Corrosion-resistant robot cable and process for processing same
By using cross-linked polyethylene matrix in robot cables in a synergistic composite with graphene corrosion-resistant microcapsules and skeleton fillers, the problem of insulation performance degradation in traditional robot cables under strong corrosive environments has been solved, and durability and corrosion resistance have been improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ECHU SPECIAL WIRE & CABLE KUNSHAN CO LTD
- Filing Date
- 2026-04-30
- Publication Date
- 2026-06-30
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This application relates to the field of manufacturing and processing robot cables, and in particular to a corrosion-resistant robot cable and its processing technology. Background Technology
[0002] With the rapid iteration of industrial automation and intelligent manufacturing, industrial robots, leveraging their high efficiency, are widely deployed in demanding environments such as chemical engineering, metallurgy, marine engineering, and wastewater treatment, becoming core equipment in industrial production. Robot cables, as crucial carriers for power transmission and signal interaction, directly impact the robot's operational stability, safety, and overall lifespan, making them a core component ensuring long-term robot operation.
[0003] Currently, the outer sheath of traditional robot cables is mostly made of ordinary polyethylene or general-purpose elastomer materials. While these materials can meet the insulation requirements under normal operating conditions, they are highly susceptible to molecular chain degradation and microcracks in the sheath due to long-term exposure to chemical reagents or high-humidity salt spray environments. Once the sheath suffers microscopic damage, corrosive media can rapidly penetrate the interior along the interface, leading to oxidation of the shielding layer, a decrease in insulation resistance, and ultimately signal interruption or short circuit. Cross-linked polyethylene (XLPE), due to its excellent heat resistance, insulation properties, and mechanical strength, is widely used as the insulation layer and sheath matrix material for power cables. However, in highly corrosive environments such as chemical and marine engineering, traditional XLPE materials still face the challenge of insufficient resistance to chemical erosion. During long-term service, insulation performance deteriorates due to media penetration, limiting its application in the field of specialized robot cables. Summary of the Invention
[0004] To improve the corrosion resistance of robot cables, this application provides a corrosion-resistant robot cable and its processing technology.
[0005] Firstly, this application provides a corrosion-resistant robot cable, which adopts the following technical solution: A corrosion-resistant robot cable includes a cross-linked polyethylene (XLPE) insulation sheath and a cable core, wherein the XLPE insulation sheath comprises the following components in parts by weight: Low-density polyethylene 70-80 parts, cross-linked polyethylene 95-105 parts, ethylene-vinyl acetate copolymer 12-18 parts, graphene corrosion-resistant microcapsules 8-12 parts, skeleton filler 6-8 parts, cross-linking agent 1.8-2.2 parts, corrosion-resistant additive 10-14 parts, antioxidant 0.3-0.5 parts, light stabilizer 0.2-0.4 parts, lubricant 0.15-0.25 parts, carbon black 2-3 parts; The raw materials for the graphene corrosion-resistant microcapsules include graphene oxide, p-phenylenediamine, and a corrosion resistant agent.
[0006] By employing the above-mentioned technical solution, using cross-linked polyethylene as the cable matrix and incorporating a corrosion-resistant functional system, a corrosion-resistant cable is prepared. The graphene corrosion-resistant microcapsules utilize graphene oxide as the wall material. Graphene oxide, as a two-dimensional nanomaterial, possesses an extremely high diameter-to-thickness ratio. After uniform dispersion, it significantly extends the penetration path of water, oxygen, and corrosive ions, enhancing the physical barrier properties of the sheath. After modification with p-phenylenediamine, a cross-linked structure forms between the graphene oxide sheets, further strengthening the density and chemical stability of the capsule wall. The corrosion-resistant agent loaded in the capsule core can be actively released when microcracks appear in the sheath, migrating to the damaged area to form a passivation film, achieving active corrosion protection.
[0007] Preferably, the graphene-resistant microcapsules are prepared by the following method: Anhydrous ethanol, graphene oxide, and p-phenylenediamine were mixed and refluxed in an oil bath. The resulting solid was then centrifuged, washed, and dried sequentially to obtain p-phenylenediamine composite graphene oxide. Aniline was mixed with toluene to obtain an aniline solution. The p-phenylenediamine composite graphene oxide, a corrosion resistant agent, and water were mixed to obtain a mixed solution. The aniline solution and the mixed solution were mixed and stirred to obtain a composite solution. Ammonium persulfate and hydrochloric acid were mixed and added to the composite solution. The mixture was stirred, centrifuged, and dried to obtain graphene corrosion resistant microcapsules.
