Processing technology of graphene composite conductive coating

Abstract

The invention discloses a processing technology of a graphene composite conductive coating, and relates to the technical field of coatings. The preparation method comprises the following steps: putting polyvinylpyrrolidone powder and ultrapure water into a mixing kettle, stirring and dissolving to obtain a polyvinylpyrrolidone dissolving solution; the self-made conductive filler, waterborne polyurethane and the polyvinylpyrrolidone dissolving solution are placed in a mixing tank, ultrasonic treatment is carried out, and the graphene composite conductive coating is obtained; dripping the uniformly mixed graphene composite conductive coating on a clean glass plate by using a dropper, and coating by using a wet film manual coater; and curing the obtained coating sample in a constant-temperature oven to obtain the graphene composite conductive coating. The graphene composite conductive coating prepared by the invention has excellent conductivity and mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of coating materials, and in particular to a processing technology for a graphene composite conductive coating. Background Art

[0002] Conductive coating is a functional coating with good acid and alkali resistance, strong adhesion and conductivity. It can eliminate static charge and conductive current in the matrix, and has broad development prospects in the electronics, aerospace, petrochemical and other industries.12-91. Conductive coatings are usually made by adding conductive particles to insulating polymer matrix materials to give them excellent conductive properties. The quality of its conductivity depends largely on the dispersion of conductive particles in the matrix material and their intrinsic conductivity. Therefore, choosing the right filler is particularly critical for building efficient conductive paths and achieving low percolation behavior, and for preparing coatings with excellent conductive properties.

[0003] Conductive fillers commonly used in conductive coatings are metal nanoparticles, such as Au, Ag, Cu, etc., but they are not conducive to promotion and application due to their high price, high density, poor stability and other disadvantages. Therefore, it is essential to develop conductive fillers with high conductivity, good stability and light weight. Graphene, as a new type of carbon material, has excellent electrical conductivity, thermal conductivity and mechanical properties7. Compared with metal fillers, it can provide high-performance lightweight fillers +4. MingkunYang et al. 98] added graphene and antimony oxide tin powder to epoxy resin to prepare conductive anticorrosion coatings. After adding an appropriate amount of graphene, the surface conductivity of the coating increased by nearly 10 times. Amir Rezvani Moghaddam et al. added graphene oxide dispersion to epoxy resin, and obtained epoxy-graphene nanocomposite materials after curing and high-temperature treatment. When the graphene loading was 1.5wt%, the coating conductivity was 0.5S / m. Therefore, graphene is an ideal candidate as a conductive filler. Therefore, the present invention provides a processing technology for graphene composite conductive coatings. Summary of the invention

[0004] The purpose of the present invention is to provide a processing technology for a graphene composite conductive coating to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A processing technology for a graphene composite conductive coating comprises the following preparation steps:

[0007] (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:100-1:150, stirring and dissolving at a speed of 600-800 r / min for 30-40 minutes to obtain a polyvinyl pyrrolidone solution;

[0008] (2) taking 10-20 parts of a homemade conductive filler, 20-30 parts of an aqueous polyurethane, and 20-30 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 20-30 minutes to obtain a graphene composite conductive coating;

[0009] (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator;

[0010] (4) The obtained coating sample is placed in a constant temperature oven at 130-140° C. for curing for 30-50 min to obtain a graphene composite conductive coating.

[0011] Preferably, the preparation method of the homemade conductive filler in step (2) is: placing the pretreated graphene and water in a reactor at a ratio of 1:20-1:30, then ultrasonically treating for 20-30 minutes, then adding 2-3 times the mass of graphene oxide and 5-8 times the mass of graphene oxide with a mass fraction of 20-30% ammonia water, stirring and refluxing for 6-8 hours at a temperature of 90-100° C. and a rotation speed of 600-800 r / min, filtering to obtain a filter cake, and then washing the filter cake with anhydrous ethanol for 5-8 times. Subsequently, the filter cake is dried to obtain a dry filter cake; by weight, 5-8 parts of the dry filter cake, 3-5 parts of a hydrochloric acid solution with a mass fraction of 30-40%, 1-2 parts of sodium nitrite and 3-5 parts of pretreated multi-walled carbon nanotubes, and 40-80 parts of deionized water are taken, and the dry filter cake, hydrochloric acid solution, sodium nitrite and pretreated multi-walled carbon nanotubes, and deionized water are placed in a reactor 1, and stirred and refluxed for reaction for 6-8 hours at a temperature of 90-100° C. and a rotation speed of 400-600 r / min, and then filtered, washed, and dried to obtain a self-made conductive filler.

