Liquid fire-retardant silicone rubber enhanced magnetic attraction line and processing method thereof

Abstract

This invention belongs to the field of cable technology, specifically relating to a liquid flame-retardant silicone reinforced magnetic wire and its processing method. The magnetic wire comprises, from the inside out, a conductor core, a conductive shielding layer, a magnetic reinforcement composite layer, a liquid flame-retardant silicone insulation layer, and an outer sheath. The liquid flame-retardant silicone insulation layer contains MOFs material. The conductive shielding layer is made by mixing graphite conductive paste and aramid fiber at a weight ratio of 70-80:20-30. The graphite conductive paste is composed of flake graphite, silane coupling agent KH-550, and ethanol at a weight ratio of 100: The mixture is prepared by mixing and dispersing in a ratio of 2-5:30-50; the annular magnetic suction component is formed by mixing neodymium iron boron permanent magnet powder, magnetron shape memory alloy powder and liquid silicone in a weight ratio of 40-60:5-10:30-55; the liquid flame-retardant silicone insulating layer is prepared by mixing basic liquid silicone, modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide, graphene, MOFs material, silane coupling agent and anti-aging agent in a weight ratio of 100:15-25:5-10:10-15:2-5:3-8:1-3:0.5-1.0.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, specifically relating to a liquid flame-retardant silicone reinforced magnetic wire and its processing method. Background Technology

[0002] As a new type of power system integrating advanced information communication, automation control and energy management technologies, the smart grid is developing towards high efficiency, reliability, flexibility and greenness. It puts forward stringent requirements on the performance of insulated power cables and cable accessories. They not only need to have excellent insulation, flame retardancy, mechanical strength and environmental adaptability, but also need to be compatible with the convenient connection and rapid operation and maintenance needs of scenarios such as distributed energy grid connection, V2G bidirectional charging and discharging, and laying in complex outdoor environments.

[0003] Magnetic cables, with their advantages of rapid adsorption and convenient connection, are gradually being applied to cable connection scenarios. However, existing magnetic cables have many technical bottlenecks, making it difficult to adapt to the high-end demands of the smart grid industry: First, the insulation layer mostly uses ordinary rubber or plastic materials, which have poor flame retardant properties, mostly only reaching UL94 V2 level. In the event of a fire, they are prone to melting and dripping, producing toxic fumes, which cannot meet the extremely high electrical safety requirements of the smart grid. Moreover, ordinary insulation materials lack resistance to high and low temperatures, aging, and corrosion. Long-term operation outdoors, in high and low temperature environments, or in acidic soil environments is prone to cracking and aging, leading to insulation failure and grid faults. Second, the magnetic structure of existing magnetic cables is loosely bonded to the conductor and insulation layer, resulting in poor magnetic stability and easy adsorption displacement and detachment. Furthermore, the magnetic connectors are prone to dust and oxidation, leading to poor contact, increased power loss, and inability to adapt to the smart grid industry. The problem stems from several factors: First, the high power and low loss transmission requirements of the smart grid. Second, the insufficient mechanical strength and poor tensile and bending resistance make the cables prone to breakage and insulation damage in outdoor smart grid installations and frequent maintenance scenarios, affecting the continuous and stable operation of the grid. Third, the segmented molding process, which involves first preparing the conductor and magnetic components and then covering them with an insulation layer, results in a loose bond between the insulation layer and the conductor / magnetic components, easily creating gaps, causing local electric field concentration, reducing insulation performance, and having low production efficiency and high cost, making it difficult to meet the needs of large-scale smart grid construction.

[0004] In view of the shortcomings of the existing technologies mentioned above, and in light of the core needs of the smart grid industry for insulated power cables and accessories, there is an urgent need to develop a liquid flame-retardant silicone reinforced magnetic wire and its processing method. Summary of the Invention

[0005] To address the aforementioned shortcomings in the existing technology, this invention provides a liquid flame-retardant silicone reinforced magnetic wire and its processing method to solve the problems mentioned in the background technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a liquid flame-retardant silicone reinforced magnetic wire. The magnetic wire comprises, from the inside out, a conductor core, a conductive shielding layer, a magnetically enhanced composite layer, a liquid flame-retardant silicone insulating layer, and an outer sheath. Each layer is tightly bonded with no obvious interface gaps. It innovatively incorporates two interdisciplinary technologies: MOFs (metal-organic frameworks, at the forefront of materials science) and magnetically controlled shape memory alloys (at the forefront of aerospace / robotics). The specific structure is as follows: Conductor core: Made of multi-strand tin-plated copper wire, with 19-37 strands and a single wire diameter of 0.15-0.3mm. The stranding pitch is 10-15 times the conductor core diameter. The tin plating layer thickness is 0.01-0.03mm, prepared using a hot-dip plating process. This effectively improves the conductor core's oxidation resistance, avoids power loss due to poor contact, and enhances its flexibility and tensile strength. It adapts to the complex laying requirements of smart grids, meets high-power transmission requirements, and has a conductor core resistivity ≤2.5×10⁻⁶. -8 Ω·m ensures low-loss transmission.

[0007] Conductive shielding layer: Covering the outside of the conductor core, with a thickness of 0.1-0.2mm, it is made of graphite conductive paste and aramid fiber, wherein the graphite conductive paste accounts for 70-80wt% and the aramid fiber accounts for 20-30wt%; the graphite conductive paste is made by mixing and dispersing flake graphite, silane coupling agent KH-550 and ethanol in a weight ratio of 100:2-5:30-50. The conductive shielding layer can effectively and uniformly distribute the electric field, avoid insulation layer breakdown caused by local electric field concentration, and at the same time improve the cable's anti-electromagnetic interference capability and protect the integrity of signal transmission.

[0008] Magnetic attraction enhancement composite layer: Embedded and coated on the outside of the conductive shielding layer, with a thickness of 0.3-0.5mm, including annular magnetic attractors and a reinforcing braided layer; the annular magnetic attractor is formed by mixing neodymium iron boron permanent magnet powder and liquid silicone at a weight ratio of 40-60:40-60 to form an annular structure, with the inner diameter of the annulus matching the outer diameter of the conductive shielding layer, and the annulus width of 0.2-0.4mm. The annular magnetic attractors are uniformly distributed along the conductor core axis with a spacing of 5-10mm; innovatively, a magnetically controlled shape memory alloy (cutting-edge in aerospace / robotics) is introduced to modify the surface of the annular magnetic attractor, improving magnetic attraction stability. To enhance fatigue resistance and prevent magnetic force attenuation over long-term use, the reinforcing braided layer is made of a blend of aramid fiber and carbon fiber with a braiding density of 85-95%. This layer tightly wraps around the outer side of the annular magnetic element and adheres closely to the conductive shielding layer and the liquid flame-retardant silicone insulation layer. The magnetic reinforcement composite layer solves the problems of poor magnetic stability and easy detachment in existing magnetic cables, while also improving the mechanical strength of the cable through the reinforcing braided layer. Simultaneously, the embedded design of the annular magnetic element avoids impacting insulation and transmission performance. The magnetic pull force is ≥50N, ensuring firm adsorption and reducing power loss to below 5%.

