Corrosion-resistant cable material, energy storage cable and preparation method thereof

Abstract

The invention discloses a corrosion-resistant cable material, an energy storage cable and a preparation method of the corrosion-resistant cable material, and belongs to the technical field of cables. The corrosion-resistant cable material comprises the following raw materials: a hexadecylamine functionalized graphene bentonite copolymer, modified epoxy resin E5, chlorinated polyethylene, a plasticizer, paraffin, mica powder and an antioxidant. The hexadecylamine functionalized graphene bentonite copolymer is obtained by adding acidified bentonite into a graphene dispersion liquid, stirring and then carrying out hydrophobic modification through hexadecylamine; the modified epoxy resin E51 and 5-aminosalicylic acid are subjected to a hydrothermal reaction to obtain nitrogen-doped quantum dots, the nitrogen-doped quantum dots are ultrasonically mixed with ethyl alcohol, then the waterborne curing agent is added, then the epoxy resin E51 is added, and high-speed stirring is performed to obtain the cable material, the cable material has good waterproofness, corrosion resistance and mechanical performance, and stable operation of an energy storage cable can be guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables, and specifically relates to a corrosion-resistant cable material, an energy storage cable and a preparation method thereof. Background Art

[0002] In coastal photovoltaic energy storage systems, energy storage cables, as the core carrier of energy transmission, have highlighted their irreplaceable application value. However, traditional cable materials generally have insufficient corrosion resistance in highly corrosive environments such as salt spray, acid and alkali. This directly leads to a significant shortening of the cable service life and seriously hinders the stable operation of the energy storage system. Therefore, it is of great significance to develop cables that can adapt to the special corrosive environment of coastal areas and have both excellent corrosion resistance and long service life.

[0003] Chinese patent publication number CN102746564B discloses a modified high-temperature and corrosion-resistant cable material and a preparation method thereof. The cable material first weighs EVA, polypropylene chloride resin, bentonite and high-wear-resistant carbon black by weight and mixes them evenly to obtain a mixture A. Then, corresponding weight parts of polyacetamide, nano-silica, silane coupling agent, butyl titanate, plasticizer, chlorinated paraffin and nano-magnesium hydroxide are added to the mixture A, and stirred at low speed at room temperature until uniform to obtain a mixture B. The mixture B is then mixed and granulated by an open mill, an internal mixer or a twin-screw extruder to obtain a modified high-temperature and corrosion-resistant cable material. The preparation method of the present invention is simple and the formula of the constituent raw materials is reasonable. The obtained cable material has the advantages of high mechanical properties, high-temperature resistance and corrosion resistance.

[0004] However, in photovoltaic energy storage systems in coastal cities during the rainy season, when using cable materials containing bentonite, the shortcoming of bentonite's strong water absorption is highlighted. It easily absorbs a large amount of water vapor in the air, resulting in a decrease in the insulation performance of the cable material and a weakening of the mechanical strength, seriously affecting the safe operation and service life of the energy storage cable. Summary of the Invention

[0005] The object of the present invention is to provide a corrosion-resistant cable material, an energy storage cable and a preparation method thereof. By modifying bentonite with graphene and functionalizing it with hexadecylamine to reduce its water absorption, combining it with nitrogen-doped quantum dot-modified epoxy resin E51, and compounding the two modified materials with other additives, a cable material with excellent corrosion resistance, low water absorption and good mechanical properties is prepared. This solves the problem of reduced insulation performance and mechanical strength caused by water absorption of bentonite-containing cable materials in photovoltaic energy storage systems in coastal cities during the rainy season. At the same time, the cable material can be used as the outer sheath material of the energy storage cable to ensure the safe operation and service life of the energy storage cable.

[0006] The purpose of the present invention can be achieved through the following technical solutions: According to one aspect of the present invention, a corrosion-resistant cable material is first provided, comprising the following raw materials, by weight: 10-20 parts of hexadecylamine functionalized graphene bentonite copolymer, 20-30 parts of modified epoxy resin E51, 20-30 parts of chlorinated polyethylene, 3-8 parts of plasticizer, 0.8-2 parts of paraffin wax, 2-3 parts of mica powder, and 0.2-0.5 parts of antioxidant; Furthermore, the hexadecylamine functionalized graphene bentonite copolymer is prepared by the following steps: Step 1: Pre-treating the bentonite ore and reacting it with an acetic acid solution to obtain acidified bentonite; adding the acidified bentonite to a graphene powder dispersion under nitrogen conditions and stirring to react to obtain graphene-modified bentonite; Step 2: hydrophobically modifying the graphene-modified bentonite with hexadecylamine to obtain a hexadecylamine-functionalized graphene-bentonite copolymer.

