A cable for new energy vehicles

Abstract

The present invention discloses a cable for new energy vehicles, comprising: a plurality of conductors, comprising a conductor core and an insulating layer coated on the outside of the conductor core; reinforcing ribs are axially arranged between the plurality of conductors, the outer surface of the reinforcing ribs is in close contact with the outer surface of the conductor, and polypropylene filling is arranged between the conductors; an inner layer skeleton is arranged on the outside of the conductor, the inner layer skeleton is arranged as a sandwich structure, a first inert gas bag is arranged inside the inner layer skeleton, an inner circle of the inner layer skeleton is integrally formed with an embedded skeleton, one end of the embedded skeleton is connected to the inner layer skeleton, and the other end is embedded in the polypropylene filling; a second inert gas bag is arranged in the embedded skeleton, and the first inert gas bag is connected to the second inert gas bag; a flame retardant layer is arranged on the outside of the inner layer skeleton, and a sheath is coated on the outside of the flame retardant layer. The present invention improves the structure and materials of the cable for new energy vehicles, and obtains a cable for new energy vehicles with high fire resistance and high flame retardancy.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile cables, and more specifically, the present invention relates to a cable for new energy vehicles. Background Art

[0002] With the rapid development of the new energy vehicle industry, more and more electric vehicles are being produced, and new energy electric vehicles are also the first choice of more and more car buyers. Unlike traditional internal combustion engine vehicles that rely on gasoline or diesel combustion to provide power, new energy electric vehicles use batteries as engines to provide power. Therefore, new energy electric vehicles need to be charged and discharged for a long time and frequently during energy storage, charging and driving. At the same time, the battery capacity of new energy vehicles is getting bigger and bigger. In order to provide customers with a better user experience, it is necessary to complete the charging of large-capacity batteries in a shorter time as possible, so a larger charging power is required. For example, the output voltage of a certain charging pile can reach 750V and the current can reach 480A. Based on the above reasons, during the charging and driving of the car, the cable has to carry a large current for a long time, which requires that the new energy vehicle cable should have high fire resistance and aging resistance on the basis of good insulation performance, and should have good flame retardant properties when burning.

[0003] At present, flame-retardant cables are widely used in various occasions. Flame-retardant cables refer to cables that, under specified test conditions, when the sample is ignited, after the test fire source is removed, the spread of the flame is limited to a limited range, and the residual flame or residual burning can extinguish itself within a limited time. After a fire occurs, parts of the flame-retardant cable may be burned and cannot be used normally, but the spread of the fire can be prevented, the burning range can be limited to a local range, and no spread can occur, other equipment can be saved, and greater losses can be avoided. For new energy electric vehicles, due to their special usage scenarios, the safety of drivers and passengers in new energy electric vehicles during driving is particularly important. After parking, there are usually many other vehicles and building facilities around them, so the cables installed should have flame retardant properties and fire resistance that are better than the current flame-retardant cables. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these purposes and other advantages according to the present invention, a cable for new energy vehicles is provided, comprising:

[0006] A plurality of conductors, comprising a conductor core and an insulating layer covering the conductor core; reinforcing ribs are axially arranged between the plurality of conductors, the outer surface of the reinforcing ribs is in close contact with the outer surface of the conductor, and polypropylene filling is arranged between the conductors;

[0007] An inner layer skeleton is arranged outside the wire, the inner layer skeleton is arranged as a sandwich structure, a first inert gas bag is arranged inside the inner layer skeleton, an inner circle of the inner layer skeleton is integrally formed with an embedded skeleton, one end of the embedded skeleton is connected to the inner layer skeleton, and the other end is embedded in the interior filled with polypropylene; a second inert gas bag is arranged in the embedded skeleton, and the first inert gas bag is connected to the second inert gas bag;

[0008] The flame retardant layer is arranged outside the inner layer skeleton, and the outside of the flame retardant layer is covered with a sheath.

[0009] Preferably, the outside of the insulating layer is coated with a first shielding layer, the outside of the polypropylene filling is provided with a second shielding layer, a wrapping layer is provided between the second shielding layer and the inner skeleton, and the embedded skeleton penetrates the wrapping layer and is embedded in the interior of the polypropylene filling.

[0010] Preferably, a waterproof layer is provided between the inner skeleton and the flame retardant layer.

[0011] Preferably, the inner layer skeleton is axially provided with reinforcing wires on the outside.

[0012] Preferably, a plurality of elliptical holes are arranged at intervals on the outer ring of the inner layer skeleton.

