High-strength corrosion-resistant flexible cable and preparation method thereof

Abstract

The application relates to the technical field of cables, and discloses a high-strength corrosion-resistant flexible cable and a preparation method thereof. The high-strength corrosion-resistant flexible cable comprises, from inside to outside, a conductor, an insulation layer, a shielding layer and a sheath layer. The conductor is made of 15-20 strands of conductive metal wires through a binding and twisting process, and the conductive metal wires of the conductor are arranged in a concentric circular layer shape. Through the technical scheme, the problem that the conductor of a traditional flexible cable is prone to breakage when repeatedly bent is solved.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a high-strength corrosion-resistant flexible cable and its preparation method. Background Technology

[0002] Flexible cables, as core components for power transmission and signal control, are widely used in industrial automation, rail transportation, and new energy equipment. In these applications, cables often need to withstand frequent bending, dragging, and torsion, placing higher demands on their structural strength. However, traditional flexible cables mostly use a solid conductor structure. During use, mechanical stress easily concentrates on a single metal body, easily leading to localized plastic deformation or even fracture, resulting in decreased conductivity or failure, making it difficult to meet the requirements of long-term, high-intensity operating conditions. Therefore, it is necessary to propose a high-strength, corrosion-resistant flexible cable and its manufacturing method. Summary of the Invention

[0003] This invention proposes a high-strength corrosion-resistant flexible cable and its preparation method, which solves the problem that the conductor of traditional flexible cables is prone to breakage when repeatedly bent in related technologies.

[0004] The technical solution of the present invention is as follows: This invention proposes a high-strength corrosion-resistant flexible cable, which includes, from the inside out, a conductor, an insulation layer, a shielding layer, and a sheath layer; the conductor is made of 15 to 20 strands of conductive metal wires through a bundling and stranding process, and the conductive metal wires of the conductor are arranged in concentric circular layers.

[0005] As a further technical solution, the material of the insulating layer is polyethylene.

[0006] As a further technical solution, the shielding layer is woven from galvanized copper wire.

[0007] As a further technical solution, the sheath layer comprises the following raw materials in parts by weight: 50-80 parts of ethylene-vinyl acetate copolymer, 25-35 parts of polyethylene, 8-15 parts of ethylene-methyl acrylate copolymer, 20-30 parts of flame retardant, 10-20 parts of filler, 1-3 parts of lubricant, 5-10 parts of compatibilizer, 1-3 parts of crosslinking agent, and 1-3 parts of antioxidant; The filler comprises the following raw materials in parts by weight: 100 parts sericite, 0.5-1.5 parts polyethylene glycol methacrylate, and 7.5-8.5 parts methyl methacrylate.

[0008] This invention relates to a high-strength, corrosion-resistant flexible cable that modifies sericite using a composite of methyl methacrylate and polyethylene glycol methacrylate. The modified filler is then added to the sheath layer to improve its corrosion resistance. Sericite is commonly used as a filler in cable sheaths to enhance their corrosion resistance; however, its high surface energy makes it prone to aggregation, hindering its ability to effectively improve corrosion resistance. This invention modifies sericite by using a composite of methyl methacrylate and polyethylene glycol methacrylate to form a coating layer on the sericite surface, improving its dispersibility and thus enhancing the corrosion resistance of the sheath layer.

[0009] As a further technical solution, the mass ratio of methyl methacrylate to polyethylene glycol methacrylate is 8:1.

[0010] As a further technical solution, the method for preparing the filler includes the following steps: A1. Disperse sericite in a solvent, add silane coupling agent KH-570, mix, filter, and dry to obtain pretreated sericite. A2. Disperse polyethylene glycol methacrylate, methyl methacrylate, and sodium dodecyl sulfate in water, then add pretreated sericite and mix to obtain an emulsion; A3. Add an initiator aqueous solution to the suspension, mix, filter, wash, and dry to obtain the filler.

[0011] As a further technical solution, in step A1, the mass-to-volume ratio of sericite to solvent is 1g:10mL, and the solvent is an aqueous ethanol solution with a mass fraction of 75%.

[0012] As a further technical solution, in step A1, the mass of the silane coupling agent KH-570 is 3% to 5% of the mass of sericite.

