Ceramic coating, cooking utensil, cooking utensil and preparation method of ceramic coating

Abstract

The invention discloses a ceramic coating, a cooking utensil, a cooker and a preparation method thereof.The ceramic coating comprises a coating A. The coating A is prepared from, by weight, 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 part of an acidic pH regulator, 0.5-1.5 parts of a dispersing agent and 1-10 parts of a first cosolvent, and the coating A is prepared from, by weight, 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 part of an acidic pH regulator, 0.5-1.5 parts of a dispersing agent and 1-10 parts of a second cosolvent; wherein the modified silane contains a polar functional group. According to the technical scheme, the surface energy of the ceramic coating is improved, decorative layers such as patterns or water lines and scale lines can be printed on the surface of the ceramic coating, and the adhesive force of surface decoration of the ceramic coating and the binding force of surface coating are further enhanced.

Description

Technical Field

[0001] This invention relates to the field of ceramic coating technology, and in particular to a ceramic coating, cooking utensils, cookware and their preparation methods. Background Technology

[0002] In related technologies, due to the low surface energy of ceramic coatings, most patterns, water level lines, or scale lines are created on the ceramic coating using embossing or laser engraving processes. However, embossing suffers from unclear and unattractive patterns, while laser engraving damages the ceramic coating, leading to a decrease in corrosion resistance. Alternatively, the primer of the ceramic coating can be sanded before printing patterns, water level lines, or scale lines, followed by a mid-coat or topcoat. However, this process is complex and costly, and sanding the primer can easily reduce corrosion resistance. Summary of the Invention

[0003] The main objective of this invention is to provide a ceramic coating, cooking utensils, cookware, and their preparation method, so as to improve the surface energy of the ceramic coating, which is beneficial for printing patterns or decorative layers such as water level lines and scale lines on the surface of the ceramic coating, and further enhances the adhesion of the ceramic coating surface decoration and the bonding force of the topcoat.

[0004] To achieve the above objectives, the present invention proposes a ceramic coating comprising a coating A, wherein the coating A comprises 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, and 1-10 parts of first cosolvent, wherein the modified silane contains polar functional groups.

[0005] In one embodiment, the polar functional group includes one or more of the following: mercapto, isocyanate group, urea group, glycidyl etheroxy group, epoxy group, chlorine, (meth)acryloyloxy group, and vinyl group.

[0006] In one embodiment, the modified silane comprises a silane containing chlorine, epoxy, mercapto, double bond, or isocyanate functional groups, and the silane includes a silane coupling agent with the general formula R. n SiX (4-n) In this context, R represents an organic functional group, such as vinyl, ethoxy, amino, epoxy, methacryloyloxy, or sulfhydryl; X represents a hydrolyzable alkoxy group, such as halogen, alkoxy, acyloxy, or methoxy; and n is an integer from 1 to 3, depending on the type and number of organic functional groups.

[0007] In one embodiment, the acidic pH adjuster includes one or more of organic and inorganic acids, and the pH value of the acidic pH adjuster is in the range of 2 to 5; and / or, the dispersant includes one or more of BYK180, BYK190, BYK2010, and BYK2001; and / or, the first cosolvent includes one or more of isopropanol, propylene glycol methyl ether, and diethylene glycol butyl ether.

[0008] In one embodiment, the coating A further includes pigments and fillers. Based on a total weight of 100 parts, the coating A includes 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, 1-10 parts of first co-solvent, 15-45 parts of pigments and fillers, and the remainder is deionized water.

[0009] In one embodiment, the ceramic coating includes coating B, which, based on a total weight of 100 parts, includes 18-27 parts of silica sol, 20-30 parts of methyltrimethoxysilane, 1-5 parts of non-sticking agent, and 0.1-0.5 parts of acidic pH adjuster.

[0010] In one embodiment, the coating B further includes a decorative agent, a wetting and leveling agent, and a second co-solvent. Based on 100 parts by weight of coating B, coating B includes 18-27 parts of silica sol, 20-30 parts of methyltrimethoxysilane, 0.5-1.5 parts of wetting and leveling agent, 1-5 parts of non-sticking agent, 1-10 parts of second co-solvent, 0.1-0.5 parts of acidic pH adjuster, 0.05-0.5 parts of decorative agent, and the remainder is deionized water.

[0011] The present invention also proposes a cookware, the cookware comprising a cookware substrate and a ceramic coating, the ceramic coating being a ceramic paint, wherein a first layer is formed on the surface of the cookware substrate by paint A, the side of the first layer facing away from the cookware substrate having a plurality of polar functional groups; the ceramic paint comprising paint A, based on a total weight of 100 parts, paint A comprising 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, 1-10 parts of first co-solvent, the remainder being deionized water; wherein the modified silane contains polar functional groups.

[0012] In one embodiment, the cookware further includes a decorative layer disposed on the side of the first layer opposite to the cookware substrate; and / or, the contact angle of the surface of the first layer is less than or equal to 75°.

[0013] In one embodiment, the ceramic coating further includes a second layer, the ceramic coating comprising coating B, the coating B covering the decorative layer and forming the second layer on the side of the first layer opposite to the cookware substrate; and / or, the decorative layer includes one or more combinations of patterns, text, characters, logos, lines, shapes, water level lines, and scale lines.

[0014] In one embodiment, the second layer is a light-transmitting layer that at least partially transmits light, making the decorative layer visible.

