Anti-static corrosion-resistant epoxy coating and preparation method thereof

Abstract

The invention belongs to the technical field of epoxy resin coatings, and particularly relates to a novel anti-static corrosion-resistant epoxy coating and a preparation method thereof. The preparation method comprises the following steps: performing amination modification on graphene oxide through p-phenylenediamine, performing in-situ growth of a corrosion inhibitor-loaded graphene-polyaniline microcapsule by taking amido as a binding site, blending the corrosion inhibitor-loaded graphene-polyaniline microcapsule with a carbon nanotube, and adding the mixture into an epoxy coating to construct an antistatic-corrosion-resistant integrated functional coating. The polyaniline capsule is used as an intercalator, so that the interlamellar spacing of the graphene can be increased, the aggregation is reduced, and the dispersity is optimized. Meanwhile, the graphene sheet layer of the two-dimensional structure forms a labyrinth effect, the diffusion path of a corrosive medium is prolonged, and the physical shielding property of the coating is enhanced. In addition, after the corrosion inhibitor is loaded on the core-shell structure of the polyaniline capsule, the corrosion inhibitor can be released under the stimulation of positive ions, and the coating is endowed with an active defense function. And the polyaniline capsules are conductive and are in lap joint with the graphene and the carbon nanotubes to form a three-dimensional conductive network, so that the coating has an anti-static function.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of epoxy coating and specifically relates to an anti-static corrosion-resistant epoxy coating and a preparation method. BACKGROUND

[0002] In recent years, relevant researches have introduced conductive fillers (metallic, carbon, organic conductive polymer, etc.) to conductively modify epoxy resin. This modification not only retains the original strong adhesion and corrosion resistance of epoxy resin, but also endows the coating with anti-static function, which can meet the demand of emerging scenarios such as flexible circuit board, lithium battery shell and 5G equipment for material anti-static and protection integration. At present, although anti-static coatings using gold, silver, copper and other materials as conductive fillers have been developed at home and abroad, their application is limited by the high cost of gold and silver and the low chemical stability of copper. Although carbon fillers such as carbon black and graphite have the advantages of high chemical stability, wide application and low price, the traditional carbon conductive coating made of them has certain limitations in conductive performance. Carbon nanotubes are suitable for use as conductive fillers for anti-static coating because of their excellent conductivity, nanoscale size and high aspect ratio, which are conducive to the formation of an electronic transmission network. However, the addition of carbon nanotubes can only slightly enhance the shielding effect of the coating on the external corrosive environment. Therefore, the coating also needs to be endowed with an "active" defense function against corrosive media to significantly improve the protective ability of the coating.

[0003] Polyaniline has become an ideal nanoscale anti-corrosion conductive filler in organic coatings due to its easy synthesis, unique doping characteristics and good environmental stability. For example, Chinese invention patent CN202110767459.4 discloses "a salt-responsive polyaniline microcapsule, a self-warning coating and a preparation method", which uses polyaniline capsules loaded with fluorescent small molecules to endow the coating with a self-warning function. When the coating is damaged, salt ions in the corrosive medium will induce the polyaniline capsules to release the internal fluorescent molecules, thereby visualizing the initial stage of corrosion. Chinese invention patent CN119799117A discloses "a carbon nanotube / polyaniline composite modified epoxy resin conductive coating and a preparation method thereof", which has more excellent mechanical properties than traditional conductive coatings and can be better applied in aerospace, batteries, communications and new energy. However, there is no report on the use of polyaniline nanocapsules with cationic response in combination with graphene two-dimensional materials with high physical barrier properties and carbon nanotube one-dimensional conductive materials to endow the epoxy coating with conductivity and anti-static ability. SUMMARY

[0004] In order to overcome the deficiency that the existing epoxy coating is difficult to have both conductivity and anti-static ability, the application provides an anti-static and corrosion-resistant epoxy coating and a preparation method, and the epoxy coating is prepared by doping carbon nanotubes and graphene-polyaniline capsule filler loaded with corrosion inhibitor, so that the coating has anti-static ability and prolongs the service life of the coating independently.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the application is:

[0006] The first aspect of the application provides a preparation method of an anti-static and corrosion-resistant epoxy coating, which comprises the following steps:

[0007] S1, dissolve graphene oxide and p-phenylenediamine in ethanol, collect the precipitate after condensation reflux and centrifugation, and then wash and dry to obtain p-phenylenediamine modified graphene;

[0008] S2, dissolve aniline liquid in toluene to prepare A liquid, dissolve p-phenylenediamine modified graphene and corrosion inhibitor in water to prepare B liquid, then add A liquid to B liquid, stir under ice water condition to prepare A-B liquid; then dissolve ammonium persulfate in hydrochloric acid and add it to A-B liquid, continue to cool and stir, collect the precipitate by centrifugation, and then wash and dry to obtain graphene-polyaniline microcapsule;

[0009] S3, mix carbon nanotubes and graphene-polyaniline microcapsule of step S2 to prepare a mixed conductive filler, then add it to epoxy resin, uniformly disperse, coat, dry and cure to obtain an anti-static and corrosion-resistant epoxy composite coating.

