Bending-resistant liquid-cooled cable and preparation process thereof

Abstract

The invention discloses a bending-resistant liquid-cooled cable and a preparation process thereof, and belongs to the technical field of liquid-cooled cables, the bending-resistant liquid-cooled cable comprises a cable core, an inner sheath layer, a reinforcing layer and an outer sheath layer, the cable core is formed by twisting a wire core and a liquid-cooled channel, the wire core comprises a conductor and an insulating layer wrapping the conductor, and the liquid-cooled channel is of a high-density polyethylene extrusion molding structure; the insulating layer is prepared from the following raw materials in parts by mass: 40 to 60 parts of modified polyether-ether-ketone, 5 to 15 parts of hydroxyl aluminum nitride powder, 8 to 22 parts of ethylene-octylene copolymer, 0.5 to 4 parts of antioxidant, 0.8 to 3 parts of silane coupling agent, 2 to 7 parts of polytetrafluoroethylene micro powder and 1 to 6 parts of chlorinated paraffin. The bending-resistant liquid-cooled cable prepared by the invention has good bending resistance and is suitable for a large-current charging working condition.

Description

Technical Field

[0001] This invention belongs to the field of liquid-cooled cable technology, specifically a bend-resistant liquid-cooled cable and its manufacturing process. Background Technology

[0002] Traditional charging pile cables rely on natural air cooling or passive heat dissipation from the insulation layer. Under high-current fast charging conditions, heat accumulates rapidly in the conductor and insulation layer, with the temperature rise far exceeding the long-term temperature resistance limit of the polymer. This leads to accelerated insulation aging and cracking, decreased insulation resistance, and an increased risk of leakage. To overcome this heat dissipation bottleneck, liquid cooling solutions incorporate liquid cooling channels inside the cable. Forced convection of the coolant significantly improves heat dissipation efficiency, strictly controlling the cable temperature rise during high-current charging within a safe range. Currently, the insulation materials for liquid-cooled charging pile cables are still mainly ordinary polyvinyl chloride, cross-linked polyethylene, or polyetheretherketone (PEEK). Polyvinyl chloride and cross-linked polyethylene soften easily above 80°C, while PEEK, although possessing excellent high-temperature resistance, environmental stress resistance, and chemical corrosion resistance, suffers from poor flexibility, insufficient bending resistance, poor compatibility with thermally conductive fillers, and poor processing fluidity.

[0003] Furthermore, existing liquid-cooled cables commonly use copper tubes, aluminum alloy tubes, or thick-walled rigid plastic tubes as liquid cooling channels. These rigid structures, when twisted with the insulated core, easily form "rigid nodes" at bends, leading to high stress concentration. Once the channel is deformed by external pressure, the coolant flow rate significantly decreases or even becomes completely blocked. Moreover, the reciprocating friction between the insulated core and the rigid channel exacerbates the mechanical wear of the insulation layer, which shortens the cable's service life.

[0004] In summary, existing liquid-cooled cables can only optimize either heat dissipation or bending performance, making it difficult to simultaneously improve thermal conductivity, bending resistance, and high mechanical strength. Summary of the Invention

[0005] To overcome the aforementioned technical problems, this invention provides a bend-resistant liquid-cooled cable and its manufacturing process. The bend-resistant liquid-cooled cable prepared by this invention has good bend resistance and is suitable for high-current charging conditions.

[0006] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0007] A bend-resistant liquid-cooled cable includes a cable core, an inner sheath, a reinforcing layer, and an outer sheath. The cable core is formed by twisting a conductor and a liquid-cooling channel. The conductor includes a conductor and an insulation layer covering the conductor. The liquid-cooling channel is a high-density polyethylene (HDPE) extrusion molding structure. The insulating layer comprises the following raw materials in parts by weight: 40-60 parts modified polyether ether ketone, 5-15 parts aluminum hydroxynitride powder, 8-22 parts ethylene-octene copolymer (POE), 0.5-4 parts antioxidant, 0.8-3 parts silane coupling agent, 2-7 parts polytetrafluoroethylene micro powder and 1-6 parts chlorinated paraffin. Preferably, the insulating layer comprises the following raw materials in parts by weight: 45-55 parts modified polyether ether ketone, 8-15 parts aluminum hydroxynitride powder, 12-20 parts ethylene-octene copolymer, 1-3 parts antioxidant, 1-2 parts silane coupling agent, 3-5 parts polytetrafluoroethylene micro powder and 2-4 parts chlorinated paraffin.