[0007] Furthermore, the specific preparation process of graphene-modified bentonite is as follows: Under nitrogen conditions, DMF and graphene powder were added to a reactor, ultrasonically dispersed, and acidified bentonite was added. The reaction was stirred at 120-140°C for 4 hours. After the reaction was completed, the reaction was centrifuged, and the filter cake was washed twice with DMF, anhydrous ethanol and deionized water in sequence, dried, ground, and passed through a 200-mesh sieve to obtain graphene-modified bentonite.

[0008] Furthermore, the usage ratio of DMF, graphene powder and acidified bentonite is 400-600 mL: 2-4 g: 8-12 g.

[0009] Furthermore, the specific preparation process of acidified bentonite is as follows: Bentonite ore and deionized water are added to a reactor, ultrasonically dispersed for 20-30 minutes, centrifuged, dried, ground, passed through a 200-mesh sieve, transferred to a tube furnace, and calcined for 1.5 hours to 2 hours at 350-450° C. in an air atmosphere. After cooling, the calcined bentonite is placed in an acetic acid solution with a concentration of 0.5 mol / L and ultrasonically dispersed for 20-40 minutes, reacted at 80-90° C. for 1-2 hours, centrifuged, filtered, and the filter cake is washed with deionized water until the last washing solution is neutral, and dried to obtain acidified bentonite.

[0010] Furthermore, the usage ratio of bentonite ore, deionized water and acetic acid solution is 15-25 g: 300-500 mL: 150-220 mL.

[0011] Furthermore, the specific preparation process of hexadecylamine functionalized graphene bentonite copolymer is as follows: Add the surface modifier hexadecylamine and ethanol into a reactor, stir until dissolved, add graphene-modified bentonite, ultrasonically disperse for 20-40 minutes, then react at 80-90°C for 20-24 hours, centrifuge, take the precipitate, wash it with ethanol 3-4 times, and dry it at 55-65°C for 24-32 hours to obtain a hexadecylamine-functionalized graphene bentonite copolymer.

[0012] Furthermore, the usage ratio of hexadecylamine, ethanol and graphene-modified bentonite is 2-4 g: 60-90 mL: 1.5-2.5 g.

[0013] Furthermore, the modified epoxy resin E51 was prepared by the following steps: Nitrogen-doped quantum dot powder was obtained by hydrothermal reaction using 5-aminosalicylic acid as raw material. The powder was ultrasonically mixed with ethanol, and a water-based curing agent was added to remove the ethanol to obtain a viscous mixture. Epoxy resin E51 was then added and stirred at high speed to obtain modified epoxy resin E51.

[0014] Furthermore, the specific preparation process of modified epoxy resin E51 is as follows: Nitrogen-doped quantum dot powder and ethanol were added to a reactor, ultrasonically treated for 20-30 minutes, a water-based curing agent was added, and the mixture was stirred at 300-400 rpm for 30-50 minutes. The ethanol was removed by rotary evaporation to obtain a viscous mixture. Epoxy resin E51 was added to the mixture, and stirred at a high speed of 3000-4000 rpm for 5-8 minutes to obtain modified epoxy resin E51.

[0015] Furthermore, the usage ratio of nitrogen-doped quantum dot powder, ethanol, water-based curing agent and epoxy resin E51 is 0.5-1 g: 20-40 mL: 3-4 g: 2-3 g.

[0016] Furthermore, the specific preparation process of nitrogen-doped quantum dot powder is as follows: 5-aminosalicylic acid and ethanol were added to a reactor, stirred until dissolved, reacted at 170-180°C for 16-18 hours, and purified using a dialysis bag with a molecular weight cutoff of 3.0 kDa after naturally cooling to room temperature. The resulting solution was rotary evaporated to remove ethanol and dried to obtain nitrogen-doped quantum dot powder.

[0017] Furthermore, the usage ratio of 5-aminosalicylic acid and ethanol is 5-8 g: 500-800 mL.

