Coating composition for stainless steel with nano-link pairing structure containing sapphire component and realizing high durability and high release properties

Abstract

The present invention relates to a coating composition for stainless steel having a nanolink pairing structure that achieves high durability and high release properties, containing sapphire components. More specifically, it comprises porous ceramic particles supported with a release agent, 3-glycidoxypropyltrimethoxysilane, hydrochloric acid, distilled water, and sapphire nanopowder. The coating composition comprising the above components contains sapphire nanopowder, which improves the heat resistance and wear resistance of the coating layer formed on the stainless steel surface, thereby extending the service life and forming a coating layer with low surface roughness, thus providing stainless steel that can be applied to kitchenware with excellent release properties.

Description

Technology Field

[0001] The present invention relates to a coating composition for stainless steel having a nanolink pairing structure that achieves high durability and high release properties by containing sapphire components. More specifically, the invention relates to a coating composition for stainless steel having a nanolink pairing structure that achieves high durability and high release properties by containing sapphire nanopowder, which not only extends the service life by improving the heat resistance and wear resistance of the coating layer formed on the stainless steel surface, but also provides stainless steel that can be applied as kitchenware exhibiting excellent release properties by forming a coating layer with low surface roughness. Background Technology

[0002] Generally, kitchenware refers to frying pans, woks, pots, or hot pots used for grilling or cooking food, and lids that are attached thereto. These kitchenware are provided with a coating layer on the surface of a stainless steel base to prevent corrosion and to prevent food from sticking.

[0003] Meanwhile, release agents are used to facilitate the release and detachment of specific substances from a surface; however, surface coating agents with permanently release properties may experience separation and / or wear of the release-prone surface coating layer from the substrate due to repeated use, or their lifespan may be reduced due to continuous heating and / or cooling cycles.

[0004] Another type of release agent is silicone, which can be utilized in the form of: 2) the application of a thin silicone sheet (including optionally enclosed reinforcing structures) placed flat on a cooking surface; 3) a thin coating of silicone sprayed (typically resins) and / or coated on trays or pans (Bundy Pans); and 4) trays or pans molded from silicone (typically elastomeric silicone).

[0005] Although a thicker silicone coating may be used to increase the lifespan of the silicone coating, the silicone limits heat transfer from the heat source to the heat source on the surface, and thus may cause problems in heating the food to an appropriate temperature or increasing the time required to heat the food.

[0006] Surfaces coated with a thin thickness using methods such as spray coating have a short service life due to the tendency of the silicone to separate from the substrate and / or wear away.

[0007] Generally, to facilitate heat transfer, the silicon coating is designed to maintain close surface-to-surface contact between the substrate and the silicon; however, due to the different coefficients of thermal expansion of the silicon and the substrate containing the silicon coating, the silicon is eventually released from the substrate surface after several baking cycles.

[0008] Meanwhile, as concerns regarding the harmfulness of fluoropolymer coatings to the human body are constantly being raised, there is a need to develop a coating composition with improved service life and superior release properties and thermal conductivity as a silicone coating technology capable of resolving these issues. Prior art literature

[0009] Korean Patent Registration No. 10-1074482 (Oct. 11, 2011) Korean Patent Registration No. 10-1244743 (March 12, 2013) The problem to be solved

[0010] The objective of the present invention is to provide a coating composition for stainless steel containing sapphire components that achieves high durability and high release properties, having a nano-link pairing structure, which provides stainless steel applicable to kitchenware that not only extends the service life by improving the heat resistance and wear resistance of the coating layer formed on the stainless steel surface by containing sapphire nanopowder, but also achieves excellent release properties by forming a coating layer with low surface roughness. means of solving the problem

[0011] The objective of the present invention can be achieved by providing a coating composition for stainless steel containing a sapphire component that provides high durability and release properties, characterized by comprising 100 parts by weight of porous ceramic particles supported with a release agent, 100 to 120 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.5 to 1 part by weight of hydrochloric acid, 10 to 25 parts by weight of distilled water, and 0.5 to 1 part by weight of sapphire nanopowder, wherein the porous ceramic particles are composed of zeolite with a pore diameter of 10 to 1000 nanometers and copper coated inside the pores, and the release agent comprises 100 parts by weight of hydroxysilicone oil, 40 to 60 parts by weight of 3-glycidoxypropyltrimethoxysilane, 5 to 20 parts by weight of octamethylcyclotetrasiloxane, and 0.5 to 5 parts by weight of castor oil.

