Anti-aging aerial cable and preparation method thereof

Abstract

The invention relates to the technical field of cable materials, and provides an anti-aging aerial cable and a preparation method thereof. The anti-aging aerial cable comprises a conductor, an insulating layer and an outer sheath layer from inside to outside in sequence, the outer sheath layer is prepared from the following raw materials in parts by weight: 60-70 parts of ethylene propylene diene monomer, 30-40 parts of nitrile rubber, 18-20 parts of ethylene-vinyl acetate copolymer, 4-6 parts of modified bentonite, 13-14 parts of silane modified core-shell structure titanium dioxide, 0.8-1 part of hindered phenol antioxidant, 0.5-1 part of dicumyl peroxide, 2-3 parts of zinc oxide and 0.5-1 part of stearic acid. According to the anti-aging aerial cable prepared in the invention, the anti-aging aerial cable is improved, and the capability of solving the problems that an antioxidant is easy to migrate and the anti-aging effect is poor due to migration acceleration at a high temperature in a traditional antioxidant adding method is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable materials, and in particular to an aging-resistant overhead cable and a preparation method thereof. Background Art

[0002] Overhead cables play a crucial role in power transmission and distribution systems, and are widely used in urban and rural power grids, as well as in industrial applications. However, overhead cables are exposed to a variety of natural factors, including ultraviolet rays, oxygen, humidity, and temperature fluctuations, and are prone to aging. This deteriorates the cables' mechanical and electrical properties, shortening their service life.

[0003] Currently, the main methods for improving the aging resistance of overhead cables include material modification and the addition of antioxidants. However, antioxidants may migrate within the cable material over time, resulting in uneven distribution and thus compromising the anti-aging effect. Especially in high-temperature environments, the migration of antioxidants is accelerated, further reducing the cable's aging resistance. Furthermore, antioxidants may gradually lose their effectiveness over long-term use, losing their sustained anti-aging effect. Furthermore, some antioxidants may chemically react with other components in the cable material, causing performance degradation or producing harmful substances, impacting the cable's safety and reliability.

[0004] In order to solve the above technical problems, the present invention proposes a new aging-resistant overhead cable and a preparation method thereof. Summary of the Invention

[0005] The present invention provides an aging-resistant overhead cable and a preparation method thereof, which improves the ability to solve the problem in the traditional method of adding antioxidants that the antioxidants are easy to migrate and the migration is accelerated at high temperatures, resulting in poor anti-aging effect; and improves the ability to solve the problem that the antioxidants are easy to lose their effectiveness after long-term use and cannot continuously exert their anti-aging effects.

[0006] The technical solutions of the present invention are as follows: In the first aspect, the present invention proposes an aging-resistant overhead cable, which includes a conductor, an insulation layer, and an outer sheath layer from the inside to the outside, wherein the outer sheath layer is composed of the following raw materials in parts by weight: 60-70 parts of EPDM rubber, 30-40 parts of nitrile rubber, 18-20 parts of ethylene-vinyl acetate copolymer, 4-6 parts of modified bentonite, 13-14 parts of silane-modified core-shell structured titanium dioxide, 0.8-1 part of hindered phenol antioxidant, 0.5-1 part of diisopropyl benzene peroxide, 2-3 parts of zinc oxide, and 0.5-1 part of stearic acid.

[0007] As a further technical solution, the preparation method of the modified bentonite includes: dispersing sodium bentonite with an average particle size of 3-5 μm in a mixture of ethanol and water, placing it in a solution plasma device after ultrasonic treatment, introducing argon gas with a flow rate controlled at 10-20 L / min, maintaining the reaction temperature at 40±5°C, treating it at a power of 700-900 W for 30-40 minutes, centrifuging, and drying to constant weight to obtain the modified bentonite.

[0008] As a further technical solution, the usage ratio of the sodium bentonite, ethanol and water is 100g:200-280mL:50-70mL.

[0009] As a further technical solution, the ultrasonic power is 250-350W, and the ultrasonic time is 20-30min.

