Environment-friendly flame-retardant fireproof intelligent cable and production method thereof

Abstract

The invention discloses an environment-friendly flame-retardant fireproof intelligent cable and a production method thereof, relates to the technical field of cables, and adopts the structural arrangement to integrate the functions of temperature measurement, partial discharge measurement and vibration measurement; the temperature measuring optical fiber and the condensate water pipeline are linked, and when the operating temperature of the cable rises, the condensate water pipeline can increase water flow, improve heat dissipation efficiency, improve the load capacity of the cable and prolong the service life of the cable. Data measured by the optical fiber can be transmitted to a measurement host in real time, and the risk coefficient of cable danger caused by data missing is reduced. Moreover, the on-site time of operation and maintenance personnel can be reduced, and the operation and maintenance cost is reduced. The vibration optical fiber can find abnormal vibration exceeding a set range around in time, feeds back data to operation and maintenance personnel in the first time, and arrives at the site in time to solve emergencies.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to an environmentally friendly flame-retardant fireproof intelligent cable and a production method thereof. BACKGROUND

[0002] With the rapid development of new infrastructure, new energy, rail transportation and other fields, the demand for safety performance, environmental properties and intelligent operation and maintenance capability of cables has significantly increased, but existing products have multiple technical bottlenecks; Halogen-containing flame-retardant cables release toxic smoke during combustion, which is harmful to the environment and rescue. Non-halogen flame-retardant cables have poor mechanical and insulating properties due to high filling of inorganic flame retardants, making it difficult to balance flame retardation, environmental protection and use reliability. The mainstream fireproof cable adopts a structure of "flame-retardant sheath + mica tape", which is easy to be invaded by fire due to wrapping defects, and the insulating material has insufficient high-temperature resistance. High-temperature resistant materials are also limited by cost and processing difficulty and cannot be applied on a large scale. Traditional cables lack real-time monitoring functions and rely on manual inspection, resulting in delayed fault warning. A few products with integrated monitoring modules also have problems such as incompatibility between sensors and cable structure, signal interference and reduced flame-retardant level. In the production process, the extrusion of non-halogen flame-retardant materials is prone to equipment wear, low efficiency and large fluctuations in product performance. The "rear embedding" process of intelligent modules also easily damages the cable structure, affecting waterproof sealing and production efficiency. In summary, existing cables cannot meet the needs of high safety, environmental protection and intelligence, and the development of new cables that meet these requirements has become a key to the industry. SUMMARY

[0003] In view of the above deficiencies of the prior art, the present application provides an environmentally friendly flame-retardant fireproof intelligent cable and a production method thereof. The cable has the characteristics of multifunctional integration and efficient heat dissipation. By integrating temperature measurement, vibration measurement, partial discharge measurement and communication transmission functions, and introducing circulating condensed water and hollow heat dissipation layer into the cable, the overall monitoring and efficient heat dissipation of the cable operation state are realized, and the reliability, service life and operation and maintenance efficiency of the cable are improved.

[0004] To achieve the above-mentioned application purposes, the technical solutions adopted by the present application are as follows: An environmentally friendly flame-retardant fireproof intelligent cable is provided, which comprises, from the inside to the outside, a cable core part, a flame-retardant layer, a fire-resistant layer, a polyurethane protective layer, an armored layer and an outer protective layer. The cable core part comprises a plurality of cable cores; the flame-retardant layer comprises a low-smoke halogen-free flame-retardant glass fiber tape covering the cable core part, and the low-smoke halogen-free flame-retardant glass fiber tape is filled with flame-retardant glass fiber ropes between the cable core part; The fire-resistant layer comprises, from the inside to the outside, a ceramicized fire-resistant silicone rubber layer, a polyurethane-based directional graphene film and a metal corrugated pipe; and a plurality of cavities are arranged between the ceramicized fire-resistant silicone rubber layer and the polyurethane-based directional graphene film, and a liquid metal capsule is arranged in each cavity. The preparation method of the liquid metal capsule is: A1: Liquid metal eutectic gallium-indium alloy EGaIn and sodium dodecyl sulfate SDS are added into deionized water, and shearing emulsification is performed to obtain a liquid metal emulsion with a particle size of 5-20 μm; A2: Polyurethane prepolymer is added dropwise into the liquid metal emulsion, the pH is adjusted to 3.5, and reaction is performed for 2 h; A3: After centrifugation, washing and vacuum drying, a liquid metal capsule is obtained.

