A high-strength cold-resistant cable and a manufacturing method thereof

Abstract

The present invention relates to a high-strength cold-resistant cable and a method for making the same, comprising the following steps: generating graphene in situ on one side of a fire-resistant belt to form a graphene layer; wrapping a wire core with the side of the fire-resistant belt facing away from the graphene layer to form a fire-resistant layer; coating the surface of the graphene layer with a cross-linked polyethylene insulation layer by an extrusion process, and making the cross-linked polyethylene insulation layer and the graphene layer bonded to each other to obtain a conductor; wrapping a plurality of conductors with a flame-retardant sheath to obtain a high-strength cold-resistant cable. In the above-mentioned manufacturing method, during the extrusion process, the molten cross-linked polyethylene solidifies on the surface of the graphene layer, and the graphene layer is bonded to the surface of the cross-linked polyethylene layer, thereby improving the mechanical strength of the cross-linked polyethylene layer. The graphene layer is dispersed on the surface of the cross-linked polyethylene insulation layer. On the one hand, it can disperse the charges accumulated on the cross-linked polyethylene insulation layer to prevent aging of the cross-linked polyethylene insulation layer, and on the other hand, it will not affect the insulation of the cross-linked polyethylene insulation layer.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a high-strength cold-resistant cable and a manufacturing method thereof. Background Art

[0002] A cable is a device used to transmit electrical energy or signals, usually consisting of several or several groups of wires. Each wire includes a core and an insulating layer that wraps the core, and the insulating layer is generally made of cross-linked polyethylene. As the use of cables increases, the requirements for the strength of the cables gradually increase. In the prior art, there is a solution to mix graphene into cross-linked polyethylene to improve the strength of the insulating layer, but graphene has strong conductivity and is easy to reduce the insulation performance of the insulating layer. Summary of the invention

[0003] Based on this, it is necessary to provide a high-strength cold-resistant cable and a manufacturing method thereof.

[0004] A method for manufacturing a high-strength cold-resistant cable comprises the following steps:

[0005] Graphene is generated in situ on one side of the refractory tape to form a graphene layer; wherein the current refractory tape is in the form of a tape, which is used to wrap around and wrap the surface of the wire core to form a refractory layer. The refractory tape includes at least one of a mica tape, a ceramic fiber tape, and a glass fiber tape. The refractory tapes of the above materials can all play a refractory role and can be conveniently wrapped around the surface of the wire core to form a refractory layer. Specifically, the refractory tape includes a fluorphlogopite mica tape, which has better electrical properties than ordinary mica tapes. After the refractory layer is formed, it is convenient to form graphene in situ on the surface of the refractory layer, so that the bonding force between the graphene and the refractory layer is better. The side of the refractory tape facing away from the graphene layer is wrapped around the wire core to form a refractory layer between the graphene layer and the wire core, thereby obtaining a wire core with a refractory layer and a graphene layer. At this time, the wire core, the refractory layer and the graphene layer are arranged in sequence from the inside to the outside. Specifically, the wire core is cylindrical, and the refractory tape is cylindrical and arranged to wrap the surface of the wire core. When the refractory tape is wrapped around the wire core, the graphene layer should be controlled to be arranged in a direction away from the wire core as much as possible, so as to facilitate the subsequent compounding with the cross-linked polyethylene insulation layer. It can be understood that the wire core can be realized by using materials and processes of the existing technology to play the role of a conductor. For example, the wire core includes a copper core, which has good conductivity and can be used as a conductor.

[0006] A cross-linked polyethylene insulation layer is coated on the surface of the graphene layer through an extrusion process, and the cross-linked polyethylene insulation layer is bonded to the graphene layer to obtain a conductor; specifically, cross-linked polyethylene is a substance in which polyethylene macromolecules are cross-linked under the action of high-energy rays (such as gamma rays, alpha rays, electron rays, etc.) or a cross-linking agent, and is widely used in the current cable field.

