Ceramic coating agent having excellent abrasion resistance and antibacterial properties

Abstract

The present invention relates to a ceramic coating agent having excellent abrasion resistance and antibacterial properties. In one embodiment, the ceramic coating agent comprises: a main agent including 10-40 wt % of alumina, 5-35 wt % of silica, 0.001-7 wt % of chitosan, 0.0001-3 wt % of a metal oxide, and 15-70 wt % of a solvent; and a curing agent including an alkoxysilane compound.

Description

Ceramic coating agent with excellent wear resistance and antibacterial properties

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

[0002]

[0003] Kitchenware such as frying pans and pots is primarily manufactured using materials such as steel, stainless steel, and aluminum; among these, aluminum is mainly used due to factors such as ease of forming and processing costs. While aluminum has the advantages of being relatively lightweight, having excellent thermal conductivity, and being easy to form, it has the disadvantage that repeated use can damage the bottom surface, leading to corrosion and food sticking. Additionally, if the bottom surface of a kitchenware is damaged and the user ingests the aluminum, it can cause various physical problems and be harmful to health.

[0004] In order to use aluminum reliably as kitchenware, it is desirable to use a coating agent on the inner surface of a frying pan or pot. However, if the coating layer formed by the coating agent is not durable and peels off, there is a problem in that food sticks to the aluminum substrate, causing it to corrode or become difficult to clean.

[0005] Meanwhile, fluorine-based and ceramic coatings are primarily used to protect the bottom surfaces of kitchenware. However, due to recent domestic and international regulations, the scope of use for fluorine-based coatings is shrinking, making the use of ceramic coatings essential. Nevertheless, since ceramic coatings generally focus on simple surface protection, there is a growing demand for various functionalities, such as preventing peeling caused by external impact.

[0006] The background technology related to the present invention is disclosed in Korean Registered Patent Publication No. 10-0895052 (published July 29, 2009; Title of Invention: Composition of Inorganic Ceramic Coating Agent).

[0007]

[0008] One objective of the present invention is to provide a ceramic coating agent having excellent wear resistance and antibacterial properties, as well as excellent durability and long life characteristics.

[0009] Another objective of the present invention is to provide a ceramic coating agent that has excellent interlayer adhesion and is effective in preventing delamination through the electrochemical bonding of constituent components.

[0010] Another objective of the present invention is to provide a ceramic coating agent with excellent appearance, chemical resistance, and antifouling properties.

[0011] Another objective of the present invention is to provide a ceramic coating agent with excellent miscibility, dispersibility, and formulation stability.

[0012] Another objective of the present invention is to provide a method for manufacturing a molded body using the ceramic coating agent.

[0013] Another objective of the present invention is to provide a molded body manufactured using the ceramic coating agent.

[0014]

[0015] One aspect of the present invention relates to a ceramic coating agent. In one embodiment, the ceramic coating agent comprises a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide, and 15 to 70 wt% solvent; and a curing agent comprising an alkoxysilane compound.

[0016] In one embodiment, the chitosan has an average size of 0.01 to 1 µm and a specific surface area (BET) of 2 to 100 m² 2 / g can be.

[0017] In one embodiment, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:1.5 to 6.

[0018] In one embodiment, the subject may further include 5 to 30 weight percent of pigment based on total weight.

[0019] In one embodiment, the metal oxide has an average size of 10 to 80 nm and may include one or more of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O).

[0020] In one embodiment, the alkoxysilane compound may include one or more of vinyltrimethoxysilane, phenyltrimethoxysilane, methyltrimethoxysilane, allyldialkylsilane, 3-glycidoxypropyltrimethoxysilane, 3-acryloxypropylmethyldiethoxysilane, 3-acryloxypropylmethyldimethoxysilane, 3-acryloxypropyltrimethoxysilane, 2-methacryloxyethyl-methyldimethoxysilane, 2-acryloxyethyltrimethoxysilane, 3-methylacryloxypropyl, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltriethoxysilane, 3-acryloxypropyldimethylethoxysilane, 2-methacryloxyethyltriethoxysilane, and 2-acryloxyethyltriethoxysilane.

[0021] Another aspect of the present invention relates to a method for manufacturing a molded body using the ceramic coating agent. In one embodiment, the method for manufacturing the molded body comprises the step of forming a ceramic coating layer by applying and drying a ceramic coating agent on at least one surface of a metal substrate; wherein the ceramic coating agent comprises a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide, and 15 to 70 wt% solvent, and a curing agent comprising an alkoxysilane compound.