[0010] The application first modifies the graphene oxide by p-phenylenediamine, then in-situ grows graphene-polyaniline microcapsule loaded with corrosion inhibitor by taking amine group as a combination site, and then adds it to the epoxy coating together with carbon nanotubes to construct a functional coating integrating anti-static and corrosion resistance. On the one hand, the polyaniline capsule can increase the distance between graphene layers and reduce the aggregation between layers as an intercalating agent. At the same time, the graphene layers with two-dimensional structure distributed in the coating can form a “labyrinth effect”, prolong the diffusion path of corrosive medium and enhance the physical barrier performance of the coating. On the other hand, the polyaniline capsule has a core-shell structure, and after loading the corrosion inhibitor, it can release the internal corrosion inhibitor under the stimulation of cations, thereby giving the coating an “active defense” function against corrosive medium. In addition, the polyaniline capsule also has conductivity, and after being anchored on the graphene layer, it can be connected with the carbon nanotubes in the coating to form a three-dimensional conductive network, thereby giving the coating an anti-static function.

[0011] Preferably, in S1, the mass-volume ratio of the graphene oxide, p-phenylenediamine and ethanol is 1-2 g: 1-2 g: 10-40 mL.

[0012] Preferably, in S1, the condensation reflux is 60-80℃ condensation reflux for 10-15h.

[0013] Preferably, in S2, the corrosion inhibitor is selected from at least one of 8-hydroxyquinoline, sodium dodecyl sulfate, and sodium dodecyl benzene sulfonate.

[0014] Preferably, in S2, the mass-volume ratio of the aniline liquid to toluene is 0.7-1.0g:80-160mL.

[0015] Preferably, in S2, the mass-volume ratio of the p-phenylenediamine modified graphene, the corrosion inhibitor, and water is 0.2-0.5g:0.2-0.5g:50-250mL.

[0016] Preferably, in S2, the hydrochloric acid is 1-2mol / L hydrochloric acid, and the mass-volume ratio of the ammonium persulfate to hydrochloric acid is 2-3g:20-50mL.

[0017] Preferably, in S2, the mass ratio of the aniline liquid, the p-phenylenediamine modified graphene, the corrosion inhibitor, and the ammonium persulfate is 0.7-1.0:0.2-0.5:0.2-0.5:2-3.

[0018] Preferably, in S3, the mass ratio of the carbon nanotube to the graphene-polyaniline capsule is 1-4:1.

[0019] Preferably, in S3, the mass ratio of the mixed conductive filler to the epoxy resin is 0.2-5:100.

[0020] Preferably, in S3, the curing temperature is 40-60℃, and the time is 8-15h.

[0021] Preferably, the coating method comprises dip coating and spin coating.

[0022] The second aspect of the present application provides an anti-static corrosion-resistant epoxy coating prepared by the preparation method of the first aspect, wherein the thickness of the epoxy coating is 100-250μm.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The present application discloses an anti-static corrosion-resistant epoxy coating and a preparation method, wherein amine groups are grafted onto the surface of graphene oxide by p-phenylenediamine, then the graphene-polyaniline microcapsule loaded with corrosion inhibitors is synthesized by in-situ polymerization, and then the graphene-polyaniline microcapsule is compounded with carbon nanotubes as functional fillers and added to the epoxy coating. In this way, not only the anti-static function of the coating can be realized, but also excellent physical shielding ability and active protection ability can be given to the coating. Specifically, the present application has the following advantages:

[0025] (1) The main effective component of the anti-static and corrosion-resistant epoxy coating provided by the application is the carbon nanotube, graphene-polyaniline capsule and the corrosion inhibitor loaded therein. The graphene-polyaniline capsule has cationic stimulus response characteristics, and can quickly release the loaded corrosion inhibitor when contacting cations in the corrosion medium or magnesium ions generated by the magnesium alloy substrate, thereby hindering the progress of corrosion. In addition, the graphene-polyaniline capsule can form a three-dimensional conductive network with the carbon nanotube in the coating, thereby imparting the coating with anti-static properties.

