Superomniphobic graphene oxide microparticles, method for producing same, powder coating and method for producing same and use thereof

Abstract

The application discloses super-amphiphobic graphene oxide microparticles, a preparation method of the super-amphiphobic graphene oxide microparticles, powder coating and a preparation method and application of the powder coating. The composition of the super-amphiphobic graphene oxide microparticles comprises graphene oxide microparticles, silica particles and fluorine-containing silane, the silica particles are in-situ grown on the surface of the graphene oxide microparticles, and the fluorine-containing silane is grafted on the surface of the graphene oxide microparticles and the silica particles. The powder coating comprises polymer powder and the super-amphiphobic graphene oxide microparticles, the mass percentage of the super-amphiphobic graphene oxide microparticles in the powder coating is 5% to 40%, and the composition of the polymer powder comprises resin, curing agent, pigment and filler and additive. The super-amphiphobic graphene oxide microparticles have excellent hydrophobicity and oleophobicity, and the preparation method is simple. The coating formed by the powder coating has super-amphiphobic effect, good corrosion resistance and strong adhesion, and is suitable for large-scale industrial application.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology, specifically to superhydrophobic graphene oxide microparticles and their preparation methods, powder coatings and their preparation methods and applications. Background Technology

[0002] Superhydrophobic materials are a new type of material inspired by the surface structure of lotus leaves. They typically possess a certain degree of self-cleaning ability and can be applied to metal surfaces to prevent corrosion. However, while traditional superhydrophobic materials perform well in resisting sewage erosion, they are easily contaminated by sewage containing oils, leading to a reduction or even loss of their superhydrophobic properties, thus greatly limiting their practical applications.

[0003] Powder coatings are solid powdered synthetic resin coatings composed of solid resins, pigments, fillers, and additives. They have advantages such as being free of volatile organic compounds (VOCs) and having a high material utilization rate (over 99%), and have been widely used as functional protective coatings for metal substrates in recent years. However, existing powder coatings typically only have a certain degree of hydrophobicity, and their surfaces are easily contaminated by grease and oil, failing to meet the growing requirements of practical applications.

[0004] Therefore, it is of great significance to develop a powder material with superhydrophobic and superoleophobic coatings. Summary of the Invention

[0005] The purpose of this invention is to provide superhydrophobic graphene oxide microparticles and their preparation methods, powder coatings and their preparation methods and applications.

[0006] The technical solution adopted in this invention is:

[0007] A superhydrophobic graphene oxide microparticle, comprising graphene oxide microparticles, silica particles, and fluorinated silane; wherein the silica particles are grown in situ on the surface of the graphene oxide microparticles; and the fluorinated silane is grafted onto the surfaces of the graphene oxide microparticles and the silica particles.

[0008] Preferably, the particle size of the graphene oxide microparticles is 1 μm to 50 μm.

[0009] Preferably, the particle size of the silica particles is 0.5 μm to 50 μm.

[0010] Preferably, the particle size of the superhydrophobic graphene oxide microparticles is 1 μm to 150 μm.

[0011] Preferably, the fluorinated silane is at least one of perfluorooctyltriethoxysilane, perfluorooctyltrimethoxysilane, and perfluorooctyltrichlorosilane.

[0012] A method for preparing the superhydrophobic graphene oxide microparticles as described above includes the following steps:

[0013] 1) Graphene oxide microparticles, silicon source, alcohol solvent and alkaline solution are mixed and reacted to obtain a reaction solution containing graphene oxide-silica composite particles;

[0014] 2) Fluorosilane is added to the reaction solution containing graphene oxide-silica composite particles for reaction, and then the solid product is separated and dried to obtain superhydrophobic graphene oxide microparticles.

[0015] Preferably, the silicon source in step 1) is at least one of ethyl silicate (TEOS), methyltrimethoxysilane (MTMS), ethyltrimethoxysilane (MTES), ethyltriethoxysilane (ETEOS), and sodium silicate.

[0016] Preferably, the alcohol solvent in step 1) is at least one of ethanol, methanol, and isopropanol.

