High-flexibility bending-resistant multi-core data communication control cable

Abstract

The invention relates to the technical field of control cables, and provides a high-flexibility bending-resistant multi-core data communication control cable. Comprising the following raw materials in parts by weight: 30-40 parts of silicone rubber, 30-40 parts of low-density polyethylene, 30-35 parts of ethylene propylene diene monomer, 30-40 parts of a filler, 5-8 parts of a thermoplastic elastomer, 2-3 parts of a cross-linking agent, 1-3 parts of an antioxidant, 4-6 parts of a plasticizer and 40-50 parts of a flame retardant. And the vertical tear strength of the thermoplastic elastomer is 61.2-80 KN / m. According to the technical scheme, the problem that a multi-core data communication control cable in the prior art is poor in flexibility and not resistant to bending is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of control cables, and specifically, to a highly flexible and bend-resistant multi-core data communication control cable. Background Art

[0002] In modern industrial automation, intelligent control systems, and various complex electronic device systems, control cables, as important carriers for connecting different devices and transmitting key control signals, play a decisive role in the stability and reliability of the entire system. As an important category of control cables, multi-core data communication control cables, each wire undertakes the task of transmitting specific control signals or data. With the acceleration of the digital and intelligent processes, the status of multi-core data communication control cables in the data transmission field has become increasingly crucial, and they are widely used in scenarios with extremely high requirements for data transmission speed, accuracy, and stability, such as communication systems, industrial automation control systems, rail transit signal systems, data centers, etc.

[0003] However, traditional multi-core data communication control cables have exposed problems of insufficient flexibility and bend resistance when facing increasingly complex application environments. In some scenarios where the cable needs to be frequently moved and bent, such as in the ceilings, wall cavities, and under floors of buildings, where the spatial layout is complex and the cable often needs to be bent, twisted, etc., or in movable communication base stations, etc., due to poor flexibility, ordinary cables are extremely prone to breakage during repeated bending. After breakage, it will directly cause the interruption of control signals or data transmission errors, making the equipment unable to operate normally, and may lead to the stagnation of the production line in industrial production, causing huge economic losses. Therefore, it is very necessary to develop a highly flexible and bend-resistant multi-core data communication control cable. Summary of the Invention

[0004] The present invention provides a highly flexible and bend-resistant multi-core data communication control cable, which solves the problems of poor flexibility and non-bend resistance of multi-core data communication control cables in related technologies.

[0005] The technical solution of the present invention is as follows: The present invention provides a highly flexible and bend-resistant multi-core data communication control cable, including a multi-core conductor and a sheath layer arranged in sequence from the inside to the outside. The sheath layer includes the following raw materials in parts by weight: 30 - 40 parts of silicone rubber, 30 - 40 parts of low-density polyethylene, 30 - 35 parts of ethylene propylene diene monomer rubber, 30 - 40 parts of filler, 5 - 8 parts of thermoplastic elastomer, 2 - 3 parts of cross-linking agent, 1 - 3 parts of antioxidant, 4 - 6 parts of plasticizer, and 40 - 50 parts of flame retardant; the vertical tear strength of the thermoplastic elastomer is 61.2 - 80 KN / m.

[0006] As a further technical solution, the multi-core conductor is formed by stranding single-core conductors, and each single-core conductor is composed of a wire bundle and an insulating layer extruded outside the wire bundle.

[0007] In the present invention, the independent insulating layer of the single-core conductor can effectively isolate the wire bundle, prevent interference between wires, ensure the stability and accuracy of data communication signal transmission, and greatly improve the communication quality of the cable. The multi-core conductor adopts the method of stranding single-core conductors, so that while maintaining the multi-core structure, the cable has better flexibility. Compared with the multi-core conductor with an integral structure, when subjected to external forces such as bending, each single-core conductor can deform more flexibly in coordination, reducing the risk of structural damage caused by excessive rigidity, and significantly enhancing the bending resistance of the cable.

[0008] As a further technical solution, the wire bundle is stranded by wires with a pitch diameter ratio of 20, and the material of the insulating layer is cross-linked polyethylene.

