A treatment method for improving the cleanability of cookware surface

Abstract

The present invention belongs to the technical field of cookware, and specifically relates to a treatment method for improving the easy-to-clean properties of the cookware surface, comprising the following steps: mixing easy-to-clean powder with metal-coated powder to obtain a composite powder; processing the composite powder onto the surface of the cookware so that the metal-coated material covering the surface of the cookware melts and coats the easy-to-clean material to obtain an easy-to-clean layer; performing infiltration modification of the surface of the easy-to-clean layer with a sealing material, and forming a film layer on the surface of the easy-to-clean layer; and grinding the film layer to expose the easy-to-clean powder. The structural advantages of the cookware treated by the treatment method of the present invention make the functional layer less susceptible to wear. At the same time, it changes the way the easy-to-clean material exists only on the surface, and also changes the phenomenon that only the surface has easy-to-clean properties. Even when the surface layer is worn, the newly exposed coating material can still provide easy-to-clean properties. In addition, the cookware is non-toxic and harmless during use.

Description

Technical Field

[0001] The invention belongs to the technical field of cookware, and in particular relates to a treatment method for improving the cleanability of the surface of a cookware. Background Art

[0002] There is a demand for over 100 million non-stick cookware each year. Currently, the easy-to-clean effect is achieved through the surface effect of the non-stick coating. For example, patent document CN201888715U discloses a cookware container with anti-scaling properties. The inner surface of the container is coated with at least one anti-scaling layer, which is a silicone resin coating. The silicone resin coating has low surface hardness and strength, is not resistant to metal scraping, and is easily scratched and damaged. Its easy-to-clean effect is lost as the non-stick coating fails.

[0003] Therefore, existing non-stick coatings have the following deficiencies:

[0004] 1. The non-stick surface has poor durability under high temperature and high humidity (such as stir-frying, shovels, steel wool and other kitchen cooking habits), and the easy-to-clean effect is easily lost;

[0005] 2. Organic coatings are prone to the risk of dry burning and high-temperature volatilization, which can be toxic and harmful. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides a treatment method for improving the cleanability of the surface of cookware.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] A method for improving the cleanability of a cookware surface comprises the following steps:

[0009] Mixing the easy-to-clean powder with the metal-coated powder to obtain a composite powder;

[0010] Processing the composite powder onto the surface of the cookware so that the metal coating material covering the surface of the cookware melts and covers the easy-clean material to obtain an easy-clean layer;

[0011] Performing penetration modification of the sealing material on the surface of the easy-clean layer and forming a film layer on the surface of the easy-clean layer;

[0012] The film layer is ground to expose the easy-to-clean powder.

[0013] As a preferred solution, the easy-to-clean powder is a powder with a surface free energy lower than 40 or a self-lubricating powder.

[0014] As a preferred solution, the easy-to-clean powder is selected from a combination of one or more of graphite, carbon particles, silicon nitride, silicon carbide, metallic silicon, silicon oxide, hexagonal boron nitride, yttrium oxide, and zirconium oxide.

[0015] As a preferred solution, the particle size of the easy-to-clean powder is 100-500 mesh.

[0016] As a preferred solution, the metal-coated powder is selected from titanium, silver, copper, molybdenum or iron.

[0017] As a preferred solution, the weight ratio of the easy-to-clean powder to the metal-coated powder is 1:(2-6).

[0018] As a preferred solution, the composite powder is processed onto the surface of the cookware by thermal spraying or cladding.

[0019] As a preferred solution, the sealing material is silica sol, titanium sol or zirconium sol.

[0020] As a preferred solution, the surface free energy of the sealing material is lower than 40.

[0021] As a preferred solution, the thickness of the film layer is less than 5 μm.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The treatment method for improving the cleanability of the surface of cookware of the present invention adopts a frame, an embedded structure and a riveted pin structure on the overall functional layer structure of the treated surface of the cookware, and the materials are selected from high strength and hardness, low surface free energy, low friction and low molecular weight.

