High-performance ship cable and preparation process thereof

Abstract

The invention discloses a high-performance ship cable and a preparation process thereof, relates to the technical field of cables, and aims to solve the problem that an existing cable is insufficient in environmental adaptability, safety, electromagnetic compatibility and the like, the cable comprises a conductor, an insulating layer, a longitudinal waterproof structure, a shielding layer and a sheath layer from inside to outside, the conductor is of a multi-strand soft copper wire stranded structure, and the copper content of the multi-strand soft copper wire stranded structure is larger than or equal to 99.95%; the DC resistance at 20 DEG C is less than or equal to 0.01724 omega mm / m; the insulating layer is made of cross-linked polyethylene or polytetrafluoroethylene and can resist 1.5 times of rated voltage for 1 minute without breakdown; the longitudinal waterproof structure comprises a water-blocking tape and water-blocking paste; the shielding layer is of a double-layer structure, and the shielding effectiveness is larger than or equal to 60 dB The sheath layer is made of a low-smoke halogen-free flame-retardant material and contains an antioxidant and an ultraviolet light absorber, the preparation process comprises six steps of conductor preparation, insulating layer forming and the like, parameters are accurately controlled, the cable can work at the temperature of-40 DEG C to 85 DEG C, is salt-fog-resistant, waterproof and flame-retardant, is adaptive to the complex environment of ships and warships, and the operation reliability and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a high-performance ship cable and its manufacturing process. Background Technology

[0002] In the field of naval equipment, cables, as the core carriers of power transmission and signal transmission, directly affect the overall operational reliability and safety of ships. However, existing ship cables generally suffer from the following technical shortcomings, making it difficult to meet the complex and demanding usage requirements of modern ships: Insufficient environmental adaptability: Traditional cables mostly use ordinary rubber or polyethylene materials. In marine environments with high salt spray and high humidity, the sheath is prone to corrosion and cracking, and the conductor is prone to corrosion. After 1000 hours of salt spray test, the conductor resistance change rate often exceeds 30%. They cannot withstand wide temperature fluctuations of -40℃ to 85℃ for a long time. They are prone to embrittlement and breakage at low temperatures and significant degradation of insulation performance at high temperatures.

[0003] Safety performance defects: Most conventional cables do not have low smoke and halogen-free characteristics. When burning, they release a large amount of toxic halogen gas (halogen acid gas content is often >10mg / g) and have high smoke concentration (light transmittance <40%). In the closed cabins of ships, this can cause poisoning of personnel, obstruct vision, and exacerbate the fire hazard. Some cables have insufficient flame retardant properties. When they burn in bundles, the flame spreads for more than 2m, making it difficult to stop the spread of fire.

[0004] Poor waterproofing and electromagnetic compatibility: Traditional cables mostly rely on a single sheath for waterproofing and lack a longitudinal waterproofing structure. Once the sheath is damaged, moisture can easily penetrate along the cable axis, causing the entire cable to fail. The shielding layer is mostly a single-layer structure (such as a single copper wire braid), and the shielding effectiveness is often <40dB in the 30MHz~1GHz frequency band. It is susceptible to electromagnetic interference from ship radar, power systems, etc., which can lead to signal transmission distortion and affect the accuracy of navigation and communication systems.

[0005] Poor mechanical performance and durability: The conductors are mostly made of single-strand hard copper or sparsely stranded soft copper, which have weak resistance to vibration and bending. In the high-frequency vibration environment (10Hz~2000Hz) of the ship's engine room, the conductors are prone to breakage. The sheath has insufficient wear resistance and aging resistance. After long-term use, it is prone to hardening and cracking. The design life is mostly <10 years, which requires frequent replacement, increasing the ship's maintenance costs and downtime risks.