[0012] According to a preferred feature of the present invention, the coating composition for stainless steel that achieves high durability and mold release properties further contains 0.5 to 5 parts by weight of a vanadium component per 100 parts by weight of the porous ceramic particles, and the vanadium component is composed of one or more selected from the group consisting of vanadyl acetylacetonate, vanadium pentoxide, metavanadic acid, ammonium metavanadate, sodium metavanadate, vanadium oxytrichloride, vanadium trioxide, vanadium dioxide, vanadium oxysulfate, vanadium oxyacetylacetate, vanadium acetylacetate, and vanadium trichloride.

[0014] In addition, the objective of the present invention is to provide a method for coating stainless steel, comprising: a stainless steel pretreatment step for passivating the surface of the stainless steel; a primer coating step for coating the surface of the stainless steel that has been passivated through the stainless steel pretreatment step with a coating composition exhibiting high durability and release properties according to any one of claims 1 to 2; and a top coating step for coating the surface of the stainless steel coated with the coating composition coated through the primer coating step with a top coating composition, wherein the top coating composition comprises 100 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.25 to 1 part by weight of hydrochloric acid, 20 to 50 parts by weight of distilled water, 75 to 125 parts by weight of colloidal silica, 15 to 25 parts by weight of a dispersant, and 1 to 3 parts by weight of polysiloxane imide, wherein the dispersant is formed by mixing 20 to 30 parts by weight of ethyl acetate with 100 parts by weight of distilled water. It can be achieved. Effects of the invention

[0015] The coating composition for stainless steel having a nanolink pairing structure that implements high durability and release properties according to the present invention contains sapphire nanopowder, which improves the heat resistance and wear resistance of the coating layer formed on the stainless steel surface. This not only extends the service life but also forms a coating layer with low surface roughness, thereby providing stainless steel that can be used as kitchenware with excellent release properties, exhibiting an excellent effect. Brief explanation of the drawing

[0016] FIG. 1 is a flowchart illustrating a method for coating stainless steel according to the present invention. Specific details for implementing the invention

[0017] Hereinafter, preferred embodiments of the present invention and the physical properties of each component are described in detail. This description is intended to be sufficient for a person skilled in the art to easily practice the invention, and does not imply that the technical scope and concept of the present invention are limited thereby.

[0019] The coating composition for stainless steel having a nanolink pairing structure that implements high durability and release properties according to the present invention comprises porous ceramic particles supported with a release agent, 3-glycidoxypropyltrimethoxysilane (GPTMS), hydrochloric acid, distilled water, and sapphire nanopowder, and preferably comprises 100 parts by weight of porous ceramic particles supported with a release agent, 100 to 120 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.5 to 1 part by weight of hydrochloric acid, 10 to 25 parts by weight of distilled water, and 0.5 to 1 part by weight of sapphire nanopowder.

[0020] The porous ceramic particles supported with the above-mentioned release agent have a pore diameter of 10 to 1000 nanometers and are composed of zeolite coated with copper inside the pores, and it is preferable that the pores formed in the porous ceramic particles be coated with copper.

[0021] As described above, when a porous layer formed on porous ceramic particles is coated with copper, the release agent component is not easily lost from the porous layer to the outside due to the interaction between the release agent component and copper ions, but is gradually released, thereby providing a coating layer that can maintain release properties for a long period of time.

[0022] At this time, the method of coating copper on the pore layer formed on the porous ceramic particles is carried out by immersing the porous ceramic particles in an aqueous solution in which copper ions are dispersed, mixing thoroughly, adding a reducing agent in an amount greater than an equivalent to reduce the metal, and then washing the outer surface of the porous ceramic particles 5 to 8 times so that most of the coating layer formed on the surface of the porous ceramic particles is removed by washing, and a copper coating layer is formed inside the pore layer formed on the porous ceramic particles.

