A highly wear-resistant and bending-resistant power cable and its preparation method

Abstract

The present invention relates to the technical field of power cables, and proposes a highly wear-resistant and anti-bending power cable and a preparation method thereof. A highly wear-resistant and anti-bending power cable comprises, from the outside to the inside, a sheath layer, an insulating layer, and a conductor. The sheath layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 10 to 15 parts of high-density polyethylene, 4 to 8 parts of methyl methacrylate-butadiene-styrene copolymer, 15 to 20 parts of composite wood fiber, 0.5 to 1.5 parts of antioxidant, and 2 to 3 parts of plasticizer; the raw materials of the composite wood fiber include wood fiber powder and spherical yttrium oxide in a weight ratio of 5 to 19:1; the raw materials of the composite wood fiber also include vinyl pyrrolidone-vinyl acetate copolymer. Through the above technical solution, the problem of poor wear resistance of the power cable sheath layer in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a highly wear-resistant and bending-resistant power cable and a preparation method thereof. Background Art

[0002] As an important carrier of electrical energy transmission, power cables are widely used in power systems, industrial equipment, building facilities, rail transportation and other fields. With the continuous growth of electricity demand and the increasingly complex application environment, cables are often subjected to external forces such as mechanical stress, bending, and friction during installation and operation, which places higher demands on the performance of power cables.

[0003] Traditional power cables mostly use polyvinyl chloride and polyethylene as the basic materials for the insulation and sheath layers. Although they have certain mechanical strength and electrical properties, the cable surface is easily damaged by wear and tear in long-term harsh environments, shortening the service life and even causing safety hazards such as short circuits and leakage.

[0004] At present, in order to improve the wear resistance of the cable sheath layer, the method of increasing the sheath layer thickness or adding wear-resistant fillers (such as carbon black, silica, etc.) is usually adopted. However, this method will reduce the flexibility of the cable. At the same time, the large amount of wear-resistant fillers added will easily lead to excessive differences in the local performance of the cable sheath layer, which will in turn limit the improvement of the wear resistance of the cable sheath layer.

[0005] Therefore, developing a power cable that does not require a large amount of wear-resistant fillers but can significantly improve the wear resistance of the power cable sheath layer is of extremely important practical significance for ensuring the long-term stable operation of the power cable under complex working conditions. Summary of the Invention

[0006] The present invention provides a highly wear-resistant and bending-resistant power cable and a preparation method thereof, which solves the problem of poor wear resistance of the power cable sheath layer in the related art.

[0007] The technical solutions of the present invention are as follows:

[0008] The present invention provides a highly wear-resistant and bending-resistant power cable, which comprises, from the outside to the inside, a sheath layer, an insulation layer and a conductor, wherein the sheath layer comprises the following components in parts by weight:

[0009] 100 parts of polyvinyl chloride, 10-15 parts of high-density polyethylene, 4-8 parts of methyl methacrylate-butadiene-styrene copolymer, 15-20 parts of composite wood fiber, 0.5-1.5 parts of antioxidant, 2-3 parts of plasticizer;

[0010] The raw materials of the composite wood fiber include wood fiber powder and spherical yttrium oxide in a weight ratio of 5 to 19:1;

[0011] The raw material of the composite wood fiber also includes vinyl pyrrolidone-vinyl acetate copolymer.

[0012] As a further technical solution, the weight ratio of the wood fiber powder to the spherical yttrium oxide is 9 to 17:1, for example, it can be 9:1, 10:1, 11:1, 12:1, 14:1, 16:1, 17:1, preferably 9:1, 17:1.

[0013] In the present invention, when the weight ratio of wood fiber powder to spherical yttrium oxide is 9-17:1, the wear resistance of the power cable sheath layer can be further improved, so that the wear mass of the power cable sheath layer is reduced to 0.087-0.092g.

