Flame-retardant cable material for new energy charging pile

Abstract

The invention provides a flame-retardant cable material of a new energy charging pile. The flame-retardant cable material comprises the following raw materials in parts by weight: 80-100 parts of halogen-free cross-linked polyolefin, 30-40 parts of modified polyphenylene sulfide, 20-25 parts of a composite plasticizer, 10-15 parts of a nano flame retardant and 5-10 parts of a compatilizer. The preparation method of the modified polyphenylene sulfide comprises the following steps: drying polyphenylene sulfide particles, adding the dried polyphenylene sulfide particles, a styrene-ethylene-butylene-styrene block copolymer and acetyl trioctyl citrate into a high-speed mixer, uniformly mixing, introducing mixed gas, generating plasma under the action of high-frequency electromagnetic oscillation, introducing nitrogen to recover normal pressure, and carrying out high-speed electromagnetic oscillation to obtain the modified polyphenylene sulfide. And carrying out segmented temperature control extrusion granulation by using a twin-screw extruder to obtain the modified polyphenylene sulfide. The flame-retardant cable material prepared from the material disclosed by the invention is high in thermal stability, various components are matched and have a synergistic effect, and the obtained new energy charging cable material has an application effect while the daily use requirements of the cable material for the new energy charging pile are met.

Description

Technical Field

[0001] The present invention relates to the technical field of flame-retardant cable materials, and in particular to a flame-retardant cable material for a new energy charging pile. Background Art

[0002] New energy and green travel are a new mode of transportation, and the safety of charging stations is a major concern. Standard DC / AC charging stations for electric vehicles are being installed in large numbers. During the charging process, these stations have specific requirements for signal control and transmission network systems for voltage and current. Currently, new energy charging stations that offer high-voltage and high-temperature resistance, electromagnetic interference protection, and stable signal transmission are more in line with market demand. Cable materials used in new energy charging stations suffer from insufficient tensile strength and poor flame retardancy and heat resistance. While traditional polyvinyl chloride (PVC) materials offer advantages such as low price, simple preparation, and a high oxygen index, they also have drawbacks, including poor high-temperature resistance, fire hazards, the presence of phthalate plasticizers, non-compliance with REACH regulations, environmental concerns, and the large amount of liquid plasticizers added, which poses a potential risk of precipitation. Summary of the Invention

[0003] In view of this, the present invention provides a flame retardant cable material for a new energy charging pile to meet the charging needs of new energy.

[0004] The technical solution of the present invention is achieved as follows:

[0005] A flame-retardant cable material for a new energy charging pile comprises the following raw materials in parts by weight: 80-100 parts of low-smoke halogen-free irradiated cross-linked polyolefin, 30-40 parts of modified polyphenylene sulfide, 20-25 parts of a composite plasticizer, 10-15 parts of a nano flame retardant, and 5-10 parts of a compatibilizer. The preparation of the modified polyphenylene sulfide comprises the following steps:

[0006] S1: drying the polyphenylene sulfide particles to reduce the water content to less than 3%, thereby obtaining dried polyphenylene sulfide particles;

[0007] S2: adding dry polyphenylene sulfide particles, styrene-ethylene-butylene-styrene block copolymer and acetyl trioctyl citrate into a high-speed mixer and mixing them uniformly to obtain mixture I;

[0008] S3: Mixture I is introduced into a mixed gas to generate plasma under the action of high-frequency electromagnetic oscillation, nitrogen is introduced to restore the pressure to normal, and the mixture is sealed in a dry environment to obtain mixture II;

[0009] S4: Mixture II is extruded and granulated by a twin-screw extruder with segmented temperature control to obtain modified polyphenylene sulfide.

[0010] Furthermore, in step S1, the drying temperature is 120-125° C., and the drying time is 3-5 hours.

[0011] Further, in step S2, the mass ratio of the dry polyphenylene sulfide particles, styrene-ethylene-butylene-styrene block copolymer and acetyl tricresyl citrate is 80-100:15-20:5-10.

[0012] Further, in step S3, the mixed gas is argon and oxygen with a mass ratio of 4-6:1, and the gas flow rate is 20-50 sccm.

[0013] Further, in step S3, the high-frequency electromagnetic oscillation has a radio frequency power of 100-120 W, an electrode spacing of 10-20 mm, and a time of 3-6 min.

