Method for manufacturing ceramic coating

Abstract

A method for manufacturing a ceramic coating is provided, the method comprising: preparing a ceramic coating; and forming the ceramic coating on a substrate using a layer-forming process, wherein the method for preparing the ceramic coating comprises: preparing a ceramic coating precursor; preparing slow-release particles; and mixing the ceramic coating precursor with the slow-release particles to obtain the ceramic coating. The slow-release particles comprise a slow-release material and silicone oil bound to the slow-release material. The slow-release material comprises at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate, and layered sulfate.

Description

Technical Field

[0001] The present invention relates to a method for producing a ceramic coating. Background Art

[0002] Currently, non-stick coatings primarily fall into two categories: PTFE and ceramic. Ceramic coatings, however, are subject to significant limitations due to their short lifespan. They are far less widely used than PTFE and fall short of consumers' daily demands for non-stick utensils. For example, a typical non-stick pan will begin to stick after about a month of use. This is especially true with high-temperature cooking methods like Chinese cooking, and with the wear of metal spatulas, which can cause the non-stick properties to degrade rapidly.

[0003] Therefore, improving the long-lasting non-stick properties of ceramic coatings has become a very meaningful and urgent technical need. Summary of the Invention

[0004] Based on the above-mentioned deficiencies in the prior art, the present invention provides a method for forming a ceramic coating using a ceramic coating including slow-release particles.

[0005] According to one aspect of the exemplary embodiment, a method for manufacturing a ceramic coating includes: separately preparing a ceramic coating precursor and slow-release particles, and mixing them to prepare a ceramic coating; and forming the ceramic coating on a substrate using a layer-forming process using the ceramic coating. The slow-release particles include a slow-release material and silicone oil bound to the slow-release material, wherein the slow-release material includes at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate, and layered sulfate.

[0006] The steps of preparing a ceramic coating precursor may include:

[0007] S1: providing material A, material B, and material C, wherein: material A comprises a silane substance; material B comprises silica sol and a filler as essential components, and optionally a pigment, a wetting agent, a thickener, and an emulsifier as unnecessary components, and a solvent; material C comprises an organic acid as an essential component, and optionally a pH buffer and a catalyst as unnecessary components;

[0008] S2: mixing material B and material C, and adjusting the pH of the mixture to acidic, thereby obtaining a first material;

[0009] S3: Mixing the A material with the first material to obtain a ceramic coating precursor.

[0010] According to another exemplary embodiment, a method for manufacturing a ceramic coating includes: preparing a ceramic coating; and forming the ceramic coating on a substrate using the ceramic coating using a layer-forming process, wherein the step of preparing the ceramic coating includes: preparing a material A comprising a silane substance, a material B comprising a silica sol and a filler, a material C comprising an organic acid, and slow-release particles; mixing the material B with the material C and adjusting the pH of the mixture to an acidic state to obtain a first material; and mixing the first material with the material A and the slow-release particles, and reacting the mixture to obtain the ceramic coating. The slow-release particles include a slow-release material and silicone oil bound to the slow-release material, wherein the slow-release material includes at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate, and layered sulfate.

[0011] The particle size of the sustained-release particles may be less than or equal to 20 microns.

[0012] The step of preparing the sustained-release granules may include: providing a sustained-release material and silicone oil; mixing 35-58 parts by weight of the sustained-release material with 42-60 parts by weight of the silicone oil, so that the silicone oil is combined with the sustained-release material to obtain the sustained-release granules.

[0013] The step of preparing the sustained-release particles may further include: controlling the particle size of the sustained-release particles to be less than or equal to 20 microns by a grinding process.

[0014] In the step of preparing the sustained-release particles, the silicone oil can be evenly mixed with the sustained-release material with a particle size of 100 mesh to 3000 mesh and ground to a particle size of less than or equal to 30 microns, and then a catalyst is added and the grinding is continued to a particle size of less than or equal to 20 microns to obtain sustained-release particles with a particle size of less than or equal to 20 microns.

[0015] After grinding, the resultant may be treated with ultrasonic waves.

[0016] In terms of weight percentage, the silicone oil may include 20%-30% of low molecular weight silicone oil, 40%-60% of medium molecular weight silicone oil, and 20%-30% of high molecular weight silicone oil, wherein the molecular weight of the low molecular weight silicone oil may be between 500-1000, the molecular weight of the medium molecular weight silicone oil may be between 3000-6000, and the molecular weight of the high molecular weight silicone oil may be between 12000-30000.

