105 DEG C environment-resistant cable meeting UL2277 standard and preparation method of 105 DEG C environment-resistant cable

Abstract

The invention discloses a 105 DEG C environment-resistant cable meeting the UL2277 standard and a preparation method thereof, the cable comprises a conductor, an insulating layer and a sheath layer, the cable can be designed into a single-core or multi-core structure, the insulating layer takes ethylene-propylene-diene monomer and LDPE as base materials, and the base materials are matched with chemical method magnesium hydroxide and an organic composite flame retardant; the sheath layer uses CPE and EVA as composite base materials, and cooperates with magnesium hydroxide, aluminum hydroxide and antimony trioxide to construct a synergistic flame-retardant system. By optimizing the material formula and the structural design, the cable has excellent mechanical, flame-retardant, aging-resistant and oil-resistant properties in a dry environment of 105 DEG C, is suitable for fixed laying of a wind power generation tower drum and torsion laying of a cabin, is simple in preparation process and is suitable for large-scale production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a 105 DEG C environment-resistant cable meeting UL2277 standard and a preparation method thereof. BACKGROUND

[0002] With the rapid development of wind power generation technology, the cables used in wind power generation systems need to work stably in various harsh environments such as high temperature, low temperature, oil pollution and bending. The UL2277 standard makes clear requirements for the performance of wind turbine tray cables and flexible motor power supply cables, and the 105 DEG C dry state grade cable is widely used because it is suitable for high temperature environment.

[0003] At present, the common 105 DEG C grade cable on the market still has deficiencies in the aspects of insulation layer flame retardant efficiency, mechanical properties, aging resistance and processing technology. For example, the insulation layer mostly uses single flame retardant filler, which leads to limited flame retardant effect and decreased mechanical properties; the sheath layer has high Mooney viscosity and uneven filler dispersion, which affects the extrusion processing and product reliability. In addition, the existing cable structure is single, and it is difficult to meet the needs of different power equipment and laying methods at the same time. Therefore, it is of great significance to develop a 105 DEG C environment-resistant cable with comprehensive performance, flexible structure and meeting UL2277 standard. SUMMARY

[0004] The technical problem to be solved by the present application is that the cable structure on the market is single, and it is difficult to meet the needs of different power equipment and laying methods at the same time.

[0005] The technical scheme adopted by the present application to solve the technical problem is that a 105 DEG C environment-resistant cable meeting UL2277 standard comprises a conductor and an insulation layer and a sheath layer successively coated outside the conductor, and the cable is a single-core cable or a multi-core cable. The insulation layer is prepared from the following raw materials in mass fraction: 90 parts of ethylene-propylene-diene terpolymer, 10 parts of LDPE, 100 parts of magnesium hydroxide by chemical method, 40 parts of organic composite flame retardant, 5 parts of paraffin, 2 parts of anti-aging agent, 1 part of silane coupling agent and 3 parts of vulcanizing agent. The sheath layer is prepared from the following raw materials in mass fraction: 90 parts of CPE, 10 parts of EVA, 70 parts of magnesium hydroxide, 70 parts of aluminum hydroxide, 10 parts of antimony trioxide, 20 parts of N550 carbon black, 20 parts of DOS, 1 part of anti-aging agent, 1 part of flow aid and 3 parts of vulcanizing agent.

[0006] The Mooney viscosity of the CPE is 95-105 at 100 DEG C, the purity of the magnesium hydroxide by chemical method is greater than or equal to 99%, the particle size distribution is uniform and the D50 is 1-5 microns.

[0007] The organic composite flame retardant is a phosphorus-nitrogen composite flame retardant, the antioxidant is a hindered phenol antioxidant, and the vulcanizing agent is a peroxide vulcanizing agent.

[0008] When the cable is a multi-core cable, a plurality of conductors covered by the insulation layer are twisted to form a cable core, and a filler layer is arranged between the cable core and the sheath layer, the filler layer being a flame-retardant hemp rope or a flame-retardant polypropylene rope.

