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

Abstract

The invention relates to the technical field of power cables, and particularly discloses a high-strength corrosion-resistant power cable and a preparation method thereof, the high-strength corrosion-resistant power cable comprises a central tube made of ceramic silicone rubber, and the high-strength corrosion-resistant power cable also comprises a sheath layer. In a normal working state, the conductors are in a dispersed state, the overall temperature of the cable during working is greatly reduced through the dispersed conductors, and in combination with the working environment of the cable, the low-temperature state of the cable during working is further ensured through mutual cooperation of water flow and the dispersed conductors, so that the service life of the cable is greatly prolonged; the problem that water enters the interior of the cable due to expansion and fracture of the sheath layer due to uneven heat and cold caused by the fact that the cable is in a high-temperature working environment for a long time is avoided, meanwhile, when the cable works, the injection cavity is filled with insulating oil, the flowing cavity in the sheath layer is also filled with the insulating oil through the communicating pipe, and the insulating oil can fill gaps in the cable to form a liquid insulating layer; the insulation performance of the cable is improved, and moisture and corrosive substances are prevented from invading.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and more specifically, to a high-strength corrosion-resistant power cable and a preparation method thereof. Background Art

[0002] In the field of power transmission, high-strength corrosion-resistant power cables are key facilities to ensure stable power supply. Through special structural designs and material selections, such cables are designed to withstand the tests of complex environments, ensuring the reliability and safety of power transmission. Their applications are extensive, covering multiple fields such as urban power grids, industrial facilities, and ocean engineering. Especially in harsh environments, such as scenes with high humidity, strong corrosion, and high mechanical stress, the performance of high-strength corrosion-resistant power cables is directly related to the stable operation of the entire power system, playing a crucial supporting role in economic development and social life.

[0003] However, traditional power cables have many problems in actual underwater use. In terms of heat dissipation, the conductor structure design of traditional cables is unreasonable, making it difficult to effectively disperse the heat generated during operation, resulting in an excessively high overall temperature of the cable. Being in a high-temperature environment for a long time will not only accelerate the aging of the internal materials of the cable but also easily cause the sheath layer to expand and rupture due to uneven heating and cooling, leading to internal water ingress and triggering faults such as short circuits, seriously shortening the service life of the cable. In terms of insulation performance, traditional cables have more internal voids and lack effective insulation filling measures, being unable to effectively resist the intrusion of moisture and corrosive substances, resulting in a decline in insulation performance and a risk of electric leakage. In terms of mechanical strength, the conductor and sheath materials of traditional cables have insufficient strength and are difficult to withstand large external forces. When subjected to extrusion, stretching, or bending, the structure is easily damaged, affecting power transmission. Moreover, the preparation process of traditional cables is relatively simple, and the adhesion between the layers of materials is poor, being prone to delamination during long-term use, reducing the comprehensive performance of the cable. In addition, traditional cables usually do not have a self-healing function. Once the surface is damaged, it is difficult to repair itself, requiring frequent replacement, increasing the maintenance cost and power outage time, and being difficult to meet the requirements of modern power systems for high cable reliability and low maintenance costs. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] The present invention provides a high-strength corrosion-resistant power cable and a preparation method thereof, solving the problems mentioned in the above background art.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A high-strength and corrosion-resistant power cable, including a central tube made of ceramic silicone rubber, further including: a sheath layer, the outer surface of the sheath layer is fixedly inlaid and connected to the outer surface of the central tube, and five sheath layers are fixedly spaced apart around the central axis of the central tube; a shielding layer, the shielding layer is arranged inside the sheath layer, and the shielding layer and the sheath layer are arranged on the same central axis; an insulating layer, the outer surface of the insulating layer is fixedly sleeved on the inner surface of the shielding layer; a conductor, the conductor is fixedly sleeved on the inner surface of the insulating layer.

[0008] According to an embodiment of the present invention, a flow cavity is arranged between the sheath layer and the shielding layer, an injection cavity is penetrated and opened inside the central tube, a communication pipe is fixedly connected through the inner surface of the injection cavity, and the outer end of the communication pipe penetrates the sheath layer and communicates with the flow cavity, and insulating oil is filled in the injection cavity and the flow cavity.

[0009] According to an embodiment of the present invention, the inner end of the communication pipe is fixedly connected to a stabilizing pipe, and the outer surface of the stabilizing pipe is fixedly connected to the inner surface of the injection cavity.