[0017] The slow-release particles may be included in an amount of 5.15-32.79 parts by weight per 100 parts by weight of the ceramic coating.

[0018] The silane material may include at least one of methyltrimethoxysilane, methyltriethoxysilane, and dimethyldimethoxysilane.

[0019] The material A may further include tetraethyl orthosilicate, and in the material A, the silane substance accounts for 80%-97% by weight, and the tetraethyl orthosilicate accounts for 3%-20% by weight. The ceramic coating may include at least one layer.

[0020] The ceramic coating may have a thickness of 10 micrometers to 80 micrometers.

[0021] The present invention provides a method for forming a disordered porous and / or layered structure by adding slow-release particles containing a slow-release material to a ceramic coating. In this case, silicone oil can be bound to the slow-release material. Therefore, during cooking, the porous and / or layered structure of the slow-release material can slow the release of silicone oil, thereby maintaining a long-lasting non-stick effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram illustrating a ceramic coating according to an exemplary embodiment;

[0023] Figure 2 is a schematic enlarged view showing slow-release particles in a ceramic coating according to an exemplary embodiment. DETAILED DESCRIPTION

[0024] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.

[0025] Ceramic coatings achieve their non-stick properties primarily through the use of silicone methyl groups and the addition of silicone oil. As the product is exposed to heat and wear during use, the silicone oil in the coating is gradually lost, damaging the silicone methyl groups on the surface and ultimately losing the non-stick effect, leading to sticking in cooking. If ceramic coatings could be made to continuously store oil, they could form an effective oil film that isolates food from the coating surface, achieving long-lasting non-stick properties.

[0026] Therefore, the present invention provides a ceramic coating, which includes slow-release particles containing a slow-release material, and the slow-release material can have a disordered porous and / or layered structure, and silicone oil is combined (e.g., adsorbed, bonded) to the slow-release material. During the cooking process, the release of silicone oil is slowed down, thereby maintaining a long-lasting non-stick effect. However, the exemplary embodiments are not limited to this, and those skilled in the art can apply the ceramic coating to any existing technical field suitable for non-stick (such as non-stick coatings for cooking pots (e.g., frying spoons, rice cooker inner pots), inner and outer coatings of transportation pipelines, etc.) based on the concept of the present invention.

[0027] Figure 1 is a schematic diagram illustrating an embodiment of a ceramic coating according to an exemplary embodiment, Figure 2 is a schematic diagram showing the slow-release particles in the ceramic coating according to an exemplary embodiment. Figure 1 and Figure 2 The method of manufacturing a ceramic coating according to the present invention will be described.

[0028] The method of manufacturing a ceramic coating according to the present inventive concept may include providing a substrate 100 and a ceramic coating; and forming a ceramic coating 200 on the substrate 100 using the ceramic coating using a layer forming process.

[0029] According to an exemplary embodiment, the substrate 100 may be a substrate known in the art for making cookware, and may include a stainless steel substrate, an iron substrate, an aluminum substrate, etc. However, the present invention is not limited to the material, use, or other properties of the substrate. In other words, those skilled in the art may use any material on which a ceramic coating is to be applied as the substrate 100 as needed.

[0030] Before, during, or after providing substrate 100, a ceramic coating can be prepared. According to exemplary embodiments, the ceramic coating can include a ceramic coating precursor 1 and slow-release particles 2 dispersed in the ceramic coating precursor. Therefore, the step of providing the ceramic coating can include the steps of separately preparing the ceramic coating precursor 1 and the slow-release particles 2, and then mixing the ceramic coating precursor 1 with the slow-release particles 2 to obtain the ceramic coating. Here, the ceramic coating precursor 1 can be equivalent to ceramic coatings used in the art and, therefore, can have the same components as conventional ceramic coatings in the art, thereby being prepared using methods known in the art for preparing ceramic coatings. However, exemplary embodiments are not limited thereto. As described below in conjunction with exemplary embodiments in the method for manufacturing a ceramic coating precursor 1 according to the present invention, the ceramic coating precursor 1 can be prepared using the method described below. Alternatively, one skilled in the art can combine the steps of preparing the ceramic coating precursor 1 with the steps of preparing the slow-release particles. The ceramic coating precursor 1 prepared using the method described below can exhibit superior non-stick properties, in combination with the slow-release particles. The redundant description of the manufacturing method of the ceramic coating in the related art will not be given here, and the method of preparing the ceramic coating according to the present inventive concept by separately preparing the ceramic coating precursor and the slow-release particles will be mainly described.

