Wear-resistant and high-temperature-aging-resistant cable material for robot as well as preparation method and application of cable material

Abstract

The invention relates to a wear-resistant and high-temperature-aging-resistant cable material for a robot as well as a preparation method and application of the cable material. According to the cable material, the combination of the nano zinc oxide, the heat-resistant skeleton, the styrene-N-phenylmaleimide-maleic anhydride terpolymer and the polyurethane elastomer is introduced, so that the wear resistance, the heat aging resistance, the flexibility and the mechanical property of the material are remarkably improved. The cable material mainly comprises SEBS, EVA, a polyurethane elastomer, a heat-resistant skeleton, nano-zinc oxide, a terpolymer and other components, is suitable for a cable sheath material in a robot arm, and solves the problem that an existing cable material is insufficient in wear resistance and heat resistance in a high-temperature and frequent-friction environment by optimizing a material formula and a preparation process. The method is especially suitable for industrial robots and other harsh working environments.

Description

Technical Field

[0001] The present invention relates to a wear-resistant and aging-resistant cable material for robots. More specifically, the present invention relates to a cable material with excellent wear resistance, heat aging resistance, heat deformation resistance, and flexibility, and a preparation method and application thereof. Background Art

[0002] In recent years, with the rapid development of industrial robot technology, industrial robots have been increasingly widely used in fields such as manufacturing, logistics, and automobile manufacturing. As one of the core components of industrial robots, the cables of robot arms need to withstand frequent bending, stretching, high temperature, and friction in complex working environments. Therefore, the cables used in robot arms not only need to have excellent power and signal transmission capabilities, but also need to have good wear resistance, heat resistance, aging resistance, and flexibility. Existing cable materials often exhibit problems such as poor anti-interference performance, unstable data transmission, and poor wear resistance in complex environments such as high temperature, acid, and alkali. Especially in the reciprocating motion of automated equipment, the friction between the cable and the drag chain will cause increased wear of the cable, affecting its service life. To improve the wear resistance of the cable, manufacturers usually add inorganic fillers to the cable material. However, due to the compatibility problem between the inorganic filler and the organic polymer material (such as rubber), the improvement of the wear resistance of the material is limited. In addition, polyolefin materials (such as polyethylene and polypropylene) are commonly used polymer substrates for cable sheath materials, but polyolefin materials have poor heat resistance and are prone to thermal degradation at high temperatures, which limits their application in high-temperature environments.

[0003] In the prior art, the wear resistance and heat resistance of cable materials are mainly improved through the following methods: 1) Adding inorganic fillers: To improve the wear resistance of cables, researchers usually add a certain proportion of inorganic fillers to cable materials, such as silica, alumina, etc. However, the compatibility problem between inorganic fillers and organic polymer materials (such as polypropylene or polyethylene) has always been a technical challenge. Although inorganic fillers are added, due to their difficulty in achieving good compatibility with polymer materials, the improvement of the mechanical wear resistance of rubber materials is not significant. The existence of this problem makes the wear resistance, flexibility and bending resistance of drag chain cables still unable to meet the actual requirements in practical applications. 2) Use of heat-resistant modifiers: To improve the heat resistance of cable materials, researchers usually add heat-resistant modifiers, such as copper salts, nano-zinc oxide, etc. Copper salts may improve the thermal stability of materials by catalytic cross-linking, free radical capture or forming a barrier layer. For example, certain metal salts can promote polymer cross-linking to form a three-dimensional network structure, thereby enhancing thermal stability. In addition, copper ions may act as free radical scavengers to interrupt the degradation process of polymer chains. As an inorganic nano-material, nano-zinc oxide may delay thermal decomposition through a physical barrier effect, such as forming a protective layer on the material surface to slow down the penetration of heat and oxygen, or dispersing heat through its high thermal conductivity to reduce local overheating. 3) Adding heat-resistant polymer materials. To improve the comprehensive performance of cable materials, adding polymer materials such as polyurethane elastomers, styrene-N-phenylmaleimide-maleic anhydride terpolymers, polyimides, etc. can improve the wear resistance and heat resistance of cable sheath materials. Although the prior art has improved the wear resistance and heat resistance of cable materials to a certain extent, however, the existing technology still has the problem of insignificant improvement in heat resistance and wear resistance. Especially in an environment of high temperature and frequent friction, the performance of cable materials still cannot meet the requirements of industrial robots. Therefore, developing a cable sheath material with excellent wear resistance, heat resistance and flexibility has become an important direction in the research of cable materials for industrial robots currently.

