A conductive coating, its preparation method and application

Abstract

A conductive coating, its preparation method and application. The conductive coating is composed of component A, component B and component C. By weight, component A is 100 parts, component B is 8 - 12 parts, and component C is 10 - 25 parts; wherein, by weight, component A includes: 20 - 45 parts of fluorocarbon resin, 10 - 30 parts of filler, 5 - 17 parts of pigment, 3 - 7 parts of carbon nanotube / graphene conductive paste, 2 - 6 parts of auxiliary agent, 10 - 20 parts of first diluent and 1 - 2 parts of matting powder; component B: 8 - 12 parts of curing agent, component C: 10 - 25 parts of second diluent. The conductive coating of this application has high storage stability, and its rich network structure enables the coating to achieve better ion and electron transmission capabilities, giving full play to the conductive function of carbon nanotube / graphene.

Description

Technical Field

[0001] This article relates to the field of coating technology, and relates to a conductive coating containing carbon nanotube / graphene conductive paste, its preparation method and application, in particular to a conductive coating with high storage stability, its preparation method and application. Background Art

[0002] When an airplane flies at high speed in a complex high-altitude environment, its surface will generate strong frictional force with the air, thus causing electrostatic phenomena. If the static electricity cannot be released in time and effectively, it will interfere with the aircraft's electronic equipment and seriously affect the normal operation of the aircraft. Therefore, the surface of the aircraft needs to be coated with antistatic coatings, and it is required to have conductive functions and good mechanical properties. Most of the commonly used conductive coatings on the market at present add conductive fillers such as carbon black, conductive fibers, and conductive mica powder to the coatings. Although conductive fibers have good electrical conductivity, their ability to control resistance values is poor, and they are easily broken down to cause harm, and their dispersibility is poor, resulting in uneven distribution of the coating resistance value, so they cannot be used in aircraft conductive coatings.

[0003] Carbon nanotubes are a tubular structure composed of carbon atoms, which are an isotope allotrope of crystalline carbon. They are light in weight, with a perfect connection of hexagonal structures, and have many abnormal mechanical, electrical and chemical properties. Moreover, the resistance has nothing to do with its length and diameter, and no heat is generated when electrons pass through carbon nanotubes. Therefore, the transmission of electrons in carbon nanotubes is like the transmission of optical signals in optical fiber cables, with minimal energy loss, and it is an excellent conductive material. Graphene is a single-atom layer graphite sheet, with a two-dimensional honeycomb crystal structure densely packed with sp2 hybridized carbon atoms. It has excellent optical, mechanical, electrical and thermal properties, and has a large specific surface area and impermeability, showing very obvious advantages in electrical conductivity. Although both carbon nanotubes and graphene are good conductive materials, when used alone, they have problems such as poor dispersion performance and unqualified stability performance, resulting in a lack of practical research in the current market.

[0004] The invention patent CN116023846A proposes a carbon nanotube conductive static coating and its preparation method. This patent modifies carbon nanotubes to enhance the electrical conductivity of the coating, but carbon nanotubes have high viscosity and are difficult to disperse, and the patent does not involve the discussion of dispersants. The invention patent CN116731593A proposes a graphene conductive static coating and its preparation method. This patent uses a phenolic epoxy resin system to improve the corrosion resistance of the coating, but its weather resistance needs to be improved compared with fluorocarbon resin. Summary of the Invention

[0005] The following is an overview of the topics described in detail in this article. This overview is not intended to limit the protection scope of this application.

[0006] In this application, the dispersant in the graphene / carbon nanotube conductive paste is modified, greatly improving the dispersion effect, overcoming the defects of carbon nanotubes and graphene themselves, solving the problem of poor dispersion caused by the agglomeration state of carbon nanotubes, improving the storage stability, and then preparing a conductive coating with high storage stability. Moreover, the surface density of the coating is low, greatly reducing the flight resistance during the flight of the aircraft. Therefore, this application provides a conductive coating with good dispersion, good electrical conductivity, and good storage stability. The conductive coating with high storage stability prepared in this application has taken an important step in the use of conductive coatings for aircraft.

[0007] In the first aspect of this application, a conductive coating is provided. The conductive coating is composed of component A, component B, and component C. Among them, by weight, component A is 100 parts, component B is 8 - 12 parts, and component C is 10 - 25 parts.

[0008] In an exemplary embodiment, by weight, component A includes: 20 - 45 parts of fluorocarbon resin, 10 - 30 parts of filler, 5 - 17 parts of pigment, 3 - 7 parts of carbon nanotube / graphene conductive paste, 2 - 6 parts of additive, 10 - 20 parts of the first diluent, and 1 - 2 parts of flatting agent.

[0009] Component B: 8 - 12 parts of curing agent.

[0010] Component C: 10 - 25 parts of the second diluent.

[0011] In an exemplary embodiment, component A may further include other additives well known in the art.

[0012] In an exemplary embodiment, by weight, component A is composed of 20 - 45 parts of fluorocarbon resin, 10 - 30 parts of filler, 5 - 17 parts of pigment, 3 - 7 parts of carbon nanotube / graphene conductive paste, 2 - 6 parts of additive, 10 - 20 parts of the first diluent, and 1 - 2 parts of flatting agent.

[0013] In an exemplary embodiment, the carbon nanotube / graphene conductive paste, by weight, is composed of the following components: 0.15 - 0.6 parts of graphene, 0.1 - 0.6 parts of carbon nanotubes, 0.4 - 0.7 parts of positioning agent, 0.3 - 0.8 parts of modified dispersant, and 2.5 - 4 parts of the third diluent. Among them, the weight ratio of graphene to carbon nanotubes is 3:2.

[0014] In an exemplary embodiment, in the carbon nanotube / graphene conductive paste, the weight ratio of the carbon nanotube / graphene composite in the carbon nanotube / graphene conductive paste is 7 - 16%. At this time, the dispersion and storage stability of the carbon nanotube / graphene composite are relatively good.

[0015] In an exemplary embodiment, in order to further improve the anti-flocculation effect of the dispersant, the modified dispersant is a dispersant modified by a modifying compound to improve the adsorption of the dispersant on the surface of solid nanoparticles, enhance the wetting efficiency, and thereby shorten the grinding time;

[0016] Optionally, the modifying compound is imidazole or polyethylene glycol, and preferably, it is imidazole;

[0017] Optionally, the molar ratio of the active group of the dispersant to the modifying compound is from 1:1 to 1:2.

