An anti-aging and corrosion-resistant flexible graphene cable

Abstract

The present invention relates to an anti-aging and corrosion-resistant flexible graphene cable, belonging to the technical field of cables. An anti-aging and corrosion-resistant flexible graphene cable includes a conductive wire group, a metal shielding layer, and a protective layer, characterized in that the protective layer comprises the following components: high-density polyethylene, modified graphene, and other additives; the other additives are composed of an anti-UV agent, a lubricant, and an antioxidant. The cable material prepared by the present invention has excellent anti-aging performance, mechanical properties, and corrosion resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables and relates to an anti-aging and corrosion-resistant flexible graphene cable. Background Art

[0002] In practical applications, cables may come into contact with various oils, greases, and chemical substances and be subjected to mechanical wear. Therefore, they must possess excellent corrosion resistance, high strength, and bending resistance. Ensuring high strength is aimed at preventing the cable outer sheath from being rapidly worn out due to frequent friction, thereby effectively avoiding the exposure of internal conductors and potential short-circuit risks. Strengthening the bending resistance ensures that the cable can maintain the integrity of its structure and the stability of its electrical performance even under extreme bending conditions, which is of inestimable importance for maintaining the continuous operation and safety of automated systems.

[0003] The outer layer of cables is generally made of polyethylene material. Polyethylene is a low-cost, lightweight, and non-toxic general-purpose plastic, but it has disadvantages such as high brittleness at low temperatures, low mechanical strength and hardness, large molding shrinkage rate, poor toughness, poor corrosion resistance, easy aging, and poor heat resistance.

[0004] As a new type of two-dimensional material, graphene has been widely used in polyethylene cable protection materials due to its unique physical and chemical properties. The addition of graphene significantly improves the mechanical properties and corrosion resistance of polyethylene cable protection materials. Due to its high strength and high modulus characteristics, graphene improves the deformation resistance of polyethylene cable protection materials, extends the service life of cables, and enhances their reliability. At the same time, the corrosion resistance of graphene protects the cables from chemical erosion and maintains their performance in harsh environments. However, the high production cost of graphene and its poor dispersibility in polyethylene materials affect the uniform distribution and overall performance of the materials, limiting their ability to improve mechanical properties and corrosion resistance. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-aging and corrosion-resistant flexible graphene cable. The present invention uses graphene oxide and zinc oxide composite particles, which are then modified by a silane coupling agent. Vinyl groups are introduced onto the surface of the composite particles to participate in the copolymerization reaction of styrene, sorbic acid, and oleic acid to form a coating structure in which an organic copolymer layer coats inorganic fillers, enhancing the binding force and dispersibility of the composite particles in the polyethylene system and improving the mechanical properties and corrosion resistance of the material.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An anti-aging and corrosion-resistant flexible graphene cable, comprising a conductive wire group, a metal shielding layer, and a protective layer. The metal shielding layer wraps the conductive wire group, and an elastic material is filled between the metal shielding layer and the conductive wire group; the protective layer is disposed on the outer surface of the metal shielding layer; the preparation of the graphene cable includes wrapping the conductive wire group with the metal shielding layer, and after melting and extruding the molten protective layer on the outer surface of the metal shielding layer, it is obtained.

[0008] The protective layer comprises the following components by weight: 90-100 parts of high-density polyethylene, 12-16 parts of modified graphene, and 2-3 parts of other additives.

[0009] As a preferred technical solution of the present invention, the other additives are composed of an anti-UV agent, a lubricant, and an antioxidant mixed in a mass ratio of 2.0-2.3:3.5-4.0:2.2-2.6; the anti-UV agent is one or both of UV-9 and BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is one or more of antioxidant 168, antioxidant 1010, antioxidant 1076, and antioxidant 1098.

