Power shielding cable insulation protection layer material for top drive and preparation method of power shielding cable insulation protection layer material

Abstract

The invention relates to the field of high polymer materials, and particularly discloses a power shielding cable insulation protection layer material for a top drive and a preparation method of the power shielding cable insulation protection layer material. The insulating protective layer material comprises the following raw materials in parts by weight: 100 parts of polyether type thermoplastic polyurethane elastomer; 12 to 15 parts of an ethylene-vinyl acetate copolymer; 5-8 parts of a compatilizer; 2-4 parts of an antioxidant; 0.3 to 0.7 part of a lubricant; 14 parts of a halogen-free flame retardant; 1-2 parts of an anti-hydrolysis agent; 4 to 6 parts of basalt fiber; and 6-9 parts of a filler. The preparation method comprises the following steps: preparing the raw materials according to the ratio, and pretreating the raw materials; the raw materials are mixed, extruded and granulated to obtain the insulating protective layer material. The insulating protective layer material has the advantage of being excellent in low temperature resistance.

Description

Technical Field

[0001] This application relates to the field of polymer materials, and more specifically, to an insulation protective layer material for a top-drive power shielded cable and a method for preparing the same. Background Technology

[0002] With the accelerated development of the Far East and marine resources, oil extraction activities face extreme weather and complex marine environments, leading to increasing demands on oil platforms to operate in extremely cold conditions. Their safe and stable operation is crucial for ensuring energy supply and national energy security. As a key component for power transmission and data communication on oil platforms, the performance and quality of the power shielded cable used in the top drive directly affect the stability and safety of the entire platform.

[0003] For development in extremely cold environments, power shielded cables used in the top drive of oil platforms need to possess excellent low-temperature resistance to ensure that the cable's flexibility and current carrying capacity are not compromised under low-temperature conditions. The construction and maintenance of oil platforms require a large number of power shielded cables suitable for low-temperature operation, driving the research and development and production of related oil platform cables.

[0004] The cable insulation layer is a key component that protects the conductor and prevents current leakage. Some current cable insulation materials have low low-temperature resistance and are easily corroded and damaged by the external environment, failing to meet the performance requirements of power shielded cables for oil platform top drives. Summary of the Invention

[0005] To improve the low-temperature resistance of cable insulation protective layer materials, this application provides an insulation protective layer material for top drive power shielded cables and its preparation method.

[0006] In a first aspect, this application provides an insulation protective layer material for a top-drive power shielded cable, employing the following technical solution:

[0007] An insulation protective layer material for a top-drive power shielded cable comprises the following raw materials in parts by weight:

[0008] 100 parts of polyether-type thermoplastic polyurethane elastomer;

[0009] 12-15 parts of ethylene-vinyl acetate copolymer;

[0010] 5-8 parts compatibilizer;

[0011] Antioxidant 2-4 parts;

[0012] Lubricant 0.3–0.7 parts;

[0013] 14 parts of halogen-free flame retardant;

[0014] 1-2 parts of anti-hydrolysis agent;

[0015] 4-6 parts of basalt fiber;

[0016] 6 to 9 parts of packing material.

[0017] By employing the above technical solutions, polyether-type thermoplastic polyurethane elastomer (TPU) serves as the matrix material, providing excellent elasticity, abrasion resistance, and low-temperature resistance, offering structural support for other functional components, and ensuring the overall flexibility of the material. Ethylene-vinyl acetate copolymer (EVA) increases the disorder of the TPU molecular chains, lowers the embrittlement temperature of the insulating protective layer material (down to -70℃), and improves cold resistance. Through the partial compatibility of polar vinyl acetate segments with TPU, it improves filler dispersion. The island-like structure formed by EVA and TPU effectively absorbs impact energy at low temperatures. Compatibilizers reduce phase separation and filler agglomeration, ensuring uniform dispersion of basalt fibers and fillers, and enhancing mechanical properties. Antioxidants extend material life, preventing TPU / EVA chain breakage during high-temperature processing (such as extrusion) or long-term humid and hot environments, and maintaining low-temperature performance stability. Anti-hydrolysis agents and antioxidants work together to ensure the long-term stability of the material in humid and hot environments, preventing a significant decrease in mechanical properties due to hydrolysis. As a processing aid, the lubricant reduces melt viscosity, decreases frictional agglomeration between basalt fibers and fillers, and improves extrusion flowability. Furthermore, the lubricant, in conjunction with the compatibilizer, ensures uniform distribution of basalt fibers and fillers within the matrix, preventing mechanical property degradation caused by localized stress concentration. The halogen-free flame retardant provides excellent flame retardant properties for the insulation protective layer material. Basalt fibers and fillers together construct a reinforcement-buffer network, with the basalt fibers bearing the main load and the fillers absorbing impact energy, synergistically enhancing mechanical properties. This material not only possesses high strength but also exhibits ultra-low temperature resistance (-65℃) and flame retardant properties, significantly expanding the range of applicable environments for cables.