[0008] By adopting the above technical solution, p-phenylenediamine is used as a crosslinking agent to enhance the connection between graphene oxide sheets, forming a denser two-dimensional network structure, improving the physical barrier performance, and the introduced amino groups provide abundant reactive sites for the subsequent in-situ polymerization of polyaniline. The amino and benzene ring structures on the surface of the polyaniline layer provide abundant active sites for forming hydrogen bonds and π-π interactions with the surface of the skeleton filler, enhancing the anchoring effect of microcapsules on the surface of the skeleton filler.
[0009] Preferably, the corrosion resistant agent includes 8-hydroxyquinoline.
[0010] By adopting the above technical solution, after the release of 8-hydroxyquinoline, part of it can be adsorbed and stored by the porous structure of the framework packing, thus achieving secondary sustained release; at the same time, the coordination between the metal nodes (such as Cu²⁺) in the framework packing and 8-hydroxyquinoline can further enhance the adsorption stability.
[0011] Preferably, the mass ratio of graphene oxide to p-phenylenediamine is 1:(0.5-0.7).
[0012] By adopting the above technical solution, and preferably within the above-mentioned range the mass ratio of graphene oxide to p-phenylenediamine, p-phenylenediamine can fully bond with graphene oxide, disperse the graphene oxide sheets, and improve the corrosion resistance of the prepared graphene corrosion microcapsules.
[0013] Preferably, the mass ratio of the p-phenylenediamine composite graphene oxide to 8-hydroxyquinoline is 1:(2.6-3.6).
[0014] By adopting the above technical solution, the mass ratio between p-phenylenediamine composite graphene oxide and 8-hydroxyquinoline is preferably within the above range, so that 8-hydroxyquinoline is in a saturated loading state, and slow release is achieved by relying on the polyaniline coating layer. This, together with the adsorption function of the skeleton filler, forms a synergy between release and adsorption, thus extending the overall anti-corrosion cycle.
[0015] Preferably, the raw materials for preparing the skeleton filler include skeleton material, 2-mercaptobenzimidazole and 2-methylimidazole.
[0016] By adopting the above technical solution, a three-dimensional porous structure is provided with a cobalt-based metal-organic framework as the core, serving as a physical support and adsorption carrier. A zeolite imidazole ester framework shell is grown in situ on the surface of the framework material. The imidazole groups can increase the crosslinking density with the matrix. The imidazole groups of the zeolite imidazole ester framework material can form hydrogen bonds and π-π interactions with the oxygen-containing functional groups of polyaniline and graphene oxide on the surface of the microcapsules, enhancing the interfacial bonding between the framework filler and the microcapsules and achieving uniform dispersion of the functional filler.
[0017] Preferably, the skeleton filler is prepared by the following method: Cobalt nitrate hexahydrate, terephthalic acid, water, ammonium formate, and ethanol were mixed, stirred, and polyvinylpyrrolidone was added and stirred. The mixture was heated to react, then cooled, washed, and freeze-dried to obtain the framework material. The framework material was mixed with methanol to obtain a framework material dispersion. 2-methylimidazole was mixed with methanol to obtain a 2-methylimidazole dispersion. Cobalt nitrate hexahydrate was mixed with methanol to obtain a cobalt nitrate hexahydrate dispersion. 2-Mercaptobenzimidazole was mixed with methanol and added to the cobalt nitrate hexahydrate dispersion, then added to the framework material dispersion. After stirring, 2-methylimidazole was added. After stirring, the mixture was centrifuged, washed, and freeze-dried to obtain the framework filler.
[0018] By adopting the above technical solution, the prepared skeleton filler has a multi-layer structure. The core provides structural support for the skeleton material, the middle layer of zeolite imidazole ester skeleton serves as a nano-container, and 2-mercaptobenzimidazole corrosion inhibitor is loaded in the pores, which significantly improves the corrosion resistance of the system.
[0019] Preferably, the mass ratio of cobalt nitrate hexahydrate to terephthalic acid is 1:(1.6-1.8).
[0020] By adopting the above technical solution, the mass ratio between cobalt nitrate hexahydrate and terephthalic acid is preferably within the above range, so that cobalt nitrate hexahydrate and terephthalic acid are fully coordinated to form a skeleton material with moderate porosity and stable structure. The adsorption capacity of its porous structure is matched with the blocking efficiency of the microcapsules. The microcapsules block most of the corrosive media, while the skeleton material adsorbs a small amount of permeating media, thus synergistically improving the corrosion resistance of the cable. Furthermore, the regular porous skeleton, combined with the microcapsules and the cable substrate, forms a three-dimensional support network, which improves the tensile strength and impact resistance of the cable.