[0022] Another aspect of the present invention relates to a molded article manufactured using the ceramic coating agent. In one embodiment, the molded article comprises a metal substrate; and a ceramic coating layer formed on at least one surface of the metal substrate; wherein the ceramic coating layer is formed from a ceramic coating agent comprising a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide and 15 to 70 wt% solvent, and a curing agent comprising an alkoxysilane compound.

[0023]

[0024] The ceramic coating agent according to the present invention has excellent wear resistance and antibacterial properties, excellent durability and long life characteristics, excellent interlayer adhesion, excellent effect of preventing peeling through electrochemical bonding of constituent components, excellent appearance, chemical resistance and antifouling properties, and excellent mixability, dispersibility, and formulation stability of the coating agent.

[0025]

[0026] In describing the present invention, if it is determined that a detailed description of related known technologies or configurations could unnecessarily obscure the essence of the invention, such detailed description will be omitted.

[0027] Furthermore, the terms described below are defined in consideration of their functions in the present invention; since these may vary depending on the intentions or practices of the user or operator, their definitions should be based on the content throughout this specification describing the present invention.

[0028]

[0029] Ceramic coating agent

[0030] One aspect of the present invention relates to a ceramic coating agent. In one embodiment, the ceramic coating agent comprises a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide, and 15 to 70 wt% solvent; and a curing agent comprising an alkoxysilane compound.

[0031] Below, the components of the ceramic coating agent described above will be explained in detail.

[0032]

[0033] subject

[0034] (1) Alumina: The above alumina may be included for the purpose of improving durability and wear resistance.

[0035] In one embodiment, the alumina may be spherical, ellipsoidal, acicular, polyhedral, or irregular. For example, it may be spherical.

[0036] In one embodiment, the alumina may have an average size of 20 to 100 nm. The size may refer to the maximum length or diameter of the alumina. Under the above conditions, the mixability and dispersibility may be excellent. For example, it may be 20 to 80 nm or 20 to 50 nm. For example, the alumina may have an average size of 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100 nm.

[0037] In one embodiment, the alumina is included in an amount of 10 to 40 weight percent based on the total weight of the main component. If the alumina is included in an amount of less than 10 weight percent, the durability or wear resistance of the coating layer is reduced, and if it is included in an amount exceeding 40 weight percent, the mixability and dispersibility of the coating agent are reduced and the antibacterial properties of the coating layer may be reduced. For example, the alumina may be included in an amount of 15 to 40 weight percent, 15 to 35 weight percent, 15 to 30 weight percent, 20 to 30 weight percent, or 20 to 25 weight percent. For example, the above alumina may be included in an amount of 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, or 40 weight percent based on the total weight of the subject.

[0038]

[0039] (2) Silica: The silica may be included to improve durability and wear resistance.

[0040] In one embodiment, the silica may be spherical, ellipsoidal, acicular, polyhedral, or irregular. For example, it may be spherical.

[0041] In one embodiment, the silica may be amorphous or crystalline. The silica may include one or more of fumed silica and precipitated silica.

[0042] In one embodiment, the silica has a specific surface area (BET method) of 40 to 500 m² 2 A value of / g may be used. The mechanical properties of the present invention may be excellent at the above specific surface area. For example, 150 to 350 m 2 You can use / g.

[0043] In one embodiment, the silica may have an average size of 20 to 100 nm. The size of the silica may refer to the maximum length or diameter of the silica. Within this range, dispersibility and mixability are excellent, and the durability and wear resistance of the coating layer may be excellent. For example, it may be 20 to 80 nm or 20 to 50 nm. For example, the silica may have an average size of 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100 nm.

[0044] In one embodiment, the silica is included in an amount of 5 to 35 weight percent based on the total weight of the main component. If the silica is included in an amount of less than 5 weight percent, the durability and wear resistance of the coating layer are reduced, and if it is included in an amount exceeding 35 weight percent, the mixability and dispersibility of the coating agent are reduced, and the durability and antibacterial properties of the coating layer may be reduced. For example, the silica may be included in an amount of 10 to 35 weight percent, 10 to 30 weight percent, 10 to 25 weight percent, 10 to 20 weight percent, or 10 to 15 weight percent. For example, the silica may be included in 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, or 35 weight percent based on the total weight of the subject matter.

[0045] In one embodiment, the subject may include the silica and alumina in a weight ratio of 1:0.5 to 3. When included within the weight ratio range, the mixing and dispersibility of the coating agent are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the subject may include the silica and alumina in a weight ratio of 1:1 to 3, 1:1.2 to 1:2.5, or 1:1.5 to 1:2.2.

[0046]

[0047] (3) Chitosan: The chitosan is included for the purpose of improving the interlayer adhesion, wear resistance, and antibacterial properties of the ceramic coating layer.