[0014] As a further technical solution, the method for preparing the composite wood fiber comprises the following steps:

[0015] B1. Add spherical yttrium oxide into anhydrous ethanol and disperse evenly to obtain mixed solution I;

[0016] B2. Add silane coupling agent I and surfactant I to anhydrous ethanol and mix well to obtain a mixed solution II;

[0017] B3, adding the mixed solution II to the mixed solution I, dispersing evenly, concentrating, and drying to obtain pretreated spherical yttrium oxide;

[0018] B4. Add the pretreated spherical yttrium oxide, the vinyl pyrrolidone-vinyl acetate copolymer, silane coupling agent II, and surfactant II into acetone, disperse them evenly, then add the wood fiber powder, mix them evenly, concentrate, and dry to obtain composite wood fiber.

[0019] As a further technical solution, the silane coupling agent I and the silane coupling agent II are each independently γ-mercaptopropyltrimethoxysilane;

[0020] The surfactant I and surfactant II are each independently oleic acid diethanolamide.

[0021] As a further technical solution, the weight ratio of the spherical yttrium oxide, the silane coupling agent I and the surfactant I is 1:0.1~0.3:0.05~0.08, for example, it can be 1:0.1:0.05, 1:0.2:0.05, 1:0.3:0.05, 1:0.2:0.06, 1:0.2:0.08, 1:0.3:0.07, 1:0.3:0.08, preferably 1:0.1:0.05, 1:0.3:0.08, and more preferably 1:0.3:0.08;

[0022] The weight ratio of the wood fiber powder, silane coupling agent II and surfactant II is 10:1~1.3:0.6~0.8, for example, it can be 10:1:0.6, 10:1.2:0.6, 10:1.3:0.6, 10:1:0.7, 10:1.2:0.7, 10:1.3:0.8, preferably 10:1:0.6, 10:1.3:0.8, and more preferably 10:1.3:0.8.

[0023] In the present invention, silane coupling agent I and silane coupling agent II are both commonly used silane coupling agents in the art, for example, they can be independently selected from one or more of γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, and 3-(methacryloyloxy)propyltrimethoxysilane, preferably γ-mercaptopropyltrimethoxysilane;

[0024] Surfactant I and Surfactant II are both commonly used nonionic surfactants in the art, for example, they can be independently one or more of oleic acid diethanolamide, coconut oil fatty acid diethanolamide, lauric acid diethanolamide, fatty alcohol polyoxyethylene ether, preferably oleic acid diethanolamide;

[0025] The addition of silane coupling agent I can initially organize the surface of spherical yttrium oxide, laying the foundation for the subsequent composite of spherical yttrium oxide and wood fiber powder. Surfactant I can reduce the surface tension of the solution to a certain extent, improve the wettability and dispersibility of mixed solution II, and thus help silane coupling agent I to better exert its effect on the surface of spherical yttrium oxide. The preliminary treatment of spherical yttrium oxide by silane coupling agent I and surfactant I, and the reasonable control of the weight ratio of spherical yttrium oxide, silane coupling agent I and surfactant I can improve the success rate of the subsequent composite of spherical yttrium oxide and wood fiber powder.

[0026] In step B4, when the silane coupling agent II, surfactant II and pretreated spherical yttrium oxide are fully mixed, the silane coupling agent and surfactant are used to perform secondary treatment on the spherical yttrium oxide. The spherical yttrium oxide after the secondary treatment can be better combined with the wood fiber powder, thereby achieving successful composite of the spherical yttrium oxide and the wood fiber powder, thereby obtaining composite wood fiber.

[0027] As a further technical solution, in step B1, when the dispersion is uniform, stirring is performed at 200-400 rpm for 10-20 minutes.

[0028] As a further technical solution, in step B3, when the dispersion is uniform, stirring is performed at 200-400 rpm and 50-60° C. for 30-40 minutes.

[0029] As a further technical solution, in step B4, when the dispersion is uniform, stirring is performed at 500-600 rpm for 40-60 min.

[0030] As a further technical solution, the weight ratio of the spherical yttrium oxide and the vinyl pyrrolidone-vinyl acetate copolymer to the wood fiber powder is 1:9;

[0031] The weight ratio of the spherical yttrium oxide to the vinyl pyrrolidone-vinyl acetate copolymer is 1-3:1.