[0018] Optionally, the compatibilizer comprises POE-g-MAH and KH560 in a weight ratio of 1:1.

[0019] By employing the above technical solutions, maleic anhydride-grafted polyolefin (POE-g-MAH) enhances the compatibility of TPU and EVA through chemical bonding. The epoxy groups of epoxy silane (KH560) react with the hydroxyl groups on the filler surface, thereby improving the filler-matrix bonding force.

[0020] Optionally, the antioxidant includes a primary antioxidant 1010 and a secondary antioxidant 168 in a weight ratio of 2:1.

[0021] By adopting the above technical solution, the primary antioxidant 1010 captures free radicals and the secondary antioxidant 168 decomposes hydrogen peroxide, which can inhibit oxidative degradation during processing and use.

[0022] Optionally, the lubricant comprises calcium stearate and silicone masterbatch in a weight ratio of 1:1.

[0023] Optionally, the halogen-free flame retardant is nano-aluminum hydroxide, ammonium polyphosphate, and silicone powder in a weight ratio of 4:2:1.

[0024] By employing the above technical solution, nano-aluminum hydroxide undergoes endothermic decomposition to release water vapor, diluting flammable gases; ammonium polyphosphate promotes char formation and isolates oxygen; and silicone powder forms a Si-O-Si protective layer, inhibiting dripping. This multi-component compound covers both gas-phase and condensed-phase flame retardancy, encompassing the entire flame-retardant stage and achieving UL94 V-0 certification. Simultaneously, the hydrophobicity of the silicone powder enhances the material's moisture resistance, indirectly improving low-temperature stability.

[0025] Optionally, the filler comprises modified MOFs and modified zeolite molecular sieves in a weight ratio of 1:2.

[0026] By employing the above technical solutions, the nanopores (pore size 0.3–2 nm) of MOFs can limit the low-temperature embrittlement of molecular chains and alleviate internal stress. After hydrophobication treatment, they can adsorb trace amounts of water, reducing the formation of low-temperature ice crystals. Zeolite molecular sieves treated with Ag… + After treatment, Ag + Polarized adsorption of moisture can suppress microcracks caused by water freezing at low temperatures. The island structure formed by EVA and TPU effectively absorbs impact energy at low temperatures. The micropores (0.5–1 nm) of MOFs and zeolite molecular sieves form a hierarchical porous structure, which not only optimizes the internal humidity environment of the material but also buffers stress. The island structure, in conjunction with the zeolite structure, further widens the temperature resistance window (-70℃ to 120℃), significantly improving the material's cold resistance. Furthermore, the zeolite molecular sieve captures free radicals through ion exchange, delaying the combustion chain reaction and synergistically enhancing the flame-retardant effect with halogen-free flame retardants. Simultaneously, since power shielded cables operate in extreme low-temperature seawater environments, this filler combination forms a hydrophobic barrier, effectively reducing seawater erosion of the insulation layer material, thereby improving the material's oil and salt spray resistance.

[0027] Optionally, the insulating protective layer material further includes 2 to 3 parts by weight of zinc phosphate and 3 to 4 parts by weight of hydrotalcite.

[0028] By adopting the above technical solution, the chemical inhibition effect provided by zinc phosphate and the physical barrier effect of hydrotalcite are combined, and it can be used as part of the filler system to enter the matrix of the insulating protective layer material. When the insulating protective layer material is eroded by seawater, a protective film is formed to protect the insulating protective layer material, thereby improving the material's oil resistance and salt spray resistance.

[0029] Secondly, this application provides a method for preparing the insulation protective layer material of a top-drive power shielded cable, using the following technical solution:

[0030] A method for preparing an insulation protective layer material for a top-drive power shielded cable includes the following steps: preparing each raw material according to the proportion and performing raw material pretreatment; mixing the raw materials, extruding and granulating them to obtain the insulation protective layer material.