[0010] According to an embodiment of the present invention, a positioning strip is fixedly connected to the inner surface of the sheath layer, five positioning strips are fixedly spaced apart on the inner surface of the same sheath layer, and through holes are penetrated on the side surface of the positioning strip.

[0011] According to an embodiment of the present invention, an extrusion cavity is penetrated and opened in the wall of the central tube, five extrusion cavities are fixedly spaced apart around the central axis of the central tube, and support tubes are symmetrically and fixedly connected to the outer surfaces on both sides of the sheath layer.

[0012] According to an embodiment of the present invention, five support tubes are set as a group, the support tubes in the same group are combined into a nearly circular ring, adjacent sheath layers are fixedly connected through the support tubes, an elastic metal mesh is attached to the inner wall of the support tube, and the inner cavity of the support tube communicates with the extrusion cavity.

[0013] The present invention provides a preparation method for a high-strength and corrosion-resistant power cable, including the following steps:

[0014] S1. Conductor:

[0015] Material selection: Using a three-dimensional network carbon phase reinforced copper-based composite material as the conductor material;

[0016] Ratio: Short carbon fiber: Carbon fibers with lengths of 15 mm, 6.5 mm, and 5.5 mm are composed according to a mass ratio of 0.4 times b, b, and 0.6 times b, where b is the mass of the carbon fiber with the middle length;

[0017] Carbon nanotubes: The mass is 13.5% of the mass of short carbon fibers;

[0018] Copper matrix: The mass ratio of copper, nickel, and chromium is 102:2.2:1.2;

[0019] Preparation method: Adopt the vacuum infiltration hot pressing forming process. Sinter the short carbon fiber and carbon nanotube preform with copper alloy powder or copper powder in a graphite mold, heat to the melting of copper alloy or copper, and keep warm for 30 minutes. Introduce a protective gas, pressurize, keep warm, and perform pressure infiltration, and obtain the composite material after cooling;

[0020] S2. Insulating layer

[0021] Material selection: Use ethylene-tetrafluoroethylene copolymer modified with nano-silica as the insulating layer material and add graphene;

[0022] Ratio: Nano-silica is mixed with ethylene-tetrafluoroethylene copolymer in a mass ratio of 1:100, and then 10% of graphene is added;

[0023] Preparation method: Through the co-blending extrusion process, uniformly mix nano-silica, graphene with ethylene-tetrafluoroethylene copolymer, and form a uniform insulating layer on the surface of the conductor through the extrusion coating process;

[0024] S3. Shielding layer

[0025] Material selection: Adopt a multi-layer composite shielding structure, including aluminum foil and carbon fiber, and add a layer of conductive polymer between the aluminum foil and carbon fiber;

[0026] Ratio: The thickness of the aluminum foil is 0.2 mm, the thickness of the carbon fiber is 0.1 mm, the thickness of the conductive polymer is 0.05 mm, and the mass ratio of the aluminum foil to the carbon fiber is 1:1;

[0027] Preparation method: Wind the aluminum foil, conductive polymer, and carbon fiber around the insulating layer in sequence to form a multi-layer composite shielding structure;

[0028] S4. Sheath layer

[0029] Material selection: The sheath layer adopts a blend of polyether ether ketone and polytetrafluoroethylene, and adds nano-aluminum oxide and nano-ceramic particles;

[0030] Ratio: Polyether ether ketone and polytetrafluoroethylene are mixed in a mass ratio of 7:3, and then 10% of nano-aluminum oxide and 5% of nano-ceramic particles are added;

[0031] Preparation method: Through the extrusion process, uniformly mix the blend of polyether ether ketone and polytetrafluoroethylene with nano-aluminum oxide and nano-ceramic particles to form the sheath layer;

[0032] S5. Self-healing anti-corrosion coating

[0033] Material selection: The coating contains microcapsules;

[0034] Ratio: The self-healing anti-corrosion coating is composed of a matrix material, an auxiliary material, and microcapsules, where the mass of the microcapsules accounts for 20% of the total mass of the coating.

[0035] According to an embodiment of the present invention, during the extrusion process of the shielding layer, the surface of the conductor and the insulating layer is treated by plasma treatment technology.

