An inner pot and a cooking appliance

Abstract

An inner pot and a cooking appliance. The inner pot comprises a pot blank, a ceramic bottom layer and a top layer. The ceramic bottom layer is located on the inner surface of the pot blank. The top layer is located above the ceramic bottom layer, and the top layer comprises a cross-linked elastomer and a silicone oil, the silicone oil being at least partially swelled in the cross-linked network of the cross-linked elastomer. According to the inner pot of the present application, the top layer utilizes the cross-linked elastomer to accommodate the silicone oil with strong non-stick properties and slowly release, thereby obtaining a long-lasting and strong non-stick performance, and also having flexibility and being less prone to cracking.

Description

Technical Field

[0001] This application relates to the field of cooking appliance technology, and more specifically to an inner pot and a cooking appliance. Background Technology

[0002] Currently, some high-end cooking appliances have ceramic coatings on their inner pots. Conventional inorganic ceramic coatings form a dense oxide film on the surface after film formation, similar to the glaze on ceramic surfaces, offering advantages such as high wear resistance and being environmentally friendly and fluorine-free. This dense oxide film also provides some non-stick properties. However, its non-stick performance is insufficient compared to traditional non-stick coatings.

[0003] In addition, some ceramic coatings currently improve non-stick properties by adding low surface energy substances, but due to the high hardness of ceramic coatings, only a very small amount of low surface energy substances can be added, and the effect is generally not as good as traditional non-stick layers.

[0004] Therefore, an inner pot and cooking appliance are needed to at least partially solve the above problems. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially address the aforementioned problems, a first aspect of this application provides an inner pot for a cooking utensil, the inner pot comprising: Pot base; A ceramic substrate, wherein the ceramic substrate is located on the inner surface of the pot blank; A surface layer, located above the ceramic substrate, comprising a crosslinked elastomer and silicone oil, wherein the silicone oil is at least partially swollen in the crosslinked network of the crosslinked elastomer.

[0007] The inner pot of this application differs from traditional hard non-stick layers. This surface layer utilizes a cross-linked elastomer to contain and slowly release silicone oil with strong non-stick properties, thereby achieving long-lasting and effective non-stick performance, while also being flexible and not prone to cracking.

[0008] Optionally, the crosslinked elastomer is vinyl silicone rubber.

[0009] Optionally, in the surface layer, the mass fraction of the crosslinked elastomer is 70.6% to 82.2%.

[0010] Optionally, in the surface layer, the mass fraction of the silicone oil is 13.5% to 21.5%.

[0011] Optionally, the ceramic substrate includes an organosilicon-silica hybrid, and the crosslinked elastomer portion of the surface layer is incorporated into the organosilicon-silica hybrid. According to this design, the surface layer and substrate can be substantially integrated, resulting in a stronger bond between the surface layer and the substrate.

[0012] Optionally, the surface layer includes a non-stick surface layer attached to the ceramic substrate. This non-stick surface layer is formed by a non-stick coating film, the formulation of which includes a polysiloxane raw rubber and a crosslinking agent. The polysiloxane raw rubber and the crosslinking agent can undergo a crosslinking reaction to generate the crosslinked elastomer. According to this solution, on the one hand, the double-layer structure has a small thickness and low cost; on the other hand, the elastomer formed by the reaction of the polysiloxane raw rubber and the crosslinking agent itself has low surface energy and a certain degree of hydrophobicity, further improving the non-stick performance.

[0013] Optionally, the non-stick surface layer is attached to the ceramic substrate, and the top layer is formed by coating the ceramic substrate with a non-stick coating to form a top coating, wherein the total thickness of the ceramic substrate and the top layer is 25~38μm.

[0014] Optionally, the surface layer further includes a ceramic transition layer located between the ceramic substrate and the non-stick surface layer. The ceramic transition layer is connected to the ceramic substrate, and the non-stick surface layer is connected to the ceramic transition layer. According to this solution, by providing a transition layer, the adhesion of the non-stick surface layer is improved, and this design also improves the overall mechanical properties of the coating.

