High toughness composite cable and method of making same

Abstract

The application relates to a high-toughness composite cable and a preparation method thereof, and belongs to the technical field of cables. The high-toughness composite cable comprises a cable body and a sheath layer arranged on the cable body, and the sheath layer comprises the following components: polypropylene, an organic modified filler and an additive; the additive is composed of a lubricant, an antioxidant and an ultraviolet resistant agent; the application is compounded by carbon nanotubes and zinc oxide, and the carbon nanotubes and the zinc oxide are organically modified to form an organic coating structure; finally, GMA, styrene and PP are melt-extruded to improve the bending strength and wear resistance of the polypropylene cable material.

Description

Technical Field

[0001] This invention belongs to the technical field of cables, and relates to a high-toughness composite cable and its preparation method. Background Technology

[0002] Polypropylene composites are widely used in cable materials due to their excellent impact resistance and chemical corrosion resistance. Introducing fillers such as inorganic fibers, natural fibers, and hollow glass beads into the polypropylene matrix can significantly improve its heat resistance and low-temperature impact performance. However, as a non-polar material without functional groups, polypropylene presents significant interfacial compatibility issues with polar fillers, leading to unsatisfactory mechanical properties in the composites. To address this problem, two strategies are typically employed: one is to modify the surface of the filler, such as through chemical treatment or the addition of interfacial compatibilizers, to reduce interfacial energy and enhance interfacial interactions; the other is to optimize the composite material preparation process to improve the interfacial compatibility between the filler and the polypropylene matrix, thereby enhancing the overall mechanical properties of the material. Summary of the Invention

[0003] The purpose of this invention is to provide a high-toughness composite cable and its preparation method. This invention improves the dispersibility of zinc oxide and carbon nanotubes by generating zinc oxide in situ on carbon nanotubes, then modifies it with a silane coupling agent, and grafts it with mercaptosuccinic acid in combination with 3-methoxy-4-hydroxycinnamic acid to form organically coated pre-particles. Finally, by melt extrusion with GMA, styrene and PP, the dispersibility and compatibility of the inorganic filler of carbon nanotube / zinc oxide composite in the polypropylene system are increased, thereby significantly improving the bending strength and wear resistance of polypropylene cable material.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A high-toughness composite cable includes a cable body and a sheath layer, wherein the sheath layer is disposed on the cable body, characterized in that the sheath layer comprises the following components by weight:

[0006] 75-85 parts of polypropylene

[0007] 20-23 parts of organic modified filler

[0008] 7-8 parts of auxiliary agent;

[0009] As a preferred embodiment of the present invention, the cable body includes multiple copper conductive cores and a metal shielding layer that wraps around the multiple copper conductive cores.

[0010] As a preferred embodiment of the present invention, the additive is composed of a lubricant, an antioxidant, and an anti-ultraviolet agent mixed in a mass ratio of 5:3.0-3.2:1.8-2.2.

[0011] As a preferred embodiment of the present invention, the lubricant is one or both of oxidized polyethylene wax and lignite wax; the antioxidant is one or more of antioxidant 168, antioxidant 1010 and antioxidant 1076; and the anti-ultraviolet agent is UV-9.

[0012] As a preferred embodiment of the present invention, the method for preparing the organic modified filler includes the following steps:

[0013] Step 1: After mixing carbon nanotubes, chloride salts and deionized water, slowly add sodium hydroxide aqueous solution and stir to mix. After vacuum filtration, wash until neutral, place in an oven to dry and then calcine to obtain composite powder.

[0014] Step 2: After mixing anhydrous ethanol and catalyst, add silane coupling agent and composite powder, stir at a constant temperature, centrifuge, wash, and dry in an oven to obtain pre-made particles;

[0015] Step 3: After mixing the reactant monomer and anhydrous ethanol, add the pre-made particles and initiator and stir to mix. Then, under an inert atmosphere, add mercaptosuccinic acid and treat with ultraviolet irradiation. After centrifugation, washing, and drying in an oven, the modified particles are obtained.

[0016] Step 4: After mixing the modified particles, styrene, crosslinking agent, PP and GMA, the mixture is melt-extruded in an extruder and then pelletized to obtain the organic modified filler.