[0006] Insufficient process stability: The existing manufacturing process lacks precise parameter control, such as large fluctuations in conductor stranding pitch (often deviating from the design value by more than 20%), insulation layer extrusion thickness deviation exceeding ±0.2mm, and lack of strict control over workshop cleanliness (mostly <Class 10000) and tension consistency, resulting in large differences in cable batch performance, and some products failing to pass key tests such as voltage resistance and waterproofing. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a high-performance ship cable and its manufacturing process.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-performance ship cable and its manufacturing process, comprising, from the inside out, a conductor, an insulation layer, a longitudinal waterproof structure, a shielding layer, and a sheath layer; The conductor is a multi-strand soft copper wire stranded structure with a copper content ≥99.95% and a DC resistance ≤0.01724Ω・mm² / m at 20℃; The insulation layer is made of cross-linked polyethylene or polytetrafluoroethylene with a thickness of 0.8~2.5mm. It shows no breakdown after being tested at 20℃ and 90℃ with 1.5 times the rated voltage for 1 minute. The longitudinal waterproof structure includes a water-blocking tape wrapping layer with an overlap rate of ≥30% and a water-blocking paste filling layer. The shielding layer is a double-layer structure consisting of an aluminum-plastic composite tape wrapping layer (overlap rate ≥25%) and a copper wire braided layer (braiding density ≥90%). The sheath layer is made of low-smoke halogen-free flame-retardant material, with 0.3~0.5% antioxidant and 0.2~0.3% ultraviolet absorber added, and has a thickness of 1.2~3.0mm; The cable operates stably at temperatures ranging from -40℃ to 85℃, with a shielding effectiveness of ≥60dB at 30MHz to 1GHz. After a 1000-hour salt spray test, the conductor resistance change rate is ≤20%. It exhibits no water leakage under 0.1MPa water pressure for 1 hour. During combustion, the light transmittance is ≥60% and the halogen acid gas content is ≤5mg / g.

[0009] Preferably, the stranding pitch of the multi-strand soft copper wire is 10 to 15 times the outer diameter of the conductor, and it is subjected to nitrogen protection annealing treatment at 380 to 420°C; the diameter of the soft copper wire is 0.2 to 0.5 mm, and the tensile strength is ≥300 MPa.

[0010] Preferably, if the insulating layer is cross-linked polyethylene, it is cross-linked by 10~15MeV electron beam irradiation and has a gel content ≥75%; if it is polytetrafluoroethylene, it is extruded at 380~400℃ and sintered at 280℃×2h and has a dielectric loss tangent tanδ≤0.005 (20℃). Preferably, the water-blocking paste fills the gap between the water-blocking tape and the insulating layer, with a filling amount of 1.2 times the gap volume and a viscosity of 5000~8000 mPa·s; The longitudinal waterproof structure was tested according to GB / T18380.41 and showed no water penetration along the axial direction within 24 hours.

[0011] Preferably, the copper wire braided layer uses tin-plated copper wire with a diameter of 0.15~0.2mm, double-layer braided (inner layer left-handed, outer layer right-handed), with a braiding tension of 2~4N; the aluminum-plastic composite strip has a thickness deviation of ±0.02mm and is compacted by a pressure of 0.3~0.5MPa.

[0012] Preferably, the sheath material is chloroprene rubber, polyether polyurethane, or EPDM rubber, which is extruded at 150~170℃ and shaped in cold water at 20~30℃, with a heat shrinkage rate of ≤2%; after being soaked in diesel fuel at 70℃ for 24 hours, the volume change rate is ≤10%, and there is no swelling or cracking.

[0013] Preferably, the outer periphery of the sheath layer is provided with a steel wire armor layer, the steel wire diameter is 0.8~1.5mm, the armor pitch is 12~18 times the steel wire diameter, and the surface is coated with a 0.05~0.1mm anti-corrosion coating.

[0014] Preferred, Step (1) Conductor preparation: The electrolytic copper rod is drawn into a soft copper wire of 0.2~0.5mm, and then stranded in a cage stranding machine at a pitch of 10~15 times, and annealed under nitrogen protection at 380~420℃; Step (2) Insulation layer forming: The insulation material is extruded using a three-layer co-extrusion die head. Cross-linked polyethylene needs to be irradiated with 10~15MeV electron beam (absorbed dose 100~150kGy), and polytetrafluoroethylene needs to be extruded at 380~400℃ and then sintered at 280℃. Step (3) Waterproof structure processing: Wrap the water-blocking tape with an overlap rate of ≥30% and fill the gaps with 1.2 times the volume of water-blocking paste; Step (4) Shielding layer composite: Aluminum-plastic composite tape is longitudinally wrapped and compacted with an overlap rate of ≥25%, and tin-plated copper wire is double-woven with a density of ≥90%; Step (5) Sheath extrusion: Low smoke halogen-free material is extruded at 150~170℃ and shaped in cold water at 20~30℃. Outdoor cables need to be additionally armored with steel wire. Step (6) Performance enhancement: 70℃ oven treatment for 48h to eliminate internal stress, and engine compartment cables are subjected to high temperature setting at 120℃ for 2h.

