Plating liquid for improving compatibility of metal and environment-friendly substitute gas in gas insulation equipment and preparation method of plating liquid

Abstract

The invention provides a plating solution for improving compatibility of metal and environment-friendly substitute gas in gas insulation equipment and a preparation method of the plating solution, according to the plating solution, one-dimensional and two-dimensional materials are introduced and form a silver plating solution with zero-dimensional silver nanoparticles, and a multi-dimensional framework is jointly formed. And under the condition of different silver concentrations, the plating solution can have excellent dispersity, and no obvious layering or agglomeration phenomenon exists. According to the novel plating solution disclosed by the invention, one-dimensional and two-dimensional materials are introduced into the silver plating solution, so that the formed silver paste has excellent dispersity, and the silver paste can be stored for a long time and is low in cost on the premise of simple process. And silver plating solutions with different concentrations and viscosities can be obtained by controlling the adding amount of the ethylene glycol solvent. When the silver plating solution is plated on copper, the problem that the compatibility of copper metal in fluorocarbon environment-friendly insulating gas is poor can be solved, and the problems that when only silver paste is used for plating, the cost is high, the dispersity is poor, the viscosity is fixed, the concentration is fixed, and the adhesive force is poor can also be solved.

Description

Technical Field

[0001] The invention relates to the technical field of nano materials and metal plating, in particular to a plating liquid for improving the compatibility of metal in gas insulation equipment with an environmentally friendly alternative gas and a preparation method thereof. Background Art

[0002] SF6 is a widely recognized greenhouse gas that is extremely harmful to the environment. Its greenhouse effect is 23,500 times that of CO2 and it can remain in the atmosphere for more than 3,200 years. In order to combat the threat of global warming, it is necessary not only to reduce CO2 emissions, but also to reduce SF6 emissions, which has a significant greenhouse effect. This makes finding environmentally friendly insulating media in electrical equipment a research focus and challenge for the power industry.

[0003] However, the new environmentally friendly gas is not only required to have excellent insulation properties, but also to have good compatibility with the solid materials inside the equipment. If the materials inside the equipment are not compatible with the new environmentally friendly gas, it may cause chemical reactions between the gas components and the materials, changing the material properties. This poses a danger to the normal operation of the gas-insulated equipment and hinders the long-term safe operation of the equipment. Environmentally friendly insulating media that are currently considered to have alternative potential include perfluoroisobutyronitrile (C4F7N), perfluoropentanone (C5F 10 O), perfluorohexanone (C6F 12 O) and other fluorocarbons will decompose with the key metal material copper in the equipment chamber under the action of electric heat, causing the decomposition of the insulating medium and corrosion of the copper metal surface. At the same time, these environmentally friendly insulating media show good compatibility with metallic silver, so silver plating on key structures in the equipment chamber is an effective way to prevent copper material corrosion.

[0004] Common methods of plating metal surfaces include electroplating, chemical plating, hot-dip plating, spraying, and sputtering. Covering the copper metal surface with a layer of silver paste is a common treatment method, but silver paste has the disadvantages of high cost (high proportion of heavy metals), poor dispersibility (particles in the silver paste are easy to aggregate and precipitate), and difficult to preserve (easy to stratify during long-term storage). Summary of the invention

[0005] In view of the existing silver plating solution in the prior art that can be used to solve the problem of poor compatibility of copper metal in carbon-fluorine-based environmentally friendly insulating medium atmospheres, which has the problems of high cost, poor dispersibility, fixed viscosity and concentration, poor adhesion, etc., a plating solution for improving the compatibility of metals in gas-insulated equipment with environmentally friendly alternative gases and a preparation method thereof are provided. By designing a silver plating solution with a new ratio, it can be firmly combined with the metal material by plating on the surface of copper metal, has significant adhesion and microhardness, and at the same time has excellent chemical stability and corrosion resistance.

[0006] A plating solution for improving the compatibility of metal in gas-insulated equipment with an environmentally friendly alternative gas and a preparation method thereof, comprising the following steps:

[0007] Step 1), mixing silver metal powder, carbon nanotube powder and graphene oxide powder in a certain proportion;

[0008] Step 2), adding isopropanol to the product obtained in step 1) and transferring it to a ball mill for ball milling;

[0009] Step 3), placing the product obtained in step 2) in an oven for a certain period of time for high temperature drying;

[0010] Step 4), putting the product obtained in step 3) into a mortar and grinding it until there is no obvious granular feeling;

[0011] Step 5), putting the mixture obtained in step 4) into a ground-mouth bottle and adding a magnet, adding a binder and a certain amount of ethylene glycol solution, placing it on a magnetic stirrer for stirring, mixing and stirring for a certain period of time, and then performing ultrasonication to obtain the prepared silver plating solution.