[0032] In the present invention, spherical yttrium oxide and wood fiber powder are used for composite treatment. Although the obtained composite wood fiber can improve the wear resistance of the power cable sheath layer, the dispersibility of the composite wood fiber in the matrix material is limited and it is easy to agglomerate, which affects the tensile properties of the power cable sheath layer. When the raw material of the composite wood fiber also includes vinyl pyrrolidone-vinyl acetate copolymer, the vinyl pyrrolidone-vinyl acetate copolymer and spherical yttrium oxide are used to composite the wood fiber powder. While ensuring the wear resistance of the power cable sheath layer, the tensile properties of the power cable sheath layer can also be improved. By reasonably adjusting the ratio between the spherical yttrium oxide, the vinyl pyrrolidone-vinyl acetate copolymer and the wood fiber powder, when the weight ratio of the sum of the spherical yttrium oxide and the vinyl pyrrolidone-vinyl acetate copolymer to the wood fiber powder is 1:9, and the weight ratio of the spherical yttrium oxide to the vinyl pyrrolidone-vinyl acetate copolymer is 1-3:1, the effect of improving the tensile properties of the power cable sheath layer can be optimized.

[0033] As a further technical solution, the antioxidant includes one or more of antioxidant 1010 , antioxidant 300 , and antioxidant 626 .

[0034] As a further technical solution, the plasticizer includes one or both of dibutyl phthalate and dioctyl sebacate.

[0035] In the present invention, an antioxidant is added to the power cable sheath layer, which can slow down the oxidative degradation of the organic matrix material by capturing free radicals, thereby improving the stability of the sheath layer material during processing and use. The antioxidant includes one or more of antioxidant 1010, antioxidant 300, and antioxidant 626, preferably antioxidant 1010.

[0036] The plasticizer is mainly used to weaken the interaction between the molecular chains of the organic substrate of the sheath layer, making it easier to process and extrude, and reducing processing energy consumption. The plasticizer includes one or two of dibutyl phthalate and dioctyl sebacate, preferably dibutyl phthalate.

[0037] As a further technical solution, the conductor is made of a copper alloy or an aluminum alloy;

[0038] The insulating layer is a polyvinyl chloride insulating layer.

[0039] The present invention provides a method for preparing a highly wear-resistant and bend-resistant power cable, which comprises the following steps:

[0040] S1. Extruding and coating the insulating layer on the periphery of the conductor to form a semi-finished cable;

[0041] S2. After blending the components of the sheath layer, the sheath layer is extruded and coated on the surface of the semi-finished cable to obtain the highly wear-resistant and bending-resistant power cable.

[0042] The working principle and beneficial effects of the present invention are:

[0043] 1. In the present invention, the sheath layer of the power cable uses polyvinyl chloride as the base material, which provides the sheath layer with basic mechanical properties. In addition, by adding high-density polyethylene, methyl methacrylate-butadiene-styrene copolymer, composite wood fiber, antioxidant and plasticizer into the sheath layer, the synergistic effect of multiple component raw materials is obtained to obtain a power cable sheath layer with excellent wear resistance, thereby meeting the higher requirements of the wear resistance of the power cable.

[0044] 2. Polyvinyl chloride gives the sheath layer basic mechanical properties, but polyvinyl chloride itself is relatively brittle. The introduction of high-density polyethylene, which works together with polyvinyl chloride, can improve the resilience of the power cable sheath layer to a certain extent, so that the power cable can return to its original shape after bending and reduce deformation; methyl methacrylate-butadiene-styrene copolymer is a core-shell structure elastomer, in which the butadiene segment can improve the flexibility of the power cable, and the methyl methacrylate and styrene segments can provide rigidity to the power cable to a certain extent. When rigidity and flexibility coexist, when the power cable is subjected to external friction, the presence of methyl methacrylate-butadiene-styrene copolymer in the sheath layer enables the power cable to resist the external stress caused by friction and reduce the expansion of surface cracks, thereby reducing the degree of wear of the power cable sheath layer.