[0012] Preferably, the preparation process of pretreated graphene is as follows: by weight, 3-5 parts of potassium persulfate, 20-30 parts of water, 2-3 parts of sulfuric acid with a mass fraction of 98%, 2-3 parts of expanded graphite, and 40-50 parts of anhydrous ethanol are taken, and the potassium persulfate and water are placed in a reactor 2, and stirred for 20-30 minutes at a speed of 500-600r / min, and then sulfuric acid is added dropwise, and stirred for 20-30 minutes at a speed of 500-600r / min, and then expanded graphite is added, and the temperature is 60-80°C and the speed is 600-800r / min. The reaction is stirred for 1-2h, and then filtered, the filter residue is washed with sodium hydroxide solution until neutral, the washed filter residue is mixed with anhydrous ethanol, placed in an ultrasonic disperser, and after ultrasonic treatment for 10-20min, filtered, and freeze-dried to obtain pretreated graphene.

[0013] Preferably, the preparation method of the pretreated multi-walled carbon nanotubes is: mixing the multi-walled carbon nanotubes with a mixture of sulfuric acid and nitric acid in a mass ratio of 1:20-1:30, stirring and reacting for 2-4 hours at a temperature of 60-80°C and a rotation speed of 400-600r / min, then adding hydrochloric acid and ammonia water with a mass fraction of 10-15% to remove impurities, filtering, and drying to obtain the pretreated multi-walled carbon nanotubes.

[0014] Preferably, the sulfuric acid and nitric acid mixture is prepared by mixing only sulfuric acid and nitric acid in a mass ratio of 1:3.

[0015] In summary, due to the adoption of the above technology, the beneficial effects of the present invention are:

[0016] The invention increases the electrical conductivity and mechanical properties of the system by adding self-made fillers and using pretreated graphene oxide and pretreated carbon nanotubes in combination. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0018] Example 1

[0019] A processing technology for a graphene composite conductive coating comprises the following preparation steps:

[0020] (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:100, stirring and dissolving at a speed of 800 r / min for 30 minutes to obtain a polyvinyl pyrrolidone solution;

[0021] (2) taking 20 parts of a homemade conductive filler, 20 parts of an aqueous polyurethane, and 30 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 20 minutes to obtain a graphene composite conductive coating;

[0022] (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator;

[0023] (4) The obtained coating sample is placed in a constant temperature oven at 140° C. for curing for 50 min to obtain a graphene composite conductive coating.

[0024] The preparation method of the homemade conductive filler in step (2) is as follows: pretreated graphene and water are placed in a reactor at a ratio of 1:20, followed by ultrasonic treatment for 30 minutes, followed by adding p-phenylenediamine 3 times the mass of graphene oxide and ammonia water 8 times the mass of graphene oxide with a mass fraction of 30%, stirring and refluxing for 8 hours at a temperature of 90°C and a rotation speed of 600r / min, filtering to obtain a filter cake, then washing the filter cake 5 times with anhydrous ethanol, and then drying the filter cake to obtain a dry filter cake; by weight, taking 8 parts of the dry filter cake, 5 parts of a hydrochloric acid solution with a mass fraction of 30%, 2 parts of sodium nitrite and 5 parts of pretreated multi-walled carbon nanotubes, and 40 parts of deionized water, placing the dry filter cake, hydrochloric acid solution, sodium nitrite and pretreated multi-walled carbon nanotubes, and deionized water in a reactor 1, stirring and refluxing for 6 hours at a temperature of 100°C and a rotation speed of 400r / min, filtering, washing, and drying to obtain a homemade conductive filler.