[0004] In view of the above problems, the present invention provides a wear-resistant and high-temperature aging-resistant cable material for robots and its preparation method. By adding thermoplastic polyurethane, heat-resistant skeleton, nano-zinc oxide and styrene-N-phenylmaleimide-maleic anhydride terpolymer to the cable sheath material, the wear resistance, heat resistance and bending resistance of polyolefin materials are significantly improved, especially suitable for cables in robot arms, and can effectively meet the performance requirements in complex motion environments. Summary of the Invention

[0005] The present invention aims to solve the problem of poor abrasion resistance and heat aging resistance of existing polyolefin cable sheath materials, and provides a cable material suitable for robots. By introducing a combination of nano-zinc oxide, heat-resistant skeleton, styrene-N-phenylmaleimide-maleic anhydride terpolymer, and polyurethane elastomer, the abrasion resistance, heat resistance, flexibility, and mechanical properties of the cable material are significantly improved, and it is particularly suitable for the cable sheath material in the robot arm.

[0006] The present invention provides a wear-resistant and high-temperature aging-resistant cable material for robots, which comprises the following raw material components in parts by weight: 100 parts of hydrogenated styrene-butadiene-styrene block copolymer, 30-50 parts of ethylene-vinyl acetate copolymer, 10-20 parts of polyurethane elastomer, 1-5 parts of heat-resistant skeleton, 10-20 parts of nano-zinc oxide, 8-20 parts of styrene-N-phenylmaleimide-maleic anhydride terpolymer, 3-10 parts of compatibilizer, 1-5 parts of antioxidant, 1-5 parts of light stabilizer, and 1-5 parts of lubricant.

[0007] Preferably, the heat-resistant skeleton is an imidazole ester copper-loaded skeleton, and the synthesis method of the heat-resistant skeleton comprises the following steps: dropping an aqueous solution of benzimidazole into an aqueous solution of copper nitrate trihydrate under stirring and continuing to stir to obtain a solid suspension, centrifuging, washing, and drying to obtain the heat-resistant skeleton.

[0008] Preferably, the molar ratio of copper nitrate trihydrate to benzimidazole is 1:(10-50).

[0009] Preferably, the styrene content in the hydrogenated styrene-butadiene-styrene block copolymer is more than 30 wt%.

[0010] Preferably, the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 5-15 wt%, and the melt flow rate at 190 °C under a load of 2.16 kg is 0.1-15 g / 10 min.

[0011] Preferably, the polyurethane elastomer is a polyether-type polyurethane elastomer and a polyester-type polyurethane elastomer, and the mass ratio of the polyether-type polyurethane elastomer to the polyester-type polyurethane elastomer is 4-6:4-6.

[0012] Preferably, the average particle size of the nano-zinc oxide is 50-200 nm. Preferably, the nano-zinc oxide is prepared by surface modification with a coupling agent.

[0013] Preferably, the coupling agent comprises at least one of γ-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, γ-glycidyletheroxypropyltrimethoxysilane, and γ-methacryloxypropyltrimethoxysilane.

[0014] Preferably, the mass percentage content of N-phenyl maleimide in the styrene-N-phenyl maleimide-maleic anhydride terpolymer is 15-25%, and the mass percentage content of maleic anhydride is 8-15%.

[0015] Preferably, the compatibilizer is at least one of SEBS-g-MAH, EVA-g-MAH, PE-g-MAH, and PP-g-MAH. Further preferably, the compatibilizer is at least one of SEBS-g-MAH and EVA-g-MAH.

[0016] Preferably, the antioxidant of the present invention can be any one or a combination of at least two of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant DLTP, antioxidant DSTP, antioxidant 412S, and antioxidant 300.

[0017] Preferably, the light stabilizer is at least one of benzotriazoles, benzophenones, and triazines; further preferably, it is at least one of Tinuvin 326, UV-327, UV-328, Chimassorb 81, UV-531, and Cyasorb UV-1164.