[0031] Preparation of ceramic coating precursors

[0032] According to an exemplary embodiment, the step of preparing the ceramic coating precursor may include a step of providing materials and a step of mixing.

[0033] The step of providing materials may include the steps of separately providing A material, B material, and C material.

[0034] Here, material A may include a silane substance, material B may include silica sol and filler as essential components, optional pigments, wetting agents, thickeners and emulsifiers as unnecessary components, and solvents, and material C may include an organic acid as an essential component, and optional pH buffers and catalysts (e.g., zirconium acetate) as unnecessary components.

[0035] In Material A, according to exemplary embodiments, a silane substance is used to form polysiloxane during the formation of the ceramic coating. Therefore, the silane substance here may include substances known in the art for polycondensation to form polysiloxane. According to exemplary embodiments, the silane substance may include at least one of methyltrimethoxysilane, methyltriethoxysilane, and dimethyldimethoxysilane, but is not limited thereto. Furthermore, in addition to the silane substance, Material A may also include tetraethyl orthosilicate, which polycondenses to form polysiloxane. In this case, the silane substance may comprise 80% to 97% of Material A by weight, and the tetraethyl orthosilicate may comprise 3% to 20% of Material A by weight.

[0036] Material B may necessarily include fillers and silica sol. Fillers enhance the wear resistance of the coating, among other things. Therefore, the present invention is not limited to the type of filler, and commonly used fillers may be selected. For example, at least one of mica powder, kaolin, montmorillonite, silicon carbide, aluminum oxide, and silicon dioxide may be selected. Furthermore, silica sol is the primary film-forming substance in ceramic coatings. It reacts with polysiloxane under acidic conditions to form a ceramic coating through a sol-gel reaction. Therefore, commercially available silica sol may be selected as the silica sol in Material B of the present invention. For example, the silica sol may be AkzoNobel 1050 (silica sol) or American Grace LUDIX AM-50.

[0037] The essential components of Material B can be dispersed in a solvent. That is, Material B can also include a solvent. Here, the solvent can include deionized water and, to regulate the solvent's volatilization rate during the coating drying process, can also include isopropyl alcohol. Furthermore, the ratio of isopropyl alcohol to water is unlimited, and the ratio of water to isopropyl alcohol can be selectively adjusted based on actual needs.

[0038] In addition to the essential components listed above, material B may optionally include one or more of a pigment, a wetting agent, a thickener, and an emulsifier as optional components. Pigments are primarily used to impart different colors to the coating, so common inorganic pigments can be used. Inorganic pigments offer excellent heat resistance and safety, and are therefore preferred for applications requiring high temperatures. According to exemplary embodiments, at least one of carbon black, copper chromium black, titanium dioxide, and iron oxide can be used as a filler. Furthermore, during the preparation of the essential components in a solvent, at least one of a wetting agent, a thickener, and an emulsifier can be added to the material to enhance its superior properties.

[0039] According to a specific example, the material B may include, by weight, 30-48 wt% of silica sol, 8-13 wt% of pigment, 8-25 wt% of filler, 0.2-1 wt% of wetting agent, 1-3 wt% of thickener, 3-5 wt% of emulsifier, and the balance being isopropyl alcohol and deionized water. However, exemplary embodiments are not limited thereto, and one or more of the unnecessary components may be omitted.

[0040] Material C serves as a strong acid catalyst and may include an organic acid as an essential component, and an optional pH buffer and catalyst (e.g., zirconium acetate) as optional components. The organic acid is used to adjust the pH of the silica sol in subsequent processes, enabling it to react with Material A in an acidic environment. Therefore, organic acids commonly used in ceramic coatings in the art can be used. According to exemplary embodiments, at least one of formic acid and acetic acid can be selected as the organic acid. When both formic acid and acetic acid are included, the weight ratio of formic acid to acetic acid can be between 4:6 and 1:1. Material C may also optionally include a pH buffer and catalyst. These pH buffers and catalysts can be known in the art for use in preparing strong acid catalysts for ceramic coatings. For example, the pH buffer can be a weak acid such as boric acid. The catalyst is used to accelerate the sol-gel reaction and can be zirconium acetate, for example. However, exemplary embodiments are not limited to the specific types of pH buffers and catalysts, and these can be omitted or appropriately selected based on existing knowledge.

