Wear-resistant tensile power cable and preparation method thereof

Abstract

The invention relates to the technical field of cable production, in particular to a wear-resistant tensile power cable and a preparation method thereof. The wear-resistant tensile power cable comprises a plurality of cable core wires, an elastic inner sheath, and an insulating tensile composite layer, a TPEE sheath layer, a PUR bottom coating and an organic silicon wear-resistant composite layer which are arranged outside the elastic inner sheath from inside to outside, wherein the cable core wires are located in the elastic inner sheath; a reinforcing wire is arranged in the elastic inner sheath. The reinforced wire rod is any one of a glass fiber composite wire, an aramid fiber composite wire and a UHMWPE fiber composite wire; the organic silicon wear-resistant composite layer is connected to the PUR bottom coating through chemical bonds. The wear-resistant tensile power cable provided by the invention has good wear resistance and weather resistance, and also has excellent tensile mechanical properties and insulation safety.

Description

Technical Field

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

[0002] Power cables are mainly used for the transmission of high-voltage electric energy in generation, distribution, transmission, transformation and power supply lines. The characteristics of high-voltage electric energy transmission are large current and high voltage, which requires power cables to have good wear-resistant self-protection properties, tensile mechanical properties and insulation safety performance.

[0003] At present, existing cables include a cable core and a sheath composite layer arranged on the outside of the cable core. The sheath composite layer is arranged on the shielding layer and protective layer of the cable core from the inside to the outside. The shielding layer is usually a metal tape layer; the protective layer is usually a rubber layer, and ethylene propylene rubber (EPR) is commonly used for the cable protective layer.

[0004] However, the cable prepared with EPDM as the cable protective layer has the problem of insufficient tensile and wear resistance. To this end, the present invention provides a wear-resistant and tensile-resistant power cable and a preparation method thereof. Summary of the Invention

[0005] In order to solve the problem of insufficient tensile and wear resistance of existing cables, the present invention provides a wear-resistant and tensile-resistant power cable and a preparation method thereof.

[0006] The present invention provides a wear-resistant and tensile-resistant power cable, which is achieved through the following technical solutions:

[0007] A wear-resistant and tensile-resistant power cable comprises several cable cores, an elastic inner sheath, an insulating tensile-resistant composite layer arranged on the outside of the elastic inner sheath from the inside to the outside, a TPEE sheath layer, a PUR primer layer, and an organosilicon wear-resistant composite layer, wherein the cable cores are located in the elastic inner sheath; a reinforcing wire is arranged in the elastic inner sheath; the polymer main chain of the PUR primer layer contains active double bonds; the organosilicon wear-resistant composite layer is made of a wear-resistant organosilicon resin, which is composed of component A and component B, wherein component A comprises vinyl silicone oil and vinyl silane-modified nano-molybdenum disulfide; component B comprises hydrogen-containing silicone oil and a platinum catalyst; the amount of vinyl silane-modified nano-molybdenum disulfide added to the organosilicon wear-resistant composite layer is 5-10wt%; and the organosilicon wear-resistant composite layer is connected to the PUR primer layer through a chemical bond.

[0008] The present invention uses lightweight and high-strength reinforcing wires and insulating tensile composite layers to synergistically improve the overall tensile mechanical strength of the power cable, and uses a PUR primer to firmly compound the silicone wear-resistant composite layer to the TPEE sheath layer. The polyester soft segment in the PUR primer has good compatibility with the soft segment of the TPEE resin in the TPEE sheath layer, so that the PUR primer can be firmly bonded to the TPEE sheath layer. The polymer main chain of the PUR primer contains active double bonds. Under the action of heating and / or initiators, the active double bonds in the polymer main chain of the PUR primer react with the vinyl groups contained in the wear-resistant silicone resin to undergo double bond polymerization. The silicone wear-resistant composite layer is connected to the PUR primer by chemical bonds, giving the power cable good wear resistance, stain resistance and weather resistance. In summary, the wear-resistant and tensile-resistant power cable of the present invention has good wear resistance and weather resistance, and has excellent tensile mechanical properties and insulation safety performance.

[0009] Preferably, the elastic inner sheath includes an elastic support frame and an elastic inner ring sleeve, and the reinforcing wire is coaxially arranged in the elastic support frame; the outer wall of the elastic support frame is integrally formed with a plurality of embedding grooves A; the inner wall of the elastic inner ring sleeve is integrally formed with a plurality of embedding grooves B; the embedding grooves A of the elastic support frame and the embedding grooves B of the elastic inner ring sleeve form a cable core filling groove; the cable core is filled in the cable core filling groove of the elastic inner sheath.

[0010] The elastic inner sheath in the present invention can improve the bending resistance of the power cable and effectively protect the cable core wire. The bending radius is 6 times the outer diameter of the wire, the bending repetition rate is 88m / min, and the cable core wire will not be broken or short-circuited after 5 million reciprocating motions, and there is no crack on the outer surface of the power cable.

[0011] Preferably, the PUR primer is made of a PUR surface polyurethane resin, and the PUR surface polyurethane is made of component A, component B, and component C. Component A is an -NCO-terminated polyurethane prepolymer, and component A includes diisocyanate, polyester polyol, side-chain grafted vinyl-modified dihydroxy-terminated silicone oil, an organic tin catalyst, and a strongly polar aprotic solvent. The molar amount of -NCO in the diisocyanate is 1.4-1.6 times the sum of the molar amounts of hydroxyl groups in the polyester polyol and the side-chain grafted vinyl-modified dihydroxy-terminated silicone oil; component B is composed of a chain extender, a free radical initiator, an organic tin catalyst, and a strongly polar aprotic solvent; the ratio of the molar amount of active hydrogen in the chain extender to the molar amount of -NCO in component A is (0.8-1):1; and component C is an aminosilane-modified filler.

[0012] Further preferably, the molar ratio of the polyester polyol to the side chain grafted vinyl modified bishydroxy terminated silicone oil is 1:(0.8-1.2).

[0013] The inventors controlled the amount of polyester polyol used to regulate the peel strength between the PUR primer and the TPEE sheath layer and the peel strength between the PUR primer and the silicone wear-resistant composite layer, thereby ensuring the wear resistance, durability and weather resistance of the power cable.

[0014] Preferably, the chain extender is composed of maleic acid diamine and a small molecule diol; the small molecule diol is at least one of 1,4-butanediol, 1,6-hexanediol, 1,3-propylene glycol, and 1,5-pentanediol; and the molar ratio of maleic acid diamine to small molecule diol is 1:(1-3).