[0013] As a further technical solution, in step A1, the mixing temperature is 45~55℃ and the time is 2~4h.

[0014] As a further technical solution, in step A2, the mass of sodium dodecyl sulfate is 1.5% to 3% of the mass of sericite.

[0015] As a further technical solution, in step A2, the mass of the water is 80% to 100% of the mass of the sericite.

[0016] As a further technical solution, in step A3, the initiator aqueous solution is an ammonium persulfate aqueous solution, the mass fraction of the ammonium persulfate aqueous solution is 3%, and the mass of the ammonium persulfate in the ammonium persulfate aqueous solution is 8% of the mass of the calcium carbonate.

[0017] As a further technical solution, in step A3, the mixing temperature is 75~85℃ and the time is 8~10h.

[0018] As a further technical solution, in step A3, the washing process uses a 70% ethanol aqueous solution.

[0019] As a further technical solution, the ethylene-methyl acrylate copolymer includes a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer; the methyl acrylate content of the first ethylene-methyl acrylate copolymer and the second ethylene-methyl acrylate copolymer is different.

[0020] As a further technical solution, the first ethylene-methyl acrylate copolymer has a methyl acrylate mass content of 13%, and the second ethylene-methyl acrylate copolymer has a methyl acrylate mass content of 21.5%.

[0021] This invention incorporates two ethylene-methyl acrylate copolymers with different methyl acrylate mass contents into the cable sheath layer, thereby enhancing the mechanical strength of the sheath layer. The first ethylene-methyl acrylate copolymer has a higher proportion of ethylene segments, resulting in better compatibility with the polyethylene in the sheath layer base material, which strengthens the interfacial bonding and improves the mechanical strength of the sheath layer. The second ethylene-methyl acrylate copolymer contains more polar ester groups, which can form hydrogen bonds with the vinyl acetate groups of the ethylene-vinyl acetate copolymer in the sheath layer base material, increasing the degree of entanglement between molecular chains and further enhancing the mechanical strength of the sheath layer. The synergistic effect of these two copolymers enhances the mechanical strength of the sheath layer.

[0022] As a further technical solution, the mass ratio of the first ethylene-methyl acrylate copolymer to the second ethylene-methyl acrylate copolymer is 1~3:1, preferably 2:1.

[0023] As a further technical solution, the flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

[0024] As a further technical solution, the lubricant includes one or both of zinc stearate and butyl stearate.

[0025] As a further technical solution, the compatibilizer is maleic anhydride-grafted polyethylene.

[0026] As a further technical solution, the crosslinking agent includes one or both of dicumyl peroxide and tert-butyl peroxide.

[0027] As a further technical solution, the antioxidant includes one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168.

[0028] This invention also proposes a method for preparing a high-strength, corrosion-resistant flexible cable, comprising the following steps: S1. A conductor is made by arranging 15-20 strands of conductive metal wire in a concentric circular layer and then binding and stranding them together. S2. Extruding the insulating material around the conductor and cross-linking it to form an insulating layer; S3. Weave the shielding layer material into the outside of the insulation layer to form a shielding layer; S4. Mix the components of the sheath layer, extrude them onto the outside of the shielding layer, crosslink them to form the sheath layer, and obtain a high-strength, corrosion-resistant, flexible cable.

[0029] The working principle and beneficial effects of this invention are as follows: This invention relates to a high-strength, corrosion-resistant flexible cable. The conductor is constructed by concentrically bundling and twisting 15-20 strands of conductive metal wire. This structure ensures that stress is evenly distributed across each strand during bending, reducing the risk of conductor breakage due to repeated bending. Simultaneously, this structure significantly improves the conductor's tensile strength, enabling it to withstand mechanical stresses during laying and dragging. Furthermore, the cable employs a multi-layered structure from the inside out, including a conductor, insulation layer, shielding layer, and sheath layer. This progressive protection across each layer enhances the cable's corrosion resistance. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] In the following examples and comparative examples, the following materials were used: ethylene-vinyl acetate copolymer, model UE634-04; polyethylene, model 1C7A; first ethylene-methyl acrylate copolymer, grade 1913 AC, with a methyl acrylate mass content of 13%; second ethylene-methyl acrylate copolymer, grade TC 120 ExCo, with a methyl acrylate mass content of 21.5%; magnesium hydroxide, with a particle size of 3 μm; aluminum hydroxide, with a particle size of 3 μm; maleic anhydride-grafted polyethylene, with a grafting rate of 8%; sericite, with a particle size of 0.3 μm; and polyethylene glycol methacrylate, with a weight-average molecular weight of 300.