[0015] Optionally, the topcoat is formed by first applying a ceramic coating to the ceramic substrate to form an intermediate coating, and then applying a non-stick coating to the intermediate coating while it is wet to form a topcoat. The intermediate coating and the topcoat are then sintered and cured. According to this solution, the wet spraying process allows the intermediate coating and topcoat to be combined to form the topcoat, enabling a strong transition bond between the topcoat and the ceramic substrate. This results in balanced overall mechanical properties and good durability of the coating.

[0016] Optionally, the total thickness of the ceramic substrate and the surface layer is 28~42μm.

[0017] Optionally, the polysiloxane raw rubber comprises polymethylvinylsiloxane, and the crosslinking agent comprises polymethylhydrosiloxane.

[0018] Optionally, the formulation of the non-stick coating is as follows: Polysiloxane raw rubber, with a mass ratio of 11% to 14%; Crosslinking agent, with a mass ratio of 13% to 16%; Catalyst, with a mass ratio of 0.5% to 1%; Silicone oil, with a mass ratio of 5% to 7%; Ethyl silicate, with a mass ratio of 20% to 24%; Butyl acetate, with a mass ratio of 38% to 43%; Butanone, with a mass ratio of 5% to 7%; Leveling agent, with a mass ratio of 1% to 2%.

[0019] A second aspect of this application provides a cooking appliance, the cooking appliance comprising: A pot body, wherein the inner pot described in the first aspect is provided in the pot body; A lid is provided on the pot body in an openable and closable manner. When the lid is closed on the pot body, a cooking space for stewing is formed between the lid and the pot body.

[0020] The cooking appliance according to this application has similar technical effects to the inner pot of the first aspect described above. Attached Figure Description

[0021] The following figures are included as part of this application for understanding the application. The figures illustrate embodiments of the application and their descriptions, serving to explain the principles of the application. In the figures: Figure 1 This is a schematic diagram of the inner pot surface coating structure according to one embodiment of this application; Figure 2 This is a schematic diagram of the inner pot surface coating structure according to another embodiment of this application. Detailed Implementation

[0022] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0024] The ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term “first component” does not imply the existence of a “second component,” and the term “second component” does not imply the existence of a “first component.” It should be noted that the terms “upper,” “lower,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0025] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings.

[0026] This application provides a cooking utensil comprising a lid and a pot body. The lid has a shape substantially corresponding to the pot body. The lid is closable and can be opened and closed on the pot body. The lid can be pivotally connected to the pot body, for example, via a pivot axis, and can freely pivot between a closed position and an open position relative to the pot body about the pivot axis, to facilitate closing and opening the pot body. The pot body includes an inner pot and has a cylindrical storage section. The inner pot can be freely placed into or removed from the storage section for easy cleaning. The inner pot is typically made of metal and has a circular opening on its upper surface for holding materials to be heated, such as rice or soup. The pot body also has a middle plate with an opening corresponding to the storage section to allow the inner pot to be inserted and removed.

[0027] This application also provides an inner pot, namely the inner pot provided in the pot body as described above. The inner pot has a pot blank, which is preferably a metal pot blank, which is generally made of raw materials such as aluminum sheet, iron sheet, steel sheet, iron-aluminum composite sheet, steel-aluminum composite sheet or steel-aluminum-steel composite sheet through processes such as stamping or expansion.

[0028] The inner pot also includes a ceramic bottom layer and a top layer. The ceramic bottom layer is located on the inner surface of the pot blank. The top layer is located on the ceramic bottom layer and contains cross-linked elastomer and silicone oil, with the silicone oil at least partially swollen in the cross-linked network of the cross-linked elastomer. The ceramic bottom layer can be a single-layer structure or a multi-layer structure. The top layer can also be a single-layer structure or a multi-layer structure.

[0029] According to the inner pot of this application, unlike the hard non-stick layer of traditional ceramic coatings, this surface layer utilizes a cross-linked elastomer to contain and slowly release silicone oil with strong non-stick properties, thereby achieving long-lasting and effective non-stick performance. Specifically, some silicone oil is contained in the sponge-like pores of the three-dimensional cross-linked network, existing in a capsule-like form, while some silicone oil migrates to the surface of the surface layer, thus playing a non-stick role during cooking. Furthermore, the silicone oil in the three-dimensional cross-linked network slowly migrates to the surface over time and use, replenishing the silicone oil consumed on the surface. Therefore, by using a three-dimensional cross-linked network of silicone rubber to store silicone oil, a larger amount of silicone oil can be stored, and the release of silicone oil is more gradual, keeping the silicone oil on the surface layer in an optimal state. Moreover, the surface layer of this application, mainly using an elastomer, is flexible, overcoming the cracking defects of hard non-stick layers.

