Non-stick coating layer, non-stick paint set and cookware

Abstract

A non-stick coating layer, a non-stick paint set, and a cookware are proposed. The non-stick coating layer includes a lower coating layer whose color tone is suitable for masking the color tone of the substrate, and an upper coating layer that is provided on a surface of the lower coating layer opposite to the substrate and that includes a fluorine-based resin.

Description

[Technical field]

[0001] The present application relates to the field of cookware technology, and in particular to a non-stick coating layer, a non-stick paint set, and a cookware. [Background technology]

[0002] The surface of the non-stick cookware is usually coated with a non-stick coating to achieve the non-stick function, but it will yellow after high temperature, and at the same time, the metal substrate of the cookware will also yellow to different degrees after high temperature, which greatly limits the color selection range of the non-stick coating layer. Therefore, at present, the related technology of the non-stick cookware still has room for improvement. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application aims to solve at least to some extent one of the technical problems in the related art. Therefore, one objective of the present application is to propose a non-stick coating layer that can effectively improve yellowing. [Means for solving the problem]

[0004] In one aspect of the present application, the present application provides a non-adhesive coating layer. According to an embodiment of the present application, the non-adhesive coating layer includes a lower coating layer, the color tone of which is suitable for masking the color tone of the substrate, and an upper coating layer, which is provided on one surface of the lower coating layer opposite to the substrate and includes a fluororesin. In the non-adhesive coating layer, the color tone of the substrate can be effectively masked by adding a material capable of masking the color tone of the substrate to the lower coating layer, thereby effectively solving the high-temperature yellowing problem of the non-adhesive coating layer and the substrate provided with the non-adhesive coating layer without changing the performance of the non-adhesive coating layer.

[0005] According to an embodiment of the present application, the color tone of at least one material in the lower coating layer is suitable for masking color tone changes of the substrate.

[0006] According to an embodiment of the present application, the color tone of at least one material in the lower coating layer masks at least 90% of the color tone of the substrate, or the color tone of at least one material in the lower coating layer masks at least 90% of the change in color tone of the substrate.

[0007] According to an embodiment of the present application, the lower coating layer includes a first pigment, the first pigment having a first color tone, the first color tone being suitable for masking the color tone of the substrate, and according to an embodiment of the present application, the upper coating layer includes a second pigment, the color tone of the second pigment being the same or different from the color tone of the first pigment.

[0008] According to the embodiment of the present application, the color difference value between the color tone of the non-adhesive coating layer and the color tone of the substrate is ΔE=2-8 based on the color tone of the substrate.

[0009] According to the embodiment of the present application, the color difference value between the color tone of the anti-adhesive coating layer and the color tone of the substrate is 2.5-6.

[0010] According to an embodiment of the present application, the non-stick coating layer exhibits a color tone of the second pigment or a color tone between the first pigment and the second pigment.

[0011] According to an embodiment of the present application, the first pigment comprises at least one of a white pigment and a whitish pigment, and the second pigment comprises a metallic pigment.

[0012] According to the embodiment of the present application, the color difference value between the color tone of the first pigment and the white tone is 0-30 based on the white tone.

[0013] According to the embodiment of the present application, the color difference value between the color tone of the first pigment and the white tone is 0-15, based on the white tone.

[0014] According to an embodiment of the present application, the metallic pigment is in a flake shape, and orthogonal projections of at least two flake pigments in a direction perpendicular to the non-stick coating layer overlap each other.

[0015] According to the examples of the present application, the color tone of the non-adhesive coating layer is substantially the same as the color tone of the substrate.

[0016] According to an embodiment of the present application, the lower coating layer comprises a first matrix resin and a first pigment dispersed in the first matrix resin, and the lower coating layer satisfies at least one of the following conditions: the first pigment comprises a white pigment, and the white pigment comprises at least one of titanium, a titanium compound, zinc oxide, alumina, and mica; the particle size of the first pigment is 5-25 microns; the first matrix resin comprises at least one of polyethersulfone and polytetrafluoroethylene; the thickness of the lower coating layer is 6-30 μm; and based on the total mass of the lower coating layer, the mass percentage of the first pigment is 5-40%.

[0017] According to the present examples, the mass percentage of the first pigment is 10-27%, based on the total mass of the lower coating layer.

[0018] According to an embodiment of the present application, the upper coating layer comprises the fluororesin and a second pigment dispersed in the fluororesin, and the upper coating layer satisfies at least one of the following conditions: the second pigment comprises a metallic pigment, and the metallic pigment comprises at least one of silver powder and aluminum powder; the fluororesin comprises polytetrafluoroethylene; the thickness of the upper coating layer is 8-20 μm; and based on the total mass of the upper coating layer, the mass percentage of the second pigment is 1.5-12%.

[0019] According to the embodiment of the present application, the non-adhesive coating layer is formed under the condition that the titanium compound contains titanium oxide, and the particle sizes of the silver powder and the aluminum powder are each independently 2~70 At least one of the conditions is met:

[0020] According to an embodiment of the present application, the non-adhesive coating layer satisfies at least one of the following conditions: the lower coating layer further includes at least one of a high temperature resistant resin, a first surfactant, a first pH adjuster, and wear-resistant particles; and the upper coating layer includes at least one of a second surfactant and a second pH adjuster.

[0021] According to an embodiment of the present application, the non-stick coating layer satisfies at least one of the following conditions: the high temperature resistant resin includes at least one of polyphenylene sulfide, polyamide-imide, and polyether ether ketone; the first surfactant and the second surfactant each independently include at least one of a nonionic surfactant and an anionic surfactant; the first pH adjuster and the second pH adjuster each independently include at least one of ammonia water, triethylamine, and diethanolamine; and the wear-resistant particles include at least one of Al2O3, SiO2, and SiC.