[0041] According to an exemplary embodiment, the C material may include 80-97 parts by weight of a formic acid and acetic acid mixture, 1-2 parts by weight of a boric acid pH buffer, and 0.5 parts by weight of a zirconium acetate catalyst.

[0042] After providing the above-mentioned materials, a mixing step can be performed. In this article, the mixing step can include a first mixing step of mixing the B material with the C material and a second step of mixing the result of the first mixing step (ie, the first material described below) with the A material.

[0043] Specifically, 40-60 parts by weight of material B can be mixed with 1-2 parts by weight of material C, and the pH of the mixture can be adjusted to acidic (e.g., to less than or equal to 4) by utilizing the acidity of material C to obtain the first material. Since material C includes a solid filler and an optional pigment, before mixing or during the preparation of material C, material C can be added to a grinder and ground for 0.5-2 hours to fully disperse it and grind it to a particle size of less than or equal to 15 microns to obtain a uniformly dispersed slurry.

[0044] After the B material and the C material are mixed, the mixture may be tumbling dispersed for a predetermined time (eg, 0.5 h) so that the first material has a high degree of dispersion.

[0045] After obtaining the first material, material A can be added to the first material. Here, the weight ratio of material A to material B can be within a range of (20-30):(40-60). After adding material A, materials A and B can be shaken evenly to allow them to undergo a sol-gel reaction in an acidic environment, thereby forming a ceramic coating precursor.

[0046] Preparation of sustained-release granules

[0047] During, before, or after the preparation of the ceramic coating precursor, the slow-release particles can be prepared. The slow-release particles can be prepared by mixing the slow-release material with silicone oil.

[0048] According to an exemplary embodiment, the sustained-release particles 2 may include a sustained-release material 21 having a pore structure and / or a lamellar structure and a silicone oil 22 bound (eg, adsorbed, bonded) to the sustained-release material.

[0049] A slow-release material precursor of appropriate size (i.e., the slow-release material before grinding, when the grinding step is omitted, the slow-release material precursor can be considered as the slow-release material for final use) can be selected to prepare slow-release particles. According to an exemplary embodiment, the slow-release material precursor can have a layer gap and / or pore structure. According to an example, the slow-release material precursor can include at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate and layered sulfate. The slow-release material precursor has a porous and / or layered structure and the slow-release material formed after grinding is combined with silicone oil. The silicone oil combined with the slow-release material can be slowly released during the use of the cookware with the non-stick coating formed by the ceramic coating conceived by the present invention, thereby greatly improving the long-lasting non-stick performance of the non-stick layer formed by the ceramic coating.

[0050] According to an exemplary embodiment, the particle size of the sustained-release material precursor can be within the range of 100-3000 mesh (e.g., between a 100-mesh sieve and a 3000-mesh sieve), and the particle size of the sustained-release material within this range can follow a normal distribution. However, when the particle size is too large (e.g., above a 100-mesh sieve), the excessively large particle size can easily increase the grinding process or cause the particle size of the sustained-release material after grinding to be too large, ultimately affecting the appearance of the non-stick coating made using the ceramic coating. Conversely, when the particle size is too small (e.g., below a 3000-mesh sieve, and the particle size becomes even smaller after grinding), it is not easy to effectively adsorb and bond with silicone oil, thereby making it difficult to achieve a good silicone oil sustained-release effect.

[0051] When the sustained-release material precursor has the above-described particle size distribution, the particle size of the resulting sustained-release material can be reduced to 20 microns or less using two grinding processes, as described below. However, exemplary embodiments are not limited thereto. Specifically, when the sustained-release material precursor is selected to have a smaller particle size within the range of 100-3000 mesh, one grinding process can be omitted. Furthermore, when the particle size of the sustained-release material precursor is selected to have an even smaller particle size within the above-described range, both grinding processes can be omitted. When at least one of the grinding processes is omitted, the omitted grinding process can be replaced by a stirring process, or the mixture can be left untreated.

