150 DEG C soft irradiation crosslinking halogen-free automobile cable material as well as preparation method and application thereof

Abstract

The invention provides a 150 DEG C soft irradiation crosslinking halogen-free automobile cable material as well as a preparation method and application thereof. The 150 DEG C soft irradiation crosslinking halogen-free automobile cable material comprises specific parts of an ethylene-vinyl acetate copolymer, polyethylene resin, a thermoplastic polyurethane elastomer, ethylene propylene diene monomer, aluminum hydroxide, a composite flame retardant, a lubricant, a composite stabilizer and a crosslinking agent. Through coordination and cooperation of the components, the 150 DEG C flexible irradiation crosslinking halogen-free automobile cable material has the characteristics of good high temperature resistance, good flexibility, high flame retardant grade, excellent aging resistance and the like, can simultaneously meet IS06722, ISO14572 and ISO19642 standard requirements, and is suitable for household charging pile cables and in-vehicle high-voltage cables.

Description

Technical Field

[0001] The invention belongs to the technical field of cable materials, and particularly relates to a 150°C soft radiation-crosslinked halogen-free automotive cable material, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of new energy vehicles, the use of new energy vehicle charging stations is increasing. Cables are used in the process of charging new energy vehicles using charging stations. As a power transmission medium, cables have a certain resistance value, so when transmitting power, they will generate a certain amount of heat. Therefore, it is necessary to conduct high temperature resistance testing on the cables produced to ensure their safety.

[0003] The current market commonly uses household charging pile cable materials with temperature resistance ratings of 105°C and 125°C. For example, CN107298825A discloses a high-temperature, oil-resistant, and scratch-resistant TPE new energy vehicle charging pile cable material and its preparation method. The resulting cable material has the advantages of being halogen-free and environmentally friendly, having excellent flame retardancy, withstanding a temperature rating of 125°C, good corrosion resistance to chemical liquids (gasoline, diesel, mineral oil, etc.), excellent surface scratch resistance, and being extremely easy to process. It can be widely used in new energy electric vehicle charging pile cable products.

[0004] However, with the increase in charging power, the temperature resistance requirements for charging pile cable materials are becoming higher and higher. At the same time, charging pile cables may often be bent and dragged during use, which will inevitably cause scratches, wear, crushing and other damage to the cables. In addition, the cables are mostly used outdoors, so there are higher requirements for the softness, high temperature resistance, aging resistance and flame retardancy of the cable materials. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the object of the present invention is to provide a 150°C soft radiation cross-linked halogen-free automotive cable material and its preparation method and application. The 150°C soft radiation cross-linked halogen-free automotive cable material has the characteristics of good high temperature resistance, good flexibility, high flame retardancy and excellent aging resistance, and can simultaneously meet the requirements of ISO6722, ISO14572 and ISO19642 standards.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a 150°C soft radiation cross-linked halogen-free automotive cable material, wherein the 150°C soft radiation cross-linked halogen-free automotive cable material comprises the following components in parts by weight:

[0008]

[0009] The 150°C soft radiation cross-linked halogen-free automotive cable material provided by the present invention uses ethylene-vinyl acetate copolymer (EVA resin) as a matrix. The EVA resin has good flexibility and heat resistance, and can enhance the thermal stability and deformation resistance of the material at high temperatures. Thermoplastic polyurethane elastomer (TPU) and ethylene propylene diene monomer (EPDM) are added as toughening agents. The combination of the two can effectively improve the softness of the material, reduce the hardness of the material, and also help to improve the tear strength of the material. Polyethylene resin (PE resin) is added, and the PE resin can be used as a compatibilizer to promote the EVA resin. The compatibility between grease, TPU and EPDM makes the combination of the three closer, further improving the high temperature resistance and softness of the material. The further addition of composite flame retardant and aluminum hydroxide plays a flame retardant role, effectively improving the flame retardancy of the material. Finally, the addition of lubricant, cross-linking agent and composite stabilizer can also make the material have excellent resistance to air aging. Finally, the radiation cross-linked halogen-free automotive cable material with high flame retardancy, good softness, wear resistance, tear resistance and excellent aging resistance is obtained, and it can meet the requirements of IS06722, ISO14572 and ISO19642 standards.

[0010] Wherein, the amount of the ethylene-vinyl acetate copolymer can be 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight or 35 parts by weight, etc.

