High-weather-resistance power cable

Abstract

The invention relates to the technical field of cables, and provides a high-weather-resistance power cable. The high-weather-resistant power cable comprises a cable core and an outer sheath, the outer sheath is prepared from the following raw materials in parts by weight: 40 to 50 parts of low-density polyethylene, 25 to 35 parts of ethylene-vinyl acetate copolymer, 20 to 30 parts of ethylene propylene diene monomer, 10 to 12 parts of maleic anhydride grafted ethylene-vinyl acetate copolymer, 16 to 20 parts of ZrO2 coated modified hydrotalcite, 15 to 20 parts of magnesium hydroxide, 4 to 6 parts of silane coupling agent, 2 to 3 parts of dicumyl peroxide and 3 to 5 parts of zinc oxide; 6 to 10 parts of conductive carbon black, 0.8 to 1 part of antioxidant and 1 to 1.5 parts of zinc stearate. According to the cable prepared in the invention, the protection performance, the service life and the safety of an existing high-weather-resistance power cable under extreme weather conditions are improved, and the mechanical property of the cable is also improved.

Description

Technical Field

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

[0002] Power cables play a vital role in modern power transmission and distribution systems, their primary function being to ensure the efficient and safe transmission of electrical energy. With technological advancements and society's growing demand for electricity, power cable technology continues to evolve and innovate. From early simple cables to today's high-performance cables with diverse performance characteristics, their evolution reflects a growing demand for greater reliability and adaptability in power transmission.

[0003] Although existing high-weather-resistant power cables use materials with certain weather resistance in parts such as the sheath, under some extreme climatic conditions, such as long-term exposure to high temperature and strong ultraviolet rays, the sheath material will still age, crack, and harden, resulting in a decrease in its protective performance, thereby affecting the overall service life and safety of the cable; in extremely cold environments, the sheath and insulation materials of some cables may become brittle, reducing the cable's tensile and impact resistance, and increasing the risk of cable breakage and short circuits.

[0004] In practical applications, power cables are often subjected to various mechanical stresses, such as stretching, compression, and bending. The mechanical strength of existing high-weather-resistant power cables is still less than ideal in some cases. In particular, when subjected to large external impacts or long-term high tension, problems such as conductor deformation, insulation damage, and sheath cracking are prone to occur, thereby affecting the normal operation of the cable and causing failures. This is especially true in situations where frequent laying and movement are required, as well as when the cable is being laid or used in complex geographical environments. In order to address the above technical problems, the present invention proposes a new high-weather-resistant power cable. Summary of the Invention

[0005] The present invention provides a high-weather-resistant power cable, which improves the protection performance, service life and safety of existing high-weather-resistant power cables under extreme climatic conditions and also improves their mechanical properties.

[0006] The technical solutions of the present invention are as follows: In the first aspect, the present invention proposes a highly weather-resistant power cable, comprising a cable core and an outer sheath, wherein the outer sheath is composed of the following raw materials in parts by weight: 40-50 parts of low-density polyethylene, 25-35 parts of ethylene-vinyl acetate copolymer, 20-30 parts of EPDM rubber, 10-12 parts of maleic anhydride grafted ethylene-vinyl acetate copolymer, 16-20 parts of ZrO2-coated modified hydrotalcite, 15-20 parts of magnesium hydroxide, 4-6 parts of silane coupling agent, 2-3 parts of dicumyl peroxide, 3-5 parts of zinc oxide, 6-10 parts of conductive carbon black, 0.8-1 part of antioxidant and 1-1.5 parts of zinc stearate.

[0007] The raw material formula of the outer sheath of this highly weather-resistant power cable adopts a synergistic combination of multiple materials. Low-density polyethylene, ethylene-vinyl acetate copolymer and EPDM rubber are used as base materials, each with unique performance advantages. Low-density polyethylene has good flexibility and electrical insulation, ethylene-vinyl acetate copolymer has good flexibility and resistance to environmental stress cracking, and EPDM rubber has excellent weather resistance, ozone resistance and chemical corrosion resistance. The three work synergistically, combining their respective advantages, so that the overall performance of the outer sheath is improved and can better adapt to different environmental conditions. Maleic anhydride grafted ethylene-vinyl acetate copolymer is used as a compatibilizer. The maleic anhydride groups on its molecular chain can chemically react or physically entangle with the base material and other functional fillers, enhance the interfacial bonding force between the components, and improve the overall performance of the material. The addition of this compatibilizer enables the components that may originally affect performance due to poor compatibility to work better together to form a uniform and stable overall structure.

