Oil-resistant and corrosion-resistant cable sheath material for robot as well as preparation method and application of oil-resistant and corrosion-resistant cable sheath material

Abstract

The invention relates to an oil-resistant and corrosion-resistant cable sheath material for a robot as well as a preparation method and application thereof. The oil-resistant and corrosion-resistant cable sheath material is particularly suitable for harsh environments such as underwater robots. According to the cable material, ultra-high molecular weight polypropylene, nitrile rubber, a fluorine-containing elastomer, a compatilizer, a filler and the like are used as main raw materials, and the ratio and performance of all the components are optimized, so that the oil resistance, acid and alkali corrosion resistance, salt penetration resistance and wear resistance of the cable material are remarkably improved, and meanwhile, the mechanical properties such as high tensile strength and elongation at break are maintained. According to the invention, the EPDM-g-MAH, the EPDM-g-MMA or the EPDM-g-GMA is selected as the compatilizer, so that the problem of compatibility between the polypropylene and the nitrile rubber is effectively solved. In addition, montmorillonite and talcum powder in a specific particle size range are adopted as a filler combination, so that the performance of the cable material is further optimized. The cable sheath material has remarkable advantages in the aspects of oil resistance, corrosion resistance, salt resistance and the like, the stability of the cable sheath material in severe environments is improved, and the cable sheath material is suitable for harsh environments such as underwater robots.

Description

Technical Field

[0001] The present invention relates to a cable for a composite underwater robot. More specifically, the present invention relates to a cable sheath material with excellent oil resistance, acid and alkali corrosion resistance, especially salt water immersion resistance, and a preparation method and application thereof. Background Art

[0002] Industrial robots are widely used in production lines such as automobile production lines, liquid crystal panels, and semiconductor chips for operations such as product transportation and component installation, and are also used in harsh environment equipment where workers cannot enter. Among these robots, cables are usually routed to their arms and cable carriers. In recent years, with the popularization of underwater operations, the applications of underwater robots, underwater salvage equipment, underwater detection, underwater construction, underwater cameras, and underwater hydraulic cutters have become increasingly widespread. For these underwater devices, power transmission, signal transmission, or signal control connection cables are the key to ensuring the safety of underwater operations. Therefore, underwater cables must have the following characteristics: First, the finished cable should not absorb water in water; second, the cable should have excellent acid and alkali corrosion resistance, especially after being immersed in harsh environments such as seawater for a long time, it can still maintain stable performance and have long-lasting comprehensive performance.

[0003] When robots perform underwater operations or oil and gas exploration operations, the impacts of environmental factors such as corrosion, fungal contamination, chemicals, oils, and water vapor on cables and robots are common problems. For cables, the current solution is usually to design an armor layer to enhance corrosion resistance and high-temperature resistance. However, the armor layer not only increases the weight of the cable, but also easily deforms when subjected to external collision or extrusion, thus affecting the performance of the cable. Especially in underwater operations, once the armor layer is damaged, the cable is more vulnerable to the erosion of water vapor and fungi. In addition, to deal with the water vapor problem, a water-blocking layer or water-blocking rope is usually designed to prevent the intrusion of water vapor after the armor layer is damaged. Generally speaking, when dealing with problems such as corrosion, fungal contamination, chemicals, oils, and water vapor, commercially available cables usually need to design different sheath protection layers to achieve the corresponding protection effects. This not only increases the volume of the cable, but also raises the usage cost.