[0015] By controlling the amount of maleic acid diamine, the inventors regulated the peel strength between the PUR primer and the TPEE jacket layer, and the peel strength between the PUR primer and the silicone wear-resistant composite layer, thereby ensuring the wear resistance, durability, and weather resistance of the power cable. Furthermore, the advantage of using maleic acid diamine as a chain extender is that the primary amine groups in maleic acid diamine can undergo a chain extension reaction with the -NCO-terminated polyurethane prepolymer in component A at room temperature to complete the shaping. This allows the PUR surface polyurethane resin to rapidly cure to form a condensed PUR primer film. Subsequently, curing at 60-75°C for 30-60 minutes allows the primary hydroxyl groups in the small molecule diol to fully react with the residual -NCO groups, ultimately forming a fixed PUR primer, which is beneficial for improving the production and processing performance of the power cable. This solves the problems of long curing reaction time and low coating efficiency of traditional PUR primers.

[0016] Preferably, the free radical initiator is at least one of dicumyl peroxide, dicyclohexyl peroxydicarbonate, benzoyl peroxide, and tert-butyryl peroxide.

[0017] The present invention uses a high-temperature free radical initiator to prevent the consumption of active double bonds in the PUR surface polyurethane resin during the curing stage at 60-75°C. The resulting PUR base coat has good flexibility. After coating with a wear-resistant silicone resin, the free radical initiator decomposes at 120-140°C to produce free radicals, which cause a double bond polymerization reaction between the vinyl groups in the wear-resistant silicone resin and the active double bonds in the polymer backbone of the PUR base coat. The wear-resistant silicone composite layer is chemically bonded to the PUR base coat, giving the power cable excellent wear resistance, stain resistance, and weather resistance. In other words, the use of this free radical initiator can improve the processing performance of the wear-resistant and tensile-resistant power cable of the present invention.

[0018] Preferably, the aminosilane modified filler is made of aminosilane and ultrafine inorganic filler; the aminosilane is one or more combinations of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane; the ultrafine inorganic filler is at least one of calcium carbonate, alumina, titanium dioxide, barium sulfate, mica powder, kaolin, and attapulgite with a particle size of less than 10 microns.

[0019] The aminosilane-modified filler in the present invention has good compatibility with the polyurethane surface layer resin formed by components A and B, so that the aminosilane-modified filler can be evenly distributed in the polyurethane surface layer resin. In addition, the aminosilane-modified filler contains an amino group that can react with the residual -NCO group, so that the aminosilane-modified filler is fixedly connected to the polymer main chain of the PUR primer layer in the form of an NH-CO polyurethane bond (chemical bond), which can improve the weather resistance, wear resistance and mechanical strength of the PUR primer layer.

[0020] Preferably, the insulating tensile composite layer is composed of an insulating tensile S layer and an insulating tensile Z layer, wherein the insulating tensile S layer is made by impregnating resin and continuous fibers through a winding molding process, and the continuous fibers in the insulating tensile S layer are wound clockwise; the insulating tensile Z layer is made by impregnating resin and continuous fibers through a winding molding process, and the continuous fibers in the insulating tensile Z layer are wound counterclockwise; the continuous fibers in the insulating tensile composite layer are selected from high-strength S glass fibers or low-dielectric D glass fibers.

[0021] The insulating tensile composite layer of the present invention can effectively improve the overall tensile mechanical properties.

[0022] Preferably, the reinforcing wire is any one of a glass fiber composite wire, an aramid composite wire, and a UHMWPE fiber composite wire.

[0023] The present invention adopts lightweight and high-strength glass fiber composite wire or aramid composite wire or UHMWPE fiber composite wire to replace traditional metal wire or alloy wire, which ensures the tensile strength of the power cable while reducing the overall weight of the power cable, which is conducive to the lightweight development of the power cable.

[0024] The present invention provides a method for preparing a wear-resistant and tensile-resistant power cable, which is achieved through the following technical solutions:

[0025] A method for preparing a wear-resistant and tensile-resistant power cable comprises the following steps:

[0026] Step 1: Prepare an elastic support frame filled with coaxial reinforcing wires through an extrusion molding process;

[0027] At the same time, PUR surface layer polyurethane resin and silicone wear-resistant resin are configured;

[0028] Step 2: The cable core is embedded in the embedding groove A of the elastic support frame, and the TPEE resin melt material is compounded on the outer wall of the elastic support frame by an extrusion molding process. After naturally cooling to room temperature, an elastic inner ring is compounded on the outer wall of the elastic support frame to finally obtain an elastic inner sheath;

[0029] Step 3: The elastic inner sheath is wound clockwise around the continuous fiber impregnated with the impregnating resin by a winding molding process to solidify to form an insulating tensile-resistant S layer, and then the insulating tensile-resistant S layer is wound counterclockwise around the continuous fiber impregnated with the impregnating resin by a winding molding process to solidify to form an insulating tensile-resistant Z layer, that is, the elastic inner sheath forms an insulating tensile-resistant composite layer to obtain a semi-finished cable;

[0030] Step 4: Compound the TPEE resin melt material on the outer wall of the semi-finished cable through an extrusion molding process, and naturally cool it to room temperature to compound the TPEE sheath layer on the semi-finished cable;

[0031] Step 5: Apply PUR surface polyurethane resin to the surface of TPEE sheath layer, place it at 60-75℃ for curing for 30-60min, then apply silicone wear-resistant resin, place it at 120-140℃ for curing for 15-60min to obtain the finished wear-resistant and tensile-resistant power cable.

[0032] In summary, the present invention has the following advantages:

[0033] 1. The wear-resistant and tensile-resistant power cable of the present invention has good wear resistance and weather resistance as well as excellent tensile mechanical properties and insulation safety performance.

[0034] 2. The preparation method of wear-resistant and tensile-resistant power cables provided in the present invention can meet the needs of continuous production, and the extrusion molding process involved is relatively simple and mature, with low professional requirements for operators, which facilitates the mass production of wear-resistant and tensile-resistant power cables and enhances the market competitiveness of wear-resistant and tensile-resistant power cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the wear-resistant and tensile-resistant power cable in the present invention.

[0036] Figure 2 It is a structural schematic diagram of a special-shaped extrusion die for an elastic support frame of a coaxially filled reinforced wire.

[0037] In the figure, 1. Cable core wire; 10. Cable core wire filling groove; 11. Copper stranded wire; 12. PVC sheath; 2. Elastic inner sheath; 20. Reinforced wire; 21. Elastic support frame; 211. Embedded groove A; 22. Elastic inner ring sleeve; 221. Embedded groove B; 3. Insulation tensile composite layer; 4. TPEE sheath layer; 5. PUR base coating; 6. Silicone wear-resistant composite layer. DETAILED DESCRIPTION

[0038] In order to further understand the creativity and technical advancement of the present invention, the preferred embodiments of the present invention are discussed in detail below in conjunction with examples and comparative examples.

