Ceramic non-stick coating and preparation method thereof as well as non-stick pan and preparation method thereof

Abstract

The invention provides a ceramic non-stick coating and a preparation method thereof as well as a non-stick pan and a preparation method thereof. The ceramic non-stick coating comprises a ceramic coating and a montmorillonite additive dispersed in the ceramic coating, the montmorillonite additive comprises at least one of montmorillonite and modified montmorillonite, the weight of the montmorillonite additive is 5-20 wt% based on the total weight of the ceramic non-stick coating, the montmorillonite has a particle size of 6.5-25 [mu] m, and the montmorillonite has a particle size of 0.5-5 [mu] m. The montmorillonite has a heating expansion ratio of 0.5-2, and the modified montmorillonite has a structure that silicone oil is combined with the montmorillonite. The non-stick pan prepared from the ceramic non-stick coating disclosed by the invention has good lasting non-stick property.

Description

Technical Field

[0001] The present invention relates to the field of cookware, and more specifically, to a ceramic non-stick coating, a method for preparing a non-stick cookware using the ceramic non-stick coating, and a non-stick cookware comprising the ceramic non-stick coating. Background Art

[0002] The existing non-stick technology for cookware is usually to spray ceramic coating (e.g., polysiloxane ceramic coating) on ​​the metal substrate surface of the cookware to achieve the non-stick effect. For example, in the process of preparing polysiloxane ceramic coating using methyltriethoxysilane (MTES) and tetraethyl orthosilicate (TEOS) as precursors, referring to Figure 1 According to the different hydrolysis rates of the two precursors, the process is controlled to prepare SiO2 sol with hydrophobic groups -CH3 and hydrophilic groups -OH on the surface. Through the aging of SiO2 sol, nano-SiO2 spontaneously clusters due to self-assembly to form SiO2 particles with a nano-micron multi-level rough structure. Multiple SiO2 particles with nano-micron multi-level rough structure form a lotus leaf-like structure, so they have good non-stickiness.

[0003] However, the lotus leaf-like structure is easily damaged (such as by the abrasion of food during cooking, by the abrasion of rags, scouring pads or steel wool during cleaning of pots, etc.), which causes the surface roughness of the coating to be damaged, thereby reducing the non-stick property. In other words, the surface roughness of the non-stick coating formed by the existing ceramic coating is also easily damaged without special enhanced damage, thereby reducing the non-stick property of the non-stick coating. Summary of the invention

[0004] The object of the present invention is to provide a ceramic non-stick coating, which utilizes the pore structure and thermal expansion of montmorillonite and / or modified montmorillonite to improve the non-stick property of the ceramic non-stick coating.

[0005] Another object of the present invention is to provide a method for preparing non-stick cookware using the ceramic non-stick coating, which can form more montmorillonite on the surface of the coating by spraying the ceramic non-stick coating twice, thereby improving the non-stickiness of the coating.

[0006] Another object of the present invention is to provide a non-stick cookware, which includes a non-stick coating having the above-mentioned ceramic non-stick coating, and the non-stick coating has good initial non-stick and lasting non-stick effects.

[0007] According to one aspect of the present invention, a ceramic non-stick coating is provided, comprising a ceramic coating and a montmorillonite additive dispersed in the ceramic coating, the montmorillonite additive comprising at least one of montmorillonite and modified montmorillonite, wherein the weight of the montmorillonite additive is 5wt% to 20wt% based on the total weight of the ceramic non-stick coating, wherein the montmorillonite has a particle size of 6.5μm to 25μm and a thermal expansion ratio of 0.5-2, and wherein the modified montmorillonite has a structure in which silicone oil is bonded to montmorillonite.

[0008] In the modified montmorillonite, the weight of the silicone oil is less than or equal to 5 times the weight of the montmorillonite.

[0009] According to another aspect of the present invention, a method for preparing a ceramic non-stick coating is provided, the method comprising: providing a ceramic coating and a montmorillonite additive respectively; mixing and rolling the ceramic coating and the montmorillonite additive to obtain the ceramic non-stick coating.