[0030] The crosslinked elastomer is vinyl silicone rubber. In the surface layer after film formation, the mass fraction of the crosslinked elastomer is 70.6%~82.2%, and the mass fraction of the silicone oil is 13.5%~21.5%. This ratio not only utilizes the low surface energy property of silicone oil to enhance non-stick properties, but also ensures that most of the silicone oil is distributed within the crosslinked elastomer network, preventing excessive migration due to excess silicone oil. Instead, it slowly migrates to the surface as the silicone oil is consumed.

[0031] More specifically, the ceramic underlayer is formed by applying a ceramic coating to the inner surface of the pot blank to form a base coat, which is then dried. The ceramic underlayer contains an organosilicon-silica hybrid. It is easy to understand that the organosilicon-silica hybrid is the ceramic-like component found in traditional ceramic coatings. As an example, the ceramic coating formulation also contains polymethylsiloxane and silica sol, which react to generate the aforementioned organosilicon-silica hybrid.

[0032] As one implementation, refer to Figure 1 The surface layer includes a non-stick top layer attached to a ceramic substrate. The surface layer is formed by applying a non-stick coating to the ceramic substrate to form a topcoat, followed by sintering and curing. The non-stick coating formulation includes a polysiloxane raw rubber and a crosslinking agent, which can undergo a crosslinking reaction to generate the aforementioned crosslinked elastomer. According to this solution, on the one hand, the double-layer structure has a small thickness and low cost; on the other hand, the elastomer formed by the reaction of the polysiloxane raw rubber and the crosslinking agent itself has a low surface energy and a certain degree of hydrophobicity, further improving the non-stick performance. In this embodiment, the total thickness of the ceramic substrate and the surface layer is 25~38μm.

[0033] As another alternative implementation, refer to Figure 2The surface layer comprises a ceramic transition layer and a non-stick surface layer, with the non-stick surface layer connected to the ceramic transition layer, and the interface between the non-stick surface layer and the ceramic transition layer is fused. Specifically, the surface layer is formed by first applying a ceramic coating to a ceramic substrate to form an intermediate coating, then applying a non-stick coating to the intermediate coating while it is wet to form a topcoat. The intermediate coating and topcoat are then sintered and cured. During this process, the interface between the wet intermediate coating and the wet non-stick coating partially fuses, forming a ceramic transition layer at this fusion point after sintering. The non-stick coating formulation includes a polysiloxane raw rubber and a crosslinking agent, which can undergo a crosslinking reaction to generate the aforementioned crosslinked elastomer. In this embodiment, a wet spraying process is used to form the surface layer together with the intermediate coating and the topcoat, allowing the surface layer to form a strong transition bond with the ceramic substrate through the intermediate coating. This results in balanced overall mechanical properties of the coating, good durability, and a certain degree of reinforcement of the non-stick surface layer. In other words, in this embodiment, the crosslinked elastomer portion of the surface layer is incorporated into the organosilicon-silica hybrid. In this embodiment, due to the two wet spraying layers, the total thickness of the ceramic base layer and the top layer is 28~42μm.

[0034] The raw polysiloxane rubber includes polymethylvinylsiloxane, and the crosslinking agent includes polymethylhydrosiloxane. The crosslinked elastomer formed by these two components is not only highly hydrophobic, but also, as a crosslinked silicone elastomer, it has good wear resistance and weather resistance, thus improving the durability of the surface layer.

[0035] The formulation of the non-stick coating is as follows: polysiloxane raw rubber, 11%~14% by mass; crosslinking agent, 13%~16% by mass; catalyst, 0.5%~1% by mass; silicone oil, 5%~7% by mass; ethyl silicate, 20%~24% by mass; butyl acetate, 38%~43% by mass; methyl ethyl ketone (MEK), 5%~7% by mass; and leveling agent, 1%~2% by mass. The silicone oil can be methyl silicone oil. The catalyst can be a platinum-based catalyst, etc.

