A rodent and termite resistant flame retardant cable

Abstract

The utility model discloses a kind of rat-proof termite-proof flame-retardant cable, including cable core and the outer sheath of wrapping in the outer surface of the cable core, a plurality of cores are provided in the cable core, first self-repairing layer is provided in the core;The outer sheath is 5-layer structure, from inside to outside, it is in turn wrapping tape, first flame-retardant layer, second flame-retardant layer, rat-proof termite-proof protective layer, second self-repairing layer.The utility model has the following beneficial effects with reasonable structure design: the utility model is provided with double self-repairing layer and double flame-retardant layer, there is also rat-proof termite-proof protective layer simultaneously, integrated self-repairing, long-acting rat-proof termite-proof, efficient flame-retardant performance, successfully solve the contradiction between the mechanical property and electrical property of existing cable protection performance, open up new path for the development of cable technology, prolong the service life of cable, applicable to various complex, harsh and extremely high safety and stability requirement of power transmission scene for cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a rodent-proof, ant-proof, and flame-retardant cable. Background Technology

[0002] In the current cable application field, various technical methods have been developed to address rodent and ant damage and improve flame retardant performance. However, these existing technologies generally suffer from a series of problems that urgently need to be solved.

[0003] Traditional methods for rodent and ant control fall into two main categories: one is the use of chemical repellents, such as capsaicin and matrine; the other is the construction of physical protective structures, such as armor layers and brass tape wrapping. However, chemical repellents suffer from serious volatility and failure issues. When they are added directly to the cable sheath, they gradually evaporate into the surrounding environment over time, causing the protective effect to continuously decline and significantly shortening the actual protective life of the cable, making it difficult to meet the requirements for long-term stable operation.

[0004] In terms of flame retardant technology, commonly used flame retardants such as magnesium hydroxide and antimony trioxide can improve the flame retardant performance of cables to a certain extent. However, if added in excess, they will inevitably damage the cable's flexibility, tensile strength, and other mechanical properties. This means that when pursuing higher flame retardant standards, the physical durability and operability of the cable will be negatively affected, causing many inconveniences in actual installation and use.

[0005] More critically, existing cables generally lack self-healing capabilities. During long-term use, the cable sheath is highly susceptible to damage from external environmental corrosion and mechanical impacts and friction. Once the sheath is damaged, if it cannot repair itself in time, the internal structure of the cable will be further exposed to the harsh environment, causing secondary damage and potentially leading to serious safety hazards such as leakage and short circuits, posing a significant threat to personnel safety and the normal operation of equipment. Utility Model Content

[0006] The purpose of this utility model is to provide a rodent-proof, ant-proof, and flame-retardant cable that integrates self-healing, long-lasting rodent-proof, ant-proof, and highly efficient flame-retardant properties, thereby resolving the long-standing contradiction between the protective performance, mechanical performance, and electrical performance of existing cables.

[0007] To achieve the above objectives, the present invention provides a rodent-proof, termite-proof, and flame-retardant cable, comprising a cable core and an outer sheath covering the outer surface of the cable core. The cable core contains a plurality of wire cores, and each wire core contains a first self-healing layer. The outer sheath has a 5-layer structure, consisting of, from the inside out, a wrapping tape, a first flame-retardant layer, a second flame-retardant layer, a rodent-proof and termite-proof protective layer, and a second self-healing layer.

[0008] Furthermore, the number of wire cores is 4, and the 4 wire cores are arranged symmetrically at the four corners.

[0009] Furthermore, the core includes a plurality of conductors and a first self-healing layer wrapped around the plurality of conductors.

[0010] Furthermore, the number of conductors is 7, with one conductor located at the center of the wire core and the remaining 6 conductors surrounding the conductor located at the center of the wire core.

[0011] Furthermore, the conductor is a tin-plated copper conductor, formed by stranding multiple tin-plated copper wires; the first self-healing layer comprises dynamically cross-linked polyurethane and microencapsulated repair agent siloxane.

[0012] Furthermore, the cable core also includes a filler material, which fills the gaps between the wire cores in the cable core. The filler material is rock wool rope.

[0013] Furthermore, the wrapping tape is a single layer of low-smoke halogen-free flame-retardant tape, with a wrapping overlap rate of 20%-30%.