[0023] At this time, the release agent comprises 100 parts by weight of hydroxy silicone oil, 40 to 60 parts by weight of 3-glycidoxypropyltrimethoxysilane, 5 to 20 parts by weight of octamethylcyclotetrasiloxane, and 0.5 to 5 parts by weight of castor oil. The release agent composed of the above components contains a binder component such as 3-glycidoxypropyltrimethoxysilane, so that silicone oil is not easily released or lost within the pores formed in the porous ceramic, thereby serving to continuously supply silicone oil components to the top coating layer formed on the upper surface of the undercoat layer for a long period of time.

[0024] The above hydroxy silicone oil generally volatilizes at a temperature of around 250°C. However, when 3-glycidoxypropyltrimethoxysilane and octamethylcyclotetrasiloxane are included as described above, the silicone oil is not lost not only at temperatures above 250°C but also at temperatures around 330°C, and the silicone oil can be continuously supplied from the undercoat layer to the topcoat layer, thereby exhibiting the effect of maintaining release properties on the surface of stainless steel for a long period.

[0025] If the content of the above 3-glycidoxypropyltrimethoxysilane is less than 40 parts by weight, the above effect is negligible, and if the content of the above 3-glycidoxypropyltrimethoxysilane exceeds 60 parts by weight, the above effect is not significantly improved, and the content of the hydroxy silicone oil is reduced excessively, which may lower the release effect, so it is undesirable.

[0026] In addition, the above castor oil is contained in an amount of 0.5 to 5 parts by weight and serves to ensure that each component constituting the release agent is uniformly mixed. If the content of the above castor oil is less than 0.5 parts by weight, the above effect is negligible, and if the content of the above castor oil exceeds 5 parts by weight, the above effect is not significantly improved, and the remaining castor oil component is excessively loaded within the pores of the porous particles, which is undesirable.

[0027] In addition, the above 3-glycidoxypropyltrimethoxysilane is contained in an amount of 100 to 120 parts by weight and acts as a binder that binds porous ceramic particles supported with a release agent and sapphire nanopowder, which constitute the stainless steel coating composition that achieves high durability and release properties manufactured through the present invention. If the content of the above 3-glycidoxypropyltrimethoxysilane is less than 100 parts by weight, the above effect is negligible and the surface hardness of the coating film formed by the coating composition is reduced, and if the content of the above 3-glycidoxypropyltrimethoxysilane exceeds 120 parts by weight, the adhesion between the coating layer and the top coating layer formed on top of the coating layer is reduced, which is undesirable because interlayer separation may occur.

[0028] In addition, the hydrochloric acid is contained in an amount of 0.5 to 1 weight part and serves to improve the degree of polymerization of the 3-glycidoxypropyltrimethoxysilane. If the content of the hydrochloric acid is less than 0.5 weight parts, the degree of polymerization of the 3-glycidoxypropyltrimethoxysilane is low, so the reaction is not sufficiently carried out, which may degrade the physical properties of the coating layer. If the content of the hydrochloric acid exceeds 1 weight part, the reaction rate increases excessively, making it difficult to achieve a homogeneous reaction, and thus the coating layer cannot be formed uniformly.

[0029] In addition, the above sapphire nanopowder is preferably used in an amount of 0.5 to 1 weight part and has a particle size of 1 to 50 nanometers. It has excellent heat resistance and wear resistance, which not only improves the mechanical strength of the coating layer but also lowers the surface roughness of the coating layer, thereby maintaining release properties and providing a kitchen container that does not allow food to stick easily.

[0030] If the content of the above sapphire nanopowder is less than 0.5 parts by weight, the above effect is negligible, and if the content of the above sapphire nanopowder exceeds 1 part by weight, the above effect is not significantly improved, and the mechanical properties of the coating layer are actually degraded and the manufacturing cost is excessively increased, so it is undesirable.