[0005] The metal bellows can isolate the flame at the initial stage of fire, and the corrugated shape can slow down the heat propagation efficiency; when there is high-temperature flame outside, the ceramifiable fire-resistant silicone rubber can automatically generate a hard ceramic layer, effectively protecting the normal use of the conductor.

[0006] Further, the cable core comprises, from inside to outside, a copper wire conductor, a ceramifiable polyolefin layer, a cross-linked polyolefin layer and a temperature-resistant silicone rubber protective layer, and a temperature measurement optical fiber and a partial discharge measurement optical fiber are embedded in the temperature-resistant silicone rubber protective layer.

[0007] Further, a condensate water pipeline is further arranged between the low-smoke halogen-free flame-retardant glass fiber belt and the cable core part, and the cable core part is obtained by twisting three cable cores, three condensate water pipelines and the flame-retardant glass fiber rope, the three cable cores are located at the center of the cable core part, and the three condensate water pipelines are uniformly arranged on the circumference outside the three cable cores.

[0008] Further, the outer protective layer comprises, from inside to outside, a low-smoke halogen-free polyolefin protective layer and a polyurethane outer protective layer, and a vibration optical fiber is embedded in the low-smoke halogen-free polyolefin protective layer.

[0009] Further, the optical fiber cores of the temperature measurement optical fiber, the partial discharge measurement optical fiber and the vibration optical fiber are all provided with the same corrugated weaving-gradient bonding structure, and the preparation method of the corrugated weaving-gradient bonding structure is as follows: B1: Glass yarn is immersed in a KH550-ethanol solution at 3 g / mL to obtain a preformed material; the KH550-ethanol solution is prepared by using KH550, ethanol and water, wherein the amount ratio of KH550 to ethanol is 1 g:10-15 mL, and the total solute concentration in the KH550-ethanol solution is 3%; B2: The preformed material is placed in a corrugated mold, and after hot forming at 280℃ for 5 s, the corrugated glass fiber net is obtained by irradiating with ultraviolet light at a wavelength of 365 nm at 3000 mJ / cm 2 ; B3: The corrugated glass fiber net is heated to 80℃, and a KH550 silane atomized liquid with a particle size of 10 μm is uniformly sprayed on the surface, and then a temperature-resistant silicone rubber protective sleeve is immediately coated to complete the preparation of the corrugated weaving-gradient bonding structure.

[0010] Outside the optical fiber, a dynamic stress buffer layer is constructed on the surface of the optical fiber through the corrugated weaving-gradient bonding structure, and the micro-bending loss bottleneck caused by the traditional protective layer "hard package soft" is broken. The corrugated structure elastically deforms when twisted under pressure, converting the linear pressure into tangential force and reducing the radial stress of the optical fiber by 90%; after the glass fiber is treated with silane, the surface energy reaches 72 mN / m, and the chemical bond + mechanical anchoring double combination is formed with the silicone rubber.

[0011] Further, the preparation method of the polyurethane-based oriented graphene film is as follows: C1: After mixing the modified polyurethane with the dispersant, add the solvent, add the graphene in three times, mix uniformly after each time, and finally add the aluminum nitride nanowire and the dispersant to disperse uniformly to obtain the slurry; C2: After pretreatment of the slurry by using a three-stage roller mill, vacuum degassing is performed; C3: After plasma treatment of the resin substrate, the vacuum-deaerated slurry is coated on the plasma-treated substrate; the wet film thickness is 50 μm; C4: The substrate coated with the slurry is subjected to electromagnetic orientation using a high-voltage direct-current directional electric field device; C5: After electromagnetic orientation, heat curing is performed, and a polyurethane-based oriented graphene film is obtained.

[0012] Further, in step C1, the modified polyurethane is thermoplastic polyurethane elastomer DP-9852, the dispersant is wet dispersant BYK-2155, the solvent is a mixed solvent of cyclohexanone and propylene glycol methyl ether in a volume ratio of 7:3, and the graphene is conductive graphene SE1232.