[0009] The cable is provided with an inner positioning layer, and the inner positioning layer has a protrusion on the outer side for positioning the filler layer.

[0010] The cable is a wind turbine tray cable suitable for fixed laying of a wind power tower drum, and the cable is a flexible motor power supply cable suitable for torsional laying of a wind power generator cabin.

[0011] A method for preparing a 105℃ environmental-resistant cable meeting the UL2277 standard, comprising the following steps: Insulation layer mixing: the ethylene-propylene terpolymer, LDPE, magnesium hydroxide prepared by chemical method, organic composite flame retardant, paraffin, antioxidant and silane coupling agent in the insulation layer raw material are put into an internal mixer, and mixed at 110-120℃ for 5-8 minutes, and then the vulcanizing agent is added and mixed at 90-100℃ for 3-5 minutes to obtain an insulation mixing rubber; Sheath layer mixing: the CPE, EVA, magnesium hydroxide, aluminum hydroxide, antimony trioxide, N550 carbon black, DOS, antioxidant and flow aid in the sheath layer raw material are put into an internal mixer, and mixed at 100-110℃ for 4-6 minutes, and then the vulcanizing agent is added and mixed at 85-95℃ for 2-4 minutes to obtain a sheath mixing rubber; Extrusion molding: for a single-core cable, the insulation mixing rubber is extruded to cover the conductor, the extrusion temperature is 120-140℃, and the insulation layer is formed after cooling; then the sheath mixing rubber is extruded to cover the insulation layer, the extrusion temperature is 110-130℃, and the sheath layer is formed after cooling and setting; For a multi-core cable, a plurality of conductors are twisted to form a cable core after being covered by the insulation layer, and a flame-retardant filler material is filled outside the cable core, and then the sheath mixing rubber is extruded to cover the outside of the filler layer, and the cable is cooled and set; Vulcanization treatment: the extruded cable is placed in a vulcanization tank, and vulcanized at 160-170℃ and a pressure of 0.8-1.2MPa for 15-20 minutes to obtain a finished cable.

[0012] The rotor speed of the internal mixer in the insulation layer mixing step is 40-60r / min, and the rotor speed of the internal mixer in the sheath layer mixing step is 35-55r / min.

[0013] The extrusion thickness of the insulating layer in the extrusion molding step is 1.0-2.5 mm, and the extrusion thickness of the sheath layer is 1.2-3.0 mm.

[0014] The beneficial effects of this invention are: (1) By precisely optimizing the material formula of the insulation layer and the sheath layer, the cable can be used stably in a dry environment at 105℃, with excellent mechanical properties, flame retardant performance that meets the requirements of FT4 combustion test and horizontal combustion non-ignition, excellent low temperature performance, no cracks when cold bent at -40℃, outstanding aging resistance, and excellent oil resistance, so that the various performance indicators of the cable fully meet the requirements of UL2277 standard. (2) The insulation layer adopts a composite flame retardant system of chemical magnesium hydroxide and phosphorus-nitrogen organic composite flame retardant, which solves the defects of low flame retardant efficiency and poor mechanical properties caused by low purity and poor dispersibility of traditional physical magnesium hydroxide. The sheath layer adopts a CPE / EVA composite base material and a multi-element synergistic flame retardant system of magnesium hydroxide-aluminum hydroxide-antimony trioxide, which not only reduces Mooney viscosity and improves processing safety, but also solves the problem of uneven dispersion and easy agglomeration of inorganic fillers, while optimizing aging resistance and oil resistance. (3) Innovatively designed as a single-core or multi-core optional structure, the single-core cable has a simple structure and is suitable for low-power equipment or space-constrained laying scenarios; the multi-core cable optimizes the core structure through the filling layer, can integrate multiple circuits, reduce laying difficulty and cost, is suitable for the complex wiring needs of high-power wind power generation equipment, can fully adapt to different laying scenarios in the field of wind power generation, and greatly expands the application range of the cable. (4) The preparation process of single-core and multi-core cables differs only in the cabling stage. No additional complex equipment is required. The process parameters are clear and controllable, the production efficiency is high, and it is easy to realize large-scale industrial production. It has significant economic value and application prospects. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of Embodiment 2 of the present invention.

