CN115177156A - Cooking utensil and preparation method thereof - Google Patents

Abstract

The application relates to a cooking utensil and a preparation method thereof, the cooking utensil comprises a pot body, at least part of the surface of the pot body is provided with a non-stick coating, the non-stick coating comprises a composite non-stick coating, the composite non-stick coating comprises a fluorine-containing polymer and a coating layer coated on the surface of the fluorine-containing polymer, and the material of the coating layer comprises a conductive metal. The composite non-stick coating comprises a fluorine-containing polymer and a conductive metal coating layer coated on the surface of the fluorine-containing polymer, wherein the non-stick performance of the non-stick coating can be improved due to the presence of the fluorine-containing polymer, and the non-stick coating has certain high-temperature resistance and low-temperature resistance; the conductive metal has stronger hardness, lower friction coefficient, higher heat transfer effect and excellent corrosion resistance, and is coated on the surface of the fluoropolymer to be used as a non-stick coating of the pot body, so that the non-stick coating has high hardness, good wear resistance and excellent non-stick performance, thereby improving the performance stability of the cooking utensil.

Description

Cooking utensil and preparation method thereof

Technical Field

The invention relates to the technical field of appliances, in particular to a cooking appliance and a preparation method thereof.

Background

In the cookware industry, stainless steel is used in large quantities with a hard texture, wear resistance and stable surface properties. However, the stainless steel surface has no food inadhesion (such as inadhesion of eggs) and poor high-temperature discoloration resistance (high-temperature oxidative discoloration is easy), when the temperature exceeds 250 ℃, the surface begins to yellow, and the yellowing is more serious at higher temperature. These all affect the appearance and customer experience of the product.

In the prior art, in order to achieve non-stick property of food in cooking appliances, chemical paint is generally sprayed on the surface of a substrate. However, the existing chemical film layer is mainly made of fluorocarbon resin and siloxane sol polycondensate, and after the existing chemical film layer is coated on the inner surface of a pot body to form a non-stick coating, the problems of low film layer hardness (2H-8H) and poor wear resistance exist.

Therefore, there is an urgent need for a cooking appliance that combines durability, non-stick property, abrasion resistance and hardness.

Disclosure of Invention

In order to overcome the defects, the application provides the cooking appliance and the preparation method thereof, the cooking appliance has the advantages of oil storage non-adhesiveness, wear resistance and high hardness, and the comprehensive performance of the cooking appliance can be improved.

In a first aspect, an embodiment of the present application provides a cooking utensil, the cooking utensil includes the pot body, at least partial surface of the pot body is equipped with non-stick coating, non-stick coating includes compound non-stick coating, compound non-stick coating includes fluoropolymer and covers and establish the coating on fluoropolymer surface, the material of coating includes conductive metal.

In the technical scheme, the composite non-stick coating comprises a fluorine-containing polymer and a conductive metal coating layer coated on the surface of the fluorine-containing polymer, wherein the fluorine-containing polymer can improve the non-stick performance of the non-stick coating and has certain high temperature resistance and low temperature resistance; the conductive metal has stronger hardness, lower friction coefficient, higher heat transfer effect and excellent corrosion resistance, and is coated on the surface of the fluoropolymer to be used as the non-stick coating of the pot body together with the fluoropolymer, so that the non-stick coating has high hardness, good wear resistance and excellent non-stick performance, thereby improving the performance stability of the cooking utensil.

In some embodiments, the volume ratio of fluoropolymer to cladding is (5 to 10): 1.

in some embodiments, the particle size of the fluoropolymer is between 3 μm and 70 μm.

In some embodiments, the fluoropolymer having a particle size of 50 to 70 μm is present in an amount of 50 to 65% by volume of the total fluoropolymer.

In some embodiments, the fluoropolymer having a particle size of 20 to 50 μm is present in an amount of 25 to 30% by volume of the total fluoropolymer.

In some embodiments, the fluoropolymer having a particle size of 3 μm to 20 μm is present in an amount of 10% to 20% by volume of the total fluoropolymer.

In some embodiments, the fluoropolymer comprises at least one of polytetrafluoroethylene, ammonium perfluorooctanoate, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a polyfluoroethylene propylene copolymer, and an ethylene-tetrafluoroethylene copolymer.

In some embodiments, the material of the conductive metal comprises at least one of aluminum, stainless steel, and iron.

In some embodiments, the material of the pan body comprises at least one of aluminum alloy, aluminum, stainless steel, iron, and low carbon steel.

In some embodiments, the material of the pan body is the same as the material of the conductive metal wire.

In some embodiments, the composite non-stick coating has a particle size of 3 μm to 70 μm.

In some embodiments, the non-stick coating has a thickness of 100 μm to 200 μm.

In some embodiments, the hardness of the cooking appliance is 100HV to 200HV.

In some embodiments, the cooking utensil has a surface porosity of 3% to 15%.

In some embodiments, the cooking utensil has an inner surface roughness of 5 μm to 12 μm.

