Cable sheath material for charging of electric vehicle and preparation method of cable sheath material

Abstract

The invention discloses a cable sheath material for charging an electric vehicle and a preparation method of the cable sheath material. The cable sheath material for charging the electric vehicle comprises the following components in percentage by mass: 20-35% of styrene elastomer, 10-30% of white oil, 15-35% of polypropylene resin, 25-40% of efficient halogen-free flame retardant, 2-5% of organosilicon compound and 1-4% of anti-aging agent. The efficient halogen-free flame retardant is used for replacing a traditional nitrogen flame retardant, has the characteristics of being low in filling amount, good in flame retardant effect and small in influence on mechanical performance, does not release a large amount of corrosive gas during combustion, and meanwhile meets the mechanical performance requirement of the halogen-free flame retardant material for the electric vehicle charging cable. A wire prepared from the cable material has the performance of resisting the high temperature of 105 DEG C and the low temperature of-40 DEG C, also has the excellent characteristics of being halogen-free, environment-friendly, scratch-resistant, high in mechanical property, oil-resistant, water-resistant, high in tear resistance and the like, meets the standard requirements of GB / T33594-2017'cables for charging of electric automobiles', and has a very wide market application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoplastic halogen-free flame-retardant TPE materials, and in particular to a high-efficiency halogen-free flame-retardant cable material that meets standards for electric vehicle charging cables and a preparation method thereof. Background Art

[0002] TPE, short for thermoplastic elastomer, is a polymer material that combines the elasticity of rubber with the ease of processing of plastic. Composed of resin and rubber segments, it can be reversibly processed at high temperatures. At room temperature, it exhibits the high elasticity of rubber (it can stretch to several times its original length and then recover), yet can be injection molded like plastic at elevated temperatures. It can be produced by injection molding, extrusion, and blow molding, and boasts environmentally friendly, non-toxic properties, a flexible, comfortable feel, and a smooth appearance. The addition of flame retardants effectively prevents, delays, and terminates flames when exposed to external fire sources, achieving flame retardancy.

[0003] Existing halogen-free flame retardants mainly include inorganic flame retardants (such as magnesium hydroxide, aluminum hydroxide), phosphorus-based flame retardants (organic / inorganic phosphorus compounds), nitrogen-based flame retardants (such as melamine derivatives), silicon-based flame retardants, metal oxides and composite flame retardants (such as phosphorus-nitrogen synergistic systems).

[0004] Currently, the most widely used halogen-free flame retardants on the market are inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide. These flame retardants offer advantages such as low price, abundant availability, excellent smoke suppression, and the absence of corrosive gases and other harmful substances during combustion. However, the dosage of these flame retardants is generally limited to 50%-70%, otherwise the flame retardant effect is poor. As the dosage increases, the mechanical properties of the product deteriorate, the processing performance becomes relatively poor, and the hand feel is also poor. Furthermore, while conventional phosphorus-based flame retardants can achieve good flame retardancy at low dosages, their high volatility significantly reduces the durability of the material and their poor compatibility leads to a significant decline in the mechanical properties of the resulting product. For example, the tensile strength of cable materials fails to reach 10 MPa, and the elongation fails to meet the required 300%. Furthermore, the surface finish is difficult to maintain, and the tear resistance, oil resistance, scratch resistance, and high and low temperature resistance are poor. These flame retardants cannot simultaneously meet the requirements for comfortable hand feel, mechanical properties, scratch resistance, oil resistance, low temperature resistance, heat resistance, and tear resistance. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned technologies and to provide a cable sheath material for electric vehicle charging, which has low addition amount and can simultaneously meet the standard requirements of low volatility, good material durability, excellent compatibility, mechanical properties, oil resistance and scratch resistance, and a preparation method thereof.