[0018] Figure 3 This is a schematic diagram of the inner positioning layer in Embodiment 2 of the present invention. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Figures 1, 2 and 3 show a 105°C environmentally resistant cable that meets the UL2277 standard, including a conductor 1 and an insulation layer 2 and a sheath layer 3 sequentially covering the outside of the conductor 1. The cable can be designed as a single-core cable or a multi-core cable according to actual power demand.

[0022] The insulating layer 2 is prepared from the following raw materials in parts by weight: 90 parts EPDM, 10 parts LDPE, 100 parts chemically produced magnesium hydroxide, 40 parts organic composite flame retardant, 5 parts paraffin wax, 2 parts antioxidant, 1 part silane coupling agent, and 3 parts vulcanizing agent.

[0023] EPDM: It has excellent weather resistance, aging resistance and electrical insulation properties, and is the core base material of the insulation layer; LDPE, short for low-density polyethylene, when combined with EPDM, can significantly improve the processing fluidity of the insulation layer and enhance the extrusion molding effect. Chemical magnesium hydroxide: purity ≥99%, uniform particle size distribution with D50 of 1-5μm, excellent dispersibility and water resistance, and synergistic effect with organic composite flame retardants to improve the mechanical properties of the insulation layer while ensuring flame retardant effect; Organic composite flame retardant: Phosphorus-nitrogen composite flame retardant is selected and formed with chemically produced magnesium hydroxide to form a composite flame retardant system, which greatly improves the flame retardant efficiency; Paraffin wax: As a lubricant, it optimizes the flowability of materials during processing and reduces processing resistance; Anti-aging agent: Hindered phenolic anti-aging agent is selected, which can significantly improve the aging resistance of the insulation layer and extend the service life of the cable; Silane coupling agent: Chemically produced magnesium hydroxide improves compatibility with EPDM and LDPE, enhances interfacial bonding, and avoids uneven filler dispersion; Vulcanizing agent: Peroxide-based vulcanizing agents are selected to ensure the vulcanization and cross-linking effect of the insulation layer and improve the structural stability of the insulation layer.

[0024] The sheath layer 3 is prepared from the following raw materials in parts by weight: CPE: 90 parts chlorinated polyethylene, EVA: 10 parts ethylene-vinyl acetate copolymer, magnesium hydroxide 70 parts, aluminum hydroxide 70 parts, antimony trioxide 10 parts, N550 carbon black 20 parts, DOS: dioctyl sebacate 20 parts, antioxidant 1 part, flow aid 1 part, and vulcanizing agent 3 parts.

[0025] CPE: With a Mooney viscosity of 95-105 at 100℃, it has good weather resistance, oil resistance and flame retardancy, and is the core base material of the sheath layer; EVA: When combined with CPE, it can significantly reduce the Mooney viscosity of the sheath layer and improve processing and extrusion safety; Magnesium hydroxide and aluminum hydroxide: as inorganic flame retardant fillers, they have both flame retardant and smoke suppression effects and are the core components of the synergistic flame retardant system; Antimony trioxide: It has a synergistic flame-retardant effect with chlorine in CPE, and together with magnesium hydroxide and aluminum hydroxide, it forms a multi-element synergistic flame-retardant system, which greatly improves the flame-retardant performance of the sheath layer; N550 carbon black: enhances the mechanical strength and UV resistance of the sheath layer 3, improving the cable's adaptability to outdoor environments; DOS: As a plasticizer, it improves the flexibility and processing performance of the rubber compound, making the sheath layer easier to extrude and mold; Antioxidant: Hindered phenolic antioxidants are selected to further optimize the aging resistance of the sheath layer; Flow aids: Improve the flowability of materials during processing and prevent localized clumping; Vulcanizing agent: Peroxide-based vulcanizing agents are selected to ensure the vulcanization quality of the sheath layer and improve the overall structural stability.