[0014] Furthermore, the first flame-retardant layer is a ceramicized silicone rubber layer; the second flame-retardant layer is an intumescent flame-retardant coating, mainly comprising an ammonium polyphosphate / pentaerythritol system.

[0015] Furthermore, the rodent-proof and ant-proof protective layer is a double-layered woven stainless steel wire; the second self-healing layer includes a thermoplastic elastomer and dual microcapsules.

[0016] Furthermore, the dual microcapsule comprises a repair capsule and a repellent capsule, wherein the repair capsule contains a silicone-based prepolymer and the repellent capsule is filled with a natural repellent agent.

[0017] In summary, the device structure of this utility model is reasonably designed. Utilizing the technical solution of this utility model has the following beneficial effects: This utility model is equipped with a double self-healing layer and a double flame-retardant layer, as well as a rodent-proof and termite-proof protective layer. It integrates self-healing, long-lasting rodent-proof and termite-proof, and highly efficient flame-retardant properties, successfully resolving the contradiction between the existing cable protection performance and mechanical and electrical performance. This opens up a new path for the development of cable technology, extends the service life of cables, and is suitable for various complex and harsh power transmission scenarios with extremely high requirements for cable safety and stability, such as urban underground integrated pipe corridors, power facilities in remote rural areas, and special environments such as chemical enterprises. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of the rodent-proof, termite-proof, and flame-retardant cable of this utility model;

[0019] Explanation of reference numerals in the attached diagram: 1-Conductor; 2-First self-healing layer; 3-Filling material; 4-Wrapping tape; 5-First flame-retardant layer; 6-Second flame-retardant layer; 7-Rodent-proof and termite-proof protective layer; 8-Second self-healing layer Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, but this does not constitute a limitation on the scope of protection of the present utility model.

[0021] In this utility model, for clearer description, the following explanation is provided: The observer faces the attached... Figure 1 When observing, the observer's left front side is designated as "front," the observer's right rear side as "rear," the observer's left rear side as "left," the observer's right front side as "right," the observer's top as "up," and the observer's bottom as "down." It should be noted that the terms "front end," "rear end," "left side," "right side," "middle," "above," and "below" in this text indicate orientations or positional relationships based on the accompanying drawings. These are merely for the purpose of clearly describing the present invention and do not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used only for the purpose of clarity or simplification of description and should not be construed as indicating or implying relative importance or quantity.

[0022] This utility model is deeply involved in the field of cable technology, focusing on the development of a rodent-proof, termite-proof, and flame-retardant cable. This cable cleverly integrates self-healing function, long-lasting and reliable rodent-proof and termite-proof performance, and high-efficiency flame-retardant performance. It is especially suitable for various complex and harsh power transmission scenarios with extremely high requirements for cable safety and stability, such as urban underground integrated pipe corridors, power facilities in remote areas, and special environments such as chemical enterprises.

[0023] See Figure 1 This utility model provides a rodent-proof, termite-proof, and flame-retardant cable, including a cable core and an outer sheath wrapped around the outer surface of the cable core. The cable core contains a plurality of wire cores, and each wire core contains a first self-healing layer 2. The outer sheath has a 5-layer structure, consisting of a wrapping tape 4, a first flame-retardant layer 5, a second flame-retardant layer 6, a rodent-proof and termite-proof protective layer 7, and a second self-healing layer 8, from the inside out.

[0024] Specifically, the number of wire cores is 4, and the 4 wire cores are arranged symmetrically at the four corners. Specifically, the wire core includes 7 conductors 1 and a first self-healing layer 2 wrapped around the 7 conductors 1. Specifically, the positions of the conductors 1 are arranged such that one conductor 1 is located at the center of the wire core, and the other 6 conductors 1 surround the conductor 1 located at the center of the wire core.

[0025] Specifically, conductor 1 is a tin-plated copper conductor, which is made of multiple strands of tin-plated copper wires twisted together; the first self-healing layer 2 includes dynamically cross-linked polyurethane and microencapsulated repair agent siloxane.

