Fluorine coating agent having excellent abrasion resistance and antibacterial properties

Abstract

The present invention relates to a fluorine coating agent having excellent abrasion resistance and antibacterial properties. In an embodiment, the fluorine coating agent comprises: a primer coating composition comprising 25-40 weight% of a fluorine-based resin, 15-35 weight% of polyethersulfone, 1-10 weight% of titanium dioxide, 1-10 weight% of zirconium oxide, 0.1-5 weight% of cellulose, and 15-35 weight% of a solvent; and 40-70 weight% of a fluorine-based resin, 1-10 weight% of fluorphlogopite, 1-10 weight% of glass flake, 0.001-5 weight% of metal oxide, 0.1-5 weight% of chitosan, and 5-45 weight% of a solvent.

Description

Fluorine coating with excellent wear resistance and antibacterial properties

[0001] The present invention relates to a fluorine coating agent having excellent wear resistance and antibacterial properties.

[0002]

[0003] Fluorine coatings can be applied to a variety of applications that fundamentally require water-repellent properties, but are particularly useful for kitchenware, such as frying pans and pots. Meanwhile, the application of fluorine coatings to kitchenware requires heat and wear resistance. To meet these requirements, polymer resins such as polyamide-imide (PAI), polyethersulfone (PES), and polyether ether ketone (PEEK), as well as inorganic materials such as silicon carbide, titanium dioxide, and ceramics, may be considered.

[0004] Fluorine coatings typically use polytetrafluoroethylene (PTFE) as the main raw material, and PTFE is widely used as a coating for kitchenware because it has heat and chemical resistance. In general, in order to apply a fluorine coating composed of PTFE to kitchenware, the coating is combined with additives such as the above-mentioned inorganic materials, and is coated in at least two layers (primer, top coat) or at most three layers (primer, mid coat, top coat) in that order. However, in such cases, there is a possibility that peeling may occur between each coating layer, or the wear resistance and durability of the coating layer may be weak due to the characteristics of the fluorine coating, which may shorten the lifespan of the final product.

[0005] These problems were overcome by creating a copolymer of PTFE, the main raw material for fluorine coatings, and adding thermosetting acrylic resin. Furthermore, the addition of inorganic materials such as metals and ceramics was used to enhance the wear resistance and durability of the outermost coating layer.

[0006] However, even when a fluorine-based coating composition and an added organic or inorganic coating composition are mixed as described above, the advantages of each composition are not highlighted, but rather, the individual compositions are not combined, causing cracks in the coating layer during the drying process and ultimately causing peeling of the coating layer, resulting in a problem of reduced wear resistance.

[0007] Background technology related to the present invention is disclosed in Korean Patent Publication No. 2024-0001909 (published on January 4, 2024, title of the invention: Method for producing a coating agent containing fluorine and ceramic).

[0008]

[0009] One object of the present invention is to provide a fluorine coating agent having excellent wear resistance and antibacterial properties.

[0010] Another object of the present invention is to provide a fluorine coating agent having excellent adhesion and no interlayer peeling due to electrochemical bonding between the lower layer and the upper layer.

[0011] Another object of the present invention is to provide a fluorine coating agent having excellent appearance, chemical resistance, durability and antifouling properties.

[0012] Another object of the present invention is to provide a fluorine coating agent having excellent mixing properties, dispersibility, and formulation stability.

[0013] Another object of the present invention is to provide a method for manufacturing a molded body using the fluorine coating agent.

[0014] Another object of the present invention is to provide a molded article manufactured using the above fluorine coating agent.

[0015]

[0016] One aspect of the present invention relates to a fluorine coating agent.

[0017] 1. In one specific example, the fluorine coating agent comprises a primer coating composition comprising 25 to 40 wt% of a fluorine-based resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of a solvent; and 40 to 70 wt% of a fluorine-based resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of a metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent, wherein the metal oxide comprises at least one of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O).

[0018] 2. In 1, the fluorine-based resin may include at least one of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

[0019] 3. In 1-2, the cellulose and chitosan may each have an average size of 0.01 to 1 μm.

[0020] 4. In 1-3, the cellulose and chitosan may each be spherical, ellipsoidal, fibrous, flake-shaped or irregular in shape.

[0021] 5. In 1-4, the above-mentioned undercoat composition may further include at least one of 0.1 to 5 wt% of pigment and 1 to 10 wt% of carbon black based on the total weight.

[0022] 6. In 1-5, the above-mentioned undercoat composition may contain polyethersulfone and fluorine-based resin in a weight ratio of 1:0.8 to 1:3.

[0023] 7. In 1-6, the above-mentioned coating composition may contain fluorphlogopite and glass flakes in a weight ratio of 1:1 to 1:3.

[0024] 8. In 1-7, the above-mentioned undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:2 to 1:8.

[0025] Another aspect of the present invention relates to a method for manufacturing a molded article using the above fluorine coating agent.

[0026] 9. In one specific example, the method for manufacturing a molded body includes the steps of forming a bottom coating layer by applying and drying a bottom coating composition on at least one surface of a metal substrate; And a step of forming a top coating layer by applying and drying a top coating composition on one surface of the bottom coating layer; wherein the bottom coating composition includes 25 to 40 wt% of a fluorinated resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of a solvent, and the top coating composition includes 40 to 70 wt% of a fluorinated resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of a metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent, wherein the metal oxide is copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO). and silver oxide (Ag2O).

[0027] Another aspect of the present invention relates to a molded body manufactured using the above fluorine coating agent.