[0009] In the present invention, the wire bundle is stranded in a way with a pitch diameter ratio of 20, which can effectively reduce the mutual friction and extrusion between wires. When the cable is subjected to external tensile, bending or torsional forces, the wires can maintain a relatively stable positional relationship, reducing the possibility of wire breakage due to uneven stress, thus ensuring the stability of the internal electrical connection of the cable and extending the service life of the cable. The insulating layer uses cross-linked polyethylene material, which has excellent electrical insulation performance, can effectively isolate the wires, reduce the risk of leakage, and the cross-linked polyethylene has strong chemical stability, can withstand the erosion of various chemical substances, and can maintain good performance under different environmental conditions, enhancing the environmental adaptability of the cable.

[0010] As a further technical solution, the raw materials further include 3-5 parts of nano-carbon fiber.

[0011] As a further technical solution, the nano-carbon fiber is composed of porous nano-carbon fiber and graphitized nano-carbon fiber with a mass ratio of 2:1-5, for example, it can be 2:1, 2:2, 2:3, 2:4, 2:5, and preferably 2:2-3.

[0012] In the present invention, due to its highly ordered graphite crystal structure, the graphitized nano-carbon fiber has excellent thermal stability and high thermal conductivity, can quickly conduct heat, and reduce the risk of heat accumulation inside the cable caused by high temperature. The porous structure of the porous nano-carbon fiber is conducive to heat dispersion, and it has certain high-temperature resistance characteristics itself. The two work together, and when the cable is heated, they can dissipate heat efficiently in coordination, inhibiting the deterioration of material properties caused by high temperature. When the cable is in a high-temperature environment, the highly graphitized nano-carbon fiber dominates heat conduction, and the porous nano-carbon fiber assists in heat dispersion, ensuring the stable operation of each component inside the cable at high temperature, and significantly enhancing the high-temperature resistance of the cable.

[0013] As a further technical solution, the filler includes one or more of calcium carbonate, mica powder, carbon black, nano-calcined kaolin, talcum powder, wollastonite, preferably one or more of carbon black, nano-calcined kaolin, talcum powder, and further preferably nano-calcined kaolin.

[0014] In the present invention, the filler is added to the raw material of the sheath layer to enhance the mechanical properties of the cable sheath. When nano-calcined kaolin is used as the filler, due to its tiny particle size and extremely large specific surface area, it can be distributed among the polymer matrix in the cable sheath, providing a solid guarantee for the high flexibility, bending resistance and long-term stable operation of the cable. It can effectively improve the hardness and strength of the sheath layer, enabling the cable to better resist deformation and damage when subjected to external force extrusion, friction, etc., extending the service life of the cable. At the same time, it can also prevent cracks or damage from occurring easily in the sheath layer during the bending process of the cable, further enhancing the bending resistance performance of the cable.

[0015] As a further technical solution, the cross-linking agent includes one or more of dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide.

[0016] In the present invention, the addition of the cross-linking agent can efficiently initiate the cross-linking reaction between polymer molecular chains such as silicone rubber, low-density polyethylene, and ethylene propylene diene monomer rubber, making the originally linear molecular chains connect with each other to form a stable three-dimensional network structure, meeting the usage requirements of the high-flexibility and bending-resistant multi-core data communication control cable in complex environments.

[0017] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 168, antioxidant 1076.

[0018] In the present invention, the addition of the antioxidant has many benefits. From the perspective of extending the service life of the cable, during the use of the cable, the polymer materials in the sheath layer such as silicone rubber, low-density polyethylene, and ethylene propylene diene monomer rubber will inevitably undergo oxidation reactions with oxygen in the air. The addition of the antioxidant can prevent the thermal oxidative degradation of the polymer for a long time and effectively, thereby slowing down the aging rate of the sheath layer material, enabling the cable to maintain good physical and chemical properties for a long time, and greatly extending the service life of the cable; in terms of maintaining the stability of the cable mechanical properties, the addition of the antioxidant can effectively inhibit the thermal oxidative degradation of the polymer and the thermal degradation during the processing, ensuring that the cable can still maintain good bending resistance performance during long-term use and adapting to various complex installation and use environments.

[0019] As a further technical solution, the plasticizer includes one or more of dioctyl phthalate, butyl benzyl phthalate, dioctyl adipate.

[0020] In the present invention, the plasticizer can be inserted between the polymer molecular chains of the cable sheath layer, weakening the intermolecular force, effectively improving the flexibility and plasticity of the sheath material, enabling the cable to be easily bent during laying, adapting to various complex installation environments, greatly enhancing the high-flexibility characteristics of the cable, and the plasticizer can weaken the van der Waals force between polymer molecules, increasing the mobility of polymer molecular chains, making the raw material of the sheath layer flow more smoothly during the processing, facilitating production operations, and improving production efficiency.