[0036] After thoroughly mixing all components of the non-stick coating, the topcoat can be sprayed on. After spraying, the entire inner pot is transferred to a sintering furnace for curing. At a temperature of 270-290°C in the sintering furnace, polymethylvinylsiloxane and polymethylhydrosiloxane crosslink under the action of a catalyst to form vinyl silicone rubber. Simultaneously, the raw materials in the ceramic substrate fully react and cure, forming a robust Si-O-Si network.

[0037] In particular, the non-stick coating formulation of this application contains methyl ethyl ketone (MEK) solvent. This solvent has strong dissolving power and moderate evaporation rate, and also has good leveling properties. This allows the non-stick coating to form a relatively uniform and smooth wet film after spraying to form a topcoat, resulting in uniform material distribution in all areas. This makes it less likely for the durability to deteriorate or for the color to fade during use due to insufficient material on the surface.

[0038] It should be noted that for the above-mentioned non-stick coating formulation, the solvents evaporate after film formation, namely ethyl silicate, butyl acetate and methyl ethyl ketone, and most of the substances retained in the dry film are cross-linked elastomers and silicone oils.

[0039] When the non-stick coating formulation contains 14% polysiloxane raw rubber, 16% crosslinking agent, 0.5% catalyst, 5% silicone oil, 20% ethyl silicate, 38.5% butyl acetate, 5% methyl ethyl ketone (MEK), and 1% leveling agent, the crosslinked elastomer content in the non-stick surface dry film is 82.2%.

[0040] When the non-stick coating formulation contains 11% polysiloxane raw rubber, 13% crosslinking agent, 1% catalyst, 7% silicone oil, 21% ethyl silicate, 40% butyl acetate, 5% methyl ethyl ketone (MEK), and 2% leveling agent, the crosslinked elastomer content in the non-stick surface dry film is 70.6%.

[0041] When the non-stick coating formulation contains 11% polysiloxane raw rubber, 13% crosslinking agent, 0.5% catalyst, 7% silicone oil, 21% ethyl silicate, 41% butyl acetate, 5.5% methyl ethyl ketone (MEK), and 1% leveling agent, the silicone oil content in the non-stick surface dry film is 21.5%.

[0042] When the non-stick coating formulation contains 14% polysiloxane raw rubber, 16% crosslinking agent, 1% catalyst, 5% silicone oil, 20% ethyl silicate, 38% butyl acetate, 5% methyl ethyl ketone (MEK), and 1% leveling agent, the silicone oil content in the non-stick surface dry film is 13.5%.

[0043] The ceramic coating is described in detail below. As a preferred embodiment, the ceramic coating formulation includes thermoplastic engineering plastics. By adding high-strength yet resilient thermoplastic engineering plastics to the ceramic substrate, a certain degree of toughness is achieved without affecting the overall strength of the ceramic substrate, thereby improving its impact resistance and crack resistance.

[0044] Specifically, the thermoplastic engineering plastic content in the ceramic substrate is 0.8% to 1.74% by mass. The thermoplastic engineering plastic is selected from polyethersulfone and / or polyetheretherketone. Preferably, polyetheretherketone is selected. This provides a certain degree of toughness without affecting the overall strength of the ceramic substrate, thus improving its impact resistance and crack resistance.

[0045] The titanium content in the ceramic base layer ranges from 1.6% to 3.44% by mass. The addition of titanium improves wear resistance, corrosion resistance, opacity, and antibacterial properties. It also balances the thermal expansion coefficients of the pot blank material and the ceramic base layer, further reducing the possibility of cracking.

[0046] For example, the coefficient of thermal expansion of metallic aluminum is 22~26 (10). -6 / ℃), the coefficient of thermal expansion of titanium is 8~10 (10 / ℃), and the coefficient of thermal expansion of titanium is 8~10 (10 -6 / ℃), while ceramic coatings that do not contain metallic titanium, such as the titanium ceramic coating in this application, have a coefficient of thermal expansion of 7~11 (10 / ℃), and ceramic coatings that do not contain metallic titanium, such as the titanium ceramic coating in this application, have a coefficient of thermal expansion of 7~11 (10 / ℃), while ... -6 / ℃). Thus, the addition of titanium can reduce the difference in thermal expansion coefficients between the coating and the substrate, greatly improving cracking caused by the difference in expansion coefficients.