[0010] As a further technical solution, the preparation method of the silane-modified core-shell structure titanium dioxide includes: adding tetraethylenepentamine to isopropanol and stirring evenly, then adding tetraisopropyl titanate to the above solution, stirring for 30-40 minutes, reacting at 180-220°C for 20-24 hours, then washing the resulting product with ethanol, centrifuging, drying, and calcining to obtain core-shell structure titanium dioxide; ultrasonically dispersing the core-shell structure titanium dioxide in anhydrous ethanol, then adding a silane coupling agent KH570, protecting under nitrogen, refluxing at 75-85°C for 5-6 hours, centrifuging, washing, and drying to obtain the product.

[0011] As a further technical solution, the volume ratio of tetraethylenepentamine, isopropyl alcohol and tetraisopropyl titanate is 0.1-0.14:80-90:2.5-3.5.

[0012] As a further technical solution, the calcination temperature is 380-420° C. and the calcination time is 100-140 minutes.

[0013] As a further technical solution, the usage ratio of the core-shell structured titanium dioxide, anhydrous ethanol and silane coupling agent KH570 is 10g:80-120mL:1-1.2g.

[0014] In a second aspect, the present invention provides a method for preparing an aging-resistant overhead cable, comprising the steps of: S1. Add EPDM rubber, nitrile rubber, and ethylene-vinyl acetate copolymer into an internal mixer and mix at a temperature of 165-175° C. for 4-6 minutes; add modified bentonite, silane-modified core-shell titanium dioxide, hindered phenol antioxidant, dicumyl peroxide, zinc oxide, and stearic acid, and continue mixing for 2-3 minutes before discharging; S2. Assemble the insulating layer outside the conductor, and then extrude the outer sheath layer through a twin-screw extruder and coat it on the outer surface of the insulating layer to obtain an aging-resistant overhead cable.

[0015] As a further technical solution, the extruder temperature is: 160-170°C in zone 1, 170-180°C in zone 2, 175-185°C in zone 3, and 180-190°C at the die head.

[0016] The working principle and beneficial effects of the present invention are: After the modified bentonite in the present invention is treated with plasma, its surface properties change, and it can be evenly dispersed in the rubber matrix and form a physical barrier. This physical barrier is like a series of "walls" that "trap" the antioxidant inside the matrix, limiting the migration path of the antioxidant. Even at high temperatures, it becomes more difficult for the antioxidant molecules to pass through the dense network structure formed by the modified bentonite, thereby effectively reducing the amount of antioxidant migration. After the silane-modified core-shell structure titanium dioxide is modified with the silane coupling agent KH570, the surface polarity of the silane-modified core-shell structure titanium dioxide is reduced, and its compatibility with the rubber matrix is ​​enhanced, allowing it to be evenly dispersed in the matrix. It forms a strong interfacial interaction with the rubber molecules, which can be regarded as a kind of "anchoring" effect, "fixing" the antioxidant molecules in the matrix. When the antioxidant attempts to migrate, it will be affected by the interfacial interaction between the silane-modified core-shell structure titanium dioxide and the rubber matrix, increasing the resistance to migration.

[0017] At the same time, the presence of the core-shell titanium dioxide alters the microstructure within the matrix, making it more difficult for antioxidant molecules to diffuse within the matrix and further inhibiting their migration. The physical barrier provided by the modified bentonite and the interfacial interaction of the silane-modified core-shell titanium dioxide synergize. The modified bentonite restricts the antioxidant's migration path at a macroscopic level, while the silane-modified core-shell titanium dioxide increases resistance to antioxidant migration at a microscopic level. These two combined effects significantly enhance the antioxidant's stability within the matrix, effectively addressing the issues with traditional antioxidants, such as their ease of migration and the accelerated migration at high temperatures that can lead to poor anti-aging effectiveness.

[0018] The physical barrier formed by the modified bentonite in this invention not only prevents the penetration of external aging factors but also protects the rubber molecules within to a certain extent. It delays the contact of aging factors such as oxygen and moisture with the rubber molecules, reduces the generation of free radicals, and thus minimizes damage to the rubber molecules. This sustained protective effect ensures that the cable maintains good performance over long-term use, extending the cable's service life.