[0008] According to some embodiments of the present invention, the cable core is formed by twisting 2 to 6 wires and 1 liquid cooling channel; preferably, the cable core is formed by twisting 4 to 5 wires and 1 liquid cooling channel.

[0009] According to some embodiments of the present invention, the conductor is a multi-strand copper wire bundle structure, with each copper wire having a diameter of 0.1~0.3mm, preferably 0.15~0.25mm.

[0010] According to some embodiments of the present invention, the inner diameter of the liquid cooling channel is 6-14 mm and the outer diameter is 10-18 mm; preferably, the inner diameter of the liquid cooling channel is 8-12 mm and the outer diameter is 12-16 mm.

[0011] According to some embodiments of the present invention, the modified polyetheretherketone is prepared by irradiation of polyetheretherketone (PEEK resin); gamma ray irradiation can cause the polyetheretherketone molecular chain to produce a cross-linked structure, thereby improving the mechanical strength and temperature resistance of the resin.

[0012] According to some embodiments of the present invention, the melt index of the polyether ether ketone is 18~27 g / 10 min.

[0013] According to some embodiments of the present invention, the density of the polyetheretherketone is 1.30~1.35 g / cm³. 3 .

[0014] The hydroxyl groups on the surface of aluminum nitride can react fully with silane coupling agents, promoting interfacial wetting and chemical bonding between hydroxyl aluminum nitride powder and modified polyether ether ketone under the action of silane coupling agents.

[0015] According to some embodiments of the present invention, the D50 of the aluminum hydroxynitride powder is 20~60 μm.

[0016] According to some embodiments of the present invention, the tensile strength of the ethylene-octene copolymer is 40~50 kgf / cm. 2Ethylene-octene copolymers have good compatibility with polyetheretherketone (PEEK) and can improve the flexibility of PEEK, resulting in better elongation at break of the insulation layer and improved bending resistance.

[0017] According to some embodiments of the present invention, the hardness of the ethylene-octene copolymer is 60~67HA.

[0018] According to some embodiments of the present invention, the bulk density of the polytetrafluoroethylene micro powder is 200~400g / L.

[0019] According to some embodiments of the present invention, the D50 of the polytetrafluoroethylene micropowder is 1~8μm, preferably 2~5μm.

[0020] According to some embodiments of the present invention, the melt flow index of the polytetrafluoroethylene micropowder is 4~8 g / 10 min.

[0021] According to some embodiments of the present invention, the antioxidant is at least one of antioxidant 1010 (CAS No.: 6683-19-8), antioxidant 168 (CAS No.: 31570-04-4), and antioxidant 1076 (CAS No.: 2082-79-3).

[0022] According to some embodiments of the present invention, the silane coupling agent is KH550, KH560 or KH570.

[0023] According to some embodiments of the present invention, the inner sheath layer is made of low-density polyethylene (LDPE).

[0024] According to some embodiments of the present invention, the thickness of the inner sheath layer is 1.0~2.5mm, preferably 1.5~2.0mm.

[0025] According to some embodiments of the present invention, the reinforcing layer is made of galvanized steel strip.

[0026] According to some embodiments of the present invention, the thickness of the reinforcing layer is 0.15~0.4mm, preferably 0.2~0.3mm.

[0027] According to some embodiments of the present invention, the outer sheath layer is made of neoprene rubber.

[0028] According to some embodiments of the present invention, the thickness of the outer sheath layer is 1.0~2.5mm, preferably 1.5~2.0mm.

