Rat-proof and ant-proof flame-retardant medium-voltage cable and preparation method thereof

Abstract

The invention discloses a rat-proof and termite-proof flame-retardant medium-voltage cable and a preparation method thereof, and belongs to the technical field of cables. The cable is composed of a conductor, a conductor shielding layer, an insulating layer, a metal shielding layer and a protective sleeve which are sequentially arranged from inside to outside. Linear low-density polyethylene is taken as a raw material of the protective sleeve material, and polyethylene molecular chains are mutually connected through irradiation crosslinking to form a three-dimensional network structure, so that the cable is endowed with excellent mechanical strength and excellent comprehensive performance; by modifying the nano silicon nitride, the agglomeration phenomenon is obviously reduced, the mechanical strength and wear resistance of the cable are enhanced, and the rat-proof and termite-proof effects of the cable are improved; the prepared multi-effect flame retardant contains multiple functional groups, can significantly enhance the flame retardance, mechanical strength and rat-proof and termite-proof effects of the cable, and has long and stable performance. Therefore, the prepared cable is high in mechanical strength and good in wear resistance, has stable and efficient flame retardance and rat-proof and termite-proof effects, and has important application value in the technical field of cables.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a rat-ant-proof flame-retardant medium-voltage cable and a preparation method thereof. Background Art

[0002] Medium voltage cables are cables used in power systems, usually cables with voltage levels between several kilovolts and 33 kilovolts. These cables are critical in power systems, as they are responsible for transmitting electrical energy from power stations or substations to various power consumption areas. Therefore, they are widely used in power transmission and distribution in urban power grids, industrial areas, commercial areas, and residential areas. They can be laid underground or overhead, depending on the laying method and environmental conditions.

[0003] There are many choices of materials for medium voltage cables, including but not limited to polyethylene (PE), polypropylene (PP), cross-linked polyethylene (XLPE), polyvinyl chloride (PVC) and rubber. Among them, cross-linked polyethylene is a thermosetting material that forms a three-dimensional network structure between polyethylene molecular chains through chemical or physical methods. It can greatly improve the high temperature resistance and mechanical properties of the material, but cross-linked polyethylene has a low oxygen index and poor flame retardant properties. If a fire occurs in an overhead cable, it is difficult to extinguish due to its high altitude, and the spread of the fire along the cable line increases the hazard of the fire.

[0004] According to statistics, 1 / 4 of the fires of unknown causes in cities are caused by rats and ants biting cables. It can be seen that harmful organisms such as rats and termites pose a great hidden danger to the safe operation of electrical facilities such as wires and cables. Therefore, based on the above problems, it is urgent to invent a cable with anti-rat and ant and flame retardant functions to meet the higher demands in the field of cable technology. Summary of the invention

[0005] The object of the present invention is to overcome the defects of the prior art and provide a rat-ant-proof flame-retardant medium-voltage cable and a preparation method thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A rat-proof and ant-proof flame-retardant medium-voltage cable is composed of a conductor, a conductor shielding layer, an insulating layer, a metal shielding layer and a protective sheath which are arranged in sequence from the inside to the outside.

[0008] A method for preparing a rat- and ant-proof flame-retardant medium-voltage cable comprises the following steps:

[0009] The conductor shielding layer and the insulating layer are sequentially extruded on the conductor, the surface of the insulating layer is covered with a metal shielding layer, and then the protective sheath material is extruded and covered on the surface of the metal shielding layer, and cross-linked to obtain a rat-ant-proof flame-retardant medium-voltage cable.

[0010] Furthermore, the material of the conductor shielding layer is a semi-conductive material.

[0011] Furthermore, the material of the insulating layer is polypropylene.

[0012] Furthermore, the conductor is made of pure copper.

[0013] Furthermore, the metal shielding layer is woven from copper wires.

[0014] Furthermore, the material of the protective cover includes the following raw materials in parts by weight: 100-120 parts of high-density polyethylene, 10-16 parts of modified nano silicon nitride, 5-15 parts of multi-effect flame retardant, 4-6 parts of lubricant, 2-4 parts of antioxidant, and 5-7 parts of cross-linking sensitizer.