[0045] 3. Composite wood fiber is introduced into the sheath layer of the power cable. The composite wood fiber is composed of wood fiber powder and spherical yttrium oxide in a weight ratio of 5 to 19:1. The wood fiber powder and spherical yttrium oxide have a synergistic effect. When the composite wood fiber formed by the two is added to the sheath layer, it can have a good interface effect with the matrix material and can better transfer stress, thereby effectively improving the wear resistance of the power cable sheath layer. DETAILED DESCRIPTION

[0046] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0047] In the following embodiments and comparative examples, the model of polyvinyl chloride is NI00-50; the model of high-density polyethylene is DMDA-8008H; the model of methyl methacrylate-butadiene-styrene copolymer is TH-21B; the particle size of wood fiber powder is 75 μm; the particle size of spherical yttrium oxide is 10 μm; vinyl pyrrolidone-vinyl acetate copolymer, CAS No. 25086-89-9, is purchased from Wuhan Chengtian Fine Chemical Co., Ltd.; the material of the conductor is copper alloy, model MF202.

[0048] Example 1

[0049] The preparation method of the composite wood fiber comprises the following steps:

[0050] A1. Add 2.5 parts of spherical yttrium oxide to 25 parts of anhydrous ethanol and stir at 200 rpm for 20 minutes to disperse evenly to obtain a mixed solution I.

[0051] A2. Add 0.25 parts of γ-mercaptopropyltrimethoxysilane and 0.125 parts of oleic acid diethanolamide to 5 parts of anhydrous ethanol and mix well to obtain a mixed solution II.

[0052] A3, adding mixed solution II to mixed solution I, stirring at 200 rpm for 40 min at 50°C to uniformly disperse, concentrating, and drying to obtain pretreated spherical yttrium oxide;

[0053] A4. The pretreated spherical yttrium oxide, 1.25 parts of γ-mercaptopropyltrimethoxysilane, and 0.75 parts of oleic acid diethanolamide were added to 25 parts of acetone and stirred at 500 rpm for 60 minutes. After uniform dispersion, 12.5 parts of wood fiber powder were added, mixed evenly, concentrated, and dried to obtain a composite wood fiber.

[0054] A highly wear-resistant and bending-resistant power cable comprises the following steps:

[0055] S1. Extruding and coating a polyvinyl chloride insulation layer on the outer periphery of the copper alloy conductor to form a semi-finished cable;

[0056] S2. 100 parts of polyvinyl chloride, 10 parts of high-density polyethylene, 4 parts of methyl methacrylate-butadiene-styrene copolymer, 15 parts of the above-mentioned composite wood fiber, 0.5 parts of antioxidant 1010, and 2 parts of dibutyl phthalate in the sheath layer are blended, and then extruded and coated on the surface of the cable semi-finished product to obtain a highly wear-resistant and bending-resistant power cable.

[0057] Example 2

[0058] The preparation method of the composite wood fiber comprises the following steps:

[0059] A1. Add 3 parts of spherical yttrium oxide to 25 parts of anhydrous ethanol and stir at 300 rpm for 15 minutes to disperse evenly to obtain mixed solution I.

[0060] A2. Add 0.9 parts of γ-mercaptopropyltrimethoxysilane and 0.24 parts of oleic acid diethanolamide to 5 parts of anhydrous ethanol, mix well, and obtain a mixed solution II.

[0061] A3. Add the mixed solution II to the mixed solution I, stir at 300 rpm for 30 min at 60°C to disperse evenly, concentrate, and dry to obtain pretreated spherical yttrium oxide;

[0062] A4. The pretreated spherical yttrium oxide, 1.95 parts of γ-mercaptopropyltrimethoxysilane, and 1.2 parts of oleic acid diethanolamide were added to 25 parts of acetone and stirred at 550 rpm for 50 minutes. After uniform dispersion, 15 parts of wood fiber powder were added, mixed evenly, concentrated, and dried to obtain a composite wood fiber.

