High-strength power cable

Abstract

The invention relates to the technical field of power cables, and provides a high-strength power cable which sequentially comprises a wire core, an inner protective layer, an armor layer and an outer sheath layer from inside to outside, and the wire core sequentially comprises a conductor and an insulating layer from inside to outside; the outer sheath layer is prepared from the following raw materials in parts by weight: 90-110 parts of butyl rubber, 1-2 parts of a vulcanizing agent, 1-3 parts of an anti-aging agent, 3-5 parts of a lubricating agent, 6-10 parts of a flame retardant and 15-20 parts of a filling agent; the flame retardant comprises melamine, sodium silicate and zirconium phosphate. According to the technical scheme, the problem of poor flame retardance of the high-strength power cable in the prior art is solved.

Description

Technical Field

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

[0002] As modern power systems evolve toward higher voltages and higher density, the flame-retardant performance of high-strength power cables has become a key bottleneck restricting grid reliability. The corrosive gases and toxic substances released by traditional halogen-containing flame-retardant cables during fires have become a major safety hazard. The acidic gases produced during combustion can accelerate the aging of equipment insulation. Statistics show that approximately 40% of electrical fires involve cable flame-retardant failure. Existing halogen-free flame-retardant materials exhibit significant performance degradation in high-temperature environments. When the temperature of high-strength power cables exceeds a critical value, the material's oxygen index plummets, resulting in a loss of flame retardancy and failing to meet safety requirements under extreme operating conditions.

[0003] Current flame-retardant technology for high-strength power cables faces multiple challenges. Halogenated flame retardants release highly toxic dioxins upon combustion, which are over a thousand times more toxic than potassium cyanide and have been completely banned by the European Union. Halogen-free flame retardants, such as aluminum hydroxide, require high addition ratios to meet flame retardancy standards, but this can severely degrade the material's mechanical properties. Traditional flame retardants struggle to effectively suppress heat buildup, accelerating temperature increases within power cable layers and causing thermal degradation, exponentially decreasing flame retardancy. These challenges are particularly acute in specialized applications such as rail transit and new energy vehicle charging facilities, necessitating the development of new, highly flame-retardant cable materials.

[0004] In summary, it is of vital importance to develop a high-strength power cable with improved flame retardancy to provide reliable safety protection for high-voltage power transmission, rail transit and other fields. Summary of the Invention

[0005] The present invention provides a high-strength power cable, which solves the problem of poor flame retardancy of high-strength power cables in the related art.

[0006] The technical solutions of the present invention are as follows: The present invention provides a high-strength power cable, which comprises, from the inside to the outside, a core, an inner sheath, an armor layer, and an outer sheath layer. The core comprises, from the inside to the outside, a conductor and an insulation layer. The outer sheath layer comprises the following components by weight: 90-110 parts of butyl rubber, 1-2 parts of a vulcanizing agent, 1-3 parts of an antioxidant, 3-5 parts of a lubricant, 6-10 parts of a flame retardant, and 15-20 parts of a filler. The flame retardant includes melamine, sodium silicate and zirconium phosphate.

[0007] As a further technical solution, the mass ratio of melamine, sodium silicate and zirconium phosphate is 7:7:3~5.

[0008] In the present invention, the flame retardancy of the high-strength power cable is further improved by adjusting the mass ratio of melamine, sodium silicate and zirconium phosphate to 7:7:3-5.

[0009] The mass ratio of melamine, sodium silicate and zirconium phosphate can be 7:7:3, 7:7:3.2, 7:7:3.4, 7:7:3.6, 7:7:3.8, 7:7:4, 7:7:4.2, 7:7:4.4, 7:7:4.6, 7:7:4.8, and 7:7:5.

[0010] As a further technical solution, the mass ratio of melamine, sodium silicate and zirconium phosphate is 7:7:4.

[0011] In the present invention, the flame retardancy of the high-strength power cable is further improved by adjusting the mass ratio of melamine, sodium silicate and zirconium phosphate to 7:7:4.

[0012] In the present invention, the mass ratio of melamine, sodium silicate and zirconium phosphate is preferably 7:7:4.