[0047] Furthermore, the ceramic coating formulation described above also contains polymethylsiloxane and silica sol, which react to form the aforementioned organosilicon-silica hybrid. In this application, the mass content of the organosilicon-silica hybrid is 47.12% to 55.16%. The organosilicon-silica hybrid maintains the high hardness of the ceramic substrate.

[0048] More specifically, the ceramic coating formulation is as follows: polymethylsiloxane, 24%~26% by mass; silica sol, 18%~22% by mass; thermoplastic engineering plastic, 0.5%~1% by mass; water, 15%~20% by mass; filler, 10%~13% by mass; titanium powder, 1%~2% by mass; inorganic pigment, 15%~20% by mass; and alcohol-based solvent, 10%~16% by mass. The above components are dispersed uniformly in a disperser to form the ceramic coating.

[0049] The solid content of the silica sol can be selected from 10% to 50%, preferably 30%. Fillers include alumina, silicon carbide, silicon dioxide, and zirconium dioxide, etc. Alcohol-based solvents can be selected from ethanol or isopropanol, etc.

[0050] The filler includes at least silica powder and zirconium dioxide powder, with silica powder accounting for 20% to 25% of the filler by mass. In addition, the titanium powder has a layer of titanium dioxide on its surface. During the subsequent sintering process, the silica powder, zirconium dioxide powder, and titanium dioxide on the surface of the titanium powder can partially react and combine, further strengthening the three-dimensional network structure and improving the strength of the coating.

[0051] As an optional implementation, the silica powder includes at least three particle size specifications. The silica powder includes micron-sized silica (4~6μm), submicron-sized silica (450~550nm), and nano-sized silica (18~22nm), wherein the micron-sized silica accounts for 49%~51% of the silica powder by mass, the submicron-sized silica accounts for 37%~38% of the silica powder by mass, and the nano-sized silica accounts for 12%~13% of the silica powder by mass. According to this scheme, utilizing the particle size gradient of the silica powder not only improves the pore sealing of the adhesion surface but also enhances toughness, anti-settling, and wear resistance, while also facilitating the increase of film thickness.

[0052] It should be noted that for the above-mentioned ceramic coating formulation, after film formation, the water and alcohol-based solvents evaporate, and the liquid dispersant in the silica sol also evaporates. Based on a silica sol solid content of 30%, the following detailed description is provided.

[0053] When the polymethylsiloxane content is 24%, silica sol content is 18%, thermoplastic engineering plastic content is 1%, water content is 15%, filler content is 13%, titanium powder content is 2%, inorganic pigment content is 17%, and alcohol solvent content is 10%, the total mass fraction of polymethylsiloxane and silica sol in the dry film coating after film formation, that is, the total mass fraction of organosilicon-silica hybrid in the dry film coating is 47.12%.

[0054] When the polymethylsiloxane content is 26%, silica sol content is 22%, thermoplastic engineering plastic content is 0.5%, water content is 15.5%, filler content is 10%, titanium powder content is 1%, inorganic pigment content is 15%, and alcohol solvent content is 10%, the total mass fraction of polymethylsiloxane and silica sol in the dry film coating after film formation, that is, the total mass fraction of organosilicon-silica hybrid in the dry film coating is 55.16%.

[0055] When the composition of polymethylsiloxane is 26%, silica sol is 18%, thermoplastic engineering plastic is 0.5%, water is 15%, filler is 13%, titanium powder is 2%, inorganic pigment is 15.5%, and alcohol solvent is 10%, the percentage of thermoplastic engineering plastic in the dry film mass is 0.80%.

[0056] When the composition of polymethylsiloxane is 24%, silica sol is 18%, thermoplastic engineering plastic is 1%, water is 15%, filler is 10%, titanium powder is 1%, inorganic pigment is 15%, and alcohol solvent is 16%, the thermoplastic engineering plastic accounts for 1.77% of the dry film mass.

[0057] When the composition of polymethylsiloxane is 26%, silica sol is 18%, thermoplastic engineering plastic is 1%, water is 15%, filler is 13%, titanium powder is 1%, inorganic pigment is 16%, and alcohol-based solvent is 10%, the percentage of titanium powder in the dry film mass is 1.60%.