[0025] The preparation process of pretreated graphene is as follows: 5 parts of potassium persulfate, 20 parts of water, 3 parts of sulfuric acid with a mass fraction of 98%, 2 parts of expanded graphite, and 50 parts of anhydrous ethanol are taken by weight, the potassium persulfate and water are placed in a reaction kettle 2, and stirred for 20 minutes at a rotation speed of 600 r / min, then sulfuric acid is added dropwise, and stirred for 30 minutes at a rotation speed of 600 r / min, and then expanded graphite is added, and the temperature is 60°C and the rotation speed is 800 r / min. The reaction is stirred for 2 hours, and then filtered, the filter residue is washed with sodium hydroxide solution until neutral, the washed filter residue is mixed with anhydrous ethanol, placed in an ultrasonic disperser, and after ultrasonic treatment for 20 minutes, filtered, and freeze-dried to obtain pretreated graphene.

[0026] The preparation method of the pretreated multi-walled carbon nanotubes is as follows: the multi-walled carbon nanotubes are mixed with a sulfuric acid and nitric acid mixture in a mass ratio of 1:20, stirred for reaction for 2 hours at a temperature of 80° C. and a rotation speed of 600 r / min, and then 15% by mass hydrochloric acid and ammonia water are added to remove impurities, filtered, and dried to obtain the pretreated multi-walled carbon nanotubes.

[0027] The sulfuric acid and nitric acid mixture is prepared by mixing only sulfuric acid and nitric acid in a mass ratio of 1:3.

[0028] Example 2

[0029] A processing technology for a graphene composite conductive coating comprises the following preparation steps:

[0030] (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:150, stirring and dissolving at a speed of 700 r / min for 30 minutes to obtain a polyvinyl pyrrolidone solution;

[0031] (2) taking 20 parts of a homemade conductive filler, 20 parts of an aqueous polyurethane, and 30 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 30 minutes to obtain a graphene composite conductive coating;

[0032] (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator;

[0033] (4) The obtained coating sample is placed in a constant temperature oven at 140° C. for curing for 50 min to obtain a graphene composite conductive coating.

[0034] The preparation method of the homemade conductive filler in step (2) is as follows: pretreated graphene and water are placed in a reactor at a ratio of 1:20, followed by ultrasonic treatment for 20 minutes, followed by adding p-phenylenediamine 3 times the mass of graphene oxide and ammonia water 8 times the mass of graphene oxide with a mass fraction of 20%, stirring and refluxing for 8 hours at a temperature of 90°C and a rotation speed of 800r / min, filtering to obtain a filter cake, then washing the filter cake 8 times with anhydrous ethanol, and then drying the filter cake to obtain a dry filter cake; by weight, take 5 parts of the dry filter cake, 5 parts of a hydrochloric acid solution with a mass fraction of 40%, 1 part of sodium nitrite and 5 parts of pretreated multi-walled carbon nanotubes, and 40 parts of deionized water, and place the dry filter cake, hydrochloric acid solution, sodium nitrite and pretreated multi-walled carbon nanotubes, and deionized water in a reactor 1, stirring and refluxing for 7 hours at a temperature of 100°C and a rotation speed of 500r / min, filtering, washing, and drying to obtain a homemade conductive filler.

[0035] The preparation process of pretreated graphene is as follows: 5 parts of potassium persulfate, 20 parts of water, 3 parts of sulfuric acid with a mass fraction of 98%, 2 parts of expanded graphite, and 50 parts of anhydrous ethanol are taken by weight, the potassium persulfate and water are placed in a reaction kettle 2, and stirred for 26 minutes at a rotation speed of 600 r / min, then sulfuric acid is added dropwise, and stirred for 30 minutes at a rotation speed of 600 r / min, and then expanded graphite is added, and stirred for reaction for 1 hour at a temperature of 70°C and a rotation speed of 800 r / min, and then filtered, the filter residue is washed with a sodium hydroxide solution until neutral, the washed filter residue is mixed with anhydrous ethanol, placed in an ultrasonic disperser, and after ultrasonic treatment for 20 minutes, filtered, and freeze-dried to obtain pretreated graphene.

[0036] The preparation method of the pretreated multi-walled carbon nanotubes is as follows: the multi-walled carbon nanotubes are mixed with a sulfuric acid and nitric acid mixture in a mass ratio of 1:30, stirred for reaction for 3 hours at a temperature of 80° C. and a rotation speed of 400 r / min, and then 10% by mass hydrochloric acid and ammonia water are added to remove impurities, filtered, and dried to obtain the pretreated multi-walled carbon nanotubes.