[0048] The present invention can prevent peeling of the ceramic coating layer and improve wear resistance by improving interfacial adhesion through electrochemical bonding between chitosan and a metal oxide.

[0049] Chitosan is derived from the natural polymer chitin and can be obtained through the deacetylation of chitin.

[0050] In one embodiment, the chitosan is prepared as a suspension with a concentration of 0.1 to 10 wt% and can be micronized through an underwater opposing collision device. By micronizing the chitosan, the specific surface area can be increased, thereby improving interfacial adhesion through electrochemical bonding with metal oxides.

[0051] In one embodiment, the chitosan may be fibrous or needle-shaped.

[0052] In one embodiment, 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 mixability and dispersibility may be excellent. For example, the chitosan may have an average size of 0.05 to 3 µm or 0.1 to 1 µm.

[0053] In one embodiment, the chitosan has a specific surface area (BET) of 2 to 100 m² 2 It may be / g. Under the above conditions, strong electrochemical bonds are formed between the metal oxides, improving interfacial adhesion to prevent peeling of the ceramic coating layer, and excellent antibacterial and wear resistance may be achieved. For example, the chitosan has a specific surface area (BET) of 5 to 80 m² 2 / g, 10~70 m 2 / g or 20~60 m 2 / g can be.

[0054] In one embodiment, the chitosan is included in an amount of 0.001 to 7 weight% based on the total weight of the subject. If the chitosan is included in an amount less than 0.001 weight%, the interlayer adhesion, wear resistance, and antibacterial properties of the ceramic coating layer are reduced, and if it is included in an amount exceeding 7 weight%, the mixability and dispersibility of the composition are reduced, and the durability of the coating layer may be reduced. For example, the chitosan may be included in an amount of 0.001 to 5 weight%, 0.001 to 3 weight%, 0.001 to 1 weight%, 0.001 to 0.5 weight%, or 0.01 to 0.5 weight%. For example, the chitosan 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, 5, 6, or 7 weight% based on the total weight of the subject.

[0055]

[0056] (4) Metal oxide: The metal oxide can further enhance the antibacterial properties of the ceramic coating layer through electrochemical bonding with the chitosan, and can improve interlayer adhesion, durability, and wear resistance.

[0057] In one embodiment, the metal oxide may be spherical, ellipsoidal, acicular, polyhedral, or irregular. For example, it may be spherical.

[0058] In one embodiment, the metal oxide may have an average size of 10 to 80 nm. The size of the metal oxide may refer to the maximum length or diameter of the metal oxide. Within this range, dispersibility and mixability are excellent, and the adhesion, durability, and wear resistance of the coating layer may be excellent. For example, the metal oxide may have an average size of 20 to 70 nm or 20 to 50 nm. For example, the metal oxide may have an average size of 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, or 80 nm.

[0059] In one embodiment, 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, the adhesion, durability, and wear resistance of the coating layer may be excellent.

[0060] In one embodiment, the metal oxide is included in an amount of 0.0001 to 3 weight% based on the total weight of the main component. If the metal oxide is included in an amount less than 0.0001 weight%, the adhesion of the coating layer is reduced and the durability and wear resistance are reduced; if it is included in an amount exceeding 3 weight%, the dispersibility and mixability of the coating agent are reduced and the durability and wear resistance of the coating layer may be reduced. For example, the metal oxide may be included in an amount of 0.0001 to 2 weight%, 0.0001 to 1 weight%, or 0.001 to 0.5 weight%. For example, the above metal oxide is 0.0001, 0.0002, 0.0003, 0.0004, 0.0005, 0.0006, 0.0007, 0.0008, 0.0009, 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, based on the total weight of the above subject. It may contain 1, 2, or 3 weight percent.

[0061]

[0062] (5) Solvent: The solvent is included for the purpose of ensuring the mixability and dispersibility of the coating agent. In one embodiment, the solvent may include one or more of water, alcohol-based solvents, aromatic hydrocarbon-based solvents, and ketone-based solvents.

[0063] For example, the above alcohol-based solvent may include one or more of ethanol, methanol, isopropyl alcohol, and butanol.

[0064] For example, the above aromatic hydrocarbon solvent may include one or more of benzene, toluene, and xylene.

[0065] For example, the above ketone-based solvent may include methylisobutyl ketone.

