Graphene-coated steel sheet

Abstract

A graphene-coated steel sheet in one specific embodiment may include: a clad steel sheet; and a graphene coating disposed on the clad steel sheet and containing graphene, wherein, based on the total weight of the graphene coating, the graphene content may be 0.1-30% by weight, and the average distribution area ratio of graphene particles per unit area (0.1mm × 0.1mm) of the graphene coating may be 10 or more.

Description

Technical Field

[0001] This invention relates to a graphene-coated steel sheet. Background Technology

[0002] Graphene is a two-dimensional (2D) crystal structure consisting of a single atomic layer of carbon atoms arranged in a specific pattern. It is a planar structure in which carbon atoms are connected in a hexagonal shape.

[0003] Graphene has a tensile strength 311 times greater than steel, an electron mobility 1000 times faster than silicon, and a thermal conductivity more than 10 times better than copper. It also boasts 98% light transmittance and retains its properties even when bent or stretched. Due to these characteristics, it can be widely used in nanomaterials, inks, barrier materials, heat dissipation materials, ultralight materials, energy electrode materials, next-generation semiconductors, and transparent electrodes.

[0004] However, when using solution coating to coat graphene, the current situation requires that the graphene be uniformly distributed within the coating in order to achieve the desired physical properties. Summary of the Invention

[0005] (a) Technical problems to be solved According to one specific embodiment of the present invention, a graphene-coated steel sheet with excellent formability and heat dissipation can be provided.

[0006] According to one specific embodiment of the present invention, a graphene-coated steel sheet that exhibits excellent heat dissipation even when other coatings are included can be provided.

[0007] According to one specific embodiment of the present invention, a graphene-coated steel sheet that exhibits excellent heat dissipation even when mixed with other pigments can be provided.

[0008] (II) Technical Solution As one embodiment of the present invention, a graphene-coated steel sheet includes: a plated steel sheet; and a graphene coating, wherein the graphene coating is disposed on the plated steel sheet and contains graphene, wherein, based on the total weight of the graphene coating, the content of graphene is 0.1-30% by weight, and the average distribution area ratio of graphene particles per unit area (0.1mm × 0.1mm) of the graphene coating is 10% or more.

[0009] The coated steel sheet may be selected from at least one of galvanized steel sheet, zinc alloy coated steel sheet, aluminized steel sheet, aluminum alloy coated steel sheet, cold-rolled steel sheet, and hot-rolled steel sheet.

[0010] The graphene coating may include an adhesive.

[0011] The adhesive may be two or more acrylic resins.

[0012] The two or more acrylic resins may be selected from two or more copolymers of ethylene acrylate (EAA) and polyethylene (PE), copolymers of ethylene acrylate (EAA) and polyurethane (PU), polymethyl methacrylate, polyacrylonitrile, cyclohexyl acrylate, glycidyl acrylate and hydroxyalkyl acrylate.

[0013] The adhesive may further comprise at least one selected from epoxy resins, urethane resins, fluoropolymers, polyester resins, polyvinyl chloride resins, and vinyl chloride resins.

[0014] The epoxy resin may be at least one selected from bisphenol A type resin, bisphenol F type resin, phenolic varnish resin, acrylic modified epoxy resin, alicyclic resin and glycidylamine type resin.

[0015] The urethane-based resin may be at least one selected from isophorone diisocyanate, adipic acid and polyols to prepare polyurethane, acrylic polyol and polyisocyanate.

[0016] The fluoropolymer resin may be a fluoropolymer polyurethane resin obtained using perfluoroalkyl alcohols, perfluoroacrylate polyols, fluorinated polyolefin polyols, or mixtures thereof, or at least one selected from polymethyl α-fluoroacrylate, block poly-α-fluoroacrylate, polyethyl-α-fluoroacrylate, and polyfluoroalkyl acrylate.

[0017] The graphene coating may further include additives.

