High-strength wear-resistant protective material for power cable and preparation method thereof

Abstract

The invention discloses a high-strength wear-resistant protective material for a power cable and a preparation method of the high-strength wear-resistant protective material, and relates to the technical field of preparation of wear-resistant materials. The composite material is prepared from 40-60 parts of polyether-ether-ketone resin, 15-25 parts of silicon carbide whiskers, 10-20 parts of basalt fibers, 5-10 parts of a silane coupling agent, 3-8 parts of a lubricant, 2-6 parts of an antioxidant, 1-3 parts of nano titanium dioxide, 0.5-2 parts of a rare earth compound, 1-3 parts of boron nitride nanotubes, 0.5-2 parts of graphene nanoplatelets and 1-2 parts of fluororubber micro powder. The length-diameter ratio of the silicon carbide whiskers is 50-100, the diameter of the basalt fibers is 5-15 microns, the pipe diameter of the boron nitride nanotubes is 5-20 nm, the length of the boron nitride nanotubes is 100-500 nm, the thickness of the graphene microchips is 1-5 nm, and the sheet diameter of the graphene microchips is 1-10 microns. The tensile strength of the material is not lower than 150 MPa, the shore hardness is not lower than D85, the abrasion loss is low, the insulativity is good, the weather resistance and the chemical corrosion resistance are good, a special preparation process is adopted, and the performance is optimized; the cable sheath can be used for protecting various power cables and prolonging the service life of the cables.

Description

Technical Field

[0001] The present invention relates to the technical field of wear-resistant material preparation, and specifically relates to a high-strength wear-resistant protective material for power cables and a preparation method thereof. Background Art

[0002] In the field of modern materials science and engineering, ceramic aluminum alloys have attracted much attention due to their unique combination of properties. Ceramic aluminum alloys combine the excellent properties of ceramics (such as high hardness, high wear resistance, high heat resistance, etc.) with the advantages of aluminum alloys (such as low density, good processability and relatively high toughness), showing broad application prospects in many key application fields. However, it is not easy to achieve high performance of ceramic aluminum alloys, and its preparation process faces many technical challenges. The traditional preparation process of ceramic aluminum alloys has largely limited the further improvement of material properties. For example, in conventional casting processes, due to the differences in physical and chemical properties between the ceramic phase and the aluminum alloy phase, the dispersion of ceramic particles in the aluminum alloy melt is difficult to ensure. Ceramic particles usually have high surface energy, which makes them prone to agglomeration in the alloy melt, thereby affecting the microstructural uniformity of the material. When agglomeration occurs, a local stress concentration area will be formed inside the material, which is a weak point where the material is easily damaged when subjected to force, seriously affecting the mechanical properties and service life of the material. Moreover, the interface bonding problem between the ceramic phase and the aluminum alloy phase has always been an important problem that has troubled researchers. If the interface bonding is poor, interface debonding may occur when bearing external loads, greatly weakening the material's bearing capacity. In addition, the alloy structure formed by the traditional casting process is often coarse, and it is difficult to achieve fine control of the microstructure, which is an obvious defect for high-end application fields that require high-performance materials (such as aerospace, automotive engine components, high-performance mechanical structural parts, etc.). Although the powder metallurgy method can have a more precise control over the distribution of ceramic particles and alloy structure to a certain extent, the method also has its own limitations. On the one hand, powder metallurgy requires raw materials to be made into powder, which involves the preparation, storage and processing of powders, and has extremely harsh environmental requirements. In addition, the powder is easy to oxidize, and impurities may be introduced during the storage process, thereby increasing the production cost and process complexity. On the other hand, the sintering step in the powder metallurgy process will produce pores, which will affect the density of the material, resulting in the performance of the final product not reaching the ideal level. Although some existing solid phase rheology processes have achieved certain results in the preparation of some metal materials, their application in ceramic aluminum alloys is not mature enough. There are still many unresolved key issues in the melt solid phase rheological process of ceramic aluminum alloys, such as the lack of precision in controlling the rheological behavior of the melt, which makes it difficult to ensure the uniform distribution and microstructure refinement of ceramic particles in the semi-solid state. In addition, the existing technology lacks systematic optimization for the entire process from alloy raw material processing to final forming, and cannot achieve efficient, stable and repeatable production. With the continuous development of industry, the demand for high-performance ceramic aluminum alloys is increasing, which not only requires the material to have comprehensive properties such as high strength, high toughness, and high heat resistance, but also expects efficient, low-cost and stable production to be achieved during the preparation process.However, the current preparation techniques are difficult to meet these requirements. Therefore, there is an urgent need to develop a more advanced solid-state rheological process for the aluminum-titanium alloy melt, which can overcome the various drawbacks of the existing technologies, precisely control the dispersion and interfacial bonding of ceramic particles, optimize the microstructure of the alloy, achieve breakthroughs in material properties, and at the same time improve production efficiency and process stability to meet the requirements of modern high-end manufacturing for high-performance materials. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the present invention provides a high-strength wear-resistant protective material for power cables and a preparation method thereof.