[0013] Preferably, the method for preparing the insulating layer comprises:

[0014] Step S11, weighing, by weight, 10 to 60 parts of polyvinyl chloride resin, 4 to 7 parts of modified polymethyl acrylate, 3 to 8 parts of dioctyl terephthalate, 1 to 3 parts of graphene, 5 to 10 parts of calcium carbonate, 4 to 6 parts of kaolin, 1 to 3 parts of stabilizer 1984, 0.3 to 0.9 parts of barium stearate, and 15 to 25 parts of dioctyl terephthalate;

[0015] Step S12, uniformly mixing the weighed polyvinyl chloride resin, modified polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, feeding the mixture into an extruder, and performing extrusion granulation at 115-170° C. to obtain an insulating material;

[0016] Step S13, mixing the insulating material and the masterbatch in a weight ratio of 50-100:1, and then feeding the mixture into an extruder, setting 6 extrusion temperature intervals, the temperatures of the 6 temperature intervals are 105-125°C, 120-150°C, 135-155°C, 150-165°C, 155-170°C, and 160-185°C respectively; and obtaining an insulating layer through plasticizing and extrusion.

[0017] Preferably, the preparation method of the modified polymethyl acrylate comprises: weighing 20 to 45 parts of polymethyl acrylate, 1 to 2.5 parts of silicon dioxide powder, and 0.5 to 1.2 parts of vinyltrimethoxysilane by weight, ultrasonically dispersing the silicon dioxide powder in 200 parts of ethanol solution, the ultrasonic frequency is 45 to 60 kHz, and the dispersion time is 30 to 80 minutes to obtain a mixed slurry A; adding polymethyl acrylate and vinyltrimethoxysilane to the mixed slurry A at the same time, stirring at a speed of 120 r / min for 1 hour to obtain a mixed slurry B; evaporating and concentrating the mixed slurry B to obtain a mixed powder, melt-blending the mixed powder with 5 to 10 parts of sodium dodecylbenzene sulfonate at a melt blending temperature of 105 to 125° C., cooling the product with cooling water, and drying to obtain the modified polymethyl acrylate.

[0018] Preferably, the method for preparing the flame retardant layer comprises:

[0019] Step S21, weighing 50-70 parts of methyl vinyl silicone rubber, 20-25 parts of silicon dioxide powder, 15-22 parts of porcelain powder, 2-6 parts of zinc oxide, 3-7 parts of hydroxy siloxane, 40-60 parts of aluminum hydroxide powder, 10-12 parts of PE resin, 0.2-3 parts of hindered phenol antioxidant, 0.5-1.8 parts of vinyl tri(β-methoxyethoxy) silane, 1-5 parts of dye, and 0.3-1.5 parts of benzoyl peroxide by weight; mixing the above substances and mixing them into the rubber material, the mixing temperature of the rubber material is 75-90° C., and obtaining a mixed crude material;

[0020] Step S22, when the temperature of the mixed crude material is lower than 60°C, adding 0.3-1.5 parts of benzoyl peroxide to the mixed crude material to vulcanize the rubber material, stirring and mixing and heating to 200-320°C, the rubber material vulcanization time is 20-30 minutes;

[0021] Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 40-50° C., to obtain a flame retardant layer.

[0022] Preferably, the sheath is made of polyvinyl chloride resin, the inner layer skeleton and the embedded skeleton are made of PE or PP, and the first inert air bag and the second inert air bag are made of polycarbonate.

[0023] Preferably, the first inert gas bag and the second inert gas bag are filled with an inert gas, and the inert gas is helium or argon, or a mixed gas of helium, argon and carbon dioxide.

[0024] The present invention has at least the following beneficial effects:

[0025] The present invention provides a cable for new energy vehicles, wherein an inner layer skeleton and an embedded skeleton are integrally formed inside the cable, and a first inert gas bag and a second inert gas bag are respectively arranged in the inner layer skeleton and the embedded skeleton, and a certain amount of inert gas (helium or argon, or a mixture of carbon dioxide and helium or argon) is stored in the first inert gas bag and the second inert gas bag. When the sheath and the flame retardant layer are burned through, the inert gas is released outside the burn-through point to isolate the air at the burn-through point, thereby effectively preventing the expansion of the combustion range and playing a flame retardant role. This structural setting makes full use of the radial space inside the cable. Compared with the existing thin-layer gas-filled cable structure, the new energy vehicle cable provided by the present invention can be filled with more inert gas, so that more inert gas can be released when the flame retardant is released, and the flame retardant effect is better. The inner layer skeleton and the embedded skeleton have a containing, supporting and protecting effect on the first inert gas bag and the second inert gas bag, thereby preventing the first inert gas bag and the second inert gas bag from being damaged during the bending process of the cable, thereby causing the release of inert gas.

