A jumper cable for centralized transmission of signals between short-range devices and anti-electromagnetic interference

Abstract

The present invention relates to the field of electric wires and cables, and discloses a jumper cable for centralized transmission of jumper signals of short-range devices and anti-electromagnetic interference, comprising: a wire bundle; a shielding net wrapped on the wire bundle; a shielding layer wrapped on the shielding net; a connector, at least one end of which is electrically connected to the shielding net; a first injection-molded layer wrapped on the shielding layer and the connector; and a second injection-molded layer wrapped on the first injection-molded layer. The first injection-molded layer and the second injection-molded layer are formed by an injection molding process, the first injection-molded layer comprises surface-modified superconducting carbon black, and the second injection-molded layer comprises a nano-calcium carbonate / polystyrene composite material. The present invention improves the tensile strength and electromagnetic shielding performance of the jumper cable by forming a multi-shielding and double-layer plastic-sealed structure of the jumper cable in the injection molding process.

Description

Technical Field

[0001] The invention belongs to the technical field of electric wires and cables, and in particular relates to a jumper cable for centralized transmission of jumper signals of close-range devices and for resisting electromagnetic interference. Background Art

[0002] As crucial components for transmitting energy and signals, wires and cables are essential for the smooth operation of various industries and the advancement of science and technology. They are often described as the blood vessels and nerves of modern society. With technological advancements and the demands of social development, the installation of dozens or even hundreds of cables often results in multiple, intersecting wire harnesses, making installation difficult. The need for multiple signals between adjacent devices hinders installation due to the large number of connections and bulkiness of traditional shielded cables, which can affect close proximity. Furthermore, electromagnetic interference at cable joints can affect signal exchange. Furthermore, with the continuous development of sectors such as weaponry, shipbuilding, petrochemicals, power communications, rail transit, energy, and building electrical systems, the installation and service environments of wires and cables are becoming increasingly complex. To ensure reliable energy and signal transmission, the safety requirements for wires and cables are becoming increasingly stringent. High and low temperature resistance, fire resistance, and impact resistance are particularly important factors affecting their safety. Existing jumper cables often suffer from issues such as poor electromagnetic shielding, large footprint, and poor mechanical properties due to the lack of plastic encapsulation. Therefore, improving the transmission and safety performance of jumper cables is crucial for their design and application. Summary of the Invention

[0003] The purpose of the present invention is to provide a jumper cable for centralized transmission of signals between short-range devices and anti-electromagnetic interference, and to solve the following technical problems:

[0004] Existing jumper cables for centralized transmission of electromagnetic interference resistance for short-range device jumper signals have problems such as poor electromagnetic interference resistance, large connection volume, and poor mechanical properties.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A jumper cable for centralized transmission of signals across short-range devices and for resisting electromagnetic interference, comprising at least:

[0007] wire harness;

[0008] a shielding mesh wrapped around the wire bundle;

[0009] A shielding layer wrapped around the shielding net;

[0010] a connector, one end of which is at least electrically connected to the shielding mesh;

[0011] a first injection-molded layer, wrapped around the shielding layer and the connector;

[0012] a second injection-molded layer, wrapped around the first injection-molded layer;

[0013] wherein the first injection-molded layer and the second injection-molded layer are formed by an injection molding process, and the first injection-molded layer comprises surface-modified superconducting carbon black;

[0014] The second injection-molded layer comprises a nano-calcium carbonate / polystyrene composite material.

[0015] Preferably, the first injection molding layer comprises at least the following raw materials in parts by weight: 45-50 parts of SEBS rubber particles, 8-12 parts of polypropylene, 0.2-0.5 parts of antioxidant, 10-12 parts of filler oil and 15-20 parts of surface-modified superconducting carbon black.

[0016] Preferably, the preparation method of the first injection molding layer at least includes:

[0017] Put the superconducting carbon black into a high-speed mixer, heat it to 100-110°C, add titanate couple, stir at 1000-1200 rpm for 20-25 minutes, then discharge the mixture for use to obtain surface-modified superconducting carbon black;

[0018] Put the SEBS rubber particles and the filler oil into the mixing tank of the mixer, stir and mix them evenly, and then let them stand;

[0019] Then, the polypropylene, the antioxidant and the surface-modified superconducting carbon black are added to the mixing tank of the mixer and stirred until all the materials are evenly mixed;

[0020] A twin-screw extruder is used to perform a granulation process to obtain a first injection molding material.