[0005] (2) Technical Solutions

[0006] A preparation method of a high-strength wear-resistant protective material for power cables is made from the following raw materials by mass: 40-60 parts of polyetheretherketone resin, 15-25 parts of silicon carbide whiskers, 10-20 parts of basalt fibers, 5-10 parts of silane coupling agent, 3-8 parts of lubricant, 2-6 parts of antioxidant, 1-3 parts of nano-titanium dioxide, 0.5-2 parts of rare earth compound, 1-3 parts of boron nitride nanotubes, 0.5-2 parts of graphene microflakes, and 1-2 parts of fluororubber micropowder; the aspect ratio of the silicon carbide whiskers is 50-100, the diameter of the basalt fibers is 5-15 μm, the diameter of the boron nitride nanotubes is 5-20 nm, the length is 100-500 nm, the thickness of the graphene microflakes is 1-5 nm, and the sheet diameter is 1-10 μm.

[0007] Furthermore, it also includes surface treatment of the silicon carbide whiskers. First, the surface is roughened by acid-base etching, and then electroless nickel plating is carried out with a coating thickness of 10-50 nm to enhance the bonding force with the polyetheretherketone resin; the basalt fibers are treated by the synergistic effect of low-temperature plasma and ultraviolet light. Under an argon atmosphere, plasma treatment is carried out at a power of 100-200 W for 5-15 min, and at the same time, ultraviolet light irradiation is carried out for 10-20 min.

[0008] Furthermore, the silane coupling agent is a compound prepared by mixing γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-glycidyletheroxypropyltrimethoxysilane in a mass ratio of 3:2:1; the lubricant is a compound prepared by mixing molybdenum disulfide, polytetrafluoroethylene micropowder, and graphite powder in a mass ratio of 2:2:1; the antioxidant is a compound prepared by mixing hindered phenol antioxidant 1076, phosphite antioxidant 168, and thioester antioxidant DSTDP in a mass ratio of 2:1:1; the rare earth compound is a compound prepared by mixing lanthanum oxide and yttrium oxide in a mass ratio of 1:1.

[0009] Furthermore, it includes the following steps:

[0010] S1. First, dry silicon carbide whiskers, basalt fibers, nano-titanium dioxide, rare earth compounds, boron nitride nanotubes, graphene microflakes, and fluororubber micropowder at 100 - 150 °C for 2 - 4 h;

[0011] S2. Mix the dried materials with a silane coupling agent in a high-speed mixer at 800 - 1200 r / min for 15 - 25 min, and simultaneously perform surface modification using ultrasonic assistance with an ultrasonic frequency of 25 - 35 kHz and an ultrasonic power of 150 - 250 W;

[0012] S3. Add polyetheretherketone resin, modified fillers, lubricants, and antioxidants to a twin-screw extruder, and melt-blend and extrude into pellets at 350 - 400 °C. During the extrusion process, apply a transverse magnetic field of 0.3 - 0.8 T and an ultrasonic vibration of 1 - 3 kHz.

[0013] Furthermore, when melt-blending in the twin-screw extruder, adopt gradient temperature control. The temperature of zone 1 is 350 - 360 °C, the temperature of zone 2 is 360 - 370 °C, the temperature of zone 3 is 370 - 380 °C, the temperature of zone 4 is 380 - 390 °C, and the temperature of zone 5 is 390 - 400 °C.