[0018] In an exemplary embodiment, the carbon nanotube / graphene conductive paste, by weight, consists of the following components: 0.3 parts of graphene, 0.2 parts of carbon nanotubes, 0.5 parts of modified dispersant, 0.5 parts of positioning agent, and 3 parts of a third diluent, wherein the graphene and carbon nanotubes are mixed at a weight ratio of 3:2; or

[0019] The carbon nanotube / graphene conductive paste, by weight, consists of the following components: 0.6 parts of graphene, 0.4 parts of carbon nanotubes, 0.8 parts of modified dispersant, 0.7 parts of positioning agent, and a third diluent, wherein the graphene and carbon nanotubes are mixed at a weight ratio of 3:2; or

[0020] The carbon nanotube / graphene conductive paste, by weight, consists of the following components: 0.15 parts of graphene, 0.1 parts of carbon nanotubes, 0.3 parts of modified dispersant, 0.4 parts of positioning agent, and 2.5 parts of a third diluent, wherein the graphene and carbon nanotubes are mixed at a weight ratio of 3:2.

[0021] In an exemplary embodiment, in the carbon nanotube / graphene conductive paste, the positioning agent is a cellulose ester-based positioning agent, and preferably, it is cellulose acetate butyrate.

[0022] In an exemplary embodiment, in the carbon nanotube / graphene conductive paste, the modified dispersant is a modified polymer type dispersant; the polymer type dispersant is selected from, for example, one or both of EFKA-4080 and BYK-220.

[0023] In an exemplary embodiment, the fluorocarbon resin is a chlorotrifluoroethylene-vinyl ester resin.

[0024] In an exemplary embodiment, the fluorocarbon resin is selected from at least one of JF-2X, JF-3, ZB-F100, and ZB-F200; preferably, it is JF-2X.

[0025] In an exemplary embodiment, the filler is an inorganic filler, optionally selected from at least one of talc, precipitated barium sulfate, and light calcium carbonate. The filler can reduce the friction coefficient and act as a lubricant.

[0026] In an exemplary embodiment, the particle size of the talc is 1250 mesh.

[0027] In an exemplary embodiment, the pigment is at least one of an organic pigment and an inorganic pigment; the color can be adjusted as needed to red, blue, black, yellow, etc.; preferably, the pigment is at least one of iron oxide red, phthalocyanine blue, carbon black, chrome yellow, and titanium dioxide.

[0028] In an exemplary embodiment, the additive is at least one of a leveling agent, a drying agent, and an adhesion promoter.

[0029] In an exemplary embodiment, the leveling agent is selected from at least one of BYK-358, L-1984N, and BYK-361N. The leveling agent can achieve the effects of leveling and improving shrinkage cavities.

[0030] In an exemplary embodiment, the drying agent is dibutyltin dilaurate; preferably, dibutyltin dilaurate diluted with xylene; more preferably, dibutyltin dilaurate diluted with 1 wt% xylene. The drying agent can accelerate the curing reaction of monomers and polymers in the coating.

[0031] In an exemplary embodiment, the adhesion promoter is selected from at least one of EDL-809 and EDL-6026F. The adhesion promoter can improve the adhesion performance between the coating and the substrate.

[0032] In an exemplary embodiment, the curing agent is an isocyanate; preferably, an aliphatic polyisocyanate, for example, at least one of HT-90B and N3390; more preferably, hexamethylene diisocyanate.

[0033] In an exemplary embodiment, the matting powder is ED-30.

[0034] In an exemplary embodiment, the first diluent, the second diluent, and the third diluent each include at least one of cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, and dibasic acid ester.

[0035] In an exemplary embodiment, the compositions of the first diluent, the second diluent, and the third diluent can be the same or different; preferably, the compositions of the first diluent, the second diluent, and the third diluent are different.

[0036] In an exemplary embodiment, the first diluent consists of cyclohexanone and xylene with a weight ratio of (1.0 - 2.0):(10 - 20).

[0037] In an exemplary embodiment, the second diluent consists of cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate and dibasic acid ester with a weight ratio of (1 - 2):(1 - 3):(20 - 30):(2 - 4):(4 - 8).

[0038] In an exemplary embodiment, the third diluent consists of cyclohexanone, butyl ester and dibasic acid ester with a weight ratio of (0.5 - 1):(2 - 2.5):(1 - 2).

[0039] In an exemplary embodiment, the conductive coating is composed of the following components in parts by weight:

[0040] Component A: 38 parts of fluorocarbon resin, 19 parts of filler, 15 parts of pigment, 4.5 parts of carbon nanotube / graphene conductive paste, 2 parts of matting powder, 5.5 parts of auxiliary agent, and 16 parts of the first diluent.

[0041] Component B: 10 parts of curing agent

[0042] Component C: 23 parts of the second diluent;

[0043] Among them, the weight ratio of Component A, Component B, and Component C is 100:10:23.

[0044] In an exemplary embodiment, the conductive coating is composed of the following components in parts by weight:

[0045] Component A: 40 parts of fluorocarbon resin, 21 parts of filler, 12 parts of pigment, 6.5 parts of carbon nanotube / graphene conductive paste, 1.5 parts of matting powder, 5.5 parts of auxiliary agent, and 13.5 parts of the first diluent.

[0046] Component B: 10 parts of curing agent

[0047] Component C: 23 parts of the second diluent;

[0048] Among them, the weight ratio of Component A, Component B, and Component C is 100:10:23.

[0049] In an exemplary embodiment, the conductive coating is composed of the following components in parts by weight:

[0050] Component A: 38 parts of fluorocarbon resin, 20 parts of filler, 16.5 parts of pigment, 3.45 parts of carbon nanotube / graphene conductive paste, 2 parts of matting powder, 5.5 parts of auxiliary agent, and 14.55 parts of the first diluent.

[0051] Component B: 10 parts of curing agent

[0052] Component C: 23 parts of the second diluent;

[0053] Among them, the weight ratio of Component A, Component B, and Component C is 100:10:23.

