An anti-interference, oil-resistant and wear-resistant control cable

Abstract

The present invention relates to the field of cable technology and proposes an anti-interference, oil-resistant, and wear-resistant control cable. The cable comprises, from the inside out, a cable core, a filling layer, a shielding layer, and an outer sheath. The cable core comprises a wire core and an insulating layer covering the wire core. The outer sheath comprises the following components by weight: 70-80 parts polyolefin elastomer, 10-20 parts ultra-high molecular weight polyethylene, 1-3 parts antioxidant, 2-5 parts wetting agent, 20-40 parts flame retardant, 0.5-1 part compatibilizer, and 15-30 parts ethylene-acrylic acid copolymer composite nano-silica. The ultra-high molecular weight polyethylene has a Shore D hardness of 60-65. This technical solution solves the problem of poor wear resistance of control cables in related technologies.

Description

Technical Field

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

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

[0003] Traditional ordinary control cables have exposed many limitations when facing complex industrial environments. In some harsh working conditions, such as mining and construction sites, cables need to be frequently dragged, rubbed, and scratched by various sharp objects. The outer sheath material of ordinary cables has poor wear resistance, and is very prone to wear, cracking, and other phenomena under long-term external force. Once the outer sheath is damaged, the internal conductor and insulation layer will be directly exposed, which may not only cause signal transmission interruption, cause equipment failure, and affect the normal operation of the entire production process, but may also cause safety accidents due to problems such as short circuits. At present, the outer sheath of the cable is mainly made of polypropylene, polyethylene and other materials. This material has the advantages of high strength and good toughness, but has poor wear resistance. When faced with continuous friction, its molecular structure is easily destroyed, resulting in surface wear. Therefore, it is of great significance to develop a control cable with high wear resistance. 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 resistance of control cables in related technologies.

[0005] The technical solutions of the present invention are as follows:

[0006] The present invention provides an anti-interference, oil-resistant and wear-resistant control cable, which comprises, from the inside to the outside, a cable core, a filling layer, a shielding layer, and an outer sheath. 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 to 80 parts of a polyolefin elastomer, 10 to 20 parts of ultra-high molecular weight polyethylene, 1 to 3 parts of an antioxidant, 2 to 5 parts of a wetting agent, 20 to 40 parts of a flame retardant, 0.5 to 1 part of a compatibilizer, and 15 to 30 parts of an ethylene-acrylic acid copolymer composite nano-silica. The Shore D hardness of the ultra-high molecular weight polyethylene is 60 to 65.

[0007] As a further technical solution, the weight proportion of the polyolefin elastomer is preferably 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, and more preferably 75 parts;

[0008] The weight portion of the ultra-high molecular weight polyethylene is preferably 10 parts, 15 parts, 20 parts, and more preferably 15 parts;

[0009] The weight portion of the flame retardant is preferably 20 parts, 30 parts, 40 parts, more preferably 30 parts;

[0010] The weight proportion of the ethylene-acrylic acid copolymer composite nano-silica is preferably 15 parts, 23 parts, 30 parts, and more preferably 23 parts.

[0011] As a further technical solution, the raw materials of the ethylene-acrylic acid copolymer composite nano-silica include nano-silica, aminosilane coupling agent, and ethylene-acrylic acid copolymer.

[0012] In the present invention, nano-silica has an extremely high specific surface area and surface energy. When subjected to external friction, it can act as a stress concentration point to disperse the externally applied stress and avoid premature wear of the material due to excessive local stress. At the same time, the nano-silica can form a physical entanglement with the polyolefin elastomer matrix, enhancing the overall strength and toughness of the matrix material, making the material more difficult to be damaged during the friction process, thereby improving the wear resistance. The aminosilane coupling agent molecule contains an amino active group at one end and a siloxy group at the other end. The siloxy group is hydrolyzed in water to form a silanol group, which can form a hydrogen bond with the hydroxyl group on the surface of the nano-silica, and the amino group can be combined with the carboxyl group in the ethylene-acrylic acid copolymer through hydrogen bonding. The ethylene-acrylic acid copolymer has a certain flexibility, and the acrylic acid unit in its molecular structure has good adhesion properties, which helps the nano-silica to be tightly bonded to the polyolefin elastomer matrix material, further improving the wear resistance of the outer protective layer.

