilane in a solvent, add calcium carbonate and molybdenum disulfide, mix for 2 hours, and then dry. The solvent consists of anhydrous ethanol and water in a 9:1 mass ratio. The mass ratio of the sum of calcium carbonate and molybdenum disulfide to the solvent is 1:5, and the mass ratio of the sum of calcium carbonate and molybdenum disulfide to γ-aminopropyltriethoxysilane is 25:2. The surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica in a mass ratio of 3:1. The additives consist of antioxidant 1010, ultraviolet absorber UV-326, and zinc stearate in a mass ratio of 1:1:4; A method for preparing an abrasion-resistant cable includes the following steps: S1. Extruding the cross-linked polyethylene insulation layer around the copper conductor yields a semi-finished product; S2. Mix the sheathing material evenly and extrude it onto the outside of the semi-finished product to obtain abrasion-resistant cable.

[0041] Example 4 The difference between Example 4 and Example 2 is that the surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica in a mass ratio of 4:1.

[0042] Example 5 Compared with Example 4, Example 5 differs in that the thermoplastic polyurethane elastomer (polyester-type thermoplastic polyurethane elastomer with Shore A hardness of 85, model TPU 385AE) is replaced with an equal amount of thermoplastic polyurethane elastomer, polyester-type thermoplastic polyurethane elastomer with Shore A hardness of 88, model TPU 288ALM.

[0043] Example 6 Compared with Example 4, Example 6 differs in that the thermoplastic polyurethane elastomer (polyester-type thermoplastic polyurethane elastomer with Shore A hardness of 85 and model number TPU 385AE) is replaced with an equal amount of thermoplastic polyurethane elastomer, polyester-type thermoplastic polyurethane elastomer with Shore A hardness of 95 and model number TPU 250DE.

[0044] Example 7 Compared with Example 4, Example 7 differs in that the thermoplastic polyurethane elastomer (polyester-type thermoplastic polyurethane elastomer with Shore A hardness of 85 and model number TPU 385AE) is replaced with an equal amount of thermoplastic polyurethane elastomer, polyester-type thermoplastic polyurethane elastomer with Shore A hardness of 60 and model number TPU 260DE.

[0045] Example 8 Compared with Example 4, Example 8 differs in that the sheath layer comprises the following raw materials in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 18 parts of filler, 4 parts of additives, and 8 parts of thermoplastic polyester elastomer, wherein the thermoplastic polyester elastomer is thermoplastic polyester elastomer A, and the thermoplastic polyurethane elastomer, filler, and additives are the same as in Example 4.

[0046] Example 9 The difference between Example 9 and Example 8 is that the amount of thermoplastic polyester elastomer added is 12 parts.

[0047] Example 10 The difference between Example 10 and Example 9 is that the thermoplastic polyester elastomer is thermoplastic polyester elastomer B.

[0048] Example 11 The difference between Example 11 and Example 10 is that the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 2:1.

[0049] Example 12 The difference between Example 12 and Example 10 is that the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 3:1.

[0050] Example 13 The difference between Example 13 and Example 10 is that the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 1:1.

[0051] Example 14 The difference between Example 14 and Example 10 is that the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 4:1.

[0052] Example 15 Compared with Example 12, Example 15 differs in that the thermoplastic polyester elastomer B with a glass fiber filling amount of 20% and a model number of PEE YF004 (YF-1004) is replaced with an equal amount of thermoplastic polyester elastomer B with a glass fiber filling amount of 15% and a model number of PEE YF003S (YF-1003 HS).

[0053] Example 16 Compared with Example 12, Example 16 differs in that the thermoplastic polyester elastomer B with a glass fiber filling amount of 20% and a model number of PEE YF004 (YF-1004) is replaced with an equal amount of thermoplastic polyester elastomer B with a glass fiber filling amount of 30% and a model number of PEE YF006A (YF-1006).

[0054] Example 17 Compared with Example 2, Example 17 differs in that the second surface-treated silica, with γ-aminopropyltriethoxysilane as the surface treatment agent, having an average particle size of 20 nm and a model number of ZC-SiO2-N22, is replaced with an equal amount of surface-treated silica, with γ-methacryloyloxypropyltrimethoxysilane as the surface treatment agent, having an average particle size of 20 nm and a model number of ZC-SiO2-N21.

[0055] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that the surface-treated silica is a first surface-treated silica.

[0056] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the surface-treated silicon dioxide is a second surface-treated silicon dioxide.

[0057] Experimental Example 1 The sheathing layers of the wear-resistant cables prepared in Examples 1-17 and Comparative Examples 1-2 are conforming to GB / T 3960. The test method specified in the 2016 "Test Method for Sliding Friction and Wear of Plastics" is used to test the wear resistance of materials.

[0058] The test results are shown in Table 1: Table 1 Performance test results of Examples 1-17 and Comparative Examples 1-2

[0059] As shown in Table 1, when the surface-treated silica in the filler is composed of first-surface-treated silica and second-surface-treated silica with different surface-treatment agents, the wear resistance of the cable can be improved; when thermoplastic polyester elastomer is added to the sheath layer, the wear resistance of the cable can be further improved; when the thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B with different fillers, the wear resistance of the resulting cable is even better.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wear-resistant cable, comprising, from the inside out, a conductor, an insulation layer, and a sheath layer, characterized in that, The sheath layer comprises the following raw materials in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 15-20 parts of filler, and 2-5 parts of additives; the filler is composed of surface-treated silica, calcium carbonate, and molybdenum disulfide in a mass ratio of 1.5-2:3-4:0.3-0.5; the surface-treated silica is composed of a first surface-treated silica and a second surface-treated silica, wherein the surface-treated silica and the second surface-treated silica have different surface-treated agents.

2. The wear-resistant cable according to claim 1, characterized in that, The conductor is made of copper.

3. The wear-resistant cable according to claim 1, characterized in that, The insulation layer is a cross-linked polyethylene insulation layer.

4. The wear-resistant cable according to claim 1, characterized in that, The surface treatment agent for the first surface-treated silica is dimethyldichlorosilane, and the surface treatment agent for the second surface-treated silica is γ-aminopropyltriethoxysilane.

5. The wear-resistant cable according to claim 4, characterized in that, The mass ratio of the first surface-treated silica to the second surface-treated silica is 3~4:

1.

6. The wear-resistant cable according to claim 1, characterized in that, The thermoplastic polyurethane elastomer is a polyester-type thermoplastic polyurethane elastomer, and the Shore A hardness of the thermoplastic polyurethane elastomer is 85~88.

7. The wear-resistant cable according to claim 1, characterized in that, The raw material for the sheath layer also includes 8-12 parts of thermoplastic polyester elastomer.

8. The wear-resistant cable according to claim 7, characterized in that, The thermoplastic polyester elastomer is composed of thermoplastic polyester elastomer A and thermoplastic polyester elastomer B in a mass ratio of 2~3:

1. The thermoplastic polyester elastomer A is a thermoplastic polyester elastomer filled with polytetrafluoroethylene, and the thermoplastic polyester elastomer B is a thermoplastic polyester elastomer filled with glass fiber.

9. The wear-resistant cable according to claim 8, characterized in that, In the thermoplastic polyester elastomer A, the filling amount of polytetrafluoroethylene is 15%, and in the thermoplastic polyester elastomer B, the filling amount of glass fiber is 20%.

10. A method for preparing an abrasion-resistant cable, used to prepare the abrasion-resistant cable according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Extruding the insulating layer around the conductor to obtain a semi-finished product; S2. Mix the sheath layer raw materials evenly and extrude them onto the outside of the semi-finished product to obtain the wear-resistant cable.

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