[0054] The second aspect of this application provides a preparation method of the above conductive coating, and the method includes the following steps:

[0055] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene composite, the modified dispersant, the positioning agent, and the third diluent to prepare a stable carbon nanotube / graphene conductive paste;

[0056] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, auxiliary agent, the first diluent, and the flatting agent, and grind the blended mixture to obtain Component A;

[0057] Step 3: Add the curing agent of Component B and the second diluent of Component C to Component A and stir to obtain a conductive coating with high storage stability.

[0058] In an exemplary embodiment, Step 1 further includes the modification treatment of the dispersant: dissolve the dispersant with a solvent, add the modifying compound and stir until completely dissolved; heat the reaction system and react under nitrogen protection; after the reaction is completed, remove the solvent to obtain the modified dispersant.

[0059] In an exemplary embodiment, in the modification treatment, the solvent is tetrahydrofuran.

[0060] In an exemplary embodiment, in the modification treatment, the molar ratio of the active group of the dispersant to the modifying compound is 1:1 to 1:2.

[0061] In an exemplary embodiment, in the modification treatment, the heating temperature is 60 - 80 °C.

[0062] In an exemplary embodiment, in the modification treatment, the reaction time is 6 - 10 h; preferably, it is 8 h.

[0063] In an exemplary embodiment, in Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser, where,

[0064] Optionally, the power of the ultrasonic disperser is 800 W;

[0065] Optionally, the ultrasonic dispersion time is 5 - 30 min;

[0066] Optionally, the temperature during ultrasonic dispersion does not exceed 30°C, because the slurry tends to agglomerate when the temperature exceeds 30°C.

[0067] In an exemplary embodiment, in step 1 and step 2, the rotation speed of the high-speed stirring is 1000 rad / min-1200 rad / min.

[0068] In an exemplary embodiment, in step 1 and step 2, the time of high-speed stirring is 1-3 hours.

[0069] In an exemplary embodiment, in step 2, the blended mixture is ground to a fineness within 25 μm;

[0070] In an exemplary embodiment, in step 2, the grinding time is 1-2 hours.

[0071] In an exemplary embodiment, in step three, the stirring time is 0.2-1 h, preferably, the stirring time is 0.5 h.

[0072] The third aspect of the present application provides a conductive coating prepared by the above method.

[0073] A fourth aspect of the present application provides an application of the above-mentioned conductive coating on the surface of an aircraft.

[0074] In one exemplary embodiment, the conductive coating may be used as a primer or a topcoat.

[0075] A fifth aspect of the present application provides a coating formed by the above-mentioned conductive coating, wherein the coating is formed by applying the conductive coating onto a substrate and curing it.

[0076] In one exemplary embodiment, the substrate is an aircraft surface.

[0077] The beneficial effects of this application are embodied in:

[0078] 1. In the present application, carbon nanotubes and graphene are compounded to prepare a carbon nanotube / graphene conductive paste, which overcomes the defects of carbon nanotubes and graphene themselves, solves the problem of poor dispersibility caused by the agglomeration state of carbon nanotubes, improves storage stability, and thus prepares a conductive coating with high storage stability.

[0079] 2. The conductive coating prepared in this application has good conductivity (i.e., surface resistance ≤ 10 6 Ω / sq) and three-proof properties, and has excellent bonding with the substrate and matching primer.

[0080] 3. The dispersant of the present application is modified to achieve a better dispersion effect in graphene carbon nanotubes, enhancing the conductive path between graphene and carbon nanotubes and making the conductive performance of the coating stronger.

[0081] 4. In the process of preparing the conductive coating with high storage stability, the present application optimizes the compounding process of graphene and carbon nanotubes, adds a quantitative polymer dispersant, forms an adsorption layer on the surface of solid particles, increases the charge on the surface of solid particles, improves the reaction force between particles forming steric hindrance, and enables the filler to be stably dispersed in the system. In the case of low viscosity, the conductive coating can be evenly coated, effectively improving the stability of the conductive coating and increasing the viscosity without affecting the coating effect. The present application takes into account the advantages of low viscosity and high dispersibility of the conductive coating, has the characteristics of convenient and simple construction, reduces the processing cost, and ensures the high stability of the product. It is a technical solution that can be practically applied in industry.

[0082] Other features and advantages of the present application will be described in the subsequent specification, and part of them will be obvious from the specification or understood by implementing the present application. Other advantages of the present application can be achieved and obtained through the solutions described in the specification and the drawings. Description of the Drawings

[0083] The drawings are used to provide an understanding of the technical solution of the present application, constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, but do not constitute a limitation to the technical solution of the present application.

[0084] Figure 1 It is the initial particle size distribution diagram of the coatings obtained by using different dispersants;

[0085] Figure 2 It is the particle size distribution diagram of the coatings obtained by using different dispersants after 30 days of thermal storage experiment. Detailed Embodiments

[0086] To make the purpose, technical solution and advantages of the present application clearer, the embodiments of the present application will be described in detail below. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0087] The following further describes the present invention in detail with specific examples, but these examples should not be construed as limiting the present invention. The raw materials of the present application are all conventional products in the market.

[0088] Example 1

[0089] This example provides a conductive coating and its preparation method. The conductive coating is composed of the following components in parts by weight:

[0090] Component A: 38 parts of fluorocarbon resin JF-2X, 11 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 1 part of carbon black, 4.5 parts of carbon nanotube / graphene conductive paste, 2 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-809, 1.5 parts of leveling agent BYK-358, 2 parts of drying agent dibutyltin dilaurate diluted with 1%wt xylene, 16 parts of first diluent (1.5 parts of cyclohexanone, 15 parts of xylene)

[0091] Component B: 10 parts of isocyanate curing agent HT-90B

[0092] Component C: 23 parts of second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 22 parts of xylene, 2.3 parts of butyl acetate, 4 parts of phthalate ester).

[0093] The carbon nanotube / graphene conductive paste consists of the following components: 0.3 parts of graphene, 0.2 parts of carbon nanotubes, 0.5 parts of modified polymer type dispersant BYK161, 0.5 parts of positioning agent cellulose acetate butyrate, 3 parts of third diluent (0.5 parts of cyclohexanone, 2 parts of butyl acetate, 1 part of phthalate ester), and graphene and carbon nanotubes are mixed in a weight ratio of 3:2.