[0017] As a preferred embodiment of the present invention, in step one, the stirring and mixing is carried out at a speed of 500-600 r / min for 3-4 hours; the cleaning is carried out using deionized water; the drying is carried out at a temperature of 70-80℃ to constant weight; and the calcination is carried out at a temperature of 230℃ for 3-4 hours.

[0018] As a preferred embodiment of the present invention, in step one, the mass ratio of the carbon nanotubes, chloride salt, deionized water and sodium hydroxide aqueous solution is 1.8-2.1:1.0-1.2:18-20:15-16; the chloride salt is composed of zinc chloride and sodium chloride mixed in a mass ratio of 10-11:1; and the mass fraction of the sodium hydroxide aqueous solution is 20%.

[0019] As a preferred embodiment of the present invention, in step two, the mass ratio of the composite powder, silane coupling agent, catalyst, and anhydrous ethanol is 10-14:3-4:0.02-0.03:40-50; the silane coupling agent is triethoxyvinylsilane; and the catalyst is dibutyltin dilaurate.

[0020] As a preferred technical solution of the present invention, in step two, the constant temperature stirring is carried out at a temperature of 50-60℃ for 10-12 hours; the washing is carried out by washing three times with anhydrous ethanol; and the drying is carried out at a temperature of 70-80℃ until constant weight is achieved.

[0021] As a preferred embodiment of the present invention, in step three, the mass ratio of the reactant monomer, pre-prepared particles, mercaptosuccinic acid, anhydrous ethanol, and initiator is 1.0-1.4:12-14:2.6-3.0:50-60:0.10-0.12; the reactant monomer is 3-methoxy-4-hydroxycinnamic acid; the initiator is benzoin dimethyl ether; the stirring and mixing is carried out at a speed of 600-800 r / min for 4-5 h; the ultraviolet irradiation treatment is carried out at a speed of 150-180 r / min and a wavelength of 365 nm for 20-24 h; the inert atmosphere is a nitrogen atmosphere; the cleaning is carried out by cleaning three times with anhydrous ethanol; and the drying is carried out at a temperature of 80°C to constant weight.

[0022] As a preferred embodiment of the present invention, in step four, the mass ratio of the modified particles, styrene, crosslinking agent, PP, and GMA is 14-16:1.6-1.8:0.26-0.30:20-24:3.2-3.8; the melt extrusion is performed at 50 rpm and 190°C for 5 min; the crosslinking agent is dicumyl peroxide; the GMA is glycidyl methacrylate; and the PP is polypropylene.

[0023] This invention discloses a method for preparing a high-toughness composite cable. The preparation method includes the following steps: mixing polypropylene, organic modified filler and additives in a mixer, then melting and extruding the mixture at a temperature of 190-200℃ to obtain a mixture, and then melting and extruding the mixture on the surface of the cable body to obtain the final product.

[0024] The beneficial effects of this invention are:

[0025] This invention improves the dispersibility of carbon nanotubes and zinc oxide by in-situ generation of zinc oxide on them, followed by modification with a silane coupling agent. Then, it grafts the pre-formed particles with mercaptosuccinic acid using 3-methoxy-4-hydroxycinnamic acid to form organically coated pre-formed particles. Finally, it increases the dispersibility and compatibility of the inorganic filler composed of carbon nanotubes / zinc oxide in the polypropylene system by melt extrusion with GMA, styrene, and PP, thereby significantly improving the bending strength and abrasion resistance of polypropylene cable materials. Detailed Implementation

[0026] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below. Example

[0027] A high-toughness composite cable includes a cable body and a sheath layer, wherein the sheath layer is disposed on the cable body, and the sheath layer comprises the following components by weight:

[0028] 75 parts of polypropylene

[0029] 20 parts of organic modified filler

[0030] 7 parts of auxiliary agent;

[0031] The additive is composed of a lubricant, an antioxidant, and a UV stabilizer mixed in a mass ratio of 5:3.0:1.8; the lubricant is oxidized polyethylene wax; the antioxidant is antioxidant 1010; and the UV stabilizer is UV-9.