[0009] Liquid flame-retardant silicone insulating layer: This layer, 0.5-1.0 mm thick, coats the outer surface of the magnetically reinforced composite layer. It is made from domestically produced, controllable halogen-free flame-retardant liquid silicone, innovatively incorporating MOFs (metal-organic frameworks, a cutting-edge technology in materials science) and optimizing the synergistic flame-retardant formulation. The liquid flame-retardant silicone is composed of base liquid silicone, modified aluminum hypophosphite, zinc borate, nano-aluminum hydroxide, graphene, MOFs materials, and a silane coupling agent in a weight ratio of 100:15-25:5-10:10-15:2-5:3-8:1-3. The base liquid silicone is methyl vinyl liquid silicone with a Shore hardness of 50-70A; the modified aluminum hypophosphite is surface-treated... The aluminum hypophosphite modified with a silane coupling agent has a particle size of 1-5 μm; the nano-aluminum hydroxide has a particle size of 50-100 nm; the graphene is graphene oxide with a particle size of 10-20 nm; the MOF material is Zr-MOFs (zirconium-based metal-organic frameworks) with a particle size of 50-100 nm. After modification with a silane coupling agent, it can synergistically improve flame retardancy and corrosion resistance, while adsorbing acidic and alkaline corrosive gases in the environment, preventing long-term corrosion of cables in complex environments, thus solving the problem of insufficient corrosion resistance in existing insulation layers; the liquid flame-retardant silicone insulation layer, after vulcanization molding (partially using photocuring molding process, a cutting-edge precision manufacturing process), achieves a flame retardancy rating of UL94 V0, an oxygen index ≥32 (which can be increased to over 35 after introducing MOFs), a dielectric strength ≥25 kV / mm, and a volume resistivity ≥1×10⁻⁶. 14With a strength of Ω·cm, it possesses excellent high and low temperature resistance (-40℃~150℃), aging resistance, and corrosion resistance, solving the problem that existing insulation materials cannot simultaneously achieve flame retardancy and mechanical strength. It also promotes the replacement of imported liquid silicone with domestically produced liquid silicone, breaking through difficult challenges and meeting the long-term operation requirements of smart grids in outdoor, high and low temperature, and corrosive environments. Furthermore, it is environmentally friendly and halogen-free, complying with RoHS / REACH environmental standards and reducing environmental impact.

[0010] Outer Sheath: Covering the liquid flame-retardant silicone insulation layer, with a thickness of 0.2-0.3mm, made of polyvinyl fluoride (PVDF) material through extrusion molding. The surface of the outer sheath has anti-slip texture and marking texture. The anti-slip texture improves the ease of gripping during cable laying and splicing, while the marking texture indicates the cable specifications, uses, and production information. The outer sheath has excellent wear resistance, corrosion resistance, and waterproof and moisture-proof performance, with a protection level of IP68. It can further protect the liquid flame-retardant silicone insulation layer, preventing it from being damaged by external mechanical forces, chemical corrosion, and moisture intrusion, extending the cable's service life to more than 30 years. It is suitable for complex laying scenarios such as underground, underwater, and chemical industrial parks in smart grids.

[0011] Furthermore, the conductor core is stranded in a right-hand regular stranding manner, and after stranding, it undergoes annealing treatment at a temperature of 200-250℃ for a holding time of 30-60 minutes. Annealing treatment can eliminate the internal stress generated during the stranding process of the conductor core, improve the flexibility and conductivity of the conductor core, reduce power transmission loss, and adapt to the high-power, low-loss transmission requirements of the power system.

[0012] Furthermore, the surface of the annular magnetic chuck is coated with a silane coupling agent coating with a thickness of 0.01-0.02 mm, and simultaneously doped with 5-10 wt% magnetron shape memory alloy powder (cutting-edge in aerospace / robotics field). This can improve the interfacial bonding force between the annular magnetic chuck and the liquid flame-retardant silicone insulating layer and the enhanced braided layer, avoiding delamination and peeling. At the same time, it can improve the oxidation resistance and fatigue resistance of the annular magnetic chuck, prevent poor contact caused by oxidation of the magnetic connector, and extend the service life of the magnetic chuck performance.

[0013] Furthermore, the liquid flame-retardant silicone insulation layer also contains 0.5-1.0 wt% of an anti-aging agent, namely 2,2'-methylenebis(4-methyl-6-tert-butylphenol), which can significantly improve the aging resistance of the liquid flame-retardant silicone insulation layer, extend the service life of the cable under outdoor ultraviolet radiation and alternating high and low temperature environments, and ensure the long-term stable operation of the power system. The addition of MOFs material can further synergistically enhance the aging resistance with the anti-aging agent, while adsorbing small molecule impurities generated during the aging process of the insulation layer, thus slowing down the aging rate.

[0014] A processing method for liquid flame-retardant silicone reinforced magnetic wire The aforementioned processing method breaks through the bottlenecks of traditional cable segmented molding and single vulcanization processes. It innovatively integrates plasma surface modification technology from the aerospace field, micro-injection molding technology from the precision electronics field, and vacuum impregnation technology from the new energy field. Employing an integrated collaborative molding model, combined with existing photopolymerization molding (cutting-edge precision manufacturing) technology, it achieves tight bonding and precise molding of the conductor core, conductive shielding layer, magnetically reinforced composite layer, liquid flame-retardant silicone insulation layer, and outer sheath. This solves the defects of existing processes, such as poor interface bonding, low molding accuracy, insufficient production efficiency, and poor performance stability. It also highlights the creativity of cross-domain process integration. The specific steps are as follows: Conductor core preparation and plasma modification: Select tin-plated copper wires of the appropriate specifications and perform right-hand regular stranding using a stranding device. The stranding pitch is controlled to be 10-15 times the conductor core diameter. After stranding, the conductor core is placed in an annealing furnace for annealing treatment at a temperature of 200-250℃ for 30-60 minutes. After annealing, it is naturally cooled to room temperature. Innovatively, a plasma surface modification process from the aerospace field is introduced. The cooled conductor core is placed in a plasma treatment device, using a mixture of argon and oxygen (volume ratio 8:2) as the discharge gas. The treatment power is 80-120W, the treatment time is 5-10 minutes, and the treatment distance is 5-8mm. By bombarding the conductor core surface with plasma, the surface oxide layer and impurities are removed, increasing the surface roughness and active groups of the conductor core. This significantly improves the interfacial bonding force between the subsequent conductive shielding layer and the conductor core, preventing delamination and further enhancing the oxidation resistance of the conductor core to ensure low-loss transmission. After the treatment, a modified conductor core is obtained.

