Novel non-stick pan and preparation method thereof

Abstract

The invention discloses a novel non-stick cookware and a preparation method thereof, and belongs to the technical field of kitchenware manufacturing, the novel non-stick cookware comprises a cookware base layer made of a metal material, a transition layer made of metal alloy is attached to the inner surface of the cookware base layer in a composite mode, and a diamond layer is fixed to the top surface of the transition layer. The diamond layer is formed by arranging a plurality of single diamond particles or agglomerates on the inner surface of the pot base layer in a single layer, gaps among the diamond particles of the diamond layer are filled with non-sticky resin materials to form a non-sticky resin layer, and the non-sticky resin layer enables the top end faces of the single diamond particles or agglomerates to be in an exposed state; the preparation method comprises the steps of pot base layer preparation, transition layer coating, diamond layer spreading, vacuum brazing, diamond layer surface grinding, non-stick resin layer filling, curing and the like. The diamond particles are firmly fixed on the surface of the pan base layer in a metallurgical chemical bonding manner, so that the high-performance non-stick pan which is long-acting, non-stick, ultra-strong in wear resistance and uniform in heat conduction is manufactured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of kitchen utensil manufacturing, and particularly relates to a non-stick pot with diamond particles firmly fixed in the inner surface of a metal pot base layer by a vacuum brazing process and a preparation method thereof. BACKGROUND

[0002] Non-stick pots have become essential kitchen utensils in modern kitchens. Currently, the non-stick pots on the market mainly rely on surface coating technologies, such as polytetrafluoroethylene (Teflon) coating and ceramic coating. However, these coatings have obvious limitations: the polytetrafluoroethylene coating has poor high-temperature resistance (usually not more than 260℃), low hardness, and is easily scratched by spatulas; the ceramic coating has slightly better high-temperature resistance, but is brittle, prone to cracking or peeling, and the silicon-based adhesive may volatilize at high temperatures, affecting durability.

[0003] To solve the problem of easy damage to the coating, the prior art has proposed a scheme of adding hard particles (such as titanium, sapphire, aluminum oxide, and even diamond particles) to the coating. However, these hard particles are only physically mixed in the coating, and lack strong chemical bonding between the pot base layer and the coating material, so the fixing strength is low, and the problem of coating peeling and particle falling has not been fundamentally solved. In addition, there are also "0-coating" non-stick pots on the market, such as titanium alloy pots and nitriding iron pots, which rely on a dense metal surface to achieve non-stickness, but usually require meticulous maintenance, and the non-stick performance will gradually deteriorate with use. Therefore, there is an urgent need in the art for a non-stick pot product that has excellent non-stickness, extremely high wear resistance, good thermal conductivity, long service life, and high safety, as well as a reliable preparation method thereof. SUMMARY

[0004] The technical problem solved: In view of the defects of weak coating adhesion, easy wear, and poor high-temperature resistance of non-stick pots in the background art, the present application provides a new type of non-stick pot and a preparation method thereof, which can firmly fix diamond particles on the surface of the pot base layer by metallurgical chemical bonding, thereby manufacturing a high-performance non-stick pot with long-lasting non-stickness, super wear resistance, and uniform thermal conductivity.

[0005] Technical solution: The preparation method of a new type of non-stick pot according to the present application, the non-stick pot comprises a pot base layer made of metal material, a transition layer made of metal alloy is attached to the inner surface of the pot base layer, a diamond layer is fixed on the top surface of the transition layer, a plurality of diamond particles are arranged in a single layer on the inner surface of the pot base layer as single particles or clusters, and a non-stick resin layer is formed by filling non-stick resin material into the gaps between the diamond particles in the diamond layer, so that the top end surface of the diamond particles as single particles or clusters is in an exposed state. The preparation method of the non-stick pot comprises the following steps: Step 1: selecting a pot base layer; Step 2: A metal alloy transition layer material is provided on the inner surface of the pan base layer, the transition layer material being a paste made by mixing with a water-based binder or a metal alloy powder, which is coated on the inner surface of the pan base layer by screen printing or spraying; Step 3: Diamond particles are provided on the surface of the transition layer material, the diamond particles being of a single size or a mixture of sizes, and the center-to-center distance between the particles being no more than 1.4 times the average particle size of the diamond particles; Step 4: Heating is performed in a vacuum or inert gas environment to melt the transition layer material and form a transition layer, and to cause metallurgical and chemical bonding between the transition layer material, the diamond particles, and the inner surface of the pan base layer, thereby fixing the diamond particles to form a diamond layer; Step 5: The surface of the diamond layer is polished; Step 6: Silicone non-stick resin is coated on the surface of the polished diamond layer to fill the gaps between the diamond particles; Step 7: The silicone non-stick resin is cured by heating at 180-250°C for 30-60 minutes to form a non-stick resin layer.