[0018] The additive may be at least one selected from titanium-based compounds, ammonium phosphates, vanadium-based compounds, organic phosphoric acid, ammonium phosphates, organic acids, leveling agents, wetting agents, curing agents, and defoamers.

[0019] The graphene-coated steel plate can satisfy the following formula (1): [Equation (1)] C G ·t≥0.71 (In the above formula (1), C) G t represents the graphene content (by weight %) in the graphene coating, and t is the coating thickness (μm). The graphene-coated steel plate can satisfy the following equation (2): [Equation (2)] C G 1 / 6 ·t≤32 (In the above equation (2), C) Gt represents the graphene content (by weight %) in the graphene coating, and t is the coating thickness (μm). The thickness of the graphene coating can be 0.1-30 μm.

[0020] (III) Beneficial Effects According to one specific embodiment of the present invention, a graphene-coated steel sheet with excellent formability and heat dissipation can be provided.

[0021] According to one specific embodiment of the present invention, a graphene-coated steel sheet that exhibits excellent heat dissipation even when other coatings are included can be provided.

[0022] According to one specific embodiment of the present invention, a graphene-coated steel sheet that exhibits excellent heat dissipation even when mixed with other pigments can be provided. Best practice

[0023] The preferred embodiments of the present invention are described below. However, the embodiments of the present invention can be modified in many other forms, and the scope of the present invention is not limited to the embodiments described below.

[0024] Furthermore, embodiments of the present invention are provided to provide a more complete explanation of the invention to those skilled in the art.

[0025] The shapes and sizes of elements in the accompanying drawings may be enlarged for clearer illustration.

[0026] In describing embodiments of the present invention, detailed descriptions of well-known technologies related to the present invention may unnecessarily obscure the essence of the invention, such detailed descriptions will be omitted. Furthermore, the terminology used below is defined in consideration of the functionality in the present invention and may vary depending on the intent of the user, operator, or convention. Therefore, its definition should be determined based on the entire contents of this specification. The terminology used in the detailed description is only for describing embodiments of the present invention and should not be limiting in any way. Unless expressly used otherwise, the singular form includes the meaning of the plural form.

[0027] In this description, expressions such as “including,” “comprising,” or “possessing” are used to indicate certain characteristics, numbers, steps, actions, elements, a portion thereof, or combinations thereof, and should not be construed as excluding the existence or possibility of one or more other characteristics, numbers, steps, actions, elements, a portion thereof, or combinations thereof beyond what is described.

[0028] Unless otherwise specified, the % units in this specification refer to weight.

[0029] Furthermore, throughout the instruction manual, when a part is "connected" to other parts, this includes not only "direct connection" but also "indirect connection" where other elements are sandwiched in between.

[0030] The present invention will now be described in detail through various embodiments or implementation schemes. It should be noted that the embodiments or implementation schemes described in this specification are not limited to illustrating only one embodiment or implementation scheme, but can also be combined with other embodiments or implementation schemes. Therefore, the claim references in the claims only correspond to one example of an embodiment, and the technical concept of the present invention should not be interpreted solely as a combination with the referenced claims; combinations with various claims are also included within the scope of the technical concept of the present invention.

[0031] The terminology used in this invention is for illustrative purposes and is not intended to limit the invention. Furthermore, unless the relevant definitions explicitly state otherwise, the singular form used in this invention also includes the plural form.

[0032] The word "comprising" or "including" as used in this invention means to specify the constituent parts, and does not exclude the existence or addition of other constituent parts.

[0033] Unless otherwise defined, all terms used in this invention, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in dictionaries shall be interpreted as having meanings consistent with relevant technical documents and current disclosures.

[0034] The following is a detailed description of a graphene-coated steel sheet according to a specific embodiment of the present invention.

[0035] The inventors conducted experiments by changing the graphene concentration and coating thickness within the coating, confirming a certain correlation between heat dissipation characteristics and the graphene area ratio, and further confirming that the graphene area ratio is determined by the graphene concentration and coating thickness within the coating.