[0013] As a further technical solution, the content of acrylic acid in the ethylene-acrylic acid copolymer is 10 wt % to 15 wt %.

[0014] 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 bonding strength between the nano-silica and other raw materials in the outer protective layer and improving the mechanical properties of the outer protective layer. However, when the acrylic acid content is too high, the rigidity of the polymer is insufficient and the melt strength is reduced. When the content is too low, the adhesion to the substrate is reduced, and the bonding strength between the nano-silica and the substrate material is weakened. Experiments have found that when the acrylic acid content in the ethylene-acrylic acid copolymer is 10wt% to 15wt%, the material can maintain rigidity and ensure strong bonding between the nano-silica and the substrate material, thereby improving the tensile strength of the outer protective layer.

[0015] As a further technical solution, the mass ratio of the nano-silica, aminosilane coupling agent, and ethylene-acrylic acid copolymer is 20:2:1~2.

[0016] As a further technical solution, the aminosilane coupling agent includes one of silane coupling agent KH-550 and silane coupling agent KH-792.

[0017] As a further technical solution, the preparation method of the wear-resistant agent comprises the following steps:

[0018] A1, adding nano-silica and aminosilane coupling agent into a first solvent for a first mixing, and drying to obtain pretreated nano-silica;

[0019] 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.

[0020] In the present invention, nano-silica, an aminosilane coupling agent, and an ethylene-acrylic acid copolymer are mixed in steps. In the first mixing step, the aminosilane coupling agent and the nano-silica are fully contacted to form a stable bond. When the ethylene-acrylic acid copolymer is added for a second mixing, the amino group at the other end of the coupling agent can be combined with the carboxyl group in the ethylene-acrylic acid copolymer. The ethylene in the ethylene-acrylic acid copolymer has high compatibility with polyolefin elastomers and ultra-high molecular weight polyethylene based on the principle of like dissolves like, thereby improving the bonding force between the nano-silica and the substrate. If the nano-silica, the aminosilane coupling agent, and the ethylene-acrylic acid copolymer are mixed at the same time, the presence of the ethylene-acrylic acid copolymer will affect the bonding between the aminosilane coupling agent and the nano-silica, reduce the dispersibility of the nano-silica, and further reduce the wear resistance of the outer protective layer.

[0021] As a further technical solution, the first solvent is water; the second solvent is N,N-dimethylformamide.

[0022] 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.

[0023] 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 hours.

[0024] As a further technical solution, the antioxidant includes one or more of antioxidant 2246, antioxidant 1010, antioxidant 1024, antioxidant 168, and antioxidant 1076.

[0025] In the present invention, the antioxidant types 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, wherein the phenolic hydroxyl groups can provide active hydrogen atoms. When the material is oxidized, free radicals can be generated to capture the phenolic hydroxyl hydrogen atoms to form stable phenoloxy free radicals, 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-radical products. By compounding the hindered phenol antioxidants with the phosphite antioxidants, synergistic enhancement is achieved, the antioxidant capacity is further improved, and the overall antioxidant performance of the material is enhanced.

[0026] As a further technical solution, when the antioxidant is antioxidant 1076 or antioxidant 168, the mass ratio of the antioxidant 1076 to the antioxidant 168 is 2:1.

[0027] In the present invention, the antioxidant performance is improved by compounding a hindered phenol antioxidant and a phosphite antioxidant. The optional combinations are antioxidant 2246 and antioxidant 168, antioxidant 1010 and antioxidant 168, and antioxidant 1076 and antioxidant 168, preferably a combination of antioxidant 1076 and antioxidant 168; the mass ratio of antioxidant 1076 to antioxidant 168 is 1-5:1, preferably 2-3:1, and more preferably 2:1.