[0014] Further, in step S4, the temperature of the feeding section is 150-170℃, the temperature of the melting section is 290-310℃, the temperature of the homogenizing section is 280-300℃, the initial screw speed is 40-50 r / min, the production screw speed is 250-300 r / min, the back pressure is 18-22 Mpa, and the die head pressure is 60-80 Mpa.

[0015] Further, the low-smoke halogen-free irradiation cross-linked polyolefin is composed of 45-55 parts by mass of linear low-density polyethylene, 5-10 parts of ethylene-vinyl acetate copolymer, 25-30 parts of aluminum hydroxide, 10-15 parts of magnesium hydroxide, 1-3 parts of silicone resin, 1-2 parts of triallyl isocyanurate, 0.5-1 part of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, 1-2 parts of zinc stearate, and 1-3 parts of zinc molybdate.

[0016] Further, the nano flame retardant includes one of layered nano zirconium phosphate, carbon nanotube, nano magnesium hydroxide, and nano aluminum hydroxide.

[0017] Further, the composite plasticizer includes at least one of dioctyl phthalate, acetyl tricresyl citrate, and acetyl tributyl citrate; and the phase solvent is maleic anhydride grafted ethylene-octene copolymer.

[0018] The preparation steps of the flame-retardant cable material include: mixing the low-smoke halogen-free irradiation cross-linked polyolefin and the modified polyphenylene sulfide, sealing after passing nitrogen, and stirring at a temperature of 45-55℃ and a speed of 200-300 rmp for 20-25 min; adding the phase solvent again, sealing after passing nitrogen again, heating to 55-60℃, and then stirring at a speed of 400-500 rmp for 20-25 min to obtain a mixture; adding the composite plasticizer and the nano flame retardant to the mixture, heating to 65-75℃, and stirring uniformly at a speed of 400-500 rmp to obtain a cable material for new energy charging piles.

[0019] Compared with the prior art, the present application has the beneficial effects that:

[0020] The flame-retardant cable material of the new energy charging pile has enhanced thermal stability, good flame-retardant effect, and good tensile strength, can meet the daily use requirements of the cable material for the new energy charging pile, and has application value. The addition of the modified polyphenylene sulfide in the raw material enhances the flame-retardant effect of the cable material, has good thermal stability, improves the high-temperature resistance, and can reduce the hidden danger of high-temperature resistance of the cable material. DETAILED DESCRIPTION

[0021] In order to better understand the technical content of the present application, specific examples are provided below to further illustrate the present application. The experimental methods used in the embodiments of the present application are conventional methods unless otherwise specified.

[0022] The materials, reagents, etc. used in the embodiments of the present application can be obtained from commercial channels unless otherwise specified.

[0023] The manufacturer of the styrene-ethylene-butylene-styrene block copolymer is Dongguan Hui Bai Plastic Raw Material Co., Ltd., and the product name is Taiwan Taipol SEBS Taipol 7131, and the model number is 7131. The manufacturer of the ethylene-vinyl acetate copolymer is Guangzhou Binlong Chemical Co., Ltd., the model number is UL15028, the tensile strength is 6.5MPA, and the elongation is 700%.

[0024] Preparation Example 1

[0025] The preparation of the modified polyphenylene sulfide includes the following steps:

[0026] Step (1): dry the polyphenylene sulfide particles, the drying temperature is 120℃, the drying time is 3 hours, and the water content of the dried polyphenylene sulfide particles is less than 3% after drying, and the dried polyphenylene sulfide particles are obtained;

[0027] Step (2): add the dried polyphenylene sulfide particles, styrene-ethylene-butylene-styrene block copolymer and acetyl citrate trioctyl ester with a mass ratio of 80:15:5 into a high-speed mixer, mix uniformly, and obtain a mixture I;

[0028] Step (3): pass the mixture I into a mixed gas, the mixed gas is argon and oxygen with a mass ratio of 4:1, the gas flow is 20sccm, after passing the mixed gas, under the action of high-frequency electromagnetic oscillation, plasma is generated, wherein the radio frequency power of the high-frequency electromagnetic oscillation is 100W, the electrode spacing is 10mm, the time is 3min, nitrogen is passed again to restore normal pressure, and the mixture II is sealed in a dry environment;

[0029] Step (4): The mixture II is granulated by temperature-controlling extrusion in sections through a twin-screw extruder. In the granulation, the temperature of the feeding section of the twin screw is 150°C, the temperature of the melting section is 290°C, the temperature of the homogenizing section is 280°C, the initial rotating speed of the screw is 40 r / min, the rotating speed in production is 250 r / min, the back pressure is 18 Mpa, the head pressure is 60 Mpa, and the modified polyphenylene sulfide is obtained after the extrusion granulation.