[0017] Preferably, the alkaline solution in step 1) is at least one of sodium hydroxide solution, ammonia water, and potassium hydroxide solution.

[0018] Preferably, the reaction in step 1) is carried out at a temperature of 10℃ to 50℃ for a reaction time of 0.5h to 24h.

[0019] Preferably, the reaction in step 2) is carried out at a temperature of 20℃ to 80℃ for a reaction time of 0.5h to 12h.

[0020] Preferably, the drying in step 2) is carried out at a temperature of 50℃ to 100℃ for a drying time of 1h to 8h.

[0021] A powder coating is composed of polymer powder and the aforementioned superhydrophobic graphene oxide microparticles; the superhydrophobic graphene oxide microparticles have a mass percentage content of 5% to 40% in the powder coating; the polymer powder comprises the following components in parts by mass: 50 to 100 parts of resin, 5 to 10 parts of curing agent, 20 to 50 parts of pigments and fillers, and 3 to 8 parts of additives.

[0022] Preferably, the resin is at least one of epoxy resin, acrylic resin, and polyester resin.

[0023] A method for preparing a powder coating as described above includes the following steps:

[0024] The polymer powder and superhydrophobic graphene oxide microparticles are mixed evenly, and then extruded, pressed, ground and sieved to obtain the powder coating.

[0025] A method of using powder coating as described above includes the following steps:

[0026] The above-mentioned powder coating is electrostatically sprayed onto the surface of a metal substrate, and then baked, cured, and cooled to obtain a coating with superhydrophobic and anti-repellent properties.

[0027] Preferably, the electrostatic spraying process parameters are: electrostatic voltage of 60kV to 70kV, distance between the spray gun nozzle and the metal substrate of 10cm to 20cm, spraying angle of 70° to 90°, and spraying pressure of 0.4MPa to 0.7MPa.

[0028] Preferably, the baking and curing is carried out at a temperature of 190℃ to 220℃ for a time of 5 min to 20 min.

[0029] A powder coating as described above is used for metal corrosion protection.

[0030] The beneficial effects of this invention are: the superhydrophobic and oleophobic graphene oxide microparticles of this invention possess excellent hydrophobicity and oleophobicity, and their preparation method is simple. The powder coating formed by this invention exhibits superhydrophobic and oleophobic effects, and also has good corrosion resistance and strong adhesion, making it suitable for large-scale industrial applications.

[0031] Specifically:

[0032] 1) The powder coating of the present invention can construct superhydrophobic and amphoteric surfaces on most substrates. Compared with constructing superhydrophobic and amphoteric surfaces by electrochemical or laser etching methods, it greatly reduces the preparation difficulty and greatly improves the application range of superhydrophobic and amphoteric materials. At the same time, the electrostatic powder spraying method has the advantage of no VOC release, which is more in line with the concept of green environmental protection.

[0033] 2) The superhydrophobic surface formed by the powder coating of the present invention can effectively reduce the contact between the material surface and water droplets or oil stains, improve the corrosion resistance of the substrate, slow down the corrosion and aging rate of the substrate surface, and extend the service life of the device. At the same time, the superhydrophobic surface also has good self-cleaning properties, making the cleaning of solid contaminants more efficient and convenient, which can save maintenance costs and has good application prospects. In addition, the special large aspect ratio and excellent mechanical properties of graphene oxide itself can also enhance the corrosion resistance and adhesion of the coating. Attached Figure Description

[0034] Figure 1 This is a SEM image of the superhydrophobic graphene oxide microparticles in Example 1.

[0035] Figure 2 The infrared spectra of the graphene oxide microparticles, superhydrophobic graphene oxide microparticles, polymer powder, and powder coating in Example 1 are shown.

[0036] Figure 3The TGA curves are for the graphene oxide microparticles and superhydrophobic graphene oxide microparticles in Example 1.

[0037] Figure 4 The image shows the water contact angle test results of the coating formed by powder coating 4 in Example 1.

[0038] Figure 5 The image shows the oil contact angle test results of the coating formed by powder coating 4 in Example 1.