[0011] The amount of the polyethylene resin can be 2 parts by weight, 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight or 5 parts by weight, etc.

[0012] The amount of the thermoplastic polyurethane elastomer can be 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight or 15 parts by weight, etc.

[0013] The amount of the EPDM rubber can be 5 parts by weight, 7 parts by weight, 9 parts by weight, 11 parts by weight, 13 parts by weight, 15 parts by weight, 17 parts by weight, 19 parts by weight or 20 parts by weight.

[0014] The amount of the aluminum hydroxide can be 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight or 45 parts by weight, etc.

[0015] The amount of the composite flame retardant can be 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight or 5 parts by weight, etc.

[0016] The amount of the lubricant can be 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight or 5 parts by weight, etc.

[0017] The amount of the composite stabilizer can be 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight or 5 parts by weight, etc.

[0018] The amount of the cross-linking agent can be 0.5 parts by weight, 0.7 parts by weight, 0.9 parts by weight, 1.1 parts by weight, 1.3 parts by weight, 1.5 parts by weight, 1.7 parts by weight, 1.9 parts by weight or 2 parts by weight, etc.

[0019] Preferably, the mass percentage of the vinyl acetate structure in the ethylene-vinyl acetate copolymer is 20-30%, for example, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%.

[0020] Preferably, the polyethylene resin is a high-density polyethylene resin.

[0021] Preferably, the composite flame retardant comprises aluminum hypophosphite and melamine cyanurate.

[0022] Preferably, the mass ratio of the aluminum hypophosphite to melamine cyanurate is 1:(0.5-1.5), for example, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4 or 1:1.5, etc.

[0023] Preferably, the lubricant includes any one of polyethylene wax, microcrystalline wax, zinc stearate or silicone masterbatch, or a combination of at least two thereof.

[0024] Preferably, the composite stabilizer includes antioxidant 405 and antioxidant 1076.

[0025] Preferably, the mass ratio of the antioxidant 405 to the antioxidant 1076 is 1:(0.1-0.5), for example, 1:0.1, 1:0.15, 1:0.2, 1:0.25, 1:0.3, 1:0.35, 1:0.4, 1:0.45 or 1:0.5, etc.

[0026] Preferably, the cross-linking agent includes any one of triallyl hydroxyurate, trimethylolpropane trimethacrylate, or triallyl isocyanurate, or a combination of at least two thereof.

[0027] In a second aspect, the present invention provides a method for preparing the 150°C flexible radiation-crosslinked halogen-free automotive cable material as described in the first aspect, the preparation method comprising the following steps:

[0028] (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, thermoplastic polyurethane elastomer, ethylene propylene diene monomer rubber, aluminum hydroxide, a composite flame retardant, a lubricant, a composite stabilizer and a cross-linking agent to obtain a mixture;

[0029] (2) melt-blending the mixture obtained in step (1) through an internal mixer, and then forming pellets through a single-screw extruder;

[0030] (3) The particles obtained in step (2) are made into wires through a wire extruder, and the wires are irradiated and cross-linked by an electron accelerator to obtain the 150° C. soft irradiation-crosslinked halogen-free automotive cable material.

[0031] Preferably, the mixing temperature in step (1) is 40-50°C, for example, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C.

[0032] Preferably, the mixing time in step (1) is 10 to 60 s, for example, 10 s, 15 s, 20 s, 25 s, 30 s, 35 s, 40 s, 45 s, 50 s, 55 s or 60 s.

[0033] Preferably, the temperature of the melt blending in step (2) is 160-175°C, for example, 160°C, 162°C, 164°C, 166°C, 167°C, 170°C, 172°C, 174°C or 175°C.

[0034] Preferably, the melt blending time in step (2) is 15 to 25 minutes, for example, 15 minutes, 17 minutes, 19 minutes, 21 minutes, 23 minutes or 25 minutes.

