A high-voltage cable material for electric vehicles and a preparation method and application thereof

Abstract

The application provides a high-voltage cable material for electric vehicles, and raw materials for preparing the high-voltage cable material include methyl vinyl silicone rubber, phenylene ether silicone rubber, nano carbon fiber, heat-conducting filler, flame retardant and auxiliary agent. The high-voltage cable material for electric vehicles is prepared by compounding methyl vinyl silicone rubber, phenylene ether silicone rubber, nano carbon fiber, heat-conducting filler and flame retardant, so that the obtained high-voltage cable material has the characteristics of good temperature resistance, good flexibility, good heat conductivity and good flame retardance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cable materials, and particularly relates to a high-voltage cable material for electric vehicles and a preparation method and application thereof. BACKGROUND

[0002] Compared with traditional fuel vehicles, electric vehicles have many high-voltage accessories, such as power batteries, high-voltage distribution boxes, drive motors, motor controllers and the like, which puts forward new requirements for vehicle cables. The cables are usually arranged in the engine and chassis area of the front cabin, and have the characteristics of high temperature, multiple bending, large wire diameter and large heat generation. Therefore, the cable material must have good flexibility, flame retardance, thermal conductivity, thermal stability, high and low temperature resistance, excellent bending resistance and tear resistance and the like. At present, the power cable materials for vehicles include crosslinked polyolefins, thermoplastic elastomers and silicone rubbers.

[0003] CN114763424A discloses a crosslinked polyolefin compound and a preparation method, and an automobile cable using the compound, the crosslinked polyolefin compound includes the following raw material components in parts by weight: nitrile rubber 5-20 parts, ethylene-acrylic ester copolymer 10-25 parts, polyethylene 5-20 parts, polyolefin block copolymer 2-15 parts, ethylene-propylene-diene rubber 2-15 parts, crosslinking aid 3-5 parts, compatibilizer 2-10 parts, composite antioxidant 0.5-4 parts, dispersing agent 0.5-2 parts. The automobile cable prepared from the crosslinked polyolefin compound provided by the technical solution can guarantee good processing performance and elasticity, and also significantly improves the flexibility, precipitation resistance and aging resistance of the cable, and the mechanical property retention rate is good after aging at 180℃ for 168h.

[0004] CN109825075A discloses a halogen-free flame-retardant thermoplastic elastomer cable material for new energy vehicles, the halogen-free flame-retardant thermoplastic elastomer cable material for new energy vehicles includes the following raw materials in parts by weight: thermoplastic elastomer 25-45 parts, polyolefin 10-40 parts, polyphenyl ether 5-25 parts, halogen-free flame retardant 0.1-5 parts, compatibilizer 1-5 parts, antioxidant 0.1-5 parts, filling oil 5-10 parts. The cable material provided by the technical solution has the performances of environmental protection safety, flame retardance, fire prevention, low smoke and aging resistance.

[0005] CN109423052A discloses a kind of new energy automobile high voltage line with silane crosslinking elastomer cable material and preparation method thereof, the silane crosslinking elastomer cable material is made of the following components by weight parts: silicone rubber 15-35 parts, ethylene-methyl acrylate 10-35 parts, polyphosphazene 10-25 parts, catalyst masterbatch 10~30 parts, polyolefin 10-20 parts, polyether ether ketone 2-10 parts, phosphorus-nitrogen flame retardant 10~40 parts, silicon flame-retardant synergist 2-10 parts, vinyl trimethoxysilane 0.1-1 part, diisopropylbenzene peroxide 1-10 parts, antioxidant 0.1-2 parts;Wherein the catalyst masterbatch is made of the following components by weight parts: linear low density polyethylene, di-n-butyltin dilaurate, triethylamine, siloxane, silicon dioxide, antioxidant.The technical scheme provided by the silane crosslinking elastomer cable material reaches temperature resistance grade 150 DEG C, and the mechanical property retention rate is above 80% after aging 180 DEG C x 7 days.

[0006] Although the above-mentioned materials have obtained excellent cable materials, but in order to meet the demand of electric vehicle high voltage cable, the temperature resistance, flame retardance and thermal conductivity of cable material still need to be improved.

