Ceramic coating composition with high-heat resistance and releasability comprising PFAS-free organic-inorganic composite, and manufacturing method thereof

Abstract

The present invention provides a ceramic coating composition comprising a PFAS-free organic-inorganic composite, and a manufacturing method thereof, the composition maintaining release properties even when subjected to high-heat treatment by having excellent high-heat resistance and releasability. The ceramic coating composition according to the present invention has characteristics suitable for application in kitchen supplies and the like.

Description

Ceramic coating composition having high heat resistance and release properties including PFAS-free organic-inorganic complex and method for producing the same

[0001] The present invention aims to provide a ceramic coating composition for coating kitchen utensils and the like, which maintains release properties even at high temperatures of 330°C or higher, and a method for producing the same.

[0002] A release agent is used to facilitate the release and removal of a specific substance from a surface. A surface coating agent having permanent release properties may have its surface coating layer having the release properties detached and / or worn away from the adherend through repeated use, or its lifespan may be reduced due to continuous heating and / or cooling cycles.

[0003] Another type of release agent is silicone, which can be utilized in the form of 1) application of a thin silicone sheet (optionally including an encapsulated reinforcing structure) laid flat on the cooking surface, 2) a thin coating of silicone sprayed (typically resins) and / or coated onto trays or pans (Bundy Pans), or 3) trays or pans molded from silicone (typically elastomeric silicone).

[0004] A thicker silicone coating may be used to increase the life of the silicone coating, however, the silicone may limit heat transfer from the heat source to the surface, thus increasing the time required to heat the food to an appropriate temperature or heating the food.

[0005] Surfaces coated with thin coatings, such as those using spray coatings, have a short usable lifespan due to the tendency of the silicone to separate and / or wear away from the substrate.

[0006] Typically, to facilitate heat transfer, the silicone coating is designed to maintain close surface-to-surface contact between the substrate and the silicone; however, due to the different coefficients of thermal expansion of the silicone and the substrate including the silicone coating, the silicone will eventually be released from the substrate surface after several baking cycles.

[0007] U.S. Patent Publication No. 2006 / 0102013 discloses a coating technology applied to the surface of cooking utensils and the like.

[0008] Meanwhile, fluororesin coating agents are constantly raising issues regarding their harmfulness to the human body. Therefore, there is a need to develop a silicone coating technology that can solve these issues, a coating composition that has better release properties and thermal conductivity, and an improved service life.

[0009] The purpose of the present invention is to provide a ceramic coating composition having high heat resistance and releasability by coating an adherend composed of metal, inorganic material, etc.

[0010] The present invention aims to provide a ceramic coating composition having improved service life and harmless to the human body.

[0011] The present invention also aims to provide a ceramic coating composition having properties suitable for application to kitchenware and the like.

[0012] In order to solve the above-described problem, a ceramic coating composition having high heat resistance and releasability containing a PFAS-free inorganic composite according to the present invention comprises a base coating composition coated on a surface of an adherend and a top coating composition coated on an upper portion coated with the base coating composition, wherein the base coating composition comprises porous ceramic particles having a plurality of pores formed on a surface and a releasable auxiliary composition supported in the plurality of pores, and the top coating composition comprises 35 to 55 wt% of 3-glycidoxypropyltrimethoxysilane (GPTMS), 0.05 to 0.2 wt% of hydrochloric acid, 4 to 10 wt% of distilled water, and 30 to 45 wt% of silica colloid.

[0013] In the present invention, the release auxiliary composition comprises 10 to 20 parts by weight of hydroxy silicone oil, 5 to 10 parts by weight of 3-glycidoxypropyltrimethoxysilane, 1 to 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.1 to 1 part by weight of castor oil, based on 100 parts by weight of the porous ceramic particles.

[0014] In the present invention, the porous ceramic particles may be characterized in that the pore diameter is 10 to 1000 nm (nanometers) and the inner surface of the pore is coated with metal.

[0015] In the present invention, the ceramic coating composition may maintain release properties at a temperature of 250 °C or higher.

[0016] The present invention also provides a method for producing a ceramic coating composition, comprising the steps of a) producing a base composition and b) producing a top coat composition, wherein the step of producing the base composition is a step of mixing and stirring porous ceramic particles having a plurality of pores formed on the surface and a release auxiliary composition supported in the plurality of pores and distilled water containing hydrochloric acid or nitric acid and 3-glycidoxypropyltrimethoxysilane, and the step of producing the top coat composition is a method for producing a ceramic coating composition, wherein the step of dispersing silica colloid in ethyl acetate and then uniformly mixing 3-glycidoxypropyltrimethoxysilane, hydrochloric acid, and distilled water.

