Anti-electromagnetic interference power cable and preparation method thereof

Abstract

The invention discloses an anti-electromagnetic interference power cable and a preparation method thereof, and relates to the technical field of cables. According to the invention, crosslinked polyethylene modified by sodium (4-vinyl phenyl) methanesulfonate is taken as a raw material, so that the corrosion-resistant effect is achieved; after being uniformly mixed with acrylate and auxiliaries, the mixture is sprayed for the first time at a high temperature, an insulating layer is formed outside the conductor, and the service life of the cable is prolonged; and then the binder, the composite particles and the copper nano powder are mixed for secondary spraying to form a composite outer shielding layer with a lotus leaf-like upper skin structure, so that the anti-corrosion effect is achieved, and the electromagnetic shielding effect can be enhanced. According to the composite particles, zinc sulfate heptahydrate, 5-nitrobenzimidazole and lactamidopropyl trimethyl ammonium chloride react to form a ZIF-8 structure loaded with lactamidopropyl trimethyl ammonium chloride, so that the effects of wear resistance and electromagnetic interference resistance are achieved, the compatibility between inorganic particles and a polymer matrix is improved, and a good flame-retardant effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to an anti-electromagnetic interference power cable and a preparation method thereof. Background Art

[0002] In the fields of modern industry and power transmission, anti-electromagnetic interference power cables play a crucial role. With the wide application of electronic devices and the continuous development of power systems, the performance requirements for power cables are becoming increasingly stringent. In numerous complex application environments, such as the chemical and metallurgical industries, there are a large number of corrosive substances in the environment where the cables are located, including various acid-base gases, liquids, etc. However, when the existing anti-electromagnetic interference power cables face these corrosive media, their protective layers and internal structures are often difficult to resist erosion, resulting in a decline in the insulation performance of the cables, corrosion of the metal conductors, and thus affecting the stability and safety of power transmission.

[0003] At the same time, due to being exposed outdoors for a long time or being subjected to mechanical external forces, the cables are prone to abrasion. Conventional anti-electromagnetic interference power cables perform poorly in terms of abrasion resistance, and the surface protective layer is easily scratched and damaged, exposing the internal structure directly, accelerating the aging and damage of the cables, and greatly shortening their service life. Moreover, the short service life of the cables not only increases the replacement and maintenance costs, but also the frequent repair and replacement operations will affect the continuity of power supply, bringing many inconveniences and potential losses to production and life. These problems limit the application of anti-electromagnetic interference power cables in more scenarios, and there is an urgent need to develop new technologies and materials to solve these drawbacks. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-electromagnetic interference power cable and a preparation method thereof to solve the problems existing in the prior art.

[0005] To solve the above technical problems, the present invention provides the following technical solution: An anti-electromagnetic interference power cable, the anti-electromagnetic interference power cable includes a conductor, a modified cross-linked polyethylene insulation coating, a lotus-leaf-like organic-inorganic composite shielding coating, and a modified cross-linked polyethylene sheath layer; the modified cross-linked polyethylene is prepared from sodium (4-vinylphenyl) methanesulfonate modified cross-linked polyethylene.

[0006] Further, the modified cross-linked polyethylene insulation coating is prepared by mixing modified cross-linked polyethylene, a binder, and an auxiliary agent into pellets and then subjecting them to high-temperature spraying.

[0007] Further, the lotus-leaf-like organic-inorganic composite shielding coating is prepared by spraying a composite particle prepared from zinc sulfate heptahydrate, 5-nitrobenzimidazole, and lauramidopropyl trimethyl ammonium chloride, mixed with a binder and copper nanoflakes.

[0008] Further, a preparation method of an anti-electromagnetic interference power cable includes the following preparation steps:

[0009] (1) Mix 15 - 21 parts of cross-linked polyethylene with a molecular weight of 80,000 - 150,000, 11 - 17 parts of (4-vinylphenyl)methanesulfonate, and 0.1 - 0.2 parts of peroxide initiator evenly, and carry out melt blending at 125 - 135°C for 30 - 60 min, then naturally cool to room temperature to obtain modified cross-linked polyethylene.