[0022] According to an embodiment of the present application, the first matrix resin is a mixture of polyethersulfone and polytetrafluoroethylene, the white pigment is titanium oxide, the fluorine-based resin is polytetrafluoroethylene, and the metallic pigment is silver powder or aluminum powder.

[0023] In another aspect of the present application, the present application provides a non-adhesive paint set. According to an embodiment of the present application, the non-adhesive paint set includes an undercoat, the color tone of which is suitable for masking the color tone of a substrate, and an overcoat containing a fluororesin. In the non-adhesive paint set, by adding a material suitable for masking the color tone of a substrate to the undercoat, not only can the yellowing of the substrate provided with a coating layer made of the non-adhesive paint set be masked, but also the yellowing of the coating layer itself can be avoided.

[0024] According to an embodiment of the present application, the undercoat is 30 to 50 parts by weight of a first matrix resin dispersion, High temperature resistant resin 10~30 parts by weight, 20 to 50 parts by weight of a first solvent, 1 to 12 parts by weight of the first pigment, 0 to 10 parts by weight of a first surfactant, Deionized water 0 to 50 parts by weight, 0 to 1 part by weight of a first pH adjuster, Wear-resistant particles: 0 to 3 parts by weight.

[0025] According to an embodiment of the present application, the top coat is Fluorine-based resin emulsion 45 to 70 parts by weight, 3 to 20 parts by weight of a second solvent, 0.5 to 5 parts by weight of the second pigment, 0 to 10 parts by weight of a second surfactant, Deionized water 10 to 50 parts by weight, The second pH adjuster is 0 to 1 part by weight.

[0026] According to an embodiment of the present application, the non-stick paint set is used to form the above-mentioned non-stick coating layer, the undercoat is used to form the lower coating layer, and the top coat is used to form the upper coating layer.

[0027] In a further aspect of the present application, the present application provides a cooking utensil, which according to an embodiment of the present application includes a metal substrate and a non-stick coating layer, the non-stick coating layer being formed on a surface of the metal substrate and being made of the non-stick paint set as described above.

[0028] According to an embodiment of the present application, the color tone of at least a part of the cooking utensil in its initial state is the same as its color tone in its heated state, or the color difference value ΔE between the color tone of at least a part of the cooking utensil in its initial state and its heated state is less than 4.

[0029] According to the examples of the present application, the color tone of the initial state of at least a part of the equipment is the same as the color tone of the heated state, or the color difference value ΔE between the color tone of the initial state and the color tone of the heated state of at least a part of said cooking utensil is less than 2.

[0030] According to an embodiment of the present application, the metal substrate comprises stainless steel.

[0031] According to an embodiment of the present application, the surface of the metal substrate is flat, and the non-adhesive fluorine coating layer is provided on the flat surface; alternatively, the surface of the metal substrate has a plurality of recesses spaced apart from one another, and the non-adhesive fluorine coating layer is provided on the inner walls of the recesses.

[0032] According to an embodiment of the present application, in each of the recesses, the surface of the non-adhesive coating layer away from the metal substrate is a curved surface whose central portion protrudes toward the metal substrate, and the surface of the non-adhesive coating layer away from the metal substrate is lower than the protruding surface.

[0033] According to an embodiment of the present application, the inner wall surface of the recess is a continuous arc surface, and the thickness of the bottom of the non-stick coating layer in each recess is greater than the thickness of the sidewall of the non-stick coating layer.

[0034] According to an embodiment of the present application, in each of the recesses, the thickness of the non-stick coating layer gradually increases in the direction from the top to the bottom of the recess.

[0035] According to an embodiment of the present application, the color of the non-stick coating layer is substantially the same as the color of the raised surface.

[0036] According to an embodiment of the present application, the non-adhesive coating layer is configured to have a continuous arcuate surface, and both the lower coating layer and the upper coating layer of the non-adhesive coating layer are configured to have a continuous arcuate surface. [Brief description of the drawings]

[0037] The above and / or additional aspects and advantages of the present application will become apparent and will be readily understood from the following detailed description of the embodiments with reference to the drawings, in which:

[0038] [Figure 1] 2 is a schematic diagram of the structure of a non-adhesive fluorine coating layer according to an embodiment of the present application. [Diagram 2] 1 is a schematic diagram of a partial structure of a cooking utensil according to an embodiment of the present application. [Diagram 3] FIG. 4 is a schematic diagram of a partial structure of a cooking utensil according to another embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] The following examples of the present application are described in detail. The following examples are illustrative and are used only to interpret the present application, and should not be understood as limiting the present application. If no specific techniques or conditions are shown in the examples, they should be carried out according to the techniques or conditions described in the literature of the field, or according to the product specifications. If no manufacturer is shown for the reagents or equipment used, they are conventional products that can be purchased commercially.

[0040] In one aspect of the present application, the present application provides a non-adhesive coating layer. According to an embodiment of the present application, referring to FIG. 1, the non-adhesive coating layer includes a lower coating layer 10, the color tone of which is suitable for masking the color tone of the substrate, and an upper coating layer 20, which is provided on one surface of the lower coating layer opposite to the substrate and includes a fluororesin. In the non-adhesive coating layer, the material suitable for masking the color tone of the substrate is added to the lower coating layer, so that the high-temperature yellowing problem of the non-adhesive coating layer and the substrate provided with the non-adhesive coating layer can be effectively solved without changing the performance of the non-adhesive coating layer, and the yellowing resistance and appearance effect of the non-adhesive coating system can be greatly improved, thereby expanding the scope of use of the non-adhesive coating layer.