[0024] The functional layer consists of three parts:

[0025] 1) The metal structure formed by the cladding material serves as a frame, providing the high hardness and strength required for scratch resistance;

[0026] 2) Embedded with easy-to-clean materials, it provides low surface free energy and low friction coefficient, is wear-resistant, and is non-stick and easy to clean;

[0027] 3) Sealing Materials: Penetrating the pores, forming a rivet structure to increase strength and provide corrosion resistance, preventing pitting and structural damage caused by expansion pressure during heating after solution penetration. Furthermore, using low surface free energy materials to seal the pores can also provide an initial easy-to-clean effect.

[0028] The structural advantages of the cookware treated by the method of the present invention make the functional layer less susceptible to wear and tear. At the same time, the method changes the way the easy-clean material exists only on the surface, and also changes the phenomenon that only the surface has easy-clean properties. Even when the surface layer is worn, the newly exposed coating material can still provide easy-clean properties. In addition, the cookware is non-toxic and harmless during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of a functional layer on the surface of a cooker obtained by a method for improving the cleanability of the surface of a cooker according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] To more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive efforts.

[0031] The method for improving the cleanability of the surface of cookware according to an embodiment of the present invention comprises the following steps:

[0032] (1) The easy-to-clean powder and the metal-coated powder are mixed in a weight ratio of 1:(2-6) to obtain a composite powder; specifically, the easy-to-clean powder is a powder having a surface free energy lower than 40 or a self-lubricating powder, for example, a combination of one or more of graphite, carbon particles, silicon nitride, silicon carbide, metallic silicon, silicon oxide, hexagonal boron nitride, yttrium oxide, and zirconium oxide. In addition, the following aspects can be considered in the selection of the easy-to-clean powder:

[0033] 1. The surface free energy should be lower than 40. The surface energy of most metals is above 40, such as copper 44 and iron 46.

[0034] Second, it is electrically neutral as a whole, not prone to static electricity, not prone to hydrogen bond receptors, etc.;

[0035] 3. Process the material into ultrafine powder with a particle size of 100-500 mesh to promote the thickening of the crystal double layer and reduce the surface energy;

[0036] 4. Pseudo-hexagonal layered crystal structure materials such as graphite and boron nitride have self-lubricating properties and reduce the friction coefficient.

[0037] The metal-coated powder is selected from titanium, silver, copper, molybdenum or iron.

[0038] (2) Processing the composite powder onto the surface of the cookware so that the metal coating material covering the surface of the cookware melts and covers the easy-to-clean material to obtain an easy-to-clean layer. Specifically, the composite powder is processed onto the surface of the cookware by thermal spraying or cladding. The surface metal melts but still maintains its basic structure, and the coating material on the outer surface melts, so that the powder particles and the substrate, and the powder particles and the powder particles are bonded to each other to form a strong structural framework; the powder particles on the inner surface are protected, which inhibits the gasification of the material caused by excessive temperature, and at the same time reduces the problem of excessive oxidation when exposed to air at high temperature; so that the easy-to-clean powder is evenly dispersed in the overall structure.

[0039] (3) The surface of the easy-to-clean layer is modified by infiltration of a sealing material, and a film layer is formed on the surface of the easy-to-clean layer. Specifically, a sealing material such as silica sol, titanium sol, or zirconium sol is used to seal and modify the surface of the easy-to-clean layer, infiltrate the pores, form a rivet pin structure, and form a thin film structure (i.e., a film layer) with a thickness of less than 5 μm.

[0040] (4) Grind the film layer to remove excess sol to expose the coated easy-to-clean powder.

[0041] like Figure 1 As shown, a non-stick layer is formed on the surface of a cooker 0 through the processing method of an embodiment of the present invention, including a coated metal material 1, a coated easy-to-clean material 2 and a sealing material 3.

[0042] Comparison of hardness and strength between the non-stick layer of the embodiment of the present invention and the traditional polytetrafluoroethylene non-stick layer:

[0043] 1. The hardness should be increased by more than 5 times, and the strength should be increased by more than 10 times.