[0031] By adopting the above technical solution, the resulting insulating protective layer material has excellent low-temperature resistance.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. Because this application uses polyether-type thermoplastic polyurethane elastomer (TPU) as the matrix material to provide structural support for other functional components, ethylene-vinyl acetate copolymer (EVA) can increase the disorder of TPU molecular chains, reduce the embrittlement temperature of the insulating protective layer material (up to -70℃), and improve cold resistance. EVA and TPU form an island structure, which can effectively absorb impact energy at low temperatures. Basalt fiber and filler together construct a reinforcement-buffer network. Basalt fiber bears the main load, while filler absorbs impact energy, synergistically improving mechanical properties. This material not only has high strength but also ultra-low temperature resistance (-65℃) and flame retardant properties, greatly expanding the range of cable application environments.

[0034] 2. This application preferably employs modified MOFs and modified zeolite molecular sieves. EVA and TPU form an island structure, effectively absorbing impact energy at low temperatures. The micropores (0.5–1 nm) of the MOFs and zeolite molecular sieves create a hierarchical porous structure, which optimizes the internal humidity environment of the material. The pore structure also buffers stress, and the island structure further broadens the temperature resistance window (-70℃ to 120℃), significantly improving the material's cold resistance. Furthermore, the zeolite molecular sieve captures free radicals through ion exchange, delaying the combustion chain reaction and synergistically enhancing the flame-retardant effect with the halogen-free flame retardant. Simultaneously, since the power shielded cable operates in an extreme low-temperature seawater environment, this filler combination forms a hydrophobic barrier, effectively reducing seawater erosion of the insulation layer material, thereby improving the material's oil and salt spray resistance.

[0035] 3. The insulating protective layer material prepared by the method of this application has excellent low-temperature resistance. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments shall be performed under conventional conditions or conditions recommended by the manufacturer, and the raw materials used in the following embodiments shall be commercially available unless otherwise specified.

[0037] ZIF-8, CAS No. 59061-53-9, was purchased from Xi'an Qiyue Biotechnology.

[0038] Y-type zeolite, a NaY molecular sieve, was purchased from Shandong Hefeng Environmental Protection Technology Co., Ltd.

[0039] Basalt fiber, 4mm in length, aspect ratio 1000.

[0040] Mg-Al LDHs were purchased from Xi'an Qiyue Biotechnology.

[0041] Zinc phosphate, 100 nm.

[0042] Preparation Example

[0043] Preparation Example 1

[0044] The compatibilizer is prepared by mixing 10g of POE-g-MAH and 10g of KH560 evenly.

[0045] Preparation Example 2

[0046] Antioxidant: Take 10g of primary antioxidant 1010 and 5g of secondary antioxidant 168, mix them evenly, and the mixture is prepared.

[0047] Preparation Example 3

[0048] Lubricant: Take 1g of calcium stearate and 1g of silicone masterbatch, mix them evenly, and it is prepared.

[0049] Preparation Example 4

[0050] A halogen-free flame retardant is prepared by mixing 12g of nano aluminum hydroxide, 6g of ammonium polyphosphate and 3g of silicone powder evenly.

[0051] Preparation Example 5

[0052] Packing materials include modified MOFs and modified zeolite molecular sieves.

[0053] The modified MOFs were prepared as follows: 10g of MOFs were taken, ZIF-8 was selected in this preparation example, and immersed in a 5% (w / w) trimethylchlorosilane / toluene solution. The solution was required to completely immerse ZIF-8. The solution was refluxed at 80℃ for 2 hours, washed and dried to obtain the modified MOFs.

[0054] The modified zeolite molecular sieve is prepared as follows: Take 20g of zeolite molecular sieve (Y-type zeolite is selected in this preparation example), soak it in a 10% silver nitrate solution for 4 hours, ensuring that the solution completely submerges the zeolite molecular sieve, and dry it at 120℃ to obtain the modified zeolite molecular sieve.

[0055] Preparation method of filler: Take 10g of modified MOFs and 20g of modified zeolite molecular sieve and mix them evenly to obtain the filler.