[0006] To this end, the present invention provides a cable sheath material for electric vehicle charging, comprising the following components by mass fraction:

[0007] Styrene elastomer: 20-35%

[0008] White oil 10~30%

[0009] Polypropylene resin: 15-35%

[0010] High-efficiency halogen-free flame retardant: 25-40%

[0011] Organic silicon compound 2~5%

[0012] Anti-aging agent 1~4%

[0013] Preferably, the high-efficiency halogen-free flame retardant includes diethyl phosphinate, diethyl phosphinate glycidyl ester and a nitrogen compound, the mass percentage of diethyl phosphinate and diethyl phosphinate glycidyl ester is 25-40%, and the mass percentage of the nitrogen compound is 60-75%.

[0014] Among them, the structural formula of diethylphosphinate and diethylphosphinate glycidyl ester is:

[0015]

[0016] The nitrogen compound is at least one of melamine orthophosphate, melamine pyrophosphate, melamine polyphosphate, melamine cyanurate, and ammonium polyphosphate.

[0017] When used, diethylphosphinate and diethylphosphinate glycidyl ester will cross-link themselves during combustion, and simultaneously undergo a cross-linking reaction with the silicone resin during cracking, thereby increasing the viscosity of the system.

[0018] The high-efficiency halogen-free flame retardant can also be used in combination with phosphine-based flame retardants and silicon-based flame retardants to improve the flame retardant efficiency of cable materials.

[0019] Preferably, the styrene elastomer is a block copolymer of butadiene or isoprene and styrene, specifically including at least one of styrene-butadiene-styrene, styrene-ethylene / butylene-styrene, styrene-isoprene-styrene, and styrene-ethylene / propylene-styrene.

[0020] Preferably, the viscosity of the white oil is at least one of 10#, 15#, 26#, 32#, 46#, 70#, 90#, and 100#.

[0021] Preferably, the polypropylene resin is at least one of isotactic polypropylene, atactic polypropylene, syndiotactic polypropylene, block copolymer polypropylene, random copolymer polypropylene, high melt index polypropylene, and high impact polypropylene.

[0022] Preferably, the organosilicon compound is at least one of polydimethylsiloxane, methyl organosilicon resin, ethyl organosilicon resin, phenyl organosilicon resin, acrylic grafted silicone resin, polyurethane grafted silicone resin, methylphenyl copolymerized silicone resin, and modified organosilicon resin.

[0023] Preferably, the antioxidant is at least one of amine antioxidants, phenolic antioxidants, phosphite antioxidants, and 2-mercaptobenzimidazole zinc salt; specifically, at least one of antioxidant 1010, antioxidant 168, and antioxidant 300.

[0024] A method for preparing a cable sheath material for electric vehicle charging comprises the following steps:

[0025] (1) Preparation of high-efficiency halogen-free flame retardant:

[0026] Add diethyl phosphinate, diethyl phosphinate glycidyl ester and nitrogen compound flame retardant into a high-speed mixer according to the ratio of 25-40% by mass of diethyl phosphinate and diethyl phosphinate glycidyl ester to 60-75% by mass of nitrogen compound flame retardant, stir evenly and set aside;

[0027] (2) Preparation of raw materials:

[0028] Weigh the following raw materials according to their mass percentage composition;

[0029] Styrene elastomer: 20-35%,

[0030] White oil: 10-30%,

[0031] Polypropylene resin: 15-35%,

[0032] High-efficiency halogen-free flame retardant: 25-40%,

[0033] Organic silicon compounds: 2-5%,

[0034] Anti-aging agent: 1-4%;

[0035] (3) Mixing of raw materials:

[0036] The styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant, organosilicon compound and anti-aging agent prepared in step (2) are mixed and poured into a mixing pot and stirred evenly to obtain a mixed material;

[0037] (4) Extrusion of mixed materials: adding the mixed materials in step (3) into a twin-screw extruder for melting, conveying and extrusion at an extrusion temperature of 180-200°C;

[0038] (5) Cooling and granulating: The molten output extruded in step (4) is cooled to prepare granules, which are high-efficiency halogen-free flame-retardant cable materials.