[0026] The present invention provides a cable for new energy vehicles. In the preparation process of the insulation layer, polymethyl acrylate is modified. In the modification process, silicon dioxide powder and polymethyl acrylate are cross-linked using vinyl trimethoxy silane, and then sodium dodecyl sulfate is used for blending. The obtained modified polymethyl acrylate has excellent fire resistance and corrosion resistance. The modified polymethyl acrylate is mixed with polyvinyl chloride resin, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate for plasticizing and extrusion. The obtained insulation layer has excellent fire resistance and corrosion resistance, thereby improving the fire resistance of the cable.

[0027] The present invention provides a cable for new energy vehicles. In the preparation process of the flame retardant layer, aluminum hydroxide powder is used as a flame retardant to improve the fire resistance and flame retardant performance of the flame retardant layer. Silicon dioxide powder is used as a reinforcing filler to improve the tensile strength and tear resistance of the flame retardant layer. Hydroxysiloxane is used as an auxiliary agent to improve the organic combination of silicon dioxide and methyl vinyl silicone rubber, thereby improving the waterproof performance of the flame retardant layer. At the same time, the flame retardant layer uses methyl vinyl silicone rubber as the main raw material, so the prepared cable also has the advantages of low smoke, softness, non-toxicity and good wear resistance.

[0028] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the cross-sectional structure of the cable for new energy vehicles provided by the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0031] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0032] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the term is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, in the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] like Figure 1 As shown: a schematic diagram of the cross-sectional structure of a cable for new energy vehicles of the present invention, comprising:

[0036] Four conductors, comprising a conductor core 1 and an insulating layer 2 covering the conductor core; reinforcing ribs 4 are axially arranged between the conductors, the outer surface of the reinforcing ribs 4 is in close contact with the outer surface of the conductors, and polypropylene filling 6 is arranged between the conductors;

[0037] The outer part of the wire is provided with an inner layer skeleton 7, the inner layer skeleton 7 is provided with a sandwich structure, the inner part of the inner layer skeleton 7 is provided with a first inert gas bag 8, the inner circle of the inner layer skeleton is integrally formed with four embedded skeletons 9, one end of the embedded skeleton 9 is connected to the inner layer skeleton 7, and the other end is embedded in the polypropylene filling 6; the embedded skeleton 9 is provided with a second inert gas bag 10, and the first inert gas bag 8 is connected to the second inert gas bag 10;

[0038] The flame retardant layer 11 is arranged outside the inner layer skeleton 7 , and the outside of the flame retardant layer 11 is covered with a sheath 12 .

[0039] The present invention provides a cable for new energy vehicles, wherein an inner layer skeleton 7 and an inner embedded skeleton 9 are integrally formed inside the cable, and a first inert gas bag 8 and a second inert gas bag 10 are respectively arranged in the inner layer skeleton 7 and the inner embedded skeleton 9, and a certain amount of inert gas (helium or argon, or a mixture of carbon dioxide and helium or argon) is stored in the first inert gas bag 8 and the second inert gas bag 10. When the sheath 12 and the flame retardant layer 11 are burned through, the inert gas is released outside the burn-through point to isolate the burn-through point from the outside air. This method can effectively prevent the expansion of the combustion range and achieve a flame retardant effect. At the same time, compared with the existing thin layer filling The cable structure of gas, this structural setting of the present invention makes full use of the radial space inside the cable. The cable for new energy vehicles provided by the present invention can be filled with more inert gas, so that more inert gas can be released during flame retardant release, and the flame retardant effect is better; the inner layer skeleton 7 and the embedded skeleton 9 have the functions of accommodating, supporting and protecting the first inert gas bag 8 and the second inert gas bag 10, preventing the first inert gas bag 8 and the second inert gas bag 10 from being damaged during the bending process of the cable, thereby causing accidental release of the inert gas; the function of the reinforcing rib 4 is to increase the internal strength of the cable and enhance the bending resistance of the cable; the first shielding layer 3 is used for signal shielding.

