Environment-friendly flame-retardant halogen-free polypropylene cable

Abstract

The invention belongs to the technical field of cable materials, and particularly relates to an environment-friendly flame-retardant halogen-free polypropylene cable. The environment-friendly flame-retardant halogen-free polypropylene cable comprises a plurality of wire cores, and a binding tape, an isolation sleeve, a fireproof layer, an armor layer and a sheath layer which are sequentially arranged from the wire cores from inside to outside, and each wire core sequentially comprises a metal shield, an insulation shield, an insulation layer, a conductor shield and a conductor from outside to inside; the insulation shielding layer, the insulation layer and the conductor shielding layer are extruded on the conductor, the metal shielding layer is lapped on the insulation shielding layer to obtain wire cores, then the obtained wire cores are twisted together, gaps of the wire cores are filled and lapped with the binding tape, then the isolation sleeve and the fireproof layer are extruded in sequence, the armor layer is lapped, and finally the sheath layer is extruded. The environment-friendly flame-retardant halogen-free polypropylene cable is obtained by taking a ceramic polyolefin fire-resistant material as a fire-resistant layer, taking a thermoplastic polypropylene shielding material as a conductor shield and an insulation shield and taking a thermoplastic polypropylene insulation material as an insulation layer.

Description

Technical Field

[0001] This invention belongs to the field of cable material technology, specifically relating to an environmentally friendly flame-retardant halogen-free polypropylene cable. Background Technology

[0002] With the rapid development of modernization and technology, wires and cables have evolved from simple telephone and telegraph cables to multi-pair cables, coaxial cables, optical cables, data cables, and even composite communication cables. They are widely used in densely populated areas such as high-rise buildings, hospitals, train stations, airports, subways, rail transit, shipbuilding, hotels, large supermarkets, public entertainment venues, and public transportation facilities, placing higher demands on the safety of wires and cables. To cope with fire situations, cables are typically required to have excellent fire resistance and flame retardant properties to protect the circuit from short circuits and open circuits, ensuring uninterrupted power supply for fire-fighting lighting and facilities, maximizing time for fire rescue, and minimizing the risk of death and property damage from inhaling toxic gases.

[0003] The insulation temperature resistance of existing wires and cables needs improvement. Commonly used cross-linked polyethylene (XLPE) is not recyclable, resulting in the inability to effectively reuse waste generated during production and use. This not only wastes resources but also has adverse environmental impacts. In the event of a fire, conventionally structured cables cannot guarantee normal operation, easily releasing toxic gases, hindering personnel escape and fire rescue efforts, and endangering personal safety. This raises the issue of how to dispose of cross-linked cables at the end of their product lifespan. How to effectively address the environmentally friendly treatment of these cables at the end of their product lifespan, reduce energy consumption during production, and achieve green and environmentally friendly practices has a significant impact on the development of the wire and cable industry. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing an environmentally friendly flame-retardant halogen-free polypropylene cable. This cable has a high temperature resistance rating, a large current carrying capacity, and good flame-retardant properties. The smoke emitted after ignition is non-toxic, and it can be recycled, thus showing promising application prospects.

[0005] The environmentally friendly flame-retardant halogen-free polypropylene cable of the present invention includes multiple cores and, from the cores outwards, a binding tape, an isolation sleeve, a fire-resistant layer, an armor layer, and a sheath layer. The cores, from the outside inwards, include a metal shield, an insulating shield, an insulating layer, a conductor shield, and a conductor. The insulating shield, insulating layer, and conductor shield are extruded onto the conductor, and the metal shield is wrapped around the insulating shield to obtain the cores. The resulting cores are then twisted together, the gaps between the cores are filled, and binding tape is wrapped around them. Then, an isolation sleeve and a fire-resistant layer are extruded in sequence, an armor layer is wrapped around them, and finally, a sheath layer is extruded.

[0006] Preferably, the binding tape is made of highly flame-retardant glass cloth tape.

[0007] Preferably, flame-retardant PP filler rope is used to fill the space between the wire core and the binding strap.

[0008] As a preferred option, the isolation sleeve is made of low-smoke, halogen-free, flame-retardant, and oxygen-barrier material.

[0009] Furthermore, the refractory layer uses ceramicized polyolefin refractory material.