[0015] The present invention also proposes a cooking utensil, comprising a cooker base and a ceramic coating. The ceramic coating is a ceramic paint, wherein a first layer is formed on the surface of the cooker base by paint A, and the side of the first layer facing away from the cooker base has a plurality of polar functional groups. The ceramic paint comprises paint A, which, based on a total weight of 100 parts, comprises 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, and 1-10 parts of first cosolvent. The modified silane contains polar functional groups.

[0016] In one embodiment, the cooking appliance includes a rice cooker, pressure cooker, frying pan, wok, soup pot, steamer, multi-functional pot, cooking machine, bread maker, or electric griddle.

[0017] This invention also proposes a method for preparing a cooking appliance or heating device, comprising:

[0018] Paint A is sprayed onto the surface of the cookware substrate and allowed to dry at 100-120℃ for 5-10 minutes to form the first layer on the surface of the cookware substrate.

[0019] Print the ink on the side of the first layer away from the cookware substrate, and surface dry at 100-120℃ for 1-2 minutes to form a decorative layer;

[0020] Curing temperature is 260-280℃ for 10-15 minutes.

[0021] In one embodiment, after the step of forming the decorative layer, the method further includes the following steps: spraying paint B onto the side of the first layer facing away from the cookware substrate and covering it with the decorative layer, and surface drying at 100-120°C for 5-10 minutes to form a second layer; and / or,

[0022] The printing ink method includes pad printing or screen printing; and / or,

[0023] Before the step of spraying coating A onto the surface of the cookware substrate, the method further includes: preheating the cookware substrate to 40-50°C; and / or,

[0024] Before the step of spraying coating A onto the surface of the cookware substrate, the method further includes: sandblasting the surface of the cookware substrate to form a rough surface on the surface of the cookware substrate; wherein the roughness of the rough surface is 2.5-3.5μm.

[0025] The ceramic coating of this invention utilizes modified silanes containing polar functional groups, forming numerous polar groups on the ceramic coating. This provides abundant reaction sites for ink or topcoat adhesion, significantly enhancing adhesion and facilitating the bonding between the coating and ink or topcoat. It also improves the surface energy and corrosion resistance of the ceramic coating, allowing for pad printing or screen printing techniques to create a clear decorative layer display. Furthermore, it reduces the contact angle of the coating surface, promoting ink and topcoat spread and further enhancing adhesion. Additionally, printing patterns eliminates the need for coating sanding, preventing damage to both the coating and substrate, protecting both, extending product lifespan, simplifying the production process, and reducing production costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the cookware of the present invention.

[0028] Explanation of icon numbers:

[0029] label name label name 100 Cookware base material 220 Second floor 200 Ceramic coating 300 Decorative layer 210 First layer

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] The terms “comprising,” “including,” “containing,” “containing,” “having,” or other variations thereof are intended to cover non-closed inclusion, and no distinction is made between these terms. The term “comprising” means that other steps and components may be added without affecting the final result. The term “comprising” also includes the terms “consistently composed of” and “substantially composed of”. The compositions and methods / processes of the present invention comprise, consist of, and substantially consist of the essential elements and limitations described herein, as well as any additional or optional components, parts, steps, or limitations described herein. All numerical values ​​or expressions relating to component amounts, process conditions, etc., used in the specification and claims are to be understood in all cases to be modified by “about.” All ranges relating to the same component or property include endpoints that can be combined independently. Because these ranges are continuous, they include every value between a minimum and a maximum value. It should also be understood that any numerical range referenced in this application is intended to include all subranges within that range. As used herein, “parts by weight,” “number of parts by weight,” “mass parts,” or “number of parts by mass” are used interchangeably. A part by weight can be any fixed weight expressed in milligrams, grams, or kilograms (e.g., 1 mg, 1 g, 2 g, 5 g, or 1 kg). For example, a composition consisting of 1 part by weight of component a and 9 parts by weight of component b can be a composition consisting of 1 gram of component a + 9 grams of component b, or 10 grams of component a + 90 grams of component b, etc.

[0034] In related technologies, due to the low surface energy of ceramic coatings, patterns cannot be bonded to the ceramic coating, requiring the ceramic coating to be polished. However, this process is cumbersome, complex, and costly. While embossing or laser engraving can form patterns on the ceramic coating, there are problems such as unclear patterns or damage to the ceramic coating.

[0035] This invention proposes a ceramic coating.

[0036] In this embodiment of the invention, the ceramic coating includes coating A, which, based on a total weight of 100 parts, comprises 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, and 1-10 parts of first cosolvent; wherein the modified silane contains polar functional groups.

[0037] The ceramic coating of this invention uses modified silane containing polar functional groups, forming numerous polar groups on the ceramic coating 200. This provides abundant reaction sites for the adhesion of inks or topcoats, significantly enhancing adhesion and facilitating the bonding between the coating and the ink or topcoat. It also improves the surface energy and corrosion resistance of the ceramic coating 200, allowing for pad printing or screen printing of the decorative layer 300 onto the ceramic coating 200 to achieve a clear display effect. Furthermore, it reduces the contact angle of the coating surface, which is beneficial for the spread of inks and topcoats, further enhancing coating adhesion. Additionally, printing the decorative layer 300 does not require sanding the coating, avoiding damage to both the coating and the substrate, protecting both, extending product lifespan, simplifying the production process, and reducing production costs.

[0038] Specifically, please refer to Figure 1 The coating A can be a primer that can be sprayed onto the surface of the cookware substrate 100 to form a first layer 210 on the surface of the cookware substrate 100. It is understood that 100 parts by weight of coating A means that it can be made up with deionized water, and the total weight of all components of coating A is equal to 100 parts.

