Interface-enhanced marine steel wire armored cable and preparation method thereof

Abstract

The invention discloses an interface-enhanced marine steel wire armored cable and a preparation method thereof, the cable sequentially comprises a cable core, a polyurethane watertight layer, a steel wire armored layer and a polyurethane outer sheath from inside to outside, and the steel wire armored layer is formed by assembling modified galvanized steel wires subjected to surface modification treatment; the modified galvanized steel wire is obtained by sequentially carrying out cleaning treatment on a galvanized steel wire so as to remove adhesive pollution on the surface, carrying out acid ultrasonic micro-etching, carrying out oxidation treatment, carrying out activating treatment, carrying out online silane gas phase pre-planting treatment and carrying out silanization treatment. According to the invention, the surface of the galvanized steel wire is modified to obtain the modified galvanized steel wire, and the interface bonding between the armoring layer formed by the modified galvanized steel wire and the polyurethane outer sheath is stable, so that the high-strength interface bonding between the steel wire armoring layer and the polyurethane outer sheath is realized; and the structural stability and the service reliability of the cable in a marine high-humidity corrosion environment are remarkably improved.

Description

Technical Field

[0001] This invention relates to an interface-enhanced marine steel wire armored cable and its manufacturing method, belonging to the technical field of marine steel wire armored cables. Background Technology

[0002] With the deepening development of marine resources, steel wire armored cables, as key components for connecting, remotely controlling, and transmitting data between marine equipment, not only need to withstand complex mechanical forces such as large tensile loads, repeated bending stresses, and impact loads during deep-sea service, but also face severe corrosion challenges due to their long-term exposure to the high salinity and high humidity of the marine environment. Traditional steel wire armored cables typically consist of a core, a watertight layer, a steel wire armor layer, and an outer sheath, from the inside out. In the marine environment, the steel wire armor layer is prone to pitting corrosion and crevice corrosion, leading to a decrease in the armor layer's load-bearing capacity and structural integrity, which in turn affects the cable's service life and operational safety. Therefore, developing steel wire armored cables that combine good corrosion resistance, mechanical properties, and long-term service reliability has become an important technological requirement in this field.

[0003] In recent years, with the application of new plating technologies, surface coating processes, and composite materials, the corrosion resistance of cables has been improved to some extent. However, existing steel wire armored cables still exhibit many shortcomings in practical applications and urgently need further improvement. Furthermore, to enhance the corrosion resistance of steel wire armored cables in marine environments, existing technologies propose using corrosion-resistant metal materials such as 316L stainless steel and duplex stainless steel as the armor wire. While these materials can reduce the corrosion rate of steel wire in seawater environments to some extent, under long-term, repeated service conditions or under complex loads such as tension, bending, and vibration, localized corrosion, pitting, or performance degradation can still occur in high-salinity and high-humidity environments, making it difficult to maintain stable mechanical properties and protective effects. Simultaneously, corrosion-resistant stainless steel materials are expensive, significantly increasing processing and cabling costs, leading to an overall increase in cable manufacturing costs. In practical engineering applications, it is difficult to achieve an ideal balance between durability, reliability, and economy, and their service life often falls short of the expected design requirements.

[0004] Galvanized steel wire is widely used as cable armor material due to its high mechanical strength and good tensile properties. However, in the high salinity environment of the ocean, the corrosion resistance of a single galvanized layer is limited, and pitting and crevice corrosion may still occur during long-term use, affecting the structural integrity of the armor layer and the overall performance of the cable.

[0005] To further improve the corrosion resistance of galvanized steel wire, an attempt was made to extrude a polyurethane outer sheath onto the surface of the galvanized steel wire to form an additional protective layer, thereby reducing the adverse effects of wear and corrosion on cable performance. While this approach can improve the corrosion resistance of deep-sea cables to some extent, practical applications have revealed weak interfacial adhesion between the polyurethane coating and the steel wire. Under stress or environmental stress, interlayer slippage, delamination, and even cracking easily occur, leading to a decrease in protective effect. This is because: firstly, although the zinc layer on the surface of the galvanized steel wire provides corrosion protection, its surface is relatively smooth. The polyurethane coating and the steel wire mainly rely on physical adsorption for bonding. This type of bonding is unstable and easily weakened under temperature changes or mechanical stress, leading to coating delamination, cracking, or even failure. Secondly, although polyurethane, as an elastomer, has good flexibility and wear resistance, its molecular structure makes it difficult to form stable chemical bonds with the metal surface. The interfacial bonding mainly relies on physical adsorption, which tends to gradually weaken during long-term service.

[0006] Therefore, effectively enhancing the interfacial bonding strength between the polyurethane outer sheath and the steel wire has become a key issue restricting the engineering feasibility and long-term reliability of such solutions. To address the problem of insufficient interfacial bonding, existing technologies have attempted to improve the bonding performance between the steel wire and the polymer outer sheath by mechanically roughening the steel wire surface, applying organic coatings, or introducing adhesive primers. However, these methods mostly rely on physical interlocking or non-directional interfacial adhesion mechanisms. Under complex mechanical loads and long-term marine environments, the interfacial layer is prone to aging, cracking, or failure, making it difficult to achieve stable and reliable long-term protective effects. Summary of the Invention