[0019] Furthermore, the modified bentonite is highly stable and, unlike traditional antioxidants, is not susceptible to chemical reactions and ineffectiveness, maintaining its long-term physical barrier properties. The core titanium dioxide in the silane-modified core-shell titanium dioxide exhibits UV scattering and free radical scavenging capabilities. Over extended use, it continuously blocks UV damage to the polymer and captures free radicals, slowing down the polymer's photooxidative degradation. Modification with the silane coupling agent KH570 enhances the compatibility and stability of the core-shell titanium dioxide with the rubber matrix, enabling it to disperse evenly within the matrix and maintain its long-term activity. Even after extended use, the core-shell titanium dioxide maintains its UV protection and free radical scavenging capabilities, providing sustained anti-aging protection for the cable.

[0020] Therefore, the synergistic effect of modified bentonite and silane-modified core-shell titanium dioxide provides comprehensive, multi-layered anti-aging protection for cables over long-term use. The modified bentonite prevents the penetration of aging factors at a macroscopic level, providing a relatively stable environment for the internal materials; while the silane-modified core-shell titanium dioxide directly combats aging factors at a microscopic level, inhibiting the aging reactions of the polymer. Together, these two antioxidants address the long-term ineffectiveness and inability of traditional antioxidants to maintain their anti-aging effects, significantly improving the cable's aging resistance and service life. DETAILED DESCRIPTION

[0021] 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.

[0022] It should be noted that the EPDM rubber in the present invention was purchased from Dow Chemical (China) Co., Ltd. with the brand EPDM725P; the nitrile rubber was purchased from PetroChina Lanzhou Petrochemical Company with the brand N21L; and the ethylene-vinyl acetate copolymer was purchased from DuPont, USA with the model EVA 40W.

[0023] Example 1 This embodiment provides an aging-resistant overhead cable, comprising a conductor, an insulation layer, and an outer sheath layer. The outer sheath layer is composed of the following raw materials in parts by weight: 65 parts of EPDM rubber, 35 parts of nitrile rubber, 19 parts of ethylene-vinyl acetate copolymer, 5 parts of modified bentonite, 13.5 parts of silane-modified core-shell titanium dioxide, 0.9 parts of hindered phenol antioxidant 1010, 0.8 parts of dicumyl peroxide, 2.5 parts of zinc oxide, and 0.8 parts of stearic acid. The preparation method of the modified bentonite includes: dispersing 100 g of sodium bentonite with an average particle size of 4 μm in a mixture of ethanol and water with a volume ratio of 240 mL:60 mL, ultrasonically treating the mixture at a power of 300 W for 25 minutes, placing the mixture in a solution plasma device, introducing argon gas at a flow rate of 15 L / min, treating the mixture at a power of 800 W for 35 minutes, maintaining the reaction temperature at 40° C., centrifuging the mixture at 8500 rpm for 12 minutes, and vacuum drying the mixture at 65° C. to constant weight. The preparation method of silane-modified core-shell titanium dioxide includes: adding 0.12 mL of tetraethylene pentamine to 85 mL of isopropanol and stirring evenly, then adding 3 mL of tetraisopropyl titanate to the above solution, stirring for 35 minutes, reacting at 200°C for 22 hours, then washing the resulting product with ethanol, centrifuging, drying, and calcining at 400°C for 120 minutes to obtain core-shell titanium dioxide; taking 10 g of ultrasonically dispersed in 100 mL of anhydrous ethanol, then adding 1.1 g of silane coupling agent KH570, protecting with nitrogen, reflux at 80°C for 5.5 hours, centrifuging, washing, and drying at 80°C for 11 hours to obtain the titanium dioxide; A method for preparing an aging-resistant overhead cable comprises the following steps: S1. Add EPDM rubber, nitrile rubber, and ethylene-vinyl acetate copolymer into an internal mixer and mix at 170° C. for 5 minutes; add modified bentonite, silane-modified core-shell titanium dioxide, hindered phenol antioxidant, dicumyl peroxide, zinc oxide, and stearic acid, and continue mixing for 2.5 minutes before discharging; S2. Assemble the conductor and the insulation layer, and then extrude the outer sheath layer through a twin-screw extruder and coat it on the outer surface of the insulation layer. The extruder temperature is: 165°C in zone 1, 175°C in zone 2, 180°C in zone 3, and 185°C in the die head, and finally obtain an aging-resistant overhead cable.