[0029] This invention also discloses a manufacturing process for a bend-resistant liquid-cooled cable, comprising the following steps: S1. Preparation of insulating layer material: The raw materials are melt-blended in a twin-screw extruder according to the required ratio, and then extruded and granulated to obtain insulating layer granules; S2. Core preparation: Copper wires are bundled together to obtain a conductor; insulating granules are added to a single-screw extruder, and the insulating material is extruded to coat the outer surface of the conductor to obtain the core. S3. Liquid cooling channel molding: High-density polyethylene is added to a single screw extruder and extruded to form a liquid cooling channel tube; S4. Cable core stranding: The cable core is obtained by stranding the wire core and the liquid cooling channel tube; S5. Inner sheath layer wrapping: Low-density polyethylene is added to a single screw extruder to extrude the inner sheath material and wrap it around the outer surface of the cable core to obtain a cable core with an inner sheath. S6: Reinforcing layer wrapping: Galvanized steel strip is then used to wrap the cable core with the inner sheath to obtain a cable core with a reinforcing layer; S7. Outer sheath wrapping: Neoprene rubber material is added to a single screw extruder, and the outer sheath material is extruded and wrapped around the outer surface of the cable core with a reinforcing layer to obtain a bend-resistant liquid-cooled cable.

[0030] S1 also includes the pretreatment of aluminum nitride powder, wherein the pretreatment involves dispersing aluminum nitride in a 0.5~2 mol / L sodium hydroxide solution and stirring for 10~15 h under heating conditions of 90~110℃; wherein the ratio of aluminum nitride to sodium hydroxide is 1 / 10~15 g / L.

[0031] S1 also includes the modification of polyether ether ketone, and the modified polyether ether ketone is obtained after modification; wherein, during the modification, the polyether ether ketone is irradiated with γ-rays, and the irradiation dose is 20~40kGy, preferably 25~35kGy. In S1, the melt blending is performed at 320~360℃ for 20~30 minutes.

[0032] In S2, the pitch of the strand is 10 to 15 times the outer diameter of the conductor.

[0033] In S2, the barrel temperature of the single-screw extruder is 330~360℃, and the screw speed of the single-screw extruder is 200~250rpm.

[0034] In S2, the traction speed of the single screw extruder is 8~12m / min.

[0035] In S3, the barrel temperature of the single-screw extruder is 180~200℃, and the screw speed of the single-screw extruder is 200~250rpm.

[0036] In S3, the melt pressure of single-screw extrusion is 10~20MPa.

[0037] In S3, the extrusion molding is performed by extruding through a die with spiral guide ribs to obtain a liquid cooling channel tube with a guide rib height of 0.5~1.0mm and a guide rib pitch of 5~9mm.

[0038] In S4, air is introduced into the liquid cooling channel pipe before stranding and then sealed to prevent it from being flattened by the wire core during stranding.

[0039] In S5, the barrel temperature of the single-screw extruder is 160~180℃, and the screw speed of the single-screw extruder is 180~220rpm.

[0040] In S6, the overlap rate of the wrapping is 15-30%.

[0041] In S7, the barrel temperature of the single-screw extruder is 150~170℃, and the screw speed of the single-screw extruder is 160~200rpm.

[0042] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0043] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes γ-ray irradiation to modify polyether ether ketone molecular chains to form a moderately cross-linked structure, combined with the flexible long chain toughening of ethylene-octene copolymer, making the insulating layer more tough. Therefore, it has a strong ability to disperse bending stress and solves the rigid catalytic problem of polyether ether ketone.

[0044] After the hydroxylated aluminum nitride powder reacts fully with the coupling agent, a uniform thermally conductive pathway is formed in the modified polyetheretherketone matrix, meeting the heat dissipation requirements of high-power fast charging. This makes the bend-resistant liquid-cooled cable of this invention more heat-resistant and has a longer service life. Polytetrafluoroethylene micropowder and chlorinated paraffin effectively reduce the coefficient of friction of the insulation layer, making the insulation layer more wear-resistant. Attached Figure Description

[0045] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0046] Figure 1 This is a schematic diagram of the bend-resistant liquid-cooled cable of Example 1.

[0047] Figure 2 This is a schematic diagram of the bend-resistant liquid-cooled cable of Example 6.