[0015] Preferably, in step (1), the twisting tension is controlled at 5~8N and the drawing speed is 8~12m / s; In step (2), the extrusion screw speed is 20~30 r / min and the traction speed is 1~10 m / min; In step (5), the sheath extrusion tension fluctuation is ≤ ±5%, and the workshop cleanliness is ≥ Class 10000.

[0016] Compared with the prior art, the present invention provides a high-performance ship cable and its manufacturing process, which has the following beneficial effects: 1. This high-performance marine cable and its manufacturing process, with its long life and low failure rate, can reduce the number of cable replacements during the service life of ships, and reduce maintenance time and material costs. At the same time, the low-smoke halogen-free materials and efficient shielding structure can reduce the cost of equipment repair and personnel rescue after a fire, resulting in significant overall economic benefits.

[0017] 2. This high-performance marine cable and its manufacturing process: The conductor uses high-purity soft copper with a copper content of ≥99.95%, which undergoes nitrogen-protected annealing treatment. After 1000 hours of salt spray testing, the conductor resistance change rate is ≤20%. The sheath is supplemented with 0.3~0.5% antioxidant and 0.2~0.3% UV absorber, allowing it to operate stably in a wide temperature range of -40℃ to 85℃. When used outdoors, it can resist UV aging and has a design life of ≥15 years, which is more than 50% longer than traditional cables. The conductor is made of multi-strand soft copper wire with a stranding tension controlled at 5~8N. The minimum bending radius is ≤6 times the cable outer diameter. After 1000 repeated bending tests, the conductor resistance change rate is ≤5%. After wide-frequency vibration testing, there is no conductor breakage or sheath damage, making it suitable for dynamic scenarios such as engine compartments and ship turbulence.

[0018] 3. This high-performance marine cable and its manufacturing process innovatively adopt a longitudinal waterproof structure of "water-blocking tape wrapping + water-blocking paste filling". No water can penetrate along the axis within 24 hours. Even if the sheath is damaged, the core function of the cable can still be guaranteed. It is suitable for humid environments such as the bottom of the tank and immersion.

[0019] 4. The high-performance marine cable and its manufacturing process feature a sheath made of low-smoke, halogen-free flame-retardant material. During combustion, the light transmittance is ≥60%, and the halogen acid gas content is ≤5mg / g, which can reduce the hazards of toxic gases and smoke in a fire. The engine room cable meets the bundled combustion test, and the emergency cable can maintain uninterrupted power supply for 3 hours in a 750℃ flame, providing safety assurance for ship emergency response. The sheath thickness is 1.2~3.0mm, and the wear depth is ≤1mm after abrasion resistance testing. The cable is additionally equipped with a steel wire armor layer, which increases the drag resistance by more than 40%, reducing the risk of damage during wiring and maintenance.

[0020] 5. The high-performance marine cable and its manufacturing process use cross-linked polyethylene or polytetrafluoroethylene for the insulation layer, with the thickness precisely controlled between 0.8 and 2.5 mm. It can withstand 1.5 times the rated voltage for 1 minute at 20°C and 90°C without breakdown, effectively avoiding the risk of leakage and short circuit.

[0021] 6. The high-performance marine cable and its manufacturing process adopt an "aluminum-plastic composite tape wrapping + tinned copper wire braiding" structure for the shielding layer. The shielding effectiveness is ≥60dB in the 30MHz~1GHz frequency band, which can isolate electromagnetic interference generated by the ship's power system and radar equipment. At the same time, it prevents the cable's own electromagnetic field from affecting the navigation and communication system, ensuring that the high-frequency signal transmission attenuation is ≤20dB / 100m and the signal distortion rate is greatly reduced. Detailed Implementation

[0022] 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.

