A cable material and its preparation method and application

Abstract

The present invention discloses a cable material and a preparation method and application thereof, belonging to the field of polymer materials. The cable material provided by the present invention comprises the following raw materials in parts by weight: 8 to 30 parts of ultra-high molecular weight polyethylene, 8 to 30 parts of nitrile rubber, 5 to 30 parts of ethylene propylene rubber, 3 to 30 parts of polypropylene, 5 to 20 parts of thermoplastic elastomer, 20 to 70 parts of flame retardant, 5 to 20 parts of antioxidant, 0.5 to 10 parts of smoke suppression carbonization agent, and 2 to 20 parts of auxiliary agent. The cable material provided by the present invention has excellent high temperature resistance, acid and alkali corrosion resistance and low smoke flame retardant performance, and the radiation-free preparation method provides a safer and more efficient solution for the fast-paced automotive industry, especially the new energy automotive industry.

Description

Technical Field

[0001] The invention belongs to the field of polymer materials, and in particular relates to a cable material and a preparation method and application thereof. Background Art

[0002] Driven by carbon neutrality and new energy technologies, new energy vehicles are booming in my country. Since cables for new energy vehicles are used in working environments such as batteries and motors, they need to have technical requirements such as resistance to long-term high temperatures, resistance to acid and alkali corrosion, and low smoke and flame retardancy, and have very high safety requirements. The technical characteristics of traditional automotive cables are relatively simple, and the material itself has certain defects in its long-term high temperature resistance, which cannot meet the needs of today's new energy vehicles.

[0003] The traditional cross-linking method of cables increases the production cost of cables and prolongs the delivery cycle, which is seriously lagging behind the fast-response automotive industry. Due to its advantages such as no need for additional cross-linking investment and fast delivery, radiation-free has been vigorously developed in the wire and cable industry in recent years. This technology has become a trend to be used in high-end cables. However, the long-term high temperature resistance, acid and alkali corrosion resistance and low smoke flame retardant performance of current radiation-free cable materials still need to be improved. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, one of the purposes of the present invention is to provide a cable material having excellent long-term high temperature resistance, acid and alkali corrosion resistance and low smoke flame retardant properties.

[0005] A second object of the present invention is to provide a method for preparing the above-mentioned cable material.

[0006] A third object of the present invention is to provide an application of the above-mentioned cable material and the preparation method thereof in the automotive field.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The first aspect of the present invention provides a cable material, which includes the following raw materials in parts by weight: 8 to 30 parts of ultra-high molecular weight polyethylene, 8 to 30 parts of nitrile rubber, 5 to 30 parts of ethylene propylene rubber, 3 to 30 parts of polypropylene, 5 to 20 parts of thermoplastic elastomer, 20 to 70 parts of flame retardant, 5 to 20 parts of antioxidant, 0.5 to 10 parts of smoke suppressant and carbonization agent, and 2 to 20 parts of auxiliary agent.

[0009] Preferably, in the cable material, the viscosity average molecular weight of the ultra-high molecular weight polyethylene is 1 million to 4 million; further preferably, in the cable material, the viscosity average molecular weight of the ultra-high molecular weight polyethylene is 1 million to 3 million; further preferably, in the cable material, the viscosity average molecular weight of the ultra-high molecular weight polyethylene is 1 million to 2 million.

[0010] Preferably, the tensile strength of the ultra-high molecular weight polyethylene in the cable material is 15 to 40 MPa; further preferably, the tensile strength of the ultra-high molecular weight polyethylene in the cable material is 18 to 35 MPa; further preferably, the tensile strength of the ultra-high molecular weight polyethylene in the cable material is 20 to 30 MPa. The tensile strength is measured by the GB / T 1040 method.

[0011] Preferably, in the cable material, the elongation at break of the ultra-high molecular weight polyethylene is 300-700%; further preferably, in the cable material, the elongation at break of the ultra-high molecular weight polyethylene is 350-600%; further preferably, in the cable material, the elongation at break of the ultra-high molecular weight polyethylene is 400-500%. The elongation at break is measured by the GB / T 1040 method.

[0012] Preferably, in the cable material, the acrylonitrile content of the nitrile rubber is 30-45wt%; further preferably, in the cable material, the acrylonitrile content of the nitrile rubber is 35-42wt%; further preferably, in the cable material, the acrylonitrile content of the nitrile rubber is 38-40wt%.