[0014] Furthermore, the length-diameter ratio of the screw of the twin-screw extruder is 35 - 45:1, the screw speed is 180 - 280 r / min, and secondary pelletizing is performed after extrusion pelletizing. When performing secondary pelletizing, introduce inert gas helium into the pelletizer with a gas flow rate of 5 - 10 L / min.

[0015] Furthermore, it also includes injection molding the pelletized materials. The injection temperature is 360 - 410 °C, the injection pressure is 80 - 120 MPa, the holding pressure time is 10 - 20 s, and a micro-nano structured textured surface is set inside the injection mold with a texture depth of 10 - 50 μm.

[0016] Furthermore, first keep the product at 200 - 250 °C for 3 - 6 h, then cool it to room temperature at a rate of 1 - 3 °C / min, and then perform electron beam irradiation treatment with an irradiation dose of 10 - 30 kGy.

[0017] Furthermore, the tensile strength of the material is not less than 150 MPa, the Shore hardness is not less than D85, the abrasion loss is not higher than 0.03 cm 3 / 1.61 km, the volume resistivity is not less than 10 14 Ω·cm, and it has weather resistance and chemical corrosion resistance.

[0018] Furthermore, the material is used for the protection of power cables in different environments such as overhead cables, underground cables, and submarine cables, and is also used for the protection of cable joints and terminals.

[0019] (III) Beneficial Technical Effects

[0020] Compared with the existing technologies, the beneficial effects of the present invention are as follows:

[0021] Firstly, in terms of material properties, through a series of innovative process improvements, the problems of ceramic particle dispersion and interfacial bonding are effectively solved. For example, when adding ceramic particles, pulse addition and surface modification treatment are adopted, significantly improving the dispersion uniformity of ceramic particles, reducing agglomeration and local stress concentration, enhancing the mechanical properties of the material, and ensuring the structural integrity and reliability of the material. Adding rare earth elements and carbon nanotubes to the alloy, as well as adopting a unique solid-phase rheological treatment method, further refines the microstructure. The tensile strength of the alloy is not less than 400 MPa, and the yield strength is not less than 300 MPa, significantly improving the comprehensive performance of the material and meeting the demanding application environment.

[0022] Secondly, in terms of production efficiency and cost control, this process demonstrates advantages. Such as the pressure casting of multi-cavity molds and the special structural design of extrusion molds, which can achieve efficient batch production while reducing production costs. Ultrasonic vibration-assisted casting and optimized stirring methods improve the filling ability of the melt, reduce defects, and increase the product yield.

[0023] Furthermore, the precise control and optimization of the process bring better microstructure and performance stability. The online monitoring system combined with the computer control system can adjust the process parameters in real time, ensuring the repeatability and stability of the process.

[0024] In addition, the application of heat treatment and cryogenic treatment refines the microstructure, eliminates residual stress, and further improves the wear resistance and fatigue resistance of the material. The entire process is carried out under the protection of inert gas and adding active gas components, ensuring the quality of the material, making the performance of the material more stable between different batches, providing strong technical support for the wide application of high-performance ceramic aluminum alloy in many fields, and promoting the progress of material technology in the high-end manufacturing field.

[0025] With the continuous development of the power industry, the requirements for cable protection materials are becoming increasingly stringent. The present invention meets the current and future market demands with its innovative formula and advanced preparation process. It can not only ensure the stable supply of electricity but also reduce maintenance costs, and is expected to promote technological innovation in the field of power infrastructure protection and contribute to the construction of a safer and more efficient power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic flow diagram of a high-strength wear-resistant protection material for power cables and its preparation method. DETAILED DESCRIPTION OF THE INVENTION

[0027] Reference Figure 1, the specific implementation manners of the present invention are as follows:

[0028] Example 1:

[0029] Raw material preparation: Weigh the following raw materials by mass parts: 40 parts of polyether ether ketone resin, 15 parts of silicon carbide whiskers (aspect ratio 50 - 100), 10 parts of basalt fibers (diameter 5 - 15 μm), 5 parts of silane coupling agent (γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-glycidoxypropyltrimethoxysilane are compounded by a mass ratio of 3:2:1), 3 parts of lubricant (molybdenum disulfide, polytetrafluoroethylene micropowder, and graphite powder are compounded by a mass ratio of 2:2:1), 2 parts of antioxidant (hindered phenolic antioxidant 1076, phosphite antioxidant 168, and thioester antioxidant DSTDP are compounded by a mass ratio of 2:1:1), 1 part of nano-titanium dioxide, 0.5 part of rare earth compound (lanthanum oxide and yttrium oxide are compounded by a mass ratio of 1:1), 1 part of boron nitride nanotubes (tube diameter 5 - 20 nm, length 100 - 500 nm), 0.5 part of graphene microflakes (thickness 1 - 5 nm, flake diameter 1 - 10 μm), and 1 part of fluororubber micropowder.