[0010] (2) Mix 36 - 52 parts of composite particles, 14 - 26 parts of acrylate binder, and 20 - 30 parts of copper nanoflakes with a particle size of 50 - 150 nm at an ultrasonic frequency of 24 - 30 kHz and a stirring speed of 80 rpm for 5 - 15 min to obtain a shielding layer mixture.

[0011] (3) Place the modified cross-linked polyethylene particles in a spraying machine and evenly spray them on the surface of a copper conductor with a cross-sectional area of 0.5 - 50 mm 2 at 120 - 150°C, then naturally cool to 30°C to form a modified cross-linked polyethylene insulation coating. Subsequently, spray the shielding layer mixture to form a lotus leaf-like organic-inorganic composite shielding coating. After drying at 30 - 40°C for 24 - 36 h, extrude the modified cross-linked polyethylene particles around the shielding layer at 150 - 170°C and then naturally cool to room temperature to obtain the anti-electromagnetic interference power cable.

[0012] Further, the peroxide initiator in step (1) is any one or a mixture of benzoyl peroxide, sodium persulfate, and tert-butyl peroxybenzoate.

[0013] Further, the preparation steps of the composite particles in step (2) are as follows: Mix 5 - 13 parts of zinc sulfate heptahydrate and 60 - 140 parts of deionized water evenly, add a mixed solution composed of 8 - 22 parts of 5-nitrobenzimidazole, 0.5 - 1.5 parts of lactamide propyl trimethyl ammonium chloride, and 95 - 210 parts of methanol, stir at 100 rpm for 10 - 20 min, then transfer to a centrifuge and centrifuge at 10,000 rpm for 5 - 15 min, collect the solid, wash it alternately with methanol and deionized water twice, and place it in an oven at 30 - 40°C to dry for 18 - 24 h to obtain the composite particles.

[0014] Further, the spraying conditions in step (3) are: the moving speed of the spray gun is 550 - 750 mm / s, the current is 1400 A - 1600 A, and the spraying distance is 500 - 700 mm.

[0015] Further, the preparation steps of the modified cross-linked polyethylene particles in step (3) are as follows: Put 51-77 parts of modified cross-linked polyethylene, 12-18 parts of acrylate binder, and 1-2 parts of 2,6-di-tert-butyl-4-methylphenol into an internal mixer, and carry out internal mixing at 140-180 °C for 10-20 min, then pelletize to obtain the modified cross-linked polyethylene particles.

[0016] Further, the thickness of the modified cross-linked polyethylene insulating coating in step (3) is 0.5-5 mm.

[0017] Further, the thickness of the lotus-leaf-like organic-inorganic composite shielding coating in step (3) is 0.1-1.2 mm.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0019] The present invention uses cross-linked polyethylene modified with sodium (4-vinylphenyl) methanesulfonate as the raw material, introduces sulfonate groups, weakens the displacement reaction between acidic media and the cable, neutralizes alkaline substances, enhances the intermolecular interaction, reduces the porosity, and thus strengthens the corrosion resistance effect; then it is mixed evenly with acrylate and additives and sprayed for the first time at high temperature to form an insulating layer outside the conductor. The insulating layer can fit irregular surfaces and has good flexibility. When the cable deforms or vibrates, the insulating coating can deform accordingly, maintain good insulation performance, and is not prone to problems such as cracking and peeling, thereby extending the service life of the cable. In addition, while resisting electromagnetic interference, it can also act as an intermediate layer to bond the conductor and the shielding layer; then, through the secondary spraying of the binder, composite particles, and copper nanoflakes, a composite outer shielding layer with a lotus-leaf-like upper epidermal structure is formed. While preventing corrosive liquids from entering the polymer molecular chains and achieving the anti-corrosion effect, it can also enhance the electromagnetic shielding effect.