[0040] In the above technical solution, the outside of the insulating layer 2 is coated with a first shielding layer 3, the outside of the polypropylene filling 6 is provided with a second shielding layer 13, a wrapping layer 5 is provided between the second shielding layer 13 and the inner skeleton 7, and the embedded skeleton 9 penetrates the wrapping layer 5 and is embedded in the polypropylene filling 6. The first shielding layer 3 and the second shielding layer 13 are used to shield the signal.

[0041] In the above technical solution, a waterproof layer 14 is provided between the inner skeleton 7 and the flame retardant layer. When the sheath 12 and the flame retardant layer 11 are worn, the waterproof layer 14 can effectively prevent external moisture from entering the conductor core.

[0042] In the above technical solution, a reinforcing wire 15 is axially arranged outside the inner layer skeleton 7, and the reinforcing wire 15 is used to enhance the bending resistance of the inner layer skeleton.

[0043] In the above technical solution, the outer circle of the inner layer skeleton 7 is provided with a plurality of elliptical holes at intervals. When the sheath and the flame retardant layer are burned through, the elliptical holes serve as release ports for the inert gas.

[0044] In the above technical solution, the material of the sheath 12 is polyvinyl chloride resin, the material of the inner layer skeleton 7 and the embedded skeleton 9 is PE or PP, and the material of the first inert air bag 8 and the second inert air bag 10 is polycarbonate.

[0045] Example 1

[0046] A method for preparing an insulating layer of a cable for a new energy vehicle of this embodiment comprises the following steps:

[0047] Step S11, weighing 10 kg of polyvinyl chloride resin, 4 kg of modified polymethyl acrylate, 3 kg of dioctyl phthalate, 1 kg of graphene, 5 kg of calcium carbonate, 4 kg of kaolin, 1 kg of stabilizer 1984, 0.3 kg of barium stearate, and 15 kg of dioctyl terephthalate;

[0048] Step S12, uniformly mixing the weighed polyvinyl chloride resin, modified polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, putting the mixture into an extruder, and performing extrusion granulation at 120° C. to obtain an insulating material;

[0049] Step S13, the insulating material and the masterbatch are mixed at a weight ratio of 60:1, and then the mixture is put into an extruder, and 6 extrusion temperature intervals are set, and the temperatures of the 6 temperature intervals are 105° C., 120° C., 135° C., 150° C., 155° C., and 160° C. respectively; and the insulating layer is obtained by plasticizing and extruding;

[0050] The preparation method of modified polymethyl acrylate comprises: weighing 20 kg of polymethyl acrylate, 1 kg of silicon dioxide powder, and 0.5 kg of vinyl trimethoxysilane, ultrasonically dispersing the silicon dioxide powder in 200 kg of ethanol solution, the ultrasonic frequency is 45 kHz, and the dispersion time is 30 min to obtain a mixed slurry A; adding polymethyl acrylate and vinyl trimethoxysilane to the mixed slurry A at the same time, stirring at a speed of 120 r / min for 1 hour to obtain a mixed slurry B; evaporating and concentrating the mixed slurry B to obtain a mixed powder, melt-blending the mixed powder with 5 kg of sodium dodecylbenzene sulfonate at a melt-blending temperature of 105° C., cooling the product with cooling water, and drying to obtain modified polymethyl acrylate.

[0051] The method for preparing the flame retardant layer comprises the following steps:

[0052] Step S21, weighing 50kg of methyl vinyl silicone rubber, 20kg of silicon dioxide powder, 15kg of porcelain powder, 2kg of zinc oxide, 3kg of hydroxy siloxane, 40kg of aluminum hydroxide powder, 10kg of PE resin, 0.2kg of hindered phenol antioxidant, 0.5kg of vinyl tri(β-methoxyethoxy) silane, 1kg of dye, and 0.3kg of benzoyl peroxide; mixing the above substances and mixing them into the rubber material, the mixing temperature of the rubber material is 75° C., and obtaining a mixed crude material;

[0053] Step S22, when the temperature of the mixed crude material is lower than 60°C, 0.3 kg of benzoyl peroxide is added to the mixed crude material to vulcanize the rubber material, stir and mix and heat to 200°C, and the rubber material vulcanization time is 20 minutes;

[0054] Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 40° C., to obtain a flame retardant layer.