[0015] Furthermore, the lubricant is one of epoxidized soybean oil and paraffin.

[0016] Furthermore, the antioxidant is a hindered phenol antioxidant.

[0017] Furthermore, the cross-linking sensitizer is one of triallyl cyanurate, triallyl isocyanurate and trimethylolpropane trimethacrylate.

[0018] Using high-density polyethylene as the main matrix, the prepared protective cover material has higher mechanical strength.

[0019] Furthermore, the modified nano silicon nitride is prepared by the following steps:

[0020] Add nano silicon nitride and toluene into a three-necked flask, stir magnetically for 1 hour to evenly disperse the nano silicon nitride, then add vinyltrimethoxysilane, stir and react at 60°C for 6 hours. After the reaction is complete, filter out the residue, dry in an oven for 12 hours, and grind to obtain modified nano silicon nitride.

[0021] Furthermore, the usage ratio of nano silicon nitride, toluene and vinyltrimethoxysilane is 2g:100mL:5g.

[0022] Nano silicon nitride is a ceramic powder with excellent performance, high strength and good wear resistance. By modifying nano silicon nitride, the surface hydrophobicity is enhanced, making it more compatible with the polyethylene matrix, promoting the uniform dispersion of nano silicon nitride in the matrix, reducing the occurrence of nano silicon nitride agglomeration, greatly enhancing the mechanical strength and wear resistance of the matrix, making the protective cover resistant to the bites of rats and termites, and improving the anti-rat and anti-ant effect of the matrix.

[0023] Furthermore, the multi-effect flame retardant is prepared by the following steps:

[0024] S1. In a three-necked flask equipped with a stirring device, melamine, geranyl aldehyde, piperidine (condensing agent) and pyridine were stirred and mixed uniformly, the reaction temperature was controlled to 60° C., and the reaction was kept warm for 8 hours. After the reaction was completed, it was naturally cooled, filtered, and the filter cake was taken. It was washed with anhydrous ethanol for 2-3 times and dried in vacuo to obtain intermediate 1; the ratio of melamine, geranyl aldehyde, piperidine and pyridine was 13.7 g:30.4 g:15 mL:100 mL;

[0025] Under the action of the condensing agent, the amino groups on melamine condense with the aldehyde groups on terephthalaldehyde to form imine groups (C=N Schiff base structure), and by controlling the molar ratio of the two to be close to 1:2 and a slight excess of melamine, only two amino groups on melamine participate in the reaction to obtain intermediate 1; the specific reaction process is as follows:

[0026]

[0027] S2, add 9-decenol and toluene to a three-necked flask equipped with a stirring device, stir and mix well, then add phenylphosphonyl dichloride and triethylamine, stir again, raise the temperature to 70 ° C, stir and react for 8 hours, the reaction is completed, filter to remove triethylamine hydrochloride, distill under reduced pressure to remove part of the solvent, and then purify by column chromatography (eluent using a mixed solvent of chloroform / benzene in a volume ratio of 5:3), and remove the eluent by rotary evaporation to obtain intermediate 2; the ratio of 9-decenol, toluene, phenylphosphonyl dichloride and triethylamine is 15.6 g:100 mL:20.7 g:15 mL;

[0028] Phenylphosphonyl chloride and 9-decenol undergo a nucleophilic substitution reaction. By controlling the molar ratio of the two to be close to 1:1 and the amount of phenylphosphonyl chloride to be slightly excessive, only one -Cl on the phenylphosphonyl chloride participates in the reaction. Triethylamine removes the hydrogen chloride generated by the reaction to obtain intermediate 2. The specific reaction process is shown below:

[0029]

[0030] S3. At room temperature, in a three-necked flask equipped with a stirring device, intermediate 1, intermediate 2, N,N-dimethylformamide (DMF) and potassium carbonate were mixed and stirred evenly under nitrogen protection, the reaction temperature was controlled to 70°C, and the reaction was kept warm for 7 hours. After the reaction was completed, the mixture was filtered, and some solvents were removed by vacuum distillation. The mixture was purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate in a volume ratio of 1:4), the eluent was removed by rotary evaporation, and the mixture was dried in vacuo to obtain a multi-effect flame retardant. The ratio of the amount of intermediate 1, intermediate 2, N,N-dimethylformamide and potassium carbonate was 39.4 g:31.4 g:150 mL:13.8 g.