[0028] As a further technical solution, the polyolefin elastomer includes ethylene-1-octene copolymer and ethylene-butene copolymer.

[0029] In the present invention, the polyolefin elastomer is a thermoplastic elastomer produced 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 properties of plastic and rubber. The crystalline regions of the polyethylene chains serve as physical crosslinking points, giving it plastic properties; while the addition of α-olefins weakens the crystalline regions, forming amorphous regions, giving it rubber elasticity. Among them, the longer octene side chains in the ethylene-1-octene copolymer give it excellent flexibility and impact resistance. The ethylene-butene copolymer has excellent elasticity. The ethylene-1-octene copolymer and the ethylene-butene copolymer are compounded as the base material of the outer sheath, so that the outer sheath has good flexibility, elasticity, and impact resistance.

[0030] As a further technical solution, the mass ratio of the ethylene-1-octene copolymer to the ethylene-butene copolymer is 1:4-7; preferably 1:4, 1:5, 1:6, 1:7.

[0031] As a further technical solution, the wetting agent includes one or more of zinc stearate, polyethylene wax, and calcium stearate;

[0032] The flame retardant includes one or more of aluminum hydroxide, melamine, and triphenyl phosphate;

[0033] The compatibilizer includes one or both of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene.

[0034] In the present invention, the addition of the wetting agent can reduce the interfacial tension between the solid particles and the polyolefin elastomer substrate, so that the solid particles can be evenly dispersed in the matrix. The wetting agent can also improve the melt fluidity of the outer protective layer. During the extrusion process, the flow of the melt can be smoother, reducing internal stress concentration, reducing the probability of product defects, and ensuring stable product quality.

[0035] Flame retardants can effectively improve the fire safety performance of the outer sheath. When heated, aluminum hydroxide decomposes, releasing water of crystallization. This water vaporization further absorbs heat and dilutes the oxygen and combustible gas concentrations in the combustion zone, inhibiting combustion. Furthermore, the aluminum oxide formed by the decomposition of aluminum hydroxide forms a dense protective film on the material surface, isolating oxygen and heat transfer, preventing further combustion. When heated, melamine decomposes into ammonia and cyanuric acid. Ammonia dilutes the oxygen and combustible gas concentrations in the combustion zone, fundamentally inhibiting the continued combustion reaction. Cyanuric acid further polymerizes to form a heat-insulating structure, creating an insulating layer on the material surface that blocks heat transfer into the interior and slows combustion. When heated, triphenyl phosphate decomposes into products such as phosphoric acid and phenol. Phosphoric acid promotes dehydration and carbonization of the material surface, forming a carbonaceous layer with heat- and oxygen-isolating properties that effectively prevents heat transfer into the interior and slows combustion.

[0036] Due to the different molecular structures and properties of the different polymers in the sheath layer, compatibility is poor, which easily leads to phase separation. The addition of a compatibilizer can effectively address this problem. The maleic anhydride groups in maleic anhydride-grafted polyethylene and maleic anhydride-grafted polypropylene have strong polarity, which can interact with other materials in the outer sheath, establish connections, strengthen interfacial bonding, and tightly bind the phases, reducing phase separation and improving the stability of the outer sheath.

[0037] The present invention also provides a method for preparing an anti-interference, oil-resistant and wear-resistant control cable, which is used to prepare the anti-interference, oil-resistant and wear-resistant control cable, comprising the following steps:

[0038] S1. Twisting the copper conductors to obtain a core, extruding a polyethylene material on the outer side of the core to form an insulation layer to obtain a cable core;

[0039] S2, twisting the cable cores into a cable, and filling the cable cores with polyvinyl chloride material to form a filling layer;

[0040] S3. Wrap the copper tape around the outside of the filling layer to form a shielding layer to obtain a semi-finished control cable;

[0041] S4. After mixing the raw materials for the outer sheath, extrude the mixture onto the outer side of the semi-finished control cable to obtain an anti-interference, oil-resistant, and wear-resistant control cable.