[0066] In one embodiment, the solvent is included in an amount of 15 to 70 weight percent based on the total weight of the main component. If the solvent is included in an amount less than 15 weight percent, the mixability and dispersibility of the coating agent are reduced, and if it is included in an amount exceeding 70 weight percent, the drying time of the coating layer is prolonged, which may reduce workability or cause defects in the coating layer, thereby degrading the surface quality. For example, the solvent may be included in an amount of 15 to 60 weight percent, 20 to 50 weight percent, 30 to 50 weight percent, or 35 to 45 weight percent. For example, the above 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, 35, 36, 37, 38, 39, 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 weight percent based on the total weight of the above subject.

[0067] In one embodiment, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:2 to 1:6. When included under these conditions, the mixability and dispersibility are excellent, and defects in the coating layer can be prevented. For example, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:2.5 to 1:5, 1:2.5 to 1:4, or 1:2.7 to 1:3.5.

[0068]

[0069] (6) Pigment: In one embodiment, the subject may further include 5 to 30 weight percent of pigment based on total weight.

[0070] The above pigment may include one or more of organic pigments and inorganic pigments. For example, the above organic pigment may include one or more 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.

[0071] For example, the above 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.

[0072] In one embodiment, the pigment may be included in an amount of 5 to 30 weight% based on the total weight of the main component. When included within this range, the mixability and dispersibility are excellent, and the appearance of the ceramic coating layer may be excellent. For example, the pigment may be included in an amount of 10 to 30 weight%, 10 to 25 weight%, 15 to 25 weight%, or 18 to 25 weight%. For example, the pigment 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, or 30 weight% based on the total weight of the main component.

[0073] In one embodiment, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:0.5 to 3:0.5 to 2. When included within the above weight ratio range, the mixability and dispersibility are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:1 to 3:1 to 2, 1:1.2 to 2.5:1.1 to 1.8, or 1:1.5 to 2.2:1.1 to 1.6.

[0074]

[0075] hardener

[0076] The above curing agent includes an alkoxysilane compound.

[0077] (1) Alkoxysilane compound: In one embodiment, the alkoxysilane compound is vinyltrimethoxysilane, phenyltrimethoxysilane, methyltrimethoxysilane, allyldialkylsilane, 3-glycidoxypropyltrimethoxysilane, 3-acryloxypropylmethyldiethoxysilane, 3-acryloxypropylmethyldimethoxysilane, 3-acryloxypropyltrimethoxysilane, 2-methacryloxyethyl-methyldimethoxysilane, 2-acryloxyethyltrimethoxysilane, 3-methylacryloxypropyl, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltriethoxysilane, 3-acryloxypropyldimethylethoxysilane, 2-methacryloxyethyltriethoxysilane and It may include one or more of 2-acryloxytyltriethoxysilanes. When the alkoxysilane compound is included, the coating agent component can be easily cured to form a ceramic coating layer, and the durability and adhesion of the coating layer may be excellent.

[0078] In one embodiment, the alkoxysilane compound may be included in an amount of 80 to 99.99 weight% based on the total weight of the curing agent. When included within this range, the mixability and dispersibility are excellent, and the coating agent can be easily cured. For example, the alkoxysilane compound may be included in an amount of 80 to 99.9 weight%, 85 to 99.9 weight%, 90 to 99.9 weight%, or 90 to 99 weight%.

[0079]

[0080] (2) Solvent: In one embodiment, the curing agent may further include a solvent.

[0081] In one embodiment, the solvent may include one or more of water, alcohol-based solvents, aromatic hydrocarbon-based solvents, and ketone-based solvents.

[0082] For example, the above alcohol-based solvent may include one or more of ethanol, methanol, isopropyl alcohol, and butanol.

[0083] For example, the above aromatic hydrocarbon solvent may include one or more of benzene, toluene, and xylene.

[0084] For example, the above ketone-based solvent may include methylisobutyl ketone.

[0085] In one embodiment, the solvent may be included in an amount of 0.01 to 20 weight% based on the total weight of the curing agent. Under these conditions, the mixability and dispersibility are excellent, workability is excellent, the coating layer can be easily dried and cured, and the surface quality can be excellent. For example, the solvent may be included in an amount of 0.1 to 20 weight%, 0.1 to 15 weight%, 0.1 to 10 weight%, or 1 to 10 weight%.

[0086] In one embodiment, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:0.5 to 1:4. When included under these conditions, the mixability and dispersibility are excellent, and defects in the coating layer can be prevented. For example, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:1 to 1:4, 1:1 to 1:3, 1:1 to 1:2, or 1:1.4 to 1:1.8.

[0087] In one embodiment, the subject may include the silica and alumina in a weight ratio of 1:0.5 to 3. When included within the weight ratio range, the mixing and dispersibility of the coating agent are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the subject may include the silica and alumina in a weight ratio of 1:1 to 3, 1:1.2 to 1:2.5, or 1:1.5 to 1:2.2.