[0039] Specifically, silica sol is a dispersion of silica particles in water or a solvent. The SiO2 in silica sol contains a large number of hydroxyl groups. Silica sol exhibits good dispersibility and permeability, belonging to the category of colloidal solutions. The colloidal particles can firmly adhere to the surface of an object, forming silicon-oxygen bonds between them, resulting in good adhesion. Therefore, silica sol is the main film-forming substance of coating A, enabling coating A to form firmly on the surface of the cookware substrate 100.

[0040] Specifically, modified silane is used as an auxiliary film-forming substance. Since modified silane contains polar functional groups, many polar groups are distributed on the surface of the first layer 210, which has a better bonding force with the decorative layer 300 or the top layer, thereby improving the surface polarity and surface energy of the first layer 210. In addition, it allows the topcoat on the surface of the first layer 210 to be spread better, and it is not necessary to spray the topcoat when the first layer 210 is not dry, that is, it is not necessary to use the wet-on-wet technique, which simplifies the production process.

[0041] Understandably, functional groups play a decisive role in the properties of compounds, and these polar functional groups can be one or more of the following: mercapto, isocyanate group, urea group, glycidyl etheroxy group, epoxy group, chlorine, (meth)acryloyloxy group, and vinyl group.

[0042] Modified silanes are hydrolyzed to generate silanol groups (Si-OH). The silanol groups of the modified silane undergo cross-linking, and the silanol groups of the modified silane also cross-link with the silica sol. After heating, they undergo dehydration and condensation to form a three-dimensional cross-linked structure, namely the first layer 210. This makes the first layer 210 structure compact and not easy to crack.

[0043] Specifically, the acidic pH adjuster provides acidic conditions, allowing the modified silica gel to undergo a condensation reaction with the silica sol after hydrolysis under acidic conditions, thereby generating a ceramic coating. In one embodiment, the acidic pH adjuster includes one or more organic and inorganic acids, with a pH value ranging from 2 to 5. Preferably, the acidic pH adjuster is formic acid, which is a catalyst for the sol-gel reaction of the ceramic coating.

[0044] Specifically, dispersants can improve and enhance the dispersibility of material components, have anti-flocculation effects, reduce the dispersion time of material components, and stabilize material components to prevent them from depositing or agglomerating. There are various types of dispersants; in one embodiment, the dispersant includes one or more of BYK180, BYK190, BYK2010, and BYK2001.

[0045] Specifically, the first co-solvent serves two purposes: firstly, it improves the solubility of the modified silane and promotes the silane reaction; secondly, it enhances the leveling and wetting properties of coating A, facilitating its spread on the cookware surface and making it easier to spray. This first co-solvent can be of various types; in one embodiment, it includes one or more of isopropanol, propylene glycol methyl ether, and diethylene glycol butyl ether.

[0046] Specifically, deionized water is pure water after removing impurities in ionic form, or pure water that has completely or incompletely removed ionic substances.

[0047] The polar functional group can be of various types. In one embodiment, the modified silane includes silanes containing chlorine, epoxy, mercapto, double bond, or isocyanate functional groups. The silane may include a silane coupling agent with the general formula R. n SiX (4-n) In this silane coupling agent, R represents an organic functional group, such as vinyl, ethoxy, amino, epoxy, methacryloxy, or sulfhydryl; X represents a hydrolyzable alkoxy group, such as halogen, alkoxy, acyloxy, or methoxy; and n is an integer from 1 to 3, depending on the type and number of organic functional groups. This silane coupling agent can chemically bond with both organic and inorganic materials, increasing the adhesion between the two materials. X, being a hydrolyzable alkoxy group, can undergo coupling reactions with methoxy, ethoxy, and inorganic materials (glass, metal, SiO2); R, being an organic functional group, can undergo coupling reactions with inorganic materials, various synthetic resins, and rubber.

[0048] Further, in one embodiment, the modified silane includes mercaptopropyltrimethoxysilane, mercaptopropyltriethoxysilane, bis-(3-(triethoxysilane)-propyl)-tetrasulfide, bis-[3-(triethoxysilane)-propyl]-disulfide, propyltriethoxysilane 3-isocyanate, propyltrimethoxysilane 3-isocyanate, propylmethyldimethoxysilane 3-isocyanate, methyldimethoxysilane 1,3,5-tris(trimethoxysilane)-propyltrimethoxysilane, etc. γ-glycidyl propyl isocyanurate, γ-glycidyl etheroxypropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane, β-(3,4-epoxycyclohexyl)-ethyltriethoxysilane, β-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane, 3-(2,3-epoxypropoxy)propylmethyldiethoxysilane, chloropropyltrimethoxysilane The silane is one or more of the following: chloropropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriisopropoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ-methacryloxypropyltri(trimethylsiloxane)silane, 3-methacryloxypropyltriethoxysilane, 3-(methacryloxy)propylmethyldiethoxysilane, 3-acetoxypropyltrimethoxysilane, 3-(acryloxy)propyltrimethoxysilane, 3-(acryloxy)methyldimethoxysilane, vinyltriethoxysilane, vinyltri(2-methoxyethoxy)silane, vinyltriisopropoxysilane, methylvinyldimethoxysilane, and vinyltriacetoxysilane.

[0049] Trimethoxysilylpropanethiol is a water-white to yellowish-brown transparent liquid containing a mercaptopropyl polar functional group, which can increase the polarity of coating A and improve the coating's adhesion. Mercaptopropyl triethoxysilane is a pale yellow to yellow transparent liquid containing a mercaptopropyl polar functional group, which can also improve the adhesion of coatings.