[0013] Preferably, in the cable material, the melting index of ethylene propylene rubber at 190°C and 2.16 kg is 3 to 10 g / 10 min; further preferably, in the cable material, the melting index of ethylene propylene rubber at 190°C and 2.16 kg is 5 to 8 g / 10 min; further preferably, in the cable material, the melting index of ethylene propylene rubber at 190°C and 2.16 kg is 6 to 7 g / 10 min.

[0014] Preferably, in the cable material, the antioxidant includes at least one of phenolic antioxidants, amine antioxidants, thioester antioxidants or phosphite antioxidants; further preferably, in the cable material, the antioxidant includes at least one of phenolic antioxidants, amine antioxidants or thioester antioxidants; even further preferably, in the cable material, the antioxidant includes phenolic antioxidants, amine antioxidants or a combination thereof.

[0015] Preferably, in the cable material, the antioxidant comprises phenolic antioxidants, amine antioxidants, thioester antioxidants and phosphite antioxidants in a mass ratio of 1: (0-2): (0-1): (0-1); further preferably, in the cable material, the antioxidant comprises phenolic antioxidants, amine antioxidants and thioester antioxidants in a mass ratio of 1: (0-2): (0-1); further preferably, in the cable material, the antioxidant comprises phenolic antioxidants and amine antioxidants in a mass ratio of 1: (0-2); more preferably, in the cable material, the antioxidant comprises phenolic antioxidants and amine antioxidants in a mass ratio of 1: (0.5-2); most preferably, in the cable material, the antioxidant comprises phenolic antioxidants and amine antioxidants in a mass ratio of 1: (0.5-1).

[0016] Preferably, among the antioxidants, the phenolic antioxidants include at least one of antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), antioxidant 300 (4,4'-thiobis(6-tert-butyl-3-methylphenol)), antioxidant 264 (2,6-di-tert-butyl-p-methylphenol) or antioxidant 1076 (β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate); further preferably, among the antioxidants, the phenolic antioxidants include at least one of antioxidant 1010, antioxidant 300 or antioxidant 264; further preferably, among the antioxidants, the phenolic antioxidants include antioxidant 1010, antioxidant 300 or a combination thereof.

[0017] Preferably, among the antioxidants, the amine antioxidants include at least one of antioxidant KY405 (diisopropylphenyl diphenylamine), antioxidant ODA (4,4'-dioctyl diphenylamine) or antioxidant 4010 (N-cyclohexyl-N'-phenyl-p-phenylenediamine); further preferably, among the antioxidants, the amine antioxidants include antioxidant KY405, antioxidant 4010 or a combination thereof; further preferably, among the antioxidants, the amine antioxidants are selected from antioxidant KY405.

[0018] Preferably, among the antioxidants, the thioester antioxidants include at least one of the antioxidant DLTP (dilauryl thiodipropionate), the antioxidant DSTP (di(octadecyl) thiodipropionate) or the antioxidant 412S (dilauryl thiodipropionate); further preferably, among the antioxidants, the thioester antioxidants include the antioxidant DLTP, the antioxidant DSTP or a combination thereof; further preferably, among the antioxidants, the thioester antioxidants are selected from the antioxidant DLTP.

[0019] Preferably, among the antioxidants, the phosphite antioxidants include at least one of antioxidant 168 (tris[2,4-di-tert-butylphenyl]phosphite), antioxidant 626 (bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite) or antioxidant 618 (dioctadecylpentaerythritol diphosphite); further preferably, among the antioxidants, the phosphite antioxidants include antioxidant 168, antioxidant 618 or a combination thereof; further preferably, among the antioxidants, the phosphite antioxidants are selected from antioxidant 168.