[0039] Example: Reference Figure 1 A wear-resistant and tensile-resistant power cable includes several cable core wires 1, an elastic inner sheath 2, an insulating tensile-resistant composite layer 3 arranged from the inside to the outside on the outside of the elastic inner sheath 2, a TPEE sheath layer 4, a PUR primer layer 5, and a silicone wear-resistant composite layer 6. The cable core wires 1 are all filled in the elastic inner sheath 2.

[0040] Reinforcement wires 20 are disposed within the elastic inner sheath 2. These wires can be any of glass fiber composite wires, aramid fiber composite wires, or UHMWPE fiber composite wires produced through a pultrusion process. The diameter of the reinforcing wires 20 depends on the outer diameter of the wear-resistant and tensile-resistant power cable and ranges from 1 to 3 mm. Using lightweight, high-strength glass fiber composite wires, aramid fiber composite wires, or UHMWPE fiber composite wires instead of traditional metal or alloy wires ensures the tensile strength of the power cable while reducing its overall weight, contributing to the development of lightweight power cables.

[0041] refer to Figure 1 The elastic inner sheath 2 includes an elastic support frame 21 and an elastic inner ring 22. The reinforcing wire 20 is coaxially arranged in the elastic support frame 21. The elastic support frame 21 coaxially filled with the reinforcing wire 20 is made of a special-shaped extrusion die (see Figure 2 ) is made by combining the extrusion molding process. The outer wall of the elastic support frame 1 is integrally extruded with a plurality of embedding grooves A211, and the number of embedding grooves A211 is equal to the number of cable cores 1. Taking a conventional three-phase cable as an example, the number of embedding grooves A211 is three. The inner wall of the elastic inner sheath 2 is integrally extruded with a plurality of embedding grooves B221, and the number of embedding grooves B221 is equal to the number of cable cores 1. Taking a conventional three-phase cable as an example, the number of embedding grooves B221 is three. The arc angle of the embedding groove B221 of the elastic inner sheath 2 is 120°, the arc angle of the embedding groove A211 of the elastic support frame 1 is 240°, and the ratio of the opening length of the embedding groove A211 of the elastic support frame 21 to the diameter of the cable core is 3 0.5 :2, the embedding groove A211 of the elastic support frame 21 and the embedding groove B221 of the elastic inner sheath 2 form a cable core filling groove 10. Taking a conventional three-phase cable as an example, the elastic inner sheath 2 contains three cable core filling grooves 10 evenly distributed around the central axis of the elastic support frame 21. The cable core 1 is filled in the cable core filling grooves 10.

[0042] The elastic support frame 21 and the elastic inner ring sleeve 22 are both made of TPEE resin formula for cables.

[0043] The TPEE resin for cables is made of 85 parts by mass of DuPont HTR 8667 TPEE resin from the United States, 1 part by mass of antioxidant 1010, 1 part by mass of ultraviolet absorber UV-1577, 2 parts by mass of zinc stearate, 1 part by mass of titanate coupling agent - isopropyl tri(dioctyl pyrophosphate) titanate HY-201, 2 parts by mass of Huifu Nanomaterials' vapor-phase titanium dioxide NF-50, and 8 parts by mass of Manli Nanotechnology's nano calcium carbonate ML-CaCO3-N100.

[0044] The insulating tensile composite layer 3 is composed of an insulating tensile S layer and an insulating tensile Z layer. The insulating tensile S layer is made by impregnating resin and continuous fibers through a winding molding process. The continuous fibers in the insulating tensile S layer are wound clockwise. Specifically, the continuous fibers impregnated with the impregnating resin are wound clockwise on the elastic inner sheath 2 through a winding molding process, and then naturally cooled to room temperature to solidify to form the insulating tensile S layer. The insulating tensile Z layer is made by impregnating resin and continuous fibers through a winding molding process. The continuous fibers in the insulating tensile Z layer are wound counterclockwise. Specifically, the continuous fibers impregnated with the impregnating resin are wound clockwise on the insulating tensile S layer on the elastic inner sheath 2 through a winding molding process, and then naturally cooled to room temperature to solidify to form the insulating tensile Z layer. The continuous fibers in the insulating tensile composite layer 3 are selected from high-strength S glass fibers or low-dielectric D glass fibers. The impregnating resin formula in the insulating tensile composite layer 3 is the same as that of the elastic support frame 21 and the elastic inner ring sleeve 22, and is the same as that of the TPEE resin for cables.

[0045] The TPEE sheath layer 4, as the primary protective material for wear-resistant and tensile-resistant power cables, requires flame retardancy. The cable sheathing TPEE resin formulation for the TPEE sheath layer 4 is as follows: The cable TPEE resin is composed of 70 parts by mass of DuPont HTR 8667 TPEE resin, 1 part by mass of antioxidant 1010, 1 part by mass of UV absorber UV-1577, 2 parts by mass of zinc stearate, 2 parts by mass of titanate coupling agent HY-201, 2 parts by mass of fumed titanium dioxide NF-50, 8 parts by mass of nano-calcium carbonate ML-CaCO3-N100, 5 parts by mass of ultrafine aluminum hydroxide, 5 parts by mass of ultrafine magnesium hydroxide, and 4 parts by mass of nano-molybdenum disulfide.

[0046] The flame retardant fillers are ultrafine aluminum hydroxide with the brand H-WF-10 from the Shandong Branch of China Aluminum Corporation Limited and hexagonal magnesium hydroxide XD-MH150 from Wuhu Xinda New Material Technology Co., Ltd. with a particle size of D 50 =1.5-2µm, 3000 mesh flake molybdenum disulfide with the brand MP-2 produced by Qinghe Chaotai Metal Materials Co., Ltd.

[0047] The PUR primer layer 5 is made from a PUR surface layer polyurethane resin, which is composed of components A, B, and C. Component C is an aminosilane-modified filler, and its content in the PUR surface layer polyurethane resin is 5-20%. The aminosilane-modified filler is made from aminosilane and ultrafine inorganic filler.

[0048] The aminosilane is one or more of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane.

[0049] The ultrafine inorganic filler is at least one of calcium carbonate, aluminum oxide, titanium dioxide, barium sulfate, mica powder, kaolin and attapulgite with a particle size of less than 10 microns.

[0050] Component A is an -NCO-terminated polyurethane prepolymer, which includes diisocyanate, polyester polyol, side-chain grafted vinyl-modified dihydroxy-terminated silicone oil, organic tin catalyst, and strong polar aprotic solvent.