[0028] 10. In one specific example, the molded body comprises: a metal substrate; a lower coating layer formed on at least one surface of the metal substrate; And a top coating layer formed on one surface of the bottom coating layer; wherein the bottom coating layer is formed from a bottom coating composition including 25 to 40 wt% of a fluorinated resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of a solvent, and the top coating layer includes 40 to 70 wt% of a fluorinated resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of a metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent, wherein the metal oxide is copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and It is formed from a top coating composition containing at least one silver oxide (Ag2O).

[0029]

[0030] The fluorine coating agent according to the present invention has excellent wear resistance and antibacterial properties, excellent adhesion due to electrochemical bonding between the lower layer and the upper layer, no delamination between layers, excellent appearance quality, no surface defects, excellent chemical resistance, durability and antifouling properties, and excellent mixing, dispersibility and formulation stability of the upper and lower coating compositions.

[0031]

[0032] Figure 1 is a scanning electron microscope (SEM) photograph of Example 1.

[0033]

[0034] In describing the present invention, if it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

[0035] And the terms described below are terms defined in consideration of their functions in the present invention, and may vary depending on the intention or custom of the user or operator, so their definitions should be made based on the contents throughout this specification explaining the present invention.

[0036]

[0037] Fluorine coating agent

[0038] One aspect of the present invention relates to a fluorine coating agent. In one specific example, the fluorine coating agent comprises a primer coating composition comprising 25 to 40 wt% of a fluorine-based resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of a solvent; and 40 to 70 wt% of a fluorine-based resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of a metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent.

[0039] Hereinafter, the components of the above fluorine coating agent will be described in more detail.

[0040]

[0041] Undercoat composition

[0042] The above-mentioned undercoat composition comprises 25 to 40 wt% of fluorinated resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of solvent.

[0043]

[0044] fluorinated resin

[0045] In one specific example, the fluorinated resin may include one or more of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

[0046] In one specific example, the fluorine-based resin is included in an amount of 25 to 40 wt% based on the total weight of the undercoat composition. When the fluorine-based resin is included in an amount of less than 25 wt%, the mixing and dispersibility of the undercoat composition may deteriorate, and the adhesion, durability, or abrasion resistance of the undercoat layer may deteriorate. When the fluorine-based resin is included in an amount of more than 40 wt%, the durability or abrasion resistance of the undercoat layer may deteriorate. For example, the fluorine-based resin may be included in an amount of 25 to 35 wt%, 28 to 35 wt%, or 30 to 35 wt%. For example, the fluorine-based resin may be included in an amount of 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 wt% based on the total weight of the undercoat composition.

[0047]

[0048] polyethersulfone

[0049] The above polyethersulfone may be included to improve heat resistance.

[0050] In one specific example, the polyethersulfone is included in an amount of 15 to 35 wt% based on the total weight of the undercoat composition. If the polyethersulfone is included in an amount of less than 15 wt%, the heat resistance of the undercoat layer may deteriorate, and if the polyethersulfone is included in an amount of more than 35 wt%, the mixing and dispersibility of the undercoat composition may deteriorate, and the abrasion resistance of the undercoat layer may deteriorate. For example, the polyethersulfone may be included in an amount of 15 to 30 wt%, 20 to 30 wt%, or 25 to 30 wt%. For example, the polyethersulfone may be included in an amount of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 or 35 wt% based on the total weight of the undercoat composition.

[0051] In one specific example, the undercoat composition may contain polyethersulfone and a fluorine-based resin in a weight ratio of 1:0.8 to 1:3. When contained under the above weight ratio conditions, the composition has excellent mixing and dispersibility, the durability, wear resistance, and heat resistance of the undercoat layer are excellent, and the occurrence of surface defects such as cracks can be prevented, thereby providing an excellent appearance. For example, the undercoat composition may contain polyethersulfone and a fluorine-based resin in a weight ratio of 1:0.8 to 1:2.5, a weight ratio of 1:0.8 to 1:2, or a weight ratio of 1:1 to 1:1.5.

[0052]

[0053] zirconium oxide

[0054] The above zirconium oxide (ZrO2) may be included to improve the chemical resistance and antifouling properties of the undercoat layer.

[0055] In one specific example, the zirconium oxide may be spherical, ellipsoidal, needle-shaped, polyhedral or irregular.

[0056] In one specific example, the zirconium oxide may have an average size of 0.01 to 50 μm. The size may refer to the maximum length or diameter of the zirconium oxide. Under the above conditions, the zirconium oxide may exhibit excellent mixing and dispersibility.

[0057] In one specific example, the zirconium oxide is included in an amount of 1 to 10 wt% based on the total weight of the undercoat composition. When the zirconium oxide is included in an amount of less than 1 wt%, the chemical resistance and antifouling properties of the undercoat layer may deteriorate, and when the zirconium oxide is included in an amount of more than 10 wt%, the mixing and dispersibility of the undercoat composition may deteriorate. For example, the zirconium oxide may be included in an amount of 1 to 8 wt%, 1 to 5 wt%, or 2 to 5 wt%. For example, the zirconium oxide may be included in an amount of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt% based on the total weight of the undercoat composition.

[0058]

[0059] titanium dioxide

[0060] The above titanium dioxide (TiO2) may be included to improve the durability and wear resistance of the undercoat layer.

[0061] In one specific example, the titanium dioxide may be spherical, ellipsoidal, needle-shaped, polyhedral or irregular.

[0062] In one specific example, the titanium dioxide may have an average size of 0.01 to 50 μm. The size may refer to the maximum length or diameter of the titanium dioxide. Under the above conditions, the titanium dioxide may exhibit excellent mixing and dispersibility.