[0088] In one embodiment, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:0.5 to 3:0.5 to 2. When included within the above weight ratio range, the mixability and dispersibility are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:1 to 3:1 to 2, 1:1.2 to 2.5:1.1 to 1.8, or 1:1.5 to 2.2:1.1 to 1.6.

[0089] In one embodiment, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:1.5 to 6. When included under the above weight ratio conditions, the mixability and dispersibility are excellent, the coating layer is easily formed, surface defects are prevented, and the antibacterial properties, durability, and wear resistance may be excellent. For example, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:2 to 1:5 or 1:2 to 1:4.

[0090]

[0091] Method for manufacturing a molded body using a ceramic coating agent

[0092] Another aspect of the present invention relates to a method for manufacturing a molded body using the ceramic coating agent. In one embodiment, the method for manufacturing the molded body comprises the step (S10) of applying and drying a ceramic coating agent on at least one surface of a metal substrate to form a ceramic coating layer; wherein the ceramic coating agent comprises a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide, and 15 to 70 wt% solvent, and a curing agent comprising an alkoxysilane compound.

[0093] The main component and curing agent of the ceramic coating agent mentioned above may be the same as those described above.

[0094] In one embodiment, the subject may further include 5 to 30 weight percent of pigment based on total weight.

[0095] The above pigment may include one or more of organic pigments and inorganic pigments. For example, the above organic pigment may include one or more 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.

[0096] For example, the above 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.

[0097] In one embodiment, the pigment may be included in an amount of 5 to 30 weight% based on the total weight of the main component. When included within this range, the mixability and dispersibility are excellent, and the appearance of the ceramic coating layer may be excellent. For example, the pigment may be included in an amount of 10 to 30 weight%, 10 to 25 weight%, 15 to 25 weight%, or 18 to 25 weight%.

[0098] In one embodiment, the curing agent may further include a solvent.

[0099] In one embodiment, the solvent may include one or more of water, alcohol-based solvents, aromatic hydrocarbon-based solvents, and ketone-based solvents.

[0100] For example, the above alcohol-based solvent may include one or more of ethanol, methanol, isopropyl alcohol, and butanol.

[0101] For example, the above aromatic hydrocarbon solvent may include one or more of benzene, toluene, and xylene.

[0102] For example, the above ketone-based solvent may include methylisobutyl ketone.

[0103] In one embodiment, the solvent may be included in an amount of 0.01 to 20 weight% based on the total weight of the curing agent. Under these conditions, the mixability and dispersibility are excellent, workability is excellent, the coating layer can be easily dried and cured, and the surface quality can be excellent. For example, the solvent may be included in an amount of 0.1 to 20 weight%, 0.1 to 15 weight%, 0.1 to 10 weight%, or 1 to 10 weight%.

[0104] In one embodiment, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:0.5 to 1:4. When included under these conditions, the mixability and dispersibility are excellent, and defects in the coating layer can be prevented. For example, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:1 to 1:4, 1:1 to 1:3, or 1:1 to 1:2.

[0105] In one embodiment, the subject may include the silica and alumina in a weight ratio of 1:0.5 to 3. When included within the weight ratio range, the mixing and dispersibility of the coating agent are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the subject may include the silica and alumina in a weight ratio of 1:1 to 3, 1:1.2 to 1:2.5, or 1:1.5 to 1:2.2.

[0106] In one embodiment, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:0.5 to 4:0.5 to 4. When included within the above weight ratio range, the mixability and dispersibility are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:1 to 3:1 to 2, 1:1.2 to 2.5:1.1 to 1.8, or 1:1.5 to 2.2:1.1 to 1.6.

[0107] In one embodiment, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:1.5 to 6. When included under the above weight ratio conditions, the mixability and dispersibility are excellent, the coating layer is easily formed, surface defects are prevented, and the antibacterial properties, durability, and wear resistance may be excellent. For example, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:2 to 1:5 or 1:2 to 1:4.

[0108] In the above step (S10), the metal substrate may include one or more of aluminum (Al), copper (Cu), magnesium (Mg), iron (Fe), and stainless steel. For example, the metal substrate may form a portion that comes into direct contact with a heat source by using cold rolling or the like to form irregularities on the surface of the portion that comes into contact with the heat source.

[0109] In one embodiment, before applying the ceramic coating agent, the surface of the metal substrate to which the coating agent is applied may be pretreated by grinding it with sandpaper. For example, the surface of the metal substrate may be pretreated by grinding it using sandpaper. During the pretreatment, the adhesion between the ceramic coating layer and the metal substrate may be excellent.