[0013] In the present invention, the mass ratio of melamine, sodium silicate and zirconium phosphate in the flame retardant is 7:7:3~5, and the synergistic effect of the flame retardant components is achieved through precise proportioning. The three form a flame retardant network through multiple mechanisms such as gas phase dilution and catalytic carbonization. When the mass ratio is controlled at 7:7:3~5, the gas release rate of melamine and the carbonization efficiency of sodium silicate and zirconium phosphate reach a dynamic balance. During combustion, an expanded carbon layer with both heat insulation and oxygen isolation functions can be quickly formed, effectively slowing down the spread of flames. At the same time, it avoids the problem of material mechanical properties degradation caused by excessive use of a single flame retardant. This proportioning system not only enables the cable to meet the halogen-free flame retardant standards, but also reduces the toxic gases released by the combustion of traditional halogen-containing flame retardants, meeting the dual requirements of environmental protection and safety, and is particularly suitable for power transmission in densely populated or environmentally sensitive areas.

[0014] As a further technical solution, the material of the insulating layer is cross-linked polyethylene.

[0015] As a further technical solution, the zirconium phosphate is a composite zirconium phosphate; The raw materials of the composite zirconium phosphate include zirconium phosphate and 4-hydroxybutyl vinyl ether.

[0016] In the present invention, composite zirconium phosphate is used to replace ordinary zirconium phosphate. By introducing 4-hydroxybutyl vinyl ether to intercalate the zirconium phosphate, the problem of poor compatibility between traditional layered fillers and the non-polar butyl rubber matrix is solved. The hydroxyl groups in the 4-hydroxybutyl vinyl ether molecules combine with the active groups on the surface of the zirconium phosphate, and the vinyl groups interact with the butyl rubber molecular chains, transforming the zirconium phosphate from a polar filler into amphiphilic particles with both polar and non-polar groups, significantly improving its dispersion uniformity in the rubber matrix. This modification not only retains the original catalytic carbonization and high-temperature resistance properties of the zirconium phosphate, but also enhances the interfacial bonding force, allowing the composite zirconium phosphate to be evenly distributed in the cable outer sheath layer, improving the tensile strength of the high-strength power cable and achieving a balance between flame retardancy and overall material performance.

[0017] As a further technical solution, the preparation method of the composite zirconium phosphate comprises the following steps: A1. Add zirconium phosphate to water to obtain a zirconium phosphate suspension; A2. Add 4-hydroxybutyl vinyl ether to water and stir to obtain a solution; A3. Add the dissolved solution to the zirconium phosphate suspension, stir, concentrate, and dry to obtain the composite zirconium phosphate.

[0018] In the present invention, zirconium phosphate is first dispersed in water to form a uniform suspension, thereby providing a sufficient contact interface for subsequent intercalation composite. After a solution of 4-hydroxybutyl vinyl ether is added, the stirring speed, temperature and time are controlled to allow the 4-hydroxybutyl vinyl ether to interact with hydroxyl groups on the surface of the zirconium phosphate. The prepared composite zirconium phosphate has a uniform particle size distribution, a stable intercalation composite effect, and significantly improved compatibility with a butyl rubber matrix, thereby achieving efficient dispersion of the flame retardant during cable processing and avoiding the problems of precipitation or agglomeration and poor mechanical properties of traditional fillers caused by surface polarity differences.

[0019] As a further technical solution, in step A1, the mass ratio of the zirconium phosphate to water is 1 g:15-20 mL; In step A2, the mass ratio of the 4-hydroxybutyl vinyl ether to water is 1 g:5-10 mL.

[0020] In the present invention, controlling the mass ratio of zirconium phosphate to water within 1 g:15 to 20 mL is a key parameter for ensuring that the zirconium phosphate is fully dispersed in water. Sufficient water allows the zirconium phosphate particles to maintain good fluidity during stirring, avoiding the formation of agglomerates due to excessively high concentration, thereby forming a stable suspension system. The stable suspension is a prerequisite for subsequent intercalation and composite, ensuring that 4-hydroxybutyl vinyl ether molecules can uniformly contact active sites on the surface of the zirconium phosphate, thereby improving the uniformity and efficiency of the intercalation and composite. If the amount of water is insufficient, the zirconium phosphate is not fully dispersed and is likely to form blocky precipitation, resulting in incomplete intercalation and composite. If the amount of water is too much, not only the cost of concentration and drying is increased, but also the intercalation and composite system may be diluted, thereby reducing the intercalation and composite rate.

[0021] As a further technical solution, the mass ratio of the zirconium phosphate to 4-hydroxybutyl vinyl ether is 100:3~5.