[0036] Therefore, a graphene-coated steel sheet according to a specific embodiment of the present invention may include: a plated steel sheet; and a graphene coating, wherein the graphene coating is disposed on the plated steel sheet and contains graphene, wherein, based on the total weight of the graphene coating, the content of the graphene may be 0.1-30% by weight, and the average distribution area ratio of graphene particles per unit area of ​​the graphene coating may be more than 10%.

[0037] In this specification, the average graphene distribution area ratio is defined as the proportion of graphene in the total area of ​​an image obtained using an image analyzer and measured at magnification of 500x to 1000x using an optical microscope. Furthermore, the average graphene distribution area ratio is based on the average of five measurements.

[0038] The type of coated steel sheet described in this invention is not particularly limited. For example, it can be galvanized steel sheet, zinc alloy coated steel sheet, aluminized steel sheet, aluminum alloy coated steel sheet, cold-rolled steel sheet, and hot-rolled steel sheet.

[0039] The thickness of the graphene coating is not particularly limited, for example, it can be 0.1-30 μm. When the coating thickness is less than 0.1 μm, the surface treatment solution composition will be thinly coated on the rough protrusions of the plated steel sheet surface, resulting in reduced corrosion resistance. On the other hand, when the coating thickness is greater than 30 μm, the processability will deteriorate due to the thicker film layer (coating), and the solution treatment cost will increase, which is economically disadvantageous.

[0040] The thickness mentioned refers to the thickness after drying.

[0041] Therefore, a graphene-coated steel sheet in one specific embodiment may include a graphene coating disposed on the coated steel sheet and containing graphene. The coated steel sheet with the graphene coating can exhibit excellent corrosion resistance, processability, adhesion, and heat dissipation.

[0042] The graphene coating, with an average distribution area ratio of graphene particles per unit area (0.1mm × 0.1mm), can be 10% or more, specifically 20% or more, more specifically 30% or more, further specifically 40% or more, and even further specifically 50% or more. When the average distribution area ratio of graphene particles is less than 10%, the graphene content in the graphene coating is low, and the heat dissipation may be poor.

[0043] The type of graphene particles is not particularly limited.

[0044] Based on the total weight of the graphene coating, the graphene content can be 0.1-30% by weight, specifically 0.1-10% by weight, and more specifically 0.1-20% by weight. Based on the total weight of the graphene coating, when the graphene content is less than 0.1% by weight, the heat dissipation may be poor; when the graphene content is greater than 30% by weight, the dispersion stability may be poor.

[0045] The size of the graphene particles can refer to the lateral size of the graphene, which is not particularly limited, for example, it can be 1-5 μm.

[0046] The graphene coating may include an adhesive. The adhesive can improve the dispersion stability of the graphene and provide excellent ductility and processability when coating the steel sheet.

[0047] The adhesive may be an adhesive based on two or more acrylic resins. The solution composition containing the adhesive may exhibit excellent dispersion stability with graphene and may possess ductility and processability when coated on steel sheets.

[0048] The two or more acrylic resins can be selected from two or more copolymers of ethylene acrylate (EAA) and polyethylene (PE), copolymers of ethylene acrylate (EAA) and polyurethane (PU), polymethyl methacrylate, polyacrylonitrile, cyclohexyl acrylate, glycidyl acrylate, hydroxyalkyl acrylate, etc. Specifically, they can be copolymers of ethylene acrylate (EAA) and polyethylene (PE) and copolymers of ethylene acrylate (EAA) and polyurethane (PU).

[0049] When the adhesive for the graphene coating contains two acrylic resins, the ratio of the content of each resin can be from 1:1 to 1:6, specifically from 1:3 to 1:5. When the adhesive contains two acrylic resins in the above ratio, corrosion resistance, processability, and coating adhesion can be improved, and the physical properties of the coating can be enhanced compared to the case containing only one acrylic resin.