[0032] Example 1 A high-strength, corrosion-resistant flexible cable comprises, from the inside out, a conductor, an insulation layer, a shielding layer, and a sheath layer; wherein, the sheath layer comprises the following raw materials in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 25 parts of polyethylene, 8 parts of ethylene-methyl acrylate copolymer, 20 parts of magnesium hydroxide, 10 parts of filler, 1 part of zinc stearate, 5 parts of maleic anhydride-grafted polyethylene, 1 part of dicumyl peroxide, and 1 part of antioxidant 1010; wherein, the ethylene-methyl acrylate copolymer is a first type of ethylene-methyl acrylate copolymer; The method for preparing the filler includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 3 parts of silane coupling agent KH-570, mix at 45℃ for 4 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 1.5 parts of polyethylene glycol methacrylate, 7.5 parts of methyl methacrylate, and 1.5 parts of sodium dodecyl sulfate in 100 parts of water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 75°C for 10 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the weight of ammonium persulfate in the ammonium persulfate aqueous solution is 8 parts. A method for preparing a high-strength, corrosion-resistant flexible cable includes the following steps: S1. After arranging 19 strands of conductive metal wire in a concentric circular layer, a conductor is formed by bundling and stranding. S2. Extruding the insulating material around the conductor and cross-linking it to form an insulating layer; S3. Weave the shielding layer material into the outside of the insulation layer to form a shielding layer; S4. Mix the components of the sheath layer, extrude them onto the outside of the shielding layer, crosslink them to form the sheath layer, and obtain a high-strength, corrosion-resistant, flexible cable.

[0033] Example 2 A high-strength, corrosion-resistant flexible cable comprises, from the inside out, a conductor, an insulation layer, a shielding layer, and a sheath layer; wherein, the sheath layer comprises the following raw materials in parts by weight: 65 parts of ethylene-vinyl acetate copolymer, 30 parts of polyethylene, 12 parts of ethylene-methyl acrylate copolymer, 25 parts of aluminum hydroxide, 15 parts of filler, 2 parts of butyl stearate, 7 parts of maleic anhydride-grafted polyethylene, 2 parts of tert-butyl peroxide, and 2 parts of antioxidant 1076; wherein, the ethylene-methyl acrylate copolymer is a first type of ethylene-methyl acrylate copolymer; The method for preparing the filler includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 4 parts of silane coupling agent KH-570, mix at 50℃ for 3 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 1.5 parts of polyethylene glycol methacrylate, 7.5 parts of methyl methacrylate, and 2.5 parts of sodium dodecyl sulfate in 100 parts of water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 80°C for 9 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the weight of ammonium persulfate in the ammonium persulfate aqueous solution is 8 parts. A method for preparing a high-strength, corrosion-resistant flexible cable is the same as in Example 1.

[0034] Example 3 A high-strength, corrosion-resistant flexible cable comprises, from the inside out, a conductor, an insulation layer, a shielding layer, and a sheath layer; wherein, the sheath layer comprises the following raw materials in parts by weight: 80 parts of ethylene-vinyl acetate copolymer, 35 parts of polyethylene, 15 parts of ethylene-methyl acrylate copolymer, 30 parts of magnesium hydroxide, 20 parts of filler, 3 parts of zinc stearate, 10 parts of maleic anhydride-grafted polyethylene, 3 parts of dicumyl peroxide, and 3 parts of antioxidant 168; wherein, the ethylene-methyl acrylate copolymer is a first type of ethylene-methyl acrylate copolymer; The method for preparing the filler includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 5 parts of silane coupling agent KH-570, mix at 50℃ for 2 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 1.5 parts of polyethylene glycol methacrylate, 7.5 parts of methyl methacrylate, and 3 parts of sodium dodecyl sulfate in 100 parts of water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 85°C for 8 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the ammonium persulfate aqueous solution contains 8 parts by weight of ammonium persulfate. A method for preparing a high-strength, corrosion-resistant flexible cable is the same as in Example 1.