[0058] When the composition of polymethylsiloxane is 24%, silica sol is 18%, thermoplastic engineering plastic is 0.5%, water is 15%, filler is 10%, titanium powder is 2%, inorganic pigment is 15%, and alcohol solvent is 15.5%, the percentage of titanium powder in the dry film mass is 3.52%.

[0059] As one implementation, the inner surface of the pot blank has a sprayed titanium layer. A ceramic undercoat is applied over the sprayed titanium layer, which not only achieves the corrosion resistance and antibacterial properties of the titanium layer itself, but also further improves the hardness of the inner pot. At the same time, the sprayed titanium layer is used as a transition to further balance the difference in the coefficient of thermal expansion between the pot blank and the coating.

[0060] The present application will now be described in more detail with reference to embodiments and comparative examples.

[0061] Example 1 Ceramic coating: polymethylsiloxane, 25% by mass; silica sol (30% solid content), 19% by mass; polyetheretherketone, 0.75% by mass; water, 16% by mass; filler, 11% by mass; titanium powder, 1.5% by mass; inorganic pigment, 15.75% by mass; ethanol, 11% by mass.

[0062] Non-stick coating: polymethylvinylsiloxane, mass ratio 12.5%; polymethylhydrosiloxane, mass ratio 14%; catalyst, mass ratio 0.75%; silicone oil, mass ratio 6%; ethyl silicate, mass ratio 21%; butyl acetate, mass ratio 38.5%; methyl ethyl ketone, mass ratio 5.75%; leveling agent, mass ratio 1.5%.

[0063] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0064] Example 2 Ceramic coating: polymethylsiloxane, 26% by mass; silica sol (30% solid content), 22% by mass; polyetheretherketone, 1% by mass; water, 15% by mass; filler, 10% by mass; titanium powder, 1% by mass; inorganic pigment, 15% by mass; ethanol, 10% by mass.

[0065] The non-stick coating formulation is the same as in Example 1.

[0066] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0067] Example 3 Ceramic coating: polymethylsiloxane, 24% by mass; silica sol (30% solid content), 18% by mass; polyetheretherketone, 0.5% by mass; water, 18% by mass; filler, 11.5% by mass; titanium powder, 2% by mass; inorganic pigment, 16% by mass; ethanol, 10% by mass.

[0068] The non-stick coating formulation is the same as in Example 1.

[0069] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0070] Example 4 The ceramic coating formulation is the same as in Example 1.

[0071] Non-stick coating: polymethylvinylsiloxane, 14% by mass; polymethylhydrosiloxane, 13% by mass; catalyst, 1% by mass; silicone oil, 7% by mass; ethyl silicate, 20% by mass; butyl acetate, 38% by mass; methyl ethyl ketone, 5% by mass; leveling agent, 2% by mass.

[0072] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0073] Example 5 The ceramic coating formulation is the same as in Example 1.

[0074] Non-stick coating: polymethylvinylsiloxane, 11% by mass; polymethylhydrosiloxane, 13% by mass; catalyst, 0.5% by mass; silicone oil, 6.5% by mass; ethyl silicate, 24% by mass; butyl acetate, 38% by mass; methyl ethyl ketone, 5% by mass; leveling agent, 2% by mass.

[0075] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0076] Comparative Example 1 The ceramic coating formulation does not contain polyetheretherketone. The formulation consists of polymethylsiloxane (24% by mass), silica sol (30% solid content) (18% by mass), water (18% by mass), filler (13% by mass), titanium powder (1% by mass), inorganic pigment (16% by mass), and ethanol (10% by mass).

[0077] The non-stick coating formulation is the same as in Example 1.

[0078] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0079] Comparative Example 2 Ceramic coating: polymethylsiloxane, 24% by mass; silica sol (30% solid content), 18% by mass; polyetheretherketone, 1.3% by mass; water, 15% by mass; filler, 10% by mass; titanium powder, 2% by mass; inorganic pigment, 15% by mass; ethanol, 14.7% by mass.

[0080] The non-stick coating formulation is the same as in Example 1.

[0081] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0082] Comparative Example 3 Ceramic coating: polymethylsiloxane, 24% by mass; silica sol (30% solid content), 18% by mass; polyetheretherketone, 0.2% by mass; water, 15% by mass; filler, 11.8% by mass; titanium powder, 1% by mass; inorganic pigment, 20% by mass; ethanol, 10% by mass.

