A multi-coated non-stick pan and its manufacturing method

Abstract

A multi-coated non-stick pan comprises a non-stick pan body, the inner surface of which is covered with a primer, a mid-coat, a topcoat and a water-based paint surface layer bonded in sequence, wherein the primer, mid-coat and topcoat are fluoropolymer resins with successively decreasing melt viscosities, and the water-based paint surface layer is a composition based on a fluoropolymer resin and a pigment.

Description

Technical Field

[0001] The present invention relates to the field of non-stick pans, and in particular to a multi-coated non-stick pan and a manufacturing method thereof. Background Art

[0002] The key technical challenge in existing non-stick pans lies in achieving non-stick properties. The bonding strength between the non-stick coating and the container itself is inversely proportional to the polyfluororesin content, while the coating's non-stick properties are directly proportional to the polyfluororesin content. Applying high levels of polytetrafluoroethylene directly to the container itself can easily cause the coating to peel, severely impacting its lifespan.

[0003] Prior art, such as application No. 200810162349.X, discloses a non-stick coating with wear and corrosion resistance. Specifically, it comprises an anti-corrosion base layer, a wear-resistant intermediate layer, and a non-stick top layer. The base layer comprises a fluoropolymer, at least one heat-resistant polymer binder, and pigments and fillers, with the pigments and fillers and the heat-resistant polymer binder comprising 1% to 15% by weight. The intermediate layer, applied on the base layer, comprises a fluoropolymer and inorganic filler particles. The top layer, applied on the intermediate layer, comprises a non-stick fluoropolymer. The pigment layer is positioned above the base layer to display the bottom pattern of the non-stick pan. While this technical solution effectively protects the pigment layer, its location between the container and the intermediate coating blocks direct contact between the two, making it susceptible to detachment due to weak adhesion. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a multi-coated non-stick pan and a method for manufacturing the same:

[0005] A multi-coated non-stick pan comprises a non-stick pan body, the inner surface of the non-stick pan body being covered with a primer, a mid-coat, a topcoat and a water-based paint surface layer bonded in sequence, the melt viscosities of the primer, mid-coat and topcoat decreasing in sequence, the primer, mid-coat and topcoat all comprising a fluoropolymer resin, and the water-based paint surface layer being a composition based on a fluoropolymer resin and a pigment.

[0006] Preferably, the non-stick pan includes an aluminum base layer, the inner surface of the aluminum base layer is covered with an inner metal mesh, a plurality of grid grooves are provided in the inner metal mesh, the grid grooves are covered with a primer layer bonded to the aluminum base layer, the surface of the inner metal mesh and the primer layer are covered with a middle coating layer, and the outer surface of the middle coating layer covers or is flush with the outer end surface of the inner metal mesh. Aluminum materials have the effects of being light and having strong thermal conductivity, but aluminum materials are prone to affect human health. This technical solution uses aluminum as the base material, but due to the coverage of the iron metal mesh and the middle coating layer and the top coating layer, it does not directly contact the food on the basis of sufficient aluminum material.

[0007] Preferably, the inner metal mesh is covered with a corresponding outer ferrous metal mesh, the outer diameter of the mesh wires of the outer ferrous metal mesh being larger than the outer diameter of the mesh wires of the inner metal mesh, the mesh wires of the outer ferrous metal mesh being parallel to and corresponding to the mesh wires of the inner metal mesh, and the notches of the mesh grooves forming a narrow structure with a small outside and a large inside. Existing technologies employ a method of sandblasting the inner surface of a non-stick pan to form an uneven groove structure on the inner surface of the pan bottom substrate, and then adhering a coating to improve the degree of adhesion between the coating and the inner surface of the non-stick pan. Although the above technical solution can improve the adhesion between the coating and the inner surface of the non-stick pan by increasing the connection area between the coating and the inner surface of the non-stick pan, the degree of improvement is limited due to the lack of a limiting force on the vertical surface. The present application uses a double screen printing superposition method. Since the outer diameter of the mesh wire of the outer iron metal mesh is larger than the outer diameter of the mesh wire of the inner metal mesh, the outer iron metal mesh area forms an outward bulge relative to the inner metal mesh. Therefore, the slot diameter of the outer iron metal mesh is smaller than the slot diameter of the inner metal mesh. Therefore, a narrow structure with a small outside and a large inside is formed for the grid slot, so that the mesh wire of the outer iron metal mesh directly produces a limiting force perpendicular to the aluminum base layer on the coating, greatly improving the corresponding adhesion.

[0008] Preferably, the inner metal mesh has a square cross-section, and the outer ferrous metal mesh comprises an upper arc segment and a lower horizontal segment. The arc segment is an outwardly convex arc structure, and the horizontal segment is fixedly connected to the upper end of the inner metal mesh. The horizontal segment corresponds to a wider horizontal area than the upper end of the inner metal mesh. A right angle is formed at the junction of the horizontal segment and the inner metal mesh, thereby improving the adhesion and fixation effect.