[0055] Example 2

[0056] A method for preparing an insulating layer of a cable for a new energy vehicle of this embodiment comprises the following steps:

[0057] Step S11, weighing 20 kg of polyvinyl chloride resin, 5 kg of modified polymethyl acrylate, 4 kg of dioctyl phthalate, 2 kg of graphene, 7 kg of calcium carbonate, 5 kg of kaolin, 2 kg of stabilizer 1984, 0.6 kg of barium stearate, and 20 kg of dioctyl terephthalate;

[0058] Step S12, uniformly mixing the weighed polyvinyl chloride resin, modified polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, putting the mixture into an extruder, and performing extrusion granulation at 140° C. to obtain an insulating material;

[0059] Step S13, the insulating material and the masterbatch are mixed at a weight ratio of 80:1, and then the mixture is put into an extruder, and 6 extrusion temperature intervals are set, and the temperatures of the 6 temperature intervals are 110° C., 130° C., 135° C., 160° C., 170° C., and 185° C. respectively; and the insulating layer is obtained by plasticizing and extruding;

[0060] The preparation method of modified polymethyl acrylate comprises: weighing 30 kg of polymethyl acrylate, 1.5 kg of silicon dioxide powder, and 1 kg of vinyl trimethoxysilane, ultrasonically dispersing the silicon dioxide powder in 200 kg of ethanol solution, the ultrasonic frequency is 50 kHz, and the dispersion time is 50 min to obtain a mixed slurry A; adding polymethyl acrylate and vinyl trimethoxysilane to the mixed slurry A at the same time, stirring at a speed of 120 r / min for 1 hour, and obtaining a mixed slurry B; evaporating and concentrating the mixed slurry B to obtain a mixed powder, melt-blending the mixed powder with 8 kg of sodium dodecylbenzene sulfonate at a melt blending temperature of 115° C., cooling the product with cooling water, and drying to obtain modified polymethyl acrylate.

[0061] The method for preparing the flame retardant layer comprises the following steps:

[0062] Step S21, weighing 60kg of methyl vinyl silicone rubber, 20kg of silicon dioxide powder, 20kg of porcelain powder, 5kg of zinc oxide, 4kg of hydroxy siloxane, 45kg of aluminum hydroxide powder, 12kg of PE resin, 1.5kg of hindered phenol antioxidant, 1.2kg of vinyl tri(β-methoxyethoxy) silane, 3kg of dye, and 1kg of benzoyl peroxide; mixing the above substances and mixing them into the rubber material, the mixing temperature of the rubber material is 80° C., and obtaining a mixed crude material;

[0063] Step S22, when the temperature of the mixed crude material is lower than 60°C, 1 kg of benzoyl peroxide is added to the mixed crude material to vulcanize the rubber material, stir and mix and heat to 250°C, and the rubber material vulcanization time is 28 minutes;

[0064] Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 50° C., to obtain a flame retardant layer.

[0065] Example 3

[0066] A method for preparing an insulating layer of a cable for a new energy vehicle of this embodiment comprises the following steps:

[0067] Step S11, weighing 60 kg of polyvinyl chloride resin, 7 kg of modified polymethyl acrylate, 8 kg of dioctyl phthalate, 3 kg of graphene, 10 kg of calcium carbonate, 6 kg of kaolin, 3 kg of stabilizer 1984, 0.9 kg of barium stearate, and 25 kg of dioctyl terephthalate;

[0068] Step S12, uniformly mixing the weighed polyvinyl chloride resin, modified polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, putting the mixture into an extruder, and performing extrusion granulation at 170° C. to obtain an insulating material;

[0069] Step S13, the insulating material and the masterbatch are mixed at a weight ratio of 100:1, and then the mixture is put into an extruder, and 6 extrusion temperature intervals are set, and the temperatures of the 6 temperature intervals are 125° C., 150° C., 155° C., 165° C., 170° C., and 185° C. in sequence; and the insulating layer is obtained by plasticizing and extruding;

[0070] The preparation method of modified polymethyl acrylate comprises: weighing 45 kg of polymethyl acrylate, 2.5 kg of silicon dioxide powder, and 1.2 kg of vinyl trimethoxysilane, ultrasonically dispersing the silicon dioxide powder in 200 kg of ethanol solution, the ultrasonic frequency is 60 kHz, and the dispersion time is 80 min to obtain a mixed slurry A; adding polymethyl acrylate and vinyl trimethoxysilane to the mixed slurry A at the same time, stirring at a speed of 120 r / min for 1 hour, and obtaining a mixed slurry B; evaporating and concentrating the mixed slurry B to obtain a mixed powder, melt-blending the mixed powder with 10 kg of sodium dodecylbenzene sulfonate at a melt blending temperature of 125° C., cooling the product with cooling water, and drying to obtain modified polymethyl acrylate.