[0094] The mass ratio of Component A to Component B is 100:10.

[0095] The preparation of the conductive coating includes the following steps:

[0096] Step 1: Completely dissolve the dispersant in tetrahydrofuran, add imidazole and stir until completely dissolved. Among them, the molar ratio of the active group of the dispersant to imidazole is 1:1; heat the reaction system to 60 °C and react for 8 h under nitrogen protection; after the reaction is completed, remove the solvent by rotary evaporation to obtain the modified dispersant;

[0097] Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene composite, modified dispersant, positioning agent, and third diluent to prepare a stable carbon nanotube / graphene conductive paste;

[0098] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, auxiliary agent, first diluent, and matting powder to prepare Component A; among them, in Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser, the power of the ultrasonic disperser is 800 W, ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, grind the blended mixture for 1 hour until the fineness of the scraping plate is controlled within 25 µm to obtain Component A;

[0099] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A, and stir for half an hour to obtain a conductive coating with high storage stability.

[0100] Example 2

[0101] This example provides a conductive coating and a preparation method thereof. The conductive coating is composed of the following components in parts by weight:

[0102] Component A: 40 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 4 parts of light calcium carbonate, 10 parts of titanium dioxide, 2 parts of medium chrome yellow 103, 6.5 parts of carbon nanotube / graphene conductive paste, 1.5 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-809, 1.5 parts of leveling agent L-1984N, 2 parts of drier dibutyltin dilaurate diluted with 1%wt xylene, 13.5 parts of first diluent (1.1 parts of cyclohexanone, 13 parts of xylene),

[0103] Component B: 10 parts of isocyanate curing agent N3390,

[0104] Component C: 23 parts of second diluent (1 part of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 25 parts of xylene, 3 parts of butyl acetate, 6 parts of phthalate).

[0105] The carbon nanotube / graphene conductive paste is composed of the following components: 0.6 part of graphene, 0.4 part of carbon nanotubes, 0.8 part of modified polymer type dispersant BYK161, 0.7 part of positioning agent cellulose acetate butyrate, 4 parts of third diluent (0.5 part of cyclohexanone, 2 parts of butyl acetate, 1 part of phthalate). Graphene and carbon nanotubes are mixed in a weight ratio of 3:2.

[0106] The mass ratio of Component A to Component B is 100:10.

[0107] The preparation of the conductive coating with high storage stability includes the following steps:

[0108] Step 1: Completely dissolve the dispersant in tetrahydrofuran, add imidazole and stir until completely dissolved. Among them, the molar ratio of the active group of the dispersant to imidazole is 1:2; heat the reaction system to 80 °C and react for 8 h under nitrogen protection; after the reaction is completed, remove the solvent by rotary evaporation to obtain the modified dispersant;

[0109] Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene composite, the modified dispersant, the positioning agent, and the third diluent to prepare a stable carbon nanotube / graphene conductive paste;

[0110] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, blend carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, additive, first diluent and matting powder to prepare Component A; wherein, in Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800 W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, grind the blended mixture for 1 hour until the fineness of the blade is controlled within 25 µm to obtain Component A;

[0111] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain a conductive coating with high storage stability.

[0112] Example 3

[0113] This example provides a conductive coating and a preparation method thereof. The conductive coating is composed of the following components in parts by weight:

[0114] Component A: 38 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 2 parts of iron red, 0.5 part of phthalocyanine blue, 3.45 parts of carbon nanotube / graphene conductive paste, 2 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-6026F, 1.5 parts of leveling agent BYK-361N, 2 parts of drier dibutyltin dilaurate, 14.55 parts of first diluent (1.5 parts of cyclohexanone, 15 parts of xylene)

[0115] Component B: 10 parts of isocyanate curing agent N3390,

[0116] Component C: 23 parts of second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 23 parts of xylene, 3 parts of butyl acetate, 5 parts of phthalate).

[0117] The carbon nanotube / graphene conductive paste is composed of the following components: 0.15 part of graphene, 0.1 part of carbon nanotube, 0.3 part of modified polymer type dispersant Anti-Terra-203, 0.4 part of positioning agent cellulose acetate butyrate, 2.5 parts of third diluent (0.8 part of cyclohexanone, 2.5 parts of butyl acetate, 1 part of phthalate); wherein, graphene and carbon nanotube are mixed in a weight ratio of 3:2.

[0118] The mass ratio of Component A to Component B is 100:10.

[0119] Step 1: dissolve the dispersant completely with tetrahydrofuran, add imidazole and stir until completely dissolved, wherein the molar ratio of the active group of the dispersant to the imidazole is 1:1; heat the reaction system to 70°C and react for 8 hours under nitrogen protection; after the reaction is completed, remove the solvent by rotary evaporation to obtain a modified dispersant;

[0120] Under ultrasonic dispersion and high-speed stirring conditions, the carbon nanotube / graphene composite, the modified dispersant, the positioning agent, and the third diluent are blended to prepare a stable carbon nanotube / graphene conductive slurry;

[0121] Step 2: Under ultrasonic dispersion and high-speed stirring conditions, carbon nanotube / graphene conductive slurry, fluorocarbon resin, filler, pigment, additive, matting powder and the first diluent are blended to prepare component A; wherein, in step 1 and step 2, ultrasonic dispersion is performed using an ultrasonic disperser, and the power of the ultrasonic disperser is 800W; ultrasonic dispersion is performed for 30 minutes, and the temperature is controlled within 30°C during the entire ultrasonic dispersion process, and the speed of high-speed stirring is controlled at 1200 rad / min; in step 2, the blended mixture is ground for 1.5 hours until the scraper fineness is controlled within 25µm, to obtain component A;

[0122] Step 3: Add the isocyanate curing agent of component B and the second diluent of component C to component A and stir for half an hour to obtain a conductive coating with high storage stability.

[0123] The conductive coatings prepared in Examples 1-3 of the present application can also have good conductivity (i.e., surface resistance ≤ 10 6 Ω / sq), three-proof properties, and excellent bonding with substrates and matching primers.

[0124] Comparative Example 1

[0125] The difference from Example 1 is that single graphene is used to replace the carbon nanotube / graphene conductive paste.

