Anti-aging power cable and preparation method thereof

Abstract

The invention relates to the technical field of power cables, and provides an anti-aging power cable and a preparation method thereof. The aging-resistant power cable comprises a conductor, an insulating layer and a sheath layer from inside to outside, the sheath layer comprises the following components in parts by weight: 70-90 parts of ethylene propylene diene monomer, 20-30 parts of nitrile rubber, 12-15 parts of an ethylene-vinyl acetate copolymer, 3-7 parts of chlorosulfonated polyethylene, 3-5 parts of a coupling agent, 2-4 parts of a dispersant, 2-14 parts of zirconium-doped cerium oxide, 15-20 parts of a flame retardant, 1-3 parts of a plasticizer, 6-8 parts of a lubricant, 1.5-2.5 parts of a vulcanizing agent and 1-3 parts of a vulcanizing aid. According to the technical scheme, the problem that an anti-aging power cable in the prior art is insufficient in thermo-oxidative aging resistance is solved.

Description

Technical Field

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

[0002] Power cables are used for transmitting and distributing electrical energy, commonly found in critical applications such as urban underground power grids and power plant lead-out lines. When operating outdoors, these cables are exposed to sunlight for extended periods. The combined effect of light and heat triggers a thermal oxidation aging reaction on the cable surface, leading to damage such as powdering, brittleness, and cracking. Consequently, external moisture and corrosive media can penetrate the cable through these cracks, damaging its internal structure and ultimately causing insulation breakdown and failure, thus affecting the safety and stability of power transmission. Therefore, improving the heat and oxygen aging resistance of power cables is crucial for ensuring their long-term safe and stable operation. Summary of the Invention

[0003] This invention proposes an aging-resistant power cable and its preparation method, which solves the problem of insufficient heat and oxygen aging resistance of power cables in related technologies.

[0004] The technical solution of the present invention is as follows: This invention proposes an aging-resistant power cable, comprising, from the inside out, a conductor, an insulation layer, and a sheath layer; the sheath layer comprises the following components in parts by weight: 70-90 parts of ethylene propylene diene monomer (EPDM) rubber, 20-30 parts of nitrile rubber, 12-15 parts of ethylene-vinyl acetate copolymer, 3-7 parts of chlorosulfonated polyethylene, 3-5 parts of coupling agent, 2-4 parts of dispersant, 2-14 parts of zirconium-doped cerium oxide, 15-20 parts of flame retardant, 1-3 parts of plasticizer, 6-8 parts of lubricant, 1.5-2.5 parts of vulcanizing agent, and 1-3 parts of vulcanization aid.

[0005] As a further technical solution, the method for preparing zirconium-doped cerium oxide includes the following steps: Add cerium ammonium nitrate and zirconium oxynitrate to water, stir, add alkali solution to adjust the pH to 8.5-10, filter, wash, dry, and calcine to obtain the zirconium-doped cerium oxide.

[0006] As a further technical solution, the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is 7:3 to 9:1.

[0007] As a further technical solution, the mass ratio of the total mass of cerium ammonium nitrate and zirconium oxynitrate to water is 1:15~20.

[0008] As a further technical solution, the stirring speed is 300~500 rpm and the stirring time is 10~15 min.

[0009] As a further technical solution, the alkaline solution is ammonia water with a mass fraction of 10% to 15%.

[0010] As a further technical solution, the washing process involves washing with deionized water 3 to 4 times.

[0011] As a further technical solution, the drying temperature is 100~120℃ and the time is 10~15h.

[0012] As a further technical solution, the calcination temperature is 450~550℃ and the time is 40~80min.

[0013] As a further technical solution, zirconium-doped cerium oxide includes first zirconium-doped cerium oxide and second zirconium-doped cerium oxide.

[0014] As a further technical solution, the difference between the first zirconium-doped cerium oxide and the second zirconium-doped cerium oxide is that the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is different.