[0056] Example

[0057] Example 1

[0058] An insulation protective layer material for a top drive power shielded cable, comprising the following raw materials:

[0059] Polyether-type thermoplastic polyurethane elastomer, specifically BASF 1185A10U polyether-type TPU in this example; ethylene-vinyl acetate copolymer with a VA content of 28%; compatibilizer obtained in Preparation Example 1; antioxidant obtained in Preparation Example 2; lubricant obtained in Preparation Example 3; halogen-free flame retardant obtained in Preparation Example 4; anti-hydrolysis agent, specifically polycarbodiimide (PCD) in this example; basalt fiber; and filler obtained in Preparation Example 5. The amounts of each raw material are detailed in Table 1.

[0060] A method for preparing an insulation protective layer material for a top-drive power shielded cable includes the following steps:

[0061] (1) Surface treatment of basalt fiber: The basalt fiber was immersed in acetone or anhydrous ethanol and ultrasonically cleaned for 30 minutes to remove surface oil and impurities. Then it was rinsed with deionized water and dried (60℃×2 hours). KH-550 silane coupling agent was dissolved in an ethanol-water mixed solvent (ethanol:water=9:1) with a mass fraction of 8%, and the pH was adjusted to 5. The solution was stirred and hydrolyzed for 30 minutes to form KH-550 solution. The cleaned basalt fiber was completely immersed in KH-550 solution at 40℃ for 6 hours with ultrasonic assistance (40 kHz, 30 minutes). After removing the basalt fiber, the solution was drained and placed in an oven for staged curing: 80℃×1 hour (pre-curing) and 120℃×2 hours (complete curing) to promote the covalent bonding between silane and hydroxyl groups on the fiber surface.

[0062] (2) Dynamic vulcanization blending to prepare TPU / EVA premix:

[0063] Polyether-type thermoplastic polyurethane elastomer (TPU) and ethylene-vinyl acetate copolymer (EVA) were premixed in a mixer at 160°C for 5 minutes. 0.5 g of dicumyl peroxide (DCP) was added, and the mixture was vulcanized at 180°C for 8 minutes to promote dynamic vulcanization crosslinking of TPU-EVA.

[0064] (3) Twin-screw extrusion granulation

[0065] Temperature zones: feeding zone 160℃, melting zone 180℃, mixing zone 190℃, extrusion zone 200℃.

[0066] Screw speed: 300 rpm, high shear section uses 45° staggered kneading blocks.

[0067] Feeding sequence: The main feed port is for TPU / EVA premix; the side feed port is for halogen-free flame retardant; the rear feed port is for compatibilizer, filler and basalt fiber; the last feed port is for antioxidant, lubricant and anti-hydrolysis agent.

[0068] Example 2

[0069] The difference between this embodiment and Embodiment 1 is that the amount of each raw material used is different, as detailed in Table 1.

[0070] Example 3

[0071] The difference between this embodiment and Embodiment 1 is that the amount of each raw material used is different, as detailed in Table 1.

[0072] Example 4

[0073] The difference between this embodiment and Example 2 is that the filler in this embodiment is the modified MOFs from Preparation Example 5.

[0074] Example 5

[0075] The difference between this embodiment and Example 2 is that the filler in this embodiment is the modified zeolite molecular sieve from Preparation Example 5.

[0076] Example 6

[0077] The difference between this embodiment and Example 4 is that the filler in this embodiment is the MOFs from Preparation Example 5, which are unmodified.

[0078] Example 7

[0079] The difference between this embodiment and Example 4 is that the filler in this embodiment is the zeolite molecular sieve from Preparation Example 5, which is unmodified.

[0080] Example 8

[0081] The difference between this embodiment and Embodiment 2 is that the insulating protective layer material in this embodiment also includes zinc phosphate and hydrotalcite. See Table 1 for specific dosages.

[0082] The hydrotalcite selected is Mg-Al LDHs, which requires pretreatment before use: hydrotalcite and sodium stearate are ultrasonically treated in ethanol at a molar ratio of 1:1 for 2 hours, and then centrifuged and dried.

[0083] In a method for preparing an insulation protective layer material for a top-drive power shielded cable, the material is added together with a halogen-free flame retardant at the side feed port.

[0084] Example 9

[0085] The difference between this embodiment and Embodiment 4 is that the amounts of zinc phosphate and hydrotalcite are different, as detailed in Table 1.

