A salt spray resistant and anti-aging marine shielded cable

Abstract

This utility model discloses a salt spray resistant and aging-resistant marine shielded cable, comprising a cable core composed of multiple strands of wire twisted together; halogen-free high flame-retardant rope filling the gaps in the cable core; a graphene composite thermoplastic semi-conductive shielding layer covering the cable core; a fluororubber inner anti-salt spray layer outside the graphene composite thermoplastic semi-conductive shielding layer; a nano-insulating water-blocking tape wrapped around the fluororubber inner anti-salt spray layer; a galvanized steel wire braided armor layer outside the nano-insulating water-blocking tape; an outer anti-salt spray coating outside the galvanized steel wire braided armor layer; a high-temperature resistant aluminum silicate fiber tape outside the outer anti-salt spray coating; and a polytetrafluoroethylene propylene outer sheath extruded outside the high-temperature resistant aluminum silicate fiber tape. Through this multi-layered composite structure design, the cable's insulation, corrosion resistance, aging resistance, and mechanical protection capabilities in salt spray, humidity, and strong vibration environments are improved, while also enhancing electromagnetic shielding and ensuring the stable operation of the ship's electrical system.

Description

Technical Field

[0001] This utility model relates to the field of wires and cables, specifically to a salt spray resistant and anti-aging marine shielded cable. Background Technology

[0002] When ships operate in marine environments, their electrical systems are constantly exposed to harsh conditions such as high salt spray, high humidity, strong ultraviolet radiation, and mechanical vibration. Traditional marine cables generally have the following drawbacks:

[0003] 1. Insufficient salt spray resistance: Ordinary insulation layers (such as ordinary PVC) are easily corroded by salt spray, resulting in a decrease in insulation performance and causing short circuit or leakage risks;

[0004] 2. Weak anti-aging ability: Long-term exposure to ultraviolet rays or humid and hot environments can cause the outer sheath of the cable to age and crack, shortening its service life;

[0005] 3. Poor shielding effect: The electromagnetic interference in the marine environment is strong (such as motors and radar equipment). The shielding layer of traditional cables (such as single-layer copper mesh) is easily loosened due to vibration and cannot effectively isolate electromagnetic interference.

[0006] 4. Insufficient mechanical protection: The narrow space on ships makes cables susceptible to compression and friction. Ordinary sheath materials (such as ordinary rubber) have low tear resistance and are easily damaged.

[0007] Therefore, there is an urgent need for a marine cable with optimized structure and strong comprehensive performance to meet the reliable operation requirements in the complex environment of ships. Utility Model Content

[0008] To overcome the shortcomings of existing technologies, a salt spray resistant and anti-aging marine shielded cable is provided. Through a multi-layer composite structure design, the cable's insulation, corrosion resistance, anti-aging properties, and mechanical protection capabilities are improved in salt spray, humid, and strong vibration environments. At the same time, the electromagnetic shielding effect is enhanced, ensuring the stable operation of the ship's electrical system.

[0009] To achieve the above objectives, this utility model provides a salt spray resistant and anti-aging marine shielded cable, comprising a cable core, wherein the cable core is formed by twisting multiple cables together, with a twisting pitch ratio ≤15; halogen-free high flame retardant rope is filled in the gaps of the cable core; a graphene composite thermoplastic semi-conductive shielding layer is wrapped around the cable core; a fluororubber inner anti-salt spray layer is provided outside the graphene composite thermoplastic semi-conductive shielding layer; a nano-insulating water-blocking tape is wrapped around the fluororubber inner anti-salt spray layer; a galvanized steel wire braided armor layer is woven outside the nano-insulating water-blocking tape; an outer anti-salt spray coating is provided outside the galvanized steel wire braided armor layer; a high-temperature resistant aluminum silicate fiber tape is placed outside the outer anti-salt spray coating; and a polytetrafluoroethylene propylene outer sheath is extruded outside the high-temperature resistant aluminum silicate fiber tape.

[0010] Preferably, the cable consists of multiple insulated cores and a first PBO fiber braided layer woven around the multiple insulated cores and coated with rubber adhesive on its outer surface.

[0011] Preferably, the insulated core consists of a conductor and a polyurethane insulation layer extruded over the conductor.

[0012] Preferably, the conductor has a PBO fiber reinforcing rope at its center.

[0013] Preferably, the conductor is a tin-plated copper conductor with a tin plating thickness of ≥0.05mm.

[0014] Preferably, the nano-insulating water-blocking tape comprises glass fiber nonwoven fabric, and the outer surface of the glass fiber nonwoven fabric is coated with nano-grade silicone.