[0035] Preferably, the single-screw extruder in step (2) comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone connected in sequence, and the components melt-blended by the internal mixer pass through each zone in sequence, wherein the operating temperature of the first zone is 110-115°C (for example, 110°C, 111°C, 112°C, 113°C, 114°C or 115°C, etc.), the operating temperature of the second zone is 115-120°C (for example, 115°C, 116°C, 117°C, 118°C, 119°C or 120°C, etc.), and the operating temperature of the third zone is 115-120°C (for example, 115°C, 116°C, 117°C, 118°C, 119°C or 120°C, etc.). The operating temperature of the fourth zone is 120-125°C (for example, 120°C, 121°C, 122°C, 123°C, 124°C or 125°C, etc.), the operating temperature of the fifth zone is 120-125°C (for example, 120°C, 121°C, 122°C, 123°C, 124°C or 125°C, etc.), the operating temperature of the sixth zone is 120-130°C (for example, 120°C, 122°C, 124°C, 126°C, 128°C or 130°C, etc.), and the operating temperature of the seventh zone is 125-130°C (for example, 125°C, 126°C, 127°C, 128°C, 129°C or 130°C, etc.).

[0036] Preferably, the wire extruder in step (3) comprises a zone A, a zone B, a zone C and a zone D connected in sequence, so that the particles can pass through the zones A, B, C and D in sequence, wherein the operating temperature of the zone A is 130-140°C (e.g., 130°C, 132°C, 134°C, 136°C, 138°C or 140°C), the operating temperature of the zone B is 165-175°C (e.g., 165°C, 167°C, 169°C, 171°C, 173°C or 175℃, etc.), the operating temperature of zone C is 175-185℃ (for example, 175℃, 177℃, 179℃, 181℃, 183℃ or 185℃, etc.), the operating temperature of zone D is 180-190℃ (for example, 180℃, 182℃, 184℃, 186℃, 188℃ or 190℃, etc.), and the temperature of the head is 185-195℃ (for example, 185℃, 187℃, 189℃, 191℃, 193℃ or 195℃, etc.).

[0037] In a third aspect, the present invention provides an application of the 150°C soft radiation cross-linked halogen-free automotive cable material as described in the first aspect in household charging pile cables or in-vehicle high-voltage cables.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The 150°C soft radiation-crosslinked halogen-free automotive cable material provided by the present invention comprises specific proportions of ethylene-vinyl acetate copolymer, polyethylene resin, thermoplastic polyurethane elastomer, ethylene propylene diene monomer rubber, aluminum hydroxide, composite flame retardant, lubricant, composite stabilizer and crosslinking agent; through the coordinated cooperation of the above-mentioned components, the obtained 150°C soft radiation-crosslinked halogen-free automotive cable material has the characteristics of good high temperature resistance, good softness, high flame retardancy and excellent aging resistance, and can simultaneously meet the requirements of ISO6722, ISO14572 and ISO19642 standards, and is suitable for use in household charging pile cables. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0041] The detailed information of some raw materials involved in the following specific implementation is shown in Table 1:

[0042] Table 1

[0043]

[0044]

[0045] Example 1

[0046] A 150°C soft radiation-crosslinked halogen-free automotive cable material, comprising the following components in parts by weight:

[0047]

[0048] The preparation method of the 150°C flexible radiation cross-linked halogen-free automotive cable material provided in this embodiment comprises the following steps:

[0049] (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, thermoplastic polyurethane elastomer, ethylene propylene diene monomer rubber, aluminum hydroxide, aluminum hypophosphite, melamine cyanurate, polyethylene wax, antioxidant 405, antioxidant 1076, and triallyl hydroxyurate at 45° C. for 50 seconds to obtain a mixture;

[0050] (2) the mixture obtained in step (1) is melt-blended at 170° C. for 20 min by an internal mixer, and then formed into pellets by a single-screw extruder, wherein the single-screw extruder comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone connected in sequence, and the components melt-blended by the internal mixer pass through each zone in sequence, wherein the working temperature of the first zone is 112° C., the working temperature of the second zone is 118° C., the working temperature of the third zone is 118° C., the working temperature of the fourth zone is 125° C., the working temperature of the fifth zone is 125° C., the working temperature of the sixth zone is 130° C., and the working temperature of the seventh zone is 130° C.;

[0051] (3) The particles obtained in step (2) are made into wires through a wire extruder, and the wires are irradiated and cross-linked by an electron accelerator, wherein the wire extruder comprises a zone A, a zone B, a zone C and a zone D connected in sequence, so that the particles can pass through the zones A, B, C and D in sequence, wherein the working temperature of the zone A is 135°C, the working temperature of the zone B is 170°C, the working temperature of the zone C is 180°C, the working temperature of the zone D is 185°C, and the temperature of the die head is 190°C, thereby obtaining the 150°C soft radiation cross-linked halogen-free automotive cable material.

