A power shield cable insulation protective layer material for a top drive and a preparation method thereof

Abstract

The application relates to the field of high polymer materials, and particularly discloses a power shielding cable insulation protective layer material for a top drive and a preparation method thereof. The insulation protective layer material comprises the following raw materials in parts by weight: 100 parts of polyether type thermoplastic polyurethane elastomer, 12-15 parts of ethylene-vinyl acetate copolymer, 5-8 parts of a compatilizer, 2-4 parts of an antioxidant, 0.3-0.7 parts of a lubricant, 14 parts of a halogen-free flame retardant, 1-2 parts of an anti-hydrolysis agent, 4-6 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 proportion, and pretreating the raw materials; and mixing and extruding the raw materials to obtain the insulation protective layer material. The insulation protective layer material has the advantages of excellent low-temperature resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high polymer materials, and more particularly to a power shielding cable insulation protective layer material for a top drive and a preparation method thereof. BACKGROUND

[0002] With the acceleration of the development of the Far East and the development of the ocean, oil exploitation activities will face extreme weather and complex marine environments, prompting the requirements for oil platforms to work in extremely cold environments to increase, and the safe and stable operation of the oil platforms is of great significance to ensure energy supply and national energy security. The power shielding cable for the top drive of the oil platform is a key component for power transmission and data communication of the oil platform, and its performance and quality directly affect the stability and safety of the entire platform.

[0003] For the development of extremely cold environments, the power shielding cable for the top drive of the oil platform needs to have excellent low-temperature resistance to ensure the flexibility and current-carrying capacity of the cable under low-temperature conditions. New and repaired oil platforms require a large number of power shielding cables suitable for low-temperature resistance, which drives the research and production of related oil platform cables.

[0004] The cable insulation protective layer is a key part for protecting the conductor and preventing current leakage. Some current cable insulation protective layer materials have low low-temperature resistance and are easily eroded and damaged by the external environment, which cannot meet the performance requirements of the power shielding cable for the top drive of the oil platform. SUMMARY

[0005] In order to improve the low-temperature resistance of the cable insulation protective layer material, the present application provides a power shielding cable insulation protective layer material for a top drive and a preparation method thereof.

[0006] In a first aspect, the present application provides a power shielding cable insulation protective layer material for a top drive, which adopts the following technical solution:

[0007] A power shielding cable insulation protective layer material for a top drive includes the following raw materials by weight:

[0008] 100 parts of polyether thermoplastic polyurethane elastomer;

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

[0010] 5-8 parts of compatibilizer;

[0011] 2-4 parts of antioxidant;

[0012] 0.3-0.7 parts of lubricant;

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

[0014] 1-2 parts of hydrolysis inhibitor;

[0015] Basalt fiber 4-6 parts;

[0016] Filler 6-9 parts.

[0017] By adopting the above technical scheme, the polyether type thermoplastic polyurethane elastomer (TPU) is used as the base material, excellent elasticity, wear resistance and low temperature resistance are provided, the other functional components are provided with structural support, and the overall flexibility of the material is ensured. The ethylene-vinyl acetate copolymer (EVA) can increase the disorder degree of the TPU molecular chain, reduce the embrittlement temperature of the insulating protective layer material (up to-70℃), improve the cold resistance, the polar vinyl acetate segment is partially compatible with the TPU, the filler dispersibility can be improved, the EVA and the TPU form an island structure, and the impact energy at low temperature can be effectively absorbed. The compatibilizer can reduce phase separation and filler agglomeration, ensure uniform dispersion of basalt fibers and fillers, and enhance mechanical properties. The antioxidant can prolong the service life of the material, prevent TPU / EVA chain rupture in high temperature processing (such as extrusion) or long-term humid heat environment, and maintain the stability of low temperature performance. The anti-hydrolysis agent and the antioxidant jointly ensure the long-term stability of the material in the humid heat environment, and avoid a large decrease in mechanical properties due to hydrolysis. The lubricant as a processing aid can reduce the melt viscosity, reduce the friction and agglomeration of basalt fibers and fillers, improve the extrusion flowability, and the lubricant cooperates with the compatibilizer to ensure uniform distribution of basalt fibers and fillers in the matrix, avoiding mechanical property decrease caused by local stress concentration. The halogen-free flame retardant provides excellent flame retardant performance for the insulating protective layer material. The basalt fiber and the filler jointly build a reinforced-cushioning network, the basalt fiber bears the main load, the filler absorbs impact energy, and the mechanical properties are synergistically improved. The material not only has high strength, but also has super low temperature resistance (-65℃) and flame retardant performance, greatly widening the use environment range of the cable.