[0020] Preferably, in the cable material, the antioxidant includes at least one of antioxidant 1010, antioxidant 300, antioxidant 264, antioxidant 1076, antioxidant KY405, antioxidant ODA, antioxidant 4010, antioxidant DLTP, antioxidant DSTP, antioxidant 412S, antioxidant 168, antioxidant 626 or antioxidant 618; further preferably, in the cable material, the antioxidant includes at least one of antioxidant 1010, antioxidant 300, antioxidant 264, antioxidant 1076, antioxidant KY405, antioxidant ODA, antioxidant 4010, antioxidant DLTP, antioxidant DSTP, antioxidant 412S, antioxidant 168, antioxidant 626 or antioxidant 618. Preferably, the cable material comprises at least one of antioxidant KY405, antioxidant 4010, antioxidant DLTP, antioxidant DSTP, antioxidant 168 or antioxidant 618; more preferably, the cable material comprises at least one of antioxidant 1010, antioxidant 300, antioxidant KY405, antioxidant DLTP or antioxidant 168; more preferably, the cable material comprises at least one of antioxidant 1010, antioxidant 300 or antioxidant KY405.

[0021] Preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant 300; further preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant 300 in a mass ratio of 1: (0.5-5); further preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant 300 in a mass ratio of 1: (0.7-4); more preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant 300 in a mass ratio of 1: (0.8-3).

[0022] Preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant KY405; further preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant KY405 in a mass ratio of 1: (0-5); further preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant KY405 in a mass ratio of 1: (0.3-4); more preferably, in the cable material, the antioxidant includes antioxidant 1010 and antioxidant KY405 in a mass ratio of 1: (0.5-3.5).

[0023] Preferably, in the cable material, the antioxidant includes antioxidant 1010, antioxidant 300 and antioxidant KY405; further preferably, in the cable material, the antioxidant includes antioxidant 1010, antioxidant 300 and antioxidant KY405 in a mass ratio of 1: (0.5-5): (0-5); further preferably, in the cable material, the antioxidant includes antioxidant 1010, antioxidant 300 and antioxidant KY405 in a mass ratio of 1: (0.7-4): (0.3-4); more preferably, in the cable material, the antioxidant includes antioxidant 1010, antioxidant 300 and antioxidant KY405 in a mass ratio of 1: (0.8-3): (0.5-3.5).

[0024] Preferably, in the cable material, the melting index of polypropylene at 230°C and 2.16 kg is 0.5-8 g / 10 min; further preferably, in the cable material, the melting index of polypropylene at 230°C and 2.16 kg is 1-5 g / 10 min; further preferably, in the cable material, the melting index of polypropylene at 230°C and 2.16 kg is 2-4 g / 10 min.

[0025] Preferably, in the cable material, the thermoplastic elastomer includes at least one of methyl methacrylate-butadiene-styrene terpolymer, ethylene-vinyl acetate copolymer or ethylene octene copolymer.

[0026] Preferably, in the cable material, the flame retardant includes at least one of magnesium hydroxide, aluminum hydroxide or zinc phosphate; further preferably, in the cable material, the flame retardant includes magnesium hydroxide, aluminum hydroxide or a combination thereof; even further preferably, in the cable material, the flame retardant is selected from magnesium hydroxide.

[0027] Preferably, in the cable material, the smoke and carbon-forming suppressant includes at least one of zinc borate, molybdenum trioxide or zinc oxide; further preferably, in the cable material, the smoke and carbon-forming suppressant includes zinc borate, molybdenum trioxide or a combination thereof; further preferably, in the cable material, the smoke and carbon-forming suppressant is selected from molybdenum trioxide.

[0028] Preferably, the mass fraction of ultra-high molecular weight polyethylene in the cable material is 9 to 27 parts; further preferably, the mass fraction of ultra-high molecular weight polyethylene in the cable material is 10 to 23 parts; further preferably, the mass fraction of ultra-high molecular weight polyethylene in the cable material is 10 to 20 parts.

[0029] Preferably, the mass fraction of nitrile rubber in the cable material is 8 to 27 parts; further preferably, the mass fraction of nitrile rubber in the cable material is 8 to 23 parts; further preferably, the mass fraction of nitrile rubber in the cable material is 8 to 18 parts.

[0030] Preferably, the mass fraction of ethylene propylene rubber in the cable material is 5 to 25 parts; further preferably, the mass fraction of ethylene propylene rubber in the cable material is 6 to 20 parts; further preferably, the mass fraction of ethylene propylene rubber in the cable material is 6 to 15 parts.