[0110] In one embodiment, the ceramic coating agent may be sprayed using a nozzle. The nozzle has a diameter of 1.0 to 1.5 mm, and the spray pressure is 3 to 10 kgf / cm². 2 It can be applied under these conditions. Under the above conditions, workability and durability of the coating layer may be excellent. For example, the spray pressure is 3~5 kgf / cm² 2 It can be applied under certain conditions. For example, the spray pressure is 3, 4, 5, 6, 7, 8, 9, or 10 kgf / cm². 2 It can be applied under certain conditions.

[0111] In one embodiment, the above (S10) may be carried out by including the step of applying the ceramic coating agent to at least one surface of the metal substrate and raising and maintaining the temperature to 80 to 100°C for a first drying step; and the step of raising and maintaining the temperature of the metal substrate coated with the ceramic coating agent to 160 to 200°C for a second drying step.

[0112] Under the above conditions, rapid evaporation of moisture and solvent components during the first drying can be prevented, thereby preventing defects in the coating layer. For example, the first drying can be carried out by raising the temperature to 80 to 100°C and maintaining it for 1 to 20 minutes or 5 to 15 minutes.

[0113] For example, the above first drying can be carried out by raising the temperature to 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, or 100℃ and maintaining it.

[0114] Under the above conditions, moisture and solvent components can be completely removed during the second drying, thereby preventing defects in the coating layer and ensuring excellent durability and adhesion. For example, the second drying can be performed by raising the temperature of a metal substrate coated with a ceramic coating agent to 160 to 200°C and maintaining it for 10 to 60 minutes or 15 to 25 minutes.

[0115] For example, the above secondary drying can be carried out by raising and maintaining the temperature to 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, or 200℃.

[0116] In one embodiment, the ceramic coating layer may have a thickness of 1 to 50 μm. Under the thickness conditions, the adhesion, appearance, wear resistance, heat resistance, and durability of the ceramic coating layer may be excellent. For example, it may be 10 to 40 μm, 15 to 35 μm, or 20 to 35 μm.

[0117]

[0118] A molded body manufactured using a ceramic coating agent

[0119] Another aspect of the present invention relates to a molded article manufactured using the ceramic coating agent. In one embodiment, the molded article comprises a metal substrate; and a ceramic coating layer formed on at least one surface of the metal substrate; wherein the ceramic coating layer is formed from a ceramic coating agent comprising a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide and 15 to 70 wt% solvent, and a curing agent comprising an alkoxysilane compound.

[0120] The main component and curing agent of the ceramic coating agent mentioned above may be the same as those described above.

[0121] In one embodiment, the subject may further include 5 to 30 weight percent of pigment based on total weight.

[0122] The above pigment may include one or more of organic pigments and inorganic pigments. For example, the above organic pigment may include one or more 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.

[0123] For example, the above 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.

[0124] In one embodiment, the pigment may be included in an amount of 5 to 30 weight% based on the total weight of the main component. When included within this range, the mixability and dispersibility are excellent, and the appearance of the ceramic coating layer may be excellent. For example, the pigment may be included in an amount of 10 to 30 weight%, 10 to 25 weight%, 15 to 25 weight%, or 18 to 25 weight%.

[0125] In one embodiment, the curing agent may further include a solvent.

[0126] In one embodiment, the solvent may include one or more of water, alcohol-based solvents, aromatic hydrocarbon-based solvents, and ketone-based solvents.

[0127] For example, the above alcohol-based solvent may include one or more of ethanol, methanol, isopropyl alcohol, and butanol.

[0128] For example, the above aromatic hydrocarbon solvent may include one or more of benzene, toluene, and xylene.

[0129] For example, the above ketone-based solvent may include methylisobutyl ketone.

[0130] In one embodiment, the solvent may be included in an amount of 0.01 to 20 weight% based on the total weight of the curing agent. Under these conditions, the mixability and dispersibility are excellent, workability is excellent, the coating layer can be easily dried and cured, and the surface quality can be excellent. For example, the solvent may be included in an amount of 0.1 to 20 weight%, 0.1 to 15 weight%, 0.1 to 10 weight%, or 1 to 10 weight%.

[0131] In one embodiment, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:0.5 to 1:4. When included under these conditions, the mixability and dispersibility are excellent, and defects in the coating layer can be prevented. For example, the solvent may comprise an alcohol-based solvent and water in a weight ratio of 1:1 to 1:4, 1:1 to 1:3, or 1:1 to 1:2.