[0007] To address the aforementioned problems in the existing technology, the purpose of this invention is to provide an interface-enhanced marine steel wire armored cable and its preparation method.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: An interface-enhanced marine steel wire armored cable comprises, from the inside out, a cable core, a polyurethane watertight layer, a steel wire armor layer, and a polyurethane outer sheath, wherein the steel wire armor layer is assembled from modified galvanized steel wires that have undergone surface modification treatment. The modified galvanized steel wire is obtained by sequentially cleaning the galvanized steel wire to remove surface adhesive contaminants (e.g., oil stains, wire drawing lubricant residue, adsorbed contaminants, etc.), acidic ultrasonic micro-etching, oxidation treatment to form a uniform and continuous metal oxide film on the surface, activation treatment to increase surface energy and functional group density, online silane vapor phase pre-planting treatment, and silanization treatment. The online silane vapor phase pre-impregnation process involves placing the activated galvanized steel wire in saturated vapor of silane coupling agent for vapor phase treatment for 30-60 seconds (which can chemically adsorb a monomolecular silane layer on the surface of the ultra-high activity galvanized steel wire, providing a perfect chemical bonding basis for subsequent silanization impregnation). The silanization treatment involves immersing the galvanized steel wire, which has undergone online silane vapor phase pre-treatment, in a composite treatment solution containing a silane coupling agent and ultrasonically treating it (ultrasonic power density of 0.1-0.5 W / cm²) for 3-5 minutes. Then, the wire is removed, cleaned (specifically, rinsed with anhydrous ethanol to remove the physical adsorption layer), and cured (to promote condensation reactions between silane molecules and between silane molecules and the oxide layer on the surface of the galvanized steel wire, forming a stable silanized interface layer; specifically, gradient curing: first, pre-curing at 88-92℃ for 10-20 minutes to remove the solvent and initiate initial condensation; then, complete curing at 128-132℃ for 35-45 minutes to promote full cross-linking of the siloxane network and the formation of Si-O-Zn bonds with the metal substrate; finally, post-curing at 148-152℃ for 5-15 minutes to further improve cross-linking density and heat resistance), and cooled to obtain the modified galvanized steel wire. The composite treatment liquid has the following composition and ratio: γ-aminopropyltriethoxysilane (γ-APS): 1.7-1.9 parts by weight; 3-Glycidyl etheroxypropyltrimethoxysilane (GPTMS): 1.1-1.3 parts by weight; Modified graphene oxide: 0.9-1.1 parts by weight; Benzotriazole (BTA): 0.25-0.35 parts by weight; Cerium nitrate: 0.05-0.15 parts by weight; Ethanol: 80-90 parts by weight; Glacial acetic acid: 0.05-3 parts by weight; Deionized water: 8-12 parts by weight; The modified graphene oxide is graphene oxide modified with γ-aminopropyltriethoxysilane.

[0009] One embodiment of the modified graphene oxide preparation includes the following steps: 0.7-0.9 g of graphene oxide was dispersed in ethanol to obtain a graphene oxide dispersion with a solid content of 2-5 mg / mL. Glacial acetic acid was added to adjust the pH to 3.8-4.2, and the mixture was sonicated for 25-35 minutes (to peel off the GO sheets and activate the carboxyl and epoxy groups at the edges and defects of GO under acidic conditions, making them more responsive to silanols) to obtain a mixed solution. Dissolve 3.8-4.2 g of γ-aminopropyltriethoxysilane (γ-APS) in 40-60 mL of a mixed solvent of ethanol / water (volume ratio 4:1), adjust the pH to 3.8-4.2 with glacial acetic acid, and stir at room temperature for 25-35 minutes to form a clear silanol solution; The silanol solution was slowly added dropwise to the mixed solution containing graphene oxide. During the addition, the system temperature was controlled at 23-27℃. After the addition was completed, the mixture was stirred at 48-52℃ for 5-7 hours. After the reaction was completed, the mixture was cooled to room temperature, and 4-6 times the volume of acetone was added. The mixture was then centrifuged, washed (3-5 times with a 1:1 volume ratio of ethanol to acetone) and dried to obtain modified graphene oxide.

[0010] One embodiment of the composite treatment solution includes the following steps: Disperse the specified amounts of benzotriazole (BTA) and cerium nitrate in a portion of the specified amount of ethanol to obtain a corrosion-inhibiting solution; Modified graphene oxide was uniformly dispersed in the remaining amount of ethanol. γ-aminopropyltriethoxysilane (γ-APS) and 3-glycidyl etheroxypropyltrimethoxysilane (GPTMS) were added and stirred until homogeneous. Then, deionized water and corrosion inhibitor were added, and glacial acetic acid was added to adjust the pH to 4.1-4.3. The resulting mixture was stirred and hydrolyzed for 3-5 hours at room temperature in the dark to obtain the composite treatment solution.

[0011] In one embodiment, the silane coupling agent used in the online silane gas phase pre-planting treatment is γ-aminopropyltriethoxysilane.

[0012] One embodiment involves cleaning galvanized steel wire to remove adhesive contaminants from its surface, including the following steps: Immerse the galvanized steel wire in a 2-5wt% alkaline cleaning agent (e.g., Henkel P3-Almeco cleaning agent) aqueous solution at 60-70℃, and ultrasonically treat it (ultrasonic power density of 0.5-1W / cm²) for 5-15 minutes. Remove it and wash it with water (specifically: three-stage countercurrent water washing, the primary and secondary water is ordinary industrial water, the final water is deionized water, and an air knife is used to blow it after each stage).

[0013] One embodiment of the acidic ultrasonic micro-etching includes the following operations: After cleaning, the galvanized steel wire is immersed in a 1-3wt% citric acid aqueous solution at room temperature, ultrasonically treated (ultrasonic power density of 0.5-1W / cm²) for 1-3 minutes, removed, washed with water (specifically: three-stage countercurrent water washing, the primary and secondary water is ordinary industrial water, the final water is deionized water, and an air knife is used to blow it after each stage), and dried (dried with hot air at 90-110℃ for 2-5 minutes). Acidic ultrasonic micro-etching can neutralize residual alkali and lightly and uniformly etch the zinc layer surface to expose a fresh, highly active metallic zinc surface (removing the extremely thin oxide layer or passivation film remaining after alkaline cleaning, exposing a fresh, highly active metallic zinc surface). It can form nanoscale roughness (increasing surface roughness at the microscopic level, increasing specific surface area, and enhancing the mechanical anchoring (mechanical interlocking effect) of subsequent oxide and silane layers). It can also introduce a large number of hydroxyl groups (the zinc surface after acid etching is rich in Zn-OH, which is a key precursor for forming strong chemical bonds (Si-O-Zn) with silane molecules (Si-OH).