[0050] Glycidyloxypropyltrimethoxysilane contains glycidyl polar groups, which can improve the adhesion of the coating and facilitate bonding with decorative layer 300 or top layer. It can also improve the flowability of coating A, making coating A easier to apply. Glycidyloxypropyltriethoxysilane also contains glycidyl polar groups, giving coating A strong bonding force, and the coating formed by coating A can easily bond with decorative layer 300 or top layer.

[0051] The molecular formula of chloropropyltrimethoxysilane is C6H. 15ClO3Si, a colorless or pale yellow transparent liquid, contains chloropropyl polar functional groups, which can improve the adhesion and mechanical properties of coating A, and increase the adhesion and hardness of the coating. Chloropropyltriethoxysilane, with the molecular formula C9H21O3SiCl, is also a colorless or pale yellow transparent liquid containing chloropropyl polar functional groups, which can improve the bonding strength of coating A. The first layer of coating A (210) exhibits good physical properties, abrasion resistance, and aging resistance.

[0052] It is understood that the coating A can be a colored paint, and the first layer 210 formed by the coating A can be a base coat. In one embodiment, the coating A further includes pigments and fillers. Based on 100 parts by weight of the total coating A, the coating A includes 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, 1-10 parts of first co-solvent, 35-45 parts of pigments and fillers, and the remainder is deionized water.

[0053] The pigments and fillers serve to color and fill, improving the coating's corrosion resistance, abrasion resistance, and toughness, acting as secondary film-forming substances. They can be uniformly dispersed in the film-forming substance and its solution, allowing coating A to form a colored paint. These pigments and fillers can include pigments and fillers. Pigments are used to impart different colors to the coating and can include common inorganic pigments. Inorganic pigments have good temperature resistance and safety, making them suitable for food contact coatings. Examples include titanium dioxide, manganese iron black, iron oxide yellow, iron oxide red, and cobalt blue. Fillers increase the solid content of the coating, reducing its cost. These pigments can include commonly used fillers such as mica powder, silica powder, kaolin, alumina powder, and fumed silica.

[0054] In one embodiment, the ceramic coating may further include coating B, which, based on a total weight of 100 parts, includes 18-27 parts of silica sol, 20-30 parts of methyltrimethoxysilane, 1-5 parts of non-sticking agent, and 0.1-0.5 parts of acidic pH adjuster.

[0055] Please see Figure 1 The coating B can be a topcoat, which can be sprayed onto the surface of the first layer 210 to form the second layer 220. Similarly, 100 parts by weight of coating B means that it can be made up with deionized water, and the total weight of all components of coating B is equal to 100 parts.

[0056] Methyltrimethoxysilane can improve the mechanical strength of coatings and serves as an auxiliary film-forming substance. Its rapid hydrolysis and polymerization rate shortens the reaction time of coatings and improves the curing efficiency of ceramic coatings. Furthermore, the Si group in methyltrimethoxysilane is linked to three -OCH3 groups, which, upon hydrolysis, form three silanol groups (Si-OH). These silanol groups, after polymerization with silica sol, form a coating with a three-dimensional cross-linked structure (i.e., the second layer 220), resulting in a dense structure that is less prone to cracking.

[0057] The non-stick additive can improve the feel and non-stick properties of the coating. In one embodiment, the non-stick additive includes polydimethylsiloxane.

[0058] It is understood that the coating B can be a topcoat, and the second layer 220 formed by the coating B can be a topcoat. Considering that the decorative layer 300 can be set on the surface of the first layer 210 or the surface of the cookware substrate 100, in order to facilitate the observation or display of the decorative layer 300, the second layer 220 formed by the coating B can be transparent or light-colored, as long as the decorative layer 300 is visible to the naked eye.

[0059] In one embodiment, the coating B further includes a decorative agent, a wetting and leveling agent, and a second co-solvent. Based on 100 parts by weight of the total coating B, the coating B includes 18-27 parts of silica sol, 20-30 parts of methyltrimethoxysilane, 0.5-1.5 parts of wetting and leveling agent, 1-5 parts of non-sticking agent, 1-10 parts of second co-solvent, 0.1-0.5 parts of acidic pH adjuster, and 0.05-0.5 parts of decorative agent.

[0060] This decorative agent is used to enhance the decorative effect and increase the gloss, thereby improving the gloss of the ceramic coating 200 surface and enhancing the overall texture of the ceramic coating 200. In one embodiment, the decorative agent includes pearlescent powder, which not only enhances the decorative effect and increases the gloss, but also makes the ceramic coating 200 harder and improves its wear resistance, enabling the ceramic coating 200 to have high durability in harsh and high-wear environments.

[0061] This wetting and leveling agent makes it easier for coating B to spread on the first layer 210, improving the wetting and leveling properties of coating B, and facilitating the adhesion and bonding of coating B to the surface of the first layer 210. There are various types of wetting and leveling agents; in one embodiment, the wetting and leveling agent includes one or more of BYK333, BYK348, BYK310, and BYK356.

[0062] The second co-solvent is used to improve the solubility of methyltrimethoxysilane and promote the silane reaction; it also helps to improve the leveling and wetting properties of coating B, facilitates the spread of coating B on the cookware surface, and makes coating B easier to spray. There are various types of the second co-solvent; in one embodiment, the second co-solvent includes one or more of isopropanol, propylene glycol methyl ether, and diethylene glycol butyl ether.