[0004] Currently, common oil-resistant and corrosion-resistant polymer materials mainly include strongly polar rubbers such as chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, acrylate rubber, fluororubber, and some thermoplastic elastomers. However, the compatibility among these polymer materials is poor, and it is difficult to simultaneously meet the performance requirements of oil resistance, corrosion resistance, and salt resistance. Aiming at the problem that the existing cable materials cannot balance the oil resistance, acid and alkali corrosion resistance, and salt resistance, the present invention uses a fluorinated elastomer to replace traditional polytetrafluoroethylene (PTFE). The fluorinated elastomer not only has excellent oil resistance and corrosion resistance but also better flexibility and processability. In addition, the present invention selects maleic anhydride grafted ethylene-propylene-diene monomer rubber (EPDM-g-MAH), methyl methacrylate grafted ethylene-propylene-diene monomer rubber (EPDM-g-MMA), or glycidyl methacrylate grafted ethylene-propylene-diene monomer rubber (EPDM-g-GMA) as a compatibilizer. These compatibilizers significantly improve the compatibility between polypropylene and nitrile rubber through the non-polar EPDM chain segments and polar groups (such as maleic anhydride groups) in their molecular structures. The cable sheath material for robots prepared by the present invention not only has excellent oil resistance, acid and alkali corrosion resistance, salt penetration resistance, and wear resistance but also mechanical properties such as high tensile strength and elongation at break, and can meet the use requirements of harsh environments such as underwater robots. Summary of the Invention

[0005] Aiming at the problems of poor oil resistance and susceptibility to environmental influence of the cable sheath material for robots in the prior art, the present invention provides an oil-resistant and corrosion-resistant cable material for robots and its preparation method, which has excellent oil resistance, corrosion resistance, and salt resistance, and is suitable for harsh environments such as underwater robots.

[0006] The present invention provides an oil-resistant and corrosion-resistant cable sheath material for robots, which comprises the following raw material components in parts by weight: 80-100 parts of ultra-high molecular weight polypropylene, 30-50 parts of nitrile rubber, 5-10 parts of compatibilizer, 5-15 parts of fluorinated elastomer, 10-30 parts of filler, 1-5 parts of antioxidant, and 1-5 parts of lubricant.

[0007] Preferably, the compatibilizer is at least one of maleic anhydride grafted ethylene-propylene-diene monomer rubber, methyl methacrylate grafted ethylene-propylene-diene monomer rubber, and glycidyl methacrylate grafted ethylene-propylene-diene monomer rubber.

[0008] Preferably, the fluorinated elastomer comprises at least one of vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer (PVDF-TFE-HFP), tetrafluoroethylene-propylene copolymer (FEP), and tetrafluoroethylene-perfluoromethyl vinyl ether copolymer (TFE-PFMA).

[0009] Preferably, the filler includes montmorillonite and talcum powder; more preferably, the filler includes montmorillonite with an average particle size of 0.1 - 1 μm and talcum powder with an average particle size of 10 - 40 μm, where the mass ratio of montmorillonite to talcum powder is 5 - 10:1 - 4.

[0010] Preferably, the filler is prepared by modification with a coupling agent; preferably, the coupling agent includes at least one of γ-aminopropyltriethoxysilane, vinyltriethoxysilane, γ-glycidylethoxypropyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0011] Preferably, the nitrile rubber is a powdered nitrile rubber with an acrylonitrile content of 25 - 35 wt%.

[0012] Preferably, the lubricant is selected from at least one of stearic acid, polyethylene wax, calcium stearate, and zinc stearate.

[0013] Preferably, the antioxidant includes at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1790, and antioxidant DLTDP.

[0014] Preferably, the ultra-high molecular weight polypropylene resin has a weight-average molecular weight of 500,000 - 1,200,000, the ultra-high molecular weight polypropylene is homopolypropylene or an ethylene-propylene copolymer, and the melt flow rate of the ultra-high molecular weight polypropylene resin at 230 °C under a load of 2.16 kg is 0.1 - 15 g / 10 min.

[0015] The present invention uses ultra-high molecular weight polypropylene (UHMWPP) as the main raw material. Due to its long molecular chains, the entanglement and interaction between chain segments are significantly enhanced. This unique structure makes it difficult for chemical substances to penetrate into the material interior, thereby effectively reducing the risk of corrosion. At the same time, ultra-high molecular weight polypropylene also has excellent insulation performance, which can prevent the insulation performance of the cable from decreasing due to chemical erosion in a corrosive environment. With its stable chemical structure, high molecular weight barrier effect, and good insulation performance, ultra-high molecular weight polypropylene exhibits excellent corrosion resistance and oil resistance in cable materials, significantly extending the service life of the cable and improving its reliability in harsh environments.