[0037] The sulfuric acid and nitric acid mixture is prepared by mixing only sulfuric acid and nitric acid in a mass ratio of 1:3.

[0038] Example 3

[0039] A processing technology for a graphene composite conductive coating comprises the following preparation steps:

[0040] (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:150, stirring and dissolving at a speed of 600 r / min for 40 minutes to obtain a polyvinyl pyrrolidone solution;

[0041] (2) Taking 10 parts of a homemade conductive filler, 30 parts of an aqueous polyurethane, and 20 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 30 minutes to obtain a graphene composite conductive coating;

[0042] (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator;

[0043] (4) The obtained coating sample was placed in a constant temperature oven at 135° C. for curing for 50 min to obtain a graphene composite conductive coating.

[0044] The preparation method of the homemade conductive filler in step (2) is as follows: pretreated graphene and water are placed in a reactor at a ratio of 1:20, followed by ultrasonic treatment for 30 minutes, followed by adding p-phenylenediamine twice the mass of graphene oxide and ammonia water 6 times the mass of graphene oxide with a mass fraction of 30%, stirring and refluxing for 8 hours at a temperature of 90° C. and a rotation speed of 800 r / min, filtering to obtain a filter cake, then washing the filter cake 8 times with anhydrous ethanol, and then drying the filter cake to obtain a dry filter cake; by weight, take 5 parts of the dry filter cake, 5 parts of a hydrochloric acid solution with a mass fraction of 35%, 1 part of sodium nitrite and 5 parts of pretreated multi-walled carbon nanotubes, and 60 parts of deionized water, place the dry filter cake, hydrochloric acid solution, sodium nitrite and pretreated multi-walled carbon nanotubes, and deionized water in a reactor 1, stir and reflux for 8 hours at a temperature of 100° C. and a rotation speed of 400 r / min, filter, wash, and dry to obtain a homemade conductive filler.

[0045] The preparation process of pretreated graphene is as follows: 3 parts of potassium persulfate, 30 parts of water, 2 parts of sulfuric acid with a mass fraction of 98%, 2 parts of expanded graphite, and 50 parts of anhydrous ethanol are taken by weight, potassium persulfate and water are placed in a reaction kettle 2, stirred for 30 minutes at a rotation speed of 600 r / min, then sulfuric acid is added dropwise, stirred for 20 minutes at a rotation speed of 600 r / min, then expanded graphite is added, stirred for reaction for 2 hours at a temperature of 60°C and a rotation speed of 700 r / min, then filtered, the filter residue is washed with a sodium hydroxide solution until neutral, the washed filter residue is mixed with anhydrous ethanol, placed in an ultrasonic disperser, ultrasonically treated for 20 minutes, filtered, and freeze-dried to obtain pretreated graphene.

[0046] The preparation method of the pretreated multi-walled carbon nanotubes is as follows: the multi-walled carbon nanotubes are mixed with a sulfuric acid and nitric acid mixture in a mass ratio of 1:20, stirred for reaction for 2 hours at a temperature of 80° C. and a rotation speed of 400 r / min, and then 15% by mass hydrochloric acid and ammonia water are added to remove impurities, filtered, and dried to obtain the pretreated multi-walled carbon nanotubes.

[0047] The sulfuric acid and nitric acid mixture is prepared by mixing only sulfuric acid and nitric acid in a mass ratio of 1:3.

[0048] Comparative Example 1

[0049] A processing technology for a graphene composite conductive coating comprises the following preparation steps:

[0050] (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:150, stirring and dissolving at a speed of 600 r / min for 40 minutes to obtain a polyvinyl pyrrolidone solution;

[0051] (2) Taking 10 parts of a homemade conductive filler, 30 parts of an aqueous polyurethane, and 20 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 30 minutes to obtain a graphene composite conductive coating;

[0052] (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator;

[0053] (4) The obtained coating sample was placed in a constant temperature oven at 135° C. for curing for 50 min to obtain a graphene composite conductive coating.