In a second aspect, embodiments of the present application provide a method for preparing a cooking appliance, including the following steps:

providing a conductive metal strip, winding the conductive metal strip into a cylindrical shape, performing wire-rotating treatment on the cylindrical conductive metal strip to form a tubular wire or a similar tubular wire, and injecting polyfluorinated compound powder in the process of wire-rotating treatment to obtain a composite non-stick coating, wherein the composite non-stick coating comprises a fluorine-containing polymer and a coating layer coated on the surface of the fluorine-containing polymer, and the coating layer is a conductive metal wire;

forming a base material into a pot body with a cooking cavity through stretching;

and coating the composite non-stick coating on the inner surface of the pot body, and carrying out heat treatment on the inner surface of the pot body to obtain the cooking utensil.

In the technical scheme, polyfluoride compound powder is injected in the process of wire-rotating treatment of the metal strip, so that the metal strip is converted into a tubular body or a similar tubular body, polyfluoride compound powder is distributed in the tubular body or the similar tubular body, and then composite non-stick paint is obtained, wherein the composite non-stick paint comprises a fluorine-containing polymer and a coating layer coated on the surface of the fluorine-containing polymer, the coating layer is a conductive metal wire, the composite non-stick paint is coated on the inner surface of a pot-carrying body, and a cooking utensil is obtained through heat treatment; on the other hand, the hardness, corrosion resistance and wear resistance of the non-stick coating can be improved through heat treatment, the preparation method is simple in process, and the prepared cooking utensil has good non-stick performance and excellent hardness and wear resistance, so that the performance stability of the cooking utensil is improved.

In some embodiments, the fluoropolymer comprises at least one of polytetrafluoroethylene, ammonium perfluorooctanoate, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, and a polyperfluoroethylene propylene copolymer and an ethylene-tetrafluoroethylene copolymer.

In some embodiments, the conductive metal strip comprises at least one of an aluminum strip, a stainless steel strip, and an iron strip.

In some embodiments, the volume ratio of the fluoropolymer to the cladding layer is (5 to 10): 1.

in some embodiments, the particle size of the fluoropolymer is between 3 μm and 70 μm.

In some embodiments, the fluoropolymer has a particle size of 3 to 70 μm, and the volume fraction of the fluoropolymer having a particle size of 50 to 70 μm in the total fluoropolymer is 50 to 65%.

In some embodiments, the fluoropolymer has a particle size of 3 to 70 μm, and the volume fraction of the fluoropolymer having a particle size of 20 to 50 μm in the total fluoropolymer is 25 to 30%.

In some embodiments, the fluoropolymer has a particle size of 3 to 70 μm, and the volume of the fluoropolymer having a particle size of 3 to 20 μm is 10 to 20% of the total fluoropolymer.

In some embodiments, the material of the pan body comprises at least one of aluminum alloy, aluminum, stainless steel, iron, and low carbon steel.

In some embodiments, the wire has a diameter of 0.8mm to 2.0mm.

In some embodiments, the temperature of the heat treatment is 380 ℃ to 400 ℃.

In some embodiments, the heat treatment time is 5min to 10min.

In some embodiments, the heat treatment is performed in an inert gas atmosphere.

The technical scheme of the application has at least the following beneficial effects: the composite non-stick coating comprises a fluorine-containing polymer and a conductive metal coating layer coated on the surface of the fluorine-containing polymer, wherein the non-stick performance of the non-stick coating can be improved due to the presence of the fluorine-containing polymer, and the non-stick coating has certain high temperature resistance and low temperature resistance; the conductive metal has stronger hardness, lower friction coefficient, higher heat transfer effect and excellent corrosion resistance, and is coated on the surface of the fluoropolymer to be used as a non-stick coating of the pot body together with the fluoropolymer, so that the non-stick coating has high hardness, good wear resistance and excellent non-stick performance, thereby improving the performance stability of the cooking utensil.

Drawings

The invention is further illustrated by the following examples in conjunction with the drawings.

Fig. 1 is a flow chart of the preparation of the cooking appliance of the present application.

Detailed Description

In order to better understand the technical scheme of the invention, the following detailed description of the embodiments of the invention is made with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The embodiment of the application provides a cooking utensil, and cooking utensil includes the pot body, and at least partial surface of the pot body is equipped with the non-stick coating, and the non-stick coating includes compound non-stick coating, and compound non-stick coating includes fluoropolymer and covers the coating of establishing on fluoropolymer surface, and the material of coating includes conductive metal.

In the technical scheme, the composite non-stick coating is of a core-shell structure, and specifically comprises a fluorine-containing polymer and a conductive metal coating layer coated on the surface of the fluorine-containing polymer, and the presence of the fluorine-containing polymer can improve the non-stick performance of the non-stick coating and has certain high-temperature resistance and low-temperature resistance; the conductive metal has stronger hardness, lower friction coefficient, higher heat transfer effect and excellent corrosion resistance, and is coated on the surface of the fluoropolymer to be used as the non-stick coating of the pot body together with the fluoropolymer, so that the non-stick coating has high hardness, good wear resistance and excellent non-stick performance, thereby improving the performance stability of the cooking utensil.