[0052] According to an exemplary embodiment, the silicone oil 22 is bound (e.g., adsorbed, bonded) to the sustained-release material 21 and provides the main non-stick properties for the ceramic coating. The silicone oil can be selected from at least one of methyl silicone oil, dimethyl silicone oil, hydroxy silicone oil, hydrogen silicone oil, and polyether-modified silicone oil, and can be mixed in a certain proportion by silicone oils of different molecular weights to form a silicone oil composition with a molecular weight normal distribution; wherein, by weight percentage, the low molecular weight silicone oil content can be 20wt%-30wt%, the medium molecular weight silicone oil content can be 40wt%-60wt%, and the high molecular weight silicone oil content can be 20wt%-30wt%. Here, the molecular weight of the low molecular weight silicone oil can be between 500-1000, the molecular weight of the medium molecular weight silicone oil can be between 3000-6000, and the molecular weight of the high molecular weight silicone oil can be between 12000-30000. By utilizing a normally distributed silicone oil composition, the sustained-release and non-stick effects can be better exerted. This is because: high molecular weight silicone oils bond more firmly to the sustained-release material, resulting in a slower release rate; low molecular weight silicone oils offer greater mobility, resulting in better non-stick properties; and medium molecular weight silicone oils offer a balance of mobility and strong bonding. Therefore, low, medium, and high molecular weight silicone oils can be combined to achieve better sustained-release and non-stick properties.

[0053] According to an example, 35-58 parts by weight of a slow-release material precursor can be mixed with 42-60 parts by weight of silicone oil to obtain a mixture, and 1 part by weight of a coupling agent (e.g., a methoxysilane coupling agent), 0.3 parts by weight of a catalyst (e.g., a titanate catalyst), and 1-1.5 parts by weight of a dispersant can be added to the mixture to prepare slow-release particles. Here, the coupling agent and the catalyst are used to enhance the binding force between the silicone oil and the slow-release material, and the dispersant is used to improve the dispersion of the slow-release material in the silicone oil. Therefore, the exemplary embodiment is not limited to the case where the coupling agent, the dispersant, and the catalyst are included, and at least one of the coupling agent, the catalyst, and the dispersant can be omitted.

[0054] According to a specific example, the silicone oil, the slow-release material precursor with a particle size of 100 mesh sieve to 3000 mesh sieve and the silane coupling agent can be mixed evenly according to the above ratio, and ground to a particle size of less than or equal to 30 microns, and then the catalyst is added, and the grinding is continued to a particle size of less than or equal to 20 microns, and then ultrasonically treated at room temperature (e.g., 22 ° C) for 0.5h-1h, so that the slow-release particles can be obtained. Here, first mixing the silicone oil with the slow-release material precursor and then grinding it to a particle size of less than or equal to 30 microns can make the silicone oil and the slow-release material mixed evenly, and then grinding it under the condition of the catalyst to a particle size of less than or equal to 20 microns can make the silicone oil fully adsorbed and bonded to the outside of the slow-release material. However, when the particle size of the slow-release material precursor is less than 30 microns, the first grinding can be omitted, and optionally a stirring process can be provided, or the second grinding process can be directly performed. In addition, when the particle size of the sustained-release material precursor is less than 15 μm, the second grinding process can be further omitted. In this case, the sustained-release material precursor is equivalent to the sustained-release material to be finally used, and a stirring process can be optionally provided.

[0055] Preparation of ceramic coatings

[0056] After the ceramic coating precursor and the slow-release particles are prepared, the slow-release particles can be mixed with the ceramic coating precursor to prepare a ceramic coating according to an exemplary embodiment.

[0057] According to an exemplary embodiment, during the preparation of the ceramic coating, 61-92 parts by weight of a ceramic coating precursor and 5-30 parts by weight of slow-release particles may be mixed based on the total weight of the ceramic coating (for example, the weight ratio of A, B, C, and slow-release particles D may be (20-30):(40-60):(1-2):(5-30)). After the ceramic coating precursor and the slow-release particles are mixed, the mixture may be stirred at a speed of 120 rpm to 200 rpm for 6 to 8 hours to obtain the desired ceramic coating.

[0058] Additionally, while the above method describes separately preparing a ceramic coating precursor and slow-release particles and then mixing them to obtain a ceramic coating, in a method combining the steps of preparing the ceramic coating precursor with the steps of preparing the slow-release particles, as described above, after mixing material B and material C, material A and the slow-release particles can be simultaneously added to the mixture. For example, 40-60 parts by weight of material B can be mixed with 1-2 parts by weight of material C, and the pH of the mixture can be adjusted to an acidic level (e.g., less than or equal to 4) due to the acidity of material C to obtain the first material. Material A and the slow-release particles can then be added to the mixture. The weight ratio of material A to slow-release particles to material B can be in the range of (20-30):(5-30):(40-60). After mixing, the mixture can be stirred at 120-200 rpm for 6-8 hours to obtain the desired ceramic coating.