[0015] As a further technical solution, the mass ratio of the first zirconium-doped cerium oxide to the second zirconium-doped cerium oxide is 1:1; the molar ratio of cerium ammonium nitrate to zirconium oxynitrate in the first zirconium-doped cerium oxide is 8:2; and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate in the second zirconium-doped cerium oxide is 7:3.

[0016] In the sheath layer of the aging-resistant power cable of this invention, a first zirconium-doped cerium oxide and a second zirconium-doped cerium oxide are used in combination to enhance the cable's resistance to ultraviolet aging without diminishing its resistance to thermo-oxidative aging. When the power cable is in a thermo-oxidative aging environment, the first zirconium-doped cerium oxide has a more stable structure and plays a dominant role, ensuring that its resistance to thermo-oxidative aging is not significantly affected, while the second zirconium-doped cerium oxide assists in improving the cable's resistance to thermo-oxidative aging. When placed in an ultraviolet aging environment, the second zirconium-doped cerium oxide, due to its greater number of oxygen vacancies, generates more effective sites for ultraviolet light absorption, thus primarily enhancing the cable's resistance to ultraviolet aging, while the first zirconium-doped cerium oxide plays a synergistic role in improving its performance.

[0017] As a further technical solution, the coupling agent includes one or both of silane coupling agents and titanate coupling agents.

[0018] As a further technical solution, the dispersant includes one of polyethylene glycol and sodium dodecylbenzenesulfonate.

[0019] In the sheath layer of the aging-resistant power cable of the present invention, the addition of a dispersant can improve the dispersibility of inorganic materials in the polymer matrix; the dispersant can be one or more of the conventional dispersants in the art, such as polyethylene glycol, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, etc., preferably, the dispersant includes polyethylene glycol and sodium dodecylbenzene sulfonate.

[0020] As a further technical solution, the flame retardant includes one or two of zinc borate, magnesium hydroxide, and aluminum hydroxide.

[0021] In the sheath layer of the aging-resistant power cable of the present invention, the addition of a flame retardant improves the flame retardant performance of the sheath layer; the flame retardant can be one or more of the conventional flame retardants in the art, such as one or more of zinc borate, melamine, magnesium hydroxide, and aluminum hydroxide. Preferably, the flame retardant includes one or two of zinc borate, magnesium hydroxide, and aluminum hydroxide.

[0022] As a further technical solution, the plasticizer includes one of dioctyl phthalate and trimethylol phosphate.

[0023] As a further technical solution, the lubricant includes one or two of oleamide, naphthenic oil, and dioctyl terephthalate.

[0024] In the sheath layer of the aging-resistant power cable of the present invention, the lubricant can improve the fluidity of each component and make the components more uniformly mixed; the lubricant can be one or more of the conventional lubricants in the art, such as oleamide, naphthenic oil, dioctyl terephthalate, paraffinic rubber oil, etc. Preferably, the lubricant includes one or two of oleamide, naphthenic oil, and dioctyl terephthalate.

[0025] As a further technical solution, the vulcanizing agent includes sulfur.

[0026] As a further technical solution, the vulcanization aid includes zinc oxide, stearic acid, and an accelerator.

[0027] This invention also proposes a method for preparing an aging-resistant power cable, comprising the following steps: The EPDM rubber and nitrile rubber are first mixed, and then ethylene-vinyl acetate copolymer, chlorosulfonated polyethylene, coupling agent, dispersant, lubricant and plasticizer are added in sequence for the second mixing. Then the remaining components except vulcanizing agent are added and mixed. Finally, the vulcanizing agent is added and mixed for the fourth mixing to obtain the sheath layer material. An insulation layer is wrapped around the conductor to obtain a semi-finished aging-resistant power cable. The sheath material is then extruded and wrapped around the semi-finished aging-resistant power cable, followed by vulcanization to obtain the aging-resistant power cable.