[0015] Preferably, the thickness of the graphene composite thermoplastic semiconductive shielding layer is 0.8mm-1.2mm.

[0016] Preferably, the external anti-salt spray coating is made of anti-salt spray polyolefin, and the thickness of the anti-salt spray coating is 0.3-0.5 mm.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The cable consists of multiple insulated cores and a first PBO fiber braided layer 4, which is woven around the multiple insulated cores and coated with rubber adhesive. The use of adhesive to fix the high-strength PBO fibers prevents the cable from shifting during long-term winding and unwinding, and also ensures that the high-strength PBO fibers are evenly stressed, increasing tensile strength. In addition, PBO fiber is known in the industry as the "world's super fiber". It is the variety with the highest mechanical properties and heat resistance among organic high-performance fibers. Its tensile strength and modulus are almost twice that of para-aramid, its heat resistance is 100°C higher than that of para-aramid, its limiting oxygen index (LOI) reaches 68, and it is a non-flammable fiber. Its density is 1.54-1.56 g / cm3, which is lighter than carbon fiber. The use of this material greatly improves the tensile strength, wear resistance, bending fatigue resistance and cable service life of the cable.

[0019] 2. The conductor is made of tin-plated copper with a tin plating thickness of ≥0.05mm, which gives the conductor oxidation resistance and salt spray resistance. The tin layer is chemically stable at room temperature and can isolate copper from oxygen, preventing the formation of black CuO. The standard electrode potential of tin (-0.14V) is higher than that of copper (+0.34V). In a salt spray environment (5% NaCl, 35℃), it can act as a sacrificial anode to protect the copper substrate. After 1000h salt spray test, the corrosion rate of tin-plated copper is ≤0.01mm / year (untin-plated copper ≥0.1mm / year).

[0020] 3. The graphene composite thermoplastic semiconductive shielding layer serves as the outer shielding layer, providing a uniform electric field distribution (electric field strength deviation ≤10%), preventing partial discharge (breakdown voltage ≥30kV / mm), extending cable life, and also exhibiting excellent corrosion resistance.

[0021] 4. It has an inner fluororubber anti-salt spray layer and an outer anti-salt spray coating, forming a double anti-salt spray effect. This improves the lubricity of the cable surface, making it difficult for moisture and crystalline salt to adhere to the inner layer of the cable. It can prevent acid and alkali corrosion and prevent salt spray adhesion, thus improving the cable's anti-salt spray capability.

[0022] 5. The nano-insulating water-blocking tape consists of glass fiber nonwoven fabric with nano-grade silicone 82 sprayed on the outer surface. The glass fiber nonwoven fabric provides mechanical strength (tensile strength ≥100MPa), basic strength (tear strength ≥20kN / m), dimensional stability (heat shrinkage rate ≤2%), and high temperature resistance (long-term use temperature ≤400℃). The nano-silicone particles can fill the micropores of the glass fiber nonwoven fabric, forming a dual barrier of "physical barrier + chemical hydrophobicity", effectively preventing liquid water penetration and preventing chloride ion penetration in marine environments.

[0023] 6. The outermost layer is extruded with a polytetrafluoroethylene propylene outer sheath, which gives the cable excellent chemical resistance, high temperature resistance, aging resistance, tear resistance, low friction and excellent electrical insulation, further improving the service life of the cable.

[0024] In summary, this utility model, through its multi-layer composite structure design, significantly improves the resistance to salt spray corrosion, aging, shielding, and mechanical protection performance, making it suitable for the complex environments of ships with high salt spray, humidity, and strong vibration, and ensuring the stable operation of electrical systems. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the nano-insulating water-blocking tape of this utility model. Detailed Implementation

[0027] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0028] like Figure 1As shown, this utility model provides a salt spray resistant and anti-aging marine shielded cable, including a cable. The cable consists of multiple insulated cores and a first PBO fiber braided layer 4 woven around the multiple insulated cores and coated with rubber adhesive on its outer surface. The use of adhesive to fix the high-strength PBO fibers can prevent the cable from shifting during long-term winding and unwinding, and can also ensure that the high-strength PBO fibers are evenly stressed, increasing tensile strength. In addition, PBO fiber is known in the industry as the "world's super fiber". It is the variety with the highest mechanical properties and heat resistance among organic high-performance fibers. Its tensile strength and modulus are almost twice that of para-aramid, its heat resistance is 100°C higher than that of para-aramid, its limiting oxygen index (LOI) reaches 68, and it is a non-flammable fiber. Its density is 1.54-1.56 g / cm3, which is lighter than carbon fiber. Using this material greatly improves the tensile strength, wear resistance, bending fatigue resistance and cable service life of the cable.