[0014] In one embodiment, the oxidation treatment is a chemical oxidation treatment or a low-temperature thermal oxidation treatment; The chemical oxidation treatment involves immersing the galvanized steel wire, after acidic ultrasonic micro-etching, in an acidic aqueous solution of 6-10 g / L sodium molybdate for 2-5 minutes at room temperature. The wire is then removed, washed (specifically, a two-stage countercurrent water wash; the primary water is ordinary industrial water, and the final water is deionized water, with air knife purging after each stage), and dried (using hot air at 90-110℃ for 2-5 minutes). This chemical oxidation treatment can grow a uniform, dense chemical conversion film rich in reaction sites and possessing active corrosion protection capabilities on a clean, activated zinc surface. The film is mainly composed of amorphous zinc molybdate composite oxide; correspondingly, the film can be called a zinc molybdate composite oxide film. The aforementioned low-temperature thermal oxidation treatment involves placing the galvanized steel wire, after acidic ultrasonic micro-etching, in an oxygen-containing atmosphere (e.g., air, nitrogen atmosphere containing 1-5% oxygen, etc.) and thermally oxidizing it at 90-130℃ for 20-30 minutes (specifically: raising the temperature from room temperature to 90-100℃ at a rate of 10-15℃ / min, holding for 5 minutes to remove physically adsorbed water, and then raising the temperature to the target oxidation temperature of 110-130℃ at a rate of 5-10℃ / min and holding for 15-25 minutes). This low-temperature thermal oxidation treatment promotes the formation of an oxide layer mainly composed of ZnO, which has moderate crystallinity, is rich in hydroxyl groups on the surface, and has a uniform thickness. It provides sufficient reaction sites without reducing the protective performance of the galvanized layer itself or generating internal stress due to excessive thickness.

[0015] In one embodiment, the activation treatment is selected from any one of plasma activation, corona discharge activation, and flame activation, with plasma activation and corona discharge activation being preferred. The activation treatment can clean and modify the oxide film surface, introducing a large number of highly polar oxygen-containing functional groups such as -OH (hydroxyl), -COOH (carboxyl), and C=O (carbonyl), greatly increasing the surface energy and functional group density of the steel wire.

[0016] In a preferred embodiment, the plasma activation involves treating the oxidized steel wire with atmospheric pressure radio frequency (RF) plasma at a power of 300-800 W, using an Ar / O2 mixed gas as the treatment gas (wherein the volume ratio of Ar:O2 is 95:5-85:15, preferably 90:10), and a treatment speed of 10-15 m / min.

[0017] In a preferred embodiment, the corona discharge activation is carried out under a discharge power of 1.5-3.0 kW, a processing speed of 5-15 m / min, and the processing gas is an Ar / O2 mixture.

[0018] In one embodiment, the polyurethane resin used in both the polyurethane watertight layer and the polyurethane outer sheath has the following composition and proportions: Polytetrahydrofuran ether diol (PTMEG, Mn=2000): 100 parts by weight; Isophorone diisocyanate (IPDI): 16-20 parts by weight; Hydrogenated diphenylmethylene diisocyanate (hydrogenated MDI, H12MDI): 6-8 parts by weight; 1,4-Butanediol (BDO): 4-5 parts by weight; Bis(2-hydroxyethyl) disulfide (HEDS): 5-6 parts by weight; N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane: 1.4-1.6 parts by weight; Black TPU masterbatch: 5.5-6.5 parts by weight; Organo-montmorillonite (OMMT): 3.5-4.5 parts by weight; Zinc phosphate: 2.8-3.2 parts by weight; Anti-hydrolysis agent: 1.4-1.6 parts by weight; Light stabilizer: 0.8-1.2 parts by weight; Internal release agent: 0.4-0.6 parts by weight; Organic bismuth catalyst: 0.02-0.05 parts by mass.

[0019] In one embodiment, the organomontmorillonite is selected from any one of Cloisite® 30B from Southern Clay Company, USA; FH-OC or FH-PU from Zhejiang Fenghong New Material Co., Ltd.; or Laviosa or Nanofil® from Rockwood Group, Germany; the black TPU masterbatch is selected from any one of Clariant Renol® TPU Black 8665 X and Meilian New Material CM-TPU-BK9000HT; the anti-hydrolysis agent is a carbodiimide, such as Stabaxol P; the light stabilizer is a composite system of UVA and HALS, such as a composite system of Tinuvin 326: Tinuvin 770 in a 1:1 mass ratio; the internal release agent is a stearate, such as calcium stearate; and the organobismuth catalyst is K-KAT XC-6212.

[0020] In a preferred embodiment, the preparation of the polyurethane resin includes the following steps: 1) Mix the specified amounts of 1,4-butanediol (BDO), bis(2-hydroxyethyl) disulfide (HEDS), and organobismuth catalyst evenly and preheat to 60°C to obtain a chain extender / catalyst mixture; Add the specified amount of polytetrahydrofuran ether glycol (PTMEG) to the reactor and dehydrate it for 2-3 hours at 120℃ and a vacuum degree <-0.095MPa until the water content is <0.03%. Under nitrogen protection, add the specified amount of isophorone diisocyanate (IPDI) to the dehydrated polytetrahydrofuran ether glycol and stir the reaction at 83-87℃ for 2.5-3 hours. Cool the temperature to 68-72℃, and then simultaneously add the specified amount of hydrogenated diphenylmethylene diisocyanate (H12MDI) and chain extender / catalyst mixture through different feed ports. After the addition is complete, stir and mix evenly, then stop stirring, evacuate the reactor (<-0.09 MPa), and maintain the temperature at 70-75℃ for 15-20 minutes for vacuum degassing to obtain polyurethane melt. 2) Dry-mix the specified amounts of black TPU masterbatch, organomontmorillonite, zinc phosphate, anti-hydrolysis agent, light stabilizer, and internal release agent in a high-speed mixer to obtain a mixture; add the obtained mixture to the polyurethane melt, and feed the resulting mixture into a twin-screw extruder for melt blending (the temperature of the feeding section of the twin-screw extruder is 160℃, the temperature of the melt dispersion section is 175-190℃, the temperature of the homogenization section is 185℃, and the die head temperature is 190℃), then extrude, water cool (cooling water temperature 25-30℃), pelletize, and cure (curing at 100℃ for 16-24 hours) to obtain polyurethane resin.