[0035] Example 4 Compared with Example 1, the only difference in this example is that the preparation method of the filler in this example includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 3 parts of silane coupling agent KH-570, mix at 55℃ for 4 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 1 part polyethylene glycol methacrylate, 8 parts methyl methacrylate, and 1.5 parts sodium dodecyl sulfate in 100 parts water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 75°C for 10 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the ammonium persulfate aqueous solution contains 8 parts by weight of ammonium persulfate.

[0036] Example 5 Compared with Example 1, the only difference in this example is that the preparation method of the filler in this example includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 3 parts of silane coupling agent KH-570, mix at 55℃ for 4 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 0.5 parts of polyethylene glycol methacrylate, 8.5 parts of methyl methacrylate, and 1.5 parts of sodium dodecyl sulfate in 100 parts of water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 75°C for 10 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the ammonium persulfate aqueous solution contains 8 parts by weight of ammonium persulfate.

[0037] Example 6 Compared with Example 1, the only difference in this example is that the ethylene-methyl acrylate copolymer in this example is composed of a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer with a mass ratio of 1:1.

[0038] Example 7 Compared with Example 1, the only difference in this example is that the ethylene-methyl acrylate copolymer in this example is composed of a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer with a mass ratio of 2:1.

[0039] Example 8 Compared with Example 1, the only difference in this example is that the ethylene-methyl acrylate copolymer in this example is composed of a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer with a mass ratio of 3:1.

[0040] Example 9 Compared with Example 1, the only difference in this example is that the ethylene-methyl acrylate copolymer in this example is a second ethylene-methyl acrylate copolymer.

[0041] Example 10 Compared with Example 1, the only difference in this example is that the preparation method of the filler in this example includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 3 parts of silane coupling agent KH-570, mix at 55℃ for 4 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 9 parts of polyethylene glycol methacrylate and 1.5 parts of sodium dodecyl sulfate in 100 parts of water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 75°C for 10 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the ammonium persulfate aqueous solution contains 8 parts by weight of ammonium persulfate.

[0042] Example 11 Compared with Example 1, the only difference in this example is that the preparation method of the filler in this example includes the following steps: A1. Disperse 100 parts of sericite in a 75% ethanol aqueous solution, add 3 parts of silane coupling agent KH-570, mix at 55℃ for 4 hours, filter and dry to obtain pretreated sericite; the mass-volume ratio of sericite to ethanol aqueous solution is 1g:10mL. A2. Disperse 9 parts methyl methacrylate and 1.5 parts sodium dodecyl sulfate in 100 parts water, then add pretreated sericite and mix to obtain a suspension; A3. Add a 3% (w / w) ammonium persulfate aqueous solution to the suspension, mix at 75°C for 10 hours, filter, wash with a 70% (w / w) ethanol aqueous solution, and dry to obtain the filler; the ammonium persulfate aqueous solution contains 8 parts by weight of ammonium persulfate.

[0043] Example 12 A high-strength, corrosion-resistant flexible cable comprises, from the inside out, a conductor, an insulation layer, a shielding layer, and a sheath layer; wherein, the sheath layer comprises the following raw materials in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 25 parts of polyethylene, 8 parts of ethylene-methyl acrylate copolymer, 20 parts of magnesium hydroxide, 10 parts of sericite, 1 part of zinc stearate, 5 parts of maleic anhydride-grafted polyethylene, 1 part of dicumyl peroxide, and 1 part of antioxidant 1010; wherein, the ethylene-methyl acrylate copolymer is a first type of ethylene-methyl acrylate copolymer; A method for preparing a high-strength, corrosion-resistant flexible cable is the same as in Example 1.

[0044] Experimental Example 1 1. Corrosion Resistance Test: Referring to the methods in GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11: General Test Methods - Thickness and Dimensional Measurement - Mechanical Properties Test", the sheath layers prepared in Examples 1-5 and Examples 10-12 were made into dumbbell specimens with a thickness of 2 mm. These specimens were immersed in a 20 wt% hydrochloric acid aqueous solution for 30 days, and the tensile strength before and after immersion was tested. The total distance between the clamps was 34 mm, and the clamp moving speed was 25 mm / min. The test results are shown in Table 1. Table 1 Corrosion resistance test results

[0045] The data in Table 1 show that the addition of fillers composed of sericite, methyl methacrylate and polyethylene glycol methacrylate can improve the corrosion resistance of the cable sheath.