[0010] The step of providing a montmorillonite additive includes: providing montmorillonite; and immersing at least a portion of the montmorillonite in a silicone oil solution so that the silicone oil is combined with the montmorillonite to obtain a modified montmorillonite.

[0011] The concentration of silicone oil in the silicone oil solution is not higher than 60wt%.

[0012] According to another aspect of the present invention, a ceramic coating is provided. The ceramic coating is formed by using a ceramic non-stick coating, the ceramic coating has surface protrusions, and the height of the surface protrusions is less than 1 / 2 of the particle size of a montmorillonite additive.

[0013] According to another aspect of the present invention, a non-stick cookware is provided. The non-stick cookware includes a substrate and a ceramic coating on the substrate.

[0014] According to another aspect of the present invention, a method for preparing non-stick cookware using ceramic non-stick coating is provided, the method comprising: spraying the ceramic non-stick coating on the surface of a substrate; surface drying the substrate sprayed with the ceramic non-stick coating; and sintering the substrate sprayed with the ceramic non-stick coating to prepare the non-stick cookware.

[0015] The step of spraying the ceramic non-stick coating comprises: spraying a first portion of the ceramic non-stick coating to form a bottom layer; and spraying the remaining portion of the ceramic non-stick coating to form a top layer, wherein the first portion of the ceramic non-stick coating accounts for 30wt%-40wt% of the total weight of the ceramic non-stick coating.

[0016] The surface drying step includes preheating at a temperature of 80 to 120°C for 3 to 5 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic diagram of the non-stick mechanism of ceramic non-stick coatings in the prior art.

[0018] Figure 2 Schematic diagram of a non-stick coating prepared using polymethylsiloxane ceramic coating.

[0019] Figure 3 Schematic diagram of a non-stick coating prepared using the ceramic non-stick coating of the present application.

[0020] Figure 4 It is a schematic diagram of the surface of a non-stick coating formed by spraying a ceramic non-stick coating once.

[0021] Figure 5 is a schematic diagram of the surface of a non-stick coating formed by spraying a ceramic non-stick coating twice according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] Now, the present invention will be more fully described below in conjunction with exemplary embodiments. However, the present invention can be implemented in a variety of different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These embodiments are provided so that the disclosure of the present invention will be thorough and complete, and the scope of the present invention will be fully conveyed to those skilled in the art.

[0023] Hereinafter, the ceramic non-stick coating of the present application will be described in detail.

[0024] In an embodiment of the present application, the ceramic non-stick coating may include a ceramic coating and a montmorillonite additive.

[0025] The ceramic coating may be a ceramic coating commonly used in the art. For example, the ceramic coating may include a polysiloxane ceramic coating. For example, examples of polysiloxane ceramic coatings may include polymethylsiloxane ceramic coatings, polydimethylsiloxane ceramic coatings, and polymethylphenylsiloxane ceramic coatings. However, exemplary embodiments are not limited thereto, and those skilled in the art may select a ceramic coating of appropriate composition as the ceramic coating in the ceramic non-stick coating of the present invention based on the inventive concept.

[0026] The montmorillonite additive as an additive component can be uniformly dispersed in the ceramic coating. The montmorillonite additive can include at least one of montmorillonite and modified montmorillonite.

[0027] Montmorillonite has a porous structure, has strong adsorption, and its internal pores expand when heated. When a ceramic non-stick coating containing montmorillonite is sprayed on the surface of a cookware substrate to form a non-stick coating, on the one hand, when heated, the internal pores of the montmorillonite expand, changing the structure of the coating, making the surface protrusions of the coating larger, thereby increasing the non-stick properties of the coating; on the other hand, the ceramic non-stick coating can form a coating structure similar to a lotus leaf structure to provide non-stick properties; on the other hand, when heated, the internal pores of the montmorillonite increase, which can absorb the grease in the cooking process, ensuring that the coating surface has a certain amount of grease when the cookware is in use, so as to provide good non-stick properties.