[0028] The working principle and beneficial effects of this invention are as follows: In this invention, the addition of zirconium-doped cerium oxide can improve the thermo-oxidative aging resistance of the power cable sheath. After zirconium doping, it can enter the cerium oxide lattice, enhancing the cerium oxide's ability to capture free radicals. This allows zirconium-doped cerium oxide to more effectively inhibit the oxidation reaction of rubber molecules, reduce molecular chain breakage, and improve the thermo-oxidative aging resistance of the power cable sheath, thereby producing a power cable with excellent thermo-oxidative aging resistance. Even with extended thermo-oxidative aging treatment time, the power cable can still maintain good thermo-oxidative aging resistance. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] In the following embodiments and comparative examples: EPDM rubber: Model 3722P, manufactured by Dow Chemical Company, USA; Nitrile rubber: model number 1052; Ethylene-vinyl acetate copolymer: model number LVS430; Chlorosulfonated polyethylene: Model number CSM5340L, manufacturer is Weifang Keming Chemical Co., Ltd.; Cerium ammonium nitrate: chemical formula is (NH4)2Ce(NO3)6; Zirconium oxynitrate: chemical formula ZrO(NO3)2·6H2O; Silane coupling agent: Model KH550; Titanate coupling agent: Model NDZ-201; Polyethylene glycol: Number average molecular weight is 4000; Naphthenic oil: Model number KN4006.

[0031] Example 1 An aging-resistant power cable comprises, from the inside out, a conductor, an insulation layer, and a sheath layer; the sheath layer comprises the following components in parts by weight: 70 parts EPDM rubber, 20 parts nitrile rubber, 12 parts ethylene-vinyl acetate copolymer, 3 parts chlorosulfonated polyethylene, 3 parts silane coupling agent, 2 parts polyethylene glycol, 2 parts zirconium-doped cerium oxide, 15 parts zinc borate, 1 part tricresyl phosphate, 3 parts oleamide, 3 parts naphthenic oil, 1.5 parts sulfur, 0.4 parts zinc oxide, 0.2 parts stearic acid, 0.1 parts accelerator M, and 0.3 parts accelerator CZ; The method for preparing zirconium-doped cerium oxide includes the following steps: Add cerium ammonium nitrate and zirconium oxynitrate to water (the total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water is 1:15, and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate is 6.5:3.5), stir at 300 rpm for 15 min to obtain a mixture, add 10% ammonia water to adjust the pH of the mixture to 8.5, filter, wash three times with deionized water, dry at 100℃ for 15 h, and finally calcine at 450℃ for 80 min to obtain zirconium-doped cerium oxide; A method for preparing an aging-resistant power cable includes the following steps: EPDM rubber and nitrile rubber were mixed at 110°C for 10 minutes. Then, ethylene-vinyl acetate copolymer, chlorosulfonated polyethylene, silane coupling agent, polyethylene glycol, oleamide, naphthenic oil and tricresyl phosphate were added sequentially and mixed for 5 minutes. Then, zirconium-doped cerium oxide, zinc borate, zinc oxide, stearic acid, accelerator M and accelerator CZ were added and mixed for 3 minutes. Finally, sulfur was added and mixed for 2 minutes to obtain the sheath layer material. A cross-linked polyethylene insulation layer is wrapped around the conductor to obtain a semi-finished aging-resistant power cable. The sheath material is then extruded and wrapped around the semi-finished aging-resistant power cable, and vulcanized at 180°C for 10 minutes to obtain the aging-resistant power cable.