[0050] The adhesive is not particularly limited, but may further include at least one selected from epoxy resins, urethane resins, fluoropolymers and polyester resins, polyvinyl chloride resins, vinyl chloride resins, etc.

[0051] The epoxy resin may be at least one selected from bisphenol A type resin, bisphenol F type resin, phenolic varnish resin, acrylic modified epoxy resin, alicyclic resin, glycidylamine type resin, etc.

[0052] The urethane-based resin may be at least one selected from isophorone diisocyanate, polyurethane prepared from adipic acid and polyol, acrylic polyol, polyisocyanate, etc.

[0053] The fluoropolymer resin may be a fluoropolymer polyurethane resin obtained using perfluoroalkyl alcohols, perfluoroacrylate polyols, fluorinated polyolefin polyols, or mixtures thereof, or at least one selected from polymethyl α-fluoroacrylate, block poly-α-fluoroacrylate, polyethyl-α-fluoroacrylate, polyfluoroalkyl acrylate, etc.

[0054] The graphene coating may contain 55-90% by weight of binder, specifically 60-90% by weight. When the content of the binder is less than 55% by weight, the corrosion resistance, processability, coating adhesion may be poor, and the dispersion stability of the graphene may be poor. When the content of the binder is greater than 90% by weight, the heat dissipation may be poor.

[0055] The graphene coating is not particularly limited, and may further include additives, for example.

[0056] Among the additives, the physical property modifier can improve the adhesion between the steel plate and the coating, and can improve corrosion resistance. The physical property modifier can be at least one selected from titanium-based compounds, ammonium phosphates, vanadium-based compounds, organophosphates, ammonium phosphates, and organic acids, specifically at least one selected from titanium-based compounds and ammonium phosphates.

[0057] The graphene coating may contain 5-40% by weight of a physical property modifier in the additives. When the content of the physical property modifier in the graphene-coated steel sheet is less than 5% by weight, the physical properties of the coated steel sheet may decrease. When the content of the physical property modifier is greater than 40% by weight, corrosion resistance, adhesion, and processability may decrease.

[0058] The additive may be at least one selected from leveling agents, wetting agents, curing agents, and defoamers.

[0059] The leveling agent may be at least one selected from silicone-modified polyacrylate, polyacrylate, fluorinated polyacrylate, polysiloxane, etc.

[0060] The wetting agent serves to ensure that the graphene-coated steel plate adheres well to the steel plate, and can be at least one selected from polyether-modified polyalkylsiloxanes, aralkyl-modified polyalkylsiloxanes, polyether-modified siloxanes, polymeric fluorinated surfactants, alcohol alkoxylates (non-silicon).

[0061] The curing agent serves to form a dry coating film on the graphene-coated steel plate after coating, and can be at least one selected from amines, amides, silane coupling agents, carbodilites, isocyanates, aziridines, epoxy compounds, crosslinkers, etc.

[0062] The defoamer reduces the generation of bubbles during the stirring and roller coating of graphene-coated steel sheets, and can be at least one selected from silicon-based, mineral oil-based, and polymer-based (non-silicon, mineral oil type).

[0063] The graphene coating is not particularly limited, and may contain, for example, 1-5% by weight of additives.

[0064] The composition for graphene-coated steel sheet in one specific embodiment may further include a balance of solvent. The solvent may be at least one selected from water, 1-ethyl-2-pyrrolidone (NEP), and dimethyl sulfoxide (DMSO).

[0065] The graphene-coated steel sheet can satisfy the following formula (1).

[0066] [Equation (1)] C G ·t≥0.71 (In the above formula (1), C) G t represents the graphene content (by weight %) in the graphene coating, and t is the coating thickness (μm). In the above equation (1), when C G • When the t value is less than 0.71, the heat dissipation performance of graphene-coated steel plates may be poor.