In the application, fluorine atoms exist in the fluorine-containing polymer, and have low polarity, smooth surface property, non-adhesiveness and smoothness; further, the fluoropolymer is also excellent in properties such as heat resistance, chemical resistance, and resistance to photochemical degradation due to the specific property constants of fluorine atoms and the helical structure of the three-dimensional arrangement of fluorine atoms. The conductive metal has higher heat transfer coefficient, hardness and corrosion resistance, and the application of the conductive metal to the non-stick coating can effectively improve the use effect and the service life of the cooking utensil. This application is through combining fluoropolymer and conductive metal as the raw materials of non-stick coating together, and conductive metal is in cooking utensil's surface, can make cooking utensil possess the advantage of oil storage non-adhesion, wearability and high rigidity simultaneously.

In some embodiments, the volume ratio of fluoropolymer to cladding is (5 to 10): specifically, the volume ratio of fluoropolymer to cladding layer may be 5: 1. 6: 1. 7: 1. 8: 1. 9:1 and 10:1, etc., may be other values within the above range, and is not limited herein. If the volume ratio of the fluoropolymer to the clad is less than 5:1, excessive metal components can be caused, and the non-adhesiveness of the product is influenced; if the volume ratio of fluoropolymer to cladding is greater than 10:1, the polymer content is too high, so that the conductive metal wire is too soft and is not easy to process, and the hardness of the product is influenced.

In some embodiments, the particle size of the fluoropolymer is 3 μm to 70 μm, and specifically, the particle size of the fluoropolymer may be 3 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, or the like, or may be other values within the above range, which is not limited herein. If the particle size of the fluorine-containing polymer is larger than 70 mu m, the particle size and the gap of the powder are large, the density of the formed non-stick coating is not high, the heat treatment temperature is high or long in the preparation process of a cooking utensil, and the decomposition of the fluorine-containing polymer with small particle size is caused and the performance is reduced if the heat treatment temperature is too high or too long; if the particle size of the fluorine-containing polymer is less than 3 mu m, more fine powder in the non-stick coating is caused, and the hardness of the composite non-stick coating as a non-stick coating is reduced.

In some embodiments, the volume ratio of the fluoropolymer having a particle size of 50 μm to 70 μm in the total fluoropolymer is 50% to 65%, specifically, the volume ratio of the fluoropolymer having a particle size of 50 μm to 70 μm in the total fluoropolymer may be 50%, 53%, 55%, 58%, 60%, 63%, 65%, etc., and may be other values within the above range, which is not limited herein. The volume ratio of the fluorine-containing polymer with the grain diameter of 50-70 mu m in the total fluorine-containing polymer is controlled within the range, so that the hardness and the non-stick performance of the non-stick coating can be simultaneously improved.

In some embodiments, the volume ratio of the fluoropolymer having a particle size of 20 μm to 50 μm in the total fluoropolymer is 25% to 30%, specifically, the volume ratio of the fluoropolymer having a particle size of 20 μm to 50 μm in the total fluoropolymer may be 25%, 26%, 27%, 28%, 29%, 30%, etc., and may be other values within the above range, which is not limited herein.

In some embodiments, the volume ratio of the fluoropolymer having a particle size of 3 μm to 20 μm in the total fluoropolymer is 10% to 20%, and specifically, the volume ratio of the fluoropolymer having a particle size of 3 μm to 20 μm in the total fluoropolymer may be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, etc., or may be other values within the above range, which is not limited herein.

The volume ratio of the fluorine-containing polymer with the grain diameter of 20-50 mu m in the total fluorine-containing polymer and the volume ratio of the fluorine-containing polymer with the grain diameter of 3-20 mu m in the total fluorine-containing polymer are controlled within the range, so that the powder gap of large-size powder (50-70 mu m) can be filled, a certain powder size gradient can be formed, and the compactness of a film layer of a non-stick coating can be greatly improved.

In some embodiments, the fluoropolymer comprises at least one of polytetrafluoroethylene, ammonium perfluorooctanoate, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a polyperfluoroethylene propylene copolymer, and an ethylene-tetrafluoroethylene copolymer. Illustratively, polytetrafluoroethylene (PTFE) has minimal surface tension and inertness in solid materials, and does not adhere to anything. In addition, polytetrafluoroethylene (PTFE) has the lowest coefficient of friction, excellent self-lubricating properties and excellent high and low temperature resistance, which makes the cooking utensil have excellent anti-sticking properties as a non-stick coating.

In some embodiments, the material of the conductive metal comprises at least one of aluminum, stainless steel, and iron.

In some embodiments, the material of the pan body comprises at least one of aluminum alloy, aluminum, stainless steel, iron, and low carbon steel.