[0041] According to the embodiment of the present application, the color tone of the at least one material in the lower coating layer is suitable for masking the change in color tone of the substrate. Thus, the non-adhesive coating layer can effectively mask the yellowing of the substrate. In some specific embodiments, the color tone of the at least one material in the lower coating layer masks at least 90% of the color tone of the substrate, or the color tone of the at least one material in the lower coating layer masks at least 90% of the change in color tone of the substrate. Thus, the non-adhesive coating layer has an excellent effect of masking the yellowing of the substrate.

[0042] According to an embodiment of the present application, the lower coating layer contains a first pigment, the first pigment has a first color tone, and the first color tone is suitable for masking the color tone of the substrate. Thus, even if yellowing of the substrate occurs during use, it can be effectively masked by the lower coating layer, and the yellowing of the substrate cannot be seen from the appearance of the product, thereby effectively improving the problem of yellowing of the substrate. Furthermore, the interference of the substrate color tone with the color tone of the non-adhesive coating system can be reduced, thereby greatly improving the appearance effect of the non-adhesive coating system.

[0043] According to some specific embodiments of the present application, in order to better improve the high-temperature yellowing problem of the non-adhesive coating layer and the substrate provided with the non-adhesive coating layer, the first pigment may include at least one of a white pigment and a whitish pigment. Specifically, the white pigment may include at least one of titanium, titanium compounds, zinc oxide, alumina and mica, and specifically, the titanium compounds may include titanium oxide. Specifically, titanium oxide is a white inorganic pigment, which is non-toxic, has optimal opacity, optimal whiteness and brightness, has strong adhesion, is not prone to chemical changes, and is always pure white and does not yellow after high temperature. This provides a wide source of material, has a good effect of shielding yellowing, and does not affect the non-adhesive performance of the non-adhesive coating layer and its binding strength with the substrate.

[0044] According to some specific embodiments of the present application, the color difference value between the color tone of the first pigment and the white tone based on the white tone may be 0-30, specifically, for example, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 25, 30, etc., and may be 0-15. It has good yellowing resistance and yellowing shielding effect.

[0045] According to some specific embodiments of the present application, the particle size of the first pigment may be 5-25 microns, specifically, for example, 5 microns, 8 microns, 10 microns, 12 microns, 15 micron, 18 micron, 20 The particle size of the first pigment is 1.0 microns, 22 microns, 25 microns, etc. Within this particle size range, the pigment has excellent coloring effect, yellowing resistance effect, and yellowing masking effect, is easy to disperse, can function well in combination with other components of the non-adhesive coating layer, is convenient to manufacture the non-adhesive coating layer, and is advantageous to improve the quality of the non-adhesive coating layer. If the particle size of the first pigment is larger than the above range, the dispersibility of the first pigment in the paint forming the lower coating layer is low, and the yellowing masking effect is poor.

[0046] According to an embodiment of the present application, based on the total weight of the lower coating layer, the weight percentage of the first pigment is 5-40%, specifically, for example, 5%, 8%, 10%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 30%, 32%, 35%, 38 %, 40%, etc., specifically, it may be 12-27%. Within this content range, the color effect, masking power, and antiseptic performance of the non-adhesive coating layer are optimal, and if it is too much, it will affect the binding power and antiseptic performance of the non-adhesive coating layer, and if it is too little, the masking power of the non-adhesive coating layer will decrease.

[0047] According to the embodiments of the present application, it can be understood that in addition to the first pigment, the lower coating layer may also include a first matrix resin, and the first pigment can be dispersed in the first matrix resin. According to some specific embodiments of the present application, the first matrix resin can include at least one of polyethersulfone and polytetrafluoroethylene. This allows the anti-adhesive coating layer to have good bonding strength with the substrate on which it is provided, and at the same time, has good anti-adhesive performance.

[0048] According to the embodiment of the present application, according to the needs of use, the lower coating layer may include at least one of high temperature resistant resin, a first surfactant, a first pH adjuster and wear-resistant particles. Specifically, the first matrix resin and the high temperature resistant resin have strong binding force, can be well bonded with the substrate on which the non-stick coating layer is provided, and at the same time have good corrosion prevention effect, the high temperature resistant resin may include at least one of polyphenylene sulfide (PPS), polyamide-imide (PAI) and polyetheretherketone (PEEK), the first surfactant may include at least one of nonionic surfactant and anionic surfactant, the first pH adjuster may include at least one of ammonia water, triethylamine and diethanolamine, and the wear-resistant particles include at least one of Al2O3, SiO2 and SiC. The above components make the non-stick coating layer have better use effect, specifically, the first surfactant makes the paint more uniform, easier to store, and reduces the paint surface energy, which is convenient for implementation; the first pH adjuster can improve and stabilize the pH value of the paint, which stabilizes the viscosity of the paint, which is convenient for implementation; and the wear-resistant particles can greatly improve the wear resistance and service life of the non-stick coating layer.

[0049] According to the embodiment of the present application, the thickness of the lower coating layer may be 6-30 μm, specifically 6 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc. Within this thickness range, the anticorrosive and wear-resistant properties of the coating layer are optimal, if the thickness is too thick, the coating layer is prone to cracking and dripping during painting, and if the thickness is too thin, the anticorrosive properties, wear-resistant properties, and masking power of the coating layer are reduced.

[0050] According to the embodiment of the present application, the upper coating layer may include a second pigment. By adding the second pigment to the upper coating layer, the pigment in the upper coating layer can mask the part of the substrate that is not masked by the first pigment in the lower coating layer, and there is a certain difference in the distribution of the pigment during the two coatings, which improves the masking rate of the substrate color tone.