[0028] Based on the above structure of montmorillonite, the present invention can also modify the above montmorillonite with silicone oil to obtain modified montmorillonite, thereby further improving the long-lasting non-stickiness of the coating including it. That is, the montmorillonite in the modified montmorillonite in the montmorillonite additive is the same montmorillonite as the montmorillonite in the montmorillonite additive, that is, both are montmorillonites with the above structure.

[0029] For example, the following method can be used to prepare modified montmorillonite: montmorillonite is soaked in a silicone oil solution for 5 to 30 minutes, so that the silicone oil can be fully combined (for example, adsorbed, bonded) with the montmorillonite to prepare the modified montmorillonite. Here, the silicone oil solution may include silicone oil and a solvent, and the silicone oil may be selected from at least one of methyl silicone oil, dimethyl silicone oil, hydroxy silicone oil, hydrogen silicone oil and polyether modified silicone oil, and the solvent may include at least one of xylene, ethyl acetate and tetrahydrofuran. In addition, based on the total weight of the silicone oil solution, the weight content of the silicone oil may be less than or equal to 60wt%, for example, less than or equal to 50wt% or less than or equal to 40wt%. If the weight content of the silicone oil is higher than 60wt%, the viscosity of the silicone oil solution is too high and is not conducive to the adsorption of silicone oil by montmorillonite.

[0030] In an embodiment of the present application, after montmorillonite is modified, a modified montmorillonite in which montmorillonite is combined with silicone oil can be obtained. In the modified montmorillonite, the weight of the silicone oil can be less than or equal to 5 times the weight of the montmorillonite, for example, the weight of the silicone oil can be 2-4 times the weight of the montmorillonite, preferably 3 times. If the weight of the silicone oil is greater than 5 times the weight of the montmorillonite, the surface greasy feeling of the prepared coating is too strong, which affects the user's sense of use. In an embodiment of the present application, since silicone oil has good non-stickiness, when it is adsorbed in the pores of montmorillonite, the non-stickiness of montmorillonite can be further improved.

[0031] Therefore, in an embodiment of the present application, the ceramic non-stick coating may include a ceramic material as a matrix material, and may further include at least one of montmorillonite and modified montmorillonite as a montmorillonite additive. In the ceramic non-stick coating of the present application, the weight of the montmorillonite additive (i.e., montmorillonite and / or modified montmorillonite) may be 5wt% to 20wt% (e.g., 8wt% to 18wt%, 10wt% to 16wt%, 11wt% to 15wt% or 12wt% to 14wt%) based on the total weight of the ceramic non-stick coating. If the weight of the montmorillonite additive is less than 5wt%, the durable non-stick improvement is not obvious; if the weight of the montmorillonite additive is greater than 20wt%, the wear resistance of the coating decreases.

[0032] In an embodiment of the present application, the montmorillonite may have a particle size of 6.5 μm to 25 μm (e.g., 8 μm to 20 μm, 10 μm to 18 μm, or 12 μm to 16 μm), and the montmorillonite may have a thermal expansion ratio of 0.5-2 (e.g., 1.8-0.9, 1.6-1.0, or 1.5-1.2). The thermal expansion ratio may be defined as the multiple of the volume expansion of the montmorillonite when it is heated. For example, if the volume of the montmorillonite before heating is 1 and the volume of the montmorillonite after heating is 1.5, the thermal expansion ratio of the montmorillonite is 0.5. The thermal expansion ratio of montmorillonite is related to the particle size of montmorillonite. The smaller the particle size of montmorillonite, the larger the thermal expansion ratio of montmorillonite; conversely, the larger the particle size of montmorillonite, the smaller the thermal expansion ratio of montmorillonite.