[0126] Comparative Example 2

[0127] The difference from Example 1 is that a single carbon nanotube is used to replace the carbon nanotube / graphene conductive paste.

[0128] Comparative Example 3

[0129] This comparative example provides a conductive coating and a preparation method thereof, wherein the conductive coating is composed of the following components in parts by weight:

[0130] Component A: 38 parts of fluorocarbon resin JF-2X, 11 parts of talcum powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 1 part of carbon black, 4.5 parts of carbon nanotube / graphene conductive paste, 2 parts of matting agent ED-30, 2 parts of adhesion promoter EDL-809, 1.5 parts of leveling agent BYK-358, 2 parts of drier dibutyltin dilaurate diluted with 1%wt xylene, 16 parts of the first diluent (1.5 parts of cyclohexanone, 15 parts of xylene),

[0131] Component B: 10 parts of isocyanate curing agent HT-90B,

[0132] Component C: 23 parts of the second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 22 parts of xylene, 2.3 parts of butyl acetate, 4 parts of phthalate).

[0133] The carbon nanotube / graphene conductive paste is composed of the following components: 0.3 parts of graphene, 0.2 parts of carbon nanotubes, 0.5 parts of modified polymer type dispersant BYK161, 0.5 parts of positioning agent cellulose acetate butyrate, 3 parts of the third diluent (0.5 parts of cyclohexanone, 2 parts of butyl acetate, 1 part of phthalate), and graphene and carbon nanotubes are mixed in a weight ratio of 3:2.

[0134] The mass ratio of Component A to Component B is 100:10.

[0135] The preparation of the conductive coating includes the following steps:

[0136] Step 1: Blend the carbon nanotube / graphene composite, modified dispersant, positioning agent, and the third diluent to prepare a stable carbon nanotube / graphene conductive paste; among them, the modification step of the dispersant is the same as that in Example 1;

[0137] Step 2: Blend the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, auxiliary agent, matting agent, and the first diluent to prepare Component A, and grind the blended mixture for 1 hour until the scraping fineness is controlled within 25 µm to obtain Component A;

[0138] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain the conductive coating.

[0139] Comparative Example 4

[0140] This comparative example provides a conductive coating and its preparation method. The conductive coating is composed of the following components in parts by weight:

[0141] Component A: 40 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 4 parts of light calcium carbonate, 10 parts of titanium dioxide, 2 parts of medium chrome yellow 103, 6.7 parts of carbon nanotube / graphene conductive paste, 1.5 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-809, 1.5 parts of leveling agent L-1984N, 2 parts of drier dibutyltin dilaurate diluted with 1%wt xylene, 13.3 parts of first diluent (1.1 parts of cyclohexanone, 13 parts of xylene)

[0142] Component B: 10 parts of isocyanate curing agent N3390

[0143] Component C: 23 parts of second diluent (1 part of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 25 parts of xylene, 3 parts of butyl acetate, 6 parts of phthalate ester).

[0144] The carbon nanotube / graphene conductive paste consists of the following components: 0.6 parts of graphene, 0.6 parts of carbon nanotubes, 0.8 parts of modified polymer type dispersant BYK161, 0.7 parts of positioning agent cellulose acetate butyrate, 4 parts of third diluent (0.5 parts of cyclohexanone, 2 parts of butyl acetate, 1 part of phthalate ester), and graphene and carbon nanotubes are mixed in a weight ratio of 1:1.

[0145] The mass ratio of Component A to Component B is 100:10.

[0146] The preparation of the conductive coating includes the following steps:

[0147] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, the carbon nanotube / graphene composite, modified dispersant, positioning agent, and third diluent are blended to prepare a stable carbon nanotube / graphene conductive paste; among them, the modification step of the dispersant is the same as that in Example 2;

[0148] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, additive, matting powder, and first diluent are blended to prepare Component A; among them, in Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, the blended mixture is ground for 1.5 hours until the fineness of the drawdown bar is controlled within 25 µm;

[0149] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain a conductive coating with high storage stability.

[0150] Comparative Example 5

[0151] This comparative example provides a conductive coating and a preparation method thereof. The conductive coating is composed of the following components in parts by weight:

[0152] Component A: 40 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 4 parts of light calcium carbonate, 10 parts of titanium dioxide, 2 parts of medium chrome yellow 103, 6.5 parts of carbon nanotube / graphene conductive paste, 1.5 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-809, 1.5 parts of leveling agent L-1984N, 2 parts of drier dibutyltin dilaurate diluted with 1%wt xylene, 13.5 parts of first diluent (1.1 parts of cyclohexanone, 13 parts of xylene)

[0153] Component B: 10 parts of isocyanate curing agent N3390

[0154] Component C: 23 parts of second diluent (1 part of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 25 parts of xylene, 3 parts of butyl acetate, 6 parts of phthalate)

[0155] The carbon nanotube / graphene conductive paste is composed of the following components: 0.4 part of graphene, 0.6 part of carbon nanotube, 0.8 part of modified polymer type dispersant BYK161, 0.7 part of positioning agent cellulose acetate butyrate, 4 parts of third diluent (0.5 part of cyclohexanone, 2 parts of butyl acetate, 1 part of phthalate). Graphene and carbon nanotube are mixed in a weight ratio of 2:3.

[0156] The mass ratio of Component A to Component B is 100:10.

[0157] The preparation of the conductive coating includes the following steps:

[0158] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, carbon nanotube / graphene composite, modified dispersant, positioning agent, and third diluent are blended to prepare a stable carbon nanotube / graphene conductive paste; among them, the modification step of the dispersant is the same as that in Example 2;

[0159] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, auxiliary agent, matting powder, and first diluent are blended to prepare Component A; among them, in Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30°C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, the blended mixture is ground for 1.5 hours until the scraping fineness is controlled within 25 µm;

[0160] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain the conductive coating.