[0021] Preferably, the second injection molding layer comprises at least the following raw materials in parts by weight: 50-60 parts of SEBS rubber particles, 8-12 parts of polypropylene, 10-12 parts of filler oil, 0.2-0.5 parts of antioxidant, 0.2-5 parts of lubricant and 10-20 parts of nano calcium carbonate / polystyrene composite material.

[0022] Preferably, the preparation method of the second injection molding layer at least includes:

[0023] The nano-calcium carbonate particles are dispersed in an organic solvent, a surface treatment agent is added dropwise under stirring, and an exchange reaction is carried out for 5-15 minutes. The organic solvent is removed by suction filtration, and the particles are dispersed in a styrene monomer. An initiator is added, and a free radical polymerization reaction is initiated at a temperature of 60-150° C. for 0.5-24 hours to obtain a nano-calcium carbonate / polystyrene composite material.

[0024] Put the SEBS rubber particles and the filler oil into the mixing tank of the mixer, stir and mix them evenly, and then let them stand;

[0025] Then, the polypropylene, the antioxidant, the lubricant and the nano-calcium carbonate / polystyrene composite material are added to the mixing tank of the mixer and stirred until all the materials are evenly mixed;

[0026] A twin-screw extruder was used to perform a granulation process to obtain a second injection-molded layer.

[0027] Preferably, the injection molding process of the first injection molding layer and the second injection molding layer at least includes:

[0028] Clamping and fixing a first injection mold on the outside of the wire harness with the connector, placing the first injection molding material in an injection molding machine for melting and processing, and injecting the first injection molding material into the first injection mold;

[0029] Cooling the first injection mold, and demoulding the mold after the first injection molding material solidifies to form the first injection molding layer;

[0030] Fixing the second injection mold, placing the second injection molding material in an injection molding machine for melting and processing, and injecting the second injection molding material into the second injection mold;

[0031] Cooling the second injection mold, and demoulding after the second injection material solidifies outside the first injection layer to form the second injection layer;

[0032] After surface treatment is performed on the second injection-molded layer, the injection molding process is completed to obtain a jumper cable that is resistant to electromagnetic interference and can centrally transmit jumper signals of short-range devices.

[0033] Preferably, the processing temperature of the injection molding machine for melting and processing the first injection molding material is 180-220°C, and the processing temperature of the injection molding machine for melting and processing the second injection molding material is 160-200°C.

[0034] Preferably, the shielding mesh is a braided copper mesh or a braided aluminum mesh.

[0035] Preferably, the shielding layer is a copper foil layer or an aluminum foil layer.

[0036] Beneficial effects of the present invention:

[0037] The present invention sets a shielding layer and a shielding net outside the wire bundle, the connector is at least electrically connected to the shielding net, a first injection molding layer and a second injection molding layer are set outside the shielding layer, and the first injection molding layer and the second injection molding layer wrap and cover the wire bundle and the connector, the shielding layer, the shielding net, the first injection molding layer and the second injection molding layer form a multi-layer shielding and double-layer plastic sealing structure, the obtained jumper cable has excellent tensile strength and electromagnetic shielding performance, and effectively avoids the problem of using traditional shielded cables to connect a large number of cables, a large volume, affecting close installation, and electromagnetic interference affecting signal exchange at the cable connection. Specifically, a braided metal shielding net is set outside the wire bundle because it has a low critical resistance and can resist electromagnetic interference. A metal shielding layer is set outside the shielding net to resist radio frequency interference. The shielding net and the shielding layer are set to wrap the wire bundle to effectively shield against mixed high and low frequency interference fields.

[0038] The present invention prepares an injection molding material by blending SEBS rubber particles and polypropylene. The plastic properties of polypropylene can improve the mechanical properties of the SEBS rubber particles. Polypropylene also has excellent processing properties. After blending with the SEBS rubber particles, the fluid viscosity of the modified material can be balanced, allowing the modified material to be used in injection molding. Surface-modified conductive carbon black is added to the first injection molding layer. The first injection molding layer covers the shielding layer and the connector, achieving a 360-degree closed overlap between the shielding layer and the electrical connector, thereby improving the electromagnetic shielding performance of the jumper cable. Furthermore, the injection molding process allows the first injection molding layer to almost completely adhere to the cable and connector, solving the problem of traditional shielding methods using shielding cards or tail covers, which require additional weight and installation space.