[0032] Example 2 An aging-resistant power cable comprises, from the inside out, a conductor, an insulation layer, and a sheath layer; the sheath layer comprises the following components in parts by weight: 90 parts EPDM rubber, 30 parts nitrile rubber, 15 parts ethylene-vinyl acetate copolymer, 7 parts chlorosulfonated polyethylene, 5 parts titanate coupling agent, 4 parts sodium dodecylbenzenesulfonate, 14 parts zirconium-doped cerium oxide, 12 parts magnesium hydroxide, 8 parts aluminum hydroxide, 3 parts dioctyl phthalate, 8 parts dioctyl terephthalate, 2.5 parts sulfur, 0.8 parts zinc oxide, 0.4 parts stearic acid, 0.45 parts accelerator M, and 1.35 parts accelerator CZ; The method for preparing zirconium-doped cerium oxide includes the following steps: Add cerium ammonium nitrate and zirconium oxynitrate to water (the total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water is 1:20, and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate is 6.5:3.5). Stir at 500 rpm for 10 min to obtain a mixture. Add 15% ammonia water to adjust the pH of the mixture to 10. Filter, wash 4 times with deionized water, dry at 120℃ for 10 h, and finally calcine at 550℃ for 40 min to obtain zirconium-doped cerium oxide. A method for preparing an aging-resistant power cable includes the following steps: EPDM rubber and nitrile rubber were mixed at 110°C for 10 minutes. Then, ethylene-vinyl acetate copolymer, chlorosulfonated polyethylene, titanate coupling agent, sodium dodecylbenzene sulfonate, dioctyl terephthalate and dioctyl phthalate were added in sequence and mixed for 5 minutes. Then, zirconium-doped cerium oxide, magnesium hydroxide, aluminum hydroxide, zinc oxide, stearic acid, accelerator M and accelerator CZ were added and mixed for 3 minutes. Finally, sulfur was added and mixed for 2 minutes to obtain the sheath layer material. A cross-linked polyethylene insulation layer is wrapped around the conductor to obtain a semi-finished aging-resistant power cable. The sheath material is then extruded and wrapped around the semi-finished aging-resistant power cable, and vulcanized at 180°C for 10 minutes to obtain the aging-resistant power cable.

[0033] Example 3 An aging-resistant power cable comprises, from the inside out, a conductor, an insulation layer, and a sheath layer; the sheath layer comprises the following components in parts by weight: 80 parts EPDM rubber, 25 parts nitrile rubber, 13 parts ethylene-vinyl acetate copolymer, 5 parts chlorosulfonated polyethylene, 3 parts silane coupling agent, 1 part titanate coupling agent, 3 parts polyethylene glycol, 12 parts zirconium-doped cerium oxide, 10 parts magnesium hydroxide, 7 parts aluminum hydroxide, 2 parts dioctyl phthalate, 7 parts dioctyl terephthalate, 2 parts sulfur, 0.7 parts zinc oxide, 0.4 parts stearic acid, 0.25 parts accelerator M, and 0.65 parts accelerator CZ; The method for preparing zirconium-doped cerium oxide includes the following steps: Cerium ammonium nitrate and zirconium oxynitrate (the total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water was 1:20, and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate was 6.5:3.5) were added to water and stirred at 450 rpm for 12 min to obtain a mixture. Ammonia water with a mass fraction of 15% was added to make the pH of the mixture 9. The mixture was filtered, washed 4 times with deionized water, dried at 190℃ for 12 h, and finally calcined at 500℃ for 60 min to obtain zirconium-doped cerium oxide. A method for preparing an aging-resistant power cable includes the following steps: EPDM rubber and nitrile rubber were mixed at 110°C for 10 minutes. Then, ethylene-vinyl acetate copolymer, chlorosulfonated polyethylene, silane coupling agent, titanate coupling agent, polyethylene glycol, dioctyl terephthalate and dioctyl phthalate were added sequentially and mixed for 5 minutes. Then, zirconium-doped cerium oxide, magnesium hydroxide, aluminum hydroxide, zinc oxide, stearic acid, accelerator M and accelerator CZ were added and mixed for 3 minutes. Finally, sulfur was added and mixed for 2 minutes to obtain the sheath layer material. A cross-linked polyethylene insulation layer is wrapped around the conductor to obtain a semi-finished aging-resistant power cable. The sheath material is then extruded and wrapped around the semi-finished aging-resistant power cable, and vulcanized at 180°C for 10 minutes to obtain the aging-resistant power cable.