[0031] Potassium carbonate is used as an acid-binding agent to accelerate the reaction, and intermediate 1 and intermediate 2 undergo a nucleophilic substitution reaction to obtain a multi-effect flame retardant. The specific reaction process is as follows:

[0032]

[0033] The prepared multi-effect flame retardant molecule contains PN flame retardant components, Schiff base, triazine, long carbon chain and carbon-carbon double bond; among them, the PN flame retardant component has the synergistic flame retardant effect of phosphorus and nitrogen flame retardants, and can give the matrix safe and efficient flame retardant performance; in addition, the C=N double bond in the Schiff base structure can generate a carbon-nitrogen six-membered ring at high temperature, and this kind of six-membered ring structure enables the matrix to form a stable cross-linked network, effectively improving the flame retardant performance of the matrix; not only that, the introduced triazine structure will produce nitrogen-containing gas during combustion, dilute and reduce the smoke density, and self-condense at high temperature to form melem to make the carbon layer tight, further improving the flame retardant performance of the matrix; in addition, the introduced long carbon chain is a methylene chain segment, which is a flexible chain segment and can be interspersed in the cross-linked structure of the matrix, which not only improves the mechanical properties of the matrix, but also improves the stability of the performance; finally, one end of the multi-effect flame retardant contains a carbon-carbon double bond, which can be cross-linked with the matrix during irradiation, improve the interaction force with the matrix, and ensure the long-term stability of the performance of the additive.

[0034] It should be noted that multi-effect flame retardants contain terpenoid components. Terpenoid compounds can be used as terpenoid repellents because of their low toxicity, low irritation and aromatic properties. They have a strong repellent effect on rats and ants.

[0035] Beneficial effects of the present invention:

[0036] 1. The protective sheath material is made of linear low-density polyethylene. Through radiation cross-linking, the polyethylene molecular chains are linked to each other to form a three-dimensional network structure, which gives the cable excellent mechanical strength and outstanding comprehensive performance;

[0037] 2. By modifying nano silicon nitride, compared with ordinary nano silicon nitride, it has better compatibility with polyethylene, significantly reduces the agglomeration phenomenon, greatly enhances the mechanical strength and wear resistance of the cable, and thus improves the anti-rat and anti-ant effect of the cable;

[0038] 3. The prepared multi-effect flame retardant contains a variety of functional groups, which can significantly enhance the flame retardancy, mechanical strength and anti-rat and anti-ant effects of the cable, and the performance is long-lasting and stable.

[0039] Therefore, the cable produced by the present invention has high mechanical strength, good wear resistance, stable and efficient flame retardancy and anti-rat and anti-ant effects, and has important application value in the field of cable technology. 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] Preparation of multi-effect flame retardant:

[0043] S1. In a three-necked flask equipped with a stirring device, 13.7 g of melamine, 30.4 g of geranyl aldehyde, 15 mL of piperidine and 100 mL of pyridine were stirred and mixed uniformly, the reaction temperature was controlled to 60° C., and the reaction was kept warm for 8 hours. After the reaction was completed, it was naturally cooled, filtered, and the filter cake was taken, washed twice with anhydrous ethanol, and vacuum dried to obtain intermediate 1;

[0044] S2, in a three-necked flask equipped with a stirring device, 15.6g 9-decenol and 100mL toluene were added and stirred and mixed well, then 20.7g phenylphosphonyl dichloride and 15mL triethylamine were added, and stirred again, the temperature was raised to 70°C, and the reaction was stirred for 8h. After the reaction was completed, triethylamine hydrochloride was filtered out, and part of the solvent was removed by distillation under reduced pressure, and then purified by column chromatography (the eluent was a mixed solvent of chloroform / benzene, and the volume ratio of the two was 5:3), and the eluent was removed by rotary evaporation to obtain intermediate 2;