[0052] Example 2

[0053] A 150°C soft radiation-crosslinked halogen-free automotive cable material, comprising the following components in parts by weight:

[0054]

[0055]

[0056] The preparation method of the 150°C flexible radiation cross-linked halogen-free automotive cable material provided in this embodiment comprises the following steps:

[0057] (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, thermoplastic polyurethane elastomer, ethylene propylene diene monomer rubber, aluminum hydroxide, aluminum hypophosphite, melamine cyanurate, polyethylene wax, antioxidant 405, antioxidant 1076, and trimethylolpropane trimethacrylate at 40° C. for 60 seconds to obtain a mixture;

[0058] (2) the mixture obtained in step (1) is melt-blended at 175° C. for 15 min by an internal mixer, and then formed into pellets by a single-screw extruder, wherein the single-screw extruder comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone connected in sequence, and the components melt-blended by the internal mixer pass through each zone in sequence, wherein the working temperature of the first zone is 110° C., the working temperature of the second zone is 115° C., the working temperature of the third zone is 115° C., the working temperature of the fourth zone is 120° C., the working temperature of the fifth zone is 120° C., the working temperature of the sixth zone is 125° C., and the working temperature of the seventh zone is 130° C.;

[0059] (3) The particles obtained in step (2) are made into wires through a wire extruder, and the wires are irradiated and cross-linked by an electron accelerator, wherein the wire extruder comprises a zone A, a zone B, a zone C and a zone D connected in sequence, so that the particles can pass through the zones A, B, C and D in sequence, wherein the working temperature of the zone A is 130°C, the working temperature of the zone B is 165°C, the working temperature of the zone C is 175°C, the working temperature of the zone D is 180°C, and the temperature of the die head is 185°C, thereby obtaining the 150°C soft radiation cross-linked halogen-free automotive cable material.

[0060] Example 3

[0061] A 150°C soft radiation-crosslinked halogen-free automotive cable material, comprising the following components in parts by weight:

[0062]

[0063]

[0064] The preparation method of the 150°C flexible radiation cross-linked halogen-free automotive cable material provided in this embodiment comprises the following steps:

[0065] (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, thermoplastic polyurethane elastomer, ethylene propylene diene monomer rubber, aluminum hydroxide, aluminum hypophosphite, melamine cyanurate, polyethylene wax, antioxidant 405, antioxidant 1076, and trimethylolpropane trimethacrylate at 50° C. for 20 seconds to obtain a mixture;

[0066] (2) the mixture obtained in step (1) is melt-blended at 160° C. for 25 min by an internal mixer, and then formed into pellets by a single-screw extruder, wherein the single-screw extruder comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone connected in sequence, and the components melt-blended by the internal mixer pass through each zone in sequence, wherein the working temperature of the first zone is 115° C., the working temperature of the second zone is 120° C., the working temperature of the third zone is 120° C., the working temperature of the fourth zone is 125° C., the working temperature of the fifth zone is 125° C., the working temperature of the sixth zone is 130° C., and the working temperature of the seventh zone is 130° C.;

[0067] (3) The particles obtained in step (2) are made into wires through a wire extruder, and the wires are irradiated and cross-linked by an electron accelerator, wherein the wire extruder comprises a zone A, a zone B, a zone C and a zone D connected in sequence, so that the particles can pass through the zones A, B, C and D in sequence, wherein the working temperature of the zone A is 140°C, the working temperature of the zone B is 175°C, the working temperature of the zone C is 185°C, the working temperature of the zone D is 190°C, and the temperature of the die head is 195°C, thereby obtaining the 150°C soft radiation cross-linked halogen-free automotive cable material.

[0068] Example 4

[0069] A 150°C soft radiation-crosslinked halogen-free automotive cable material is provided. The difference between the material and Example 1 is that the amount of aluminum hypophosphite is 3 parts by weight, and the amount of melamine cyanurate is 1 part by weight. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0070] Example 5

[0071] A 150°C soft radiation-crosslinked halogen-free automotive cable material is provided. The difference between the material and Example 1 is that the amount of melamine cyanurate is 3 parts by weight, and the amount of aluminum hypophosphite is 1 part by weight. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0072] Example 6

[0073] A 150°C soft radiation-crosslinked halogen-free automotive cable material is provided. The difference between the material and Example 1 is that the amount of antioxidant 405 is 3.8 parts by weight, and the amount of antioxidant 1076 is 0.2 parts by weight. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0074] Example 7

[0075] A 150°C soft radiation-crosslinked halogen-free automotive cable material is provided. The difference between the material and Example 1 is that the amount of antioxidant 405 is 2 parts by weight, and the amount of antioxidant 1076 is 2 parts by weight. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0076] Comparative Example 1

[0077] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The only difference between the material and Example 1 is that no polyethylene resin is added. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0078] Comparative Example 2

[0079] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The material differs from Example 1 only in that no thermoplastic polyurethane elastomer is added and the amount of EPDM rubber added is 25 parts by weight. Other substances, amounts used, and preparation methods are the same as those in Example 1.