[0007] The high-strength cold-resistant cable is obtained by wrapping a plurality of the conductors with a flame-retardant sheath. The flame-retardant sheath has a flame-retardant function and can prevent the spread of fire. For example, the flame-retardant sheath is a polyvinyl chloride sheath, which has good mechanical properties and flame retardancy.

[0008] In the manufacturing method of the high-strength cold-resistant cable, in the extrusion process, the molten cross-linked polyethylene is solidified on the surface of the graphene layer, and the graphene layer is bonded to the surface of the cross-linked polyethylene layer, thereby improving the mechanical strength of the cross-linked polyethylene layer. The graphene layer is dispersed on the surface of the cross-linked polyethylene insulation layer, which can disperse the charges accumulated on the cross-linked polyethylene insulation layer to prevent aging of the cross-linked polyethylene insulation layer, and the graphene layer is only distributed on one side of the cross-linked polyethylene insulation layer, which will not affect the insulation of the cross-linked polyethylene insulation layer.

[0009] Specifically, the cross-linked polyethylene insulation layer does not contain graphene, and the cross-linked polyethylene insulation layer does not contain other conductive materials, so that the cross-linked polyethylene insulation layer has good insulation performance. After the charge conducted in the core reaches the graphene layer, it is blocked by the cross-linked polyethylene insulation layer, thereby avoiding the occurrence of leakage. Therefore, the graphene layer and the cross-linked polyethylene insulation layer of the present application are separately arranged, and the insulation performance of the cross-linked polyethylene insulation layer is maintained under the premise of enhancing the mechanical strength. It is also worth mentioning that the graphene layer generated in situ has a denser internal structure than the graphene layer generated by coating, and is less likely to fall off, and there is no adhesive between the graphene and the cross-linked polyethylene, so that the cross-linked polyethylene can better contact and compound with the graphene, so that the graphene layer and the cross-linked polyethylene layer have better bonding performance.

[0010] Preferably, the step of wrapping the plurality of conductors with a flame retardant sheath to obtain the high-strength cold-resistant cable comprises:

[0011] A cabling filler is filled between the conductors, and a plurality of the conductors and the cabling filler are wrapped with a flame retardant sheath to obtain the high-strength cold-resistant cable. Specifically, the conductors can be two, three, four, and so on. For example, the cabling filler includes PP rope, polyester tape, tin foil tape, spun yarn, glass fiber rope, and the like. These cabling fillers can well fill the gap between the flame retardant sheath and the conductors, so that the cable between the conductors and the cabling filler forms a cylindrical shape, which is beneficial for the subsequent wrapping of the flame retardant sheath on each conductor. For example, the cabling of the cabling filler and the conductor can be specifically realized by a wrapping process, so that the conductors and the cabling filler can be formed into a cylindrical shape, which is beneficial for the flame retardant sheath to wrap the conductors and the cabling filler, and the cable is evenly stressed in all directions, thereby improving the durability of the cable. For another example, the cabling process is realized by twisted wrapping, tape wrapping, and copper tape shielding wrapping, etc., which are not cumbersome to describe in this application.

[0012] Preferably, the thickness of the graphene layer is 10 to 50 nm. For example, the thickness of the graphene layer includes one of 10 nm, 20 nm, 30 nm, 40 nm and 50 nm. Too low a thickness cannot significantly improve the strength of the cross-linked polyethylene insulation layer, while too thick a graphene layer will cause the inner layer of the graphene layer to be unable to be well compounded with the cross-linked polyethylene insulation layer, and the bonding force between the atoms of the graphene in the inner layer is low, which can easily cause the graphene layer to be easily peeled off and cracked from the inner layer, thereby causing the cross-linked polyethylene insulation layer and the fire-resistant layer to peel off, reducing the service life of the wire. The thickness of the graphene layer is within the range of 10 to 50 nm, which can have enough graphene layers and cross-linked polyethylene insulation layers for compounding, and most of the graphene can be combined with the cross-linked polyethylene insulation layer, thereby improving the bonding force between the graphene layer and the cross-linked polyethylene insulation layer. Preferably, the thickness of the graphene layer is 30 nm, so that there is enough graphene for compounding and it is not easy to crack from the inside.