[0020] The composite particles are formed by the reaction of zinc sulfate heptahydrate, 5-nitrobenzimidazole, and lauramidopropyl trimethyl ammonium chloride to form a ZIF-8 structure loaded with lauramidopropyl trimethyl ammonium chloride, which has certain flexibility and dynamic reversibility. When the cable material wears to generate tiny cracks or defects, the coordination bonds in the ZIF-8 structure break and re-coordinate, restoring the original crystal structure and morphology, thereby achieving the anti-wear effect. At the same time, using the capillary adsorption effect of ZIF-8 and cooperating with the hydroxyl groups in lauramidopropyl trimethyl ammonium chloride, it can form a complex with metals to achieve the loading effect. When electromagnetic radiation is incident, a large number of active sites and interfaces can be provided, and the electromagnetic wave will continuously reflect, scatter, and refract in these porous structures, thereby achieving the anti-electromagnetic interference effect, and improving the compatibility between the inorganic particles and the polymer matrix, thus reducing the agglomeration phenomenon between the inorganic particles, enabling them to be more uniformly dispersed in the polymer, indirectly improving the comprehensive performance of the cable material. In addition, during the combustion of the cable, the composite particles can form a continuous and dense barrier layer to reduce the transfer of heat and oxygen, thereby achieving a good flame retardant effect. Detailed implementation mode

[0021] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0022] In order to more clearly illustrate the method provided by the present invention, the following examples are used for detailed description. The test methods for each index of the anti-electromagnetic interference power cable manufactured in the following examples are as follows:

[0023] Tensile strength: Take the same mass of the examples and the comparative examples, and test them according to the regulations in GB / T 8804.2.

[0024] Abrasion loss: Take the same mass of the examples and the comparative examples, and test them according to GB / T 2951-2008.

[0025] Corrosion resistance test: Take the same mass of the examples and the comparative examples, and make plastic block specimens of the same size. Take three clean beakers, respectively prepare 10% concentration hydrochloric acid and 10% concentration NaOH solutions, immerse the specimens in the prepared solutions respectively, keep the sealed environment for 45 days, and then take out the specimens to observe the corrosion situation on the surface.

[0026] Flame retardant grade: Take the same mass of the examples and the comparative examples, and test them according to GB / T 19666-2019.

[0027] Shielding efficiency: Take the same mass of the examples and comparative examples, with the thickness of the uniformly sprayed shielding layer being 0.1 mm, test the shielding efficiency of the cable and record it.

[0028] Example 1

[0029] (1) Mix 15 parts of crosslinked polyethylene with a molecular weight of 80,000, 11 parts of sodium (4-vinylphenyl) methanesulfonate, and 0.1 part of dibenzoyl peroxide evenly, and carry out melt blending at 125 °C for 30 min, then cool naturally to room temperature to obtain modified crosslinked polyethylene.

[0030] (2) Mix 5 parts of zinc sulfate heptahydrate and 60 parts of deionized water evenly, add the mixture of 8 parts of 5-nitrobenzimidazole, 0.5 part of lactamide propyl trimethyl ammonium chloride, and 95 parts of methanol, stir at 100 rpm for 10 min, then transfer to a centrifuge and centrifuge at 10,000 rpm for 5 min, collect the solid, wash it alternately with methanol and deionized water twice, and place it in an oven at 30 °C to dry for 18 h to obtain composite particles.

[0031] (3) Mix 36 parts of composite particles, 14 parts of acrylate binder, and 20 parts of copper nanoflakes with a particle size of 50 nm at an ultrasonic frequency of 24 kHz and a stirring speed of 80 rpm for 5 min to obtain a shielding layer mixture.

