Anti-interference oil-resistant wear-resistant control cable

Abstract

The invention relates to the technical field of cables, and provides an anti-interference, oil-resistant and wear-resistant control cable which sequentially comprises a cable core, a filling layer, a shielding layer and an outer protective layer from inside to outside. The outer protective layer comprises the following raw materials in parts by weight: 70-80 parts of polyolefin elastomer, 10-20 parts of ultra-high molecular weight polyethylene, 1-3 parts of antioxidant, 2-5 parts of wetting agent, 20-40 parts of flame retardant, 0.5-1 part of compatilizer and 15-30 parts of ethylene-acrylic acid copolymer composite nano silicon dioxide, and the shore hardness D of the ultra-high molecular weight polyethylene is 60-65. According to the technical scheme, the problem of poor wear resistance of the control cable in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and specifically, to an anti-interference, oil-resistant and wear-resistant control cable. Background Art

[0002] In the process of the rapid development of modern industry and technology, control cables, as key carriers for power and signal transmission, are widely used in various complex and harsh environments. The stable operation of these systems highly depends on the performance of control cables. As a key carrier for signal transmission, the reliability of cables is of crucial importance.

[0003] Traditional ordinary control cables expose many limitations when facing complex industrial environments. In some harsh working conditions, such as in mining and construction sites, the cables need to be frequently dragged, rubbed, and scratched by various sharp objects. The wear-resistant property of the outer sheath material of ordinary cables is poor, and under long-term external forces, it is extremely easy to appear wear, breakage, etc. Once the outer sheath is damaged, the internal conductors and insulation layers will be directly exposed, which may not only lead to signal transmission interruption, cause equipment failures, and affect the normal operation of the entire production process, but also may cause safety accidents due to problems such as short circuits. Currently, the outer sheath of cables mainly uses materials such as polypropylene and polyethylene. This material has advantages such as high strength and good toughness, but its wear-resistant property is poor. When facing continuous friction, its molecular structure is easily damaged, resulting in surface wear. Therefore, it is of great significance to develop a control cable with high wear-resistant performance. Summary of the Invention

[0004] The present invention provides an anti-interference, oil-resistant and wear-resistant control cable, which solves the problem of poor wear-resistant property of control cables in related technologies.

[0005] The technical solution of the present invention is as follows: The present invention provides an anti-interference, oil-resistant and wear-resistant control cable, which sequentially includes a cable core, a filling layer, a shielding layer, and an outer sheath from the inside to the outside. The cable core includes a conductor core and an insulation layer coated outside the conductor core. The outer sheath includes raw materials with the following parts by weight: 70 - 80 parts of polyolefin elastomer, 10 - 20 parts of ultra-high molecular weight polyethylene, 1 - 3 parts of antioxidant, 2 - 5 parts of wetting agent, 20 - 40 parts of flame retardant, 0.5 - 1 part of compatibilizer, and 15 - 30 parts of ethylene-acrylic copolymer composite nano-silica. The Shore hardness D of the ultra-high molecular weight polyethylene is 60 - 65.

[0006] As a further technical solution, the parts by weight of the polyolefin elastomer are preferably 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, and more preferably 75 parts; The parts by weight of the ultra-high molecular weight polyethylene are preferably 10 parts, 15 parts, 20 parts, and more preferably 15 parts; The weight parts of the flame retardant are preferably 20 parts, 30 parts, 40 parts, and more preferably 30 parts; The weight parts of the ethylene-acrylic acid copolymer composite nano-silica are preferably 15 parts, 23 parts, 30 parts, and more preferably 23 parts.

[0007] As a further technical solution, the raw materials of the ethylene-acrylic acid copolymer composite nano-silica include nano-silica, amino-silane coupling agent, and ethylene-acrylic acid copolymer.