[0071] The method for preparing the flame retardant layer comprises the following steps:

[0072] Step S21, weighing 70kg of methyl vinyl silicone rubber, 25kg of silicon dioxide powder, 22kg of porcelain powder, 6kg of zinc oxide, 7kg of hydroxysiloxane, 60kg of aluminum hydroxide powder, 12kg of PE resin, 3kg of hindered phenol antioxidant, 1.8kg of vinyl tri(β-methoxyethoxy)silane, 5kg of dye, and 1.5kg of benzoyl peroxide; mixing the above substances and mixing them into the rubber material at a mixing temperature of 90° C. to obtain a mixed crude material;

[0073] Step S22, when the temperature of the mixed crude material is lower than 60°C, 1.5 kg of benzoyl peroxide is added to the mixed crude material to vulcanize the rubber material, and the mixture is stirred and heated to 320°C. The vulcanization time of the rubber material is 30 minutes;

[0074] Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 50° C., to obtain a flame retardant layer.

[0075] Comparative Example 1

[0076] A method for preparing an insulating layer of a cable for a new energy vehicle of this embodiment comprises the following steps:

[0077] Step S11, weighing 20 kg of polyvinyl chloride resin, 5 kg of polymethyl acrylate, 4 kg of dioctyl phthalate, 2 kg of graphene, 7 kg of calcium carbonate, 5 kg of kaolin, 2 kg of stabilizer 1984, 0.6 kg of barium stearate, and 20 kg of dioctyl terephthalate;

[0078] Step S12, uniformly mixing the weighed polyvinyl chloride resin, polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, putting the mixture into an extruder, and performing extrusion granulation at 140° C. to obtain an insulating material;

[0079] Step S13, the insulating material and the masterbatch are mixed at a weight ratio of 80:1, and then the mixture is put into an extruder, and 6 extrusion temperature intervals are set, and the temperatures of the 6 temperature intervals are 110° C., 130° C., 135° C., 160° C., 170° C., and 185° C. respectively; and the insulating layer is obtained by plasticizing and extruding;

[0080] The method for preparing the flame retardant layer comprises the following steps:

[0081] Step S21, weighing 60kg of methyl vinyl silicone rubber, 20kg of silicon dioxide powder, 20kg of porcelain powder, 5kg of zinc oxide, 4kg of hydroxy siloxane, 45kg of aluminum hydroxide powder, 12kg of PE resin, 1.5kg of hindered phenol antioxidant, 1.2kg of vinyl tri(β-methoxyethoxy) silane, 3kg of dye, and 1kg of benzoyl peroxide; mixing the above substances and mixing them into the rubber material, the mixing temperature of the rubber material is 80° C., and obtaining a mixed crude material;

[0082] Step S22, when the temperature of the mixed crude material is lower than 60°C, 1 kg of benzoyl peroxide is added to the mixed crude material to vulcanize the rubber material, stir and mix and heat to 250°C, and the rubber material vulcanization time is 28 minutes;

[0083] Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 50° C., to obtain a flame retardant layer.

[0084] Comparative Example 2

[0085] A method for preparing an insulating layer of a cable for a new energy vehicle of this embodiment comprises the following steps:

[0086] Step S11, weighing 20 kg of polyvinyl chloride resin, 5 kg of modified polymethyl acrylate, 4 kg of dioctyl phthalate, 2 kg of graphene, 7 kg of calcium carbonate, 5 kg of kaolin, 2 kg of stabilizer 1984, 0.6 kg of barium stearate, and 20 kg of dioctyl terephthalate;

[0087] Step S12, uniformly mixing the weighed polyvinyl chloride resin, modified polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, putting the mixture into an extruder, and performing extrusion granulation at 140° C. to obtain an insulating material;

[0088] Step S13, the insulating material and the masterbatch are mixed at a weight ratio of 80:1, and then the mixture is put into an extruder, and 6 extrusion temperature intervals are set, and the temperatures of the 6 temperature intervals are 110° C., 130° C., 135° C., 160° C., 170° C., and 185° C. respectively; and the insulating layer is obtained by plasticizing and extruding;

[0089] The preparation method of modified polymethyl acrylate comprises: weighing 30 kg of polymethyl acrylate, 1.5 kg of silicon dioxide powder, and 1 kg of vinyl trimethoxysilane, ultrasonically dispersing the silicon dioxide powder in 200 kg of ethanol solution, the ultrasonic frequency is 50 kHz, and the dispersion time is 50 min to obtain a mixed slurry A; adding polymethyl acrylate and vinyl trimethoxysilane to the mixed slurry A at the same time, stirring at a speed of 120 r / min for 1 hour, and obtaining a mixed slurry B; evaporating and concentrating the mixed slurry B to obtain a mixed powder, melt-blending the mixed powder with 8 kg of sodium dodecylbenzene sulfonate at a melt blending temperature of 115° C., cooling the product with cooling water, and drying to obtain modified polymethyl acrylate.