[0021] Preferably, the mass ratio of cobalt nitrate hexahydrate, the framework material, and 2-mercaptobenzimidazole is 1:0.15:(0.7-0.8).
[0022] By adopting the above technical solution, and preferably within the above range the mass ratio of cobalt nitrate hexahydrate, the framework material and 2-mercaptobenzimidazole, the prepared framework filler has a moderate shell thickness, the loading rate is improved, and 2-mercaptobenzimidazole is uniformly distributed in the pores.
[0023] Secondly, this application provides a processing technology for corrosion-resistant robot cables, employing the following technical solution: A processing technology for a corrosion-resistant robot cable includes the following steps: Low-density polyethylene, cross-linked polyethylene, and ethylene-vinyl acetate copolymer are mixed in an intensive mixing process. Then, carbon black, antioxidants, light stabilizers, and lubricants are added, and the mixing continues. Cross-linking agents, graphene corrosion-resistant microcapsules, corrosion-resistant additives, and skeleton fillers are added. After intensive mixing, the material is discharged to obtain a sheath material. The sheath material is added to a single-screw extruder, and the cable core is passed through the extruder die head so that the sheath material is evenly coated on the surface of the cable core to obtain a cross-linked polyethylene insulation sheath. Then, it is sent to a vulcanization pipeline for vulcanization. After cooling, a corrosion-resistant robot cable is obtained.
[0024] In summary, this application includes at least one of the following beneficial technical effects: Using cross-linked polyethylene as the matrix, combined with functional systems such as graphene corrosion-resistant microcapsules, graphene oxide extends the penetration path of corrosive media, and the p-phenylenediamine modification enhances the density of the capsule wall. The corrosion-resistant agent in the capsule core is actively released to form a passivation film, achieving a combination of physical barrier and active corrosion protection. Crosslinking p-phenylenediamine with graphene oxide enhances barrier properties, provides active sites for polyaniline polymerization, strengthens the interaction with the framework filler, and improves the microcapsule anchoring effect and dispersion stability. A novel framework filler, prepared from a framework material, 2-mercaptobenzimidazole, and 2-methylimidazole, forms a synergistic composite system with graphene corrosion-resistant microcapsules. Specifically, 2-mercaptobenzimidazole can form a stable chelate structure with metal ions, achieving active corrosion inhibition; 2-methylimidazole constructs a stable coordination framework, enhancing the filler's structural strength and resistance to various media. Detailed Implementation
[0025] The present application will be further described in detail below with reference to the embodiments: Raw material description: All raw materials in the examples are commercially available; the crosslinking agent is dicumyl peroxide, the corrosion resistant additive is chlorinated polyethylene (CAS No.: 63231-66-3), the antioxidant is antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1, the light stabilizer is UV-531 (CAS No.: 1843-05-6), and the lubricant is stearic acid (CAS No.: 57-11-4). Example 1
[0026] Preparation of graphene corrosion-resistant microcapsules: 200g of anhydrous ethanol, 10g of graphene oxide, and 5g of p-phenylenediamine (CAS No.: 106-50-3) were mixed and refluxed in an oil bath at 70℃ for 10h. The resulting solid was then centrifuged at 3000rpm, washed with deionized water, and dried at 50℃ for 3h to obtain p-phenylenediamine composite graphene oxide. 22g of aniline (CAS No.: 62-53-3) was mixed with 120g of toluene to obtain an aniline solution. 8.33g of p-phenylenediamine composite graphene oxide was then... 21.67 g of 8-hydroxyquinoline (CAS No.: 148-24-3) was added to 200 g of deionized water to obtain a mixture. Aniline solution was added to the mixture, and the mixture was stirred at 600 rpm for 12 h at 1 °C to obtain a composite solution. 30 g of ammonium persulfate was added to 80 ml of 1 mol / L hydrochloric acid, and then added to the composite solution using a separatory funnel. The mixture was stirred at 900 rpm for 6 h, then centrifuged, and dried at 60 °C for 12 h to obtain graphene corrosion-resistant microcapsules.