[0015] Preparation of a conductive shielding layer to ensure stable signal transmission and ultrasonic-vacuum composite molding: Flake graphite, silane coupling agent KH-550, and ethanol are weighed according to the specified weight ratio and placed in an ultrasonic dispersion device. The rotation speed is controlled at 1500-2000 r / min, the dispersion time at 30-60 min, and the dispersion temperature at 25-35℃ to prepare a uniform graphite conductive slurry. Then, the graphite conductive slurry and aramid fiber are weighed according to the specified weight ratio and mixed uniformly. An innovative ultrasonic-assisted weaving and coating process from the precision electronics field is introduced, using a weaving and coating device with ultrasonic vibration function and an ultrasonic power of 50-80W to uniformly mix the materials. The modified conductor core prepared in step 1 is coated with a coating thickness controlled at 0.1-0.2 mm. After coating, a vacuum degassing process from the new energy field is introduced. The coated part is placed in a vacuum degassing tank with a vacuum degree controlled at -0.08 to -0.1 MPa, a degassing temperature of 40-50℃, and a degassing time of 15-20 min. This process thoroughly removes tiny air bubbles inside the conductive shielding layer, avoiding problems such as electric field concentration and reduced shielding effectiveness caused by air bubbles. This yields a conductor core coated with a dense conductive shielding layer. The conductive shielding layer can uniformly distribute the electric field, improve the electromagnetic interference resistance, and meet the application requirements of smart grid digital technology.

[0016] Preparation of Magnetic Reinforced Composite Layer and Micro-Injection Embedded Composite Molding: ① Preparation of Ring-Shaped Magnetic Components: Breaking through the traditional compression molding process, micro-injection molding technology from the precision electronics field is introduced. Neodymium iron boron permanent magnet powder, magnetron shape memory alloy powder, and liquid silicone are weighed according to a specific weight ratio, mixed evenly, and then placed into a micro-injection molding device. The injection temperature is 110-130℃, the injection pressure is 15-20MPa, the holding pressure is 10-12MPa, the holding time is 3-5min, and the mold temperature is 40-50℃. Precise injection molding results in a ring structure with a molding accuracy of ±0.01mm, far exceeding the accuracy of traditional compression molding. After molding, the component is removed, cooled to room temperature, and coated with a silane coupling agent to obtain a high-precision ring-shaped magnetic component. ② Preparation of Reinforced Braided Layer: Aramid fiber and carbon fiber are weighed according to a specific weight ratio, blended using a blending equipment to produce blended fibers, and then braided using a braiding equipment to form a reinforcing braided layer. The braiding density is controlled at 85-95%. ③ Embedded Coating: Introducing a precision positioning and bonding process from the aerospace field, a vision positioning system (positioning accuracy ±0.005mm) is used to uniformly arrange the annular magnetic components along the axial direction of the conductor core coated with the conductive shielding layer obtained in step 2, with a spacing controlled at 5-10mm. After positioning and fixing, the reinforcing braided layer is tightly wrapped around the annular magnetic components and the outside of the conductive shielding layer to ensure that all components fit tightly without gaps, resulting in a semi-finished product coated with a magnetic reinforcement composite layer; micro-injection molding improves the precision of the magnetic components, and precise positioning ensures magnetic stability, while the reinforcing braided layer enhances mechanical strength.

[0017] Preparation of liquid flame-retardant silicone insulating layer and vacuum impregnation-photocuring composite molding: ① Preparation of liquid flame-retardant silicone: Weigh the base liquid silicone, modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide, graphene, MOF materials, silane coupling agent and anti-aging agent according to the weight ratio, and put them into a high-speed mixing device. The speed is controlled at 2500-3000 r / min, and a segmented mixing method is used to ensure that each component is evenly dispersed; ② Coating and Molding: Breaking through the traditional extrusion coating process, a vacuum impregnation process from the new energy field is introduced. The semi-finished product obtained in step 3 is placed in a vacuum impregnation tank, and the prepared liquid flame-retardant silicone is injected. The vacuum degree is controlled at -0.09~-0.1MPa, the impregnation temperature is 60-70℃, and the impregnation time is 20-30min. This allows the liquid flame-retardant silicone to fully penetrate into the gaps of the magnetically reinforced composite layer, ensuring that there are no interface gaps between the insulation layer and the composite layer, and significantly improving the insulation reliability. After impregnation, a "vulcanization + photocuring" composite molding process (cutting-edge precision manufacturing technology) is adopted. The product is first sent to a vulcanization furnace for further processing. The initial vulcanization process involves a vulcanization temperature of 120-150℃, a vulcanization pressure of 8-12MPa, and a vulcanization time of 10-15 minutes. A secondary curing process is then performed using UV curing equipment, with a curing time of 5-10 minutes and a curing temperature of 80-100℃. This composite molding process can shorten molding time by more than 30%, improving production efficiency while ensuring a dense and defect-free insulation layer, thus enhancing flame retardant and insulation properties. After molding and cooling to room temperature, a semi-finished product coated with a liquid flame-retardant silicone insulation layer is obtained. This process solves the problem of traditional extrusion coating failing to fill minute gaps, significantly improving insulation performance.

[0018] Outer sheath coating and laser engraving-extrusion composite molding: The semi-finished product obtained in step 4 is placed in the outer sheath extrusion equipment, and polyvinyl fluoride material is used for extrusion coating. The coating thickness is controlled at 0.2-0.3mm, the extrusion temperature is controlled at 180-220℃, and the extrusion speed is 5-10m / min. The laser engraving process from the precision electronics field is innovatively introduced. During the extrusion coating process, a laser engraving device (engraving accuracy ±0.002mm) is used simultaneously to engrave anti-slip patterns and marking patterns on the surface of the outer sheath, replacing the traditional pressing pattern process. The patterns are clearer and more wear-resistant. At the same time, the markings are more accurate and refined, which facilitates cable specification identification and subsequent maintenance. After coating and engraving are completed, the cable is cooled to room temperature to obtain a liquid flame-retardant silicone-reinforced magnetic cable semi-finished product. The outer sheath improves the cable's protective performance and adapts to complex environments. The laser engraving process further enhances the product's refinement and practicality.

[0019] Inspection and Cutting (Online Monitoring Optimization): Introducing online visual inspection and real-time performance monitoring technology from the Industry 4.0 field, the semi-finished products obtained in step 5 undergo full-process, all-round inspection. Inspection items include: appearance quality (laser visual inspection, recognition accuracy ±0.001mm), dimensional accuracy, flame retardancy, insulation performance, magnetic attraction performance, mechanical performance, electromagnetic interference resistance, and environmental resistance. Data is fed back in real time during the inspection process, and unqualified products are immediately rejected to ensure product consistency. After passing the inspection, the products are cut according to actual needs using cutting equipment, with the cutting length controlled between 1-100m. After cutting, the products are packaged to obtain the finished products. The comprehensive monitoring process significantly improves inspection efficiency and accuracy, ensures product reliability, and meets the needs of large-scale applications in power systems.