[0021] As a further technical solution, the flame retardant includes one or more of zinc borate, magnesium hydroxide, aluminum hydroxide, and red phosphorus, preferably one or two of magnesium hydroxide and aluminum hydroxide.

[0022] In the present invention, both magnesium hydroxide and aluminum hydroxide are inorganic flame retardants, having excellent flame retardant properties. While enhancing the fire safety of the cable, they also have the characteristics of low smoke and non-toxicity, reducing the generation of smoke and toxic gases during a fire, creating favorable conditions for personnel evacuation and fire fighting and rescue, and effectively ensuring the safe and stable operation of the data communication control cable in complex environments.

[0023] The present invention also provides a method for preparing a high-flexibility and bend-resistant multi-core data communication control cable, comprising the following steps: S1. Stranding multiple wires to obtain a wire bundle, extruding an insulating layer on the surface of the wire bundle to obtain a single-core conductor, and stranding 2 to 5 single-core conductors with a pitch diameter ratio of 12 to form a multi-core conductor; S2. Mixing the silicone rubber, the low-density polyethylene, and the ethylene propylene diene monomer rubber to obtain a mixture A; S3. Adding the remaining raw materials to the mixture A, and obtaining a mixture B after mixing; S4. Extruding the mixture B on the surface of the multi-core conductor, and obtaining a multi-core data communication control cable after vulcanization.

[0024] As a further technical solution, the mixing time is 20 to 30 minutes.

[0025] As a further technical solution, the vulcanization temperature is 180 °C, and the vulcanization time is 10 minutes.

[0026] The working principle and beneficial effects of the present invention are as follows: In the present invention, the silicone rubber in the sheath layer has excellent flexibility and good electrical insulation properties. When combined with the excellent processing performance and flexibility of low-density polyethylene, and further combined with the excellent weather resistance, aging resistance and flexibility of ethylene propylene diene monomer (EPDM), the cable sheath has strong comprehensive properties, greatly improving the overall flexibility and bending resistance of the cable. The filler plays a role in strengthening the framework, and the addition of functional additives such as crosslinking agents, plasticizers, antioxidants and flame retardants ensures the overall integrity of the cable. The toughness of the material enables the outer sheath to undergo a certain degree of elastic deformation without cracking when subjected to bending stress, maintaining the integrity of its structure, while the strength ensures that the outer sheath will not undergo permanent deformation or fracture due to the stress during the bending process. Therefore, the vertical tear strength of the thermoplastic elastomer is in the range of 61.2 - 80 KN / m. On the premise of having a certain degree of softness, the cable can maintain its structural integrity under complex working conditions such as frequent bending and stretching, enhancing the flexibility and bending resistance of the control cable. Detailed implementation manners

[0027] The following will describe clearly and completely the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0028] In the following examples and comparative examples: Silicone rubber: 110-2 methyl vinyl silicone rubber; Low-density polyethylene: Model 2102TN00; Ethylene propylene diene monomer (EPDM): Model 4050; Conductor: The material is aluminum alloy; Insulation layer: The material is crosslinked polyethylene; Porous nano-carbon fiber: The diameter is 4.5 μm, and the size of the nano-pore diameter is 5 - 50 nm; Graphitized nano-carbon fiber: Highly graphitized nano-carbon fiber, with a length of 6 - 17 μm, an outer diameter ≤ 0.68 nm, a specific surface area of 12 - 16 m 2 / g, and the bulk density is 0.065 - 0.095 g / cm 3 , purchased from Shandong Xinjieneng Lithium Power Co., Ltd.

[0029] Example 1 A preparation method of a highly flexible and bend-resistant multi-core data communication control cable, comprising the following steps: S1. Strands are stranded to obtain a stranded wire bundle with a pitch diameter ratio of 20, an insulating layer is extruded on the surface of the stranded wire bundle to obtain a single-core conductor, and 2 single-core conductors are stranded with a pitch diameter ratio of 12 to form a multi-core conductor; S2. Mix 30 parts of silicone rubber, 30 parts of low-density polyethylene, and 30 parts of ethylene propylene diene monomer rubber to obtain mixture A; S3. Add 30 parts of nano-ceramic clay, 5 parts of thermoplastic elastomer (vertical tear strength is 61.2 KN / m, model is TPE TL-97-T0207G-87UV), 2 parts of dicumyl peroxide, 1 part of antioxidant 1010, 4 parts of dioctyl phthalate, and 40 parts of magnesium hydroxide to mixture A, and mix for 20 min to obtain mixture B; S4. Extrude mixture B on the surface of the multi-core conductor and vulcanize at 180 °C for 10 min to obtain a multi-core data communication control cable.