[0051] According to the embodiment of the present application, the color tone of the second pigment in the upper coating layer may be the same as or different from the color tone of the first pigment. Thus, the combination of the first pigment and the second pigment can better improve the yellowing problem of the non-adhesive coating layer and the substrate on which the non-adhesive coating layer is provided, and the non-adhesive coating system can exhibit excellent color tones, improving the appearance of the non-adhesive coating system. Furthermore, by adopting pigments of different colors, the appearance effect of the non-adhesive coating system can be improved, and by adding a second pigment different from the first pigment to the upper coating layer, the overlapping coloring effect of different colors can be utilized to improve the masking of the color tone of the substrate. According to the embodiment of the present application, the second pigment includes a metallic color pigment. Thus, since the second color is metallic, the upper coating layer exhibits metallic luster and has strong masking power, and can effectively improve the effect of yellowing.

[0052] According to the embodiment of the present application, the metallic color pigment is flake-shaped, and the orthogonal projections of at least two flake-shaped pigments in the direction perpendicular to the non-adhesive coating layer overlap each other. This can enhance the metallic luster of the coating layer, avoid the phenomenon of uneven color, and reduce the appearance of the color tone of the unmasked substrate, and further reduce the occurrence of impurity colors and improve the appearance of the product. According to some specific embodiments of the present application, the metallic color pigment may include at least one of silver powder and aluminum powder. In some specific examples, the metallic color pigment may include at least one of silver paste and aluminum silver paste. Here, the main components of the aluminum silver paste are snowflake-shaped aluminum particles and petroleum solvent, and it is in the form of a paste, and its characteristics are that the surface of the aluminum pieces is smooth and flat, the particle size distribution is concentrated, the shape is regular, and it has excellent light reflecting ability, metallic luster, and strong masking ability. Specifically, the smaller the particle size of the aluminum powder and silver powder, the stronger the metallic feeling and the stronger the masking power. In some specific embodiments, the particle size of the silver powder and the aluminum powder is independently 2-70 μm, specifically, for example, 2 μm, 3 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, etc., specifically, it may be 3-20 microns. Within this particle size range, the non-stick fluorine coating layer has a very good effect of preventing yellowing.

[0053] According to the embodiment of the present application, based on the total mass of the upper coating layer, the mass percentage of the second pigment is specifically 1.5-12%, for example, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, etc. Within this content range, the appearance effect of the coating layer is optimal and does not affect other performances of the coating layer, if it is too much, the suspension will be too much, which will affect the non-stickiness and binding force of the coating layer, if it is too little, the masking force will be reduced, the color difference value will be large, and the desired appearance effect will not be obtained.

[0054] According to the embodiment of the present application, the fluororesin in the upper coating layer may include polytetrafluoroethylene (PTFE). PTFE resin mainly plays a role of non-adhesiveness, and can provide the non-adhesive coating layer with good non-adhesive effect. In some specific embodiments, the thickness of the upper coating layer may be 8-20 μm, specifically, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, etc. Within this thickness range, the non-adhesiveness and antiseptic performance of the coating layer are optimal, if the coating layer is too thick, it will crack, and if it is too thin, the non-adhesiveness will be reduced.

[0055] According to the embodiment of the present application, the upper coating layer may further include at least one of a second surfactant and a second pH adjuster according to the needs of use. Specifically, the second surfactant may include at least one of a nonionic surfactant and an anionic surfactant, and the second pH adjuster may include at least one of ammonia water, triethylamine, and diethanolamine. Here, the second surfactant can reduce the surface energy of the paint, which is advantageous for implementation, and promote the stable performance of the paint, which is advantageous for storage, and the second pH adjuster can stabilize the pH value of the paint.

[0056] According to some specific embodiments of the present application, the first matrix resin is a mixture of polyethersulfone and polytetrafluoroethylene, the white pigment is titanium oxide, the second matrix resin is polytetrafluoroethylene, and the metallic pigment is silver paste or aluminum silver paste, so that the combination and cooperation of different matrix resins and pigments provides the non-stick coating layer with better masking ability and better yellowing prevention effect.

[0057] According to the embodiment of the present application, the upper coating layer may mask the entire surface of the lower coating layer, or may mask only a part of the surface of the lower coating layer. When the upper coating layer masks the entire surface of the lower coating layer, the non-adhesive coating layer exhibits the color tone of the second pigment or a color tone between the first pigment and the second pigment (i.e., the non-adhesive coating layer exhibits the overlapping effect of the color of the first pigment and the color of the second pigment), and when the upper coating layer masks a part of the surface of the lower coating layer, the color tone exhibited by the non-adhesive coating layer is approximately the same as the color tone of the substrate. This maintains the consistency of the color tone of the outer surface of the product, and improves the consistency and beauty of the appearance.

[0058] According to the embodiment of the present application, the color difference value ΔE between the color tone of the non-adhesive coating layer and the color tone of the substrate based on the color tone of the substrate may be 2-8, for example, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, and specifically, 2.5-6, thereby reducing the color difference between the non-adhesive coating layer and a specific material and improving the consistency of the overall appearance.

[0059] In another aspect of the present application, the present application provides a non-adhesive paint set. According to an embodiment of the present application, the non-adhesive paint set includes an undercoat, the color tone of which is suitable for masking the color tone of a substrate, and an overcoat containing a fluororesin. In the paint set, by adding a material suitable for masking the color tone of a substrate to the undercoat, the yellowing of the substrate on which a coating layer made of the non-adhesive paint set is provided can be masked, and the yellowing of the coating layer itself can also be avoided.