[0026] When the cable is a multi-core cable, multiple conductors 1, each covered with an insulation layer 2, are twisted together to form a cable core. An inner positioning layer 4 is provided around the cable core, and the outer side of the inner positioning layer 4 has an outwardly protruding structure. A flame-retardant filler material is filled on the outer side of the inner positioning layer 4 to form a filler layer 5. The protruding structure is used to position the filler layer 5 and ensure its limiting performance. The filler layer 5 is flame-retardant hemp rope or flame-retardant polypropylene rope. The function of the filler layer 5 is to make the cable core structure more rounded and stable, while further improving the overall flame-retardant performance of the cable and preventing damage to the insulation layer due to friction or displacement between the multi-core conductors.

[0027] The preparation method of the inner positioning layer 4 is as follows: Raw material selection and proportioning The inner positioning layer 4 uses flame-retardant modified polypropylene as the base material, combined with magnesium hydroxide flame retardant and related additives. The specific mass proportions are: 70 parts flame-retardant modified polypropylene, 30 parts magnesium hydroxide, 1 part silane coupling agent, 1 part hindered phenolic antioxidant, and 0.5 parts flow aid. This raw material system matches the overall temperature resistance and flame retardant performance requirements of the cable, and has good compatibility with insulation layer 2, sheath layer 3, and filler layer 5.

[0028] Raw material mixing The above raw materials are fed into an internal mixer. The rotor speed of the mixer is set to 40-50 r / min, the mixing temperature is controlled at 100-110℃, and the mixing time is 4-6 minutes to ensure that the raw materials are fully dispersed and blended to obtain a uniform positioning layer compound. This temperature range can prevent high-temperature degradation of the base material while ensuring the interfacial bonding effect between the flame retardant and the base material.

[0029] Extrusion molding The positioning layer compound is fed into a dedicated extruder, and the extrusion temperature is set to 110-130℃. It is then extruded through a custom mold with raised structures to obtain the inner positioning layer 4 blank. The height of the raised sections on the outer side of the blank is designed to be 2-3mm, and the spacing between the raised sections is designed to be 5-8mm. The size of the raised sections must be compatible with the thickness of the filler layer 5 and the diameter of the cable core to ensure that the raised sections can be fully embedded in the filler layer 5 for precise positioning.

[0030] Assembly positioning During the cabling stage of multi-core cables, the extruded inner positioning layer 4 blank is coaxially sleeved around the stranded cable core, and its position is fixed by tooling fixtures to ensure the coaxiality of the inner positioning layer 4 and the cable core. Subsequently, flame-retardant filler material is filled into the protrusion gaps on the outside of the positioning layer to form a structurally stable filler layer 5.

[0031] The type of cable can be flexibly selected according to the application scenario: Model: Wind turbine tray cable: Suitable for fixed installation in wind power generation towers; The model is a flexible motor power supply cable: suitable for torsional laying in wind turbine nacelles.

[0032] Both types of single-core or multi-core cables meet the UL2277 standard requirements for 1000V or 2000V voltage levels and 105℃ dry-state use, and have passed the -40℃ cold bending without cracking test, making them suitable for the harsh environment of wind power generation.

[0033] Example 1: Wind turbine tray cable, 1000V voltage rating. Raw material preparation (by weight) Insulation layer 2 raw materials: 90 parts of EPDM, 10 parts of LDPE, 100 parts of chemically produced magnesium hydroxide (purity 99.2%, D50=3μm), 40 parts of phosphorus-nitrogen composite flame retardant, 5 parts of paraffin wax, 2 parts of hindered phenolic antioxidant, 1 part of silane coupling agent, and 3 parts of peroxide vulcanizing agent.