[0042] The working principle and beneficial effects of the present invention are:

[0043] In the present invention, polyolefin elastomer is used as the main matrix material, which has good flexibility and elasticity, can buffer external friction and reduce wear. By adding ultra-high molecular weight polyethylene, its long molecular chain structure makes it difficult to be destroyed when subjected to friction, and 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 composited, while ensuring hardness and toughness, the wear resistance of the material is also improved, so that the outer sheath of the cable can still maintain good wear resistance in various friction environments during long-term use, effectively extending the service life of the cable. DETAILED DESCRIPTION

[0044] 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 are within the scope of protection of the present invention.

[0045] In the following examples and comparative examples:

[0046] Ultra-high molecular weight polyethylene (UHMWPE U050 H) with a Shore D hardness of 60; ultra-high molecular weight polyethylene (UHMWPE XM-221U) with a Shore D hardness of 65; ethylene-acrylic acid copolymer (EAA 5020) with an acrylic acid content of 7.5wt%; ethylene-acrylic acid copolymer (EAA 5080) with an acrylic acid content of 10wt%; ethylene-acrylic acid copolymer (EAA 5200) with an acrylic acid content of 15wt%; ethylene-acrylic acid copolymer (EAA 5990) with an acrylic acid content of 22wt%; nano-silica with a particle size of 50nm; ethylene-1-octene copolymer (POE 8105); ethylene-butene copolymer (POE 7467); maleic anhydride-grafted polyethylene (Fusabond E226); maleic anhydride-grafted polypropylene (ADMER QB510); polyethylene wax (H110).

[0047] Example 1

[0048] A method for preparing an anti-interference, oil-resistant, and wear-resistant control cable comprises the following steps:

[0049] S1. Twisting 6 copper conductors to obtain a core, extruding a polyethylene material on the outside of the core to form an insulation layer to obtain a cable core;

[0050] S2. Twisting the three cable cores into a cable, and filling the cable with polyvinyl chloride material to form a filling layer;

[0051] S3. Wrap the copper tape around the outside of the filling layer to form a shielding layer to obtain a semi-finished control cable;

[0052] 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 parts of maleic anhydride grafted polyethylene, and 15 parts of ethylene-acrylic acid copolymer composite nano-silica, and extruding the mixture on the outside of the semi-finished control cable to form an outer sheath, thereby obtaining an anti-interference, oil-resistant, and wear-resistant control cable;

[0053] The preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps: adding 40g of nano-silica and 2g of ethylene-acrylic acid copolymer EAA 5020 to 50g of N,N-dimethylformamide, mixing at 80°C for 4h, and drying to obtain the ethylene-acrylic acid copolymer composite nano-silica.

[0054] Example 2

[0055] A method for preparing an anti-interference, oil-resistant, and wear-resistant control cable comprises the following steps:

[0056] S1. Twisting 6 copper conductors to obtain a core, extruding a polyethylene material on the outside of the core to form an insulation layer to obtain a cable core;

[0057] S2. Twisting the three cable cores into a cable, and filling the cable with polyvinyl chloride material to form a filling layer;

[0058] S3. Wrap the copper tape around the outside of the filling layer to form a shielding layer to obtain a semi-finished control cable;

[0059] 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 parts of maleic anhydride grafted polypropylene, and 21 parts of ethylene-acrylic acid copolymer composite nano-silica, and extruding the mixture on the outside of the semi-finished control cable to form an outer sheath, thereby obtaining an anti-interference, oil-resistant, and wear-resistant control cable;

[0060] The preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps: adding 40g of nano-silica and 2g of ethylene-acrylic acid copolymer EAA 5020 to 50g of N,N-dimethylformamide, mixing at 85°C for 3h, and drying to obtain the ethylene-acrylic acid copolymer composite nano-silica.