[0027] Preparation of framework filler: 11.54 g of cobalt nitrate hexahydrate, 18.46 g of terephthalic acid (CAS No.: 100-21-0), 100 g of deionized water, 100 g of dimethylformamide (CAS No.: 68-12-2), and 100 g of ethanol were mixed and stirred at 600 rpm for 30 min. Then, 10 g of polyvinylpyrrolidone (CAS No.: 9003-39-8) was added, and the mixture was stirred at 600 rpm for 15 min. The mixture was then transferred to a polytetrafluoroethylene-lined reactor, heated to 80 °C for 60 h, and then cooled to 25 °C. After washing with deionized water and ethanol alternately, the mixture was freeze-dried at -18 °C for 48 h in a vacuum dryer to obtain the framework material. 2.43 g of the framework material was added to 100 g of methanol to obtain the framework material fraction. To obtain a 2-methylimidazole dispersion, 5g of 2-methylimidazole (CAS No.: 693-98-1) was added to 100g of methanol. 16.22g of cobalt nitrate hexahydrate was mixed with 100g of methanol to obtain a cobalt nitrate hexahydrate dispersion. 11.35g of 2-mercaptobenzimidazole (CAS No.: 583-39-1) was mixed with 100g of methanol and sonicated for 30min. This mixture was then added to the cobalt nitrate hexahydrate dispersion and sonicated for another 30min. The mixture was then added to the skeleton material dispersion and stirred at 600rpm for 1h. Finally, 2-methylimidazole was added, and the mixture was stirred at 600rpm for 8h at 25℃. After stirring, the mixture was centrifuged at 1000rpm, washed with deionized water, and freeze-dried at -50℃ for 24h to obtain the skeleton packing.
[0028] Preparation of corrosion-resistant robot cables: Add 70g of low-density polyethylene (CAS No.: 9002-88-4), 95g of cross-linked polyethylene, and 12g of ethylene-vinyl acetate copolymer (CAS No.: 24937-78-8) to a mixer and mix at 110℃ and 40rpm for 8 minutes. Then add 2g of carbon black, 0.3g of antioxidant, 0.2g of light stabilizer, and 0.15g of lubricant to the mixer and continue mixing for 5 minutes. Then cool the mixer to 85℃ and add 1... 8g of crosslinking agent, 8g of graphene corrosion-resistant microcapsules, 10g of corrosion-resistant additives, and 6g of skeleton filler are mixed at 20rpm for 3 minutes to obtain a sheath material. The sheath material is then added to a single-screw extruder, and the cable core is passed through the extruder head to ensure that the sheath material is evenly coated on the surface of the cable core to obtain a crosslinked polyethylene insulation sheath. The sheath material is then fed into a vulcanization pipeline and vulcanized at 180℃ and 1.2MPa saturated steam for 15 minutes. After cooling to room temperature, a corrosion-resistant robot cable is obtained. Example 2
[0029] Preparation of graphene corrosion-resistant microcapsules: 200g of anhydrous ethanol, 8.82g of graphene oxide, and 6.18g of p-phenylenediamine were mixed and refluxed in an oil bath at 70℃ for 10h. The resulting solid was then centrifuged at 3000rpm, washed with deionized water, and dried at 50℃ for 3h to obtain p-phenylenediamine composite graphene oxide. 22g of aniline was mixed with 120g of toluene to obtain an aniline solution. 6.52g of p-phenylenediamine composite graphene oxide and 23.4g of toluene were then mixed... 8g of 8-hydroxyquinoline was added to 200g of deionized water to obtain a mixture. Aniline solution was added to the mixture, and the mixture was stirred at 600rpm for 12h at 1℃ to obtain a composite solution. 30g of ammonium persulfate was added to 80ml of 1mol / L hydrochloric acid, and then added to the composite solution using a separatory funnel. The mixture was stirred at 900rpm for 6h, then centrifuged, and dried at 60℃ for 12h to obtain graphene corrosion-resistant microcapsules.
[0030] Preparation of framework filler: 10.71 g of cobalt nitrate hexahydrate, 19.29 g of terephthalic acid, 100 g of deionized water, 100 g of dimethylformamide, and 100 g of ethanol were mixed and stirred at 600 rpm for 30 min. Then, 10 g of polyvinylpyrrolidone was added, and the mixture was stirred at 600 rpm for 15 min. The mixture was then transferred to a polytetrafluoroethylene-lined reactor, heated to 80 °C for 60 h, and then cooled to 25 °C. After washing with deionized water and ethanol alternately, the mixture was freeze-dried at -18 °C for 48 h in a vacuum dryer to obtain the framework material. 2.31 g of the framework material was added to 100 g of methanol to obtain a framework material dispersion. 5 g of 2 2-Methylimidazole was added to 100g of methanol to obtain a 2-methylimidazole dispersion. 15.38g of cobalt nitrate hexahydrate was mixed with 100g of methanol to obtain a cobalt nitrate hexahydrate dispersion. 12.31g of 2-mercaptobenzimidazole was mixed with 100g of methanol and sonicated for 30min. This mixture was then added to the cobalt nitrate hexahydrate dispersion and sonicated for another 30min. The mixture was then added to the skeleton material dispersion and stirred at 600rpm for 1h. Finally, 2-methylimidazole was added, and the mixture was stirred at 600rpm for 8h at 25℃. After stirring, the mixture was centrifuged at 1000rpm and washed with deionized water. The mixture was then freeze-dried at -50℃ for 24h to obtain the skeleton packing.