[0039] The present invention further provides a second injection molding layer, which is wrapped around the first injection molding layer. The first and second plastic sealing layers are made of the same base material, so the two layers have good weldability and are less likely to experience wire separation. A nano-calcium carbonate / polystyrene composite material is added to the second injection molding layer, and the nano-calcium carbonate / polystyrene composite material is dispersed in the second injection molding material, thereby enhancing the toughness and strength of the material, so that the obtained jumper cable has excellent tensile strength and elongation at break. The present invention reduces the problem of large volume of multiple cable connections by providing a multi-layer shielding structure and a double-layer plastic sealing structure, and provides a double-layer plastic sealing structure with different functions, thereby improving the shielding performance, transmission performance, and mechanical properties of the jumper cable. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] Example 1

[0042] The preparation method of the first injection molding material comprises the following steps:

[0043] 20 parts of conductive carbon black were placed in a high-speed mixer, heated to 100-110°C, and 0.4 parts of titanate hyperdispersant were slowly added at a stirring speed of 1000-1200 rpm. After stirring for 20-25 minutes, titanate-modified conductive carbon black was obtained.

[0044] Put 60 parts of SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil as filling oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0045] Then, 10 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant and 20 parts of titanate-modified superconducting carbon black were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed and then discharged;

[0046] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250° C. and a screw speed of 200-800 rpm. The material strands are extruded from the die head of the twin-screw extruder, cooled by cooling circulating water in a cooling water tank, and then drawn to a blower for air drying. The material strands are pelletized by a pelletizer to prepare a first injection molding material.

[0047] The preparation method of the second injection molding material comprises the following steps:

[0048] 15 parts of nano-calcium carbonate particles were dispersed in ethanol to a weight concentration of 30%, 0.3 parts of methacrylic acid as a surface treatment agent was added dropwise with stirring, and the exchange reaction was carried out for 5 minutes. The obtained nano-calcium carbonate / ethanol mixed system was filtered to remove the ethanol, and then dispersed in styrene monomer and stirred for 1 hour. Di-tert-butyl peroxide as an initiator was added, and a bulk polymerization reaction was carried out at a constant temperature of 110° C. for 4 hours to obtain a nano-calcium carbonate / polystyrene composite material;

[0049] Put 55 parts of weighed SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil as filling oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0050] Then, 15 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant, 3 parts of lubricant solid alkane wax mixture and 15 parts of nano calcium carbonate / polystyrene composite material were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed and then discharged;

[0051] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250°C and a screw speed of 200-800 rpm. The material strips are extruded from the die head of the twin-screw extruder and cooled by cooling circulating water in a cooling water tank. The strips are then pulled to a blower for air drying and pelletized by a pelletizer to obtain a second injection molding material.

[0052] A method for preparing a jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference comprises the following steps:

[0053] The first injection mold is clamped and fixed on the outside of the wire harness with the connector, and the first injection molding material is placed in an injection molding machine at a constant temperature of 195° C. for melting and processing, and then injected into the first injection mold;

[0054] Air-cooling the first injection mold, and demoulding after the first injection molding material solidifies to form a first injection molding layer;

[0055] Fix the second injection mold, place the second injection molding material in an injection molding machine at a constant temperature of 180° C. for melting and processing, and inject it into the second injection mold until the second injection molding material fills the second injection mold;

[0056] The second injection mold is air-cooled, and the second injection molded material is demoulded after solidifying outside the first injection molded layer to form a second injection molded layer;

[0057] After surface treatment is performed on the second injection-molded layer, the injection molding process is completed to obtain a jumper cable that is resistant to electromagnetic interference and can centrally transmit jumper signals of short-range devices.

[0058] Example 2

[0059] The preparation method of the first injection molding material comprises the following steps:

[0060] 15 parts of conductive carbon black were placed in a high-speed mixer, heated to 100-110°C, and 0.3 parts of a titanate hyperdispersant were slowly added at a stirring speed of 1000-1200 rpm. After stirring for 20-25 minutes, titanate-modified conductive carbon black was obtained.

[0061] Put 60 parts of SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil as filling oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0062] Then, 10 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant and 15 parts of titanate-modified superconducting carbon black were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed and then discharged;

[0063] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250° C. and a screw speed of 200-800 rpm. The material strands are extruded from the die head of the twin-screw extruder, cooled by cooling circulating water in a cooling water tank, and then drawn to a blower for air drying. The material strands are pelletized by a pelletizer to prepare a first injection molding material.