[0026] The conductor 1 of this cable is made of multiple strands of tin-plated copper wire. Tin plating is crucial, as it significantly improves the corrosion resistance of the copper wire, effectively preventing oxidation and corrosion in harsh environments such as humidity and acid / alkali conditions, thus ensuring the long-term stable and reliable conductivity of conductor 1. The multi-strand stranded structure also offers numerous advantages. It greatly enhances the flexibility of conductor 1, allowing the cable to be easily bent in complex wiring environments, facilitating installation and maintenance. Simultaneously, this structure also improves the current-carrying capacity of conductor 1, meeting diverse power transmission requirements.

[0027] The first self-healing layer 2 is made by extruding a layer of self-healing insulating material, using dynamically cross-linked polyurethane as the matrix material. This material has a unique molecular structure and properties, enabling reversible cross-linking and de-cross-linking of molecular chains under certain conditions. Based on this, a microencapsulated repair agent, siloxane, is cleverly embedded. When the insulation layer develops microcracks due to external factors, the stress at the cracks causes the microcapsules to rupture, releasing the siloxane repair agent. The siloxane rapidly reacts with the surrounding polyurethane matrix, filling the microcracks and achieving self-repair of the insulation layer, effectively restoring its insulation performance and ensuring the safe and stable transmission of electricity.

[0028] Specifically, the cable core also includes a filler 3, which fills the gaps between the wire cores in the cable core. The filler 3 is a rock wool rope.

[0029] Filler 3 is made of rock wool rope, and the filling standard is to make the cable core round. Rock wool rope has many advantages, as follows:

[0030] Excellent flame retardant properties: Its main component is fiber made from natural rock, which is non-combustible and has an oxygen index of more than 60%, effectively preventing the spread of flames when exposed to fire.

[0031] Good thermal insulation: In the event of a fire, rock wool rope can form a thermal insulation layer, reducing the internal temperature of the cable and protecting the insulation layer and conductor1.

[0032] It has a good structural reinforcement effect: it can fill the gaps inside the cable, prevent the conductor from shaking and wearing the insulation layer, and absorb mechanical stress, thereby improving the cable's impact resistance.

[0033] Specifically, the wrapping tape 4 is a single layer of low-smoke halogen-free flame-retardant tape, with an overlap rate of 20%-30%.

[0034] During cabling, a single layer of low-smoke halogen-free flame-retardant tape is used for wrapping, with the overlap rate controlled at 20%-30%. This design has significant advantages, as detailed below:

[0035] In terms of flame retardancy: it can effectively block the spread of flames and reduce fire hazards.

[0036] Safe and environmentally friendly: Its low-smoke and halogen-free characteristics ensure that no toxic halide gases or large amounts of smoke are produced during combustion, thus protecting personnel safety and ensuring the normal operation of equipment.

[0037] Balancing protection and economy: Overlapping wrapping enhances the overall sealing and integrity, reduces external environmental erosion of the cable's interior, protects the cable insulation layer, and extends its service life. An appropriate overlap rate ensures protective effectiveness while avoiding material waste, meeting safety requirements while maintaining economic efficiency. It is widely applicable to locations with high fire prevention and environmental protection requirements, such as high-rise buildings and subways.

[0038] Specifically, the first flame-retardant layer 5 is a ceramicized silicone rubber layer; the second flame-retardant layer 6 is an intumescent flame-retardant coating, mainly containing an ammonium polyphosphate / pentaerythritol system.

[0039] The first flame-retardant layer 5 is made of ceramicized silicone rubber. At normal temperatures, this material exhibits good flexibility and insulation properties, providing basic protection for the cable. However, when exposed to high temperatures, such as in the event of a fire, the ceramicized silicone rubber rapidly undergoes physicochemical changes, forming a hard, ceramic-like shell. This shell possesses extremely high temperature resistance and excellent insulation properties, effectively blocking the spread of flames and preventing further heat transfer to the cable's interior. Simultaneously, it enhances the cable's insulation performance in high-temperature environments, ensuring the cable can maintain normal operation for a certain period during a fire.