[0039] The present invention provides a cable sheath material for electric vehicle charging and a preparation method thereof, which has the following beneficial effects:

[0040] (1) The high-efficiency halogen-free flame retardant used in the present invention, wherein the diethylphosphinylglycerol ester and diethylphosphinate glycidyl ester are based on the original diethylphosphinate aluminum, and the metal ions are removed. The flexibility of the diethylphosphinate aluminum is increased while the phosphorus content is kept at a constant level. Not only can the diethylphosphinate aluminum undergo cross-linking during combustion, but it can also undergo cracking and cross-linking reaction with the silicone resin to increase the viscosity of the system, provide free radical quenching, and rapidly expand to form a fireproof carbon layer, covering the surface of the material, isolating oxygen and combustibles, effectively preventing the substrate from further burning, and also ensuring that the substrate's temperature resistance is not greatly affected.

[0041] (2) The nitrogen compounds in the high-efficiency halogen-free flame retardant can quickly decompose to produce non-flammable gases, which can not only dilute the oxygen in the flame zone, but also rapidly expand the carbon layer produced by the decomposition of diethylphosphinate (poly)aminopolyalkylenephosphonate aluminum, and play a role in heat insulation and oxygen isolation for the undecomposed substrate inside. The synergistic effect further achieves the purpose of preventing the flame on the surface of the cable material from spreading further and causing it to quickly extinguish into carbon.

[0042] (3) Compared with the traditional halogen-free aluminum hydroxide and magnesium hydroxide inorganic flame retardant systems, the new modified halogen-free flame retardant used in the present invention works synergistically with the organosilicon compound, has the advantages of small addition amount, high flame retardant efficiency, low smoke, and no release of large amounts of corrosive gases during combustion, small effect on the mechanical properties of the product (meeting the requirements of tensile strength ≥10mpa, elongation at break ≥300%), excellent processing performance, and high flame retardant efficiency (all kinds of wires can meet the GB / T18380-12 standard).

[0043] The electric vehicle charging cable sheath material of the present invention not only has good high and low temperature resistance, excellent mechanical properties, good scratch resistance, and oil resistance, but also has flame retardant properties that can meet the indicators of GB / 33594-2017 "Electric Vehicle Charging Cable", filling the market gap for S90 series electric vehicle charging cables and being widely used in the field of electric vehicle cables. DETAILED DESCRIPTION

[0044] The present invention is further described below with reference to specific examples to facilitate understanding. The methods used in this invention are conventional unless otherwise specified. Raw materials used, such as diethylphosphinate and glycidyl diethylphosphinate, are products of Weihai Hairun New Materials Technology Co., Ltd., and the silicon-based flame retardant is a polysiloxane polymer. Other raw materials and equipment, unless otherwise specified, are conventional commercially available products.

[0045] Example 1

[0046] Diethylphosphinate and melamine cyanurate were added into a high-speed mixer according to the proportions in Example 1 in Table 1, stirred evenly, and then discharged to obtain a high-efficiency halogen-free flame retardant.

[0047] Example 2

[0048] Glycidyl diethylphosphinate and melamine polyphosphate were added into a high-speed mixer according to the proportions in Example 2 in Table 1, stirred evenly, and then discharged to obtain a high-efficiency halogen-free flame retardant.

[0049] Example 3

[0050] Diethylphosphinate, diethylphosphinate glycidyl ester and melamine cyanurate were added into a high-speed mixer according to the proportions in Example 3 in Table 1, stirred evenly and then discharged to obtain a high-efficiency halogen-free flame retardant.

[0051] Example 4

[0052] Diethylphosphinate, diethylphosphinate glycidyl ester and melamine polyphosphate were added into a high-speed mixer according to the proportions in Example 4 in Table 1, stirred evenly and then discharged to obtain a high-efficiency halogen-free flame retardant.

[0053] Example 5

[0054] Diethylphosphinate, diethylphosphinate glycidyl ester and melamine cyanurate were added into a high-speed mixer according to the proportions in Example 5 in Table 1, stirred evenly and then discharged to obtain a high-efficiency halogen-free flame retardant.

[0055] Example 6

[0056] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0057] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 3, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 6 in Table 2 and mixed evenly.