[0063] The present invention also proposes a cookware comprising a cookware substrate 100 and a ceramic coating 200. The ceramic coating 200 employs the aforementioned ceramic paint, and a first layer 210 is formed on the surface of the cookware substrate 100 by paint A. The side of the first layer 210 facing away from the cookware substrate 100 has a plurality of polar functional groups. For the specific materials and amounts of the ceramic paint, please refer to the above embodiments. Since this cookware adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0064] The cookware substrate 100 can be a metal substrate, such as stainless steel, aluminum, aluminum alloy, or titanium alloy; or it can be a metal composite substrate, including multi-layer metal composite substrates composed of metal, ceramic, or glass, such as stainless steel-aluminum, stainless steel-copper, or stainless steel-aluminum-copper multi-layer metal composite substrates. The cookware can include inner pots, inner pots, saucepans, frying pans, woks, and other cookware.

[0065] A ceramic coating 200 may be applied to at least one side of the cookware substrate 100 to improve the hardness and wear resistance of the cookware. The ceramic coating 200 includes a first layer 210, which is formed on the surface of the cookware substrate 100 by a coating A. The coating A may be applied to the surface of the cookware substrate 100 by spraying or printing, thereby forming the first layer 210 of the ceramic coating 200.

[0066] The first layer 210 has multiple polar functional groups on the side facing away from the cookware substrate 100, providing abundant reaction sites for the adhesion of inks or topcoats and increasing the surface energy of the ceramic coating 200. Furthermore, the polar functional groups of the first layer 210 can reduce the surface contact angle, which is beneficial for the spread of inks and topcoats, further enhancing the adhesion of the coating. Alternatively, the side of the first layer 210 facing the cookware substrate 100 can also have multiple polar functional groups, making it easier for the first layer 210 to bond with the cookware substrate 100 and preventing the ceramic coating 200 from easily peeling off. In one embodiment, the polar functional groups include one or more of the following: mercapto, isocyanate, urea, glycidyl ether, epoxy, chlorine, (meth)acryloyloxy, and vinyl.

[0067] The contact angle is the angle between the solid-liquid interface and the gas-liquid interface at the solid-liquid-gas three-phase interface when a liquid comes into contact with a solid surface. When wettability is good, the liquid can spread completely on the solid surface, exhibiting a 0° contact angle; when wettability is poor, the liquid cannot spread at all on the solid surface and can only clump together, exhibiting a 180° contact angle. In one embodiment, the contact angle of the first layer 210 is less than 75°, thereby facilitating the adhesion of inks and topcoats, as well as the spreading of coating B.

[0068] This cookware can be equipped with a decorative layer 300, please refer to [link / reference]. Figure 1 In one embodiment, the cookware further includes a decorative layer 300, which is disposed on the side of the first layer 210 opposite to the cookware substrate 100.

[0069] In one embodiment, the decorative layer 300 includes one or more combinations of patterns, text, characters, symbols, lines, shapes, water level lines, and scale lines. For example, lines, shapes, water level lines, and scale lines can indicate the amount of liquid added or the total solid-liquid volume; patterns, text, characters, and symbols can also enhance the aesthetics of the cookware. The color of the decorative layer 300 can be varied, such as changing color with temperature or displaying different colors upon contact with water, to serve as a reminder. Since the side of the first layer 210 facing away from the cookware substrate 100 has polar functional groups, the decorative layer 300 can adhere to this side, serving a reminder or aesthetic purpose. The decorative layer 300 can be applied using pad printing or screen printing, thus avoiding damage to the ceramic coating 200 and the cookware substrate 100, improving the performance of the inner pot.

[0070] Please see Figure 1 In one embodiment, the ceramic coating 200 further includes a second layer 220, the ceramic coating comprising coating B, which covers the decorative layer 300 and forms the second layer 220 on the side of the first layer 210 facing away from the cookware substrate. By covering the decorative layer 300 with the second layer 220, direct contact between the decorative layer 300 and food is avoided, and the corrosion resistance of the decorative layer 300 is improved, extending its service life.

[0071] In order to make the decorative layer 300 visible, in one embodiment, the second layer 220 is a light-transmitting layer that at least partially transmits light to make the decorative layer 300 visible, so that the second layer 220 formed by the coating B is transparent or light-colored and the decorative layer 300 can be seen with the naked eye.

[0072] The present invention also proposes a cooking utensil, which includes a cooker. The specific implementation of the cooking utensil can be referred to the above embodiments. Since the cooking utensil adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0073] The cooking appliance can be of various types. In one embodiment, the cooking appliance includes a rice cooker, pressure cooker, frying pan, wok, soup pot, steamer, multi-functional pot, cooking machine, bread maker, or electric griddle.

[0074] This invention also proposes a method for preparing a cookware, comprising the following steps:

[0075] S10. Apply coating A to the surface of cookware substrate 100 and allow it to dry at 100-120°C for 5-10 minutes to form a first layer 210 on the surface of cookware substrate 100.

[0076] S20. Print ink on the side of the first layer 210 away from the cookware substrate 100, and surface dry at 100-120°C for 1-2 minutes to form the decorative layer 300.

[0077] S40, cure at 260-280℃ for 10-15 minutes.

[0078] In step S10, paint A is sprayed onto a predetermined area on a surface of the cookware substrate 100. After surface drying at 100-120°C for 5-10 minutes, paint A forms the first layer 210 of the ceramic coating 200 on the surface of the cookware substrate 100. This surface drying treatment of paint A prevents subsequent printing inks from mixing with paint A, thus improving ink clarity.