[0064] The preparation method of the second injection molding material comprises the following steps:

[0065] 20 parts of nano-calcium carbonate particles were dispersed in ethanol to a weight concentration of 30%, 0.5 parts of methacrylic acid as a surface treatment agent was added dropwise with stirring, and the exchange reaction was carried out for 5 minutes. The obtained nano-calcium carbonate / ethanol mixed system was filtered to remove the ethanol, and then dispersed in styrene monomer and stirred for 1 hour. Di-tert-butyl peroxide as an initiator was added, and a bulk polymerization reaction was carried out at a constant temperature of 110° C. for 4 hours to obtain a nano-calcium carbonate / polystyrene composite material;

[0066] Put 55 parts of weighed SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil as filling oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0067] Then, 10 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant, 4 parts of lubricant solid alkane wax mixture and 20 parts of nano calcium carbonate / polystyrene composite material were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed and then discharged;

[0068] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250°C and a screw speed of 200-800 rpm. The material strips are extruded from the die head of the twin-screw extruder and cooled by cooling circulating water in a cooling water tank. The strips are then pulled to a blower for air drying and pelletized by a pelletizer to obtain a second injection molding material.

[0069] Other components and preparation methods are the same as those in Example 1.

[0070] Example 3

[0071] The preparation method of the first injection molding material comprises the following steps:

[0072] 20 parts of conductive carbon black were placed in a high-speed mixer, and 0.4 parts of titanate hyperdispersant were slowly added under high-speed stirring, and pre-stirred and mixed at 70°C for 10 minutes to obtain titanate-modified conductive carbon black;

[0073] Put 60 parts of weighed SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0074] Then, 8 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant, 5 parts of lubricant solid alkane wax mixture and 20 parts of titanate-modified superconducting carbon black were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed and then discharged;

[0075] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250° C. and a screw speed of 200-800 rpm. The material strands are extruded from the die head of the twin-screw extruder, cooled by cooling circulating water in a cooling water tank, and then drawn to a blower for air drying. The material strands are pelletized by a pelletizer to prepare a first injection molding material.

[0076] The preparation method of the second injection molding material comprises the following steps:

[0077] 15 parts of nano-calcium carbonate particles were dispersed in ethanol to a weight concentration of 30%, 0.3 parts of methacrylic acid as a surface treatment agent was added dropwise with stirring, and the exchange reaction was carried out for 5 minutes. The obtained nano-calcium carbonate / ethanol mixed system was filtered to remove the ethanol, and then dispersed in styrene monomer and stirred for 1 hour. Di-tert-butyl peroxide as an initiator was added, and a bulk polymerization reaction was carried out at a constant temperature of 110° C. for 4 hours to obtain a nano-calcium carbonate / polystyrene composite material;

[0078] Put 60 parts of weighed SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0079] Then, 15 parts of polypropylene, 0.2 parts of antioxidant thiobisphenol antioxidant, 2 parts of lubricant solid alkane wax mixture and 15 parts of nano calcium carbonate / polystyrene composite material were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed and then discharged;

[0080] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250°C and a screw speed of 200-800 rpm. The material strips are extruded from the die head of the twin-screw extruder and cooled by cooling circulating water in a cooling water tank. The strips are then pulled to a blower for air drying and pelletized by a pelletizer to obtain a second injection molding material.

[0081] Other components and preparation methods are the same as those in Example 1.

[0082] Comparative Example 1

[0083] The preparation method of the first injection molding material comprises the following steps:

[0084] Put 60 parts of weighed SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0085] Then add 10 parts of polypropylene and 0.4 parts of antioxidant thiobisphenol antioxidant into the mixing tank of the high-speed mixer, stir rapidly for 2 minutes until all materials are mixed evenly, and then release;

[0086] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250° C. and a screw speed of 200-800 rpm. The material strands are extruded from the die head of the twin-screw extruder, cooled by cooling circulating water in a cooling water tank, and then drawn to a blower for air drying. The material strands are pelletized by a pelletizer to prepare a first injection molding material.