[0021] A method for preparing an interface-reinforced marine steel wire armored cable includes the following steps: a) Sequentially process galvanized steel wire (galvanized steel wire uses high-strength carbon steel wire as the base material, and the surface of the steel wire is formed with a protective layer by hot-dip galvanizing, with a zinc coating amount greater than 200g / mm²). 2 The modified galvanized steel wire is obtained by cleaning to remove adhesive contaminants from the surface, acidic ultrasonic micro-etching, oxidation treatment to form a uniform and continuous metal oxide film on the surface, activation treatment to increase surface energy and functional group density, online silane vapor phase pre-implantation treatment and silanization treatment. b) A continuous and dense polyurethane watertight layer is extruded onto the outside of the cable core; the thickness of the polyurethane watertight layer is 2.0-2.2 mm; c) After the watertight layer is extruded and cooled, the modified galvanized steel wire is wound in a double-layer reverse winding method (i.e., there are two layers of modified galvanized steel wire, the first layer and the second layer of steel wire are wound in opposite directions to form a torque self-balancing structure, which improves the structural stability of the cable under stress. The outer diameter of the first layer of steel wire is 2.05-2.15mm, and the outer diameter of the second layer of steel wire is 1.55-1.65mm. In addition, the tension of each steel wire is controlled at 78-82N to ensure that the steel wires are evenly arranged and tightly wound, thereby meeting the requirements of the cable for high breaking strength and long-term load-bearing capacity). A steel wire armor layer is formed on the outside of the polyurethane watertight layer. d) After completing the double-layer steel wire armor, a polyurethane outer sheath (the thickness of the polyurethane outer sheath is 2.0-2.2mm) is extruded onto the outer surface of the steel wire armor layer through an extrusion process to obtain an interface-enhanced marine steel wire armored cable.

[0022] Compared with the prior art, the present invention has the following significant advantages: This invention modifies the surface of galvanized steel wire to obtain modified galvanized steel wire. The armor layer formed by this modified galvanized steel wire has a stable interface bond with the polyurethane outer sheath, achieving a high-strength interface bond between the steel wire armor layer and the polyurethane outer sheath. This significantly improves the structural stability and service reliability of the cable in marine high-humidity and corrosive environments, and has extremely high industrial application value. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the interface-enhanced marine steel wire armored cable provided by the present invention; The labels in the diagram are as follows: 1. Cable core; 2. Polyurethane watertight layer; 3. Steel wire armor layer; 4. Polyurethane outer sheath. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail and completely below with reference to the embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or as recommended by the manufacturer. Example 1

[0025] 1) Preparation of modified graphene oxide 0.8 g of graphene oxide was dispersed in 200 ml of ethanol to obtain a graphene oxide dispersion with a solid content of 4 mg / mL. Glacial acetic acid was added to adjust the pH value to 4, and the mixture was sonicated for 30 minutes to obtain a mixed solution. Dissolve 4g of γ-aminopropyltriethoxysilane (γ-APS) in 50mL of a mixed solvent of ethanol / water (volume ratio 4:1), add glacial acetic acid to adjust the pH to 4, and stir at room temperature for 30 minutes to form a clear silanol solution; The silanol solution was slowly added dropwise to the mixed solution containing graphene oxide. During the addition, the system temperature was controlled at 25°C. After the addition was completed, the mixture was stirred at 50°C for 6 hours. After the reaction was completed, the mixture was cooled to room temperature, and acetone with a volume of 5 times that of the reaction liquid was added to precipitate the solid. The solid was then centrifuged and washed three times with a mixed solvent of ethanol and acetone in a volume ratio of 1:1. The solid was then dried to obtain the modified graphene oxide.

[0026] (ii) Preparation of composite treatment solution Disperse 0.3 parts by mass of benzotriazole (BTA) and 0.1 parts by mass of cerium nitrate in 5 parts by mass of ethanol to obtain a corrosion-inhibiting solution; One part by mass of modified graphene oxide was uniformly dispersed in 80 parts by mass of ethanol. 1.8 parts by mass of γ-aminopropyltriethoxysilane (γ-APS) and 1.2 parts by mass of 3-glycidyl etheroxypropyltrimethoxysilane (GPTMS) were added and stirred until uniformly mixed. Then, 10 parts by mass of deionized water and the aforementioned corrosion inhibitor solution were added, and 1 part by mass of glacial acetic acid was added to adjust the pH to 4.2. The resulting mixture was stirred and hydrolyzed for 4 hours at room temperature and in the dark to obtain a composite treatment solution containing a silane coupling agent.

[0027] (III) Preparation of polyurethane resin 1) Mix 4.5 parts by weight of 1,4-butanediol (BDO), 5.5 parts by weight of bis(2-hydroxyethyl) disulfide (HEDS), and 0.03 parts by weight of organic bismuth catalyst K-KAT XC-6212 evenly and preheat to 60°C to obtain a chain extender / catalyst mixture. 100 parts by weight of polytetrahydrofuran ether glycol (PTMEG, Mn=2000) were added to a reactor and dehydrated for 3 hours at 120°C and a vacuum degree <-0.095MPa until the water content was <0.03%. Under nitrogen protection, 18 parts by weight of isophorone diisocyanate (IPDI) were added to the dehydrated polytetrahydrofuran ether glycol. The mixture was stirred at 85°C for 3 hours and then cooled to 70°C. Simultaneously, 7 parts by weight of hydrogenated diphenylmethylene diisocyanate (H12MDI) and a chain extender / catalyst mixture were added through different feed ports. After the addition was completed, the mixture was stirred until homogeneous. Stirring was stopped, and the reactor was evacuated (<-0.09 MPa) and degassed at 73°C for 20 minutes to obtain polyurethane melt. 2) Mix 6 parts by weight of black TPU masterbatch (Clariant Renol® TPU Black 8665 X), 4 parts by weight of organomontmorillonite (Cloisite® 30B), 3 parts by weight of zinc phosphate, 1.5 parts by weight of hydrolysis inhibitor (Stabaxol P), 1 part by weight of light stabilizer (a 1:1 composite system of Tinuvin 326 and Tinuvin 770), and 0.5 parts by weight of internal release agent (calcium stearate) in a high-speed mixer to obtain a mixture. Add the obtained mixture to the polyurethane melt, and feed the mixture into a twin-screw extruder for melt blending. The temperature of the twin-screw extruder is 160°C in the feeding section, 180°C in the melt dispersion section, 185°C in the homogenization section, and 190°C in the die head. Then, extrude, water cool (cooling water temperature 25°C), pelletize, and cure (curing at 100°C for 20 hours) to obtain polyurethane resin.