In some embodiments, the material of the pan body is the same as the material of the metal wire. The same material has good compatibility, so that the pan body and the non-stick coating have good interface fusion, the non-stick coating and the pan body are more stably connected, and the non-stick coating and the pan body can play a good stress transfer role and cannot be layered when being subjected to impact energy.

In some embodiments, the particle size of the composite non-stick coating is 3 μm to 70 μm, and specifically, the particle size of the composite non-stick coating may be 33 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, etc., or may be other values within the above range, which is not limited herein.

In some embodiments, the thickness of the non-stick coating is 100 μm to 200 μm, and specifically, the thickness of the non-stick coating may be 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, etc., or may be other values within the above range, which is not limited herein. The thickness of the non-stick coating is more than 200 mu m, so that the binding force of the coating is reduced, the consumption of raw materials is large, and the cost is increased; the thickness of the non-stick coating is less than 100 μm, resulting in poor non-stick performance of the coating.

In some embodiments, the hardness of the cooking appliance is 100HV to 200HV, and specifically, the hardness of the cooking appliance may be 100HV, 110HV, 120HV, 130HV, 140HV, 150HV, 160HV, 170HV, 180HV, 190HV, 200HV, etc., or may be other values within the above range, which is not limited herein.

In some embodiments, the porosity of the cooking utensil is 3% to 15%, specifically, the porosity of the surface of the cooking utensil may be 3%, 5%, 8%, 10%, 12%, 15%, etc., or may be other values within the above range, which is not limited herein. It is understood that the porosity of the material refers to the percentage of the volume of the pores to the total volume of the material, and in the invention, the ratio of the volume of all the pores in the cooking utensil to the total volume of the cooking utensil, the porosity of the cooking utensil of the present application is controlled within the above range, which can improve the corrosion resistance and the non-stick performance of the cooking utensil at the same time, and if the porosity of the cooking utensil is higher than 15%, the strength of the non-stick coating is reduced, the thickness of the cooking utensil is increased, and the performance of the cooking utensil is reduced.

In a second aspect, an embodiment of the present invention provides a method for manufacturing a cooking appliance, as shown in fig. 1, including the following steps:

providing a conductive metal strip, winding the conductive metal strip into a cylindrical shape, carrying out wire rotating treatment on the cylindrical conductive metal strip to form a tubular wire or a similar tubular wire, injecting polyfluorinated compound powder in the process of wire rotating treatment to obtain a composite non-stick coating, wherein the composite non-stick coating comprises a fluoropolymer and a coating layer coated on the surface of the fluoropolymer, and the coating layer is the conductive metal wire;

forming a base material into a pot body with a cooking cavity through stretching;

and coating the composite non-stick coating on the inner surface of the pot body, and carrying out heat treatment on the inner surface of the pot body to obtain the cooking utensil.

In the technical scheme, polyfluoro compound powder is injected in the metal strip wire-rotating process, so that the metal strip is converted into a tubular body or a similar tubular body, polyfluoro compound powder is distributed in the tubular body or the similar tubular body, and composite non-stick paint is obtained; on the other hand, the hardness, the corrosion resistance and the wear resistance of the non-stick coating can be improved through heat treatment, the preparation method is simple in process, and the prepared cooking utensil has good non-stick performance and excellent hardness and wear resistance, so that the performance stability of the cooking utensil is improved.

The technical scheme of the invention is described in detail according to specific steps.

Step S100, providing a conductive metal strip, winding the conductive metal strip into a cylindrical shape, carrying out wire-rotating treatment on the cylindrical metal strip to form a tubular wire or a similar tubular wire, and injecting polyfluoride compound powder in the wire-rotating treatment process to obtain the composite non-stick coating.

In the step, the operation of wire rotating treatment and the operation of injecting the polyfluoro compound are carried out simultaneously, polyfluoro compound powder can be directly filled into the conductive metal wire, and enough polyfluoro compound is ensured to be filled in a tubular wire or a tubular spherical wire formed by conductive metal, so that the composite non-stick coating is obtained, and the non-stick performance of the composite non-stick coating is ensured. Specifically, the composite non-stick coating comprises a fluorine-containing polymer and a coating layer coated on the surface of the fluorine-containing polymer, wherein the coating layer is a conductive metal wire.

In some embodiments, the fluoropolymer comprises at least one of polytetrafluoroethylene, ammonium perfluorooctanoate, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a polyperfluoroethylpropylene copolymer, and an ethylene-tetrafluoroethylene copolymer

In some embodiments, the conductive metal strip comprises at least one of an aluminum strip, a stainless steel strip, and an iron strip.

In some embodiments, the apparatus for the wire winding process comprises at least one of a wire rotating mill, a four-high cold rolling mill, and a square steel rolling die drawing machine.