[0051] The diisocyanate is liquid MDI, specifically Wanhua Wannate MDI-100HL.

[0052] The polyester polyol is polycaprolactone diol, specifically BASF PD1-10 PCL1000.

[0053] The side-chain grafted vinyl-modified dihydroxy-terminated silicone oil is a vinyl hydroxy silicone oil purchased by Hubei Shineng Chemical Technology Co., Ltd. It is a colorless transparent liquid with a hydroxyl content of 6±0.5%, a vinyl content of 6±0.5%, a viscosity (25°C): ≤33mm2 / s, and a water content of ≤0.35%.

[0054] The organotin catalyst is dibutyltin dilaurate T12.

[0055] The highly polar aprotic solvent is at least one of acetone, dimethyl sulfoxide, and dimethylformamide.

[0056] The molar ratio of polycaprolactone diol PD1-10 to vinyl hydroxy silicone oil is 1:(0.8-1.2). Preferably, the molar ratio of polycaprolactone diol PD1-10 to vinyl hydroxy silicone oil is 1:0.8.

[0057] The molar amount of -NCO in the diisocyanate is 1.4-1.6 times the total molar amount of hydroxyl groups in the polyester polyol and the side-chain grafted vinyl-modified bis-hydroxy-terminated silicone oil. Preferably, the molar amount of -NCO in the diisocyanate is 1.5 times the total molar amount of hydroxyl groups in the polyester polyol and the side-chain grafted vinyl-modified bis-hydroxy-terminated silicone oil.

[0058] Component B comprises a chain extender, a free radical initiator, an organotin catalyst, and a highly polar aprotic solvent. The organotin catalyst is dibutyltin dilaurate T12. The highly polar aprotic solvent is at least one of acetone, dimethyl sulfoxide, and dimethylformamide.

[0059] The ratio of the molar amount of active hydrogen in the chain extender to the molar amount of -NCO in component A is (0.8-1): 1. Preferably, the ratio of the molar amount of active hydrogen in the chain extender to the molar amount of -NCO in component A is (0.9-0.95): 1.

[0060] The chain extender is composed of maleic acid diamine and small molecule diol.

[0061] The small molecule diol is at least one of 1,4-butanediol, 1,6-hexanediol, 1,3-propylene glycol, and 1,5-pentanediol. The molar ratio of maleic acid diamine to the small molecule diol is 1:(1-3), preferably, the molar ratio of maleic acid diamine to the small molecule diol is 1:1.

[0062] The free radical initiator is at least one of dicumyl peroxide, dicyclohexyl peroxydicarbonate, benzoyl peroxide, and tert-butyryl peroxide.

[0063] The polymer backbone of the PUR primer layer 5 contains active double bonds. The organic silicon wear-resistant composite layer 6 is made of a wear-resistant organic silicon resin. The organic silicon wear-resistant resin is composed of component A and component B.

[0064] Component A consists of vinyl silicone oil and vinyl silane-modified nano-molybdenum disulfide. The vinyl silane-modified nano-molybdenum disulfide is made from vinyl silane (KH151) and nano-molybdenum disulfide (3000-mesh MP-2 flake molybdenum disulfide, manufactured by Qinghe Chaotai Metal Materials Co., Ltd.). The content of the vinyl silane-modified nano-molybdenum disulfide in the wear-resistant silicone resin is 5-10wt%.

[0065] Component B includes hydrogenated silicone oil and platinum catalyst. The organic silicon wear-resistant composite layer 6 is chemically bonded to the PUR base coating 5, giving the power cable excellent wear resistance, stain resistance, and weather resistance.

[0066] See also Figure 1 A method for preparing a wear-resistant and tensile-resistant power cable comprises the following steps:

[0067] Step 1: Prepare the elastic support frame 21 and the elastic inner ring sleeve 22 of the coaxial filling reinforcement wire 20 by extrusion molding process; and simultaneously configure the PUR surface layer polyurethane resin and silicone wear-resistant resin;

[0068] Step 2: The cable core 1 is embedded in the embedding groove A211 of the elastic support frame 21, and the TPEE resin melt material is compounded on the outer wall of the elastic support frame 21 through an extrusion molding process. After naturally cooling to room temperature, the elastic inner ring sleeve 22 is compounded on the outer wall of the elastic support frame 21 to finally obtain the elastic inner sheath 2;

[0069] Step 3: The elastic inner sheath 2 is wound clockwise around the continuous fiber impregnated with the impregnating resin by a winding molding process to solidify to form an insulating tensile S layer, and then the insulating tensile Z layer is wound counterclockwise around the continuous fiber impregnated with the impregnating resin by a winding molding process to solidify to form the insulating tensile Z layer. That is, the elastic inner sheath 2 forms an insulating tensile composite layer 3 to obtain a semi-finished cable;

[0070] Step 4: Compounding the TPEE resin melt material on the outer wall of the semi-finished cable through an extrusion molding process, and naturally cooling it to room temperature to compound the TPEE sheath layer 4 on the semi-finished cable;

[0071] Step 5: Apply PUR surface polyurethane resin to the surface of TPEE sheath layer 4, place it at 60-75°C for curing for 30-60 minutes, then apply silicone wear-resistant resin, place it at 120-140°C for curing for 15-60 minutes to obtain the finished wear-resistant and tensile-resistant power cable.

[0072] Example 1: A wear-resistant and tensile-resistant power cable filled with reinforcing wire 20 selected DuPont-HTR 8667 TPEE resin as pre-impregnated resin and Dalima 100D ultra-high molecular weight polyethylene fiber as continuous fiber to prepare a UHMWPE fiber composite wire with a diameter of 1.20 mm through a pultrusion process.

[0073] A method for preparing a wear-resistant and tensile-resistant power cable comprises the following steps:

[0074] Step 1, preparation of the filling reinforcement wire 20: HTR 8667 TPEE resin is heated and melted to 220°C to obtain a prepreg melt, the prepreg melt is injected into a glue injection box, and the 100D ultra-high molecular weight polyethylene fiber is input into a molding die after passing through the glue injection box to complete the impregnation treatment of the 100D ultra-high molecular weight polyethylene fiber. The impregnated 100D ultra-high molecular weight polyethylene fiber is impregnated and pultruded. The pultrusion molding parameters are: zone 1 temperature 170°C, zone 1 residence time 20s; zone 2 temperature 120°C, zone 2 residence time 60s; zone 3 temperature 80°C, zone 3 residence time 180s; pultrusion speed 60cm / min, and naturally cooled to room temperature to obtain a UHMWPE fiber composite wire with a diameter of 1.20mm.

