A charging pile cable resistant to tension
By chemically bonding modified fillers with polyurethane elastomers and vulcanized rubber, a three-dimensional cross-linked structure is constructed, which solves the problems of insufficient flexibility and tensile strength of the charging pile cable sheath layer and achieves high strength and wear resistance of the material.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FUJIAN TONGYU CABLES
- Filing Date
- 2026-04-20
- Publication Date
- 2026-05-29
AI Technical Summary
Existing charging pile cable sheath materials, while providing wear resistance and compressive strength, struggle to balance flexibility and tensile strength. Furthermore, the interfacial bonding strength between the filler and the polymer matrix is insufficient, leading to a decline in mechanical properties.
Modified fillers are treated with aminosilane coupling agents to form chemical bonds with polyurethane elastomers and polypropylene. The epoxy groups on the surface of the vulcanized rubber react with the modified fillers to construct a three-dimensional cross-linked structure, which enhances the interfacial bonding strength and provides skeletal support through polypropylene.
It significantly improves the flexibility and tensile strength of charging pile cables, enhances interfacial bonding strength, improves the wear resistance and anti-aging properties of materials, and solves the problem of mechanical property degradation of traditional materials during long-term use.
Smart Images
Figure CN122117539A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of charging pile cables, and in particular to a tensile-resistant charging pile cable. Background Technology
[0002] Charging pile cables mainly consist of a cable core, an insulation layer, and a sheath. During frequent use, charging pile cables must withstand multiple tests, including being run over by vehicles and repeatedly bent. As the outermost layer of protection, the sheath directly determines the cable's service life and safety.
[0003] Currently, to address the issues of wear resistance and pressure resistance in the sheath layer, high-hardness cross-linked polyethylene offers good pressure and wear resistance, but its high hardness results in poor cable flexibility and difficulty in dragging. While soft polyvinyl chloride or thermoplastic polyurethane offers good flexibility, its tensile strength is insufficient. Although rigid fillers such as glass fiber and carbon fiber are added to enhance strength, these fillers significantly reduce the material's flexibility and elongation at break. Furthermore, the interfacial bonding strength between the filler and the polymer matrix is insufficient due to physical blending or simple coupling agent treatment. This leads to interfacial debonding during long-term stress or aging, resulting in a significant decrease in mechanical properties. Therefore, there is still room for improvement. Summary of the Invention
[0004] This application provides a tensile-resistant charging pile cable.
[0005] The technical solution adopted in this application is as follows: A type of high-strength charging pile cable includes a cable core, an insulating layer, and a sheath layer. The sheath layer comprises the following components by weight: 45-50 parts of polyurethane elastomer, 15-20 parts of polypropylene, 8-12 parts of epoxy-containing matrix component, 10-12 parts of vulcanized rubber, 6-8 parts of modified filler, 2-4 parts of abrasion resistant agent, 4-6 parts of toughening agent, 0.5-0.8 parts of accelerator, 0.8-1.2 parts of anti-aging agent, and 1-2 parts of processing aid. The modified filler is prepared by modifying the filler surface with an aminosilane coupling agent.
[0006] By adopting the above technical solution, the outermost sheath layer plays a protective role. The sheath layer is composed of polyurethane elastomer as the continuous phase, which provides the flexibility of the sheath layer and ensures that the cable sheath layer does not break when repeatedly bent. Polypropylene, as a rigid dispersed phase, provides a skeleton support. The modified filler has amino groups on its surface, which can form chemical bonds with epoxy groups, firmly anchoring the filler to the matrix and forming a cross-linked point structure, thereby enhancing the interfacial bonding strength between the filler and the matrix.
[0007] Optionally, the epoxy-containing matrix component is selected from one or a mixture of two of epoxy resins or ethylene-methyl acrylate-glycidyl methacrylate terpolymers.
[0008] By adopting the above technical solution, the epoxy-containing matrix component can improve the compatibility with polyurethane elastomer and polypropylene, and the dispersion is more uniform. After the epoxy group reacts with the amino group on the surface of the modified filler, the interfacial bonding strength of the filler is greatly improved.
[0009] Optionally, the modified filler is selected from one or more of nano-calcium carbonate and nano-silica.
[0010] Optionally, the modified filler is prepared by the following steps: adding the filler to an ethanol / water mixture, mixing evenly, reacting for 2-5 hours, then filtering and drying to obtain the modified filler, wherein the mixture contains 0.3-0.5 wt% aminosilane coupling agent.