In some embodiments, the volume ratio of fluoropolymer to cladding is (5 to 10): specifically, the volume ratio of fluoropolymer to cladding layer may be 5: 1. 6: 1. 7: 1. 8: 1. 9:1 and 10:1, etc., may have other values within the above range, and is not limited herein. If the volume ratio of the fluoropolymer to the clad is less than 5:1, excessive metal components can be caused, and the non-adhesiveness of the product is influenced; if the volume ratio of fluoropolymer to cladding is greater than 10:1, the polymer content is too high, so that the conductive metal wire is too soft and is not easy to process, and the hardness of the product is influenced.

In some embodiments, the particle size of the fluoropolymer is 3 μm to 70 μm, and specifically, the particle size of the fluoropolymer may be 3 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, or the like, or may be other values within the above range, which is not limited herein. If the particle size of the fluorine-containing polymer is larger than 70 mu m, the particle size and the gap of the powder are large, and the density of the formed non-stick coating is not high, in the preparation process of the cooking utensil, the heat treatment temperature is high or long, and if the heat treatment temperature is too high or too long, the decomposition of the fluorine-containing polymer with small particle size is caused, and the performance is reduced; if the particle size of the fluorine-containing polymer is less than 3 mu m, more fine powder in the non-stick coating is caused, and the hardness of the composite non-stick coating as a non-stick coating is reduced.

In some embodiments, the volume ratio of the fluoropolymer having a particle size of 50 μm to 70 μm in the total fluoropolymer is 50% to 65%, specifically, the volume ratio of the fluoropolymer having a particle size of 50 μm to 70 μm in the total fluoropolymer may be 50%, 53%, 55%, 58%, 60%, 63%, 65%, etc., and may be other values within the above range, which is not limited herein. The volume ratio of the fluorine-containing polymer with the grain diameter of 50-70 mu m in the total fluorine-containing polymer is controlled within the range, so that the hardness and the non-stick performance of the non-stick coating can be simultaneously improved.

In some embodiments, the volume ratio of the fluoropolymer having a particle size of 20 μm to 50 μm in the total fluoropolymer is 25% to 30%, specifically, the volume ratio of the fluoropolymer having a particle size of 20 μm to 50 μm in the total fluoropolymer may be 25%, 26%, 27%, 28%, 29%, 30%, etc., and may be other values within the above range, which is not limited herein.

In some embodiments, the volume ratio of the fluoropolymer having a particle size of 3 μm to 20 μm in the total fluoropolymer is 10% to 20%, specifically, the volume ratio of the fluoropolymer having a particle size of 3 μm to 20 μm in the total fluoropolymer may be 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, etc., or may be other values within the above range, and is not limited herein.

The volume ratio of the fluorine-containing polymer with the grain diameter of 20-50 mu m in the total fluorine-containing polymer and the volume ratio of the fluorine-containing polymer with the grain diameter of 3-20 mu m in the total fluorine-containing polymer are controlled within the range, so that the powder gap of large-size powder (50-70 mu m) can be filled, a certain powder size gradient can be formed, and the compactness of a film layer of the non-stick coating can be greatly improved.

In some embodiments, the diameter of the conductive metal wire is 0.8mm to 2.0mm, and specifically, the diameter of the conductive metal wire may be 0.8mm, 1.0mm, 1.3mm, 1.5mm, 1.8mm, 2.0mm, etc., or may be other values within the above range, which is not limited herein.

And step S200, stretching and forming the base material to form a pot body with a cooking cavity.

In some embodiments, the material of the substrate includes at least one of aluminum alloy, aluminum, stainless steel, iron, and low carbon steel. . The substrate may be a single layer substrate or a composite substrate, for example, a single layer substrate includes only one substrate; the composite base material is formed by compounding a plurality of materials, for example, the base material is formed by compounding a layer of aluminum and a layer of stainless steel, and then the pot body is formed by stretching. Preferably, the material of the pan body is the same as that of the metal wire material in the composite non-stick coating. The same material has good compatibility, so that the non-stick coating and the pan body have good interface fusion, the non-stick coating and the pan body are connected more stably, the non-stick coating and the pan body can play a good stress transfer role, and the non-stick coating and the pan body can not be layered when being subjected to impact energy.

The pot body containing iron elements or aluminum elements is modified, the overall performance of the cooking utensil prepared by the pot body is improved, preferably, the pot body is made of stainless steel, the stainless steel pot body is made of austenite or ferrite, and the pot body can be made of 304 stainless steel, 430 stainless steel and the like.

In some embodiments, the base material may also be formed into the pan body by other forming processes, which are not limited herein, and for example, the base material may also be formed into the pan body by processes such as spinning, extruding, and cutting.

And S300, coating the composite non-stick coating obtained in the step S100 on the inner surface of the pot body obtained in the step S200 to obtain the cooking utensil.

Step S301, coating the inner surface of the pot carrying body with the composite non-stick coating.

