Polymer fiber metallization method

Abstract

The invention relates to a polymer fiber metallization method, and belongs to the technical field of textile. The preparation method comprises the following steps: firstly, coating a carbon nano tube cylindrical object prepared by a floating chemical vapor deposition method on the surface of a polymer fiber by taking the polymer fiber as a base line; then modifying the carbon nanotube coated polymer fiber by using a modifier to obtain a transition layer for enhancing interface bonding; and finally, coating the surface of the modified polymer fiber with a metal layer by using an electrochemical deposition method, so as to obtain the metalized polymer fiber. The method provided by the invention is simple, reliable, safe, environment-friendly and easy to operate, industrial production can be realized, and the prepared composite fiber has the advantages of light weight, high conductivity and good machinability.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and particularly relates to a method for metallizing polymer fibers. Background Art

[0002] In recent years, the rapid development of flexible wearable electronic devices has urgently required lightweight and highly conductive fibers. Polymer fibers have the characteristics of light weight and flexibility, and are ideal substrates for constructing wearable electronic devices. However, traditional polymer fibers such as cotton, linen, aramid fibers, and nylon fibers do not have conductive properties, which limits their development and application in the field of flexible wearables. Metallizing the surface of polymer fibers can not only retain their inherent flexibility but also improve their conductivity.

[0003] Currently, researchers mostly use electroless plating methods to metallize the surface of polymer fibers. For example, the literature (Surf.Coat.Technol., 2021, 405, 126706) uses a sensitization-activation two-step method to prepare autocatalytic electroless nickel-plated aramid fibers. However, the SnCl2 acidic solution used in the sensitization process will cause environmental pollution, and the Pd used in the activation process is expensive and not suitable for large-scale production. Another example is the patent (CN106637934A) which discloses a method for metallizing the surface of polyimide fibers. The polyimide fibers are cleaned, dried, roughened, activated, and reduced, and then electroless plating is used to deposit copper on the surface of the polyimide fibers to obtain copper-plated polyimide fibers. The fibers prepared by this method have good coating quality, are tightly bonded to the fiber matrix, and the process is simple. However, the strong oxidant potassium permanganate and the strong base sodium hydroxide used in the roughening process will damage the fibers and are also prone to causing environmental pollution. The patent (CN112813675B) discloses a metallized polyimide fiber and its preparation method. The process flow is degreasing and degumming - surface modification - surface conditioning - metallization - post-protection. The metallization process flow is pre-impregnation - activation - degumming - electroless plating, and this metallization process needs to be repeated three times. Although the metallized polyimide fibers prepared by this invention have advantages such as high strength and excellent electrical conductivity, their process is relatively complex and not suitable for large-scale production.

[0004] Compared with electroless plating, electroplating for metallizing the fiber surface has the advantages of lower cost, simple process, high plating speed, and less pollution. It can be continuously prepared while ensuring the quality of the coating. For example, Patent (CN114855233B) discloses a method, equipment, and large tow fiber for highly uniform metallization of large tow fibers. The large tow fibers (such as carbon fibers, metal fibers, and carbon nanotube fibers) are placed in an electroplating solution for continuous electrochemical deposition to coat a metal layer on the surface of the tows contained in the large tow fibers. The method provided by this patent ensures the uniformity of electroplating metallization of large tow fibers and improves the product quality. However, the electroplating method needs to be carried out on the surface of conductive fibers and is not applicable to non-conductive polymer fibers. Therefore, it is of profound significance and broad application prospects to provide a method for metallizing polymer fibers that is simple, reliable, safe, environmentally friendly, easy to operate, and can be mass-produced. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method for metallizing polymer fibers. First, taking the polymer fiber as the baseline, the carbon nanotube tube prepared by the floating chemical vapor deposition method is coated on the surface of the polymer fiber; then a modifier is used to modify the carbon nanotube-coated polymer fiber to obtain a transition layer that enhances the interfacial bonding; finally, the modified polymer fiber is electroplated by the electrochemical deposition method to obtain a metallized polymer fiber. The method proposed by the present invention is simple, reliable, safe, environmentally friendly, easy to operate, and can be industrially produced. Moreover, the composite fiber prepared has the advantages of light weight, high conductivity, and good processability.