[0031] Preparation of corrosion-resistant robot cables: 80g of low-density polyethylene, 105g of cross-linked polyethylene, and 18g of ethylene-vinyl acetate copolymer were added to a mixer and mixed at 110℃ and 40rpm for 8 minutes. Then, 3g of carbon black, 0.5g of antioxidant, 0.4g of light stabilizer, and 0.25g of lubricant were added to the mixer, and mixing continued for 5 minutes. The mixer was then cooled to 85℃, and 2.2g of cross-linking agent, 12g of graphene corrosion-resistant microcapsules, 14g of corrosion-resistant additives, and 7g of skeleton filler were added. The mixture was then mixed at 20rpm for 3 minutes. The resulting material was a sheath material. This sheath material was fed into a single-screw extruder, and the cable core was passed through the extruder head to ensure that the sheath material evenly covered the surface of the cable core, thus obtaining a cross-linked polyethylene insulation sheath. This sheath was then fed into a vulcanization pipeline and vulcanized at 180℃ and 1.2MPa saturated steam for 15 minutes. After cooling to room temperature, a corrosion-resistant robot cable was obtained. Example 3
[0032] Preparation of graphene corrosion-resistant microcapsules: 200g of anhydrous ethanol, 9.38g of graphene oxide, and 5.62g of p-phenylenediamine were mixed and refluxed in an oil bath at 70℃ for 10h. The resulting solid was then centrifuged at 3000rpm, washed with deionized water, and dried at 50℃ for 3h to obtain p-phenylenediamine composite graphene oxide. 22g of aniline was mixed with 120g of toluene to obtain an aniline solution. 7.32g of p-phenylenediamine composite graphene oxide and 22.6g of toluene were then mixed... 8g of 8-hydroxyquinoline was added to 200g of deionized water to obtain a mixture. Aniline solution was added to the mixture, and the mixture was stirred at 600rpm for 12h at 1℃ to obtain a composite solution. 30g of ammonium persulfate was added to 80ml of 1mol / L hydrochloric acid, and then added to the composite solution using a separatory funnel. The mixture was stirred at 900rpm for 6h, then centrifuged, and dried at 60℃ for 12h to obtain graphene corrosion-resistant microcapsules.
[0033] Preparation of framework filler: 11.11 g of cobalt nitrate hexahydrate, 18.89 g of terephthalic acid, 100 g of deionized water, 100 g of dimethylformamide, and 100 g of ethanol were mixed and stirred at 600 rpm for 30 min. Then, 10 g of polyvinylpyrrolidone was added, and the mixture was stirred at 600 rpm for 15 min. The mixture was then transferred to a polytetrafluoroethylene-lined reactor, heated to 80 °C for 60 h, and then cooled to 25 °C. After washing with deionized water and ethanol alternately, the mixture was freeze-dried at -18 °C for 48 h in a vacuum dryer to obtain the framework material. 2.37 g of the framework material was added to 100 g of methanol to obtain a framework material dispersion. 5 g of 2 2-Methylimidazole was added to 100g of methanol to obtain a 2-methylimidazole dispersion. 15.79g of cobalt nitrate hexahydrate was mixed with 100g of methanol to obtain a cobalt nitrate hexahydrate dispersion. 11.84g of 2-mercaptobenzimidazole was mixed with 100g of methanol and sonicated for 30min. This mixture was then added to the cobalt nitrate hexahydrate dispersion and sonicated for another 30min. The mixture was then added to the skeleton material dispersion and stirred at 600rpm for 1h. Finally, 2-methylimidazole was added, and the mixture was stirred at 600rpm for 8h at 25℃. After stirring, the mixture was centrifuged at 1000rpm and washed with deionized water. The mixture was then freeze-dried at -50℃ for 24h to obtain the skeleton packing.