[0013] Further, the mass ratio of the modified polyurethane, the dispersant, the solvent, the graphene, the crosslinking agent and the heat-conducting synergist is 30:3:60:14:2:5.

[0014] Further, in step C2, the three-stage roller milling parameters are as follows: first-stage milling, the roller gap is set to 20 μm, the roller speed ratio is set to 1:3:9, the temperature control is 30℃, and the raw material passes through the roller gap for 3 times; Second-stage milling, the roller gap is set to 10 μm, the roller speed ratio is set to 1:4:12, the temperature control is 25℃, and the raw material passes through the roller gap for 3 times; Third-stage milling, the roller gap is set to 5 μm, the roller speed ratio is set to 1:5:15, the temperature control is 20℃, and the raw material passes through the roller gap for 3 times.

[0015] The present application also provides a production method of the above-mentioned environment-friendly flame-retardant fireproof intelligent cable, and the specific steps are as follows: S1: twist the copper wire to obtain a wire core, and obtain an insulated wire core by forming a ceramicized polyolefin layer and a crosslinked polyolefin layer on the surface of the wire core through double-layer co-extrusion; S2: after twisting the insulating wire core, the temperature measuring optical fiber and the local discharge optical fiber together, a temperature-resistant silicone rubber protective sleeve is sleeved to obtain a cable core; S3: the cable core, the condensate pipeline and the flame-retardant glass fiber rope are twisted into a cable and then wrapped with two layers of low-smoke halogen-free flame-retardant glass fiber tape; S4: a ceramicized fire-resistant silicone rubber layer with honeycomb holes is obtained by extruding a honeycomb mold outside the low-smoke halogen-free flame-retardant glass fiber tape, liquid metal capsules are added in the honeycomb holes, a polyurethane-based directional graphene film is coated, and a metal corrugated pipe is welded; The combination of the fire-resistant layer and the heat dissipation layer is realized, and the effects of heat dissipation and fire resistance are achieved; the liquid metal capsules can form a heat absorption-heat conduction composite circulation function, which can also reduce the volume of the cable and save costs; S5: a polyurethane protective layer is extruded outside the metal corrugated pipe; S6: two layers of galvanized steel belts are wrapped in the gap outside the polyurethane protective layer to form an armored layer; S7: a low-smoke halogen-free polyolefin protective layer is extruded outside the armored layer, the vibration optical fiber is filled in the middle of the low-smoke halogen-free polyolefin protective layer, and a polyurethane outer protective layer is extruded to complete the production of the entire cable.

[0016] The beneficial effects of the present application are: The structure adopted in the present application meets the functions of temperature measurement, local discharge measurement and vibration measurement in one; the temperature measuring optical fiber and the condensate pipeline are linked, when the operating temperature of the cable increases, the condensate pipeline can increase the water flow to improve the heat dissipation efficiency, improve the load capacity of the cable and prolong the service life of the cable. The data measured by the optical fiber can be transmitted to the measurement host in real time, reducing the risk coefficient of data loss leading to cable danger. Moreover, the time of the operation and maintenance personnel on site can be reduced, and the operation and maintenance cost can be reduced. The vibration optical fiber can timely detect abnormal vibration exceeding the set range around, and feedback the data to the operation and maintenance personnel in the first time, so that the sudden situation can be solved in time.

[0017] The cable meets the flame-retardant A level specified in GB / T19666, the fire resistance performance reaches above 1000 DEG C, and the normal working time is above 180 minutes, both the flame retardation and the fire resistance performance reach the upstream standard in the industry. In addition, all the materials used in the cable are environmentally friendly materials, and when a fire occurs, no toxic gas is released, the smoke concentration is very low, the visibility is high, and the harm to the environment and human body is small. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the cable of the present application; Wherein, 1, cable core, 101, copper wire conductor, 102, ceramic polyolefin layer, 103, crosslinked polyolefin layer, 104, temperature measuring optical fiber, 105, partial discharge measuring optical fiber, 106, temperature-resistant silicone rubber protective layer, 2, condensate pipeline, 3, flame-retardant layer, 301, flame-retardant glass fiber rope, 302, low-smoke halogen-free flame-retardant glass fiber tape, 4, fire-resistant layer, 401, ceramic fire-resistant silicone rubber layer, 402, polyurethane-based directional graphene film, 403, metal bellows, 5, polyurethane protective layer, 6, armored layer, 7, outer protective layer, 701, low-smoke halogen-free polyolefin protective layer, 702, shock optical fiber, 703, polyurethane outer protective layer. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application are described below to facilitate the understanding of the present application for those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, any changes within the spirit and scope of the present application defined and determined by the appended claims are obvious, and all the inventions utilizing the concept of the present application are within the scope of protection.