[0018] Furthermore, a method for preparing a corrosion-resistant cable material is as follows: Hexadecylamine functionalized graphene bentonite copolymer, modified epoxy resin E51, chlorinated polyethylene, plasticizer, paraffin wax, mica powder and antioxidant are poured into a high-speed mixer, stirred at 25-30°C and 800-900 rpm for 20-30 minutes, then stirred at 70-80°C and 3000-4000 rpm for 20-30 minutes, the obtained mixture is melted at 250-300°C, and injection molded at 100-150°C to obtain a corrosion-resistant cable material.

[0019] Furthermore, the plasticizer includes but is not limited to dioctyl terephthalate, and the antioxidant includes but is not limited to antioxidant 1024.

[0020] In addition, the present invention also provides a method for preparing an energy storage cable, which is characterized in that corrosion-resistant cable material is used as the outer sheath material.

[0021] Furthermore, the specific preparation process of the energy storage cable is as follows: The twisted tinned copper wire is used as the conductive core, and ceramic silicone rubber is coated on the outside of the conductive core to form an insulation layer. Tinned wire is woven on the outside of the insulation layer by a cable braiding machine to form a shielding layer. Silicon-based lubricant is coated on the surface of the shielding layer to fill the braiding gaps, and then an extrusion machine is used to extrude the outer sheath material on the surface of the shielding layer to form an outer sheath, thereby obtaining an energy storage cable.

[0022] Beneficial effects of the present invention: 1. The present invention modifies bentonite with graphene and functionalizes it with hexadecylamine. The graphene's lamellar structure can block some of the pores in the bentonite, and the hydrophobic groups of hexadecylamine can reduce the surface hydrophilicity. The two synergistically greatly reduce the water absorption of the bentonite. At the same time, the nitrogen-doped quantum dot-modified epoxy resin E51 can form a dense structure, reducing water vapor permeation channels, effectively improving the waterproof performance of the cable material, avoiding the degradation of insulation performance and weakening of mechanical strength due to water absorption, and ensuring the stable operation of the energy storage cable in high humidity environments.

[0023] 2. The present invention modifies bentonite with graphene, and its lamellar structure can construct a physical barrier in the cable material, effectively blocking the invasion of corrosive media. In addition, nitrogen-doped quantum dots are prepared by hydrothermal reaction using 5-aminosalicylic acid as a nitrogen source. When mixed with epoxy resin E51, high-speed stirring is used to promote the dispersion of the quantum dots in the matrix, so that the nitrogen-doped quantum dots are uniformly dispersed in the epoxy resin. As nanoscale powders, the quantum dots fill the micropores and microcracks in the epoxy resin matrix by virtue of the small size effect, reducing the penetration channels of the corrosive medium. In addition, the amino groups on the surface of the quantum dots can attack the electrophilic carbon of the epoxy group in the epoxy resin E51 through lone pairs of electrons, forming a stable carbamate covalent bond, making the quantum dots more firmly bonded to the resin and improving the chemical stability, thereby making the material molecular chain less susceptible to destruction by the corrosive medium, and the intermolecular force less susceptible to weakening due to chemical erosion, thereby reducing the swelling and cracking of the material in a corrosive environment. These modified materials work synergistically with additives such as chlorinated polyethylene to ultimately give the cable material excellent corrosion resistance, making it adaptable to the complex corrosive environment of the coastal area.

[0024] 3. The addition of graphene in the present invention can improve the mechanical strength of the energy storage cable. Its layered structure can effectively transfer stress when subjected to force and inhibit crack propagation. At the same time, high-speed stirring and melt injection molding processes make the components evenly dispersed, reducing stress concentration caused by uneven composition. The two work together to give the cable material good tensile strength and flexibility, which can withstand mechanical stress during installation and use, and ensure the stability of the energy storage cable structure. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1: This example provides a corrosion-resistant cable material, an energy storage cable, and a preparation method thereof, comprising the following steps: S1: 20 g of bentonite ore and 400 mL of distilled water were added to a reactor, ultrasonically dispersed for 20 min, centrifuged, and the resulting solid was dried, ground, passed through a 200-mesh sieve, transferred to a tube furnace, and heated to 400°C at 5°C / min in an air atmosphere, calcined for 2 h, and after cooling, the calcined bentonite was placed in 200 mL of 0.5 mol / L acetic acid solution and ultrasonically dispersed for 20 min. The mixture was reacted at 90°C for 1.5 h, centrifuged, filtered, and the filter cake was washed with deionized water until the final washing solution was neutral, and dried to obtain acidified bentonite; Under nitrogen conditions, 500 mL of DMF and 3 g of graphene powder were added to a reactor, ultrasonically dispersed for 40 min, 10 g of acidified bentonite was added, and the reaction was carried out at 200 rpm and 120 ° C for 4 h. After the reaction was completed, centrifugation was carried out, and the filter cake was washed twice with DMF, anhydrous ethanol and deionized water in sequence, dried at 80 ° C for 12 h, and the dried product was ground and passed through a 200 mesh sieve to obtain graphene-modified bentonite.