[0067] Furthermore, the graphene-coated steel sheet can satisfy the following formula (2).

[0068] [Equation (2)] C G 1 / 6 ·t≤32 (In the above equation (2), C) G t represents the graphene content (by weight %) in the graphene coating, and t is the coating thickness (μm). Graphene steel plate coatings that satisfy the conditions of equation (2) exhibit excellent dispersion stability, and therefore can possess excellent formability. On the other hand, in equation (2), when C... G 1 / 6 When the t value is greater than 32, the dispersion stability of graphene is poor and cracks may occur.

[0069] According to one specific embodiment of the present invention, even if other coatings are further included in addition to the graphene coating, excellent heat dissipation can still be achieved.

[0070] Furthermore, according to a specific embodiment of the present invention, even if other substances such as pigments are further contained within the graphene coating, it can still have excellent heat dissipation properties.

[0071] Furthermore, another specific embodiment of the present invention describes a method for manufacturing graphene-coated steel sheets.

[0072] More specifically, the process may include the following steps: providing a plated steel sheet with a coating formed on at least one side; applying the above-described solution composition to the coating; and drying the coated steel sheet.

[0073] The solution composition can be prepared by adding graphene, binder, physical property modifier and additive to a solvent in their respective proportions and then stirring.

[0074] When the composition of the present invention is coated onto the steel plate in a solution state, commonly used coating methods can be applied, and therefore there are no particular limitations.

[0075] For example, one of the following methods can be selected for the coating process: bar coating, roller coating, spraying, dipping, spray extrusion, deposition extrusion, etc., but there are no particular limitations.

[0076] The drying process for the steel sheet coated with the composition can be carried out in a temperature range of 40-280°C, based on the final reach temperature (PMT) of the material (steel sheet).

[0077] When the final temperature reached based on the material is below 40°C, a robust film structure is not formed sufficiently, posing a risk of reduced corrosion resistance and resistance to blackening. On the other hand, when the temperature exceeds 280°C, the film hardness increases excessively, leading to decreased corrosion resistance in the processed areas and potentially causing surface quality deterioration due to excessive heat, such as yellowing.

[0078] The steel plate that has undergone the drying process can have a coating with a thickness of 0.1-30 μm after drying.

[0079] In this invention, the means for performing the drying process are not particularly limited. It is hereby stated that equipment such as induction ovens or hot air drying ovens can be used, and the conditions of these devices can follow conventional conditions. Detailed Implementation

[0080] Example The present invention will now be described in more detail through embodiments. However, these embodiments are merely illustrative of implementation of the invention and are not intended to limit the invention. This is because the scope of the invention is determined by the matters set forth in the claims and those reasonably deduced therefrom.

[0081] 1. Experiment Example 1 (Heat Dissipation Performance Experiment) (1) Manufacturing of graphene-coated steel sheets Graphene was mixed with binders and additives at the weights specified in Table 1 below to prepare a graphene coating solution. The weight ratio of binders to additives added to the graphene coating solution, excluding graphene, was 8:2.

[0082] The prepared graphene coating solution was coated onto 0.5t to 2.0t hot-dip galvanized steel sheets and dried to manufacture graphene-coated steel sheets with coating thicknesses as shown in Table 1 below.

[0083] As an adhesive, a copolymer of solvent-free ethylene acrylate (EAA) and polyethylene (PE) containing approximately 2% by weight of trimethoxysilane (TMOS) as a side chain is used, and a copolymer of solvent-free EAA and PU is used, which are two resins mixed in a 4:1 weight ratio.

[0084] Titanium diethylene glycol propylene glycol triethanolamine complexes are used as an additive.

[0085] (2) Heat dissipation experiment In an environment where the ambient temperature is maintained at 23-25℃, a hole is drilled in the upper part of an insulated box with a built-in heat source, and a coated test piece with a size of 200mm×200mm is placed. The test piece is then placed in this position and the area around the test piece is sealed.