[0013] Preferably, the thickness of the cross-linked polyethylene insulation layer is 1.2 to 2 mm, for example, the thickness of the cross-linked polyethylene insulation layer is one of 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm and 2 mm. A cross-linked polyethylene insulation layer that is too thin cannot provide good insulation performance, while a cross-linked polyethylene insulation layer that is too thick will greatly increase the total width of the cable, which is not conducive to storage. It can be understood that each conductor has a cross-linked polyethylene layer, and a cross-linked polyethylene layer that is too thick will increase the diameter of each conductor, thereby increasing the overall diameter of the cable. This is particularly evident in cables with multiple conductors. The thickness of the cross-linked polyethylene insulation layer is 1.2 to 2 mm, which enables the cross-linked polyethylene insulation layer and the graphene layer to be well composited, achieving good insulation performance, and will not increase the diameter of the cable too much, avoiding the cable being too heavy and too large, thereby reducing the burden of laying and using, and facilitating storage and transfer.

[0014] Preferably, the thickness of the flame retardant sheath is 2 to 3 mm. A flame retardant sheath that is too thin cannot provide good flame retardant performance and has insufficient strength, while a flame retardant sheath that is too thick will greatly increase the total width of the cable, which is not conducive to storage.

[0015] Preferably, a tape layer is further provided between the flame retardant sheath and the conductor. The tape layer is one or two layers of tape wrapped around the outside of each conductor, so that the conductors are tightly and neatly wound together, which is conducive to the subsequent wrapping of the flame retardant sheath around the conductor. For example, the tape layer is made of materials such as polyimide film, polytetrafluoroethylene film, polyester film, nylon tape, etc., has good insulation properties and a small thickness, which makes the cable structure more compact and avoids the cable being too large.

[0016] Preferably, the number of the conductors is two, one of which is used to connect the live wire and the other is used to connect the neutral wire. This type of cable is commonly used in small household appliances. Specifically, the number of the conductors is three, that is, the cable is a three-core cable, and the three conductors are used to connect the live wire, the neutral wire and the ground wire, respectively, so that the cable is suitable for most larger household appliances, which are used in large quantities and have complex and changeable life scenes, and have high requirements for the mechanical properties of the cable. Therefore, it is very suitable for the cable of this application. Preferably, the cable is a four-core cable, and the number of conductors is four, that is, three conductors are used to connect the live wire and one conductor is used to connect the neutral wire.

[0017] Preferably, the cable is a five-core cable, and the number of conductors is five, that is, three conductors are used to connect the live wire, one conductor is used to connect the neutral wire, and one conductor is used to connect the ground wire. It can be understood that the number of conductors can be arranged according to actual needs.

[0018] Preferably, the cross-linked polyethylene content of the cross-linked polyethylene insulation layer is 85wt% to 95wt%. Within this range, the cross-linked polyethylene can be well compounded with the graphene of the graphene layer and maintain a high stability. Specifically, the cross-linked polyethylene insulation layer also includes 1 to 3wt% of a cross-linking agent, which is used to cross-link the polyethylene monomer to form cross-linked polyethylene. It can be understood that the cross-linked polyethylene insulation layer can be prepared using the formula and preparation method in the prior art. What is considered is to adjust the content of the cross-linked polyethylene component so that the cross-linked polyethylene insulation layer has sufficient cross-linked polyethylene and graphene for compounding under the premise of achieving good insulation performance. Therefore, other components can be configured according to actual production needs.

[0019] Preferably, the step of in-situ generating graphene on one side of the refractory belt to form a graphene layer comprises:

[0020] Cover one side of the refractory belt, heat the refractory belt under the protection of an inert gas atmosphere, and deliver a carbon source and a carrier gas to the surface of the refractory belt to generate a graphene layer in situ on one side of the refractory belt. In this way, the graphene layer is generated in situ on the refractory layer. Specifically, the covered side is not in contact with the carbon source and the carrier gas, so that no graphene layer is formed to avoid affecting the wire core, while the other side in contact with the carbon source and the carrier gas can form a graphene layer. For example, a release film is adhered to one side of the refractory belt, and the other side is exposed to the carbon source and the carrier gas, which is conducive to the carbon source generating a graphene layer on the exposed side of the refractory belt. After the reaction is completed, the release film is separated from the refractory belt, so as to form a graphene layer on one side of the refractory belt. For another example, a refractory belt is placed in a reaction tube, the wall of the reaction tube covers one side of the refractory belt, and the other side of the refractory belt is exposed, so that the carbon source and the carrier gas only contact the exposed side of the refractory belt, thereby forming a graphene layer on one side of the refractory belt.