[0009] Preferably, the outer surface of the primer layer is lower than the lower end surface of the outer ferrous metal mesh, and the outer surface of the middle coating layer is flush with the outer surface of the outer ferrous metal mesh.

[0010] Preferably, the fluoropolymer resin contains polytetrafluoroethylene (PTFE), with the PTFE content of the primer, midcoat, and topcoat increasing in sequence. The bonding strength between the non-stick coating and the container body is inversely proportional to the PTFE content, while the coating's non-stick properties are directly proportional to the PTFE content. Applying high levels of PTFE directly to the container body can easily cause the coating to fall off, severely impacting its service life. The layer-by-layer approach employed in this application significantly improves bonding.

[0011] Preferably, the topcoat layer comprises polytetrafluoroethylene, titanium dioxide, and a binder, wherein the weight percentage of polytetrafluoroethylene is higher than the weight percentage of titanium dioxide. Conventional polytetrafluoroethylene coatings cannot increase the polyfluororesin content due to poor adhesion to the container body. However, since the topcoat layer directly contacts the midcoat layer, the present technical solution can increase the polytetrafluoroethylene content, thereby improving the non-stick properties.

[0012] Preferably, the pot further comprises a pot handle, which is in an arc-shaped strip structure, and the surface of the pot handle is covered with a heat-insulating sleeve, which is made of elastic silicone material.

[0013] Preferably, the surface of the thermal insulation sleeve is provided with a plurality of axially distributed anti-slip toothed rings, each of which has a spiral ring structure and is inclined and convex toward the non-stick pan body, thereby providing a corresponding anti-slip effect and preventing the pan handle from sliding axially and circumferentially. Due to the spiral ring structure, the anti-slip toothed ring can provide a corresponding circumferential freedom limiting function.

[0014] A method for manufacturing a multi-coated non-stick pan comprises the following steps:

[0015] (1) Casting; according to the ratio of the chemical components in the aluminum alloy material, the required raw materials are calculated and weighed, the raw materials are mixed, smelted, and die-cast to obtain a pot blank;

[0016] (2) First screen printing: The surface of the pot blank is first cleaned and smoothed, a primer is sprayed, and the first screen printing is performed in sequence. The first screen printing is a process of embedding the inner metal screen on the inner surface of the non-stick pot;

[0017] (3) Second screen printing: spraying the first intermediate coating, screen printing the second intermediate coating, spraying the top coating, and spraying the water-based paint top layer on the inner surface of the non-stick pan in sequence to obtain a finished non-stick pan.

[0018] Beneficial effects: First, the primer, mid-coat and top-coat in the present application are fluorine-containing polymer resins with successively decreasing melt viscosities, forming a perfect transition. The three are highly bonded and are not easily detached from each other.

[0019] Second, this application adopts a multi-coating design, the coating is not easily damaged and the non-stick effect is longer.

[0020] Third, the water-based paint covers the topcoat, which reduces the direct volatilization of the topcoat and improves the bonding between the middle coat and the topcoat, thus avoiding the topcoat from falling off due to the isolation of the water-based paint surface layer between the topcoat and the middle coat. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the embodiment.

[0022] Figure 2 Schematic top view of an embodiment.

[0023] Figure 3 It is a cross-sectional schematic diagram of an embodiment.

[0024] Figure 4 for Figure 3A is an enlarged schematic diagram.

[0025] Figure 5 for Figure 3 Enlarged schematic diagram of point B in FIG.

[0026] Figure numerals: 1. Non-stick pan body; 11. Aluminum base layer; 2. Primer layer; 3. Middle coat layer; 4. Top coat layer; 5. Water-based paint surface layer; 6. Inner metal mesh; 61. Grid groove; 7. Outer iron metal mesh; 71. Arc line segment; 72. Horizontal line segment; 8. Pan handle; 9. Insulation sleeve; 10. Anti-slip gear ring. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-5 The present invention is further illustrated with examples.

[0028] Example: Figure 1 As shown, a multi-coated non-stick pan includes a non-stick pan body 1 and a pan handle 8. The pan handle 8 is an arc-shaped strip structure, and its surface is covered with an insulating sleeve 9 made of elastic silicone. The surface of the insulating sleeve 9 is provided with multiple axially distributed anti-slip toothed rings 10. The anti-slip toothed rings 10 have a spiral ring structure and are inclined and protruding toward the non-stick pan body 1, providing a corresponding anti-slip effect and preventing axial and circumferential sliding of the pan handle 8. Due to the spiral ring structure of the anti-slip toothed rings 10, they can provide a corresponding circumferential degree of freedom limiting function.