[0018] Preferably, the lubricant is one or more of polyethylene wax, stearic acid, stearate, and silicone masterbatch.

[0019] Preferably, according to actual requirements, the present invention can add other reagents such as colorants, flame retardants, and hydrolysis-resistant agents.

[0020] The present invention uses SEBS (styrene-butadiene-styrene block copolymer) and EVA (ethylene-vinyl acetate copolymer) as the main raw materials, skillfully balancing the elasticity and rigidity of the material, thereby significantly improving the tensile strength and elongation at break of the cable compound. Among them, the polar groups contained in EVA not only enhance the mechanical properties of the material but also contribute to the uniform dispersion of additives such as antioxidants, light stabilizers, and heat-resistant agents (such as nano-zinc oxide and styrene-N-phenyl maleimide-maleic anhydride terpolymer). The optimization of this dispersion effect further improves the wear resistance and heat resistance of the cable compound, enabling it to maintain excellent mechanical properties and stability in harsh environments.

[0021] The present invention selects an imidazole ester - supported copper skeleton as the heat - resistant skeleton. On the one hand, the copper ions contained therein can capture free radicals (such as alkyl free radicals R·) generated during the high - temperature thermal degradation of polyolefins through redox reactions, thereby interrupting the chain reaction and delaying the thermal oxidative degradation of the material. On the other hand, this heat - resistant skeleton can adsorb nano - zinc oxide, and nano - zinc oxide not only has excellent ultraviolet absorption ability but also good wear - resistant performance. Adsorbing on the heat - resistant skeleton is conducive to its dispersion in the cable compound, further improving the wear resistance and heat resistance of the cable compound. In addition, compared with alkyl imidazoles such as 2 - methylimidazole and 2 - ethylimidazole, the present invention uses benzimidazole containing a phenyl group. The introduction of the phenyl structure endows the heat - resistant skeleton with more excellent heat - resistant performance.

[0022] The present invention also adds a styrene - N - phenylmaleimide - maleic anhydride terpolymer. It not only has good heat resistance and can further improve the heat resistance and rigidity of the cable compound, but also contains polar maleic anhydride groups, which helps the dispersion of nano - zinc oxide in the system. More preferably, the present invention uses nano - zinc oxide surface - modified by a coupling agent. In the molten state, the silane coupling agent on the surface of nano - zinc oxide can undergo a micro - crosslinking reaction with the maleic anhydride comonomer in the terpolymer and form a physically entangled network structure with the imidazole ester - supported copper skeleton that adsorbs nano - zinc oxide. This makes the comprehensive properties such as the heat resistance and mechanical properties of the cable compound more excellent.

[0023] The present invention adopts a combination of polyether - type polyurethane elastomer and polyester - type polyurethane elastomer. The polyester - type polyurethane elastomer has excellent mechanical properties but slightly inferior flexibility; while the polyether - type polyurethane elastomer has a lower cohesive energy of the ether bond in the molecular structure and is easy to rotate, so it can still maintain flexibility at low temperatures, and at the same time has good wear resistance and heat resistance, but its mechanical properties are inferior to those of the polyester - type polyurethane elastomer. By combining the two in a ratio of 4 - 6∶4 - 6, the present invention not only ensures good mechanical properties of the cable compound but also takes into account excellent wear resistance, heat resistance and flexibility.

[0024] The present invention also provides a preparation method for a wear - resistant and high - temperature - aging - resistant cable compound for robots, including the following steps: Mix each component evenly according to the ratio, melt - extrude, pelletize and dry in a twin - screw extruder to obtain a wear - resistant and high - temperature - aging - resistant cable compound for robots.

[0025] Preferably, the extrusion temperature of the twin - screw extruder is 180 - 220 °C, the drying temperature is 70 - 100 °C, and the drying time is 1 - 3 h.

[0026] The present invention also includes a wear - resistant and high - temperature - aging - resistant cable, including a central conductor, an insulating layer, a shielding layer and a sheath layer, and the sheath layer is prepared from the wear - resistant and high - temperature - aging - resistant cable compound of the present invention.