[0034] Example 4 The only difference between this embodiment and Example 3 is that the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is 7:3.

[0035] Example 5 The only difference between this embodiment and Example 3 is that the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is 8:2.

[0036] Example 6 The only difference between this embodiment and Example 3 is that the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is 9:1.

[0037] Example 7 The only difference between this embodiment and Example 3 is that the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is 9.5:0.5.

[0038] Example 8 The only difference between this embodiment and embodiment 5 is that the zirconium-doped cerium oxide is a first zirconium-doped cerium oxide and a second zirconium-doped cerium oxide with a mass ratio of 1:1; The method for preparing zirconium-doped cerium oxide includes the following steps: Cerium ammonium nitrate and zirconium oxynitrate (the total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water was 1:20, and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate was 8:2) were added to water and stirred at 450 rpm for 12 min to obtain a mixture. Ammonia water with a mass fraction of 15% was added to make the pH of the mixture 9. The mixture was filtered, washed 4 times with deionized water, dried at 190℃ for 12 h, and finally calcined at 500℃ for 60 min to obtain the first zirconium-doped cerium oxide. The method for preparing the second zirconium-doped cerium oxide includes the following steps: Cerium ammonium nitrate and zirconium oxynitrate (total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water was 1:20, and molar ratio of cerium ammonium nitrate to zirconium oxynitrate was 6.5:3.5) were added to water and stirred at 450 rpm for 12 min to obtain a mixture. Ammonia water with a mass fraction of 15% was added to make the pH of the mixture 9. The mixture was filtered, washed 4 times with deionized water, dried at 190℃ for 12 h, and finally calcined at 500℃ for 60 min to obtain the second zirconium-doped cerium oxide.

[0039] Example 9 The only difference between this embodiment and embodiment 5 is that the zirconium-doped cerium oxide is a first zirconium-doped cerium oxide and a second zirconium-doped cerium oxide with a mass ratio of 1:1; The preparation method of the first zirconium-doped cerium oxide is the same as in Example 8; The method for preparing the second zirconium-doped cerium oxide includes the following steps: Cerium ammonium nitrate and zirconium oxynitrate (the total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water was 1:20, and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate was 7:3) were added to water and stirred at 450 rpm for 12 min to obtain a mixture. Ammonia water with a mass fraction of 15% was added to make the pH of the mixture 9. The mixture was filtered, washed 4 times with deionized water, dried at 190 °C for 12 h, and finally calcined at 500 °C for 60 min to obtain the second zirconium-doped cerium oxide.

[0040] Example 10 The only difference between this embodiment and embodiment 5 is that the zirconium-doped cerium oxide is a first zirconium-doped cerium oxide and a second zirconium-doped cerium oxide with a mass ratio of 1:1; The preparation method of the first zirconium-doped cerium oxide is the same as in Example 8; The method for preparing the second zirconium-doped cerium oxide includes the following steps: Cerium ammonium nitrate and zirconium oxynitrate (the total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water was 1:20, and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate was 9:1) were added to water and stirred at 450 rpm for 12 min to obtain a mixture. Ammonia water with a mass fraction of 15% was added to make the pH of the mixture 9. The mixture was filtered, washed 4 times with deionized water, dried at 190 °C for 12 h, and finally calcined at 500 °C for 60 min to obtain the second zirconium-doped cerium oxide.