[0090] The method for preparing the flame retardant layer comprises the following steps:

[0091] Step S21, weighing 60kg of methyl vinyl silicone rubber, 20kg of porcelain powder, 74kg of zinc oxide, 12kg of PE resin, 1.5kg of hindered phenol antioxidant, 1.2kg of vinyl tri(β-methoxyethoxy)silane, 3kg of dye, and 1kg of benzoyl peroxide; mixing the above substances and mixing them into the rubber material at a mixing temperature of 80° C. to obtain a mixed crude material;

[0092] Step S22, when the temperature of the mixed crude material is lower than 60°C, 1 kg of benzoyl peroxide is added to the mixed crude material to vulcanize the rubber material, stir and mix and heat to 250°C, and the rubber material vulcanization time is 28 minutes;

[0093] Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 50° C., to obtain a flame retardant layer.

[0094] The fire resistance and flame retardancy of the cables for new energy vehicles prepared in Examples 1 to 3, Comparative Example 1 and Comparative Example 2 were tested, wherein the test method for the fire resistance was:

[0095] The cables for new energy vehicles of Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to fire resistance tests to simulate the burning conditions of the wires in a fire situation. A 100cm length of cable was taken and fixed in a combustion test box for a combustion test. The test standard was BS6387-2013, the flame temperature was 950°C, and the cable was burned for 3 hours to detect whether a short circuit occurred. If the cable did not short-circuit, it proved that the cable could withstand a fire for 3 hours without short-circuiting, and would not cause secondary damage to the environment and personal safety.

[0096] The test method for flame retardant properties of cables is in accordance with GB / T 2918-1996. The cable samples of Examples 1 to 3, Comparative Example and Comparative Example 2 are tested. Cable test samples with a length of 200 cm are taken respectively. The test samples are placed on a vertical combustion apparatus for flame retardant performance testing to obtain the flame retardant time of each cable. The longer the flame retardant time, the better the flame retardant performance of the sample. At the same time, the oxygen index of the cables obtained in Examples 1 to 3, Comparative Example 1 and Comparative Example 1 is tested. The oxygen index refers to the minimum oxygen concentration required for the material to burn with flames in an oxygen-nitrogen mixed gas flow under specified conditions. It is expressed as a numerical value of the volume percentage occupied by oxygen. A high oxygen index indicates that the material is not easy to burn, and a low oxygen index indicates that the material is easy to burn. The following table is obtained based on the test results:

[0097] Is it short circuit? Flame retardant time(s) Oxygen index (%) Example 1 no 3.8 61.5 Example 2 no 3.9 62.2 Example 3 no 3.7 62.3 Comparative Example 1 yes 1.7 38.4 Comparative Example 2 yes 2.1 33.5

[0098] The cables prepared in Examples 1 to 3, Comparative Examples 1 and 3 all adopt the present invention. Figure 1 As shown in the structure, since the insulation layers of the cables of Examples 1 to 3 use modified polymethyl acrylate and the flame retardant layers use aluminum hydroxide as a flame retardant, the heat resistance and flame retardant properties of the cables of Examples 1 to 3 are better than those of Comparative Examples 1 and 2.