[0017] The ceramic coating composition according to the present invention has high heat resistance and releasability when coated on an adherend composed of metal, ceramic, etc.

[0018] The ceramic coating composition according to the present invention has an improved service life and is harmless to the human body.

[0019] The ceramic coating composition according to the present invention has properties suitable for application to kitchenware, etc.

[0020] Hereinafter, each component of the present invention will be described in more detail so that a person having ordinary skill in the art to which the present invention pertains can easily practice it; however, this is only an example, and the scope of the rights of the present invention is not limited by the following contents.

[0021] As used herein, the terms "preferred" or "preferably" refer to embodiments of the invention that have particular advantages under specific conditions. However, other embodiments may also be preferred under the same or different conditions. Furthermore, the fact that one or more preferred embodiments are preferred does not imply that other embodiments are not useful, nor does it exclude other embodiments within the scope of the invention.

[0022] The term "comprises" as used herein is used to list materials, compositions, devices, and methods useful in the present invention, but is not limited to the listed examples.

[0023] In particular, the term "includes" in the present invention refers to various states such as a state including a component as it is, a state processed using a component as a precursor, a state satisfying a component after processing, etc., and is not limited to the listed examples.

[0024] The ceramic coating composition according to the present invention is applied to kitchen utensils that are exposed to high heat and require releasability, such as frying pans, oven trays, and oven molds, and that are exposed to high temperatures for a long period of time, and maintains releasability even after exposure to high temperatures, so that food does not stick to the kitchen utensils and can be easily separated.

[0025] In particular, the purpose is to present a ceramic coating composition that does not affect the health of the user by using a material with little harmfulness to the human body, such as silicone, without using a material that has raised concerns about harmfulness to the human body, such as existing perfluorinated compounds.

[0026] Specifically, existing silicone-based ceramic coatings use silicone oil that volatilizes at about 280°C to implement releasability, and thus, when coating kitchen utensils (frying pans, etc.), there is a problem that the oil volatilizes and the releasability is permanently lost when the temperature of the pan exceeds 280°C. The present invention relates to a ceramic coating that does not volatilize even at 330°C or higher and allows the oil to maintain releasability.

[0027] More specifically, it includes a base coating composition coated on the surface of an adherend and a top coating composition coated on the top of the base coating composition, the base coating composition including porous ceramic particles having a plurality of pores formed on the surface and a releasable auxiliary composition supported in the plurality of pores, and the top coating composition including 35 to 55 wt% of 3-glycidoxypropyltrimethoxysilane (GPTMS), 0.05 to 0.2 wt% of hydrochloric acid, 4 to 10 wt% of distilled water, and 30 to 45 wt% of silica colloid.

[0028] The above 3-glycidoxypropyltrimethoxysilane is a binder, and when added in an amount exceeding the above content, the content of other components is reduced, and in particular, the content of silica colloid is reduced, so that there may be a problem that the releasability on the surface of the top coating layer that coats the top coating composition that comes into direct contact with food, etc. is rather reduced, and when added in an amount less than the above content, the effect of the silicone oil component supplied from the lower coating layer being transferred and maintained to the top coating layer by the silica particles is reduced, so that the effect of maintaining the releasability is reduced, and there is a problem that the surface hardness is reduced.

[0029] If the content of the hydrochloric acid is less than the above content, the degree of polymerization of GPTMS is low, so the reaction cannot occur sufficiently, and if it is more than the above content, the reaction speed is too fast, making it difficult to achieve a homogeneous reaction, so there is a problem in that the coating layer is not formed uniformly.

[0030] In addition, if the content of the silica colloid is less than the above content, there may be a problem of reduced heat resistance, and if the content is more than the above content, there may be a problem of reduced transparency of the coating film or reduced durability of the top coating layer.

[0031] Meanwhile, the above-described undercoat composition comprises porous ceramic particles having a plurality of pores formed on the surface and a release auxiliary composition contained in the plurality of pores. In this case, the undercoat composition may further comprise a binder.

[0032] The above-mentioned release auxiliary composition may include 10 to 20 parts by weight of hydroxy silicone oil, 5 to 10 parts by weight of 3-glycidoxypropyltrimethoxysilane, 1 to 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.1 to 1 part by weight of castor oil, based on 100 parts by weight of the above-mentioned porous ceramic particles.