[0010] As a preferred technical solution of the present invention, the preparation method of the modified graphene comprises the following steps:

[0011] 1) In an inert atmosphere, an aqueous zinc nitrate solution and an aqueous sodium hydroxide solution are slowly added dropwise to graphene oxide to adjust the pH value, filtered, washed, and vacuum dried to constant weight to obtain composite particles;

[0012] 2) The composite particles and absolute ethanol are mixed evenly and preheated, a silane coupling agent is added dropwise, and then stirring is continued, centrifuged, washed, and vacuum dried to constant weight to obtain modified composite particles;

[0013] 3) In an inert atmosphere, the modified composite particles and absolute ethanol are ultrasonically mixed, sorbic acid, styrene, and oleic acid are added and mixed evenly, an initiator is added, heated and stirred, cooled to room temperature, centrifuged, and vacuum dried to constant weight to obtain modified graphene.

[0014] As a preferred technical solution of the present invention, in step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to 7.0-7.8; the washing is with deionized water until neutral; the temperature of the vacuum drying is 80 °C.

[0015] As a preferred technical solution of the present invention, in step 1), the mass ratio of the zinc nitrate solution, the aqueous sodium hydroxide solution, and graphene oxide is 14-16:22-24:7.2-8.0; the concentration of the aqueous sodium hydroxide solution is 8 wt%; the concentration of the aqueous zinc nitrate solution is 6 wt%.

[0016] As a preferred technical solution of the present invention, in step 2), the preheating temperature is 40°C; the continued stirring is stirring at 50-60°C and 300-400 r / min for 180-240 min; the washing is washing with anhydrous ethanol three times; and the vacuum drying temperature is 80°C.

[0017] As a preferred technical solution of the present invention, in step 2), the mass ratio of the composite particles, anhydrous ethanol and silane coupling agent is 2.0-2.4:20-25:0.4-0.5; and the silane coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0018] As a preferred technical solution of the present invention, in step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is performed at a power of 300-400 W for 15-20 min; the heating and stirring is performed at a temperature of 60-65° C. and a speed of 300-400 r / min for 6-8 h; and the vacuum drying temperature is 80° C.

[0019] As a preferred technical solution of the present invention, in step 3), the mass ratio of the modified composite particles, anhydrous ethanol, sorbic acid, styrene, oleic acid and initiator is 12-14:40-50:3.2-4.0:1.2-1.6:2.0-2.4:0.16-0.18; the initiator is azobisisobutyronitrile.

[0020] As a preferred technical solution of the present invention, the preparation method of the protective layer includes mixing high-density polyethylene, modified graphene and other additives for 20-30 minutes, placing them in an extruder for melt extrusion at a temperature of 190-210°C, granulating, and shaping to obtain the protective layer.

[0021] Beneficial effects of the present invention:

[0022] The present invention utilizes graphene oxide and zinc oxide composite particles, which are then modified with a silane coupling agent. Vinyl groups are introduced into the surface of the composite particles, which participate in the copolymerization reaction of styrene, sorbic acid and oleic acid to form an organic copolymer layer coating an inorganic filler. This enhances the bonding strength and dispersibility of the composite particles with the polyethylene system, and improves the mechanical properties and corrosion resistance of the material. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0024] An anti-aging and corrosion-resistant flexible graphene cable, comprising a conductive wire group, a metal shielding layer and a protective layer, wherein the metal shielding layer wraps the conductive wire group, and an elastic material is filled between the metal shielding layer and the conductive wire group; the protective layer is provided on the outer surface of the metal shielding layer; the preparation of the graphene cable includes wrapping the metal shielding layer around the conductive wire group, and then extruding the molten protective layer on the outer surface of the metal shielding layer by melting, thus obtaining the cable.

[0025] Example 1

[0026] The protective layer comprises the following components by weight: 90 parts of high-density polyethylene, 12 parts of modified graphene and 2 parts of other additives;

[0027] The other additives are composed of a UV-resistant agent, a lubricant and an antioxidant mixed in a mass ratio of 2.0:3.5:2.2; the UV-resistant agent is BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is composed of antioxidant 168 and antioxidant 1010 mixed in a mass ratio of 1:2.