[0021] Compared with winding the refractory tape around the wire core and then making graphene, the present application first makes graphene on the refractory tape and then winds it around the wire core to form a refractory layer, which can avoid heating the wire core and thus save energy.

[0022] Preferably, the carbon source includes methane, and the carrier gas includes hydrogen, both of which are relatively common carbon sources and carrier gases, and can form a graphene layer on the refractory layer. Specifically, the carbon source includes at least one of methane, ethylene and acetylene, and the carrier gas includes at least one of hydrogen, argon and nitrogen. The above carbon source and carrier gas can both generate graphene on one side of the refractory layer, thereby obtaining a graphene layer, and the types of carbon sources and carrier gases can be combined with each other without conflict.

[0023] Preferably, fluorphlogopite is used as the refractory belt and wraps the wire core to form a refractory layer. Fluorphlogopite can better serve as a substrate for graphene growth, so that graphene can be stably deposited on the refractory layer. Of course, the refractory layer can also be other substrates that can deposit graphene.

[0024] A high-strength cold-resistant cable is manufactured by the manufacturing method of the high-strength cold-resistant cable as described in any of the above embodiments. The high-strength cold-resistant cable manufactured by the above manufacturing method includes a flame-retardant sheath, a cabling filling layer and a plurality of conductors. The flame-retardant sheath wraps each conductor, and the cabling filling layer is arranged between the flame-retardant sheath and each conductor. Specifically, each of the conductors includes a core wire, a graphene layer and a cross-linked polyethylene insulation layer arranged in sequence from the inside to the outside, and the graphene layer is manufactured by an in-situ generation method. The graphene layer is bonded to the surface of the cross-linked polyethylene layer, thereby improving the mechanical strength of the cross-linked polyethylene layer. On the one hand, the accumulated charge on the cross-linked polyethylene insulation layer can be dispersed to prevent the aging of the cross-linked polyethylene insulation layer. On the other hand, the graphene layer is only distributed on one side of the cross-linked polyethylene insulation layer, and will not affect the insulation of the cross-linked polyethylene insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic flow chart of a method for manufacturing a high-strength cold-resistant cable according to an embodiment;

[0026] Figure 2 The present invention is a schematic structural diagram of a cable produced by a method for producing a high-strength cold-resistant cable according to an embodiment. DETAILED DESCRIPTION

[0027] For ease of understanding of the application, the application will be described more fully below. The application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the application more thorough and comprehensive.

[0028] like Figure 1 As shown, in one embodiment, a method for manufacturing a high-strength cold-resistant cable is provided, comprising the following steps:

[0029] S1, in-situ generating graphene on one side of the refractory belt to form a graphene layer.

[0030] S2, wrapping the wire core with the side of the refractory tape facing away from the graphene layer to form a refractory layer.

[0031] S3, coating the surface of the graphene layer with a cross-linked polyethylene insulation layer through an extrusion process, and making the cross-linked polyethylene insulation layer adhere to the graphene layer to obtain a wire.

[0032] S4, wrapping the plurality of the conductors with a flame retardant sheath to obtain the high-strength cold-resistant cable.

[0033] like Figure 2 As shown, in one embodiment, the high-strength cold-resistant cable 10 prepared by the above preparation method includes a flame-retardant sheath 300, a cabling filling layer 400 and three conductors 200, the three conductors are arranged in a "pin" shape, the flame-retardant sheath 300 wraps each conductor 200, and the cabling filling layer 400 is arranged between the flame-retardant sheath 300 and each conductor 200. Specifically, each of the conductors 200 includes a core wire 210, a graphene layer 220 and a cross-linked polyethylene insulation layer 230 arranged in sequence from the inside to the outside, and the graphene layer 220 is prepared by an in-situ generation method.