[0040] The second flame-retardant layer 6 is covered with an intumescent flame-retardant coating, which mainly comprises an ammonium polyphosphate / pentaerythritol system. In the event of a fire, the coating expands rapidly upon heating, forming a thick char layer. This char layer has excellent heat insulation properties and the ability to isolate oxygen, effectively preventing flames from contacting the cable body and cutting off the oxygen supply—one of the three essential elements of combustion—thus achieving highly efficient flame retardancy and significantly reducing the damage to the cable caused by a fire.

[0041] Specifically, the rodent-proof and ant-proof protective layer 7 is a double-layered braided stainless steel wire; the second self-healing layer 8 includes a thermoplastic elastomer and dual microcapsules.

[0042] A double layer of stainless steel wire is woven outside the flame-retardant layer as a rodent- and termite-proof protective layer. Stainless steel has extremely high hardness and strength, reaching Shore D65, providing strong physical protection for the cable. Animals such as rodents and ants have difficulty gnawing through the stainless steel wire, effectively preventing them from damaging the internal structure of the cable. At the same time, the double-layer woven mesh design further enhances the protective effect; even if the outer woven mesh is partially damaged, the inner woven mesh can still continue to provide protection.

[0043] The second self-healing layer 8 uses thermoplastic elastomer (TPE) as the substrate and embeds dual microcapsules. TPE material combines the high elasticity of rubber with the plasticity of plastic, exhibiting excellent processing and mechanical properties. Its internally doped dynamic disulfide bond crosslinking network can undergo reversible crosslinking and decrosslinking reactions when heated or subjected to mechanical stress. When the outer sheath is damaged, under certain conditions, the dynamic disulfide bond crosslinking network can rearrange and recombine, achieving self-repair of the outer sheath and restoring its physical properties and protective function.

[0044] The dual microcapsule system comprises repair capsules and repellent capsules, as detailed below:

[0045] Repair capsule: Contains a silicone-based prepolymer. When the outer sheath is damaged, the repair capsule ruptures, releasing the silicone-based prepolymer. This prepolymer then reacts with certain substances in the air or the surrounding environment, rapidly solidifying to fill the damaged area and repair the outer sheath.

[0046] Repellent capsules: Filled with natural repellents. As the outer sheath is damaged, the repellent capsules gradually rupture, releasing the natural repellents. These natural repellents create a repellent zone around the damaged area, further enhancing the cable's repellency against rodents and ants and preventing them from causing further damage at the damaged point.

[0047] Specifically, the dual microcapsules include a repair capsule and a repellent capsule. The repair capsule contains a silicone-based prepolymer, and the repellent capsule is filled with a natural repellent.

[0048] The core objective of this invention is to overcome the numerous limitations of existing technologies and innovatively develop a new type of cable that integrates multiple superior properties such as self-healing, long-lasting rodent and ant protection, and high-efficiency flame retardancy. Through ingenious structural innovation and advanced material composite technology, this invention aims to completely resolve the long-standing contradiction between protective performance and mechanical and electrical performance in existing technologies, thus opening up a completely new path for the development of cable technology.

[0049] The specific preparation method of this utility model is as follows:

[0050] 1. Conductor Pretreatment and Stranding: First, the copper wire is tin-plated. A professional process ensures that the surface of the copper wire is uniformly covered with a tin layer, thereby effectively improving its corrosion resistance. After tin plating, the copper wire is stranded according to a specific stranding process. This process fully considers the characteristics of the copper wire, so that the stranded conductor has both good flexibility and current carrying capacity.

[0051] 2. First self-healing layer extrusion: A 90# extruder is used to extrude the first self-healing layer on the outside of the conductor, strictly controlling the insulation layer thickness within the range of 1.0mm-1.4mm. During the extrusion process, it is ensured that the insulation layer is tightly bonded to the conductor and has a uniform thickness, providing a reliable guarantee for the electrical insulation performance of the cable.

[0052] 3. Cable Core Filling and Flame-Retardant Tape Wrapping: During cable assembly, aiming for a round cable core, rock wool rope is used for filling the center and perimeter. After filling, a 0.2mm thick layer of low-smoke halogen-free flame-retardant tape is mechanically wrapped around the cable core. During the wrapping process, the overlap rate of each layer is strictly controlled between 20% and 30% to ensure a smooth, wrinkle-free wrapping surface, thereby enhancing the cable's flame-retardant performance and overall structural stability.