[0022] In the present invention, the mass ratio of zirconium phosphate to 4-hydroxybutyl vinyl ether can be 100:3, 100:3.2, 100:3.4, 100:3.6, 100:3.8, 100:4, 100:4.2, 100:4.4, 100:4.6, 100:4.8, or 100:5.

[0023] In the present invention, the mass ratio of zirconium phosphate to 4-hydroxybutyl vinyl ether is controlled within a range of 100:3-5, which directly affects the intercalation modification efficiency of zirconium phosphate. If the amount of 4-hydroxybutyl vinyl ether is insufficient (less than 3 parts), the surface active sites of the zirconium phosphate are not fully covered, and the compatibility with the butyl rubber matrix is not significantly improved. If the amount is too high (greater than 5 parts), the excess 4-hydroxybutyl vinyl ether molecules not only increase the material cost, but may also cause filler agglomeration due to excess polar groups, thereby reducing the dispersibility. Within the ratio range of 100:3-5, the 4-hydroxybutyl vinyl ether molecules can be uniformly compounded with the zirconium phosphate, thereby enhancing the tensile strength of the high-strength power cable and avoiding the negative impact of excessive modifier on system performance.

[0024] As a further technical solution, in step A3, during stirring, the rotation speed is 500-700 rpm, the temperature is 45-55° C., and the time is 3-4 h.

[0025] In the present invention, the stirring stage A3 controls the rotation speed to 500-700 rpm, the temperature to 45-55° C., and the time to 3-4 hours, which are key process parameters for ensuring sufficient compounding of 4-hydroxybutyl vinyl ether and zirconium phosphate. The medium-high speed stirring (500-700 rpm) provides sufficient shear force to keep the zirconium phosphate particles in the suspension in a dispersed state and avoid sedimentation, while promoting the migration of 4-hydroxybutyl vinyl ether molecules to the surface of the zirconium phosphate layered structure. The temperature range of 45-55° C. activates the hydroxyl activity on the surface of the zirconium phosphate, ensuring that the intercalation compounding is carried out efficiently under mild conditions. The reaction time of 3-4 hours provides sufficient time for the intercalation compounding, and the stable parameter control reduces the impact of process fluctuations on product performance, thereby ensuring the consistency and reliability of cable performance.

[0026] As a further technical solution, the vulcanizing agent includes one or both of di-tert-butyl peroxide and dicumyl peroxide.

[0027] In the present invention, the vulcanizing agent can be any one or more of conventional vulcanizing agents, and can be one or more of di-tert-butyl peroxide, dicumyl peroxide, tert-butyl perbenzoate, sulfur, preferably one or two of di-tert-butyl peroxide and dicumyl peroxide.

[0028] In the present invention, the vulcanizing agent imparts a three-dimensional network structure to the material through a chemical cross-linking reaction, thereby comprehensively improving the physical and mechanical properties, chemical stability and functional applicability. It can promote the formation of cross-linking structures such as covalent bonds, ionic bonds or hydrogen bonds between rubber or elastomer molecular chains, convert linear molecules into three-dimensional networks, and significantly enhance the mechanical properties of the material, so that the originally soft and viscoelastic polymer has stable elastic support and structural strength. The introduction of the vulcanizing agent can also inhibit the slippage of the molecular chain at high temperature and the swelling in the solvent, so that the power cable can maintain stable performance in a wide temperature range and complex chemical environment.

[0029] As a further technical solution, the antioxidant includes one or more of antioxidant MB, antioxidant RD, and antioxidant 264.

[0030] In the present invention, the antioxidant can be any one or more conventional antioxidants, and can be one or more of antioxidant NBC, antioxidant SP, antioxidant 330, antioxidant MD, antioxidant MB, antioxidant RD, and antioxidant 264, preferably one or more of antioxidant MB, antioxidant RD, and antioxidant 264.

[0031] In the present invention, the antioxidant delays or inhibits the aging process through multiple mechanisms such as chemical capture and physical barrier, significantly improving the stability of high-strength power cables in complex environments. Its core function is to resist aging inducements such as thermal oxygen, ozone, light, metal ions and mechanical fatigue. It can not only capture the active groups produced in the oxidation reaction and block the destructive chain reaction, but also form a protective film on the surface of the material to isolate ozone erosion, or passivate the metal ions that catalyze oxidation through chelation, thereby weakening the aging driving force from the source. The addition of the antioxidant greatly slows down the degradation rate of the polymer chain.