[0030] Filler treatment: Silicon carbide whisker treatment: First, soak the silicon carbide whiskers in a dilute hydrochloric acid solution for 30 minutes for pickling, then rinse them with deionized water, and then soak them in a sodium hydroxide solution for 30 minutes for alkali washing. After rinsing, perform electroless nickel plating, and control the coating thickness at 10 - 15 nm.

[0031] Basalt fiber treatment: Put the basalt fibers into a low-temperature plasma treatment device, treat them for 15 minutes under an argon atmosphere with a power of 100 W, and at the same time turn on the ultraviolet irradiation device to irradiate for 20 minutes.

[0032] Boron nitride nanotube treatment: Add the boron nitride nanotubes to a solution containing an amination reagent, and react at 60 °C for 6 hours to make the surface amino content reach 2% - 3%.

[0033] Drying: Put the treated silicon carbide whiskers, basalt fibers, nano-titanium dioxide, rare earth compound, boron nitride nanotubes, graphene microflakes, and fluororubber micropowder into an oven and dry them at 100 °C for 4 hours.

[0034] Surface modification: Add the dried materials and the silane coupling agent to a high-speed mixer, stir and mix them at a speed of 800 r / min for 25 minutes, and at the same time turn on the ultrasonic assistance device with an ultrasonic frequency of 25 kHz and an ultrasonic power of 150 W.

[0035] Melt blending: Add polyetheretherketone resin, modified filler, lubricant and antioxidant into a twin-screw extruder. The length-diameter ratio of the twin-screw extruder is 35:1, and the screw rotation speed is 180 r / min. Gradient temperature control is adopted, with the temperature of zone 1 being 350 °C, zone 2 being 360 °C, zone 3 being 370 °C, zone 4 being 380 °C, and zone 5 being 390 °C. Apply a transverse magnetic field of 0.3 T and ultrasonic vibration of 1 kHz during the extrusion process for melt blending and pelletizing.

[0036] Secondary pelletizing: Put the particles after primary pelletizing into a pelletizer, introduce helium gas with a gas flow rate of 5 L / min for secondary pelletizing.

[0037] Injection molding: Inject the pelletized material. The injection temperature is 360 °C, the injection pressure is 80 MPa, and the holding pressure time is 20 seconds. A texture surface with micro-nano structure is set inside the injection mold, and the texture depth is 10 - 20 μm.

[0038] Post-treatment: After injection molding, keep the product at 200 °C for 6 hours, then cool it to room temperature at a rate of 1 °C / min, and then conduct electron beam irradiation treatment with an irradiation dose of 10 kGy.

[0039] Example 2:

[0040] Raw material preparation: Weigh 50 parts of polyetheretherketone resin, 20 parts of silicon carbide whiskers, 15 parts of basalt fibers, 7 parts of silane coupling agent, 5 parts of lubricant, 4 parts of antioxidant, 2 parts of nano-titanium dioxide, 1.2 parts of rare earth compound, 2 parts of boron nitride nanotubes, 1.2 parts of graphene microflakes and 1.5 parts of fluororubber micropowder.

[0041] Filler treatment: Silicon carbide whisker treatment: Prolong the acid-base etching time to 40 minutes each, and control the thickness of the electroless nickel plating layer at 25 - 30 nm.

[0042] Basalt fiber treatment: Adjust the plasma treatment power to 150 W, treat for 10 minutes, and irradiate with ultraviolet light for 15 minutes.

[0043] Boron nitride nanotube treatment: Raise the reaction temperature to 70 °C and the reaction time to 8 hours to make the surface amino group content reach 3% - 4%.

[0044] Drying: Dry at 125 °C for 3 hours.

[0045] Surface modification: Stir and mix at 1000 r / min for 20 minutes, with an ultrasonic frequency of 30 kHz and a power of 200 W.