[0010] The longer the erosion time of ceramicized polyolefin refractories, the higher the temperature and the harder the shell, resulting in better fire and heat insulation effects. The maximum temperature can reach over 3000℃, and the flame retardant performance meets Class A requirements. The refractory layer uses ceramicized polyolefin refractories, which are easy to produce using ordinary extruders, making operation simple and quality control easy. In a fire, the refractory layer is fired into a hard, ceramic-like protective layer, preventing the continuous and excessive heat from the flames from entering the cable core. This protects the cable core from short circuits and open circuits, ensuring the line can operate normally for a certain period. After a fire, it ensures power supply for fire-fighting lighting and facilities, maximizing time for fire rescue and significantly improving safety.

[0011] Furthermore, the ceramicized polyolefin refractory is obtained by mixing 80-100 parts of ethylene-vinyl acetate copolymer, 40-60 parts of ceramicized powder, 10-20 parts of flame retardant, and 5-10 parts of kaolin gel.

[0012] Preferably, the ceramic powder is pretreated with 0.1 to 2.0% of its mass of a silane coupling agent.

[0013] Preferably, the silane coupling agent includes, but is not limited to, one or more of methacryloxysilane, vinylsilane, and epoxysilane coupling agents.

[0014] Preferably, the ceramic powder includes, but is not limited to, one or more of the following: talc, mica, borosilicate, calcium borosilicate, calcite, limestone, and clay.

[0015] Furthermore, the flame retardant is a mixture of organic and inorganic flame retardants in a mass ratio of 6~8:2~4.

[0016] Preferably, the organic flame retardant is any one of phosphorus-based or nitrogen-based flame retardants; the inorganic flame retardant includes, but is not limited to, one or more of antimony trioxide, magnesium hydroxide, aluminum hydroxide, and boron compounds.

[0017] Furthermore, an isolation strip can be installed between the armor layer and the sheath layer.

[0018] As a preferred option, the sheath layer is made of halogen-free flame-retardant polyolefin sheath material, the armor layer is a steel strip armor layer, and the isolation strip is a high flame-retardant glass cloth strip.

[0019] Furthermore, the metal shielding uses copper strips.

[0020] Furthermore, the conductor shielding and insulation shielding are made of thermoplastic polypropylene shielding material.

[0021] Furthermore, the thermoplastic polypropylene shielding material is obtained by mixing 40-60 parts of polypropylene, 30-50 parts of POE elastomer, 10-20 parts of carbon nanotubes, 1.0-2.0 parts of lubricant and 0.1-0.5 parts of antioxidant.

[0022] Preferably, the lubricant includes, but is not limited to, one or more of stearamide, oleamide, fatty acids, methyl silicone oil, liquid paraffin, and oxidized polyethylene.

[0023] Preferably, the antioxidants include, but are not limited to, one or more of antioxidant 1010, antioxidant 168, antioxidant 2264, antioxidant 264, antioxidant DLTP, and antioxidant ODP.

[0024] Furthermore, the insulation layer is made of thermoplastic polypropylene insulation material.

[0025] Thermoplastic polypropylene insulation material possesses excellent electrical insulation properties and chemical stability, with a temperature resistance rating of 105~110℃, making it suitable for high-temperature environments. It maintains a high current-carrying capacity even at high temperatures. Furthermore, the material is recyclable, aligning with environmental protection principles. The insulation layer, made of thermoplastic polypropylene, can be continuously extruded without the need for high-temperature vulcanization cross-linking, eliminating issues such as scorched clinker, chemical reactions, and zero gas emissions, exhibiting significant energy-saving, emission-reducing, and environmentally friendly characteristics.

[0026] Furthermore, the thermoplastic polypropylene insulation material is obtained by mixing 40-60 parts of polypropylene, 30-50 parts of POE elastomer, 1.0-5.0 parts of inorganic filler, and 0.1-1.0 parts of antioxidant.

[0027] Preferably, the conductor includes, but is not limited to, one or more of stranded copper, single copper, pre-stranded and then plated copper, and copper-clad aluminum.

[0028] Furthermore, a semi-conductive nylon tape can be wrapped around the conductor to make the interface between the conductor shield and the conductor smooth.