[0032] As a further technical solution, the lubricant includes one or both of zinc stearate and polyethylene wax.

[0033] In the present invention, the lubricant can be any one or more of conventional lubricants, and can be one or more of calcium stearate, magnesium stearate, paraffin, oxidized polyethylene wax, and butyl stearate, preferably one or two of zinc stearate and polyethylene wax.

[0034] In the present invention, the filler interacts with the interface through physical filling, giving the material more balanced comprehensive properties, allowing the product to withstand higher mechanical stress. In addition, the addition of the filler can effectively reduce production costs. The price of the filler is generally lower than that of the base material, and a large amount of filler can be filled, which greatly reduces the amount of polymer raw materials without significantly affecting the performance, making it suitable for large-scale industrial production.

[0035] As a further technical solution, the filler includes one or more of carbon black, talc, and kaolin.

[0036] In the present invention, the filler can be any one or more conventional fillers, and can be one or more of mica powder, calcium carbonate, diatomaceous earth, titanium dioxide, carbon black, talc, and kaolin, preferably one or more of carbon black, talc, and kaolin.

[0037] In the present invention, the lubricant can significantly improve the material processing performance and the quality of the finished product. The lubricant improves the processing fluidity by reducing the friction resistance between rubber molecules and between rubber and equipment, thereby increasing the extrusion rate and calendering uniformity, while reducing equipment energy consumption. In addition, the lubricant can optimize the surface quality of the finished high-strength power cable, reduce defects such as burrs and bubbles, reduce the scrap rate and improve the dispersion of fillers.

[0038] The present invention also provides a method for preparing a high-strength power cable, which is used to prepare the high-strength power cable, comprising the following steps: The raw materials of the outer sheath layer are mixed and kneaded, extruded onto the surface of the armor layer, and vulcanized to obtain the high-strength power cable.

[0039] The working principle and beneficial effects of the present invention are: In the present invention, the outer sheath layer adopts a butyl rubber matrix, and the flame retardant does not contain halogen components, which is more in line with the concept of environmental protection. The flame retardant is composed of melamine, sodium silicate, and zirconium phosphate. Melamine is used as a nitrogen-based flame retardant. It decomposes at high temperature to produce nitrogen and dilute the oxygen concentration. Sodium silicate is used as a silicon-based flame retardant. It forms a carbonized layer on the surface of the material during the combustion process. Zirconium phosphate is used as a phosphorus-based flame retardant. It promotes dehydration and carbonization of the material at high temperature. The three work synergistically to improve the flame retardancy of the high-strength power cable. This technology breaks through the bottleneck of poor flame retardancy of traditional high-strength power cables, is suitable for harsh environments such as high-voltage power transmission and rail transit, and provides a safe and reliable solution for power transmission systems. DETAILED DESCRIPTION

[0040] 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.

[0041] In the following examples and comparative examples, the model of butyl rubber is Yanshan Petrochemical 1751, the zirconium phosphate is layered zirconium phosphate with a particle size of 1 μm; the particle size of carbon black is 1250 mesh; the particle size of talc is 1250 mesh; and the particle size of kaolin is 1250 mesh.

[0042] Example 1 A high-strength power cable comprises, from the inside out, a core, an inner sheath, an armor layer, and an outer sheath layer. The core comprises, from the inside out, a conductor and a cross-linked polyethylene insulation layer. The outer sheath layer comprises the following components by weight: 110 parts of butyl rubber, 2 parts of di-tert-butyl peroxide, 3 parts of antioxidant MB, 5 parts of zinc stearate, 10 parts of flame retardant, 10 parts of carbon black, and 10 parts of talc. The flame retardant includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:8; A method for preparing a high-strength power cable comprises the following steps: Butyl rubber, di-tert-butyl peroxide, antioxidant MB, zinc stearate, flame retardant, carbon black and talc are mixed and kneaded, extruded on the surface of the armor layer, and vulcanized to obtain a high-strength power cable.