[0029] The insulated core consists of a conductor 2 and a polyurethane insulation layer 3 extruded outside the conductor; multiple cables are twisted together to form a cable core with a twisting pitch ratio ≤15.

[0030] In this embodiment, the conductor is a tin-plated copper conductor with a tin plating thickness of ≥0.05mm, which gives the conductor antioxidant and salt spray resistance. The tin layer is chemically stable at room temperature and can isolate copper from oxygen, preventing the formation of black CuO. The standard electrode potential of tin (-0.14V) is higher than that of copper (+0.34V), and it can act as a sacrificial anode to protect the copper substrate in a salt spray environment (5% NaCl, 35℃). After 1000h salt spray test, the corrosion rate of tin-plated copper is ≤0.01mm / year (untin-plated copper ≥0.1mm / year).

[0031] Filling the gaps in the cable core with halogen-free high flame-retardant rope 5 improves the cable's flame-retardant performance. A 0.8mm-1.2mm thick graphene composite thermoplastic semi-conductive shielding layer 6 is wrapped around the cable core as an outer shielding layer, providing uniform electric field distribution (electric field strength deviation ≤10%), preventing partial discharge (breakdown voltage ≥30kV / mm), extending cable life, and also exhibiting excellent corrosion resistance. The graphene composite thermoplastic semi-conductive shielding layer 6 is surrounded by a fluororubber inner anti-salt spray layer 7, which has high salt spray resistance, chemical corrosion resistance, and aging resistance, maintaining stable performance in complex chemical environments. A nano-insulating water-blocking tape 8 is wrapped around the fluororubber inner anti-salt spray layer to improve the cable's water-blocking performance. A galvanized steel wire braided armor layer 9 is woven around the nano-insulating water-blocking tape, reducing cable weight while significantly increasing tensile strength. The cable features an outer anti-salt spray coating 10 made of anti-salt spray polyolefin, with a thickness of 0.3-0.5 mm. This coating, together with the inner anti-salt spray layer of fluororubber, forms a double anti-salt spray effect, improving the lubricity of the cable surface and making it difficult for moisture and crystalline salt to adhere to the inner layer of the cable. This prevents both acid and alkali corrosion and salt spray adhesion, thus enhancing the cable's anti-salt spray capability. Outside the outer anti-salt spray coating is a high-temperature resistant aluminum silicate fiber tape 11, with a long-term operating temperature between 800℃ and 1200℃, and a short-term operating temperature exceeding 1400℃, effectively slowing the spread of fire. Finally, a polytetrafluoroethylene propylene outer sheath 12 is extruded over the high-temperature resistant aluminum silicate fiber tape, giving the cable excellent chemical resistance, high-temperature resistance, aging resistance, tear resistance, low friction, and excellent electrical insulation, further extending the cable's service life.

[0032] In this embodiment, as Figure 2 As shown, the nano-insulating water-blocking tape 8 includes a glass fiber nonwoven fabric 81, the outer surface of which is coated with nano-grade silicone 82. The glass fiber nonwoven fabric provides mechanical strength (tensile strength ≥100MPa), basic strength (tear strength ≥20kN / m), dimensional stability (heat shrinkage rate ≤2%), and high temperature resistance (long-term use temperature ≤400℃). The nano-silicone particles can fill the micropores of the glass fiber nonwoven fabric, forming a dual barrier of "physical barrier + chemical hydrophobicity", effectively preventing liquid water penetration and preventing chloride ion penetration in the marine environment.

[0033] The production of nano-insulating water-blocking tape requires strict control over substrate pretreatment, coating formulation, and curing process. The core process is as follows:

[0034] 1. Substrate Pretreatment

[0035] Surface cleaning: The glass fiber nonwoven fabric is plasma cleaned (power 50W, time 2min) to remove surface oil and release agent, and improve coating adhesion (peel strength ≥5N / cm).

[0036] Surface activation: Coating with a silane coupling agent (such as γ-aminopropyltriethoxysilane, concentration 1%) forms a "SiO2-coupling agent-silicone" interface transition layer on the glass fiber surface, enhancing the coating adhesion.

[0037] 2. Preparation of Nano-Silicone Coating

[0038] Formulation design: Use silicone resin (such as polydimethylsiloxane, PDMS) as film-forming agent (accounting for 60%-70%), nano SiO2 particles (particle size 100nm, accounting for 20%-30%), add coupling agent (2%-5%) and curing agent (1%-3%), stir until uniformly dispersed (particle size distribution ≤20nm).