[0029] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: (1) The present invention uses ceramicized polyolefin refractory material as refractory layer, thermoplastic polypropylene shielding material as conductor shielding and insulation shielding, thermoplastic polypropylene insulation material as insulation layer, low smoke halogen-free flame retardant isolation material as isolation sleeve, and halogen-free flame retardant polyolefin sheath material as sheath layer to obtain an environmentally friendly flame retardant halogen-free polypropylene cable. (2) The fire-resistant layer is made of ceramicized polyolefin refractory material. When a fire occurs, it can be fired into a hard protective layer in the form of ceramic to prevent the heat of the flame from being continuously and extensively conducted into the cable core. This can protect the cable core from short circuits and open circuits, and ensure that the line can work normally for a certain period of time, greatly improving safety. (3) The insulation layer is made of thermoplastic polypropylene insulation material, which can be continuously extruded without high-temperature vulcanization crosslinking. It can still maintain a high current carrying capacity at high temperature, without problems such as scorched clinker, no chemical reaction, zero gas emission, and has obvious energy-saving, consumption-reducing and environmental protection characteristics. (4) The environmentally friendly flame-retardant halogen-free polypropylene cable has a high temperature resistance rating, a large current carrying capacity and good flame retardant performance. The smoke after ignition is non-toxic and can be recycled. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the environmentally friendly flame-retardant halogen-free polypropylene cable of Example 1; In the diagram: 1-Sheath layer, 2-Isolation strip, 3-Armor layer, 4-Fire-resistant layer, 5-Isolation sleeve, 6-Binding strap, 7-Flame-retardant PP filler rope, 8-Metal shield, 9-Insulating shield, 10-Insulating layer, 11-Conductor shield, 12-Conductor, 13-Wrapped semi-conductive nylon tape. Detailed Implementation

[0031] The technical solution of the present invention will be further described and illustrated below with reference to specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of helping to understand the present invention and are not intended to limit the specific scope of the present invention. Furthermore, the accompanying drawings used herein are merely for better illustrating the content disclosed in the present invention and do not limit the scope of protection. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commonly used in the art, and the methods used in the embodiments are all conventional methods in the art.

[0032] In the preparation of the environmentally friendly flame-retardant halogen-free polypropylene cable of the present invention, the conductor shield 11, the insulation layer 10 and the insulation shield 9 are first extruded on the conductor 12 by a three-layer co-extrusion equipment. Then, the metal shield 8 is formed by wrapping the metal copper strip by a shielding machine. Then, multiple copper shield cores are twisted together by a cabling machine. In order to ensure the roundness of the cable core, the gaps between the cores are filled with flame-retardant PP filling rope 7 and tied with binding tape 6. Then, the isolation sleeve 5 and the fire-resistant layer 4 are extruded in sequence by an extruder. The armor layer 4 is wrapped by an armoring machine. Finally, the sheath layer 1 is extruded by an extruder.

[0033] In the following examples and comparative examples, the isolation sleeve 5 uses CAB-5504, a low-smoke halogen-free, high flame-retardant polyolefin oxygen barrier material provided by Shanghai Kaibo Cable Special Materials Co., Ltd. The sheath layer 1 uses WM1907, a halogen-free flame-retardant polyolefin sheath material from Zhejiang Wanma Polymer Materials Group Co., Ltd.

[0034] Example 1

[0035] In this embodiment, the environmentally friendly flame-retardant halogen-free polypropylene cable includes three cores and, from the cores outwards, a binding strap 6, an isolation sleeve 5, a fire-resistant layer 4, an armor layer 3, an isolation strip 2, and a sheath layer 1. The binding strap 6 is a high flame-retardant glass cloth tape, the isolation strip 2 is a high flame-retardant glass cloth tape, the armor layer 3 is a steel tape armor layer, and flame-retardant PP filler rope 7 is filled between the cores and the binding strap 6. The ceramicized polyolefin refractory material used in refractory layer 4 is prepared by mixing 85 parts of ethylene-vinyl acetate copolymer, 50 parts of talc powder, 10 parts of tris(2,3-dibromopropyl) phosphate, 5 parts of antimony trioxide, and 6 parts of kaolin gel. The talc powder is premixed with 0.5% of its mass of silane coupling agent KH570. The wire core consists of, from the outside to the inside, a metal shield 8, an insulating shield 9, an insulating layer 10, a conductor shield 11, and a conductor 13. The conductor 13 is surrounded by a semi-conductive nylon tape 12. The metal shield is made of copper tape. The insulating layer 10 is made of thermoplastic polypropylene insulation material composed of 50 parts polypropylene, 40 parts POE elastomer, 2.0 parts silica, and 0.5 parts antioxidant 1010. The conductor shield 11 and the insulating shield 9 are made of thermoplastic polypropylene shield material composed of 50 parts polypropylene, 40 parts POE elastomer, 10 parts carbon nanotubes, 1.0 part oxidized polyethylene, and 0.2 parts antioxidant 1010.