[0039] Figure 6 This is a SEM image of the surface of the coating formed by powder coating 4 in Example 1.

[0040] Figure 7 This is a SEM image of a cross-section of the coating formed by powder coating 4 in Example 1.

[0041] Figure 8 The graph shows the salt spray resistance test results of the coatings formed by powder coating 4 in Example 1 and powder coating D1 in Comparative Example 1. Detailed Implementation

[0042] The present invention will be further explained and described below with reference to specific embodiments.

[0043] Example 1:

[0044] A superhydrophobic graphene oxide microparticle, the preparation method of which is as follows:

[0045] 1) Mix 1g of graphene oxide microparticles (particle size 10μm~20μm), 10mL of tetraethyl orthosilicate (TEOS), 100mL of ethanol and 10mL of ammonia (mass fraction 25%), and stir in a water bath at 20℃ for 18h to obtain a reaction solution containing graphene oxide-silica composite particles.

[0046] 2) Add 0.5 mL of perfluorooctyltrimethoxysilane to the reaction solution containing graphene oxide-silica composite particles, stir for 6 h in a water bath at 20 °C, filter, and dry the solid product at 80 °C for 8 h to obtain superhydrophobic graphene oxide microparticles.

[0047] A powder coating is prepared as follows:

[0048] 1) Epoxy resin (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide and leveling agent (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed and ground into powder, and then passed through a 300-mesh sieve to obtain polymer powder;

[0049] 2) Mix the polymer powder and superhydrophobic graphene oxide microparticles at mass ratios of 95:5, 90:10, 80:20, 70:30 and 60:40 respectively, then melt and extrude at 80°C, then press, crush and grind, and then pass through a 300-mesh sieve to obtain powder coatings 1 to 5.

[0050] Example 2:

[0051] A superhydrophobic graphene oxide microparticle, the preparation method of which is as follows:

[0052] 1) Mix 1g of graphene oxide microparticles (particle size 1μm~5μm), 10mL of TEOS, 100mL of ethanol and 10mL of ammonia (mass fraction 25%), and stir in a water bath at 20℃ for 18h to obtain a reaction solution containing graphene oxide-silica composite particles.

[0053] 2) Add 0.5 mL of perfluorooctyltrimethoxysilane to the reaction solution containing graphene oxide-silica composite particles, stir for 6 h in a water bath at 20 °C, filter, and dry the solid product at 80 °C for 8 h to obtain superhydrophobic graphene oxide microparticles.

[0054] A powder coating is prepared as follows:

[0055] 1) Epoxy resin (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide and leveling agent (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed and ground into powder, and then passed through a 100-mesh sieve to obtain polymer powder;

[0056] 2) Mix the polymer powder and superhydrophobic graphene oxide microparticles at a mass ratio of 70:30, then melt and extrude at 80°C, then press, crush and grind, and finally pass through a 100-mesh sieve to obtain powder coating 6.

[0057] Example 3:

[0058] A superhydrophobic graphene oxide microparticle, the preparation method of which is as follows:

[0059] 1) Mix 1g of graphene oxide microparticles (particle size 10μm~20μm), 10mL of TEOS, 100mL of ethanol and 10mL of ammonia (mass fraction 25%) and stir in a water bath at 20℃ for 18h to obtain a reaction solution containing graphene oxide-silica composite particles.

[0060] 2) Add 0.5 mL of perfluorooctyltriethoxysilane to the reaction solution containing graphene oxide-silica composite particles, stir for 6 h in a water bath at 20 °C, filter, and dry the solid product at 80 °C for 8 h to obtain superhydrophobic graphene oxide microparticles.

[0061] A powder coating is prepared as follows:

[0062] 1) Epoxy resin (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide and leveling agent (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed and ground into powder, and then passed through a 100-mesh sieve to obtain polymer powder;

[0063] 2) Mix the polymer powder and superhydrophobic graphene oxide microparticles at a mass ratio of 70:30, then melt and extrude at 80°C, then press, crush and grind, and finally pass through a 100-mesh sieve to obtain powder coating 7.