[0033] In the embodiments of the present application, the volume of montmorillonite increases when it expands due to heat. On the one hand, the increase in volume can increase its internal pores, increase the adsorption of grease, and improve its non-stickiness; on the other hand, the increase in volume can further increase the protrusions of the coating, thereby improving its non-stickiness. If the thermal expansion ratio of montmorillonite is less than 0.5 (corresponding to a particle size of montmorillonite greater than 25 μm), the particle size of montmorillonite is large, resulting in a decrease in the smoothness of the coating surface, which is not conducive to the beauty of the coating; if the thermal expansion ratio of montmorillonite is greater than 2 (for a particle size of montmorillonite less than 6.5 μm), the volume expands greatly when heated, and the montmorillonite is easily damaged.

[0034] In the embodiment of the present application, when the weight content of the montmorillonite additive in the ceramic non-stick coating is constant, the smaller the particle size of the montmorillonite additive, the more the content of the powder particles of the montmorillonite additive in the ceramic non-stick coating, and accordingly, in the non-stick coating formed, the content of the montmorillonite additive on the coating surface is more, and the non-stick property of the non-stick coating is good. However, the content of the montmorillonite additive on the coating surface is more, and the wear resistance of the coating will deteriorate. On the contrary, when the weight content of the montmorillonite additive in the ceramic non-stick coating is constant, the larger the particle size of the montmorillonite additive, the less the content of the powder particles of the montmorillonite additive in the ceramic non-stick coating, and accordingly, in the non-stick coating formed, the content of the montmorillonite additive on the coating surface is less, and the wear resistance of the non-stick coating is higher. However, the content of the montmorillonite additive on the coating surface is less, and the non-stick property of the coating will deteriorate. Therefore, in order to consider both the wear resistance and non-stick property of the non-stick coating at the same time, in the embodiment of the present application, the particle size of montmorillonite can be controlled to be within the range of 6.5 μm to 25 μm.

[0035] In an embodiment of the present application, the method for preparing a ceramic non-stick coating comprises: placing the ceramic coating in a coating bucket, then adding a montmorillonite additive, and thereafter rolling the coating bucket for 0.5 to 2 hours to prepare the ceramic non-stick coating.

[0036] Hereinafter, a method for preparing a non-stick cookware using the ceramic non-stick coating of the present application will be described with reference to the accompanying drawings.

[0037] Figure 2 Schematic diagram of a non-stick coating prepared using polymethylsiloxane ceramic coating. Figure 3 Schematic diagram of a non-stick coating prepared using the ceramic non-stick coating of the present application. Figure 4 It is a schematic diagram of the surface of a non-stick coating formed by spraying a ceramic non-stick coating once. Figure 5 is a schematic diagram of the surface of a non-stick coating formed by spraying a ceramic non-stick coating twice according to an embodiment of the present disclosure.

[0038] In an embodiment of the present application, a method for preparing a non-stick cookware using the ceramic non-stick coating of the present application may include: spraying the ceramic non-stick coating on the surface of a cookware substrate to form a non-stick coating precursor on the surface of the cookware substrate; and sintering the cookware to prepare a non-stick cookware including a non-stick coating on the cookware substrate.

[0039] In an embodiment of the present application, the step of spraying the ceramic non-stick coating may include: spraying a first portion of the ceramic non-stick coating on the cookware substrate to form a bottom layer; and spraying the remaining portion of the ceramic non-stick coating on the bottom layer to form a top layer, wherein the first portion of the ceramic non-stick coating used to form the bottom layer accounts for 30wt%-40wt% (preferably, 1 / 3 (33.3wt%)) of the total weight of the ceramic non-stick coating. Here, the spraying process may be air spraying, thermal spraying, etc., and the present invention does not limit the spraying process.

[0040] By spraying the ceramic non-stick coating twice, more montmorillonite and / or modified montmorillonite can be formed on the surface of the coating, thereby improving the non-stick property of the coating. However, the first part of the ceramic non-stick coating used to form the bottom layer cannot exceed 40wt% of the total weight of the ceramic non-stick coating, otherwise the wear resistance of the coating will be reduced.