[0006] The present invention is achieved through the following technical solutions:

[0007] The object of the present invention is to provide a method for metallizing polymer fibers, including the following steps:

[0008] (1) Taking the polymer fiber as the baseline, the carbon nanotube tube prepared by the floating chemical vapor deposition method is coated on the surface of the polymer fiber to obtain a carbon nanotube-coated polymer fiber;

[0009] (2) Using a modifier to modify the carbon nanotube-coated polymer fiber for a certain period of time, and then washing and drying with deionized water to obtain a modified polymer fiber;

[0010] (3) Using the electrochemical deposition method to electroplate the modified polymer fiber to obtain a polymer fiber with a dense and uniform metal layer coated on its surface.

[0011] In one embodiment of the present invention, in step (1), the polymer fiber is a natural fiber or a chemical fiber; the natural fiber is one or more of cotton fiber, hemp fiber, wool fiber and silk fiber; the chemical fiber is one or more of polyester, nylon, polypropylene, vinylon, acrylic fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, polyarylate fiber and polyamide fiber.

[0012] In one embodiment of the present invention, in step (1), the preparation of carbon nanotube tubes by the floating chemical vapor deposition method is as follows: a mixed solution of ethanol, ferrocene and thiophene is passed through a peristaltic pump and enters a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain carbon nanotube tubes.

[0013] In one embodiment of the present invention, in step (1), the specific process of coating is as follows: after the baseline is wetted with a solvent, it is contacted with the carbon nanotube tubes, thereby realizing the coating of carbon nanotubes on the surface of the baseline.

[0014] In one embodiment of the present invention, the solvent is selected from one or more of deionized water, ethanol and acetone.

[0015] In one embodiment of the present invention, in step (1), the number of coating layers is 1 to 5 layers.

[0016] In one embodiment of the present invention, in step (2), the modifier is selected from one or more of polydopamine, crosslinked chitosan and tannic acid.

[0017] In one embodiment of the present invention, the concentration of polydopamine is 2 g / L to 4 g / L, and the modification time is 4 h to 24 h;

[0018] and / or, the concentration of crosslinked chitosan is 6 g / L to 12 g / L, and the modification time is 1 h to 3 h;

[0019] and / or, the concentration of tannic acid is 1 g / L to 50 g / L, and the modification time is 1 h to 4 h.

[0020] In one embodiment of the present invention, in step (3), the electroplating solution for the electroplating treatment is one or more of a copper plating solution, a nickel plating solution and a silver plating solution;

[0021] The copper plating solution is composed of copper sulfate pentahydrate, sulfuric acid and deionized water;

[0022] The nickel plating solution is composed of nickel sulfate, nickel chloride, boric acid, sodium dodecyl sulfate, hydrochloric acid and deionized water;

[0023] The silver plating solution is composed of silver nitrate, sodium thiosulfate, potassium metabisulfite and deionized water.

[0024] In one embodiment of the present invention, in step (3), the voltage of the electroplating treatment is 4V to 12V, and the electroplating time is 30min to 70min.

[0025] In one embodiment of the present invention, in step (3), the metal is one or more of copper, nickel, and silver.

[0026] The above technical solution of the present invention has the following advantages compared with the prior art:

[0027] In the present invention, a polymer fiber is used as a baseline, and a carbon nanotube tube prepared by a floating chemical vapor deposition method is coated on the surface of the polymer fiber; then a modifier is used to modify the polymer fiber coated with carbon nanotubes to obtain a transition layer that enhances interfacial bonding; finally, an electroplating treatment is carried out on the modified polymer fiber by an electrochemical deposition method to obtain a metallized polymer fiber. The method proposed by the present invention is simple, reliable, safe, environmentally friendly, easy to operate, and can be industrially produced, and the prepared composite fiber has the advantages of light weight, high conductivity, and good processability.

[0028] The present invention prepares a metallized polymer fiber by an electrochemical deposition method, which can avoid the damage to the fiber and the harm to the environment and health caused by the roughening, sensitization, and activation processes of traditional electroless plating.