[0032] (4) Put 51 parts of modified crosslinked polyethylene, 12 parts of acrylate binder, and 1 part of 2,6-di-tert-butyl-4-methylphenol into an internal mixer, carry out internal mixing at 140 °C for 10 min, and pelletize to obtain modified crosslinked polyethylene particles.

[0033] (5) Place the modified crosslinked polyethylene particles in a spraying machine, and spray them evenly on the surface of a copper conductor with a cross-sectional area of 0.5 mm at a spray gun moving speed of 550 mm / s, a current of 1400 A, and a spraying distance of 500 mm at 120 °C, cool naturally to 30 °C to form a modified crosslinked polyethylene insulating coating with a thickness of 0.5 mm, then spray the shielding layer mixture to form a lotus leaf-like organic-inorganic composite shielding coating with a thickness of 0.1 mm. After drying at 30 °C for 24 h, extrude the modified crosslinked polyethylene particles around the shielding layer at 150 °C and cool naturally to room temperature to obtain an anti-electromagnetic interference power cable. 2

[0034] Example 2

[0035] (1) Mix 18 parts of crosslinked polyethylene with a molecular weight of 115,000, 14 parts of sodium (4-vinylphenyl) methanesulfonate, and 0.15 part of sodium persulfate evenly, and carry out melt blending at 130 °C for 45 min, then cool naturally to room temperature to obtain modified crosslinked polyethylene.

[0036] (2) Mix 9 parts of zinc sulfate heptahydrate and 100 parts of deionized water evenly, add the mixed solution composed of 15 parts of 5-nitrobenzimidazole, 1 part of lactamide propyl trimethyl ammonium chloride and 152 parts of methanol, stir at 100 rpm for 15 min, then transfer to a centrifuge and centrifuge at 10,000 rpm for 10 min. Collect the solid, wash it alternately with methanol and deionized water twice, place it in an oven at 35 °C and dry for 21 h to obtain composite particles;

[0037] (3) Mix 44 parts of composite particles, 20 parts of acrylate binder and 25 parts of copper nanoflakes with a particle size of 100 nm at an ultrasonic frequency of 27 kHz and a stirring speed of 80 rpm for 10 min to obtain a shielding layer mixture;

[0038] (4) Put 64 parts of modified cross-linked polyethylene, 15 parts of acrylate binder and 1.5 parts of 2,6-di-tert-butyl-4-methylphenol into an internal mixer, knead at 160 °C for 15 min, and pelletize to obtain modified cross-linked polyethylene particles;

[0039] (5) Place the modified cross-linked polyethylene particles in a spraying machine, and spray evenly on the surface of a copper conductor with a cross-sectional area of 25 mm at a spray gun moving speed of 650 mm / s, a current of 1500 A and a spraying distance of 600 mm at 135 °C. Cool naturally to 30 °C to form a modified cross-linked polyethylene insulating coating with a thickness of 2.75 mm. Then spray the shielding layer mixture to form a lotus-leaf-like organic-inorganic composite shielding coating with a thickness of 0.65 mm. After drying at 35 °C for 30 h, extrude the modified cross-linked polyethylene particles around the shielding layer at 160 °C and cool naturally to room temperature to obtain an anti-electromagnetic interference power cable. 2

[0040] Example 3

[0041] (1) Mix 21 parts of cross-linked polyethylene with a molecular weight of 150,000, 17 parts of (4-vinylphenyl) methanesulfonate and 0.2 part of tert-butyl peroxybenzoate evenly, melt-blend at 135 °C for 60 min, and cool naturally to room temperature to obtain modified cross-linked polyethylene;

[0042] (2) Mix 13 parts of zinc sulfate heptahydrate and 140 parts of deionized water evenly, add the mixed solution composed of 22 parts of 5-nitrobenzimidazole, 1.5 parts of lactamide propyl trimethyl ammonium chloride and 210 parts of methanol, stir at 100 rpm for 20 min, then transfer to a centrifuge and centrifuge at 10,000 rpm for 15 min. Collect the solid, wash it alternately with methanol and deionized water twice, place it in an oven at 40 °C and dry for 24 h to obtain composite particles;