[0041] Specifically, refer to Figure 4 , the non-stick coating formed by spraying the ceramic non-stick coating on the surface of the pot once obviously has relatively less montmorillonite on the surface. Figure 5 The non-stick coating formed by spraying the ceramic non-stick coating on the surface of the pot twice obviously has relatively more montmorillonite on the surface. The more montmorillonite on the surface of the non-stick coating, the better the non-stick property of the non-stick coating.

[0042] By the above two-step spraying method, a non-stick coating precursor including montmorillonite and / or modified montmorillonite can be obtained. However, in order to make the bond between the non-stick coating formed by the non-stick coating precursor and the substrate stronger, the substrate can be sandblasted before spraying the ceramic non-stick coating to increase the roughness of the substrate. For example, the surface roughness of the substrate can reach Ra3-Ra6 by sandblasting. In addition, for the subsequent spraying process, before spraying (further, after sandblasting), the subsequent spraying process can be further optimized by preheating the substrate to 50-60°C.

[0043] After the non-stick coating precursor is formed through the spraying process, the non-stick coating precursor may be subjected to a sintering process.

[0044] In an embodiment of the present application, the sintering process may include a surface drying process and a main sintering process.

[0045] The surface drying process may include preheating the pan substrate on which the non-stick coating precursor is formed at a temperature of 80 to 120° C. for 3 to 5 minutes. The surface drying step solidifies the surface to prevent dust from falling into the pan and affecting the appearance of the coating surface, and preheats the coating to prevent problems such as cracking of the coating due to a rapid increase in temperature during sintering.

[0046] After the surface drying process, the main sintering process can be carried out. Here, the main sintering process includes: placing the product in an oven or a tunnel furnace and keeping the product at 280℃±20℃ for 5 to 10 minutes.

[0047] After the main sintering process, the cookware having the non-stick coating including the montmorillonite additive formed on the substrate according to the present invention can be obtained.

[0048] In an embodiment of the present application, the method for preparing non-stick cookware using the ceramic non-stick coating of the present application can make the surface of the prepared non-stick coating have relatively more montmorillonite, and better form a protrusion structure on the surface of the substrate to improve the non-stick property of the prepared non-stick coating.

[0049] For example, refer to Figure 2 In the non-stick coating prepared by using the existing ceramic coating, the lotus leaf-like external group -CH3 will form "fluff" on the coating surface, and the "fluff" can make the non-stick coating non-sticky. Figure 3 In the non-stick coating prepared by using the ceramic non-stick coating of the present application, the lotus leaf-like external group -CH3 and the montmorillonite additive together form "fluff" on the coating surface. Figure 2 and Figure 3 It can be seen that the "fluff" structure of the non-stick coating of the present application is significantly larger in size than the "fluff" structure of the non-stick coating of the prior art (equivalent to increasing the surface protrusions of the coating), making the surface of the non-stick coating of the present application rougher than the surface of the non-stick coating of the prior art, thereby improving the non-stick properties of the non-stick coating.

[0050] In an embodiment of the present application, the height of the "villi" structure (surface protrusions of the coating, i.e., the external group -CH3 of the lotus leaf-like structure together with the montmorillonite additive constitutes the surface protrusions) is less than 1 / 2 of the particle size of the montmorillonite additive powder. When the height of the surface protrusions is greater than 1 / 2 of the particle size of the montmorillonite additive powder, the height of the surface protrusions accounts for too much of the overall height of the montmorillonite additive powder, and the protrusions are easily "pulled up" during use, reducing the service life. The height of the surface protrusions is related to the particle size of the montmorillonite additive powder. The larger the particle size of the montmorillonite additive powder, the larger the height of the surface protrusions formed. In an embodiment of the present application, the montmorillonite additive has a particle size of 6.5 μm to 25 μm. Within this particle size range, the height of the surface protrusions formed can be less than 1 / 2 of the particle size of the montmorillonite additive powder.

[0051] On the other hand, the internal pores of the montmorillonite in the non-stick coating increase when heated, allowing it to absorb more grease from the cooking process, ensuring that the coating surface has more grease when the pot is in use, thereby providing good non-stick properties.