[0006] Preferably, between Step 2 and Step 3, there is also a step of: After the transition layer material is provided, a first heating is performed to melt the transition layer material and form a transition layer; After cooling, a binder is coated on the surface of the transition layer, and Step 3 of providing diamond particles is performed, and in Step 4, a second heating is performed to fix the diamond particles.

[0007] Preferably, the transition layer is a copper-based alloy layer, and the composition includes, by weight percentage, 3%-10% tin, 2.5%-8% titanium, and the balance copper; more preferably, the composition includes, by weight percentage, 5%-8% tin, 3%-6% titanium, and the balance copper; and the heating temperature in Step 4 is 890-1040°C.

[0008] Preferably, the transition layer is a silver-based alloy layer, and the composition includes, by weight percentage, 66%-72% silver, 25%-29% copper, and 3%-5.5% titanium; and the heating temperature in Step 4 is 760-820°C.

[0009] Preferably, in Step 5, the surface of the diamond layer is polished to have a surface roughness Ra of no more than 0.8 microns, and the height of the top ends of the diamond particles or groups exposed on the surface of the transition layer is no more than 60% of the average particle size.

[0010] Preferably, the material of the pan base layer is one of stainless steel, carbon steel, pure iron, or copper; and the stainless steel is austenitic stainless steel, ferritic stainless steel, or composite layer stainless steel.

[0011] Preferably, when the diamond layer is composed of diamond particle monomers, the diamond layer is made of artificial diamond particles or natural diamond particles, the diamond particles are spherical or near-spherical, and the profile edges are blunted, and the particle size range is 0-125 microns.

[0012] Preferably, when the diamond layer is composed of diamond particle clusters, the diamond particle clusters are agglomerates of nano-diamond particles, wherein the particle size of the nano-diamond crystals is 3-200 nanometers, and the agglomerate particle size is 25-90 microns.

[0013] Preferably, the non-stick resin layer is an organic silicon resin, which is a two-component addition type heat-cured food-grade liquid silicone rubber; the organic silicon resin comprises an A component and a B component, the A component is a polyorganosiloxane containing a vinyl group, and the B component is a hydrogen-containing silicone oil; a crosslinking agent forms a crosslinking network with the vinyl group of the A component through a silicon-hydrogen addition reaction.

[0014] The application also discloses a new non-stick pot made by the method.

[0015] Compared with the prior art, the application has at least the following beneficial effects: 1. The diamond layer adopted in the application is firmly fixed in the inner surface of the pot base layer through high-temperature heating, vacuum or inert gas protection, vacuum brazing process, metallurgical chemical reaction of the metal alloy of the transition layer with the carbon elements on the surface of the diamond particles to generate carbide, and diffusion bonding with the pot base layer, so that the diamond layer is firmly fixed in the inner surface of the pot base layer with extremely high bonding strength, fundamentally solving the peeling problem of the diamond particles and the coating; based on the diamond layer, high hardness, high thermal conductivity, chemical inertness, the extremely high hardness provides unparalleled wear resistance for the pot body, when the pot is heated, the diamond layer surface directly contacts the food material, preventing the adhesion of the food material, and the thermal conductivity is uniform; and the non-stick resin in the gap between the diamond particles can be effectively protected, the heating temperature of the organic silicon material is greatly reduced, the service life is effectively protected, and the high wear resistance of the diamond layer ensures the super-long service life of the pot; 2. The transition layer adopted in the non-stick pot realizes the firm combination of the diamond layer and the pot base layer through metallurgical chemical reaction, ensures the firm fixation of the diamond particles, prevents the diamond particles of the diamond layer from falling off, and further along the service life of the pot; the diamond itself has strong chemical inertness, low surface energy, and natural non-stick properties; at the same time, the excellent thermal conductivity ensures that the pot body is quickly and uniformly heated, avoiding local overheating; 3. The diamond layer uses silicone material to fill the gaps between diamond particle monomers or agglomerates, forming a non-stick resin layer. This ensures the diamond particle monomers or agglomerates are exposed, allowing for good contact between the food and the diamond layer while reducing contact between the non-stick resin layer and the food. The non-stick resin is food-grade silicone, resistant to temperatures above 250℃, and the diamond layer's protection further lowers the actual temperature it can withstand, allowing the entire pot to withstand temperatures above 500℃. The selected transition layer alloy is safe and non-toxic, free of harmful substances such as lead and cadmium. It enhances the non-stick properties of the cookware while improving the adhesion strength of the diamond layer, ensuring safety and harmlessness. 4. This non-stick cookware has a simple structure, is suitable for various pot base materials, and has flexible processing technology. Attached Figure Description