[0161] Comparative Example 6

[0162] This comparative example provides a conductive coating and a preparation method thereof. The conductive coating is composed of the following components in parts by weight:

[0163] Component A: 40 parts of fluorocarbon resin JF-2X, 12 parts of talcum powder (1250 mesh), 5 parts of precipitated barium sulfate, 4 parts of light calcium carbonate, 10 parts of titanium dioxide, 2 parts of medium chrome yellow 103, 6.5 parts of carbon nanotube / graphene conductive paste, 1.5 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-809, 1.5 parts of leveling agent L-1984N, 2 parts of drier 1%wt dibutyltin dilaurate diluted with xylene, 13.5 parts of first diluent (1.1 parts of cyclohexanone, 13 parts of xylene)

[0164] Component B: 10 parts of isocyanate curing agent N3390

[0165] Component C: 23 parts of second diluent (1 part of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 25 parts of xylene, 3 parts of butyl acetate, 6 parts of phthalate)

[0166] The carbon nanotube / graphene conductive paste is composed of the following components: 0.6 part of graphene, 0.4 part of carbon nanotube, 0.8 part of modified amine salt ionic dispersant sn-5027, 0.7 part of positioning agent cellulose acetate butyrate, 3 parts of third diluent (0.5 part of cyclohexanone, 2 parts of butyl acetate, 1 part of phthalate), and graphene and carbon nanotube are mixed in a weight ratio of 3:2.

[0167] The mass ratio of Component A to Component B is 100:10.

[0168] The preparation of the conductive coating includes the following steps:

[0169] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene composite, modified dispersant, positioning agent, and third diluent to prepare a stable carbon nanotube / graphene conductive paste; among them, the modification step of the dispersant is the same as that in Example 2.

[0170] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, blend carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, additive, flatting agent, and the first diluent to prepare Component A; wherein, in Steps 1 and 2, ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800 W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, grind the blended mixture for 1.5 hours until the fineness of the drawdown bar is controlled within 25 µm.

[0171] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain the conductive coating.

[0172] Comparative Example 7

[0173] The present invention provides a conductive coating and a preparation method thereof, which are composed of the following components in parts by weight:

[0174] Component A: 38 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 2 parts of iron red, 0.5 part of phthalocyanine blue, 3.45 parts of conductive paste, 2 parts of flatting agent ED-30, 2 parts of adhesion promoter EDL-6026F, 1.5 parts of flow leveling agent BYK-361N, 2 parts of drier dibutyltin dilaurate, 14.55 parts of the first diluent (1.5 parts of cyclohexanone, 15 parts of xylene)

[0175] Component B: 10 parts of isocyanate curing agent N3390

[0176] Component C: 23 parts of the second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 23 parts of xylene, 3 parts of butyl acetate, 5 parts of phthalate)

[0177] The conductive paste is composed of the following components: 0.25 part of nano antimony-doped tin dioxide, 0.3 part of modified polymer type dispersant Anti-Terra-203, 0.4 part of positioning agent cellulose acetate butyrate, 2.5 parts of the third diluent (0.8 part of cyclohexanone, 2.5 parts of butyl acetate, 1 part of phthalate).

[0178] The preparation of the conductive coating includes the following steps:

[0179] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, blend nano antimony-doped tin dioxide, modified dispersant, positioning agent, fluorocarbon resin, filler, pigment, auxiliary agent, matting powder and the first diluent to prepare Component A; among them, the modification step of the dispersant is the same as that in Example 3; ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800 W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, the rotation speed of high-speed stirring is controlled at 1200 rad / min, grind the blended mixture for 1.5 hours, and control the fineness of the scraping blade within 25 µm;

[0180] Step 2: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain the conductive coating.

[0181] Comparative Example 8

[0182] This comparative example provides a conductive coating and a preparation method thereof. The conductive coating is composed of the following components in parts by weight:

[0183] Component A: 38 parts of fluorocarbon resin JF-2X, 12 parts of talcum powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 2 parts of iron red, 0.5 part of phthalocyanine blue, 3.45 parts of carbon nanotube / graphene conductive paste, 2 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-6026F, 1.5 parts of leveling agent BYK-361N, 2 parts of drier dibutyltin dilaurate, 14.55 parts of the first diluent (1.5 parts of cyclohexanone, 15 parts of xylene)

[0184] Component B: 10 parts of isocyanate curing agent N3390,

[0185] Component C: 23 parts of the second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 23 parts of xylene, 3 parts of butyl acetate, 5 parts of phthalate).

[0186] The carbon nanotube / graphene conductive paste is composed of the following components: 0.15 part of graphene, 0.1 part of carbon nanotube, 0.3 part of modified controlled radical type dispersant DISUPER S9100, 0.4 part of positioning agent cellulose acetate butyrate, 2.5 parts of the third diluent (0.8 part of cyclohexanone, 2.5 parts of butyl acetate, 1 part of phthalate); among them, graphene and carbon nanotube are mixed in a weight ratio of 3:2.

[0187] The mass ratio of Component A to Component B is 100:10.

[0188] The preparation of the conductive coating includes the following steps:

[0189] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene composite, modified dispersant, positioning agent, and third diluent to prepare a stable carbon nanotube / graphene conductive paste; among them, the modification step of the dispersant is the same as that in Example 3;

[0190] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, auxiliary agent, matting powder, and first diluent to prepare a stable Component A; among them, in Steps 1 and 2, ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800 W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, grind the blended mixture for 1 hour until the fineness of the drawdown bar is controlled within 25 µm;

[0191] Step 3: Add Component B isocyanate curing agent and Component C second diluent to Component A and stir for half an hour to obtain a conductive coating.

[0192] Comparative Example 9

[0193] This example provides a conductive coating and its preparation method. The conductive coating is composed of the following components in parts by weight:

[0194] Component A: 38 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 2 parts of iron oxide red, 0.5 part of phthalocyanine blue, 1.45 parts of carbon nanotube / graphene conductive paste, 2 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-6026F, 1.5 parts of leveling agent BYK-361N, 2 parts of drying catalyst dibutyltin dilaurate, 16.55 parts of first diluent (1.5 parts of cyclohexanone, 15 parts of xylene)

[0195] Component B: 10 parts of isocyanate curing agent N3390,

[0196] Component C: 23 parts of second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 23 parts of xylene, 3 parts of butyl acetate, 5 parts of phthalate ester).