[0027] S2: Add 3 g of surface modifier hexadecylamine and 80 mL of ethanol into a reactor and stir until dissolved. Add 2 g of graphene-modified bentonite and ultrasonically disperse for 20 min. Then react at 90°C for 20 h. Centrifuge and wash the precipitate three times with ethanol. Dry at 55°C for 24 h to obtain a hexadecylamine-functionalized graphene-bentonite copolymer.

[0028] S3: Add 6 g of 5-aminosalicylic acid and 600 mL of ethanol to a reactor, stir until dissolved, and react at 180°C for 16 h. After cooling to room temperature, purify the solution using a dialysis bag (molecular weight cutoff of approximately 3.0 kDa). Rotary evaporate the resulting solution to remove ethanol and dry it at 60°C for 10 h to obtain nitrogen-doped quantum dot powder. Using 5-aminosalicylic acid as a nitrogen source, the nitrogen element it contains is introduced into the lattice structure of quantum dots through a hydrothermal reaction, thereby achieving nitrogen doping of quantum dots; 0.5 g of nitrogen-doped quantum dot powder and 20 mL of ethanol were added to a reactor and ultrasonically treated for 15 min. 3 g of EP-128W water-based curing agent was added and stirred at 300 rpm for 30 min. The ethanol was removed by rotary evaporation to obtain a viscous mixture. 2 g of epoxy resin E51 was added to the mixture and vigorously stirred at a high speed of 3000 rpm for 5 min to obtain modified epoxy resin E51.

[0029] S4: Pour 1.5g of hexadecylamine functionalized graphene bentonite copolymer, 2.5g of modified epoxy resin E51, 2g of chlorinated polyethylene, 0.6g of plasticizer dioctyl terephthalate, 0.1g of polyethylene wax, 0.2g of mica powder and 0.03g of antioxidant 1024 into a high-speed blender, stir at 800rpm for 30min at 25°C, then stir at 3000rpm for 30min at 70°C, melt the obtained mixture at 250°C, and injection mold it at 120°C to obtain a corrosion-resistant cable material as the outer sheath material of the energy storage cable.

[0030] S5: Twisted tinned copper wire is used as the conductive core, ceramic silicone rubber is coated on the outside of the conductive core to form an insulation layer, tinned wire is braided on the outside of the insulation layer by a cable braiding machine to form a shielding layer, silicone-based lubricant is applied on the surface of the shielding layer to fill the braiding gaps, and then an extrusion machine is used to extrude the outer sheath material on the surface of the shielding layer to form an outer sheath, thereby obtaining an energy storage cable.

[0031] Example 2: This example provides a corrosion-resistant cable material, an energy storage cable, and a preparation method thereof, comprising the following steps: S1: 15 g of bentonite ore and 300 mL of distilled water were added to a reactor, ultrasonically dispersed for 20 min, centrifuged, and the resulting solid was dried, ground, and passed through a 200-mesh sieve. The temperature was raised to 350°C at 5°C / min in an air atmosphere, and calcined for 2 h. After cooling, the calcined bentonite was placed in 150 mL of 1 mol / L acetic acid solution and ultrasonically dispersed for 20 min. The mixture was reacted at 80°C for 2 h, centrifuged, filtered, and the filter cake was washed with deionized water until the final washing solution was neutral, and dried to obtain acidified bentonite; Under nitrogen conditions, 400 mL of DMF and 2 g of graphene powder were added to a reactor, ultrasonically dispersed for 30 min, 8 g of acidified bentonite was added, and the reaction was carried out at 200 rpm and 120 ° C for 3.5 h. After the reaction was completed, centrifugation was carried out, and the filter cake was washed twice with DMF, anhydrous ethanol and deionized water in sequence, dried at 80 ° C for 12 h, and the dried product was ground and passed through a 200 mesh sieve to obtain graphene-modified bentonite.