[0028] IV) Preparation of Steel Wire Armored Cables a) The galvanized steel wire (Tianjin Zhaohong Metal Products Co., Ltd.) was sequentially subjected to cleaning treatment to remove surface adhesive contaminants, acidic ultrasonic micro-etching, oxidation treatment to form a uniform and continuous metal oxide film on the surface, activation treatment to increase surface energy and functional group density, online silane vapor phase pre-implantation treatment, and silanization treatment to obtain modified galvanized steel wire. Specifically: a1. Cleaning treatment: Galvanized steel wire was immersed in a 3wt% alkaline cleaning agent (Henkel P3-Almeco cleaning agent) aqueous solution at 65℃ and ultrasonically treated for 10 minutes under an ultrasonic power density of 0.5W / cm². After removal, it was washed with three-stage countercurrent water. The primary and secondary water were ordinary industrial water, and the final water was deionized water. Each stage was followed by air knife purging. a2. Acidic ultrasonic micro-etching: The cleaned galvanized steel wire was immersed in a 2wt% citric acid aqueous solution at room temperature, ultrasonically treated for 2 minutes under an ultrasonic power density of 0.5W / cm², removed, and rinsed with three-stage countercurrent water. The primary and secondary water were ordinary industrial water, and the final water was deionized water. Each stage was followed by air knife purging and drying with hot air at 100℃ for 5 minutes. a3. Oxidation treatment: The galvanized steel wire after acidic ultrasonic micro-etching was immersed in an acidic aqueous solution of 8g / L sodium molybdate for 3 minutes at room temperature, then removed and rinsed with countercurrent water in two stages. The primary water was ordinary industrial water and the final water was deionized water. After each stage, air knife purging and hot air drying at 100℃ for 5 minutes were performed. a4. Activation treatment: Atmospheric pressure radio frequency (RF) plasma was used to treat the oxidized steel wire. The treatment power was 500W, the treatment gas was an Ar / O2 mixture (where the volume ratio of Ar:O2 was 90:10), and the treatment speed was 10m / min. a5. Online silane vapor phase pre-implantation: The activated galvanized steel wire was placed in saturated vapor of γ-aminopropyltriethoxysilane for 45 seconds for gas phase treatment. a6. Silanization treatment: The galvanized steel wire, after online silane vapor phase pre-treatment, was immersed in the composite treatment solution prepared above, and ultrasonically treated for 5 minutes under an ultrasonic power density of 0.2 W / cm². Then, it was removed, rinsed with anhydrous ethanol, and subjected to gradient curing (first pre-curing at 90℃ for 15 minutes; then fully curing at 130℃ for 40 minutes; and finally post-curing at 150℃ for 10 minutes), and cooled to room temperature to obtain modified galvanized steel wire. b) A continuous and dense polyurethane watertight layer 2 is formed on the outside of the cable core 1 by extrusion using a twin-screw extruder. The extrusion temperature is 190°C, the thickness of the polyurethane watertight layer is 2.1 mm, and the material of the polyurethane watertight layer 2 is the polyurethane resin prepared above. c) After the watertight layer is extruded and cooled, the modified galvanized steel wire is wound in a double-layer reverse manner to form a steel wire armor layer 3 outside the polyurethane watertight layer 2; that is, there are two layers of modified galvanized steel wire, the first layer of steel wire and the second layer of steel wire are wound in opposite directions to form a torque self-balancing structure, which improves the structural stability of the cable under stress. The outer diameter of the first layer of steel wire is 2.1mm and the number of steel wires is 28; the outer diameter of the second layer of steel wire is 1.6mm and the number of steel wires is 41. The tension of each steel wire is controlled at 80N to ensure that the steel wires are evenly arranged and tightly wound, thereby meeting the requirements of the cable for high breaking strength and long-term load-bearing capacity. d) After completing the double-layer steel wire armor, a polyurethane outer sheath 4 is extruded onto the outer surface of the steel wire armor layer 3 using a twin-screw extruder via an extrusion process. The polyurethane outer sheath has a thickness of 2.1 mm and is made of the polyurethane resin prepared above, resulting in the following... Figure 1 The image shows an interface-enhanced marine steel wire armored cable. Example 2

[0029] The difference between this embodiment and Embodiment 1 is that: In the manufacturing process of marine steel wire armored cables, step a3, which involves oxidation treatment, employs a low-temperature thermal oxidation method, specifically as follows: The galvanized steel wire after acidic ultrasonic micro-etching is placed in an oxygen-containing atmosphere (nitrogen atmosphere containing 3% oxygen), and the temperature is raised from room temperature to 95°C at a rate of 10°C / min, held for 5 minutes, and then raised to the target oxidation temperature of 120°C at a rate of 5°C / min, and held for 20 minutes. Example 3

[0030] The difference between this embodiment and Embodiment 1 is that: In the preparation process of marine steel wire armored cables, step a4, during the activation treatment, employs corona discharge activation, specifically as follows: The oxidized steel wire was activated by corona discharge at a power of 2kW at a speed of 10m / min, and the treatment gas was an Ar / O2 mixture (where the volume ratio of Ar:O2 was 90:10).

[0031] Comparative Example 1 The difference between this comparative example and Example 1 is as follows: In the manufacturing process of marine steel wire armored cables, the galvanized steel wire only undergoes cleaning, oxidation, activation, and silanization treatments. During the oxidation treatment, the steel wire is directly oxidized at a low temperature of 120°C for 20 minutes. The silanization treatment uses a 3.0wt% aqueous solution of γ-aminopropyltriethoxysilane.

[0032] Comparative Example 2 The difference between this comparative example and Example 1 is as follows:

[0033] In the manufacturing process of marine steel wire armored cables, the galvanized steel wires only undergo cleaning, acidic ultrasonic micro-etching, and silanization treatment. Furthermore, the treatment solution used in the silanization treatment is a 3.0wt% aqueous solution of γ-aminopropyltriethoxysilane.