[0032] The preparation method of the organic modified filler includes the following steps:

[0033] Step 1: After mixing carbon nanotubes, chloride salt, and deionized water, slowly add sodium hydroxide aqueous solution and stir at 500 r / min for 3 h. After vacuum filtration, wash with deionized water until neutral, place in an oven, dry at 70℃ to constant weight, and then calcine at 230℃ for 3 h to obtain composite powder; the mass ratio of carbon nanotubes, chloride salt, deionized water, and sodium hydroxide aqueous solution is 1.8:1.0:18:15; the chloride salt is composed of zinc chloride and sodium chloride mixed at a mass ratio of 10:1; the mass fraction of the sodium hydroxide aqueous solution is 20%.

[0034] Step 2: After mixing anhydrous ethanol and the catalyst, add the silane coupling agent and composite powder. Stir at 50°C for 10 hours, centrifuge to collect the solid, wash three times with anhydrous ethanol, place in an oven, and dry at 70°C to constant weight to obtain pre-formed particles; the mass ratio of the composite powder, silane coupling agent, catalyst, and anhydrous ethanol is 10:3:0.02:40; the silane coupling agent is triethoxyvinylsilane; the catalyst is dibutyltin dilaurate.

[0035] Step 3: After mixing the reactant monomer and anhydrous ethanol, add the pre-prepared particles and initiator, stir at 600 r / min for 4 h, then add mercaptosuccinic acid under a nitrogen atmosphere and irradiate with ultraviolet light at 150 r / min and 365 nm wavelength for 20 h. Centrifuge to collect the solid, wash three times with anhydrous ethanol, place in an oven, and dry at 80℃ to constant weight to obtain modified particles; the mass ratio of reactant monomer, pre-prepared particles, mercaptosuccinic acid, anhydrous ethanol and initiator is 1.0:12:2.6:50:0.10; the reactant monomer is 3-methoxy-4-hydroxycinnamic acid; the initiator is benzoin dimethyl ether;

[0036] Step 4: After mixing the modified granules, styrene, crosslinking agent, PP and GMA, place them in an extruder and melt-extrude at 190°C and 50 rpm for 5 min. Then, granulate to obtain the organic modified filler. The mass ratio of the modified granules, styrene, crosslinking agent, PP and GMA is 14:1.6:0.26:20:3.2. The crosslinking agent is dicumyl peroxide.

[0037] A method for preparing a high-toughness composite cable includes the following steps: polypropylene, organic modified filler and additives are mixed in an internal mixer, and then melt-extruded at 190°C to obtain a mixture. The mixture is then melt-extruded onto the surface of the cable body to obtain the final product. Example

[0038] A high-toughness composite cable includes a cable body and a sheath layer, wherein the sheath layer is disposed on the cable body, and the sheath layer comprises the following components by weight:

[0039] 80 parts of polypropylene

[0040] 22 parts of organic modified filler

[0041] 7.5 parts of auxiliary agent;

[0042] The additive is a mixture of lubricant, antioxidant and UV stabilizer in a mass ratio of 5:3.1:2; the lubricant is oxidized polyethylene wax; the antioxidant is antioxidant 1010; and the UV stabilizer is UV-9.

[0043] The preparation method of the organic modified filler includes the following steps:

[0044] Step 1: After mixing carbon nanotubes, chloride salt, and deionized water, slowly add sodium hydroxide aqueous solution and stir at 550 r / min for 3.5 h. After vacuum filtration, wash with deionized water until neutral, place in an oven, dry at 75℃ to constant weight, and then calcine at 230℃ for 3.5 h to obtain composite powder. The mass ratio of carbon nanotubes, chloride salt, deionized water, and sodium hydroxide aqueous solution is 2:1.1:19:15.5; the chloride salt is composed of zinc chloride and sodium chloride mixed at a mass ratio of 10.5:1; the mass fraction of the sodium hydroxide aqueous solution is 20%.

[0045] Step 2: After mixing anhydrous ethanol and the catalyst, add the silane coupling agent and composite powder. Stir at 55°C for 11 hours, centrifuge to collect the solid, wash three times with anhydrous ethanol, place in an oven, and dry at 75°C to constant weight to obtain pre-formed particles; the mass ratio of the composite powder, silane coupling agent, catalyst, and anhydrous ethanol is 12:3.5:0.025:45; the silane coupling agent is triethoxyvinylsilane; the catalyst is dibutyltin dilaurate.