[0031] Preferably, the mass fraction of polypropylene in the cable material is 4 to 25 parts; further preferably, the mass fraction of polypropylene in the cable material is 5 to 20 parts; further preferably, the mass fraction of polypropylene in the cable material is 5 to 15 parts.

[0032] Preferably, the mass fraction of the thermoplastic elastomer in the cable material is 6 to 18 parts; further preferably, the mass fraction of the thermoplastic elastomer in the cable material is 7 to 16 parts; further preferably, the mass fraction of the thermoplastic elastomer in the cable material is 8 to 14 parts.

[0033] Preferably, the mass fraction of the flame retardant in the cable material is 25 to 60 parts; further preferably, the mass fraction of the flame retardant in the cable material is 30 to 55 parts; further preferably, the mass fraction of the flame retardant in the cable material is 35 to 50 parts.

[0034] Preferably, the mass fraction of the antioxidant in the cable material is 5 to 18 parts; further preferably, the mass fraction of the antioxidant in the cable material is 6 to 15 parts; further preferably, the mass fraction of the antioxidant in the cable material is 6 to 10 parts.

[0035] Preferably, the mass fraction of the smoke suppressant and carbon-forming agent in the cable material is 0.8 to 8 parts; further preferably, the mass fraction of the smoke suppressant and carbon-forming agent in the cable material is 1 to 5 parts; further preferably, the mass fraction of the smoke suppressant and carbon-forming agent in the cable material is 1 to 3 parts.

[0036] Preferably, the mass fraction of the auxiliary agent in the cable material is 3 to 16 parts; further preferably, the mass fraction of the auxiliary agent in the cable material is 4 to 12 parts; further preferably, the mass fraction of the auxiliary agent in the cable material is 5 to 9 parts.

[0037] Preferably, the cable material comprises the following raw materials in parts by mass: 9 to 27 parts of ultra-high molecular weight polyethylene, 8 to 27 parts of nitrile rubber, 5 to 25 parts of ethylene propylene rubber, 4 to 25 parts of polypropylene, 6 to 18 parts of thermoplastic elastomer, 25 to 60 parts of flame retardant, 5 to 18 parts of antioxidant, 0.8 to 8 parts of smoke suppressant and carbonization agent, and 3 to 16 parts of additives.

[0038] Further preferably, the cable material comprises the following raw materials in parts by mass: 10 to 23 parts of ultra-high molecular weight polyethylene, 8 to 23 parts of nitrile rubber, 6 to 20 parts of ethylene propylene rubber, 5 to 20 parts of polypropylene, 7 to 16 parts of thermoplastic elastomer, 30 to 55 parts of flame retardant, 6 to 15 parts of antioxidant, 1 to 5 parts of smoke suppressant and carbonization agent, and 4 to 12 parts of additives.

[0039] Further preferably, the cable material comprises the following raw materials in parts by mass: 10 to 20 parts of ultra-high molecular weight polyethylene, 8 to 18 parts of nitrile rubber, 6 to 15 parts of ethylene propylene rubber, 5 to 15 parts of polypropylene, 8 to 14 parts of thermoplastic elastomer, 35 to 50 parts of flame retardant, 6 to 10 parts of antioxidant, 1 to 3 parts of smoke suppressant and carbonization agent, and 5 to 9 parts of additives.

[0040] Preferably, in the cable material, the additive includes a compatibilizer, a lubricant or a combination thereof.

[0041] Preferably, in the auxiliary agent, the compatibilizer is selected from maleic anhydride grafted copolymer; further preferably, in the auxiliary agent, the compatibilizer includes at least one of maleic anhydride grafted ethylene-vinyl acetate copolymer, maleic anhydride grafted polypropylene or maleic anhydride grafted ethylene-propylene rubber; further preferably, in the auxiliary agent, the compatibilizer includes maleic anhydride grafted ethylene-vinyl acetate copolymer, maleic anhydride grafted polypropylene or a combination thereof; more preferably, in the auxiliary agent, the compatibilizer is selected from maleic anhydride grafted polypropylene.

[0042] Preferably, in the auxiliary agent, the maleic anhydride grafting rate of the compatibilizer is 0.5-3%; further preferably, in the auxiliary agent, the maleic anhydride grafting rate of the compatibilizer is 0.8-2%; further preferably, in the auxiliary agent, the maleic anhydride grafting rate of the compatibilizer is 1-1.5%.