[0008] As a further technical solution, the preparation method of the ZrO2-coated modified hydrotalcite includes: dissolving magnesium nitrate hexahydrate and aluminum nitrate nonahydrate in water, adding urea and sodium carbonate, stirring at 75-85°C for 5-6 hours, then performing a hydrothermal reaction, centrifuging, washing, and drying to obtain flaky LDH; dispersing the flaky LDH in a mixed solvent of ethanol and water, ultrasonically dispersing, adding an ethanol solution of zirconium acetylacetonate dropwise, stirring at a constant temperature of 55-65°C for 20-24 hours, adjusting the pH to 3.0±0.1 with nitric acid, and calcining after centrifugation to obtain the product.

[0009] As a further technical solution, the usage ratio of the magnesium nitrate hexahydrate, aluminum nitrate nonahydrate, water, urea and sodium carbonate is 100-110 g: 70-80 g: 450-550 mL: 175-185 g: 15-17 g.

[0010] As a further technical solution, the hydrothermal reaction temperature is 140-150° C. and the reaction time is 17-19 hours.

[0011] As a further technical solution, the usage ratio of the flaky LDH, the mixed solvent, the zirconium acetylacetonate and the ethanol is 40-46 g: 500-600 mL: 6-7 g: 160-180 mL.

[0012] As a further technical solution, the mixed solvent is ethanol and water in a volume ratio of 3:1.

[0013] As a further technical solution, the calcination conditions are: calcining in a nitrogen atmosphere at a temperature of 2°C / min to 450-550°C for 2-3h.

[0014] As a further technical solution, the antioxidant includes antioxidant 1010 and / or antioxidant 168.

[0015] As a further technical solution, the preparation steps include: weighing raw materials according to the formula, mixing low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, maleic anhydride grafted ethylene-vinyl acetate copolymer and silane coupling agent at 95-105°C and 200-300rpm for 5-10 minutes; then adding other raw materials for the outer sheath, ZrO2-coated modified hydrotalcite, magnesium hydroxide, zinc oxide, conductive carbon black, antioxidant and zinc stearate, mixing at 90-100°C for 15-25 minutes, cooling to 60-80°C, adding dicumyl peroxide and mixing for 1-3 minutes, adding the mixed materials into a twin-screw extruder, controlling the head temperature to 105-115°C, extruding and coating the cable core surface to form an outer sheath, and then cross-linking to obtain the said high weather-resistant power cable.

[0016] As a further technical solution, the cross-linking is performed by steam vulcanization at a temperature of 180-200° C. and a pressure of 1-1.5 MPa for 10-15 minutes.

[0017] The working principle and beneficial effects of the present invention are: The present invention combines a ZrO2-coated modified hydrotalcite with magnesium hydroxide to significantly improve the flame retardancy of the cable. Magnesium hydroxide absorbs heat and releases water vapor when thermally decomposed, diluting combustible gases and providing cooling. The ZrO2-coated modified hydrotalcite forms a dense zirconium oxide protective layer at high temperatures, which not only prevents further heat transfer but also effectively blocks the diffusion of oxygen and combustible gases. The synergistic effect of these two factors: the decomposition of magnesium hydroxide absorbs heat and releases water vapor, reducing the temperature and combustible gas concentration in the combustion zone. Furthermore, the ZrO2 coating prevents further contact between oxygen and combustible gases, significantly improving the flame retardancy of the cable.

[0018] The ZrO2-coated modified hydrotalcite in the present invention has high strength and rigidity. When evenly dispersed in a matrix material, it can withstand certain external forces, enhancing the material's mechanical properties. Furthermore, the ZrO2 coating improves the interfacial compatibility between the hydrotalcite and the matrix material, allowing for better bonding between the hydrotalcite and the matrix material and reducing stress concentration. When subjected to mechanical stress, the matrix material transfers the stress to the ZrO2-coated modified hydrotalcite, with both materials sharing the stress. This improves the mechanical properties of the cable and reduces problems such as conductor deformation, insulation damage, and sheath cracking.