[0034] Preparation of corrosion-resistant robot cables: 75g of low-density polyethylene, 100g of cross-linked polyethylene, and 15g of ethylene-vinyl acetate copolymer were added to a mixer and mixed at 110℃ and 40rpm for 8 minutes. Then, 2.5g of carbon black, 0.4g of antioxidant, 0.3g of light stabilizer, and 0.2g of lubricant were added to the mixer, and mixing continued for 5 minutes. The mixer was then cooled to 85℃, and 2g of cross-linking agent, 10g of graphene corrosion-resistant microcapsules, 12g of corrosion-resistant additives, and 7g of skeleton filler were added. The mixture was then mixed at 20rpm for 3 minutes. The resulting material was a sheath material. This sheath material was fed into a single-screw extruder, and the cable core was passed through the extruder die head to ensure that the sheath material evenly covered the surface of the cable core, thus obtaining a cross-linked polyethylene insulation sheath. This sheath material was then fed into a vulcanization pipeline and vulcanized at 180℃ and 1.2MPa saturated steam for 15 minutes. After cooling to room temperature, a corrosion-resistant robot cable was obtained. Example 4
[0035] Example 4 is based on Example 3. The difference between Example 4 and Example 3 is that in Example 4, 11.54g of graphene oxide and 3.46g of p-phenylenediamine were used when preparing p-phenylenediamine composite graphene. Example 5
[0036] Example 5 is based on Example 3. The difference between Example 5 and Example 3 is that in Example 5, 7.89g of graphene oxide and 7.11g of p-phenylenediamine were used in the preparation of the p-phenylenediamine composite graphene. Example 6
[0037] Example 6 is based on Example 3. The difference between Example 6 and Example 3 is that in the preparation of graphene corrosion-resistant microcapsules in Example 6, 9.68g of p-phenylenediamine composite graphene and 20.32g of 8-hydroxyquinoline were used. Example 7
[0038] Example 7 is based on Example 3. The difference between Example 7 and Example 3 is that in Example 7, when preparing graphene corrosion-resistant microcapsules, 6g of p-phenylenediamine composite graphene and 24g of 8-hydroxyquinoline were used. Example 8
[0039] Example 8 is based on Example 3. The difference between Example 8 and Example 3 is that in Example 8, 13.04 g of cobalt nitrate hexahydrate and 16.96 g of terephthalic acid were used when preparing the skeleton material. Example 9
[0040] Example 9 is based on Example 3. The difference between Example 9 and Example 3 is that in Example 9, 9.68g of cobalt nitrate hexahydrate and 20.32g of terephthalic acid were used when preparing the skeleton material. Example 10
[0041] Example 10 is based on Example 3. The difference between Example 10 and Example 3 is that in Example 10, 17.65g of cobalt nitrate hexahydrate, 2.64g of the skeleton material, and 9.71g of 2-mercaptobenzimidazole were used in the preparation of the skeleton filler. Example 11
[0042] Example 11 is based on Example 3. The difference between Example 11 and Example 3 is that in Example 11, 14.29 g of cobalt nitrate hexahydrate, 2.14 g of the skeleton material, and 13.57 g of 2-mercaptobenzimidazole were used in the preparation of the skeleton filler. Example 12
[0043] Example 12 is based on Example 3. The difference between Example 12 and Example 3 is that 2-mercaptobenzimidazole was not added when preparing the skeleton filler in Example 12. Example 13
[0044] Example 13 is based on Example 3. The difference between Example 13 and Example 3 is that in Example 13, 2-mercaptobenzimidazole is replaced with dopamine hydrochloride when preparing the skeleton filler.
[0045] Comparative Example 1 Comparative Example 1 is based on Example 3. In Comparative Example 1, the p-phenylenediamine composite graphene was replaced with ordinary graphene oxide when preparing graphene corrosion-resistant microcapsules.
[0046] Comparative Example 2 Comparative Example 2 is based on Example 3. In Comparative Example 2, the graphene corrosion-resistant microcapsules were replaced with an equal amount of 8-hydroxyquinoline when preparing the sheath material.
[0047] Comparative Example 3 Comparative Example 3 is based on Example 3. In Comparative Example 3, the skeleton filler was replaced with an equal amount of 2-mercaptobenzimidazole when preparing the sheath material.
[0048] Performance testing The following performance tests were performed on the samples of Examples 1-13 and Comparative Examples 1-3: (1) Mechanical strength Using GB / T 2951.11-2008 as the testing standard, the tensile strength and elongation at break of the specimens were tested. Each specimen was tested three times, and the average value was taken. The test results were recorded in Table 1.
[0049] (2) Corrosion resistance Using GB / T 10125-2021 as the testing standard, the salt spray corrosion resistance of the samples was tested. Each sample was tested 3 times, and the average value was taken. The test results were recorded in Table 1. Using GB / T 2951.12-2008 as the testing standard, the samples were subjected to a long-term salt spray high-temperature test. The test conditions were: 100℃±2℃, and the aging time was: 168h, 336h, and 720h. After aging, the samples were taken out and placed in an environment of 23℃±2℃ for more than 16h. Then the elongation at break was tested, and the elongation at break retention rate after aging was calculated. Each sample was tested 3 times, and the average value was taken. The test results were filled in Table 1. Table 1 Performance test results of Examples 1-13 and Comparative Examples 1-3
[0050] As shown in Table 1, the tensile strength of Examples 1-3 is above 22 MPa, the elongation at break is above 375%, the salt spray resistance time is above 1400 h, the elongation at break retention rate after 168 h of salt spray aging is above 84%, the elongation at break retention rate after 336 h of salt spray aging is above 75%, and the elongation at break retention rate after 720 h of salt spray aging is above 65%. This indicates that the robot cable prepared in this application has good tensile strength and elongation at break, as well as good corrosion resistance and long-term corrosion resistance.