[0075] At the same time, PUR surface layer polyurethane resin and silicone wear-resistant resin are configured;

[0076] The preparation method of PUR surface layer polyurethane resin is as follows:

[0077] Preparation of Component A: 100 parts by weight of polycaprolactone diol PD1-10 PCL1000 and 60 parts by weight of vinyl hydroxy silicone oil are placed in a reaction kettle and dehydrated under vacuum at 120°C for 2 hours. 86.9 parts by weight of Wannate MDI-100HL, 0.04 parts by weight of dibutyltin dilaurate T12, and 200 parts by weight of dimethylformamide (DMF) are then added. The temperature is adjusted to 80°C and the reaction is carried out for 2 hours. Component A is obtained when the -NCO content in the system tends to be stable.

[0078] Preparation of component B: 4.56 parts by weight of maleic acid diamine, 5.92 parts by weight of 1,6-hexanediol, 0.02 parts by weight of dibutyltin dilaurate T12, 2 parts of free radical initiator - dicyclohexyl peroxydicarbonate (DCPD), and 10 parts by weight of dimethylformamide (DMF) are mixed evenly;

[0079] Preparation of component C: 20 parts by weight of fumed titanium dioxide NF-50, 55 parts by weight of nano calcium carbonate ML-CaCO3-N100, 25 parts by weight of nano alumina CW-Al2O3-003 (average particle size 200 nm, Shanghai Chaowei Nano) and 5 parts by weight of γ-aminopropyltriethoxysilane KH550 were weighed and kneaded for 30 minutes to obtain an aminosilane-modified filler;

[0080] When used, 446.94 parts by weight of component A, 20.5 parts by weight of component B, and 20.6 parts by weight of component C are mixed evenly at 0°C to obtain the PUR surface layer polyurethane resin. Since the open time of the PUR surface layer polyurethane resin is short, it is used immediately after being prepared.

[0081] The preparation method of organic silicon wear-resistant resin is as follows:

[0082] Preparation of component A: Weigh 97 parts by weight of nano-molybdenum disulfide MP-2 and 3 parts by weight of vinyl silane KH151 and knead them for 30 minutes to obtain vinyl silane-modified nano-molybdenum disulfide. Then weigh 6 parts by weight of vinyl silane-modified nano-molybdenum disulfide and mix them with 24 parts by weight of vinyl silicone oil (Andisil VS1000, produced by Ambiah Special Silicone (Nantong) Co., Ltd., with a vinyl content of 0.11 mmoles / g) and 65.9 parts by weight of vinyl silicone oil (Andisil VS 400, produced by Ambiah Special Silicone (Nantong) Co., Ltd., with a vinyl content of 0.19 mmoles / g) to obtain component A.

[0083] Preparation of component B: 9 parts by weight of a chain extender, hydrogenated silicone oil (Andsil CE-13, produced by Ambiy Specialty Silicone (Nantong) Co., Ltd., with a Si-H content of 1.37 mmoles / g), 2 parts of a free radical initiator, dicyclohexyl peroxydicarbonate (DCPD), 1 part by weight of a crosslinker, hydrogenated silicone oil (Andisi1 XL-1340, produced by Ambiy Specialty Silicone (Nantong) Co., Ltd., which contains H-terminated and pendant H functional bonds, with a Si-H content of 3.0 mmoles / g), and 0.1 g of a platinum catalyst were mixed uniformly to obtain component B;

[0084] When in use, mix component A and component B evenly to obtain the silicone wear-resistant resin;

[0085] Step 2, preparation of the elastic support frame 21 of the coaxial filling reinforced wire 20: first, 85 parts by mass of American DuPont-HTR 8667 TPEE resin, 1 part by mass of antioxidant 1010, 1 part by mass of ultraviolet absorber UV-1577, 2 parts by mass of zinc stearate, 1 part by mass of titanate coupling agent HY-201, 2 parts by mass of fumed titanium dioxide NF-50, and 8 parts by mass of nano calcium carbonate ML-CaCO3-N100 are placed in a high-speed dispersion kettle and dispersed at 500 rpm for 1 hour to obtain a mixture, and the mixture is put into a twin-screw extruder. The twin-screw extruder has a total of 7 heating temperature zones, and the set temperatures of heating zones 1-7 are: 170°C → 190°C → → 200°C → 210 ℃→220℃→220℃→220℃, the TPEE melt extruded from the die head is injected into the special-shaped mold, a UHMWPE fiber composite wire is passed through the center of the special-shaped mold, the TPEE melt is coated on the outer wall of the UHMWPE fiber composite wire, the temperature of the three temperature zones in the special-shaped mold is 190℃→120℃→80℃, the residence time of the three temperature zones is 10s→60s→120s respectively, and the elastic support frame 21 of the coaxial filling reinforcement wire 20 is obtained by natural cooling to room temperature. The diameter of the formed embedding groove A211 is 5.0mm, and the diameter of the elastic support frame 21 is 6.0mm;

[0086] Step 3: The core wire of a single cable is 16mm in size. 2 Copper stranded wire 11 and coated with 16mm specification 2The PVC sheath 12 of the outer wall of the copper stranded wire 11 is provided, and the diameter of a single cable core wire is 5 mm. The cable core wire 1 is embedded in the embedding groove A211 of the elastic support frame 21 to obtain an assembled semi-finished wire. Subsequently, 85 parts by mass of American DuPont-HTR 8667 TPEE resin, 1 part by mass of antioxidant 1010, 1 part by mass of ultraviolet absorber UV-1577, 2 parts by mass of zinc stearate, 1 part by mass of titanate coupling agent HY-201, 2 parts by mass of fumed titanium dioxide NF-50, and 8 parts by mass of nano calcium carbonate ML-CaCO3-N100 are placed in a high-speed dispersion kettle and dispersed at 500 rpm for 1 hour to obtain a mixture. The mixture is then put into a twin-screw extruder. The twin-screw extruder has a total of 7 heating temperature zones, 1-7 heating zones. The set temperature of the hot zone is: 170°C → 190°C → 200°C → 210°C → 220°C → 220°C → 220°C. The TPEE melt extruded from the die head is injected into the special-shaped mold. The center of the special-shaped mold is provided with an assembly semi-finished product line. The TPEE resin melt is compounded on the outer wall of the assembly semi-finished product line through an extrusion molding process. After naturally cooling to room temperature, an elastic inner ring sleeve 22 is compounded on the outer wall of the assembly semi-finished product line, and finally an elastic inner sheath 2 of a coaxial filled reinforced wire 20 with a diameter of 7.8 mm is produced.