[0086] Example 10

[0087] The difference between this embodiment and Embodiment 4 is that the amounts of zinc phosphate and hydrotalcite are different, as detailed in Table 1.

[0088] Example 11

[0089] The difference between this embodiment and Embodiment 5 is that zinc phosphate is not present in this embodiment.

[0090] Example 12

[0091] The difference between this embodiment and embodiment 5 is that there is no hydrotalcite in this embodiment.

[0092] Example 13

[0093] The difference between this embodiment and embodiment 5 is that the hydrotalcite in this embodiment has not undergone pretreatment.

[0094] Comparative Example

[0095] Comparative Example 1

[0096] The difference between this comparative example and Example 2 is that this comparative example does not contain ethylene-vinyl acetate copolymer, basalt fiber and filler, the compatibilizer is POE-g-MAH, the antioxidant is antioxidant 1010, the lubricant is calcium stearate and the halogen-free flame retardant is ammonium polyphosphate.

[0097] Comparative Example 2

[0098] The difference between this comparative example and Example 2 is that this comparative example does not contain ethylene-vinyl acetate copolymer.

[0099] Comparative Example 3

[0100] The difference between this comparative example and Example 2 is that this comparative example does not contain basalt fibers.

[0101] Comparative Example 4

[0102] The difference between this comparative example and Example 2 is that there is no filler in this comparative example.

[0103] Comparative Example 5

[0104] The difference between this comparative example and Example 2 is that the compatibilizer in this comparative example is POE-g-MAH.

[0105] Comparative Example 6

[0106] The difference between this comparative example and Example 2 is that the antioxidant in this comparative example is antioxidant 1010.

[0107] Comparative Example 7

[0108] The difference between this comparative example and Example 2 is that the lubricant in this comparative example is calcium stearate.

[0109] Comparative Example 8

[0110] The difference between this comparative example and Example 2 is that the halogen-free flame retardant in this comparative example is ammonium polyphosphate.

[0111] Table 1. Amount and type of materials used in each embodiment and comparative example.

[0112] TPU EVA Compatibilizer dosage / g Types of compatibilizers Antioxidant dosage / g Types of antioxidants Lubricant dosage / g Types of lubricants Halogen-free flame retardant dosage / g Types of halogen-free flame retardants Anti-hydrolysis agent / g Basalt fiber / g filler dosage / g Types of packing Zinc phosphate / g Hydrotalcite dosage / g Does the hydrotalcite require pretreatment? Example 1 100 12 5 Preparation Example 1 2 Preparation Example 2 0.3 Preparation Example 3 14 Preparation Example 4 1 4 6 Preparation Example 5 0 0 / Example 2 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 0 0 / Example 3 100 15 8 Preparation Example 1 4 Preparation Example 2 0.7 Preparation Example 3 14 Preparation Example 4 2 6 9 Preparation Example 5 0 0 / Example 4 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Modified MOFs 0 0 / Example 5 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Modified zeolite molecular sieves 0 0 / Example 6 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 MOFs 0 0 / Example 7 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Zeolite molecular sieve 0 0 / Example 8 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 2 3 yes Example 9 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 2.6 3.4 yes Example 10 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 3 4 yes Example 11 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 0 3.4 yes Example 12 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 2.6 0 / Example 13 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 2.6 3.4 no Comparative Example 1 100 0 7 POE-g-MAH 3 Antioxidant 1010 0.5 calcium stearate 14 Ammonium polyphosphate 1.5 0 0 / 0 0 / Comparative Example 2 100 0 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 0 0 / Comparative Example 3 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 0 8 Preparation Example 5 0 0 / Comparative Example 4 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 0 / 0 0 / Comparative Example 5 100 13 7 POE-g-MAH 3 Preparation Example 2 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 0 0 / Comparative Example 6 100 13 7 Preparation Example 1 3 Antioxidant 1010 0.5 Preparation Example 3 14 Preparation Example 4 1.5 5 8 Preparation Example 5 0 0 / Comparative Example 7 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 calcium stearate 14 Preparation Example 4 1.5 5 8 Preparation Example 5 0 0 / Comparative Example 8 100 13 7 Preparation Example 1 3 Preparation Example 2 0.5 Preparation Example 3 14 Ammonium polyphosphate 1.5 5 8 Preparation Example 5 0 0 /

[0113] Performance testing

[0114] Detection method

[0115] The materials prepared in the above embodiments and comparative examples were respectively made according to specifications of 3X150-3x16mm. 2 The 2000V cable requires extrusion molding at a temperature of 160℃ and a thickness of 2.5mm. Various samples were prepared and subjected to the following tests. Five samples were prepared for each material and each test method. The test results were averaged. See Table 2 for details.