[0053] 4. Multi-layer protective structure fabrication: A 1.6mm-2.0mm thick ceramicized silicone rubber layer is extruded over the flame-retardant strip using a 120# extruder. Subsequently, a 0.4mm-0.6mm thick intumescent flame-retardant coating is applied over the ceramicized silicone rubber layer. After the flame-retardant coating is completed, double layers of 0.2mm-0.3mm diameter stainless steel wire are braided onto the outside. During the braiding process, the mesh spacing is ensured to be uniform, and the braiding density reaches 80% or higher to enhance the cable's mechanical strength and protective performance. Finally, a 1.8mm-2.0mm thick outer sheath containing a repellent is extruded over the braided layer using a co-extrusion process, ensuring a tight bond between the sheath and the internal structure, thus constructing a complete protective system.

[0054] 5. Uniform Microcapsule Dispersion and Embedding: Using a twin-screw extrusion process, repair and repellent capsules are uniformly dispersed within the TPE substrate of the outer sheath. During extrusion, key process parameters such as temperature and screw speed are precisely controlled to ensure the microcapsules are evenly distributed within the substrate and remain intact. In this way, the outer sheath not only possesses self-healing capabilities but also excellent rodent and termite resistance, effectively extending the cable's lifespan.

[0055] The specific beneficial effects of this utility model are as follows:

[0056] 1. Integrated Self-Healing Function: Through a unique dynamic cross-linking network and microcapsule synergistic mechanism, dual self-healing functions are achieved for both the insulation layer and the outer sheath. In actual testing, the repair efficiency is as high as ≥85% (within 30 minutes), which can quickly and effectively repair various minor damages that occur in the cable during use, greatly improving the cable's reliability and service life.

[0057] 2. Long-lasting rodent and ant protection: Innovatively combining physical barriers (stainless steel braided mesh) with chemical repellency (slow-release microspheres). After rigorous ASTM D3638 testing, it achieves a repellency rate of >98% and withstands >1500 bites, far surpassing traditional rodent and ant-proof cables, providing long-term reliable protection for cables in environments with high rodent and ant activity.

[0058] 3. High-efficiency flame retardancy and environmental friendliness: Utilizing a ceramicized silicone rubber + intumescent flame retardant system, the cable meets Class A flame retardancy requirements according to GB / T 18380 standard testing, demonstrating excellent flame retardant performance. Furthermore, the entire cable system uses halogen-free, low-smoke materials, complying with IEC 60754 environmental standards. This ensures fire safety while reducing environmental pollution, offering significant environmental advantages.

[0059] 4. Synergistic Performance Optimization: Through meticulously designed material composites and structural optimization, excellent compatibility between the flame-retardant layer and the self-healing material is achieved. While ensuring high-efficiency flame-retardant performance, the cable's tensile strength is ≥18MPa, a 20% improvement compared to traditional flame-retardant cables. This effectively solves the negative impact of traditional flame retardants on mechanical properties, achieving synergistic optimization of various performance characteristics.

[0060] The specific implementation method is as follows:

[0061] Example 1

[0062] 1. Conductor: Seven tinned copper wires are stranded together, and the cross-sectional area of ​​the stranded conductor is 25mm2, ensuring good conductivity and mechanical strength.

[0063] 2. First self-healing layer: A 1.2mm first self-healing layer is extruded, with dynamic polyurethane as the matrix material, and 2% siloxane microcapsules are uniformly added to it to form an insulating layer with high self-healing ability.

[0064] 3. Filler: Rock wool rope is used for filling during cable making, with the standard being that the cable core is round.

[0065] 4. Wrapping tape: The cable core is wrapped with two layers of 0.2mm thick low-smoke halogen-free flame-retardant tape, mechanically overlapped, with each layer overlapping at 10%-20%, and the surface is flat and wrinkle-free.

[0066] 5. Flame-retardant protective layer (first flame-retardant layer and second flame-retardant layer): The inner layer is a ceramicized silicone rubber layer with a thickness of 1.8mm, and the outer layer is an intumescent coating with a thickness of 0.5mm. The two layers work together to provide strong flame-retardant protection.