[0099] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0100] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A cable for new energy vehicles, characterized in that: include: A plurality of wires, comprising a wire core and an insulating layer covering the wire core; A reinforcing rib is axially arranged between the plurality of wires, the outer surface of the reinforcing rib is in close contact with the outer surface of the wire, and polypropylene filling is arranged between the wires; An inner layer skeleton is arranged outside the wire, the inner layer skeleton is arranged as a sandwich structure, a first inert gas bag is arranged inside the inner layer skeleton, an inner circle of the inner layer skeleton is integrally formed with an embedded skeleton, one end of the embedded skeleton is connected to the inner layer skeleton, and the other end is embedded in the interior filled with polypropylene; a second inert gas bag is arranged in the embedded skeleton, and the first inert gas bag is connected to the second inert gas bag; A flame retardant layer, which is arranged outside the inner layer skeleton, and the outside of the flame retardant layer is covered with a sheath; The outside of the insulating layer is coated with a first shielding layer, the outside of the polypropylene filling is provided with a second shielding layer, a wrapping layer is provided between the second shielding layer and the inner skeleton, and the embedded skeleton penetrates the wrapping layer and is embedded in the inside of the polypropylene filling; A waterproof layer is provided between the inner layer skeleton and the flame retardant layer; The outer axial portion of the inner layer skeleton is provided with reinforcing wires; The outer ring of the inner layer skeleton is provided with a plurality of elliptical holes at intervals; The sheath is made of polyvinyl chloride resin, the inner frame and the embedded frame are made of PE or PP, and the first inert air bag and the second inert air bag are made of polycarbonate; The first inert gas bag and the second inert gas bag are filled with inert gas, and the inert gas is helium or argon, or a mixed gas of helium, argon and carbon dioxide.

2. The cable for new energy vehicles according to claim 1, characterized in that: The method for preparing the insulating layer comprises: Step S11, weighing, by weight, 10-60 parts of polyvinyl chloride resin, 4-7 parts of modified polymethyl acrylate, 3-8 parts of dioctyl phthalate, 1-3 parts of graphene, 5-10 parts of calcium carbonate, 4-6 parts of kaolin, 1-3 parts of stabilizer 1984, 0.3-0.9 parts of barium stearate, and 15-25 parts of dioctyl terephthalate; Step S12, uniformly mixing the weighed polyvinyl chloride resin, modified polymethyl acrylate, octyl phthalate, graphene, calcium carbonate, kaolin, stabilizer 1984, barium stearate, and dioctyl terephthalate to obtain a mixture, feeding the mixture into an extruder, and performing extrusion granulation at 115-170° C. to obtain an insulating material; Step S13, mixing the insulating material and the masterbatch in a weight ratio of 50-100:1, and then feeding the mixture into an extruder, setting 6 extrusion temperature intervals, the temperatures of the 6 temperature intervals are 105-125°C, 120-150°C, 135-155°C, 150-165°C, 155-170°C, and 160-185°C respectively; and obtaining an insulating layer through plasticizing and extrusion.

3. The cable for new energy vehicles according to claim 2, characterized in that: The preparation method of the modified polymethyl acrylate comprises: weighing 20-45 parts of polymethyl acrylate, 1-2.5 parts of silicon dioxide powder, and 0.5-1.2 parts of vinyl trimethoxy silane by weight, dispersing the silicon dioxide powder in 200 parts of ethanol solution by ultrasonic method, wherein the ultrasonic frequency is 45-60 kHz, and the dispersion time is 30-80 minutes, to obtain a mixed slurry A; adding polymethyl acrylate and vinyl trimethoxy silane to the mixed slurry A at the same time, stirring at a speed of 120 r / min for 1 hour, to obtain a mixed slurry B; evaporating and concentrating the mixed slurry B to obtain a mixed powder, melt-blending the mixed powder with 5-10 parts of sodium dodecylbenzene sulfonate at a melt-blending temperature of 105-125° C., cooling the product by using cooling water, and drying to obtain the modified polymethyl acrylate.

4. The cable for new energy vehicles according to claim 1, characterized in that: The method for preparing the flame retardant layer comprises: Step S21, weighing 50-70 parts of methyl vinyl silicone rubber, 20-25 parts of silicon dioxide powder, 15-22 parts of porcelain powder, 2-6 parts of zinc oxide, 3-7 parts of hydroxy siloxane, 40-60 parts of aluminum hydroxide powder, 10-12 parts of PE resin, 0.2-3 parts of hindered phenol antioxidant, 0.5-1.8 parts of vinyl tri(β-methoxyethoxy) silane, 1-5 parts of dye, and 0.3-1.5 parts of benzoyl peroxide by weight; mixing the above substances and mixing with the rubber material, the mixing temperature of the rubber material is 75-90° C., and obtaining a mixed crude material; Step S22, when the temperature of the mixed crude material is lower than 60°C, adding 0.3-1.5 parts of benzoyl peroxide to the mixed crude material to vulcanize the rubber material, stirring and mixing and heating to 200-320°C, the rubber material vulcanization time is 20-30 minutes; Step S23, kneading the vulcanized rubber material into a rough material, extruding the material at a temperature of 40-50° C., to obtain a flame retardant layer.

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