[0051] In Examples 4 and 5, the amounts of graphene oxide and p-phenylenediamine used in the preparation of p-phenylenediamine graphene were not within the ranges specified in this application. When p-phenylenediamine was insufficient, the graphene functionalization was incomplete, the cross-linking degree of the capsule wall was low, the microcapsule structure was loose, the encapsulation efficiency decreased, and the sustained-release performance was weakened. When p-phenylenediamine was excessive, it would self-polymerize in the system, leading to the stacking of graphene oxide sheets, a decrease in capsule wall density, and affecting the subsequent loading rate.
[0052] In Examples 6 and 7, the mass ratio between p-phenylenediamine stone composite graphene and 8-hydroxyquinoline during the preparation of graphene corrosion-resistant microcapsules was not within the range specified in this application. When the content of 8-hydroxyquinoline was insufficient, the drug loading was low, and the performance decreased significantly after aging. When there was too much 8-hydroxyquinoline, it affected the capsule wall strength, and some 8-hydroxyquinoline was only physically adsorbed on the surface, resulting in significant initial release and insufficient protection in the later stage.
[0053] In Examples 8 and 9, the mass ratio of cobalt nitrate hexahydrate to terephthalic acid was not within the range specified in this application when preparing the framework material. When terephthalic acid was insufficient, the prepared framework material had more crystal defects, a lower specific surface area, a reduced structural strength, and a lower loading of 2-mercaptobenzimidazole. When terephthalic acid was excessive, the excess ligand blocked the pores, affecting the overall regularity and adsorption performance of the framework material.
[0054] In Examples 10 and 11, the mass ratios of cobalt nitrate hexahydrate, the framework material, and 2-mercaptobenzimidazole during the preparation of the skeleton filler were not within the range specified in this application. When 2-mercaptobenzimidazole was insufficient, the loading of the slow-release agent was insufficient, the pores of the framework material were not fully utilized, and the corrosion resistance decreased. When 2-mercaptobenzimidazole was excessive, some of the 2-mercaptobenzimidazole was only physically applied to the surface, resulting in a decrease in the protective performance in the later stages.
[0055] In Example 12, no 2-mercaptobenzimidazole was added during the preparation of the skeleton filler. As a result, the skeleton filler lost its core functions of chelating metal ions and actively inhibiting corrosion, and its synergistic effect was lost.
[0056] In Example 13, 2-mercaptobenzimidazole was replaced with dopamine hydrochloride, which could further improve interfacial compatibility and scavenge free radicals, but the corrosion inhibition function of metal coordination was lost, resulting in decreased corrosion resistance.
[0057] In Comparative Example 1, the p-phenylenediamine composite graphene was replaced with ordinary graphene oxide to prepare graphene corrosion-resistant microcapsules. Ordinary graphene oxide lacks amino sites, making it difficult for polyaniline to nucleate on the surface of graphene oxide. The coating layer is discontinuous and falls off, resulting in an incomplete microcapsule structure. The 8-hydroxyquinoline encapsulation rate is low, and it is difficult to form an interaction with the imidazole groups on the surface of the skeleton filler, leading to the aggregation of microcapsules in the organism and a decrease in dispersibility.
[0058] In Comparative Example 2, the graphene corrosion-resistant microcapsules were replaced with an equal amount of 8-hydroxyquinoline. The 8-hydroxyquinoline was directly dispersed in the matrix without the protection of microcapsules. It decomposed during high-temperature mixing and extrusion, resulting in low retention. In the early stages, it quickly migrated to the surface, making it difficult to provide long-lasting slow-release corrosion protection. Furthermore, the number of stress concentration points in the matrix increased, compatibility decreased, and stability decreased.
[0059] In Comparative Example 3, the skeleton filler was replaced with an equal amount of 2-mercaptobenzimidazole. When 2-mercaptobenzimidazole was directly dispersed in the matrix, it decomposed during the mixing and extrusion process, making it difficult to provide long-term protection. Furthermore, it was difficult to achieve a two-component synergistic effect with 8-hydroxyquinoline, resulting in a decrease in long-term sustained-release performance. When 2-mercaptobenzimidazole was added directly, it migrated, leading to interfacial defects and a decrease in the overall stability of the system.