[0043] Example 2 A high-strength power cable comprises, from the inside out, a core, an inner sheath, an armor layer, and an outer sheath layer. The core comprises, from the inside out, a conductor and a cross-linked polyethylene insulation layer. The outer sheath layer comprises the following components by weight: 90 parts of butyl rubber, 1 part of dicumyl peroxide, 0.5 parts of antioxidant RD, 0.5 parts of antioxidant MB, 3 parts of polyethylene wax, 6 parts of flame retardant, and 15 parts of talc. The flame retardant includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:1.

[0044] A method for preparing a high-strength power cable comprises the following steps: Butyl rubber, dicumyl peroxide, antioxidant RD, antioxidant MB, polyethylene wax, flame retardant and talc are mixed and kneaded, extruded on the surface of the armor layer, and vulcanized to obtain a high-strength power cable.

[0045] Example 3 A high-strength power cable comprises, from the inside out, a core, an inner sheath, an armor layer, and an outer sheath layer. The core comprises, from the inside out, a conductor and a cross-linked polyethylene insulation layer. The outer sheath layer comprises the following components by weight: 100 parts of butyl rubber, 1.5 parts of di-tert-butyl peroxide, 2 parts of antioxidant 264, 4 parts of zinc stearate, 8 parts of flame retardant, and 18 parts of kaolin. The flame retardant includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:6; A method for preparing a high-strength power cable comprises the following steps: Butyl rubber, di-tert-butyl peroxide, antioxidant 264, zinc stearate, flame retardant and kaolin are mixed and kneaded, extruded on the surface of the armor layer, and vulcanized to obtain a high-strength power cable.

[0046] Example 4 The only difference between this embodiment and embodiment 3 is that the flame retardant in this embodiment includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:2.

[0047] Example 5 The only difference between this embodiment and embodiment 3 is that the flame retardant in this embodiment includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:3.

[0048] Example 6 The only difference between this embodiment and embodiment 3 is that the flame retardant in this embodiment includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:4.

[0049] Example 7 The only difference between this embodiment and embodiment 3 is that the flame retardant in this embodiment includes melamine, sodium silicate and zirconium phosphate in a mass ratio of 7:7:5.

[0050] Example 8 The only difference between this embodiment and embodiment 6 is that the zirconium phosphate in this embodiment is replaced by composite zirconium phosphate of equal mass. The preparation method of zirconium phosphate includes the following steps: A1. Add zirconium phosphate to water (mass ratio of zirconium phosphate to water is 1 g:20 mL) to obtain a zirconium phosphate suspension; A2. Add 4-hydroxybutyl vinyl ether to water (the mass ratio of 4-hydroxybutyl vinyl ether to water is 1 g:10 mL) and stir to obtain a solution; A3. Add the dissolved liquid to the zirconium phosphate suspension (the mass ratio of zirconium phosphate to 4-hydroxybutyl vinyl ether is 20:1), stir until the 4-hydroxybutyl vinyl ether is dissolved, and then stir at 55° C. and 700 rpm for 3 h. Concentrate and dry to obtain the composite zirconium phosphate.

[0051] Example 9 The only difference between this embodiment and embodiment 6 is that the zirconium phosphate in this embodiment is replaced by composite zirconium phosphate of equal mass. The preparation method of zirconium phosphate includes the following steps: A1. Add zirconium phosphate to water (mass ratio of zirconium phosphate to water is 1 g:15 mL) to obtain a zirconium phosphate suspension; A2. Add 4-hydroxybutyl vinyl ether to water (the mass ratio of 4-hydroxybutyl vinyl ether to water is 1 g:5 mL) and stir to obtain a solution; A3. Add the dissolved liquid to the zirconium phosphate suspension (the mass ratio of zirconium phosphate to 4-hydroxybutyl vinyl ether is 100:3), stir until the 4-hydroxybutyl vinyl ether is dissolved, and then stir at 45° C. and 500 rpm for 4 hours. Concentrate and dry to obtain the composite zirconium phosphate.

[0052] Comparative Example 1 The only difference between this comparative example and Example 3 is that the flame retardant in this comparative example is melamine and sodium silicate in a mass ratio of 7:7.

[0053] Comparative Example 2 The only difference between this comparative example and Example 3 is that the flame retardant in this comparative example is sodium silicate and zirconium phosphate in a mass ratio of 7:6.

[0054] Comparative Example 3 The only difference between this comparative example and Example 3 is that the flame retardant in this comparative example is melamine and zirconium phosphate in a mass ratio of 7:6.