[0132] In one embodiment, the subject may include the silica and alumina in a weight ratio of 1:0.5 to 3. When included within the weight ratio range, the mixing and dispersibility of the coating agent are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the subject may include the silica and alumina in a weight ratio of 1:1 to 3, 1:1.2 to 1:2.5, or 1:1.5 to 1:2.2.

[0133] In one embodiment, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:0.5 to 4:0.5 to 4. When included within the above weight ratio range, the mixability and dispersibility are excellent, and the durability and wear resistance may be excellent while preventing defects in the coating layer. For example, the above subject may include the silica, alumina, and pigment in a weight ratio of 1:1 to 3:1 to 2, 1:1.2 to 2.5:1.1 to 1.8, or 1:1.5 to 2.2:1.1 to 1.6.

[0134] In one embodiment, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:1.5 to 6. When included under the above weight ratio conditions, the mixability and dispersibility are excellent, the coating layer is easily formed, surface defects are prevented, and the antibacterial properties, durability, and wear resistance may be excellent. For example, the ceramic coating agent may contain the curing agent and the main component in a weight ratio of 1:2 to 1:5 or 1:2 to 1:4.

[0135]

[0136] Hereinafter, the structure and operation of the present invention will be explained in more detail through preferred embodiments. However, these are presented as preferred examples of the present invention and should not be interpreted in any way as limiting the present invention. Details not described herein can be sufficiently technically inferred by those skilled in the art, so such descriptions will be omitted.

[0137]

[0138] Examples and Comparative Examples

[0139] The components used in the examples and comparative examples are as follows.

[0140] subject

[0141] (A) Alumina: Spherical alumina with an average particle size of 20–50 nm was used.

[0142] (B) Silica: Spherical silica with an average particle size of 20–50 nm was used.

[0143] (C) Chitosan: Average size 0.01–1 µm and specific surface area (BET) 2–100 m² 2 A suspension containing chitosan nanofibers in g / g was prepared.

[0144] (D) Metal oxide: Silver oxide (Ag2O) with an average particle size of 30 nm was used.

[0145] (E) Pigment: CI pigment brown 24 was used.

[0146] (F) Solvent: (F1) Ethanol was used. (F2) Water was used.

[0147]

[0148] hardener

[0149] (A) Alkoxysilane compound: Methyltrimethoxysilane was used.

[0150] (B) Solvent: (B1) Ethanol was used. (B2) Water was used.

[0151]

[0152] Examples 1–4 and Comparative Examples 1–8

[0153] Ceramic coating agents were prepared by each containing the main component and the hardener in a 3:1 weight ratio according to the conditions in Tables 1 and 2 below. Then, the ceramic coating agent was applied to one surface of a metal substrate (stainless steel) at a rate of 3–5 kgf / cm² using a nozzle (diameter 1.0–1.5 mm). 2It was applied with a spray pressure. Then, the coating agent applied to the metal substrate was heated to 80 to 100°C and maintained for 10 minutes for first drying, and heated to 160 to 200°C and maintained for 20 minutes for second drying to form a ceramic coating layer with a thickness of about 30 μm.

[0154] [Table 1]

[0155]

[0156] [Table 2]

[0157]

[0158] Experimental Example

[0159] (1) Mixability: The mixability and dispersibility of the ceramic coating agents of the examples and comparative examples were evaluated, and the results are shown in Tables 3 and 4 below (◎: excellent dispersibility, ○: very small parts are undispersed or aggregation occurs, △: some components are undispersed or aggregation occurs, X: severe undispersion occurs due to aggregation and phase separation).

[0160] (2) Appearance: The appearance of the ceramic coating layers of the examples and comparative examples was visually inspected to evaluate whether discoloration and cracking occurred, and the results are shown in Tables 3 and 4 below (◎: No cracks / discoloration, ○: Cracks or discoloration occurred in a very small part, △: Cracks or discoloration occurred in some part, X: Severe cracks or discoloration occurred).

[0161] (3) Adhesion: For the above examples and comparative examples, the adhesion between the metal substrate and the ceramic coating layer was evaluated by a cross-cut tape peel test according to JIS K 5400, and the results are shown in Tables 3 and 4 below. The number of cross-cuts that were not peeled off was shown for the total number of cross-cuts (100) formed with a size of 1.5 mm x 1.5 mm.

[0162] (4) Wear resistance: The wear resistance of the above examples and comparative examples was measured using a wear resistance tester, and the results are shown in Tables 3 and 4 below. The wear resistance test can be analyzed by the number of times a steel scouring pad reciprocated with a load of 1 kg. The above wear resistance evaluation included all exposure of the substrate due to peeling of the ceramic coating layer caused by repeated external forces.