[0012] Furthermore, in step 1), the amount of the nano silver metal particles is 30-60 mg, the amount of the carbon nanotube powder is 35-45 mg, the amount of the graphene oxide powder is 5-15 mg, and the amount of isopropanol in step 2) is 392.75-785.5 mg.

[0013] Furthermore, in step 2), the rotation speed of the ball mill is 300-450 r / min, and the grinding time is 5-8 h.

[0014] Furthermore, in step 3), the temperature of the oven is 80° C. and the drying time is 8-10 hours.

[0015] Furthermore, the grinding time in step 4) is 10-15 min.

[0016] Furthermore, in step 5), the binder is a CMC solution or a PVDF solution.

[0017] Furthermore, in step 5), CMC solution is used as a binder with a concentration of 20-25 mg / mL, an amount of 0.5 mL, and an amount of ethylene glycol of 556.5-1669.5 mg.

[0018] Furthermore, in step 5), the rotation speed of the magnetic stirrer is 600 r / min, the stirring time is 8-10 h, an ultrasonic cleaner is used for ultrasonication, the power of the ultrasonic cleaner is set to 80%, and the ultrasonication time is 0.5-1 h.

[0019] A plating solution prepared according to the above preparation method.

[0020] A plating solution prepared according to the preparation method is used as a silver plating solution to be plated on a copper surface to protect copper metal materials from corrosion by carbon-fluorine-based environmentally friendly insulating gases.

[0021] The present invention can adjust the components of the plating solution and the ratio of different components to produce a silver plating solution with good dispersibility and different silver concentrations and viscosities, thereby improving the problem of poor compatibility of copper metal with carbon-fluorine-based environmentally friendly insulating gases in gas-insulated equipment. The method designs a novel plating solution ratio, which has excellent dispersibility. The plating solution obtained by using one-dimensional carbon nanotubes and two-dimensional graphene oxide powder to perform multi-dimensional material mixing has good dispersibility, and will not have stratification, agglomeration and the like during long-term storage; the method has relatively low cost, and reduces the amount of heavy metal silver powder by using metal silver powder mixed with carbon nanotubes and graphene oxide powder; the viscosity is adjustable, and the viscosity of the plating solution can be accurately regulated by controlling different addition amounts of ethylene glycol, and plating solutions with different viscosities can be prepared according to different use requirements; the method has good adhesion after plating, can be firmly combined with metal materials, and has significant adhesion and microhardness; the method has excellent chemical stability and corrosion resistance, and can protect copper metal from corrosion in a carbon-fluorine-based environmentally friendly insulating gas atmosphere; the method has strong conductivity. In electrical equipment, copper is used as a metal conductor, and the material plated thereon also needs to have good conductivity. The novel ratio of the present invention adds highly conductive one-dimensional carbon nanotubes and two-dimensional conductive graphene oxide powder to form a multi-dimensional conductive network, so that the plating solution has good conductivity.

[0022] The beneficial effects of the present invention are as follows: based on the plating process and the nanocomposite material process, zero-dimensional silver metal particles are mixed with one-dimensional carbon nanotubes, two-dimensional graphene oxide powder, binder CMC solution (or PVDF solution), and solvent ethylene glycol by ultrasonic stirring to produce a silver plating solution with the characteristics of low cost, good dispersibility, easy preservation, good adhesion after plating, high conductivity, strong corrosion resistance, etc. When the plating solution prepared by the present invention is plated on the copper metal surface in medium and low voltage gas insulation equipment, the copper can be protected from corrosion in a carbon-fluorine environmentally friendly insulating gas environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 These are the effects of three embodiments of the present invention being plated on copper;

[0024] Figure 2 This is a graph showing the change of the low-content silver plating solution (silver nanoparticle content 30%-40%) over time (10 min, 1 h, 5 h) in Example 1 of the present invention;

[0025] Figure 3 This is a graph showing the change of the silver content of the plating solution (silver nanoparticle content 40%-50%) over time (10 min, 1 h, 5 h) in Example 2 of the present invention;