[0064] Example 4:

[0065] A superhydrophobic graphene oxide microparticle, the preparation method of which is as follows:

[0066] 1) Mix 1g of graphene oxide microparticles (particle size 10μm~20μm), 10mL of TEOS, 100mL of ethanol and 10mL of sodium hydroxide solution with a concentration of 1mol / L, and stir for 18h in a water bath at a temperature of 20℃ to obtain a reaction solution containing graphene oxide-silica composite particles.

[0067] 2) Add 0.5 mL of perfluorooctyltrimethoxysilane to the reaction solution containing graphene oxide-silica composite particles, stir for 6 h in a water bath at 20 °C, filter, and dry the solid product at 80 °C for 8 h to obtain superhydrophobic graphene oxide microparticles.

[0068] A powder coating is prepared as follows:

[0069] 1) Epoxy resin (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide and leveling agent (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed and ground into powder, and then passed through a 100-mesh sieve to obtain polymer powder;

[0070] 2) Mix the polymer powder and superhydrophobic graphene oxide microparticles at a mass ratio of 70:30, then melt and extrude at 80°C, then press, crush and grind, and then pass through a 100-mesh sieve to obtain powder coating 8.

[0071] Example 5:

[0072] A superhydrophobic graphene oxide microparticle, the preparation method of which is as follows:

[0073] 1) Mix 1g of graphene oxide microparticles (particle size 10μm~20μm), 10mL of ethyltriethoxysilane (ETEOS), 100mL of ethanol and 10mL of ammonia (mass fraction 25%), and stir for 18h in a water bath at 20℃ to obtain a reaction solution containing graphene oxide-silica composite particles.

[0074] 2) Add 0.5 mL of perfluorooctyltrimethoxysilane to the reaction solution containing graphene oxide-silica composite particles, stir for 6 h in a water bath at 20 °C, filter, and dry the solid product at 80 °C for 8 h to obtain superhydrophobic graphene oxide microparticles.

[0075] A powder coating is prepared by the following method:

[0076] 1) Epoxy resin (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide and leveling agent (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed and ground into powder, and then passed through a 100-mesh sieve to obtain polymer powder;

[0077] 2) Mix the polymer powder and superhydrophobic graphene oxide microparticles at a mass ratio of 70:30, then melt and extrude at 80°C, then press, crush and grind, and finally pass through a 100-mesh sieve to obtain powder coating 9.

[0078] Comparative Example 1:

[0079] A powder coating is prepared by the following method:

[0080] Epoxy resin (Zhongshan Huaxingong Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide, and leveling agent (Zhongshan Huaxingong Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed, and ground into powder, and finally passed through a 100-mesh sieve to obtain powder coating D1.

[0081] Comparative Example 2:

[0082] A powder coating is prepared by the following method:

[0083] 1) Epoxy resin (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name 804u), dicyandiamide, titanium dioxide and leveling agent (Zhongshan Huaxin Engineering Materials Technology Co., Ltd., brand name HG313) are mixed in a mass ratio of 100:10:50:3, melt-extruded at 80°C, then pressed, crushed and ground into powder, and then passed through a 100-mesh sieve to obtain polymer powder;

[0084] 2) Pass the superhydrophobic silica powder (Shanghai McLean Biochemical Technology Co., Ltd.; particle size 1μm~20μm) through a 300-mesh sieve, then mix the polymer powder and superhydrophobic silica powder evenly at a mass ratio of 95:5, then melt and extrude at 80℃, then press, crush and grind, and then pass through a 100-mesh sieve to obtain powder coating D2.

[0085] Performance testing:

[0086] 1) Scanning electron microscope (SEM) image of the superhydrophobic graphene oxide microparticles in Example 1 is shown below. Figure 1 As shown.

[0087] Depend on Figure 1 It can be seen that the particle size of the superhydrophobic graphene oxide microparticles is about 19 μm, and small-sized silica particles with a particle size of about 2 μm are distributed on its surface and edges.