[0052] On the other hand, Figure 3 As shown in , the surface of montmorillonite has a micro-convex structure, that is, the micro-convex structure on the surface of montmorillonite is an inherent property of montmorillonite. The space between the micro-convex structures on the surface of montmorillonite can store oil. Montmorillonite expands in volume when heated, resulting in an increase in the distance between the micro-convex structures on the surface of montmorillonite, thereby increasing the oil storage performance to improve the non-stick properties of the non-stick coating. At room temperature, the distance between the micro-convex structures of montmorillonite is 15μm to 100μm.

[0053] 1.1 Effect of montmorillonite particle size and / or thermal ratio on the non-stick properties of non-stick coatings.

[0054] Example 1

[0055] Montmorillonite with a particle size of 6.5 μm is added to the polymethylsiloxane ceramic coating to prepare a ceramic non-stick coating, wherein the thermal expansion ratio of the montmorillonite is 2, and the weight content of the montmorillonite is 10 wt % based on the total weight of the ceramic non-stick coating.

[0056] The cookware substrate is sandblasted to make its surface roughness Ra 5; the cookware substrate is preheated to 55°C; the first part of the ceramic non-stick coating is sprayed to form a bottom layer, and then the remaining part of the ceramic non-stick coating is sprayed to form a top layer, wherein the first part of the ceramic non-stick coating accounts for 33.3wt% of the total weight of the ceramic non-stick coating; the substrate sprayed with the ceramic non-stick coating is surface dried at 100°C for 5 minutes; then, sintering is performed, wherein the sintering temperature is 280°C and the sintering time is 10 minutes, to prepare a non-stick cookware with a non-stick coating. After testing, the height of the surface protrusion of the non-stick coating is 3μm.

[0057] Example 2

[0058] The difference from Example 1 is that the particle size of montmorillonite is 8 μm, and the thermal expansion ratio of montmorillonite is 1.8. After testing, the height of the surface protrusions of the non-stick coating is 3.5 μm.

[0059] Example 3

[0060] The difference from Example 1 is that the particle size of montmorillonite is 12 μm, and the thermal expansion ratio of montmorillonite is 1.5. After testing, the height of the surface protrusions of the non-stick coating is 5 μm.

[0061] Example 4

[0062] The difference from Example 1 is that the particle size of montmorillonite is 16 μm, and the thermal expansion ratio of montmorillonite is 1.2. After testing, the height of the surface protrusions of the non-stick coating is 6 μm.

[0063] Example 5

[0064] The difference from Example 1 is that the particle size of montmorillonite is 20 μm, and the thermal expansion ratio of montmorillonite is 0.9. After testing, the height of the surface protrusions of the non-stick coating is 8 μm.

[0065] Example 6

[0066] The difference from Example 1 is that the particle size of montmorillonite is 25 μm, and the thermal expansion ratio of montmorillonite is 0.5. After testing, the height of the surface protrusions of the non-stick coating is 12 μm.

[0067] Comparative Example 1

[0068] The difference from Example 1 is that the particle size of montmorillonite is 5.5 μm, and the thermal expansion ratio of montmorillonite is 2.5. After testing, the height of the surface protrusions of the non-stick coating is 2 μm.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that the particle size of montmorillonite is 40 μm, and the thermal expansion ratio of montmorillonite is 0.3. After testing, the height of the surface protrusions of the non-stick coating is 18 μm.

[0071] 1.2 Effect of modified montmorillonite on the non-stick properties of non-stick coatings.

[0072] Example 7

[0073] The difference from Example 1 is that the montmorillonite is methyl silicone oil-modified montmorillonite, wherein the weight of the methyl silicone oil in the methyl silicone oil-modified montmorillonite is 1 times the weight of the montmorillonite.

[0074] Example 8

[0075] The difference from Example 7 is that the weight of the methyl silicone oil is 5 times the weight of the montmorillonite.

[0076] Comparison Example 3

[0077] The difference from Example 7 is that the weight of the methyl silicone oil is 6 times the weight of the montmorillonite.