[0029] like Figure 4 As shown, the inner surface of the non-stick pan body 1 is covered with a primer 2, a mid-coat 3, a topcoat 4 and a water-based paint surface layer 5 bonded in sequence. The melt viscosity of the primer (2), mid-coat (3) and topcoat (4) decreases in sequence. The primer (2), mid-coat (3) and topcoat (4) all include fluoropolymer resins. The water-based paint surface layer 5 is a composition based on fluoropolymer resins and pigments. The non-stick pan includes an aluminum base 11, the inner surface of the aluminum base 11 is covered with an inner metal mesh 6, the inner metal mesh 6 is provided with a plurality of grid grooves 61, the grid grooves 61 are covered with a primer 2 bonded to the aluminum base 11, the surfaces of the inner metal mesh 6 and the primer 2 are covered with a mid-coat 3, the outer surface of the mid-coat 3 covers the outer end surface of the inner metal mesh 6. The outer surface of the primer 2 is lower than the lower end surface of the outer iron metal mesh 7, and the outer surface of the mid-coat 3 is flush with the outer surface of the outer iron metal mesh 7.

[0030] Aluminum materials are lightweight and have strong thermal conductivity, but they are also susceptible to adverse effects on human health. This technical solution uses aluminum as the base material, but due to the coverage of the iron metal mesh and the middle coating 3 and top coating 4, it does not directly contact the food despite being fully aluminum. The inner metal mesh 6 described in this application can be made of a material other than aluminum. The inner metal mesh 6 is covered with a corresponding outer iron metal mesh 7. The outer diameter of the mesh wires of the outer iron metal mesh 7 is larger than the outer diameter of the mesh wires of the inner metal mesh 6. The mesh wires of the outer iron metal mesh 7 are parallel to the mesh wires of the inner metal mesh 6, and the notches of the mesh slots 61 form a narrow structure with a small outside and a large inside. In existing technologies, the inner surface of a non-stick pan is sandblasted to form an uneven groove structure on the inner surface of the pan base, and then a coating is adhered to improve the adhesion between the coating and the inner surface of the non-stick pan. Although the above technical solution can improve the adhesion between the coating and the inner surface of the non-stick pan by increasing the connection area between the coating and the inner surface of the non-stick pan, the improvement is limited because the solution lacks a limiting force on the vertical surface. The present application uses a double screen printing superposition method. Since the outer diameter of the mesh wire of the outer ferrous metal mesh 7 is larger than the outer diameter of the mesh wire of the inner metal mesh 6, the outer ferrous metal mesh 7 area is bulged outward relative to the inner metal mesh 6. Therefore, the slot diameter of the outer ferrous metal mesh 7 is smaller than the slot diameter of the inner metal mesh 6. Therefore, a narrow structure with a small outside and a large inside is formed on the grid slot 61, so that the mesh wire of the outer ferrous metal mesh 7 directly generates a limiting force perpendicular to the aluminum base layer 11 on the coating, thereby greatly improving the corresponding adhesion.

[0031] like Figure 4 As shown, the inner metal mesh 6 has a square cross-section, while the outer ferrous metal mesh 7 comprises an upper arcuate segment 71 and a lower horizontal segment 72. The arcuate segment 71 is an outwardly convex arc, while the horizontal segment 72 is fixedly connected to the upper end of the inner metal mesh 6. The horizontal plane corresponding to the horizontal segment 72 is wider than the upper end of the inner metal mesh 6. A right angle is formed at the junction of the horizontal segment 72 and the inner metal mesh 6, enhancing the adhesion and fixation effect.

[0032] The fluoropolymer resin contains polytetrafluoroethylene, and the polytetrafluoroethylene content in the base coating 2, the middle coating 3, and the top coating 4 increases in sequence. The bonding force between the non-stick coating and the container body is inversely proportional to the content of the polyfluoro resin, while the non-stick performance of the coating is proportional to the content of the polyfluoro resin. If a high content of polytetrafluoroethylene is directly applied to the container body, it is easy to cause the coating to fall off, seriously affecting its service life. The layer-by-layer progressive method adopted in this application significantly improves its bonding. The top coating 4 includes polytetrafluoroethylene, titanium dioxide and an adhesive, wherein the mass percentage content of polytetrafluoroethylene is higher than the mass percentage content of titanium dioxide. Conventional polytetrafluoroethylene coatings cannot increase the content of polyfluoro resin due to the bonding problem between the container body, but the present technical solution can increase the corresponding polytetrafluoroethylene content because the top coating 4 is in direct contact with the middle coating 3, thereby improving the corresponding non-stickiness.

[0033] A method for manufacturing a multi-coated non-stick pan comprises the following steps:

[0034] (1) Casting: According to the ratio of the chemical components in the aluminum alloy material, the required raw materials are calculated and weighed, and the raw materials are mixed, melted, and die-cast to obtain a pot blank.