[0060] According to some embodiments of the present application, the undercoat contains 30-50 parts by weight of a first matrix resin dispersion, 10-30 parts by weight of a high temperature resistant resin, 20-50 parts by weight of a first solvent, 1-12 parts by weight of the first pigment, 0-10 parts by weight of a first surfactant, 0-50 parts by weight of deionized water, 0-1 part by weight of a first pH adjuster, and 0-3 parts by weight of abrasion resistant particles. Specifically, the above components and content ranges provide optimal antiseptic performance, abrasion resistance, and masking power of the coating layer.

[0061] According to an embodiment of the present application, the top coating may contain 45-70 parts by weight of fluorine-based resin emulsion, 3-20 parts by weight of second solvent, 0.5-5 parts by weight of the second pigment, 0-10 parts by weight of second surfactant, 10-50 parts by weight of deionized water, and 0-1 part by weight of second pH adjuster. Specifically, the above components and content ranges provide optimal antiseptic performance, non-stick performance, and color effect of the coating layer.

[0062] According to the embodiment of the present application, the non-stick paint set is used to form the above-mentioned non-stick coating layer, where the bottom paint is used to form the lower coating layer, and the top paint is used to form the upper coating layer. Specifically, each component in the non-stick paint set is the same as the corresponding component in the non-stick coating layer, and will not be described here again.

[0063] According to the embodiment of the present application, the first solvent and the second solvent mainly serve to dissolve the resin, and specifically, the first solvent and the second solvent may each independently include at least one of N-methylpyrrolidone (NMP), ethanol, isopropyl alcohol, propylene glycol, glycerol, toluene, xylene, and diethylene glycol diethyl ether, thereby achieving excellent dissolving effect and low cost.

[0064] In a further aspect, the present application provides a method for producing such a non-stick coating layer. According to an embodiment of the present application, the method includes the steps of: stirring and mixing a first solvent, a first surfactant, deionized water, and a first pH adjuster to obtain a first mixture; adding a first matrix resin dispersion and a temperature-resistant resin to the first mixture and stirring uniformly to obtain a second mixture; adding a first pigment and abrasion-resistant particles to the second mixture to obtain an undercoat; stirring and mixing a second solvent, a second surfactant, deionized water, and a second pH adjuster to obtain a third mixture; adding a fluororesin emulsion to the third mixture and stirring uniformly to obtain a fourth mixture; adding a second pigment to the fourth mixture to obtain an overcoat; applying the undercoat by compressed air spraying and performing a first bake curing to obtain a lower coating layer; and applying the top coat on the surface of the lower coating layer by compressed air spraying and performing a second bake curing to obtain an upper coating layer. The method is simple and convenient to operate, has no strict requirements on equipment and technicians, is easy to realize industrial production, and has low cost and good economic efficiency.

[0065] In some specific embodiments, the method may include the steps of: adding a first solvent, a first surfactant, deionized water, and a first pH adjuster in a suitable ratio into a stirring vessel, stirring and mixing; adding a PES dispersion and a temperature-resistant resin, stirring uniformly, and then adding titanium dioxide and wear-resistant particles to prepare a bottom coating; then applying the bottom coating to a rough and clean metal substrate surface by compressed air spraying, and then properly baking and hardening cooling to obtain a bottom coating layer having a thickness of 6 to 30 microns; adding a second solvent, a second surfactant, deionized water, and a second pH adjuster in a suitable ratio into a stirring vessel, stirring and mixing; adding a PTFE emulsion, stirring uniformly, and then adding an aluminum silver paste or silver paste to prepare a top coating; then applying the bottom coating to a surface of the bottom coating layer by compressed air spraying, and then properly baking and hardening cooling to obtain a top coating layer having a thickness of 8 to 20 microns.

[0066] In a further aspect of the present application, the present application provides a cookware. According to an embodiment of the present application, referring to Fig. 2 and Fig. 3, the cookware includes a metal substrate 100 and a non-stick coating layer 200 provided on the surface of the metal substrate 100, the non-stick coating layer 200 being the above-mentioned non-stick coating layer or being the non-stick coating layer 200 made of the above-mentioned non-stick paint set. Specifically, the non-stick coating layer 200 may include a lower coating layer 10 and an upper coating layer 20. The cookware has good non-stick performance and does not yellow after high temperature.

[0067] The specific type of cooking utensil is not particularly limited and may be any cooking utensil, including, for example, pots (stir-fry pans, soup pots, stew pots, milk pots, frying pans, etc.), inner pots of rice cookers, inner pots of pressure cookers, etc., but is not limited to these and will not be described repeatedly here.

[0068] According to some embodiments of the present application, the color tone of at least a part of the cookware in the initial state is the same as the color tone of the part of the cookware in the heated state. According to other embodiments of the present application, the color difference value ΔE between the color tone of at least a part of the cookware in the initial state and the color tone of the part of the cookware in the heated state is less than 4, preferably, ΔE is less than 2, specifically, ΔE may be 3.5, 3, 2.5, 2, 1.5, 1, 0.5, 0.2, 0, etc., so that the appearance of the cookware is consistent.

[0069] According to an embodiment of the present application, the metal substrate may include stainless steel. Specifically, since stainless steel is prone to yellowing after high temperatures, the stainless steel substrate may be used in combination with the non-adhesive coating layer or non-adhesive paint to effectively alleviate the problem of yellowing of the metal substrate and the coating layer itself.

[0070] According to some embodiments of the present application, referring to FIG. 2, the surface of the metal substrate 100 may be flat, and the non-stick coating layer 200 is provided on the flat surface. This provides excellent non-stick performance. In some other embodiments, referring to FIG. 3, the surface of the metal substrate 100 has a plurality of recesses 310 spaced apart from each other, and a protruding surface 320 is provided between the recesses 310, and the non-stick coating layer 200 is provided on the inner wall of the recesses 310. Specifically, the adhesion of the non-stick coating layer can be improved and the scratch resistance of the non-stick coating layer can be reduced, so that external forces are less likely to contact the non-stick coating layer in the recesses, and the adhesion of the non-stick coating layer in the recesses can be improved, and long-term non-stick performance, better wear resistance, and durability can be maintained.