[0078] 1.3 Effect of the weight content of montmorillonite / modified montmorillonite on the non-stick properties of the non-stick coating.

[0079] Example 9

[0080] The difference from Example 1 is that the weight content of montmorillonite is 5 wt % based on the total weight of the ceramic non-stick coating.

[0081] Example 10

[0082] The difference from Example 1 is that the weight content of montmorillonite is 20 wt % based on the total weight of the ceramic non-stick coating.

[0083] Embodiment 11

[0084] The difference from Example 7 is that, based on the total weight of the ceramic non-stick coating, the weight content of the modified montmorillonite is 5 wt %.

[0085] Example 12

[0086] The difference from Example 7 is that, based on the total weight of the ceramic non-stick coating, the weight content of the modified montmorillonite is 20 wt %.

[0087] Comparison Example 4

[0088] The difference from Example 1 is that the weight content of montmorillonite is 3 wt % based on the total weight of the ceramic non-stick coating.

[0089] Comparative Example 5

[0090] The difference from Example 1 is that the weight content of montmorillonite is 25 wt % based on the total weight of the ceramic non-stick coating.

[0091] 1.4 The influence of the number of spraying times and the amount of spraying each time on the non-stick properties of the non-stick coating.

[0092] Embodiment 13

[0093] The difference from Example 1 is that the first part of the ceramic non-stick coating accounts for 30% of the total weight of the ceramic non-stick coating.

[0094] Embodiment 14

[0095] The difference from Example 1 is that the first part of the ceramic non-stick coating accounts for 40% of the total weight of the ceramic non-stick coating.

[0096] Comparative Example 6

[0097] The difference from Example 1 is that the ceramic non-stick coating is sprayed on the surface of the substrate at one time.

[0098] Comparative Example 7

[0099] The difference from Example 1 is that the first part of the ceramic non-stick coating accounts for 20 wt % of the total weight of the ceramic non-stick coating.

[0100] Comparative Example 8

[0101] The difference from Example 1 is that the first part of the ceramic non-stick coating accounts for 50 wt % of the total weight of the ceramic non-stick coating.

[0102] After testing, the initial non-stick property, non-stick durability and hardness of the non-stick coating prepared above are shown in Table 1 below.

[0103] The test method is:

[0104] (1) Initial non-stick test method: GB / T32095.2-2015 fried egg non-stick test method, this method is an initial non-stick test, divided into levels I, II, and III, with level I being the best and level III being the worst;

[0105] (2) Non-stick durability test method: The non-stick durability test method in GB / T32388-2015, the unit is the number of times, the higher the number, the longer the life, the non-stick result is evaluated once every 1000 times, and the number of times when it reaches level III is recorded;

[0106] (3) Wear resistance: GB / T32388-2015 long-term non-stick test method, after 1000 times of wear, clean and dry, record the mass loss before and after 1000 times of wear. The greater the mass, the worse the wear resistance. The mass loss should be less than 1.5g. When ≥1.5g, hard food is on the surface film layer, which is very easy to scratch and has a short service life.

[0107] Table 1

[0108]

[0109]

[0110] Referring to Table 1, in combination with Examples 1-6 and Comparative Examples 1 and 2, it can be seen that when the particle size of montmorillonite is less than 6.5 μm, the wear resistance of the non-stick coating formed is poor (mass loss is 1.51). When the particle size of montmorillonite is greater than 25 μm, the initial non-stick test and non-stick durability of the non-stick coating formed are poor. In combination with Examples 7 and 8 and Comparative Example 3, it can be seen that when the montmorillonite is methyl silicone oil-modified montmorillonite, the non-stick coating formed has significantly improved non-stick durability. When the weight of the methyl silicone oil exceeds 5 times the weight of the montmorillonite, the methyl silicone oil exceeds the maximum adsorption amount of the montmorillonite, and the surface of the non-stick coating formed is severely greasy, and the long-lasting non-stickiness is not improved. In combination with Examples 9-12 and Comparative Examples 4 and 5, it can be seen that when the addition amount of montmorillonite is less than 5wt%, the non-stickiness of the non-stick coating formed is poor. When the amount of montmorillonite added is greater than 20wt%, the wear resistance of the formed non-stick coating is poor due to the large amount of montmorillonite added. In combination with Examples 13-14 and Comparative Examples 6, 7 and 8, it can be seen that when the ceramic non-stick coating is sprayed on the surface of the substrate once, the montmorillonite content on the surface of the formed non-stick coating is small, resulting in poor non-stickiness of the non-stick coating. When the first part of the ceramic non-stick coating accounts for 20wt% of the total weight of the ceramic non-stick coating, the montmorillonite content on the surface of the formed non-stick coating is small, resulting in poor non-stickiness of the non-stick coating. When the first part of the ceramic non-stick coating accounts for 50wt% of the total weight of the ceramic non-stick coating, the montmorillonite content on the surface of the formed non-stick coating is large, resulting in poor wear resistance of the non-stick coating.