[0020] Furthermore, in step 2, the ultrasonic dispersion equipment adopts a dual-frequency ultrasonic disperser (20kHz+40kHz), combined with a vacuum degassing process, which can ensure that the graphite conductive slurry is evenly dispersed and free from agglomeration, while completely removing internal air bubbles, improving the density and shielding effectiveness of the conductive shielding layer, with the shielding effectiveness improved by more than 10% compared to traditional processes; the temperature is controlled at 25-35℃ during the dispersion process to avoid the dispersion temperature being too high and affecting the material properties.

[0021] Furthermore, in step 3, the micro-injection molding equipment uses a precision micro-injection machine equipped with a constant temperature control system and a pressure feedback system. This allows for precise control of the injection temperature, pressure, and holding time, ensuring the dimensional accuracy and consistency of the annular magnetic component. The dimensional deviation is ≤±0.01mm, far exceeding the ±0.05mm of traditional compression molding. The neodymium iron boron permanent magnet powder has a particle size of 10-20μm and is pre-treated using a ball mill for 2-4 hours. After ball milling, it undergoes drying at a temperature of 80-100℃. The interval is 10-20 minutes, which can improve the dispersion of NdFeB permanent magnet powder and magnetron shape memory alloy powder, ensuring uniform and stable magnetic attraction performance of the ring magnetic chuck; the magnetron shape memory alloy powder is a Ni-Ti-Cu alloy with a particle size of 5-10μm, and is surface modified to improve compatibility with liquid silicone; the vision positioning system uses a CCD industrial camera, combined with image processing algorithms, to achieve precise positioning and arrangement of the ring magnetic chuck, with a positioning accuracy of ±0.005mm, avoiding magnetic instability caused by arrangement deviation.

[0022] Furthermore, in step 4, the high-speed mixing equipment adopts a planetary high-speed mixer, and the mixing process adopts a segmented mixing method: first, the basic liquid silica gel and silane coupling agent are mixed for 10-20 minutes, then modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide, and MOFs materials are added and mixed for 30-40 minutes, and finally graphene and anti-aging agent are added and mixed for 20-30 minutes. This ensures that each component is evenly dispersed and avoids the agglomeration of flame retardants and MOFs materials. In the vacuum impregnation process, by precisely controlling the vacuum degree and impregnation temperature and time, the liquid flame retardant silica gel can fully penetrate into the fine gaps of the magnetically reinforced composite layer, fill the gaps that traditional extrusion coating cannot cover, improve the interfacial bonding force between the insulation layer and the composite layer, and avoid delamination. Before the MOFs materials are added, the surface is modified with silane coupling agent KH-560 to improve the compatibility with liquid silica gel and avoid affecting the fluidity and impregnation effect of silica gel.

[0023] Furthermore, in step 6, the online visual inspection uses laser visual inspection equipment, which can quickly identify minor defects such as minor damage, bubbles, and blurred textures on the outer protective layer surface, with an identification accuracy of ±0.001mm and an inspection efficiency that is more than 80% higher than that of traditional manual inspection. Real-time performance monitoring uses an integrated inspection module to simultaneously detect flame retardant performance, insulation performance, and magnetic attraction performance. Inspection data is uploaded to the control system in real time, enabling the immediate removal of unqualified products. The pass / fail standards for the inspection items are as follows: no damage, no bubbles, no delamination in appearance; dimensional deviation ≤ ±0.05mm; flame retardant rating reaches UL94 V0 level; oxygen index ≥32 (≥35 after introducing MOFs); dielectric strength ≥25kV / mm; volume resistivity ≥1×10⁻⁶. 14 Ω·cm; magnetic attraction force ≥50N, adsorption without deviation or detachment; tensile strength ≥8MPa, elongation at break ≥500%, bending resistance ≥10000 times (bending radius is 5 times the cable diameter); shielding effectiveness ≥130dB; high and low temperature resistance meets the requirement of no cracking or deformation in environments ranging from -40℃ to 150℃; corrosion resistance meets the requirement of no damage or significant decrease in insulation performance after immersion in acidic soil and salt spray environments for 1000 hours; protection level reaches IP68; power loss ≤5%.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. By introducing cutting-edge MOF materials (Zr-MOFs) and deeply integrating them with the original synergistic flame retardant system (modified aluminum hypophosphite + zinc borate + nano aluminum hydroxide + graphene), the flame retardant rating is stabilized at UL94 V0 level and the oxygen index is increased to over 35. It also endows the insulation layer with excellent corrosive gas adsorption capacity, solving the pain point of cable corrosion in complex outdoor environments. At the same time, it synergistically improves aging resistance and extends the service life of the cable to over 35 years. 2. The introduction of a magnetron shape memory alloy modified ring magnetic chuck improves magnetic stability and fatigue resistance, avoiding magnetic force attenuation over long-term use. Magnetic stability is improved by more than 60% compared to existing technologies. The enhanced braided layer and multi-strand stranded annealed conductor core work together to significantly improve the cable's tensile and bending resistance. Tensile strength ≥8MPa, elongation at break ≥500%, and bending resistance ≥10,000 times prevent cable breakage and damage during outdoor installation and frequent maintenance. Mechanical strength is improved by more than 30% compared to existing technologies. Attached Figure Description

[0025] Figure 1 This is a flowchart of a processing method for a liquid flame-retardant silicone-reinforced magnetic wire according to the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this application. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0028] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0030] A liquid flame-retardant silicone-reinforced magnetic wire comprises, from the inside out, a conductor core 1, a conductive shielding layer 2, a magnetic enhancement composite layer 3, a liquid flame-retardant silicone insulating layer 4, and an outer sheath 5. MOF materials and a magnetically controlled shape memory alloy are incorporated. Specific parameters are as follows: Conductor core 1: Made of 19 strands of tin-plated copper wire, with a single strand diameter of 0.15 mm and a stranding pitch 10 times the conductor core diameter; the tin plating thickness is 0.01 mm, prepared by hot-dip plating process, followed by annealing treatment at 200℃ for 30 min; conductor core resistivity ≤ 2.5 × 10⁻⁶. -8 Ω·m.

[0031] Conductive shielding layer 2: The thickness is 0.1 mm. It is made by mixing graphite conductive paste and aramid fiber at a weight ratio of 70:30. The graphite conductive paste is made by mixing and dispersing flake graphite, silane coupling agent KH-550 and ethanol at a weight ratio of 100:2:30. It is dispersed by ultrasonic disperser at a dispersion temperature of 25℃ and a dispersion time of 30 min.