[0034] The above-mentioned high-strength cold-resistant cable and its manufacturing method, in the extrusion process, the molten cross-linked polyethylene is solidified on the surface of the graphene layer, and the graphene layer is combined with the surface of the cross-linked polyethylene layer, thereby improving the mechanical strength of the cross-linked polyethylene layer. The graphene layer is dispersed on the surface of the cross-linked polyethylene insulation layer. On the one hand, the accumulated charge on the cross-linked polyethylene insulation layer can be dispersed to prevent the aging of the cross-linked polyethylene insulation layer. On the one hand, the graphene layer is only distributed on one side of the cross-linked polyethylene insulation layer, which will not affect the insulation of the cross-linked polyethylene insulation layer. It is worth mentioning that since the thermal conductivity of graphene is higher than that of cross-linked polyethylene, if graphene is introduced into the cross-linked polyethylene insulation layer, when used in cold areas, the temperature of the conductor is easy to decrease as the ambient temperature decreases, so that the insulation layer is easy to continue in a low temperature state, affecting the strength. In the present application, the graphene layer is located inside, the cross-linked polyethylene insulation layer wraps the graphene layer, and the heat inside the conductor is evenly distributed through the graphene layer, and the cross-linked polyethylene insulation layer can save the heat of the internal core as much as possible, avoid the insulation layer temperature is too low, and improve the cold resistance of the high-strength cold-resistant cable.

[0035] The following are some specific embodiments:

[0036] Embodiment 1:

[0037] High-strength cold-resistant cables are made through the following steps:

[0038] A fluorphlogopite mica tape is used as a refractory tape, nitrogen is used as an inert gas, methane is used as a carbon source, and hydrogen is used as a carrier gas. The refractory tape is placed in a reaction tube, with the wall of the reaction tube covering one side of the refractory tape and the other side of the refractory tape exposed. The refractory tape is heated to 900° C. in a tubular furnace under the protection of a nitrogen atmosphere, and then methane and hydrogen in a volume ratio of 1:4 are introduced into the reaction tube, thereby in-situ generating graphene on one side of the refractory tape to form a graphene layer with a thickness of 10 nm.

[0039] Provide cross-sectional area of ​​120mm 2 The copper wire core has a refractory layer formed by coating the surface of the wire core with a refractory tape.

[0040] Using nitrogen as an inert gas, methane as a carbon source, and hydrogen as a carrier gas, a wire core with a refractory layer is placed in a reaction tube, and the refractory layer is heated to 900° C. in a tubular furnace under the protection of a nitrogen atmosphere, and then methane and hydrogen in a volume ratio of 1:4 are introduced into the reaction tube, thereby in-situ generating graphene on the surface of the refractory layer to obtain a graphene layer with a thickness of 10 nm;

[0041] By extrusion, a cross-linked polyethylene insulation layer with a thickness of 1.2 mm is coated on the surface of the graphene layer, and the cross-linked polyethylene insulation layer is bonded to the graphene layer to obtain a conductor, wherein the cross-linked polyethylene insulation layer includes 85 wt % silicone oil cross-linked polyethylene.

[0042] A 2mm thick polyvinyl chloride sheath is used as a flame retardant sheath, a glass fiber rope is used as a cabling filler, the cabling filler is filled between the conductors, and a plurality of the conductors and the cabling filler are wrapped with the flame retardant sheath to obtain the high-strength cold-resistant cable.

[0043] Embodiment 2:

[0044] A fluorphlogopite mica tape is used as a refractory tape, nitrogen is used as an inert gas, methane is used as a carbon source, and hydrogen is used as a carrier gas. The refractory tape is placed in a reaction tube, with the wall of the reaction tube covering one side of the refractory tape and the other side exposed. The refractory tape is heated to 1000° C. in a tubular furnace under the protection of a nitrogen atmosphere, and then methane and hydrogen are introduced into the reaction tube in a volume ratio of 1:4, thereby in-situ generating graphene on one side of the refractory tape to form a graphene layer with a thickness of 50 nm.