[0036] According to an embodiment of the present invention, the specific manufacturing method of the self-healing anti-corrosion coating is as follows:

[0037] Raw materials:

[0038] (1) Microcapsules:

[0039] Core material: A light-responsive self-healing agent, accounting for 10% of the total mass;

[0040] Wall material: A blend of polymethyl methacrylate and polyetheramine, accounting for 10% of the total mass;

[0041] (2) Matrix material:

[0042] Epoxy resin: As the matrix material, accounting for 50% of the total mass;

[0043] Bionic material: Polyaniline, accounting for 20% of the total mass;

[0044] (3) Auxiliary materials:

[0045] Toughening agent: Polyamide resin, accounting for 5% of the total mass;

[0046] Leveling agent: Polyether-modified polysiloxane, accounting for 2.5% of the total mass;

[0047] Anti-settling agent: Fumed silica, accounting for 2.5% of the total mass;

[0048] (4) Manufacturing method

[0049] Preparation of microcapsules:

[0050] Using the light-responsive self-healing agent as the core, microcapsules are formed by encapsulation with an emulsifier and a curing agent, and a blend of polymethyl methacrylate and polyetheramine is used as the wall material;

[0051] Preparation of the composite membrane:

[0052] Selection of the porous support: Select a polyacrylonitrile ultrafiltration membrane as the porous support;

[0053] Preparation of the aqueous phase: Dissolve polyetheramine in deionized water to prepare an aqueous solution with a concentration of 0.0225 mol / L;

[0054] Preparation of organic phase: Dissolve trimesoyl chloride in n - hexane to prepare an organic phase solution with a concentration of 0.0075 mol / L.

[0055] Reaction process:

[0056] Cut the porous support into an appropriate size, immerse it in the aqueous phase solution, and air - dry for thirty minutes.

[0057] Immerse the air - dried support in the organic phase solution for ten minutes to allow the polymerization reaction of the two monomers at the interface to form a dense polymer skin.

[0058] After the reaction is completed, take out the support, wash it with deionized water and organic solvent respectively to remove unreacted monomers and by - products, form a composite membrane, and perform heat treatment on the generated composite membrane.

[0059] Mixing with coating:

[0060] Cut the prepared composite membrane into an appropriate size. Then mix epoxy resin and polyaniline, stir evenly, add microcapsules, composite membrane, toughening agent, leveling agent and anti - settling agent, and continue to stir until uniform to form a self - healing anti - corrosion coating.

[0061] Coating process:

[0062] Uniformly coat the self - healing anti - corrosion coating containing the composite membrane on the surface of the sheath layer. During the coating process, ensure that the composite membrane is fully combined with the coating to form a uniform coating.

[0063] Curing process:

[0064] Cure the coating by natural drying. During the curing process, the composite membrane and other components in the coating act together to form a complete self - healing anti - corrosion coating.

[0065] (III) Beneficial effects

[0066] The present invention provides a high - strength and corrosion - resistant power cable and its preparation method. It has the following beneficial effects:

[0067] (1). This high-strength corrosion-resistant power cable and its preparation method. Under normal working conditions, the conductor is in a dispersed state. By means of the dispersed conductor, the overall temperature of the cable during operation is significantly reduced. In combination with the working environment of the cable, water flow and the dispersed conductor cooperate with each other to further ensure that the cable operates at a low temperature, thereby greatly increasing the service life of the cable and avoiding the problem that the sheath layer expands and cracks due to uneven heating and cooling in a high-temperature working environment for a long time, resulting in internal water ingress. At the same time, when the cable is working, the injection cavity is filled with insulating oil, and through the connecting pipe, the flow cavity in the sheath layer is also filled with insulating oil. The insulating oil can fill the voids inside the cable to form a liquid insulation layer, improving the insulation performance of the cable, preventing the intrusion of moisture and corrosive substances, and at the same time providing a certain lubricating effect, reducing friction and wear inside the cable. When the working depth of the cable in water is greater, the water pressure effect on the cable is stronger, that is, the extrusion cavity receives a greater extrusion force, so that the thin wall on the outer side of the central tube extrusion cavity is squeezed and contracted, and then the internal air pressure is transported to the internal cavity of the support tube. After the thin wall of the central tube is squeezed and contracted by the water pressure, it will sink inward, and then firmly pull the sheath layer to fit on the outer surface of the central tube, thereby greatly improving the overall working stability of the cable and avoiding the disconnection of the sheath layer from the central tube when the water pressure is relatively high. After the air pressure in the internal cavity of the support tube increases, it will push the sheath layer to both sides, thus cooperating with the extrusion cavity to further make the sheath layer firmly fit on the outer surface of the central tube, further improving the working stability of the cable, and at the same time providing pressure support on both sides of the sheath layer to avoid bending of the sheath layer, thereby greatly improving the protection effect on the internal conductor.