[0063] In one specific example, the titanium dioxide is included in an amount of 1 to 10 wt% based on the total weight of the undercoat composition. If the titanium dioxide is included in an amount of less than 1 wt%, the durability and wear resistance of the undercoat layer may deteriorate, and if the titanium dioxide is included in an amount of more than 10 wt%, the mixing and dispersibility of the undercoat composition may deteriorate. For example, the titanium dioxide may be included in an amount of 1 to 8 wt%, 1 to 5 wt%, or 3 to 5 wt%. For example, the titanium dioxide may be included in an amount of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt% based on the total weight of the undercoat composition.

[0064]

[0065] cellulose

[0066] The above cellulose is included for the purpose of improving interfacial adhesion, preventing peeling between coating layers, and improving wear resistance.

[0067] For example, the cellulose can be prepared as a suspension having a concentration of 0.1 to 10 wt% and micronized using an underwater opposing impactor. Micronizing the cellulose increases its specific surface area, thereby maximizing the electrochemical bonding between the undercoat layer and the topcoat layer.

[0068] In one specific example, the cellulose may be in the form of fibers or needles.

[0069] In one specific example, the cellulose may have an average size (or diameter) of 0.01 to 1 μm. The size may refer to the maximum length of the cellulose. Under the above conditions, the cellulose may have excellent mixing and dispersibility. For example, the cellulose may have an average size of 0.05 to 3 μm or 0.1 to 1 μm.

[0070] In one specific example, the cellulose is included in an amount of 0.1 to 5 wt% based on the total weight of the undercoat composition. When the cellulose is included in an amount of less than 0.1 wt%, the interlayer adhesion of the undercoat layer may decrease, and when the cellulose is included in an amount of more than 5 wt%, the mixing and dispersibility of the composition may decrease, ultimately resulting in decreased wear resistance of the undercoat layer. For example, the cellulose may be included in an amount of 0.1 to 4 wt%, 0.1 to 3 wt%, or 0.5 to 1 wt%. For example, the cellulose may be included in an amount of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, or 5 wt% based on the total weight of the undercoat composition.

[0071] In one specific example, the undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:2 to 1:8. When contained under the above weight ratio conditions, the composition may have excellent mixing and dispersibility, excellent adhesion between coating layers, and excellent wear resistance and durability. For example, the undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:3 to 1:8, a weight ratio of 1:4 to 1:8, a weight ratio of 1:4 to 1:7, or a weight ratio of 1:5 to 1:7.

[0072]

[0073] solvent

[0074] The above solvent is included for the purpose of ensuring the mixing and dispersibility of the undercoat composition. In one specific example, the solvent may include one or more of water, an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent.

[0075] For example, the alcohol-based solvent may include one or more of ethanol, methanol, isopropyl alcohol, and butanol.

[0076] For example, the aromatic hydrocarbon solvent may include one or more of benzene, toluene, and xylene.

[0077] For example, the ketone solvent may include methyl isobutyl ketone.

[0078] In one specific example, the solvent is included in an amount of 15 to 35 wt% based on the total weight of the undercoat composition. If the solvent is included in an amount of less than 15 wt%, the mixing and dispersibility of the composition may deteriorate, and if the solvent is included in an amount of more than 35 wt%, the drying time of the undercoat layer may be prolonged, which may deteriorate workability or cause defects in the undercoat layer, which may deteriorate the appearance. For example, the solvent may be included in an amount of 15 to 30 wt%, 20 to 30 wt%, or 20 to 25 wt%. For example, the solvent may be included in an amount of 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, or 35 wt% based on the total weight of the undercoat composition.

[0079]

[0080] In one specific example, the undercoat composition may further include at least one of 0.1 to 5 wt% of pigment and 1 to 10 wt% of carbon black based on the total weight.

[0081]

[0082] pigment

[0083] The above pigment may include at least one of an organic pigment and an inorganic pigment. For example, the above organic pigment may include at least one of color index (CI) pigment yellow, CI pigment brown, CI pigment orange, CI pigment yellow, CI pigment blue, CI pigment green, and CI pigment red.

[0084] For example, the inorganic pigment may include one or more of perylene red, manganese ferrite black, copper chromite black, bismuth vanadate, iron hydroxide yellow, chromium oxide green, and cobalt aluminate blue.

[0085] In one specific example, the pigment may be included in an amount of 0.1 to 5 wt% based on the total weight of the undercoat composition. When included in the above range, the mixing and dispersing properties may be excellent, and the appearance of the undercoat layer may be excellent. For example, the pigment may be included in an amount of 0.1 to 4 wt%, 0.5 to 3 wt%, or 1 to 2 wt%. For example, the pigment may be included in an amount of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, or 5 wt% based on the total weight of the undercoat composition.

[0086]

[0087] carbon black

[0088] The carbon black may be a conventional one. In one specific example, the carbon black may be included in an amount of 1 to 10 wt% based on the total weight of the undercoat composition. When included in the above range, the mixing and dispersing properties may be excellent, and the appearance of the undercoat layer may be excellent. For example, the carbon black may be included in an amount of 1 to 7 wt%, 1 to 5 wt%, or 3 to 5 wt%. For example, the carbon black may be included in an amount of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt% based on the total weight of the undercoat composition.

[0089]

[0090] Topcoat composition

[0091] The above-mentioned coating composition comprises 40 to 70 wt% of fluorine-based resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of solvent.

[0092]

[0093] fluorinated resin

[0094] In one specific example, the fluorinated resin may include one or more of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

[0095] In one specific example, the fluorinated resin is included in an amount of 40 to 70 wt% based on the total weight of the topcoat composition. If the fluorinated resin is included in an amount of less than 40 wt%, the mixing and dispersibility of the topcoat composition may deteriorate, and the hydrophobicity and abrasion resistance of the topcoat layer may deteriorate. If the fluorinated resin is included in an amount of more than 70 wt%, the durability or abrasion resistance of the topcoat layer may deteriorate. For example, the fluorinated resin may be included in an amount of 45 to 70 wt%, 55 to 70 wt%, 60 to 70 wt%, or 60 to 65 wt%. For example, the fluorine-based resin may be included in an amount of 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69 or 70 wt% based on the total weight of the topcoat composition.