[0016] Fig. 1 This is a cross-sectional view of the non-stick cookware according to the first embodiment of the present invention along its thickness direction; Fig. 2 This is a cross-sectional view of the non-stick cookware according to the second embodiment of the present invention along its thickness direction; Fig. 3 This is a cross-sectional view of the non-stick cookware according to the third embodiment of the present invention along its thickness direction.

[0017] Reference numerals: 1. Pot base layer; 2. Transition layer; 3. Diamond layer; 4. Non-stick resin layer; 5. Nano diamond particles; 6. Diamond particle clusters; 7. Magnetic stainless steel layer; 8. Diamond particle monomers. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figs. 1-3 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0019] Example 1: As Figs. 1-2As shown, the present application discloses a new non-stick pot, the non-stick pot comprises a pot base layer 1 made of metal material, a transition layer 2 made of metal alloy is attached to the inner surface of the pot base layer 1, the top surface of the transition layer 2 is fixed with a diamond layer 3, the diamond layer 3 is arranged on the inner surface of the pot base layer in a single layer by a plurality of diamond particles monomers or clusters, and a non-stick resin layer 4 is formed by filling the gap between the diamond particles in the diamond layer 3 with non-stick resin material, and the top end surface of the diamond particle monomer or cluster is in an exposed state. The diamond layer adopted by the present application is heated at high temperature, and under vacuum or inert gas protection, the metal alloy of the transition layer is melted and reacts with the carbon elements on the surface of the diamond particles to form carbide through vacuum brazing process, and diffusion bonding is formed with the pot base layer, so as to be firmly fixed on the inner surface of the pot base layer, and the bonding strength is extremely high, which fundamentally solves the peeling problem of diamond particles and coating; based on the diamond layer, high hardness, high thermal conductivity and chemical inertness are provided, the extremely high hardness provides unparalleled wear resistance for the pot body, when the pot is heated, the diamond layer surface directly contacts with the food material, preventing the adhesion of the food material, and the heat conduction is uniform; and the non-stick resin in the gap between the diamond particles can be effectively protected, the heating temperature of the organic silicon material is greatly reduced, the service life is effectively protected, and the high wear resistance of the diamond layer ensures the super-long service life of the pot.

[0020] In a preferred embodiment, the material of the pot base layer 1 is one of stainless steel, carbon steel, pure iron or copper, and the material of the non-stick pot can be conveniently selected to meet most household scenarios. For example, the commonly used stainless steel pot, the austenitic stainless steel, ferritic stainless steel or composite layer stainless steel can be selected. It should be noted that the stainless steel material is preferably used as the pot base material in order to further prevent rust and corrosion, reduce rust and other problems caused by cleaning and use of iron pots, and the transition alloy layer can be diffusionally fixed and combined with carbon steel, iron, copper and other materials, and the reaction nature is the same, only the stainless steel has more excellent rust and corrosion resistance, so the stainless steel material is preferred, and the 304 stainless steel and 316 or 316L stainless steel with better acid and alkali corrosion resistance are further preferred in the stainless steel material; other steel or iron or copper such as carbon steel, alloy steel, pure iron, red copper, etc. can be used to achieve the effect of the surface diamond layer, which also belongs to the scope of the patent right.

[0021] In a preferred embodiment, the transition layer 2 is made of a copper-based alloy layer or a silver-based alloy layer. The transition layer of the non-stick cookware realizes firm combination of the diamond layer and the base layer of the cookware through metallurgical chemical reaction, ensures firm fixation of the diamond particles, prevents the diamond particles of the diamond layer from falling off, and further along the service life of the cookware; the selected transition layer alloy composition is safe and non-toxic, does not contain harmful substances such as lead and cadmium, and enhances the non-stick property of the cookware while being safe and harmless. It should be noted that the composition of the copper-based transition layer is copper-tin-titanium, in which copper (Copper) is an essential trace element for the human body, as long as the migration amount does not exceed the standard, it is safe; similarly, the oral toxicity of metal tin (Tin) and its inorganic salts is very low, and they are difficult to be absorbed by the intestinal tract; titanium (Titanium) is one of the metals with the best biocompatibility recognized, and is widely used in medical implants, and is extremely stable and safe. The titanium element in the transition alloy layer can chemically and metallurgically combine with diamond to form titanium carbide under the condition of a protective atmosphere, and this carbide firmly connects the diamond and the transition alloy, and the titanium element in the transition alloy can diffuse and combine with the base material of the cookware under the reaction condition, so that the diamond layer is firmly connected with the base layer through the effect of the transition alloy layer. Similarly, the silver element in the silver-based alloy transition layer has a sterilizing effect, and the safety of the above-mentioned transition layer elements makes it possible to apply them to the cookware.