[0059] Preparation of ceramic coatings

[0060] After the ceramic paint is obtained, a ceramic coating layer may be formed on the substrate 100 using the ceramic paint through a layer forming process.

[0061] For example, the ceramic coating can be sprayed using air spraying. Here, the air spraying parameters are as follows: the spraying distance is 160 mm; the air pressure is 0.3 MPa; and the flow rate is 8 L / min. However, the exemplary embodiment is not limited thereto, and those skilled in the art can use other layer-forming methods to form a ceramic coating using the ceramic coating conceived by the present invention. In addition, in order to improve the bonding force between the ceramic coating 200 and the substrate 100, the substrate can be treated. For example, the substrate can be sandblasted with 60# brown corundum to form a surface roughness of 3-6 microns, and then the substrate can be cleaned and preheated to 40°C to 60°C before the ceramic coating formation process is carried out.

[0062] After air spraying, the resultant may be cured at a temperature of 230° C. to 280° C. for 10 min to 15 min to form a ceramic coating with a thickness of 10 μm to 80 μm.

[0063] As described above in detail in conjunction with exemplary embodiments, the ceramic coating of the present invention includes slow-release particles. Therefore, during the cooking process, the release of silicone oil can be slowed down, thereby maintaining a long-lasting non-stick effect.

[0064] Hereinafter, the beneficial effects of the inventive concept will be described with reference to specific examples.

[0065] Example 1

[0066] The ceramic coating is formed by the following method.

[0067] S1: 80 wt% of methyltrimethoxysilane and 20 wt% of ethyl orthosilicate were mixed and stirred to obtain a silane composition of component A;

[0068] S2: 30 wt% of Akzo Nobel 1050 (silica sol), 8 wt% of titanium dioxide (pigment), 25 wt% of kaolin (filler), 3 wt% of Tween-80 (emulsifier), 1 wt% of water-based modified bentonite (thickener), 0.3 wt% of polyoxyethylene ether TRITONX-100 (wetting agent), 20 wt% of isopropyl alcohol and the balance of deionized water were mixed uniformly, and then added to a grinder and ground for 2 h to fully disperse and grind to a particle size of not more than 15 μm to obtain a component B slurry;

[0069] S3: 48 parts by weight of formic acid, 48 parts by weight of acetic acid, 1 part by weight of boric acid (buffer), and 0.5 parts by weight of zirconium acetate (catalyst) are uniformly mixed to obtain component C, a strongly acidic catalyst;

[0070] S4: Mix 58 parts by weight of hydroxy silicone oil with a molecular weight of 3000 with 42 parts by weight of vermiculite with a particle size of 100 to 3000 mesh (sustained-release material), then add 3 parts by weight of methoxysilane coupling agent and mix evenly. Grind to a particle size of no more than 30 microns, add 0.3 parts by weight of titanate (catalyst), continue grinding to a particle size of no more than 20 microns, and then ultrasonically treat at room temperature of 22°C for 0.5h to obtain a sustained-release particle component D, and the particle size of the sustained-release particle component D obeys a normal distribution.

[0071] S5: The above four components are sequentially mixed in a weight ratio of A:B:C:D = 22:40:1:20, and tumble-cured to obtain a ceramic coating. The mixing sequence and aging method are as follows: First, 40 parts by weight of component B and 1 part by weight of component C are mixed evenly, using component C to adjust the pH to 4. The mixture is then tumble-cured for 0.5 hours. Then, 22 parts by weight of component A is added and shaken evenly. Then, 20 parts by weight of component D is added. The mixture is stirred at 200 rpm for 8 hours to obtain the desired ceramic coating.

[0072] The ceramic coating is used to produce non-stick cookware by the following method.

[0073] S6: Substrate treatment: The stainless steel substrate is sandblasted with 60# brown corundum to form a surface roughness of 3 microns;

[0074] S7: Preheating. Clean the sandblasted substrate and preheat it to 60°C.

[0075] S8: Spraying. The modified ceramic coating was sprayed using air spraying, with a spray film thickness of 70 μm. The air spraying parameters were as follows: spraying distance 160 mm, air pressure 0.3 MPa, and flow rate 8 L / min.