[0046] Step 3: After mixing the reactant monomer and anhydrous ethanol, add the pre-prepared particles and initiator, stir at 700 r / min for 4.5 h, then add mercaptosuccinic acid under a nitrogen atmosphere and irradiate with ultraviolet light at 165 r / min and 365 nm wavelength for 22 h. Centrifuge to collect the solid, wash three times with anhydrous ethanol, place in an oven, and dry at 80℃ to constant weight to obtain modified particles; the mass ratio of reactant monomer, pre-prepared particles, mercaptosuccinic acid, anhydrous ethanol and initiator is 1.2:13:2.8:55:0.11; the reactant monomer is 3-methoxy-4-hydroxycinnamic acid; the initiator is benzoin dimethyl ether;

[0047] Step 4: After mixing the modified granules, styrene, crosslinking agent, PP and GMA, place them in an extruder and melt-extrude at 50 rpm and 190°C for 5 min. Then, granulate to obtain the organic modified filler. The mass ratio of the modified granules, styrene, crosslinking agent, PP and GMA is 15:1.7:0.28:22:3.5. The crosslinking agent is dicumyl peroxide.

[0048] A method for preparing a high-toughness composite cable includes the following steps: polypropylene, organic modified filler and additives are mixed in an internal mixer, and then melt-extruded at 195°C to obtain a mixture. The mixture is then melt-extruded onto the surface of the cable body to obtain the final product. Example

[0049] A high-toughness composite cable includes a cable body and a sheath layer, wherein the sheath layer is disposed on the cable body, and the sheath layer comprises the following components by weight:

[0050] 85 parts of polypropylene

[0051] 23 parts of organic modified filler

[0052] 8 parts of auxiliary agent;

[0053] The additive is a mixture of lubricant, antioxidant and UV stabilizer in a mass ratio of 5:3.2:2.2; the lubricant is oxidized polyethylene wax; the antioxidant is antioxidant 1010; and the UV stabilizer is UV-9.

[0054] The preparation method of the organic modified filler includes the following steps:

[0055] Step 1: After mixing carbon nanotubes, chloride salt, and deionized water, slowly add sodium hydroxide aqueous solution and stir at 600 r / min for 4 hours. After vacuum filtration, wash with deionized water until neutral, place in an oven, dry at 80℃ to constant weight, and then calcine at 230℃ for 4 hours to obtain composite powder. The mass ratio of carbon nanotubes, chloride salt, deionized water, and sodium hydroxide aqueous solution is 2.1:1.2:20:16; the chloride salt is composed of zinc chloride and sodium chloride mixed at a mass ratio of 11:1; the mass fraction of the sodium hydroxide aqueous solution is 20%.

[0056] Step 2: After mixing anhydrous ethanol and the catalyst, add the silane coupling agent and composite powder. Stir at 60°C for 12 hours, centrifuge to collect the solid, wash three times with anhydrous ethanol, place in an oven, and dry at 80°C to constant weight to obtain pre-formed particles; the mass ratio of the composite powder, silane coupling agent, catalyst, and anhydrous ethanol is 14:4:0.03:50; the silane coupling agent is triethoxyvinylsilane; the catalyst is dibutyltin dilaurate.

[0057] Step 3: After mixing the reactant monomer and anhydrous ethanol, add the pre-prepared particles and initiator, stir at 800 rpm for 5 hours, then add mercaptosuccinic acid under a nitrogen atmosphere and irradiate with ultraviolet light at 180 rpm and 365 nm wavelength for 24 hours. Centrifuge to collect the solid, wash three times with anhydrous ethanol, place in an oven, and dry at 80℃ to constant weight to obtain modified particles; the mass ratio of reactant monomer, pre-prepared particles, mercaptosuccinic acid, anhydrous ethanol, and initiator is 1.4:14:3.0:60:0.12; the reactant monomer is 3-methoxy-4-hydroxycinnamic acid; the initiator is benzoin dimethyl ether.