[0008] In the present invention, nano-silica has an extremely high specific surface area and surface energy. When subjected to external frictional force, it can serve as a stress concentration point to disperse the externally applied stress and avoid premature wear of the material caused by excessive local stress. At the same time, nano-silica can form physical entanglements with the polyolefin elastomer matrix, enhancing the overall strength and toughness of the matrix material, making it more difficult for the material to be damaged during the friction process, thereby improving the wear resistance; one end of the amino-silane coupling agent molecule contains an amino active group, and the other end contains a siloxy group. The siloxy group hydrolyzes into a silanol group in water and can form a hydrogen bond with the hydroxyl group on the surface of nano-silica, while the amino group can bind to the carboxyl group in the ethylene-acrylic acid copolymer through a hydrogen bond. The ethylene-acrylic acid copolymer has a certain flexibility, and the acrylic acid unit in its molecular structure has good adhesion performance, which helps the nano-silica to tightly combine with the polyolefin elastomer matrix material, further improving the wear resistance of the outer protective layer.

[0009] As a further technical solution, the content of acrylic acid in the ethylene-acrylic acid copolymer is 10wt% - 15wt%.

[0010] In the present invention, acrylic acid in the ethylene-acrylic acid copolymer can form hydrogen bonds with active groups such as hydroxyl groups and amino groups, thereby improving the binding force between nano-silica and other raw materials in the outer protective layer and enhancing the mechanical properties of the outer protective layer. However, when the content of acrylic acid is too high, the rigidity of the polymer is insufficient and the melt strength is reduced, while when the content is too low, the adhesion force to the matrix is reduced, weakening the binding force between nano-silica and the matrix material. Through experiments, it is found that when the content of acrylic acid in the ethylene-acrylic acid copolymer is 10wt% - 15wt%, the material can maintain rigidity and ensure a strong binding force between nano-silica and the matrix material, thereby improving the tensile strength of the outer protective layer.

[0011] As a further technical solution, the mass ratio of the nano-silica, amino-silane coupling agent, and ethylene-acrylic acid copolymer is 20:2:1 - 2.

[0012] As a further technical solution, the amino-silane coupling agent includes one of silane coupling agent KH-550 and silane coupling agent KH-792.

[0013] As a further technical solution, the preparation method of the wear-resistant agent comprises the following steps: A1. Adding nano-silica and amino-silane coupling agent into a first solvent for the first mixing, and drying to obtain pretreated nano-silica; A2. Adding the pretreated nano-silica and ethylene-acrylic acid copolymer into a second solvent for the second mixing, and drying to obtain the wear-resistant agent.

[0014] In the present invention, by mixing nano-silica, amino-silane coupling agent, and ethylene-acrylic acid copolymer step by step, in the first mixing, the amino-silane coupling agent can fully contact with nano-silica to form a stable bond. When adding the ethylene-acrylic acid copolymer for the second mixing, the amino group at the other end of the coupling agent can combine with the carboxyl group in the ethylene-acrylic acid copolymer. The ethylene in the ethylene-acrylic acid copolymer has high compatibility with polyolefin elastomer and ultra-high molecular weight polyethylene through the principle of like dissolves like, thereby improving the bonding force between nano-silica and the substrate; if nano-silica, amino-silane coupling agent, and ethylene-acrylic acid copolymer are mixed simultaneously, the presence of the ethylene-acrylic acid copolymer will affect the combination of the amino-silane coupling agent and nano-silica, reducing the dispersibility of nano-silica, and further reducing the wear resistance of the outer protective layer.

[0015] As a further technical solution, the first solvent is water; the second solvent is N,N-dimethylformamide.

[0016] As a further technical solution, the temperature of the first mixing is 30 - 40 °C, and the time of the first mixing is 30 - 60 min.

[0017] As a further technical solution, the temperature of the second mixing is 80 - 90 °C, and the time of the second mixing is 2 - 4 h.

[0018] As a further technical solution, the antioxidant includes one or more of antioxidant 2246, antioxidant 1010, antioxidant 1024, antioxidant 168, and antioxidant 1076.

[0019] In the present invention, the types of antioxidants mainly include hindered phenol antioxidants and phosphite antioxidants. The hindered phenol antioxidants include antioxidant 2246, antioxidant 1010, antioxidant 1024, and antioxidant 1076. Their molecular structures contain hindered phenol groups, where the phenolic hydroxyl groups can provide active hydrogen atoms. When the material is oxidized, free radicals can be generated to capture the hydrogen atoms of the phenolic hydroxyl groups, forming stable phenoxy free radicals and interrupting the free radical chain reaction, thereby inhibiting oxidation. Antioxidant 168 is a phosphite antioxidant, which mainly decomposes the hydroperoxides generated by the oxidation of the material and converts them into stable non-free radical products. By compounding and using hindered phenol antioxidants and phosphite antioxidants, synergistic effects can be achieved to further improve the antioxidant ability and enhance the overall antioxidant performance of the material.