[0016] Nitrile rubber (NBR) contains unsaturated double bonds and cyano groups (-CN) in its molecular structure, and has excellent oil resistance and wear resistance, so it is widely used in the preparation of cable materials. However, the compatibility of nitrile rubber with high molecular substrates such as polypropylene (PP) and polyethylene is poor, which limits its application in composite materials. To solve this problem, the compatibilizers selected in this invention are at least one of maleic anhydride grafted ethylene-propylene-diene monomer rubber (EPDM-g-MAH), methyl methacrylate grafted ethylene-propylene-diene monomer rubber (EPDM-g-MMA) or glycidyl methacrylate grafted ethylene-propylene-diene monomer rubber (EPDM-g-GMA). The molecular structures of these compatibilizers contain both non-polar EPDM segments and polar maleic anhydride groups, acrylic acid groups or glycidyl methacrylate groups. Among them, the EPDM segments have good compatibility with polypropylene (PP), while the polar groups (such as maleic anhydride groups) can interact with the cyano groups (-CN) in nitrile rubber (for example, form hydrogen bonds or chemical bonds). This dual compatibility enables the compatibilizer to form an effective "bridge" between PP and NBR, significantly reducing the interfacial tension and forming a flexible transition layer at the interface of PP and NBR. This transition layer can effectively transfer stress and prevent phase separation, thereby significantly improving the compatibility between polypropylene and nitrile rubber.

[0017] Polytetrafluoroethylene (PTFE) is a polymer with excellent oil resistance, chemical corrosion resistance and barrier properties, which can significantly improve the oil resistance and corrosion resistance of cable materials. However, the compatibility of PTFE with polypropylene (PP) is poor, which limits its application in cable materials. To solve this problem, this invention uses fluorine-containing elastomers such as vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, tetrafluoroethylene-propylene copolymer or tetrafluoroethylene-perfluoromethyl vinyl ether copolymer to replace polytetrafluoroethylene. These fluorine-containing elastomers not only have better compatibility with polypropylene, but also show significant advantages in terms of oil resistance and corrosion protection performance. In addition, they are also superior to polytetrafluoroethylene in terms of processing performance, flexibility and cost-effectiveness, thus playing more excellent comprehensive performance in cable materials.

[0018] In the selection of fillers, the present invention adopts a combination of montmorillonite with an average particle size of 0.1 - 1 μm and talcum powder with an average particle size of 10 - 40 μm. On the one hand, nano - scale montmorillonite can significantly increase the contact area between the filler and the polymer matrix, thereby improving the interfacial compatibility between polypropylene (PP) and nitrile - butadiene rubber (NBR). This improvement provides favorable conditions for the addition of large - particle - size talcum powder, enabling it to effectively improve the rigidity and dimensional stability of the material. By reasonably matching montmorillonite and talcum powder with different particle sizes, the mechanical properties and compatibility of the filling system can be further optimized. On the other hand, nano - scale montmorillonite particles can fill the tiny voids inside the material, forming a denser microstructure and reducing pores and defects. This dense structure can block the penetration path of oils and the diffusion channels of corrosive media, thus significantly improving the oil resistance and anti - corrosion performance of the cable material. Therefore, by scientifically selecting a combination of fillers with different particle sizes, not only can the compatibility between polypropylene and nitrile - butadiene rubber be significantly improved, but also significant advantages can be shown in terms of oil resistance and anti - corrosion performance, making it more suitable for use in harsh environments.

[0019] The present invention also provides a preparation method for an oil - resistant and corrosion - resistant cable sheath material for robots, which includes the following steps:

[0020] Mix each component evenly in proportion, melt - extrude in a twin - screw extruder, pelletize, and dry to obtain the oil - resistant and corrosion - resistant cable sheath material for robots.