[0036] Example 2

[0037] In this embodiment, the environmentally friendly flame-retardant halogen-free polypropylene cable includes four wire cores and, from the wire cores, a binding strap 6, an isolation sleeve 5, a fire-resistant layer 4, an armor layer 3, an isolation strip 2, and a sheath layer 1 arranged sequentially from the inside out. The binding strap 6 is a high flame-retardant glass cloth tape, the isolation strip 2 is a high flame-retardant glass cloth tape, the armor layer 3 is a steel tape armor layer, and flame-retardant PP filler rope 7 is filled between the wire cores and the binding strap 6. The ceramicized polyolefin refractory material used in refractory layer 4 is prepared by mixing 90 parts of ethylene-vinyl acetate copolymer, 45 parts of talc powder, 10 parts of tris(2,3-dibromopropyl) phosphate, 5 parts of antimony trioxide, and 6 parts of kaolin gel. The talc powder is premixed with 0.5% of its mass of silane coupling agent KH570. The wire core consists of, from the outside to the inside, a metal shield 8, an insulating shield 9, an insulating layer 10, a conductor shield 11, and a conductor 13. The metal shield is made of copper tape. The insulating layer 10 is made of thermoplastic polypropylene insulation material composed of 45 parts polypropylene, 45 parts POE elastomer, 2.0 parts silica, and 0.5 parts antioxidant 1010. The conductor shield 11 and the insulating shield 9 are made of thermoplastic polypropylene shield material composed of 55 parts polypropylene, 45 parts POE elastomer, 12 parts carbon nanotubes, 1.5 parts oxidized polyethylene, and 0.3 parts antioxidant 1010.

[0038] Example 3

[0039] In this embodiment, the environmentally friendly flame-retardant halogen-free polypropylene cable includes three wire cores and, from the wire cores, a binding strap 6, an isolation sleeve 5, a fire-resistant layer 4, an armor layer 3, and a sheath layer 1 arranged sequentially from the inside out. The binding strap 6 is a high flame-retardant glass cloth tape, the armor layer 3 is a steel tape armor layer, and a flame-retardant PP filler rope 7 is filled between the wire cores and the binding strap 6. The ceramicized polyolefin refractory material used in refractory layer 4 is prepared by mixing 85 parts of ethylene-vinyl acetate copolymer, 50 parts of mica powder, 12 parts of tris(2,3-dibromopropyl) phosphate, 4 parts of antimony trioxide, and 6 parts of kaolin gel. The mica powder is premixed with 0.5% of its mass of silane coupling agent KH570. The wire core consists of, from the outside to the inside, a metal shield 8, an insulating shield 9, an insulating layer 10, a conductor shield 11, and a conductor 13. The conductor 13 is surrounded by a semi-conductive nylon tape 12. The metal shield is made of copper tape. The insulating layer 10 is made of thermoplastic polypropylene insulation material composed of 45 parts polypropylene, 50 parts POE elastomer, 2.0 parts silica, and 0.5 parts antioxidant 1010. The conductor shield 11 and the insulating shield 9 are made of thermoplastic polypropylene shield material composed of 50 parts polypropylene, 45 parts POE elastomer, 12 parts carbon nanotubes, 1.2 parts oxidized polyethylene, and 0.2 parts antioxidant 1010.