[0111] Although the present invention has been specifically shown and described with reference to exemplary embodiments of the present invention, it will be understood by those skilled in the art that various changes in form and detail may be made herein without departing from the spirit and scope of the present invention as defined by the claims and their equivalents. The embodiments should be considered in a descriptive sense only and not for the purpose of limitation. Therefore, the scope of the present invention is not limited by the specific embodiments of the present invention, but by the claims, and all differences within the scope will be interpreted as included in the present invention.

Claims

1. A ceramic non-stick coating, characterized in that: The ceramic non-stick coating comprises a ceramic coating and a montmorillonite additive dispersed in the ceramic coating. The montmorillonite additive comprises at least one of montmorillonite and modified montmorillonite, Wherein, based on the total weight of the ceramic non-stick coating, the weight of the montmorillonite additive is 5wt% to 20wt%, The montmorillonite has a particle size of 6.5 μm to 25 μm and a thermal expansion ratio of 0.5-2, and The modified montmorillonite has a structure in which silicone oil is combined with montmorillonite.

2. The ceramic non-stick coating according to claim 1, characterized in that: In the modified montmorillonite, the weight of the silicone oil is less than or equal to 5 times the weight of the montmorillonite.

3. A method for preparing the ceramic non-stick coating according to claim 1, characterized in that: The method comprises: Provide ceramic coatings and montmorillonite additives respectively; The ceramic coating and montmorillonite additive are mixed and rolled to obtain a ceramic non-stick coating.

4. The method according to claim 3, characterized in that The steps of providing the montmorillonite additive include: providing montmorillonite; and At least a portion of the montmorillonite is immersed in a silicone oil solution so that the silicone oil is combined with the montmorillonite to obtain a modified montmorillonite.

5. The method according to claim 4, characterized in that The concentration of silicone oil in the silicone oil solution is not higher than 60wt%.

6. A ceramic coating, characterized in that: The ceramic coating is formed by using the ceramic non-stick coating according to claim 1, The ceramic coating has surface protrusions, and the height of the surface protrusions is less than 1 / 2 of the particle size of the montmorillonite additive.

7. A non-stick cookware, characterized in that: The non-stick cookware comprises a substrate and a ceramic coating as claimed in claim 6 located on the substrate.

8. A method for preparing non-stick cookware using the ceramic non-stick coating according to claim 1, characterized in that: The method comprises: Spraying the ceramic non-stick coating on the surface of the substrate; Surface drying of ceramic non-stick coatings; and The substrate sprayed with the ceramic non-stick coating is sintered to prepare a non-stick cookware.

9. The method according to claim 8, characterized in that The step of spraying the ceramic non-stick coating comprises: spraying a first portion of the ceramic non-stick coating to form a bottom layer; and Spray the remaining portion of the ceramic non-stick coating to form a top layer, The first part of the ceramic non-stick coating accounts for 30wt%-40wt% of the total weight of the ceramic non-stick coating.

10. The method according to claim 8, characterized in that The surface drying step includes preheating at a temperature of 80 to 120°C for 3 to 5 minutes.

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