[0045] S3. At room temperature, under nitrogen protection, 39.4 g of intermediate 1, 31.4 g of intermediate 2, 150 mL of N,N-dimethylformamide and 13.8 g of potassium carbonate were mixed and stirred evenly in a three-necked flask equipped with a stirring device. The reaction temperature was controlled to 70°C and the reaction was kept warm for 7 hours. After the reaction was completed, it was filtered and part of the solvent was removed by distillation under reduced pressure. Then it was purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate in a volume ratio of 1:4), the eluent was removed by rotary evaporation, and vacuum drying was performed to obtain a multi-effect flame retardant.

[0046] Example 2

[0047] Preparation of multi-effect flame retardant:

[0048] S1. In a three-necked flask equipped with a stirring device, 27.4 g of melamine, 60.8 g of geranyl aldehyde, 30 mL of piperidine and 200 mL of pyridine were stirred and mixed uniformly, the reaction temperature was controlled to 60° C., and the reaction was kept warm for 8 hours. After the reaction was completed, it was naturally cooled, filtered, and the filter cake was taken, washed twice with anhydrous ethanol, and vacuum dried to obtain intermediate 1;

[0049] S2, in a three-necked flask equipped with a stirring device, 31.2g 9-decenol and 200mL toluene were added and stirred and mixed well, then 41.4g phenylphosphonyl dichloride and 30mL triethylamine were added, and stirred again, the temperature was raised to 70°C, and the reaction was stirred for 8h. After the reaction was completed, triethylamine hydrochloride was filtered out, and part of the solvent was removed by distillation under reduced pressure, and then purified by column chromatography (the eluent was a mixed solvent of chloroform / benzene, and the volume ratio of the two was 5:3), and the eluent was removed by rotary evaporation to obtain intermediate 2;

[0050] S3. At room temperature and under nitrogen protection, 78.8 g of intermediate 1, 62.8 g of intermediate 2, 300 mL of N,N-dimethylformamide and 27.6 g of potassium carbonate were mixed and stirred evenly in a three-necked flask equipped with a stirring device. The reaction temperature was controlled to 70°C and the reaction was kept warm for 7 hours. After the reaction was completed, the product was filtered and part of the solvent was removed by distillation under reduced pressure. The product was then purified by column chromatography (the eluent was a mixed solvent of benzene / ethyl acetate in a volume ratio of 1:4), the eluent was removed by rotary evaporation, and the product was dried in vacuo to obtain a multi-effect flame retardant.

[0051] Example 3

[0052] Preparation of modified nano silicon nitride:

[0053] Add 2 g of nano-silicon nitride and 100 mL of toluene into a three-necked flask, stir magnetically for 1 h to evenly disperse the nano-silicon nitride, then add 5 g of vinyltrimethoxysilane and stir the mixture at 60 °C for 6 h. After the reaction is complete, filter out the residue, dry it in an oven for 12 h, and grind it to obtain modified nano-silicon nitride.

[0054] Example 4

[0055] Preparation of modified nano silicon nitride:

[0056] Add 4 g of nano-silicon nitride and 200 mL of toluene into a three-necked flask, stir magnetically for 1 h to evenly disperse the nano-silicon nitride, then add 10 g of vinyltrimethoxysilane and stir at 60 °C for 6 h. After the reaction is complete, filter out the residue, dry it in an oven for 12 h, and grind it to obtain modified nano-silicon nitride.

[0057] Example 5

[0058] Preparation of protective cover materials:

[0059] 100 g of high-density polyethylene, 10 g of modified nano silicon nitride prepared in Example 3, 5 g of the multi-effect flame retardant prepared in Example 1, 4 g of epoxy soybean oil, 2 g of antioxidant 1010 and 5 g of triallyl cyanurate were put into a twin-screw extruder, melt-blended, and irradiated with an electron accelerator after extrusion to obtain a protective cover material;

[0060] The irradiation was performed using a domestically produced GJ-1.5 high-frequency and high-voltage electron accelerator with an energy of 1.5 MeV and a current of 25 mA; the irradiation dose rate was 3 kGy / time, and the total irradiation dose was 120 kGy.