[0035] (2) First screen printing: The surface of the pot blank is first cleaned and smoothed, a primer layer 2 is sprayed, and the first screen printing is performed. The first screen printing is a process of embedding the inner metal mesh 6 on the inner surface of the non-stick pot.

[0036] (3) Second screen printing: spraying the first intermediate coating 3, screen printing the second intermediate coating 3, spraying the top coating 4, and spraying the water-based paint top layer 5 on the inner surface of the non-stick pan in sequence to obtain a finished non-stick pan.

[0037] Obviously, the above embodiments of the present invention are merely examples for the purpose of illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to provide an exhaustive list of implementations. However, obvious variations or modifications arising from the essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A multi-coated non-stick pan, comprising a non-stick pan body (1), characterized in that: The inner surface of the non-stick pan body (1) is covered with a primer (2), a middle coating (3), a top coating (4) and a water-based paint surface layer (5) bonded in sequence, the melt viscosities of the primer (2), the middle coating (3) and the top coating (4) decreasing in sequence, the primer (2), the middle coating (3) and the top coating (4) all comprising a fluoropolymer resin, and the water-based paint surface layer (5) is a composition based on a fluoropolymer resin and a pigment; the non-stick pan comprises an aluminum base layer (11), the inner surface of the aluminum base layer (11) is covered with an inner metal mesh (6), a plurality of grid grooves (61) are provided in the inner metal mesh (6), the grid grooves (61) are covered with a primer (2) bonded to the aluminum base layer (11), the surfaces of the inner metal mesh (6) and the primer (2) are covered with a middle coating (3), the middle coating (3) The outer surface of the inner metal mesh (6) is covered or flush with the outer end surface of the inner metal mesh (6); the upper portion of the inner metal mesh (6) is covered with an outer iron metal mesh (7) corresponding thereto, the outer diameter of the mesh wire of the outer iron metal mesh (7) is greater than the outer diameter of the mesh wire of the inner metal mesh (6), the mesh wire of the outer iron metal mesh (7) is parallel to the mesh wire of the inner metal mesh (6), and the notch of the grid slot (61) forms a narrow structure with a small outside and a large inside; the cross section of the inner metal mesh (6) is a square structure, the cross section of the outer iron metal mesh (7) is composed of an upper arc segment (71) and a lower horizontal segment (72), the arc segment (71) is an outwardly protruding arc structure, the horizontal segment (72) is fixedly connected to the upper end of the inner metal mesh (6), and the width of the horizontal plane area corresponding to the horizontal segment (72) is greater than the upper end of the inner metal mesh (6).

2. The multi-coated non-stick pan according to claim 1, characterized in that: The outer surface of the base coating (2) is lower than the lower end surface of the outer ferrous metal mesh (7), and the outer surface of the middle coating (3) is flush with the outer surface of the outer ferrous metal mesh (7).

3. The multi-coated non-stick pan according to claim 1, characterized in that: The fluorine-containing polymer resin contains polytetrafluoroethylene, and the polytetrafluoroethylene content in the primer (2), the middle coating (3) and the top coating (4) increases in sequence.

4. The multi-coated non-stick pan according to claim 3, characterized in that: The topcoat layer (4) comprises polytetrafluoroethylene, titanium dioxide and an adhesive, wherein the mass percentage content of the polytetrafluoroethylene is higher than the mass percentage content of the titanium dioxide.

5. The multi-coated non-stick pan according to claim 1, characterized in that: The invention also comprises a pot handle (8), wherein the pot handle (8) is an arc-shaped strip structure, and the surface of the pot handle (8) is covered with a heat-insulating sleeve (9), and the heat-insulating sleeve (9) is made of elastic silicone material.

6. The multi-coated non-stick pan according to claim 5, characterized in that: The surface of the heat-insulating sleeve (9) is provided with a plurality of axially distributed anti-slip toothed rings (10), the anti-slip toothed rings (10) are in a spiral ring structure, and the anti-slip toothed rings (10) are inclined and convex toward the non-stick pan body (1).

7. A method for manufacturing a non-stick pan according to any one of claims 1 to 6, comprising the following steps: (1) Casting; according to the ratio of the chemical components in the aluminum alloy material, the required raw materials are calculated and weighed, the raw materials are mixed, smelted, and die-cast to obtain a pot blank; (2) First screen printing: the surface of the pot blank is first cleaned and smoothed, a primer layer (2) is sprayed, and the first screen printing is performed, wherein the first screen printing is a process of printing and embedding the inner metal mesh (6) on the inner surface of the non-stick pot; (3) Second screen printing: spraying the first intermediate coating (3), screen printing and the second intermediate coating (3), spraying the top coating (4), and spraying the water-based paint top layer (5) on the inner surface of the non-stick pan in sequence to obtain a finished non-stick pan.

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