[0030] Example 2 A method for preparing a highly flexible and bend-resistant multi-core data communication control cable includes the following steps: S1. Strands are stranded to obtain a stranded wire bundle with a pitch diameter ratio of 20, an insulating layer is extruded on the surface of the stranded wire bundle to obtain a single-core conductor, and 4 single-core conductors are stranded with a pitch diameter ratio of 12 to form a multi-core conductor; S2. Mix 35 parts of silicone rubber, 35 parts of low-density polyethylene, and 32 parts of ethylene propylene diene monomer rubber to obtain mixture A; S3. Add 35 parts of nano-ceramic clay, 6 parts of thermoplastic elastomer (vertical tear strength is 61.2 KN / m, model is TPE TL-97-T0207G-87UV), 2.5 parts of benzoyl peroxide, 2 parts of antioxidant 168, 5 parts of butyl benzyl phthalate, and 45 parts of aluminum hydroxide to mixture A, and mix for 25 min to obtain mixture B; S4. Extrude mixture B on the surface of the multi-core conductor and vulcanize at 180 °C for 10 min to obtain a multi-core data communication control cable.

[0031] Example 3 A method for preparing a highly flexible and bend-resistant multi-core data communication control cable includes the following steps: S1. Strands are stranded to obtain a stranded wire bundle with a pitch diameter ratio of 20, an insulating layer is extruded on the surface of the stranded wire bundle to obtain a single-core conductor, and 5 single-core conductors are stranded with a pitch diameter ratio of 12 to form a multi-core conductor; S2. Mix 40 parts of silicone rubber, 40 parts of low-density polyethylene, and 35 parts of ethylene propylene diene monomer rubber to obtain mixture A; S3. Add 40 parts of nano-clay, 8 parts of thermoplastic elastomer (vertical tear strength is 61.2 KN / m, model TPE TL-97-T0207G-87UV), 3 parts of di-tert-butyl peroxide, 3 parts of antioxidant 1076, 6 parts of dioctyl adipate, and 50 parts of magnesium hydroxide to the mixture A, and obtain mixture B after kneading for 30 min; S4. Extrude and wrap mixture B on the surface of the multi-core conductor, and obtain the multi-core data communication control cable after vulcanizing at 180 °C for 10 min.

[0032] Example 4 Compared with Example 3, the difference in Example 4 is that the vertical tear strength of the thermoplastic elastomer is 80 KN / m, and the model is TPE TL-3260R.

[0033] Example 5 A preparation method of a highly flexible and bend-resistant multi-core data communication control cable includes the following steps: S1. Strands are stranded according to a pitch diameter ratio of 20 to obtain a strand bundle, an insulating layer is extruded and wrapped on the surface of the strand bundle to obtain a single-core conductor, and 5 single-core conductors are stranded according to a pitch diameter ratio of 12 to form a multi-core conductor; S2. Mix 40 parts of silicone rubber, 40 parts of low-density polyethylene, and 35 parts of ethylene propylene diene monomer rubber to obtain mixture A; S3. Add 40 parts of nano-clay, 8 parts of thermoplastic elastomer (vertical tear strength is 61.2 KN / m, model TPE TL-97-T0207G-87UV), 3 parts of di-tert-butyl peroxide, 3 parts of antioxidant 1076, 6 parts of dioctyl adipate, 50 parts of magnesium hydroxide, and 3 parts of nano-carbon fiber to mixture A, and obtain mixture B after kneading for 30 min; the nano-carbon fiber is a porous nano-carbon fiber.

[0034] S4. Extrude and wrap mixture B on the surface of the multi-core conductor, and obtain the multi-core data communication control cable after vulcanizing at 180 °C for 10 min.

[0035] Example 6 Compared with Example 5, the difference in Example 6 is that the addition amount of nano-carbon fiber is 5 parts.

[0036] Example 7 Compared with Example 6, the difference in Example 7 is that the nano-carbon fiber is a graphitized nano-carbon fiber.

[0037] Example 8 Compared with Example 6, the difference in Example 8 is that the nano-carbon fiber is composed of porous nano-carbon fiber and graphitized nano-carbon fiber with a mass ratio of 1:1.