[0030] Preparation Example 2

[0031] The preparation of the modified polyphenylene sulfide comprises the following steps:

[0032] Step (1): The polyphenylene sulfide particles are dried at a temperature of 125°C for 5 hours, and the water content of the dried polyphenylene sulfide particles is less than 2% after drying, and the dried polyphenylene sulfide particles are obtained;

[0033] Step (2): The dried polyphenylene sulfide particles, the styrene-ethylene-butylene-styrene block copolymer and the acetyl tricetyl citrate with a mass ratio of 100:20:10 are added into a high-speed mixer and uniformly mixed to obtain a mixture I;

[0034] Step (3): The mixture I is passed into a mixed gas, the mixed gas is argon and oxygen with a mass ratio of 6:1, and the gas flow is 50 sccm. After the mixed gas is passed in, the plasma is generated under the action of high-frequency electromagnetic oscillation, wherein the radio frequency power of the high-frequency electromagnetic oscillation is 120 W, the electrode spacing is 20 mm, and the time is 6 min. After nitrogen is passed in again, the normal pressure is restored, and the mixture II is sealed in a dry environment;

[0035] Step (4): The mixture II is granulated by temperature-controlling extrusion in sections through a twin-screw extruder. In the granulation, the temperature of the feeding section of the twin screw is 170°C, the temperature of the melting section is 310°C, the temperature of the homogenizing section is 300°C, the initial rotating speed of the screw is 50 r / min, the rotating speed in production is 300 r / min, the back pressure is 22 Mpa, the head pressure is 80 Mpa, and the modified polyphenylene sulfide is obtained after the extrusion granulation.

[0036] Preparation Example 3

[0037] The preparation of the modified polyphenylene sulfide comprises the following steps:

[0038] Step (1): The polyphenylene sulfide particles are dried at a temperature of 120°C for 4 hours, and the water content of the dried polyphenylene sulfide particles is less than 2% after drying, and the dried polyphenylene sulfide particles are obtained;

[0039] Step (2): The dried polyphenylene sulfide particles, the styrene-ethylene-butylene-styrene block copolymer and the acetyl tricetyl citrate with a mass ratio of 90:20:7 are added into a high-speed mixer and uniformly mixed to obtain a mixture I;

[0040] Step (3): the mixture I is passed into a mixed gas, the mixed gas is argon and oxygen with a mass ratio of 5:1, the gas flow is 40 sccm, after the mixed gas is passed in, plasma is generated under the action of high-frequency electromagnetic oscillation, wherein the radio frequency power of the high-frequency electromagnetic oscillation is 110 W, the electrode spacing is 15 mm, the time is 5 min, nitrogen is passed in again to restore normal pressure, and the mixture II is obtained after being sealed in a dry environment;

[0041] Step (4): the mixture II is granulated by temperature control section by section through a double screw extruder, in the granulation, the temperature of the feeding section of the double screw is 160 DEG C, the temperature of the melting section is 300 DEG C, the temperature of the homogenizing section is 290 DEG C, the initial rotating speed of the screw is 45 r / min, the rotating speed in production is 250 r / min, the back pressure is 20 Mpa, and the head pressure is 70 Mpa, after the extrusion granulation, the modified polyphenylene sulfide is obtained.

[0042] Example 1

[0043] A new energy charging pile flame-retardant cable material, comprising the following raw materials by weight: low-smoke halogen-free irradiation cross-linked polyolefin 80 parts, modified polyphenylene sulfide prepared in preparation example 1 30 parts, dioctyl phthalate (composite plasticizer) 20 parts, layered nano zirconium phosphate (nano flame retardant) 10 parts, maleic anhydride grafted ethylene-octene copolymer (compatibilizer) 5 parts.