[0033] The above-mentioned release auxiliary composition contains hydroxy silicone oil and octamethyl cyclotetrasiloxane, and also includes a binder such as 3-glycidoxypropyltrimethoxysilane to prevent the silicone oil from being easily released or lost within the pores, thereby continuously supplying the silicone oil component to the top coating layer.

[0034] By continuously supplying these silicone oil components at low concentrations, it plays a role in maintaining excellent release properties of the topcoat coating layer.

[0035] Generally, even at temperatures above 250°C, where silicone oil evaporates, the silicone oil is not lost and is continuously supplied from the lower coating layer to the upper coating layer, thereby maintaining the release property for a long period of time. More preferably, the release property is maintained even at temperatures above 300°C, and most preferably, the release property is maintained for a long period of time even at temperatures above 330°C.

[0036] If the content of the above hydroxy silicone oil is excessive, there is a problem that the release property maintenance life is reduced and the surface hardness is lowered, and even if it is added in a smaller amount than the above content, there is a problem that the release property of the top coating layer is not maintained for a long period of time.

[0037] Meanwhile, the addition of the above-mentioned castor oil is intended to improve the compatibility between each component, and if added in an amount exceeding the above content, there is a problem in that the composition is not carried within the pores of the porous particles due to the remaining castor oil, and a residual amount of the composition remains.

[0038] The porous ceramic particles may have a pore diameter of 10 to 1000 nm (nanometers) and may have a metal coating on the inner surface of the pores.

[0039] Preferably, the diameter may be 100 to 150 nm, and the metal coated inside the pore is preferably copper. By coating the inside of the pore with copper metal, there is an advantage in that the composition is not easily lost outside the pore due to interaction between the coating surface and the release-assistant composition, and the release-assistant composition is gradually released according to the composition outside.

[0040] After immersing porous ceramic particles in an aqueous solution in which copper ions are dispersed, the particles are sufficiently mixed, and then a reducing agent is added thereto in an equivalent amount or more to reduce the metal, and then the outer surface of the particles is washed 5 to 8 times so that most of the coating layer formed on the surface is removed by washing, thereby maintaining the coating layer inside the pores.

[0041] The porous ceramic particles may be included in an amount of 30 to 45 wt% based on the total weight of the substrate composition, and 35 to 55 wt% of 3-glycidoxypropyltrimethoxysilane, 0.2 to 0.5 wt% of hydrochloric acid, and 5 to 12 wt% of distilled water may be included together.

[0042] If the content of 3-glycidoxypropyltrimethoxysilane is added in a smaller amount than the above content, the surface hardness of the coating film is reduced, and if it is added in an amount exceeding the above content, the adhesion to the top coating layer formed on top of the lower layer is reduced, and interlayer separation may occur.

[0043] If the content of hydrochloric acid is excessive, the degree of polymerization of 3-glycidoxypropyltrimethoxysilane is low, making it difficult to form a coating layer with sufficient strength and uniform thickness, and the coating layer formation time is excessively long, which reduces workability. In particular, in the case of the undercoat composition, a process step of additionally coating the topcoat composition is required, so that in order to improve workability, the content of hydrochloric acid can be configured to be higher than that of the topcoat composition described later, thereby ensuring rapid drying and workability.

[0044] Meanwhile, the above-mentioned coating composition comprises 35 to 55 wt% of 3-glycidoxypropyltrimethoxysilane, 0.05 to 0.2 wt% of hydrochloric acid, 4 to 10 wt% of distilled water, and 30 to 45 wt% of silica colloid.

[0045] When the content of 3-glycidoxypropyltrimethoxysilane is added in a smaller amount than the above content, the surface hardness of the coating film is reduced, and when it is added in an amount exceeding the above content, it is difficult to form a uniform coating layer, or even though the silicone oil component should be supplied at a certain concentration in the lower coating layer to maintain the release property, the penetration rate of the silicone oil into the upper coating layer is low, which causes the release property to be reduced.

[0046] If the content of hydrochloric acid is excessive, the degree of polymerization of 3-glycidoxypropyltrimethoxysilane is low, making it difficult to form a coating layer with sufficient strength and uniform thickness, and the coating layer formation time is excessively long, which reduces workability. Unlike the previous undercoat composition, this is a layer that is exposed to the outer surface, and the purpose is to form a uniform and smooth surface by controlling the curing speed of the coating layer so that it is formed as a uniform layer with high surface hardness on the surface.