[0041] Example 11 The only difference between this embodiment and embodiment 5 is that the zirconium-doped cerium oxide is a first zirconium-doped cerium oxide and a second zirconium-doped cerium oxide with a mass ratio of 1:1; The preparation method of the first zirconium-doped cerium oxide is the same as in Example 8; The method for preparing the second zirconium-doped cerium oxide includes the following steps: Cerium ammonium nitrate and zirconium oxynitrate (total mass ratio of cerium ammonium nitrate and zirconium oxynitrate to water was 1:20, and molar ratio of cerium ammonium nitrate to zirconium oxynitrate was 9.5:0.5) were added to water and stirred at 450 rpm for 12 min to obtain a mixture. Ammonia water with a mass fraction of 15% was added to make the pH of the mixture 9. The mixture was filtered, washed 4 times with deionized water, dried at 190℃ for 12 h, and finally calcined at 500℃ for 60 min to obtain the second zirconium-doped cerium oxide.

[0042] Comparative Example 1 The only difference between this comparative example and Example 3 is that zirconium-doped cerium oxide is replaced with cerium dioxide.

[0043] Comparative Example 2 The only difference between this comparative example and Example 3 is that zirconium-doped cerium oxide is replaced with antioxidant RD.

[0044] The aging-resistant power cable sheaths obtained in Examples 1-11 and Comparative Examples 1-2 were tested according to the following method: 1. Tensile strength: Tested according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", using dumbbell-shaped type 1A specimens. 2. Hot air aging performance: According to GB / T 3512-2014 "Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber in hot air", the aging temperature is 120℃ and the time is 168h and 336h. 3. Ultraviolet aging performance: The test was conducted according to GB / T 16585-1996 "Artificial weathering (fluorescent ultraviolet lamp) test method for vulcanized rubber". The exposure time was 24 hours and the ultraviolet light wavelength was 300 nm. Tensile strength change rate = (Tensile strength after aging treatment - Tensile strength before aging) / Tensile strength before aging × 100%; The test results are shown in Tables 1 and 2: Table 1 Performance test results of the aging-resistant power cable sheaths prepared in Examples 1-11 and Comparative Example 1

[0045] Table 2. Results of hot air aging treatment of the aging-resistant power cable sheaths prepared in Example 3 and Comparative Example 2 at different times.

[0046] 1. Compared with Comparative Example 1, the tensile strength of the aging-resistant power cable sheath layer prepared in Examples 1-11 after hot air aging treatment is much lower than that in Comparative Example 1. This indicates that the addition of zirconium-doped cerium oxide can improve the thermo-oxidative aging resistance of the aging-resistant power cable sheath layer, thereby improving the thermo-oxidative aging resistance of the aging-resistant power cable.

[0047] 2. Compared with Examples 3 to 7, the tensile strength of the aging-resistant power cable sheath layer prepared in Examples 4 to 6 decreased less after hot air aging treatment than that in Examples 3 and 7. This indicates that when the molar ratio of cerium ammonium nitrate to zirconium oxynitrate is 7:3 to 9:1 during the preparation of zirconium-doped cerium oxide, the material added to the sheath layer has the best thermo-oxidative aging resistance, and the aging-resistant power cable further obtained also exhibits excellent thermo-oxidative aging resistance.

[0048] 3. Compared with Examples 5 and 8-11, the tensile strength of the aging-resistant power cable sheath layer prepared in Example 9 decreased less after UV aging treatment than that of Examples 5, 8 and 10-11. This indicates that the zirconium-doped cerium oxide prepared with a molar ratio of 7:3 for cerium ammonium nitrate and 8:2 for zirconium oxynitrate improved the UV aging resistance of the aging-resistant power cable sheath layer.