[0032] S2: Add 2 g of surface modifier hexadecylamine and 60 mL of ethanol to a reactor and stir until dissolved. Add 1.5 g of graphene-modified bentonite and ultrasonically disperse for 20 min. Then react at 80°C for 24 h, centrifuge, take the precipitate, wash it three times with ethanol, and dry it at 55°C for 24 h to obtain a hexadecylamine-functionalized graphene bentonite copolymer.

[0033] S3: Add 5 g of 5-aminosalicylic acid and 500 mL of ethanol to a reactor, stir until dissolved, and react at 170°C for 18 h. After cooling to room temperature, purify the solution using a dialysis bag (molecular weight cutoff of approximately 3.0 kDa). Rotary evaporate the resulting solution to remove ethanol and dry it at 60°C for 10 h to obtain nitrogen-doped quantum dot powder. 1 g of nitrogen-doped quantum dot powder and 40 mL of ethanol were added to a reactor and ultrasonically treated for 20 min. 4 g of EP-128W water-based curing agent was added and stirred at 300 rpm for 30 min. The ethanol was removed by rotary evaporation to obtain a viscous mixture. 3 g of epoxy resin E51 was added to the mixture and vigorously stirred at a high speed of 4000 rpm for 5 min to obtain modified epoxy resin E51.

[0034] S4: Pour 1g of hexadecylamine functionalized graphene bentonite copolymer, 2g of modified epoxy resin E51, 2g of chlorinated polyethylene, 0.3g of plasticizer dioctyl terephthalate, 0.08g of polyethylene wax, 0.2g of mica powder and 0.02g of antioxidant 1024 into a high-speed blender, stir at 800 rpm for 30 minutes at 25°C, then stir at 3500 rpm for 30 minutes at 65°C, melt the obtained mixture at 200°C, and injection mold it at 130°C to obtain a corrosion-resistant cable material as the outer sheath material of the energy storage cable.

[0035] S5: Twisted tinned copper wire is used as the conductive core, ceramic silicone rubber is coated on the outside of the conductive core to form an insulation layer, tinned wire is braided on the outside of the insulation layer by a cable braiding machine to form a shielding layer, silicone-based lubricant is applied on the surface of the shielding layer to fill the braiding gaps, and then an extrusion machine is used to extrude the outer sheath material on the surface of the shielding layer to form an outer sheath, thereby obtaining an energy storage cable.

[0036] Example 3: This example provides a corrosion-resistant cable material, an energy storage cable, and a preparation method thereof, comprising the following steps: S1: 25 g of bentonite ore and 500 mL of distilled water were added to a reactor, ultrasonically dispersed for 20 min, centrifuged, and the resulting solid was dried, ground, and passed through a 200-mesh sieve. The temperature was raised to 450°C at 5°C / min in an air atmosphere, and calcined for 1.5 h. After cooling, the calcined bentonite was placed in 220 mL of 1.5 mol / L acetic acid solution and ultrasonically dispersed for 30 min. The mixture was reacted at 85°C for 2 h, centrifuged, filtered, and the filter cake was washed with deionized water until the final washing solution was neutral, and dried to obtain acidified bentonite; Under nitrogen conditions, 600 mL of DMF and 4 g of graphene powder were added to the reactor, ultrasonically dispersed for 50 min, 12 g of acidified bentonite was added, and the reaction was carried out at 300 rpm and 120 ° C for 4.5 h. After the reaction was completed, centrifugation was carried out, and the filter cake was washed twice with DMF, anhydrous ethanol and deionized water in sequence, dried at 80 ° C for 12 h, and the dried product was ground and passed through a 200 mesh sieve to obtain graphene-modified bentonite.

[0037] S2: 4 g of surface modifier hexadecylamine and 90 mL of ethanol were added to a reactor and stirred until dissolved. 2.5 g of graphene-modified bentonite was added and ultrasonically dispersed for 30 min. The mixture was then reacted at 90 °C for 20 h. The mixture was centrifuged and the precipitate was washed three times with ethanol and dried at 55 °C for 24 h to obtain a hexadecylamine-functionalized graphene-bentonite copolymer.