[0034] Sheath layer 3 raw materials: 90 parts CPE (Mounney viscosity = 100 at 100℃), 10 parts EVA, 70 parts magnesium hydroxide, 70 parts aluminum hydroxide, 10 parts antimony trioxide, 20 parts N550 carbon black, 20 parts DOS, 1 part hindered phenolic antioxidant, 1 part flow aid, and 3 parts peroxide vulcanizing agent.

[0035] Preparation steps Insulation layer 2 raw material mixing: Put the raw materials of insulation layer 2 (except for the vulcanizing agent) into the internal mixer, set the rotor speed to 50 r / min, mix at 115℃ for 6 min, add the vulcanizing agent, mix at 95℃ for 4 min to obtain the insulating compound.

[0036] Sheath layer 3 raw material mixing: Put the raw materials of sheath layer 3 (except vulcanizing agent) into the internal mixer, set the rotor speed to 45 r / min, mix at 105℃ for 5 min, add vulcanizing agent, mix at 90℃ for 3 min to obtain sheath compound rubber.

[0037] Extrusion molding: A single conductor 1 is fed into the extruder, the temperature of the insulating barrel is controlled at 130℃, the insulating compound is extruded to cover the conductor, and after cooling, an insulating layer 2 with a thickness of 1.5mm is formed; then the temperature of the sheath barrel is controlled at 120℃, the sheath compound is extruded again to cover the insulating layer 2, and after cooling and shaping, the sheath layer 3 has a thickness of 1.8mm.

[0038] Vulcanization treatment: The extruded cable is placed in a vulcanizing tank and vulcanized at 165℃ and 1.0MPa pressure for 18 minutes to obtain a single-core WTTC cable.

[0039] Performance testing The cable was tested and found to be stable in dry conditions at 105℃. Its tensile strength (insulation layer 2: 7.8MPa, sheath layer 3: 13.2MPa) and elongation at break (insulation layer 2: 335%, sheath layer 3: 265%) both met the requirements. It passed the FT4 combustion test and the requirement of not igniting during horizontal combustion. It showed no cracks when cold-bent at -40℃. After 168 hours of aging at 121℃, its tensile strength retention rate was 92% and its elongation at break was 90%. After 7 days of aging at 136℃, its tensile strength retention rate was 106% and its elongation at break was 98%. After 96 hours of 902# oil at 100℃, its tensile strength retention rate was 97% and its elongation at break was 92%, fully complying with the UL2277 standard.

[0040] Example 2: Flexible motor power supply cable, 2000V voltage rating, 3 cores. Raw material preparation (by weight) The raw materials for insulation layer 2 are the same as those in Example 1; the raw materials for sheath layer 3 are the same as those in Example 1; the filler layer 5 is made of flame-retardant polypropylene rope; and the raw materials for inner positioning layer 4 are prepared according to the above proportions.

[0041] Preparation steps Insulation layer 2: raw material mixing; sheath layer 3: raw material mixing; inner positioning layer 4: raw material mixing and extrusion molding: all are performed according to the corresponding process parameters mentioned above.

[0042] Extrusion molding: Insulated wire cores (insulation layer thickness 2.0mm) are prepared by wrapping the three conductors 1 with insulation layer 2 according to the process in Example 1; the three insulated wire cores are fed into a cable forming machine for stranding, and the inner positioning layer 4 is fitted around the cable core and fixed by a tooling fixture. Then, flame-retardant polypropylene rope is filled into the protrusion gaps on the outside of the inner positioning layer 4 to form a round cable core; the cable core is fed into an extruder, the temperature of the sheath barrel is controlled at 125℃, the sheath compound is extruded to cover the cable core, and it is cooled and shaped, with a sheath layer 3 thickness of 2.5mm.

[0043] Vulcanization treatment: The extruded cable is placed in a vulcanizing tank and vulcanized at 168℃ and 1.1MPa pressure for 16 minutes to obtain a 3-core Flexible motor supply cable.

[0044] Performance testing The cable has been tested and all performance indicators meet the requirements of UL2277 standard. It is stable in dry conditions at 105℃ and has excellent mechanical properties, flame retardancy, low temperature performance, aging resistance and oil resistance. It is suitable for torsional laying scenarios in wind turbine nacelles.