[0032] The magnetically enhanced composite layer 3 has a thickness of 0.3 mm. The annular magnetic component 31 is formed by mixing neodymium iron boron permanent magnet powder, Ni-Ti-Cu magnetron shape memory alloy powder and liquid silicone in a weight ratio of 38:5:57. The particle size of the neodymium iron boron permanent magnet powder is 10 μm, and the particle size of the magnetron shape memory alloy powder is 5 μm. After ball milling pretreatment for 2 h and drying at 80 °C for 10 min, the inner diameter of the ring matches the outer diameter of the conductive shielding layer. The ring width is 0.2 mm and is uniformly distributed along the conductor core axis with a spacing of 5 mm. The surface is coated with a 0.01 mm thick silane coupling agent coating. The reinforcing braided layer 32 is made of aramid fiber and carbon fiber blend, with a braiding density of 85%.

[0033] Liquid flame-retardant silicone insulating layer 4: The thickness is 0.5mm. It is made by mixing base liquid silicone (methyl vinyl liquid silicone, Shore hardness 50A), modified aluminum hypophosphite (particle size 1μm), zinc borate, nano aluminum hydroxide (particle size 50nm), graphene (graphene oxide, particle size 10nm), Zr-MOFs material (particle size 50nm, modified by KH-560), silane coupling agent and anti-aging agent in a weight ratio of 100:15:5:10:2:3:1:0.5. The mixture is mixed in stages using a planetary high-speed mixer. First, the base liquid silicone and silane coupling agent are mixed for 10min. Then, the modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide and Zr-MOFs material are added and mixed for 30min. Finally, the graphene and anti-aging agent are added and mixed for 20min. The mixing speed is 2500r / min and the total mixing time is 60min.

[0034] Outer protective layer 5: 0.2mm thick, made of polyvinyl fluoride, extruded at 180℃ and 5m / min, with anti-slip texture and markings on the surface, and an IP68 protection rating.

[0035] The specific steps of the above-mentioned processing method for liquid flame-retardant silicone reinforced magnetic wire are as follows: Conductor core preparation: 19 strands of 0.15mm thick tin-plated copper wire were selected and twisted in a right-hand regular direction. The twisting pitch was 10 times the diameter of the conductor core. After twisting, the wire was placed in an annealing furnace and annealed at 200℃ for 30 minutes. After cooling to room temperature, the conductor core was obtained.

[0036] Preparation and coating of conductive shielding layer: Weigh flake graphite, silane coupling agent KH-550 and ethanol according to the proportion, disperse them in an ultrasonic disperser at 25℃ for 30 min to prepare graphite conductive slurry; then mix the graphite conductive slurry with aramid fiber, weave and coat it on the outside of the conductor core with a thickness of 0.1 mm to obtain the conductor core coated with conductive shielding layer.

[0037] Preparation of magnetically reinforced composite layer and micro-injection-embedded composite molding: ① Preparation of ring-shaped magnetic components: Neodymium iron boron permanent magnet powder, magnetron shape memory alloy powder and liquid silicone were weighed according to the proportion, mixed evenly, and then injected at 120℃ and 18MPa using a micro-injection molding equipment. The holding pressure was 11MPa and the holding time was 4min. The mold temperature was 45℃. After molding and cooling, a silane coupling agent coating was applied; ② Preparation of reinforcing braided layer: Aramid fiber and carbon fiber were blended and braided to a braiding density of 85%; ③ Embedded coating: Using a CCD vision positioning system, the ring-shaped magnetic components were arranged along the conductor core axis with a spacing of 5mm. After positioning and fixing, the reinforcing braided layer was applied to obtain a semi-finished product.

[0038] Preparation of liquid flame-retardant silicone insulation layer and vacuum impregnation-photocuring composite molding: ① Preparation of liquid flame-retardant silicone: Weigh each component according to the proportion, mix them in stages using a planetary high-speed mixer to prepare liquid flame-retardant silicone; ② Coating and molding: Place the semi-finished product into a vacuum impregnation tank, impregnate at -0.095MPa and 65℃ for 25min, inject liquid flame-retardant silicone, after impregnation, first vulcanize at 120℃ and 8MPa for 10min, then cure with ultraviolet light for 5min (temperature 80℃), cool to room temperature to obtain the semi-finished product.

[0039] Outer protective layer coating and laser engraving-extrusion composite molding: The semi-finished product is placed into the extrusion equipment, and polyvinyl fluoride is extruded to a thickness of 0.2mm. The extrusion temperature is 180℃ and the speed is 5m / min. At the same time, anti-slip texture and marking texture are engraved on the surface of the outer protective layer using laser engraving equipment. After cooling to room temperature, the semi-finished product is obtained.

[0040] Inspection and Cutting: Online visual inspection and real-time performance monitoring equipment are used to conduct comprehensive inspection of the semi-finished products. After passing the inspection, the products are cut into 1-meter lengths and packaged to obtain the finished products. Example 2

[0041] A liquid flame-retardant silicone-reinforced magnetic wire comprises, from the inside out, a conductor core 1, a conductive shielding layer 2, a magnetic enhancement composite layer 3, a liquid flame-retardant silicone insulating layer 4, and an outer sheath 5. MOF materials and a magnetically controlled shape memory alloy are incorporated. Specific parameters are as follows: The finished product prepared in this embodiment tested as follows: no damage, no bubbles, no delamination in appearance; dimensional deviation ≤ ±0.05mm; flame retardant rating UL94 V0; oxygen index 35; dielectric strength 25kV / mm; volume resistivity 1×10⁻⁶. 14 Ω·cm; magnetic attraction force 50N, adsorption without deviation or detachment; tensile strength 8MPa, elongation at break 500%, bending resistance 10,000 times; shielding effectiveness 130dB; high and low temperature resistance meets -40℃~150℃ without cracking or deformation; corrosion resistance meets acidic soil and salt spray environment immersion for 1000h without damage or significant decrease in insulation performance; protection level IP68, power loss 5%; using domestic liquid silicone, breaking import dependence, reducing production cost by 20%, and increasing production efficiency by 25% (photocuring process shortens molding time by 30%).

[0042] Conductor core 1: Made of 28 strands of tin-plated copper wire, with a single strand diameter of 0.22 mm and a stranding pitch 12 times the conductor core diameter; the tin plating layer thickness is 0.02 mm, prepared by hot-dip plating process, followed by annealing treatment at 220℃ for 45 min; the conductor core resistivity is ≤2.5×10⁻⁶. -8 Ω·m.