[0087] The preparation method of the second injection molding material comprises the following steps:

[0088] Put 55 parts of weighed SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0089] Then add 15 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant and 3 parts of lubricant solid alkane wax mixture into the mixing tank of the high-speed mixer, stir rapidly for 2 minutes until all materials are mixed evenly, and then release;

[0090] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250°C and a screw speed of 200-800 rpm. The material strips are extruded from the die head of the twin-screw extruder and cooled by cooling circulating water in a cooling water tank. The strips are then pulled to a blower for air drying and pelletized by a pelletizer to obtain a second injection molding material.

[0091] Other components and preparation methods are the same as those in Example 1.

[0092] Comparative Example 2

[0093] 10 parts of conductive carbon black were placed in a high-speed mixer, heated to 100-110°C, and 0.2 parts of titanate hyperdispersant were slowly added at a stirring speed of 1000-1200 rpm. After stirring for 20-25 minutes, titanate-modified conductive carbon black was obtained.

[0094] 10 parts of nano-calcium carbonate particles were dispersed in ethanol to a weight concentration of 30%, 0.2 parts of methacrylic acid was added dropwise with stirring, and the exchange reaction was carried out for 5 minutes. The obtained nano-calcium carbonate / ethanol mixture was filtered to remove the ethanol, and then dispersed in styrene monomer and stirred for 1 hour. Di-tert-butyl peroxide initiator was added, and bulk polymerization was carried out at a constant temperature of 110° C. for 4 hours to obtain a nano-calcium carbonate / polystyrene composite material;

[0095] Put 60 parts of SEBS rubber particles into the mixing tank of a 100L high-speed mixer and then pour in 10 parts of paraffin oil as filling oil. Use low-speed stirring to mix the paraffin oil and SEBS rubber particles evenly. Let it stand for more than 4 hours to allow SEBS to fully absorb the oil until there is no obvious visible flowing liquid phase filling oil in the tank.

[0096] Then, 15 parts of polypropylene, 0.4 parts of antioxidant thiobisphenol antioxidant, 3 parts of lubricant solid alkane wax mixture, 10 parts of nano calcium carbonate / polystyrene composite material and 20 parts of titanate-modified superconducting carbon black were added to the mixing tank of the high-speed mixer, and stirred rapidly for 2 minutes until all the materials were evenly mixed before being discharged;

[0097] The mixed material is placed into a twin-screw extruder for melt kneading and extrusion at an extrusion temperature of 180-250° C. and a screw speed of 200-800 rpm. The material strands are extruded from the die head of the twin-screw extruder, cooled by cooling circulating water in a cooling water tank, and then drawn to a blower for air drying. The material strands are pelletized by a pelletizer to obtain an injection molding material.

[0098] The injection mold is clamped and fixed on the outside of the wire harness with the connector, and the injection material is melted in an injection molding machine at a constant temperature of 195°C and injected into the injection mold until the injection mold is filled;

[0099] The injection mold is air-cooled and demoulded after the injection material solidifies to form an injection layer;

[0100] After surface treatment of the injection molding layer, the injection molding process is completed to obtain a jumper cable that is resistant to electromagnetic interference and can centrally transmit jumper signals of short-range devices.

[0101] Performance testing:

[0102] The injection molding materials of Examples 1-3 and Comparative Examples 1-2 were first dried at 90° C. for 1-2 hours, and then the test specimens were tested using an injection molding machine. After being fully stabilized at room temperature, various performance tests were performed. The test results are shown in Table 1:

[0103] Table 1 Statistics of jumper cable performance test data in Examples 1-3 and Comparative Example 2

[0104]

[0105] As can be seen from the data in Table 1, in Examples 1-3 of the present invention, by preparing the first injection molding material and the second injection molding material to form the first injection molding layer and the second injection molding layer on the wire harness and the connector, the jumper cable obtained has excellent tensile strength, elongation at break, tear strength and shielding performance. Among them, the first injection molding layer has excellent shielding performance, and the second injection molding layer has good tensile strength. In Comparative Example 1, the surface-modified conductive carbon black is not added to the first injection molding layer, and the nano calcium carbonate / polystyrene composite material is not added to the second injection molding layer. In Comparative Example 2, the surface-modified conductive carbon black and the nano calcium carbonate / polystyrene composite material are mixed to form a layer of injection molding, and the measured tensile strength, elongation at break, tear strength and shielding performance are all reduced, indicating that by setting the first injection molding layer and the second injection molding layer, the performance of the two materials can be fully utilized, and the tensile strength, elongation at break, tear strength and shielding performance of the jumper cable obtained can be effectively improved, and the shielding mesh and shielding layer on the jumper cable are combined to form a multi-shielding, double-layer plastic sealing effect.