[0045] This invention also discloses a method for preparing the above-mentioned 105°C environmentally resistant cable that meets the UL2277 standard, comprising the following steps: Insulation layer 2 raw material mixing Weigh out EPDM, LDPE, chemically processed magnesium hydroxide, organic composite flame retardant, paraffin wax, antioxidant, and silane coupling agent according to the formula, and put them into a mixer. Set the rotor speed of the mixer to 40-60 r / min and mix at 110-120℃ for 5-8 minutes to ensure that all raw materials are fully mixed and uniform. Then add the vulcanizing agent, adjust the temperature to 90-100℃, and continue mixing for 3-5 minutes to obtain a uniform insulating compound.

[0046] Sheath layer 3 Raw material mixing Weigh out CPE, EVA, magnesium hydroxide, aluminum hydroxide, antimony trioxide, N550 carbon black, DOS, antioxidant, and flow aid according to the formula, and put them into an internal mixer. Set the rotor speed of the internal mixer to 35-55 r / min and mix at 100-110℃ for 4-6 minutes to achieve uniform dispersion of raw materials. After adding the vulcanizing agent, adjust the temperature to 85-95℃ and mix for 2-4 minutes to obtain a stable sheath compound.

[0047] Inner positioning layer 4 Raw material mixing and extrusion The inner positioning layer 4 blank is prepared by following the above-mentioned preparation process.

[0048] Extrusion molding Single-core cable preparation: A single conductor 1 is fed into an extruder through a wire feeding device. First, the insulating compound is added to the insulating barrel of the extruder, and the extrusion temperature is controlled at 120-140℃. The insulating compound is evenly coated on the outside of the conductor 1 through a die. After cooling to room temperature in a cooling water tank, the insulation layer 2 is formed. Then, the sheathing compound is added to the sheathing barrel of the extruder, and the extrusion temperature is controlled at 110-130℃. The sheathing compound is coated on the outside of the insulation layer 2 through a second extrusion, and then cooled and shaped again.

[0049] Multi-core cable preparation: Multiple conductors 1 are prepared into insulated cores with insulation layer 2 according to the insulation layer 2 coating process of single-core cable described above; the multiple insulated cores are fed into a cable forming machine for stranding. During the stranding process, an inner positioning layer 4 is sleeved on the outside of the insulated core. Then, flame-retardant filler material is filled into the protrusion gaps on the outside of the inner positioning layer 4 to form a cable core with a round structure; the cable core is fed into an extruder, and the sheath compound is wrapped on the outside of the cable core. The extrusion temperature is controlled at 110-130℃. After cooling and shaping, a filler layer 5 and a sheath layer 3 are formed.

[0050] Vulcanization The extruded single-core or multi-core cable is placed in a vulcanizing tank and vulcanized at 160-170℃ and 0.8-1.2MPa pressure for 15-20 minutes to fully crosslink and cure the insulation layer 2, sheath layer 3 and inner positioning layer 4, resulting in a 105℃ environmentally resistant cable that meets the UL2277 standard.

[0051] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A 105°C environmentally resistant cable conforming to UL2277 standard, characterized in that, The cable includes a conductor (1) and an insulation layer (2) and a sheath layer (3) that are sequentially wrapped around the outside of the conductor (1). The cable is a single-core cable or a multi-core cable. The insulating layer (2) is prepared from the following raw materials in parts by weight: 90 parts of EPDM, 10 parts of LDPE, 100 parts of chemically produced magnesium hydroxide, 40 parts of organic composite flame retardant, 5 parts of paraffin wax, 2 parts of antioxidant, 1 part of silane coupling agent, and 3 parts of vulcanizing agent. The sheath layer (3) is prepared from the following raw materials in parts by weight: 90 parts CPE, 10 parts EVA, 70 parts magnesium hydroxide, 70 parts aluminum hydroxide, 10 parts antimony trioxide, 20 parts N550 carbon black, 20 parts DOS, 1 part antioxidant, 1 part flow aid, and 3 parts vulcanizing agent.