[0027] Preferably, the present invention also provides an application of the above-mentioned wear-resistant and high-temperature aging-resistant cable in the field of robots.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The wear-resistant and high-temperature aging-resistant cable material for robots provided by the present invention not only has excellent wear resistance and heat resistance, but also has excellent mechanical properties such as high tensile strength and elongation at break, and is therefore particularly suitable for the cable sheath material in the robot arm. Specific embodiments

[0030] To better illustrate the purpose, technical solution and advantages of the present invention, the technical solution of the present invention will be further described below through specific embodiments. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the patent protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0031] The materials, reagents, etc. used in the following examples and comparative examples are commercially available reagents and materials unless otherwise specified.

[0032] SEBS-1: The polystyrene content is 30 wt%, Kraton G1654.

[0033] SEBS-2: The polystyrene content is 40 wt%, Kraton A1536.

[0034] SEBS-3: The polystyrene content is 50 wt%, Asahi Kasei L518.

[0035] SEBS-4: The polystyrene content is 60 wt%, Kraton A1537.

[0036] Styrene-(N-phenylmaleimide)-maleic anhydride terpolymer, HW-320 produced by Shanghai Huawei, the content of maleic anhydride is 10%, and the weight percentage content of N-phenylmaleimide is 20%.

[0037] EVA-1: The melt flow rate at 190 °C under a load of 2.16 kg is 2.5 g / 10 min, the VA content is 12 wt%, DuPont 3130.

[0038] EVA-2: The melt flow rate at 190 °C and 2.16 kg is 10 g / 10 min, the VA content is 14%, Beijing Organic, EVA 14-2.

[0039] Polyether-based polyurethane elastomer TPU-1: 1085A, BASF, Germany.

[0040] Polyether-based polyurethane elastomer TPU-2: 2102-90AE, Dow Chemical, USA.

[0041] Polyester-based polyurethane elastomer TPU-3: IT70AU, Bayer, Germany.

[0042] Polyester-based polyurethane elastomer TPU-4: 5377A, Covestro, Germany.

[0043] Nano zinc oxide-1: The average particle size is 100 nm.

[0044] Nano zinc oxide-2: The average particle size is 200 nm.

[0045] Nano zinc oxide-3: The average particle size is 100 nm, prepared by surface modification with vinyltriethoxysilane.

[0046] Nano zinc oxide-4: The average particle size is 100 nm, prepared by surface modification with γ-aminopropyltriethoxysilane. Examples

[0047] The preparation method of heat-resistant framework 1 is as follows:

[0048] Step 1), dissolve benzimidazole in water at 70 °C to prepare a 0.5 mol / L benzimidazole solution; dissolve copper nitrate trihydrate in water at 50 °C to prepare a 0.3 mol / L copper nitrate trihydrate solution;

[0049] Step 2), set the stirring rate to 500 r / min, and drop the benzimidazole solution into the copper nitrate trihydrate solution at a dropping rate of 50 mL / min. Continue to stir at 50 °C for 4 h to obtain a solid suspension. After centrifugation, wash it with deionized water 3 times, and place it in a vacuum drying oven at 45 °C for 10 h to obtain heat-resistant framework 1. The molar ratio of copper nitrate trihydrate to benzimidazole is 1:10.

[0050] The preparation method of heat-resistant framework 2 is as follows:

[0051] Step 1), dissolve benzimidazole in water at 60 °C to prepare a 0.2 mol / L benzimidazole solution; dissolve copper nitrate trihydrate in water at 50 °C to prepare a 0.4 mol / L copper nitrate trihydrate solution;

[0052] Step 2), set the stirring rate to 800 r / min, and drop the benzimidazole solution into the copper nitrate trihydrate solution at a dropping rate of 40 mL / min. Continue to stir at 50 °C for 3 h to obtain a solid suspension. After centrifugation, wash it with deionized water 3 times, and place it in a vacuum drying oven at 50 °C for 10 h to obtain heat-resistant framework 2. The molar ratio of copper nitrate trihydrate to benzimidazole is 1:30.