[0044] The low-smoke halogen-free irradiation cross-linked polyolefin is composed of 45 parts of linear low-density polyethylene, 5 parts of ethylene-vinyl acetate copolymer, 25 parts of aluminum hydroxide, 10 parts of magnesium hydroxide, 1 part of silicone resin, 1 part of triallyl isocyanurate, 0.5 parts of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 1 part of zinc stearate and 1 part of zinc molybdate.

[0045] The preparation method of the above flame-retardant cable material comprises the following steps: mixing the low-smoke halogen-free irradiation cross-linked polyolefin and the modified polyphenylene sulfide, sealing after passing nitrogen, and stirring, the stirring temperature is 45 DEG C, the rotating speed is 200 rmp, after stirring for 20 min, the compatibilizer is added, sealing after passing nitrogen again, the temperature is raised to 55 DEG C, the rotating speed is raised to 400 rmp, stirring for 20 min, the mixture is obtained; the composite plasticizer and the nano flame retardant are added to the mixture, the temperature is raised to 65 DEG C, the rotating speed is 400 rmp, stirring is uniform, extrusion molding, cooling and granulation, and the cable material for new energy charging pile is obtained.

[0046] Example 2

[0047] A new energy charging pile of flame-retardant cable material, comprising the following raw materials by weight: low smoke halogen-free irradiation cross-linked polyolefin 100 parts, modified polyphenylene sulfide prepared in preparation example 2 40 parts, acetyl citric acid trioctyl ester (complex plasticizer) 25 parts, carbon nanotube (nano flame retardant) 15 parts, maleic anhydride grafted ethylene-octene copolymer (solvent) 10 parts.

[0048] The low smoke halogen-free irradiation cross-linked polyolefin is composed of 55 parts of linear low density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 30 parts of aluminum hydroxide, 15 parts of magnesium hydroxide, 3 parts of silicone resin, 2 parts of triallyl isocyanurate, 1 part of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 2 parts of zinc stearate, and 3 parts of zinc molybdate.

[0049] The preparation method of the above flame-retardant cable material comprises the following steps: mixing the low smoke halogen-free irradiation cross-linked polyolefin and the modified polyphenylene sulfide, sealing after nitrogen blowing, and stirring at a stirring temperature of 55°C and a stirring speed of 300rmp; after stirring for 25 minutes, adding the solvent, sealing again after nitrogen blowing, heating to 60°C, and then increasing the stirring speed to 500rmp; stirring for 25 minutes to obtain a mixture; adding the complex plasticizer and the nano flame retardant to the mixture, heating to 75°C, stirring uniformly at a stirring speed of 500rmp, and then extruding, cooling, and granulating to obtain the cable material for new energy charging piles.

[0050] Example 3

[0051] A new energy charging pile of flame-retardant cable material, comprising the following raw materials by weight: low smoke halogen-free irradiation cross-linked polyolefin 90 parts, modified polyphenylene sulfide prepared in preparation example 3 35 parts, acetyl citric acid tri-n-butyl ester (complex plasticizer) 25 parts, nano magnesium hydroxide (nano flame retardant) 15 parts, maleic anhydride grafted ethylene-octene copolymer (solvent) 8 parts.

[0052] The low smoke halogen-free irradiation cross-linked polyolefin is composed of 50 parts of linear low density polyethylene, 7 parts of ethylene-vinyl acetate copolymer, 30 parts of aluminum hydroxide, 12 parts of magnesium hydroxide, 2 parts of silicone resin, 2 parts of triallyl isocyanurate, 1 part of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 1.5 parts of zinc stearate, and 2 parts of zinc molybdate.

[0053] The preparation method of the above flame-retardant cable material comprises the following steps: mixing low-smoke halogen-free irradiation cross-linked polyolefin and modified polyphenylene sulfide, sealing after passing nitrogen, and stirring, the stirring temperature is 50℃, the rotating speed is 250rmp, after stirring for 25min, adding phase solvent, sealing again after passing nitrogen again, increasing the temperature to 55℃, increasing the rotating speed to 450rmp, stirring for 25min, obtaining the mixture; adding composite plasticizer and nano flame retardant into the mixture, increasing the temperature to 70℃, stirring uniformly at the rotating speed of 450rmp, extruding and molding, cooling and granulating, obtaining the cable material for new energy charging pile.

[0054] Comparative example

[0055] The difference between comparative example 1 and example 3 is that the modified polyphenylene sulfide is replaced by commercially available polyphenylene sulfide, which is purchased from Dongguan Yirong Plastic Raw Material Co., Ltd., the processing level is injection molding grade and extrusion grade, the hardness is 70HB, and the level is first grade.