[0021] Preferably, the extrusion temperature of the twin - screw extruder is 200 - 240 °C, the drying temperature is 70 - 100 °C, and the drying time is 1 - 3 h.

[0022] The present invention also includes an oil - resistant and corrosion - resistant cable, which includes an insulating core layer, a shielding layer, an inner protective layer, a strengthening layer, and an oil - resistant and corrosion - resistant sheath layer arranged on the outer periphery of the insulated wire core. The oil - resistant and corrosion - resistant sheath layer is prepared from the cable sheath material of the present invention.

[0023] Preferably, the present invention also provides the application of the above - mentioned oil - resistant and corrosion - resistant cable in the field of robots.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] An oil - resistant and corrosion - resistant cable sheath material for robots provided by the present invention has excellent properties such as oil resistance, acid - alkali corrosion resistance, salt penetration resistance, and wear resistance, and at the same time has mechanical properties such as high tensile strength and elongation at break, and is suitable for harsh environments such as underwater robots. Specific Embodiments

[0026] In order to better illustrate the purpose, technical solution and advantages of the present invention, the technical solution of the present invention is further described below through specific implementation methods. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0027] Unless otherwise specified, the materials, reagents, etc. used in the following examples and comparative examples are reagents and materials that can be obtained from commercial sources.

[0028] Experimental Materials:

[0029] UHMWPP-1: Borealis PP BA202E, weight average molecular weight is 102w, melt flow rate is 0.3 g / 10min at 230℃ and 2.16kg load.

[0030] UHMWPP-2, Formosa Plastics PP3003 from Taiwan, China, has a weight average molecular weight of 550,000 and a melt flow rate of 0.35 g / 10 min at 230°C and a load of 2.16 kg.

[0031] Polypropylene-3: BX3920, SK, Korea, with a melt flow rate of 100 g / 10 min at 230° C. and a load of 2.16 kg.

[0032] EPDM-g-MAH, Xi'an Qiyue Biotechnology Co., Ltd., China, maleic anhydride grafted EPDM, the grafting rate of maleic anhydride is 5.6%.

[0033] EPDM-g-GMA, Haiyi Polymer Materials Co., Ltd., Hangzhou, China, glycidyl methacrylate grafting rate 8.5%.

[0034] EPDM-g-MMA, Xi'an Ruixi Biotechnology Co., Ltd., China, methyl methacrylate grafted ethylene propylene diene monomer rubber.

[0035] Montmorillonite 1: average particle size is 0.1 μm; Montmorillonite 2: average particle size is 0.5 μm; Montmorillonite 3: average particle size is 1 μm.

[0036] Talc 1: average particle size is 10 μm; Talc 2: average particle size is 20 μm; Talc 3: average particle size is 30 μm; Talc 4: average particle size is 40 μm. Example

[0037] The components and weight proportions of the oil-resistant and corrosion-resistant robot cable sheath material involved in the embodiment are shown in Tables 1-3, wherein the preparation method of the oil-resistant and corrosion-resistant robot cable sheath material comprises the following steps:

[0038] (1) Weigh various raw materials according to the ratio;

[0039] (2) Add the above raw materials into a mixer and mix evenly to obtain a mixed material; add the obtained mixed material into a twin-screw extruder for extrusion granulation, and dry it at 80 °C for 2 h to obtain the cable sheath material. The temperatures of the twin-screw extruder from the feeding section to the head are as follows: 200 - 210 °C, 210 - 220 °C, 210 - 220 °C, 210 - 220 °C, 220 °C - 230, 220 - 230 °C, 230 - 240 °C, and the screw speed is 300 r / min.

[0040] Table 1 Component ratios (parts by weight) of Examples 1 - 7.

[0041]

[0042] Table 2 Component ratios (parts by weight) of Examples 8 - 16.

[0043]

[0044] Table 3 Component ratios (parts by weight) of Comparative Examples 1 - 7.

[0045]

[0046] Comparative Example 8

[0047] The difference from Example 1 is that the fluorine-containing elastomer is 2 parts, and other conditions are the same as those in Example 1.