[0068] (2). The high-strength corrosion-resistant power cable and its preparation method adopt a three-dimensional network carbon phase-reinforced copper-based composite material as the conductor, which is different from the pure copper or ordinary copper alloy used as the conductor in the prior art. Combining the reinforcing effects of short carbon fibers and carbon nanotubes, while maintaining good electrical conductivity, it significantly improves the mechanical strength and corrosion resistance of the cable. The sheath layer uses a blend of polyether ether ketone and polytetrafluoroethylene, and adds nano-fillers such as nano-aluminum oxide and nano-ceramic particles, further enhancing the corrosion resistance and mechanical strength of the cable. The insulating layer uses an ethylene-tetrafluoroethylene copolymer modified with nano-silica and adds graphene, improving the insulation performance, thermal conductivity and corrosion resistance. A self-healing anti-corrosion coating is applied on the surface of the sheath layer. This coating contains micro-capsules that can actively repair surface damage and extend the service life of the cable. The shielding layer adopts a multi-layer composite structure, including aluminum foil, conductive polymer and carbon fiber, improving the shielding effect and corrosion resistance. At the same time, the sheath layer in the prior art usually does not have the self-healing function, while this process applies a self-healing anti-corrosion coating on the surface of the sheath layer, which can actively repair surface damage, extend the service life of the cable and reduce the maintenance cost. And the preparation process in the prior art usually lacks precise control of surface treatment and temperature and pressure, while this process adopts plasma treatment technology and strictly controls the temperature and pressure during the extrusion process, improving the adhesion and corrosion resistance between the layers of materials and ensuring the overall performance of the cable.

[0069] (3). The high-strength corrosion-resistant power cable and its preparation method adopt an interfacial polymerization method to prepare a self-healing anti-corrosion coating. The coating contains micro-capsules with good wall material density, which can effectively prevent water molecules from invading. By adding a composite film as the outer protective film, it can prevent corrosive media such as seawater from directly contacting the cable, effectively resist the erosion of seawater and extend the service life of the cable. When there are small scratches or damages on the surface of the sheath layer due to external forces or long-term use, the micro-capsules in the composite film rupture, releasing a photo-responsive self-healing agent, which synergistically acts with the biomimetic material in the matrix material to form a protective film and achieve the self-healing function, ensuring the long-term stable operation of the cable in the seabed environment. At the same time, the composite film has a certain mechanical strength, which can resist the physical impact and friction that the submarine cable may encounter during laying and use, and protect the internal structure of the cable from damage. Brief Description of the Drawings

[0070] Figure 1 is the overall structural schematic diagram of the present invention;

[0071] Figure 2 is the structural schematic diagram of the central tube of the present invention;

[0072] Figure 3 is the structural schematic diagram of the support tube of the present invention;

[0073] Figure 4 is the structural schematic diagram of the extrusion cavity of the present invention;

[0074] Figure 5 It is a schematic structural diagram of the positioning strip of the present invention.

[0075] In the figure: 1, central tube; 2, sheath layer; 3, shielding layer; 4, insulating layer; 5, conductor; 6, flow cavity; 7, injection cavity; 8, connecting pipe; 9, stabilizing tube; 10, positioning strip; 11, through hole; 12, extrusion cavity; 13, support tube; 14, elastic metal mesh. Specific embodiments

[0076] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0077] As Figures 1 to 5 shown, the present invention provides a technical solution: a high-strength and corrosion-resistant power cable, including a central tube 1 made of ceramic silicone rubber, and further including:

[0078] Sheath layer 2, the outer surface of the sheath layer 2 is fixedly inlaid and connected to the outer surface of the central tube 1, and five sheath layers 2 are fixedly arranged at equal intervals around the central axis of the central tube 1;

[0079] Shielding layer 3, the shielding layer 3 is arranged inside the sheath layer 2, and the shielding layer 3 and the sheath layer 2 are arranged on the same central axis;

[0080] Insulating layer 4, the outer surface of the insulating layer 4 is fixedly sleeved on the inner surface of the shielding layer 3;

[0081] Conductor 5, the conductor 5 is fixedly sleeved on the inner surface of the insulating layer 4.

[0082] A flow cavity 6 is arranged between the sheath layer 2 and the shielding layer 3. An injection cavity 7 is penetrated and opened inside the central tube 1. A connecting pipe 8 is fixedly connected through the inner surface of the injection cavity 7. The outer end of the connecting pipe 8 penetrates the sheath layer 2 and communicates with the flow cavity 6. Insulating oil is filled in the injection cavity 7 and the flow cavity 6.

