CN111760772A - Method for realizing local coating of paint on surface of metal cooking utensil and product - Google Patents
Method for realizing local coating of paint on surface of metal cooking utensil and product Download PDFInfo
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- CN111760772A CN111760772A CN202010640712.5A CN202010640712A CN111760772A CN 111760772 A CN111760772 A CN 111760772A CN 202010640712 A CN202010640712 A CN 202010640712A CN 111760772 A CN111760772 A CN 111760772A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/02—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
- A47J36/025—Vessels with non-stick features, e.g. coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
- B05D3/0272—After-treatment with ovens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/107—Post-treatment of applied coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
- B21D51/22—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like pots, e.g. for cooking
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F3/00—Brightening metals by chemical means
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- ing And Chemical Polishing (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a method for realizing local coating on the surface of a metal cooking appliance, which comprises the following steps: s1, coating photosensitive resist diluted by alcohol on the surface of the metal plate, drying, exposing and developing to form a preset pattern, baking to form a hard film, S2, chemically etching the surface of the exposed metal plate by an etching agent through spraying, and forming a concave-convex pattern on the surface of the metal plate; s3, spraying a plurality of prepared coatings to the whole surface of the metal plate obtained by the S2 treatment; s4, sintering and film stripping treatment is carried out on the metal plate coated with the coating through a plurality of temperature zones; s5, performing chemical polishing on the metal plate obtained in the step S4, and removing yellow marks and/or an oxide layer formed by sintering; s6, pressing the metal plate material obtained in S5 into a shape required by the cooking utensil to obtain the metal cooking utensil with the surface partially coated with the coating. The invention does not need the step of removing the non-stick layer on the raised surface by mechanical polishing, thereby effectively protecting the non-stick performance of the coating.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the field of cooking appliances, and particularly relates to a method for locally coating a coating on the surface of a metal cooking appliance and a product.
[ background of the invention ]
In order to realize the non-stick function, aluminum alloy and stainless steel cookers on the market generally adopt a method of completely coating the surface with non-stick paint, or processing a plurality of concave-convex patterns on the surface, and removing the coating layer of the convex part and exposing the metal layer by a mechanical method after completely coating the paint, so as to realize the local coating of the non-stick paint. The food is suspended in the concave-convex texture to generate the steam anti-sticking film in the cooking process, so that the food not only has a reduced contact surface and is effectively anti-sticking, but also has a relatively longer service life, and is more popular in the market.
The non-stick cookware partially coated with non-stick paint is made by a method disclosed in patent CN103142132A, and comprises the following steps: a. surface pattern treatment: forming concave-convex lines with preset patterns in a preset area on the surface of the stainless steel plate by a chemical etching or engraving or rolling method; b. and (3) stretching and forming: stretching and forming the stainless steel plate into a pot body, and enabling the preset area to be located in the working area in the formed pot body; c. spraying non-stick paint: spraying non-stick paint on a preset area of the inner surface of the pot body to enable the preset area of the inner surface of the pot body to be coated with the non-stick coating; d. polishing: and mechanically polishing the preset area of the inner surface of the pot body, removing the non-stick coating on the convex surface in the concave-convex grains, and keeping the non-stick coating on the concave surface in the concave-convex grains.
However, the manufacturing method has the defects that the non-stick layer on the raised surface needs to be removed through mechanical polishing, the coating is easy to damage in the polishing process, the non-stick performance is reduced, meanwhile, the working procedure processing time is long, the polishing is easy to be uneven, the energy consumption is large, and the cost is high.
[ summary of the invention ]
The invention provides a method and a product for realizing local coating of paint on the surface of a metal cooking utensil, which do not need the step of removing a non-stick layer on a convex surface by mechanical polishing and effectively protect the non-stick performance of the coating.
The technical solution of the invention is as follows:
a method for achieving a localized application of a coating on the surface of a metal cooking appliance, comprising the steps of:
s1, coating the photosensitive resist diluted by alcohol on the surface of the metal plate, drying, exposing and developing to form a preset pattern, baking to harden:
s2, chemical etching is carried out on the surface of the exposed metal plate by spraying etching agent, and a concave-convex pattern is formed on the surface of the metal plate;
s3, spraying a plurality of prepared coatings to the whole surface of the metal plate obtained by the S2 treatment;
s4, the metal plate coated with the paint is subjected to film stripping treatment by a sintering procedure comprising the following temperature zones: an initial volatilization section T1 for volatilizing the water and volatile substances in the coating; in the second high-temperature sintering section T2, the coating layer is solidified, and the photosensitive adhesive layer is sintered and coked; the three-region crosslinking stabilizing section T3 is used for enabling organic matters in the coating to form crosslinking so as to ensure that the coating is firmly connected with the matrix; the four-section low-temperature cooling section T4 is expanded with heat and contracted with cold to peel off the coked photosensitive adhesive layer;
s5, performing chemical polishing on the metal plate obtained in the step S4, and removing yellow marks and/or an oxide layer formed by sintering;
s6, pressing the metal plate material obtained in S5 into a shape required by the cooking utensil to obtain the metal cooking utensil with the surface partially coated with the coating.