[0043] Conductive shielding layer 2: The thickness is 0.15mm, and it is made by mixing graphite conductive paste and aramid fiber in a weight ratio of 75:25. The graphite conductive paste is made by mixing and dispersing flake graphite, silane coupling agent KH-550 and ethanol in a weight ratio of 100:3:40. It is dispersed by ultrasonic disperser at a dispersion temperature of 30℃ and a dispersion time of 45min.

[0044] The magnetically enhanced composite layer 3 has a thickness of 0.4 mm. The annular magnetic component 31 is formed by mixing neodymium iron boron permanent magnet powder, Ni-Ti-Cu magnetron shape memory alloy powder and liquid silicone in a weight ratio of 45:7:48. The particle size of the neodymium iron boron permanent magnet powder is 15 μm, and the particle size of the magnetron shape memory alloy powder is 8 μm. After ball milling pretreatment for 3 h and drying at 90 °C for 15 min, the inner diameter of the ring matches the outer diameter of the conductive shielding layer. The ring width is 0.3 mm and is uniformly distributed along the conductor core axis with a spacing of 8 mm. The surface is coated with a 0.015 mm thick silane coupling agent coating. The reinforcing braided layer 32 is made of aramid fiber and carbon fiber blend with a braiding density of 90%.

[0045] Liquid flame-retardant silicone insulating layer 4: The thickness is 0.8mm. It is made by mixing base liquid silicone (methyl vinyl liquid silicone, Shore hardness 60A), modified aluminum hypophosphite (particle size 3μm), zinc borate, nano aluminum hydroxide (particle size 80nm), graphene (graphene oxide, particle size 15nm), Zr-MOFs material (particle size 80nm, modified by KH-560), silane coupling agent and anti-aging agent in a weight ratio of 100:20:8:12:3:5:2:0.8. The mixture is mixed in stages using a planetary high-speed mixer. First, the base liquid silicone and silane coupling agent are mixed for 15min. Then, the modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide and Zr-MOFs material are added and mixed for 35min. Finally, the graphene and anti-aging agent are added and mixed for 25min. The mixing speed is 2800r / min and the total mixing time is 75min.

[0046] Outer protective layer 5: 0.25mm thick, made of polyvinyl fluoride, extruded at 200℃ and 8m / min, with anti-slip texture and markings on the surface, and an IP68 protection rating.

[0047] The processing method for the above-mentioned liquid flame-retardant silicone reinforced magnetic wire is as follows: Annealing temperature 220℃, holding time 45min; ultrasonic dispersion temperature 30℃, time 45min; pressing temperature of the annular magnetic component 110℃, pressure 8MPa, holding time 15min; liquid flame-retardant silicone curing temperature 135℃, pressure 10MPa, curing time 12min, ultraviolet curing time 8min (temperature 90℃); extrusion temperature of the outer protective layer 200℃, speed 8m / min; cutting length 50m.

[0048] The finished product prepared in this embodiment tested the following results: no damage, no bubbles, no delamination in appearance; dimensional deviation ≤ ±0.05mm; flame retardant rating UL94 V0; oxygen index 37; dielectric strength 28kV / mm; volume resistivity 5×10⁻⁶. 14Ω·cm; magnetic attraction force 55N, adsorption without deviation or detachment; tensile strength 9MPa, elongation at break 550%, bending resistance 12000 times; shielding effectiveness 135dB; high and low temperature resistance meets -40℃~150℃ without cracking or deformation; corrosion resistance meets acidic soil and salt spray environment immersion for 1000h without damage or significant decrease in insulation performance; protection level IP68, power loss 4%; production cost reduced by 22%, production efficiency increased by 28%, product qualification rate 99.6%, aging resistance life reaches 32 years, operation and maintenance cost reduced by 42%, suitable for high-end scenario requirements such as UHVDC transmission, can smooth grid peak load by 22%, improve grid peak regulation capacity by 32%, and reduce transmission loss to within 4.5%. Example 3

[0049] A liquid flame-retardant silicone-reinforced magnetic wire comprises, from the inside out, a conductor core 1, a conductive shielding layer 2, a magnetic enhancement composite layer 3, a liquid flame-retardant silicone insulating layer 4, and an outer sheath 5. MOF materials and a magnetically controlled shape memory alloy are incorporated. Specific parameters are as follows: Conductor core 1: Made of 37 strands of tin-plated copper wire, with a single strand diameter of 0.3 mm and a stranding pitch 15 times the conductor core diameter; the tin plating thickness is 0.03 mm, prepared by hot-dip plating process, followed by annealing treatment at 250℃ for 60 min; conductor core resistivity ≤ 2.5 × 10⁻⁶. -8 Ω·m.

[0050] Conductive shielding layer 2: The thickness is 0.2mm, and it is made by mixing graphite conductive slurry and aramid fiber in a weight ratio of 80:20. The graphite conductive slurry is made by mixing and dispersing flake graphite, silane coupling agent KH-550 and ethanol in a weight ratio of 100:5:50. It is dispersed by an ultrasonic disperser at a dispersion temperature of 35℃ and a dispersion time of 60min.

[0051] The magnetically enhanced composite layer 3 has a thickness of 0.5 mm. The annular magnetic component 31 is formed by mixing neodymium iron boron permanent magnet powder, Ni-Ti-Cu magnetron shape memory alloy powder and liquid silicone in a weight ratio of 54:8:38. The particle size of the neodymium iron boron permanent magnet powder is 20 μm, and the particle size of the magnetron shape memory alloy powder is 10 μm. After ball milling pretreatment for 4 h and drying at 100℃ for 20 min, the inner diameter of the ring matches the outer diameter of the conductive shielding layer. The ring width is 0.4 mm and is uniformly distributed along the conductor core axis with a spacing of 10 mm. The surface is coated with a 0.02 mm thick silane coupling agent coating. The reinforcing braided layer 32 is made of aramid fiber and carbon fiber blend, with a braiding density of 95%.

[0052] Liquid flame-retardant silicone insulating layer 4: The thickness is 1.0 mm. It is made by mixing base liquid silicone (methyl vinyl liquid silicone, Shore hardness 70A), modified aluminum hypophosphite (particle size 5μm), zinc borate, nano aluminum hydroxide (particle size 100nm), graphene (graphene oxide, particle size 20nm), Zr-MOFs material (particle size 100nm, modified by KH-560), silane coupling agent and anti-aging agent in a weight ratio of 100:25:10:15:5:8:3:1.0. The mixture is mixed in stages using a planetary high-speed mixer. First, the base liquid silicone and silane coupling agent are mixed for 20 min. Then, the modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide and Zr-MOFs material are added and mixed for 40 min. Finally, the graphene and anti-aging agent are added and mixed for 30 min. The mixing speed is 3000 r / min and the total mixing time is 90 min.

[0053] Outer protective layer 5: 0.3mm thick, made of polyvinyl fluoride, extruded at 220℃ and 10m / min, with anti-slip texture and markings on the surface, and an IP68 protection rating.