[0046] Experiment Example 2 1. Mechanical Strength Test: Referring to the methods in GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11: General Test Methods - Thickness and Dimensional Measurement - Mechanical Properties Test", dumbbell specimens with a thickness of 2 mm made from the sheath layers prepared in Examples 1, 6-9 were tested for tensile strength. The total distance between the clamps was 34 mm, and the clamp moving speed was 25 mm / min. The test results are shown in Table 2. Table 2 Mechanical strength test results

[0047] The data in Table 2 show that adding a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer with different mass contents of methyl acrylate to the cable sheath layer can improve the tensile strength of the cable sheath layer.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength, corrosion-resistant flexible cable, characterized in that, From the inside out, it includes a conductor, an insulation layer, a shielding layer, and a sheath layer; the conductor is made of 15 to 20 strands of conductive metal wires through a bundling and stranding process, and the conductive metal wires of the conductor are arranged in concentric circles.

2. The high-strength corrosion-resistant flexible cable according to claim 1, characterized in that, The insulating layer is made of polyethylene.

3. The high-strength corrosion-resistant flexible cable according to claim 1, characterized in that, The shielding layer is woven from galvanized copper wire.

4. The high-strength corrosion-resistant flexible cable according to claim 1, characterized in that, The sheath layer comprises the following raw materials in parts by weight: 50-80 parts of ethylene-vinyl acetate copolymer, 25-35 parts of polyethylene, 8-15 parts of ethylene-methyl acrylate copolymer, 20-30 parts of flame retardant, 10-20 parts of filler, 1-3 parts of lubricant, 5-10 parts of compatibilizer, 1-3 parts of crosslinking agent, and 1-3 parts of antioxidant. The filler comprises the following raw materials in parts by weight: 100 parts sericite, 0.5-1.5 parts polyethylene glycol methacrylate, and 7.5-8.5 parts methyl methacrylate.

5. A high-strength, corrosion-resistant flexible cable according to claim 4, characterized in that, The mass ratio of methyl methacrylate to polyethylene glycol methacrylate is 8:

1.

6. A high-strength corrosion-resistant flexible cable according to claim 4, characterized in that, The method for preparing the filler includes the following steps: A1. Disperse sericite in a solvent, add silane coupling agent KH-570, mix, filter, and dry to obtain pretreated sericite. A2. Disperse polyethylene glycol methacrylate, methyl methacrylate, and sodium dodecyl sulfate in water, then add pretreated sericite and mix to obtain an emulsion; A3. Add an initiator aqueous solution to the suspension, mix, filter, wash, and dry to obtain the filler.

7. A high-strength, corrosion-resistant flexible cable according to claim 4, characterized in that, The ethylene-methyl acrylate copolymer includes a first ethylene-methyl acrylate copolymer and a second ethylene-methyl acrylate copolymer; the first ethylene-methyl acrylate copolymer and the second ethylene-methyl acrylate copolymer have different methyl acrylate mass contents.

8. A high-strength, corrosion-resistant flexible cable according to claim 7, characterized in that, The first ethylene-methyl acrylate copolymer has a methyl acrylate content of 13% by mass, and the second ethylene-methyl acrylate copolymer has a methyl acrylate content of 21.5% by mass.

9. A high-strength corrosion-resistant flexible cable according to claim 8, characterized in that, The mass ratio of the first ethylene-methyl acrylate copolymer to the second ethylene-methyl acrylate copolymer is 1~3:

1.

10. A method for preparing a high-strength corrosion-resistant flexible cable, used to prepare a high-strength corrosion-resistant flexible cable as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. A conductor is made by arranging 15-20 strands of conductive metal wire in a concentric circular layer and then binding and stranding them together. S2. Extruding the insulating material around the conductor and cross-linking it to form an insulating layer; S3. Weave the shielding layer material into the outside of the insulation layer to form a shielding layer; S4. Mix the components of the sheath layer, extrude them onto the outside of the shielding layer, and cross-link them to form the sheath layer, thus obtaining a high-strength, corrosion-resistant, flexible cable.

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