[0096]

[0097] Fluorphlogopite

[0098] The above fluorophlogopite is included to control the viscosity and improve the durability of the above-mentioned coating composition.

[0099] In one specific example, the fluorophlogopite is included in an amount of 1 to 10 wt% based on the total weight of the topcoat composition. When the fluorophlogopite is included in an amount of less than 1 wt%, it is difficult to control the viscosity of the topcoat composition, thereby reducing the dispersibility and workability of the composition and deteriorating the durability of the topcoat layer. When the fluorophlogopite is included in an amount of more than 10 wt%, the mixing and dispersibility of the composition may be reduced, and surface defects of the topcoat layer may occur or the wear resistance may be reduced. For example, the fluorophlogopite may be included in an amount of 1 to 8 wt%, 1 to 7 wt%, or 1 to 5 wt% based on the total weight of the topcoat composition. For example, the fluorophlogopite may be included in an amount of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt% based on the total weight of the topcoat composition.

[0100]

[0101] glass flakes

[0102] In one specific example, the glass flakes may have an average size of 0.01 to 20 μm. The size may refer to the maximum length or diameter of the glass flakes. Under the above conditions, the glass flakes may exhibit excellent mixing and dispersibility. For example, the glass flakes may have an average size of 1 to 10 μm.

[0103] In one specific example, the glass flakes are included in an amount of 1 to 10 wt% based on the total weight of the topcoat composition. When the glass flakes are included in an amount of less than 1 wt%, the durability and wear resistance of the topcoat layer may deteriorate, and when the glass flakes are included in an amount of more than 10 wt%, the mixability and dispersibility of the topcoat composition may deteriorate, and surface defects of the topcoat layer may occur, thereby deteriorating the wear resistance. For example, the glass flakes may be included in an amount of 1 to 8 wt%, 1 to 7 wt%, or 1 to 5 wt%. For example, the glass flakes may be included in an amount of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt% based on the total weight of the topcoat composition.

[0104] In one specific example, the topcoat composition may contain fluorophlogopite and glass flakes in a weight ratio of 1:1 to 1:3. When contained under the above weight ratio conditions, the composition has excellent mixing and dispersibility, easy viscosity control, excellent durability and wear resistance of the topcoat layer, and can prevent the occurrence of surface defects such as cracks, thereby providing an excellent appearance. For example, the topcoat composition may contain fluorophlogopite and glass flakes in a weight ratio of 1:1 to 1:2.5, a weight ratio of 1:1 to 1:2, or a weight ratio of 1:1 to 1:1.5.

[0105]

[0106] filler

[0107] In one specific example, the above coating composition may further comprise a filler.

[0108] In one specific example, the filler may be spherical, ellipsoidal, needle-shaped, fibrous, flake-shaped or irregular.

[0109] In one specific example, the filler may have an average size of 0.01 to 20 μm. The size may refer to the maximum length or diameter of the filler. Under the above conditions, the composition may have excellent mixing and dispersibility.

[0110] For example, the filler may include one or more of talc, boron nitride, mica, calcium carbonate, alumina, and silica.

[0111] In one specific example, the filler may be included in an amount of 0.1 to 15 wt% based on the total weight of the topcoat composition. Under the above conditions, the composition may have excellent mixing and dispersibility, and the appearance, durability, and wear resistance of the topcoat layer may be excellent. For example, the filler may be included in an amount of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15 wt% based on the total weight of the topcoat composition.

[0112]

[0113] metal oxides

[0114] The above metal oxide is included for the purpose of securing antibacterial properties and wear resistance of the above coating layer.

[0115] In one specific example, the metal oxide may include one or more of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O). When the metal oxide is included, antibacterial properties and wear resistance may be excellent.

[0116] In one specific example, the metal oxide is contained in an amount of 0.001 to 5 wt% based on the total weight of the topcoat composition. If the metal oxide is contained in an amount of less than 0.001 wt%, it is difficult to secure antibacterial properties of the topcoat layer, and electrochemical bonding with chitosan in the bottomcoat layer is insufficient, resulting in reduced wear resistance. If the metal oxide is contained in an amount exceeding 5 wt%, the mixing and dispersibility of the topcoat composition may be reduced, and durability and wear resistance may be reduced due to defects resulting from aggregation in the topcoat layer. For example, the metal oxide may be contained in an amount of 0.005 to 4 wt%, 0.01 to 3 wt%, 0.01 to 1 wt%, or 0.01 to 0.5 wt%. For example, the metal oxide may be included in an amount of 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, or 5 wt% based on the total weight of the topcoat composition.

[0117]

[0118] chitosan

[0119] The above chitosan is included for the purpose of securing interlayer adhesion between the top coating layer and the bottom coating layer and antibacterial properties of the top coating layer.

[0120] The present invention can prevent peeling between coating layers and improve the wear resistance of the top coat by applying cellulose and chitosan, which are natural polymers with different charges, to the lower coating layer and the upper coating layer, respectively, thereby improving the interfacial adhesiveness.