[0031] In addition, the coating composition for stainless steel that achieves high durability and release properties may further contain 0.5 to 5 parts by weight of a vanadium component per 100 parts by weight of the porous ceramic particles. When the vanadium component is further included as described above, not only is the corrosion resistance of the coating layer improved, but a stable metal chelate compound is formed by inducing a chelation reaction, thereby improving the bonding strength between the metal atoms of the stainless steel and the coating layer, resulting in the formation of a coating layer with excellent adhesion.

[0032] At this time, the vanadium component is preferably composed of one or more selected from the group consisting of vanadyl acetylacetonate, vanadium pentoxide, metavanadic acid, ammonium metavanadate, sodium metavanadate, vanadium oxytrichloride, vanadium trioxide, vanadium dioxide, vanadium oxysulfate, vanadium oxyacetylacetate, vanadium acetylacetate, and vanadium trichloride.

[0033] If the content of the vanadium component is less than 0.5 parts by weight, it is difficult to form a metal chelate compound, so the above effect is negligible, and if the content of the vanadium component exceeds 5 parts by weight, the above effect is not significantly improved, and unreacted metal compounds remain, which may degrade the mechanical properties of the undercoat layer, so it is undesirable.

[0035] In addition, the stainless steel coating method according to the present invention comprises a stainless steel pretreatment step (S101) for passivating the surface of the stainless steel, a primer coating step (S103) for coating a primer coating composition that provides high durability and release properties onto the surface of the stainless steel that has been passivated through the stainless steel pretreatment step (S101), and a top coating step (S105) for coating a top coating composition onto the surface of the stainless steel coated with the primer coating composition coated through the primer coating step (S103).

[0036] The above stainless steel pretreatment step (S101) is a step that allows stainless steel with improved corrosion resistance to be provided by passivating the surface of the stainless steel, and it is preferable that the passivation treatment be performed by impregnating the stainless steel with citric acid or nitric acid in accordance with business standards such as ASTM A 967 and AMS 2700.

[0037] The above undercoat coating step (S103) is a step of coating the surface of the stainless steel that has been passivated through the above stainless steel pretreatment step (S101) with a coating composition that provides high durability and release properties to a thickness of 1 to 20 micrometers. At this time, the coating composition that provides high durability and release properties consists of 100 parts by weight of porous ceramic particles supported with a release agent, 100 to 120 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.5 to 1 part by weight of hydrochloric acid, 10 to 25 parts by weight of distilled water, and 0.5 to 1 part by weight of sapphire nanopowder. Since the components, roles, and critical significance of each component constituting the coating composition made of the above ingredients are identical to those described in the above coating composition for stainless steel that provides high durability and release properties, a description thereof will be omitted.

[0038] In the above undercoat coating step (S103), if the coating thickness of the undercoat composition that achieves high durability and release properties is less than 1 micrometer, the effect of improving the durability and release properties of stainless steel is negligible, and if the coating thickness of the undercoat composition that achieves high durability and release properties exceeds 20 micrometers, the above effect is not significantly improved, and it is undesirable because it excessively increases the manufacturing cost of the kitchenware.

[0039] The above topcoat coating step (S105) is a step of coating a topcoat coating composition on the surface of stainless steel coated with a primer coating composition coated through the above primer coating step (S103), and it is preferable that the topcoat coating composition is coated to a thickness of 1 to 10 μm on the surface of stainless steel coated with a primer coating composition through the above primer coating step (S103).

[0040] At this time, the topcoat composition comprises 100 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.25 to 1 part by weight of hydrochloric acid, 20 to 50 parts by weight of distilled water, 75 to 125 parts by weight of colloidal silica, 15 to 25 parts by weight of a dispersant, and 1 to 3 parts by weight of polysiloxane imide, and the dispersant is preferably formed by mixing 20 to 30 parts by weight of ethyl acetate with 100 parts by weight of distilled water.

[0041] In the above topcoat composition, hydrochloric acid is contained in an amount of 0.25 to 1 weight part. Unlike the undercoat layer, the topcoat layer is a layer that is exposed to the outer surface, and by controlling the curing speed of the coating layer so that it can be formed into a uniform and smooth surface, it plays a role in forming a uniform layer with high surface hardness on the surface.