[0047] If the above silica colloid is added in an excessive amount, there is a problem in that it is difficult to form a uniform coating layer, and if it is added in a smaller amount than the above amount, there is a problem in that heat resistance and wear resistance are reduced.

[0048] Meanwhile, the above-mentioned composition may further contain other components such as dispersants and additives as needed.

[0049] For example, based on 100 parts by weight of the composition, 10 to 30 parts by weight of a dispersant prepared by dispersing polydimethylsiloxane powder (350 mesh) in a solvent containing distilled water and ethyl acetate in a weight ratio of 4:1 as a dispersant may be added, or 1 to 5 parts by weight of polysiloxane imide, an additive for improving hardness and adhesive strength, may be further included.

[0050] However, if added in excess of the above content, the coating property may be reduced or the solids may increase, making it unsuitable for performing a coating process such as dip coating.

[0051] The present invention also provides a method for producing the above-described ceramic coating composition.

[0052] Specifically, a method for producing a ceramic coating composition is provided, comprising a) a step of producing a lower coating composition and b) a step of producing a top coating composition, wherein the step of producing the lower coating composition is a step of mixing and stirring porous ceramic particles having a plurality of pores formed on the surface and a releasable auxiliary composition supported in the plurality of pores, 3-glycidoxypropyltrimethoxysilane, and distilled water containing hydrochloric acid, and wherein the step of producing the top coating composition is a step of uniformly mixing silica colloid, 3-glycidoxypropyltrimethoxysilane, hydrochloric acid, and distilled water.

[0053] More specifically, the step of manufacturing the above-mentioned coating composition may first be performed by degreasing and washing porous ceramic particles, adding a metal ion aqueous solution and mixing at a speed of 20 rpm for 40 to 60 minutes, and then adding a reducing agent such as ascorbic acid and mixing at a speed of 20 rpm for 20 to 40 minutes to form a reactive metal coating layer.

[0054] Next, after forming the metal coating layer, a step is performed to remove residues on the surface by washing the porous ceramic particles with purified water 5 to 8 times, and a step is performed to prepare them by drying them in a reduced pressure dryer to a moisture content of 10% or less.

[0055] Based on 100 parts by weight of the above powder (particle), 15 parts by weight of hydroxy silicone oil, 6 parts by weight of 3-glycidoxypropyltrimethoxysilane, 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.2 parts by weight of castor oil are stirred for 5 hours to prepare a mixed composition, and then the previously washed powder is mixed and stirred for 3 hours, and then maintained for 24 hours to prepare porous ceramic particles loaded with a release auxiliary composition, and then 3-glycidoxypropyltrimethoxysilane and distilled water containing hydrochloric acid are mixed and stirred to prepare a base composition.

[0056] The step of preparing the above composition first includes mixing silica colloid, 3-glycidoxypropyltrimethoxysilane, hydrochloric acid, and distilled water, and stirring while refluxing at 75 to 120°C for 100 to 140 minutes.

[0057] When the reflux temperature is lower than the above temperature, the two-dimensional polymerization reaction takes too much time, and when it is higher than the above temperature, the hydrolysis reaction is not smooth and the vapor pressure is high, so there is a risk of explosion during production.

[0058] If the stirring time is shorter than the above time, the polymerization reaction does not occur sufficiently, and if the stirring time is longer than the above time, the stirring time after the polymerization is completed becomes meaningless, so it is preferable to perform the reaction within the above time range in terms of manufacturing efficiency.

[0059]

[0060] Hereinafter, the present invention will be described in more detail based on examples, but these are only for the purpose of understanding the present invention and the scope of the present invention is not limited thereby.

[0061]

[0062] <Example 1>

[0063] Zeolite (200 mesh, porosity 35%, pore diameter 50 to 100 nm) was placed in 95% ethanol and left for 1 hour. Only the powder was separated and dried in an oven at 50°C. This was maintained in a depressurized dryer maintained at a temperature of 20°C for 10 minutes.

[0064] This was taken out, a copper ion aqueous solution (metal ion concentration 5 wt%) was prepared, the powder prepared previously was added, and mixed at a speed of 20 rpm for 40 minutes to prepare a mixed dispersion. Ascorbic acid was added here in an amount greater than equivalent and reacted by mixing at a speed of 20 rpm for 20 minutes. Only the solid was filtered using a vacuum filter, and washed 5 times with purified water. It was prepared by drying in a vacuum dryer to a moisture content of 10% or less.