[0020] As a further technical solution, when the antioxidant is antioxidant 1076 and antioxidant 168, the mass ratio of antioxidant 1076 to antioxidant 168 is 2:1.

[0021] In the present invention, by compounding and using hindered phenol antioxidants and phosphite antioxidants, the antioxidant performance is improved. The optional combinations are antioxidant 2246 and antioxidant 168, antioxidant 1010 and antioxidant 168, antioxidant 1076 and antioxidant 168, and the preferred combination is antioxidant 1076 and antioxidant 168; the mass ratio of antioxidant 1076 to antioxidant 168 is 1 to 5:1, preferably 2 to 3:1, and more preferably 2:1.

[0022] As a further technical solution, the polyolefin elastomer includes ethylene-1-octene copolymer and ethylene-butene copolymer.

[0023] In the present invention, the polyolefin elastomer is a thermoplastic elastomer formed by in-situ polymerization of ethylene and α-olefins (such as 1-butene, 1-hexene, 1-octene, etc.) using a metallocene catalyst. It has the dual characteristics of plastics and rubbers. The crystalline regions of the polyethylene chains serve as physical cross-linking points, endowing it with plastic properties; while the addition of α-olefins weakens the crystalline regions and forms amorphous regions, giving it rubber elasticity. Among them, in the ethylene-1-octene copolymer, the longer octene side chains endow it with excellent flexibility and impact resistance, and the ethylene-butene copolymer has excellent elasticity. Compounding the ethylene-1-octene copolymer and the ethylene-butene copolymer as the base material of the outer protective layer can make the outer protective layer have good flexibility, elasticity, and impact resistance.

[0024] As a further technical solution, the mass ratio of the ethylene-1-octene copolymer to the ethylene-butene copolymer is 1:4 to 7; preferably 1:4, 1:5, 1:6, 1:7.

[0025] As a further technical solution, the wetting agent includes one or more of zinc stearate, polyethylene wax, and calcium stearate; The flame retardant includes one or more of aluminum hydroxide, melamine, and triphenyl phosphate; The compatibilizer includes one or two of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene.

[0026] In the present invention, the addition of the wetting agent can reduce the interfacial tension between the solid particles and the polyolefin elastomer substrate, enabling them to be evenly dispersed in the matrix. The wetting agent can also improve the melt fluidity of the outer sheath. During the extrusion process, the melt can flow more smoothly, reducing internal stress concentration, lowering the probability of product defects, and ensuring the stability of product quality.

[0027] The flame retardant can effectively improve the fire safety performance of the outer sheath. When aluminum hydroxide is heated, it undergoes a decomposition reaction, releasing crystal water. The vaporization of water further absorbs heat, while diluting the oxygen and combustible gas concentrations in the combustion area, playing a role in suppressing combustion. In addition, the aluminum oxide formed by the decomposition of aluminum hydroxide will form a dense protective film on the material surface, isolating the transfer of oxygen and heat, and preventing the material from further burning; when melamine is heated, it decomposes into ammonia and cyanuric acid. Ammonia can dilute the oxygen and combustible gas concentrations in the combustion area, inhibiting the continuous progress of the combustion reaction at the source. Cyanuric acid will further polymerize to form a heat-insulating structure, building an insulating layer on the material surface to block the heat conduction into the material interior and slow down the combustion speed; triphenyl phosphate decomposes into phosphoric acid and phenol and other products when heated. Phosphoric acid can promote the dehydration and carbonization of the material surface, forming a carbonaceous layer with heat-insulating and oxygen-isolating properties, which can effectively prevent the heat from being transferred into the material interior and slow down the combustion speed.