[0049] 4. Comparing Example 3 and Comparative Example 2, after 168 hours of hot air aging treatment, the decrease in tensile strength of the aging-resistant power cable sheath layer obtained by Example 3 and Comparative Example 2 was not significantly different. However, after 336 hours of hot air aging treatment, the decrease in tensile strength of the aging-resistant power cable sheath layer obtained by Example 3 was significantly lower than that of Comparative Example 2. This indicates that the addition of zirconium-doped cerium oxide can maintain the durability of the thermo-oxidative aging resistance of the aging-resistant power cable sheath layer.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An aging-resistant power cable, characterized in that, From the inside out, it includes a conductor, an insulating layer, and a sheath layer; the sheath layer comprises the following components in parts by weight: 70-90 parts of ethylene propylene diene monomer (EPDM) rubber, 20-30 parts of nitrile rubber, 12-15 parts of ethylene-vinyl acetate copolymer, 3-7 parts of chlorosulfonated polyethylene, 3-5 parts of coupling agent, 2-4 parts of dispersant, 2-14 parts of zirconium-doped cerium oxide, 15-20 parts of flame retardant, 1-3 parts of plasticizer, 6-8 parts of lubricant, 1.5-2.5 parts of vulcanizing agent, and 1-3 parts of vulcanization aid.

2. The aging-resistant power cable according to claim 1, characterized in that, The method for preparing zirconium-doped cerium oxide includes the following steps: Add cerium ammonium nitrate and zirconium oxynitrate to water, stir, add alkali solution to adjust the pH to 8.5-10, filter, wash, dry, and calcine to obtain the zirconium-doped cerium oxide.

3. The aging-resistant power cable according to claim 2, characterized in that, The molar ratio of cerium ammonium nitrate to zirconium oxynitrate is 7:3 to 9:

1.

4. The aging-resistant power cable according to claim 2, characterized in that, The mass ratio of the total mass of cerium ammonium nitrate and zirconium oxynitrate to water is 1:15~20; The alkaline solution is ammonia water with a mass fraction of 10% to 15%; The roasting temperature is 450~550℃ and the time is 40~80min.

5. The aging-resistant power cable according to claim 3, characterized in that, The zirconium-doped cerium oxide includes a first zirconium-doped cerium oxide and a second zirconium-doped cerium oxide; The difference between the first zirconium-doped cerium oxide and the second zirconium-doped cerium oxide is that the molar ratio of cerium ammonium nitrate and zirconium oxynitrate is different.

6. The aging-resistant power cable according to claim 5, characterized in that, The mass ratio of the first zirconium-doped cerium oxide to the second zirconium-doped cerium oxide is 1:1; the molar ratio of cerium ammonium nitrate to zirconium oxynitrate in the first zirconium-doped cerium oxide is 8:2; and the molar ratio of cerium ammonium nitrate to zirconium oxynitrate in the second zirconium-doped cerium oxide is 7:

3.

7. The aging-resistant power cable according to claim 1, characterized in that, The coupling agent includes one or both of silane coupling agents and titanate coupling agents; The dispersant includes one of polyethylene glycol and sodium dodecylbenzenesulfonate.

8. The aging-resistant power cable according to claim 1, characterized in that, The flame retardant includes one or two of zinc borate, magnesium hydroxide, and aluminum hydroxide. The plasticizer includes one of dioctyl phthalate and trimethylol phosphate.

9. The aging-resistant power cable according to claim 1, characterized in that, The lubricant includes one or two of oleamide, naphthenic oil, and dioctyl terephthalate; The vulcanizing agent includes sulfur; The vulcanization aids include zinc oxide, stearic acid, and accelerators.

10. A method for preparing an aging-resistant power cable, used to prepare the aging-resistant power cable according to any one of claims 1 to 9, characterized in that, Includes the following steps: The EPDM rubber and nitrile rubber are first mixed, then ethylene-vinyl acetate copolymer, chlorosulfonated polyethylene, coupling agent, dispersant, lubricant and plasticizer are added in sequence for the second mixing, then the remaining components except the vulcanizing agent are added for the third mixing, and finally the vulcanizing agent is added for the fourth mixing to obtain the sheath layer material. An insulation layer is wrapped around the conductor to obtain a semi-finished aging-resistant power cable. The sheath material is then extruded and wrapped around the semi-finished aging-resistant power cable, followed by vulcanization to obtain the aging-resistant power cable.

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