[0083] The inner end of the connecting pipe 8 is fixedly connected to a stabilizing tube 9, and the outer surface of the stabilizing tube 9 is fixedly connected to the inner surface of the injection cavity 7.

[0084] The inner surface of the sheath layer 2 is fixedly connected with a positioning strip 10. Five positioning strips 10 are fixedly arranged at equal intervals on the inner surface of the same sheath layer 2, and through holes 11 are penetrated through the side surface of the positioning strip 10.

[0085] The wall of the central tube 1 is penetrated with an extrusion cavity 12. Five extrusion cavities 12 are arranged at a fixed interval around the central axis of the central tube 1. Symmetrically and fixedly connected to the outer surfaces on both sides of the sheath layer 2 are support tubes 13.

[0086] Five support tubes 13 are set as a group. The support tubes 13 in the same group are combined into a nearly circular ring shape. Adjacent sheath layers 2 are fixedly connected through the support tubes 13. An elastic metal mesh 14 is fitted on the inner wall of the support tube 13. The inner cavity of the support tube 13 is communicated with the extrusion cavity 12.

[0087] A preparation method of a high-strength and corrosion-resistant power cable includes the following steps:

[0088] S1. Conductor 5:

[0089] Material selection: A three-dimensional network carbon phase reinforced copper-based composite material is used as the material of the conductor 5;

[0090] Ratio: Short carbon fibers: Carbon fibers with lengths of 15 mm, 6.5 mm, and 5.5 mm are composed according to a mass ratio of 0.4 times b, b, and 0.6 times b, where b is the mass of the carbon fiber with the middle length;

[0091] Carbon nanotubes: The mass is 13.5% of the mass of the short carbon fibers;

[0092] Copper matrix: The mass ratio of copper, nickel, and chromium is 102:2.2:1.2;

[0093] Preparation method: Adopt a vacuum infiltration hot pressing forming process. Sinter the preform of short carbon fibers and carbon nanotubes with copper alloy powder or copper powder in a graphite mold, heat to melt the copper alloy or copper, and keep warm for 30 minutes. Introduce a protective gas, pressurize, keep warm and pressure-infiltrate, and obtain the composite material after cooling;

[0094] S2. Insulation layer 4

[0095] Material selection: Use a nano-silica modified ethylene-tetrafluoroethylene copolymer as the material of the insulation layer 4 and add graphene;

[0096] Ratio: Nano-silica is mixed with a mass ratio of 1:100, and then 10% of graphene is added;

[0097] Preparation method: Through a co-blending extrusion process, uniformly mix nano-silica, graphene, and ethylene-tetrafluoroethylene copolymer, and form a uniform insulation layer 4 on the surface of the conductor 5 through an extrusion coating process;

[0098] S3. Shielding layer 3

[0099] Material selection: Adopt a multi-layer composite shielding structure, including aluminum foil and carbon fiber, and add a layer of conductive polymer between the aluminum foil and the carbon fiber;

[0100] Ratio: The thickness of the aluminum foil is 0.2 mm, the thickness of the carbon fiber is 0.1 mm, the thickness of the conductive polymer is 0.05 mm, and the mass ratio of the aluminum foil to the carbon fiber is 1:1;

[0101] Preparation method: The aluminum foil, the conductive polymer and the carbon fiber are sequentially wrapped around the insulating layer 4 to form a multi-layer composite shielding structure;

[0102] S4. Sheath layer 2

[0103] Material selection: The sheath layer 2 is made of a blend of polyetheretherketone and polytetrafluoroethylene, and nano-aluminum oxide and nano-ceramic particles are added;

[0104] Ratio: Polyetheretherketone and tetrafluoroethylene are mixed in a mass ratio of 7:3, and then 10% of nano-aluminum oxide and 5% of nano-ceramic particles are added;

[0105] Preparation method: Through an extrusion process, the blend of polyetheretherketone and tetrafluoroethylene and nano-aluminum oxide and nano-ceramic particles are uniformly mixed to form the sheath layer 2;

[0106] S5. Self-healing anti-corrosion coating

[0107] Material selection: The coating contains microcapsules;

[0108] Ratio: The self-healing anti-corrosion coating is composed of a matrix material, an auxiliary material and microcapsules, and the mass of the microcapsules accounts for 20% of the total mass of the coating.