[0076] S9: Sintering: Curing at 250°C for 10 minutes.

[0077] By the above method, the non-stick cookware of Example 1 is obtained.

[0078] Example 2

[0079] The difference from Example 1 is that the sustained-release material is bentonite.

[0080] Example 3

[0081] The difference from Example 1 is that the sustained-release material is alpha alumina.

[0082] Example 4

[0083] The difference from Example 1 is that the particle size of the slow-release particles is less than or equal to 17 microns, and the particle size of the slow-release particle component D obeys a normal distribution.

[0084] Example 5

[0085] The difference from Example 1 is that the particle size of the slow-release particles is less than or equal to 12 microns, and the particle size of the slow-release particle component D obeys a normal distribution.

[0086] Example 6

[0087] The difference from Example 1 is that the particle size of the slow-release particles is less than or equal to 8 microns, and the particle size of the slow-release particle component D obeys a normal distribution.

[0088] Example 7

[0089] The difference from Example 1 is that the film thickness is 10 microns.

[0090] Example 8

[0091] The difference from Example 1 is that the film thickness is 40 microns.

[0092] Example 9

[0093] The difference from Example 8 is that A, B, C and D are mixed in sequence according to the weight ratio of A:B:C:D=30:60:2:5 to prepare the modified ceramic coating.

[0094] Example 10

[0095] The difference from Example 8 is that A, B, C and D are mixed in sequence according to the weight ratio of A:B:C:D=20:40:1:30 to prepare the modified ceramic coating.

[0096] Example 11

[0097] The difference from Example 1 is that the hydroxy silicone oil consists of 20 wt % of hydroxy silicone oil with a molecular weight of 800, 60 wt % of hydroxy silicone oil with a molecular weight of 3000 and 20 wt % of hydroxy silicone oil with a molecular weight of 12000.

[0098] Example 12

[0099] The difference from Example 1 is that the silicone oil consists of 30 wt % of hydroxy silicone oil with a molecular weight of 800, 40 wt % of hydroxy silicone oil with a molecular weight of 3000 and 30 wt % of hydroxy silicone oil with a molecular weight of 12000.

[0100] Example 13

[0101] The difference from Example 1 is that the silicone oil consists of 25 wt % of hydroxy silicone oil with a molecular weight of 800, 50 wt % of hydroxy silicone oil with a molecular weight of 3000 and 25 wt % of hydroxy silicone oil with a molecular weight of 12000.

[0102] Comparative Example 1

[0103] The difference from Example 1 is that step S4 is omitted. That is, in step S5, components A, B, and C are mixed in order according to a weight ratio of A:B:C=22:40:1, and the resulting ceramic material precursor is used to manufacture non-stick cookware.

[0104] Comparative Example 2

[0105] The difference from Example 1 is that 30 parts by weight of hydroxy silicone oil with a molecular weight of 3000 is mixed with 60 parts by weight of vermiculite.

[0106] Comparative Example 3

[0107] The difference from Example 1 is that 60 parts by weight of hydroxy silicone oil with a molecular weight of 3000 is mixed with 40 parts by weight of vermiculite.

[0108] The non-stick performance of the non-stick cookware of Examples 1-13 and Comparative Examples 1-3 was tested, and the test results are shown in the following table.

[0109] plan Long-lasting non-stickiness / times Example 1 21000 Example 2 18000 Example 3 19000 Example 4 20000 Example 5 18000 Example 6 16000 Example 7 11000 Example 8 16000 Example 9 14000 Example 10 25000 Example 11 22000 Example 12 23000 Example 13 25000 Comparative Example 1 500 Comparative Example 2 8000 Comparative Example 3 9000

[0110] Performance index test

[0111] The cookware obtained above was subjected to a performance test. The specific performance test method is as follows:

[0112] (1) Long-lasting non-stick test method: refer to 4.2.1 Fried egg non-stick test in GB_T 32095.2-2015. The unit is the number of times. The higher the number, the longer the life. The non-stick result is evaluated every 1000 times, and the number of times when the non-stickiness reaches level III is recorded.

[0113] (2) Plane wear resistance test method: GB_T 32095.2-2015 4.3.1 Plane wear resistance test, using 3M7447 scouring pad, applying a force of 15N, a frequency of 33 times / minute, and replacing the scouring pad every 500 times.