[0054] The preparation method of the homemade conductive filler in step (2) is as follows: placing graphene and water in a reactor at a ratio of 1:20, then ultrasonically treating for 30 minutes, then adding p-phenylenediamine twice the mass of graphene oxide and ammonia water 6 times the mass of graphene oxide with a mass fraction of 30%, stirring and refluxing for 8 hours at a temperature of 90° C. and a rotation speed of 800 r / min, filtering to obtain a filter cake, then washing the filter cake 8 times with anhydrous ethanol, and then drying the filter cake to obtain a dry filter cake; taking 5 parts of the dry filter cake, 5 parts of a hydrochloric acid solution with a mass fraction of 35%, 1 part of sodium nitrite and 5 parts of pretreated multi-walled carbon nanotubes, and 60 parts of deionized water by weight, placing the dry filter cake, the hydrochloric acid solution, the sodium nitrite and the pretreated multi-walled carbon nanotubes, and the deionized water in a reactor 1, stirring and refluxing for 8 hours at a temperature of 100° C. and a rotation speed of 400 r / min, filtering, washing, and drying to obtain a homemade conductive filler.

[0055] The preparation method of the pretreated multi-walled carbon nanotubes is as follows: the multi-walled carbon nanotubes are mixed with a sulfuric acid and nitric acid mixture in a mass ratio of 1:20, stirred for reaction for 2 hours at a temperature of 80° C. and a rotation speed of 400 r / min, and then 15% by mass hydrochloric acid and ammonia water are added to remove impurities, filtered, and dried to obtain the pretreated multi-walled carbon nanotubes.

[0056] The sulfuric acid and nitric acid mixture is prepared by mixing only sulfuric acid and nitric acid in a mass ratio of 1:3.

[0057] Comparative Example 2

[0058] A processing technology for a graphene composite conductive coating comprises the following preparation steps:

[0059] (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:150, stirring and dissolving at a speed of 600 r / min for 40 minutes to obtain a polyvinyl pyrrolidone solution;

[0060] (2) Taking 10 parts of a homemade conductive filler, 30 parts of an aqueous polyurethane, and 20 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 30 minutes to obtain a graphene composite conductive coating;

[0061] (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator;

[0062] (4) The obtained coating sample was placed in a constant temperature oven at 135° C. for curing for 50 min to obtain a graphene composite conductive coating.

[0063] The preparation method of the homemade conductive filler in step (2) is as follows: pre-treated graphene and water are placed in a reactor at a ratio of 1:20, followed by ultrasonic treatment for 30 minutes, followed by adding p-phenylenediamine twice the mass of graphene oxide and ammonia water 6 times the mass of graphene oxide with a mass fraction of 30%, stirring and refluxing for 8 hours at a temperature of 90° C. and a rotation speed of 800 r / min, filtering to obtain a filter cake, then washing the filter cake 8 times with anhydrous ethanol, and then drying the filter cake to obtain a dry filter cake; by weight, take 5 parts of the dry filter cake, 5 parts of a hydrochloric acid solution with a mass fraction of 35%, 1 part of sodium nitrite and 5 parts of multi-walled carbon nanotubes, and 60 parts of deionized water, place the dry filter cake, hydrochloric acid solution, sodium nitrite and multi-walled carbon nanotubes, and deionized water in a reactor 1, stir and reflux for 8 hours at a temperature of 100° C. and a rotation speed of 400 r / min, filter, wash, and dry to obtain a homemade conductive filler.

[0064] The preparation process of pretreated graphene is as follows: 3 parts of potassium persulfate, 30 parts of water, 2 parts of sulfuric acid with a mass fraction of 98%, 2 parts of expanded graphite, and 50 parts of anhydrous ethanol are taken by weight, potassium persulfate and water are placed in a reaction kettle 2, stirred for 30 minutes at a rotation speed of 600 r / min, then sulfuric acid is added dropwise, stirred for 20 minutes at a rotation speed of 600 r / min, then expanded graphite is added, stirred for reaction for 2 hours at a temperature of 60°C and a rotation speed of 700 r / min, then filtered, the filter residue is washed with a sodium hydroxide solution until neutral, the washed filter residue is mixed with anhydrous ethanol, placed in an ultrasonic disperser, ultrasonically treated for 20 minutes, filtered, and freeze-dried to obtain pretreated graphene.

[0065] Detection method:

[0066] Table 1

[0067]

[0068] From the comparison between Examples 1-3 and Comparative Examples 1-2 in Table 1, it can be seen that the present invention increases the conductivity and mechanical properties of the system by adding homemade fillers and using pretreated graphene oxide and pretreated carbon nanotubes in combination.