[0048] Reference numerals: 1. Cable core; 2. Inner sheath layer; 3. Reinforcing layer; 4. Outer sheath layer; 10. Wire core; 20. Liquid cooling channel; 101. Conductor; 102. Insulation layer. Detailed Implementation

[0049] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0050] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0051] The "range" disclosed in this invention is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be combined arbitrarily; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for specific parameters, it is understood that ranges of 60-110 and 80-120 are also expected. Furthermore, if minimum range values ​​1 and 2 are listed, and if maximum range values ​​3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this invention, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed herein; "0-5" is merely a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer greater than or equal to 2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0052] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0053] Unless otherwise specified, all technical features and optional technical features of this invention can be combined to form new technical solutions.

[0054] Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0055] Unless otherwise specified, the terms "comprising" and "including" as used in this invention can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0056] Unless otherwise specified, the term "or" is inclusive in this invention. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0057] The raw material information used in the following examples is as follows: Polyetheretherketone (PEEK) resin was purchased from Changchun Jida University. It is a semi-crystalline aromatic thermoplastic engineering plastic prepared by the condensation reaction of 4,4-difluorobenzophenone and hydroquinone in the presence of alkali metal carbonates using diphenyl sulfone as a solvent; its density is 1.32 g / cm³. 3 The melt flow index is 20~24 g / 10 min; Aluminum nitride was purchased from Brofos-AlN-QW40 by Bohuas Nanotechnology Co., Ltd., with a D50 of 40~60μm and a tap density of 1.8~2.0g / cm³. 3 Thermal conductivity > 170 W·m -1 ·K -1 ; The ethylene-octene copolymer is derived from SK Chemicals' POE Solumer 865, with a tensile strength of 44 kgf / cm. 2 Hardness is 63HA, melt flow index is 5g / 10min; The polytetrafluoroethylene micro powder was purchased from Shanghai Jingshang Chemical Co., Ltd., with a D50 of 2~5μm and a melt index of 4~8g / 10min. The density of low-density polyethylene is 0.927 g / cm³. 3 The density of high-density polyethylene is 0.950 g / cm³. 3 ; This includes, but is not limited to, the models from the above manufacturers.

[0058] Example 1 1. For the bending-resistant liquid-cooled cable structure of this embodiment, please refer to [reference needed]. Figure 1It includes a cable core 1, an inner sheath layer 2 (1.5~2.0mm), a reinforcing layer 3 (0.2~0.3mm), and an outer sheath layer 4 (1.5~2.0mm); the cable core 1 is formed by twisting 5 wire cores 10 and 1 liquid cooling channel 20; the wire core 10 includes a conductor 101 and an insulation layer 102 covering the conductor; the conductor 101 is formed by twisting 0.2mm copper wire bundles.