[0023] A high-performance marine cable, comprising, from the inside out, a conductor, an insulation layer, a longitudinal waterproof structure, a shielding layer, and a sheath layer: Conductor: Employing a multi-strand soft copper wire stranded structure, using high-purity oxygen-free copper with a copper content ≥99.95%, ensuring excellent conductivity. At a standard temperature of 20℃, the DC resistance is strictly controlled to ≤0.01724Ω・mm² / m, a 15%-20% reduction compared to ordinary cables, effectively minimizing power transmission loss. The stranding process utilizes a special untwisting technique, ensuring tight bonding of the copper wires, enhancing the cable's flexibility and mechanical strength, meeting the frequent bending requirements of the complex environment of ships.

[0024] Insulation layer: Cross-linked polyethylene or polytetrafluoroethylene (PTFE) is selected as the insulation material. The former has excellent electrical insulation properties and heat aging resistance, while the latter has outstanding chemical stability and high and low temperature resistance. The insulation layer thickness is precisely controlled within the range of 0.8-2.5mm according to the cable specifications. Rigorous electrical performance testing is conducted: under typical operating temperatures of 20℃ and 90℃, a voltage of 1.5 times the rated voltage is applied for 1 minute without breakdown, ensuring the safe operation of the cable under various working conditions.

[0025] Longitudinal waterproof structure: It adopts a double waterproof design, consisting of a water-blocking tape wrapping layer with an overlap rate of ≥30% and a water-blocking paste filling layer. The water-blocking tape is made of highly absorbent resin material, which expands rapidly upon contact with water to form a dense waterproof barrier; the water-blocking paste uses a special formula to fill the gaps inside the cable, effectively preventing water from penetrating longitudinally and ensuring the reliability of the cable in harsh environments such as humidity and immersion.

[0026] Shielding Layer: A double-layer shielding structure is constructed, consisting of an aluminum-plastic composite tape wrapping layer and a copper wire braided layer. The aluminum-plastic composite tape wrapping overlap rate is ≥25%, effectively blocking electromagnetic interference by utilizing the high reflectivity of the aluminum layer and the insulation of the plastic layer. The copper wire braided layer has a braiding density of ≥90%, further enhancing the shielding effect through its fine metal mesh structure. This double-layer structure ensures that the cable's shielding effectiveness remains stable at ≥60dB within the 30MHz-1GHz frequency band, meeting the signal transmission requirements of the complex electromagnetic environment of ships.

[0027] Sheath layer: Made of low-smoke halogen-free flame-retardant material, with added 0.3-0.5% antioxidant and 0.2-0.3% UV absorber, with a thickness controlled at 1.2-3.0mm. The antioxidant effectively delays material aging and extends cable lifespan; the UV absorber resists material degradation caused by sunlight. After rigorous performance testing, this cable can operate stably within a wide temperature range of -40℃ to 85℃; after withstanding 1000 hours of salt spray testing, the conductor resistance change rate is ≤20%, demonstrating excellent corrosion resistance; no water leakage occurs after 1 hour of continuous operation under 0.1MPa water pressure; during combustion, the light transmittance is ≥60% and the halogen acid gas content is ≤5mg / g, meeting environmental safety standards and reducing fire hazards.

[0028] Stranding Pitch Design: The multi-strand soft copper wires employ an optimized stranding process, with the stranding pitch precisely controlled within 10 to 15 times the conductor's outer diameter. This parameter setting effectively balances cable flexibility and electrical transmission performance, meeting the bending requirements of complex shipboard wiring environments while reducing the increase in conductor resistance caused by excessively dense stranding.

[0029] Annealing process: Nitrogen-protected annealing is performed at 380~420℃. The inert gas isolates oxygen and prevents oxidation of the soft copper wire during high-temperature treatment. At the same time, this temperature range can effectively eliminate the work hardening phenomenon of copper wire and improve its flexibility and ductility.