[0046] Melt blending: The length-diameter ratio of the screw is 40:1, and the screw rotation speed is 230 r / min. The temperature of the first zone is 355 °C, the second zone is 365 °C, the third zone is 375 °C, the fourth zone is 385 °C, and the fifth zone is 395 °C. Apply a 0.5 T transverse magnetic field and 2 kHz ultrasonic vibration.

[0047] Secondary pelletizing: The helium flow rate is 7 L / min.

[0048] Injection molding: The injection temperature is 385 °C, the injection pressure is 100 MPa, the holding pressure is 15 seconds, and the mold texture depth is 25 - 35 μm.

[0049] Post-treatment: Keep warm at 225 °C for 4.5 hours, the cooling rate is 2 °C / min, and the electron beam irradiation dose is 20 kGy.

[0050] Example 3:

[0051] Raw material preparation: Weigh 60 parts of polyetheretherketone resin, 25 parts of silicon carbide whiskers, 20 parts of basalt fibers, 10 parts of silane coupling agent, 8 parts of lubricant, 6 parts of antioxidant, 3 parts of nano-titanium dioxide, 2 parts of rare earth compound, 3 parts of boron nitride nanotubes, 2 parts of graphene microflakes, and 2 parts of fluororubber micropowder.

[0052] Filler treatment: Silicon carbide whisker treatment: Acid and alkali etching for 50 minutes each, and the nickel plating layer thickness is 40 - 50 nm.

[0053] Basalt fiber treatment: Plasma treatment at 200 W for 5 minutes and ultraviolet irradiation for 10 minutes.

[0054] Boron nitride nanotube treatment: React at 80 °C for 10 hours, and the amino group content is 4% - 5%.

[0055] Drying: Dry at 150 °C for 2 hours.

[0056] Surface modification: Stir at 1200 r / min for 15 minutes, ultrasonic frequency 35 kHz, power 250 W.

[0057] Melt blending: The length-diameter ratio of the screw is 45:1, and the screw rotation speed is 280 r / min. The temperature of the first zone is 360 °C, the second zone is 370 °C, the third zone is 380 °C, the fourth zone is 390 °C, and the fifth zone is 400 °C. Apply a 0.8 T transverse magnetic field and 3 kHz ultrasonic vibration.

[0058] Secondary pelletizing: The helium flow rate is 10 L / min.

[0059] Injection molding: The injection temperature is 410 °C, the injection pressure is 120 MPa, the holding pressure is 10 seconds, and the mold texture depth is 40 - 50 μm.

[0060] Post-treatment; Keep warm at 250 °C for 3 hours, the cooling rate is 3 °C / min, and the electron beam irradiation dose is 30 kGy.

[0061] Comparative Example:

[0062] Raw material preparation: Weigh 50 parts of polyetheretherketone resin, 20 parts of ordinary silicon carbide powder, 15 parts of glass fiber, 5 parts of γ-aminopropyltriethoxysilane, 5 parts of molybdenum disulfide, and 3 parts of hindered phenol antioxidant 1076.

[0063] Mixing and pelletizing: Directly add the raw materials into a twin-screw extruder, without performing surface treatment of the filler and special process operations, and melt-blend and extrude into pellets at 380°C.

[0064] Injection molding: Keep the pressure of the pelletized material at 100 MPa for 15 seconds at 380°C for injection molding.

[0065] Performance testing: Perform performance testing on the materials prepared in Examples 1-3 and the comparative example. The results are as follows:

[0066]

[0067]

[0068] It can be seen from the test results that the high-strength wear-resistant protective material for power cables prepared in the examples is significantly superior to the comparative example in terms of tensile strength, Shore hardness, wear resistance, insulation performance, weather resistance, and chemical corrosion resistance. This proves that the material formula and preparation process of the present invention have significant advantages, can effectively improve the performance of power cable protective materials, and extend the service life of cables.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength wear-resistant protective material for power cables, characterized in that: The invention is prepared from the following raw materials, in parts by mass: 40-60 parts of polyetheretherketone resin, 15-25 parts of silicon carbide whiskers, 10-20 parts of basalt fibers, 5-10 parts of silane coupling agents, 3-8 parts of lubricants, 2-6 parts of antioxidants, 1-3 parts of nano titanium dioxide, 0.5-2 parts of rare earth compounds, 1-3 parts of boron nitride nanotubes, 0.5-2 parts of graphene microsheets and 1-2 parts of fluororubber micropowder; the aspect ratio of the silicon carbide whiskers is 50-100, the diameter of the basalt fibers is 5-15 μm, the diameter of the boron nitride nanotubes is 5-20 nm and the length is 100-500 nm, the thickness of the graphene microsheets is 1-5 nm and the diameter of the microsheets is 1-10 μm.