[0038] S3: 8 g of 5-aminosalicylic acid and 800 mL of ethanol were added to a reactor, stirred until dissolved, and reacted at 180°C for 18 h. After cooling naturally to room temperature, the solution was purified using a dialysis bag (molecular weight cut-off of approximately 3.0 kDa). The resulting solution was rotary evaporated to remove ethanol and dried at 60°C for 10 h to obtain nitrogen-doped quantum dot powder. 1 g of nitrogen-doped quantum dot powder and 40 mL of ethanol were added to a reactor and ultrasonically treated for 20 min. 4 g of EP-128W water-based curing agent was added and stirred at 300 rpm for 30 min. The ethanol was removed by rotary evaporation to obtain a viscous mixture. 3 g of epoxy resin E51 was added to the mixture and vigorously stirred at a high speed of 3000 rpm for 5 min to obtain modified epoxy resin E51.

[0039] S4: Pour 2g of hexadecylamine functionalized graphene bentonite copolymer, 3g of modified epoxy resin E51, 3g of chlorinated polyethylene, 0.8g of plasticizer dioctyl terephthalate, 0.2g of polyethylene wax, 0.3g of mica powder and 0.05g of antioxidant 1024 into a high-speed mixer, stir at 900 rpm for 30 minutes at 25°C, and then stir at 3500 rpm for 30 minutes at 70°C. Melt the obtained mixture at 300°C and injection mold it at 130°C to obtain a corrosion-resistant cable material as the outer sheath material of the energy storage cable.

[0040] S5: Twisted tinned copper wire is used as the conductive core, ceramic silicone rubber is coated on the outside of the conductive core to form an insulation layer, tinned wire is braided on the outside of the insulation layer by a cable braiding machine to form a shielding layer, silicone-based lubricant is applied on the surface of the shielding layer to fill the braiding gaps, and then an extrusion machine is used to extrude the outer sheath material on the surface of the shielding layer to form an outer sheath, thereby obtaining an energy storage cable.

[0041] Comparative Example 1: The difference from Example 1 is that the graphene modification step in S1 is omitted, and the acidified bentonite is directly substituted for the graphene-modified bentonite in S2, and the other steps remain unchanged to obtain an energy storage cable.

[0042] Comparative Example 2: The difference from Example 1 is that the treatment process of hexadecylamine in S2 is omitted, and the hexadecylamine functionalized graphene bentonite copolymer in S4 is directly replaced by graphene-modified bentonite, and the other steps remain unchanged to obtain an energy storage cable.

[0043] Comparative Example 3: The difference from Example 1 is that the preparation of nitrogen-doped quantum dot powder in S3 is omitted, and epoxy resin E51 is directly substituted for unmodified epoxy resin E51 prepared in S4, and the other steps remain unchanged to obtain an energy storage cable.

[0044] Comparative Example 4: The difference from Example 1 is that the coating of the shielding layer surface with a silicone-based lubricant in S5 is omitted, and the outer sheath material is directly covered on the shielding layer surface. The other steps remain unchanged, thereby obtaining an energy storage cable.

[0045] Performance test experiment: Performance tests were performed on Examples 1 to 3 and Comparative Examples 1 to 4.

[0046] (1) Waterproof performance test: The outer sheath materials of the energy storage cables in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared into samples, respectively. The different samples were soaked in clean water for 15 days, and then the samples were tested.

[0047] (2) Corrosion resistance test: The energy storage cable samples were immersed in 20wt% hydrochloric acid solution, 20wt% NaOH solution, 20wt% NaCl solution and aqueous solution under the same conditions for 7 days. The samples were taken out and the surface corrosion was observed.

[0048] (3) Mechanical strength test: The tensile properties of the energy storage cable are tested according to the method of GB / T1040.1-2008; the cable is placed in a hot air heating box and heat aged at 180 degrees Celsius for 240 hours, and then the tensile properties are tested.