[0030] Copper wire specifications: The diameter of the soft copper wire ranges from 0.2 to 0.5 mm, which balances the current carrying capacity and flexibility of the cable; its tensile strength is ≥300 MPa, ensuring the structural stability and service life of the cable under complex working conditions such as ship vibration and tension.

[0031] If the insulation layer is made of cross-linked polyethylene, it needs to be treated with a 10-15 MeV electron beam irradiation cross-linking process. This high-energy electron beam can effectively break the polyethylene molecular chains and re-cross-link them, forming a stable three-dimensional network structure, thereby significantly improving the material's heat resistance and mechanical properties. Through strict process control, the gel content of the cross-linked polyethylene insulation layer needs to reach ≥75% to ensure that the cable can maintain good electrical insulation performance and physical stability under extreme environments such as high temperature and high pressure.

[0032] If polytetrafluoroethylene (PTFE) is selected as the insulation material, a special processing technique is required: First, extrusion molding is performed at a high temperature of 380~400℃ to fully melt the PTFE powder and form a continuous and dense insulation layer; then, sintering is carried out at 280℃ for 2 hours. This process effectively eliminates internal stress in the material and optimizes molecular crystallinity. After this process, the PTFE insulation layer has a dielectric loss tangent of tanδ ≤ 0.005 at 20℃, exhibiting extremely low dielectric loss characteristics. This significantly reduces energy loss during power transmission, improving the overall transmission efficiency and service life of the cable.

[0033] The water-blocking paste, as the core material for longitudinal waterproofing, is precisely filled into the annular gap between the water-blocking tape and the insulation layer. Through repeated testing, its filling amount must be strictly controlled to 1.2 times the gap volume. This parameter ensures a dense, gap-free waterproof structure while preventing a decrease in cable flexibility due to overfilling. The viscosity of the water-blocking paste is set within the range of 5000~8000 mPa·s. This range allows the paste to maintain good fluidity at room temperature, fully penetrating into minute gaps during cable forming, while maintaining a stable paste-like consistency in the usage environment to prevent migration and loss due to external pressure. Under simulated immersion conditions for 24 hours, the longitudinal waterproofing structure successfully achieved zero water penetration along the cable axis, fully demonstrating the reliability and long-term effectiveness of the waterproofing structure.

[0034] The copper wire braided layer uses high-purity tin-plated copper wire with a diameter of 0.15~0.2mm, and the tin plating thickness is controlled at 0.002~0.003mm, effectively improving the copper wire's oxidation resistance and electrical connection stability. A double-layer braided structure is adopted, with the inner layer tightly wound in a left-hand spiral and the outer layer overlapping and covering in a right-hand spiral, forming an interlocking protective network. During the braiding process, a precision tension control system maintains the braiding tension at 2~4N, ensuring a uniform and tight braided layer, guaranteeing good electromagnetic shielding while preventing damage to the copper wire due to excessive tension.

[0035] The aluminum-plastic composite tape is made of aluminum foil and a high-molecular polymer. Its thickness standard value is set according to the cable specifications, and the allowable deviation is controlled within ±0.02mm. During the composite tape forming process, a constant pressure of 0.3~0.5MPa is used to compact it, so that the aluminum foil and polymer layer are fully fused to form a dense, bubble-free composite structure, which effectively enhances the cable's moisture resistance, corrosion resistance, and mechanical protection performance.

[0036] The sheath layer is made of high-performance elastomers such as neoprene rubber, polyether polyurethane, or EPDM rubber. During production, the material is first extruded using a twin-screw extruder at a high temperature of 150-170℃, ensuring full plasticization and uniform coating of the cable core surface. It is then immediately immersed in a circulating cooling water setting tank at 20-30℃ for rapid curing through a quenching process, ensuring dimensional accuracy and surface smoothness of the sheath layer. Testing shows that the sheath layer exhibits excellent dimensional stability with a thermal shrinkage rate of ≤2% under high-temperature conditions. After immersion in 70℃ diesel fuel for 24 hours, the volume change rate is ≤10%, with no swelling or cracking, demonstrating its ability to maintain structural integrity even in fuel contact environments, fully meeting the protection requirements of high-performance ships under complex operating conditions.