[0029] The present invention can obtain conductive polymer fibers with different diameters, resistances, and metal coatings by adjusting the type and specifications of the polymer fiber, the number of layers of the carbon nanotube coating, the type of modifier, the type of electroplated metal, the electroplating conditions, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments of the present invention in conjunction with the accompanying drawings, where

[0031] Figure 1 is a scanning electron microscope image of the metallized polymer fiber prepared in Example 1;

[0032] Figure 2 is a scanning electron microscope image of the metallized polymer fiber prepared in Example 2;

[0033] Figure 3 is a scanning electron microscope image of the metallized polymer fiber prepared in Example 3. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following further illustrates the present invention in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the examples given are not intended to limit the present invention.

[0035] Unless otherwise specified, the experimental methods used in the following examples are all conventional methods. The materials, reagents, etc. used can be obtained from commercial sources unless otherwise specified.

[0036] Example 1

[0037] This example provides a method for metallizing polymer fibers, including the following steps:

[0038] (1) Coating carbon nanotubes on the surface of polymer fibers:

[0039] Pass the mixed solution of ethanol, ferrocene and thiophene through a peristaltic pump and enter a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain carbon nanotube tubular products. Among them, the mass ratio of ethanol, ferrocene and thiophene is 99:0.4:0.6, and the reaction temperature is 1300 °C;

[0040] Taking 80S cotton fiber as the baseline, after wetting the baseline with deionized water, contact it with the carbon nanotube tubular product to achieve coating of carbon nanotubes on the surface of the baseline. Among them, the coating process is repeated 1 time, that is, the number of coating layers is 2 layers;

[0041] (2) Modifying the polymer fibers coated with carbon nanotubes:

[0042] Use a dopamine aqueous solution with a concentration of 2 g / L, adjust the pH value to 8.7, immerse the carbon nanotube-coated cotton fibers in the dopamine aqueous solution at room temperature for 24 h for modification, and then wash and dry with deionized water to obtain poly-dopamine-modified carbon nanotube-coated cotton fibers;

[0043] (3) Coating a metal layer on the surface of the modified polymer fibers:

[0044] Perform electroplating treatment on the surface of the modified carbon nanotube-coated cotton fibers by electrochemical deposition method. Among them, the electroplating solution is composed of 90 g of copper sulfate pentahydrate, 15 mL of sulfuric acid and 500 mL of deionized water, the electroplating voltage is 7 V, and the electroplating time is 50 min;

[0045] The scanning electron microscope image of the finally obtained copper-coated cotton fibers in this example is as Figure 1 shown, among which, the linear resistance of the copper-coated cotton fibers is 0.10 Ω / cm, and the conductivity is 4.02×10 6 S / m.

[0046] Example 2

[0047] This example provides a method for metallizing polymer fibers, including the following steps:

[0048] (1) Coating carbon nanotubes on the surface of polymer fibers:

[0049] A mixed solution of ethanol, ferrocene, and thiophene is passed through a peristaltic pump and enters a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain carbon nanotube tubes. Among them, the mass ratio of ethanol, ferrocene, and thiophene is 99:0.4:0.6, and the reaction temperature is 1300 °C;

[0050] Taking 220 dtex aramid fiber as the baseline, after wetting the baseline with alcohol, it is contacted with the carbon nanotube tubes, so as to realize the coating of carbon nanotubes on the surface of the baseline. Among them, the coating process is repeated 2 times, that is, the coating layer number is 3 layers;

[0051] (2) Modify the polymer fiber coated with carbon nanotubes:

[0052] Using a 2 g / L dopamine aqueous solution, adjusting the pH value to 8.7, immersing the cotton fiber coated with carbon nanotubes in the dopamine aqueous solution at room temperature for 24 h for modification, and then washing and drying with deionized water to obtain the aramid fiber coated with carbon nanotubes modified with polydopamine;

[0053] (3) Coat a metal layer on the surface of the modified polymer fiber:

[0054] The surface of the modified aramid fiber coated with carbon nanotubes is electroplated by electrochemically depositing method. Among them, the electroplating solution is composed of 90 g of copper sulfate pentahydrate, 15 mL of sulfuric acid, and 500 mL of deionized water. The electroplating voltage is 7 V, and the electroplating time is 50 min;

[0055] The scanning electron microscope image of the finally obtained copper-plated aramid fiber in this example is as Figure 2 shown. Among them, the wire resistance of the copper-plated aramid fiber is 0.12 Ω / cm, and the conductivity is 2.17×10 6 S / m.