[0058] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0059] Example 7

[0060] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0061] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 3, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 7 in Table 2 and mixed evenly.

[0062] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0063] Example 8

[0064] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0065] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 3, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 8 in Table 2 and mixed evenly.

[0066] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0067] Example 9

[0068] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0069] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 3, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 9 in Table 2 and mixed evenly.

[0070] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0071] Example 10

[0072] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0073] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 3, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 10 in Table 2 and mixed evenly.

[0074] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0075] Example 11

[0076] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0077] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 3, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 11 in Table 2 and mixed evenly.

[0078] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0079] Example 12

[0080] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0081] The raw materials styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant prepared in Example 5, organosilicon compound, and anti-aging agent were put into a mixing pot according to the proportions of Example 12 in Table 2 and mixed evenly.

[0082] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through a die. After cooling, the strands are granulated in a granulator to obtain a cable sheath material for electric vehicle charging.

[0083] Comparative Example 1

[0084] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0085] The raw materials styrene elastomer, white oil, polypropylene resin, inorganic aluminum hydroxide flame retardant, organosilicon compound and anti-aging agent were put into a mixing pot according to the proportions of Comparative Example 1 in Table 2 and mixed evenly.

[0086] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through the die. After cooling, the strands are granulated in a granulator to obtain TPE halogen-free flame-retardant cable material.

[0087] Comparative Example 2

[0088] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0089] The raw materials styrene elastomer, white oil, polypropylene resin, inorganic magnesium hydroxide flame retardant, organosilicon compound and anti-aging agent were put into a mixing pot according to the proportions of Comparative Example 2 in Table 2 and mixed evenly.

[0090] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through the die. After cooling, the strands are granulated in a granulator to obtain TPE halogen-free flame-retardant cable material.

[0091] Comparative Example 3

[0092] The temperature of the twin-screw extruder was raised to 180° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0093] The raw materials styrene elastomer, white oil, polypropylene resin, inorganic aluminum hydroxide, magnesium hydroxide flame retardant, organosilicon compound, and anti-aging agent are put into a mixing pot according to the proportions of Comparative Example 3 in Table 2 and mixed evenly.

[0094] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through the die. After cooling, the strands are granulated in a granulator to obtain TPE halogen-free flame-retardant cable material.

[0095] Comparative Example 4

[0096] The temperature of the twin-screw extruder was raised to 130° C. and kept at this temperature for 30 minutes so that the temperature of each section of the twin-screw extruder was stable at the set temperature.

[0097] The raw materials styrene elastomer, white oil, polypropylene resin, inorganic aluminum hydroxide flame retardant, organosilicon compound and anti-aging agent were put into a mixing pot according to the proportions of Comparative Example 4 in Table 2 and mixed evenly.

[0098] The evenly mixed material is added into the twin-screw extruder from the feeding port of the twin-screw extruder, and is extruded into strands through the die. After cooling, the strands are granulated in a granulator to obtain TPE halogen-free flame-retardant cable material.

[0099] Comparison of experimental results:

[0100] The low-smoke halogen-free cable materials obtained in Examples 6, 7, 8, 9, 10, 11, 12 and Comparative Examples 1, 2, 3, and 4 were prepared into corresponding test specimens according to GB1033, GB2411, GB / T2951.11, GB / T2951.12, GB / T33594-2017, GB / T2951.31, GB / T2951.13, GB / T18380-12, and GB / T2951.21 standards, respectively, to obtain Example 6 group, Example 7 group, Example 8 group, Example 9 group, Example 10 group, Example 11 group, Example 12 group, Control 1 group, Control 2 group, Control 3 group, and Control 4 group of test samples, and then performance tests were carried out in sequence according to the above standards and the UL1581 test method to obtain corresponding performance parameters. The specific proportion data of Examples 6, 7, 8, 9, 10, 11, 12, Comparative Examples 1, 2, 3, and 4 are shown in Table 2. The performance parameters of the test specimens of Example 6, Example 7, Example 8, Example 9, Example 10, Example 11, Example 12, Control 1, Control 2, Control 3, and Control 4 are shown in Table 3.