[0114] A comparative analysis of Examples 1-13 of the present invention with Comparative Examples 1-3 reveals that the conventional ceramic coating in Comparative Example 1 exhibits a sustained non-stick performance of no more than 500 times. The relatively low content of silicone oil in Comparative Example 2 prevents effective sustained-release effects. Furthermore, the low content of sustained-release material in Comparative Example 3, coupled with a low amount of silicone oil, prevents effective sustained-release effects. Compared to Comparative Examples 1-3, the ceramic coating according to the present invention exhibits superior sustained non-stick properties.

[0115] Although one or more embodiments of the present invention have been described with reference to the drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the claims.

Claims

1. A method for manufacturing a ceramic coating, characterized in that: The method comprises: preparing a ceramic coating precursor and slow-release particles separately and mixing them to prepare a ceramic coating; and forming the ceramic coating on a substrate using a layer-forming process using a ceramic coating, Wherein, the sustained-release particles include a sustained-release material and silicone oil bound to the sustained-release material. The sustained-release material comprises at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate and layered sulfate.

2. The method according to claim 1, wherein in, The steps of preparing a ceramic coating precursor include: Prepare material A containing a silane substance, material B containing silica sol and a filler, material C containing an organic acid, and slow-release particles; Mixing material B and material C, and adjusting the pH of the mixture to acidic, thereby obtaining a first material; The A material is mixed with the first material, and the mixture is reacted to obtain a ceramic coating precursor.

3. A method for manufacturing a ceramic coating, characterized in that: The method comprises: preparing a ceramic coating; and forming the ceramic coating on a substrate using the ceramic coating by a layer-forming process, wherein the step of preparing the ceramic coating comprises: Prepare material A comprising a silane substance, material B comprising silica sol and a filler, material C comprising an organic acid, and slow-release particles; Mixing material B and material C, and adjusting the pH of the mixture to acidic, thereby obtaining a first material; The first material is mixed with the A material and the slow-release particles, and the mixture reacts to obtain a ceramic coating. Wherein, the sustained-release particles include a sustained-release material and silicone oil bound to the sustained-release material. The sustained-release material comprises at least one of vermiculite, zeolite, bentonite, diatomaceous earth, alpha alumina, silica aerogel, fumed silica, amorphous silica, hollow glass powder, porous silicate, layered silicate, porous phosphate, layered phosphate, porous carbonate, layered carbonate, porous sulfate and layered sulfate.

4. The method according to any one of claims 1 to 3, wherein The steps for preparing sustained-release granules include: Provide sustained-release materials and silicone oil; Mixing 35-58 parts by weight of the sustained-release material with 42-60 parts by weight of silicone oil, so that the silicone oil is combined with the sustained-release material; and The sustained-release particles combined with silicone oil are ground using a grinding process to obtain sustained-release particles with a particle size of less than or equal to 20 microns.

5. The method according to claim 4, wherein In the grinding process, silicone oil is mixed evenly with a sustained-release material with a particle size of 100-3000 mesh and then ground to a particle size of less than or equal to 30 microns. A catalyst is then added and the mixture is further ground to a particle size of less than or equal to 20 microns to obtain sustained-release particles with a particle size of less than or equal to 20 microns.

6. The method according to any one of claims 1 to 3, wherein The slow-release particles are contained in 5.15-32.79 parts by weight per 100 parts by weight of the ceramic coating.

7. The method according to claim 4, wherein The steps of preparing the sustained-release granules further include: After grinding, the resultant was treated with ultrasonic waves.

8. The method according to any one of claims 1 to 3, wherein By weight percentage, the silicone oil includes 20%-30% of low molecular weight silicone oil, 40%-60% of medium molecular weight silicone oil, and 20%-30% of high molecular weight silicone oil. Among them, the molecular weight of low molecular weight silicone oil is between 500-1000, the molecular weight of medium molecular weight silicone oil is between 3000-6000, and the molecular weight of high molecular weight silicone oil is between 12000-30000.

9. The method according to any one of claims 1 to 3, wherein The ceramic coating is formed to include at least one layer using a layer-forming process, and has a thickness of 10 to 80 micrometers.

10. The method according to any one of claims 2 to 3, wherein: The silane substance includes at least one of methyltrimethoxysilane, methyltriethoxysilane and dimethyldimethoxysilane, and the material A also includes tetraethyl orthosilicate. Wherein, in the material A, the silane substance accounts for 80%-97% by weight, and the tetraethyl orthosilicate accounts for 3%-20% by weight.

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