[0026] (2) The graphene-polyaniline capsule can not only avoid the problems of destroying the overall structure of the coating and excessive loss of the corrosion inhibitor due to incompatibility between the corrosion inhibitor and the coating, but also reduce the phenomenon of easy aggregation between graphene layers.

[0027] (3) The method for preparing the graphene-polyaniline capsule has simple synthesis steps and high corrosion inhibitor loading capacity. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 TEM images of graphene and graphene-polyaniline capsules; (a) and (b) are TEM images of graphene nanosheets and graphene nanosheets loaded with polyaniline capsules, respectively.

[0029] Figure 2 Release curves of graphene-polyaniline capsules loaded with corrosion inhibitors under stimulation of different types of cations.

[0030] Figure 3 Electrochemical impedance spectrogram of the coating immersed in a 3.5wt% NaCl solution.

[0031] Figure 4 Volume resistivity test results of the coating. DETAILED DESCRIPTION

[0032] The specific embodiments of the application are further described below. It should be noted that the description of these embodiments is used to help understand the application, but does not constitute a limitation on the application. In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as there is no conflict.

[0033] In the following examples and comparative examples, the epoxy resin used was provided by Guangzhou Zhonggao Chemical Industry Co., Ltd., and other chemical reagents were provided by National Pharmaceutical Chemical Reagent Co., Ltd., with a purity of analytical grade. Unless otherwise specified, the experimental methods involved were conventional methods.

[0034] Example 1: Preparation, characterization of graphene-polyaniline capsules and their response release curves under stimulation of different cations

[0035] (1) In a round-bottom flask, 2 g of graphene oxide and 2 g of p-phenylenediamine were dissolved in 30 mL of anhydrous ethanol, and the round-bottom flask was placed in an oil bath at 70°C for 12 h of condensation reflux, followed by centrifugal collection of the precipitate, which was dried to obtain p-phenylenediamine-modified graphene. Then, 0.8 g of aniline liquid was dissolved in 100 mL of toluene, denoted as liquid A, 0.3 g of the prepared p-phenylenediamine-modified graphene and 0.3 g of 8-hydroxyquinoline were dissolved in 100 mL of distilled water, denoted as liquid B, and then liquid A was slowly added to liquid B and stirred in an ice bath for 12 h, denoted as liquid A-B; then, 2.28 g of ammonium persulfate was dissolved in 30 mL of 1 mol / L hydrochloric acid, and the solution was slowly added dropwise to liquid A-B using a separatory funnel, and the mixture was kept under cooling and stirring for 6 h; the precipitate was collected by centrifugation, and then distilled water was added and centrifuged for 3 times, followed by drying at 60°C to obtain graphene-polyaniline capsules.

[0036] (2) The graphene and graphene-polyaniline capsules in step (1) were respectively dissolved in anhydrous ethanol at a weight ratio of 1:10000-100000, and then ultrasonically dispersed for half an hour, and then a small amount of the liquid was added dropwise onto a copper mesh, which was dried and then placed under a transmission electron microscope (TEM) for characterization test. The TEM images of the obtained graphene and graphene-polyaniline capsules are shown in FIGS. 1(a) and (b), and it can be seen that the graphene has a sheet structure, and the polyaniline capsules are uniformly distributed on the graphene sheet structure.

[0037] (3) The graphene-polyaniline capsules in step (1) were dispersed in different valence and type of cation solutions (NaCl, KCl, MgCl2, CaCl2, or AlCl3 solution; concentration 0.01 mol / L) at a concentration of 0.2 g / L, and then poured into a dialysis bag (molecular weight cut-off 500 Da), and then the dialysis bag was immersed in the same concentration of cation solution to perform dialysis treatment. Every certain time, 2 mL of dialysate was taken out, and the concentration of corrosion inhibitor in the dialysate was determined by ultraviolet-visible spectrophotometry, and a release curve graph as shown in FIG. 2 was obtained. It can be seen that the graphene-polyaniline capsules respond to the stimulation of different types and valence of cations, among which the response to the stimulation of potassium ions is the strongest, and the response to the stimulation of calcium ions is the weakest. Figure 2

[0038] Example 2: Preparation of an antistatic and corrosion-resistant coating and test of its electrochemical and conductive properties

[0039] 1. Preparation of an antistatic and corrosion-resistant coating

[0040] 1.1. Preparation of coating 1

[0041] This example provides an antistatic and corrosion-resistant epoxy coating, and the preparation method thereof comprises the following steps:

[0042] ​(1) In a round bottom flask, 2 g of graphene oxide and 2 g of p-phenylenediamine were dissolved in 30 mL of anhydrous ethanol, the round bottom flask was placed in an oil bath at 70°C for 12 h of condensation reflux, then the precipitate was collected by centrifugation, and after drying, p-phenylenediamine modified graphene was obtained.