[0056] Comparative example 1 is a kind of flame-retardant cable material for new energy charging pile, which comprises the following raw materials by weight: low-smoke halogen-free irradiation cross-linked polyolefin 90 parts, commercially available polyphenylene sulfide prepared in preparation example 3 35 parts, composite plasticizer acetyl citric acid tributyl ester 25 parts, nano flame retardant nano magnesium hydroxide 15 parts, and phase solvent maleic anhydride grafted ethylene-octene copolymer 8 parts.

[0057] The low-smoke halogen-free irradiation cross-linked polyolefin is composed of 50 parts of linear low-density polyethylene, 7 parts of ethylene-vinyl acetate copolymer, 30 parts of aluminum hydroxide, 12 parts of magnesium hydroxide, 2 parts of silicone resin, 2 parts of triallyl isocyanurate, 1 part of tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester, 1.5 parts of zinc stearate, and 2 parts of zinc molybdate.

[0058] Commercially available control

[0059] The commercially available flame-retardant cable material for charging pile is purchased from Dongguan Pures Plastic Raw Material Co., Ltd., the specific gravity is 1.10-1.25g / cm 3 , the molding shrinkage is 1.2%, the elongation at break is 550%, the embrittlement temperature is -62℃, the tensile strength is 15MPa, the flame retardancy is UL94 V0, the tear strength is 85, the glass transition temperature is 100.6-106.1℃, and the hardness is 60A-90D.

[0060] Test one

[0061] The cable materials obtained in the examples and comparative examples were plasticized and sheeted on an open plasticizer at a plasticizing temperature of 150°C. Preheated in a hydraulic press for 15 minutes, pressurized to 15 MPa, maintained for 5 minutes, pressurized and cooled to room temperature, and allowed to stand for 5 hours to obtain the cable material. In order to evaluate the flame retardancy of the material, a vertical combustion test and three flame retardancy levels were used to study the conditions, the cable material samples were segmented, and the flame retardancy was tested in a test instrument. The material was molded into 5-type dumbbell-shaped specimens with a thickness of (1±0.1) mm. The environmental conditions for cutting the test samples were a temperature of 25°C and a humidity of 45%, and the samples were left for 6 hours.

[0062] The combustion level evaluation formula is:

[0063]

[0064] Where: t f is the flaming burning time of all the specimens in each group (s); t1+t2 is the flaming burning time of each specimen or the sum of the burning times after the second test (s).

[0065] Table 1 Vertical combustion performance of cable materials in different groups

[0066]

[0067] As can be seen from Table 1, the cable materials prepared by the methods of Examples 1, 2, and 3 exhibited excellent vertical combustion flame retardancy, with burning times all below 50 seconds. Based on the combustion performance of the test strips, the lower the vertical combustion rating, the better the flame retardant of the cable material, indicating that the cable materials prepared by the methods of the examples exhibited excellent flame retardancy.

[0068] The tensile strength and oxygen index of different cable material groups were measured and statistically analyzed (see Table 2). Tensile strength was determined according to GB / T 2951.11-2008, while the limiting oxygen index was determined according to GB / T 2406.2-2009A. The limiting oxygen index is the minimum volume percentage of oxygen required to sustain combustion of a cable polymer material after ignition in a mixture of oxygen and nitrogen. Cable sample concentrations were measured in an oxygen index instrument at an ambient temperature of 25°C and a humidity of 45%. Each sample group was tested three times, and the average value was taken.

[0069] The calculation formula of limiting oxygen index is:

[0070]

[0071] From table 2, it can be seen that the tensile strength of the cable material prepared by the method of example 1, example 2 and example 3 is good, and the limiting oxygen index is higher than that of the comparative example and the commercially available control. It shows that the tensile strength and limiting oxygen index of the cable material are decreased after the modification of the raw material of the present application, that is, the modified polyphenylene sulfide is replaced by commercially available polyphenylene sulfide.