[0007] Therefore, it is necessary to develop a kind of electric vehicle high voltage cable material with good temperature resistance, good flexibility, good thermal conductivity and good flame retardance. SUMMARY

[0008] In view of the deficiencies of the prior art, the purpose of the present application is to provide a kind of electric vehicle high voltage cable material and its preparation method and application.The electric vehicle high voltage cable material is prepared by compounding methyl vinyl silicone rubber, phenyl ether siloxane, nano carbon fiber, heat-conducting filler, flame retardant and auxiliary agent, so that the obtained high voltage cable material has the characteristics of good temperature resistance, good flexibility, good thermal conductivity and good flame retardance.

[0009] To achieve this purpose, the present application adopts the following technical solutions:

[0010] In the first aspect, the present application provides a kind of electric vehicle high voltage cable material, and the preparation raw material of the electric vehicle high voltage cable material includes methyl vinyl silicone rubber, phenyl ether siloxane, nano carbon fiber, heat-conducting filler, flame retardant and auxiliary agent.

[0011] In the application, the high-voltage cable material adopts two kinds of organic silicon rubber compounds as the matrix, the organic silicon rubber has a main chain structure of Si-O bond, and the side chain is connected with various organic groups through silicon atoms. The bond energy of Si-O bond in organic silicon is much larger than that of C-C bond, has high thermal stability, chemical bond is not easy to break and decompose, has good weather resistance, can withstand high temperature and low temperature, and can be used in a wide temperature range, and has good insulation performance, the breakdown voltage is above 20KV / mm, which can help the cable to maintain good insulation and stability. The side chain of the methyl vinyl silicone rubber has a vinyl group, the crosslinking activity is improved, and the processing performance is good; the molecular main chain of the phenyl ether silicone rubber has a phenyl ether group and a benzene group, and has good mechanical properties and temperature resistance; the two kinds of organic silicon rubber compounds improve the temperature resistance and mechanical properties; the addition of nano carbon fibers improves the temperature resistance and thermal conductivity, and the combination of nano carbon fibers and thermal conductive fillers further improves the thermal conductivity of the high-voltage cable material.

[0012] Preferably, the preparation raw materials of the high-voltage cable material for electric vehicles include the following components by weight fraction:

[0013]

[0014] The mass fraction of the methyl vinyl silicone rubber can be 40 parts, 42 parts, 45 parts, 46 parts, 48 parts, 50 parts, 52 parts, 55 parts, 57 parts, 59 parts or 60 parts, etc.

[0015] The mass fraction of the methyl vinyl silicone rubber can be 40 parts, 42 parts, 45 parts, 46 parts, 48 parts, 50 parts, 52 parts, 55 parts, 57 parts, 59 parts or 60 parts, etc.

[0016] The mass fraction of the nano carbon fiber can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3 parts, etc.

[0017] The mass fraction of the thermal conductive filler can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc.

[0018] The mass fraction of the flame retardant can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts, etc.

[0019] The mass fraction of the auxiliary agent can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc.

[0020] Preferably, the nanocarbon fiber has a diameter of 150-200 nm (e.g., 150 nm, 155 nm, 160 nm, 165 nm, 170 nm, 175 nm, 180 nm, 185 nm, 190 nm, or 200 nm, etc.) and a length of 10-50 μm (e.g., 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, or 50 μm, etc.).

[0021] Preferably, the thermally conductive filler comprises boron nitride and aluminum oxide.

[0022] Preferably, the boron nitride has a particle size of 1-5 μm (e.g., 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or 5 μm, etc.).

[0023] Preferably, the aluminum oxide has a particle size of 0.05-1 μm (e.g., 0.05 μm, 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.8 μm, or 1 μm, etc.).

[0024] Preferably, the mass ratio of the boron nitride to the aluminum oxide is 0.5-3:1 (e.g., 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1, 2:1, 2.2:1, 2.5:1, 2.8:1, or 3:1, etc.).

[0025] In the present application, the use of boron nitride and aluminum oxide as the thermally conductive filler helps to further improve the thermal conductivity.

[0026] Preferably, the flame retardant comprises an organic flame retardant and an inorganic flame retardant.

[0027] Preferably, the inorganic flame retardant comprises aluminum hydroxide, magnesium hydroxide, or diantimony trioxide.