In some embodiments, before step S301, the pot body needs to be subjected to mechanical pretreatment and chemical pretreatment, specifically, the mechanical pretreatment includes oil removal, mechanical sanding, sand blasting, deburring and the like on the surface of the pot body, an oil removal agent can be used for oil removal, specifically, a water-based cleaning agent DX106 can be selected as the oil removal agent, the product has good durability, is not easy to precipitate in high-temperature and high-alkali liquor, has excellent hard water resistance, and has degreasing cleaning power superior to NP and OP surfactants, thereby being suitable for a wide pH range. The shot blasting aims at removing rust and blasting sand, and also aims at removing rust, improving laser heat absorption rate and reducing heat waste caused by laser reflection, and quartz sand, yellow sand, copper slag and the like can be sprayed to the surface of the pot body at a high speed.

In some embodiments, after the mechanical pretreatment and the chemical pretreatment are performed on the pot body, any one of shot blasting treatment, etching treatment and embossing treatment is further performed on the inner surface of the pot body, so that the inner surface of the pot body is modified, and the oil gathering capacity of the pot body is improved.

The embossing treatment is a process of hot rolling the fabric by high frequency or a pair of rollers engraved with patterns with certain depth to enable the fabric to generate concave-convex patterns with relief style three-dimensional effect and special gloss effect, and can realize the formation of a convex structure on the surface of the pot body, thereby changing the surface tension of the inner surface of the pot body. For example, an embossing process can be adopted, and different embossing dies are utilized to form convex micro-nano structures with different shapes or sizes at different positions on the inner surface of the pot body. The shot blasting treatment utilizes shot flow moving at high speed to continuously impact the surface of a strengthened workpiece, so that the microstructure, the surface roughness and the like of the target material surface and the surface layer are forced to change in the cyclic deformation process, the shot blasting adopted in the shot blasting treatment is spherical or sphere-like, the shot blasting material comprises steel shots, aluminum shots, ceramic micro powder, steel sand, walnut sand, corn cobs, glass beads, resin sand, plastic sand and the like, and the spherical or sphere-like shot blasting treatment is carried out to obtain the arc-shaped convex micro-nano structure.

In this embodiment, the shot blasting diameter of the shot blasting treatment is 0.5mm to 2.0mm, for example, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2.0mm, and the like, and within the above-mentioned limit, the inner surface of the pot body after the shot blasting treatment can form a micro-nano-sized circular arc-shaped protruding structure.

Etching treatment is a technique of treating the surface of an object by chemical strong acid etching, mechanical polishing, or electrochemical electrolysis. The etching process includes at least one of a mechanical etching process, a laser etching process, and a chemical etching process. The laser for laser etching treatment is generally ultraviolet laser, fiber laser and the like, has the characteristics of no contact, high speed and high efficiency when being etched, and can be used for preparing square column-shaped and rib-shaped structures.

In some embodiments, the surface modification of the pan body is followed by polishing and degreasing of the pan body to form a high-gloss and clean inner surface of the pan body.

In some embodiments, the present application is not limited to the process of forming the non-stick coating, and exemplary ways of applying the composite non-stick coating include at least one of arc spraying, plasma spraying, and supersonic flame spraying.

In some embodiments, the thickness of the non-stick coating formed by applying the composite non-stick coating on the inner surface of the pan body is 100 μm to 200 μm, and specifically, the thickness of the non-stick coating may be 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, and the like, or may be other values within the above range, which is not limited herein. The thickness of the non-stick coating is more than 200 mu m, so that the bonding force of the coating is reduced, the consumption of raw materials is large, and the cost is increased; the thickness of the non-stick coating is less than 100 μm, resulting in poor non-stick performance of the coating.

And S302, performing heat treatment on the surface of the non-stick coating formed in the S301 to obtain the cooking utensil.

In some embodiments, the temperature of the heat treatment is 380 to 400 ℃, specifically, the temperature of the heat treatment may be 380 ℃, 385 ℃, 390 ℃, 395 ℃ and 400 ℃, etc., and may be other values within the above range, which is not limited herein. If the heat treatment temperature is less than 380 ℃, the fluoropolymer powder cannot be completely melted, and film formation is difficult. If the heat treatment temperature is higher than 400 ℃, the decomposition of the fluoropolymer powder by carbonization may be caused and the anti-sticking effect may not be obtained.

In some embodiments, the time period of the heat treatment is 5min to 8min, and specifically, the time period of the heat treatment may be 5min, 6min, 7min, 8min, and the like, or may be other values within the above range, which is not limited herein.

In some embodiments, the heat treatment is performed in an inert gas atmosphere, and the inert gas may be, for example, argon, nitrogen, helium, and the like, which is not limited herein.

The cooking utensil obtained by the preparation method can achieve high food non-stick property, can also improve hardness and corrosion resistance of the cooking utensil, further enhances hardness of the non-stick coating and binding force of the non-stick coating and a pot body after heat treatment, and accordingly achieves the cooking utensil with high hardness, wear resistance, corrosion resistance and excellent non-stick property.

The following takes a stainless steel pot as an example, and the following provides a plurality of embodiments to further describe the embodiments of the present application. The present embodiments are not limited to the following specific examples. The present invention can be modified and implemented as appropriate within the scope of the main claim.