[0061] Example 6

[0062] Preparation of protective cover materials:

[0063] 110 g of high-density polyethylene, 13 g of modified nano silicon nitride prepared in Example 4, 10 g of the multi-effect flame retardant prepared in Example 2, 5 g of paraffin, 3 g of antioxidant 1010 and 6 g of trimethylolpropane trimethacrylate were put into a twin-screw extruder, melt-blended, and irradiated with an electron accelerator after extrusion to obtain a protective cover material;

[0064] The irradiation was performed using a domestically produced GJ-1.5 high-frequency and high-voltage electron accelerator with an energy of 1.5 MeV and a current of 25 mA; the irradiation dose rate was 3 kGy / time, and the total irradiation dose was 120 kGy.

[0065] Example 7

[0066] Preparation of protective cover materials:

[0067] 120g of high-density polyethylene, 16g of modified nano silicon nitride prepared in Example 4, 15g of the multi-effect flame retardant prepared in Example 2, 6g of paraffin wax, 4g of antioxidant 1010 and 7g of trimethylolpropane trimethacrylate were put into a twin-screw extruder, melt-blended, and irradiated with an electron accelerator after extrusion to obtain a protective cover material;

[0068] The irradiation was performed using a domestically produced GJ-1.5 high-frequency and high-voltage electron accelerator with an energy of 1.5 MeV and a current of 25 mA; the irradiation dose rate was 3 kGy / time, and the total irradiation dose was 120 kGy.

[0069] Example 8

[0070] A semiconductive material (forming a conductor shielding layer) and polypropylene (forming an insulating layer) are sequentially extruded on a pure copper conductor, and a metal shielding layer woven with copper wire is coated on the surface of the insulating layer; 120 g of high-density polyethylene, 16 g of modified nano silicon nitride prepared in Example 4, 15 g of the multi-effect flame retardant prepared in Example 2, 6 g of paraffin, 4 g of antioxidant 1010 and 7 g of trimethylolpropane trimethacrylate are put into a twin-screw extruder, melt-blended, coated on the surface of the metal shielding layer through the extruder, and irradiated with an electron accelerator to obtain a rat-ant-proof flame-retardant medium-voltage cable;

[0071] The irradiation was performed using a domestically produced GJ-1.5 high-frequency and high-voltage electron accelerator with an energy of 1.5 MeV and a current of 25 mA; the irradiation dose rate was 3 kGy / time, and the total irradiation dose was 120 kGy.

[0072] Comparative Example 1

[0073] The same mass of commercially available phosphorus-based flame retardant was used to replace the multi-effect flame retardant in Example 7, and the remaining steps were the same as in Example 7 to prepare the protective cover material.

[0074] Comparative Example 2

[0075] Use commercially available flame retardant cross-linked polyethylene cable material.

[0076] Comparative Example 3

[0077] Use commercially available rat and ant-proof cables.

[0078] The protective cover materials of Examples 5-7 and Comparative Examples 1-2 were made into corresponding shapes to be tested according to different test standards, and the following performance tests were performed:

[0079] The national standard GB / T 2406-2008 "Test method for combustion performance of plastics" is used to measure the limiting oxygen index of the sample before and after being placed at room temperature for 180 days;

[0080] The tensile properties are determined using the national standard GB / T 1040.2-2006 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics";

[0081] The volume wear is measured using the national standard GB / T 3960-2016 "Test methods for sliding friction and wear of plastics";

[0082] The hardness is measured using the national standard GB / T 2411-2008 "Determination of indentation hardness (Shore hardness) of plastics and hard rubber using a hardness tester";

[0083] The measured results are shown in Table 1:

[0084] Table 1

[0085]