[0020] The raw materials used in the embodiments of the present application are shown in Table 1 as follows: Table 1

[0021] Embodiment The steps for preparing the environmentally friendly flame-retardant fireproof intelligent cable are as follows: S1: TU1 oxygen-free copper rod with a diameter of 8 mm is used, and the oxygen-free copper rod is continuously drawn and annealed by a 13-mode high-speed copper large-drawing continuous annealing unit to obtain a copper single wire with a diameter of 2.30 mm; a copper wire conductor 101 with a diameter of 20.5 mm is obtained by twisting a plurality of copper single wires; and an insulating wire core is obtained by obtaining a 1 mm ceramic polyolefin layer 102 and a 3 mm crosslinked polyolefin layer 103 on the surface of the copper wire conductor 101 by double-layer co-extrusion; S2: two temperature measuring optical fibers 104 and two partial discharge measuring optical fibers 105 are uniformly and intervaliy arranged around the insulating wire core, and a temperature-resistant silicone rubber is extruded on the outside to obtain a cable core 1; the thickness of the temperature-resistant silicone rubber protective layer 106 is 4 mm; S3: three cable cores 1, three condensate pipelines 2 and flame-retardant glass fiber ropes 301 are twisted to form a cable, the condensate pipeline 2 is in close contact with the cable core 1, and the diameter of the condensate pipeline 2 is 15 mm, and two layers of low-smoke halogen-free flame-retardant glass fiber tape 302 are further coated thereon; the low-smoke halogen-free flame-retardant glass fiber tape 302 is relatively thin in thickness, and the inner and outer sides of the two layers of low-smoke halogen-free flame-retardant glass fiber tape 302 are too close, so as to form a solid circular ring. Figure 1

[0022] ​S4: A ceramicized fire-resistant silicone rubber layer 401 with a honeycomb hole on the surface is obtained by extruding a honeycomb mold outside the low-smoke halogen-free flame-retardant glass fiber tape 302, and the thickness is 4 mm. After adding a liquid metal capsule in the honeycomb hole, a polyurethane-based directional graphene film 402 is coated, and then a metal corrugated pipe 403 is welded by argon arc welding; the metal corrugated pipe 403 is selected from an aluminum corrugated pipe; the liquid metal capsule is a PUF coating layer, and the center is coated with an EGaIn PUF microcapsule containing eutectic gallium-indium alloy EGaIn; S5: A 2.0 mm polyurethane protective layer 5 is extruded outside the aluminum corrugated pipe; S6: Two layers of galvanized steel tapes are gap-wrapped outside the polyurethane protective layer 5 to form an armored layer 6; the thickness of the galvanized steel tape is 0.5 mm, and the gap rate is 45-50%; S7: A 5 mm low-smoke halogen-free polyolefin protective layer 701 is extruded outside the armored layer 6, four vibration optical fibers 702 are filled in the middle of the low-smoke halogen-free polyolefin protective layer 701, the four vibration optical fibers 702 are uniformly and spacedly arranged, and then a 3 mm polyurethane outer protective layer 703 is extruded to obtain an environmentally friendly flame-retardant fireproof intelligent cable as shown in Figure 1

[0023] The preparation method of the liquid metal capsule EGaIn PUF is as follows: A1: 10 g of liquid metal eutectic gallium-indium alloy EGaIn and 0.5 g of sodium dodecyl sulfate SDS are weighed and added to 100 mL of deionized water, and sheared and emulsified at 8000 rpm for 10 min to form a liquid metal emulsion with a particle size of 5-20 μm; A2: 5 g of polyurethane prepolymer is slowly added to the liquid metal emulsion at 40°C, the pH is adjusted to 3.5, and the reaction is carried out for 2 h; a polyurea-formaldehyde coating layer with a thickness of 200-500 nm is formed; A3: After centrifugation, deionized water and ethanol are used for washing in sequence for three times, and vacuum drying is carried out at 60°C for 12 h to obtain the liquid metal capsule (yield > 85%, coating rate 92%).