[0043] (2) 0.8 g of aniline liquid was dissolved in 100 mL of toluene, recorded as A liquid, 0.3 g of p-phenylenediamine modified graphene prepared in step (1), 0.3 g of 8-hydroxyquinoline was dissolved in 100 mL of distilled water, recorded as B liquid, then A liquid was slowly added to B liquid and stirred in ice bath condition for 12 h, recorded as A-B liquid; 2.28 g of ammonium persulfate was dissolved in 30 mL of 1 mol / L hydrochloric acid, then it was slowly added to A-B liquid using a separatory funnel, and kept cooling and stirring for 6 h; the mixed liquid was centrifuged to collect the precipitate, then distilled water was added and repeated centrifugation for 3 times, then dried at 60°C, and graphene-polyaniline capsules were obtained.

[0044] (3) Carbon nanotubes and graphene-polyaniline microcapsules prepared in step (2) were mixed in a mass ratio of 1:1 to prepare a mixed conductive filler, then the mixed conductive filler was added to the prepared epoxy resin in a mass fraction of 2%, and the conductive filler was uniformly dispersed in the epoxy resin by ultrasonic stirring for 1 h in ice bath condition. Finally, the epoxy composite resin was evenly coated using a coating rod, and was placed in a vacuum drying oven at 60°C for 12 h to obtain an antistatic corrosion-resistant epoxy composite coating with a thickness of 200 μm.

[0045] 1.2, Preparation of coating 2:

[0046] The embodiment provides an antistatic corrosion-resistant epoxy coating, and a preparation method thereof includes the following steps:

[0047] (1) In a round bottom flask, 2 g of graphene oxide and 2 g of p-phenylenediamine were dissolved in 30 mL of anhydrous ethanol, the round bottom flask was placed in an oil bath at 70°C for 12 h of condensation reflux, then the precipitate was collected by centrifugation, and after drying, p-phenylenediamine modified graphene was obtained.

[0048] (2) 0.8 g of aniline liquid was dissolved in 100 mL of toluene, recorded as A liquid, 0.3 g of p-phenylenediamine modified graphene prepared in step (1), 0.3 g of 8-hydroxyquinoline was dissolved in 100 mL of distilled water, recorded as B liquid, then A liquid was slowly added to B liquid and stirred in ice bath condition for 12 h, recorded as A-B liquid; 2.28 g of ammonium persulfate was dissolved in 30 mL of 1 mol / L hydrochloric acid, then it was slowly added to A-B liquid using a separatory funnel, and kept cooling and stirring for 6 h; the mixed liquid was centrifuged to collect the precipitate, then distilled water was added and repeated centrifugation for 3 times, then dried at 60°C, and graphene-polyaniline capsules were obtained.

[0049] (3) Carbon nanotubes and graphene-polyaniline microcapsules prepared in step (2) were mixed at a mass ratio of 2:1 to prepare a mixed conductive filler. Then, the mixed conductive filler was added to the prepared epoxy resin at a mass fraction of 2%, and ultrasonically stirred for 1 hour under ice bath conditions to ensure that the conductive filler was evenly dispersed in the epoxy resin. Finally, the epoxy composite resin was evenly coated with a coating rod and placed in a vacuum drying oven at 60°C for 12 hours to obtain an antistatic and corrosion-resistant epoxy composite coating with a thickness of 200 μm.

[0050] 1.3 Preparation of Coating 3:

[0051] This embodiment provides an antistatic and corrosion-resistant epoxy coating, the preparation method of which includes the following steps:

[0052] (1) Dissolve 2g of graphene oxide and 2g of p-phenylenediamine in 30mL of anhydrous ethanol in a round-bottom flask. Place the round-bottom flask in an oil bath at 70℃ for 12h of reflux and then centrifuge to collect the precipitate. After drying, p-phenylenediamine-modified graphene is obtained.