[0109] During the extrusion process of the shielding layer 3, the conductor 5 and the insulating layer 4 are surface-treated by plasma treatment technology.

[0110] The specific production method of the self-healing anti-corrosion coating is as follows:

[0111] Raw materials:

[0112] (1) Microcapsules:

[0113] Core material: Photo-responsive self-healing agent, accounting for 10% of the total mass;

[0114] Wall material: A blend of polymethyl methacrylate and polyetheramine, accounting for 10% of the total mass;

[0115] (2) Matrix material:

[0116] Epoxy resin: As the matrix material, accounting for 50% of the total mass;

[0117] Bionic material: Polyaniline, accounting for 20% of the total mass;

[0118] (3) Auxiliary material:

[0119] Toughening agent: polyamide resin, accounting for 5% of the total mass;

[0120] Leveling agent: polyether-modified polysiloxane, accounting for 2.5% of the total mass;

[0121] Anti-settling agent: fumed silica, accounting for 2.5% of the total mass;

[0122] (4) Manufacturing method

[0123] Preparation of microcapsules:

[0124] Using the light-responsive self-healing agent as the core, microcapsules are formed by encapsulating with an emulsifier and a curing agent, and a blend of polymethyl methacrylate and polyetheramine is used as the wall material;

[0125] Preparation of the composite membrane:

[0126] Selection of the porous support: Select a polyacrylonitrile ultrafiltration membrane as the porous support;

[0127] Preparation of the aqueous phase: Dissolve polyetheramine in deionized water to prepare an aqueous phase solution with a concentration of 0.0225 mol / L;

[0128] Preparation of the organic phase: Dissolve trimesoyl chloride in n-hexane to prepare an organic phase solution with a concentration of 0.0075 mol / L;

[0129] Reaction process:

[0130] Cut the porous support into an appropriate size, immerse it in the aqueous phase solution, and air dry for thirty minutes;

[0131] Immerse the air-dried support in the organic phase solution for ten minutes to allow the two monomers to undergo a polymerization reaction at the interface to form a dense polymer skin;

[0132] After the reaction is completed, take out the support, wash it with deionized water and organic solvents respectively to remove unreacted monomers and by-products, form a composite membrane, and perform heat treatment on the resulting composite membrane;

[0133] Mix with the coating:

[0134] Cut the prepared composite membrane into an appropriate size, then mix epoxy resin and polyaniline, stir evenly and add microcapsules, composite membrane, toughening agent, leveling agent and anti-settling agent, and continue to stir until uniform to form a self-healing anti-corrosion coating;

[0135] Coating process:

[0136] Uniformly coat the self-healing anti-corrosion coating containing the composite membrane on the surface of the sheath layer 2. During the coating process, ensure that the composite membrane is fully combined with the coating to form a uniform coating;

[0137] Curing process:

[0138] The coating is cured by natural drying. During the curing process, the composite film and other components in the coating act together to form a complete self-healing anti-corrosion coating.

[0139] When in use, after the cable is connected, it can be put into water. Under normal working conditions, the conductor 5 is in a dispersed state. By the dispersed conductor 5, the overall temperature of the cable during operation is significantly reduced. In combination with the working environment of the cable, the water flow and the dispersed conductor 5 cooperate with each other to further ensure that the cable is in a low-temperature state during operation, thereby significantly increasing the service life of the cable and avoiding the problem that the sheath layer 2 expands and cracks due to uneven heating and cooling in a high-temperature working environment for a long time, resulting in water ingress inside. At the same time, when the cable is working, the injection cavity 7 is filled with insulating oil, and through the connecting pipe 8, the flow cavity 6 inside the sheath layer 2 is also filled with insulating oil. The insulating oil can fill the voids inside the cable to form a liquid insulation layer 4, improving the insulation performance of the cable, preventing the intrusion of moisture and corrosive substances, and at the same time providing a certain lubricating effect, reducing the friction and wear inside the cable. When the working depth of the cable in water is greater, the water pressure effect on the cable is stronger, which makes the extrusion cavity 12 receive a greater extrusion force, so that the thin wall on the outer side of the extrusion cavity 12 of the central tube 1 is extruded and contracted, and then the internal air pressure is transported to the internal cavity of the support tube 13. After the thin wall of the central tube 1 is extruded and contracted by the water pressure, it will sink inward, and then firmly pull the sheath layer 2 to fit on the outer surface of the central tube 1, thereby significantly improving the overall working stability of the cable and avoiding the disconnection of the sheath layer 2 from the central tube 1 when the water pressure is high. After the air pressure in the internal cavity of the support tube 13 increases, it will push the sheath layer 2 to both sides, so as to cooperate with the extrusion cavity 12, further making the sheath layer 2 firmly fit on the outer surface of the central tube 1, further improving the working stability of the cable, and at the same time providing pressure support on both sides of the sheath layer 2 to avoid bending of the sheath layer 2, thereby significantly improving the protection effect on the internal conductor 5.