[0197] The carbon nanotube / graphene conductive paste is composed of the following components: 0.15 part of graphene, 0.1 part of carbon nanotube, 0.3 part of modified polymer type dispersant Anti-Terra-203, 0.4 part of positioning agent cellulose acetate butyrate, 0.5 part of third diluent (0.8 part of cyclohexanone, 2.5 parts of butyl acetate, 1 part of phthalate ester); among them, graphene and carbon nanotube are mixed in a weight ratio of 3:2.

[0198] The mass ratio of the component A to the component B is 100:10.

[0199] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene composite, the modified dispersant, the positioning agent, and the third diluent to prepare a stable carbon nanotube / graphene conductive paste; wherein, the modification step of the dispersant is the same as that in Example 3.

[0200] Step 2: Under the conditions of ultrasonic dispersion and high-speed stirring, blend the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, additive, matting powder, and the first diluent to prepare the component A; wherein, in Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser, and the power of the ultrasonic disperser is 800 W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, and the rotation speed of high-speed stirring is controlled at 1200 rad / min; in Step 2, grind the blended mixture for 1.5 hours until the fineness of the scraping is controlled within 25 µm to obtain the component A.

[0201] Step 3: Add the component B isocyanate curing agent and the component C second diluent to the component A and stir for half an hour to obtain the conductive coating.

[0202] Comparative Example 10

[0203] This example provides a conductive coating and a preparation method thereof. The conductive coating is composed of the following components in parts by weight:

[0204] Component A: 38 parts of fluorocarbon resin JF-2X, 12 parts of talc powder (1250 mesh), 5 parts of precipitated barium sulfate, 3 parts of light calcium carbonate, 14 parts of titanium dioxide, 2 parts of iron red, 0.5 part of phthalocyanine blue, 0.15 part of graphene, 0.1 part of carbon nanotube, 2 parts of matting powder ED-30, 2 parts of adhesion promoter EDL-6026F, 1.5 parts of leveling agent BYK-361N, 2 parts of drying agent dibutyltin dilaurate, 17.75 parts of the first diluent (1.5 parts of cyclohexanone, 15 parts of xylene)

[0205] Component B: 10 parts of isocyanate curing agent N3390

[0206] Component C: 23 parts of the second diluent (1.5 parts of cyclohexanone, 2 parts of propylene glycol methyl ether acetate, 23 parts of xylene, 3 parts of butyl acetate, 5 parts of phthalate)

[0207] The mass ratio of the component A to the component B is 100:10.

[0208] Step 1: Under the conditions of ultrasonic dispersion and high-speed stirring, carbon nanotubes, graphene, fluorocarbon resin, filler, pigment, additive, matting powder and the first diluent are blended to prepare Component A; among them, ultrasonic dispersion is carried out by an ultrasonic disperser, and the power of the ultrasonic disperser is 800 W; ultrasonic dispersion is carried out for 30 min, and the temperature is controlled within 30 °C during the whole ultrasonic dispersion process, the rotation speed of high-speed stirring is controlled at 1200 rad / min, and the blended mixture is ground for 1.5 hours until the fineness of the scraping plate is controlled within 25 µm to obtain Component A;

[0209] Step 2: Component B isocyanate curing agent and Component C second diluent are added to Component A and stirred for half an hour to obtain the conductive coating.

[0210] Testing

[0211] (1) The conductive coatings prepared in Examples 1-3 and Comparative Examples 1-10 are detected, and the detection standards are shown in Table 1, and the detection results are shown in Table 2.

[0212] Table 1

[0213]

[0214] Table 2

[0215]

[0216] (2) In Example 2, Comparative Example 6 and Comparative Example 8, modified polymer type dispersant, modified amine salt type ionic dispersant and modified controlled free radical type dispersant are respectively used to prepare carbon nanotube / graphene conductive paste. After dispersion by ultrasonic and high-speed stirring processes, the dispersion degree of the conductive powder in the system and the stability of the dispersion liquid are tested to evaluate the dispersion effects of different dispersants. The experimental results are shown in Table 3 and Figure 1-2 。

[0217] Table 3 Test Results of Dispersant Applicability

[0218]

[0219] According to Table 3 and Figure 1-2 it can be seen that in the experimental group using the modified polymer type dispersant, the degree of particle flocculation in the paint slurry is the smallest after 30 days of thermal storage, the dispersion effect is the best, and the storage stability is better than the other two groups.

[0220] Conclusion:

[0221] Compared with Example 1 and Comparative Example 1, the difference in the coating is that carbon nanotubes are not added in Comparative Example 1. Compared with Example 1 and Comparative Example 1, the surface resistance of the carbon nanotube / graphene composite is much lower than that of graphene used alone.

[0222] When comparing Example 1 with Comparative Example 2, the difference in the coating is that graphene is not added in Comparative Example 2. When comparing Example 1 with Comparative Example 2, the surface resistance value of Example 1 is much lower than that of Comparative Example 2.

[0223] When comparing Example 1 with Comparative Example 3, the difference in the coating is that ultrasonic waves and high-speed stirring are not used to disperse carbon nanotubes / graphene in advance in Comparative Example 3. When comparing Example 1 with Comparative Example 3, dispersing carbon nanotubes / graphene in advance can reduce the surface resistance of the coating, improve the overall performance of the coating, and affect the storage stability of the coating.

[0224] When comparing Example 2 with Comparative Example 4, the difference in the coating is that the ratio of carbon nanotubes / graphene in Comparative Example 4 is changed to 1:1. When comparing Example 2 with Comparative Example 5, the difference in the coating is that the ratio of carbon nanotubes / graphene in Comparative Example 5 is changed to 3:2. When comparing Comparative Examples 4 and 5 with Example 2, the change in the addition ratio of graphene and carbon nanotubes has an impact on the conductivity of the coating.

[0225] When comparing Example 2 with Comparative Example 6, the difference in the coating is that the modified polymeric dispersant Anti-Terra-203 in Comparative Example 6 is replaced with the modified amine salt ionic dispersant sn-5027. When comparing Example 2 with Comparative Example 6, the dispersion effect of using sn-5027 is poor, resulting in a high surface resistance, an increase in the average particle size after 30 days of heat storage, and poor storage stability of the coating.

[0226] When comparing Example 3 with Comparative Example 7, carbon nanotubes / graphene are not added in Comparative Example 7 and are replaced with nano-antimony-doped tin dioxide. When comparing Example 3 with Comparative Example 7, the coating prepared in Comparative Example 7 improves the adhesion of the system, but the pull-off adhesion cannot meet the requirement of 15 MPa.