[0042] If the content of the hydrochloric acid is less than 0.25 parts by weight, the degree of polymerization increases excessively, which lowers the degree of polymerization of the 3-glycidoxypropyltrimethoxysilane and degrades the mechanical properties of the top coating layer; if the content of the hydrochloric acid exceeds 1 part by weight, it is difficult to form the coating layer with sufficient strength and uniform thickness, and the time required to form the coating layer is excessive, which reduces workability and is therefore undesirable.

[0043] In addition, the above colloidal silica is contained in an amount of 75 to 125 parts by weight. If the content of the colloidal silica is less than 75 parts by weight, the heat resistance and mammability of the topcoat layer are reduced, and if the content of the colloidal silica exceeds 125 parts by weight, the topcoat layer is not formed uniformly, which is undesirable.

[0044] In addition, the above-mentioned dispersant is contained in an amount of 15 to 25 parts by weight and is formed by mixing 20 to 30 parts by weight of ethyl acetate with 100 parts by weight of distilled water, and plays a role in ensuring that each component constituting the topcoat layer is evenly dispersed so that a topcoat layer with uniform physical properties can be provided.

[0045] If the content of the above-mentioned dispersant is less than 15 parts by weight, the above effect is negligible, and if the content of the above-mentioned dispersant exceeds 25 parts by weight, the viscosity of the topcoat layer becomes excessively low, so the topcoat layer is not properly formed, which is undesirable.

[0046] In addition, the polysiloxane imide is contained in an amount of 1 to 3 parts by weight and plays a role in improving the hardness and adhesion strength of the topcoat layer. If the content of the polysiloxane imide is less than 1 part by weight, the above effect is negligible, and if the content of the polysiloxane imide exceeds 3 parts by weight, the above effect is not significantly improved, the coating performance of the topcoat composition is reduced, and it is undesirable because it becomes difficult to apply coating processes such as dip coating due to the increase in solid components.

[0048] Hereinafter, a method for manufacturing a coating composition for stainless steel that achieves high durability and release properties according to the present invention, and the physical properties of stainless steel formed with a coating layer made of the coating composition, will be explained with reference to examples.

[0050] <Preparation Example 1> Preparation of a release agent

[0051] A release agent was prepared by mixing 100 parts by weight of hydroxy silicone oil, 50 parts by weight of 3-glycidoxypropyltrimethoxysilane, 7.5 parts by weight of octamethylcyclotetrasiloxane, and 2.5 parts by weight of castor oil.

[0053] <Preparation Example 2> Preparation of porous ceramic particles supported with a release agent

[0054] Zeolite (200 mesh, porosity 35%, pore diameter 50 to 100 nm) is added to 95% ethanol by mass and left for 1 hour, after which only the powder is separated and dried in an oven at 50°C, then vacuum dried by maintaining it in a vacuum dryer maintained at 20°C for 10 minutes, the vacuum-dried zeolite is added to an aqueous copper ion solution (metal ion concentration 5 wt%) and mixed for 40 minutes at a stirring speed of 20 rpm to prepare a mixed dispersion, ascorbic acid is added in an equivalent amount or more to the prepared mixed dispersion and reacted by mixing at a stirring speed of 20 rpm for 20 minutes, and only the solid is filtered using a vacuum filter, the filtered solid is washed 6 times with purified water, and dried in a vacuum dryer to a moisture content of 10% or less to prepare zeolite with copper coated in the pores, and the prepared zeolite is subjected to the release agent prepared through Preparation Example 1 above Porous ceramic particles supported with a release agent were prepared by mixing with an auxiliary agent, stirring at a speed of 20 rpm for 3 hours, and then letting it stand for 24 hours.

[0056] <Preparation Example 3> Preparation of a primer coating composition

[0057] A mixture consisting of 110 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.7 parts by weight of hydrochloric acid, and 15 parts by weight of distilled water was slowly dropped into an Erlenmeyer flask, sealed, and stirred for 2 hours while refluxing at a temperature of 79°C, then cooled to 21°C, and 100 parts by weight of porous ceramic particles supported with the release agent prepared in Preparation Example 2 and 0.7 parts by weight of sapphire nanopowder were mixed and sealed, and then stirred for 2 hours at a temperature of 21°C to prepare a primer coating composition.