[0022] In a specific embodiment, as shown in Fig. 1 When the diamond layer 3 is composed of a plurality of diamond particle monomers 8, the diamond particle monomers 8 are arranged in a single layer on the inner surface of the base layer, which is made of artificial diamond particles or natural diamond particles, and the particle size range is 0-125 microns; the distribution of the diamond particles on the inner surface of the pot can be a single particle size or a mixed particle size, that is, large and small diamond particles are distributed on the inner surface of the pot at the same time. The diamond particles are spherical or nearly spherical, and the profile edge is blunt, the surface of the diamond particle monomer is plated with one of titanium, chromium or silicon, and the plating layer on the surface of the diamond particle can form a carbide with the diamond particle under vacuum brazing conditions, so as to facilitate the combination of the diamond particle and the alloy material and further improve the fixation strength. The center-to-center distance of the diamond particle monomers is not greater than 1.4 times the average particle size, and the distribution of the diamond particles can be uniform and disordered, or arranged in a certain pattern. If the gap between the diamond particle monomers is too large, the non-stick resin layer will be in contact with the food, preventing the special food from impacting the gap of the diamond layer and wearing the organic silicon non-stick resin; if the gap between the diamond particle monomers is too small, the non-stick resin layer is not easy to apply or the amount is small, which reduces the fixation strength of the diamond particle monomers.

[0023] In another specific embodiment, as shown in Fig. 2As shown, when the diamond layer 3 is composed of a plurality of diamond particle clusters 6, the diamond particle clusters 6 are arranged in a single layer on the inner surface of the pot base layer, and the diamond particle clusters are agglomerates of agglomerated nano-diamond particles 5, wherein the particle size of the nano-diamond crystals is 3-200 nanometers, and the particle size of the agglomerates is 25-90 microns. The center-to-center distance of the diamond particle clusters is not more than 1.4 times the average particle size, in order to maintain the tightness between the diamonds and prevent the gap between the diamond layer from being impacted by the special food material and causing the silicone non-stick resin to wear; it can also be arranged with different particle sizes, wherein the height difference between the large-particle-size diamonds and the small-particle-size diamonds is filled with silicone non-stick resin; similarly, the spacing L of the large-particle-size diamonds is less than 1.4 times the average particle size of the large-particle-size diamonds. Similarly, the diamond particle clusters are fixed to the inner surface of the pot base layer 1 through the transition layer 2; the height of the top of the diamond particle clusters exposed on the surface of the transition layer is not more than 60% of the average particle size. It should be noted that even if single-layer nano-diamond particles are used, certain non-stick and wear-resistant performance effects can be achieved, but the thickness is too thin to effectively play the role of a protective layer, so agglomerated diamond particles are used to achieve a certain coating thickness; the closer the shape of the diamond particle clusters to a sphere, the better, which can further reduce the surface energy and reduce the friction between the diamonds and the food material.

[0024] In a preferred embodiment, the non-stick resin layer 4 is an organic silicone resin, which is a two-component addition type (platinum catalyst) heat-cured food-grade liquid silicone rubber. The organic silicone resin includes A component and B component. The A component is a vinyl-containing polyorganosiloxane, which is usually a vinyl-containing polysiloxane with terminal or side chains, is the main backbone of the reaction, and provides the main structure of the cured product. The B component is a hydrogen-containing silicone oil (polyorganohydrogensiloxane) containing active Si-H bonds in the molecule. The crosslinking agent (curing agent) forms a crosslinked network through a silicon-hydrogen addition reaction with the vinyl group of the A component. The platinum catalyst (platinum catalyst) is usually a platinum complex that catalyzes the silicon-hydrogen addition reaction and reduces the activation energy of the reaction. The organic silicone resin is advantageous in that it does not contain fluoride and is friendly to the human body. The gap between the diamond particle monomers or clusters in the diamond layer is filled with an organic silicone material to form a non-resin layer, and the top of the diamond particle monomers or clusters in the diamond layer is exposed, with the height of the top of the diamond particle monomers or clusters exposed on the surface of the transition layer being not more than 60% of the average particle size, achieving good contact between the food material and the diamond layer and reducing the contact between the non-stick resin layer and the food material. The non-stick resin is a food-grade organic silicone that can withstand temperatures above 250°C, and the protection of the diamond layer makes the actual temperature it withstands even lower. The entire pot can withstand high temperatures above 500°C, improving the adhesion strength of the diamond layer while enhancing the non-stickness and safety of the pot.