[0063] A highly wear-resistant and bending-resistant power cable comprises the following steps:

[0064] S1. Extruding and coating a polyvinyl chloride insulation layer on the outer periphery of the copper alloy conductor to form a semi-finished cable;

[0065] S2. 100 parts of polyvinyl chloride, 13 parts of high-density polyethylene, 6 parts of methyl methacrylate-butadiene-styrene copolymer, 18 parts of the above-mentioned composite wood fiber, 1 part of antioxidant 1010, and 2.5 parts of dibutyl phthalate in the sheath layer are blended, and then extruded and coated on the surface of the cable semi-finished product to obtain a highly wear-resistant and bending-resistant power cable.

[0066] Example 3

[0067] The preparation method of the composite wood fiber comprises the following steps:

[0068] A1. Add 1 part of spherical yttrium oxide to 25 parts of anhydrous ethanol and stir at 400 rpm for 10 minutes to disperse evenly to obtain mixed solution I.

[0069] A2. Add 0.3 parts of γ-mercaptopropyltrimethoxysilane and 0.08 parts of oleic acid diethanolamide to 5 parts of anhydrous ethanol and mix well to obtain a mixed solution II.

[0070] A3. Add the mixed solution II to the mixed solution I, stir at 400 rpm for 30 min at 60°C to disperse evenly, concentrate, and dry to obtain pretreated spherical yttrium oxide;

[0071] A4. The pretreated spherical yttrium oxide, 2.47 parts of γ-mercaptopropyltrimethoxysilane, and 1.52 parts of oleic acid diethanolamide were added to 25 parts of acetone and stirred at 600 rpm for 40 minutes. After uniform dispersion, 19 parts of wood fiber powder were added, mixed evenly, concentrated, and dried to obtain a composite wood fiber.

[0072] A highly wear-resistant and bending-resistant power cable comprises the following steps:

[0073] S1. Extruding and coating a polyvinyl chloride insulation layer on the outer periphery of the copper alloy conductor to form a semi-finished cable;

[0074] S2. 100 parts of polyvinyl chloride, 15 parts of high-density polyethylene, 8 parts of methyl methacrylate-butadiene-styrene copolymer, 20 parts of the above-mentioned composite wood fiber, 1.5 parts of antioxidant 1010, and 3 parts of dibutyl phthalate in the sheath layer are blended, and then extruded and coated on the surface of the cable semi-finished product to obtain a highly wear-resistant and bending-resistant power cable.

[0075] Example 4

[0076] The only difference between this embodiment and embodiment 2 is that, in the preparation process of the composite wood fiber in this embodiment, 17.1 parts of wood fiber powder and 0.9 parts of spherical yttrium oxide are added.

[0077] Example 5

[0078] The only difference between this embodiment and embodiment 2 is that, in the preparation process of the composite wood fiber in this embodiment, 16.2 parts of wood fiber powder and 1.8 parts of spherical yttrium oxide are added.

[0079] Example 6

[0080] The only difference between this embodiment and embodiment 2 is that, in the preparation process of the composite wood fiber in this embodiment, 17 parts of wood fiber powder and 1 part of spherical yttrium oxide are added.

[0081] Example 7

[0082] The only difference between this embodiment and embodiment 5 is that the preparation process of the composite wood fiber in this embodiment is different, specifically:

[0083] B1. Add 0.5 parts of spherical yttrium oxide to 25 parts of anhydrous ethanol and stir at 300 rpm for 15 minutes to disperse evenly to obtain a mixed solution I.