[0227] When comparing Example 3 with Comparative Example 8, the modified polymeric dispersant in Comparative Example 8 is replaced with the modified controlled radical dispersant DISUPER S9100. When comparing Example 3 with Comparative Example 8, the dispersion effect becomes worse after replacement, the surface resistance value increases, and the storage stability of the coating is poor.

[0228] When comparing Example 3 with Comparative Example 9, the content of the carbon nanotubes / graphene composite in Comparative Example 9 is not within the range of 7-16%. The content of graphene and carbon nanotubes in the slurry system is too high, the viscosity of the slurry is too high, and the interaction between the fluorocarbon resin and the carbon nanotubes / graphene is greatly weakened, which is not conducive to dispersion grinding and storage, and will also affect the surface resistance value of the coating.

[0229] When comparing Example 3 with Comparative Example 10, carbon nanotubes and graphene are directly added to Component A in Comparative Example 10 without being prepared into a conductive slurry. When compared with Example 3, the surface resistance is relatively large, and the pull-off method also cannot meet the requirement of 15 MPa.

[0230] The above has provided a detailed introduction to a highly storage-stable conductive coating and its preparation method provided by this application. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to this application, and these improvements and modifications also fall within the protection scope of this application.

[0231] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as a limitation to this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A conductive coating, characterized in that, The conductive coating is composed of component A, component B and component C. By weight, component A is 100 parts, component B is 8 - 12 parts, and component C is 10 - 25 parts; Among them, by weight, component A includes: 20 - 45 parts of fluorocarbon resin, 10 - 30 parts of filler, 5 - 17 parts of pigment, 3 - 7 parts of carbon nanotube / graphene conductive paste, 2 - 6 parts of auxiliary agent, 10 - 20 parts of the first diluent, and 1 - 2 parts of flatting agent; Component B: 8 - 12 parts of curing agent, Component C: 10 - 25 parts of the second diluent, Among them, the carbon nanotube / graphene conductive paste, by weight, is composed of the following components: 0.15 - 0.6 parts of graphene, 0.1 - 0.6 parts of carbon nanotubes, 0.4 - 0.7 parts of positioning agent, 0.3 - 0.8 parts of modified dispersant, and 2.5 - 4 parts of the third diluent. Among them, the weight ratio of graphene to carbon nanotubes is 3:2; In the carbon nanotube / graphene conductive paste, the weight ratio of the carbon nanotube / graphene composite in the carbon nanotube / graphene conductive paste is 7 - 16%; The positioning agent is a cellulose ester - type positioning agent; The modified dispersant is a polymer - type dispersant modified by a modified compound; The polymer - type dispersant is BYK161 or Anti - Terra - 203; The modified compound is imidazole or polyethylene glycol; The molar ratio of the active group of the dispersant to the modified compound is 1:1 to 1:2; The preparation method of the conductive coating includes the following steps: Step 1: Under the conditions of ultrasonic dispersion and high - speed stirring, blend the carbon nanotube / graphene composite, modified dispersant, positioning agent, and the third diluent to prepare the carbon nanotube / graphene conductive paste; Step 2: Under the conditions of ultrasonic dispersion and high - speed stirring, blend the carbon nanotube / graphene conductive paste, fluorocarbon resin, filler, pigment, auxiliary agent, the first diluent, and flatting agent, and grind the blended mixture to obtain component A; Step 3: Add the curing agent of component B and the second diluent of component C to component A and stir to obtain the conductive coating; Step 1 also includes the modification treatment of the dispersant: Dissolve the dispersant with a solvent, add the modified compound and stir until completely dissolved; Heat the reaction system and react under nitrogen protection; After the reaction is completed, remove the solvent to obtain the modified dispersant. Among them, the solvent is tetrahydrofuran; The heating temperature is 60 - 80 °C; The reaction time is 6 - 10 h.

2. The electrically conductive coating according to claim 1, wherein, The positioning agent is cellulose acetate butyrate.

3. The electrically conductive coating according to any one of claims 1 to 2, characterized in that The fluorocarbon resin is vinylidene chloride - vinyl ester resin; The filler is an inorganic filler, selected from at least one of talc powder, precipitated barium sulfate, and light calcium carbonate; The pigment is at least one of organic pigments and inorganic pigments; The auxiliary agent is at least one of a leveling agent, a drying agent, and an adhesion promoter; 4. The electrically conductive coating according to any one of claims 1 to 2, characterized in that, The curing agent is isocyanate; 5. The electrically conductive paint according to claim 4, wherein The curing agent is an aliphatic polyisocyanate; 6. The electrically conductive coating according to claim 5, wherein, The curing agent is hexamethylene diisocyanate.

7. The electrically conductive coating according to any one of claims 1 to 2, characterized in that The first diluent, the second diluent, and the third diluent each include at least one of cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, and dibasic acid ester; The compositions of the first diluent, the second diluent, and the third diluent are the same or different.

8. The electrically conductive coating according to any one of claims 1 to 2, characterized in that, In Step 1 and Step 2, ultrasonic dispersion is carried out using an ultrasonic disperser; The power of the ultrasonic disperser is 800 W; The time for ultrasonic dispersion is 5 - 30 min; During the ultrasonic dispersion process, the slurry temperature does not exceed 30 °C; The rotation speed for high-speed stirring is 1000 rad / min - 1200 rad / min; The time for high-speed stirring is 1 - 3 h.

9. The electrically conductive coating according to any one of claims 1 to 2, characterized in that, In Step 2, the blended mixture is ground until the fineness is controlled within 25 µm; The grinding time is 1 - 2 h.

10. The electrically conductive coating according to any one of claims 1 to 2, characterized in that In Step 3, the stirring time is 0.2 - 1 h.

11. The electrically conductive coating according to claim 10, wherein The stirring time is 0.5 h.

12. Application of the conductive coating according to any one of claims 1 to 11 on the surface of an aircraft; the conductive coating is used as a primer or a topcoat.

13. A coating formed by the conductive coating according to any one of claims 1 to 11, the coating being formed by coating the conductive coating onto a substrate and curing.

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