[0026] Figure 4 This is a graph showing the change of the high-content silver plating solution (silver nanoparticle content 60%-90%) over time (10 min, 1 h, 5 h) of Example 3 of the present invention;

[0027] Figure 5 This is the result of long-term standing (24h×7) of a low-content silver plating solution (silver nanoparticle content 30%-40%) in Example 1 of the present invention;

[0028] Figure 6 The results are as follows: the silver plating solution (silver nanoparticle content 40%-50%) in Example 2 of the present invention was left to stand for a long time (24h×7);

[0029] Figure 7 This is the result of long-term standing (24h×7) of the high-content silver plating solution (silver nanoparticle content 60%-90%) of Example 3 of the present invention.

[0030] Figure 8 The present invention is a flow chart of a method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0032] like Figure 8 As shown, the present invention provides a method for preparing a plating solution for improving the compatibility of metal and environmentally friendly alternative gas in gas-insulated equipment, comprising the following steps:

[0033] Step 1), mixing silver metal powder, carbon nanotube powder and graphene oxide powder in a certain proportion;

[0034] Step 2), adding isopropanol to the product obtained in step 1) and transferring it to a ball mill for ball milling;

[0035] Step 3), placing the product obtained in step 2) in an oven for a certain period of time for high temperature drying;

[0036] Step 4), putting the product obtained in step 3) into a mortar and grinding it until there is no obvious granular feeling;

[0037] Step 5), putting the mixture obtained in step 4) into a ground-mouth bottle and adding a magnet, adding a binder and a certain amount of ethylene glycol solution, placing it on a magnetic stirrer for stirring, mixing and stirring for a certain period of time, and then performing ultrasonication to obtain the prepared silver plating solution.

[0038] The conclusions obtained from the experiment show that by introducing one-dimensional carbon nanotubes and two-dimensional graphene oxide powder into the plating solution, together with zero-dimensional silver nanopowder to form a three-dimensional framework network, the plating solution has good dispersibility, is easy to store, and has good adhesion. And in plating solutions with different silver contents and viscosities, the characteristics of low cost, good dispersibility, adjustable viscosity, good adhesion after plating, high conductivity, and strong corrosion resistance can be achieved. Therefore, the main difference between different implementation methods is to control the content of silver nanoparticles, that is, step 1), and they are numbered as low-content silver plating solution, medium-content silver plating solution, and high-content silver plating solution according to the different amounts of added silver nanoparticles:

[0039] Table 1 Comparison of silver nanoparticle content corresponding to different examples

[0040]

[0041] exist Figure 1 In the figure, we can observe the effects of low, medium and high silver nanoparticle contents plated on copper. As the silver nanoparticle content in the slurry increases, the color of the copper surface becomes darker after drying.

[0042] Example 1 Low-content silver plating solution (silver nanoparticle content 30%-40%):

[0043] A method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment comprises the following steps:

[0044] 1) Mix 30-40 mg of silver metal powder, 35-45 mg of carbon nanotube powder and 5-15 mg of graphene oxide powder.

[0045] 2) Add 392.75-785.5 mg of isopropanol to the product obtained in step 1) and transfer the mixture to a ball mill for ball milling.

[0046] 3) The product obtained in step 2) is placed in an oven at 80° C. for 8-10 hours for high temperature drying.

[0047] 4) The product obtained in step 3) is placed in a mortar and ground for 10-15 minutes until no obvious particles are felt.

[0048] 5) The mixture obtained in step 4) is placed in a ground-mouth bottle and a magnetic bar is added, and 0.5 mL of 20-25 mg / mL CMC solution and 1669.5 mg of ethylene glycol solution are added. The mixture is stirred at 600 r / min for 8 h on a magnetic stirrer and then ultrasonicated for 0.5-1 h in an 80% power ultrasonic cleaner to obtain the prepared silver plating solution.