[0037] The outer perimeter of the sheath layer is equipped with a steel wire armor layer. The steel wire is made of high-strength galvanized low-carbon steel wire, with a diameter strictly controlled within the range of 0.8~1.5mm. This specification ensures both the mechanical protection strength of the cable and the bending flexibility during laying. The armor pitch is designed to be 12~18 times the diameter of the steel wire, forming a tightly wound spiral structure through precise calculations, effectively dispersing external impact forces and drag stress. The surface is coated with a 0.05~0.1mm thick special anti-corrosion coating, which is composed of epoxy resin and nano-grade zinc powder. It has excellent salt spray and UV resistance, and can maintain its complete protective effect after 720 hours of salt spray testing.

[0038] The sheath layer must ensure that the flame spreads no more than 1.5 meters across the cable bundle, the extinguishing time is controlled within 60 seconds, and no ignition drips are generated during combustion, thereby effectively avoiding the risk of fire spread. For emergency cables, the performance requirements are even more stringent: they must maintain uninterrupted power supply for 3 hours in a continuous flame at 750°C, ensuring the stability and reliability of power supply in emergencies and providing a solid guarantee for the operation of critical ship systems and emergency response.

[0039] A manufacturing process for a high-performance shipboard cable includes the following steps: Step (1) Conductor preparation: The electrolytic copper rod is drawn into a soft copper wire of 0.2~0.5mm, and then stranded in a cage stranding machine at a pitch of 10~15 times, and annealed under nitrogen protection at 380~420℃; Step (2) Insulation layer forming: The insulation material is extruded using a three-layer co-extrusion die head. Cross-linked polyethylene needs to be irradiated with 10~15MeV electron beam (absorbed dose 100~150kGy), and polytetrafluoroethylene needs to be extruded at 380~400℃ and then sintered at 280℃. Step (3) Waterproof structure processing: Wrap the water-blocking tape with an overlap rate of ≥30% and fill the gaps with 1.2 times the volume of water-blocking paste; Step (4) Shielding layer composite: Aluminum-plastic composite tape is longitudinally wrapped and compacted with an overlap rate of ≥25%, and tin-plated copper wire is double-woven with a density of ≥90%; Step (5) Sheath extrusion: Low smoke halogen-free material is extruded at 150~170℃ and shaped in cold water at 20~30℃. Outdoor cables need to be additionally armored with steel wire. Step (6) Performance enhancement: 70℃ oven treatment for 48h to eliminate internal stress, and engine compartment cables are subjected to high temperature setting at 120℃ for 2h.

[0040] In step (1), the twisting tension is controlled at 5~8N and the drawing speed is 8~12m / s; in step (2), the extrusion screw speed is 20~30r / min and the traction speed is 8~10m / min (cross-linked polyethylene) or 1~2m / min (polytetrafluoroethylene); in step (5), the sheath extrusion tension fluctuation is ≤±5% and the workshop cleanliness is ≥Class10000.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high performance marine cable and process for its preparation, characterized in that: It comprises conductor, insulation layer, longitudinal waterproof structure, shielding layer and sheath layer from inside to outside; The conductor is a twisted structure of soft copper wire, the copper content is greater than or equal to 99.95%, and the direct current resistance at 20℃ is less than or equal to 0.01724Ω·mm² / m; The insulation layer is made of cross-linked polyethylene or polytetrafluoroethylene, the thickness is 0.8-2.5mm, and there is no breakdown after 1.5 times rated voltage test at 20℃ and 90℃ for 1min; The longitudinal waterproof structure comprises water-blocking tape wrapping layer and water-blocking paste filling layer with overlapping rate greater than or equal to 30%; The shielding layer is a double-layer structure of aluminum-plastic composite tape wrapping layer (overlapping rate greater than or equal to 25%) and copper wire braiding layer (braiding density greater than or equal to 90%); The sheath layer is made of low-smoke halogen-free flame-retardant material, 0.3-0.5% antioxidant and 0.2-0.3% ultraviolet absorber are added, and the thickness is 1.2-3.0mm; The cable is stable at -40℃-85℃, the shielding effectiveness is greater than or equal to 60dB at 30MHz-1GHz, the conductor resistance change rate is less than or equal to 20% after 1000h salt spray test, there is no water penetration under 0.1MPa water pressure for 1h, the light transmittance is greater than or equal to 60% and the halogen acid gas content is less than or equal to 5mg / g during combustion.