[0061] Example 3

[0062] A method for preparing an anti-interference, oil-resistant, and wear-resistant control cable comprises the following steps:

[0063] S1. Twisting 6 copper conductors to obtain a core, extruding a polyethylene material on the outside of the core to form an insulation layer to obtain a cable core;

[0064] S2. Twisting the three cable cores into a cable, and filling the cable with polyvinyl chloride material to form a filling layer;

[0065] S3. Wrap the copper tape around the outside of the filling layer to form a shielding layer to obtain a semi-finished control cable;

[0066] 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 extruding the mixture on the outside of the semi-finished control cable to form an outer sheath, thereby obtaining an anti-interference, oil-resistant, and wear-resistant control cable;

[0067] The preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps: adding 40g of nano-silica and 4g of ethylene-acrylic acid copolymer EAA 5020 to 50g of N,N-dimethylformamide, mixing at 90°C for 2h, and drying to obtain the ethylene-acrylic acid copolymer composite nano-silica.

[0068] Example 4

[0069] The only difference between this embodiment and embodiment 2 is that the preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps:

[0070] A1, 40g of nano-silica and 4g of silane coupling agent KH-550 were added to water and mixed at 30°C for 30min, and then dried to obtain pretreated nano-silica;

[0071] A2. Pretreated nano-silica and 2 g of ethylene-acrylic acid copolymer EAA 5020 were added to 50 g of N,N-dimethylformamide and mixed at 85° C. for 3 h. After drying, ethylene-acrylic acid copolymer composite nano-silica was obtained.

[0072] Example 5

[0073] The only difference between this embodiment and embodiment 2 is that the preparation method of ethylene-acrylic acid copolymer composite nano-silica comprises the following steps:

[0074] A1. Add 40 g of nano-silica and 4 g of silane coupling agent KH-792 into water, mix at 40° C. for 60 min, and then dry to obtain pretreated nano-silica;

[0075] A2. Pretreated nano-silica and 4 g of ethylene-acrylic acid copolymer EAA 5020 were added to 50 g of N,N-dimethylformamide and mixed at 85° C. for 3 h. After drying, ethylene-acrylic acid copolymer composite nano-silica was obtained.

[0076] Example 6

[0077] The only difference between this embodiment and embodiment 5 is that the ethylene-acrylic acid copolymer EAA 5020 is replaced by an equal amount of ethylene-acrylic acid copolymer EAA 5990.

[0078] Example 7

[0079] The only difference between this embodiment and embodiment 5 is that the ethylene-acrylic acid copolymer EAA 5020 is replaced by an equal amount of ethylene-acrylic acid copolymer EAA 5080.

[0080] Example 8

[0081] The only difference between this embodiment and embodiment 5 is that the ethylene-acrylic acid copolymer EAA 5020 is replaced by an equal amount of ethylene-acrylic acid copolymer EAA 5200.

[0082] Comparative Example 1

[0083] The only difference between this comparative example and Example 2 is 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 onto the outside of the semi-finished control cable to form an outer sheath, thereby obtaining an anti-interference, oil-resistant, and wear-resistant control cable.

[0084] Comparative Example 2

[0085] The only difference between this comparative example and Example 2 is that the ethylene-acrylic acid copolymer composite nano-silica is replaced by an equal amount of nano-silica.

[0086] Comparative Example 3

[0087] The only difference between this comparative example and Example 2 is that ultra-high molecular weight polyethylene UHMWPE XM-221U is not added.

[0088] Comparative Example 4

[0089] The comparative example is different from Example 2 only 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 extruded onto the outside of the semi-finished control cable to form an outer sheath, thereby obtaining an interference-resistant, oil-resistant, and wear-resistant control cable.