[0049] Taking the product prepared in this embodiment as an example, when the content of silver nanoparticles added in the three-dimensional framework network accounts for 30%-40%, it has a lower viscosity, and the viscosity can be determined by the degree of decrease of the liquid over time. Figure 2 The graph of the drop of the solution of low-content silver plating solution (silver nanoparticle content 30%-40%) over time (10min, 1h, 5h) shows that after the slurry is put into the test tube and inverted, about 2 / 3 has flowed to the bottom after standing for 10min, about 4 / 5 has flowed to the bottom after standing for 1h, and after standing for 5h, except for the trace droplets adhering to the wall of the test tube, the rest has completely flowed to the bottom, indicating that its viscosity is relatively low. And if Figure 5 It shows that after the low-content silver plating solution has been left standing for a long time (24h×7), the slurry has all flowed to the bottom of the test tube. It can be observed that the low viscosity of the low silver nanoparticle content leads to a larger total slurry amount than the medium and high-content silver plating solution under the same conditions of controlling the content of other slurry components. By comparing the plating solutions with different silver nanoparticle contents, it can be found that the rate of decrease of the low-content silver plating solution over time is significantly higher than that of the medium-content silver plating solution and the high-content silver plating solution. And it can be found from the image that the solution can maintain good dispersibility during this time (10min, 1h, 5h), without obvious stratification or agglomeration.

[0050] The low-content silver plating solution prepared in this embodiment is plated on copper. The preparation method of the plating solution is as follows: silver metal powder is used as the main material, carbon nanotubes and graphene oxide powders are used as conductive agents, CMC solution is used as a binder, and ethylene glycol is used as a solvent. The mass ratio of the main material (zero-dimensional silver metal powder), the conductive agent (one-dimensional carbon nanotubes + two-dimensional graphene oxide powder), the binder (CMC) and the solvent (ethylene glycol) is 3:6:1:0.5; after they are fully mixed according to the proportion, they are stirred and ultrasonicated to obtain the silver plating solution.

[0051] Taking the silver plating solution with different contents prepared in this embodiment as an example, it has a lower concentration and a fast falling speed over time. It also has relatively excellent plating adhesion, and the morphology is well maintained after drying without material warping. It has good dispersibility and no obvious stratification or agglomeration phenomenon when placed for a long time. After being plated on the surface of copper foil, it can also wrap the copper foil well, thereby improving its corrosion resistance.

[0052] The above shows that by introducing one-dimensional carbon nanotubes and two-dimensional graphene oxide powder into the plating solution, together with zero-dimensional silver nanopowder to form a three-dimensional framework network, the plating solution has good dispersibility, easy preservation, and good adhesion. In addition, in plating solutions with different silver content concentrations and viscosities, the characteristics of low cost, good dispersibility, long-term preservation without stratification, adjustable viscosity, strong adhesion after plating, good conductivity, and strong corrosion resistance can be achieved, improving the shortcomings of ordinary silver paste and being able to better improve the corrosion resistance of copper in carbon-fluorine environmentally friendly insulating gas environments.

[0053] Silver plating solution in Example 2 (silver nanoparticle content 40%-50%):

[0054] A method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment comprises the following steps:

[0055] 1) Mix 40-50 mg of silver metal powder, 35-45 mg of carbon nanotube powder and 5-15 mg of graphene oxide powder.

[0056] 2) Add 392.75-785.5 mg of isopropanol to the product obtained in step 1) and transfer the mixture to a ball mill for ball milling.

[0057] 3) The product obtained in step 2) is placed in an oven at 80° C. for 8-10 hours for high temperature drying.

[0058] 4) The product obtained in step 3) is placed in a mortar and ground for 10-15 minutes until no obvious particles are felt.

[0059] 5) The mixture obtained in step 4) is placed in a ground-mouth bottle and a magnetic bar is added, and 0.5 mL of 20-25 mg / mL CMC solution and 1113 mg of ethylene glycol solution are added. The mixture is stirred at 600 r / min for 8 h on a magnetic stirrer and then ultrasonicated for 0.5-1 h in an 80% power ultrasonic cleaner to obtain the prepared silver plating solution.

[0060] Taking the product prepared in this embodiment as an example, when the silver nanoparticles account for 40%-50% of the three-dimensional framework network, it has a medium viscosity, which can be determined by the degree of decrease of the liquid over time. Figure 3 The graph of the drop of the medium-content silver plating solution (silver nanoparticle content 40%-50%) over time (10min, 1h, 5h) shows that after the slurry is put into the test tube and inverted, about 1 / 4 has flowed to the bottom after standing for 10min, about 3 / 4 has flowed to the bottom after standing for 1h, and about 4 / 5 has flowed to the bottom after standing for 5h. Some slurry still adheres to the top of the test tube, indicating that its viscosity is medium. And if Figure 6It shows that after the medium-content silver plating solution has been left to stand for a long time (24h×7), the slurry has completely flowed to the bottom except for the trace droplets adhering to the wall of the test tube. It can be observed that the medium viscosity of the silver nanoparticle content leads to a relatively low total slurry amount under the same conditions of controlling the contents of other slurry components, and the high-content silver plating solution is at a medium level. By comparing the plating solutions with different silver nanoparticle contents, it can be found that the medium-content silver plating solution decreases significantly faster than the high-content silver plating solution over time, but lower than the low-content silver plating solution. And it can be found from the image that the solution can maintain good dispersibility during this time (10min, 1h, 5h), without obvious stratification or agglomeration.