[0086] A power source was applied to the test piece and maintained for more than 2 hours to measure the temperature change until the temperature inside the steel plate and the insulation chamber remained constant. When the temperature remained constant, the temperature difference between the inside and outside of the chamber was measured and shown in Table 1 below.

[0087] Furthermore, when the equilibrium temperature difference of Comparative Example 1 is T1 and the equilibrium temperature difference of each coated steel plate is T2, the heat dissipation effect is calculated as (T1-T2) / T1×100%, and is shown in Table 1 below.

[0088] (3) Measurement of graphene area The measured photographs were taken 10 times using an optical microscope at 500x magnification. The average percentage of graphene in the total area of ​​the photographs was measured using an image analyzer and is shown in Table 1 below.

[0089] Furthermore, the values ​​measured according to the following formula (1) are shown in Table 1 below.

[0090] [Equation (1)] CG ·t≥0.71 (In the above formula (1), C) G t represents the graphene content (by weight %) in the graphene coating, and t is the coating thickness (μm). [Table 1] Referring to Table 1, it can be confirmed that the steel plates of Examples 1 to 36, with a graphene area ratio of 10% or more, have a heat dissipation effect.

[0091] However, it can be confirmed that the heat dissipation effect of Comparative Examples 1 to 7, where the graphene area ratio is less than 10%, is minimal.

[0092] 2. Experiment Example 2 (Heat dissipation performance experiment in coated steel sheet with multiple layers of coating) (1) Manufacturing of graphene-coated steel sheets with multi-layer coating A graphene coating solution was prepared, wherein the graphene coating solution was based on a solid content of 100% by weight, with graphene accounting for 2% by weight, and the remaining 98% by weight being a graphene coating solution prepared by mixing the adhesive and additives used in Experimental Example 1 in an 8:2 ratio.

[0093] A top coating solution is prepared, wherein the top coating solution does not contain graphene, and a polyester resin and a melamine-based curing agent are mixed in a 1:1 weight ratio to achieve a solid content of about 35% by weight.

[0094] A coating solution for undercoating is prepared, the coating solution for undercoating does not contain graphene, and a silane coupling agent and an ammonium phosphate salt are mixed in a 1:1 weight ratio to make the solid content about 5% by weight.

[0095] A graphene-coated steel sheet with a thickness of 0.5t to 2.0t is sequentially coated with a lower coating solution, a graphene coating solution, and an upper coating solution, and then dried to produce a graphene-coated steel sheet with a graphene coating thickness of 5μm and the upper and lower coatings having the thicknesses shown in Table 2 below.

[0096] (2) Heat dissipation experiment The heat dissipation effect of each graphene-coated steel plate was measured using the same method as in the heat dissipation experiment of Experiment Example 1, and the results are shown in Table 2.

[0097] [Table 2] Referring to Examples 37 to 44, it can be confirmed that the heat dissipation effect of the coated steel plate containing graphene coating is substantially the same even if there is a coating without graphene on the upper or lower layer of the graphene coating.

[0098] 3. Experiment Example 3 (including the heat dissipation performance experiment in a coated steel sheet containing pigment) (1) Manufacturing of graphene-coated steel sheets including multi-layer coatings According to Table 3 below, an inorganic pigment containing titanium dioxide and carbon black in a 1:1 weight ratio, graphene, the binder of Experimental Example 1, and the additive of Experimental Example 1 were mixed to prepare a graphene coating solution. The binder and additive were added to the graphene coating solution at a weight ratio of 8:2, excluding the inorganic pigment and graphene.

[0099] The prepared graphene coating solution was used to manufacture a graphene-coated steel sheet in the same manner as in Experimental Example 1.

[0100] (2) Heat dissipation experiment The heat dissipation effect of each graphene-coated steel plate was measured using the same method as in the heat dissipation experiment of Experiment Example 1, and the results are shown in Table 3.