[0065] Separately, based on 100 parts by weight of the above powder, 15 parts by weight of hydroxy silicone oil, 6 parts by weight of 3-glycidoxypropyltrimethoxysilane, 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.2 parts by weight of castor oil were stirred for 5 hours to prepare a mixed composition, and then the previously washed powder was mixed and stirred for 3 hours and maintained for 24 hours to prepare porous ceramic particles loaded with a release auxiliary composition.

[0066] 440 g of 3-glycidoxypropyltrimethoxysilane was placed in a 1 L Erlenmeyer flask, 45 g of distilled water containing 1.2 g of hydrochloric acid (43.2 g of distilled water + 1.8 g of hydrochloric acid) was slowly added dropwise, sealed, and stirred for 2 hours while refluxing at 78 to 80° C., then cooled to 20 to 22° C., 360 g of the supported porous ceramic particles were added, sealed, and further stirred at 20 to 22° C. for 2 hours to prepare a lower coating composition.

[0067] Separately, 500 g of 3-glycidoxypropyltrimethoxysilane was added to a 1 L Erlenmeyer flask, and 45 g of distilled water containing 1.5 g of hydrochloric acid (43.5 g of distilled water + 1.5 g of hydrochloric acid) was slowly dropped therein, sealed, and stirred for 2 hours while refluxing at 78 to 80°C, then cooled to 20 to 22°C, 400 g of colloidal silica (containing 30 wt% of solid content) was added, sealed, and stirred for an additional 2 hours at 20 to 22°C, and then 20 parts by weight of a dispersant prepared by dispersing polydimethylsiloxane powder (350 mesh) in a solvent in which distilled water and ethyl acetate were mixed in a weight ratio of 4:1, and 2 parts by weight of polysiloxane imide were mixed therein to prepare a topcoat composition.

[0068]

[0069] <Comparative Example 1>

[0070] In the above example, the porous ceramic composition of the lower composition was manufactured in the same manner except that instead of adding the release auxiliary composition, an equal amount of hydroxy silicone oil was loaded.

[0071]

[0072] <Comparative Example 2>

[0073] In the above example, the release auxiliary composition of the lower composition was manufactured by the same method except that instead of manufacturing the composition by adding 15 parts by weight of hydroxy silicone oil, 6 parts by weight of 3-glycidoxypropyltrimethoxysilane, 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.2 parts by weight of castor oil based on 100 parts by weight of the powder, the composition was manufactured by adding 5 parts by weight of hydroxy silicone oil, 12 parts by weight of 3-glycidoxypropyltrimethoxysilane, 7 parts by weight of octamethyl cyclotetrasiloxane, and 0.2 parts by weight of castor oil.

[0074]

[0075] <Comparative Example 3>

[0076] In the above example, the release auxiliary composition of the lower composition was manufactured by the same method except that instead of manufacturing the composition by adding 15 parts by weight of hydroxy silicone oil, 6 parts by weight of 3-glycidoxypropyltrimethoxysilane, 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.2 parts by weight of castor oil based on 100 parts by weight of the powder, the composition was manufactured by adding 5 parts by weight of hydroxy silicone oil, 4 parts by weight of 3-glycidoxypropyltrimethoxysilane, 15 parts by weight of octamethyl cyclotetrasiloxane, and 0.2 parts by weight of castor oil.

[0077]

[0078] [Experimental Method]

[0079] 1. Coating process evaluation

[0080] After spray coating with a thickness of 35 to 40 microns on an aluminum die-casting substrate that had been sanded using a coating agent according to each example and comparative example, heat treatment was performed at 270°C for 10 minutes to form lower and upper coating layers, respectively. Then, the thickness of the coating layer was measured to evaluate whether the coating layer was formed with a uniform thickness.

[0081] Whether it is formed with a uniform thickness is described by the relative ratio range of the minimum thickness and maximum thickness from the average thickness.

[0082]

[0083] Whether a uniform coating is formed (relative ratio to average, %, minimum ratio to maximum ratio) Examples 195 to 104 Comparative Examples 188 to 110 Comparative Examples 292 to 103 Comparative Examples 396 to 108

[0084] 2. Surface hardness measurement Surface hardness was measured using a pencil hardness tester (221-D). A 1~9H pencil was fixed to each sample and moved left and right to measure the degree of peeling of the coating.

[0085] Pencil hardness Example 110H Comparative Example 19H Comparative Example 210H Comparative Example 310H

[0086] 3. Wear resistance evaluation: After mounting the ball, the substrate was rotated at a speed of 100 RPM under a load of 1 kg for 3 minutes to conduct a wear resistance test, and the length of the worn width (donut shape) was measured.