[0049] Table 1 Statistics of performance test data of each sample

[0050] As shown in Table 1, the waterproof properties of Examples 1 to 3 are all non-penetrating, the tensile strength (before aging) is between 28.9-29.7 MPa, and the tensile strength (after aging) is between 28.2-29.2 MPa. In addition, there is no corrosion in hydrochloric acid solution, NaOH solution, NaCl solution, and aqueous solution. The overall performance is better than that of Comparative Examples 1 to 4. The specific differences and reasons are as follows: Comparative Example 1, which omitted the graphene modification step and directly replaced the graphene-modified bentonite with acidified bentonite, showed significantly lower tensile strength (24.5 MPa before aging and 23.0 MPa after aging) than the examples. Graphene possesses extremely high mechanical strength, and its composite structure with bentonite can create an efficient mechanical support system. However, due to the lack of graphene's reinforcing effect, the tensile strength of the material in Comparative Example 1 was significantly weakened. Furthermore, the lack of graphene's stable structural support during aging led to more pronounced performance degradation.

[0051] Comparative Example 2 omits the hexadecylamine treatment and directly replaces the hexadecylamine functionalized graphene bentonite copolymer with graphene-modified bentonite. The long-chain alkyl group of hexadecylamine can give the material excellent hydrophobicity and chemical stability, reduce the penetration of corrosive media, and its amino group combines with the hydroxyl group of the graphene-modified bentonite and the oxygen-containing functional groups at the edge of the graphene to enhance the interfacial affinity. Due to the lack of hydrophobic protection of hexadecylamine, Comparative Example 2 suffers from waterproof breakdown and is severely corroded in hydrochloric acid, NaOH, and NaCl solutions. At the same time, the decrease in interfacial bonding force causes the tensile strength to be slightly lower than that of the embodiment.

[0052] Comparative Example 3 omits the preparation of nitrogen-doped quantum dots and replaces the modified epoxy resin with unmodified epoxy resin E51. On the one hand, the quantum dots are nanometer-sized and can be evenly dispersed in the epoxy resin to fill the micropores and microcracks of the matrix itself. On the other hand, the amino groups introduced on the surface of the quantum dots can attack the electrophilic carbon of the epoxy group in the epoxy resin E51 through lone pairs of electrons to form a carbamate covalent bond. The tensile strength of Comparative Example 3 is slightly lower than that of the embodiment, and the corrosion resistance is poor (severe corrosion by hydrochloric acid, NaOH, and NaCl solutions). Because the unmodified epoxy resin has a low degree of cross-linking and many structural defects, it not only lacks mechanical support, but also has difficulty in preventing the penetration of corrosive media.

[0053] In Comparative Example 4, the silicone-based lubricant on the surface of the shielding layer is omitted and the outer protective layer is directly covered. The silicone-based lubricant can fill the weaving gaps of the shielding layer, reduce the interface friction between the outer protective layer and the shielding layer, and enhance the bonding force between the layers. The tensile strength of Comparative Example 4 is lower than that of the embodiment. Due to the lack of lubricant, the stress concentration at the interface between the outer protective layer and the shielding layer is caused. When subjected to force, interlayer slippage is likely to occur, thereby reducing the overall tensile strength.

[0054] It should be noted that, in this document, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0055] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A corrosion-resistant cable material, characterized in that: The following raw materials are contained in parts by weight: 10-20 parts of hexadecylamine functionalized graphene bentonite copolymer, 20-30 parts of modified epoxy resin E51, 20-30 parts of chlorinated polyethylene, 3-8 parts of plasticizer, 0.8-2 parts of paraffin wax, 2-3 parts of mica powder and 0.2-0.5 parts of antioxidant; The hexadecylamine functionalized graphene bentonite copolymer is prepared by the following steps: Step 1: Pre-treating the bentonite ore and reacting it with an acetic acid solution to obtain acidified bentonite; adding the acidified bentonite to a graphene powder dispersion under nitrogen conditions and stirring to react to obtain graphene-modified bentonite; Step 2: hydrophobically modifying the graphene-modified bentonite with hexadecylamine to obtain a hexadecylamine-functionalized graphene-bentonite copolymer.

2. A corrosion-resistant cable material according to claim 1, characterized in that: The specific preparation process of the graphene-modified bentonite is as follows: Under nitrogen conditions, DMF and graphene powder were added to a reactor, ultrasonically dispersed, and acidified bentonite was added. The mixture was stirred at 120-140° C. for 4 h. After the reaction was completed, the mixture was centrifuged, and the filter cake was washed, dried, ground, and passed through a 200-mesh sieve to obtain graphene-modified bentonite. The usage ratio of the DMF, graphene powder and acidified bentonite is 400-600 mL: 2-4 g: 8-12 g.