[0088] 2) The Fourier Transform Infrared (FTIR) spectra of the graphene oxide microparticles (GO), superaperopeptide graphene oxide microparticles (FGO), polymer powder (PU), and powder coating (PU-FGO) in Example 1 are shown below. Figure 2 As shown.

[0089] Depend on Figure 2 It can be seen that the superhydrophobic graphene oxide microparticles have obvious CF peaks. The introduction of fluorine is the key factor to achieve superhydrophobicity and also the key to endowing the coating with high weather resistance.

[0090] 3) The thermogravimetric analysis (TGA) curves of graphene oxide microparticles (GO) and superaperopeptide graphene oxide microparticles (FGO) in Example 1 are shown below. Figure 3 As shown.

[0091] Depend on Figure 3 It can be seen that graphene oxide, as a carbon material, will burn to produce carbon dioxide after being treated at high temperature in air. The remaining mass is the mass of SiO2 attached to the surface. Therefore, it can be determined that the mass ratio of carbon to silicon in the superhydrophobic graphene oxide particles is about 2:3.

[0092] 4) The powder coating 4 from Example 1 was electrostatically sprayed onto the carbon steel surface. The electrostatic spraying process was as follows: electrostatic voltage of 60kV, spraying distance of 15cm, spraying angle of 80°, and spraying pressure of 0.5MPa. The coating was then baked and cured at 210℃ for 5 minutes, followed by natural cooling to form a coating. The water contact angle test results of the obtained coating are as follows. Figure 4 As shown, the oil (linseed oil) contact angle test results of the coating are as follows: Figure 5 As shown, the SEM image of the coating surface is as follows. Figure 6 As shown, the SEM image of the coating cross-section is as follows. Figure 7 As shown.

[0093] Depend on Figure 4 and Figure 5 It can be seen that the water contact angle and oil contact angle of the coating formed by powder coating 4 are both greater than 150°, indicating that the coating has superhydrophobic and aphobic properties.

[0094] Depend on Figure 6 and Figure 7 It can be seen that the surface of the coating formed by powder coating 4 is obviously distributed with sheet-like graphene oxide sheet structure, and at the same time, micron / submicron-sized silica protrusion structure is attached to the surface. This structure constitutes the main roughness of the coating surface.

[0095] 5) Powder coatings 1-9 from Examples 1-5 and powder coatings D1-D2 from Comparative Examples 1-2 were electrostatically sprayed onto the surface of carbon steel. The electrostatic spraying process was as follows: electrostatic voltage of 60kV, spraying distance of 15cm, spraying angle of 80°, and spraying pressure of 0.5MPa. After baking and curing at 210℃ for 5min, the coating was allowed to cool naturally to form a coating. The appearance, water contact angle, oil (linseed oil) contact angle, and durability of the coating were tested and are shown in the table below:

[0096] Table 1. Results of coating appearance, water contact angle, oil contact angle, and durability tests.

[0097] Powder Coating 1 Smooth 137 81 No change Powder Coating 2 Smooth 156 109 No change Powder Coating 3 Smooth 155 129 No change Powder Coating 4 Smooth 155 151 No change Powder Coating 5 Smooth 154 150 No change Powder Coating 6 Smooth 158 153 No change Powder Coating 7 Smooth 155 151 No change Powder Coating 8 Smooth 156 150 No change Powder Coating 9 Smooth 155 151 No change Powder Coating D1 Smooth 72 60 Slight discoloration Powder Coating D2 Smooth 156 80 Loss of hydrophobicity

[0098] Note:

[0099] Durability: Test whether there are significant changes in appearance, water contact angle and oil contact angle of the coating after 90 days of outdoor exposure.

[0100] As shown in Table 1:

[0101] a) The changes in the water contact angle and oil contact angle of the coatings formed by powder coatings 1 to 5 in Example 1 show that superhydrophobicity can be achieved when the mass percentage of superhydrophobic graphene oxide particles in the powder coating reaches 5%, and superhydrophobic properties can be achieved when the mass percentage of superhydrophobic graphene oxide particles in the powder coating reaches 20%. Thereafter, further increasing the amount of superhydrophobic graphene oxide particles added has little effect on the superhydrophobic properties of the coating.