[0028] The preparation method of the modified graphene comprises the following steps:

[0029] 1) In an inert atmosphere, an aqueous solution of zinc nitrate and an aqueous solution of sodium hydroxide are slowly added dropwise to graphene oxide to adjust the pH value, followed by filtration, washing, and vacuum drying to constant weight to obtain composite particles;

[0030] 2) The composite particles and absolute ethanol are mixed evenly and then preheated. After dropping a silane coupling agent, stirring is continued, followed by centrifugation, washing, and vacuum drying to constant weight to obtain modified composite particles;

[0031] 3) In an inert atmosphere, the modified composite particles and absolute ethanol are ultrasonically mixed, then sorbic acid, styrene and oleic acid are added and mixed evenly. An initiator is added and heated with stirring. After cooling to room temperature, centrifugation and vacuum drying to constant weight are carried out to obtain modified graphene.

[0032] In step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to 7.0; the washing is carried out with deionized water until neutral; the temperature of the vacuum drying is 80 °C; the mass ratio of the zinc nitrate solution, the sodium hydroxide aqueous solution and graphene oxide is 14:22:7.2; the concentration of the sodium hydroxide aqueous solution is 8 wt%; the concentration of the zinc nitrate aqueous solution is 6 wt%.

[0033] In step 2), the preheating temperature is 40 °C; the continuous stirring is carried out at 50 °C and 300 r / min for 180 min; the washing is carried out with anhydrous ethanol three times; the vacuum drying temperature is 80 °C; the mass ratio of the composite particles, anhydrous ethanol and silane coupling agent is 2.0:20:0.4; the silane coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0034] In step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is carried out at a power of 300 W for 15 min; the heating and stirring are carried out at 60 °C and a rotation speed of 300 r / min for 6 h; the vacuum drying temperature is 80 °C; the mass ratio of the modified composite particles, anhydrous ethanol, sorbic acid, styrene, oleic acid and initiator is 12:40:3.2:1.2:2.0:0.16; the initiator is azobisisobutyronitrile.

[0035] The preparation method of the protective layer includes mixing high-density polyethylene, modified graphene and other additives for 20 min, then placing them in an extruder and melt-extruding at 190 °C, granulating, and shaping to obtain the product.

[0036] Example 2

[0037] The protective layer comprises the following components by weight: 92 parts of high-density polyethylene, 13 parts of modified graphene and 2.2 parts of other additives;

[0038] The other additives are composed of a UV-resistant agent, a lubricant and an antioxidant mixed in a mass ratio of 2.1:3.6:2.3; the UV-resistant agent is BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is composed of antioxidant 168 and antioxidant 1010 mixed in a mass ratio of 1:2.

[0039] The preparation method of the modified graphene includes the following steps:

[0040] 1) Under an inert atmosphere, an aqueous solution of zinc nitrate and an aqueous solution of sodium hydroxide are slowly added dropwise to graphene oxide to adjust the pH value, filtered, washed, and vacuum dried to constant weight to obtain composite particles;

[0041] 2) The composite particles and anhydrous ethanol are mixed evenly and preheated, then a silane coupling agent is added and stirring is continued, centrifuged, washed, and vacuum dried to constant weight to obtain modified composite particles;

[0042] 3) Under an inert atmosphere, the modified composite particles and anhydrous ethanol are ultrasonically mixed, then sorbic acid, styrene and oleic acid are added and mixed evenly, an initiator is added and heated and stirred, cooled to room temperature, centrifuged, and vacuum dried to constant weight to obtain modified graphene.

[0043] In step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to 7.2; the washing is carried out with deionized water until neutral; the temperature of the vacuum drying is 80 °C; the mass ratio of the zinc nitrate solution, the sodium hydroxide aqueous solution and graphene oxide is 14.5:22.5:7.4; the concentration of the sodium hydroxide aqueous solution is 8 wt%; the concentration of the zinc nitrate aqueous solution is 6 wt%.

[0044] In step 2), the preheating temperature is 40 °C; the continuous stirring is carried out at a temperature of 52 °C and a speed of 320 r / min for 190 min; the washing is carried out with anhydrous ethanol 3 times; the temperature of the vacuum drying is 80 °C; the mass ratio of the composite particles, anhydrous ethanol and silane coupling agent is 2.1:21:0.43; the silane coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0045] In step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is carried out at a power of 320 W for 16 min; the heating and stirring is carried out at a temperature of 61 °C and a speed of 320 r / min for 6.5 h; the temperature of the vacuum drying is 80 °C; the mass ratio of the modified composite particles, anhydrous ethanol, sorbic acid, styrene, oleic acid and initiator is 12.5:42:3.4:1.3:2.1:0.17; the initiator is azobisisobutyronitrile.