[0053] (2) Dissolve 0.8g of aniline liquid in 100mL of toluene and label it as solution A. Dissolve 0.3g of p-phenylenediamine-modified graphene prepared in step (1) and 0.3g of 8-hydroxyquinoline in 100mL of distilled water and label it as solution B. Then slowly add solution A to solution B and stir for 12h under ice bath conditions and label it as solution AB. Dissolve 2.28g of ammonium persulfate in 30mL of 1mol / L hydrochloric acid and slowly add it dropwise to solution AB using a separatory funnel. Keep the mixture cooled and stirred for 6h. After centrifuging the mixed liquid to collect the precipitate, add distilled water and repeat the centrifugation 3 times. Then dry it at 60℃ to obtain graphene-polyaniline capsules.

[0054] (3) Carbon nanotubes and graphene-polyaniline microcapsules prepared in step (2) were mixed at a mass ratio of 3:1 to prepare a mixed conductive filler. Then, the mixed conductive filler was added to the prepared epoxy resin at a mass fraction of 2%, and ultrasonically stirred for 1 hour under ice bath conditions to ensure that the conductive filler was evenly dispersed in the epoxy resin. Finally, the epoxy composite resin was evenly coated with a coating rod and placed in a vacuum drying oven at 60°C for 12 hours to obtain an antistatic and corrosion-resistant epoxy composite coating with a thickness of 200 μm.

[0055] 1.4 Preparation of Coating 4:

[0056] This embodiment provides an antistatic and corrosion-resistant epoxy coating, the preparation method of which includes the following steps:

[0057] (1) In a round bottom flask, 2 g of graphene oxide and 2 g of p-phenylenediamine were dissolved in 30 mL of anhydrous ethanol, and the round bottom flask was placed in an oil bath at 70°C for 12 h of condensation reflux, followed by centrifugal collection of the precipitate, and after drying, p-phenylenediamine modified graphene was obtained.

[0058] (2) 0.8 g of aniline liquid was dissolved in 100 mL of toluene, denoted as A liquid, 0.3 g of p-phenylenediamine modified graphene prepared in step (1), 0.3 g of 8-hydroxyquinoline was dissolved in 100 mL of distilled water, denoted as B liquid, then A liquid was slowly added to B liquid and stirred in an ice bath for 12 h, denoted as A-B liquid; 2.28 g of ammonium persulfate was dissolved in 30 mL of 1 mol / L hydrochloric acid, and then it was slowly added to A-B liquid using a separatory funnel, and kept cooling and stirring for 6 h; the precipitate was collected by centrifugation, and then distilled water was added and centrifuged for 3 times, and then dried at 60°C, to obtain graphene-polyaniline capsules.

[0059] (3) Carbon nanotubes were mixed with graphene-polyaniline microcapsules prepared in step (2) at a mass ratio of 4:1 to prepare a mixed conductive filler, and then the mixed conductive filler was added to the prepared epoxy resin at a mass fraction of 2%, and ultrasonic stirring was performed under ice bath conditions for 1 h to make the conductive filler uniformly dispersed in the epoxy resin. Finally, the epoxy composite resin was evenly coated using a coating rod, and was placed in a vacuum drying oven at 60°C for 12 h to obtain an antistatic corrosion-resistant epoxy composite coating with a thickness of 200 μm.

[0060] 1.5, Preparation of a pure epoxy coating (comparative example):

[0061] The comparative example used an initial epoxy coating, i.e., without adding any nanomaterial, and the coating was prepared directly using an epoxy resin purchased from the market: the epoxy resin was evenly coated using a coating rod, and was placed in a vacuum drying oven at 60°C for 12 h to obtain a pure epoxy coating with a thickness of 200 μm.

[0062] 2, Test of the electrochemical performance of the coating

[0063] All electrochemical tests were performed on AZ91D magnesium alloy coated with anti-static corrosion resistant coating. First, the surface of the magnesium alloy was polished using 200#, 400#, 600#, 800#, 1000# and 2000# sandpaper, and then the surface of the magnesium alloy was cleaned with distilled water and anhydrous ethanol in turn, and the residual ethanol on the surface was blown dry with cold air. Second, the surface of the magnesium alloy was treated by micro-arc oxidation, wherein the electrolyte composition was 10 g / L KOH and 10 g / L K3PO4, the fixed voltage of micro-arc oxidation was 300 V, the micro-arc oxidation time was 600 s, the current was 0.5 A, the frequency was 550 Hz, and the duty cycle was 50%. Finally, the coatings 1-4 and the pure epoxy coating were uniformly applied to the pretreated magnesium alloy surface using a coating rod, and were placed in a vacuum drying oven for curing at 60°C for 12 h to obtain the electrochemical test samples.