[0043] Preferably, among the auxiliary agents, the lubricant includes at least one of silicone masterbatch, dimethyl silicone oil or stearate; further preferably, among the auxiliary agents, the lubricant includes silicone masterbatch, dimethyl silicone oil or a combination thereof; further preferably, among the auxiliary agents, the lubricant is selected from silicone masterbatch.

[0044] Preferably, the mass fraction of the compatibilizer in the auxiliary agent is 1.9 to 12 parts; further preferably, the mass fraction of the compatibilizer in the cable material is 2.7 to 10 parts; further preferably, the mass fraction of the compatibilizer in the auxiliary agent is 3.5 to 8 parts; more preferably, the mass fraction of the compatibilizer in the auxiliary agent is 4.2 to 7 parts.

[0045] Preferably, the mass fraction of the lubricant in the auxiliary agent is 0.1 to 8 parts; further preferably, the mass fraction of the lubricant in the auxiliary agent is 0.3 to 6 parts; further preferably, the mass fraction of the lubricant in the auxiliary agent is 0.5 to 4 parts; more preferably, the mass fraction of the lubricant in the cable material is 0.8 to 2 parts.

[0046] Preferably, in the cable material, the additives include the following raw materials in mass parts: 1.9-12 parts of compatibilizer, 0.1-8 parts of lubricant; further preferably, in the cable material, the additives include the following raw materials in mass parts: 2.7-10 parts of compatibilizer, 0.3-6 parts of lubricant; further preferably, in the cable material, the additives include the following raw materials in mass parts: 3.5-8 parts of compatibilizer, 0.5-4 parts of lubricant; more preferably, in the cable material, the additives include the following raw materials in mass parts: 4.2-7 parts of compatibilizer, 0.8-2 parts of lubricant.

[0047] Preferably, the cable material comprises the following raw materials in parts by mass: 8 to 30 parts of ultra-high molecular weight polyethylene, 8 to 30 parts of nitrile rubber, 5 to 30 parts of ethylene propylene rubber, 3 to 30 parts of polypropylene, 5 to 20 parts of thermoplastic elastomer, 20 to 70 parts of flame retardant, 5 to 20 parts of antioxidant, 0.5 to 10 parts of smoke suppressant and carbonization agent, 1.9 to 12 parts of compatibilizer, and 0.1 to 8 parts of lubricant.

[0048] Further preferably, the cable material comprises the following raw materials in parts by mass: 9 to 27 parts of ultra-high molecular weight polyethylene, 8 to 27 parts of nitrile rubber, 5 to 25 parts of ethylene propylene rubber, 4 to 25 parts of polypropylene, 6 to 18 parts of thermoplastic elastomer, 25 to 60 parts of flame retardant, 5 to 18 parts of antioxidant, 0.8 to 8 parts of smoke suppressant and carbonization agent, 2.7 to 10 parts of compatibilizer, and 0.3 to 6 parts of lubricant.

[0049] Further preferably, the cable material includes the following raw materials in parts by mass: 10 to 23 parts of ultra-high molecular weight polyethylene, 8 to 23 parts of nitrile rubber, 6 to 20 parts of ethylene propylene rubber, 5 to 20 parts of polypropylene, 7 to 16 parts of thermoplastic elastomer, 30 to 55 parts of flame retardant, 6 to 15 parts of antioxidant, 1 to 5 parts of smoke suppressant and carbonization agent, 3.5 to 8 parts of compatibilizer, and 0.5 to 4 parts of lubricant.

[0050] More preferably, the cable material includes the following raw materials in parts by mass: 10 to 20 parts of ultra-high molecular weight polyethylene, 8 to 18 parts of nitrile rubber, 6 to 15 parts of ethylene propylene rubber, 5 to 15 parts of polypropylene, 8 to 14 parts of thermoplastic elastomer, 35 to 50 parts of flame retardant, 6 to 10 parts of antioxidant, 1 to 3 parts of smoke suppressant and carbonization agent, 4.2 to 7 parts of compatibilizer, and 0.8 to 2 parts of lubricant.

[0051] The second aspect of the present invention provides a method for preparing the cable material according to the first aspect of the present invention, the preparation method comprising the following steps: mixing, plasticizing, extruding and granulating the raw materials of the cable material to obtain the cable material.