[0058] Step 4: After mixing the modified granules, styrene, crosslinking agent, PP and GMA, place them in an extruder and melt-extrude at 190°C and 50 rpm for 5 min. Then, granulate to obtain the organic modified filler. The mass ratio of the modified granules, styrene, crosslinking agent, PP and GMA is 16:1.8:0.30:24:3.8. The crosslinking agent is dicumyl peroxide.

[0059] A method for preparing a high-toughness composite cable includes the following steps: polypropylene, organic modified filler and additives are mixed in a mixer, and then melt-extruded at 200°C to obtain a mixture. The mixture is then melt-extruded onto the surface of the cable body to obtain the final product.

[0060] Comparative Example 1

[0061] Compared with Example 3, Comparative Example 1 differs in that zinc chloride is not added in step one, while the remaining components, preparation steps and parameters are the same.

[0062] Comparative Example 2

[0063] Compared with Example 3, Comparative Example 2 differs in that step two does not use a silane coupling agent, while the remaining components, preparation steps and parameters are the same.

[0064] Comparative Example 3

[0065] Compared with Example 3, Comparative Example 3 differs in that 3-methoxy-4-hydroxycinnamic acid is not used in step three, while the other components, preparation steps and parameters are the same.

[0066] Comparative Example 4

[0067] Compared with Example 3, Comparative Example 4 differs in that mercaptosuccinic acid is not used in step three, while the other components, preparation steps and parameters are the same.

[0068] Comparative Example 5

[0069] Compared with Example 3, Comparative Example 5 differs in that styrene is not used in step four, while the other components, preparation steps and parameters are the same.

[0070] Comparative Example 6

[0071] Compared with Example 3, Comparative Example 6 differs in that GMA is not used in step four, while the other components, preparation steps and parameters are the same.

[0072] The mixtures prepared in Examples 1-3 and Comparative Examples 1-6 were tested as follows, and the test results are shown in Table 1.

[0073] Bending strength test: according to GB / T 9341-2008;

[0074] Abrasion resistance test: according to GB / T 3960-2016;

[0075] Table 1

[0076] Bending strength (MPa) Wear amount (mg) Example 1 62.6 17.6 Example 2 62.9 17.1 Example 3 63.1 16.4 Comparative Example 1 42.3 33.1 Comparative Example 2 50.6 23.7 Comparative Example 3 48.1 27.3 Comparative Example 4 48.8 27.9 Comparative Example 5 52.3 21.1 Comparative Example 6 46.3 29.7

[0077] As can be seen from the test results in Table 1, compared with Comparative Examples 1-6, the cable material prepared by the present invention has significantly improved bending strength and wear resistance, and possesses excellent high toughness and wear resistance.

[0078] This invention generates zinc oxide in situ on carbon nanotubes, reducing intermolecular forces and improving its dispersibility, thus facilitating subsequent organic modification. Modification is then performed using a silane coupling agent to introduce active thiol groups. Subsequently, through hydrogen bonding and electrostatic adsorption between the carboxyl and hydroxyl groups on 3-methoxy-4-hydroxycinnamic acid and the pre-formed particles, the cinnamic acid adheres to the pre-formed particles. The thiol groups on the pre-formed particles then combine with mercaptosuccinic acid to form grafted pre-formed organically coated particles. The resulting modified particles are then further modified by bonding with the grafted pre-formed particles. GMA grafted onto PP segments reacts and becomes fixed to the PP segments. The multi-carboxyl structure of the modified particles allows GMA to react with the remaining carboxyl and phenolic hydroxyl groups on the modified particles, thus indirectly grafting it onto the PP segments. The conjugated structure of styrene and cinnamic acid groups inhibits PP degradation during the grafting process, thereby improving the apparent grafting rate of GMA. GMA / PP can also act as a compatibilizer for inorganic fillers, increasing its dispersibility and compatibility in the overall polypropylene system, thereby significantly improving the bending strength and abrasion resistance of polypropylene cable materials.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high tenacity composite cable comprising a cable body and a jacket layer, said jacket layer being provided on said cable body, characterized in that, The sheath layer comprises the following components by weight fraction: Polypropylene 75-85 parts Organic modified filler 20-23 parts Auxiliary agent 7-8 parts The preparation method of the organic modified filler comprises the following steps: Step one: mix carbon nanotubes, chlorinated salt and deionized water, slowly add sodium hydroxide solution, stir and mix, vacuum filter, wash to neutral, dry in an oven, calcine, and obtain a composite powder; Step two: mix anhydrous ethanol and a catalyst, add silane coupling agent and the composite powder, constant temperature stirring, centrifugal, washing, dry in an oven, and obtain pre-made particles; the silane coupling agent is triethoxyvinylsilane; the mass ratio of the composite powder, silane coupling agent, catalyst and anhydrous ethanol is 10-14:3-4:0.02-0.03:40-50; the catalyst is dibutyltin dilaurate; Step three: mix reaction monomer and anhydrous ethanol, add pre-made particles and initiator, stir and mix, under inert atmosphere, add mercapto succinic acid, ultraviolet irradiation treatment, centrifugal, washing, dry in an oven, and obtain modified particles; the mass ratio of the reaction monomer, pre-made particles, mercapto succinic acid, anhydrous ethanol and initiator is 1.0-1.4:12-14:2.6-3.0:50-60:0.10-0.12; the reaction monomer is 3-methoxy-4-hydroxycinnamic acid; Step four: compound modified particles, styrene, crosslinking agent, PP and GMA, melt extrusion in an extruder, and obtain organic modified filler; the mass ratio of the modified particles, styrene, crosslinking agent, PP and GMA is 14-16:1.6-1.8:0.26-0.30:20-24:3.2-3.8; the crosslinking agent is dicumyl peroxide.