[0025] In a preferred embodiment, as Fig. 3As shown, the bottom surface of the pot base layer 1 is provided with a magnetic conductive stainless steel layer 7, which further expands the use scenarios of the non-stick pot, such as use on an induction cooker.

[0026] The application will be further described in detail below in combination with examples, but the protection scope of the application is not limited to the following examples.

[0027] The application also discloses a preparation method of the novel non-stick pot, comprising the following steps: Step 1: selecting a pot base layer 1; the material of the pot base layer 1 is one of stainless steel, carbon steel, pure iron or copper; the stainless steel is austenitic stainless steel, ferritic stainless steel or composite layer stainless steel.

[0028] Step 2: providing a metal alloy transition layer material on the inner surface of the pot base layer 1; the transition layer material is a paste or a metal alloy powder mixed with a water-based binder, which is coated on the inner surface of the pot base layer 1 by screen printing or spraying; the transition layer 2 is a copper-based alloy layer; according to the weight percentage, the composition includes: tin 3%-10%, titanium 2.5%-8%, and the balance is copper; more preferably, according to the weight percentage, the composition includes: tin 5%-8%, titanium 3%-6%, and the balance is copper. Or the transition layer 2 is a silver-based alloy layer; according to the weight percentage, the composition includes: silver 66%-72%, copper 25%-29%, and titanium 3%-5.5%. When the transition layer material is a paste alloy, the water-based binder can be carboxymethyl cellulose, or polyvinyl alcohol, or a mixture of the two and other water-based binders, and related materials such as dispersants and thickeners can also be added to improve the paste property. The main purpose of preparing the transition layer alloy powder into a paste with a water-based binder is to effectively coat the transition layer alloy powder on the surface of the pot base layer and make it evenly coated. The transition layer alloy can also be pre-alloy particles prepared from the above elements, with a particle size range of 80-600 mesh; when the transition layer alloy particles are in powder form, the granular particles need to be evenly arranged on the surface of the pot base layer, so a layer of acrylic pressure-sensitive adhesive binder needs to be coated on the surface of the pot base layer first. The acrylic pressure-sensitive adhesive binder can be water-based or oil-based, with a volume ratio of glue to diluent of 1:6-1:12, so that the powder alloy particles can be bonded to the surface of the pot base layer. The amount of transition layer alloy powder coating has a certain volume ratio relationship with the amount of diamond, and in the loose density state, the volume ratio of transition layer alloy powder to diamond particles is generally 1:1.5-1:0.6; more preferably, the volume ratio of transition layer alloy powder to diamond particles is 1:1.2-1:0.8.

[0029] Step 3: setting diamond particles monomer or group on the surface of the transition layer material; when setting the diamond particles monomer or group, single particle size or mixed particle size of the diamond particles is used, wherein the center distance between the particles is not greater than 1.4 times the average particle size of the diamond; when the coating of the transition layer alloy is completed, the setting of the diamond particles monomer or group can be performed in two ways: one is to arrange the diamond particles on the surface of the coated transition layer alloy; the other is to arrange the diamond particles after the transition layer alloy is heated and melted to form a fixed alloy bottom layer.

[0030] The first specific arrangement mode of the diamond particles is that when the diamond particles monomer or group is arranged directly on the surface of the coated transition layer alloy, the surface of the paste-shaped alloy layer has certain adhesion, so that the diamond particles monomer or group can be uniformly spread and filled on the surface of the coated alloy layer. According to the design particle size requirement, the diamond particles are arranged in a single layer after being spread on the alloy layer, but there may still be certain gaps, so that the diamond particles with finer particle size can be continuously spread to further fill the gaps between the diamond particles. If the powder-shaped alloy layer is coated on the surface of the pan base layer at this time, the powder-shaped alloy surface has no adhesion and cannot adhere to the diamond particles, so a layer of adhesive needs to be sprayed on the surface of the alloy layer, the adhesive is the same as the first coated adhesive, which is an acrylic adhesive, and then the diamond particles monomer or group is spread, and the spreading process is consistent with the foregoing spreading process. After the transition layer alloy and the diamond particles are uniformly spread, the subsequent step 4 of heating and curing process is entered.