[0163] [Table 3]

[0164]

[0165] [Table 4]

[0166]

[0167] Referring to the results of Tables 3 and 4 above, it was found that Examples 1 to 4 had excellent mixability and dispersibility of the coating agent compared to Comparative Examples 1 to 8, excellent appearance of the ceramic coating layer, and excellent adhesion and wear resistance between the coating layer and the metal substrate.

[0168] In addition, in Comparative Example 4, in which chitosan was not applied, Comparative Example 6, in which metal oxide was not applied, and Comparative Example 8, in which neither chitosan nor metal oxide was applied, the wear resistance was reduced compared to Examples 1 to 4. Through this, it was found that chitosan and metal oxide must be applied in combination to increase surface hardness due to electrochemical bonding and thereby improve wear resistance.

[0169]

[0170] (5) Antibacterial properties: Among the examples and comparative examples, specifically Example 1, an antibacterial test was conducted to evaluate the antibacterial properties of the chitosan and metal oxide included in the ceramic coating layer. The test was performed on Staphylococcus aureus as the target strain. Each strain was applied to the surface of a molded body with a ceramic coating layer to check for growth, and the results are shown in Table 5 below. In Table 5 above, the control group was tested using Comparative Example 8.

[0171] [Table 5]

[0172]

[0173] ※ In Table 5 above, the antimicrobial activity value (log) = logC t - logS t (C t = Number of bacteria recovered from the control group after reaction time, S t = Number of bacteria recovered from the test group after reaction time).

[0174] ※ In Table 5 above, the antibacterial activity values ​​≥1.0: 90.0% or more reduction, ≥2.0: 99.0% or more reduction, ≥3.0: 99.9% or more reduction, ≥4.0: 99.99% or more reduction, ≥5.0: 99.999% or more reduction.

[0175]

[0176] Referring to the results in Table 5 above, in Example 1, more than 99.9% of the bacteria did not grow compared to the control group after 24 hours against Staphylococcus aureus, and the antibacterial effect of chitosan and metal oxide compared to Comparative Example 8 was confirmed.

[0177]

[0178] The present invention has been described above with reference to embodiments. Those skilled in the art will understand that the present invention may be embodied in modified forms without departing from the essential characteristics of the invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the invention is defined by the claims, not by the foregoing description, and all variations within the scope of equivalents should be interpreted as being included in the invention.

Claims

1. A subject comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide and 15 to 70 wt% solvent; and A ceramic coating agent comprising a curing agent comprising an alkoxysilane compound.

2. In claim 1, the chitosan has an average size of 0.01 to 1 µm and a specific surface area (BET) of 2 to 100 m² 2 / g ceramic coating agent.

3. The ceramic coating agent according to claim 1, wherein the ceramic coating agent comprises the curing agent and the main component in a weight ratio of 1:1.5 to 6.

4. The ceramic coating agent according to claim 1, wherein the subject further comprises 5 to 30 weight percent of pigment based on total weight.

5. In claim 1, the metal oxide has an average size of 10 to 80 nm, and A ceramic coating agent comprising one or more of copper oxide (CuO), zinc oxide (ZnO), calcium oxide (CaO), magnesium oxide (MgO), and silver oxide (Ag2O).

6. The ceramic according to claim 1, wherein the alkoxysilane compound comprises one or more of vinyltrimethoxysilane, phenyltrimethoxysilane, methyltrimethoxysilane, allyldialkylsilane, 3-glycidoxypropyltrimethoxysilane, 3-acryloxypropylmethyldiethoxysilane, 3-acryloxypropylmethyldimethoxysilane, 3-acryloxypropyltrimethoxysilane, 2-methacryloxyethyl-methyldimethoxysilane, 2-acryloxyethyltrimethoxysilane, 3-methylacryloxypropyl, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltriethoxysilane, 3-acryloxypropyldimethylethoxysilane, 2-methacryloxyethyltriethoxysilane, and 2-acryloxyethyltriethoxysilane. Coating agent.

7. A step of forming a ceramic coating layer by applying and drying a ceramic coating agent on at least one surface of a metal substrate; comprising, A method for manufacturing a molded body, comprising a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide, and 15 to 70 wt% solvent, and a curing agent comprising an alkoxysilane compound.

8. Metal substrate; and A ceramic coating layer formed on at least one surface of the metal substrate; comprising The above ceramic coating layer is a molded body formed from a ceramic coating agent comprising a main component comprising 10 to 40 wt% alumina, 5 to 35 wt% silica, 0.001 to 7 wt% chitosan, 0.0001 to 3 wt% metal oxide, and 15 to 70 wt% solvent, and a curing agent comprising an alkoxysilane compound.

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