[0019] The ZrO2 coating in the present invention effectively shields against ultraviolet rays, preventing degradation and aging of the base material. The hydrotalcite itself has a specific layered structure that absorbs harmful substances in the environment, reducing their erosion of the base material. The two work synergistically: the ZrO2 coating blocks direct ultraviolet radiation, while the hydrotalcite's layered structure further absorbs and blocks harmful substances such as moisture and oxygen in the environment, thereby improving the cable's weather resistance and extending its service life. DETAILED DESCRIPTION

[0020] 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.

[0021] It should be noted that the low-density polyethylene in the present invention was purchased from PetroChina Jilin Petrochemical Company with the brand name DFDA-7042; ethylene-vinyl acetate copolymer, CAS number: 24937-78-8, MDL number: MFCD00133996, article number: P815474, was purchased from MacLean Reagent; EPDM rubber was purchased from Dow Chemical (China) Co., Ltd. with the brand name EPDM725P; maleic anhydride grafted ethylene-vinyl acetate copolymer was purchased from Nanjing Sutai Polymer Technology Co., Ltd.; the silane coupling agent used in the present invention is KH560.

[0022] Example 1 This embodiment provides a highly weather-resistant power cable, comprising a cable core and an outer sheath. The outer sheath is composed of the following raw materials in parts by weight: 45 parts of low-density polyethylene, 30 parts of ethylene-vinyl acetate copolymer, 25 parts of EPDM rubber, 11 parts of maleic anhydride-grafted ethylene-vinyl acetate copolymer, 18 parts of ZrO2-coated modified hydrotalcite, 17 parts of magnesium hydroxide, 5 parts of a silane coupling agent, 2.5 parts of dicumyl peroxide, 4 parts of zinc oxide, 8 parts of conductive carbon black, 0.9 parts of an antioxidant, and 1.2 parts of zinc stearate; the antioxidants are antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1. The preparation method of ZrO2-coated modified hydrotalcite includes: dissolving 105 g of magnesium nitrate hexahydrate and 75 g of aluminum nitrate nonahydrate in 500 mL of water, adding 180 g of urea and 16 g of sodium carbonate, stirring at 80°C for 5.5 h, then hydrothermally reacting at 145°C for 18 h, centrifuging and washing until neutral, and vacuum drying at 80°C for 12 h to obtain flaky LDH; 43 g of flaky LDH was dispersed in 550 mL of a mixed solvent of ethanol and water with a volume ratio of 3:1, and ultrasonicated at 300 W for 30 min. A solution prepared by adding 6.5 g of zirconium acetylacetonate and 170 mL of ethanol was added dropwise at a rate of 1 mL / min. The mixture was stirred at 60 ° C for 22 h. The pH was adjusted to 3.0 with nitric acid. After centrifugation, the mixture was heated to 500 ° C for 25 h in a nitrogen atmosphere at 2 ° C / min. The preparation steps include: weighing raw materials according to the formula, mixing low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, maleic anhydride grafted ethylene-vinyl acetate copolymer and silane coupling agent at 100°C and 250rpm for 8 minutes; then adding ZrO2-coated modified hydrotalcite, magnesium hydroxide, zinc oxide, conductive carbon black, antioxidant and zinc stearate, mixing at 95°C for 20 minutes, cooling to 70°C, adding dicumyl peroxide and mixing for 2 minutes, adding the mixed materials into a twin-screw extruder, controlling the head temperature to 110°C, extruding and coating on the cable core surface to form an outer sheath, and then steam vulcanizing and cross-linking at a temperature of 190°C and 1.2MPa for 12 minutes to obtain the said high weather-resistant power cable.