[0079] Then, ink is printed on the first layer 210 and surface-dried at 100-120℃ for 1-2 minutes to form the decorative layer 300, preventing the ink from mixing with the coatings in subsequent processes. Since the surface-dried first layer 210 is not sticky to the touch when lightly touched, it needs to be cured. High curing temperature or long curing time will affect the adhesion of the first layer 210, making it prone to peeling; low curing temperature or short curing time will result in a wet film state, making the ceramic coating 200 easily damaged. The first layer 210 of the ceramic coating 200 is cured at 260-280℃ for 10-15 minutes to obtain the ceramic coating 200 on the cookware substrate 100.

[0080] In one embodiment, after the step of forming the decorative layer 300, the following step is further included:

[0081] S30. Apply paint B to the side of the first layer 210 away from the cookware substrate 100 and cover it with decorative layer 300. Surface dry at 100-120°C for 5-10 minutes to form the second layer 220.

[0082] In step S30, coating B is sprayed onto the first layer 210, covering the decorative layer 300. After surface drying at 100-120°C for 5-10 minutes, a second layer 220 of ceramic coating 200 is formed on the side of the first layer 210 facing away from the cookware substrate 100. This second layer 220 can be a topcoat, which may have non-stick properties. Step S30 can be performed after step S20 and before the curing step, so that the second layer 220 can be cured together with the first layer 210.

[0083] In one embodiment, in the step of printing the decorative layer 300 on the side of the first layer 210 facing away from the cookware substrate 100, the ink is printed by pad printing or screen printing. That is, the ink is applied to the surface-dried first layer 210 by pad printing or screen printing, and because the first layer 210 has polar groups, the ink can adhere to the first layer 210.

[0084] In one embodiment, the steps include the following before spraying paint A:

[0085] S51. Preparation of color paste: Mix silica sol, dispersant and deionized water evenly, and grind to a fineness of less than 20μm to obtain a mixture;

[0086] S52. Preparation of primer: Mix the modified silane, the first cosolvent, and the acidic pH adjuster evenly, add the mixture, and roll at 120-150 rpm for 3-4 hours to obtain coating A.

[0087] In step S51, zirconium beads can be used for grinding to achieve a fineness of less than 20 μm in the mixture, preventing agglomeration that could affect the uniformity of the ceramic coating 200 color and preventing excessively large particles from clogging the spray gun. For example, coating A includes pigments and fillers, which can be uniformly mixed with silica sol, dispersant, and deionized water. In step S52, the modified silane, the first co-solvent, the acidic pH adjuster, and the mixture can react in a roller holder.

[0088] In one embodiment, the step further includes the following step before spraying paint A:

[0089] S53. Mix silica sol, methyltrimethoxysilane, wetting and leveling agent, non-sticking agent, second co-solvent and acidic pH adjuster, and roll at 120-150 rpm for 3-4 hours to obtain coating B.

[0090] In step S53, if coating B includes a decorative agent, this decorative agent can be uniformly mixed with silica sol, methyltrimethoxysilane, wetting and leveling agent, non-sticking agent, second co-solvent, and acidic pH adjuster. Similarly, step S53 can also be performed in a roller stand.

[0091] In one embodiment, before spraying coating A onto the surface of the cookware substrate 100, the following steps are included:

[0092] S61. Sandblast the surface of the cookware substrate 100 to form a rough surface on the surface of the cookware substrate 100; wherein the roughness of the rough surface is 2.5-3.5μm.

[0093] In step S61, sandblasting can be performed using materials such as corundum, red corundum, or white corundum. By increasing the surface roughness of the cookware substrate 100 to 2.5-3.5 μm, the contact area between the coating A and the cookware substrate 100 is increased, improving the adhesion between them. Furthermore, sandblasting the surface of the cookware substrate 100 can disperse the stress in the first layer 210 of the ceramic coating 200, making it less prone to chipping during the drying and curing process, thus protecting the ceramic coating 200.

[0094] In one embodiment, before spraying coating A onto the surface of the cookware substrate 100, the following steps are included:

[0095] S62. Preheat the cookware substrate 100 to 40-50℃.

[0096] In step S62, preheating the cookware substrate 100 to 40-50°C facilitates the adhesion of coating A, resulting in a large cumulative thickness of coating A on the surface of the cookware substrate 100 and preventing coating A from dripping.

[0097] The embodiments of the present invention will be described in detail below with reference to specific examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0098] Example 1

[0099] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 27 parts of mercaptopropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 1 part of isopropanol, 25 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0100] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0101] Example 2

[0102] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 27 parts of γ-glycidyl ether oxypropyltrimethoxysilane, 0.2 parts of formic acid, 1 part of BYK180, 5 parts of isopropanol, 25 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0103] Based on a total weight of 100 parts for coating B, coating B comprises 25 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1.5 parts polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0104] Example 3

[0105] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 27 parts of chloropropyltrimethoxysilane, 0.2 parts of formic acid, 1 part of BYK180, 1 part of isopropanol, 25 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0106] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 5 parts isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0107] Example 4

[0108] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 27 parts of vinyltriethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 5 parts of isopropanol, 25 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0109] Based on a total weight of 100 parts for coating B, coating B comprises 25 parts silica sol, 25 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0110] Example 5

[0111] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 32 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 1 part of isopropanol, 20 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0112] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 2 parts polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0113] Example 6

[0114] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 37 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 7 parts of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0115] Based on a total weight of 100 parts for coating B, coating B comprises 20 parts silica sol, 25 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0116] Example 7

[0117] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 30 parts of silica sol, 32 parts of γ-methacryloyloxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 1 part of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0118] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0119] Example 8

[0120] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 30 parts of silica sol, 32 parts of γ-glycidyl ether oxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 5 parts of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0121] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 25 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1.5 parts polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0122] Example 9