[0046] The preparation method of the protective layer includes mixing high-density polyethylene, modified graphene and other additives for 22 min, then placing them in an extruder and melt-extruding at a temperature of 195 °C, granulating, and shaping to obtain the product.

[0047] Example 3

[0048] The protective layer comprises the following components by weight: 95 parts of high-density polyethylene, 14 parts of modified graphene and 2.5 parts of other additives;

[0049] The other additives are composed of an anti-UV agent, a lubricant and an antioxidant mixed in a mass ratio of 2.2:3.8:2.4; the anti-UV agent is BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is composed of antioxidant 168 and antioxidant 1010 mixed in a mass ratio of 1:2.

[0050] The preparation method of the modified graphene includes the following steps:

[0051] 1) Under an inert atmosphere, slowly drop the zinc nitrate aqueous solution and the sodium hydroxide aqueous solution into graphene oxide to adjust the pH value, filter, wash, and vacuum dry to constant weight to obtain composite particles;

[0052] 2) After mixing the composite particles and absolute ethanol evenly, preheat them. After adding the silane coupling agent, continue stirring, then centrifuge, wash, and vacuum dry to constant weight to obtain modified composite particles;

[0053] 3) Under an inert atmosphere, ultrasonically mix the modified composite particles and absolute ethanol, then add sorbic acid, styrene, and oleic acid and mix evenly. Add the initiator, heat and stir, cool to room temperature, then centrifuge and vacuum dry to constant weight to obtain modified graphene.

[0054] In step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to 7.4; the washing is with deionized water until neutral; the temperature of the vacuum drying is 80 °C; the mass ratio of the zinc nitrate solution, sodium hydroxide aqueous solution, and graphene oxide is 15:23:7.6; the concentration of the sodium hydroxide aqueous solution is 8 wt%; the concentration of the zinc nitrate aqueous solution is 6 wt%.

[0055] In step 2), the temperature of the preheating is 40 °C; the continued stirring is at 55 °C and 350 r / min for 210 min; the washing is with absolute ethanol 3 times; the temperature of the vacuum drying is 80 °C; the mass ratio of the composite particles, absolute ethanol, and silane coupling agent is 2.2:22:0.45; the silane coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0056] In step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is at a power of 350 W for 18 min; the heating and stirring are at 62 °C and 350 r / min for 7 h; the temperature of the vacuum drying is 80 °C; the mass ratio of the modified composite particles, absolute ethanol, sorbic acid, styrene, oleic acid, and initiator is 13:45:3.6:1.4:2.2:0.17; the initiator is azobisisobutyronitrile.

[0057] The preparation method of the protective layer includes kneading high-density polyethylene, modified graphene, and other additives for 25 min, then placing them in an extruder and melt-extruding at 200 °C, granulating, and shaping to obtain it.

[0058] Example 4

[0059] The protective layer includes the following components by weight: 98 parts of high-density polyethylene, 15 parts of modified graphene, and 2.8 parts of other additives;

[0060] The other additives are composed of a UV-resistant agent, a lubricant, and an antioxidant mixed in a mass ratio of 2.3:3.9:2.5; the UV-resistant agent is BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is composed of antioxidant 168 and antioxidant 1010 mixed in a mass ratio of 1:2.

[0061] The preparation method of the modified graphene includes the following steps:

[0062] 1) Under an inert atmosphere, an aqueous solution of zinc nitrate and an aqueous solution of sodium hydroxide are slowly added dropwise to graphene oxide to adjust the pH value, followed by filtration, washing, and vacuum drying to constant weight to obtain composite particles.

[0063] 2) The composite particles and absolute ethanol are mixed evenly and preheated, then a silane coupling agent is added dropwise and stirring is continued, followed by centrifugation, washing, and vacuum drying to constant weight to obtain modified composite particles.

[0064] 3) Under an inert atmosphere, the modified composite particles and absolute ethanol are ultrasonically mixed, then sorbic acid, styrene, and oleic acid are added and mixed evenly, and an initiator is added and heated with stirring. After cooling to room temperature, centrifugation and vacuum drying to constant weight are carried out to obtain modified graphene.