[0101] Table 1: Ratio of high-efficiency halogen-free flame retardants

[0102] raw material Example 1 Example 2 Example 3 Example 4 Example 5 diethylphosphinate 25 0 20 28 0 Glycidyl diethylphosphinate 0 30 20 0 30 Melamine cyanurate 75 60 70 Melamine polyphosphate 70 72

[0103] Table 2 Example ratios of cable sheath materials for electric vehicle charging

[0104] raw material Styrene-butadiene-styrene Styrene-isoprene-styrene Styrene-ethylene / butylene-styrene 15# white oil 46# white oil 90# white oil Isotactic polypropylene Random polypropylene High melt index polypropylene High-efficiency halogen-free flame retardant aluminum hydroxide magnesium hydroxide Polydimethylsiloxane Methyl silicone resin Phenyl silicone resin Antioxidant 1010 Antioxidant 168 Antioxidant 300 Example 6 23 15 20 35 0 0 3 4 Example 7 20 15 20 40 0 0 3 2 Example 8 25 15 20 35 0 0 3 2 Example 9 20 20 22 31 0 0 5 2 Example 10 35 20 18 23 0 0 2 2 Example 11 20 30 15 30 0 0 3 2 Example 12 27 10 35 25 0 0 2 1 Comparative Example 1 25 15 20 0 36 0 2 2 Comparative Example 2 25 15 20 0 0 36 2 2 Comparative Example 3 25 15 20 0 18 18 2 2 Comparative Example 4 20 10 15 52 0 2 1

[0105] Table 3 Test performance parameters

[0106] performance unit Test Method Example 6 Example 7 Group Example 8 Group Example 9 Group Example 10 Group Example 11 Group Example 12 Group Control group 1 Control group 2 Control group 3 Control group 4 tensile strength Mpa GB / T2951.11 15.6 15.2 14.9 15.1 15.8 15.0 14.6 9.1 8.9 8.9 9.5 Elongation at break % GB / T2951.11 560 580 570 560 560 550 540 210 230 205 198 hardness ShoreA GB2411 80 80 80 81 79 82 81 93 94 93 95 density <![CDATA[g / cm 3 ]]> GB1033 1.01 1.01 1.02 1.01 1.00 1.01 1.03 1.38 1.35 1.35 1.39 Aging performance - GB / T2951.12 pass pass pass pass pass pass pass pass Failed Failed Failed Low temperature bending - GB / T33594-2017 No cracking No cracking No cracking No cracking No cracking No cracking No cracking Cracking Cracking Uncracked pass High temperature pressure - GB / T2951.31 pass pass pass pass pass pass pass Failed Failed Failed Failed Heat shrinkage - GB / T2951.13 pass pass pass pass pass pass pass pass Failed Failed Failed thermal shock - GB / T2951.13 No cracking No cracking No cracking No cracking No cracking No cracking No cracking No cracking Cracking No cracking Cracking Tear resistance N / mm GB / T33594-2017 32 32 33 29 30 34 30 13 12 13 10 Gasoline resistant - GB / T33594-2017 pass pass pass pass pass pass pass Failed Failed Failed Failed Water resistance - GB / T2951.21 pass pass pass pass pass pass pass Failed Failed Failed Failed flame retardant - GB / T18380.12 pass pass pass pass pass pass pass Failed Failed Failed Failed

[0107] The experimental results show that:

[0108] As can be seen from the data in Tables 1, 2, and 3, compared to traditional halogen-free flame-retardant TPE cable materials, the electric vehicle charging cable sheath material of the present invention uses a new modified halogen-free flame retardant and an organosilicon compound to synergistically achieve low addition requirements, high temperature resistance of 105°C and low temperature resistance of -40°C, and other excellent properties such as halogen-free and environmentally friendly, scratch-resistant, high mechanical properties, oil and water resistance, and high tear resistance, meeting the requirements of the GB / T33594-2017 "Electric Vehicle Charging Cable" standard. Furthermore, the cable materials produced by the present invention have all passed the "Electric Vehicle Charging Cable" test standards and have a significant flame retardant effect in practical applications, solving the market gap for halogen-free, environmentally friendly, high and low temperature resistance, high oil resistance, high tear resistance, and high flame retardant cable materials. They can be widely used in fields such as electric vehicle charging cables and charging pile cables.