[0123] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 37 parts of γ-glycidyl ether oxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 7 parts of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0124] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0125] Comparative Example 1

[0126] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 25 parts of silica sol, 27 parts of methyltrimethoxysilane, 0.5 parts of polydimethylsiloxane, 0.1 parts of formic acid, 0.5 parts of BYK180, 1 part of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0127] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0128] Comparative Example 2

[0129] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 15 parts of silica sol, 47 parts of γ-glycidyl ether oxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 1 part of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0130] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0131] Comparative Example 3

[0132] The ceramic coating includes coating A and coating B. Based on a total weight of 100 parts, coating A includes 47 parts of silica sol, 15 parts of γ-glycidyl ether oxypropyltrimethoxysilane, 0.1 parts of formic acid, 0.5 parts of BYK180, 1 part of isopropanol, 15 parts of mica powder, 10 parts of titanium yellow, and the remainder is deionized water.

[0133] Based on a total weight of 100 parts for coating B, coating B comprises 18 parts silica sol, 20 parts methyltrimethoxysilane, 0.5 parts BYK-333, 1 part K-766, 1 part isopropanol, 1 part polydimethylsiloxane, 0.1 parts formic acid, 0.05 parts pearlescent powder, and the remainder being deionized water.

[0134] Methods for preparing cooking utensils:

[0135] (1) Preparation of coating A

[0136] Preparation of color paste: Mix silica sol, pigments and fillers, wetting and leveling agents and deionized water evenly, grind to a fineness of 18μm to obtain a mixture;

[0137] Preparation of primer: Mix silane, cosolvent, the above color paste and acid pH adjuster evenly, add the mixture, and roll at 120 rpm for 3 hours to obtain coating A.

[0138] (2) Preparation of coating B

[0139] The silica sol, methyltrimethoxysilane, wetting and leveling agent, non-sticking agent, isopropanol and acidic pH adjuster are mixed and rolled at 120 rpm for 3 hours to obtain coating B.

[0140] (3) Preparation of ceramic coating:

[0141] Degrease and clean the surface of the cookware substrate 100;

[0142] The surface of the cookware substrate 100 is sandblasted with diamond to form a rough surface; wherein the roughness of the rough surface is 2.5μm.

[0143] Preheat the cookware substrate 100 to 40°C;

[0144] Paint A is sprayed onto the surface of cookware substrate 100 and surface dried at 100°C for 5 minutes to form a first layer 210 on the surface of cookware substrate 100.

[0145] Ink is printed on the side of the first layer 210 that is opposite to the cookware substrate 100, and surface dried at 100°C for 2 minutes to form a water level line;

[0146] Paint B is sprayed on the side of the first layer 210 away from the cookware substrate 100 and the water level line is covered. The surface is dried at 100°C for 5 minutes to form the second layer 220.

[0147] The substrate 100 containing a ceramic coating 200 is obtained by curing at 260°C for 10 minutes.

[0148] Table 1 Sample Component Parameters

[0149]

[0150]

[0151] Water contact angle test:

[0152] The water contact angle of primer 210 was tested using a contact angle tester, and the results are shown in Table 2.

[0153] Coating adhesion:

[0154] After the ceramic coating 200 has cured at 260℃, use a scribing tool to make 1mm cuts on the screen printing ink area. 2 For a grid of 100 squares, apply Japanese adhesive tape or 3M SCOTCHNO898 adhesive tape to the diagonal direction of the grid. Then, immediately pull the tape up at a 90° angle perpendicular to the ceramic coating 200 surface. Repeat the test 5 times and check the screen-printed area for any coating peeling. The results are shown in Table 2.

[0155] Judgment: Generally divided into six levels: 0, 1, 2, 3, 4, and 5. 0 indicates 100% paint film retention; 1 indicates relatively intact paint film with only a few damaged edges and corners; 2 indicates numerous damaged edges and corners but no complete peeling off; 3 indicates severe damage to edges and corners with a few complete peeling off; 4 indicates severe damage to edges and corners with many complete peeling off, but paint film retention area > 65%; 5 indicates paint film retention area < 65%. Note: All cuts should penetrate the coating, but not too deeply into the substrate.

[0156] Table 2 Performance Test Results:

[0157] 210 (primer) water contact angle / ° Coating adhesion / level Example 1 30 0 Example 2 45 0 Example 3 48 0 Example 4 50 0 Example 5 55 0 Example 6 60 0 Example 7 52 0 Example 8 42 0 Example 9 39 0 Comparative Example 1 98 5 Comparative Example 2 52 3 Comparative Example 3 56 3

[0158] As can be seen from the table above, comparing the embodiments and the comparative examples, in the embodiments, the water contact angle of the first layer 210 is 30-60°, while in the comparative example 1, the water contact angle of the first layer 210 is 98°. This indicates that the contact angle of embodiments 1-9 of this application is small, which allows for pad printing or screen printing of inks. The technical solution of this application forms a first layer 210 with a small contact angle, which can form a decorative layer 300 on the ceramic coating 200, solving the problem that the ceramic coating 200 has low surface tension and requires polishing before pad printing or screen printing of inks. At the same time, the first layer 210 can also be well bonded with the second layer 220, saving the intermediate coating process and reducing production costs.

[0159] According to the coating adhesion test results, the adhesion of the ceramic coating 200 in Examples 1-9 was rated at level 0, indicating that the ceramic coating 200 of this application embodiment was completely retained on the cookware substrate 100, and the technical solution of this application resulted in strong adhesion of the ceramic coating 200 on the cookware substrate 100. In contrast, the adhesion of the ceramic coating 200 in Comparative Examples 1-3 was rated at level 3 or 5. The ceramic coating 200 in the comparative examples showed damage and detachment during the adhesion test, indicating that the ceramic coating 200 could not adhere well to the cookware substrate 100 and easily fell off.