[0065] In step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to 7.6; the washing is carried out with deionized water until neutral; the temperature of the vacuum drying is 80 °C; the mass ratio of the zinc nitrate solution, the sodium hydroxide aqueous solution, and graphene oxide is 15.5:23.5:7.8; the concentration of the sodium hydroxide aqueous solution is 8 wt%; the concentration of the zinc nitrate aqueous solution is 6 wt%.

[0066] In step 2), the preheating temperature is 40 °C; the continued stirring is carried out at a temperature of 58 °C and a speed of 370 r / min for 220 min; the washing is carried out 3 times with absolute ethanol; the temperature of the vacuum drying is 80 °C; the mass ratio of the composite particles, absolute ethanol, and silane coupling agent is 2.3:24:0.48; the silane coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0067] In step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is carried out at a power of 370 W for 19 min; the heating and stirring are carried out at a temperature of 64 °C and a rotation speed of 370 r / min for 7.5 h; the temperature of the vacuum drying is 80 °C; the mass ratio of the modified composite particles, absolute ethanol, sorbic acid, styrene, oleic acid, and initiator is 13.5:48:3.8:1.5:2.3:0.17; the initiator is azobisisobutyronitrile.

[0068] The preparation method of the protective layer includes mixing high-density polyethylene, modified graphene, and other additives for 28 min, then placing them in an extruder and melt-extruding at a temperature of 205 °C, granulating, and shaping to obtain the product.

[0069] Example 5

[0070] The protective layer comprises the following components by weight: 100 parts of high-density polyethylene, 16 parts of modified graphene, and 3 parts of other additives;

[0071] The other additives are formed by mixing an anti-UV agent, a lubricant, and an antioxidant in a mass ratio of 2.3:4.0:2.6; the anti-UV agent is BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is formed by mixing antioxidant 168 and antioxidant 1010 in a mass ratio of 1:2.

[0072] The preparation method of the modified graphene comprises the following steps:

[0073] 1) In an inert atmosphere, an aqueous zinc nitrate solution and an aqueous sodium hydroxide solution are slowly added dropwise to graphene oxide to adjust the pH value, followed by filtration, washing, and vacuum drying to constant weight to obtain composite particles;

[0074] 2) The composite particles and absolute ethanol are mixed evenly and then preheated. After adding a silane coupling agent, stirring is continued, followed by centrifugation, washing, and vacuum drying to constant weight to obtain modified composite particles;

[0075] 3) In an inert atmosphere, the modified composite particles and absolute ethanol are ultrasonically mixed, and then sorbic acid, styrene, and oleic acid are added and mixed evenly. An initiator is added, and heating and stirring are carried out. After cooling to room temperature, centrifugation and vacuum drying to constant weight are carried out to obtain modified graphene.

[0076] In step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to 7.8; the washing is carried out with deionized water until neutral; the temperature of the vacuum drying is 80°C; the mass ratio of the zinc nitrate solution, the aqueous sodium hydroxide solution, and graphene oxide is 16:24:8.0; the concentration of the aqueous sodium hydroxide solution is 8 wt%; the concentration of the aqueous zinc nitrate solution is 6 wt%.

[0077] In step 2), the preheating temperature is 40°C; the continued stirring is carried out at 60°C and 400 r / min for 240 min; the washing is carried out 3 times with absolute ethanol; the temperature of the vacuum drying is 80°C; the mass ratio of the composite particles, absolute ethanol, and silane coupling agent is 2.4:25:0.5; the silane coupling agent is γ-methacryloxypropyltrimethoxysilane.

[0078] In step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is carried out at a power of 400 W for 20 min; the heating and stirring are carried out at 65°C and 400 r / min for 8 h; the temperature of the vacuum drying is 80°C; the mass ratio of the modified composite particles, absolute ethanol, sorbic acid, styrene, oleic acid, and initiator is 14:50:4.0:1.6:2.4:0.18; the initiator is azobisisobutyronitrile.