[0045] Provide cross-sectional area of ​​120mm 2 The copper wire core has a refractory layer formed by coating the surface of the wire core with a refractory tape.

[0046] By extrusion process, a cross-linked polyethylene insulation layer with a thickness of 2 mm is coated on the surface of the graphene layer, and the cross-linked polyethylene insulation layer is bonded to the graphene layer to obtain a conductor, wherein the cross-linked polyethylene insulation layer includes 95wt% silicone oil cross-linked polyethylene.

[0047] A 3mm thick polyvinyl chloride sheath is used as a flame retardant sheath, a glass fiber rope is used as a cabling filler, the cabling filler is filled between the conductors, and a plurality of the conductors and the cabling filler are wrapped with the flame retardant sheath to obtain the high-strength cold-resistant cable.

[0048] Embodiment 3:

[0049] A fluorphlogopite mica tape is used as a refractory tape, nitrogen is used as an inert gas, methane is used as a carbon source, and hydrogen is used as a carrier gas. The refractory tape is placed in a reaction tube, with the wall of the reaction tube covering one side of the refractory tape and the other side exposed. The refractory tape is heated to 950° C. in a tubular furnace under the protection of a nitrogen atmosphere, and then methane and hydrogen in a volume ratio of 1:4 are introduced into the reaction tube, thereby in-situ generating graphene on one side of the refractory tape to form a graphene layer with a thickness of 30 nm.

[0050] Provide cross-sectional area of ​​120mm 2 The copper wire core has a refractory layer formed by coating the surface of the wire core with a refractory tape.

[0051] By extrusion process, a cross-linked polyethylene insulation layer with a thickness of 1.4 mm is coated on the surface of the graphene layer, and the cross-linked polyethylene insulation layer is bonded to the graphene layer to obtain a conductor, wherein the cross-linked polyethylene insulation layer includes 90wt% silicone oil cross-linked polyethylene.

[0052] A 2.2mm thick polyvinyl chloride sheath is used as a flame retardant sheath, a glass fiber rope is used as a cabling filler, the cabling filler is filled between the conductors, and a plurality of the conductors and the cabling filler are wrapped with the flame retardant sheath to obtain the high-strength cold-resistant cable.

[0053] Comparative Example 1: The difference from Example 1 is that no graphene layer is provided, and the cross-linked polyethylene insulation layer is coated on the fire-resistant layer and directly bonded to the fire-resistant layer.

[0054] Comparative Example 2: The difference between Example 1 and Example 1 is that no graphene layer is provided, wherein the cross-linked polyethylene insulating layer comprises 85 wt % silicone oil cross-linked polyethylene and 5 wt % graphene, that is, graphene is added to the cross-linked polyethylene during the preparation process of the cross-linked polyethylene.

[0055] Comparative Example 3: The difference from Example 1 is that the graphene layer is prepared by the following method: graphene and PVDF binder are mixed in a ratio of 97:3 to prepare a slurry, and the slurry is applied to a refractory tape to form a graphene layer with a thickness of 10 nm.

[0056] Tensile test: Take two cable samples from each experimental group, cut 10cm, peel off the flame-retardant sheath and glass fiber rope with a cutter, take out the conductor, cut the cross-linked polyethylene insulation layer and fire-resistant layer along the axial direction to obtain the sample. Cut each sample to a length of 8cm, a width of 5mm and flatten it, place it on a tensile testing machine for testing, record the tensile strength and elongation at break of each experimental group, and take the average of the test results.