[0040] Example 4

[0041] In this embodiment, the environmentally friendly flame-retardant halogen-free polypropylene cable includes three cores and, from the cores outwards, a binding strap 6, an isolation sleeve 5, a fire-resistant layer 4, an armor layer 3, an isolation strip 2, and a sheath layer 1. The binding strap 6 is a high flame-retardant glass cloth tape, the isolation strip 2 is a high flame-retardant glass cloth tape, the armor layer 3 is a steel tape armor layer, and flame-retardant PP filler rope 7 is filled between the cores and the binding strap 6. The ceramicized polyolefin refractory material used in refractory layer 4 is prepared by mixing 85 parts of ethylene-vinyl acetate copolymer, 50 parts of talc powder, 15 parts of tris(2,3-dibromopropyl) phosphate and 6 parts of kaolin gel. The talc powder is premixed with 0.5% of its mass of silane coupling agent KH570. The wire core consists of, from the outside to the inside, a metal shield 8, an insulating shield 9, an insulating layer 10, a conductor shield 11, and a conductor 13. The conductor 13 is surrounded by a semi-conductive nylon tape 12. The metal shield is made of copper tape. The insulating layer 10 is made of thermoplastic polypropylene insulation material composed of 50 parts polypropylene, 40 parts POE elastomer, 2.0 parts silica, and 0.5 parts antioxidant 1010. The conductor shield 11 and the insulating shield 9 are made of thermoplastic polypropylene shield material composed of 50 parts polypropylene, 40 parts POE elastomer, 10 parts carbon nanotubes, 1.0 part oxidized polyethylene, and 0.2 parts antioxidant 1010.

[0042] Example 5

[0043] In this embodiment, the environmentally friendly flame-retardant halogen-free polypropylene cable includes three cores and, from the cores outwards, a binding strap 6, an isolation sleeve 5, a fire-resistant layer 4, an armor layer 3, an isolation strip 2, and a sheath layer 1. The binding strap 6 is a high flame-retardant glass cloth tape, the isolation strip 2 is a high flame-retardant glass cloth tape, the armor layer 3 is a steel tape armor layer, and flame-retardant PP filler rope 7 is filled between the cores and the binding strap 6. The ceramicized polyolefin refractory material used in refractory layer 4 is prepared by mixing 85 parts of ethylene-vinyl acetate copolymer, 50 parts of talc powder, 15 parts of antimony trioxide and 6 parts of kaolin gel. The talc powder is premixed with 0.5% of its mass of silane coupling agent KH570. The wire core consists of, from the outside to the inside, a metal shield 8, an insulating shield 9, an insulating layer 10, a conductor shield 11, and a conductor 13. The conductor 13 is surrounded by a semi-conductive nylon tape 12. The metal shield is made of copper tape. The insulating layer 10 is made of thermoplastic polypropylene insulation material composed of 50 parts polypropylene, 40 parts POE elastomer, 2.0 parts silica, and 0.5 parts antioxidant 1010. The conductor shield 11 and the insulating shield 9 are made of thermoplastic polypropylene shield material composed of 50 parts polypropylene, 40 parts POE elastomer, 10 parts carbon nanotubes, 1.0 part oxidized polyethylene, and 0.2 parts antioxidant 1010.

[0044] Comparative Example 1 This comparative environmentally friendly flame-retardant halogen-free polypropylene cable includes three cores and, from the cores outwards, a binding strap 6, an isolation sleeve 5, a fire-resistant layer 4, an armor layer 3, an isolation strip 2, and a sheath layer 1. The binding strap 6 is made of high flame-retardant glass cloth tape, the isolation strip 2 is made of high flame-retardant glass cloth tape, the armor layer 3 is made of steel tape armor, and flame-retardant PP filler rope 7 is filled between the cores and the binding strap 6. The refractory layer 4 is made of polyolefin refractory material, which is prepared by mixing 85 parts of ethylene-vinyl acetate copolymer, 10 parts of tris(2,3-dibromopropyl) phosphate, 5 parts of antimony trioxide, and 6 parts of kaolin gel. The wire core consists of, from the outside to the inside, a metal shield 8, an insulating shield 9, an insulating layer 10, a conductor shield 11, and a conductor 13. The conductor 13 is surrounded by a semi-conductive nylon tape 12. The metal shield is made of copper tape. The insulating layer 10 is made of thermoplastic polypropylene insulation material composed of 50 parts polypropylene, 40 parts POE elastomer, 2.0 parts silica, and 0.5 parts antioxidant 1010. The conductor shield 11 and the insulating shield 9 are made of thermoplastic polypropylene shield material composed of 50 parts polypropylene, 40 parts POE elastomer, 10 parts carbon nanotubes, 1.0 part oxidized polyethylene, and 0.2 parts antioxidant 1010.