[0043] ​(3) Mix 52 parts of composite particles, 26 parts of acrylate binder, and 30 parts of copper nanoflakes with a particle size of 150 nm under an ultrasonic frequency of 30 kHz and a stirring speed of 80 rpm for 15 min to obtain a shielding layer mixture;

[0044] (4) Place 77 parts of modified cross-linked polyethylene, 18 parts of acrylate binder, and 2 parts of 2,6-di-tert-butyl-4-methylphenol in an internal mixer and knead at 180 °C for 20 min, then pelletize to obtain modified cross-linked polyethylene particles;

[0045] (5) Place the modified cross-linked polyethylene particles in a spraying machine and spray them evenly on the surface of a copper conductor with a cross-sectional area of 50 mm 2 at a spray gun moving speed of 750 mm / s, a current of 1600 A, and a spraying distance of 700 mm at 150 °C. Let it cool naturally to 30 °C to form a modified cross-linked polyethylene insulating coating with a thickness of 5 mm. Then spray the shielding layer mixture to form a lotus-leaf-like organic-inorganic composite shielding coating with a thickness of 1.2 mm. After drying in an environment at 40 °C for 36 h, extrude the modified cross-linked polyethylene particles around the shielding layer at 170 °C and let it cool naturally to room temperature to obtain an electromagnetic interference-resistant power cable.

[0046] Comparative Example 1

[0047] The difference between Comparative Example 1 and Example 2 is that cross-linked polyethylene is not modified using sodium (4-vinylphenyl) methanesulfonate. The remaining steps are the same as those in Example 2.

[0048] Comparative Example 2

[0049] The difference between Comparative Example 2 and Example 2 lies in step (5). Step (5) is modified as follows: Extrude the modified cross-linked polyethylene particles on the surface of a copper conductor with a cross-sectional area of 25 mm 2 at 160 °C and let it cool naturally to 30 °C to form a modified cross-linked polyethylene insulating coating with a thickness of 2.75 mm. Then spray the shielding layer mixture to form a lotus-leaf-like organic-inorganic composite shielding coating with a thickness of 0.65 mm. After drying in an environment at 35 °C for 30 h, extrude the modified cross-linked polyethylene particles around the shielding layer at 160 °C and let it cool naturally to room temperature to obtain an electromagnetic interference-resistant power cable. The remaining steps are the same as those in Example 2.

[0050] Comparative Example 3

[0051] The difference between Comparative Example 3 and Example 2 lies in step (5). Step (5) is modified as follows: Place the modified cross-linked polyethylene particles in a spraying machine and spray them evenly on the surface of a copper conductor with a cross-sectional area of 25 mm 2On the surface of the copper conductor, it was naturally cooled to 30 °C to form a modified cross-linked polyethylene insulating coating with a thickness of 2.75 mm. Subsequently, a copper wire shielding layer was woven by a knitting machine, and then the modified cross-linked polyethylene particles were extruded around the shielding layer at 160 °C and naturally cooled to room temperature to obtain an anti-electromagnetic interference power cable. The remaining steps were the same as those in Example 2.

[0052] Comparative Example 4

[0053] The difference between Comparative Example 4 and Example 2 was that step (2) was absent, and step (3) was changed to: 44 parts of lauramidopropyl trimethyl ammonium chloride, 20 parts of acrylate binder, and 25 parts of copper nanoflakes with a particle size of 100 nm were mixed for 10 min under an ultrasonic frequency of 27 kHz and a stirring speed of 80 rpm to obtain a shielding layer mixture. The remaining steps were the same as those in Example 2.