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

[0019] By adopting the above technical scheme, the maleic anhydride grafted polyolefin (POE-g-MAH) enhances the compatibility of TPU and EVA through chemical bonding. The epoxy group of the epoxy silane (KH560) reacts with the hydroxyl group on the surface of the filler, which can improve the filler-matrix bonding force.

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

[0021] By adopting the above technical scheme, the primary antioxidant 1010 captures free radicals, and the secondary antioxidant 168 decomposes hydroperoxide, 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] The application discloses a preparation method of an insulation protective layer material for a top drive power shielding cable.

[0031] By adopting the technical scheme, the prepared insulation protective layer material has excellent low-temperature resistance.

[0032] To sum up, the application has the following beneficial effects:

[0033] 1. In the application, polyether thermoplastic polyurethane elastomer (TPU) is used as a base material to provide structural support for other functional components, ethylene-vinyl acetate copolymer (EVA) can increase the disorder degree of the TPU molecular chain, reduce the embrittlement temperature of the insulation protective layer material (up to -70 DEG C), improve the cold resistance, and the EVA and the TPU form an island structure, which can effectively absorb impact energy at low temperature. Basalt fibers and fillers jointly build a reinforced-cushion network, the basalt fibers bear the main load, the fillers absorb impact energy, and the mechanical properties are synergistically improved. The material not only has high strength, but also has super low-temperature resistance (-65 DEG C) and flame retardance, and the use environment range of the cable is greatly widened.

[0034] 2. In the application, modified MOFs and modified zeolite molecular sieves are preferably used, the EVA and the TPU form an island structure, which can effectively absorb impact energy at low temperature, the micropores (0.5-1 nm) of the MOFs and the zeolite molecular sieves form a multi-level pore structure, which can jointly optimize the humidity environment inside the material, the pore structure can also buffer stress, and the island structure is further widened to widen the temperature resistance window (-70 DEG C to 120 DEG C), and the cold resistance of the material is significantly improved. Moreover, the zeolite molecular sieves can capture free radicals through ion exchange, delay the combustion chain reaction, and synergistically play a flame-retardant effect with the halogen-free flame retardant. Meanwhile, since the power shielding cable is in an extremely low-temperature seawater environment, the filler combination can form a hydrophobic barrier, effectively reduce the erosion of seawater on the insulation protective layer material, and improve the oil resistance and salt mist resistance of the material.

[0035] 3. The method of the application has excellent low-temperature resistance. DETAILED DESCRIPTION

[0036] The application will be further described in detail in combination with the following examples. It should be specially pointed out that: in the following examples, the specific conditions are not specified, and the conventional conditions or the conditions recommended by the manufacturers are used, and in the following examples, the raw materials used can be obtained from ordinary market sales unless otherwise specified.

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

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

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

[0040] Mg-Al LDHs, purchased from Xi'an Qiyue Biology.

[0041] Zinc phosphate, 100 nm.

[0042] Preparation Example

[0043] Preparation Example 1

[0044] Compatibility agent, take 10 g of POE-g-MAH and 10 g of KH560, mix evenly, and prepare.

[0045] Preparation Example 2

[0046] Antioxidant, take 10 g of main antioxidant 1010 and 5 g of auxiliary antioxidant 168, mix evenly, and prepare.

[0047] Preparation Example 3

[0048] Lubricant, take 1 g of calcium stearate and 1 g of silicone master particles, mix evenly, and prepare.

[0049] Preparation Example 4

[0050] Halogen-free flame retardant, take 12 g of nano aluminum hydroxide, 6 g of ammonium polyphosphate, and 3 g of silicone powder, mix evenly, and prepare.

[0051] Preparation Example 5

[0052] Filler, including modified MOFs and modified zeolite molecular sieve.

[0053] The preparation method of the modified MOFs is: take 10 g of MOFs, ZIF-8 is selected in this preparation example, immerse in a trimethylchlorosilane / toluene solution with a mass fraction of 5%, the solution needs to completely immerse the ZIF-8, reflux at 80℃ for 2 hours, wash and dry, and prepare the modified MOFs.

[0054] The preparation method of the modified zeolite molecular sieve is: take 20 g of zeolite molecular sieve, Y zeolite is selected in this preparation example, soak in a silver nitrate solution with a mass fraction of 10% for 4 hours, the solution needs to completely immerse the zeolite molecular sieve, and dry at 120℃ to obtain the modified zeolite molecular sieve.

[0055] The preparation method of the filler is: take 10 g of modified MOFs and 20 g of modified zeolite molecular sieve, mix evenly, and prepare.