[0087] Step three, the elastic inner sheath 2 is formed into an insulating tensile composite layer 3 through a winding molding process to produce a semi-finished cable: HTR 8667 TPEE resin is heated and melted to 220°C to obtain a pre-impregnated melt, and the impregnated melt is injected into the injection box of the winding machine. The high-strength HS2 glass fiber of Nanjing Fiberglass Institute is input into the molding mold after passing through the injection box to complete the impregnation treatment of the high-strength HS2 glass fiber. The high-strength HS2 glass fiber after impregnation is impregnated and subjected to a winding molding process. The high-strength HS2 glass fiber impregnated with the pre-impregnated melt is wound clockwise on the outer wall of the elastic inner sheath 2 of the coaxial filling reinforcement wire 20, and naturally cooled to room temperature to solidify on the outer wall of the elastic inner sheath 2 to form an insulating tensile S layer. Subsequently, the elastic inner sheath 2 compounded with the insulating tensile S layer is placed in a winding machine, HTR 8667 TPEE resin is heated and melted to 220°C to obtain a pre-impregnated melt, which is then injected into the glue injection box of another winding machine. The high-strength HS2 glass fiber of Nanjing Fiberglass Institute is then input into the molding mold after passing through the glue injection box to complete the impregnation treatment of the high-strength HS2 glass fiber. The impregnated high-strength HS2 glass fiber is then impregnated and subjected to a winding molding process. The high-strength HS2 glass fiber impregnated with the pre-impregnated melt is wound counterclockwise around the outer wall of the insulating tensile S layer and naturally cooled to room temperature. The insulating tensile Z layer is then solidified outside the insulating tensile S layer, i.e., the elastic inner sheath 2 forms an insulating tensile composite layer 3 to obtain a semi-finished cable.

[0088] Step 4: 70 parts by mass of DuPont-HTR 8667 TPEE resin, 1 part by mass of antioxidant 1010, 1 part by mass of ultraviolet absorber UV-1577, 2 parts by mass of zinc stearate, 2 parts by mass of titanate coupling agent HY-201, 2 parts by mass of fumed titanium dioxide NF-50, 8 parts by mass of nano calcium carbonate ML-CaCO3-N100, 5 parts by mass of ultrafine aluminum hydroxide, 5 parts by mass of ultrafine magnesium hydroxide, and 4 parts by mass of nano molybdenum disulfide were placed in a high-speed dispersing kettle and dispersed at 500 rpm for 1 hour to obtain a mixture, and the mixture was fed into a twin-screw In the twin-screw extruder, there are 7 heating temperature zones. The set temperatures of heating zones 1-7 are: 175℃→200℃→210℃→220℃→225℃→225℃→225℃. The TPEE melt extruded from the die head is injected into the special-shaped mold. The TPEE resin melt is compounded with the outer wall of the semi-finished cable through the extrusion molding process. After naturally cooling to room temperature, the semi-finished cable is compounded with a TPEE sheath layer 4. The wall thickness of the TPEE sheath layer 4 is 2.4mm, and the diameter of the semi-finished cable is 10.2mm.

[0089] Step five, apply the PUR surface polyurethane resin in step one to the surface of the TPEE sheath layer 4, place it at 70°C for curing for 60 minutes, and cure the outer wall of the TPEE sheath layer 4 to form a PUR primer layer 5 with a thickness of 600 microns. Then, apply the silicone wear-resistant resin in step one to the surface of the PUR primer layer 5, place it at 105°C for curing for 30 minutes, and cure the outer wall of the PUR primer layer 5 to form a silicone wear-resistant composite layer 6 with a thickness of 200 microns. The finished wear-resistant and tensile-resistant power cable with a diameter of 11.0 mm can be obtained by winding it up.

[0090] The difference between Example 2 and Example 1 is that in the preparation method of component A of the silicone wear-resistant resin, 8 parts by weight of vinylsilane-modified nano-molybdenum disulfide, 24 parts by weight of vinyl silicone oil Andisil Vs 1000, and 65.9 parts by weight of vinyl silicone oil Andisil Vs 400 are weighed and evenly mixed to obtain component A.

[0091] The difference between Example 3 and Example 1 is that in the preparation method of component A of the silicone wear-resistant resin, 10 parts by weight of vinylsilane-modified nano-molybdenum disulfide, 24 parts by weight of vinyl silicone oil Andisil Vs 1000, and 65.9 parts by weight of vinyl silicone oil Andisil Vs 400 are weighed and evenly mixed to obtain component A.

[0092] The difference between Example 4 and Example 1 is that in the preparation method of component A of the silicone wear-resistant resin, 6 parts by weight of vinyl silane-modified nano-molybdenum disulfide, 24 parts by weight of vinyl silicone oil (Andisil SF 1421 from Ambiya Special Silicone (Nantong) Co., Ltd., with a vinyl content of 0.13 mmoles / g and a phenyl content of 3.0 mole%), and 65.9 parts by weight of vinyl silicone oil Andisil VS 400 are weighed and mixed uniformly to obtain component A.

[0093] The difference between Example 5 and Example 1 is that in the preparation method of component B of the silicone wear-resistant resin, 9 parts by weight of the chain extender hydrogenated silicone oil Andsil CE-13, 2 parts of the free radical initiator - dicyclohexyl peroxydicarbonate (DCPD), 1 part by weight of the crosslinker - hydrogenated silicone oil Andisi1 XL-2450 and 0.1 g of platinum catalyst are mixed evenly to obtain component B.

[0094] The difference between Example 6 and Example 4 is that in the preparation method of component B of the silicone wear-resistant resin, 9 parts by weight of the chain extender hydrogenated silicone oil Andsil CE-13, 2 parts of the free radical initiator - dicyclohexyl peroxydicarbonate (DCPD), 1 part by weight of the cross-linking agent - hydrogenated silicone oil Andisi1 XL-2450 and 0.1 g of platinum catalyst are mixed evenly to obtain component B.

[0095] Example 7 differs from Example 1 in that: in the preparation method of component A of the PUR surface layer polyurethane resin, 110 parts by weight of polycaprolactone diol PD1-10 PCL1000 and 54 parts by weight of vinyl hydroxy silicone oil are placed in a reactor at 120°C and vacuum-dehydrated for 2 hours. 86.9 parts by weight of Wannate MDI-100HL, 0.04 parts by weight of dibutyltin dilaurate T12, and 200 parts by weight of dimethylformamide (DMF) are then added. The temperature is adjusted to 80°C and the reaction is carried out for 2 hours. The -NCO content in the detection system stabilizes, thereby obtaining component A. Components B and C are prepared in the same manner. When used, 450.94 parts by weight of component A, 20.5 parts by weight of component B, and 20.6 parts by weight of component C are uniformly mixed at 0°C to obtain the PUR surface layer polyurethane resin.