[0160] Unless otherwise specified, the raw materials and equipment used in this invention are commonly used in the field; the methods used in this invention are conventional methods in the field. Unless otherwise specified, the meanings of the terms in this specification are the same as those generally understood by those skilled in the art, but in case of conflict, the definitions in this specification shall prevail.

[0161] The foregoing examples are merely illustrative, used to explain some features of the method described in this invention. The appended claims are intended to claim the broadest possible scope, and the embodiments presented herein are merely illustrative of selected implementations based on combinations of all possible embodiments. Therefore, the applicant intends that the appended claims are not limited by the selection of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A ceramic coating, characterized by, The ceramic coating includes a coating A, the coating A includes, based on 100 parts by weight of the total coating A, 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, and 1-10 parts of first co-solvent; wherein the modified silane contains a polar functional group.

2. The ceramic coating of claim 1, wherein, The polar functional group includes one or more of thiol, isocyanate, urea, glycidyl ether, epoxy, chlorine, (methyl) acryloyl, and vinyl.

3. The ceramic coating of claim 2, wherein, The modified silane includes a silane containing a chlorine, epoxy, thiol, double bond, and isocyanate functional group.

4. The ceramic coating of claim 3, wherein, The acidic pH adjuster includes one or more of an organic acid and an inorganic acid, and the pH of the acidic pH adjuster ranges from 2 to 5; and / or, The dispersant includes one or more of BYK180, BYK190, BYK2010, and BYK2001; and / or, The first co-solvent includes one or more of isopropyl alcohol, propylene glycol methyl ether, and diethylene glycol butyl ether.

5. The ceramic coating of claim 3, wherein, The coating A further includes a pigment filler, the coating A includes, based on 100 parts by weight of the total coating A, 25-40 parts of silica sol, 27-42 parts of modified silane, 0.1-0.5 parts of acidic pH adjuster, 0.5-1.5 parts of dispersant, 1-10 parts of first co-solvent, 15-45 parts of pigment filler, and the rest is deionized water.

6. The ceramic coating according to any one of claims 1 to 5, wherein The ceramic coating includes a coating B, the coating B includes, based on 100 parts by weight of the total coating B, 18-27 parts of silica sol, 20-30 parts of methyltrimethoxysilane, 1-5 parts of auxiliary agent, and 0.1-0.5 parts of acidic pH adjuster.

7. The ceramic coating of claim 6, wherein, The coating B further includes a decorative agent, a wetting and leveling agent, and a second co-solvent, the coating B includes, based on 100 parts by weight of the total coating B, 18-27 parts of silica sol, 20-30 parts of methyltrimethoxysilane, 0.5-1.5 parts of wetting and leveling agent, 1-5 parts of non-stick auxiliary agent, 1-10 parts of second co-solvent, 0.1-0.5 parts of acidic pH adjuster, and 0.05-0.5 parts of decorative agent.

8. A cooking appliance characterized by, Comprise: a cookware base material; and a ceramic coating layer formed by applying the coating A on a surface of the cookware base material, the ceramic coating layer having a plurality of polar functional groups on a side of the ceramic coating layer facing away from the cookware base material. The cookware further comprises a decorative layer disposed on the side of the first layer facing away from the cookware base material; and / or, 9. The cooker according to claim 8, wherein a contact angle of a surface of the first layer is less than or equal to 75°. The ceramic coating layer further comprises a second layer, the ceramic coating includes a coating B, the coating B covers the decorative layer and forms the second layer on the side of the first layer facing away from the cookware base material; 10. The cooker according to claim 9, wherein and / or, the decorative layer includes one or more combinations of a pattern, a word, a character, a logo, a line, a shape, a water level line, and a scale line. The second layer is a light-transmitting layer, the light-transmitting layer is at least partially transparent to light, so that the decorative layer is visible.

11. The cooker according to claim 10, wherein Comprise the cookware according to any one of claims 8 to 11.

12. A cooking appliance characterized by, ​ 13. The cooking appliance of claim 12, wherein, The cooking utensil includes an electric rice cooker, a pressure cooker, a frying pan, a wok, a soup pot, a steamer, a multifunctional pot, a cooking machine, a bread maker or an electric baking pan.

14. A method of manufacturing a cookware as claimed in any one of claims 8 to 11, characterized in that, Comprising: spraying paint A on the surface of the utensil base material, and surface drying for 5-10 minutes at a temperature of 100-120 ℃ to form a first layer on the surface of the utensil base material; printing ink on the side of the first layer away from the utensil base material to form a decorative layer, and surface drying for 1-2 minutes at a temperature of 100-120 ℃; curing for 10-15 minutes at a temperature of 260-280 ℃.

15. The method of claim 14, wherein the cookware is prepared by After the step of forming the decorative layer, further comprising the following steps: spraying paint B on the side of the first layer away from the utensil base material to cover the decorative layer, and surface drying for 5-10 minutes at a temperature of 100-120 ℃ to form a second layer; and / or, the printing ink includes pad printing or screen printing; and / or, Before the step of spraying paint A on the surface of the utensil base material, further comprising the following steps: preheating the utensil base material to 40-50 ℃; and / or, Before the step of spraying paint A on the surface of the utensil base material, further comprising the following steps: sandblasting the surface of the utensil base material to form a rough surface on the surface of the utensil base material; wherein the roughness of the rough surface is 2.5-3.5 μm.

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