[0028] Preferably, the organic flame retardant comprises ammonium polyphosphate and melamine cyanurate.

[0029] Preferably, the mass ratio of the inorganic flame retardant to the organic flame retardant is 5-10:1 (e.g., 5:1, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, or 10:1, etc.), and the mass ratio of the ammonium polyphosphate to the melamine cyanurate is 2-4:1 (e.g., 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, 3.2:1, 3.5:1, 3.8:1, or 4:1, etc.).

[0030] In the present application, the inorganic flame retardant and the organic flame retardant are used in combination, which can produce good flame retardant effect with less addition amount of flame retardant. In the combustion process, ammonium polyphosphate and melamine cyanurate have synergy, accelerate the formation of polyphosphoric acid, and form a stable carbonized layer. The inorganic flame retardant has good flame retardant effect but large density, and is used alone with large addition amount. The combination with the organic flame retardant can obviously improve the flame retardant effect.

[0031] Preferably, the auxiliary agent includes any one or a combination of at least two of an antioxidant, a heat stabilizer, or silicone masterbatch.

[0032] Preferably, the auxiliary agent includes, by weight fraction, the following components: antioxidant 0.5-2 parts (for example, 0.5 parts, 0.7 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, or 2 parts, etc.), heat stabilizer 0.5-2 parts (for example, 0.5 parts, 0.7 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, or 2 parts, etc.), and silicone masterbatch 1-4 parts (for example, 1 part, 1.2 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc.).

[0033] Preferably, the antioxidant includes any one or a combination of at least two of 2,6-di-tert-butyl-4-methylphenol, bis(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide, or tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester.

[0034] Preferably, the heat stabilizer is any one or a combination of at least two of calcium stearate, barium stearate, or zinc stearate.

[0035] In a second aspect, the present application provides a preparation method of the high-voltage cable material for electric vehicles as described in the first aspect, and the preparation method comprises the following steps:

[0036] (1) mixing, extruding, and obtaining blended particles from methyl vinyl silicone rubber, phenylene ether silicone rubber, nano-carbon fiber, heat-conducting filler, flame retardant, and auxiliary agent.

[0037] (2) making the blended particles obtained in step (1) into a wire, and then irradiating and cross-linking the wire to obtain the high-heat-conducting silicone rubber cable material.

[0038] Preferably, the mixing method in step (1) is banburying.

[0039] Preferably, the temperature of the banburying is 120-130°C, for example, 120°C, 121°C, 122°C, 123°C, 124°C, 126°C, 127°C, 129°C, or 130°C, etc.

[0040] Preferably, the mixing time of step (1) is 15-25 min, such as 15 min, 18 min, 19 min, 20 min, 21 min, 22 min, 23 min, 24 min or 25 min, etc.

[0041] Preferably, the method of step (1) is single screw extruder extrusion.

[0042] Preferably, the temperature of feeding zone of the single screw extruder of step (1) is 100-110℃ (such as 100℃, 101℃, 102℃, 103℃, 104℃, 106℃, 107℃, 109℃ or 110℃, etc.), the temperature of conveying zone is 120-130℃ (such as 120℃, 121℃, 122℃, 123℃, 124℃, 126℃, 127℃, 129℃ or 130℃, etc.), the temperature of heating zone is 130-140℃ (such as 130℃, 131℃, 132℃, 133℃, 134℃, 136℃, 137℃, 139℃ or 140℃, etc.), and the temperature of die head is 135-145℃ (such as 135℃, 136℃, 138℃, 139℃, 140℃, 142℃, 143℃, 144℃ or 145℃, etc.).

[0043] Preferably, the wire extruder of step (2) is used to make the wire.

[0044] Preferably, the temperature of feeding zone of the wire extruder is 110-130℃ (such as 110℃, 112℃, 115℃, 117℃, 120℃, 122℃, 125℃, 127℃ or 130℃, etc.), the temperature of conveying zone is 165-175℃ (such as 165℃, 167℃, 168℃, 169℃, 170℃, 172℃, 173℃, 174℃ or 175℃, etc.), the temperature of heating zone is 170-190℃ (such as 170℃, 172℃, 175℃, 178℃, 180℃, 182℃, 185℃, 188℃ or 190℃, etc.), and the temperature of die head is 180-190℃ (such as 180℃, 182℃, 183℃, 184℃, 185℃, 186℃, 188℃, 189℃ or 190℃, etc.).