[0071] According to an embodiment of the present application, referring to FIG. 3, in each of the recesses 310, the surface 201 of the non-stick coating layer 200 away from the metal substrate 100 is a curved surface with a center protruding toward the metal substrate 100, and the surface of the non-stick coating layer 200 away from the metal substrate 100 is lower than the protruding surface 320. This reduces the probability that the coating layer is scraped off, improves the adhesion of the coating layer to the recesses, and also forms an air layer between the top of the coating layer and the protruding surface, improving the non-stick performance for food. Furthermore, a hot air layer can be formed above the coating layer during heating, so that the heat received by the food is uniform.

[0072] According to an embodiment of the present application, referring to Fig. 3, the inner wall surface of the recess 310 is a continuous arc surface, and the thickness H1 of the bottom of the non-adhesive coating layer 200 in each recess 310 is greater than the thickness H2 of the side wall of the non-adhesive coating layer 200. As a result, since the inner wall surface of the recess is a continuous arc surface, the deposition of the coating layer at the bottom of the recess is reduced, the flow of the coating layer to the bottom of the recess is promoted, and the deposition of heat in the coating layer of the recess is reduced, thereby avoiding the occurrence of thermal cracks and the deterioration of the corrosion resistance of the portion. The thickness of the bottom of the coating layer is greater than the thickness of the side wall of the coating layer, which can enhance the heat transfer ability of the bottom of the coating layer and improve the heat transfer performance of the entire coating layer.

[0073] 3, in each of the recesses 310, the thickness of the non-stick coating layer 200 gradually increases in a direction from the top to the bottom of the recess 310. This can increase the heat transfer ability of the bottom of the coating layer and improve the heat transfer performance of the entire coating layer.

[0074] 3, according to an embodiment of the present application, the non-adhesive coating layer 200 is configured to have a continuous arc surface, and the lower coating layer 10 and the upper coating layer 20 in the non-adhesive coating layer are both configured to have a continuous arc surface, thereby avoiding the accumulation of energy in the coating layer, thereby reducing the formation of thermal corrosion and improving the corrosion resistance of the coating layer.

[0075] According to an embodiment of the present application, the color of the non-stick coating layer is substantially the same as the color of the raised surface, thereby maintaining the consistency and aesthetics of the appearance of the cookware.

[0076] The embodiments of the present invention will be described in detail below.

[0077] In the following examples, the method for producing the non-adhesive coating layer is as follows.

[0078] Add the first solvent, the first surfactant, the deionized water, and the first pH adjuster in an appropriate ratio into a stirring container and stir to mix, add the first matrix resin dispersion and the heat-resistant resin, and after uniform stirring, add the first pigment and the wear-resistant particles to prepare a base coating, which is applied to the surface of a rough and clean stainless steel metal substrate by compressed air spraying, and then properly baked, hardened, and cooled to obtain a bottom coating layer.

[0079] Add the second solvent, the second surfactant, the deionized water, and the second pH adjuster in an appropriate ratio into a stirring container and stir to mix, add the second matrix resin emulsion and stir evenly, then add the second pigment (if the second pigment is not included, this step is omitted), prepare the top coating, and apply it to the surface of the lower coating layer by compressed air spray method, and properly bake, harden, and cool to obtain the upper coating layer.

[0080] Example 1 The lower coating layer contained 30 parts by weight of PES, 30 parts by weight of PPS, 35 parts by weight of NMP, 15 parts by weight of titanium oxide, the particle size of the titanium oxide being 10 microns, 25 parts by weight of deionized water, 0.5 parts by weight of ammonia water, and 3 parts by weight of Al2O3, the thickness of the formed lower coating layer was 6 microns, and the mass percentage of the titanium oxide in the lower coating layer was 10%.

[0081] The top coating layer contains 50 parts by weight of PTFE, 5 parts by weight of NMP, 10 parts by weight of nonionic surfactant, and 25 parts by weight of deionized water, and the thickness of the top coating layer formed is 8 microns.

[0082] Comparative Example 1 The PTFE coating layer is made of stainless steel as a matrix, and the thickness of the PTFE coating layer is 14 microns.

[0083] Example 2 The bottom coating layer is the same as in Example 1. The upper coating layer contained 60 parts by weight of PTFE, 7 parts by weight of NMP, 1.2 parts by weight of aluminum powder (particle size 3 microns), 5 parts by weight of a nonionic surfactant, and 40 parts by weight of deionized water. The thickness of the upper coating layer formed was 8 microns, and the mass percentage of the aluminum powder in the upper coating layer was 3%.

[0084] Example 3 The amount of titanium oxide used in the lower coating layer was 40 parts by weight, which is the same as in Example 2, but the mass percentage of titanium oxide in the lower coating layer was 27%.

[0085] Example 4 The amount of titanium oxide used in the lower coating layer is 6 parts by weight, which is the same as in Example 2, but the mass percentage of titanium oxide in the lower coating layer is 4%.

[0086] Example 5 The amount of titanium oxide used in the lower coating layer is 60 parts by weight, which is the same as in Example 2, but the mass percentage of titanium oxide in the lower coating layer is 45%.

[0087] Example 6 Same as Example 2, except that the particle size of titanium oxide in the lower coating layer is 40 microns.

[0088] Example 7 Same as Example 2, except that the thickness of the bottom coating layer is 30 microns.

[0089] Example 8 Same as Example 2, except that the thickness of the bottom coating layer is 40 microns.