[0060] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.
Claims
1. A corrosion-resistant robot cable, characterized in that: It includes a cross-linked polyethylene (XLPE) insulating sheath and a cable core, wherein the XLPE insulating sheath comprises the following components in parts by weight: Low-density polyethylene 70-80 parts, cross-linked polyethylene 95-105 parts, ethylene-vinyl acetate copolymer 12-18 parts, graphene corrosion-resistant microcapsules 8-12 parts, skeleton filler 6-8 parts, cross-linking agent 1.8-2.2 parts, corrosion-resistant additive 10-14 parts, antioxidant 0.3-0.5 parts, light stabilizer 0.2-0.4 parts, lubricant 0.15-0.25 parts, carbon black 2-3 parts; The raw materials for the graphene corrosion-resistant microcapsules include graphene oxide, p-phenylenediamine, and a corrosion resistant agent.
2. The corrosion-resistant robot cable according to claim 1, characterized in that: The graphene-resistant microcapsules were prepared using the following method: Anhydrous ethanol, graphene oxide, and p-phenylenediamine were mixed and refluxed in an oil bath. The resulting solid was then centrifuged, washed, and dried sequentially to obtain p-phenylenediamine composite graphene oxide. Aniline was mixed with toluene to obtain an aniline solution. The p-phenylenediamine composite graphene oxide, a corrosion resistant agent, and water were mixed to obtain a mixed solution. The aniline solution and the mixed solution were mixed and stirred to obtain a composite solution. Ammonium persulfate and hydrochloric acid were mixed and added to the composite solution. The mixture was stirred, centrifuged, and dried to obtain graphene corrosion resistant microcapsules.
3. The corrosion-resistant robot cable according to claim 2, characterized in that: The corrosion resistant agent includes 8-hydroxyquinoline.
4. The corrosion-resistant robot cable according to claim 3, characterized in that: The mass ratio of graphene oxide to p-phenylenediamine is 1:(0.5-0.7).
5. A corrosion-resistant robot cable according to claim 3, characterized in that: The mass ratio of the p-phenylenediamine composite graphene oxide to 8-hydroxyquinoline is 1:(2.6-3.6).
6. The corrosion-resistant robot cable according to claim 1, characterized in that: The raw materials for preparing the skeleton filler include skeleton materials, 2-mercaptobenzimidazole and 2-methylimidazole.
7. A corrosion-resistant robot cable according to claim 6, characterized in that: The skeleton filler is prepared by the following method: Cobalt nitrate hexahydrate, terephthalic acid, water, ammonium formate, and ethanol were mixed, stirred, and polyvinylpyrrolidone was added and stirred. The mixture was heated to react, then cooled, washed, and freeze-dried to obtain the framework material. The framework material was mixed with methanol to obtain a framework material dispersion. 2-methylimidazole was mixed with methanol to obtain a 2-methylimidazole dispersion. Cobalt nitrate hexahydrate was mixed with methanol to obtain a cobalt nitrate hexahydrate dispersion. 2-Mercaptobenzimidazole was mixed with methanol and added to the cobalt nitrate hexahydrate dispersion, then added to the framework material dispersion. After stirring, 2-methylimidazole was added. After stirring, the mixture was centrifuged, washed, and freeze-dried to obtain the framework filler.
8. A corrosion-resistant robot cable according to claim 7, characterized in that: The mass ratio of cobalt nitrate hexahydrate to terephthalic acid is 1:(1.6-1.8).
9. A corrosion-resistant robot cable according to claim 7, characterized in that: The mass ratio of cobalt nitrate hexahydrate, the framework material, and 2-mercaptobenzimidazole is 1:0.15:(0.7-0.8).
10. A method for preparing a corrosion-resistant robot cable according to any one of claims 1-9, characterized in that: Includes the following steps: Low-density polyethylene, cross-linked polyethylene, and ethylene-vinyl acetate copolymer are mixed in an intensive mixing process. Then, carbon black, antioxidants, light stabilizers, and lubricants are added, and the mixing continues. Cross-linking agents, graphene corrosion-resistant microcapsules, corrosion-resistant additives, and skeleton fillers are added. After intensive mixing, the material is discharged to obtain a sheath material. The sheath material is added to a single-screw extruder, and the cable core is passed through the extruder die head so that the sheath material is evenly coated on the surface of the cable core to obtain a cross-linked polyethylene insulation sheath. Then, it is sent to a vulcanization pipeline for vulcanization. After cooling, a corrosion-resistant robot cable is obtained.