[0045] Preferably, the irradiation of step (2) is performed by electron accelerator, and the irradiation dose is 5-15 Mrad (such as 5 Mrad, 6 Mrad, 7 Mrad, 8 Mrad, 9 Mrad, 10 Mrad, 12 Mrad, 14 Mrad or 15 Mrad, etc.).

[0046] In a third aspect, the present application provides a use of the high-voltage cable material for electric vehicles according to the first aspect as cable wire insulation material.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] The methyl vinyl silicone rubber and the phenylene ether silicone rubber are used as the matrix, so that the high-voltage cable material has good flexibility, temperature resistance and mechanical properties; the methyl vinyl silicone rubber, the phenylene ether silicone rubber, the nano carbon fiber, the heat-conducting filler, the flame retardant and the additive are compounded, so that the high-voltage cable material has good heat conductivity, temperature resistance and flame retardation. DETAILED DESCRIPTION

[0049] The technical solutions of the present application are further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations on the present application.

[0050] The preparation raw material types and manufacturers of the following examples and comparative examples are as follows:

[0051] Methyl vinyl silicone rubber, DR-110-2S, purchased from Ningbo Daoruo Silicone Co., Ltd.

[0052] Phenylene ether silicone rubber, HY-602, purchased from Wuhan Huaren Fine Chemical

[0053] Silicone masterbatch, GT500, purchased from Zhejiang Jiahua Co., Ltd.

[0054] Ammonium polyphosphate, TY-1860, purchased from Zhengzhou Hengtong Chemical Co., Ltd.

[0055] Example 1

[0056] The present embodiment provides a high-voltage cable material for electric vehicles and a preparation method thereof. The preparation raw materials of the high-voltage cable material for electric vehicles include the following components in parts by weight: 50 parts of methyl vinyl silicone rubber (DR-110-2S), 20 parts of phenylene ether silicone rubber (HY-602), 2 parts of nano carbon fiber (diameter of 150 nm and length of 25 μm), 5 parts of heat-conducting filler (the heat-conducting filler is boron nitride and aluminum oxide with a mass ratio of 2:1, wherein the particle size of the boron nitride is 3 μm and the particle size of the aluminum oxide is 0.5 μm), 15 parts of flame retardant (the flame retardant is inorganic flame retardant and organic flame retardant with a mass ratio of 8:1, the inorganic flame retardant is aluminum hydroxide, and the organic flame retardant is ammonium polyphosphate and cyanuric acid melamine with a mass ratio of 3:1), and 5 parts of additive.

[0057] The additive is 1 part of antioxidant (2,6-di-tert-butyl-4-methylphenol), 2 parts of heat stabilizer (calcium stearate) and 2 parts of silicone masterbatch (GT500).

[0058] The preparation method includes the following steps:

[0059] (1) The methyl vinyl silicone rubber, phenylene ether silicone rubber, nanometer carbon fiber, heat-conducting filler, flame retardant and auxiliary agent are mixed at 160°C for 20 minutes, and then extruded through a single screw extruder, wherein the temperature of the feeding zone of the single screw extruder is 105°C, the temperature of the conveying zone is 125°C, the temperature of the heating zone is 135°C, and the temperature of the die head is 140°C, to obtain blended particles.

[0060] (2) The blended particles obtained in step (1) are added to a wire extruder, wherein the temperature of the feeding zone of the wire extruder is 120°C, the temperature of the conveying zone is 170°C, the temperature of the heating zone is 180°C, and the temperature of the die head is 185°C, to obtain a wire, which is then irradiated and crosslinked using an electron accelerator, and the irradiation dose is 10 Mrad, to obtain the high-voltage cable material for electric vehicles.