[0116] 1. Low-temperature impact resistance: Referring to the test method in 8.5 of "GB / T 2951.14-2008", the samples prepared in each embodiment and comparative example were tested at -65℃, and the surface cracks of the material were observed.

[0117] 2. Flame retardant performance: Referring to the test method of "GB / T 18380.12-2008", for the samples prepared in each embodiment and comparative example, if the distance between the lower edge of the upper support and the starting point of the charred part is greater than 50mm, the wire and cable pass this test; otherwise, if the burning extends downward to a distance greater than 540mm from the lower edge of the upper support, it should be judged as unqualified and recorded.

[0118] 3. Mechanical properties: Refer to "GB / T 2951.11-2008" to prepare small dumbbell-shaped specimens and test the tensile strength of the material.

[0119] 3. Oil resistance: Samples were prepared according to the test method in 10 of GB / T 2951.21-2008. The oil temperature was 100±2℃ and the immersion time was 24h. The change rate of tensile strength before and after immersion in mineral oil was tested.

[0120] 4. Salt spray resistance: Refer to the test method in Appendix F of "GB / T 29631-2013", the test time is 336h, and the change rate of tensile strength before and after the salt spray test is detected.

[0121] Table 2. Test results for each embodiment and comparative example.

[0122] Low temperature impact resistance Flame retardant properties Tensile strength (N / mm²) Oil-resistant tensile strength change rate / % Salt spray resistance tensile strength change rate / % Example 1 No cracks qualified 4.15 29.4 23.3 Example 2 No cracks qualified 4.21 29.1 23.6 Example 3 No cracks qualified 4.13 29.5 23.4 Example 4 1. The sample has cracks qualified 4.01 34.2 28.5 Example 5 1. The sample has cracks qualified 4.05 34.1 28.3 Example 6 1. The sample has cracks qualified 3.88 35.9 29.7 Example 7 1. The sample has cracks qualified 3.91 35.6 29.5 Example 8 No cracks qualified 4.32 26.5 20.1 Example 9 No cracks qualified 4.35 26.2 19.7 Example 10 No cracks qualified 4.33 26.4 20 Example 11 No cracks qualified 4.27 27.9 21.5 Example 12 No cracks qualified 4.25 28 21.7 Example 13 No cracks qualified 4.29 27.8 21.4 Comparative Example 1 All 5 samples had cracks. Unqualified 3.35 42.2 34.2 Comparative Example 2 3 samples had cracks qualified 3.61 38.1 31.1 Comparative Example 3 3 samples had cracks qualified 3.68 37.5 30.8 Comparative Example 4 4 samples had cracks Unqualified 3.55 38.7 31.6 Comparative Example 5 1. The sample has cracks qualified 3.79 36.9 30.2 Comparative Example 6 1. The sample has cracks qualified 3.82 36.5 30 Comparative Example 7 1. The sample has cracks qualified 3.84 36.2 29.8 Comparative Example 8 1. The sample has cracks Unqualified 3.83 36.3 29.9

[0123] As can be seen from Examples 2 and Comparative Examples 1-8, and Table 2, the insulating protective layer material prepared in this application, using polyether-type thermoplastic polyurethane elastomer (TPU) as the matrix material, provides excellent elasticity, abrasion resistance, and low-temperature resistance, providing structural support for other functional components and ensuring the overall flexibility of the material. Ethylene-vinyl acetate copolymer (EVA) can increase the disorder of the TPU molecular chains, reduce the embrittlement temperature of the insulating protective layer material (up to -70°C), and improve cold resistance. Through the partial compatibility of polar vinyl acetate segments with TPU, it can improve filler dispersion. The island structure formed by EVA and TPU can effectively absorb impact energy at low temperatures. The compatibilizer can reduce phase separation and filler agglomeration, ensuring uniform dispersion of basalt fibers and fillers, and enhancing mechanical properties. The antioxidant can extend the material's lifespan, prevent TPU / EVA chain breakage during high-temperature processing (such as extrusion) or long-term humid and hot environments, and maintain low-temperature performance stability. The anti-hydrolysis agent and antioxidant together ensure the long-term stability of the material in humid and hot environments, avoiding a significant decrease in mechanical properties due to hydrolysis. As a processing aid, the lubricant reduces melt viscosity, decreases frictional agglomeration between basalt fibers and fillers, and improves extrusion flowability. Furthermore, the lubricant, in conjunction with the compatibilizer, ensures uniform distribution of basalt fibers and fillers within the matrix, preventing mechanical property degradation caused by localized stress concentration. The halogen-free flame retardant provides excellent flame retardant properties for the insulation protective layer material. Basalt fibers and fillers together construct a reinforcement-buffer network, with the basalt fibers bearing the main load and the fillers absorbing impact energy, synergistically enhancing mechanical properties. This material not only possesses high strength and high abrasion resistance but also exhibits ultra-low temperature resistance (-65℃) and flame retardant properties, greatly expanding the range of applicable environments for cables.