[0087] Wear width (mm) Example 11.185 Comparative example 11.465 Comparative example 21.299 Comparative example 31.246

[0088] 4. Evaluation of heteromorphism The heteromorphism was measured by applying oil to a round hole with a grease pen and wiping it with a toilet paper. In addition, after heat treatment for 1 hour in a convection oven at temperatures of 200℃ and 300℃, the evaluation was conducted using the same method.

[0089] O: More than 90% wiped, △: Partially wiped, X: Almost not wiped

[0090] Heteromorphism (25°C) Heteromorphism (200°C) Heteromorphism (330°C) Example 1OOO Comparative Example 1OXX Comparative Example 2O△X Comparative Example 3O△X

[0091] 5. Hazardous substance detection test A hazardous substance detection test was conducted on the coating layer of Example 1.

[0092] 1) PFOS / PFOA,

[0093] 2) Heavy metals (Cadmium / Lead / Mercury / Hexavalent Chromium)

[0094] 3) [KS I ISO 16000-3.6.9] (TVOCs, Benzene, Toluene, Ethylbenzene, Xylene, Styrene, Formaldehyde, Acetaldehyde)

[0095] The test results confirmed that all of the above items were “not detected.”

[0096] Referring to Tables 1 to 4 above, it can be confirmed that when a ceramic coating agent manufactured according to an example is used, a uniform coating layer can be formed, and the surface hardness is excellent, and both wear resistance and release properties are excellent.

[0097] In particular, in the case of Comparative Example 1, it can be confirmed that there is a problem in that the surface is soft, a relatively uniform coating layer is not formed, and thus the release property is also lost after high-temperature heat treatment.

[0098] Meanwhile, in the case of comparative examples 2 and 3, the surface hardness and wear resistance are good, but it can be confirmed that the high heat resistance is lower than that of the examples because the release property is lost after heat treatment at high temperatures.

[0099] Accordingly, it can be confirmed that the ceramic coating composition according to the present invention, as in the example, has high heat resistance while maintaining good surface hardness and wear resistance, and has the effect of maintaining release properties even after high-temperature heat treatment.

[0100] In addition, Example 1 was confirmed as not detecting any hazardous substances in the test results, confirming that there is no problem with hazardous substances.

Claims

1. A ceramic coating composition having high heat resistance and release properties containing a PFAS-free inorganic complex, A coating composition to be coated on the surface of the adhesive and Including a top coating composition coated on the upper surface of the above-mentioned lower coating composition, The above composition comprises porous ceramic particles having a plurality of pores formed on the surface and a release auxiliary composition contained in the plurality of pores. The above-mentioned coating composition is a ceramic coating composition comprising 15 to 30 wt% of 3-glycidoxypropyltrimethoxysilane (GPTMS), 0.05 to 0.2 wt% of hydrochloric acid, 4 to 10 wt% of distilled water, and 15 to 25 wt% of silica colloid.

2. In paragraph 1, The above-mentioned release auxiliary composition is a ceramic coating composition comprising 10 to 20 parts by weight of hydroxy silicone oil, 5 to 10 parts by weight of 3-glycidoxypropyltrimethoxysilane, 1 to 3 parts by weight of octamethyl cyclotetrasiloxane, and 0.1 to 1 part by weight of castor oil, based on 100 parts by weight of the above-mentioned porous ceramic particles.

3. In paragraph 1, The above porous ceramic particles have pore diameters of 10 to 1000 nm (nanometers), A ceramic coating composition characterized in that the inner surface of the pore is coated with metal.

4. In paragraph 1, The above ceramic coating composition is a ceramic coating composition that maintains release properties at a temperature of 250 °C or higher.

5. A method for manufacturing a ceramic coating composition according to Article 1, a) Step for manufacturing a substrate composition and b) Step of manufacturing a commercial composition Including, The step of manufacturing the above-mentioned coating composition is a step of mixing and stirring porous ceramic particles having a plurality of pores formed on the surface and a release auxiliary composition supported in the plurality of pores and distilled water containing hydrochloric acid or nitric acid and 3-glycidoxypropyltrimethoxysilane (GPTMS). The step of manufacturing the above composition is to disperse silica colloid in ethyl acetate and then uniformly mix 3-glycidoxypropyltrimethoxysilane, hydrochloric acid, and distilled water. Method for producing a ceramic coating composition.