[0024] Example 2 This embodiment provides an aging-resistant overhead cable, comprising a conductor, an insulation layer, and an outer sheath layer. The outer sheath layer is composed of the following raw materials in parts by weight: 60 parts of EPDM rubber, 30 parts of nitrile rubber, 18 parts of ethylene-vinyl acetate copolymer, 4 parts of modified bentonite, 13 parts of silane-modified core-shell titanium dioxide, 0.8 parts of hindered phenol antioxidant 1010, 0.5 parts of dicumyl peroxide, 2 parts of zinc oxide, and 0.5 parts of stearic acid. The preparation method of the modified bentonite includes: dispersing 100 g of sodium bentonite with an average particle size of 3 μm in a mixture of ethanol and water with a volume ratio of 200 mL:50 mL, ultrasonically treating the mixture at a power of 250 W for 20 minutes, placing the mixture in a solution plasma device, introducing argon gas at a flow rate of 10 L / min, treating the mixture at a power of 700 W for 30 minutes, maintaining the reaction temperature at 40° C., centrifuging at 8000 rpm for 10 minutes, and vacuum drying the mixture at 60° C. to constant weight. The preparation method of silane-modified core-shell titanium dioxide includes: adding 0.1 mL of tetraethylene pentamine to 80 mL of isopropanol, stirring evenly, adding 2.5 mL of tetraisopropyl titanate to the above solution, stirring for 30 minutes, reacting at 180°C for 20 hours, and then washing the resulting product with ethanol, centrifuging, drying, and calcining at 380°C for 100 minutes to obtain core-shell titanium dioxide; taking 10 g of ultrasonically dispersed in 80 mL of anhydrous ethanol, then adding 1 g of silane coupling agent KH570, protecting with nitrogen, refluxing at 75°C for 5 hours, centrifuging, washing, and drying at 80°C for 10 hours to obtain the core-shell titanium dioxide; A method for preparing an aging-resistant overhead cable comprises the following steps: S1. Add EPDM rubber, nitrile rubber, and ethylene-vinyl acetate copolymer into an internal mixer and mix at 165° C. for 4 minutes; add modified bentonite, silane-modified core-shell titanium dioxide, hindered phenol antioxidant, dicumyl peroxide, zinc oxide, and stearic acid, and continue mixing for 2 minutes before discharging; S2. Assemble the conductor and the insulation layer, and then extrude the outer sheath layer through a twin-screw extruder and coat it on the outer surface of the insulation layer. The extruder temperature is: 160°C in zone 1, 170°C in zone 2, 175°C in zone 3, and 180°C in the die head, and finally obtain an aging-resistant overhead cable.

[0025] Example 3 This embodiment provides an aging-resistant overhead cable, comprising a conductor, an insulation layer, and an outer sheath layer. The outer sheath layer is composed of the following raw materials in parts by weight: 70 parts of EPDM rubber, 40 parts of nitrile rubber, 20 parts of ethylene-vinyl acetate copolymer, 6 parts of modified bentonite, 14 parts of silane-modified core-shell titanium dioxide, 1 part of hindered phenol antioxidant 1010, 1 part of dicumyl peroxide, 3 parts of zinc oxide, and 1 part of stearic acid. The preparation method of the modified bentonite comprises: dispersing 100 g of sodium bentonite with an average particle size of 5 μm in a mixture of ethanol and water with a volume ratio of 280 mL:70 mL, ultrasonically treating the mixture at a power of 350 W for 30 minutes, placing the mixture in a solution plasma device, introducing argon gas at a flow rate of 20 L / min, treating the mixture at a power of 900 W for 40 minutes, maintaining the reaction temperature at 40° C., centrifuging at 9000 rpm for 15 minutes, and vacuum drying the mixture at 70° C. to constant weight. The preparation method of silane-modified core-shell titanium dioxide includes: adding 0.14 mL of tetraethylene pentamine to 90 mL of isopropanol and stirring evenly, then adding 3.5 mL of tetraisopropyl titanate to the above solution, stirring for 40 minutes, reacting at 220°C for 24 hours, and then washing the resulting product with ethanol, centrifuging, drying, and calcining at 420°C for 140 minutes to obtain core-shell titanium dioxide; taking 10 g of ultrasonically dispersed in 120 mL of anhydrous ethanol, then adding 1.2 g of silane coupling agent KH570, protecting with nitrogen, reflux at 85°C for 6 hours, centrifuging, washing, and drying at 80°C for 12 hours to obtain the titanium dioxide; A method for preparing an aging-resistant overhead cable comprises the following steps: S1. Add EPDM rubber, nitrile rubber, and ethylene-vinyl acetate copolymer into an internal mixer and mix at 175° C. for 6 minutes; add modified bentonite, silane-modified core-shell titanium dioxide, hindered phenol antioxidant, dicumyl peroxide, zinc oxide, and stearic acid, and continue mixing for 3 minutes before discharging; S2. Assemble the conductor and the insulation layer, and then extrude the outer sheath layer through a twin-screw extruder and coat it on the outer surface of the insulation layer. The extruder temperature is: 170°C in zone 1, 180°C in zone 2, 185°C in zone 3, and 190°C in the die head, and finally an aging-resistant overhead cable is obtained.