[0055] Experimental Example 1 The oxygen index of the sheath layers of the high-strength power cables prepared in Examples 1 to 7 and Comparative Examples 1 to 3 was tested according to the method specified in GB / T 2406.2-2009, "Determination of Combustion Behavior of Plastics by Oxygen Index Method - Part 2: Room Temperature Test." The test results are shown in Table 1.

[0056] Table 1 Oxygen index test results

[0057] As shown in Table 1, the oxygen index of the high-strength power cables prepared in Examples 1 to 7 of the present invention reaches above 31.2%. Therefore, in the present invention, melamine, sodium silicate and zirconium phosphate are used as flame retardants, and the three act synergistically to improve the flame retardancy of the high-strength power cables.

[0058] Experimental Example 2 The sheath layers of the high-strength power cables produced in Examples 6 and 8-9 were tested for tensile strength according to the method specified in GB / T 528-2009, "Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties." The test specimens were dumbbell-shaped, Type 1, and the tensile speed was 500 mm / min. The test results are shown in Table 2.

[0059] Table 2 Tensile strength test results

[0060] As shown in Table 2, the tensile strength of the high-strength power cables prepared in Examples 8 to 9 of the present invention reaches above 17.5 MPa. Therefore, in the present invention, composite zirconium phosphate is used to replace zirconium phosphate, thereby improving the tensile strength of the high-strength power cables.

[0061] Experimental Example 3 The sheath layers of the high-strength power cables prepared in Examples 6 and 8-9 were tested for abrasion according to the method specified in GB / T 9867-2008, "Vulcanized or thermoplastic rubber - Determination of wear resistance (rotating roller abrader method)." The test results are shown in Table 3.

[0062] Table 3 Wear test results

[0063] It can be seen from Table 3 that the high-strength power cable produced by the present invention can meet actual use requirements.

[0064] 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 high-strength power cable, characterized in that: From the inside to the outside, the core, inner sheath, armor layer and outer sheath layer are arranged in sequence. The core includes a conductor and an insulation layer in sequence from the inside to the outside. The outer sheath layer comprises the following components by weight: 90-110 parts of butyl rubber, 1-2 parts of a vulcanizing agent, 1-3 parts of an antioxidant, 3-5 parts of a lubricant, 6-10 parts of a flame retardant and 15-20 parts of a filler. The flame retardant includes melamine, sodium silicate and zirconium phosphate.

2. A high-strength power cable according to claim 1, characterized in that: The mass ratio of the melamine, sodium silicate and zirconium phosphate is 7:7:3-5.

3. A high-strength power cable according to claim 2, characterized in that: The material of the insulating layer is cross-linked polyethylene.

4. A high-strength power cable according to any one of claims 1 to 3, characterized in that: The zirconium phosphate is a composite zirconium phosphate; The raw materials of the composite zirconium phosphate include zirconium phosphate and 4-hydroxybutyl vinyl ether.

5. A high-strength power cable according to claim 4, characterized in that: The preparation method of the composite zirconium phosphate comprises the following steps: A1. Add zirconium phosphate to water to obtain a zirconium phosphate suspension; A2. Add 4-hydroxybutyl vinyl ether to water and stir to obtain a solution; A3. Add the dissolved solution to the zirconium phosphate suspension, stir, concentrate, and dry to obtain the composite zirconium phosphate.

6. A high-strength power cable according to claim 5, characterized in that: In step A1, the mass ratio of the zirconium phosphate to water is 1 g:15-20 mL; In step A2, the mass ratio of the 4-hydroxybutyl vinyl ether to water is 1 g:5-10 mL.

7. A high-strength power cable according to claim 5, characterized in that: The mass ratio of the zirconium phosphate to 4-hydroxybutyl vinyl ether is 100:3-5.

8. The high-strength power cable according to claim 5, characterized in that: In step A3, the stirring speed is 500-700 rpm, the temperature is 45-55° C., and the time is 3-4 hours.

9. The high-strength power cable according to claim 1, characterized in that: The vulcanizing agent includes one or two of di-tert-butyl peroxide and dicumyl peroxide; The antioxidant includes one or more of antioxidant MB, antioxidant RD, and antioxidant 264; The lubricant includes one or both of zinc stearate and polyethylene wax.

10. The high-strength power cable according to claim 1, characterized in that: The filler includes one or more of carbon black, talc, and kaolin.

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