[0086] After the cables of Example 8 and Comparative Example 3 were naturally placed at room temperature for 300 days, the termite infestation degree and rat protection level were measured using the standards JB / T 10696.9-2011 "Methods for testing mechanical and physical and chemical properties of wires and cables Part 9: Termite test" and JB / T 10696.10-2011 "Methods for testing mechanical and physical and chemical properties of wires and cables Part 10: Rat gnawing test";

[0087] The measured results are shown in Table 2:

[0088] Example 8 Comparative Example 3 Termite infestation level Level 1 Level 2 Rat protection level Significant better

[0089] It can be seen from the above two tables that the mechanical strength, wear resistance and flame retardancy of the cable prepared in the embodiment of the present invention are higher than those of the control example, and the flame retardancy and anti-rat and ant effects are stable. Therefore, the present invention has important application value in the field of cable technology.

[0090] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0091] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A rat-proof and ant-proof flame-retardant medium-voltage cable, comprising a conductor, a conductor shielding layer, an insulating layer, a metal shielding layer and a protective sheath arranged in sequence from the inside to the outside, characterized in that: The material of the protective cover includes the following raw materials in parts by weight: 100-120 parts of high-density polyethylene, 10-16 parts of modified nano silicon nitride, 5-15 parts of multi-effect flame retardant, 4-6 parts of lubricant, 2-4 parts of antioxidant, and 5-7 parts of cross-linking sensitizer; Wherein, the multi-effect flame retardant is prepared by the following steps: S1, stirring and mixing melamine, geranyl aldehyde, piperidine and pyridine, and keeping the mixture at 60°C for 8 hours. After the reaction is completed, the mixture is cooled naturally, filtered, and the filter cake is taken, washed, and dried to obtain intermediate 1; S2, after 9-decenol and toluene are fully stirred and mixed, phenylphosphonic acid dichloride and triethylamine are added, and the mixture is stirred again and reacted at 70° C. for 8 h. After the reaction is completed, the mixture is filtered, distilled under reduced pressure, purified by column chromatography, and rotary evaporated to obtain intermediate 2; S3. At room temperature, under nitrogen protection, mix and stir intermediate 1, intermediate 2, N,N-dimethylformamide and potassium carbonate evenly, react at 70°C for 7 hours. After the reaction is completed, filter, distill under reduced pressure, purify by column chromatography, rotary evaporate, and dry to obtain a multi-effect flame retardant.

2. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: In step S1, the ratio of melamine, geranyl aldehyde, piperidine and pyridine is 13.7 g: 30.4 g: 15 mL: 100 mL.

3. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: In step S2, the ratio of 9-decenol, toluene, phenylphosphonic acid dichloride and triethylamine is 15.6 g:100 mL:20.7 g:15 mL.

4. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: In step S3, the ratio of the amount of intermediate 1, intermediate 2, N,N-dimethylformamide and potassium carbonate is 39.4 g:31.4 g:150 mL:13.8 g.

5. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: The modified nano silicon nitride is prepared by the following steps: Add nano silicon nitride and toluene into a three-necked flask, stir magnetically for 1 hour to evenly disperse the nano silicon nitride, then add vinyltrimethoxysilane, stir and react at 60°C for 6 hours. After the reaction is complete, filter out the residue, dry in an oven for 12 hours, and grind to obtain modified nano silicon nitride.

6. The rat-ant-proof flame-retardant medium-voltage cable according to claim 5, characterized in that: The usage ratio of nano silicon nitride, toluene and vinyltrimethoxysilane is 2g:100mL:5g.

7. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: The lubricant is one of epoxidized soybean oil and paraffin.

8. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: The antioxidant is a hindered phenol antioxidant.

9. The rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: The cross-linking sensitizer is one of triallyl cyanurate, triallyl isocyanurate and trimethylolpropane trimethacrylate.

10. The method for manufacturing a rat-ant-proof flame-retardant medium-voltage cable according to claim 1, characterized in that: The following steps are involved: The conductor shielding layer and the insulating layer are sequentially extruded on the conductor, the surface of the insulating layer is covered with a metal shielding layer, and then the protective sheath material is extruded and covered on the surface of the metal shielding layer, and cross-linked to obtain a rat-ant-proof flame-retardant medium-voltage cable.

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