[0034] Comparative Example 3 The difference between this comparative example and Example 1 is as follows: 1) In the manufacturing process of marine steel wire armored cables, the galvanized steel wire only undergoes cleaning, oxidation, activation and silanization treatments. During the oxidation treatment, the steel wire is directly oxidized at a low temperature of 120°C for 20 minutes. The treatment solution used in the silanization treatment is a 3.0wt% aqueous solution of γ-aminopropyltriethoxysilane. 2) The preparation method of polyurethane resin used in the manufacturing process of marine steel wire armored cables for the polyurethane watertight layer and polyurethane outer sheath is as follows: 10 parts by mass of 1,4-butanediol (BDO) and 0.03 parts by mass of organic bismuth catalyst K-KAT XC-6212 were mixed evenly and preheated to 60°C to obtain a chain extender / catalyst mixture. 100 parts by weight of polytetrahydrofuran ether diol (PTMEG, Mn=2000) were added to a reactor and dehydrated for 3 hours at 120°C and a vacuum degree < -0.095 MPa until the water content was <0.03%. Under nitrogen protection, 18 parts by weight of isophorone diisocyanate (IPDI) were added to the dehydrated PTMEG and the mixture was stirred and reacted at 85°C for 3 hours, and then cooled to 70°C. After cooling to 70°C, 7 parts by mass of hydrogenated diphenylmethylene diisocyanate (H12MDI) and the above chain extender / catalyst mixture are added simultaneously through different feeding ports. After the feeding is completed, the mixture is stirred and mixed evenly. Then, stirring is stopped, the reactor is evacuated (< -0.09 MPa), and vacuum degassing is performed at 73°C for 20 minutes to obtain polyurethane melt. Six parts by weight of black TPU masterbatch (Clariant Renol® TPU Black 8665X), three parts by weight of zinc phosphate, 1.5 parts by weight of hydrolysis inhibitor (Stabaxol P), 1 part by weight of light stabilizer (a 1:1 mixture of Tinuvin 326 and Tinuvin 770), and 0.5 parts by weight of internal release agent (calcium stearate) were dry-mixed evenly in a high-speed mixer to obtain a mixture. The above mixture is added to the polyurethane melt, and the resulting mixture is fed into a twin-screw extruder for melt blending. The temperature of the feeding section is 160°C, the temperature of the melt dispersion section is 180°C, the temperature of the homogenization section is 185°C, and the temperature of the die head is 190°C. After extrusion, the mixture is cooled with 25°C cooling water, pelletized, and cured at 100°C for 20 hours to obtain polyurethane resin.

[0035] Performance testing: Artificial seawater solution was prepared according to ASTM D1141 standard. Under artificial seawater immersion conditions (immersion temperature 23±2℃, immersion time 90 days), the interface durability between the steel wire armor layer and the polyurethane outer sheath of the marine steel wire armored cables prepared in Examples 1-3 and Comparative Examples 1-3 was tested. Specifically: 1) Appearance condition test: The cables of the examples and comparative examples were immersed in artificial seawater solution. Macroscopic photography and stereomicroscopic observation were performed on the test cables to observe whether there was water line intrusion, rust seepage, or widening of gaps between the outer sheath and the armor layer, and whether there were bubbles, wrinkles, circumferential cracks, or rust spots penetrating the surface of the outer sheath. 2) Pull-off method for testing interfacial bonding strength: Referring to GB / T6329–1996 Tensile Strength Test of Adhesive Joints and Adhesion Test Method of Cable Sheath: Take a 100mm long cable segment, cut both ends flat, remove 10mm of the outer sheath at one end of the cable to expose the armor steel wire for clamping, and keep the outer sheath intact at the other end of the cable. Cover the outer surface of the outer sheath with a ring clamp, and then apply radial clamping force (to prevent the sheath from breaking). Then, use a universal testing machine with the upper clamp holding the exposed steel wire end and the lower clamp holding the outer sheath end for axial tension at a speed of 5mm / min. Record the maximum load Fmax (N) when the outer sheath completely slips off the armor layer or the sheath breaks. Calculate the pull-out strength of the interface between the outer sheath and the steel wire armor layer according to the formula: Pull-out strength = Fmax / (π*D*L), where D is the outer diameter of the steel wire armor layer (mm) and L is the contact length between the outer sheath and the steel wire armor layer (mm). 3) Longitudinal peel test for peel strength: Referring to ASTM D903, the test method for the peel strength of the sheath of wires and cables (UL 1581 / GB / T 12706): make a 150 mm long cut along the longitudinal direction of the cable through the outer sheath. At the end of the cut, peel off a 20 mm long strip from the outer sheath. Clamp the cable body (including the armor layer) in the lower fixture of the testing machine, and clamp the stripped section in the upper fixture. Peel at 180° at a peeling speed of 100 mm / min. Record the average peel force P (N). Calculate the peel strength between the outer sheath and the steel wire armor layer according to the formula peel strength = P / W, where W is the width of the sample. 4) Electrochemical impedance spectroscopy (EIS) test: Referring to ASTM G106 and the EIS test principle for coated metals: Take a 150mm long cable section, peel off 10mm of the outer sheath from one end of the cable to expose the armored steel wire, weld the conductor, seal the weld point and exposed steel wire with epoxy resin, and completely immerse the remaining 140mm of the cable in an artificial seawater electrolysis cell, keeping the outer sheath intact. Use the cable armor layer (leading out through the conductor) as the working electrode, the saturated calomel electrode (SCE) as the reference electrode, and a platinum sheet as the auxiliary electrode, at a disturbance voltage of 10mV (rms) and a frequency range of 10... 5 Hz-10 -2 Under the conditions of Hz and test area being the surface area of ​​the outer sheath of the submerged section, the impedance modulus of the test cable |Z| 0.01Hz (Ω.cm) 2 ); 5) Corrosion weight loss method for testing mass change rate: Referring to ASTM G1 – Corrosion Specimen Cleaning and Weighing Standard: After the cable is soaked for 90 days, it is taken out, the entire outer sheath is mechanically stripped, all armored steel wires are removed, the steel wires are immersed in rust removal solution (ammonium citrate + ultrasonic) to remove corrosion products, dried and weighed, and the mass W1 is recorded. It is compared with the initial mass W0 (unsoaked steel wires of the same batch), and the mass change rate is calculated according to the formula ΔW = (W1-W0) / W0*100%. The test results are shown in Table 1.