[0052] Preferably, in the preparation method, plasticization is carried out by a twin-screw extruder.

[0053] The barrel of the twin-screw extruder can be divided into the following sections from the hopper to the die: conveying section, melting section, mixing section, exhaust section and homogenization section.

[0054] Preferably, the temperature of each section of the twin-screw extruder is: 145-155°C for the conveying section, 150-165°C for the melting section, 160-165°C for the mixing section, 165-165°C for the exhaust section, 170-180°C for the homogenizing section, and 170-175°C for the die.

[0055] Preferably, the rotation speed of the twin-screw extruder is 150-400 rpm; further preferably, the rotation speed of the twin-screw extruder is 200-350 rpm; further preferably, the rotation speed of the twin-screw extruder is 250-300 rpm.

[0056] Preferably, in the preparation method, extrusion granulation is carried out by a single screw extruder.

[0057] The barrel of a single-screw extruder can be divided into the following sections from the hopper to the die: the first zone, the second zone and the third zone.

[0058] Preferably, the temperature of each section of the single-screw extruder is: 170-180°C in the first zone, 170-180°C in the second zone, 170-180°C in the third zone, and 175-185°C in the die.

[0059] Preferably, the rotation speed of the single screw extruder is 10 to 50 rpm; further preferably, the rotation speed of the single screw extruder is 20 to 40 rpm; further preferably, the rotation speed of the single screw extruder is 25 to 35 rpm.

[0060] The third aspect of the present invention provides an application of the cable material described in the first aspect of the present invention, or the preparation method of the cable material described in the second aspect of the present invention in the automotive field.

[0061] Preferably, the automotive field is the new energy vehicle field.

[0062] The beneficial effects of the present invention are:

[0063] The cable material provided by the present invention has excellent high temperature resistance, acid and alkali corrosion resistance and low smoke flame retardant performance, and the radiation-free preparation method provides a safer and more efficient solution for the fast-paced new energy automobile industry.

[0064] Specifically, compared with the prior art, the advantages of the present invention are:

[0065] 1. In the cable material of the present invention, ultra-high molecular weight polyethylene has a large molecular weight, very good chemical stability, is resistant to most acid and alkali corrosion, and is insoluble in general solvents at room temperature; while nitrile rubber is obtained by polymerization of butadiene and acrylonitrile, and has very good organic chemical properties such as high temperature resistance and acid and alkali resistance. The present invention uses a compound of ultra-high molecular weight polyethylene and nitrile rubber to obtain a cable material with good high temperature resistance and acid and alkali corrosion resistance.

[0066] 2. The present invention adjusts the components and dosage of the antioxidant system so that the cable material has better short-term aging and long-term aging performance. The cable material of the present invention has higher tensile strength retention rate and elongation at break retention rate in both short-term heat aging tests and long-term heat aging tests. DETAILED DESCRIPTION

[0067] The content of the present invention is further described in detail below through specific examples. It should also be understood that the following examples are only used to further illustrate the present invention and cannot be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the principles set forth in the present invention all belong to the scope of protection of the present invention. The specific process parameters and the like in the following examples are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not limited to the specific data exemplified below. The raw materials, reagents or devices used in the following examples and comparative examples, unless otherwise specified, can all be obtained from conventional commercial sources, or can be obtained by existing known methods.

[0068] The raw materials used in the examples and comparative examples of the present invention include the following:

[0069] Ultra-high molecular weight polyethylene: viscosity-average molecular weight is 1 million to 2 million; tensile strength is 18 to 35 MPa, elongation is 350 to 600%, Ticona;

[0070] Nitrile rubber: acrylonitrile (AN) content 38%, Japanese JSR;

[0071] EPDM: 190°C, melt index at 2.16kg is 5-8g / 10min, Dow;

[0072] Polypropylene: The melt index is 1-5 g / 10 min at 230 ° C and 2.16 kg, Shell;

[0073] Thermoplastic elastomer: methyl methacrylate-butadiene-styrene terpolymer, Zhong Yuan; ethylene-vinyl acetate copolymer, Formosa Plastics; ethylene octene copolymer, Dow;

[0074] Compatibilizer: Maleic anhydride grafted polypropylene, maleic anhydride grafting rate is 1.5%, Shanghai Jiuju;

[0075] Flame retardant: chemical magnesium hydroxide, Aitek;

[0076] Smoke suppression agent: molybdenum trioxide, Taizhou Best;

[0077] Antioxidants: Antioxidant 1010, BASF; Antioxidant 300, Antioxidant KY405, Changzhou Jiatong Chemical;

[0078] Lubricant: Silicone masterbatch, Baiya.