[0053] The preparation method of the heat-resistant framework 3 is as follows:

[0054] Step 1), dissolve benzimidazole in water at 60 °C to prepare a 0.1 mol / L benzimidazole solution; dissolve copper nitrate trihydrate in water at 60 °C to prepare a 0.5 mol / L copper nitrate trihydrate solution;

[0055] Step 2), set the stirring rate to 700 r / min, drop the benzimidazole solution into the copper nitrate trihydrate solution at a dropping rate of 60 mL / min, continue stirring at 40 °C for 4 h to obtain a solid suspension, wash it 3 times with deionized water after centrifugation, and place it in a vacuum drying oven at 50 °C for drying for 10 h to obtain the heat-resistant framework 3. The molar ratio of copper nitrate trihydrate to benzimidazole is 1:50.

[0056] The preparation method of the heat-resistant framework 4 is as follows:

[0057] Step 1), dissolve 2-methylimidazole in water at 70 °C to prepare a 0.5 mol / L 2-methylimidazole solution; dissolve copper nitrate trihydrate in water at 50 °C to prepare a 0.3 mol / L copper nitrate trihydrate solution;

[0058] Step 2), set the stirring rate to 500 r / min, drop the 2-methylimidazole solution into the copper nitrate trihydrate solution at a dropping rate of 50 mL / min, continue stirring at 50 °C for 4 h to obtain a solid suspension, wash it 3 times with deionized water after centrifugation, and place it in a vacuum drying oven at 45 °C for drying for 10 h to obtain the heat-resistant framework 4. The molar ratio of copper nitrate trihydrate to 2-methylimidazole is 1:10.

[0059] The components and weight parts of the wear-resistant, high-temperature-resistant and aging-resistant cable sheath material for robots involved in the examples and comparative examples are shown in Table 1-2. Among them, the preparation method of the wear-resistant, high-temperature-resistant and aging-resistant cable sheath material for robots includes the following steps:

[0060] (1) Weigh various raw materials according to the ratio;

[0061] (2) Add the above raw materials into a mixer and mix them 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 successively: 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 200 r / min.

[0062] Table 1 Component ratios (weight parts) of Examples 1-10.

[0063] Example 11

[0064] Use nano-zinc oxide-3 instead of nano-zinc oxide-1, and other conditions are the same as those in Example 1. Example 12

[0065] Use nano-zinc oxide-4 instead of nano-zinc oxide-1, and other conditions are the same as those in Example 1.

[0066] Table 2 shows the component ratios (parts by weight) of Comparative Examples 1-10.

[0067]

[0068] Comparative Example 11

[0069] Use 3 parts by weight of copper oxide instead of the heat-resistant skeleton 1, and other conditions are the same as those in Example 1.

[0070] Performance Test

[0071] : Conduct relevant performance tests on the wear-resistant, high-temperature aging cable sheath materials for robots prepared in the examples and comparative examples. The specific test methods are as follows:

[0072] (1) Evaluation of wear resistance Conduct mass wear tests in accordance with the standard GB / T 3960-2016 "Test Method for Sliding Friction and Wear of Plastics" and calculate the wear amount.

[0073] (2) Heat distortion temperature

[0074] Heat distortion temperature: According to the test standard ISO75-2-2013, the test condition is 1.80 MPa.

[0075] (3) Heat-resistant aging performance

[0076] After aging the sheath layer samples prepared according to each example and comparative example at 150 °C for 200 hours, measure the elongation at break and tensile strength, calculate the change rates of the corresponding tensile strength and elongation at break, and calculate the average value for each group with 5 tests.

[0077] Calculation method of change rate

[0078] Tensile strength test: Use ISO 527-2012 "Test Method for Tensile Properties of Plastics" to test the tensile strength of the polypropylene composition material, and the tensile rate is 50 mm / min. Tensile strength change rate = (tensile strength before immersion - tensile strength after immersion) / tensile strength before immersion × 100%.

[0079] Elongation at break: Tested in accordance with ISO 527-1-2019: Test conditions: 23°C. Rate of change of elongation at break = (Elongation at break before immersion - Elongation at break after immersion) / Elongation at break before immersion × 100%.

[0080] (4)Flexural fatigue test

[0081] The sample is injection molded into a spline with a length * width * thickness of 100 mm * 100 mm * 1.5 mm, and is bent back and forth 100 times at 180 degrees at 25°C. Observe whether there are cracks and whitening at the bent part. If there are no cracks and no whitening at the bent part, it is recorded as qualified, and others are recorded as unqualified.