[0039] Spraying process: Electrostatic spraying (voltage 60kV, air pressure 0.3MPa) is adopted, and the coating thickness is controlled at 5-20μm (achieved by adjusting the speed of the spray gun) to ensure that the coating is uniform and without any missed areas.

[0040] 3. Curing and molding

[0041] Thermosetting: Curing at 150℃ for 10 minutes causes the silicone resin to cross-link into a network structure, improving the coating's hardness and temperature resistance;

[0042] Post-treatment: After cooling to room temperature, the coating is compacted by a pressure roller (pressure 0.5MPa) to eliminate internal stress and prevent warping.

[0043] To ensure product quality, the following key tests must be performed on the nano-insulating water-blocking tape:

[0044] Test Project Test methods Technical Specifications (for reference) Water-blocking performance Hydrostatic pressure test (GB / T 4208) ≥500kPa (no permeation after 30min) Insulation performance Breakdown voltage test (GB / T 1408) ≥30kV / mm (normal temperature) Adhesion 180° peel test (GB / T 3903) ≥5N / cm (glass fiber substrate) Salt spray resistance Salt spray test (GB / T 10125) ≥1000h (no rust, no coating peeling) Temperature resistance Thermogravimetric analysis (TGA) Mass retention rate ≥90% after 400℃×2h

[0045] The above data demonstrates that the nano-insulating water-blocking tape, through the synergistic design of glass fiber nonwoven fabric and nano-grade silicone, significantly outperforms traditional materials in terms of insulation, water blocking, and weather resistance. With its composite properties of "insulation + water blocking + weather resistance," it is suitable for complex environments such as high salt spray and humidity in marine cables.

[0046] In summary, this cable, through its multi-layer composite structure design, significantly improves its resistance to salt spray corrosion, aging resistance, shielding, and mechanical protection, making it suitable for the complex environments of ships with high salt spray, humidity, and strong vibration, and ensuring the stable operation of electrical systems.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present utility model, and these should also be considered to fall within the protection scope of the present utility model.

Claims

1. A salt spray resistant and aging-resistant marine shielded cable, characterized in that, The cable core is composed of multiple strands of wire twisted together, with a twisting pitch ratio ≤15. The gaps in the cable core are filled with halogen-free, high-flame-retardant rope. A graphene composite thermoplastic semi-conductive shielding layer is wrapped around the cable core. A fluororubber inner anti-salt spray layer is provided outside the graphene composite thermoplastic semi-conductive shielding layer. A nano-insulating water-blocking tape is wrapped around the fluororubber inner anti-salt spray layer. A galvanized steel wire braided armor layer is woven around the nano-insulating water-blocking tape. An outer anti-salt spray coating is provided outside the galvanized steel wire braided armor layer. A high-temperature resistant aluminum silicate fiber tape is placed outside the outer anti-salt spray coating. A polytetrafluoroethylene propylene outer sheath is extruded outside the high-temperature resistant aluminum silicate fiber tape.

2. A salt-fog and ageing resistant marine screened cable according to claim 1, characterised in that: The cable consists of multiple insulated cores and a first PBO fiber braided layer that is woven around the multiple insulated cores and has a rubber adhesive coating on its outer surface.

3. A salt-fog and ageing resistant marine screened cable according to claim 2, characterised in that: The insulated wire core consists of a conductor and a polyurethane insulation layer extruded over the conductor.

4. A salt-fog and ageing resistant marine screened cable according to claim 3, characterised in that: The conductor is reinforced with PBO fiber rope at its center.

5. The salt spray resistant and aging-resistant marine shielded cable according to claim 3, characterized in that: The conductor is a tin-plated copper conductor with a tin plating thickness of ≥0.05mm.

6. A salt-fog and ageing resistant marine sheathed cable according to claim 1, characterized in that: The nano-insulating water-blocking tape comprises glass fiber nonwoven fabric, the outer surface of which is coated with nano-grade silicone.

7. A salt-fog and ageing resistant marine sheathed cable as claimed in claim 1, wherein: The thickness of the graphene composite thermoplastic semiconductive shielding layer is 0.8mm-1.2mm.

8. A salt-fog and ageing resistant marine sheathed cable according to claim 1, characterized in that: The external anti-salt spray coating is made of anti-salt spray polyolefin, and the thickness of the anti-salt spray coating is 0.3-0.5mm.

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