[0031] The second specific arrangement mode of the diamond particles is that after the transition layer material is set in step 2, the first heating is performed to melt the transition layer material to form the transition layer 2; after cooling, the adhesive is coated on the surface of the transition layer 2, and then the diamond particle setting of step 3 is performed; and in step 4, the second heating is performed to fix the diamond particles monomer or group.

[0032] It should be noted that the above two preparation processes have their own characteristics, and the main difference lies in whether one or two heating chambers are used, one-time heating forming, relatively simple process, and fewer processes; two-time heating forming, high consistency of the alloy layer surface, high diamond particle distribution, and easy subsequent grinding processing.

[0033] Step 4: The transition layer material is melted to form the transition layer 2 and metallurgically combined with the diamond particles and the inner surface of the pot base layer 1 to fix the diamond particles and form the diamond layer 3 under heating in a vacuum or inert gas protection environment. The heating method can be resistance heating or induction heating. Commonly used equipment includes vacuum sintering furnace, vacuum heat treatment furnace, mesh belt furnace, etc., which can provide a vacuum environment or a protective atmosphere environment and a heating environment of up to 1040℃. Taking the vacuum sintering furnace as an example, the copper-based transition alloy layer can be effectively fixed by heating in a vacuum environment of 0.05 Pa, with a maximum temperature of 890-1040℃ and a holding time of 15-25 min. Similarly, the silver-based transition alloy layer can be melted to fix the diamond particles by heating in the same environment, with a maximum temperature of 760-820℃ and a holding time of 15-20 min.

[0034] Step 5: The surface of the diamond layer 3 is polished. After the preparation of the inner surface diamond layer of the semi-finished product, the diamond layer surface is not consistent in the microscopic state, which increases the friction coefficient and the microscopic coating surface energy, thereby reducing the non-stick performance. Therefore, the inner surface of the pot needs to be polished. The polishing can be performed using a pig iron block, or a metal bond diamond polishing block with finer granularity or a resin bond polishing block. The polishing can make the surface height consistent, the surface roughness Ra not greater than 0.8 microns, and the height of the top of the diamond particles or clusters of the diamond layer 3 exposed to the surface of the transition layer not greater than 60% of the average particle size.

[0035] Step 6: The polished diamond layer 3 is coated with silicone non-stick resin to fill the gaps between the diamond particles or clusters. The non-stick resin layer 4 is a two-component addition type heat-cured food-grade liquid silicone rubber. Step 7: The silicone non-stick resin is cured by heating at 180-250℃ for 30-60 min to form the non-stick resin layer 4.

[0036] Example 2: The application also discloses a preparation method of a non-stick pot, which comprises the following steps: (1) A 316 austenitic stainless steel stamping pot with a diameter of 10 inches (about 25.4 cm) is taken as the pot base layer 1, and is cleaned by sandblasting, ultrasonic cleaning and drying processes; (2) A copper-based alloy powder with components of Sn 6%, Ti 4% and Cu 90% is mixed with polyvinyl alcohol solution to form a paste, which is coated on the inner surface of the pot base layer 1 by screen printing, with a coating thickness of about 60 microns; (3) The surface of the transition layer material is uniformly sprinkled with 200 mesh (about 74 microns) spherical artificial diamond particles or clusters. The diamond particles or clusters are arranged in a single layer on the inner surface of the pot base layer, and the center-to-center distance of the particles is not greater than 1.4 times the average particle size of the diamond. (4) heating in a vacuum furnace at 0.05 Pa, heating temperature 950 °C, holding for 20 min, furnace cooling, so that the transition layer material melts to form the transition layer 2 and metallurgical chemical combination occurs between the transition layer 2 and the inner surface of the diamond particle monomer or agglomerate and the pot base layer 1, and the diamond particle monomer or agglomerate is fixed to form the diamond layer 3; (5) using a resin binder to polish the surface of the diamond layer 3, so that the surface roughness Ra is 0.3 μm, and the height of the top of the diamond particle monomer or agglomerate of the diamond layer 3 exposed to the surface of the transition layer is not more than 60% of the average particle size; (6) coating a two-component food-grade silicone resin on the surface of the polished diamond layer 3 to fill the gap between the diamond particle monomer or agglomerate, heating at 200 °C for 40 min to solidify and form the non-stick resin layer 4, so that a non-stick pot with uniform distribution of diamond, firm combination, non-stick and excellent wear resistance is obtained.