[0056] Example

[0057] Example 1

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

[0059] Polyether thermoplastic polyurethane elastomer, in this embodiment, 1185A10U polyether TPU produced by BASF, Germany; ethylene-vinyl acetate copolymer, VA content 28%; compatibilizer prepared in Preparation Example 1; antioxidant prepared in Preparation Example 2; lubricant prepared in Preparation Example 3; halogen-free flame retardant prepared in Preparation Example 4; anti-hydrolysis agent, in this embodiment, the anti-hydrolysis agent is polycarbodiimide (PCD); basalt fiber; filler prepared in Preparation Example 5. The amount of each raw material is shown in Table 1.

[0060] A preparation method of a power shielding cable insulation protective layer material for a top drive, comprising the following steps:

[0061] (1) Surface treatment of basalt fiber: soak the basalt fiber in acetone or anhydrous ethanol, ultrasonic cleaning for 30 minutes to remove surface oil stains and impurities, then rinse with deionized water and dry (60℃×2 hours). Dissolve KH-550 silane coupling agent in an ethanol-water mixed solvent (ethanol: water = 9:1) with a mass fraction of 8%, adjust the pH to 5, and stir for 30 minutes to form a KH-550 solution. Soak the cleaned basalt fiber in the KH-550 solution at 40℃ for 6 hours with ultrasonic assistance (40 kHz, 30 minutes). After taking out the basalt fiber, drain the solution and place it in an oven for staged solidification: 80℃×1 hour (pre-solidification), 120℃×2 hours (complete solidification), to promote the covalent bond between silane and the fiber surface hydroxyl group.

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

[0063] Mix polyether thermoplastic polyurethane elastomer (TPU) and ethylene-vinyl acetate copolymer (EVA) in an internal mixer at 160℃ for 5 minutes. Add 0.5g of dicumyl peroxide (DCP) and vulcanize at 180℃ for 8 minutes to promote dynamic vulcanization crosslinking of TPU-EVA.

[0064] (3) Twin-screw extrusion granulation

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

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

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

[0068] Example 2

[0069] The difference between this example and Example 1 is that the amount of each raw material is different, as shown in Table 1.

[0070] Example 3

[0071] The difference between this example and Example 1 is that the amount of each raw material is different, as shown in Table 1.

[0072] Example 4

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

[0074] Example 5

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

[0076] Example 6

[0077] The difference between this example and Example 4 is that the filler in this example is the MOFs in Preparation Example 5, which is not modified.

[0078] Example 7

[0079] The difference between this example and Example 4 is that the filler in this example is the zeolite molecular sieve in Preparation Example 5, which is not modified.

[0080] Example 8

[0081] The difference between this example and Example 2 is that the insulating protective layer material of this example further includes zinc phosphate and hydrotalcite. The specific amount is shown in Table 1.

[0082] The hydrotalcite selected is Mg-Al LDHs, which needs to be pretreated when used: the hydrotalcite is ultrasonically treated with sodium stearate in a molar ratio of 1:1 in ethanol for 2 hours, then centrifuged and dried.

[0083] A method for preparing an insulating protective layer material for a top drive power shielding cable, which is added together with a halogen-free flame retardant at a side feeding port.

[0084] Example 9

[0085] The difference between this example and Example 4 is that the amount of zinc phosphate and hydrotalcite is different, as shown in Table 1.

[0086] Example 10

[0087] The difference between this example and Example 4 is that the amount of zinc phosphate and hydrotalcite is different, as shown in Table 1.

[0088] Example 11

[0089] The difference between this example and Example 5 is that there is no zinc phosphate in this example.

[0090] Example 12

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

[0092] Example 13

[0093] The difference between this example and Example 5 is that the hydrotalcite in this example is not pretreated.

[0094] Comparative Example

[0095] Comparative Example 1

[0096] The difference between this comparative example and Example 2 is that there is no ethylene-vinyl acetate copolymer, basalt fiber and filler in this comparative example, 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 there is no ethylene-vinyl acetate copolymer in this comparative example.

[0099] Comparative Example 3

[0100] The difference between this comparative example and Example 2 is that there is no basalt fiber in this comparative example.

[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 Material raw material amount and types in each example and comparative example

[0112] TPU EVA Compatibilizer amount / g Compatibilizer type Antioxidant amount / g Antioxidant type Lubricant amount / g Lubricant type Halogen-free flame retardant amount / g Halogen-free flame retardant type Anti-hydrolysis agent / g Basalt fiber / g Filler amount / g Filler type Zinc phosphate / g Hydrotalcite amount / g Whether hydrotalcite is pretreated 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 sieve 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 test

[0114] Detection method

[0115] The materials prepared in each example and comparative example above were respectively prepared according to the specifications of 3X150-3x16mm 2 The cable with a voltage of 2000V was required to be extruded at an extrusion temperature of 160℃, with a thickness of 2.5mm, to prepare various samples, which were subjected to the following detection. There were 5 samples for each material and each detection method, and the average value was taken as the detection result. Details are shown in Table 2.