[0102] b) In Examples 2 to 5, superhydrophobic graphene oxide was prepared by adjusting the particle size of graphene oxide particles, the type of fluorinated silane, the type of alkaline solution, and the type of silicon source, and powder coatings 6 to 9 were prepared. The actual performance of the coatings formed by powder coatings 6 to 9 was very similar to that of the coatings formed by powder coatings 1 to 5.

[0103] 6) The powder coating 4 from Example 1 and the powder coating D1 from Comparative Example 1 were electrostatically sprayed onto the surface of carbon steel. The electrostatic spraying process was as follows: electrostatic voltage of 60kV, spraying distance of 15cm, spraying angle of 80°, and spraying pressure of 0.5MPa. The coating was then baked and cured at 210℃ for 5 minutes, allowed to cool naturally, and a coating was formed. A 7-day accelerated salt spray corrosion test was then conducted. The salt spray resistance test results of the obtained coating are as follows: Figure 8 (a is powder coating 4 in Example 1, b is powder coating D1 in Comparative Example 1) as shown.

[0104] Depend on Figure 8 It can be seen that the superhydrophobic coating formed by powder coating 4 in Example 1 has better metal corrosion protection performance.

[0105] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A powder coating, characterized in that, It is composed of polymer powder and superhydrophobic graphene oxide microparticles; the superhydrophobic graphene oxide microparticles have a mass percentage content of 30% to 40% in the powder coating; the polymer powder includes the following components in parts by mass: 50 to 100 parts of resin, 5 to 10 parts of curing agent, 20 to 50 parts of pigments and fillers, and 3 to 8 parts of additives. The superhydrophobic graphene oxide microparticles are composed of graphene oxide microparticles, silicon dioxide particles, and fluorinated silanes. The silica particles are grown in situ on the surface of the graphene oxide particles; the fluorinated silane is grafted onto the surfaces of the graphene oxide particles and the silica particles. The graphene oxide microparticles have a particle size of 1 μm to 50 μm; the silica particles have a particle size of 0.5 μm to 50 μm. The particle size of the superhydrophobic graphene oxide microparticles is 1 μm to 150 μm; the fluorinated silane is at least one of perfluorooctyltriethoxysilane, perfluorooctyltrimethoxysilane, and perfluorooctyltrichlorosilane.

2. A powder coating as described in claim 1, characterized in that, The preparation method of the superhydrophobic graphene oxide microparticles includes the following steps: 1) Graphene oxide microparticles, silicon source, alcohol solvent and alkaline solution are mixed and reacted to obtain a reaction solution containing graphene oxide-silica composite particles; 2) Fluorosilane is added to the reaction solution containing graphene oxide-silica composite particles for reaction, and then the solid product is separated and dried to obtain superhydrophobic graphene oxide microparticles.

3. The powder coating according to claim 2, characterized in that: The silicon source in step 1) is at least one of ethyl silicate, methyltrimethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, and sodium silicate; the alcohol solvent in step 1) is at least one of ethanol, methanol, and isopropanol; the alkaline solution in step 1) is at least one of sodium hydroxide solution, ammonia, and potassium hydroxide solution.

4. The powder coating according to claim 2 or 3, characterized in that: Step 1) The reaction is carried out at a temperature of 10℃ to 50℃ for a reaction time of 0.5h to 24h; Step 2) The reaction is carried out at a temperature of 20℃ to 80℃ for a reaction time of 0.5h to 12h.

5. The powder coating according to claim 1, characterized in that: The resin is at least one of epoxy resin, acrylic resin, and polyester resin.

6. A method for preparing a powder coating as described in claim 1 or 5, characterized in that, The process includes the following steps: mixing polymer powder and superhydrophobic graphene oxide microparticles, followed by extrusion, tableting, grinding and sieving to obtain powder coating.

7. An application of the powder coating as described in claim 1 for metal corrosion protection.

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