[0059] The liquid cooling channel is an extruded high-density polyethylene (HDPE) structure; the inner diameter of the liquid cooling channel is 8~12mm and the outer diameter is 12~16mm; By weight, the insulating layer is composed of the following raw materials: 50 parts modified polyether ether ketone, 12.5 parts aluminum hydroxynitride powder, 15 parts ethylene-octene copolymer, 2.9 parts antioxidant, 1.5 parts silane coupling agent (KH550), 4 parts polytetrafluoroethylene micro powder and 3 parts chlorinated paraffin. In this embodiment, the antioxidants are 1.8 parts of antioxidant 1010 and 1.1 parts of antioxidant 168; The inner sheath is made of low-density polyethylene (LDPE). The reinforcing layer is made of galvanized steel strip; The outer sheath is made of neoprene rubber; 2. The manufacturing process of the bend-resistant liquid-cooled cable in this embodiment is as follows: S1. Preparation of insulating layer material: Pretreatment of aluminum nitride powder: Aluminum nitride was dispersed in a 1.2 mol / L sodium hydroxide solution, with a material-to-solution ratio of 1 / 10 g / L. The mixture was stirred at 95°C for 12 hours, then washed with water until neutral, and dried at 100°C for 5 hours. Modification of polyether ether ketone: Polyether ether ketone was irradiated with γ rays at a dose of 30 kGy for 2.5 h to obtain modified polyether ether ketone; The raw materials were added to a twin-screw extruder according to the above ratio, and melt-blended at 330~360℃ for 25min (feeding section 320~330℃, homogenization section 340~350℃), and then extruded and granulated to obtain insulating layer granules. S2. Core preparation: Copper wires are bundled together to obtain a conductor with a bundle pitch of 12 times the conductor's outer diameter; Insulation layer granules are added to a single-screw extruder with a traction speed of 10m / min, a barrel temperature of 355℃, and a screw speed of 220rpm to extrude the insulation layer material and coat it onto the outer surface of the conductor to obtain the core. S3. Liquid cooling channel molding: High-density polyethylene is added to a single screw extruder and extruded on a die with spiral guide ribs. The melt pressure is 18MPa, and a liquid cooling channel tube with a guide rib height of 0.8mm and a guide rib pitch of 6mm is obtained. S4. Cable core stranding: Before stranding, air is introduced into the liquid cooling channel tube and then sealed (to prevent the core from being flattened during stranding). The core and the liquid cooling channel tube are stranded in an untwisted stranding manner with an untwisted rate of 92%, resulting in a cable core with an outer diameter of 18mm and a pitch of 450mm. S5. Inner sheath layer wrapping: Low-density polyethylene is added to a single-screw extruder with a barrel temperature of 170℃, a screw speed of 200rpm, and a vacuum degree of -0.085MPa. The inner sheath material is extruded and wrapped around the outer surface of the cable core. After extrusion, it is water-cooled at 28℃ to set the shape, thus obtaining a cable core with an inner sheath. S6: Reinforcing layer wrapping: Galvanized steel is then used to wrap the cable core with the inner sheath at a speed of 12m / min and an overlap rate of 20% to obtain a cable core with a reinforcing layer. S7. Outer sheath wrapping: Add neoprene rubber material to a single screw extruder, with the barrel temperature at 160℃ and the screw speed at 180rpm, and extrude the outer sheath material to wrap the outer surface of the cable core with the reinforcing layer, to obtain a bend-resistant liquid-cooled cable.

[0060] Example 2 The difference between this embodiment and Embodiment 1 is as follows: By weight, the insulating layer is composed of the following raw materials: 60.7 parts modified polyether ether ketone, 15.4 parts aluminum hydroxynitride powder, 18.5 parts ethylene-octene copolymer, 1.9 parts antioxidant (antioxidant 1010), 1.3 parts silane coupling agent (KH550), 4 parts polytetrafluoroethylene micro powder and 3.5 parts chlorinated paraffin; The other structures, raw materials, steps and parameters are the same as in Example 1.

[0061] Example 3 The difference between this embodiment and Embodiment 1 is as follows: By weight, the insulating layer is composed of the following raw materials: 52.8 parts modified polyether ether ketone, 6.3 parts aluminum hydroxynitride powder, 15 parts ethylene-octene copolymer, 2.9 parts antioxidant, 1.8 parts silane coupling agent, 5.0 parts polytetrafluoroethylene micro powder and 3.5 parts chlorinated paraffin. The other structures, raw materials, steps and parameters are the same as in Example 1.

[0062] Example 4 The difference between this embodiment and Embodiment 1 is as follows: Modification of polyether ether ketone: Polyether ether ketone was irradiated with 20 kGy of γ rays to obtain modified polyether ether ketone; The other structures, raw materials, steps and parameters are the same as in Example 1.

[0063] Example 5 The difference between this embodiment and Embodiment 1 is as follows: The insulating layer, by weight, is composed of the following raw materials: 50 parts modified polyether ether ketone, 12.5 parts aluminum nitride powder, 15 parts ethylene-octene copolymer, 2.9 parts antioxidant, 1.5 parts silane coupling agent (KH550), 8 parts polytetrafluoroethylene micro powder, and 4 parts chlorinated paraffin; other structures, raw materials, steps, and parameters are the same as in Example 1.

[0064] Example 6 The difference between this embodiment and Embodiment 1 is as follows: A schematic diagram of the bend-resistant liquid-cooled cable structure in this embodiment is shown below. Figure 2 The difference lies in the fact that cable core 1 is made up of 4 wire cores 10 and 1 liquid cooling channel 20 twisted together; The other structures, raw materials, steps and parameters are the same as in Example 1.