[0116] 1. Low temperature impact resistance: according to the test method of 8.5 in “GB / T 2951.14-2008”, the samples prepared in each example and comparative example were detected at-65℃, and the surface crack of the material was observed.

[0117] 2. Flame retardant property: according to the test method of “GB / T 18380.12-2008”, the distance between the lower edge of the upper support and the starting point of the carbonized part of the samples prepared in each example and comparative example was measured. If the distance was greater than 50mm, the wire and cable passed the test. In addition, if the combustion extended 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 property: according to “GB / T 2951.11-2008”, small dumbbell-shaped samples were prepared to detect the tensile strength of the material.

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

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

[0121] Table 2 Detection results of each example and comparative example

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

[0123] It can be seen from the combination of Example 2 and Comparative Examples 1-8 and Table 2 that the insulating protective layer material prepared in the present application uses polyether type thermoplastic polyurethane elastomer (TPU) as the base material, which provides excellent elasticity, wear resistance and low temperature resistance, provides structural support for other functional components, and ensures the overall flexibility of the material. Ethylene-vinyl acetate copolymer (EVA) can increase the disorder degree of TPU molecular chain, reduce the embrittlement temperature of the insulating protective layer material (up to -70°C), improve the cold resistance, and through the partial compatibility of the polar vinyl acetate segment with TPU, the filler dispersion can be improved, and the EVA and TPU form an island structure, which can effectively absorb impact energy at low temperature. The compatibilizer can reduce phase separation and filler agglomeration, ensure the uniform dispersion of basalt fibers and fillers, and enhance the mechanical properties. The antioxidant can prolong the service life of the material, prevent TPU / EVA chain rupture in high temperature processing (such as extrusion) or long-term humid heat environment, and maintain the stability of low temperature performance. The anti-hydrolysis agent and the antioxidant jointly ensure the long-term stability of the material in a humid heat environment, and avoid a significant decrease in mechanical properties due to hydrolysis. The lubricant as a processing aid can reduce the melt viscosity, reduce the friction and agglomeration of basalt fibers and fillers, improve the extrusion flowability, and the lubricant cooperates with the compatibilizer to ensure the uniform distribution of basalt fibers and fillers in the matrix, avoiding the decrease in mechanical properties caused by local stress concentration. The halogen-free flame retardant provides excellent flame retardant performance for the insulating protective layer material. The basalt fibers and fillers jointly build a reinforced-cushioning network, the basalt fibers bear the main load, and the fillers absorb impact energy, which synergistically improves the mechanical properties. The material not only has high strength and high wear resistance, but also has super low temperature resistance (-65°C) and flame retardant performance, which greatly widens the use environment range of the cable.

[0124] It can be seen from the combination of Example 2, Examples 4-7 and Table 2 that 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 temperature, the micropores of MOFs and zeolite molecular sieves form a multi-level pore structure, which can jointly optimize the humidity environment inside the material, and the pore structure can also buffer stress, synergistically with the island structure to further widen the temperature resistance window (-70°C to 120°C), and significantly improve the cold resistance of the material. Moreover, the zeolite molecular sieve can capture free radicals through ion exchange, which can delay the combustion chain reaction, and synergistically with the halogen-free flame retardant to play a flame retardant effect. At the same time, since the power shielding cable is in an extreme low temperature seawater environment, this filler combination can form a hydrophobic barrier to effectively reduce the erosion of seawater on the insulating protective layer material, thereby improving the oil and salt mist resistance of the material.

[0125] In combination with Example 2, Example 9, Example 11-13 and in combination with Table 2, it can be seen that the chemical inhibition provided by zinc phosphate and the physical barrier effect of hydrotalcite can be combined as part of a filler system that enters the matrix of the insulating protective layer material and forms a protective film when the insulating protective layer material is subjected to seawater erosion, thereby providing protection to the insulating protective layer material and improving the oil resistance and salt spray resistance of the material.

[0126] The specific embodiments are only illustrative of the application and are not intended to limit the application. Based on the description of the application, those skilled in the art can make modifications to the embodiments without creative contribution, but as long as the modifications are within the scope of the claims of the application, they are protected by the patent law.

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; The filler comprises 6-9 parts by weight, wherein the filler consists of modified MOFs and modified zeolite molecular sieves in a weight ratio of 1:2, wherein the modified MOFs are hydrophobicated MOFs, and the modified zeolite molecular sieves are Ag-treated MOFs. + The treated zeolite molecular sieve.

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 insulating protective layer material also includes 2 to 3 parts by weight of zinc phosphate and 3 to 4 parts by weight of hydrotalcite.

7. A method for preparing the insulation protective layer material of a top drive power shielded cable according to any one of claims 1 to 6, 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.