[0028] In the sheath layer, due to the different molecular structures and properties between different polymers, the compatibility is poor and phase separation is likely to occur. The addition of the compatibilizer can effectively solve the problem of poor compatibility between different polymers. Among them, the maleic anhydride groups in maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene have strong polarity, can interact with other raw materials in the outer sheath, establish connections, enhance the interfacial bonding force, make each phase tightly combined, reduce the phase separation phenomenon, and improve the stability of the outer sheath.

[0029] The present invention also proposes a preparation method for an anti-interference, oil-resistant, and wear-resistant control cable for preparing the described anti-interference, oil-resistant, and wear-resistant control cable, including the following steps: S1. Stranding the copper conductors to obtain a core, and extruding a polyethylene material on the outside of the core to form an insulating layer to obtain a cable core; S2. Stranding the cable cores into a cable, and filling it with a polyvinyl chloride material to form a filling layer; S3. Wrap the copper tape around the outside of the filling layer to form a shielding layer, obtaining a semi-finished control cable; S4. After mixing the raw materials for the outer sheath, extrude them onto the outside of the semi-finished control cable to obtain an anti-interference, oil-resistant and wear-resistant control cable.

[0030] The working principle and beneficial effects of the present invention are as follows: In the present invention, polyolefin elastomer is used as the main matrix material, which has good flexibility and elasticity, can buffer external frictional force and reduce wear. By adding ultra-high molecular weight polyethylene, its long molecular chain structure makes the intermolecular interaction strong when it is subjected to friction and is not easily damaged; the nano-silica in the ethylene-acrylic acid copolymer composite nano-silica has extremely high hardness and rigidity, which can effectively enhance the surface hardness of the outer sheath material, making it more resistant to friction and reducing surface damage caused by friction. The ethylene-acrylic acid copolymer itself has good flexibility and elasticity. After the two are compounded, while ensuring hardness and toughness, the wear resistance of the material is also improved, so that the cable outer sheath can still maintain good wear resistance in the face of various friction environments during long-term use, effectively extending the service life of the cable. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0032] In the following embodiments and comparative examples: Ultra-high molecular weight polyethylene of model UHMWPE U050 H, Shore hardness D is 60; ultra-high molecular weight polyethylene of model UHMWPE XM-221U, Shore hardness D is 65; ethylene-acrylic acid copolymer of model EAA 5020, acrylic acid content is 7.5wt%; ethylene-acrylic acid copolymer of model EAA 5080, acrylic acid content is 10wt%; ethylene-acrylic acid copolymer of model EAA5200, acrylic acid content is 15wt%; ethylene-acrylic acid copolymer of model EAA 5990, acrylic acid content is 22wt%; nano-silica, particle size 50nm; ethylene-1-octene copolymer, model: POE 8105; ethylene-butene copolymer, model: POE 7467; maleic anhydride grafted polyethylene, model: Fusabond E226; maleic anhydride grafted polypropylene, model: ADMER QB510; polyethylene wax, model: H110.

[0033] Example 1 A preparation method of an anti-interference, oil-resistant and wear-resistant control cable, comprising the following steps: S1. Stranding 6 copper conductors to obtain a core, and extruding a polyethylene material on the outer side of the core to form an insulating layer to obtain a cable core; S2. Stranding 3 cable cores to form a cable, and filling it by adding a polyvinyl chloride material to form a filling layer; S3. Wrapping a copper tape around the outer side of the filling layer to form a shielding layer to obtain a semi-finished control cable; S4. Mixing 14 parts of ethylene-1-octene copolymer, 56 parts of ethylene-butene copolymer, 10 parts of ultra-high molecular weight polyethylene UHMWPE U050 H, 1 part of antioxidant 1010, 2 parts of zinc stearate, 20 parts of aluminum hydroxide, 0.5 part of maleic anhydride grafted polyethylene, and 15 parts of ethylene-acrylic acid copolymer composite nano-silica, and then extruding it on the outer side of the semi-finished control cable to form an outer sheath to obtain an anti-interference, oil-resistant and wear-resistant control cable; A preparation method of ethylene-acrylic acid copolymer composite nano-silica, comprising the following steps: adding 40 g of nano-silica and 2 g of ethylene-acrylic acid copolymer EAA 5020 to 50 g of N,N-dimethylformamide, mixing at 80 °C for 4 h, and then drying to obtain ethylene-acrylic acid copolymer composite nano-silica.