[0023] Example 2 This embodiment provides a highly weather-resistant power cable, comprising a cable core and an outer sheath. The outer sheath is composed of the following raw materials in parts by weight: 40 parts of low-density polyethylene, 25 parts of ethylene-vinyl acetate copolymer, 20 parts of ethylene propylene diene monomer rubber, 10 parts of maleic anhydride-grafted ethylene-vinyl acetate copolymer, 16 parts of ZrO2-coated modified hydrotalcite, 15 parts of magnesium hydroxide, 4 parts of a silane coupling agent, 2 parts of dicumyl peroxide, 3 parts of zinc oxide, 6 parts of conductive carbon black, 0.8 parts of an antioxidant, and 1 part of zinc stearate; the antioxidants are antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1. The preparation method of ZrO2-coated modified hydrotalcite includes: dissolving 100 g of magnesium nitrate hexahydrate and 70 g of aluminum nitrate nonahydrate in 450 mL of water, adding 175 g of urea and 15 g of sodium carbonate, stirring at 75°C for 5 h, then hydrothermally reacting at 140°C for 17 h, centrifuging and washing until neutral, and vacuum drying at 80°C for 12 h to obtain flaky LDH; 40 g of flaky LDH was dispersed in 500 mL of a mixed solvent of ethanol and water with a volume ratio of 3:1, and ultrasonicated at 300 W for 30 min. A solution of 6 g of zirconium acetylacetonate and 160 mL of ethanol was added dropwise at a rate of 1 mL / min. The mixture was stirred at 55 ° C for 20 h. The pH was adjusted to 3.0 with nitric acid. After centrifugation, the mixture was heated to 450 ° C for 2 h in a nitrogen atmosphere at 2 ° C / min. The preparation steps include: weighing raw materials according to the formula, mixing low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, maleic anhydride grafted ethylene-vinyl acetate copolymer and silane coupling agent at 95°C and 200rpm for 5 minutes; then adding ZrO2-coated modified hydrotalcite, magnesium hydroxide, zinc oxide, conductive carbon black, antioxidant and zinc stearate, mixing at 90°C for 15 minutes, cooling to 60°C, adding dicumyl peroxide and mixing for 1 minute, adding the mixed materials into a twin-screw extruder, controlling the head temperature to 105°C, extruding and coating on the cable core surface to form an outer sheath, and then steam vulcanizing and cross-linking at a temperature of 180°C and 1MPa for 10 minutes to obtain the said high weather-resistant power cable.

[0024] Example 3 This embodiment provides a highly weather-resistant power cable, comprising a cable core and an outer sheath. The outer sheath is composed of the following raw materials in parts by weight: 50 parts of low-density polyethylene, 35 parts of ethylene-vinyl acetate copolymer, 30 parts of ethylene propylene diene monomer rubber, 12 parts of maleic anhydride-grafted ethylene-vinyl acetate copolymer, 20 parts of ZrO2-coated modified hydrotalcite, 20 parts of magnesium hydroxide, 6 parts of a silane coupling agent, 3 parts of dicumyl peroxide, 5 parts of zinc oxide, 10 parts of conductive carbon black, 1 part of an antioxidant, and 1.5 parts of zinc stearate; the antioxidants are antioxidant 1010 and antioxidant 168 in a mass ratio of 2:1. The preparation method of ZrO2-coated modified hydrotalcite includes: dissolving 110 g of magnesium nitrate hexahydrate and 80 g of aluminum nitrate nonahydrate in 550 mL of water, adding 185 g of urea and 17 g of sodium carbonate, stirring at 85°C for 6 h, then hydrothermally reacting at 150°C for 19 h, centrifuging and washing until neutral, and vacuum drying at 80°C for 12 h to obtain flaky LDH; 46 g of flaky LDH was dispersed in 600 mL of a mixed solvent of ethanol and water with a volume ratio of 3:1, and ultrasonicated at 300 W for 30 min. A solution prepared by 7 g of zirconium acetylacetonate and 180 mL of ethanol was added dropwise at a rate of 1 mL / min. The mixture was stirred at 65 ° C for 24 h. The pH was adjusted to 3.0 with nitric acid. After centrifugation, the mixture was heated to 550 ° C for 3 h in a nitrogen atmosphere at 2 ° C / min. The preparation steps include: weighing raw materials according to the formula, mixing low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, maleic anhydride grafted ethylene-vinyl acetate copolymer and silane coupling agent at 105°C and 300rpm for 10 minutes; then adding ZrO2-coated modified hydrotalcite, magnesium hydroxide, zinc oxide, conductive carbon black, antioxidant and zinc stearate, mixing at 100°C for 25 minutes, cooling to 80°C, adding dicumyl peroxide and mixing for 3 minutes, adding the mixed materials into a twin-screw extruder, controlling the head temperature to 115°C, extruding and coating on the cable core surface to form an outer sheath, and then steam vulcanizing and cross-linking at a temperature of 200°C and 1.5MPa for 15 minutes to obtain the said high weather-resistant power cable.