[0067] 6. Rodent and ant protection layer: Two layers of 0.3mm diameter 316L stainless steel wire are woven together, and the coverage of the woven mesh reaches 85%, providing reliable physical protection for the cable.

[0068] 7. Second self-healing layer: A 1.9mm thick self-healing rodent- and ant-proof outer protective layer is extruded. The outer protective layer is based on TPE, and 0.5% capsaicin microcapsules are evenly dispersed in it to achieve long-term repellency against rodents and ants.

[0069] Example 2

[0070] 1. Conductor: Seven tinned copper wires are stranded together, and the cross-sectional area of ​​the stranded conductor is 25mm2, ensuring good conductivity and mechanical strength.

[0071] 2. First self-healing layer: A 1.4mm first self-healing layer is extruded, with dynamic polyurethane as the matrix material, and 3% siloxane microcapsules are uniformly added to it to further improve the self-healing performance.

[0072] 3. Filler: Rock wool rope is used for filling during cable making, with the standard being that the cable core is round.

[0073] 4. Wrapping tape: The cable core is wrapped with two layers of 0.2mm thick low-smoke halogen-free flame-retardant tape, mechanically overlapped, with the overlap rate of each layer controlled at 15%-25%, and the surface is flat and wrinkle-free.

[0074] 5. Flame-retardant protective layer: The inner layer is a 2.0mm thick ceramicized silicone rubber layer, and the outer layer is a 0.6mm thick intumescent coating. The two layers work together to provide strong flame-retardant protection.

[0075] 6. Rodent and termite protection layer: Two layers of 0.3mm diameter 304 stainless steel wire are woven together, and the coverage of the woven mesh reaches 90%, providing reliable physical protection for the cable.

[0076] 7. Second self-healing layer: A 2.0mm thick self-healing rodent and ant repellent outer protective layer is extruded. The outer protective layer is based on TPE, and 0.6% azadirachtin microcapsules are added to the TPE base material to enrich the types of repellents and improve the rodent and ant repellent effect.

[0077] Example 3

[0078] 1. Conductor: Seven tinned copper wires are stranded together, and the cross-sectional area of ​​the conductor remains at 25mm2 after stranding. The stable conductor performance provides strong support for the overall performance of the cable.

[0079] 2. Self-healing insulation layer: A 1.0mm thick self-healing insulation layer is extruded, using dynamic polyurethane as the matrix material and incorporating 1.5% siloxane microcapsules. This combination effectively balances cost while ensuring a certain level of self-healing performance, making it suitable for cost-sensitive applications.

[0080] 3. Filling layer: Rock wool rope is used for filling during cabling to ensure the cable core is round and maintain the stable structure of the cable.

[0081] 4. Wrapping tape: A layer of 0.2mm thick low-smoke halogen-free flame-retardant tape is mechanically overlapped around the outside of the cable core, with the overlap rate controlled between 20% and 30%. This wrapping method simplifies the structure while still ensuring good flame-retardant and mechanical protection performance, and ensuring a smooth, wrinkle-free surface.

[0082] 5. Flame-retardant protective layer: The inner layer is a 1.6mm thick ceramicized silicone rubber layer, and the outer layer is a 0.4mm thick intumescent coating. This thickness combination optimizes the cable structure and reduces the overall weight of the cable while ensuring flame-retardant performance.

[0083] 6. Rodent-proof layer: Utilizing two layers of stainless steel wire of different materials, the inner layer is made of 0.2mm diameter 316L stainless steel wire, and the outer layer is made of 0.2mm diameter 304 stainless steel wire, with a braided mesh coverage of 80%. This design enhances the cable's protection level and strengthens its protection against rodent damage.

[0084] 7. Self-healing outer sheath: A 1.9mm thick self-healing rodent- and termite-repellent outer sheath is extruded, using TPE as the base material, and simultaneously incorporating 0.3% capsaicin microcapsules and 0.2% azadirachtin microcapsules. The synergistic effect of the two repellents significantly enhances the rodent- and termite-repellent effect of the outer sheath, while the TPE base material ensures the proper functioning of the outer sheath's self-healing properties.