[0026] Comparative Example 1 In Comparative Example 1, the modified bentonite was replaced by unmodified bentonite of equal mass. The rest was the same as in Example 1, and the preparation steps were the same as in Example 1.

[0027] Comparative Example 2 In Comparative Example 2, modified bentonite was not 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.

[0028] Comparative Example 3 In Comparative Example 3, the silane-modified core-shell titanium dioxide was replaced with an equal mass of core-shell titanium dioxide, and the rest was the same as in Example 1, and the preparation steps were the same as in Example 1.

[0029] Comparative Example 4 In Comparative Example 4, the silane-modified core-shell titanium dioxide was replaced with titanium dioxide of equal mass, and the rest was the same as in Example 1, and the preparation steps were the same as in Example 1.

[0030] Comparative Example 5 In Comparative Example 5, no silane-modified core-shell titanium dioxide was added to the raw materials. The rest was the same as in Example 1, and the preparation steps were the same as in Example 1.

[0031] Comparative Example 6 In Comparative Example 6, the modified bentonite was replaced by an equal mass of bentonite, the silane-modified core-shell structure titanium dioxide was replaced by an equal mass of core-shell structure titanium dioxide, and the rest was the same as in Example 1, and the preparation steps were the same as in Example 1.

[0032] Test Example: The outer sheath layer of the aging-resistant overhead cables prepared in Examples 1-3 and Comparative Examples 1-6 was subjected to the following tests: Tensile strength and elongation at break: tested in accordance with GB / T2951.11-2008; UV aging: Place the sample in a xenon lamp aging chamber (wavelength 340nm, irradiation intensity 0.35W / m², black mark temperature 60℃, relative humidity 50%) and circulate the irradiation for 10 days; Thermal oxidative aging: Place the sample in a hot air aging box at 100°C for 168 hours; Hygrothermal aging: place the sample in an environment of 85℃ / 85%RH for 168h; Calculate the tensile strength retention rate according to the following formula; Tensile strength retention rate (%) = tensile strength after aging / tensile strength before heat aging × 100%; The test results are shown in Table 1 below: Table 1

[0033] The above data show that Examples 1-3 significantly outperform all comparative examples in terms of tensile strength, elongation at break, and retention under three aging conditions, demonstrating that the combination of modified bentonite and silane-modified core-shell titanium dioxide is key to improving aging resistance. Comparative Examples 1-6 exhibit inferior performance compared to the examples, with Comparative Example 6 (lacking both modifying materials) exhibiting the worst performance, demonstrating the essential importance of both modifying materials.

[0034] In Comparative Example 1, the unmodified bentonite has poor dispersibility and low compatibility with the matrix, which weakens the reinforcement effect, the tensile strength decreases by 15.1 MPa, and the aging retention rate decreases; in Comparative Example 2, the reinforcing and barrier effects of bentonite are missing, the material density decreases, the tensile strength decreases by 14.3 MPa, and the wet-heat aging retention rate is only 76.5%; in Comparative Example 3, the unmodified core-shell TiO2 has high surface polarity and is easy to agglomerate, which weakens the ultraviolet scattering and free radical capture capabilities, and the ultraviolet aging retention rate decreases by 86.2%; in Comparative Example 4, ordinary TiO2 has no core-shell structure and strong photocatalytic activity, which accelerates the photooxidative degradation of the polymer, and the ultraviolet aging retention rate plummets to 70.2%; in Comparative Example 5, the ultraviolet shielding function is missing, the polymer is directly degraded by UV radiation, the ultraviolet aging retention rate is the lowest, and the tensile strength decreases; in Comparative Example 6, there is neither the physical barrier effect of bentonite nor the ultraviolet protection of core-shell TiO2, the aging rate doubles, and the overall performance is the worst.