[0056] Example 3

[0057] This example provides a method for metallizing polymer fibers, including the following steps:

[0058] (1) Coat carbon nanotubes on the surface of the polymer fiber:

[0059] A mixed solution of ethanol, ferrocene, and thiophene is passed through a peristaltic pump and enters a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain carbon nanotube tubes. Among them, the mass ratio of ethanol, ferrocene, and thiophene is 99:0.4:0.6, and the reaction temperature is 1300 °C;

[0060] Taking 25D ultra-high molecular weight polyethylene fiber as the baseline, after wetting the baseline with acetone, it is contacted with the carbon nanotube tubes, so as to realize the coating of carbon nanotubes on the surface of the baseline. Among them, the coating process is repeated 1 time, that is, the coating layer number is 2 layers;

[0061] (2) Modify the polymer fiber coated with carbon nanotubes:

[0062] Use a dopamine aqueous solution with a concentration of 2 g / L, adjust the pH value to 8.7, immerse the carbon nanotube-coated cotton fiber in the dopamine aqueous solution at room temperature for 24 h for modification, and then wash and dry it with deionized water to obtain the ultra-high molecular weight polyethylene fiber coated with carbon nanotubes modified with polydopamine;

[0063] (3) Coat a metal layer on the surface of the modified polymer fiber:

[0064] Perform electroplating treatment on the surface of the modified ultra-high molecular weight polyethylene fiber coated with carbon nanotubes by the electrochemistry deposition method. Among them, the electroplating solution is composed of 90 g of copper sulfate pentahydrate, 15 mL of sulfuric acid, and 500 mL of deionized water. The electroplating voltage is 8 V, and the electroplating time is 50 min;

[0065] The scanning electron microscope image of the finally obtained copper-plated ultra-high molecular weight polyethylene fiber in this example is as Figure 3 shown. Among them, the linear resistance of the copper-plated ultra-high molecular weight polyethylene fiber is 0.12 Ω / cm, and the conductivity is 6.29×10 6 S / m.

[0066] Example 4

[0067] This example provides a method for metallizing polymer fibers, including the following steps:

[0068] (1) Coat carbon nanotubes on the surface of the polymer fiber:

[0069] Pass the mixed solution of ethanol, ferrocene, and thiophene through a peristaltic pump and enter a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain a carbon nanotube tube. Among them, the mass ratio of ethanol, ferrocene, and thiophene is 99:0.4:0.6, and the reaction temperature is 1300 °C;

[0070] Taking 25D polyarylate fiber as the baseline, after wetting the baseline with alcohol, contact it with the carbon nanotube tube to achieve coating carbon nanotubes on the surface of the baseline. Among them, the coating process is repeated 2 times, that is, the coating layer number is 3 layers;

[0071] (2) Modify the polymer fiber coated with carbon nanotubes:

[0072] Use a dopamine aqueous solution with a concentration of 2 g / L, adjust the pH value to 8.7, immerse the carbon nanotube-coated cotton fiber in the dopamine aqueous solution at room temperature for 24 h for modification, and then wash and dry it with deionized water to obtain the polyarylate fiber coated with carbon nanotubes modified with polydopamine;

[0073] (3) Coating a metal layer on the surface of the modified polymer fiber:

[0074] Electroplating treatment was carried out on the surface of the polyarylate fiber coated with modified carbon nanotubes by the electrochemical deposition method. Among them, the electroplating solution consisted of 60 g of nickel sulfate, 35 g of nickel chloride, 15 g of boric acid, 0.05 g of sodium dodecyl sulfate and 500 mL of deionized water. The electroplating voltage was 6 V and the electroplating time was 50 min;

[0075] The wire resistance of the finally obtained nickel-plated polyarylate fiber in this example was 0.34 Ω / cm, and the conductivity was 2.7×10 6 S / m.