[0069] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A processing technology for graphene composite conductive coating, characterized in that: The method comprises the following preparation steps: (1) placing polyvinyl pyrrolidone powder and ultrapure water in a mixing kettle at a mass ratio of 1:100-1:150, stirring and dissolving at a speed of 600-800 r / min for 30-40 minutes to obtain a polyvinyl pyrrolidone solution; (2) taking 10-20 parts of a homemade conductive filler, 20-30 parts of an aqueous polyurethane, and 20-30 parts of a polyvinyl pyrrolidone solution by weight, placing the homemade conductive filler, the aqueous polyurethane, and the polyvinyl pyrrolidone solution in a mixing tank, and ultrasonically treating for 20-30 minutes to obtain a graphene composite conductive coating; (3) using a dropper to drop the graphene composite conductive coating onto a clean glass plate, and then applying the coating using a wet film manual applicator; (4) The obtained coating sample is placed in a constant temperature oven at 130-140° C. for curing for 30-50 min to obtain a graphene composite conductive coating.

2. The processing technology of a graphene composite conductive coating according to claim 1, characterized in that: The preparation method of the self-made conductive filler in step (2) is as follows: pre-treated graphene and water are placed in a reactor at a ratio of 1:20-1:30, followed by ultrasonic treatment for 20-30 minutes, followed by adding p-phenylenediamine 2-3 times the mass of graphene oxide and ammonia water 5-8 times the mass of graphene oxide with a mass fraction of 20-30%, stirring and refluxing for 6-8 hours at a temperature of 90-100° C. and a rotation speed of 600-800 r / min, filtering to obtain a filter cake, and then washing the filter cake with anhydrous ethanol for 5-8 times, and then The filter cake is dried to obtain a dry filter cake; by weight, 5-8 parts of the dry filter cake, 3-5 parts of a hydrochloric acid solution with a mass fraction of 30-40%, 1-2 parts of sodium nitrite and 3-5 parts of pretreated multi-walled carbon nanotubes, and 40-80 parts of deionized water are taken, and the dry filter cake, the hydrochloric acid solution, the sodium nitrite and the pretreated multi-walled carbon nanotubes, and the deionized water are placed in a reaction kettle 1, and under the conditions of a temperature of 90-100° C. and a rotation speed of 400-600 r / min, the mixture is stirred and refluxed for a reaction for 6-8 hours, and then filtered, washed, and dried to obtain a self-made conductive filler.

3. The processing technology of a graphene composite conductive coating according to claim 2, characterized in that: The preparation process of the pretreated graphene is as follows: by weight, 3-5 parts of potassium persulfate, 20-30 parts of water, 2-3 parts of sulfuric acid with a mass fraction of 98%, 2-3 parts of expanded graphite, and 40-50 parts of anhydrous ethanol are taken, the potassium persulfate and water are placed in a reaction kettle 2, and stirred for 20-30 minutes at a rotation speed of 500-600 r / min, then sulfuric acid is added dropwise, and stirred for 20-30 minutes at a rotation speed of 500-600 r / min, and then expanded graphite is added, and the temperature is 60-80°C and the rotation speed is 600-800 r / min. The reaction is stirred for 1-2 hours, and then filtered, the filter residue is washed with a sodium hydroxide solution until neutral, the washed filter residue is mixed with anhydrous ethanol, placed in an ultrasonic disperser, and after ultrasonic treatment for 10-20 minutes, filtered, and freeze-dried to obtain the pretreated graphene.

4. The processing technology of a graphene composite conductive coating according to claim 2, characterized in that: The preparation method of the pretreated multi-walled carbon nanotubes is as follows: the multi-walled carbon nanotubes are mixed with a sulfuric acid and nitric acid mixture in a mass ratio of 1:20-1:30, stirred for reaction for 2-4 hours at a temperature of 60-80° C. and a rotation speed of 400-600 r / min, and then hydrochloric acid and ammonia water with a mass fraction of 10-15% are added to remove impurities, filtered, and dried to obtain the pretreated multi-walled carbon nanotubes.

5. The processing technology of a graphene composite conductive coating according to claim 4, characterized in that: The sulfuric acid and nitric acid mixture is prepared by mixing only sulfuric acid and nitric acid in a mass ratio of 1:3.

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