[0045] The environmentally friendly flame-retardant halogen-free polypropylene cables obtained in the above embodiments and comparative examples were tested for insulation performance, flame retardant performance, and fire resistance performance. The water absorption test involved placing the dried sample in water at 85°C for 336 hours, measuring the weight difference before and after immersion, and calculating the water absorption. The high-temperature pressure test involved pressing a test tool onto the sample with a specified force, placing it in an air oven at 130°C for 6 hours, and then cooling the sample and measuring the indentation depth. The low-temperature tensile test involved placing a sample of a specified shape on a tensile testing machine in a -25°C low-temperature chamber, cooling it for at least 4 hours, and measuring the elongation at a specified tensile speed. In the flame retardant test, the burning height was the difference between the distance between the lower edge of the upper support and the starting point of the lower carbonization, and the distance between the lower edge of the upper support and the starting point of the upper carbonization. In the cable bundle flame retardant test, the carbonization range on the sample should not exceed 2.5m above the bottom edge of the torch. The test results are shown in Table 1.

[0046]

[0047] As shown in Table 1, the environmentally friendly flame-retardant halogen-free polypropylene cables obtained in Examples 1-3 exhibit good mechanical properties, high temperature resistance, large current carrying capacity, and good flame retardant properties. Their insulation performance meets the requirements of T / CEEIA 591-2022, their flame retardant performance meets the requirements of GB / T 19666-2019 and can meet Class A requirements, and their fire resistance performance meets the requirements of TICW 8-2012. When the rated voltage U0 is applied to the cable for 90 minutes, it does not break down. Within 1 hour after the test, the integrity of the cable is checked. When a test voltage of 3.5U0 is applied to the cable for 15 minutes while maintaining the original test conditions, it still does not break down. In Example 4, only organic flame retardants were used in the fire-resistant layer, and in Example 5, only inorganic flame retardants were used, resulting in poor flame retardant performance of the polypropylene cable. In Comparative Example 1, no ceramic powder was added to the fire-resistant layer, resulting in a lack of a ceramic-like hard protective layer and poor flame retardant performance of the polypropylene cable.

[0048] Finally, it should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to replace them; it is neither necessary nor possible to exemplify all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the invention still fall within the scope of protection of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. An environmentally friendly flame-retardant halogen-free polypropylene cable, characterized in that: The invention comprises a plurality of wire cores and a binding tape (6), an isolation sleeve (5), a fire-resistant layer (4), an armor layer (3) and a sheath layer (1) arranged in sequence from the inside to the outside of the wire cores. The wire core comprises a metal shield (8), an insulation shield (9), an insulation layer (10), a conductor shield (11) and a conductor (13) in sequence from the outside to the inside. The insulation shield (9), the insulation layer (10) and the conductor shield (11) are extruded onto the conductor (13), and the metal shield (8) is wrapped around the insulation shield (9) to obtain a wire core. The obtained wire cores are then twisted together, gaps between the wire cores are filled, and the binding tape (6) is wrapped around them. The isolation sleeve (5) and the fire-resistant layer (4) are then extruded in sequence. After the armor layer (3) is wrapped around it, the sheath layer (1) is finally extruded.

2. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 1, characterized in that: The refractory layer (4) is made of ceramic polyolefin refractory material.

3. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 2, characterized in that: The ceramic polyolefin refractory material is obtained by mixing 80-100 parts of ethylene-vinyl acetate copolymer, 40-60 parts of ceramic powder, 10-20 parts of flame retardant and 5-10 parts of kaolin gel.

4. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 3, characterized in that: The flame retardant is a mixture of an organic flame retardant and an inorganic flame retardant in a mass ratio of 6-8:2-4.

5. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 1, characterized in that: An isolation zone (2) may be provided between the armor layer (3) and the sheath layer (1).

6. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 1, characterized in that: The conductor shield (11) and the insulation shield (9) are made of thermoplastic polypropylene shielding material.

7. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 6, characterized in that: The thermoplastic polypropylene shielding material is obtained by mixing 40-60 parts of polypropylene, 30-50 parts of POE elastomer, 10-20 parts of carbon nanotubes, 1.0-2.0 parts of lubricant and 0.1-0.5 parts of antioxidant.

8. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 1, characterized in that: The insulating layer (10) is made of thermoplastic polypropylene insulating material.

9. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 8, characterized in that: The thermoplastic polypropylene insulation material is obtained by mixing 40-60 parts of polypropylene, 30-50 parts of POE elastomer, 1.0-5.0 parts of inorganic filler and 0.1-1.0 parts of antioxidant.

10. The environmentally friendly flame-retardant halogen-free polypropylene cable according to claim 1, characterized in that: A semi-conductive nylon tape (12) may be wrapped around the conductor.

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