[0109] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A cable sheath material for electric vehicle charging, characterized in that: Includes the following components by mass fraction: Styrene elastomer: 20-35% White oil 10~30% Polypropylene resin: 15-35% High-efficiency halogen-free flame retardant: 25-40% Organic silicon compound 2~5% Anti-aging agent 1~4%.

2. The electric vehicle charging cable sheath material according to claim 1, characterized in that: The high-efficiency halogen-free flame retardant comprises diethyl phosphinate, diethyl phosphinate glycidyl ester and a nitrogen compound, wherein the mass percentage of the diethyl phosphinate and diethyl phosphinate glycidyl ester is 25-40%.

3. The electric vehicle charging cable sheath material according to claim 2, characterized in that: The nitrogen compound is at least one of melamine orthophosphate, melamine pyrophosphate, melamine polyphosphate, melamine cyanurate, and ammonium polyphosphate.

4. The electric vehicle charging cable sheath material according to claim 1, characterized in that: The styrene elastomer is a block copolymer of butadiene or isoprene and styrene, specifically including at least one of styrene-butadiene-styrene, styrene-ethylene / butylene-styrene, styrene-isoprene-styrene, and styrene-ethylene / propylene-styrene.

5. The electric vehicle charging cable sheath material according to claim 1, characterized in that: The viscosity of the white oil is at least one of 10#, 15#, 26#, 32#, 46#, 70#, 90#, and 100#.

6. The electric vehicle charging cable sheath material according to claim 1, characterized in that: The polypropylene resin is at least one of isotactic polypropylene, atactic polypropylene, syndiotactic polypropylene, block copolymer polypropylene, random copolymer polypropylene, high melt index polypropylene, and high impact polypropylene.

7. The electric vehicle charging cable sheath material according to claim 1, characterized in that: The organosilicon compound is at least one of polydimethylsiloxane, methyl silicone resin, ethyl silicone resin, phenyl silicone resin, acrylic grafted silicone resin, polyurethane grafted silicone resin, methylphenyl copolymer silicone resin, and modified silicone resin.

8. The electric vehicle charging cable sheath material according to claim 1, characterized in that: The anti-aging agent is at least one of amine antioxidants, phenol antioxidants, phosphite antioxidants, and 2-mercaptobenzimidazole zinc salt.

9. A method for preparing a cable sheath material for electric vehicle charging, characterized in that: The following steps are involved: (1) Preparation of high-efficiency halogen-free flame retardant: Add diethyl phosphinate, diethyl phosphinate glycidyl ester and nitrogen compound flame retardant into a high-speed mixer according to the ratio of 25-40% by mass of diethyl phosphinate and diethyl phosphinate glycidyl ester to 60-75% by mass of nitrogen compound flame retardant, stir evenly and set aside; (2) Preparation of raw materials for sheathing materials: Weigh the following raw materials according to their mass percentage composition: Styrene elastomer: 20-35%, White oil: 10-30%, Polypropylene resin: 15-35%, High-efficiency halogen-free flame retardant: 25-40%, Organic silicon compounds: 2-5%, Anti-aging agent: 1-4%; (3) Mixing of sheath material components: The styrene elastomer, white oil, polypropylene resin, high-efficiency halogen-free flame retardant, organosilicon compound and anti-aging agent prepared in step (2) are mixed and poured into a mixing pot and stirred evenly to obtain a mixed material; (4) Extrusion of mixed materials: The mixed material in step (3) is added into a twin-screw extruder for melting, conveying and extrusion at an extrusion temperature of 180°C to 200°C; (5) Cooling and granulation: The molten output extruded in step (4) is cooled to prepare pellets, which are halogen-free flame-retardant cable sheath materials for electric vehicles.

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