[0079] Examples 1 to 4 and Comparative Examples 1 to 5

[0080] The mass fraction compositions of the cable material raw materials of Examples 1 to 4 and Comparative Examples 1 to 5 are shown in Table 1:

[0081] Table 1 Mass composition of cable material raw materials of Examples 1 to 4 and Comparative Examples 1 to 5

[0082]

[0083]

[0084] The preparation method of the cable material of Examples 1 to 4 and Comparative Examples 1 to 5 comprises the following steps:

[0085] (1) Weigh the raw materials according to the mass fractions of the raw materials of the cable materials of Examples 1 to 4 and Comparative Examples 1 to 5 in Table 1, respectively, and mix them to obtain a mixed material.

[0086] (2) Add the mixed material to the twin-screw extruder, and after the twin-screw shearing and meshing, put the plasticized material from the twin-screw die head into the single-screw extruder. The twin-screw temperature setting is: conveying section 145-155°C, melting section 150-165°C, mixing section 160-165°C, exhaust section 165-165°C, homogenization section 170-180°C, die head 170-175°C; the speed is set at 200-350rpm.

[0087] (3) Single screw extrusion hot cutting granulation, after granulation, the cable materials of Examples 1 to 4 and Comparative Examples 1 to 5 are obtained respectively. The temperature of the single screw is set as follows: 170-180°C for the feeding section, 170-180°C for the plasticizing section, 170-180°C for the homogenizing section, and 175-185°C for the die; the speed is set at 20-40 rpm.

[0088] Performance Testing

[0089] (1) The tensile strength, elongation at break, retention of tensile strength at 180°C for 168 h, retention of elongation at break at 180°C for 168 h, retention of tensile strength at 150°C for 1000 h, and retention of elongation at break at 150°C for 1000 h of the cable materials of Examples 1 to 4 and Comparative Examples 1 to 5 were tested according to GB / T 1040.

[0090] (2) The cable materials of Examples 1 to 4 and Comparative Examples 1 to 5 were tested in accordance with EN60811-2-1 for the retention of tensile strength after acid immersion at 23°C for 168 h, the retention of elongation at break after acid immersion at 23°C for 168 h, the retention of tensile strength after alkali immersion at 23°C for 168 h, and the retention of elongation at break after alkali immersion at 23°C for 168 h.

[0091] (3) The smoke density of the cable materials of Examples 1 to 4 and Comparative Examples 1 to 5 was tested according to GBT 17651.

[0092] (4) The FT2 flame retardancy of the cable materials of Examples 1 to 4 and Comparative Examples 1 to 5 was tested according to UL 1581.

[0093] The specific test results are shown in Table 2.

[0094] Table 2 Cable material performance test results of Examples 1 to 4 and Comparative Examples 1 to 5

[0095]

[0096]

[0097] As can be seen from Table 2, Examples 1 to 4 and Comparative Examples 1 to 5 can all pass the short-term heat aging test at 180°C for 168h. In contrast, the elongation at break retention rate of Comparative Examples 1 to 2 is low and at a critical value, while Comparative Example 5 cannot pass the short-term heat aging test due to the small amount of antioxidant 1010 and antioxidant KY405. A clear gap can be seen at 150°C for 1000h. Examples 1 to 4 can all pass the long-term heat aging test, and the highest elongation at break retention rate is 65% of that of Example 4. Comparative Examples 1 to 2 and Comparative Example 5 are obviously unqualified. Whether it is short-term aging or long-term aging, it has a lot to do with the antioxidant system and dosage of the cable material.