Example 1

Step S100, taking a stainless steel sheet with the thickness of 0.2mm, winding the stainless steel sheet into a cylindrical structure, performing wire rotating treatment on the cylindrical stainless steel sheet by using a wire rotating machine, injecting polytetrafluoroethylene (polytetrafluoroethylene with the median particle size of 3 microns, the volume percentage of 10 percent, polytetrafluoroethylene with the median particle size of 20 microns, the volume percentage of 25 percent, polytetrafluoroethylene with the median particle size of 70 microns, the volume percentage of 65 percent) in the wire rotating process to obtain a stainless steel wire material coating layer of a tubular body or a similar tubular body, and distributing polytetrafluoroethylene in the coating layer to obtain the composite non-stick coating, wherein the volume ratio of the stainless steel wire material to the polytetrafluoroethylene is 1:5.

and S200, forming a 304 stainless steel pot body with a cooking cavity by stretching and forming the stainless steel plate, and performing pretreatment of oil removal, mechanical sanding, shot blasting, sand blasting and chemical corrosion on the surface of the 304 stainless steel pot body.

And S300, coating the composite non-stick coating obtained in the step S100 on the inner surface of the stainless steel pot body in an electric arc wire spraying mode, and carrying out heat treatment on the stainless steel pot body in a high-temperature oven at 400 ℃ for 5min to obtain the cooking utensil disclosed by the invention.

Example 2

Different from the embodiment 1, the volume ratio of the stainless steel wire material to the polytetrafluoroethylene in the step S100 is 1:4.

example 3

Different from the embodiment 1, the volume ratio of the stainless steel wire material to the polytetrafluoroethylene in the step S100 is 1:6.

example 4

Different from the embodiment 1, the volume ratio of the stainless steel wire material to the polytetrafluoroethylene in the step S100 is 1:8.

example 5

Different from the embodiment 1, the volume ratio of the stainless steel wire material to the polytetrafluoroethylene in the step S100 is 1:10.

example 6

Different from the embodiment 1, the volume ratio of the stainless steel wire material to the polytetrafluoroethylene in the step S100 is 1:12.

example 7

Unlike in embodiment 1, in step S100: polytetrafluoroethylene with the median particle size of 3 mu m, the volume percentage is 20%; polytetrafluoroethylene with the median particle size of 20 mu m, the volume percentage of which is 30 percent; the volume percentage of the polytetrafluoroethylene with the median particle diameter of 70 mu m is 50 percent.

Example 8

Unlike embodiment 1, in step S100: 100% by volume of polytetrafluoroethylene having a median particle size of 70 μm.

Example 9

Unlike embodiment 1, in step S100: 100% by volume of polytetrafluoroethylene having a median particle diameter of 20 μm.

Comparative example 1

And S100, forming a 304 stainless steel pot body with a cooking cavity by stretching and forming the stainless steel plate, and performing pretreatment of oil removal, mechanical sanding, shot blasting, sand blasting and chemical corrosion on the surface of the 304 stainless steel pot body.

And S200, coating the ceramic coating on the inner surface of the stainless steel pot body in an electric arc wire spraying mode to form a non-stick coating, and obtaining the cooking utensil.

Comparative example 2

And S100, forming a 304 stainless steel pot body with a cooking cavity by stretching and forming the stainless steel plate, and performing pretreatment of oil removal, mechanical sanding, shot blasting, sand blasting and chemical corrosion on the surface of the 304 stainless steel pot body.

And step S200, coating the polytetrafluoroethylene coating on the inner surface of the stainless steel pot body in an electric arc wire spraying mode to form a non-stick coating, and obtaining the cooking utensil.

Performance test

The following procedure was carried out in the same environment, and the following tests were carried out for the performance of examples 1 to 9 and comparative examples 1 to 2:

(1) The thickness measurement is to place the cross section of the product under a microscope magnifier to observe and measure the relevant thickness.

(2) The wear resistance test was carried out according to the national standard GB/T32388 for cookware products.

(3) The hardness of the product was tested using a rockwell hardness tester.

The results of the above tests are shown in table 1 below.

TABLE 1 Performance parameters of the examples and comparative examples

According to the data in table 1 above, in the cooking utensil prepared in embodiments 1 to 9, the composite non-stick coating of the present application includes a fluoropolymer and a conductive metal coating layer coated on the surface of the fluoropolymer, wherein the presence of the fluoropolymer can improve the non-stick property of the non-stick coating and has certain high temperature and low temperature resistance; the conductive metal has stronger hardness, lower friction coefficient, higher heat transfer effect and excellent corrosion resistance, and is coated on the surface of the fluoropolymer to be used as a non-stick coating of the pot body, so that the non-stick coating has high hardness, good wear resistance and excellent non-stick performance, thereby improving the performance stability of the cooking utensil.