[0106] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0107] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A jumper cable for centralized transmission of signals between short-range devices and anti-electromagnetic interference, characterized in that: At least: wire harness; a shielding mesh wrapped around the wire bundle; A shielding layer wrapped around the shielding net; a connector, one end of which is at least electrically connected to the shielding mesh; a first injection-molded layer, wrapped around the shielding layer and the connector; a second injection-molded layer, wrapped around the first injection-molded layer; Wherein, the first injection-molded layer and the second injection-molded layer are formed by an injection molding process; The first injection molding layer comprises at least the following raw materials in parts by weight: 45-50 parts of SEBS rubber particles, 8-12 parts of polypropylene, 0.2-0.5 parts of antioxidant, 10-12 parts of filler oil and 15-20 parts of surface-modified superconducting carbon black; The second injection molding layer comprises at least the following raw materials in parts by weight: 50-60 parts of SEBS rubber particles, 8-12 parts of polypropylene, 10-12 parts of filler oil, 0.2-0.5 parts of antioxidant, 0.2-5 parts of lubricant and 10-20 parts of nano calcium carbonate / polystyrene composite material.

2. The jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference according to claim 1, characterized in that: The preparation method of the first injection molding layer at least includes: Put the superconducting carbon black into a high-speed mixer, heat it to 100-110°C, add titanate couple, stir at 1000-1200 rpm for 20-25 minutes, then discharge the mixture for use to obtain surface-modified superconducting carbon black; Put the SEBS rubber particles and the filler oil into the mixing tank of the mixer, stir and mix them evenly, and then let them stand; Then, the polypropylene, the antioxidant and the surface-modified superconducting carbon black are added to the mixing tank of the mixer and stirred until all the materials are evenly mixed; A twin-screw extruder is used to perform a granulation process to obtain a first injection molding material.

3. The jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference according to claim 1, characterized in that: The preparation method of the second injection molding layer at least includes: The nano-calcium carbonate particles are dispersed in an organic solvent, a surface treatment agent is added dropwise under stirring, and an exchange reaction is carried out for 5-15 minutes. The organic solvent is removed by suction filtration, and the particles are dispersed in a styrene monomer. An initiator is added, and a free radical polymerization reaction is initiated at a temperature of 60-150° C. for 0.5-24 hours to obtain a nano-calcium carbonate / polystyrene composite material. Put the SEBS rubber particles and the filler oil into the mixing tank of the mixer, stir and mix them evenly, and then let them stand; Then, the polypropylene, the antioxidant, the lubricant and the nano-calcium carbonate / polystyrene composite material are added to the mixing tank of the mixer and stirred until all the materials are evenly mixed; A twin-screw extruder was used to perform a granulation process to obtain a second injection-molded layer.

4. The jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference according to claim 1, characterized in that: The injection molding process of the first injection molding layer and the second injection molding layer at least includes: Clamping and fixing a first injection mold on the outside of the wire harness with the connector, placing the first injection molding material in an injection molding machine for melting and processing, and injecting the first injection molding material into the first injection mold; Cooling the first injection mold, and demoulding the mold after the first injection molding material solidifies to form the first injection molding layer; Fixing the second injection mold, placing the second injection molding material in an injection molding machine for melting and processing, and injecting the second injection molding material into the second injection mold; Cooling the second injection mold, and demoulding after the second injection molding material solidifies outside the first injection molding layer to form the second injection molding layer; After surface treatment is performed on the second injection-molded layer, the injection molding process is completed to obtain a jumper cable that is resistant to electromagnetic interference and can centrally transmit jumper signals of short-range devices.

5. The jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference according to claim 4, characterized in that: The processing temperature of the injection molding machine for melting and processing the first injection molding material is 180-220°C, and the processing temperature of the injection molding machine for melting and processing the second injection molding material is 160-200°C.

6. The jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference according to claim 1, characterized in that: The shielding mesh is a braided copper mesh or a braided aluminum mesh.

7. The jumper cable for centralized transmission of short-range device jumper signals and anti-electromagnetic interference according to claim 1, characterized in that: The shielding layer is a copper foil layer or an aluminum foil layer.

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