[0140] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0141] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength corrosion-resistant power cable, comprising a central tube (1), characterized in that: The central tube (1) is made of ceramic silicone rubber and further includes: A sheath layer (2), the outer surface of the sheath layer (2) is fixedly inlaid and connected to the outer surface of the central tube (1), and five sheath layers (2) are fixedly arranged at equal intervals around the central axis of the central tube (1); A shielding layer (3), the shielding layer (3) is arranged inside the sheath layer (2), and the shielding layer (3) and the sheath layer (2) are arranged on the same central axis; An insulating layer (4), the outer surface of the insulating layer (4) is fixedly sleeved on the inner surface of the shielding layer (3); A conductor (5), the conductor (5) is fixedly sleeved on the inner surface of the insulating layer (4).

2. The high-strength and corrosion-resistant power cable according to claim 1, wherein: A flow cavity (6) is arranged between the sheath layer (2) and the shielding layer (3), an injection cavity (7) is penetrated and opened inside the central tube (1), a communication pipe (8) is fixedly communicated through the inner surface of the injection cavity (7), the outer end of the communication pipe (8) penetrates through the sheath layer (2) and is communicated with the flow cavity (6), and insulating oil is filled in the injection cavity (7) and the flow cavity (6).

3. The high-strength and corrosion-resistant power cable according to claim 2, characterized in that: The inner end of the communication pipe (8) is fixedly communicated with a stabilizing pipe (9), and the outer surface of the stabilizing pipe (9) is fixedly connected to the inner surface of the injection cavity (7).

4. The high-strength and corrosion-resistant power cable according to claim 3, wherein: The inner surface of the sheath layer (2) is fixedly connected with positioning strips (10), five positioning strips (10) are fixedly arranged at equal intervals on the inner surface of the same sheath layer (2), and through holes (11) are penetrated and opened on the side surfaces of the positioning strips (10).

5. A high-strength and corrosion-resistant power cable according to claim 4, characterized in that: An extrusion cavity (12) is penetrated and opened in the wall of the central tube (1), five extrusion cavities (12) are fixedly arranged at equal intervals around the central axis of the central tube (1), and support tubes (13) are symmetrically and fixedly connected to the outer surfaces on both sides of the sheath layer (2).

6. The high-strength and corrosion-resistant power cable according to claim 5, characterized in that: Five support tubes (13) are set as a group, the same group of support tubes (13) are combined into a nearly circular ring, adjacent sheath layers (2) are fixedly connected through the support tubes (13), an elastic metal mesh (14) is attached to the inner wall of the support tube (13), and the inner cavity of the support tube (13) is communicated with the extrusion cavity (12).