[0038] Example 9 Compared with Example 6, Example 9 is different in that the nano-carbon fiber is composed of porous nano-carbon fiber and graphitized nano-carbon fiber with a mass ratio of 2:3.

[0039] Comparative Example 1 Compared with Example 3, Comparative Example 1 is different in that the vertical tear strength of the thermoplastic elastomer is 46.8 KN / m and the model is TPE IN-15056.

[0040] Comparative Example 2 Compared with Example 3, Comparative Example 2 is different in that the vertical tear strength of the thermoplastic elastomer is 90.8 KN / m and the model is TPE TELC 3050.

[0041] Experimental Example 1 For the multi-core data communication control cables prepared in Examples 1 to 4 and Comparative Examples 1 to 2, according to the test method specified in GB / T 5013.2-2008 "Rubber-insulated cables of rated voltages up to and including 450 / 750V - Part 2: Methods of test", a flexing test was carried out on the test specimens with a load of 1 kg and a pulley diameter of 80 mm.

[0042] The test results are shown in Table 1: Table 1 Performance test results of multi-core data communication control cables prepared in Examples 1 to 4 and Comparative Examples 1 to 2

[0043] As can be seen from Table 1, when the vertical tear strength of the thermoplastic elastomer is 61.2 - 80 KN / m, the flexible bending resistance performance of the multi-core data communication control cable is better.

[0044] Experimental Example 2 For the multi-core data communication control cables prepared in Example 3 and Examples 5 to 9, according to the test method specified in GB / T 2951.11-2008 "General test methods for insulating and sheathing materials of cables and optical cables - Part 11: General test methods - Measurement of thickness and overall dimensions - Mechanical properties test", the tensile strength of the test specimens was tested. Specimen preparation: Cut open the sheath along the axial direction of the cable, cut a narrow strip, and make a small dumbbell specimen with a thickness of 2.0 mm, which is the specimen to be tested; the specimen to be tested was subjected to aging treatment under the conditions of: aging at 200 °C for 168 h, and the tensile strength of the specimen after aging was tested.

[0045] The test results are shown in Table 2: Table 2 Performance test results of multi-core data communication control cables prepared in Example 3 and Examples 5 to 9

[0046] As can be seen from Table 2, the porous carbon nanofibers and graphitized carbon nanofibers play a synergistic role, which can improve the high-temperature resistance of the multi-core data communication control cable.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A highly flexible and bend-resistant multi-core data communication control cable, characterized in that, It includes a multi-core conductor and a sheath layer arranged from inside to outside in sequence. The sheath layer comprises the following raw materials in parts by weight: 30-40 parts of silicone rubber, 30-40 parts of low-density polyethylene, 30-35 parts of ethylene propylene diene monomer rubber, 30-40 parts of filler, 5-8 parts of thermoplastic elastomer, 2-3 parts of crosslinking agent, 1-3 parts of antioxidant, 4-6 parts of plasticizer, and 40-50 parts of flame retardant; the vertical tear strength of the thermoplastic elastomer is 61.2-80 KN / m.

2. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, characterized in that, The multi-core conductor is formed by stranding single-core conductors, and each single-core conductor consists of a wire bundle and an insulating layer extruded outside the wire bundle.

3. The high-flexibility and bend-resistant multi-core data communication control cable according to claim 2, wherein, The wire bundle is formed by stranding wires with a pitch diameter ratio of 20, and the material of the insulating layer is crosslinked polyethylene.

4. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, characterized in that, The raw materials further include 3-5 parts of nano-carbon fiber.

5. A highly flexible and bend-resistant multi-core data communication control cable according to claim 4, characterized in that, The nano-carbon fiber consists of porous nano-carbon fiber and graphitized nano-carbon fiber with a mass ratio of 2:1-5.

6. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, characterized in that, The filler includes one or more of carbon black, nano-clay, and talcum powder.

7. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, characterized in that, The crosslinking agent includes one or more of dicumyl peroxide, benzoyl peroxide, and di-tert-butyl peroxide.

8. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, wherein, The antioxidant includes one or more of antioxidant 1010, antioxidant 168, and antioxidant 1076.

9. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, characterized in that, The plasticizer includes one or more of dioctyl phthalate, butyl benzyl phthalate, and dioctyl adipate.

10. A highly flexible and bend-resistant multi-core data communication control cable according to claim 1, characterized in that, The flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

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