[0037] Example 3: The application also discloses a preparation method of a non-stick pot, comprising the following steps: (1) taking a 10-inch (about 25.4 cm) 304 / 430 composite steel pot as the pot base layer 1, and cleaning by sandblasting, ultrasonic cleaning and drying process; (2) mixing silver-based alloy material with a composition of Ag 70%, Cu 26.5%, and Ti 3.5% with polyvinyl alcohol solution into a paste, and coating on the inner surface of the pot base layer 1 by screen printing, and the coating thickness is about 60 μm; after the transition layer material is set, first heating is performed under argon protection, heating to 800 °C, holding for 15 min, so that the transition layer material melts to form the alloy bottom layer; (3) after cooling, brushing acrylic adhesive on the alloy bottom layer, and uniformly spreading 200 mesh (about 74 μm) spherical artificial diamond particle monomer or agglomerate, and the diamond particle monomer or agglomerate is arranged in a single layer on the inner surface of the pot base layer, and the center distance between the particles is not more than 1.4 times the average particle size of the diamond; (4) heating in a vacuum furnace at 0.05 Pa, heating temperature 780 °C, holding for 20 min, furnace cooling, so that the transition alloy bottom layer melts to form the transition layer 2, and metallurgical chemical combination occurs between the transition layer 2 and the inner surface of the diamond particle monomer or agglomerate and the pot base layer 1, and the diamond particle monomer or agglomerate is fixed to form the diamond layer 3; (5) using a resin binder to polish the surface of the diamond layer 3, so that the surface roughness Ra is 0.1 μm, and the height of the top of the diamond particle monomer or agglomerate of the diamond layer 3 exposed to the surface of the transition layer is not more than 60% of the average particle size; (6) After the diamond layer 3 is polished, a two-component food-grade silicone resin is coated on the surface of the diamond layer 3 to fill the gaps between the diamond particle monomers or groups, and the coated diamond layer 3 is baked at 200°C for 40 minutes to solidify the non-stick resin layer 4, so that the diamond layer has excellent height uniformity, a smooth surface like a mirror, and a top-level non-stick performance.

[0038] Example 4: The application also discloses a preparation method of the non-stick cookware, which comprises the following steps: (1) A 10-inch (about 25.4 cm) carbon steel pot formed by spinning is taken as the pot base layer 1, and the pot base layer 1 is cleaned by sandblasting, ultrasonic cleaning and drying processes; (2) Copper-based alloy powder with components of Sn 6%, Ti 4% and Cu 90% is mixed with polyvinyl alcohol solution to form a paste, and the paste is coated on the inner surface of the pot base layer 1 by screen printing, with a coating thickness of about 60 μm; (3) 200-mesh (about 74 μm) spherical artificial diamond particle monomers or groups are uniformly scattered on the surface of the transition layer material, and 400-mesh (about 38 μm) spherical artificial diamond particle monomers or groups are scattered to fill the gaps, so as to improve the filling density and support; (4) The transition layer material is melted to form the transition layer 2 by heating in a vacuum furnace at 0.05 Pa and at a temperature of 950°C for 20 minutes, and then the transition layer 2 is cooled with the furnace, so that the transition layer 2 is metallurgically and chemically combined with the diamond particle monomers or groups and the inner surface of the pot base layer 1, and the diamond particle monomers or groups are fixed to form the diamond layer 3; (5) The surface of the diamond layer 3 is polished using a resin binder, so that the surface roughness Ra of the diamond layer 3 is 0.8 μm, and the height of the top end of the diamond particle monomers or groups of the diamond layer 3 exposed on the surface of the transition layer is not more than 60% of the average particle size; (6) A two-component food-grade silicone resin is coated on the surface of the polished diamond layer 3 to fill the gaps between the diamond particle monomers or groups, and the coated diamond layer 3 is baked at 200°C for 40 minutes to solidify the non-stick resin layer 4, so that the non-stick cookware is obtained.

[0039] The comparative example uses the same pot base layer and diamond layer as in Example 1, but the transition layer is replaced by a common epoxy resin adhesive, and the non-stick cookware is obtained by solidifying at 200°C. After the same number of steel wire brushing tests, the diamond layer of Example 1 of the application has no shedding, while the diamond particles of the comparative example have mostly fallen off, which proves that the metallurgical and chemical combination effect is much better than the physical adhesion effect.