[0076] Example 5

[0077] This example provides a method for metallizing polymer fibers, including the following steps:

[0078] (1) Coating carbon nanotubes on the surface of the polymer fiber:

[0079] The mixed solution of ethanol, ferrocene and thiophene was passed through a peristaltic pump and reacted in a high-temperature furnace under the carrier of high-purity nitrogen to obtain carbon nanotube tubes. Among them, the mass ratio of ethanol, ferrocene and thiophene was 99:0.4:0.6, and the reaction temperature was 1300 °C;

[0080] Taking 25D ultra-high molecular weight polyethylene fiber as the baseline, after wetting the baseline with alcohol, it was contacted with the carbon nanotube tubes to achieve coating of carbon nanotubes on the surface of the baseline. Among them, the coating process was repeated 2 times, that is, the coating layer was 3 layers;

[0081] (2) Modifying the polymer fiber coated with carbon nanotubes:

[0082] Using a 2 g / L dopamine aqueous solution, adjusting the pH value to 8.7, immersing the carbon nanotube-coated cotton fiber in the dopamine aqueous solution at room temperature for 24 h for modification, and then washing and drying with deionized water to obtain the poly-dopamine-modified carbon nanotube-coated ultra-high molecular weight polyethylene fiber;

[0083] (3) Coating a metal layer on the surface of the modified polymer fiber:

[0084] Electroplating treatment was carried out on the surface of the modified carbon nanotube-coated ultra-high molecular weight polyethylene fiber by the electrochemical deposition method. Among them, the electroplating solution consisted of 60 g of nickel sulfate, 35 g of nickel chloride, 15 g of boric acid, 0.05 g of sodium dodecyl sulfate and 500 mL of deionized water. The electroplating voltage was 5 V and the electroplating time was 70 min;

[0085] The linear resistance of the nickel-plated ultra-high molecular weight fiber finally obtained in this example is 0.28 Ω / cm, and the conductivity is 2.5×10 6 S / m.

[0086] Example 6

[0087] This example provides a method for metallizing polymer fibers, including the following steps:

[0088] (1) Coating carbon nanotubes on the surface of polymer fibers:

[0089] Pass the mixed solution of ethanol, ferrocene and thiophene through a peristaltic pump and enter a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain carbon nanotube tubes. Among them, the mass ratio of ethanol, ferrocene and thiophene is 99:0.4:0.6, and the reaction temperature is 1300 °C;

[0090] Taking 32S white blank cotton fiber as the baseline, after wetting the baseline with deionized water, making it contact with the carbon nanotube tubes, realizing the coating of carbon nanotubes on the surface of the baseline. Among them, the coating process is repeated 1 time, that is, the number of coating layers is 2 layers;

[0091] (2) Modifying the polymer fibers coated with carbon nanotubes:

[0092] Use a 2 g / L dopamine aqueous solution, adjust the pH value to 8.7, immerse the carbon nanotube-coated cotton fiber in the dopamine aqueous solution at room temperature for 24 h of modification, and then wash and dry with deionized water to obtain the poly-dopamine-modified carbon nanotube-coated white blank cotton fiber;

[0093] (3) Coating a metal layer on the surface of the modified polymer fibers:

[0094] Use the electrochemically deposited method to electroplate the surface of the modified carbon nanotube-coated white blank cotton fiber. Among them, the electroplating solution is composed of 20 g of silver nitrate, 120 g of sodium thiosulfate, 20 g of potassium metabisulfite, and 500 mL of deionized water. The electroplating voltage is 7 V, and the electroplating time is 50 min;

[0095] The linear resistance of the silver-plated white blank cotton fiber finally obtained in this example is 0.30 Ω / cm, and the conductivity is 1.35×10 6 S / m.

[0096] Comparative Example 1

[0097] This comparative example provides a method for coating carbon nanotubes on the surface of polymer fibers, which is similar to the method of Example 1, and the difference is only that: it only includes the steps of step (1) to obtain polymer fibers with carbon nanotubes coated on the surface. It is detected that the conductivity is 1.75×10 4 S / m.