[0064] In this experiment, a standard three-electrode test device was used, and the magnesium alloy electrode coated with the coating, a platinum electrode and a saturated calomel electrode were used as the working electrode, the counter electrode and the reference electrode, respectively. Then, the electrochemical impedance test was performed under a potential fluctuation of 10 mV and a frequency range of 0.01-100000 Hz. The obtained electrochemical impedance spectrum is shown in Figure 3 It can be seen that, compared with the commercially available pure epoxy coating, the coatings 1-4 exhibit a larger capacitive arc diameter. Among them, the capacitive arc diameter of the coating 1 is about 2 orders of magnitude higher than that of the pure epoxy coating, indicating that the coating prepared by the method of the present application has excellent corrosion resistance.

[0065] 3. Test of the conductive performance of the coating

[0066] A constant current power supply was used to pass 3V direct current through the coatings 1-4, and a Keysight DAQ970A acquisition device was used to collect the current (I) and voltage (U), and then the resistance of the coating was calculated according to Ohm's law. The results are shown in Figure 4 It can be seen that the volume resistivity of all the coatings is less than 10 8 Ω·m. According to the provisions in GJB / Z86-97, all the coatings meet the requirements of anti-static.

[0067] The embodiments of the present application are described in detail above, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.

Claims

1. A method for preparing an anti-static corrosion resistant epoxy coating, characterized by, The method comprises the following steps: S1, dissolving graphene oxide and p-phenylenediamine in ethanol, collecting the precipitate after condensation reflux and centrifugation, and then washing and drying to obtain p-phenylenediamine modified graphene; S2, dissolving aniline liquid in toluene to prepare A liquid, dissolving p-phenylenediamine modified graphene and corrosion inhibitor in water to prepare B liquid, adding A liquid to B liquid, stirring under ice water condition to prepare A-B liquid, dissolving ammonium persulfate in hydrochloric acid, adding it to A-B liquid, and then collecting the precipitate after centrifugation, washing and drying to obtain graphene-polyaniline capsules; S3, mixing carbon nanotubes and graphene-polyaniline microcapsules of step S2 to prepare a mixed conductive filler, adding it to epoxy resin, uniformly dispersing, coating, drying and curing to obtain an anti-static and corrosion-resistant epoxy composite coating.

2. The method of claim 1, wherein the method is characterized by: In S1, the mass-volume ratio of graphene oxide, p-phenylenediamine and ethanol is 1-2g:1-2g:10-40mL.

3. The method of claim 1, wherein the method is characterized by: In S1, the condensation reflux is 60-80℃ for 10-15h.

4. The method of claim 1, wherein the method is characterized by: In S2, the corrosion inhibitor is at least one selected from 8-hydroxyquinoline, sodium dodecyl sulfate and sodium dodecylbenzenesulfonate.

5. The method of claim 1, wherein the method further comprises adding a corrosion inhibitor to the mixture of the epoxy resin, the curing agent, and the anti-static agent. In S2, the mass-volume ratio of aniline liquid and toluene is 0.7-1.0g:80-160mL.

6. The method of claim 1, wherein the method further comprises adding a corrosion inhibitor to the mixture. In S2, the mass-volume ratio of p-phenylenediamine modified graphene, corrosion inhibitor and water is 0.2-0.5g:0.2-0.5g:50-250mL.

7. The method of claim 1, wherein the method further comprises adding a corrosion inhibitor to the mixture of the epoxy resin, the curing agent, and the anti-static agent. In S2, the hydrochloric acid is 1-2mol / L hydrochloric acid, and the mass-volume ratio of ammonium persulfate and hydrochloric acid is 2-3g:20-50mL.

8. The method of claim 1, wherein the method further comprises the step of adding a corrosion inhibitor to the mixture of the epoxy resin, the curing agent, and the anti-static agent. In S3, the mass ratio of carbon nanotubes and graphene-polyaniline capsules is 1-4:

1.

9. The method of claim 1, wherein the method further comprises the step of adding a corrosion inhibitor to the mixture of the epoxy resin, the curing agent, and the anti-static agent. In S3, the mass ratio of the mixed conductive filler and the epoxy resin is 0.2-5:

100.

10. The anti-static corrosion resistant epoxy coating prepared by the method according to any one of claims 1-9, characterized in that, The thickness of the epoxy coating is 100-250μm.

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