[0024] The same corrugated weaving-gradient bonding structure is used outside the fiber cores of the temperature measuring optical fiber 104, the local discharge optical fiber 105 and the vibration optical fiber 702, and the preparation method of the corrugated weaving-gradient bonding structure is as follows: B1: Glass yarn is immersed in a KH550-ethanol solution at 3 g / mL to obtain a preformed material; the KH550-ethanol solution is prepared by using KH550, ethanol and water, wherein the amount ratio of KH550 to ethanol is 1 g:10-15 mL, and the total solute volume concentration in the KH550-ethanol solution is 3%; ​B2: The preformed material is placed in a corrugated mold, and after hot forming at 280℃ for 5s, the corrugated glass fiber web is obtained by irradiating with ultraviolet light at 3000mJ / cm2 at a wavelength of 365nm; B3: The corrugated glass fiber web is heated to 80℃, and a silane atomized liquid with a particle size of 10μm is uniformly sprayed on the surface, and a temperature-resistant silicone rubber protective sleeve is immediately wrapped to complete the preparation of the corrugated woven-gradient bonding structure. The instantaneous temperature resistance of the temperature-resistant silicone rubber protective sleeve is 316℃ (30min); the flame retardant grade is UL94V-0; and the Shore hardness is 50±5 Shore A.

[0025] The preparation method of the polyurethane-based directional coated graphene film 402 used in step S4 is as follows: C1: 15g modified polyurethane (DP-9852) is mixed with 1.5g dispersant (BYK-2155) and then added to 30g cyclohexanone and propylene glycol methyl ether mixed solvents in a volume ratio of 7:3, 7g graphene (SE1232) is added in three times, each time after mixing evenly, then add 2.5g aluminum nitride nanowire, stir at 400rpm for 5-10 minutes, slowly add 1g isocyanate HDI trimer (purchased from BASF) during stirring, the viscosity of the slurry is 9000±500mPa·s; The dispersion device uses a high-speed planetary mixer, the rotation speed is set to 2000rpm×5min+400rpm×2min (revolution / rotation), and the temperature control is ≤25℃ (water-cooled jacket); C2: After the slurry is pretreated by a three-stage roller mill, vacuum degassing is performed; The vacuum degassing uses a planetary dynamic mixer, the setting time is 25 minutes, during 0~5 minutes, the vacuum degree (kPa) is set to normal pressure, and the stirring speed (rpm) is set to 30; during 5~15 minutes, the vacuum degree is set to 98, and the stirring speed is 10; during 15~25 minutes, the vacuum degree is set to 101, and the stirring speed is 5. The slurry has no visible bubbles, and the density deviation is ≤0.5%, which means that the vacuum degassing is completed; The three-stage roller milling parameters are as follows: first-stage milling, the roller gap is set to 20μm, the roller speed ratio is set to 1∶3∶9, the temperature control is 30℃, and the raw material passes through the roller gap for 3 times; Second-stage milling, the roller gap is set to 10μm, the roller speed ratio is set to 1∶4∶12, the temperature control is 25℃, and the raw material passes through the roller gap for 3 times; Third-stage milling, the roller gap is set to 5μm, the roller speed ratio is set to 1∶5∶15, the temperature control is 20℃, and the raw material passes through the roller gap for 3 times; C3: The modified polyurethane (Kosyo DP-9852) was used as the resin base material, and the mass ratio of the resin base material to the modified polyurethane used in the preparation of the slurry was 46:30; the resin base material was subjected to plasma treatment, an atmospheric plasma generating device was used, and the parameters were set as follows: working gas (Ar / O2=4:1), nozzle distance 8 mm, and moving speed 0.8 m / min; the vacuum-deaerated slurry was coated on the base material subjected to plasma treatment, a high-precision micro-gravure coater was used, and the parameters were set as follows: screen roll line number 180 lines / inch; doctor blade angle 35°; coating speed 15 m / min; wet film thickness 50 μm; and tension control 20 N±0.5 N.