[0072] Table 2 tensile strength and oxygen index statistics table of cable material of different groups

[0073] Group Tensile strength (MPa) Limiting oxygen index (%) Example 1 21.6 34 Example 2 19.5 32 Example 3 22.8 33 Comparative Example 15.2 24 Commercial Control 12.1 20

[0074] Conclusion: The flame-retardant cable material of the new energy charging pile of the present application has multiple components, synergistic effect, enhanced thermal stability, good flame-retardant effect, and good tensile strength, which can meet the daily use requirements of the cable material for new energy charging piles and has application value. After the modified polyphenylene sulfide is replaced by commercially available polyphenylene sulfide in the comparative example, the flame-retardant effect is poor and the tensile strength is reduced. Therefore, the addition of modified polyphenylene sulfide in the raw material enhances the thermal stability of the cable material and has good flame-retardant effect.

[0075] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flame retardant cable material for a new energy charging pile, characterized in that: The method comprises the following raw materials in parts by weight: 80-100 parts of low-smoke halogen-free radiation cross-linked polyolefin, 30-40 parts of modified polyphenylene sulfide, 20-25 parts of composite plasticizer, 10-15 parts of nano flame retardant, and 5-10 parts of compatibilizer. The preparation of the modified polyphenylene sulfide comprises the following steps: S1: drying the polyphenylene sulfide particles to reduce the water content to less than 3%, thereby obtaining dried polyphenylene sulfide particles; S2: adding dry polyphenylene sulfide particles, styrene-ethylene-butylene-styrene block copolymer and acetyl trioctyl citrate into a high-speed mixer and mixing them uniformly to obtain mixture I; S3: Mixture I is introduced into a mixed gas to generate plasma under the action of high-frequency electromagnetic oscillation, nitrogen is introduced to restore the pressure to normal, and the mixture is sealed in a dry environment to obtain mixture II; S4: Mixture II is extruded and granulated by a twin-screw extruder with segmented temperature control to obtain modified polyphenylene sulfide.

2. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: In step S1, the drying temperature is 120-125° C., and the drying time is 3-5 hours.

3. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: In step S2, the mass ratio of the dry polyphenylene sulfide particles to the styrene-ethylene-butylene-styrene block copolymer and acetyl trioctyl citrate is 80-100:15-20:5-10.

4. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: In step S3, the mixed gas is argon and oxygen in a mass ratio of 4-6:1, and the gas flow rate is 20-50 sccm.

5. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: In step S3, the radio frequency power of the high-frequency electromagnetic oscillation is 100-120 W, the electrode spacing is 10-20 mm, and the time is 3-6 minutes.

6. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: In step S4, the temperature of the feeding section is 150-170°C, the temperature of the melting section is 290-310°C, the temperature of the homogenizing section is 280-300°C, the initial speed of the screw is 40-50r / min, the speed during production is 250-300r / min, the back pressure is 18-22Mpa, and the head pressure is 60-80Mpa.

7. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: The low-smoke, halogen-free, radiation-crosslinked polyolefin is composed of the following raw materials in parts by weight: 45-55 parts of linear low-density polyethylene, 5-10 parts of ethylene-vinyl acetate copolymer, 25-30 parts of aluminum hydroxide, 10-15 parts of magnesium hydroxide, 1-3 parts of silicone resin, 1-2 parts of triallyl isocyanurate, 0.5-1 part of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 1-2 parts of zinc stearate, and 1-3 parts of zinc molybdate.

8. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: The nano flame retardant includes at least one of layered nano zirconium phosphate, carbon nanotubes, nano magnesium hydroxide, and nano aluminum hydroxide.

9. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: The composite plasticizer comprises at least one of dioctyl phthalate, trioctyl acetyl citrate and tributyl acetyl citrate; and the phase solvent is maleic anhydride grafted ethylene-octene copolymer.

10. The flame-retardant cable material for a new energy charging pile according to claim 1, characterized in that: The preparation steps of the flame-retardant cable material include: mixing low-smoke halogen-free irradiated cross-linked polyolefin and modified polyphenylene sulfide, sealing after passing nitrogen, and then stirring, the stirring temperature is 45-55°C, the speed is 200-300 rpm, stirring for 20-25 minutes, adding a phase solvent, passing nitrogen again and sealing, heating to 55-60°C, increasing the speed to 400-500 rpm, stirring for 20-25 minutes to obtain a mixture; adding a composite plasticizer and a nano flame retardant to the mixture, heating to 65-75°C, stirring evenly at a speed of 400-500 rpm, extruding and molding, cooling and granulating to obtain a cable material for new energy charging piles.

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