[0084] B2. Add 0.9 parts of γ-mercaptopropyltrimethoxysilane and 0.24 parts of oleic acid diethanolamide to 5 parts of anhydrous ethanol, mix well, and obtain a mixed solution II;

[0085] B3. Add the mixed solution II to the mixed solution I, stir at 300 rpm for 30 min at 60°C to disperse evenly, concentrate, and dry to obtain pretreated spherical yttrium oxide;

[0086] B4. Add the above-mentioned pretreated spherical yttrium oxide, 1.3 parts of vinyl pyrrolidone-vinyl acetate copolymer, 1.95 parts of γ-mercaptopropyltrimethoxysilane, and 1.2 parts of oleic acid diethanolamide to 25 parts of acetone, stir at 550 rpm for 50 minutes, and after uniform dispersion, add 16.2 parts of wood fiber powder, mix evenly, concentrate, and dry to obtain composite wood fiber.

[0087] Example 8

[0088] The only difference between this embodiment and embodiment 7 is that, in the preparation process of the composite wood fiber in this embodiment, 1.5 parts of spherical yttrium oxide and 0.3 parts of vinyl pyrrolidone-vinyl acetate copolymer are added.

[0089] Example 9

[0090] The only difference between this embodiment and embodiment 7 is that, in the preparation process of the composite wood fiber in this embodiment, 0.9 parts of spherical yttrium oxide and 0.9 parts of vinyl pyrrolidone-vinyl acetate copolymer are added.

[0091] Example 10

[0092] The only difference between this embodiment and embodiment 7 is that, during the preparation of the composite wood fiber in this embodiment, 1.35 parts of spherical yttrium oxide and 0.45 parts of vinyl pyrrolidone-vinyl acetate copolymer were added.

[0093] Comparative Example 1

[0094] The only difference between this comparative example and Example 2 is that in this comparative example, the composite wood fiber is replaced by an equal amount of wood fiber powder.

[0095] Comparative Example 2

[0096] The only difference between this comparative example and Example 2 is that in this comparative example, the composite wood fibers are replaced with an equal amount of spherical yttrium oxide.

[0097] Comparative Example 3

[0098] The only difference between this comparative example and Example 2 is that in this comparative example, no composite wood fiber is added.

[0099] Comparative Example 4

[0100] The only difference between this comparative example and Example 1 is that, during the preparation of the composite wood fiber in this comparative example, spherical yttrium oxide is replaced by spherical aluminum oxide.

[0101] Comparative Example 5

[0102] The only difference between this comparative example and Example 5 is that the preparation process of the composite wood fiber in this example is different, specifically:

[0103] 1.8 parts of vinyl pyrrolidone-vinyl acetate copolymer, 1.95 parts of γ-mercaptopropyltrimethoxysilane, and 1.2 parts of oleic acid diethanolamide were added to 25 parts of acetone, stirred at 550 rpm for 50 minutes, and after uniform dispersion, 16.2 parts of wood fiber powder were added, mixed evenly, concentrated, and dried to obtain composite wood fiber.

[0104] Experimental Example 1

[0105] The sheath layers of the power cables prepared in Examples 1 to 10 and Comparative Examples 1 to 5 were subjected to a mass wear test using the determination method in GB / T 3960-2016 “Test methods for sliding friction and wear of plastics”. The test results are shown in Table 1.

[0106] Table 1 Sheath layer volume wear test results

[0107]

[0108] Compared with Comparative Examples 1 to 5, the mass wear of the sheath layer of the power cables prepared in Examples 1 to 10 can be reduced to 0.125 g, indicating that when the composite wood fiber obtained by composite treatment of spherical yttrium oxide, vinyl pyrrolidone-vinyl acetate copolymer and wood fiber powder is added to the power cable sheath layer, the wear resistance of the power cable sheath layer can be significantly improved.

[0109] Experimental Example 2

[0110] Three specimens were cut from the sheath layer of the power cables prepared in Example 5, Examples 7 to 10, and Comparative Example 5, and dumbbell specimens with a thickness of 2 mm were prepared according to the method in GB / T 2951.11-2008 "General test methods for insulation and sheath materials of electric and optical cables - Part 11: General test methods - Thickness and dimensional measurements - Mechanical properties tests". The tensile strength was tested. The test results are shown in Table 2.