[0054] Comparative Example 5

[0055] The difference between Comparative Example 5 and Example 2 was in step (2). Step (2) was changed to: 9 parts of zinc sulfate heptahydrate and 100 parts of deionized water were mixed evenly, and a mixed solution composed of 15 parts of 5-nitrobenzimidazole and 152 parts of methanol was added. The mixture was stirred at 100 rpm for 15 min, then transferred to a centrifuge and centrifuged at 10,000 rpm for 10 min. The solid was collected, washed alternately with methanol and deionized water twice, and dried in an oven at 35 °C for 21 h to obtain composite particles. The remaining steps were the same as those in Example 2.

[0056] Effect Example

[0057] The following Table 1 shows the performance analysis results of the anti-electromagnetic interference power cables of Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention.

[0058] Table 1

[0059]

[0060] From the comparison of the experimental data of Examples 1, 2, 3 and Comparative Example 1, it can be found that by modifying cross-linked polyethylene with sodium (4-vinylphenyl) methanesulfonate, introducing sulfonate groups, weakening the displacement reaction between the acidic medium and the cable, neutralizing alkaline substances, enhancing the interaction between molecular chains, reducing the porosity, and strengthening the corrosion resistance effect; from the comparison of the experimental data of Examples 1, 2, 3 and Comparative Example 2, it can be found that by spraying to form an insulating layer at high temperature, it can fit irregular surfaces, has good flexibility, when the cable deforms or vibrates, the insulating coating can deform accordingly, maintain good insulation performance, and is not prone to problems such as cracking and peeling, prolonging the service life of the cable. In addition, while resisting electromagnetic interference, it can act as an intermediate layer to bond the conductor and the shielding layer; from the comparison of the experimental data of Examples 1, 2, 3 and Comparative Example 3, it can be found that by mixing the binder with composite particles and copper nanoflakes for secondary spraying, a composite outer shielding layer with a structure similar to the upper epidermis of a lotus leaf is formed. While preventing corrosive liquids from entering the polymer molecular chains and achieving the anti-corrosion effect, it can also enhance the electromagnetic shielding effect; from the comparison of the experimental data of Examples 1, 2, 3 and Comparative Examples 4 and 5, it can be found that by reacting zinc sulfate heptahydrate, 5-nitrobenzimidazole, and lauramidopropyltrimethylammonium chloride to form a ZIF-8 structure loaded with lauramidopropyltrimethylammonium chloride, it has certain flexibility and dynamic reversibility. When microcracks or defects occur due to wear in the cable material, the coordination bonds in the ZIF-8 structure break and re-coordinate to restore the original crystal structure and morphology, thus achieving the anti-wear effect. At the same time, using the capillary adsorption effect of ZIF-8 and cooperating with the hydroxyl groups in lauramidopropyltrimethylammonium chloride, it can form a complex with the metal to achieve the loading effect. When electromagnetic radiation is incident, it can provide a large number of active sites and interfaces, and the electromagnetic wave will be continuously reflected, scattered and refracted in these porous structures, thereby achieving the effect of resisting electromagnetic interference, improving the compatibility between inorganic particles and the polymer matrix, reducing the agglomeration phenomenon between inorganic particles, enabling them to be more evenly dispersed in the polymer, indirectly improving the comprehensive performance of the cable material. In addition, during the combustion of the cable, the composite particles can form a continuous and dense barrier layer to reduce the transfer of heat and oxygen, thereby achieving a good flame retardant effect.

[0061] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. An anti-electromagnetic interference power cable, characterized in that, The anti-electromagnetic interference power cable includes a conductor, a modified cross-linked polyethylene insulation coating, a lotus-leaf-like organic-inorganic composite shielding coating, and a modified cross-linked polyethylene sheath layer; the modified cross-linked polyethylene is prepared from sodium (4-vinylphenyl) methanesulfonate modified cross-linked polyethylene.

2. The anti-electromagnetic interference power cable according to claim 1, wherein The modified cross-linked polyethylene insulation coating is prepared by mixing modified cross-linked polyethylene, a binder, and an auxiliary agent into pellets and then spray-coating at a high temperature.