2. The 105°C environmentally resistant cable conforming to UL2277 standard according to claim 1, characterized in that, The Mooney viscosity of the CPE is 95-105 at 100°C; the purity of the chemically produced magnesium hydroxide is ≥99%, the particle size distribution is uniform, and the D50 is 1-5μm.

3. The 105°C environmentally resistant cable conforming to UL2277 standard according to claim 1, characterized in that, The organic composite flame retardant is a phosphorus-nitrogen composite flame retardant, the antioxidant is a hindered phenolic antioxidant, and the vulcanizing agent is a peroxide vulcanizing agent.

4. The 105°C environmentally resistant cable conforming to UL2277 standard according to claim 1, characterized in that, When the cable is a multi-core cable, multiple conductors (1) covered with the insulation layer (2) are twisted together to form a cable core. A filler layer (5) is provided between the cable core and the sheath layer (3). The filler layer (5) is flame-retardant hemp rope or flame-retardant polypropylene rope.

5. The 105°C environmentally resistant cable conforming to UL2277 standard according to claim 4, characterized in that, The cable is provided with an inner positioning layer (4) on its periphery, and the outer side of the inner positioning layer (4) has an outward protrusion for positioning the filling layer (5).

6. The 105°C environmentally resistant cable conforming to UL2277 standard according to claim 1, characterized in that, The cable is a wind turbine tray cable, suitable for fixed installation on wind power generation towers; or a flexible motor power supply cable type, suitable for torsional installation in wind turbine nacelles.

7. A method for manufacturing a 105°C environmentally resistant cable conforming to UL2277 standard as described in any one of claims 1-6, characterized in that, Includes the following steps: Insulation layer mixing: EPDM, LDPE, chemically processed magnesium hydroxide, organic composite flame retardant, paraffin, antioxidant and silane coupling agent in the insulation layer (2) raw materials are put into a mixer and mixed at 110-120℃ for 5-8 minutes. Then vulcanizing agent is added and mixed at 90-100℃ for 3-5 minutes to obtain insulation compound; Sheath layer compounding: CPE, EVA, magnesium hydroxide, aluminum hydroxide, antimony trioxide, N550 carbon black, DOS, antioxidant and flow aid in the raw materials of sheath layer (3) are put into a mixer and mixed at 100-110℃ for 4-6 minutes. After adding vulcanizing agent, it is mixed at 85-95℃ for 2-4 minutes to obtain sheath compound; Extrusion molding: For single-core cables, the insulating compound is extruded and coated onto the conductor (1) at an extrusion temperature of 120-140°C, and cooled to form an insulating layer (2). Then, the sheath compound is extruded and coated onto the insulating layer (2) at an extrusion temperature of 110-130°C, and cooled to set. For multi-core cables, multiple conductors (1) are coated with insulating layers (2) and then twisted together to form a cable core. An inner positioning layer (4) is set around the cable core. A protruding positioning filling layer (5) is used to position the filling layer (5) on the outside of the inner positioning layer (4). Flame-retardant filling material is filled on the outside to form a filling layer (5). Then, the sheath compound is extruded and coated onto the outside of the filling layer (5), and cooled to set. Vulcanization treatment: The extruded cable is placed in a vulcanizing tank and vulcanized for 15-20 minutes at 160-170℃ and 0.8-1.2MPa pressure to obtain the finished cable.

8. The method according to claim 7, characterized in that, The rotor speed of the internal mixer in the mixing step of the insulation layer (2) is 40-60 r / min, and the rotor speed of the internal mixer in the mixing step of the sheath layer (3) is 35-55 r / min.

9. The method according to claim 7, characterized in that, The extrusion thickness of the insulating layer (2) in the extrusion molding step is 1.0-2.5 mm, and the extrusion thickness of the sheath layer (3) is 1.2-3.0 mm.

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