[0079] The preparation method of the protective layer includes mixing high-density polyethylene, modified graphene and other additives for 30 minutes, then placing them in an extruder and melt-extruding at a temperature of 210 °C, granulating, and shaping to obtain the product.

[0080] Comparative Example 1

[0081] Compared with Example 4, the difference in Comparative Example 1 is that an aqueous zinc nitrate solution is not used, and the other components, preparation steps and parameters are the same.

[0082] Comparative Example 2

[0083] Compared with Example 4, the difference in Comparative Example 2 is that a silane coupling agent is not used, and the other components, preparation steps and parameters are the same.

[0084] Comparative Example 3

[0085] Compared with Example 4, the difference in Comparative Example 3 is that sorbic acid is not used, and the other components, preparation steps and parameters are the same.

[0086] Comparative Example 4

[0087] Compared with Example 4, the difference in Comparative Example 4 is that styrene is not used, and the other components, preparation steps and parameters are the same.

[0088] Comparative Example 5

[0089] Compared with Example 4, the difference in Comparative Example 5 is that oleic acid is not used, and the other components, preparation steps and parameters are the same.

[0090] The protective layer materials prepared in Examples 1-5 and Comparative Examples 1-5 were respectively subjected to mechanical property tests, and the test results are shown in Table 1.

[0091] Mechanical property test: According to GB / T 2951.11-2008;

[0092] Corrosion resistance test: After weighing the sample materials of Examples 1-5 and Comparative Examples 1-5 respectively, the acid treatment was to completely immerse them in 10 wt% hydrochloric acid at 60 °C for 48 h; the alkali treatment was to completely immerse them in 10 wt% potassium hydroxide solution at 60 °C for 48 h. After soaking, they were washed with deionized water, dried, weighed, and the weight loss rate was calculated.

[0093] Table 1

[0094]

[0095] It can be seen from the test results in Table 1 that compared with Comparative Examples 1-5, the protective layer materials prepared by the present invention have excellent mechanical properties and corrosion resistance.

[0096] In the present invention, the two-dimensional structure of graphene oxide can provide a physical barrier, and zinc oxide can form a more stable and effective protective layer by generating zinc salts, thereby improving the corrosion resistance of the protective layer; zinc oxide is in-situ generated on the surface of graphene oxide to form composite particles, which can improve the surface activity of graphene oxide, reduce its own agglomeration phenomenon, and increase its dispersibility in the system. The generation of zinc oxide on the surface of graphene oxide effectively fills its microporous structure. The combination of the two can effectively improve the compactness of the structure of the protective layer material, and improve its mechanical strength and elongation at break; by using the modification of silane coupling agent, vinyl groups are introduced on the surface of the composite particles in the present invention, enabling the composite particles to participate in the copolymerization reaction among sorbic acid, styrene and oleic acid to form an organic copolymer layer, increasing the binding force between the composite particles and the organic copolymer layer, further increasing the dispersibility and compatibility of the composite particles in the polyethylene system, improving the tensile strength and elongation at break of the protective layer material, making the formed structure more compact, and improving its corrosion resistance effect; then styrene is used to increase the grafting rate of sorbic acid and oleic acid, and combined with the hydrogen bond, ionic bond and coordination bond forces between sorbic acid, oleic acid and zinc ions, physical cross-linking is formed at one end of the organic copolymer layer, and chemical connection is formed at the other end through copolymerization reaction, so as to increase the interaction between the composite particles and the polyethylene system, facilitate the dispersion of the composite particles in the polyethylene system. The combination of sorbic acid and zinc ions can promote the crystallization of polyethylene to form finer and more uniform crystal grains. Oleic acid with antioxidant properties has a long carbon chain with good hydrophobicity, reducing the penetration of water molecules, jointly improving the mechanical properties and corrosion resistance of the protective layer material.