3. A corrosion-resistant cable material according to claim 2, characterized in that: The specific preparation process of the acidified bentonite is as follows: Adding bentonite ore and deionized water into a reactor, ultrasonically dispersing for 20-30 minutes, centrifuging, drying, grinding, passing through a 200-mesh sieve, transferring to a tube furnace, and calcining for 1.5 hours to 2 hours at 350-450° C. in an air atmosphere, cooling, ultrasonically dispersing the calcined bentonite in a 0.5 mol / L acetic acid solution for 20-40 minutes, reacting at 80-90° C. for 1-2 hours, centrifuging, filtering, washing the filter cake with deionized water until the final washing solution is neutral, and drying to obtain acidified bentonite; The usage ratio of the bentonite ore, deionized water and acetic acid solution is 15-25 g: 300-500 mL: 150-220 mL.

4. The corrosion-resistant cable material according to claim 1, characterized in that: The specific preparation process of the hexadecylamine functionalized graphene bentonite copolymer is as follows: Add the surface modifier hexadecylamine and ethanol to a reactor, stir until dissolved, add graphene-modified bentonite, ultrasonically disperse for 20-40 minutes, react at 80-90°C for 20-24 hours, centrifuge, take the precipitate, wash it with ethanol 3-4 times, and dry it at 55-65°C for 24-32 hours to obtain a hexadecylamine-functionalized graphene-bentonite copolymer; The usage ratio of hexadecylamine, ethanol and graphene-modified bentonite is 2-4 g: 60-90 mL: 1.5-2.5 g.

5. The corrosion-resistant cable material according to claim 1, characterized in that: The modified epoxy resin E51 is prepared by the following steps: Nitrogen-doped quantum dot powder and ethanol were added to a reactor, ultrasonically treated for 20-30 minutes, a water-based curing agent was added, and the mixture was stirred at 300-400 rpm for 30-50 minutes. The ethanol was removed by rotary evaporation to obtain a viscous mixture. Epoxy resin E51 was added to the mixture, and stirred at 3000-4000 rpm for 5-8 minutes to obtain modified epoxy resin E51.

6. The corrosion-resistant cable material according to claim 5, characterized in that: The usage ratio of the nitrogen-doped quantum dot powder, ethanol, water-based curing agent and epoxy resin E51 is 0.5-1 g: 20-40 mL: 3-4 g: 2-3 g.

7. The corrosion-resistant cable material according to claim 5, characterized in that: The specific preparation process of the nitrogen-doped quantum dot powder is as follows: 5-aminosalicylic acid and ethanol were added to a reactor, stirred until dissolved, reacted at 170-180°C for 16-18 hours, cooled naturally to room temperature, and purified using a dialysis bag with a molecular weight cutoff of 3.0 kDa. The resulting solution was rotary evaporated to remove ethanol and dried to obtain nitrogen-doped quantum dot powder; The usage ratio of the 5-aminosalicylic acid and ethanol is 5-8 g: 500-800 mL.

8. The corrosion-resistant cable material according to claim 1, characterized in that: The preparation method of corrosion-resistant cable material is as follows: Hexadecylamine functionalized graphene bentonite copolymer, modified epoxy resin E51, chlorinated polyethylene, plasticizer, paraffin wax, mica powder and antioxidant are poured into a high-speed mixer, stirred at 25-30°C and 800-900 rpm for 20-30 minutes, then stirred at 70-80°C and 3000-4000 rpm for 20-30 minutes, the obtained mixture is melted at 250-300°C, and injection molded at 100-150°C to obtain a corrosion-resistant cable material.

9. A method for preparing an energy storage cable, characterized in that: The steps include: The energy storage cable is manufactured by using twisted tinned copper wire as the conductive core, coating the conductive core with ceramic silicone rubber to form an insulating layer, weaving tinned wires on the insulating layer using a cable braiding machine to form a shielding layer, applying a silicone-based lubricant on the surface of the shielding layer to fill the braiding gaps, and then using an extrusion machine to extrude the outer sheath material on the surface of the shielding layer to form an outer sheath. The outer sheath material is the corrosion-resistant cable material according to any one of claims 1 to 8.

10. An energy storage cable, prepared by the method for preparing an energy storage cable according to claim 9.

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