[0121] Although electrochemical bonding can be induced by adding metal oxides or inorganic materials to improve the interfacial adhesion between the undercoat and topcoat layers, there is a possibility that problems due to inhalation may occur if the coating layer is peeled off during use by the end user in the future. Therefore, the present invention aims to solve the aforementioned problems and improve the interfacial adhesion between the undercoat and topcoat layers by using natural polymers such as cellulose and chitosan. Cellulose is the most abundant natural polymer on earth and has a tensile strength very similar to that of glass fiber and carbon fiber. In addition, it also has properties such as biodegradability and biocompatibility, so it can solve the problem of peeling of metal oxides or inorganic materials.

[0122] Chitosan is derived from chitin, the second most abundant natural polymer on Earth after cellulose, and is obtained through the deacetylation of chitin. Chitin and chitosan share a chemical structure very similar to cellulose, and share similar mechanical properties, biodegradability, and biocompatibility with cellulose.

[0123] In general, since cellulose without chemical modification has an anion and chitosan has a cation, in the present invention, cellulose was used as an additive in the lower coating composition and chitosan was used as an additive in the upper coating composition to maximize the interlocking effect through electrochemical bonding of the lower coating layer and the upper coating layer, thereby preventing the peeling phenomenon of the lower coating layer and the upper coating layer.

[0124] In one specific example, the cellulose and chitosan may be prepared as suspensions each having a concentration of 0.1 to 10 wt% and micronized using an underwater opposing impactor. Micronization of the cellulose and chitosan increases the specific surface area, thereby maximizing the electrochemical bonding between the undercoat layer and the topcoat layer.

[0125] Additionally, chitosan also has antibacterial properties due to its amine group. To maximize the antibacterial properties of the topcoat layer, metal oxides were added. The metal oxides not only maximize the antibacterial properties of the topcoat layer, but also improve its wear resistance. Therefore, the surface coated with the base coat and topcoat layers composed of the fluorine coating agent and each additive has wear resistance and antibacterial properties, and can prevent the coating layer from peeling, thereby extending the life of the coating layer.

[0126] In one specific example, the chitosan may be in a fibrous or needle-like form.

[0127] In one specific example, the chitosan may have an average size of 0.01 to 1 μm. The size may refer to the maximum length or diameter of the chitosan. Under the above conditions, the chitosan may exhibit excellent mixing and dispersibility. For example, the chitosan may have an average size of 0.05 to 3 μm or 0.1 to 1 μm.

[0128] In one specific example, the chitosan is included in an amount of 0.1 to 5 wt% based on the total weight of the topcoat composition. When the chitosan is included in an amount of less than 0.1 wt%, the interlayer adhesion and antibacterial properties of the topcoat layer may deteriorate, and when the chitosan is included in an amount of more than 5 wt%, the mixing properties, dispersibility, and surface roughness of the composition may deteriorate, and the abrasion resistance of the bottomcoat layer may deteriorate. For example, the chitosan may be included in an amount of 0.1 to 4 wt%, 0.1 to 3 wt%, or 0.5 to 1 wt%. For example, the chitosan may be included in an amount of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, or 5 wt% based on the total weight of the topcoat composition.

[0129]

[0130] solvent

[0131] The above solvent is included for the purpose of ensuring the mixing and dispersibility of the topcoat composition. In one specific example, the solvent may include one or more of water, an alcohol-based solvent, an aromatic hydrocarbon-based solvent, and a ketone-based solvent.

[0132] For example, the alcohol-based solvent may include one or more of ethanol, methanol, isopropyl alcohol, and butanol.

[0133] For example, the aromatic hydrocarbon solvent may include one or more of benzene, toluene, and xylene.

[0134] For example, the ketone solvent may include methyl isobutyl ketone.

[0135] In one specific example, the solvent is included in an amount of 5 to 45 wt% based on the total weight of the topcoat composition. If the solvent is included in an amount of less than 5 wt%, the mixing and dispersibility of the composition may deteriorate, and if the solvent is included in an amount of more than 45 wt%, the drying time of the topcoat layer may be prolonged, which may deteriorate workability or cause defects in the topcoat layer, which may deteriorate the appearance. For example, the solvent may be included in an amount of 10 to 40 wt%, 15 to 35 wt%, 20 to 35 wt%, or 25 to 30 wt%. For example, the solvent may be included in an amount of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44 or 45 wt% based on the total weight of the topcoat composition.

[0136]

[0137] Method for manufacturing a molded body using a fluorine coating agent

[0138] Another aspect of the present invention relates to a method for manufacturing a molded article using the fluorine coating agent. In one specific example, the method for manufacturing a molded article comprises the steps of (S10) applying and drying a primer coating composition to at least one surface of a metal substrate to form a primer coating layer; and (S20) applying and drying a top coating composition to one surface of the primer coating layer to form a top coating layer.

[0139] The above-mentioned undercoat composition comprises 25 to 40 wt% of fluorinated resin, 1 to 10 wt% of zirconium oxide, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of a solvent, and the above-mentioned topcoat composition comprises 40 to 70 wt% of fluorinated resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent.

[0140] The present invention provides a method for preparing a coating composition comprising a fluorine-based resin as a main component and cellulose added thereto and a coating composition comprising a fluorine-based resin as a main component and chitosan and a metal oxide added thereto, in order to prevent peeling from occurring through electrochemical bonding between a lower coating layer and a top coating layer on the surface of a metal substrate such as kitchenware, and to sequentially coat the lower coating composition and the upper coating composition to manufacture a molded body.

[0141] The above-mentioned undercoat composition and topcoat composition may be the same as those described above.

[0142] In one specific example, the undercoat composition may further include at least one of 0.1 to 5 wt% of pigment and 1 to 10 wt% of carbon black based on the total weight.