[0080] Comparative Example 3

[0081] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The material differs from Example 1 only in that no EPDM rubber is added and the amount of thermoplastic polyurethane elastomer added is 25 parts by weight. Other substances, amounts used, and preparation methods are the same as those in Example 1.

[0082] Comparative Example 4

[0083] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The material differs from Example 1 only in that aluminum hypophosphite is not added and the amount of melamine cyanurate added is 4 parts by weight. Other substances, amounts used, and preparation methods are the same as those in Example 1.

[0084] Comparative Example 5

[0085] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The material differs from Example 1 only in that melamine cyanurate is not added and the amount of aluminum hypophosphite added is 4 parts by weight. Other substances, amounts used, and preparation methods are the same as those in Example 1.

[0086] Comparative Example 6

[0087] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The only difference between the material and Example 1 is that aluminum hydroxide is not added. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0088] Comparative Example 7

[0089] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The material differs from Example 1 only in that antioxidant 1076 is not added and the amount of antioxidant 405 added is 4 parts by weight. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0090] Comparative Example 8

[0091] A 150°C soft radiation-crosslinked halogen-free automotive cable material is disclosed. The material differs from Example 1 only in that antioxidant 405 is not added and the amount of antioxidant 1076 added is 4 parts by weight. Other substances, amounts, and preparation methods are the same as those in Example 1.

[0092] Performance testing:

[0093] (1) Shore hardness: Tested in accordance with the method provided in GB / T 2411-2008.

[0094] (2) Temperature resistance grade: Tested in accordance with the method provided in GB / T 32029-2015.

[0095] (3) Flame retardant performance: Tested according to the method provided in UL 94-2023 standard.

[0096] (3) Air aging performance: The test was conducted in accordance with the method provided in GB / T 2951-2008. The test conditions were air box aging at 180°C for 7 days.

[0097] The irradiated cross-linked automotive cable material was tested according to the above test method. The test results are shown in Table 2:

[0098] Table 2

[0099]

[0100] According to the data in Table 2, we can see that:

[0101] The 150°C soft radiation-crosslinked halogen-free automotive cable materials provided in Examples 1 to 3 have a Shore hardness of 75 to 76A, a temperature resistance of up to 150°C, a flame retardancy of V-0, and a tensile strength change rate of +9.2 to +12.7% and an elongation at break change rate of -8.9 to -11.3% after 7 days of air heat aging at 180°C. They have excellent softness, high temperature resistance, flame retardancy, and air aging resistance, and meet the requirements of ISO6722, ISO14572, and ISO19642 standards.

[0102] Comparing the data of Example 1 and Comparative Examples 1 to 9, it can be seen that the Shore hardness, temperature resistance grade, flame retardancy, and air aging performance of the automotive cable material without the addition of polyethylene resin (Comparative Example 1) are all reduced; the absence of thermoplastic polyurethane elastomer (Comparative Example 2) or EPDM rubber (Comparative Example 3) will result in an increase in the Shore hardness of the obtained automotive cable material and a decrease in softness; the absence of aluminum hypophosphite (Comparative Example 4), melamine cyanurate (Comparative Example 5), or aluminum hydroxide (Comparative Example 6) will result in a decrease in the temperature resistance grade and flame retardancy of the obtained automotive cable material; the absence of antioxidant 1076 (Comparative Example 7) or antioxidant 405 (Comparative Example 8) will result in a decrease in the air aging performance of the obtained automotive cable material.

[0103] Comparing the data of Example 1 and Examples 4 to 7, it can be seen that the mass ratio of aluminum hypophosphite and melamine cyanurate is not within the preferred range defined in the present invention (Comparative Examples 4 to 5), which will also have an adverse effect on the flame retardant properties of the obtained automotive cable material; and the mass ratio of antioxidant 405 to antioxidant 1076 is not within the preferred range defined in the present invention (Comparative Examples 6 to 8), which will have an adverse effect on the air aging properties of the obtained automotive cable material.