[0036] Table 1 Performance test data of steel wire armored cables in Examples 1-3 and Comparative Examples 1-3

[0037] As shown in Table 1, the cables prepared in Examples 1-3 of this invention, after being immersed in artificial seawater, exhibited superior appearance, tensile strength, peel strength, EIS, and steel wire corrosion weight loss compared to the cables prepared in Comparative Examples 1-3. This indicates that the cables prepared in Examples 1-3, compared to those in Comparative Examples 1-3, have stronger interfacial bonding between the steel wire armor layer and the polyurethane outer sheath, better corrosion resistance, and better structural stability and service reliability in marine high-humidity and corrosive environments. This is because: 1) In Examples 1-3, the galvanized steel wire, after surface cleaning, undergoes acidic ultrasonic micro-etching, oxidation treatment, activation treatment, online silane vapor phase pre-implantation treatment, and silanization treatment in sequence. Among these, acidic ultrasonic micro-etching can form nanoscale roughness, enhance the mechanical anchoring of the subsequent oxide layer and silane layer, and introduce a large number of hydroxyl groups, which are key precursors for forming strong chemical bonds (Si-OM) with silane molecules; oxidation treatment can form a metal oxide film, providing sufficient reaction sites (chemical anchoring) for the subsequent silane layer; activation treatment can clean and modify the oxide film surface, introducing a large number of -OH (hydroxyl), -COOH (carboxyl), and C=O (carbonyl) groups. The presence of equally polar oxygen-containing functional groups significantly enhances the surface energy and functional group density of the steel wire. The silane molecules introduced by the online silane vapor-phase pre-treatment directly condense with the hydroxyl groups on the surface of the metal (M) oxide film, forming Si-OM bonds, while simultaneously providing a perfect chemical bonding basis for subsequent silanization treatment. The composite treatment liquid used in the silanization treatment not only undergoes hydrolysis and condensation reactions with the oxide film on the steel wire surface to form stable silicon-oxygen bonds, thus constructing a continuous interface modification layer on the steel wire surface, but also interacts with the polar groups in the polyurethane outer sheath. The synergistic effect of multiple treatment steps, combining mechanical anchoring and chemical bonding, achieves a high-strength interface bond between the steel wire armor layer and the polyurethane outer sheath, effectively improving the structural stability and service reliability of the cable in marine high-humidity and corrosive environments. In contrast, several modification steps were missing in Comparative Examples 1-3, and the synergistic effect between the steps was weak, resulting in a significantly lower interfacial bonding strength between the steel wire armor layer and the polyurethane outer sheath compared to the Examples. 2) Examples 1 and 3 employ molybdate oxidation to form zinc molybdate composite oxide, which not only provides sufficient reaction sites for the subsequent silane layer but also possesses active corrosion protection capabilities. Example 2 uses low-temperature gradient oxidation, resulting in an oxide film rich in hydroxyl groups and with uniform thickness. This provides sufficient reaction sites without reducing the protective performance of the zinc plating layer or generating internal stress due to excessive thickness. In contrast, Comparative Examples 1 and 3 involve direct low-temperature isothermal oxidation at 120°C. Compared to the zinc molybdate composite oxide of Example 1, it lacks active corrosion protection capabilities. Compared to the oxide film of Example 2, it has poor density, structural defects, and cannot provide sufficient reaction sites. Consequently, the interfacial bonding strength and corrosion resistance of the cables in Examples 1-3 are superior to those in Comparative Examples 1 and 3, effectively improving the structural stability and service reliability of the cables in marine high-humidity and corrosive environments. 3) In the silanization treatment of Examples 1-3, a composite treatment solution including γ-APS, GPTMS, modified graphene oxide, benzotriazole, and cerium nitrate was used. γ-APS and GPTMS were combined in a bissilane formulation. The amino groups of γ-APS condensed with the hydroxyl groups on the steel wire surface to form a strong anchor. Simultaneously, γ-APS served as ring-opening reaction sites for the epoxy groups of GPTMS, causing irreversible ring-opening crosslinking reactions with the amino / hydroxyl groups of the outer sheath TPU, forming covalent bridges across the interface and effectively enhancing interfacial adhesion. Modified graphene oxide contained amino functional groups, which could form covalent bonds with silanes and polyurethanes. It also possessed a good physical barrier effect, capable of blocking water, oxygen, and Cl-. - The penetration of benzotriazole and cerium nitrate can form a corrosion inhibition system. Benzotriazole is adsorbed onto the metal surface, and cerium nitrate provides Ce. 3+ / Ce 4+ The redox buffer capacity inhibits the cathodic reaction; while the treatment solution used in Comparative Examples 1-3 only contains γ-APS. γ-APS needs to condense with the hydroxyl groups on the metal surface (Si–O–M) and also interact with the resin. Once one side breaks, the entire interface fails, and the interface bonding is not strong. In the end, the interface bonding strength and corrosion resistance of the cables in Examples 1-3 are far superior to those in Comparative Examples 1-3, thereby effectively improving the structural stability and service reliability of the cables in marine high-humidity and corrosive environments. 4) The polyurethane used in the outer sheaths of Examples 1-3, compared to the polyurethane used in the outer sheaths of Comparative Examples 1-3, contains organomontmorillonite, bis(2-hydroxyethyl) disulfide (HEDS), and N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane: organomontmorillonite effectively improves the water / chemical corrosion resistance, mechanical properties, and thermal stability of the outer sheath, and also has a barrier effect, which can prolong the diffusion path of water molecules, thereby effectively enhancing the durability of the interface between the armor layer and the outer sheath; HEDS has a dynamic self-healing function, enabling the polyurethane to release residual stress at the interface, repair microcracks at the interface, and delay the cohesive failure of the polyurethane; N-(β-hydroxyethyl)-γ-aminopropyltrimethoxysilane... (-aminoethyl)-γ-aminopropyltrimethoxysilane can react with isocyanates in polyurethane, chemically bonding into the polyurethane backbone and introducing siloxane groups into the polyurethane resin body. The siloxane groups in the molecule hydrolyze to generate Si-OH, which can undergo ring-opening reaction with the epoxy groups of GPTMS in the composite treatment solution to form cross-interface covalent bridges, thereby improving the water resistance of the polyurethane body. Ultimately, this results in the polyurethane outer sheath in Examples 1-3 having better water resistance and corrosion resistance, effectively improving the interfacial bonding strength between the polyurethane outer sheath and the armor layer, thus effectively improving the structural stability and service reliability of the cable in marine high-humidity and corrosive environments.