[0082] The performance test results of the examples and comparative examples are shown in Table 3 below:

[0083]

[0084] By analyzing the performance test results of Examples 1-12 and Comparative Examples 1-11 recorded in Table 3, the following conclusions can be drawn.

[0085] 1. By introducing a combination of nano-zinc oxide, heat-resistant skeleton, styrene-(N-phenylmaleimide)-maleic anhydride terpolymer, and polyurethane elastomer into the SEBS and EVA substrates, the present invention not only has excellent mechanical properties such as high tensile strength and elongation at break, but also has excellent wear resistance, heat aging resistance, and flexibility, and is particularly suitable for cable sheath materials in robot arms.

[0086] 2. Comparing Example 1 with Examples 11-12, it can be seen that Examples 11-12 used silane-coupled nano-zinc oxide. The cable sheath materials prepared in Examples 11-12 are significantly superior to Example 1 in terms of wear resistance, heat aging resistance, heat distortion temperature, and flexibility. It may be that in the molten state, the silane coupling agent on the surface of nano-zinc oxide can undergo a micro-crosslinking reaction with the maleic anhydride comonomer in the terpolymer, and form a physically entangled network structure with the imidazole ester copper-loaded skeleton adsorbing nano-zinc oxide, making the comprehensive performance of the cable sheath material more excellent.

[0087] 3. Comparing Example 1 with Comparative Example 1, it can be found that Comparative Example 1 used 2-methylimidazole to replace benzimidazole in Example 1. Although it meets the flexural fatigue performance requirements, there are differences in heat resistance. The phenyl-containing benzimidazole structure in Example 1 improves the heat resistance of the heat-resistant skeleton. In contrast, the heat-resistant skeleton in Comparative Example 1 does not contain a benzene ring and is easily decomposed at high temperatures, resulting in the aggregation of heat-resistant agents such as loaded nano-zinc oxide in the polymer system, thereby reducing the heat aging resistance and heat distortion temperature.

[0088] Comparing Example 1 with Comparative Examples 2-5, it can be found that in Example 1, a combination of polyether-based polyurethane elastomer and polyester-based polyurethane elastomer was used, and the mass ratio of the two was close to 1:1 (4-6:4-6). This mass ratio combination takes into account the flexibility and wear resistance of the material while ensuring the mechanical properties of the material, and gives full play to the respective advantages of the polyether-based polyurethane elastomer and the polyester-based polyurethane elastomer. In Comparative Examples 2-5, this mass ratio combination was not used or a single type of polyurethane elastomer was used, resulting in a significant decrease in the flexibility and bending resistance of the material.

[0089] 4. Comparing Example 1 with Comparative Examples 6-7, it can be found that in Comparative Example 6, the amount of heat-resistant skeleton used was too much, resulting in the easy aggregation of its skeleton particles in the composite material to form aggregates, which in turn became the concentration points of thermal stress. This made the material more likely to generate microcracks in a high-temperature environment, ultimately leading to a decrease in the heat resistance and heat aging resistance of the composite material. In Comparative Example 7, the amount of heat-resistant skeleton used was insufficient, making the nano-zinc oxide filler with heat resistance performance unable to be well dispersed in the heat-resistant skeleton, resulting in poor dispersion of nano-zinc oxide, and further causing a decrease in the heat aging resistance and heat distortion temperature of the cable sheath material.

[0090] From the comparison between Example 1 and Comparative Examples 8-10, it can be seen that in Comparative Example 8, nano-zinc oxide was omitted, in Comparative Example 9, the heat-resistant skeleton was omitted, and in Comparative Example 10, the styrene-(N-phenylmaleimide)-maleic anhydride terpolymer was omitted. The heat distortion temperature and the retention rates of the tensile strength change rate and the elongation at break change rate after heat treatment in Comparative Examples 8-10 decreased significantly. That is, the combination of using nano-zinc oxide, heat-resistant skeleton and styrene-(N-phenylmaleimide)-maleic anhydride terpolymer significantly improved the heat resistance of the cable sheath material.

[0091] In Comparative Example 11, copper oxide was used to replace the imidazole ester copper-carrying skeleton. Although copper oxide can provide a relatively good heat distortion temperature to a certain extent, its dispersion in the composite material is poor, and it cannot be used as a carrier for nano-zinc oxide. This also leads to poor dispersion of nano-zinc oxide in the composite material system, and further causes a significant decrease in the retention rates of tensile strength and elongation at break and wear resistance of the material after high-temperature aging.