[0061] The medium-content silver plating solution prepared in this embodiment is plated on copper. The preparation method of the plating solution is as follows: silver metal powder is used as the main material, carbon nanotubes and graphene oxide powders are used as conductive agents, CMC solution is used as a binder, and ethylene glycol is used as a solvent. The mass ratio of the main material (zero-dimensional silver metal powder), the conductive agent (one-dimensional carbon nanotubes + two-dimensional graphene oxide powder), the binder (CMC) and the solvent (ethylene glycol) is 5:4:1:0.5; after they are fully mixed according to the proportion, they are stirred and ultrasonicated to obtain the silver plating solution.

[0062] Taking the silver plating solution with different contents prepared in this embodiment as an example, it has a medium concentration and a fast falling speed over time. It also has relatively excellent plating adhesion, and the morphology is well maintained after drying without material warping. It has good dispersibility and no obvious stratification or agglomeration phenomenon when placed for a long time. After being plated on the surface of copper foil, it can also wrap the copper foil well, thereby improving its corrosion resistance.

[0063] The above shows that by introducing one-dimensional carbon nanotubes and two-dimensional graphene oxide powder into the plating solution, together with zero-dimensional silver nanopowder to form a three-dimensional framework network, the plating solution has good dispersibility, easy preservation, and good adhesion. In addition, in plating solutions with different silver content concentrations and viscosities, the characteristics of low cost, good dispersibility, long-term preservation without stratification, adjustable viscosity, strong adhesion after plating, good conductivity, and strong corrosion resistance can be achieved, improving the shortcomings of ordinary silver paste and being able to better improve the corrosion resistance of copper in carbon-fluorine environmentally friendly insulating gas environments.

[0064] Example 3 High-content silver plating solution (silver nanoparticle content 60%-90%):

[0065] A method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment comprises the following steps:

[0066] 1) Mix 60-90 mg of silver metal powder, 35-45 mg of carbon nanotube powder and 5-15 mg of graphene oxide powder.

[0067] 2) Add 392.75-785.5 mg of isopropanol to the product obtained in step 1) and transfer the mixture to a ball mill for ball milling.

[0068] 3) The product obtained in step 2) is placed in an oven at 80° C. for 8-10 hours for high temperature drying.

[0069] 4) The product obtained in step 3) is placed in a mortar and ground for 10-15 minutes until no obvious particles are felt.

[0070] 5) The mixture obtained in step 4) is placed in a ground-mouth bottle and a magnetic bar is added, and 0.5 mL of 20-25 mg / mL CMC solution and 556.5 mg of ethylene glycol solution are added. The mixture is stirred at 600 r / min for 8 h on a magnetic stirrer and then ultrasonicated for 0.5-1 h in an 80% power ultrasonic cleaner to obtain the prepared silver plating solution.

[0071] Taking the product prepared in this embodiment as an example, when the silver nanoparticles account for 60%-90% of the three-dimensional framework network, it has a higher viscosity, which can be determined by the degree of decrease of the liquid over time. Figure 4 The graph of the drop of high-content silver plating solution (silver nanoparticle content 60%-90%) over time (10min, 1h, 5h) shows that after the slurry is put into the test tube and turned upside down, it is still all concentrated on the top of the test tube after standing for 10min. After standing for 1h, only a trace amount of slurry, about 1 / 10, has flowed to the bottom. After standing for 5h, about 1 / 2 has flowed to the bottom, and a large amount of slurry is still attached to the top of the test tube, indicating that its viscosity is relatively high. And if Figure 7 It shows that after the medium-content silver plating solution has been left to stand for a long time (24h×7), the slurry has completely flowed to the bottom except for the trace droplets adhering to the wall of the test tube. It can be observed that the high viscosity of the high silver nanoparticle content leads to a lower total slurry amount and less medium-content silver plating solution under the same conditions of controlling the content of other slurry components. By comparing the plating solutions with different silver nanoparticle contents, it can be found that the high-content silver plating solution has a significantly lower rate of decrease over time than the low-content silver plating solution and the medium-content silver plating solution. And it can be found from the image that the solution can maintain good dispersibility during this time (10min, 1h, 5h), without obvious stratification or agglomeration.