[0143] In one specific example, the undercoat composition may contain polyethersulfone and a fluorine-based resin in a weight ratio of 1:0.8 to 1:3. When contained under the above weight ratio conditions, the composition has excellent mixing and dispersibility, the durability, wear resistance, and heat resistance of the undercoat layer are excellent, and the occurrence of surface defects such as cracks can be prevented, thereby providing an excellent appearance. For example, the undercoat composition may contain polyethersulfone and a fluorine-based resin in a weight ratio of 1:0.8 to 1:2.5, a weight ratio of 1:0.8 to 1:2, or a weight ratio of 1:1 to 1:1.5.

[0144] In one specific example, the undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:2 to 1:8. When contained under the above weight ratio conditions, the composition may have excellent mixing and dispersibility, excellent adhesion between coating layers, and excellent wear resistance and durability. For example, the undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:3 to 1:8, a weight ratio of 1:4 to 1:8, a weight ratio of 1:4 to 1:7, or a weight ratio of 1:5 to 1:7.

[0145] In one specific example, the topcoat composition may contain fluorophlogopite and a filler in a weight ratio of 1:1 to 1:3. When contained under the above weight ratio conditions, the composition has excellent mixing and dispersibility, easy viscosity control, excellent durability and wear resistance of the topcoat layer, and can prevent the occurrence of surface defects such as cracks, thereby providing an excellent appearance. For example, the topcoat composition may contain fluorophlogopite and a filler in a weight ratio of 1:1 to 1:2 or a weight ratio of 1:1 to 1:1.5.

[0146] In the above step (S10), the metal substrate may include at least one of aluminum (Al), copper (Cu), magnesium (Mg), iron (Fe), and stainless steel. For example, the metal substrate may be formed by cold rolling or the like at a portion that comes into direct contact with a heat source, thereby forming unevenness on the surface of the portion that comes into direct contact with the heat source.

[0147] In one specific example, prior to applying the undercoat composition, the surface of the metal substrate to which the undercoat composition is to be applied may be pretreated by grinding with sandpaper. For example, the surface of the metal substrate may be pretreated by grinding with sandpaper. The pretreatment may improve the adhesion of the undercoat layer.

[0148] In one specific example, a primer coating composition may be applied to at least one surface of the metal substrate and dried at 100 to 350°C to form a primer coating layer. Under these conditions, the primer coating layer may have excellent appearance and durability. Specifically, drying at 180 to 250°C is preferred.

[0149] In one specific example, the undercoat layer may have a thickness of 1 to 50 μm. Under the above thickness conditions, the undercoat layer may have excellent adhesion, appearance, heat resistance, and durability. For example, the thickness may be 10 to 40 μm, 15 to 35 μm, or 20 to 30 μm.

[0150] In the above step (S20), a top coating composition may be applied to one surface of the lower coating layer and dried at 100 to 400°C to form a top coating layer. Under the above conditions, the top coating layer may have excellent appearance and durability. Specifically, drying at 200 to 350°C is preferable.

[0151] In one specific example, the topcoat layer may have a thickness of 1 to 40 μm. Under the above thickness conditions, the topcoat layer may have excellent adhesion, appearance, heat resistance, and durability. For example, the thickness may be 5 to 30 μm, 5 to 25 μm, 5 to 15 μm, or 10 to 15 μm.

[0152]

[0153] Molded body manufactured using fluorine coating agent

[0154] Another aspect of the present invention relates to a molded body manufactured by a method for manufacturing a molded body using the above fluorine coating agent or a molded body manufactured using the fluorine coating agent.

[0155] In one specific example, the molded body includes a metal substrate; a base coating layer formed on at least one surface of the metal substrate; and a top coating layer formed on one surface of the base coating layer, wherein the base coating layer is formed from a base coating composition comprising 25 to 40 wt% of a fluorinated resin, 1 to 10 wt% of zirconium oxide, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of a solvent, and the top coating layer is formed from a top coating composition comprising 40 to 70 wt% of a fluorinated resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of a metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent.

[0156] The above-mentioned undercoat composition and topcoat composition may be the same as those described above.

[0157] In one specific example, the undercoat composition may further include at least one of 0.1 to 5 wt% of pigment and 1 to 10 wt% of carbon black based on the total weight.

[0158] In one specific example, the topcoat composition may further include a filler. The filler is the same as described above, and the filler may be included in an amount of 0.1 to 15 wt% based on the total weight of the topcoat composition.

[0159] In one specific example, the undercoat composition may contain polyethersulfone and a fluorine-based resin in a weight ratio of 1:0.8 to 1:3. When contained under the above weight ratio conditions, the composition has excellent mixing and dispersibility, the durability, wear resistance, and heat resistance of the undercoat layer are excellent, and the occurrence of surface defects such as cracks can be prevented, thereby providing an excellent appearance. For example, the undercoat composition may contain polyethersulfone and a fluorine-based resin in a weight ratio of 1:0.8 to 1:2 or a weight ratio of 1:1 to 1:1.5.

[0160] In one specific example, the undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:2 to 1:8. When contained under the above weight ratio conditions, the composition may have excellent mixing and dispersibility, excellent adhesion between coating layers, and excellent wear resistance and durability. For example, the undercoat composition may contain cellulose and zirconium oxide in a weight ratio of 1:3 to 1:8, a weight ratio of 1:4 to 1:8, or a weight ratio of 1:5 to 1:7.

[0161] In one specific example, the topcoat composition may contain fluorophlogopite and a filler in a weight ratio of 1:1 to 1:3. When contained under the above weight ratio conditions, the composition has excellent mixing and dispersibility, easy viscosity control, excellent durability and wear resistance of the topcoat layer, and can prevent the occurrence of surface defects such as cracks, thereby providing an excellent appearance. For example, the topcoat composition may contain fluorophlogopite and a filler in a weight ratio of 1:1 to 1:2 or a weight ratio of 1:1 to 1:1.5.