[0048] Comparative Example 9

[0049] The difference from Example 1 is that the fluorine-containing elastomer is 20 parts, and other conditions are the same as those in Example 1.

[0050] Performance test

[0051] Conduct relevant performance tests on the oil-resistant and corrosion-resistant cable sheath materials prepared in the examples and comparative examples. The specific test methods are as follows:

[0052] (1) Evaluation of salt water resistance

[0053] Prepare a sodium chloride solution with a mass concentration of 3%, immerse the cable sheath materials of the examples and comparative examples in sodium chloride, place them in an oven at 100 °C for 96 h, and then test the change rate of tensile strength and the change rate of elongation at break. The test results are the average values of 5 tests.

[0054] (2) Evaluation of oil resistance

[0055] The sheath material samples of the examples and comparative examples were placed in an oven at 100 °C for 96 hours in a state of being immersed in IRM 902 oil, and then the tensile strength and elongation at break were measured, and the change rates of the corresponding tensile strength and elongation at break were calculated. Each group was tested 5 times and the average value was calculated.

[0056] (3)Acid / alkali resistance evaluation

[0057] The acid / alkali resistance was evaluated according to Standard EN 50306. For the acid resistance performance, the sheath layer samples of each example and comparative example were immersed in an oxalic acid aqueous solution with a concentration of 1 mol / L at room temperature for 168 hours, and then the elongation at break and tensile strength were measured, and the change rates of the corresponding tensile strength and elongation at break were calculated. Each group was tested 5 times and the average value was calculated.

[0058] For the alkali resistance performance, the sheath layer samples of each example and comparative example were immersed in a sodium hydroxide aqueous solution with a concentration of 1 mol / L at room temperature for 168 hours, and then the change rates of the elongation at break and tensile strength were measured. Each group was tested 5 times and the average value was calculated.

[0059] (4)Wear resistance evaluation

[0060] The mass wear test was carried out in accordance with the standard GB / T 3960-2016 "Test Method for Sliding Friction and Wear of Plastics", and the wear amount was calculated.

[0061] (5)Calculation method of change rate

[0062] Tensile strength test: The tensile strength of the polypropylene composition material was tested according to ISO 527-2012 "Test Method for Tensile Properties of Plastics", and the tensile rate was 50 mm / min. Tensile strength change rate = (tensile strength before impregnation - tensile strength after impregnation) / tensile strength before impregnation × 100%.

[0063] Elongation at break: Tested in accordance with ISO 527-1-2019: Test conditions: 23 °C. Elongation at break change rate = (elongation at break before impregnation - elongation at break after impregnation) / elongation at break before impregnation × 100%.

[0064] The test results of Examples 1-7 are shown in Table 4:

[0065]

[0066] The test results of Examples 8-16 are shown in Table 5:

[0067]

[0068] The test results of Comparative Examples 1-9 are shown in Table 6:

[0069]

[0070] According to the results in Table 4, the oil-resistant and corrosion-resistant cable material prepared by the present invention exhibits excellent mechanical properties, including high tensile strength and elongation at break. At the same time, the material also has good wear resistance, as well as excellent oil resistance, salt resistance and acid-base corrosion resistance. These characteristics enable it to remain stable in extreme environments and are an ideal choice for manufacturing the cable sheath material of underwater robots.

[0071] According to the test results of Examples 1 and 8-16 in Table 5, the present invention uses montmorillonite with an average particle size of 0.1-1 μm and talcum powder with an average particle size of 10-40 μm as a filler combination. Among them, nano-sized montmorillonite can significantly increase the contact area between the filler and the polymer matrix, thus providing better synergy for the addition of large-sized talcum powder and effectively improving the dimensional stability of the material. By reasonably matching montmorillonite and talcum powder with different particle sizes, the compatibility of the filling system can be optimized. Nano-sized montmorillonite particles can also fill the tiny voids inside the material to form a denser structure, reduce pores and defects, and then block the penetration path of oil and the diffusion channel of corrosive media, thereby significantly improving the oil resistance and anti-corrosion performance of the cable material. Further comparing Example 1 with Examples 13-16, it can be seen that when the average particle size of montmorillonite is further preferably 0.1-0.5 μm and used in combination with talcum powder with an average particle size of 10-40 μm, it can show more excellent effects in terms of oil resistance, acid-base corrosion resistance and salt resistance.