3. The anti-electromagnetic interference power cable according to claim 1, wherein, The lotus-leaf-like organic-inorganic composite shielding coating is prepared by spraying a mixture of composite particles prepared from zinc sulfate heptahydrate, 5-nitrobenzimidazole, and lauramidopropyltrimethylammonium chloride, a binder, and copper nanoflakes.

4. A preparation method of an anti-electromagnetic interference power cable, characterized in that, It includes the following preparation steps: (1) Mix 15-21 parts of cross-linked polyethylene with a molecular weight of 80,000-150,000, 11-17 parts of sodium (4-vinylphenyl) methanesulfonate, and 0.1-0.2 parts of a peroxide initiator evenly, and carry out melt blending at 125-135 °C for 30-60 min, then naturally cool to room temperature to obtain modified cross-linked polyethylene. (2) Mix 36-52 parts of composite particles, 14-26 parts of an acrylate binder, and 20-30 parts of copper nanoflakes with a particle size of 50-150 nm at an ultrasonic frequency of 24-30 kHz and a stirring speed of 80 rpm for 5-15 min to obtain a shielding layer mixture. (3) Place the modified cross-linked polyethylene particles in a spraying machine and evenly spray them on the surface of a copper conductor with a cross-sectional area of 0.5 - 50 mm 2 at 120 - 150 °C. Naturally cool to 30 °C to form a modified cross-linked polyethylene insulation coating. Subsequently, spray the shielding layer mixture to form a lotus-leaf-like organic-inorganic composite shielding coating. After drying at 30 - 40 °C for 24 - 36 h, extrude the modified cross-linked polyethylene particles around the shielding layer at 150 - 170 °C and naturally cool to room temperature to obtain the electromagnetic interference-resistant power cable.

5. The preparation method of an anti-electromagnetic interference power cable according to claim 4, characterized in that, The peroxide initiator in step (1) is any one or a mixture of benzoyl peroxide, sodium persulfate, and tert-butyl peroxybenzoate.

6. The preparation method of an anti-electromagnetic interference power cable according to claim 4, characterized in that, The preparation steps of the composite particles in step (2) are as follows: Mix 5-13 parts of zinc sulfate heptahydrate and 60-140 parts of deionized water evenly, add a mixed solution of 8-22 parts of 5-nitrobenzimidazole, 0.5-1.5 parts of lauramidopropyltrimethylammonium chloride, and 95-210 parts of methanol, stir at 100 rpm for 10-20 min, then transfer to a centrifuge and centrifuge at 10,000 rpm for 5-15 min, collect the solid, wash it alternately with methanol and deionized water twice, and dry it in an oven at 30-40 °C for 18-24 h to obtain composite particles.

7. The preparation method of an anti-electromagnetic interference power cable according to claim 4, characterized in that, The spraying conditions in step (3) are: the moving speed of the spray gun is 550-750 mm / s, the current is 1400 A-1600 A, and the spraying distance is 500-700 mm.

8. The preparation method of an anti-electromagnetic interference power cable according to claim 4, characterized in that, The preparation steps of the modified cross-linked polyethylene particles in step (3) are as follows: Put 51-77 parts of modified cross-linked polyethylene, 12-18 parts of an acrylate binder, and 1-2 parts of 2,6-di-tert-butyl-4-methylphenol into a mixer, knead at 140-180 °C for 10-20 min, and pelletize to obtain modified cross-linked polyethylene particles.

9. The preparation method of an anti-electromagnetic interference power cable according to claim 4, characterized in that, The thickness of the modified cross-linked polyethylene insulation coating in step (3) is 0.5-5 mm.

10. The preparation method of an anti-electromagnetic interference power cable according to claim 4, characterized in that, The thickness of the lotus-leaf-like organic-inorganic composite shielding coating in step (3) is 0.1-1.2 mm.

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