[0096] Example 8 differs from Example 1 in that, in the preparation method for component A of the PUR surface layer polyurethane resin, 92 parts by weight of polycaprolactone diol PD1-10 PCL1000 and 64.8 parts by weight of vinyl hydroxy silicone oil are placed in a reactor at 120°C and vacuum-dehydrated for 2 hours. 86.9 parts by weight of Wannate MDI-100HL, 0.04 parts by weight of dibutyltin dilaurate T12, and 200 parts by weight of dimethylformamide (DMF) are then added. The temperature is adjusted to 80°C and the reaction is carried out for 2 hours. Component A is obtained when the -NCO content in the detection system stabilizes. Components B and C are prepared in the same manner. Upon use, 443.74 parts by weight of component A, 20.5 parts by weight of component B, and 20.6 parts by weight of component C are uniformly mixed at 0°C to obtain the PUR surface layer polyurethane resin.

[0097] Example 9 differs from Example 1 in that: In the preparation method of component B of the PUR surface layer polyurethane resin, 5.14 parts by weight of diamine maleate, 5.32 parts by weight of 1,6-hexanediol, 0.02 parts by weight of dibutyltin dilaurate T12, 2 parts of dicyclohexyl peroxydicarbonate (DCPD) as a free radical initiator, and 10 parts by weight of dimethylformamide (DMF) are mixed. Components A and C are prepared in the same manner. When used, 443.74 parts by weight of component A, 20.48 parts by weight of component B, and 20.6 parts by weight of component C are mixed at 0°C to obtain the PUR surface layer polyurethane resin.

[0098] Example 10 differs from Example 1 in that: In the preparation method of component B of the PUR surface layer polyurethane resin, 3.42 parts by weight of diamine maleate, 7.10 parts by weight of 1,6-hexanediol, 0.02 parts by weight of dibutyltin dilaurate T12, 2 parts of dicyclohexyl peroxydicarbonate (DCPD) as a free radical initiator, and 10 parts by weight of dimethylformamide (DMF) are mixed. Components A and C are prepared in the same manner. When used, 443.74 parts by weight of component A, 20.52 parts by weight of component B, and 20.6 parts by weight of component C are mixed at 0°C to obtain the PUR surface layer polyurethane resin.

[0099] The difference between Comparative Example 1 and Example 1 is that in the preparation method of component A of the silicone wear-resistant resin, 24 parts by weight of vinyl silicone oil Andisil Vs 1000 and 65.9 parts by weight of vinyl silicone oil Andisil Vs 400 are uniformly mixed to obtain component A.

[0100] Comparative Example 2 differs from Example 1 in that: in the preparation method of Component A of the PUR surface layer polyurethane resin, 80 parts by weight of polycaprolactone diol PD1-10 PCL1000 and 72 parts by weight of vinyl hydroxy silicone oil are placed in a reactor at 120°C and vacuum-dehydrated for 2 hours. 86.9 parts by weight of Wanhua MDI-100HL, 0.04 parts by weight of dibutyltin dilaurate T12, and 200 parts by weight of dimethylformamide (DMF) are then added. The temperature is adjusted to 80°C and the reaction is carried out for 2 hours. The -NCO content in the detection system stabilizes, thereby obtaining Component A. Components B and C are prepared in the same manner. When used, 438.94 parts by weight of Component A, 20.5 parts by weight of Component B, and 20.6 parts by weight of Component C are uniformly mixed at 0°C to obtain the PUR surface layer polyurethane resin.

[0101] Comparative Example 3 differs from Example 1 in that: Component B of the PUR surface layer polyurethane resin is prepared by uniformly mixing 10.64 parts by weight of 1,6-hexanediol, 2 parts of dicyclohexyl peroxydicarbonate (DCPD), a free radical initiator, 0.02 parts by weight of dibutyltin dilaurate T12, and 10 parts by weight of dimethylformamide (DMF). Components A and C are prepared by the same method. Upon use, 443.74 parts by weight of Component A, 20.66 parts by weight of Component B, and 20.6 parts by weight of Component C are uniformly mixed at 0°C to obtain the PUR surface layer polyurethane resin.

[0102] In step five of the preparation method of the wear-resistant and tensile-resistant power cable, the PUR surface polyurethane resin in step one is coated on the surface of the TPEE sheath layer 4, placed at 70°C for curing for 120 minutes, and the outer wall of the TPEE sheath layer 4 is cured to form a PUR primer layer 5 with a thickness of 600 microns. Subsequently, the silicone wear-resistant resin in step one is coated on the surface of the PUR primer layer 5, placed at 105°C for curing for 30 minutes, and the outer wall of the surface of the PUR primer layer 5 is cured to form a silicone wear-resistant composite layer 6 with a thickness of 200 microns. The finished product can be obtained by winding.

[0103] Performance testing:

[0104] 1. Tensile strength test: Apply 500kg pulling force to both ends of the wire for 10s. Unload the pulling force after 10s, remove the protective layer and observe whether the copper wire of the wire is broken.

[0105] 2. Drag chain test: The bending radius is 6 times the outer diameter of the wire, the bending repetition rate is 88m / min, and it is subjected to 5 million reciprocating motions. Observe whether the cable core wire has any problems such as open circuit or short circuit, and observe whether the outer surface of the power cable has any problems such as cracks or bulging.

[0106] 3. Wear resistance: According to ASTM D4060-07, standard test method for determining the resistance of organic coatings using a Taber abrader, the wear resistance of the organic silicon wear-resistant composite layer on the test film formed by TPEE film / PUR primer / organic silicon wear-resistant composite layer was tested, and the abrasion loss was less than 0.05 mg / cm 2 If there is no bulging problem between the test films formed by the PUR base coating / silicone wear-resistant composite layer, it is qualified; otherwise, it is unqualified.

[0107] Table 1: Test parameters of cables in Examples 1-10 and Comparative Examples 1-3

[0108]

[0109] Table 2: Test parameters of the silicone wear-resistant composite layer in Examples 1-10 and Comparative Examples 1-3

[0110]

[0111] Combining Example 1 with Comparative Example 1 and Tables 1-2 shows that the addition of vinylsilane-modified nano-molybdenum disulfide improves the wear resistance of the organic silicon wear-resistant composite layer, thereby imparting excellent wear resistance to the power cable. Combining Example 1 with Comparative Example 2 and Tables 1-2 shows that the PUR primer layer and the organic silicon wear-resistant composite layer have good bonding strength and stability, imparting to the power cable excellent wear resistance and weather resistance, as well as excellent tensile mechanical properties and insulation safety.