[0054] The processing method for the above-mentioned liquid flame-retardant silicone reinforced magnetic wire is as follows: annealing temperature 250℃, holding time 60min; ultrasonic dispersion temperature 35℃, time 60min; ring magnetic component pressing temperature 120℃, pressure 10MPa, holding time 20min; liquid flame-retardant silicone curing temperature 150℃, pressure 12MPa, curing time 15min, ultraviolet curing time 10min (temperature 100℃); outer protective layer extrusion temperature 220℃, speed 10m / min; cutting length 100m.

[0055] The finished product prepared in this embodiment tested the following results: no damage, no bubbles, no delamination in appearance; dimensional deviation ≤ ±0.05mm; flame retardant rating UL94 V0; oxygen index 39; dielectric strength 30kV / mm; volume resistivity 8×10⁻⁶. 14Ω·cm; magnetic attraction force 60N, adsorption without deviation or detachment; tensile strength 10MPa, elongation at break 600%, bending resistance 15000 times; shielding effectiveness 140dB; high and low temperature resistance meets -40℃~150℃ without cracking or deformation; corrosion resistance meets acidic soil and salt spray environment immersion for 1000h without damage or significant decrease in insulation performance; protection level IP68, power loss 3.5%; production cost reduced by 25%, production efficiency increased by 30%, product qualification rate 99.8%, aging resistance life reaches 35 years, operation and maintenance cost reduced by 45%, can smooth grid peak load by 25%, improve grid peak regulation capacity by 35%, reduce transmission loss to within 3.5%, suitable for extreme and complex scenarios such as submarine power transmission and power transmission in extremely cold regions, and can be widely used in high-end power systems and aerospace, rail transportation and other fields.

[0056] Comparative Example To further highlight the creativity and necessity of the cross-disciplinary cutting-edge technology integration of this invention, Example 2 (the optimal example) was selected as a reference, and three sets of comparative examples were designed, each lacking a different cross-disciplinary technology, while the remaining structure and process parameters were completely identical to Example 2. The differences in detection performance were compared, as follows: Comparative Example 1 (Conventional magnetic wicks lacking all cutting-edge cross-disciplinary technologies) The magnetic wick differs from that of Example 2 of this invention in the following ways: ① No MOFs material is added to the liquid flame-retardant silicone insulating layer; ② The annular magnetic wick is not doped with magnetron shape memory alloy powder; ③ The liquid flame-retardant silicone insulating layer is not formed using a "vulcanization + photocuring" composite process, but only a single vulcanization process; the remaining parameters and processes are completely consistent with those of Example 2.

[0057] Performance test results: Flame retardant rating UL94 V1, oxygen index 29; dielectric strength 22kV / mm, volume resistivity 2×10⁻⁶ 14 Ω·cm; magnetic attraction force 42N, magnetic attraction force decreases by 25% after long-term use (simulated 3 years of operation), easy to fall off; tensile strength 7.2MPa, elongation at break 420%, bending resistance 8500 times; shielding effectiveness 125dB; power loss 6.5%; high and low temperature resistance meets -35℃~140℃, corrosion resistance meets the requirement that insulation performance decreases by 30% after immersion in acidic soil and salt spray environment for 1000h; protection level IP67; production efficiency is 28% lower than Example 2, production cost is 5% lower than Example 2; product qualification rate 97%, aging resistance life 22 years, operation and maintenance cost is 40% higher than Example 2.

[0058] Conclusion: Without the MOFs material, magnetron shape memory alloy and "vulcanization + photocuring" composite process introduced in this invention, the flame retardancy, corrosion resistance, magnetic stability, mechanical strength and production efficiency of the product are significantly reduced, making it unable to meet the high-end requirements of the power system. This highlights the core creativity and necessity of the cross-domain technology integration of this invention.

[0059] Comparative Example 2 (Missing MOFs Material and Photocuring Process) The magnetic attraction wire differs from that of Example 2 of this invention in the following ways: ① No MOFs material is added to the liquid flame-retardant silicone insulating layer; ② The liquid flame-retardant silicone insulating layer is formed using only a single vulcanization process, without the "vulcanization + photocuring" composite process; the remaining parameters and processes (including magnetron shape memory alloy) are completely consistent with Example 2.

[0060] Performance test results: Flame retardant rating UL94 V0, oxygen index 32; dielectric strength 25kV / mm, volume resistivity 4×10⁻⁶ 14 Ω·cm; magnetic attraction force 54N, stable adsorption, magnetic attraction force decreases by 8% with long-term use; tensile strength 8.8MPa, elongation at break 520%, bending resistance 11000 times; shielding effectiveness 133dB; power loss 4.8%; high and low temperature resistance meets -40℃~150℃, corrosion resistance meets the requirement that insulation performance decreases by 15% after immersion in acidic soil and salt spray environment for 1000h; protection level IP68; production efficiency is 20% lower than Example 2, production cost is 4% lower than Example 2; product qualification rate 99%, aging resistance life 28 years, operation and maintenance cost is 15% higher than Example 2.

[0061] Conclusion: The absence of MOFs materials leads to a decrease in the flame retardancy, corrosion resistance, and aging resistance of the products. The absence of the "vulcanization + photocuring" composite process results in a decrease in production efficiency. This highlights the key role of MOFs materials in synergistically improving flame retardancy, corrosion resistance, and aging resistance, as well as the advantages of the "vulcanization + photocuring" process in improving production efficiency. This further verifies the innovative value of these two cross-disciplinary technologies.

[0062] Comparative Example 4 (Modification of Magnetically Controlled Shape Memory Alloy) The structure and preparation process of the magnetic wick differ from those of Example 2 of this invention in that the annular magnetic wick is not doped with magnetron shape memory alloy powder; the other parameters and processes (including MOF materials and photocuring process) are completely consistent with those of Example 2.

[0063] Performance test results: Flame retardant rating UL94 V0, oxygen index 37; dielectric strength 28kV / mm, volume resistivity 5×10⁻⁶ 14Ω·cm; magnetic attraction force 50N, long-term use (simulated 3 years of operation) magnetic attraction force decays by 20%, prone to adsorption displacement; tensile strength 8.9MPa, elongation at break 540%, bending resistance 11800 times; shielding effectiveness 134dB; power loss 4.2%; high and low temperature resistance meets -40℃~150℃, corrosion resistance meets acidic soil and salt spray environment immersion for 1000h without damage, insulation performance without significant decline; protection level IP68; production efficiency is 28% higher than Example 2, production cost is 3% lower than Example 2; product qualification rate 99.4%, aging resistance life 31 years, operation and maintenance cost is 10% higher than Example 2.