[0035] The above are only 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 in the scope of protection of the present invention.

Claims

1. An aging-resistant overhead cable, characterized in that: From the inside to the outside, it includes a conductor, an insulating layer, and an outer sheath layer. The outer sheath layer is composed of the following raw materials in parts by weight: 60-70 parts of EPDM rubber, 30-40 parts of nitrile rubber, 18-20 parts of ethylene-vinyl acetate copolymer, 4-6 parts of modified bentonite, 13-14 parts of silane-modified core-shell structure titanium dioxide, 0.8-1 part of hindered phenol antioxidant, 0.5-1 part of diisopropyl benzene peroxide, 2-3 parts of zinc oxide, and 0.5-1 part of stearic acid.

2. The aging-resistant overhead cable according to claim 1, characterized in that: The preparation method of the modified bentonite comprises: dispersing sodium bentonite with an average particle size of 3-5 μm in a mixture of ethanol and water, placing the mixture into a solution plasma device after ultrasonic treatment, introducing argon gas with a flow rate controlled at 10-20 L / min, maintaining the reaction temperature at 40±5°C, treating the mixture at a power of 700-900 W for 30-40 minutes, centrifuging, and drying the mixture to a constant weight.

3. The aging-resistant overhead cable according to claim 2, characterized in that: The usage ratio of the sodium bentonite, ethanol and water is 100g:200-280mL:50-70mL.

4. The aging-resistant overhead cable according to claim 2, characterized in that: The ultrasonic power is 250-350W, and the ultrasonic time is 20-30min.

5. The aging-resistant overhead cable according to claim 1, characterized in that: The preparation method of the silane-modified core-shell structure titanium dioxide comprises: adding tetraethylenepentamine to isopropyl alcohol and stirring evenly, then adding tetraisopropyl titanate to the solution, stirring for 30-40 minutes, reacting at 180-220° C. for 20-24 hours, then washing the resulting product with ethanol, centrifuging, drying, and calcining to obtain the core-shell structure titanium dioxide; ultrasonically dispersing the core-shell structure titanium dioxide in anhydrous ethanol, then adding a silane coupling agent KH570, refluxing at 75-85° C. for 5-6 hours under nitrogen protection, centrifuging, washing, and drying to obtain the titanium dioxide.

6. The aging-resistant overhead cable according to claim 5, characterized in that: The volume ratio of tetraethylenepentamine, isopropyl alcohol and tetraisopropyl titanate is 0.1-0.14:80-90:2.5-3.

5.

7. The aging-resistant overhead cable according to claim 5, characterized in that: The calcination temperature is 380-420° C., and the calcination time is 100-140 minutes.

8. The aging-resistant overhead cable according to claim 5, characterized in that: The usage ratio of the core-shell structured titanium dioxide, anhydrous ethanol and silane coupling agent KH570 is 10g:80-120mL:1-1.2g.

9. The method for preparing an aging-resistant overhead cable according to any one of claims 1 to 8, characterized in that the steps include: S1. Add EPDM rubber, nitrile rubber, and ethylene-vinyl acetate copolymer into an internal mixer and mix at a temperature of 165-175° C. for 4-6 minutes; add modified bentonite, silane-modified core-shell titanium dioxide, hindered phenol antioxidant, dicumyl peroxide, zinc oxide, and stearic acid, and continue mixing for 2-3 minutes before discharging; S2. Assemble the insulating layer outside the conductor, and then extrude the outer sheath layer through a twin-screw extruder and coat it on the outer surface of the insulating layer to obtain an aging-resistant overhead cable.

10. The method for preparing an aging-resistant overhead cable according to claim 9, characterized in that: The extruder temperature is: 160-170°C in zone 1, 170-180°C in zone 2, 175-185°C in zone 3, and 180-190°C at the die head.

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