7. A method for preparing a high-strength corrosion-resistant power cable, including the high-strength corrosion-resistant power cable described in claim 1, characterized in that: Including the following steps: S1. Conductor (5): Material selection: A three-dimensional network carbon phase reinforced copper-based composite material is used as the material of the conductor (5); Ratio: Short carbon fibers: Carbon fibers with lengths of 15 mm, 6.5 mm, and 5.5 mm are composed of 0.4 times b, b, and 0.6 times b by mass ratio, where b is the mass of the carbon fiber with the middle length; Carbon nanotubes: The mass is 13.5% of the mass of the short carbon fibers; Copper matrix: The mass ratio of copper, nickel, and chromium is 102:2.2:1.2; Preparation method: A vacuum infiltration hot pressing forming process is adopted, the short carbon fiber and carbon nanotube preform are sintered with copper alloy powder or copper powder in a graphite mold, heated to the melting of the copper alloy or copper, and kept warm for 30 minutes, a protective gas is introduced, pressure is applied for heat preservation and pressure infiltration, and a composite material is obtained after cooling; S2. Insulating layer (4) Material selection: A nano-silica modified ethylene-tetrafluoroethylene copolymer is used as the material of the insulating layer (4), and graphene is added; Ratio: Nano-silica is mixed with [substance] at a mass ratio of 1:100, and then 10% of graphene is added; Preparation method: Through a co-blending and extrusion process, nano-silica, graphene, and ethylene-tetrafluoroethylene copolymer are uniformly mixed, and an even insulating layer (4) is formed on the surface of the conductor (5) through an extrusion coating process; S3. Shielding layer (3) Material selection: A multi-layer composite shielding structure is adopted, including aluminum foil and carbon fiber, and a layer of conductive polymer is added between the aluminum foil and carbon fiber; Ratio: The thickness of the aluminum foil is 0.2 mm, the thickness of the carbon fiber is 0.1 mm, the thickness of the conductive polymer is 0.05 mm, and the mass ratio of the aluminum foil to the carbon fiber is 1:1; Preparation method: The aluminum foil, conductive polymer, and carbon fiber are successively wrapped around the insulating layer (4) to form a multi-layer composite shielding structure; S4. Sheath layer (2) Material selection: The sheath layer (2) adopts a blend of polyether ether ketone and polytetrafluoroethylene, and nano-aluminum oxide and nano-ceramic particles are added; Ratio: Polyether ether ketone and tetrafluoroethylene are mixed at a mass ratio of 7:3, and then 10% of nano-aluminum oxide and 5% of nano-ceramic particles are added; Preparation method: Through an extrusion process, the blend of polyether ether ketone and tetrafluoroethylene and nano-aluminum oxide and nano-ceramic particles are uniformly mixed to form the sheath layer (2); S5. Self-healing anti-corrosion coating Material selection: The coating contains microcapsules; Ratio: The self-healing anti-corrosion coating consists of a matrix material, an auxiliary material, and microcapsules, where the mass of the microcapsules accounts for 20% of the total mass of the coating.

8. The preparation method of a high-strength and corrosion-resistant power cable according to claim 7, characterized in that: During the extrusion coating process of the shielding layer (3), the surface of the conductor (5) and the insulating layer (4) are treated by plasma treatment technology.

9. The preparation method of a high-strength and corrosion-resistant power cable according to claim 8, characterized in that: The specific manufacturing method of the self-healing anti-corrosion coating is as follows: Raw materials: (1) Microcapsules: Core material: Photo-responsive self-healing agent, accounting for 10% of the total mass; Wall material: A blend of polymethyl methacrylate and polyetheramine, accounting for 10% of the total mass; (2) Matrix material: Epoxy resin: As the matrix material, accounting for 50% of the total mass; Bionic material: Polyaniline, accounting for 20% of the total mass; (3) Auxiliary material: Toughening agent: Polyamide resin, accounting for 5% of the total mass; Leveling agent: Polyether-modified polysiloxane, accounting for 2.5% of the total mass; Anti-settling agent: Fumed silica, accounting for 2.5% of the total mass; (4) Manufacturing method Preparation of microcapsules: Using the photo-responsive self-healing agent as the core, it is encapsulated by an emulsifier and a curing agent to form microcapsules, and a blend of polymethyl methacrylate and polyetheramine is used as the wall material; Preparation of the composite membrane: Selection of the porous support: A polyacrylonitrile ultrafiltration membrane is selected as the porous support; Preparation of the aqueous phase: Polyetheramine is dissolved in deionized water to prepare an aqueous solution with a concentration of 0.0225 mol / L; Preparation of the organic phase: Trimellitic acid chloride is dissolved in n-hexane to prepare an organic phase solution with a concentration of 0.0075 mol / L; Reaction process: The porous support is cut into an appropriate size, immersed in the aqueous solution, and dried for thirty minutes; The dried support is immersed in the organic phase solution and kept for ten minutes to allow the two monomers to undergo a polymerization reaction at the interface to form a dense polymer skin; After the reaction is completed, the support is taken out and washed with deionized water and organic solvents respectively to remove unreacted monomers and by-products, forming a composite membrane, and the generated composite membrane is heat-treated; Mixing with the coating: The prepared composite membrane is cut into appropriate sizes. Then, epoxy resin and polyaniline are mixed, and after stirring evenly, microcapsules, composite membrane, toughening agent, leveling agent and anti-settling agent are added, and stirring is continued until uniform to form a self-healing anti-corrosion coating; Coating process: The self-healing anti-corrosion coating containing the composite membrane is evenly coated on the surface of the sheath layer (2). During the coating process, it is ensured that the composite membrane and the coating are fully combined to form a uniform coating; Curing process: The coating is cured by natural drying. During the curing process, the composite membrane and other components in the coating act together to form a complete self-healing anti-corrosion coating.

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