2. The high-strength wear-resistant protective material for power cables according to claim 1, characterized in that: It also includes surface treatment of silicon carbide whiskers, first roughening the surface by acid-base etching, and then chemically plating nickel with a coating thickness of 10-50nm to enhance the bonding strength with polyetheretherketone resin; low-temperature plasma and ultraviolet synergistic treatment of basalt fiber, plasma treatment for 5-15 minutes at a power of 100-200W in an argon atmosphere, and irradiation with ultraviolet light for 10-20 minutes.

3. The high-strength wear-resistant protective material for power cables according to claim 1, characterized in that: The silane coupling agent is a compound of γ-aminopropyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane and γ-glycidyloxypropyltrimethoxysilane in a mass ratio of 3:2:1; the lubricant is a compound of molybdenum disulfide, polytetrafluoroethylene powder and graphite powder in a mass ratio of 2:2:1; the antioxidant is a compound of hindered phenol antioxidant 1076, phosphite antioxidant 168 and thioester antioxidant DSTDP in a mass ratio of 2:1:1; the rare earth compound is a compound of lanthanum oxide and yttrium oxide in a mass ratio of 1:

1.

4. A method for preparing the high-strength wear-resistant protective material for power cables according to any one of claims 1 to 3, characterized in that: The following steps are involved: First, silicon carbide whiskers, basalt fibers, nano-titanium dioxide, rare earth compounds, boron nitride nanotubes, graphene microsheets and fluororubber micropowders are dried at 100-150°C for 2-4 hours; the dried materials are mixed with a silane coupling agent in a high-speed mixer at 800-1200 r / min for 15-25 minutes, and ultrasonic assistance is used at a frequency of 25-35 kHz and a power of 150-250 W for surface modification; polyetheretherketone resin, modified fillers, lubricants and antioxidants are added to a twin-screw extruder, melt-blended and extruded for granulation at 350-400°C, and a transverse magnetic field of 0.3-0.8 T and ultrasonic vibration of 1-3 kHz are applied during the extrusion process.

5. The preparation method according to claim 4, characterized in that: During melt blending in the twin-screw extruder, gradient temperature control is adopted, with the temperature of zone 1 being 350-360°C, the temperature of zone 2 being 360-370°C, the temperature of zone 3 being 370-380°C, the temperature of zone 4 being 380-390°C, and the temperature of zone 5 being 390-400°C.

6. The preparation method according to claim 4, characterized in that: The screw length-diameter ratio of the twin-screw extruder is 35-45:1, the screw speed is 180-280r / min, and secondary granulation is performed after extrusion granulation. During the secondary granulation, inert gas helium is introduced into the granulator, and the gas flow rate is 5-10L / min.

7. The preparation method according to claim 4, characterized in that: The method also includes injection molding the granulated material, with an injection molding temperature of 360-410°C, an injection molding pressure of 80-120MPa, a holding time of 10-20s, and setting a micro-nano structured texture surface in the injection mold with a texture depth of 10-50μm.

8. The preparation method according to claim 7, characterized in that: After injection molding, heat treatment is performed. The product is first kept at 200-250°C for 3-6 hours, then cooled to room temperature at a rate of 1-3°C / min, and then subjected to electron beam irradiation treatment with an irradiation dose of 10-30kGy.

9. The high-strength wear-resistant protective material for power cables according to claim 1, characterized in that: The tensile strength of the material is not less than 150MPa, the Shore hardness is not less than D85, and the wear volume is not higher than 0.03cm 3 / 1.61km, volume resistivity not less than 10 14 Ω·cm, and has weather resistance and chemical corrosion resistance.

10. The high-strength wear-resistant protective material for power cables according to claim 1, characterized in that: The material is used for the protection of power cables in different environments such as overhead cables, underground cables and submarine cables, and is also used for the joint protection and terminal protection of power cables.

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