[0044] 2. PTFE, the most widely used non-stick coating in the industry, has a Vickers hardness of approximately 20 HV and a compressive strength of approximately 130 MPa at 25°C, dropping to approximately 30 MPa at 200°C and becoming toxic above 400°C. The present invention utilizes a metal frame structure with a hardness and compressive strength that exceeds that of the original material, significantly exceeding that of the resin used in the PTFE coating. For example, the titanium alloy coating material used has a Vickers hardness of 300 HV or higher and a compressive strength of 400 MPa or higher, maintaining mechanical properties below 600°C. Its hardness is 15 times higher, and its compressive strength at 200°C is 13 times higher.

[0045] The treatment method for improving the cleanability of the surface of cookware of the present invention adopts a frame, an embedded structure and a riveted pin structure on the overall functional layer structure of the treated surface of the cookware, and the materials are selected from high strength and hardness, low surface free energy, low friction and low molecular weight.

[0046] The functional layer consists of three parts:

[0047] 1) The metal structure formed by the cladding material serves as a frame, providing the high hardness and strength required for scratch resistance;

[0048] 2) Embedded with easy-to-clean materials, it provides low surface free energy and low friction coefficient, is wear-resistant, and is non-stick and easy to clean;

[0049] 3) Sealing Materials: Penetrating the pores, forming a rivet structure to increase strength and provide corrosion resistance, preventing pitting and structural damage caused by expansion pressure during heating after solution penetration. Furthermore, using low surface free energy materials to seal the pores can also provide an initial easy-to-clean effect.

[0050] The structural advantages of the cookware treated by the method of the present invention make the functional layer less susceptible to wear and tear. At the same time, the method changes the way the easy-clean material exists only on the surface, and also changes the phenomenon that only the surface has easy-clean properties. Even when the surface layer is worn, the newly exposed coating material can still provide easy-clean properties. In addition, the cookware is non-toxic and harmless during use.

[0051] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, based on the ideas provided by the present invention, there may be changes in the specific implementation methods, and these changes should also be considered as the scope of protection of the present invention.

Claims

1. A method for improving the cleanability of a cookware surface, characterized in that: The following steps are involved: Mixing the easy-to-clean powder with the metal-coated powder to obtain a composite powder; The easy-to-clean powder has a surface free energy lower than 40 J / m 2 The method comprises the following steps: preparing a powder or self-lubricating powder; processing the composite powder onto the surface of the cookware so that the metal coating material covering the surface of the cookware melts and covers the easy-clean material to obtain an easy-clean layer; wherein the surface metal melts but still maintains the basic structure, and the coating material on the outer surface melts, so that the powder particles and the substrate, and the powder particles and the powder particles are bonded to each other to form a strong structural framework; performing infiltration modification of the sealing material on the surface of the easy-clean layer, and forming a film layer on the surface of the easy-clean layer; and grinding the film layer to expose the easy-clean powder.

2. A method for improving the cleanability of a cookware surface according to claim 1, characterized in that: The easy-to-clean powder is selected from one or more combinations of graphite, carbon particles, silicon nitride, silicon carbide, metallic silicon, silicon oxide, hexagonal boron nitride, yttrium oxide, and zirconium oxide.

3. The method for improving the cleanability of the surface of cookware according to claim 1, characterized in that: The particle size of the easy-to-clean powder is 100-500 meshes.

4. A method for improving the cleanability of a cookware surface according to claim 1, characterized in that: The metal-coated powder is selected from titanium, silver, copper, molybdenum or iron.

5. The method for improving the cleanability of the surface of cookware according to claim 1, characterized in that: The weight ratio of the easy-to-clean powder to the metal-coated powder is 1:(2-6).

6. The method for improving the cleanability of the surface of cookware according to claim 1, characterized in that: The method of processing the composite powder onto the surface of the cookware is thermal spraying or cladding.

7. The method for improving the cleanability of the surface of cookware according to claim 1, characterized in that: The sealing material is silica sol, titanium sol or zirconium sol.

8. A method for improving the cleanability of a cookware surface according to claim 7, characterized in that: The surface free energy of the sealing material is lower than 40 J / m 2 .

9. The method for improving the cleanability of the surface of cookware according to claim 1, characterized in that: The thickness of the film layer is less than 5 μm.

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