[0104] The applicant states that while the present invention uses the aforementioned embodiments to illustrate a 150°C flexible, radiation-crosslinked, halogen-free automotive cable material, its preparation method, and its application, the present invention is not limited to these embodiments. This does not necessarily mean that the present invention must rely on these embodiments for implementation. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for various raw materials in the present invention, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A 150°C soft radiation cross-linked halogen-free automotive cable material, characterized in that: The 150°C soft radiation cross-linked halogen-free automotive cable material comprises the following components in parts by weight:

2. The 150°C soft radiation cross-linked halogen-free automotive cable material according to claim 1, characterized in that: The mass percentage of the vinyl acetate structure in the ethylene-vinyl acetate copolymer is 20-30%.

3. The 150°C flexible radiation cross-linked halogen-free automotive cable material according to claim 1 or 2, characterized in that: The polyethylene resin is a metallocene polyethylene resin.

4. The 150°C flexible radiation cross-linked halogen-free automotive cable material according to any one of claims 1 to 3, characterized in that: The composite flame retardant includes aluminum hypophosphite and melamine cyanurate; Preferably, the mass ratio of the aluminum hypophosphite to melamine cyanurate is 1:(0.5-1.5).

5. The 150°C flexible radiation cross-linked halogen-free automotive cable material according to any one of claims 1 to 4, characterized in that: The lubricant includes any one of polyethylene wax, microcrystalline wax, zinc stearate or silicone masterbatch, or a combination of at least two of them.

6. The 150°C flexible radiation cross-linked halogen-free automotive cable material according to any one of claims 1 to 5, characterized in that: The composite stabilizer includes antioxidant 405 and antioxidant 1076; Preferably, the mass ratio of the antioxidant 405 to the antioxidant 1076 is 1:(0.1-0.5).

7. The 150°C flexible radiation cross-linked halogen-free automotive cable material according to any one of claims 1 to 6, characterized in that: The cross-linking agent includes any one of triallyl hydroxyurate, trimethylolpropane trimethacrylate, or triallyl isocyanurate, or a combination of at least two thereof.

8. A method for preparing the 150°C flexible radiation cross-linked halogen-free automotive cable material according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: (1) mixing ethylene-vinyl acetate copolymer, polyethylene resin, thermoplastic polyurethane elastomer, ethylene propylene diene monomer rubber, aluminum hydroxide, a composite flame retardant, a lubricant, a composite stabilizer and a cross-linking agent to obtain a mixture; (2) melt-blending the mixture obtained in step (1) through an internal mixer, and then forming pellets through a single-screw extruder; (3) The particles obtained in step (2) are made into wires through a wire extruder, and the wires are irradiated and cross-linked by an electron accelerator to obtain the 150° C. soft irradiation-crosslinked halogen-free automotive cable material.

9. The preparation method according to claim 8, characterized in that The mixing temperature in step (1) is 40-50° C. and the mixing time is 10-60 seconds; Preferably, the temperature of the melt blending in step (2) is 160-175° C., and the time is 15-25 min; Preferably, the single-screw extruder in step (2) comprises a first zone, a second zone, a third zone, a fourth zone, a fifth zone, a sixth zone and a seventh zone connected in sequence, and the components melt-blended by the internal mixer pass through each zone in sequence, wherein the working temperature of the first zone is 110-115°C, the working temperature of the second zone is 115-120°C, the working temperature of the third zone is 115-120°C, the working temperature of the fourth zone is 120-125°C, the working temperature of the fifth zone is 120-125°C, the working temperature of the sixth zone is 120-130°C, and the working temperature of the seventh zone is 125-130°C; Preferably, the wire extruder in step (3) includes zone A, zone B, zone C and zone D connected in sequence, so that the particles can pass through zone A, zone B, zone C and zone D in sequence, wherein the working temperature of zone A is 130-140°C, the working temperature of zone B is 165-175°C, the working temperature of zone C is 175-185°C, the working temperature of zone D is 180-190°C, and the temperature of the head is 185-195°C.

10. Use of the 150°C flexible radiation-crosslinked halogen-free automotive cable material according to any one of claims 1 to 7 in household charging pile cables or in-vehicle high-voltage cables.

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