[0061] Example 2

[0062] The present embodiment provides a high-voltage cable material for electric vehicles and a preparation method thereof, and the raw materials for preparing the high-voltage cable material for electric vehicles include the following components in parts by weight: 40 parts of methyl vinyl silicone rubber (DR-110-2S), 25 parts of phenylene ether silicone rubber (HY-602), 3 parts of nanometer carbon fiber (diameter of 180 nm and length of 50 μm), 10 parts of heat-conducting filler (the heat-conducting filler is boron nitride and aluminum oxide in a mass ratio of 3:1, the particle size of the boron nitride is 5 μm, and the particle size of the aluminum oxide is 0.05 μm), 30 parts of flame retardant (the flame retardant is inorganic flame retardant and organic flame retardant in a mass ratio of 10:1, the inorganic flame retardant is magnesium hydroxide, and the organic flame retardant is ammonium polyphosphate and cyanuric acid melamine in a mass ratio of 4:1), and 4 parts of auxiliary agent.

[0063] The auxiliary agent is 0.5 parts of antioxidant (2,6-di-tert-butyl-4-methylphenol), 0.5 parts of thermal stabilizer (barium stearate) and 1 part of silicone master batch (GT500).

[0064] (1) The methyl vinyl silicone rubber, phenylene ether silicone rubber, nanometer carbon fiber, heat-conducting filler, flame retardant and auxiliary agent are mixed at 170°C for 15 minutes, and then extruded through a single screw extruder, wherein the temperature of the feeding zone of the single screw extruder is 100°C, the temperature of the conveying zone is 120°C, the temperature of the heating zone is 130°C, and the temperature of the die head is 135°C, to obtain blended particles.

[0065] (2) The blended particles obtained in step (1) are added to a wire extruder, wherein the temperature of the feeding zone of the wire extruder is 110°C, the temperature of the conveying zone is 165°C, the temperature of the heating zone is 170°C, and the temperature of the die head is 180°C, to obtain a wire, which is then irradiated and crosslinked using an electron accelerator, and the irradiation dose is 10 Mrad, to obtain the high-voltage cable material for electric vehicles.

[0066] Example 3

[0067] The embodiment provides a high-voltage cable material for electric vehicles and a preparation method thereof. The preparation raw material of the high-voltage cable material for electric vehicles comprises the following components in parts by weight: 60 parts of methyl vinyl silicone rubber (DR-110-2S), 15 parts of phenylene ether silicone rubber (HY-602), 3 parts of nano carbon fiber (diameter of 200 nm and length of 10 microns), 1 part of heat-conducting filler (the heat-conducting filler is boron nitride and aluminum oxide with a mass ratio of 0.5:1, the particle size of the boron nitride is 1 micron, and the particle size of the aluminum oxide is 1 micron), 30 parts of flame retardant (the flame retardant is inorganic flame retardant and organic flame retardant with a mass ratio of 5:1, the inorganic flame retardant is diantimony trioxide, and the organic flame retardant is ammonium polyphosphate and melamine cyanurate with a mass ratio of 2:1), and 1 part of auxiliary agent (silicone master batch, GT500).

[0068] The preparation method comprises the following steps

[0069] (1) mixing the methyl vinyl silicone rubber, the phenylene ether silicone rubber, the nano carbon fiber, the heat-conducting filler, the flame retardant and the auxiliary agent at 150 DEG C for 25 min, and then extruding through a single-screw extruder, wherein the feeding zone temperature of the single-screw extruder is 110 DEG C, the conveying zone temperature is 130 DEG C, the heating zone temperature is 140 DEG C, and the die head temperature is 145 DEG C, so as to obtain blended particles.

[0070] (2) adding the blended particles obtained in the step (1) into a wire extruder, wherein the feeding zone temperature of the wire extruder is 130 DEG C, the conveying zone temperature is 175 DEG C, the heating zone temperature is 190 DEG C, and the die head temperature is 190 DEG C, so as to obtain a wire, and then performing irradiation crosslinking on the wire by using an electron accelerator, wherein the irradiation dose is 15 Mrad, so as to obtain the high-voltage cable material for electric vehicles.

[0071] Example 4

[0072] The embodiment provides a high-voltage cable material for electric vehicles and a preparation method thereof, which are different from those in the embodiment 1 in that the mass fraction of the phenylene ether silicone rubber is 5 parts, and the other raw materials, the dosages and the preparation method are the same as those in the embodiment 1.