[0098] It can be seen from the data of the 23℃168h acid immersion test that, except for Comparative Example 1, all others can pass the evaluation, mainly because the ultra-high molecular weight polyethylene has a large molecular weight, very good chemical stability, is resistant to most acid and alkali corrosion, and is insoluble in general solvents at room temperature. Nitrile rubber is obtained by polymerization of butadiene and acrylonitrile, and has very good organic chemical properties such as high temperature resistance and acid and alkali resistance. The addition amount of ultra-high molecular weight polyethylene and nitrile rubber in Comparative Example 1 is relatively small, so that its acid corrosion resistance is not high. The best data of the 23℃168h alkali immersion test is Example 4, with a tensile strength retention rate of 92%, a break elongation retention rate of 95%, and excellent material integrity. The worst is Comparative Example 1. Overall analysis of the acid and alkali resistance of Examples 1 to 4 basically shows a trend of gradually getting better, while Comparative Example 3 and Comparative Example 4 add nitrile rubber and ultra-high molecular weight polyethylene separately. The performance difference is large, and the comprehensive performance has no advantage. The smoke density evaluation can pass the test, but due to the addition of more nitrile rubber and EPDM, the result of Example 4 is low. Examples 1 to 4 and Comparative Examples 1 to 5 can all pass the UL1581FT2 flame retardancy test.

[0099] From the above analysis, it can be seen that the cable material provided by the present invention has excellent high temperature resistance, acid and alkali corrosion resistance and low smoke flame retardant properties. At the same time, the radiation-free preparation method provides a safer and more efficient solution for the fast-paced automotive industry, especially the new energy automotive industry.

Claims

1. A cable material, characterized in that: The invention comprises the following raw materials in parts by weight: 8 to 30 parts of ultra-high molecular weight polyethylene, 8 to 30 parts of nitrile rubber, 5 to 30 parts of ethylene propylene rubber, 3 to 30 parts of polypropylene, 5 to 20 parts of thermoplastic elastomer, 20 to 70 parts of flame retardant, 5 to 20 parts of antioxidant, 0.5 to 10 parts of smoke suppressant and carbon forming agent, and 2 to 20 parts of auxiliary agent; The antioxidants include antioxidant 1010, antioxidant 300 and antioxidant KY405 in a mass ratio of 1: (0.8-3): (0.5-3.5).

2. The cable material according to claim 1, characterized in that: The viscosity average molecular weight of the ultra-high molecular weight polyethylene is 1 million to 4 million; And / or, the tensile strength of the ultra-high molecular weight polyethylene is 15-40 MPa; And / or, the elongation at break of the ultra-high molecular weight polyethylene is 300-700%.

3. The cable material according to claim 1, characterized in that: The acrylonitrile content of the nitrile rubber is 30-45wt%.

4. The cable material according to claim 1, characterized in that: The ethylene-propylene rubber has a melting index of 3-10 g / 10 min at 190° C. and 2.16 kg.

5. The cable material according to claim 1, characterized in that: The melt index of the polypropylene at 230° C. and 2.16 kg is 0.5 to 8 g / 10 min; and / or, the thermoplastic elastomer comprises at least one of a methyl methacrylate-butadiene-styrene terpolymer, an ethylene-vinyl acetate copolymer or an ethylene octene copolymer; and / or, the flame retardant comprises at least one of magnesium hydroxide, aluminum hydroxide or zinc phosphate; And / or, the smoke suppression and carbon formation agent includes at least one of zinc borate, molybdenum trioxide or zinc oxide.

6. The cable material according to claim 1, characterized in that: The auxiliary agent includes a compatibilizer, a lubricant or a combination thereof.

7. The cable material according to claim 6, characterized in that: The auxiliary agent comprises the following raw materials in parts by weight: 1.9 to 12 parts of a compatibilizer and 0.1 to 8 parts of a lubricant.

8. The cable material according to claim 6, characterized in that: The compatibilizer is selected from maleic anhydride graft copolymers.

9. The cable material according to claim 8, characterized in that: The maleic anhydride grafting rate of the maleic anhydride grafted copolymer is 0.5-3%.

10. The cable material according to claim 6, characterized in that: The lubricant includes at least one of silicone masterbatch, dimethyl silicone oil or stearate.

11. The method for preparing a cable material according to any one of claims 1 to 10, characterized in that: The following steps are involved: The raw materials are mixed, plasticized, extruded and granulated to obtain the cable material.

12. Use of the cable material according to any one of claims 1 to 10 in the automotive field.

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