[0065] Comparative Example 1 The difference between this comparative example and Example 2 is as follows: The polyether ether ketone used in the preparation of the insulating layer in this comparative example was unmodified, and the other structures, raw materials, steps and parameters were the same as in Example 1.

[0066] Comparative Example 2 The difference between this comparative example and Example 2 is as follows: The raw materials used to prepare the insulating layer in this embodiment do not contain ethylene-octene copolymer, and the other structures, raw materials, steps and parameters are the same as in Example 1.

[0067] The bend-resistant liquid-cooled cables prepared in the above embodiments and comparative examples were subjected to the following tests.

[0068] Test Example 1—Bending Resistance Test The test standard was IEC 60811-504:2012, the bending radius was 5 times the cable outer diameter, the bending angle was ±90° (i.e., bending 90° to the left and right from the initial position), and the number of bending cycles was 20,000. After the bending test, the insulation resistance change rate and mass change rate were measured, and the test results are shown in Table 1.

[0069] Table 1

[0070] Test Example 2—High Current Load Test Connect both ends of the conductor of the cable sample to a high current generator, connect the liquid cooling channel to the liquid cooling circulation system (the constant temperature water tank is set to 25℃), the liquid cooling medium is polyethylene glycol, and the liquid cooling flow rate is 5L / min; test with a rated current of 300A for 4 hours, and then test with an overload current of 400A for 30 minutes; turn off the current and the liquid cooling system, and cool to the ambient temperature (25℃). After repeating the above test process 50 times, check whether the insulation layer has softened or deformed, and whether the liquid cooling channel has leaked. The test results are shown in Table 2, which can be used to evaluate the temperature resistance performance under actual charging conditions.

[0071] Table 2

[0072] Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in this invention can be purchased commercially or prepared using existing methods. The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this invention. It should be understood that the above descriptions are merely specific embodiments of this invention and are not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A bend-resistant liquid-cooled cable, characterized by, The cable core, the inner sheath layer, the reinforcing layer and the outer sheath layer, the cable core is twisted by the wire core and the liquid cooling channel, the wire core includes the conductor and the insulating layer coated outside the conductor, the liquid cooling channel is the high-density polyethylene extrusion molding structure; The insulating layer includes the following mass parts of preparation raw materials: 40~60 parts of modified polyether ether ketone, 5~15 parts of hydroxyl aluminum nitride powder, 8~22 parts of ethylene-octene copolymer, 0.5~4 parts of antioxidant, 0.8~3 parts of silane coupling agent, 2~7 parts of polytetrafluoroethylene micro powder and 1~6 parts of chlorinated paraffin; Preferably, the insulating layer includes the following mass parts of preparation raw materials: 45~55 parts of modified polyether ether ketone, 8~15 parts of hydroxyl aluminum nitride powder, 12~20 parts of ethylene-octene copolymer, 1~3 parts of antioxidant, 1~2 parts of silane coupling agent, 3~5 parts of polytetrafluoroethylene micro powder and 2~4 parts of chlorinated paraffin.

2. The bend-resistant liquid-cooled cable of claim 1, wherein, The cable core is twisted by 2~6 wire cores and 1 liquid cooling channel; preferably, the cable core is twisted by 4~5 wire cores and 1 liquid cooling channel; And / or, the conductor is a multi-strand copper wire bundle twisted structure, each strand of copper wire has a diameter of 0.1~0.3mm, preferably 0.15~0.25mm; And / or, the inner diameter of the liquid cooling channel is 6~14mm, and the outer diameter is 10~18mm; preferably, the inner diameter of the liquid cooling channel is 8~12mm, and the outer diameter is 12~16mm.

3. The flexible liquid-cooled cable of claim 2, wherein, The modified polyether ether ketone is prepared after irradiation of polyether ether ketone; and / or the polyether ether ketone has a density of 1.30 to 1.35 g / cm3 3 .

4. The bend-resistant liquid-cooled cable of claim 3, wherein. The D50 of the hydroxyl aluminum nitride powder is 20~60μm; and / or the ethylene-octene copolymer has a breaking strength of 40 to 50 kgf / cm 2 ; And / or, the volume density of the polytetrafluoroethylene micro powder is 200~400g / L; And / or, the D50 of the polytetrafluoroethylene micro powder is 1~8μm, preferably 2~5μm.