[0011] By adopting the above technical solution, a modified filler containing amino groups on its surface is obtained.
[0012] Optionally, the aminosilane coupling agent is selected from one of 3-aminopropylmethyldimethoxysilane, 3-aminopropyltrimethoxysilane, and 3-aminopropylmethyldiethoxysilane.
[0013] Optionally, the processing aid is selected from calcium stearate, and the toughening agent is selected from maleic anhydride-grafted polyolefin elastomer.
[0014] By adopting the above technical solutions, an internal lubrication effect is achieved, improving processing fluidity; the toughening agent avoids excessive cross-linking that leads to increased brittleness, ensuring that the material maintains a high elongation at break.
[0015] Optionally, the vulcanized rubber is prepared by the following steps: ethylene propylene diene monomer (EPDM) rubber is melt-grafted with glycidyl methacrylate and a peroxide initiator at 120-140°C to obtain epoxy functionalized rubber; then, the epoxy functionalized rubber is dynamically vulcanized with phenolic resin at 160-180°C, controlling the degree of vulcanization to 85%-95%, and the vulcanized rubber is obtained by discharging the product.
[0016] By adopting the above technical solution, the rubber surface carries epoxy groups, which can also react with amino groups on the surface of the modified filler to form chemical bonds between the rubber and filler interface, further improving the interfacial bonding strength. In addition, the rubber particles form internal cross-links through dynamic vulcanization and form matrix bonds through epoxy-amino reactions, forming a core-shell-like reinforced structure, thereby improving the tensile strength and elongation at break of the sheath layer.
[0017] Optionally, the crosslinking catalyst is a tertiary amine or imidazole catalyst.
[0018] By adopting the above technical solution, the specific materials can be selected from 2-methylimidazole and triethylamine, which can catalyze the ring-opening addition reaction of epoxy-amino compounds, making the cross-linking system in the matrix more complete.
[0019] Optionally, the wear-resistant agent is a mixture of ultra-high molecular weight polyethylene powder and molybdenum disulfide.
[0020] By adopting the above technical solution, a transfer lubricating film is formed on the surface of the sheath layer. The two work together to lubricate, reduce the coefficient of friction, and reduce drag resistance.
[0021] Optionally, the anti-aging agent is selected from a mixture of antioxidant 1010 and antioxidant 168; the processing aid is selected from calcium stearate.
[0022] In summary, this application includes at least one of the following beneficial effects: 1. The amino groups grafted on the surface of the modified filler react with the epoxy groups in the matrix to form an "anchor effect," which significantly improves the interfacial bonding strength. The epoxy groups on the surface of the rubber phase can react with the aminated filler and the amino groups in the matrix to form chemical bonds between rubber and filler and between rubber and matrix, forming a three-dimensional covalent cross-linked structure. This breaks through the technical bottleneck of traditional sheath materials where "high tensile strength and high flexibility are difficult to achieve simultaneously," and produces a tensile-resistant charging pile cable. Attached Figure Description
[0023] Figure 1 This is a structural schematic diagram of an embodiment of this application.
[0024] Explanation of reference numerals in the attached diagram: 1. Cable core; 2. Insulation layer; 3. Sheath layer. Detailed Implementation
[0025] The present application will be further described in detail below with reference to the accompanying drawings.
[0026] Preparation of modified fillers Nano-calcium carbonate was vacuum dried at 100℃ for 4 hours to remove surface moisture. 0.5 parts of 3-aminopropylmethyldimethoxysilane were added to 100 parts of ethanol / water mixed solvent (volume ratio 95:5) and mixed evenly. Then 10 parts of the mixture were added and stirred at 80℃ for 3 hours. The mixture was then filtered, washed, vacuum dried at 80℃ to constant weight, ground and sieved to obtain the modified filler with surface-grafted amino groups.