[0072] The high-content silver plating solution prepared in this embodiment is plated on copper. The preparation method of the plating solution is as follows: silver metal powder is used as the main material, carbon nanotubes and graphene oxide powders are used as conductive agents, CMC solution is used as a binder, and ethylene glycol is used as a solvent. The mass ratio of the main material (zero-dimensional silver metal powder), the conductive agent (one-dimensional carbon nanotubes + two-dimensional graphene oxide powder), the binder (CMC) and the solvent (ethylene glycol) is 8:1:1:0.5; after they are fully mixed in proportion, they are stirred and ultrasonically obtained to obtain the silver plating solution. Taking the silver plating solution of different contents prepared in this embodiment as an example of plating on the silver surface, it has a high concentration and a fast falling speed over time. At the same time, it has relatively excellent plating adhesion, and the morphology remains good after drying and no material warping and other phenomena occur. It has good dispersibility, and there is no obvious stratification or agglomeration phenomenon when it is placed for a long time. After plating on the surface of copper foil, it can also wrap the copper foil well, so that its corrosion resistance can be improved.

[0073] The above shows that by introducing one-dimensional carbon nanotubes and two-dimensional graphene oxide powder into the plating solution, together with zero-dimensional silver nanopowder to form a three-dimensional framework network, the plating solution has good dispersibility, easy preservation and good adhesion; and in the plating solution with different silver content concentration and viscosity, the characteristics of low cost, good dispersibility, long-term preservation without stratification, adjustable viscosity, strong adhesion after plating, good conductivity, strong corrosion resistance, etc. can be achieved, the shortcomings of ordinary silver paste are improved, and the corrosion resistance of copper in carbon-fluorine environmentally friendly insulating gas environment can be better improved.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment, comprising the following steps: Step 1), mixing silver metal powder, carbon nanotube powder and graphene oxide powder in a certain proportion; Step 2), adding isopropanol to the product obtained in step 1) and transferring it to a ball mill for ball milling; Step 3), placing the product obtained in step 2) in an oven for a certain period of time for high temperature drying; Step 4), putting the product obtained in step 3) into a mortar and grinding it until there is no obvious granular feeling; Step 5), putting the mixture obtained in step 4) into a ground-mouth bottle and adding a magnet, adding a binder and a certain amount of ethylene glycol solution, placing it on a magnetic stirrer for stirring, mixing and stirring for a certain period of time, and then performing ultrasonication to obtain the prepared silver plating solution.

2. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: In step 1), the amount of the nano silver metal particles is 30-60 mg, the amount of the carbon nanotube powder is 35-45 mg, the amount of the graphene oxide powder is 5-15 mg, and the amount of isopropanol in step 2) is 392.75-785.5 mg.

3. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: In step 2), the rotation speed of the ball mill is 300-450 r / min, and the grinding time is 5-8 h.

4. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: In step 3), the temperature of the oven is 80° C. and the drying time is 8-10 hours.

5. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: The grinding time in step 4) is 10-15 min.

6. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: In step 5), the binder is a CMC solution or a PVDF solution.

7. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: In step 5), CMC solution is used as a binder with a concentration of 20-25 mg / mL, an amount of 0.5 mL, and an amount of ethylene glycol of 556.5-1669.5 mg.

8. The method for preparing a plating solution for improving the compatibility of metals with environmentally friendly alternative gases in gas-insulated equipment according to claim 1, characterized in that: In step 5), the rotation speed of the magnetic stirrer is 600 r / min, the stirring time is 8-10 h, and an ultrasonic cleaner is used for ultrasonication. The power of the ultrasonic cleaner is set to 80%, and the ultrasonication time is 0.5-1 h.

9. A plating solution prepared according to the preparation method according to any one of claims 1 to 8.

10. An application of a plating solution prepared according to any one of claims 1 to 8 as a silver plating solution to be plated on a copper surface to protect copper metal materials from corrosion by carbon-fluorine-based environmentally friendly insulating gases.

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