[0072] In Table 6, by comparing Example 1 and Comparative Example 1, it can be seen that Comparative Example 1 did not use ultra-high molecular weight polypropylene, but used ordinary molecular weight polypropylene as the base material. Therefore, the prepared cable sheath material shows poor performance in terms of corrosion resistance, oil resistance and salt resistance, and it is difficult to meet the long-term use requirements of cable materials in harsh environments.

[0073] From the comparison between Example 1 and Comparative Examples 2 - 4, it can be seen that the compatibilizers selected in the present invention are maleic anhydride grafted ethylene - propylene - diene monomer (EPDM), methyl methacrylate grafted ethylene - propylene - diene monomer or glycidyl methacrylate grafted ethylene - propylene - diene monomer. The molecular structures of these compatibilizers contain both non - polar EPDM segments and polar maleic anhydride groups, methyl methacrylate groups or glycidyl methacrylate groups. Among them, the EPDM segments have good compatibility with polypropylene (PP), while the polar groups (such as maleic anhydride groups) can interact with the cyano groups (-CN) in nitrile - butadiene rubber (NBR) (for example, forming hydrogen bonds or chemical bonds). This dual compatibility enables the compatibilizer to form an effective "bridge" between PP and NBR, significantly reducing the interfacial tension and forming a flexible transition layer at the interface between PP and NBR. This transition layer can effectively transfer stress and prevent phase separation, thus significantly improving the compatibility between PP and NBR. Macroscopically, it is manifested that the sheath material has better oil resistance, salt resistance and resistance to acid - base corrosion, making it more suitable for applications in harsh environments such as underwater robots.

[0074] From the comparison between Example 1 and Comparative Example 5, it can be seen that the compatibility between polytetrafluoroethylene used in Comparative Example 5 and polypropylene and nitrile - butadiene rubber is poor. During the processing, the dispersibility between the materials is not good, and it is difficult to form a uniform mixing system. In addition, although polytetrafluoroethylene has good chemical corrosion resistance, its oil resistance and resistance to acid - base corrosion are still lower than those of fluorine - containing elastomers. Therefore, the cable sheath material using polytetrafluoroethylene shows poor performance in terms of salt resistance, oil resistance and resistance to acid - base corrosion.

[0075] From the comparison between Example 1 and Comparative Examples 6 - 7, it can be seen that in Comparative Example 6, nitrile - butadiene rubber was not added, while in Comparative Example 7, fluorine - containing elastomer was not added. Due to the acrylonitrile units in its molecular structure, nitrile - butadiene rubber can interact with oil molecules, thereby reducing the swelling and erosion of oil on the rubber. Fluorine - containing elastomers show extremely high chemical stability to oil media due to the high electronegativity and strong bond energy of fluorine atoms in their molecular structures. By simultaneously introducing nitrile - butadiene rubber and fluorine - containing elastomer, the present invention utilizes their unique molecular structures and chemical properties to significantly improve the wear resistance, oil resistance and acid - base corrosion resistance of the cable sheath material.

[0076] According to the comparison between Example 1 and Comparative Examples 8-9: In Comparative Example 8, the insufficient amount of fluororubber led to a significant decrease in the wear resistance, salt resistance, acid and alkali resistance of the sheath material. This is because the insufficient chemical inertness and physical protection provided by the fluororubber reduced the durability of the sheath material in harsh environments. In Comparative Example 9, when the amount of fluororubber was too large, phase separation between the fluororubber and other materials was likely to occur, forming an uneven microstructure. This structure was not only easily eroded by acids, alkalis, salts and oils in the external environment, but also might lead to instability of the material properties. In addition, the fluororubber itself had relatively high viscosity and hardness. When the amount was too large, it would reduce the fluidity of the material during mixing and molding, affect the uniformity of the cable sheath, and might cause local stress concentration, further reducing the overall oil resistance, salt resistance, acid and alkali resistance of the sheath material. Therefore, the present invention reasonably adjusts the amount of fluororubber according to the specific use environment and performance requirements to achieve the best comprehensive performance balance.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that any modifications, equivalent substitutions or improvements made within the basic principles and scope of the present invention shall be regarded as belonging to the protection scope of the present invention.