[0124] As can be seen from Examples 2, 4-7, and Table 2, the combination of modified MOFs and modified zeolite molecular sieves as fillers, combined with the island structure formed by EVA and TPU, can effectively absorb impact energy at low temperatures. The micropores of MOFs and zeolite molecular sieves form a hierarchical pore structure, which can jointly optimize the internal humidity environment of the material. The pore structure can also buffer stress, and the island structure further widens the temperature resistance window (-70℃ to 120℃), significantly improving the cold resistance of the material. Furthermore, zeolite molecular sieves can capture free radicals through ion exchange, which can delay the combustion chain reaction and work synergistically with halogen-free flame retardants to exert a flame-retardant effect. At the same time, since the power shielded cable is in an extreme low-temperature seawater environment, this filler combination can form a hydrophobic barrier, effectively reducing the erosion of the insulation protective layer material by seawater, thereby improving the material's oil resistance and salt spray resistance.

[0125] As can be seen from Examples 2, 9, and 11-13, and Table 2, the chemical inhibition provided by zinc phosphate and the physical barrier effect of hydrotalcite can be combined to form a filler system that can be incorporated into the matrix of the insulating protective layer material. When the insulating protective layer material is eroded by seawater, a protective film is formed to protect the insulating protective layer material, thereby improving the material's oil resistance and salt spray resistance.

[0126] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An insulation protective layer material for a top drive power shielded cable, characterized in that, Including the following parts by weight of raw materials: 100 parts of polyether-type thermoplastic polyurethane elastomer; 12-15 parts of ethylene-vinyl acetate copolymer; 5-8 parts compatibilizer; Antioxidant 2-4 parts; Lubricant 0.3–0.7 parts; 14 parts of halogen-free flame retardant; 1-2 parts of anti-hydrolysis agent; 4-6 parts of basalt fiber; 6 to 9 parts of packing material.

2. The insulation protective layer material for a top drive power shielded cable according to claim 1, characterized in that: The compatibilizer comprises POE-g-MAH and KH560 in a weight ratio of 1:

1.

3. The insulation protective layer material for a top drive power shielded cable according to claim 1, characterized in that: The antioxidant comprises a primary antioxidant 1010 and a secondary antioxidant 168 in a weight ratio of 2:

1.

4. The insulation protective layer material for a top drive power shielded cable according to claim 1, characterized in that: The lubricant comprises calcium stearate and silicone masterbatch in a weight ratio of 1:

1.

5. The insulation protective layer material for a top drive power shielded cable according to claim 1, characterized in that: The halogen-free flame retardant is composed of nano-aluminum hydroxide, ammonium polyphosphate, and silicone powder in a weight ratio of 4:2:

1.

6. The insulation protective layer material for a top drive power shielded cable according to claim 1, characterized in that: The filler comprises modified MOFs and modified zeolite molecular sieves in a weight ratio of 1:

2.

7. The insulation protective layer material for a top drive power shielded cable according to claim 6, characterized in that: The insulating protective layer material also includes 2 to 3 parts by weight of zinc phosphate and 3 to 4 parts by weight of hydrotalcite.

8. A method for preparing the insulation protective layer material of a top drive power shielded cable according to any one of claims 1 to 7, characterized in that, The process includes the following steps: preparing each raw material according to the formula and performing raw material pretreatment; mixing the raw materials, extruding and granulating them to obtain the insulating protective layer material.