5. The flexible liquid-cooled cable of claim 1, wherein, The antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076; And / or, the silane coupling agent is KH550, KH560 or KH570.

6. The flexible liquid-cooled cable of claim 1, wherein, At least one of the following conditions a~f is met: a. The material of the inner sheath layer is low-density polyethylene; b. The thickness of the inner sheath layer is 1.0~2.5mm, preferably 1.5~2.0mm; c. The material of the reinforcing layer is galvanized steel strip; d. The thickness of the reinforcing layer is 0.15~0.4mm, preferably 0.2~0.3mm; e. The material of the outer sheath layer is chloroprene rubber material; f. The thickness of the outer sheath layer is 1.0~2.5mm, preferably 1.5~2.0mm.

7. A process for the preparation of a bend-resistant liquid-cooled cable, characterized in that, The following steps are included: S1. Preparation of insulating layer material: melt blend the preparation raw materials in the double screw extruder according to the required ratio, extrude and granulate to obtain insulating layer granules; S2. Wire core preparation: bundle and twist the copper wire to obtain the conductor; add the insulating layer granules to the single screw extruder, extrude the insulating layer material to coat the outer surface of the conductor to obtain the wire core; S3. Liquid cooling channel molding: add high-density polyethylene to the single screw extruder to extrude and mold to obtain the liquid cooling channel pipe; S4. Cable core twisting: twist the wire core and the liquid cooling channel pipe to obtain the cable core; S5. Wrapping of the inner sheath layer: low-density polyethylene is added into a single-screw extruder, and the inner sheath material is extruded to coat the outer surface of the cable core, to obtain a cable core with an inner sheath; S6: Wrapping of the reinforcing layer: galvanized steel strips are used to wrap the cable core with an inner sheath, to obtain a cable core with a reinforcing layer; S7. Wrapping of the outer sheath: chloroprene rubber material is added into a single-screw extruder, and the outer sheath material is extruded to coat the outer surface of the cable core with a reinforcing layer, to obtain a bend-resistant liquid-cooled cable.

8. The process for preparing a flexible liquid-cooled cable according to claim 7, wherein, At least one of the following conditions a~b is met: a. S1 further comprises pretreatment of the hydroxyl aluminum nitride powder, which is dispersing aluminum nitride into a 0.5~2 mol / L sodium hydroxide solution, stirring for 10~15 h under heating conditions of 90~110 ℃; b. S1 further comprises modification of the polyether ether ketone, and the modified polyether ether ketone is obtained after modification; wherein the modification is carried out by irradiating the polyether ether ketone with γ-rays, and the irradiation dose is 20~40 kGy, preferably 25~35 kGy.

9. The process for preparing a flexible liquid-cooled cable according to claim 7, wherein, At least one of the following conditions a~f is met: a. In S1, the melt blending is mixed at 320~360 ℃ for 20~30 min; b. In S2, the pitch of the bundle twisting is 10~15 times the outer diameter of the conductor; c. In S2, the barrel temperature of the single-screw extruder is 330~360 ℃, and the screw rotation speed of the single-screw extruder is 200~250 rpm; d. In S3, the barrel temperature of the single-screw extruder is 180~200 ℃, and the screw rotation speed of the single-screw extruder is 200~250 rpm; e. In S3, the melt pressure of the single-screw extrusion is 10~20 MPa; f. In S3, the extrusion molding is carried out by a mold with spiral ribs, to obtain a liquid-cooled channel pipe with a rib height of 0.5~1.0 mm.

10. The process for preparing a flexible liquid-cooled cable according to claim 7, wherein At least one of the following conditions a~c is met: a. In S5, the barrel temperature of the single-screw extruder is 160~180 ℃, and the screw rotation speed of the single-screw extruder is 180~220 rpm; b. In S6, the overlap rate of the wrapping is 15~30%; c. In S7, the barrel temperature of the single-screw extruder is 150~170 ℃, and the screw rotation speed of the single-screw extruder is 160~200 rpm.

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