2. A high performance shipboard cable according to claim 1, characterised in that: The twisting pitch of the soft copper wire is 10-15 times of the outer diameter of the conductor, and the soft copper wire is annealed at 380-420℃ in nitrogen atmosphere; the diameter of the soft copper wire is 0.2-0.5mm, and the tensile strength is greater than or equal to 300MPa.

3. A high performance shipboard cable according to claim 1, characterized in that: If the insulation layer is cross-linked polyethylene, it is cross-linked by 10-15MeV electron beam irradiation, and the gel content is greater than or equal to 75%; if the insulation layer is polytetrafluoroethylene, it is extruded at 380-400℃ and sintered at 280℃ for 2h, and the dielectric loss tangent tanδ is less than or equal to 0.005 (20℃).

4. A high performance shipboard cable according to claim 3, characterised in that: The water-blocking paste is filled in the gap between the water-blocking tape and the insulation layer, and the filling amount is 1.2 times of the gap volume, and the viscosity is 5000-8000mPa·s; The longitudinal waterproof structure is tested by GB / T18380.41, and there is no water penetration along the axial direction within 24h.

5. A high performance shipboard cable according to claim 1, characterized in that: The copper wire braiding layer is made of tin-plated copper wire with diameter of 0.15-0.2mm, and the braiding is double-layer (left-handed in the inner layer and right-handed in the outer layer), and the braiding tension is 2-4N; the thickness deviation of the aluminum-plastic composite tape is ±0.02mm, and it is compacted by 0.3-0.5MPa pressure.

6. A high performance shipboard cable according to claim 1, characterized in that: The sheath layer material is chloroprene rubber, polyether polyurethane or ternary ethylene-propylene rubber, which is extruded at 150-170℃ and shaped by cold water at 20-30℃, and the thermal shrinkage rate is less than or equal to 2%; the volume change rate is less than or equal to 10% after 24h immersion in 70℃ diesel oil, and there is no swelling and cracking.

7. A high performance shipboard cable according to claim 1, characterized in that: A steel wire armor layer is arranged on the periphery of the sheath layer, the steel wire diameter is 0.8-1.5mm, the armor pitch is 12-18 times of the steel wire diameter, and the surface is coated with 0.05-0.1mm anticorrosion coating.

8. The preparation process of the high-performance ship cable according to any one of claims 1-7, characterized in that: Step (1) conductor preparation: electrolytic copper rod is drawn into 0.2-0.5mm soft copper wire, which is twisted by a cage-type twisting machine with a pitch of 10-15 times, and is annealed at 380-420℃ in nitrogen atmosphere. Step (2) insulation layer forming: three-layer co-extrusion head is used to extrude insulation material, cross-linked polyethylene needs to be irradiated by 10~15MeV electron beam (absorbed dose 100~150kGy), and polytetrafluoroethylene needs to be pushed at 380~400℃ and sintered at 280℃; Step (3) waterproof structure processing: water-blocking tape is wrapped with ≥30% overlap rate, and gap is filled with 1.2 times volume water-blocking paste; Step (4) shielding layer compounding: aluminum plastic composite tape is longitudinally wrapped and compacted with ≥25% overlap rate, and tinned copper wire is double-woven with ≥90% density; Step (5) sheath extrusion: low-smoke halogen-free material is extruded at 150~170℃, and 20~30℃ cold water is used for setting, and open-air cable needs to be additionally armored with steel wire; Step (6) performance strengthening: 70℃ oven treatment for 48h is used to eliminate internal stress, and engine compartment cable is high-temperature set at 120℃×2h.

9. The process for the preparation of a high performance cable for naval vessels according to claim 1, characterized in that: In step (1), the twisting tension is controlled to be 5~8N, and the wire drawing speed is 8~12m / s; In step (2), the extrusion screw rotation speed is 20~30r / min, and the traction speed is 1~10m / min; In step (5), the sheath extrusion tension fluctuation is ≤±5%, and the workshop cleanliness is ≥Class10000.