[0083] The non-stick coating formulation is the same as in Example 1.

[0084] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0085] Comparative Example 4 The ceramic coating does not contain titanium powder and has the following formula: polymethylsiloxane, 25% by mass; silica sol (30% solid content), 19% by mass; polyetheretherketone, 1% by mass; water, 17% by mass; filler, 11% by mass; inorganic pigment, 16% by mass; and ethanol, 11% by mass.

[0086] The non-stick coating formulation is the same as in Example 1.

[0087] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0088] Comparative Example 5 Ceramic coating: polymethylsiloxane, 24% by mass; silica sol (30% solid content), 22% by mass; polyetheretherketone, 1% by mass; water, 15% by mass; filler, 10% by mass; titanium powder, 3% by mass; inorganic pigment, 15% by mass; ethanol, 10% by mass.

[0089] The non-stick coating formulation is the same as in Example 1.

[0090] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0091] Comparative Example 6 Ceramic coating: polymethylsiloxane, 24% by mass; silica sol (30% solid content), 18% by mass; polyetheretherketone, 0.5% by mass; water, 16% by mass; filler, 11% by mass; titanium powder, 0.5% by mass; inorganic pigment, 20% by mass; ethanol, 10% by mass.

[0092] The non-stick coating formulation is the same as in Example 1.

[0093] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0094] Comparative Example 7 The ceramic coating formulation is the same as in Example 1.

[0095] The non-stick coating has the following formula: polymethylvinylsiloxane, 17.5% by mass; polymethylhydrosiloxane, 13% by mass; catalyst, 0.5% by mass; silicone oil, 5% by mass; ethyl silicate, 20% by mass; butyl acetate, 38% by mass; methyl ethyl ketone, 5% by mass; and leveling agent, 1% by mass.

[0096] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0097] Comparative Example 8 The ceramic coating formulation is the same as in Example 1.

[0098] The non-stick coating has the following formula: polymethylvinylsiloxane, 7.5% by mass; polymethylhydrosiloxane, 13% by mass; catalyst, 0.5% by mass; silicone oil, 5% by mass; ethyl silicate, 24% by mass; butyl acetate, 43% by mass; methyl ethyl ketone, 6% by mass; and leveling agent, 1% by mass.

[0099] The above-mentioned ceramic coating was sprayed onto the pot blank and dried, then a non-stick coating was sprayed on, and after sintering and curing, performance testing was carried out.

[0100] Comparative Example 9 The existing ceramic coating for the inner pot does not contain thermoplastic engineering plastics or cross-linked elastomers.

[0101] The results of the tests conducted on Examples 1-6 and Comparative Examples 1-9 are shown in Table 1 below.

[0102] Table 1 .

[0103] As can be seen from Examples 1-3 and Comparative Example 1, the addition of polyetheretherketone (PEEK) significantly improves the toughness of the coating, resulting in good impact resistance and abrasion resistance. As can be seen from Examples 1-3 and Comparative Example 2, while adding too much PEEK still provides advantages in impact resistance and abrasion resistance, excessive toughness affects the structural strength of the coating, leading to a decrease in durability or lifespan. As can be seen from Examples 1-3 and Comparative Example 3, insufficient PEEK addition is insufficient to significantly improve impact resistance and abrasion resistance.

[0104] As can be seen from the above Examples 1-3 and Comparative Examples 4-6, the addition of titanium powder can effectively improve the corrosion resistance and impact resistance of the coating.

[0105] Based on the above Examples 1-3 and Comparative Examples 1, 4, and 9, it is evident that the simultaneous addition of thermoplastic engineering plastics and titanium powder to the ceramic substrate in this application significantly improves the corrosion resistance and impact resistance of the coating. Compared to Comparative Example 1, which uses no thermoplastic engineering plastics and has an excessively hard coating, the impact resistance of the embodiment in this application is significantly superior. Compared to Comparative Example 4, which uses no titanium powder and has an excessively soft coating with insufficient strength, the embodiment in this application exhibits advantages in corrosion resistance, impact resistance, and coating lifespan. Compared to Comparative Example 9, which uses neither thermoplastic engineering plastics nor titanium powder, it demonstrates significant advantages in all aspects. In summary, the combined use of thermoplastic engineering plastics and titanium powder not only effectively utilizes the toughness provided by the thermoplastic engineering plastics but also leverages the corrosion resistance of the titanium powder. Furthermore, the reinforcing properties of the titanium powder balance toughness, strength, and stiffness, resulting in outstanding overall coating performance.