[0101] [Table 3] Referring to Table 3, it can be confirmed that the graphene-coated steel plate layer containing pigments exhibits excellent heat dissipation and is not significantly affected by the pigment content. On the other hand, it can be confirmed that the coated steel plate, even if it contains pigments but not graphene, has poor heat dissipation.

Claims

1. A graphene-coated steel sheet, comprising: Coated steel sheet; as well as A graphene coating, wherein the graphene coating is disposed on the plated steel plate and comprises graphene. The graphene content is 0.1-30% by weight, based on the total weight of the graphene coating. The average distribution area of ​​the graphene coating per unit area, i.e., per 0.1mm × 0.1mm graphene particles, is more than 10%.

2. The graphene-coated steel plate according to claim 1, wherein, The coated steel sheet is selected from at least one of galvanized steel sheet, zinc alloy coated steel sheet, aluminized steel sheet, aluminum alloy coated steel sheet, cold-rolled steel sheet, and hot-rolled steel sheet.

3. The graphene-coated steel plate according to claim 1, wherein, The graphene coating contains an adhesive.

4. The graphene-coated steel plate according to claim 3, wherein, The adhesive is two or more acrylic resins.

5. The graphene-coated steel plate according to claim 3, wherein, The two or more acrylic resins are selected from two or more of the following: copolymers of ethylene acrylate (EAA) and polyethylene (PE), copolymers of ethylene acrylate (EAA) and polyurethane (PU), polymethyl methacrylate, polyacrylonitrile, cyclohexyl acrylate, glycidyl acrylate, and hydroxyalkyl acrylate.

6. The graphene-coated steel sheet according to claim 4, wherein, The adhesive further comprises at least one selected from epoxy resins, urethane resins, fluoropolymers, polyester resins, polyvinyl chloride resins, and vinyl chloride resins.

7. The graphene-coated steel sheet according to claim 6, wherein, The epoxy resin is selected from at least one of bisphenol A type resin, bisphenol F type resin, phenolic varnish resin, acrylic modified epoxy resin, alicyclic resin and glycidylamine type resin.

8. The graphene-coated steel sheet according to claim 6, wherein, The urethane-based resin is at least one selected from isophorone diisocyanate, adipic acid and polyols to prepare polyurethane, acrylic polyol and polyisocyanate.

9. The graphene-coated steel sheet according to claim 6, wherein, The fluoropolymer resin is a fluoropolymer polyurethane resin obtained using perfluoroalkyl alcohols, perfluoroacrylate polyols, fluorinated polyolefin polyols, or mixtures thereof, or is at least one selected from polymethyl α-fluoroacrylate, block poly-α-fluoroacrylate, polyethyl-α-fluoroacrylate, and polyfluoroalkyl acrylate.

10. The graphene-coated steel sheet according to claim 1, wherein, The graphene coating further includes additives.

11. The graphene-coated steel sheet according to claim 10, wherein, The additive is selected from at least one of titanium-based compounds, ammonium phosphates, vanadium-based compounds, organic phosphoric acid, ammonium phosphates, organic acids, leveling agents, wetting agents, curing agents, and defoamers.

12. The graphene-coated steel sheet according to claim 1, wherein, The graphene-coated steel plate satisfies the following formula (1): [Equation (1)] C G ·t≥0.71 In the above equation (1), C G t represents the graphene content in the graphene coating, expressed as a percentage by weight (%), and t represents the coating thickness, expressed as a micrometer (μm).

13. The graphene-coated steel sheet according to claim 1, wherein, The graphene-coated steel plate satisfies the following equation (2): [Equation (2)] C G 1 / 6 ·t≤32 In equation (2), C G t represents the graphene content in the graphene coating, expressed as a percentage by weight (%), and t represents the coating thickness, expressed as a micrometer (μm).

14. The graphene-coated steel sheet according to claim 1, wherein, The thickness of the graphene coating is 0.1-30 μm.

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