[0034] Example 2 A preparation method of an anti-interference, oil-resistant and wear-resistant control cable, comprising the following steps: S1. Stranding 6 copper conductors to obtain a core, and extruding a polyethylene material on the outer side of the core to form an insulating layer to obtain a cable core; S2. Stranding 3 cable cores to form a cable, and filling it by adding a polyvinyl chloride material to form a filling layer; S3. Wrapping a copper tape around the outer side of the filling layer to form a shielding layer to obtain a semi-finished control cable; S4. Mixing 12 parts of ethylene-1-octene copolymer, 63 parts of ethylene-butene copolymer, 15 parts of ultra-high molecular weight polyethylene UHMWPE XM-221U, 2 parts of antioxidant 1024, 4 parts of polyethylene wax, 30 parts of melamine, 0.8 part of maleic anhydride grafted polypropylene, and 21 parts of ethylene-acrylic acid copolymer composite nano-silica, and then extruding it on the outer side of the semi-finished control cable to form an outer sheath to obtain an anti-interference, oil-resistant and wear-resistant control cable; A preparation method of ethylene-acrylic acid copolymer composite nano-silica, comprising the following steps: adding 40 g of nano-silica and 2 g of ethylene-acrylic acid copolymer EAA 5020 to 50 g of N,N-dimethylformamide, mixing at 85 °C for 3 h, and then drying to obtain ethylene-acrylic acid copolymer composite nano-silica.

[0035] Example 3 A preparation method of an anti-interference, oil-resistant and wear-resistant control cable, comprising the following steps: S1. Stranding 6 copper conductors to obtain a core, and extruding a polyethylene material on the outer side of the core to form an insulating layer, thereby obtaining a cable core; S2. Stranding 3 cable cores to form a cable, and filling it with a polyvinyl chloride material to form a filling layer; S3. Wrapping a copper tape around the outer side of the filling layer to form a shielding layer, thereby obtaining a semi-finished control cable; S4. Mixing 10 parts of ethylene-1-octene copolymer, 70 parts of ethylene-butene copolymer, 20 parts of ultra-high molecular weight polyethylene UHMWPE XM-221U, 2 parts of antioxidant 1076, 1 part of antioxidant 168, 5 parts of calcium stearate, 40 parts of triphenyl phosphate, 1 part of maleic anhydride grafted polypropylene, and 30 parts of ethylene-acrylic acid copolymer composite nano-silica, and then extruding the mixture on the outer side of the semi-finished control cable to form an outer protective layer, thereby obtaining an anti-interference, oil-resistant and wear-resistant control cable; A preparation method of ethylene-acrylic acid copolymer composite nano-silica, comprising the following steps: adding 40 g of nano-silica and 4 g of ethylene-acrylic acid copolymer EAA 5020 into 50 g of N,N-dimethylformamide, mixing at 90 °C for 2 h, and then drying to obtain ethylene-acrylic acid copolymer composite nano-silica.

[0036] Example 4 Compared with Example 2, the difference in this example is only that the preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps: A1. Adding 40 g of nano-silica and 4 g of silane coupling agent KH-550 into water, mixing at 30 °C for 30 min, and then drying to obtain pretreated nano-silica; A2. Adding the pretreated nano-silica and 2 g of ethylene-acrylic acid copolymer EAA 5020 into 50 g of N,N-dimethylformamide, mixing at 85 °C for 3 h, and then drying to obtain ethylene-acrylic acid copolymer composite nano-silica.

[0037] Example 5 Compared with Example 2, the difference in this example is only that the preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps: A1. Adding 40 g of nano-silica and 4 g of silane coupling agent KH-792 into water, mixing at 40 °C for 60 min, and then drying to obtain pretreated nano-silica; A2. Adding the pretreated nano-silica and 4 g of ethylene-acrylic acid copolymer EAA 5020 into 50 g of N,N-dimethylformamide, mixing at 85 °C for 3 h, and then drying to obtain ethylene-acrylic acid copolymer composite nano-silica.

[0038] Example 6 This example is only different from Example 5 in that the ethylene-acrylic acid copolymer EAA 5020 is replaced with an equal amount of ethylene-acrylic acid copolymer EAA 5990.