[0090] Experimental Example 1

[0091] The outer sheath of the anti-interference, oil-resistant, and wear-resistant control cables prepared in Examples 1 to 5 and Comparative Examples 1 to 4 was cut open axially, and a narrow strip was taken to prepare a strip specimen. The mass wear of the outer sheath was tested according to the method in GB / T 3960-2016 "Test Method for Sliding Friction and Wear of Plastics". The test conditions were: test ring speed 200 r / min, test time 2 h, load 196 N, and the test results are shown in Table 1.

[0092] Table 1 Test results of abrasion resistance of control cable outer sheath

[0093]

[0094] As can be seen from Table 1, the mass wear of the outer sheath of the anti-interference, oil-resistant and wear-resistant control cable prepared in Examples 1 to 5 is lower than that in Comparative Examples 1 to 4, indicating that adding ethylene-acrylic acid copolymer composite nano-silica composed of nano-silica and ethylene-acrylic acid copolymer to the outer sheath raw material can improve the wear resistance of the anti-interference, oil-resistant and wear-resistant control cable.

[0095] Experimental Example 2

[0096] The outer sheath of the anti-interference, oil-resistant, and wear-resistant control cables prepared in Examples 5 to 8 was cut open axially, and a narrow strip was taken to prepare a dumbbell-shaped specimen. The tensile strength of the outer sheath was tested according to the method in GB / T 1040.3-2006 "Determination of tensile properties of plastics - Part 3: Test conditions for film and sheeting" with a thickness of 1 mm and a test speed of 50 mm / min. The test results are shown in Table 2.

[0097] Table 2 Test results of tensile strength of control cable outer sheath

[0098]

[0099] It can be seen from Table 2 that the tensile strength of the outer sheath of the anti-interference, oil-resistant and wear-resistant control cable prepared in Examples 7 to 8 is higher than that in Examples 5 to 6, indicating that when the content of acrylic acid in the ethylene-acrylic acid copolymer in the wear-resistant agent is 10wt% to 15wt%, the tensile strength of the anti-interference, oil-resistant and wear-resistant control cable is the best.

[0100] Experimental Example 3

[0101] The outer sheath of the anti-interference, oil-resistant, and wear-resistant control cable prepared in Examples 1 to 3 was cut open axially, and a narrow strip was taken to prepare a dumbbell-shaped specimen. The elongation at break of the outer sheath was tested according to the method in GB / T 1040.3-2006 "Determination of tensile properties of plastics Part 3: Test conditions for film and sheeting", with a thickness of 1 mm and a test speed of 50 mm / min. The sheath specimen was immersed in IRM902 oil according to the method in GB / T2951.21-2008 "General test methods for insulation and sheathing materials of electric and optical cables Part 21: Special test methods for elastomeric mixtures, ozone resistance test, thermal elongation test, and mineral oil immersion test" at a temperature of 100°C and a immersion time of 70 h. After the immersion, the elongation at break of the sheath specimen was tested. The test results are shown in Table 3.

[0102] Table 3 Test results of elongation at break of control cable outer sheath

[0103]

[0104] As shown in Table 3, the oil resistance of the outer sheath of the anti-interference, oil-resistant and wear-resistant control cable prepared in Examples 1 to 3 meets the use requirements of the product, has good performance, and can adapt to complex industrial environments.

[0105] The above are only 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

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

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

3. The anti-interference, oil-resistant and wear-resistant control cable according to claim 1, 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 a 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.

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

5. The anti-interference, oil-resistant and wear-resistant control cable according to claim 4, 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.

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

7. The anti-interference, oil-resistant and wear-resistant control cable according to claim 6, characterized in that: The mass ratio of the ethylene-1-octene copolymer to the ethylene-butene copolymer is 1:4-7.

8. 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 both of maleic anhydride grafted polyethylene and maleic anhydride grafted polypropylene.

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