[0162] The above metal substrate may include one or more of aluminum (Al), copper (Cu), magnesium (Mg), iron (Fe), and stainless steel.

[0163] The above-mentioned undercoat layer may include a fluorine-based resin, zirconium oxide, polyethersulfone, titanium dioxide, and cellulose. For example, the above-mentioned undercoat layer may further include one or more of a pigment and carbon black.

[0164] The above-mentioned coating layer may include a fluorine-based resin, fluorophlogopite, a filler, a metal oxide, and chitosan.

[0165] In one specific example, the undercoat layer may have a thickness of 1 to 50 μm. Under the above thickness conditions, the undercoat layer may have excellent adhesion, appearance, heat resistance, and durability. For example, the thickness may be 10 to 40 μm, 15 to 35 μm, or 20 to 30 μm.

[0166] In one specific example, the topcoat layer may have a thickness of 1 to 40 μm. Under the above thickness conditions, the topcoat layer may have excellent adhesion, appearance, heat resistance, and durability. For example, the thickness may be 5 to 30 μm, 5 to 25 μm, 5 to 15 μm, or 10 to 15 μm.

[0167] The above fluorine coating agent and the molded article manufactured using the same are not limited to coatings for kitchenware, and can be applied to various industrial fields such as plastics and steel.

[0168]

[0169] Hereinafter, the structure and operation of the present invention will be described in more detail through preferred embodiments. However, these are presented as preferred examples of the present invention and should not be construed as limiting the present invention in any way. Details not described herein are technically feasible to those skilled in the art, and therefore, their description will be omitted.

[0170]

[0171] Examples and Comparative Examples

[0172] The ingredients used in the examples and comparative examples are as follows.

[0173] (1) Sub-coating composition

[0174] (A) Fluorine resin: Polytetrafluoroethylene (PTFE) was used.

[0175] (B) Zirconium oxide with an average size of 1 to 10 μm was used.

[0176] (C) Polyethersulfone was used.

[0177] (D) Titanium dioxide (TiO2) with an average size of 1 to 10 μm was used.

[0178] (E) Pigment (CI pigment brown 24) was used.

[0179] (F) Carbon black was used.

[0180] (G) Cellulose: Cellulose was prepared as a suspension with a concentration of 2 wt% and refined using an underwater opposing impactor to prepare a suspension containing cellulose nanofibers having an average size of 0.01 to 1 μm.

[0181] (H) Solvent (water) was used.

[0182]

[0183] (2) Topcoat composition

[0184] (A) Fluorine resin: Polytetrafluoroethylene (PTFE) was used.

[0185] (B) Synthetic fluorphlogopite was used.

[0186] (C) Glass flakes: Glass flakes with an average size of 1 to 10 μm were used.

[0187] (D) Metal oxide: Zinc oxide (ZnO) was used.

[0188] (E) Chitosan: Chitosan, which is produced by deacetylating chitin using a conventional method, is prepared as a suspension having a concentration of 2 wt% and is then micronized using an underwater opposing collision device to produce a suspension containing chitosan nanofibers having an average size of 0.01 to 1 μm.

[0189] (F) Solvent (water) was used.

[0190]

[0191] Examples 1 to 4 and Comparative Examples 1 to 5

[0192] A primer coating composition according to the conditions in Table 1 below was applied to one surface of a metal substrate (stainless steel) and dried to form a primer coating layer having a thickness of approximately 20 μm. Then, a top coating composition according to the conditions in Table 1 below was applied to one surface of the primer coating layer and dried to form a top coating layer having a thickness of approximately 10 μm, thereby manufacturing a molded article (sum of the thicknesses of the primer coating layer and the top coating layer: approximately 30 μm). A cross-section of the molded article of Example 1 was analyzed using a scanning electron microscope (SEM) and is shown in Fig. 1 below.

[0193] Meanwhile, in Table 1 below, Comparative Example 5 forms upper and lower coating layers by applying a conventional fluorine resin.

[0194] [Table 1]

[0195]

[0196] Experimental example

[0197] (1) Miscibility: The miscibility and dispersibility were evaluated when manufacturing the undercoat composition and the topcoat composition of the examples and comparative examples, and the results are shown in Table 2 below (◎: excellent dispersibility, ○: very little dispersion or agglomeration, △: some components are misdispersed or agglomeration, X: severe misdispersion due to agglomeration and phase separation).

[0198] (2) Appearance: The appearance of the lower coating layer and the upper coating layer of the examples and comparative examples were observed with the naked eye to evaluate the presence of discoloration and cracking, and the results are shown in Table 2 below (◎: no cracks / discoloration, ○: very few cracks or discoloration, △: some cracks or discoloration X: severe cracks or discoloration).

[0199] (3) Adhesion: For the above examples and comparative examples, the adhesion between the metal substrate, the undercoat layer, and the topcoat layer was evaluated by a cross-cut tape peeling test according to JIS K 5400. The number of non-peeled cross-cuts was indicated for the total number of cross-cuts (100) formed in a size of 1.5 mm x 1.5 mm.

[0200] (4) Abrasion resistance: Abrasion resistance was measured for the above examples and comparative examples using an abrasion resistance tester, and the results are shown in Table 2 below. The abrasion resistance test can be analyzed by the number of times a steel wool reciprocates under a load of 1 kg. The abrasion resistance evaluation included all of the exposure of the substrate due to peeling of the outermost coating layer, peeling between the undercoat layer and the topcoat layer, and peeling of the entire coating layer caused by repeated external forces.