[0059] <Preparation Example 4> Preparation of a primer coating composition

[0060] A mixture consisting of 100 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.5 parts by weight of hydrochloric acid, and 10 parts by weight of distilled water was slowly dropped into an Erlenmeyer flask, sealed, and stirred for 2 hours while refluxing at a temperature of 79°C, then cooled to 21°C, and then 100 parts by weight of porous ceramic particles supported with the release agent prepared in Preparation Example 2 and 0.5 parts by weight of sapphire nanopowder were mixed and sealed, and then stirred for 2 hours at a temperature of 21°C to prepare a primer coating composition.

[0062] <Preparation Example 5> Preparation of a primer coating composition

[0063] A mixture consisting of 120 parts by weight of 3-glycidoxypropyltrimethoxysilane, 1 part by weight of hydrochloric acid, and 25 parts by weight of distilled water was slowly dropped into an Erlenmeyer flask, sealed, and stirred for 2 hours while refluxing at a temperature of 79°C, then cooled to 21°C, and then 100 parts by weight of porous ceramic particles supported with the release agent prepared in Preparation Example 2 and 1 part by weight of sapphire nanopowder were mixed and sealed, and then stirred for 2 hours at a temperature of 21°C to prepare a primer coating composition.

[0065] <Preparation Example 6> Preparation of a primer coating composition

[0066] A mixture consisting of 110 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.7 parts by weight of hydrochloric acid, and 15 parts by weight of distilled water was slowly dropped into an Erlenmeyer flask, sealed, and stirred for 2 hours while refluxing at a temperature of 79°C, then cooled to 21°C, and 100 parts by weight of porous ceramic particles supported with the release agent prepared in Preparation Example 2, 0.7 parts by weight of sapphire nanopowder, and 2.5 parts by weight of a vanadium component (vanadylacetylacetonate) were mixed, sealed, and stirred for 2 hours at a temperature of 21°C to prepare a primer coating composition.

[0068] <Preparation Example 7> Preparation of a primer coating composition

[0069] A mixture consisting of 100 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.5 parts by weight of hydrochloric acid, and 10 parts by weight of distilled water was slowly dropped into an Erlenmeyer flask, sealed, and stirred for 2 hours while refluxing at a temperature of 79°C, then cooled to 21°C, and 100 parts by weight of porous ceramic particles supported with the release agent prepared in Preparation Example 2, 0.5 parts by weight of sapphire nanopowder, and 2.5 parts by weight of a vanadium component (vanadylacetylacetonate) were mixed, sealed, and stirred for 2 hours at a temperature of 21°C to prepare a primer coating composition.

[0070] <Preparation Example 8> Preparation of a primer coating composition

[0071] A mixture consisting of 120 parts by weight of 3-glycidoxypropyltrimethoxysilane, 1 part by weight of hydrochloric acid, and 25 parts by weight of distilled water was slowly dropped into an Erlenmeyer flask, sealed, and stirred for 2 hours while refluxing at a temperature of 79°C, then cooled to 21°C, and 100 parts by weight of porous ceramic particles supported with the release agent prepared in Preparation Example 2, 1 part by weight of sapphire nanopowder, and 2.5 parts by weight of a vanadium component (vanadylacetylacetonate) were mixed, sealed, and stirred for 2 hours at a temperature of 21°C to prepare a primer coating composition.

[0073] <Preparation Example 9> Preparation of a topcoat composition

[0074] 100 parts by weight of 3-glycidoxypropyltrimethoxysilane were added to an Erlenmeyer flask, 35 parts by weight of distilled water containing 0.6 parts by weight of hydrochloric acid were slowly dropped in, the flask was sealed, stirred for 2 hours while refluxing at a temperature of 79°C, cooled to a temperature of 21°C, 100 parts by weight of colloidal silica (containing 30% by weight of solids) were added, the flask was sealed, and stirred for 2 hours at a temperature of 21°C, and 25 parts by weight of a dispersant (25 parts by weight of ethyl acetate mixed with 100 parts by weight of distilled water) and 2 parts by weight of polysiloxaneimide were mixed to prepare a topcoat composition.