[0057] Tensile strength(Mpa) Elongation at break (%) Example 1 17.23 362.4 Example 2 17.45 364.8 Example 3 18.56 369.7 Comparative Example 1 13.25 342.5 Comparative Example 2 18.21 372.2 Comparative Example 3 15.05 255.1

[0058] The above test tests the tensile strength and elongation at break of each sample. By comparing the embodiments and comparative example 1, it can be seen that after adding the graphene layer, each embodiment has better tensile strength and elongation at break than comparative example 1. This is because the added graphene layer can be well compounded with the cross-linked polyethylene insulation layer, and is not easy to break during the stretching process. The composite layer formed by the surface of the cross-linked polyethylene insulation layer and the graphene layer also has better extensibility and better avoids breaking. Combined with comparative example 3, it can be seen that the graphene layer of comparative example 3 is prepared by coating. Although the tensile strength is increased, due to the poor uniformity of the graphene layer coating setting, it is not possible to form a complete network with the cross-linked polyethylene insulation layer, making the tensile strength and elongation at break of comparative example 3 worse than those of the embodiments.

[0059] It can be found from Examples 1-3 that the function of increasing the tensile strength of the insulation layer can be achieved within the range of each parameter, and the elongation at break is better, and the cable is not easy to break when stretched during use. And because the graphene layer is built between the fire-resistant layer and the cross-linked polyethylene layer, the cross-linked polyethylene insulation layer remains independent and has better insulation. In particular, in Example 3, the components have a better ratio, so that Example 3 has the best tensile performance and elongation at break, and the insulation layer has better tensile performance, thereby having higher strength.

[0060] The samples of Example 1 and Comparative Example 2 were obtained by the same method as above, and the volume resistivity of the cross-linked polyethylene insulation layer was tested according to the standard of GB / T22078.2-2008. The volume resistivity of Example 1 was 1.7×10 16 Ω·cm, the volume resistivity measured in Comparative Example 2 is 1.24×10 13Ω·cm, it can be seen that the volume resistivity of Example 1 is much higher than that of Comparative Example 2. In Comparative Example 2, mixing graphene into the cross-linked polyethylene insulation layer significantly reduces the insulation of the cross-linked polyethylene insulation layer, while the graphene layer and the cross-linked polyethylene layer in Example 1 are independently arranged to avoid the graphene affecting the insulation performance of the cross-linked polyethylene. Compared with the prior art, the strength of the cross-linked polyethylene insulation layer is increased while the cross-linked polyethylene insulation layer still has good insulation performance.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for manufacturing a high-strength cold-resistant cable, characterized in that: The steps include: In-situ generation of graphene on one side of a refractory belt to form a graphene layer, wherein one side of the refractory belt is covered, the refractory belt is heated under the protection of an inert gas atmosphere, and a carbon source and a carrier gas are delivered to the surface of the refractory belt to in-situ generate a graphene layer on one side of the refractory belt; Wrapping the wire core with the side of the refractory tape facing away from the graphene layer to form a refractory layer; The cross-linked polyethylene insulation layer is coated on the surface of the graphene layer by an extrusion process, and the cross-linked polyethylene insulation layer is bonded to the graphene layer. During the extrusion process, the molten cross-linked polyethylene is solidified on the surface of the graphene layer, and the graphene layer is bonded to the surface of the cross-linked polyethylene layer to obtain a conductor; The plurality of conductors are wrapped with a flame retardant sheath to obtain the high-strength cold-resistant cable.

2. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The step of wrapping the plurality of conductors with a flame retardant sheath to obtain the high-strength cold-resistant cable comprises: A cabling filler is filled between the conductors, and a plurality of the conductors and the cabling filler are wrapped with a flame retardant sheath to obtain the high-strength cold-resistant cable.

3. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The thickness of the graphene layer is 10-50 nm.

4. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The thickness of the cross-linked polyethylene insulation layer is 1.2-2 mm.

5. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The thickness of the flame retardant sheath is 2-3 mm.

6. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The number of the wires is three.

7. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The cross-linked polyethylene content of the cross-linked polyethylene insulation layer is 85wt%-95wt%.

8. The method for manufacturing a high-strength cold-resistant cable according to claim 1, characterized in that: The carbon source includes methane, and the carrier gas includes hydrogen.

9. A high-strength cold-resistant cable, characterized in that: The high-strength cold-resistant cable is manufactured by the manufacturing method of any one of claims 1 to 8.

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