Comparative example 1 the non-stick coating for cooking utensils prepared by directly spraying ceramic paint on the inner surface of a stainless steel pot body is thin, and the hardness and the wear-resisting times are poor, so that the requirements of the cooking utensils cannot be met.

Comparative example 2 a cooking utensil prepared by directly spraying polytetrafluoroethylene coating on the inner surface of a stainless steel pot was also thin in thickness and was significantly inferior in hardness and wear resistance to the cooking utensil prepared in example 1 of the present application.

Claims (10)

1. The cooking utensil is characterized by comprising a pot body, wherein at least part of the surface of the pot body is provided with a non-stick coating, the non-stick coating comprises a composite non-stick coating, the composite non-stick coating comprises a fluorine-containing polymer and a coating layer coated on the surface of the fluorine-containing polymer, and the coating layer is made of a conductive metal.

2. The cooking appliance of claim 1, wherein the volume ratio of the fluoropolymer to the coating layer is (5-10): 1.

3. the cooking appliance according to claim 1, wherein the particle size of the fluoropolymer is 3 μm to 70 μm.

4. The cooking appliance of claim 3, wherein the cooking appliance comprises at least one of the following features a-c:

a. the volume of the fluorine-containing polymer with the particle size of 50-70 μm in the total fluorine-containing polymer accounts for 50-65%;

b. the volume of the fluorine-containing polymer with the particle size of 20-50 mu m in the total fluorine-containing polymer accounts for 25-30%;

c. the volume of the fluoropolymer with the grain diameter of 3-20 mu m in the total fluoropolymer accounts for 10-20%.

5. The cooking appliance of claim 1, wherein the cooking appliance comprises at least one of the following features a-c:

a. the fluorine-containing polymer comprises at least one of polytetrafluoroethylene, ammonium perfluorooctanoate, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a polyfluorinated ethylene propylene copolymer and an ethylene-tetrafluoroethylene copolymer;

b. the conductive metal comprises at least one of aluminum, stainless steel and iron;

c. the material of the pan body comprises at least one of aluminum alloy, aluminum, stainless steel, iron and low-carbon steel.

6. The cooking appliance according to claim 1 or 5, wherein the material of the pot body is the same as the material of the conductive metal wire.

7. The cooking appliance of claim 1, wherein the cooking appliance comprises at least one of the following features a-e:

a. the particle size of the composite non-stick coating is 3-70 mu m;

b. the thickness of the non-stick coating is 100-200 μm;

c. the hardness of the cooking utensil is 100 HV-200 HV;

d. the surface porosity of the cooking utensil is 3% -15%;

e. the roughness of the inner surface of the cooking utensil is 5-12 mu m.

8. A method of preparing a cooking appliance, comprising the steps of:

providing a conductive metal strip, winding the conductive metal strip into a cylindrical shape, performing wire-rotating treatment on the cylindrical conductive metal strip to form a tubular wire or a similar tubular wire, and injecting polyfluorinated compound powder in the process of wire-rotating treatment to obtain a composite non-stick coating, wherein the composite non-stick coating comprises a fluorine-containing polymer and a coating layer coated on the surface of the fluorine-containing polymer, and the coating layer is a conductive metal wire;

forming a base material into a pot body with a cooking cavity through stretching;

and coating the composite non-stick coating on the inner surface of the pot body, and carrying out heat treatment on the inner surface of the pot body to obtain the cooking utensil.

9. The method according to claim 8, characterized in that it comprises at least one of the following technical features a to i:

a. the fluorine-containing polymer comprises at least one of polytetrafluoroethylene, ammonium perfluorooctanoate, a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene, a polyfluorinated ethylene propylene copolymer and an ethylene-tetrafluoroethylene copolymer;

b. the conductive metal strip comprises at least one of an aluminum strip, a stainless steel strip and an iron strip;

c. the volume ratio of the fluorine-containing polymer to the coating layer is (5-10): 1;

d. the particle size of the fluorine-containing polymer is 3-70 μm;

e. the particle size of the fluorine-containing polymer is 3-70 μm, and the volume of the fluorine-containing polymer with the particle size of 50-70 μm in the total fluorine-containing polymer accounts for 50-65%;

f. the particle size of the fluorine-containing polymer is 3-70 μm, and the volume of the fluorine-containing polymer with the particle size of 20-50 μm in the total fluorine-containing polymer accounts for 25-30%;

g. the particle size of the fluorine-containing polymer is 3-70 μm, and the volume of the fluorine-containing polymer with the particle size of 3-20 μm in the total fluorine-containing polymer accounts for 10-20%;

h. the material of the pan body comprises at least one of aluminum alloy, aluminum, stainless steel, iron and low-carbon steel;

i. the diameter of the wire is 0.8 mm-2.0 mm.

10. The method for preparing according to claim 8, characterized in that it comprises at least one of the following technical features a to c:

a. the temperature of the heat treatment is 380-400 ℃;

b. the time of the heat treatment is 5min to 10min;

c. the heat treatment is carried out in an inert gas atmosphere.

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