[0076] <Example 1>

[0077] A substrate (stainless steel) was immersed in nitric acid and then washed to passivate it, and a primer coating composition prepared in Preparation Example 3 was coated to a thickness of 15 micrometers on the upper surface of the passivated substrate to form a primer coating layer, and then a top coating composition prepared in Preparation Example 9 was coated to a thickness of 5 micrometers on the upper surface of the primer coating layer to produce a substrate with a coating layer formed thereon.

[0079] <Example 2>

[0080] A substrate with a coating layer formed thereon was manufactured by proceeding in the same manner as in Example 1 above, but applying the undercoat coating composition prepared through Manufacturing Example 4 above.

[0082] <Example 3>

[0083] A substrate with a coating layer formed thereon was manufactured by proceeding in the same manner as in Example 1 above, but applying the undercoat coating composition prepared through Manufacturing Example 5 above.

[0085] <Example 4>

[0086] A substrate with a coating layer formed thereon was manufactured by proceeding in the same manner as in Example 1 above, but applying the undercoat coating composition prepared through Manufacturing Example 6 above.

[0088] <Example 5>

[0089] A substrate with a coating layer formed thereon was manufactured by proceeding in the same manner as in Example 1 above, but applying the undercoat coating composition prepared through Manufacturing Example 7 above.

[0091] <Example 6>

[0092] A substrate with a coating layer formed thereon was manufactured by proceeding in the same manner as in Example 1 above, but applying the undercoat coating composition prepared through Manufacturing Example 8 above.

[0094] <Comparative Example 1>

[0095] A substrate with a coating layer formed thereon was prepared in the same manner as in Example 1 above, except that instead of adding a release agent to the porous ceramic composition constituting the undercoat coating composition, an equal amount of hydroxy silicone oil was supported.

[0097] <Comparative Example 2>

[0098] A substrate with a coating layer formed thereon was prepared by applying a primer coating composition prepared by applying the composition, which was carried out in the same manner as in Example 1 above, but with the following steps: slowly dropping a mixture consisting of 50 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.2 parts by weight of hydrochloric acid, and 5 parts by weight of distilled water into an Erlenmeyer flask, sealing the flask, stirring for 2 hours while refluxing at a temperature of 79°C, cooling to 21°C, mixing 100 parts by weight of porous ceramic particles supported with a release agent prepared through Preparation Example 2 above and 0.7 parts by weight of sapphire nanopowder, sealing the flask, and stirring for 2 hours at a temperature of 21°C.

[0100] <Comparative Example 3>

[0101] A substrate with a coating layer formed thereon was prepared by applying a primer coating composition prepared by applying the composition, which was carried out in the same manner as in Example 1 above, but with the following steps: slowly dropping a mixture consisting of 200 parts by weight of 3-glycidoxypropyltrimethoxysilane, 2 parts by weight of hydrochloric acid, and 30 parts by weight of distilled water into an Erlenmeyer flask, sealing the flask, stirring for 2 hours while refluxing at a temperature of 79°C, cooling to 21°C, mixing 100 parts by weight of porous ceramic particles supported with a release agent prepared through Preparation Example 2 above and 0.7 parts by weight of sapphire nanopowder, sealing the flask, and stirring for 2 hours at a temperature of 21°C.

[0103] The wear resistance of the substrates with the coating layers formed through the above Examples 1 to 6 and Comparative Examples 1 to 3 was measured and is shown in Table 1 below.

[0104] {However, for wear resistance, a method was used in which the length of the worn width (donut shape) was measured after conducting a wear resistance test for 3 minutes by rotating the substrate with the coating layer formed thereon at a speed of 100 RPM and a load of 1 kg after mounting the ball.}

[0105]

[0106] As shown in Table 1 above, it can be seen that the substrate with the coating layer formed through Examples 1 to 6 of the present invention exhibits superior wear resistance compared to the substrate with the coating layer formed through Comparative Examples 1 to 3, and in particular, it can be seen that the wear resistance is further improved in the case of the substrate with the undercoat coating layer formed with an undercoat coating composition containing more vanadium components, such as in Examples 4 to 6.