[0026] C4: The base material coated with the slurry was subjected to electromagnetic orientation using a high-voltage direct-current directional electric field device; the electromagnetic orientation was performed using a high-voltage direct-current directional electric field device, and the electric field strength was set to 10 kV / cm; the action time was 30±1 s, which was controlled by a servo motor to make the base material stay; and the temperature environment was 25°C constant temperature and RH<40%.

[0027] C5: After the electromagnetic orientation, thermal curing was performed, and a polyurethane-based oriented graphene film 402 was obtained.

[0028] The thermal curing was performed using an infrared hot air combined oven (3-temperature zones), the temperature in zone 1 was set to 60±2°C, the time was 10 min, the temperature in zone 2 was set to 80±1°C, the time was 20 min, and the temperature in zone 3 was set to 110±2°C, and the time was 5 min.

[0029] The prepared cable was subjected to fire resistance test, the cable was subjected to 1000°C flame test by a torch + standard flame furnace, the temperature of the core was detected by a temperature measuring optical fiber 104 during the test, and the test results were as follows: the resistance time was 240 min, the time for the core to reach 350°C was 225 min, and the backfire surface temperature rise was ≤180°C; after the test, the cable was cut to be observed, and the structures of the ceramicized polyolefin layer 102 and the ceramicized fire-resistant silicone rubber layer 401 were both 100% complete.

[0030] A comparative example was set: the ceramicized fire-resistant silicone rubber layer 401 was replaced by polyurethane with the same thickness, and the rest was unchanged; the comparative example cable was subjected to 750°C flame test by a standard flame furnace, and the test results were as follows: the resistance time was 180 min, the time for the core to reach 350°C was 151 min, and the backfire surface temperature rise was ≤540°C; after the test, the ceramicized polyolefin layer 102 was found to have a completeness rate of about 30% after cutting.

[0031] The prepared cable is subjected to load capacity test according to GB / T12706 standard, and the test result is that the cable prepared in the embodiment has a cross-sectional area of 240 mm2 and can effectively load 1600 A (temperature rise ≤ 50 K), while the limit load of the cable with the same cross-sectional area is 1200 A (temperature rise 70 K), and the load capacity of the cable prepared in the embodiment is increased by 33% compared with the existing cable.

[0032] The prepared cable is subjected to vertical combustion test according to UL1685 standard, and the test result is that the cable of the embodiment has a flame spread of 0.8 m, a smoke concentration of 12%, and a light transmittance (ISO 5659-2) of 82%; while the traditional cable has a flame spread length of 2.5 m, a smoke concentration of 28%, and a light transmittance (ISO 5659-2) of 20%; the flame-retardant efficiency of the cable prepared by the scheme of the application is increased by 300%.

[0033] The cable of the application realizes multi-parameter linkage analysis, accurately identifies external damage or insulation failure, and dynamically responds to heat dissipation through the setting of the temperature measuring optical fiber 104, the partial discharge optical fiber 105 and the vibration optical fiber 702. Specifically, the water flow in the condenser water pipe 2 is adjusted according to the temperature measured by the temperature measuring optical fiber 104. When the temperature detected by the temperature measuring optical fiber 104 is greater than or equal to 50℃ and less than 70℃, the water in the condenser water pipe 2 is made to flow by the connected water circulation device, and the water flow rate is 3L / min; when the temperature detected by the temperature measuring optical fiber 104 is greater than 70℃, the water flow rate is adjusted to 5L / min; the heat dissipation response test is carried out according to IEC60287 standard, and the test result is that the temperature is reduced to 55℃ within 5 minutes from the start of the condenser water acceleration mode at 70℃; while the traditional air cooling scheme only reduces to 65℃.

[0034] Load heat dissipation test is also carried out. Under the condition of 1000A load test, the cable of the embodiment realizes a heat dissipation efficiency of 1.8kW / m·℃ through the setting of condenser water + graphene hollow layer, while the heat dissipation efficiency of the traditional cable and the air cooling scheme is only 0.5kW / m·℃ under the condition of 1000A load.