[0106] As can be seen from the above Examples 1, 4 and 5 and Comparative Examples 7-9, the cross-linked network structure of the cross-linked elastomer of this application accommodates silicone oil, which greatly improves the coating life, that is, improves the non-stick durability.

[0107] The processes and steps described in all the preferred embodiments above are merely examples. Unless adverse effects occur, various processing operations can be performed in a different order than the above-described processes. The order of steps in the above processes can also be added, combined, or deleted according to actual needs.

[0108] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0109] This application has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative purposes. This application is not limited to the above embodiments. Many variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.

Claims

1. An inner pot for use in a cooking utensil, characterized in that, The inner pot includes: Pot base; A ceramic substrate, wherein the ceramic substrate is located on the inner surface of the pot blank; A surface layer, located above the ceramic substrate, comprising a crosslinked elastomer and silicone oil, wherein the silicone oil is at least partially swollen in the crosslinked network of the crosslinked elastomer.

2. The inner pot according to claim 1, characterized in that, The crosslinked elastomer is vinyl silicone rubber.

3. The inner pot according to claim 1, characterized in that, In the surface layer, the mass fraction of the crosslinked elastomer is 70.6% to 82.2%.

4. The inner pot according to claim 1, characterized in that, In the surface layer, the mass fraction of the silicone oil is 13.5% to 21.5%.

5. The inner pot according to claim 1, characterized in that, The ceramic substrate contains an organosilicon-silica hybrid, and the cross-linked elastomer portion in the surface layer is incorporated into the organosilicon-silica hybrid.

6. The inner pot according to claim 1, characterized in that, The surface layer includes a non-stick surface layer, wherein the non-stick surface layer is formed by forming a non-stick coating film, the formulation of the non-stick coating containing a polysiloxane raw rubber and a crosslinking agent, wherein the polysiloxane raw rubber and the crosslinking agent can undergo a crosslinking reaction to generate the crosslinked elastomer.

7. The inner pot according to claim 6, characterized in that, The non-stick surface layer is attached to the ceramic substrate, and the top layer is formed by coating the ceramic substrate with non-stick paint to form a top coating. The total thickness of the ceramic substrate and the top layer is 25~38μm.

8. The inner pot according to claim 6, characterized in that, The surface layer further includes a ceramic transition layer, which is located between the ceramic base layer and the non-stick surface layer. The ceramic transition layer is connected to the ceramic base layer, and the non-stick surface layer is connected to the ceramic transition layer.

9. The inner pot according to claim 8, characterized in that, The topcoat is formed by first applying a ceramic coating to the ceramic substrate to form an intermediate coating, then applying a non-stick coating to the intermediate coating while it is wet to form a topcoat, and finally sintering and curing the intermediate coating and the topcoat together.

10. The inner pot according to claim 8, characterized in that, The total thickness of the ceramic substrate and the surface layer is 28~42μm.

11. The inner pot according to any one of claims 6-10, characterized in that, The polysiloxane raw rubber includes polymethylvinylsiloxane, and the crosslinking agent includes polymethylhydrosiloxane.

12. The inner pot according to any one of claims 6-10, characterized in that, The formula for the non-stick coating is as follows: Polysiloxane raw rubber, with a mass ratio of 11% to 14%; Crosslinking agent, with a mass ratio of 13% to 16%; Catalyst, with a mass ratio of 0.5% to 1%; Silicone oil, with a mass ratio of 5% to 7%; Ethyl silicate, with a mass ratio of 20% to 24%; Butyl acetate, with a mass ratio of 38% to 43%; Butanone, with a mass ratio of 5% to 7%; Leveling agent, with a mass ratio of 1% to 2%.

13. A cooking utensil, characterized in that, The cooking appliance includes: A pot body, wherein an inner pot is provided in the pot body according to any one of claims 1-12; A lid is provided on the pot body in an openable and closable manner. When the lid is closed on the pot body, a cooking space for stewing is formed between the lid and the pot body.

Images