[0039] Example 7 This example is only different from Example 5 in that the ethylene-acrylic acid copolymer EAA 5020 is replaced with an equal amount of ethylene-acrylic acid copolymer EAA 5080.

[0040] Example 8 This example is only different from Example 5 in that the ethylene-acrylic acid copolymer EAA 5020 is replaced with an equal amount of ethylene-acrylic acid copolymer EAA 5200.

[0041] Comparative Example 1 This comparative example is only different from Example 2 in that in step S4, 12 parts of ethylene-1-octene copolymer, 63 parts of ethylene-butene copolymer, 15 parts of ultra-high molecular weight polyethylene UHMWPE XM-221U, 2 parts of antioxidant 1024, 4 parts of polyethylene wax, 30 parts of melamine, 0.8 parts of maleic anhydride grafted polypropylene, 1 part of ethylene-acrylic acid copolymer, and 20 parts of nano-silica are mixed and then extruded and coated on the outside of the control cable semi-finished product to form an outer sheath, obtaining an anti-interference, oil-resistant and wear-resistant control cable.

[0042] Comparative Example 2 This comparative example is only different from Example 2 in that the ethylene-acrylic acid copolymer composite nano-silica is replaced with an equal amount of nano-silica.

[0043] Comparative Example 3 This comparative example is only different from Example 2 in that ultra-high molecular weight polyethylene UHMWPE XM-221U is not added.

[0044] Comparative Example 4 This comparative example is only different from Example 2 in that in step S4, 12 parts of ethylene-1-octene copolymer, 63 parts of ethylene-butene copolymer, 15 parts of ultra-high molecular weight polyethylene UHMWPE XM-221U, 2 parts of antioxidant 1024, 4 parts of polyethylene wax, 30 parts of melamine, 0.8 parts of maleic anhydride grafted polypropylene, 1 part of silane coupling agent KH-550, 1 part of ethylene-acrylic acid copolymer, and 20 parts of nano-silica are mixed and then extruded and coated on the outside of the control cable semi-finished product to form an outer sheath, obtaining an anti-interference, oil-resistant and wear-resistant control cable.

[0045] Experimental Example 1 The outer sheaths of the anti-interference, oil-resistant and wear-resistant control cables prepared in Examples 1-5 and Comparative Examples 1-4 were axially cut, and a narrow strip was taken to prepare a strip-shaped specimen. The mass wear of the outer sheaths was tested according to the method in GB / T 3960-2016 "Plastics - Methods of test for sliding friction and wear". Test conditions: test ring rotation speed 200 r / min, test time 2 h, load 196 N. The test results are shown in Table 1.

[0046] Table 1 Test results of wear resistance of the outer sheaths of control cables

[0047] As can be seen from Table 1, the mass wear of the outer sheaths of the anti-interference, oil-resistant and wear-resistant control cables prepared in Examples 1-5 is lower than that of Comparative Examples 1-4, indicating that adding ethylene-acrylic copolymer composite nano-silica composed of nano-silica and ethylene-acrylic copolymer to the outer sheath raw material can improve the wear resistance of the anti-interference, oil-resistant and wear-resistant control cables.

[0048] Experimental Example 2 The outer sheaths of the anti-interference, oil-resistant and wear-resistant control cables prepared in Examples 5-8 were axially cut, and a narrow strip was taken to prepare a dumbbell-shaped specimen. The tensile strength of the outer sheaths was tested according to the method in GB / T 1040.3-2006 "Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets". The thickness was 1 mm and the test speed was 50 mm / min. The test results are shown in Table 2.

[0049] Table 2 Test results of tensile strength of the outer sheaths of control cables

[0050] As can be seen from Table 2, the tensile strength of the outer sheaths of the anti-interference, oil-resistant and wear-resistant control cables prepared in Examples 7-8 is higher than that of Examples 5-6, indicating that when the acrylic acid content in the ethylene-acrylic copolymer in the wear-resistant agent is 10 wt% - 15 wt%, the tensile strength of the anti-interference, oil-resistant and wear-resistant control cables is the best.