[0073] Example 5

[0074] The embodiment provides a high-voltage cable material for electric vehicles and a preparation method thereof, which are different from those in the embodiment 1 in that the mass fraction of the nano carbon fiber is 0.1 part, and the other raw materials, the dosages and the preparation method are the same as those in the embodiment 1.

[0075] Example 6

[0076] The embodiment provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that 5 parts of a heat-conducting filler (the heat-conducting filler is aluminum oxide with a particle size of 0.5 microns), and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0077] Embodiment 7

[0078] The embodiment provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that 5 parts of a heat-conducting filler (the heat-conducting filler is boron nitride with a particle size of 3 microns), and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0079] Embodiment 8

[0080] The embodiment provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that the mass ratio of the boron nitride and the aluminum oxide is 0.1:1, and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0081] Comparative Example 1

[0082] The comparative example provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that no phenylene ether silicone rubber is added, the addition amount of the methyl vinyl silicone rubber is 70 parts, and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0083] Comparative Example 2

[0084] The comparative example provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that no nano-carbon fiber is added, the weight fraction of the heat-conducting filler is 7 parts, and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0085] Comparative Example 3

[0086] The comparative example provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that no heat-conducting filler is added, the weight fraction of the nano-carbon fiber is 7 parts, and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0087] Comparative Example 4

[0088] The comparative example provides a high-voltage cable material for an electric vehicle and a preparation method thereof, which is different from the embodiment 1 in that no nano-carbon fiber and heat-conducting filler are added, and the other raw materials, the usage and the preparation method are the same as those in the embodiment 1.

[0089] Comparative Example 5

[0090] The comparative example 1 provides a high-voltage cable material for electric vehicles and a preparation method thereof, which is different from example 1 in that no flame retardant is added, and other raw materials, amounts and preparation methods are the same as those of example 1.

[0091] Performance test

[0092] (1) Single vertical combustion: tested according to GB / T18380-2008 "Combustion test of cables and optical cables under flame conditions".

[0093] (2) Tensile strength and elongation at break: tested according to the test method for tensile strength and elongation at break in GB / T2951 "General test methods for cable and optical cable insulation and sheath materials".

[0094] (3) Thermal conductivity: tested by using a thermal conductivity tester.

[0095] (4) Thermal aging performance: 180℃, 168h thermal aging test and 200℃, 168h thermal aging test were carried out, and the change rates of tensile strength and elongation at break were less than or equal to 15% to be considered as qualified, and the change rates of tensile strength and elongation at break were greater than 15% to be considered as unqualified.

[0096] The test results are shown in Table 1.

[0097] Table 1

[0098]

[0099] According to the test results in Table 1, the high-voltage cable material for electric vehicles provided by examples 1-3 has good mechanical properties, thermal conductivity, temperature resistance and flame retardancy, wherein the tensile strength of the high-voltage cable material for electric vehicles provided by examples 1-3 is ≥10.6MPa, the thermal conductivity is ≥1.9Wm -1 K -1 , the flame retardant effect is good, and it can withstand 200℃ thermal aging test, the high-voltage cable material for electric vehicles provided by examples 4 and 5 can withstand 180℃ thermal aging, but cannot withstand 200℃ thermal aging, and the thermal conductivity of the high-voltage cable material for electric vehicles provided by examples 5-8 is 1.3-1.7Wm -1 K -1 .

[0100] Compared with example 1, if phenyl ether siloxane rubber (comparative example 1) is not added, the tensile strength, thermal conductivity and temperature resistance all decrease.

[0101] Compared with example 1, if nano carbon fiber is not added (comparative example 2) and the amount of thermal conductive filler is 7 parts, the tensile strength, thermal conductivity and temperature resistance all decrease.

[0102] Compared with Example 1, if no heat conductive filler is added (Comparative Example 3) and the amount of nanometer carbon fiber is 7 parts, the thermal conductivity is greatly reduced.

[0103] Compared with Example 1, if no nanometer carbon fiber and heat conductive filler are added (Comparative Example 4), the tensile strength, thermal conductivity and temperature resistance are all reduced.

[0104] Compared with Example 1, if no flame retardant is added (Comparative Example 5), no flame retardant effect is obtained.