[0085] The performance test results are shown in the table below:

[0086]

[0087] The above data analysis shows that, compared with the prior art, this utility model has the following significant advantages:

[0088] 1. Breakthrough in single protection mode: By innovatively constructing a triple protection system of "self-repair + physical barrier + chemical slow release", the service life of the cable is effectively extended. According to actual simulation tests, the service life can be extended by more than 50% compared with traditional cables, which greatly improves the reliability and stability of the cable.

[0089] 2. Synergistic effect of flame retardancy and self-healing: Successfully solved the problem of negative impact of traditional flame retardants on the mechanical properties of cables. By optimizing material composition and structural design, a synergistic improvement in flame retardancy and self-healing properties was achieved, improving the physical durability and operability of cables while ensuring their safe operation.

[0090] 3. Enhanced Environmental Friendliness: Halogen-free materials comprise over 90% of the materials used in this invention, and the repellent is made from natural ingredients such as capsaicin and azadirachtin. This not only reduces environmental pollution during cable production and use but also lowers potential health hazards, aligning with current green and environmentally friendly development trends.

[0091] This invention, through in-depth materials research, innovative structural design, and advanced manufacturing processes, has successfully developed a highly reliable, rodent- and termite-proof, self-healing, and flame-retardant cable suitable for complex environments. This cable exhibits superior performance in self-healing, rodent and termite prevention, flame retardancy, and mechanical properties, making it particularly suitable for high-risk and complex scenarios such as subway tunnels, forest power grids, and chemical plants. The technological achievements of this invention have significant industrialization prospects, and are expected to drive technological upgrading and product innovation in the cable industry, providing strong technical support for ensuring the safe and stable transmission of electricity.

[0092] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A rodent-proof, termite-proof, and flame-retardant cable, comprising a cable core and an outer sheath wrapped around the outer surface of the cable core, characterized in that: The cable core contains several wire cores, and each wire core contains a first self-healing layer; the outer sheath has a 5-layer structure, consisting of, from the inside out, a wrapping tape, a first flame-retardant layer, a second flame-retardant layer, a rodent-proof and ant-proof protective layer, and a second self-healing layer.

2. The rodent-proof, termite-proof, and flame-retardant cable according to claim 1, characterized in that: The number of wire cores is 4, and the 4 wire cores are arranged symmetrically at the four corners.

3. The rodent-proof, termite-proof, and flame-retardant cable according to claim 1 or 2, characterized in that: The core comprises several conductors and a first self-healing layer wrapped around the conductors.

4. The rodent-proof, termite-proof, and flame-retardant cable according to claim 3, characterized in that: The number of conductors is 7, with one conductor located at the center of the core and the remaining 6 conductors surrounding the conductor located at the center of the core.

5. The rodent-proof, termite-proof, and flame-retardant cable according to claim 4, characterized in that: The conductor is a tin-plated copper conductor, which is made of multiple strands of tin-plated copper wire twisted together; the first self-healing layer includes dynamically cross-linked polyurethane and microencapsulated repair agent siloxane.

6. A rodent-proof, termite-proof, and flame-retardant cable according to claim 1, 2, 4, or 5, characterized in that: The cable core also includes a filler material, which fills the gaps between the wire cores in the cable core. The filler material is rock wool rope.

7. The rodent-proof, termite-proof, and flame-retardant cable according to claim 6, characterized in that: The wrapping tape is a single layer of low-smoke halogen-free flame-retardant tape, with an overlap rate of 20%-30%.

8. A rodent-proof, termite-proof, and flame-retardant cable according to claim 1, 2, 4, 5, or 7, characterized in that: The first flame-retardant layer is a ceramicized silicone rubber layer; the second flame-retardant layer is an intumescent flame-retardant coating, mainly comprising an ammonium polyphosphate / pentaerythritol system.

9. The rodent-proof, termite-proof, and flame-retardant cable according to claim 8, characterized in that: The rodent-proof and ant-proof protective layer is a double-layered woven stainless steel wire; the second self-healing layer includes a thermoplastic elastomer and dual microcapsules.

10. A rodent-proof, termite-proof, and flame-retardant cable according to claim 1 or 9, characterized in that: The dual microcapsule comprises a repair capsule and a repellent capsule, wherein the repair capsule contains a silicon-based prepolymer and the repellent capsule is filled with a natural repellent agent.

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