[0201] [Table 2]

[0202]

[0203] Meanwhile, Comparative Example 5 in Table 2 above is the result of evaluating the mixing properties, appearance properties, and wear resistance of a molded body manufactured by forming a coating layer using a conventional fluorine resin using the same method as Example 1.

[0204] Referring to the results in Table 2 above, Examples 1 to 4 of the present invention had excellent mixing and dispersibility of the composition compared to Comparative Examples 1 to 4 in which the content of the components of the present invention was outside the range or some components were not applied, and Comparative Example 5 in which a conventional fluorine-based resin was applied, and it was found that surface defects of the lower coating layer and the upper coating layer did not occur, resulting in an excellent appearance, and excellent wear resistance between the coating layers.

[0205] In the case of the above comparative examples 1 to 4, it was found that if the electrochemical bonding of cellulose and chitosan was insufficient or if cellulose and chitosan were added in excessive amounts in the lower coating layer and the upper coating layer, the wear resistance was reduced by acting as a surface defect.

[0206] In addition, in the case of Examples 1 to 4, electrochemical bonding between cellulose and chitosan added to the lower coating layer and the upper coating layer, respectively, was formed, so that each coating layer was firmly bonded, and peeling between the lower coating layer and the upper coating layer did not occur, resulting in excellent wear resistance. In addition, it appears that the metal oxide added to the upper coating layer prevents peeling of the coating layer of the upper coating layer, resulting in excellent wear resistance. Furthermore, hydrogen bonding between the fluorine of the fluorine-based resin included in each coating layer and the cellulose or chitosan may be a cause of improving wear resistance.

[0207]

[0208] (5) Antibacterial properties: Among the examples and comparative examples, an antibacterial test was conducted to evaluate the antibacterial properties of chitosan and metal oxides included in the top coating layer, particularly for Example 1. The target strains were Staphylococcus aureus and Escherichia coli. Each strain was applied to the surface of the molded body on which the bottom coating layer and the top coating layer were formed, and the growth of the strains was confirmed. The results are shown in Table 3 below. In Table 3, the control group was tested for an antibacterial test using only a fluorine-based resin.

[0209] [Table 3]

[0210]

[0211] ※ In the above Table 3, the antibacterial activity value (log) = logC t - logS t (C t = Number of bacteria recovered from the control group after the reaction time, S t = Number of bacteria recovered from the test area after the reaction time).

[0212] ※ In Table 3 above, the antibacterial activity value ≥ 1.0: reduction by 90.0% or more, ≥ 2.0: reduction by 99.0% or more, ≥ 3.0: reduction by 99.9% or more, ≥ 4.0: reduction by 99.99% or more, ≥ 5.0: reduction by 99.999% or more.

[0213] Referring to the results in Table 3 above, in Example 1, both Staphylococcus aureus and Escherichia coli did not grow by more than 99.9% compared to the control group after 24 hours, and the antibacterial effect of chitosan and metal oxide included in the top coating layer was confirmed.

[0214]

[0215] The present invention has been described above, focusing on specific embodiments. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

1. A coating composition comprising 25 to 40 wt% of fluorinated resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of solvent; and A topcoat composition comprising 40 to 70 wt% of fluorinated resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of solvent; A fluorine coating agent, wherein the metal oxide comprises at least one of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O).

2. In the first paragraph, the fluorine-based resin is a fluorine coating agent comprising at least one of polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polyvinylidene fluoride (PVDF), and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).

3. In the first paragraph, the cellulose and chitosan are fluorine coating agents each having an average size of 0.01 to 1 μm.

4. In the first paragraph, the cellulose and chitosan are each spherical, ellipsoidal, fibrous, flake-shaped or irregularly shaped, a fluorine coating agent.

5. In the first paragraph, the fluorine coating composition further comprises at least one of 0.1 to 5 wt% of pigment and 1 to 10 wt% of carbon black based on the total weight.

6. In the first paragraph, the undercoat composition is a fluorine coating agent containing polyethersulfone and fluorine-based resin in a weight ratio of 1:0.8 to 1:

3.

7. In the first paragraph, the coating composition is a fluorine coating agent containing fluorophlogopite and glass flakes in a weight ratio of 1:1 to 1:

3.

8. A fluorine coating agent according to claim 1, wherein the undercoat composition comprises cellulose and zirconium oxide in a weight ratio of 1:2 to 1:

8.

9. A step of forming a bottom coating layer by applying and drying a bottom coating composition on at least one surface of a metal substrate; and A step of forming a top coating layer by applying and drying a top coating composition on one surface of the lower coating layer; The above-mentioned undercoat composition comprises 25 to 40 wt% of fluorinated resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of solvent. The above-mentioned coating composition comprises 40 to 70 wt% of fluorine resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of solvent. A method for manufacturing a molded body, wherein the metal oxide comprises at least one of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O).

10. Metal equipment; A lower coating layer formed on at least one surface of the metal substrate; and Including a top coating layer formed on one surface of the above-mentioned lower coating layer; The above-mentioned undercoat layer is formed from a undercoat composition containing 25 to 40 wt% of fluorine-based resin, 15 to 35 wt% of polyethersulfone, 1 to 10 wt% of titanium dioxide, 1 to 10 wt% of zirconium oxide, 0.1 to 5 wt% of cellulose, and 15 to 35 wt% of solvent. A molded body formed from a top coating composition, wherein the top coating layer comprises 40 to 70 wt% of a fluorine-based resin, 1 to 10 wt% of fluorphlogopite, 1 to 10 wt% of glass flakes, 0.001 to 5 wt% of a metal oxide, 0.1 to 5 wt% of chitosan, and 5 to 45 wt% of a solvent, wherein the metal oxide comprises at least one of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O).

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