[0111] Table 2 Sheath layer tensile strength test results

[0112]

[0113] Compared with Example 5 and Comparative Example 5, the tensile strength of the sheath layer of the power cables prepared in Examples 7 to 10 is improved, indicating that when vinyl pyrrolidone-vinyl acetate copolymer is introduced into the raw material of the composite wood fiber, the wood fiber powder is composited with vinyl pyrrolidone-vinyl acetate copolymer and spherical yttrium oxide, which can improve the tensile strength of the power cable sheath layer.

[0114] A 360-degree bending tester (model HH-8618A) was used to conduct a bending resistance swing test on the power cables prepared in Examples 1 to 3. After swinging 5000 times at a swing speed of 30 times / min under an applied external force of 5 N, none of the power cable samples broke and no cracks were generated on the surface, indicating that the power cable provided by the present invention has good bending resistance.

[0115] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly wear-resistant and bend-resistant power cable, comprising a sheath layer, an insulation layer and a conductor from the outside to the inside, characterized in that: The sheath layer comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 10-15 parts of high-density polyethylene, 4-8 parts of methyl methacrylate-butadiene-styrene copolymer, 15-20 parts of composite wood fiber, 0.5-1.5 parts of antioxidant, 2-3 parts of plasticizer; The raw materials of the composite wood fiber include wood fiber powder and spherical yttrium oxide in a weight ratio of 5 to 19:1; The raw materials of the composite wood fiber also include vinyl pyrrolidone-vinyl acetate copolymer; The preparation method of the composite wood fiber comprises the following steps: B1. Add spherical yttrium oxide into anhydrous ethanol and disperse evenly to obtain mixed solution I; B2. Add silane coupling agent I and surfactant I to anhydrous ethanol and mix well to obtain a mixed solution II; B3, adding the mixed solution II to the mixed solution I, dispersing evenly, concentrating, and drying to obtain pretreated spherical yttrium oxide; B4, adding the pretreated spherical yttrium oxide, the vinyl pyrrolidone-vinyl acetate copolymer, the silane coupling agent II, and the surfactant II to acetone, and after uniform dispersion, adding the wood fiber powder, mixing evenly, concentrating, and drying to obtain composite wood fiber; The weight ratio of the spherical yttrium oxide and the vinyl pyrrolidone-vinyl acetate copolymer to the wood fiber powder is 1:9; The weight ratio of the spherical yttrium oxide to the vinyl pyrrolidone-vinyl acetate copolymer is 1-3:

1.

2. A highly wear-resistant and bend-resistant power cable according to claim 1, characterized in that: The weight ratio of the wood fiber powder to the spherical yttrium oxide is 9-17:

1.

3. The highly wear-resistant and bending-resistant power cable according to claim 1, characterized in that: The silane coupling agent I and the silane coupling agent II are each independently γ-mercaptopropyltrimethoxysilane; The surfactant I and surfactant II are each independently oleic acid diethanolamide.

4. A highly wear-resistant and bending-resistant power cable according to claim 1, characterized in that: The weight ratio of the spherical yttrium oxide, the silane coupling agent I and the surfactant I is 1:0.1-0.3:0.05-0.08; The weight ratio of the wood fiber powder, the silane coupling agent II and the surfactant II is 10:1-1.3:0.6-0.

8.

5. The highly wear-resistant and bending-resistant power cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1010 , antioxidant 300 , and antioxidant 626 .

6. A highly wear-resistant and anti-bending power cable according to claim 1, characterized in that: The plasticizer includes one or both of dibutyl phthalate and dioctyl sebacate.

7. The highly wear-resistant and bending-resistant power cable according to claim 1, characterized in that: The conductor is made of copper alloy or aluminum alloy; The insulating layer is a polyvinyl chloride insulating layer.

8. A method for preparing a highly wear-resistant and kink-resistant power cable, for preparing a highly wear-resistant and kink-resistant power cable according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Extruding and coating the insulating layer on the periphery of the conductor to form a semi-finished cable; S2. After blending the components of the sheath layer, the sheath layer is extruded and coated on the surface of the semi-finished cable to obtain the highly wear-resistant and bending-resistant power cable.

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