[0035] As can be seen from the above, the environmentally friendly flame-retardant fireproof intelligent cable prepared by the application can realize material recycling after being subjected to flame invasion, and the fire smoke toxicity is close to zero, the whole life cycle cost is reduced by more than 40%, and is suitable for high-value scenes such as nuclear power and high-speed rail; reaches the flame-retardant A level specified in GB / T19666, the fire resistance is above 1000℃, the normal working time is above 180 min, and the flame retardance and fire resistance both reach the upstream standard of the industry. When the operating temperature of the cable rises, the condenser water pipe 2 can increase the water flow to improve the heat dissipation efficiency, improve the load capacity of the cable, and prolong the service life of the cable.

Claims

1. An environmentally friendly flame-retardant fireproof intelligent cable, characterized in that, The cable comprises, from inside to outside, a cable core part, a flame-retardant layer (3), a fire-resistant layer (4), a polyurethane protective layer (5), an armored layer (6) and an outer protective layer (7); The cable core part comprises a plurality of cable cores (1); the flame-retardant layer (3) comprises a low-smoke halogen-free flame-retardant glass fiber tape (302) covering the cable core part, and the low-smoke halogen-free flame-retardant glass fiber tape (302) is filled with a flame-retardant glass fiber rope (301) between the cable core part; The fire-resistant layer (4) comprises, from inside to outside, a ceramicized fire-resistant silicone rubber layer (401), a polyurethane-based oriented graphene film (402) and a metal bellows (403); and a plurality of cavities are arranged between the ceramicized fire-resistant silicone rubber layer (401) and the polyurethane-based oriented graphene film (402), and a liquid metal capsule is arranged in the cavities; The preparation method of the liquid metal capsule is as follows: A1: adding liquid metal eutectic gallium-indium alloy EGaIn and sodium dodecyl sulfate SDS into deionized water, and shearing and emulsifying to obtain a liquid metal emulsion with a particle size of 5-20 μm; A2: adding a polyurethane prepolymer into the liquid metal emulsion, adjusting the pH to 3.5, and reacting for 2 h; A3: after centrifugation, washing and vacuum drying, the liquid metal capsule is obtained.

2. The environment-friendly flame-retardant fireproof intelligent cable according to claim 1, characterized in that, The cable core (1) comprises, from inside to outside, a copper wire conductor (101), a ceramicized polyolefin layer (102), a crosslinked polyolefin layer (103) and a temperature-resistant silicone rubber protective layer (106), and a temperature measurement optical fiber (104) and a partial discharge measurement optical fiber (105) are further embedded in the temperature-resistant silicone rubber protective layer (106).

3. The environment-friendly flame-retardant fireproof intelligent cable according to claim 2, characterized in that, A condensate water pipeline (2) is further arranged between the low-smoke halogen-free flame-retardant glass fiber tape (302) and the cable core part, and the cable core part is obtained by twisting three cable cores (1), three condensate water pipelines (2) and the flame-retardant glass fiber rope (301); the three cable cores (1) are located at the center of the cable core part, and the three condensate water pipelines (2) are uniformly arranged in a circle outside the three cable cores (1).

4. The environmentally friendly flame-retardant fireproof intelligent cable according to claim 3, characterized in that, The outer protective layer (7) comprises, from inside to outside, a low-smoke halogen-free polyolefin protective layer (701) and a polyurethane outer protective layer (703), and a vibration optical fiber (702) is embedded in the low-smoke halogen-free polyolefin protective layer (701).

5. The environment-friendly flame-retardant fireproof intelligent cable according to claim 4, characterized in that, The same corrugated woven-gradient bonding structure is adopted outside the fiber core of the temperature measurement optical fiber (104), the partial discharge measurement optical fiber (105) and the vibration optical fiber (702), and the preparation method of the corrugated woven-gradient bonding structure is as follows: B1: glass yarn is immersed in a KH550-ethanol solution at 3 g / mL to obtain a preformed material; the KH550-ethanol solution is prepared by using KH550, ethanol and water, wherein the amount ratio of KH550 to ethanol is 1 g:10-15 mL, and the total solute volume concentration in the KH550-ethanol solution is 3%; B2: the preformed material is placed in a corrugated mold, hot formed at 280℃ for 5 s, and then irradiated with ultraviolet light at a wavelength of 365 nm and an intensity of 3000 mJ / cm2 to obtain a corrugated glass fiber web. B3: corrugated glass fiber net is heated to 80℃, the surface is uniformly sprayed with KH550 silane atomized liquid with particle size of 10 μm, and a temperature-resistant silicone rubber protective sleeve is immediately coated to complete preparation of the corrugated weaving-gradient bonding structure.