[0040] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can also be made several improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for preparing a new non-stick cookware, characterized in that, The non-stick pot includes a pot base layer (1) made of metal material, a transition layer (2) made of metal alloy is attached to the inner surface of the pot base layer (1), a diamond layer (3) is fixed on the top surface of the transition layer (2), a plurality of diamond particles are arranged on the inner surface of the pot base layer (3) in a single layer, and a non-stick resin layer (4) is formed by filling the gaps between the diamond particles in the diamond layer (3) with non-stick resin material, and the top end surface of the diamond particles is exposed. The preparation method of the non-stick pot includes the following steps: Step 1: select a pot base layer (1); Step 2: set the metal alloy transition layer material on the inner surface of the pot base layer (1), the transition layer material is a paste mixed with a water-based adhesive or a metal alloy powder, which is coated on the inner surface of the pot base layer (1) by screen printing or spraying; Step 3: set the diamond particles on the surface of the transition layer material, use single size or mixed size diamond particles, and the center distance between the particles is not more than 1.4 times the average particle size of the diamond; Step 4: heat in a vacuum or inert gas protection environment to melt the transition layer material to form a transition layer (2), and metallurgical chemical combination occurs between the transition layer material, the diamond particles and the inner surface of the pot base layer (1), and the diamond particles are fixed to form a diamond layer (3); Step 5: grind the surface of the diamond layer (3); Step 6: coat silicone non-stick resin on the surface of the ground diamond layer (3) to fill the gaps between the diamond particles; Step 7: heat and bake at 180-250℃ for 30-60min to cure the silicone non-stick resin to form a non-stick resin layer (4).

2. The method for producing a non-stick pan according to claim 1, wherein Between step 2 and step 3, there is also a step: After setting the transition layer material, first heat to melt the transition layer material to form a transition layer (2); After cooling, coat adhesive on the surface of the transition layer (2), and then set the diamond particles in step 3; and in step 4, heat again to fix the diamond particles.

3. The method for producing a non-stick pan according to claim 1, wherein The transition layer (2) is a copper-based alloy layer; its composition includes, by weight percentage: tin 3%-10%, titanium 2.5%-8%, and the balance is copper; more preferably, its composition includes, by weight percentage: tin 5%-8%, titanium 3%-6%, and the balance is copper; the heating temperature in step 4 is 890-1040℃.

4. The method for producing a non-stick pan according to claim 1, wherein The transition layer (2) is a silver-based alloy layer; its composition includes, by weight percentage: silver 66%-72%, copper 25%-29%, and titanium 3%-5.5%; the heating temperature in step 4 is 760-820℃.

5. The method for preparing a non-stick pan according to claim 1, wherein In step 5, grind the surface of the diamond layer (3) to make the surface roughness Ra not more than 0.8 microns, and the height of the top end of the diamond particles in the diamond layer (3) exposed on the surface of the transition layer is not more than 60% of the average particle size.

6. The method for producing a non-stick pan according to claim 1, wherein The material of the pot base layer (1) is one of stainless steel, carbon steel, pure iron or copper; the stainless steel is austenitic stainless steel, ferritic stainless steel or composite layer stainless steel.

7. The method for producing a non-stick pan according to claim 1, wherein When the diamond layer (3) is composed of diamond particle monomers, the diamond layer (3) is made of artificial diamond particles or natural diamond particles, the diamond particles are spherical or near-spherical, and the profile edge is blunt, and the particle size range is 0-125 microns.

8. The method of claim 1, wherein the non-stick cookware is prepared by the steps of: When the diamond layer (3) is composed of diamond particle clusters, the diamond particle clusters are agglomerates of nano-diamond particle agglomeration, wherein the particle size of the nano-diamond crystal is 3-200 nanometers, and the particle size of the agglomerate is 25-90 microns.

9. The method of claim 1, wherein the non-stick cookware is prepared by the steps of: The non-stick resin layer (4) is a silicone resin, which is a two-component addition type heat-curable food-grade liquid silicone rubber; the silicone resin includes component A and component B, component A is a polyorganosiloxane containing a vinyl group, and component B is a hydrogen-containing silicone oil; a crosslinking agent forms a crosslinking network with the vinyl group of component A through a silicon hydrogen addition reaction.

10. A new non-stick cookware characterized in that, The non-stick pot is made by any one of the methods of claims 1-9.

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