[0064] Conclusion: The lack of magnetron shape memory alloys leads to rapid decay of magnetic force and insufficient magnetic stability in ring-shaped magnetic chucks. This highlights the key role of this cutting-edge technology in the aerospace / robotics field in improving the fatigue resistance of magnetic chucks and extending their service life, thus solving the problem of easy detachment of traditional magnetic chucks after long-term use.

[0065] The above are merely embodiments of the present invention. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The scope of protection in this application does not involve improvements to the software and methods. Commonly known structures and characteristics in the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all prior art in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the application.

Claims

1. A liquid flame-retardant silicone reinforced magnetic wick, characterized in that: From the inside out, it includes a conductor core, a conductive shielding layer, a magnetically enhanced composite layer, a liquid flame-retardant silicone insulating layer, and an outer protective layer; the annular magnetic attractor is doped with magnetron shape memory alloy powder, and the liquid flame-retardant silicone insulating layer is enriched with MOF materials; The conductive shielding layer is made by mixing graphite conductive slurry and aramid fiber in a weight ratio of 70-80:20-30. The graphite conductive slurry is made by mixing and dispersing flake graphite, silane coupling agent KH-550 and ethanol in a weight ratio of 100:2-5:30-50. The magnetic attraction enhanced composite layer includes an annular magnetic attraction element and an enhanced braided layer. The annular magnetic attraction element is formed by mixing neodymium iron boron permanent magnet powder, magnetron shape memory alloy powder and liquid silicone in a weight ratio of 40-60:5-10:30-55. The liquid flame-retardant silicone insulating layer is made by mixing basic liquid silicone, modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide, graphene, MOF materials, silane coupling agent and anti-aging agent in a weight ratio of 100:15-25:5-10:10-15:2-5:3-8:1-3:0.5-1.

0.

2. The liquid flame-retardant silicone reinforced magnetic wire as described in claim 1, characterized in that: The conductor core is made of 19-37 strands of tin-plated copper wire twisted in a right-hand regular direction. The diameter of a single copper wire is 0.15-0.3 mm, the twisting pitch is 10-15 times the diameter of the conductor core, and the tin plating thickness is 0.01-0.03 mm. After twisting, it undergoes annealing treatment at 200-250℃ for 30-60 minutes, and the resistivity of the conductor core is ≤2.5×10⁻⁶. -8 Ω·m.

3. The liquid flame-retardant silicone reinforced magnetic wire as described in claim 1, characterized in that: The inner diameter of the annular magnetic attractor matches the outer diameter of the conductive shielding layer. The annular width is 0.2-0.4 mm, and it is evenly distributed along the conductor core axis with a spacing of 5-10 mm. The surface is covered with a 0.01-0.02 mm thick silane coupling agent coating.

4. The liquid flame-retardant silicone reinforced magnetic wire as described in claim 1, characterized in that: The base liquid silica gel is methyl vinyl liquid silica gel, and the MOFs material is Zr-MOFs.

5. The liquid flame-retardant silicone reinforced magnetic wire as described in claim 1, characterized in that: The outer protective layer is made of polyvinyl fluoride material and has anti-slip texture and marking texture on the surface.

6. The liquid flame-retardant silicone reinforced magnetic wire as described in claim 1, characterized in that: The reinforcing braided layer is made of a blend of aramid fiber and carbon fiber.

7. A method for processing liquid flame-retardant silicone reinforced magnetic wire, characterized in that: Includes the following steps; 1. Select tin-plated copper wire and strand it. After stranding, place the conductor core in an annealing furnace for annealing treatment. The annealing temperature is 200-250℃, and the holding time is 30-60 minutes. After annealing, allow it to cool naturally to room temperature. Place the cooled conductor core in a plasma treatment device. After treatment, a modified conductor core is obtained. 2 Weigh out flake graphite, silane coupling agent KH-550 and ethanol according to the weight ratio, put them into an ultrasonic dispersion device for treatment, and prepare graphite conductive slurry; then weigh out graphite conductive slurry and mix it with aramid fiber according to the weight ratio, and uniformly coat the outside of the modified conductor core prepared in step 1 with the mixed material. After the coating is completed, put the coated part into a vacuum degassing tank for degassing treatment to obtain a conductor core coated with a dense conductive shielding layer.

3. Weigh neodymium iron boron permanent magnet powder, magnetron shape memory alloy powder and liquid silicone according to the weight ratio, mix them evenly, put them into a micro-injection molding equipment to form, take them out and cool them to room temperature, coat them with a layer of silane coupling agent coating to obtain a high-precision ring magnetic chuck; arrange the ring magnetic chuck evenly along the axial direction of the conductor core coated with the conductive shielding layer obtained in step 2, fix it in position, and tightly wrap the reinforcing braid layer on the outside of the ring magnetic chuck and the conductive shielding layer to obtain a semi-finished product coated with a magnetic reinforcement composite layer.

8. The processing method of a liquid flame-retardant silicone reinforced magnetic wire as described in claim 7, characterized in that: It also includes step 4: Weigh the base liquid silica gel, modified aluminum hypophosphite, zinc borate, nano aluminum hydroxide, graphene, MOF materials, silane coupling agent and anti-aging agent according to the weight ratio, put them into the mixing equipment, control the speed at 2500-3000 r / min, and adopt the segmented mixing method. The semi-finished product obtained in step 3 is placed in a vacuum impregnation tank, and the prepared liquid flame-retardant silicone is injected. The vacuum degree is controlled at -0.09~-0.1MPa, the impregnation temperature is 60-70℃, and the impregnation time is 20-30min. After impregnation, it is first sent to a vulcanizing furnace for preliminary vulcanization. The vulcanization temperature is 120-150℃, the vulcanization pressure is 8-12MPa, and the vulcanization time is 10-15min. Then, a second curing is carried out using an ultraviolet curing device. The curing time is 5-10min, and the curing temperature is 80-100℃. After molding, it is cooled to room temperature to obtain a semi-finished product coated with a liquid flame-retardant silicone insulating layer.

9. The processing method of a liquid flame-retardant silicone reinforced magnetic wire as described in claim 8, characterized in that: The process also includes step 5: the semi-finished product obtained in step 4 is placed in an extrusion device and extruded and coated with polyvinyl fluoride material. The coating thickness is controlled at 0.2-0.3 mm, the extrusion temperature is controlled at 180-220℃, and the extrusion speed is 5-10 m / min. During the extrusion and coating process, anti-slip textures and marking textures are simultaneously engraved on the surface of the outer protective layer using a laser engraving device. After the coating and engraving are completed, the product is cooled to room temperature to obtain the semi-finished product of liquid flame-retardant silicone reinforced magnetic attraction wire.

10. The processing method of a liquid flame-retardant silicone reinforced magnetic wire as described in claim 9, characterized in that: The semi-finished product obtained in step 5 is cut into pieces according to actual needs using a cutting device. After cutting, it is packaged to obtain the finished product.

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