[0108] In addition, the release properties of the substrates with the coating layers formed through Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated and are shown in Table 2 below.

[0109] {However, the evaluation of release properties was performed by drawing a circle with a diameter of 1 cm with an oil pen on a substrate with a coating layer formed at room temperature of 25℃ and measuring the degree to which it could be wiped off with a tissue after 5 minutes, and additionally, placing the substrate with the coating layer formed thereon into a convection oven at temperatures of 200℃ and 330℃ and heat-treating it for 1 hour, after which the release properties were measured in the same manner and presented according to the classification table below.

[0110] ○: Over 90% wiped, △: Partially wiped, ×: Almost not wiped

[0111]

[0112] As shown in Table 2 above, it can be seen that the substrate with the coating layer formed through Examples 1 to 6 of the present invention maintains release properties even after high-temperature heat treatment, whereas the substrate with the coating layer formed through Comparative Examples 1 to 3 does not maintain release properties properly under high-temperature conditions.

[0114] Accordingly, the coating composition for stainless steel having a nanolink pairing structure that implements high durability and release properties according to the present invention contains sapphire nanopowder, which improves the heat resistance and wear resistance of the coating layer formed on the stainless steel surface, thereby extending the service life and forming a coating layer with low surface roughness, thus providing stainless steel that can be applied as kitchenware exhibiting excellent release properties. Explanation of the symbols

[0115] S101 ; Stainless steel pretreatment step S103 ; Undercoat coating step S105 ; Topcoat coating step

Claims

Claim 1 A coating composition for stainless steel containing a sapphire component and having a nanolink pairing structure that achieves high durability and high release properties, characterized by comprising 100 parts by weight of porous ceramic particles supported with a release agent, 100 to 120 parts by weight of 3-glycidoxypropyltrimethoxysilane, 0.5 to 1 part by weight of hydrochloric acid, 10 to 25 parts by weight of distilled water, and 0.5 to 1 part by weight of sapphire nanopowder, wherein the porous ceramic particles are composed of zeolite having a pore diameter of 10 to 1000 nanometers and copper coated inside the pores, and the release agent comprises 100 parts by weight of hydroxysilicone oil, 40 to 60 parts by weight of 3-glycidoxypropyltrimethoxysilane, 5 to 20 parts by weight of octamethylcyclotetrasiloxane, and 0.5 to 5 parts by weight of castor oil. Claim 2 The stainless steel coating composition for achieving high durability and release properties according to claim 1, wherein the composition further contains 0.5 to 5 parts by weight of a vanadium component per 100 parts by weight of porous ceramic particles, and wherein the vanadium component comprises one or more selected from the group consisting of vanadyl acetylacetonate, vanadium pentoxide, metavanadic acid, ammonium metavanadate, sodium metavanadate, vanadium oxytrichloride, vanadium trioxide, vanadium dioxide, vanadium oxysulfate, vanadium oxyacetylacetate, vanadium acetylacetate, and vanadium trichloride. Claim 3 A stainless steel pretreatment step for passivating the surface of stainless steel; a primer coating step for coating the surface of the stainless steel that has been passivated through the stainless steel pretreatment step with a coating composition that provides high durability and release properties according to any one of claims 1 to 2; A method for coating stainless steel, comprising: a topcoat coating step of coating a topcoat coating composition on the surface of stainless steel coated with a primer coating composition coated through the primer coating step; wherein the topcoat coating composition comprises 100 parts by weight of 3-glycidoxypropyltrimethoxysilane (GPTMS), 0.25 to 1 part by weight of hydrochloric acid, 20 to 50 parts by weight of distilled water, 75 to 125 parts by weight of colloidal silica, 15 to 25 parts by weight of a dispersant, and 1 to 3 parts by weight of polysiloxane imide, and wherein the dispersant is formed by mixing 20 to 30 parts by weight of ethyl acetate with 100 parts by weight of distilled water.

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