[0105] The applicant declares that the high-voltage cable material for electric vehicles, the preparation method and the application of the present application are illustrated by the above examples, but the present application is not limited to the above examples, that is, it does not mean that the present application must rely on the above examples to be implemented. Those skilled in the art should understand that any improvement of the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary ingredients, selection of specific methods, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A high voltage cable material for electric vehicles, characterized by The raw material for preparing the high-voltage cable material for electric vehicles comprises the following components in parts by weight: The heat-conducting filler comprises boron nitride and aluminum oxide. The mass ratio of the boron nitride and the aluminum oxide is (0.5-3):

1.

2. The high voltage cable material for electric vehicles according to claim 1, characterized by, The diameter of the nanometer carbon fiber is 150-200 nm, and the length is 10-50 μm.

3. The high voltage cable material for electric vehicles according to claim 1, characterized by, The particle size of the boron nitride is 1-5 μm.

4. The high voltage cable material for electric vehicles according to claim 1, characterized by, The particle size of the aluminum oxide is 0.05-1 μm.

5. The high voltage cable material for electric vehicles according to claim 1, characterized by, The flame retardant comprises an organic flame retardant and an inorganic flame retardant.

6. The high voltage cable material for electric vehicles according to claim 5, characterized by The inorganic flame retardant comprises aluminum hydroxide, magnesium hydroxide or diantimony trioxide.

7. The high voltage cable material for electric vehicles according to claim 5, characterized by The organic flame retardant comprises ammonium polyphosphate and / or melamine cyanurate.

8. The high voltage cable material for electric vehicles according to claim 7, characterized by The mass ratio of the inorganic flame retardant and the organic flame retardant is (5-10):1, and the mass ratio of the ammonium polyphosphate and the melamine cyanurate is (2-4):

1.

9. The high voltage cable material for electric vehicles according to claim 1, characterized by, The auxiliary agent comprises any one or a combination of at least two of an antioxidant, a heat stabilizer or silicone master batch.

10. The high voltage cable material for electric vehicles according to claim 1, characterized by, The auxiliary agent comprises the following components in parts by weight: the antioxidant 0.5-2 parts, the heat stabilizer 0.5-2 parts and the silicone master batch 1-4 parts.

11. The high voltage cable material for electric vehicles according to claim 10, characterized by The antioxidant comprises any one or a combination of at least two of 2,6-di-tert-butyl-4-methylphenol, bis(3,5-di-tert-butyl-4-hydroxyphenyl) sulfide or tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester.

12. The high voltage cable material for electric vehicles according to claim 10, characterized by The heat stabilizer is any one or a combination of at least two of calcium stearate, barium stearate or zinc stearate.

13. The method of producing a high voltage cable material for electric vehicles according to any one of claims 1 to 12, characterized in that, The preparation method comprises the following steps: (1) mixing, extruding, obtaining blended particles from methyl vinyl silicone rubber, phenylene ether silicone rubber, nanometer carbon fiber, heat-conducting filler, flame retardant and auxiliary agent; (2) making the blended particles obtained in step (1) into a wire, and then irradiating and cross-linking the wire to obtain the high-voltage cable material for electric vehicles.

14. The method of claim 13, wherein, The mixing method in step (1) is internal mixing.

15. The preparation method according to claim 14, characterized in that, The temperature of the internal mixing is 150-170 °C.

16. The method of claim 13, wherein, The mixing time in step (1) is 15-25 min.

17. The method of claim 13, wherein, The extruding method in step (1) is single-screw extruder extrusion.

18. The method of claim 17, wherein, The temperature of the single-screw extruder in step (1) is 100-110 °C in the feeding area, 120-130 °C in the conveying area, 130-140 °C in the heating area and 135-145 °C in the head.

19. The method of claim 13, wherein, The wire is made by a wire extruder in step (2).

20. The method of claim 19, wherein, The temperature of the wire extruder is 110-130 °C in the feeding area, 165-175 °C in the conveying area, 170-190 °C in the heating area and 180-190 °C in the head.

21. The method of claim 13, wherein, The irradiation in step (2) is performed by an electron accelerator, and the irradiation dose is 5-15 Mrad.

22. Application of the high-voltage cable material for electric vehicles according to any one of claims 1-12 as cable wire insulation material.

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