2. A high tenacity composite cable according to claim 1, characterized in that: The auxiliary agent is mixed by lubricant, antioxidant and anti-ultraviolet agent in a mass ratio of 5:3.0-3.2:1.8-2.

2.

3. A high tenacity composite cable according to claim 2, wherein: The lubricant is one or both of oxidized polyethylene wax and lignite wax; the antioxidant is one or more of antioxidant 168, antioxidant 1010 and antioxidant 1076; the anti-ultraviolet agent is UV-9.

4. A high tenacity composite cable according to claim 1, characterized in that: In step one, the stirring and mixing is stirring at a speed of 500-600 r / min for 3-4 h; the washing is washing with deionized water; the drying is drying at a temperature of 70-80℃ until constant weight; the calcining is calcining at a temperature of 230℃ for 3-4 h.

5. A high tenacity composite cable according to claim 1, wherein: In step one, the mass ratio of the carbon nanotubes, chlorinated salt, deionized water and sodium hydroxide solution is 1.8-2.1:1.0-1.2:18-20:15-16; the chlorinated salt is mixed by zinc chloride and sodium chloride in a mass ratio of 10-11:1; the mass fraction of the sodium hydroxide solution is 20%.

6. A high tenacity composite cable according to claim 1, wherein: In step two, the constant temperature stirring is stirring at a temperature of 50-60℃ for 10-12 h; the washing is washing with anhydrous ethanol three times; the drying is drying at a temperature of 70-80℃ until constant weight. In step two, the constant temperature stirring is stirring at a temperature of 50-60℃ for 10-12 h; the washing is washing with anhydrous ethanol three times; the drying is drying at a temperature of 70-80℃ until constant weight.

7. A high tenacity composite cable according to claim 1, wherein: In step three, the initiator is benzoquinone; the stirring mixing is stirring at a speed of 600-800 r / min for 4-5 h; the ultraviolet irradiation treatment is ultraviolet irradiation at a wavelength of 365 nm for 20-24 h at a speed of 150-180 r / min; the inert atmosphere is a nitrogen atmosphere; the cleaning is cleaning with anhydrous ethanol for three times; and the drying is drying at a temperature of 80 ℃ until the weight is constant.

8. A high tenacity composite cable according to claim 1, wherein: In step four, the melt extrusion is melt extrusion at a temperature of 190 ℃ for 5 min at a speed of 50 rpm.

9. A process for the production of a high flexibility composite cable according to any one of claims 1 to 8, characterized in that, The preparation method comprises the following steps: placing polypropylene, an organic modified filler and an auxiliary agent into a mixing mill, melt extruding at a temperature of 190-200 ℃ to obtain a mixture, and melt extruding the mixture on the surface of a cable body to obtain the product.