[0090] Example 9 Same as Example 2, except that the thickness of the bottom coating layer is 4 microns.

[0091] Example 10 The amount of aluminum powder used in the upper coating layer is 1 part by weight, which is the same as in Example 2, but the mass percentage of aluminum powder in the upper coating layer is 2%.

[0092] Example 11 The amount of aluminum powder used in the upper coating layer is 2 parts by weight, which is the same as in Example 2, but the mass percentage of aluminum powder in the upper coating layer is 5%.

[0093] Example 12 The amount of aluminum powder used in the upper coating layer is 0.5 parts by weight, which is the same as in Example 2, but the mass percentage of aluminum powder in the upper coating layer is 1%.

[0094] Example 13 The amount of aluminum powder used in the upper coating layer is 8 parts by weight, which is the same as in Example 2, but the mass percentage of aluminum powder in the upper coating layer is 20%.

[0095] Example 14 Same as Example 2, except that the thickness of the top coating layer is 20 microns.

[0096] Example 15 Same as Example 2, except that the thickness of the top coating layer is 5 microns.

[0097] Example 16 Same as Example 2, except that the thickness of the top coating layer is 30 microns.

[0098] Example 17 This is the same as Example 2, except that the particle size of the aluminum powder is 20 microns.

[0099] Example 18 Same as Example 1, except that titanium oxide in the lower coating layer was replaced with 15 parts by weight of zinc oxide.

[0100] Example 19 Same as Example 1, except that the titanium oxide in the lower coating layer was replaced with 15 parts by weight of alumina.

[0101] Example 20 Same as Example 2, except that titanium oxide in the lower coating layer was replaced with 15 parts by weight of zinc oxide.

[0102] Example 21 Same as Example 2, except that the titanium oxide in the lower coating layer was replaced with 15 parts by weight of alumina.

[0103] Example 22 Same as Example 2, except that the aluminum powder in the upper coating layer was replaced with 1.2 parts by weight of silver powder.

[0104] Performance Detection 1. The adhesion test method and evaluation criteria are as follows (100 grid test): Test method: Use a 100-grid knife to draw 10x10 (100 pieces) 1mmx1mm small grids on the surface of the test sample, each scribing line should be deep enough to reach the lower coating layer of the non-adhesive coating layer, clean the debris in the test area with a brush, firmly paste the small grids to be tested with 3M600# adhesive paper or adhesive paper of equivalent effect, vigorously wipe the tape with an eraser to increase the contact area and strength between the tape and the test area, and after standing for 3-5 minutes, grab one end of the tape with your hand and quickly peel off the adhesive paper vertically (90° / 60°), and perform two identical tests at the same position. Adhesion criteria: Level 0: The cutting edge is completely smooth and there is no peeled grid. Level 1: There is a small amount of coating loss at the intersection of the cut edges, but no more than 5% of the intersection cut area is affected. Level 2: There is coating delamination at the intersection of the cuts or at the cut edges, with the affected intersection cut area clearly greater than 5% but not clearly greater than 15%. Level 3: Part or all of the coating layer is flaked off in large pieces along the cut edge and / or part or all of the coating layer is flaked off at different parts of the lattice, with the affected cross-cut area being clearly greater than 15% but not clearly greater than 35%. Level 4: Along the cut edge the coating layer is detached in large pieces and / or some grids are detached in part or in whole, the affected cross-cut area is clearly greater than 35% but not clearly greater than 65%. Level 5: The degree of peeling exceeds level 4.

[0105] 2. The non-stick test methods and standards are as follows:

[0106] Test method: 1. Put an appropriate amount of vegetable oil into the cookware, then wipe the non-stick surface with a soft cloth until it is evenly coated; 2. Wash with warm water above 60℃ and neutral detergent, then rinse with clean water, wipe and dry. 3. Place the cookware in an electric furnace with a rated voltage of 220V and an output of 1kW to heat it, and use a surface thermometer with an accuracy of 2.5 level or higher to measure. When the surface temperature of the non-stick coating layer reaches 150℃~170℃, crack a fresh egg weighing 50g~60g and place it into the cookware until the protein is almost coagulated (during the entire cooking process, the surface temperature of the non-stick coating layer should not exceed 210℃); Non-stickiness criteria: A plastic blade with a cutting edge thickness of 0.2mm to 0.5mm must be used to remove eggs without damage and without leaving any residue. If 10 or more consecutive fried eggs are removed without damage and without leaving any residue, the non-stickiness is level 1; if 5 consecutive fried eggs are removed without damage and without leaving any residue, the non-stickiness is level 2; if 1 consecutive fried egg is removed without damage and without leaving any residue, the non-stickiness is level 3; if the egg cannot be removed completely but no residue is left, the non-stickiness is level 4; if the egg cannot be removed completely but some residue is left, the non-stickiness is level 5.

[0107] 3, Color difference detection: Specific test method: Measure the color difference with a color difference tester, and use the stainless steel metal substrate (unheated) as the standard, and set the color difference ΔE=0 (the smaller the ΔE value, the smaller the color difference). The color difference value between the stainless steel metal substrate after heating at 350℃ and the stainless steel metal substrate before heating is ΔE=32.76.

[0108] The performance test results for each of the Examples and Comparative Examples are shown in Table 1 below.