[0051] Experimental Example 3 The outer sheath of the anti-interference, oil-resistant and wear-resistant control cables prepared in Examples 1 to 3 was axially cut open, and a narrow strip was taken to prepare dumbbell-shaped specimens. The elongation at break of the outer sheath was tested according to the method in GB / T 1040.3-2006 "Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets", with a thickness of 1 mm and a test speed of 50 mm / min; according to the method in GB / T 2951.21-2008 "General test methods for insulating and sheathing materials of cables and optical cables - Part 21: Methods specific to elastomeric compounds - Ozone resistance, heat elongation, immersion in mineral oil test", the sheath specimens were immersed in IRM902 oil at an immersion temperature of 100 °C for 70 h. After the immersion, the elongation at break of the sheath specimens was tested, and the test results are shown in Table 3.

[0052] Table 3 Test results of elongation at break of the outer sheath of the control cable

[0053] As can be seen from Table 3, the oil resistance of the outer sheath of the anti-interference, oil-resistant and wear-resistant control cables prepared in Examples 1 to 3 meets the usage requirements of the product, has good usage performance, and can adapt to complex industrial environments.

[0054] 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 in the protection scope of the present invention.

Claims

1. An anti-interference, oil-resistant and wear-resistant control cable, characterized in that: The invention comprises a cable core, a filling layer, a shielding layer and an outer sheath from the inside to the outside. The cable core comprises a wire core and an insulating layer coated on the outside of the wire core. The outer sheath comprises the following raw materials in parts by weight: 70-80 parts of polyolefin elastomer, 10-20 parts of ultra-high molecular weight polyethylene, 1-3 parts of antioxidant, 2-5 parts of wetting agent, 20-40 parts of flame retardant, 0.5-1 parts of compatibilizer, and 15-30 parts of ethylene-acrylic acid copolymer composite nano-silica. The Shore hardness D of the ultra-high molecular weight polyethylene is 60-65.

2. The anti-interference, oil-resistant and wear-resistant control cable according to claim 1 is characterized in that: The raw materials of the ethylene-acrylic acid copolymer composite nano-silica include nano-silica, aminosilane coupling agent and ethylene-acrylic acid copolymer.

3. The anti-interference, oil-resistant and wear-resistant control cable according to claim 2 is characterized in that: The content of acrylic acid in the ethylene-acrylic acid copolymer is 10 wt % to 15 wt %.

4. The anti-interference, oil-resistant and wear-resistant control cable according to claim 3 is characterized in that: The mass ratio of the nano-silica, the aminosilane coupling agent and the ethylene-acrylic acid copolymer is 20:2:1-2.

5. The anti-interference, oil-resistant and wear-resistant control cable according to claim 1 is characterized in that: The preparation method of the ethylene-acrylic acid copolymer composite nano-silica comprises the following steps: A1, adding nano-silica and aminosilane coupling agent into a first solvent for first mixing, and drying to obtain pretreated nano-silica; A2. Add the pretreated nano-silica and ethylene-acrylic acid copolymer into the second solvent for a second mixing, and obtain the anti-wear agent after drying.

6. The anti-interference, oil-resistant and wear-resistant control cable according to claim 1 is characterized in that: The antioxidant includes one or more of antioxidant 2246 , antioxidant 1010 , antioxidant 1024 , antioxidant 168 , and antioxidant 1076 .

7. The anti-interference, oil-resistant and wear-resistant control cable according to claim 6, characterized in that: When the antioxidant is antioxidant 1076 or antioxidant 168, the mass ratio of the antioxidant 1076 to the antioxidant 168 is 2:

1.

8. The anti-interference, oil-resistant and wear-resistant control cable according to claim 7, characterized in that: The polyolefin elastomer includes ethylene-1-octene copolymer and ethylene-butene copolymer.

9. The anti-interference, oil-resistant and wear-resistant control cable according to claim 8, characterized in that: The mass ratio of the ethylene-1-octene copolymer to the ethylene-butene copolymer is 1:4-7.

10. The anti-interference, oil-resistant and wear-resistant control cable according to claim 1, characterized in that: The wetting agent includes one or more of zinc stearate, polyethylene wax, and calcium stearate; The flame retardant includes one or more of aluminum hydroxide, melamine, and triphenyl phosphate; The compatibilizer includes one or two of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene.

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