[0025] Comparative Example 1 In this comparative example, the raw material for preparing the ZrO2-coated modified hydrotalcite is replaced by zinc nitrate hexahydrate, and the rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0026] Comparative Example 2 In this comparative example, the magnesium nitrate hexahydrate in the raw material for preparing the ZrO2-coated modified hydrotalcite is replaced by aluminum nitrate nonahydrate, and the rest is the same as that of comparative example 1, and the preparation steps are the same as those of comparative example 1.

[0027] Comparative Example 3 In this comparative example, the aluminum nitrate nonahydrate in the raw material for preparing the ZrO2-coated modified hydrotalcite is replaced by magnesium nitrate hexahydrate, and the rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0028] Comparative Example 4 In this comparative example, the ZrO2 coated modified hydrotalcite is replaced by hydrotalcite without ZrO2 coating modification, and the rest is the same as that of comparative example 1, and the preparation steps are the same as that of comparative example 1.

[0029] Comparative Example 5 In this comparative example, the ZrO2-coated modified hydrotalcite is replaced by ZrO2, and the rest is the same as in Example 1, and the preparation steps are the same as in Example 1.

[0030] Comparative Example 6 In this comparative example, no ZrO2-coated modified hydrotalcite was added to the raw materials, and the rest was the same as in Example 1, and the preparation steps were the same as in Example 1.

[0031] Test Example 1: The following tests were performed on the high weather-resistant power cable outer sheaths prepared in the aforementioned Examples 1-3 and Comparative Examples 1-6: Tensile strength: tested in accordance with GB / T2951.11-2008; Oxygen index (LOI) test: refer to GB / T 2406.2-2009 standard test; Vertical burning (UL94): Tested in accordance with GB / T 2408-2021 standard; UV aging: Place the sample in a xenon lamp aging box (wavelength 340nm, irradiation intensity 0.35W / m 2 , 60℃ black mark temperature, 50% relative humidity), cyclic irradiation treatment; test the tensile strength after aging and calculate the retention rate; Thermal oxidative aging: Place the sample in a hot air aging chamber at 100°C; test the tensile strength after aging and calculate the retention rate; Hygrothermal aging: place the sample in an environment of 85℃ / 85%RH; test the tensile strength after aging and calculate the retention rate; The test results are shown in Table 1 below: Table 1

[0032] Combined with the above, Examples 1-3 exhibited the best overall performance (tensile strength >17 MPa, LOI >33%, UL94 V-0 rating, and aging retention >83%), demonstrating that ZrO2-coated modified hydrotalcite is key to improving the cable's weather resistance, flame retardancy, and mechanical properties. Compounding with magnesium hydroxide significantly improved the oxygen index (LOI >33%) and achieved UL94 V-0 rating. Strength retention after UV, thermal oxygen, and wet heat aging was >83%, demonstrating that the ZrO2 coating effectively shields against UV rays and environmental corrosion.

[0033] Comparative Example 1 exhibits significantly reduced flame retardancy and aging retention, due to poor thermal stability and low flame retardancy efficiency of the zinc-based hydrotalcite. A weakened laminate structure leads to reduced mechanical and weatherability properties. Comparative Example 2 exhibits the lowest tensile strength and aging retention, as excessive aluminum disrupts the laminate charge balance, causing severe filler aggregation, poor dispersibility, and weak interfacial bonding. Comparative Example 3 performs better than Comparative Examples 1-2 but worse than Example 1. Excessive magnesium reduces the layer charge density, weakens the ion exchange capacity, and compromises the flame retardant synergistic effect. Comparative Example 4 exhibits the worst flame retardancy and aging retention of the uncoated hydrotalcite. This is because the uncoated hydrotalcite readily absorbs moisture and aggregates, resulting in a loss of UV shielding and significantly reduced weatherability and flame retardancy. Comparative Example 5, using only ZrO2, exhibits extremely low tensile strength and aging retention. ZrO2 alone exhibits poor compatibility with polymers and is difficult to disperse. The lack of barrier properties of the hydrotalcite laminate results in insufficient flame retardancy and mechanical properties. Comparative Example 6 exhibits degraded overall performance, demonstrating that this filler is an essential weathering and flame retardant synergist for the system.