[0027] Preparation of vulcanized rubber 100 parts of EPDM rubber, 4 parts of glycidyl methacrylate, and 0.2 parts of dicumyl peroxide were melt-grafted in an internal mixer at 130°C to obtain epoxy-functionalized rubber. Then, the obtained epoxy-functionalized rubber was dynamically vulcanized with 5 parts of phenolic resin in an internal mixer at 170°C, with the degree of vulcanization controlled at 85%. The product was then discharged and granulated to obtain vulcanized rubber. Example 1
[0028] This application discloses a tensile-resistant charging pile cable, referring to... Figure 1 It includes a cable core 1, an isolation layer 2, and a sheath layer 3. The cable core 1 is located at the innermost part, the isolation layer 2 is wrapped around the outside of the cable core, and the sheath layer 3 is the outermost layer of the cable, which plays a protective role for the inside.
[0029] Its preparation method includes the following steps: S1. The insulation layer is wrapped around the cable core to obtain a semi-finished charging pile cable; S2. By weight, 45 parts of polyurethane elastomer, 20 parts of polypropylene, 8 parts of epoxy-containing matrix component (selected from a mixture of epoxy resin and ethylene-methyl acrylate-glycidyl methacrylate terpolymer, with a mass ratio of 3:1), 10 parts of vulcanized rubber, 8 parts of modified filler, 3 parts of wear-resistant agent (selected from a mixture of ultra-high molecular weight polyethylene powder and molybdenum disulfide, with a mass ratio of 1:1), 4 parts of toughening agent (selected from maleic anhydride-grafted polyolefin elastomer), 0.5 parts of accelerator (selected from triethylamine), and 0.8 parts of anti-aging agent (selected from antioxidant 10). A mixture of 10 and antioxidant 168, and 2 parts of processing aid (selected from calcium stearate) were added to a high-speed mixer and premixed for 5 minutes. Then, the mixture was added to a twin-screw extruder for melt blending. The extrusion temperature was set as follows: Zone 1 165℃, Zone 2 175℃, Zone 3 185℃, Zone 4 195℃, Zone 5 190℃, Die head 185℃, and screw speed 350 rpm. After extrusion, the material was water-cooled, pelletized, and dried to obtain the sheath layer material. The sheath layer material was then extruded onto the semi-finished charging pile cable through a single-screw extruder to form the sheath layer. After cooling and shaping in a water tank, the charging pile cable was obtained. Example 2
[0030] The process steps and raw materials of this embodiment are the same as those of Embodiment 1. The difference is that the raw materials of the sheath layer in step S2, by weight, include 50 parts of polyurethane elastomer, 15 parts of polypropylene, 12 parts of epoxy-containing matrix component (selected from a mixture of epoxy resin and ethylene-methyl acrylate-glycidyl methacrylate terpolymer, with a mass ratio of 3:1), 10 parts of vulcanized rubber, 6 parts of modified filler, 3 parts of wear-resistant agent (selected from a mixture of ultra-high molecular weight polyethylene powder and molybdenum disulfide, with a mass ratio of 1:1), 6 parts of toughening agent (selected from maleic anhydride grafted polyolefin elastomer), 0.5 parts of accelerator (selected from triethylamine), 1.2 parts of anti-aging agent (selected from a mixture of antioxidant 1010 and antioxidant 168), and 1 part of processing aid (selected from calcium stearate). Example 3
[0031] The process steps and raw materials of this embodiment are the same as those of Embodiment 1. The difference is that the raw materials of the sheath layer in step S2, by weight, include 48 parts of polyurethane elastomer, 18 parts of polypropylene, 10 parts of epoxy-containing matrix component (selected from a mixture of epoxy resin and ethylene-methyl acrylate-glycidyl methacrylate terpolymer, with a mass ratio of 3:1), 12 parts of vulcanized rubber, 8 parts of modified filler, 3 parts of wear-resistant agent (selected from a mixture of ultra-high molecular weight polyethylene powder and molybdenum disulfide, with a mass ratio of 1:1), 5 parts of toughening agent (selected from maleic anhydride grafted polyolefin elastomer), 0.6 parts of accelerator (selected from triethylamine), 1.2 parts of anti-aging agent (selected from a mixture of antioxidant 1010 and antioxidant 168), and 1 part of processing aid (selected from calcium stearate). Example 4
[0032] The process steps and raw materials of this embodiment are the same as those of Embodiment 1. The difference is that in step S2, all 12 parts of the epoxy-containing matrix component in the sheath layer raw material are selected from epoxy resin.
[0033] Comparative Example 1 The process steps and raw materials of this comparative example and Example 1 are the same, except that in step S2, an equal amount of nano-calcium carbonate is used to replace the modified filler in the sheath layer raw material.