Claims

1. An oil-resistant and corrosion-resistant cable sheath material for robots, characterized in that, The cable sheath material comprises the following raw materials in parts by weight: 80-100 parts of ultra-high molecular weight polypropylene, 30-50 parts of nitrile rubber, 5-10 parts of compatibilizer, 5-15 parts of fluorine-containing elastomer, 10-30 parts of filler, 1-5 parts of antioxidant, and 1-5 parts of lubricant; The compatibilizer is at least one of maleic anhydride grafted ethylene propylene diene monomer rubber, methyl methacrylate grafted ethylene propylene diene monomer rubber, and glycidyl methacrylate grafted ethylene propylene diene monomer rubber; The fluorine-containing elastomer includes at least one of vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, tetrafluoroethylene-propylene copolymer, and tetrafluoroethylene-perfluoromethyl vinyl ether copolymer.

2. The cable sheath material for oil-resistant and corrosion-resistant robots according to claim 1, characterized in that, The filler includes montmorillonite and talcum powder; the mass ratio of montmorillonite to talcum powder is 5-10:1-4.

3. The cable sheath material for oil-resistant and corrosion-resistant robots according to claim 2, characterized in that, The filler includes montmorillonite with an average particle size of 0.1-1 μm and talcum powder with an average particle size of 10-40 μm.

4. The cable sheath material for oil-resistant and corrosion-resistant robots according to claim 1, characterized in that The filler is prepared by modification with a coupling agent; the coupling agent includes at least one of γ-aminopropyltriethoxysilane, vinyltriethoxysilane, γ-glycidyletheroxypropyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

5. The cable sheath material for oil-resistant and corrosion-resistant robots according to claim 1, characterized in that The nitrile rubber is a powdered nitrile rubber with an acrylonitrile content of 25-35 wt%.

6. The cable sheath material for oil-resistant and corrosion-resistant robots according to claim 1, characterized in that The lubricant is selected from at least one of stearic acid, polyethylene wax, calcium stearate, and zinc stearate; the antioxidant includes at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1790, and antioxidant DLTDP.

7. The cable sheath material for oil-resistant and corrosion-resistant robots according to claim 1, characterized in that, The ultra-high molecular weight polypropylene resin has a weight average molecular weight of 500,000-1,200,000, the ultra-high molecular weight polypropylene is homopolypropylene or ethylene-propylene copolymer, and the melt flow rate of the ultra-high molecular weight polypropylene resin at 230 °C under a load of 2.16 kg is 0.1-15 g / 10 min.

8. A preparation method of an oil-resistant and corrosion-resistant cable sheath material for a robot as described in any one of claims 1-7, characterized in that, It includes the following steps: Mix each component evenly according to the ratio, melt and extrude in a twin-screw extruder, pelletize, and dry to obtain the cable sheath material for oil-resistant and corrosion-resistant robots.

9. The preparation method of the oil-resistant and corrosion-resistant cable sheath material for robots according to claim 8, characterized in that, The extrusion temperature of the twin-screw extruder is 200-240 °C, the drying temperature is 70-100 °C, and the drying time is 1-3 h.

10. An oil-resistant and corrosion-resistant cable, characterized in that, It includes an insulating core layer, a shielding layer, an inner protective layer, a strengthening layer, and an oil-resistant and corrosion-resistant sheath layer arranged on the outer periphery of the insulated wire core, and the oil-resistant and corrosion-resistant sheath layer is prepared from the cable sheath material according to any one of claims 1-7.

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