[0097] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content within the scope of the technical solution of the present invention to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any indirect modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A flexible graphene cable resistant to aging and corrosion, comprising a conductive wire group, a metal shielding layer and a protective layer, characterized in that, The protective layer comprises the following components by weight parts: 90 - 100 parts of high-density polyethylene, 12 - 16 parts of modified graphene, and 2 - 3 parts of other additives; The preparation method of the modified graphene comprises the following steps: 1) Under an inert atmosphere, an aqueous zinc nitrate solution and an aqueous sodium hydroxide solution are slowly added dropwise to graphene oxide to adjust the pH value, followed by filtration, washing, and vacuum drying to constant weight to obtain graphene oxide and zinc oxide composite particles; 2) The graphene oxide and zinc oxide composite particles and absolute ethanol are mixed evenly and preheated, then a silane coupling agent is added dropwise and stirring is continued, followed by centrifugation, washing, and vacuum drying to constant weight to obtain modified graphene oxide and zinc oxide composite particles; wherein, the silane coupling agent is γ-methacryloxypropyltrimethoxysilane; 3) Under an inert atmosphere, the modified graphene oxide and zinc oxide composite particles and absolute ethanol are ultrasonically mixed, then sorbic acid, styrene, and oleic acid are added and mixed evenly, an initiator is added and heated with stirring, after cooling to room temperature, centrifugation is carried out, and vacuum drying is carried out to constant weight to obtain modified graphene.

2. The anti-aging and corrosion-resistant flexible graphene cable according to claim 1, characterized in that: The other additives are composed of an anti-UV agent, a lubricant, and an antioxidant mixed in a mass ratio of 2.0 - 2.3: 3.5 - 4.0: 2.2 - 2.6; the anti-UV agent is one or both of UV-9 and BP-6; the lubricant is oxidized polyethylene wax; the antioxidant is one or more of antioxidant 168, antioxidant 1010, antioxidant 1076, and antioxidant 1098.

3. The anti-aging and corrosion-resistant flexible graphene cable according to claim 1, characterized in that: In step 1), the inert atmosphere is a nitrogen atmosphere; the pH value is adjusted to a pH value of 7.0 - 7.8; the washing is carried out with deionized water until neutral; the temperature of the vacuum drying is 80°C.

4. A weather-resistant and corrosion-resistant flexible graphene cable according to claim 1, characterized in that: In step 1), the mass ratio of the zinc nitrate solution, the aqueous sodium hydroxide solution, and graphene oxide is 14 - 16: 22 - 24: 7.2 - 8.0; the concentration of the aqueous sodium hydroxide solution is 8 wt%; the concentration of the aqueous zinc nitrate solution is 6 wt%.

5. A weather-resistant and corrosion-resistant flexible graphene cable according to claim 1, characterized in that: In step 2), the temperature of the preheating is 40°C; the continued stirring is carried out at a temperature of 50 - 60°C and a speed of 300 - 400 r / min for 180 - 240 min; the washing is carried out with absolute ethanol 3 times; the temperature of the vacuum drying is 80°C.

6. The anti-aging and corrosion-resistant flexible graphene cable according to claim 1, wherein: In step 2), the mass ratio of the graphene oxide and zinc oxide composite particles, absolute ethanol, and silane coupling agent is 2.0 - 2.4: 20 - 25: 0.4 - 0.

5.

7. The anti-aging and corrosion-resistant flexible graphene cable according to claim 1, wherein: In step 3), the inert atmosphere is a nitrogen atmosphere; the ultrasonic treatment is carried out at a power of 300 - 400 W for 15 - 20 min; the heating and stirring are carried out at a temperature of 60 - 65°C and a speed of 300 - 400 r / min for 6 - 8 h; the temperature of the vacuum drying is 80°C.

8. A weather-resistant and corrosion-resistant flexible graphene cable according to claim 1, characterized in that: In step 3), the mass ratio of the modified graphene oxide and zinc oxide composite particles, absolute ethanol, sorbic acid, styrene, oleic acid, and initiator is 12 - 14: 40 - 50: 3.2 - 4.0: 1.2 - 1.6: 2.0 - 2.4: 0.16 - 0.18; the initiator is azobisisobutyronitrile.

9. A weather-resistant and corrosion-resistant flexible graphene cable according to claim 1, characterized in that: The preparation method of the protective layer includes mixing high-density polyethylene, modified graphene and other additives for 20 - 30 minutes, then placing them in an extruder and melt-extruding at a temperature of 190 - 210 °C, granulating, and shaping to obtain the product.

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