[0112] It should be noted that this specific embodiment is merely an explanation of the technical solution of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A wear-resistant and tensile-resistant power cable, characterized by: The invention comprises a plurality of cable cores (1), an elastic inner sheath (2), an insulating tensile composite layer (3) arranged outside the elastic inner sheath (2) from the inside to the outside, a TPEE sheath layer (4), a PUR primer (5), and an organic silicon wear-resistant composite layer (6), wherein the cable core (1) is located in the elastic inner sheath (2); a reinforcing wire (20) is arranged in the elastic inner sheath (2); the polymer main chain of the PUR primer (5) contains active double bonds; the organic silicon wear-resistant composite layer (6) is made of a wear-resistant organic silicon resin, and the wear-resistant organic silicon resin is composed of a component A and a component B, wherein the component A comprises vinyl silicone oil and vinyl silane-modified nano-molybdenum disulfide; the component B comprises hydrogen-containing silicone oil and a platinum catalyst; the amount of vinyl silane-modified nano-molybdenum disulfide added to the organic silicon wear-resistant composite layer (6) is 5-10wt%; and the organic silicon wear-resistant composite layer (6) is connected to the PUR primer (5) through a chemical bond.

2. The wear-resistant and tensile-resistant power cable according to claim 1, characterized in that: The elastic inner sheath (2) comprises an elastic support frame (21) and an elastic inner ring sleeve (22), and the reinforcing wire (20) is coaxially arranged in the elastic support frame (21); the outer wall of the elastic support frame (21) is integrally formed with a plurality of embedded grooves A (211); the inner wall of the elastic inner ring sleeve (22) is integrally formed with a plurality of embedded grooves B (221); the embedded grooves A (211) of the elastic support frame (21) and the embedded grooves B (221) of the elastic inner ring sleeve (22) form a cable core filling groove (10); the cable core (1) is filled in the cable core filling groove (10) of the elastic inner sheath (2).

3. The wear-resistant and tensile-resistant power cable according to claim 1, characterized in that: The PUR primer (5) is made of a PUR surface layer polyurethane resin, and the PUR surface layer polyurethane is made of component A, component B, and component C. The component A is a -NCO-terminated polyurethane prepolymer, and the component A comprises diisocyanate, polyester polyol, side chain grafted vinyl modified dihydroxy-terminated silicone oil, an organic tin catalyst, and a highly polar aprotic solvent. The molar amount of -NCO in the diisocyanate is 1.4-1.6 times the sum of the molar amounts of hydroxyl groups in the polyester polyol and the side chain grafted vinyl modified dihydroxy-terminated silicone oil; the component B is composed of a chain extender, a free radical initiator, an organic tin catalyst, and a highly polar aprotic solvent; the ratio of the molar amount of active hydrogen in the chain extender to the molar amount of -NCO in the component A is (0.8-1):1; and the component C is an aminosilane-modified filler.

4. The wear-resistant and tensile-resistant power cable according to claim 3, characterized in that: The molar ratio of the polyester polyol to the side chain grafted vinyl modified dihydroxy terminated silicone oil is 1:(0.8-1.2).

5. The wear-resistant and tensile-resistant power cable according to claim 3, characterized in that: The chain extender is composed of maleic acid diamine and small molecule diol; the small molecule diol is at least one of 1,4-butanediol, 1,6-hexanediol, 1,3-propylene glycol, and 1,5-pentanediol; the molar ratio of the maleic acid diamine to the small molecule diol is 1:(1-3).

6. The wear-resistant and tensile-resistant power cable according to claim 3, characterized in that: The free radical initiator is at least one of dicumyl peroxide, dicyclohexyl peroxydicarbonate, benzoyl peroxide, and tert-butyryl peroxide.

7. The wear-resistant and tensile-resistant power cable according to claim 3, characterized in that: The aminosilane modified filler is made of aminosilane and ultrafine inorganic filler; the aminosilane is one or more combinations of γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane; the ultrafine inorganic filler is at least one of calcium carbonate, aluminum oxide, titanium dioxide, barium sulfate, mica powder, kaolin, and attapulgite with a particle size of less than 10 microns.

8. The wear-resistant and tensile-resistant power cable according to claim 1, characterized in that: The insulating tensile composite layer (3) is composed of an insulating tensile S layer and an insulating tensile Z layer. The insulating tensile S layer is made by impregnating resin and continuous fibers through a winding molding process, and the continuous fibers in the insulating tensile S layer are wound clockwise; the insulating tensile Z layer is made by impregnating resin and continuous fibers through a winding molding process, and the continuous fibers in the insulating tensile Z layer are wound counterclockwise; the continuous fibers in the insulating tensile composite layer (3) are selected from high-strength S glass fibers or low-dielectric D glass fibers.

9. The wear-resistant and tensile-resistant power cable according to claim 1, characterized in that: The reinforcing wire (20) is any one of a glass fiber composite wire, an aramid composite wire, and a UHMWPE fiber composite wire.

10. A method for preparing the wear-resistant and tensile-resistant power cable according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Prepare an elastic support frame (21) of a coaxial filling reinforcement wire (20) by an extrusion molding process; and simultaneously configure a PUR surface layer polyurethane resin and a wear-resistant silicone resin; Step 2: The cable core (1) is embedded in the embedding groove A (211) of the elastic support frame (21), and the TPEE resin melt material is compounded on the outer wall of the elastic support frame (21) by an extrusion molding process. The elastic inner ring sleeve (22) is compounded on the outer wall of the elastic support frame (21) to obtain the elastic inner sheath (2); Step 3: The elastic inner sheath (2) is wound clockwise around the continuous fiber impregnated with the impregnating resin by a winding molding process to solidify to form an insulating tensile-resistant S layer, and then the insulating tensile-resistant S layer is wound counterclockwise around the continuous fiber impregnated with the impregnating resin by a winding molding process to solidify to form an insulating tensile-resistant Z layer, that is, the elastic inner sheath (2) forms an insulating tensile-resistant composite layer (3) to obtain a semi-finished cable; Step 4: Compounding the TPEE resin melt material on the outer wall of the semi-finished cable through an extrusion molding process, and naturally cooling it to room temperature to compound the TPEE sheath layer (4) on the semi-finished cable; Step 5: Apply PUR surface polyurethane resin to the surface of TPEE sheath layer (4), place it at 60-75°C for curing for 30-60 minutes, then apply wear-resistant silicone resin, place it at 120-140°C for curing for 15-60 minutes to obtain the finished wear-resistant and tensile-resistant power cable.

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