[0034] 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 weather-resistant power cable, characterized in that: The cable comprises a cable core and an outer sheath, wherein the outer sheath is composed of the following raw materials in parts by weight: 40-50 parts of low-density polyethylene, 25-35 parts of ethylene-vinyl acetate copolymer, 20-30 parts of EPDM rubber, 10-12 parts of maleic anhydride grafted ethylene-vinyl acetate copolymer, 16-20 parts of ZrO2-coated modified hydrotalcite, 15-20 parts of magnesium hydroxide, 4-6 parts of silane coupling agent, 2-3 parts of dicumyl peroxide, 3-5 parts of zinc oxide, 6-10 parts of conductive carbon black, 0.8-1 part of antioxidant and 1-1.5 parts of zinc stearate.

2. A highly weather-resistant power cable according to claim 1, characterized in that: The preparation method of the ZrO2-coated modified hydrotalcite includes: dissolving magnesium nitrate hexahydrate and aluminum nitrate nonahydrate in water, adding urea and sodium carbonate, stirring at 75-85°C for 5-6 hours, then performing a hydrothermal reaction, centrifuging, washing, and drying to obtain flaky LDH; dispersing the flaky LDH in a mixed solvent of ethanol and water, ultrasonically dispersing, dropwise adding an ethanol solution of zirconium acetylacetonate, stirring at a constant temperature of 55-65°C for 20-24 hours, adjusting the pH to 3.0±0.1 with nitric acid, centrifuging, and calcining to obtain the ZrO2-coated modified hydrotalcite.

3. A highly weather-resistant power cable according to claim 2, characterized in that: The usage ratio of the magnesium nitrate hexahydrate, the aluminum nitrate nonahydrate, water, urea and sodium carbonate is 100-110 g: 70-80 g: 450-550 mL: 175-185 g: 15-17 g.

4. A highly weather-resistant power cable according to claim 2, characterized in that: The hydrothermal reaction temperature is 140-150° C. and the reaction time is 17-19 hours.

5. A highly weather-resistant power cable according to claim 2, characterized in that: The usage ratio of the flaky LDH, the mixed solvent, zirconium acetylacetonate and ethanol is 40-46 g: 500-600 mL: 6-7 g: 160-180 mL.

6. A highly weather-resistant power cable according to claim 2, characterized in that: The mixed solvent is ethanol and water in a volume ratio of 3:

1.

7. The highly weather-resistant power cable according to claim 2, characterized in that: The calcination conditions are as follows: heating to 450-550° C. at 2° C. / min in a nitrogen atmosphere and calcining for 2-3 hours.

8. The highly weather-resistant power cable according to claim 1, characterized in that: The antioxidant includes antioxidant 1010 and / or antioxidant 168.

9. The high weather-resistant power cable according to any one of claims 1 to 8, characterized in that: The preparation steps include: weighing raw materials according to the formula, mixing low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene propylene diene monomer rubber, maleic anhydride grafted ethylene-vinyl acetate copolymer and silane coupling agent at 95-105°C and 200-300rpm for 5-10min; then adding other raw materials for the outer sheath, ZrO2-coated modified hydrotalcite, magnesium hydroxide, zinc oxide, conductive carbon black, antioxidant and zinc stearate, kneading at 90-100°C for 15-25min, cooling to 60-80°C, adding dicumyl peroxide and kneading for 1-3min, adding the mixed materials into a twin-screw extruder, controlling the head temperature to 105-115°C, extruding and coating on the cable core surface to form an outer sheath, and then cross-linking to obtain the high weather-resistant power cable.

10. The highly weather-resistant power cable according to claim 1, characterized in that: The crosslinking is performed by steam vulcanization at a temperature of 180-200° C. and a pressure of 1-1.5 MPa for 10-15 minutes.

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