[0034] Comparative Example 2 The process steps and raw materials of this comparative example and Example 1 are the same, except that no epoxy-containing matrix component is added to the sheath layer raw material in step S2.
[0035] Comparative Example 3 The process steps and raw materials of this comparative example and Example 1 are the same. The difference is that in step S2, glycidyl methacrylate was not used for grafting in the preparation of vulcanized rubber in the sheath layer raw material.
[0036] Performance testing Remove the sheath material of the charging pile cable, test its tensile strength and elongation at break according to ASTM D412, and conduct a 1008h xenon lamp aging test according to GB / T 16422.2-2022, and then test the tensile strength retention rate.
[0037] The test data for Examples 1-4 and Comparative Examples 1-3 are shown in the table below.
[0038] Tensile strength / MPa Breaking elongation / % Tensile strength retention / % Example 1 30.3 456 90.3 Example 2 31.1 440 90.6 Example 3 32.8 468 92.3 Example 4 31.8 411 90.5 Comparative Example 1 25.3 365 80.2 Comparative Example 2 24.3 398 82.1 Comparative Example 3 27.3 401 83.1 In this application, by grafting amino groups onto the filler surface and introducing epoxy groups into the matrix, the traditional physical interface is transformed into a chemical covalent bond interface after the amino and epoxy groups react. At the same time, a vulcanized rubber containing epoxy groups is used to construct a spatially complementary three-dimensional cross-linked network. The stress is uniformly transferred and there are no weak interfaces, so that the whole structure has both strength and toughness. Furthermore, under the action of the overall cross-linked network, it has better aging resistance.
[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A tensile-resistant charging pile cable, comprising a cable core, an insulating layer, and a sheath layer, characterized in that: The sheath layer comprises the following components by weight: 45-50 parts polyurethane elastomer, 15-20 parts polypropylene, 8-12 parts epoxy-containing matrix component, 10-12 parts vulcanized rubber, 6-8 parts modified filler, 2-4 parts wear-resistant agent, 4-6 parts toughening agent, 0.5-0.8 parts accelerator, 0.8-1.2 parts anti-aging agent, and 1-2 parts processing aid. The modified filler is prepared by modifying the filler surface with an aminosilane coupling agent.
2. The tensile-resistant charging pile cable according to claim 1, characterized in that: The epoxy-containing matrix component is selected from one or a mixture of two of epoxy resins or ethylene-methyl acrylate-glycidyl methacrylate terpolymers.
3. The tensile-resistant charging pile cable according to claim 2, characterized in that: The modified filler is selected from one or more of nano-calcium carbonate and nano-silica.
4. The tensile-resistant charging pile cable according to claim 3, characterized in that: The modified filler is prepared by the following steps: the filler is added to an ethanol / water mixture, mixed evenly, reacted for 2-5 hours, and then filtered and dried to obtain the modified filler. The mixture contains 0.3-0.5 wt% aminosilane coupling agent.
5. The tensile-resistant charging pile cable according to claim 4, characterized in that: The aminosilane coupling agent is selected from one of 3-aminopropylmethyldimethoxysilane, 3-aminopropyltrimethoxysilane, and 3-aminopropylmethyldiethoxysilane.
6. The tensile-resistant charging pile cable according to claim 1, characterized in that: The processing aid is selected from calcium stearate, and the toughening agent is selected from maleic anhydride-grafted polyolefin elastomer.
7. The tensile-resistant charging pile cable according to claim 1, characterized in that: The vulcanized rubber is prepared by the following steps: EPDM rubber is melt-grafted with glycidyl methacrylate and a peroxide initiator at 120-140°C to obtain epoxy functionalized rubber. Then, the epoxy functionalized rubber is dynamically vulcanized with phenolic resin at 160-180°C, and the degree of vulcanization is controlled to be 85%-95%. The vulcanized rubber is then discharged.
8. The tensile-resistant charging pile cable according to claim 7, characterized in that: The crosslinking catalyst is a tertiary amine or imidazole catalyst.
9. The tensile-resistant charging pile cable according to claim 8, characterized in that: The wear-resistant agent is a mixture of ultra-high molecular weight polyethylene powder and molybdenum disulfide.
10. The tensile-resistant charging pile cable according to claim 9, characterized in that: The anti-aging agent is selected from a mixture of antioxidant 1010 and antioxidant 168.