[0092] The above examples are only examples provided to illustrate the present invention and are not limitations on the possible implementation modes of the present invention. Based on the content disclosed in the present invention, those skilled in the relevant art can make various forms of modifications and adjustments. It is impossible and unnecessary to list all possible implementation modes. Any modification, equivalent substitution or improvement 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. A wear-resistant and high temperature resistant cable material for robots, characterized in that: The cable material comprises the following raw materials in parts by weight: 100 parts of hydrogenated styrene-butadiene-styrene block copolymer, 30-50 parts of ethylene-vinyl acetate copolymer, 10-20 parts of polyurethane elastomer, 1-5 parts of heat-resistant skeleton, 10-20 parts of nano zinc dioxide, 8-20 parts of styrene-N-phenylmaleimide-maleic anhydride terpolymer, 3-10 parts of compatibilizer, 1-5 parts of antioxidant, 1-5 parts of light stabilizer, and 1-5 parts of lubricant; The polyurethane elastomer is a polyether polyurethane elastomer and a polyester polyurethane elastomer, wherein the mass ratio of the polyether polyurethane elastomer to the polyester polyurethane elastomer is 4-6:4-6; The synthesis method of the heat-resistant skeleton comprises the following steps: adding a benzimidazole aqueous solution dropwise to a copper nitrate trihydrate aqueous solution under stirring and continuing stirring to obtain a solid suspension, centrifuging, washing and drying to obtain a heat-resistant skeleton.

2. The wear-resistant and high-temperature-resistant cable material for robots according to claim 1, characterized in that: The molar ratio of the copper nitrate trihydrate to benzimidazole is 1:(10-50).

3. The wear-resistant and high-temperature-resistant aging cable material for robots according to claim 1, characterized in that: The hydrogenated styrene-butadiene-styrene block copolymer has a styrene content of more than 30 wt %; the mass percentage of N-phenylmaleimide in the styrene-N-phenylmaleimide-maleic anhydride terpolymer is 15-25%, and the mass percentage of maleic anhydride is 8-15%; the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 5-15 wt %, and the melt flow rate at 190° C. and 2.16 kg load is 0.1-15 g / 10 min.

4. The wear-resistant and high-temperature-resistant aging cable material for robots according to claim 1, characterized in that: The average particle size of nano zinc oxide is 50-200nm.

5. The wear-resistant and high temperature aging-resistant cable material for robots according to any one of claims 1 to 4, characterized in that: The nano zinc oxide is prepared by surface modification using a coupling agent, wherein the coupling agent comprises at least one of gamma-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, gamma-glycidyloxypropyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane.

6. The wear-resistant and high-temperature-resistant aging cable material for robots according to claim 1, characterized in that: The compatibilizer is at least one of SEBS-g-MAH, EVA-g-MAH, PE-g-MAH, and PP-g-MAH.

7. The wear-resistant and high-temperature-resistant aging cable material for robots according to claim 1, characterized in that: The antioxidant is any one of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant DLTP, antioxidant DSTP, antioxidant 412S, and antioxidant 300, or a combination of at least two of them; the light stabilizer is at least one of benzotriazoles, benzophenones, and triazines; and the lubricant is at least one of polyethylene wax, stearic acid, stearate, and silicone masterbatch.

8. A method for preparing the wear-resistant and high temperature aging-resistant cable material for robots as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: The components are mixed evenly in proportion, melt-extruded in a twin-screw extruder, granulated, and dried to obtain wear-resistant, high-temperature-resistant, and aging-resistant cable materials for robots.

9. The method for preparing the wear-resistant and high-temperature-resistant aging cable material for robots according to claim 8, characterized in that: The extrusion temperature of the twin-screw extruder is 180-220° C., the drying temperature is 70-100° C., and the drying time is 1-3 hours.

10. A wear-resistant and high-temperature resistant cable for robots, characterized in that: The cable comprises a central conductor, an insulating layer, a shielding layer and a sheath layer, wherein the sheath layer is made of the wear-resistant, high-temperature and aging-resistant cable material according to any one of claims 1 to 7.

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