[0038] Finally, it should be noted that the above are only some preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An interface-enhanced marine steel wire armored cable, characterized in that, From the inside out, it includes a cable core, a polyurethane watertight layer, a steel wire armor layer, and a polyurethane outer sheath. The steel wire armor layer is assembled from modified galvanized steel wires that have undergone surface modification treatment. The modified galvanized steel wire is obtained by sequentially cleaning the galvanized steel wire to remove surface adhesive contaminants, acidic ultrasonic micro-etching, oxidation treatment to form a uniform and continuous metal oxide film on the surface, activation treatment to increase surface energy and functional group density, online silane vapor phase pre-planting treatment, and silanization treatment. The online silane vapor phase pre-planting treatment involves placing the activated galvanized steel wire in saturated vapor of silane coupling agent for vapor phase treatment for 30-60 seconds. The silanization process involves immersing the galvanized steel wire, which has undergone online silane vapor phase pre-treatment, in a composite treatment solution containing a silane coupling agent and ultrasonically treating it for 3-5 minutes. Then, the wire is removed, cleaned, cured, and cooled to obtain the modified galvanized steel wire. The composite treatment liquid has the following composition and ratio: γ-aminopropyltriethoxysilane: 1.7-1.9 parts by weight; 3-Glycidyl etheroxypropyltrimethoxysilane: 1.1-1.3 parts by weight; Modified graphene oxide: 0.9-1.1 parts by weight; Benzotriazole: 0.25-0.35 parts by weight; Cerium nitrate: 0.05-0.15 parts by weight; Ethanol: 80-90 parts by weight; Glacial acetic acid: 0.05-3 parts by weight; Deionized water: 8-12 parts by weight; The modified graphene oxide is graphene oxide modified with γ-aminopropyltriethoxysilane.

2. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that, The preparation of the composite treatment solution includes the following steps: Disperse the specified amounts of benzotriazole and cerium nitrate in a portion of the specified amount of ethanol to obtain a corrosion-inhibiting solution; Modified graphene oxide was uniformly dispersed in the remaining amount of ethanol. γ-aminopropyltriethoxysilane and 3-glycidyl etheroxypropyltrimethoxysilane were added and stirred until homogeneous. Then, deionized water and corrosion inhibitor were added, and glacial acetic acid was added to adjust the pH to 4.1-4.

3. The resulting mixture was stirred and hydrolyzed for 3-5 hours at room temperature and in the dark to obtain the composite treatment solution.

3. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that: In the online silane gas-phase pre-planting process, the silane coupling agent used is γ-aminopropyltriethoxysilane.

4. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that: The galvanized steel wire is cleaned to remove surface contaminants, including the following steps: Immerse the galvanized steel wire in a 2-5wt% alkaline cleaning agent solution at 60-70℃, ultrasonically treat for 5-15 minutes, remove and wash with water.

5. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that: The acidic ultrasonic micro-etching method includes the following operations: After cleaning, the galvanized steel wire is immersed in a 1-3 wt% citric acid aqueous solution at room temperature, ultrasonically treated for 1-3 minutes, removed, washed with water, and dried.

6. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that, The oxidation treatment is either chemical oxidation or low-temperature thermal oxidation. The chemical oxidation treatment involves immersing the galvanized steel wire, after acidic ultrasonic micro-etching, in an acidic aqueous solution of 6-10 g / L sodium molybdate for 2-5 minutes at room temperature, then removing and rinsing with water. The aforementioned low-temperature thermal oxidation treatment involves placing the galvanized steel wire, after acidic ultrasonic micro-etching, in an oxygen-containing atmosphere and thermally oxidizing it at 90-130℃ for 20-30 minutes.

7. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that: The activation treatment is selected from any one of plasma activation, corona discharge activation, and flame activation.

8. The interface-enhanced marine steel wire armored cable according to claim 1, characterized in that, The polyurethane resin used in both the polyurethane watertight layer and the polyurethane outer sheath has the following composition and proportions: Polytetrahydrofuran ether diol: 100 parts by weight; Isophorone diisocyanate: 16-20 parts by weight; Hydrogenated diphenylmethylene diisocyanate: 6-8 parts by weight; 1,4-Butanediol: 4-5 parts by weight; Bis(2-hydroxyethyl) disulfide: 5-6 parts by weight; N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane: 1.4-1.6 parts by weight; Black TPU masterbatch: 5.5-6.5 parts by weight; Organo-montmorillonite: 3.5-4.5 parts by weight; Zinc phosphate: 2.8-3.2 parts by weight; Anti-hydrolysis agent: 1.4-1.6 parts by weight; Light stabilizer: 0.8-1.2 parts by weight; Internal release agent: 0.4-0.6 parts by weight; Organic bismuth catalyst: 0.02-0.05 parts by mass.

9. The interface-enhanced marine steel wire armored cable according to claim 8, characterized in that: The preparation of the polyurethane resin includes the following steps: 1) Mix the specified amounts of 1,4-butanediol, bis(2-hydroxyethyl) disulfide, and organic bismuth catalyst evenly and preheat to 60°C to obtain a chain extender / catalyst mixture; Add the specified amount of polytetrahydrofuran ether glycol to the reactor and dehydrate it for 2-3 hours at 120℃ and a vacuum degree <-0.095MPa until the water content is <0.03%. Under nitrogen protection, add the specified amount of isophorone diisocyanate to the dehydrated polytetrahydrofuran ether glycol and stir the reaction at 83-87℃ for 2.5-3 hours. Then, cool the temperature to 68-72℃ and simultaneously add the specified amount of hydrogenated diphenylmethylene diisocyanate and chain extender / catalyst mixture through different feed ports. After the addition is complete, stir and mix evenly, then stop stirring, evacuate the reactor, and maintain the temperature at 70-75℃ for 15-20 minutes for vacuum degassing to obtain polyurethane melt. 2) Mix the black TPU masterbatch, organomontmorillonite, zinc phosphate, anti-hydrolysis agent, light stabilizer, and internal release agent in a high-speed mixer to obtain a mixture; add the obtained mixture to the polyurethane melt, feed the resulting mixture into a twin-screw extruder for melt blending, and then extrude, water cool, pelletize, and cure to obtain polyurethane resin.

10. A method for preparing an interface-reinforced marine steel wire armored cable according to any one of claims 1-9, characterized in that, Includes the following steps: a) The galvanized steel wire is sequentially cleaned to remove surface adhesive contaminants, acidic ultrasonic micro-etched, oxidized to form a uniform and continuous metal oxide film on the surface, activated to increase surface energy and functional group density, and subjected to online silane vapor phase pre-planting and silanization treatments to obtain modified galvanized steel wire. b) A continuous, dense, watertight polyurethane layer is extruded onto the outside of the cable core; c) After the watertight layer is extruded and cooled, the modified galvanized steel wire is wound in a double-layer reverse manner to form a steel wire armor layer on the outside of the polyurethane watertight layer. d) After completing the double-layer steel wire armor, a polyurethane outer sheath is extruded onto the outer surface of the steel wire armor layer through an extrusion process to obtain an interface-enhanced marine steel wire armored cable.

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