6. The environment-friendly flame-retardant fireproof intelligent cable according to claim 5, characterized in that, The preparation method of the polyurethane-based oriented graphene film (402) is as follows: C1: the modified polyurethane is mixed with a dispersant, then solvent is added, graphene is added three times, each time after mixing evenly, then added, finally, aluminum nitride nanowires and a dispersant are added and dispersed evenly to obtain a slurry; C2: the slurry is ground by a three-stage roller grinder for pretreatment, and then vacuum degassing is performed; C3: after plasma treatment of the resin substrate, the vacuum-deaerated slurry is coated on the plasma-treated substrate; the wet film thickness is 50 μm; C4: the substrate coated with the slurry is subjected to electromagnetic orientation using a high-voltage direct-current oriented electric field device; C5: after electromagnetic orientation, heat curing is performed, and a polyurethane-based oriented graphene film (402) is obtained.

7. The environment-friendly flame-retardant fireproof intelligent cable according to claim 6, characterized in that, In step C1, the modified polyurethane is thermoplastic polyurethane elastomer DP-9852, the dispersant is wet dispersant BYK-2155, the solvent is a mixed solvent of cyclohexanone and propylene glycol methyl ether in a volume ratio of 7:3, and the graphene is conductive graphene SE1232.

8. The environment-friendly flame-retardant fireproof intelligent cable according to claim 7, characterized in that, The mass ratio of the modified polyurethane, the dispersant, the solvent, the graphene, the crosslinking agent, and the heat-conducting synergist is 30:3:60:14:2:

5.

9. The environmentally friendly flame-retardant fireproof intelligent cable according to claim 8, characterized in that, In step C2, the three-stage roller grinding parameters are as follows: first-stage grinding, roller gap is set to 20 μm, roller speed ratio is set to 1:3:9, temperature control is 30℃, and the raw material passes through the roller gap for 3 times; second-stage grinding, roller gap is set to 10 μm, roller speed ratio is set to 1:4:12, temperature control is 25℃, and the raw material passes through the roller gap for 3 times; third-stage grinding, roller gap is set to 5 μm, roller speed ratio is set to 1:5:15, temperature control is 20℃, and the raw material passes through the roller gap for 3 times.

10. A method for producing the environmentally friendly flame-retardant fireproof intelligent cable according to any one of claims 1-9, characterized in that, The specific steps are as follows: S1: a copper wire is twisted to obtain a core, a ceramicized polyolefin layer (102) and a crosslinked polyolefin layer (103) are obtained on the surface of the core by double-layer co-extrusion to obtain an insulated core; S2: the insulated core, a temperature measurement optical fiber (104), and a local discharge optical fiber (105) are twisted together, and a temperature-resistant silicone rubber protective sleeve is sleeved to obtain a cable core (1); S3: the cable core (1), a condensate pipeline (2), and a flame-retardant glass fiber rope (301) are twisted and then wrapped with two layers of low-smoke halogen-free flame-retardant glass fiber tape (302); S4: a ceramicized fire-resistant silicone rubber layer (401) with honeycomb holes is obtained by extrusion on the low-smoke halogen-free flame-retardant glass fiber tape (302) using a honeycomb mold, liquid metal capsules are added in the honeycomb holes, a polyurethane-based oriented graphene film (402) is coated, and a metal corrugated pipe (403) is welded; S5: a polyurethane protective layer (5) is extruded on the metal corrugated pipe (403); S6: two layers of galvanized steel belts are gap-wrapped on the polyurethane protective layer (5) to form an armored layer (6); S7: A low-smoke halogen-free polyolefin protective layer is extruded outside the armor layer (6), the vibration optical fiber (702) is filled in the middle of the low-smoke halogen-free polyolefin protective layer, and a polyurethane outer protective layer (703) is extruded, that is, the production of the whole cable is completed.

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