[0109] [Table 1] TIFF0007656029000002.tif82170

[0110] Specifically, the color difference value between the non-heated sample and the reference matrix mainly reflects the color of the non-adhesive coating layer itself. The smaller the change in the color difference value between the sample and the reference matrix before and after heating (including the case where it becomes larger or smaller), the better the yellowing resistance and masking power of the non-adhesive coating layer. Based on this, as can be seen from the above data, 1. The masking effect is better when both the lower and upper coating layers contain pigment than when only the lower coating layer contains pigment. 2. As the pigment content in the lower coating layer increases, the masking power is relatively better, but the binding power is weaker; as the pigment content in the lower coating layer decreases, the masking power is weaker. 3. As the thickness of the lower coating layer increases, it is more likely to crack, and as the thickness of the lower coating layer decreases, the masking power decreases. 4. With increasing pigment content in the upper coating layer, the masking power gradually improves and then gradually decreases. The higher the content, the more the suspension and the less the non-stickiness. 5. As the particle size of the pigment in the top coating layer increases, the masking power decreases. 7. As the thickness of the upper coating layer increases or decreases, the non-adhesiveness decreases, the thickness increases, and the probability of cracking increases.

[0111] As described above, when a material with an appropriate content and particle size suitable for masking the color tone of the substrate is added to the lower coating layer to form a lower coating layer with an appropriate thickness, the non-stick coating layer can effectively solve the high-temperature yellowing problem of the non-stick coating layer and the substrate without changing the performance of the non-stick coating layer, and the color difference of the sample after high-temperature heating (350°C) is small, thereby meeting the demands of cookware.

[0112] In the present description, it is to be understood that the terms "first", "second", etc. are for descriptive purposes only and cannot be considered to indicate or imply relative importance or to imply a number of technical features. Thus, a feature qualifying as "first" or "second" may expressly or imply the inclusion of one or more of the feature. In the present description, unless otherwise expressly and specifically limited, "plurality" means two or more than two.

[0113] In the description of this specification, a description referring to the terms "one embodiment", "several embodiments", "examples", "specific examples" or "several examples" means combining specific features, structures, materials or characteristics included in at least one embodiment or example of the present application described in the embodiment or example. The above terms in this specification do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be combined as appropriate in any one or more embodiments or examples. Unless mutually inconsistent, a person skilled in the art may combine and combine different embodiments or examples described in this specification with features of different embodiments or examples.

[0114] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and should not be construed as limiting the present application, and that those skilled in the art may change, modify, substitute, and alter the above embodiments within the scope of the present application.

Claims

1. A non-stick coating layer, a bottom coating layer having at least one material color suitable for masking the color of the substrate; an upper coating layer provided on a surface of the lower coating layer opposite to the substrate and including a fluorine-based resin; The lower coating layer includes a first pigment, and a color difference value between a color tone of the first pigment and the white tone is 0-30 based on a white tone, and a mass percentage of the first pigment is 5-40% based on a total mass of the lower coating layer; The upper coating layer includes a second pigment, the second pigment includes a metallic pigment, the metallic pigment has a flake shape, and orthogonal projections of at least two flake-shaped pigments in a direction perpendicular to the non-adhesive coating layer overlap each other, and the mass percentage of the second pigment is 1.5 to 12% based on the total mass of the upper coating layer; a color difference value between the color tone of the non-adhesive coating layer and the color tone of the substrate based on the color tone of the unheated substrate is ΔE=2-8; The non-stick coating layer is used to provide a surface of a metal substrate of a cooking utensil, the substrate being a metal substrate; A non-stick coating layer in which the color tone of at least a portion of the cooking utensil in an initial state is the same as the color tone of the cooking utensil in a heated state during cooking, or the color difference value ΔE between the color tone of at least a portion of the cooking utensil in the initial state and the color tone of the heated state is less than 4.

2. 2. The non-adhesive coating layer according to claim 1, wherein the color difference value between the color tone of the non-adhesive coating layer and the color tone of the substrate is ΔE=2.5-6, based on the color tone of the unheated substrate.

3. The undercoating layer includes a first matrix resin and the first pigment dispersed in the first matrix resin, and the undercoating layer includes The first pigment includes a white pigment, and the white pigment includes at least one of titanium, a titanium compound, zinc oxide, alumina, and mica; the particle size of the first pigment is 5-25 microns; The first matrix resin contains at least one of polyethersulfone and polytetrafluoroethylene; The thickness of the lower coating layer is 6-30 μm; and b. the weight percentage of the first pigment is 10-27%, based on the total weight of the lower coating layer; The upper coating layer includes the fluororesin and the second pigment dispersed in the fluororesin, and the upper coating layer comprises: The second pigment contains at least one of silver powder and aluminum powder; The fluororesin contains polytetrafluoroethylene; The anti-stick coating layer according to claim 1, wherein the thickness of the upper coating layer is 8-20 μm.

4. A non-adhesive paint set used for forming the non-adhesive coating layer according to any one of claims 1 to 3, comprising: a base coat used to form the lower coating layer, the color tone of at least one material being suitable for masking the color tone of the substrate; A top coating material used to form the top coating layer, the top coating material including a fluorine-based resin; The undercoat is 30 to 50 parts by weight of a first matrix resin dispersion, High temperature resistant resin 10-30 parts by weight, First solvent: 20 to 50 parts by weight, First pigment: 1 to 12 parts by weight, 0 to 10 parts by weight of a first surfactant, Deionized water 0 to 50 parts by weight, 0 to 1 part by weight of a first pH adjuster, 0 to 3 parts by weight of wear-resistant particles; The top coating is Fluorine-based resin emulsion: 45 to 70 parts by weight, 3 to 20 parts by weight of a second solvent, 0.5 to 5 parts by weight of a second pigment, 0 to 10 parts by weight of a second surfactant, Deionized water 10 to 50 parts by weight, A non-stick paint set comprising: 0 to 1 part by weight of a second pH adjuster.

5. A cooking utensil, A metal substrate; A cooking utensil comprising: a non-stick coating layer formed on a surface of the metal substrate, the non-stick coating layer being made of the non-stick paint set according to any one of claims 1 to 3 or claim 4.

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