[0098] Comparative Example 2

[0099] This comparative example provides a method for preparing copper sulfide / carbon nanotube fibers, and the specific steps are as follows:

[0100] (1) Prepare carbon nanotube fibers:

[0101] A mixed solution of ethanol, ferrocene, and thiophene is passed through a peristaltic pump and enters a high-temperature furnace under the carrier of high-purity nitrogen for reaction to obtain carbon nanotube tubes. Among them, the mass ratio of ethanol, ferrocene, and thiophene is 99:0.4:0.6, and the reaction temperature is 1300 °C;

[0102] The carbon nanotube tubes are shrunk by a water bath to obtain primary fibers. Subsequently, 2 primary fibers are combined and twisted at a twist of 2500 Tm -1 to obtain carbon nanotube fibers;

[0103] (2) Modify the carbon nanotube fibers:

[0104] Use a dopamine aqueous solution of 2 g / L, adjust the pH value to 8.7, immerse the carbon nanotube fibers in the dopamine aqueous solution at room temperature for 24 h of modification, and then wash and dry with deionized water to obtain poly-dopamine-modified carbon nanotube fibers;

[0105] (3) Coat a metal layer on the surface of the modified carbon nanotube fibers:

[0106] The surface of the modified carbon nanotube fibers is electroplated by an electrochemical deposition method. Among them, the electroplating solution is composed of 90 g of copper sulfate pentahydrate, 15 mL of sulfuric acid, and 500 mL of deionized water. The electroplating voltage is 7 V, and the electroplating time is 50 min;

[0107] (4) Sulfurization treatment:

[0108] The carbon nanotube fibers coated with metal are immersed in an ammonium sulfide solution with a concentration of 1.5 M at room temperature for 4 min of sulfurization treatment to obtain copper sulfide / carbon nanotube fibers.

[0109] The finally prepared copper sulfide / carbon nanotube fibers are composed of carbon nanotube fibers and a poly-dopamine layer, a copper layer, and a copper sulfide layer that are sequentially coated on the surface of the carbon nanotube fibers from the inside out. After testing, its conductivity is 3.17×10 5 S / m.

[0110] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A method for metallizing a polymer fiber, characterized in that, It includes the following steps: (1) Using the polymer fiber as the baseline, coating the carbon nanotube tube prepared by the floating chemical vapor deposition method on the surface of the polymer fiber to obtain the polymer fiber coated with carbon nanotubes; (2) Modifying the polymer fiber coated with carbon nanotubes with a modifier, then washing and drying with deionized water to obtain the modified polymer fiber; (3) Performing electroplating treatment on the modified polymer fiber by the electrochemically deposition method to obtain the polymer fiber with a dense and uniform metal layer coated on the surface.

2. The method according to claim 1, wherein In step (1), the polymer fiber is a natural fiber or a chemical fiber; the natural fiber is one or more of cotton fiber, hemp fiber, wool fiber, and silk fiber; the chemical fiber is one or more of polyester, nylon, polypropylene, vinylon, acrylic fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, polyarylate fiber, and polyamide fiber.

3. The method according to claim 1, characterized in that, In step (1), the method for preparing the carbon nanotube tube by the floating chemical vapor deposition method is as follows: passing the mixed solution of ethanol, ferrocene, and thiophene through a peristaltic pump and entering a high-temperature furnace for reaction under the carrier of high-purity nitrogen to obtain the carbon nanotube tube.

4. The method according to claim 1, wherein In step (1), the coating step is as follows: wetting the polymer fiber with a solvent, then contacting it with the carbon nanotube tube to achieve coating of carbon nanotubes on the surface of the baseline; the solvent is selected from one or more of deionized water, ethanol, and acetone.

5. The method according to claim 1, characterized in that In step (1), the number of coating layers is 1 to 5 layers.

6. The method according to claim 1, wherein In step (2), the modifier is selected from one or more of polydopamine, crosslinked chitosan, and tannic acid.

7. The method according to claim 6, wherein The concentration of the polydopamine is 2 g / L to 4 g / L, and the modification time is 4 h to 24 h; and / or, the concentration of the crosslinked chitosan is 6 g / L to 12 g / L, and the modification time is 1 h to 3 h; and / or, the concentration of the tannic acid is 1 g / L to 50 g / L, and the modification time is 1 h to 4 h.

8. The method according to claim 1, characterized in that In step (3), the electroplating solution for the electroplating treatment is one or more of copper plating solution, nickel plating solution, and silver plating solution.

9. The method according to claim 1, wherein In step (3), the voltage for the electroplating treatment is 4 V to 12 V, and the electroplating time is 30 min to 70 min.

10. The method according to claim 1, characterized in that In step (3), the metal is one or more of copper, nickel, and silver.

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