Further, in S1, the dilution volume ratio of alcohol to photosensitive glue is (0.8-1.15): 1, the drying temperature of the photosensitive glue is 80-90 ℃, the drying time of the photosensitive glue is 15-30 minutes, the exposure time is 60-120 seconds, the developing agent formed by industrial sodium carbonate solution is used for developing, the developing temperature is 30-45 ℃, the baking hardening temperature is 135-180 ℃, and the time is 15-25 minutes.
Further, the step S1 is to set a predetermined pattern by a negative exposure developing method.
Further, in the S4, the initial volatilization section T1 in the first zone is 150-300 ℃; the second-zone high-temperature sintering section T2 is 420-480 ℃; the three-region cross-linking stable section T3 is 350-420 ℃; the four-zone low-temperature cooling section T4 is formed by strongly cooling air at room temperature to below 60 ℃ (60 ℃ inclusive).
Further, in the step S3, the plurality of coatings comprise a primer coating and a surface coating, the primer coating is dried at a drying temperature of 125-150 ℃, the surface coating is sprayed, and the surface coating is directly sintered after being sprayed.
Further, in the S4, the initial volatilization section T1 in the first zone is 260-270 ℃; the high-temperature sintering section T2 in the second area is 420-435 ℃; the three-region crosslinking stabilizing section T3 is 400-420 ℃; the four-zone low-temperature cooling section T4 is air-cooled to below 60 ℃ (including 60 ℃).
Further, in the step S2, the chemical etching is carried out until the roughness Ra is 0.8-6.3 and the etching depth is not more than 0.8 mm. When the sand surface effect is only made on the surface, the etching convex part can be flush with the surface of the non-etching metal.
Further, in the S2, the etching agent is ferric trichloride in a mass ratio of 1:10 (0.03-0.08): water: hydrochloric acid, the concentration of the solution is 38-40 DEG Be, the temperature of the solution is 30-45 ℃, and the spraying pressure is 1.2-2.8 kg/cm2。
Further, in the step S5, the chemical polishing solution is a mixed solution of sodium hydroxide and sodium nitrate, the total alkalinity is 18 to 35%, and the temperature is 90 to 110 ℃.
A metal cooking utensil with a topical coating, characterized in that it is prepared according to the above method.
The invention has the following beneficial effects:
1) according to the invention, the local coating is removed by stripping through a developing method, then the chemical polishing process is carried out, and the local unnecessary coating is removed through multi-temperature zone sintering, so that the situation that the non-stick layer on the metal surface is removed by using a physical method of mechanical polishing to realize the local coating effect of the concave-convex surface is avoided, the physical damage such as scraping, scratching, bumping and the like to the surface of the coating needing to be reserved is avoided, and the non-stick performance of the coating is effectively protected;
2) the invention adopts an exposure and development method to set the graph, has the graph precision of a photo level, can manufacture fine graph elements (points, lines and surfaces), and can reach the graph precision of 0.02 mm; meanwhile, the developing adhesive layer is reserved before spraying, so that the pattern precision of the sintered coating can be kept consistent with the developing pattern precision;
3) the invention adopts chemical etching to the exposed metal surface without coating photosensitive glue to form a compact and uniform concave-convex rough surface, the rough area is controllable, the roughness is uniform and consistent, the precision is higher, the sand blasting treatment (the sand blasting treatment also carries out rough treatment on the non-coating area to cause the difficulty of later-stage coating removal) is avoided, and the processing cost is reduced.
[ description of the drawings ]
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic side sectional view of the structure of the product before development in one step S1 of the embodiment;
FIG. 3 is a schematic side sectional view of the structure of the product after development in one step S1 of the example;
FIG. 4 is a schematic side sectional view of a structure of a product obtained in one step S2 of the embodiment;
FIG. 5 is a schematic side sectional view of a structure of a product obtained in one step S3 of the embodiment;
fig. 6 is a schematic side sectional view of the structure of the product obtained in one step S4 of the embodiment.
Description of the labeling: 1, a metal plate; 2, exposing a pattern area; 3, a non-exposed pattern area; 7, a photosensitive adhesive layer; 8, concave-convex rough surface; 9, etching the area coating; 10, coating above the photosensitive adhesive layer.
[ detailed description ] embodiments
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
A process for realising the topical application of a coating on the surface of a metal cooking utensil, as shown in figure 1, comprising the following steps:
s1, coating the photosensitive resist diluted by alcohol on the surface of a metal plate, drying, exposing and developing to form a preset pattern, baking at 135-180 ℃ to harden the film: the dilution volume ratio of alcohol to the photosensitive glue is (0.8-1.15): 1, the drying temperature of the photosensitive glue is 83-87 ℃, the drying time of the photosensitive glue is 15-30 minutes, the exposure time is 60-120 seconds, the developing agent formed by industrial soda solution is adopted for development, the developing temperature is 30-45 ℃, and the baking hardening time is 15-25 minutes. Preferably, the preset pattern can be set by a negative exposure and development method, the pattern precision of a photo level can be achieved, fine pattern elements (points, lines and surfaces) can be manufactured, and the pattern precision can reach 0.02 mm; meanwhile, the developing adhesive layer is reserved before spraying, so that the pattern precision of the sintered coating can be kept consistent with the developing pattern precision.
And S2, chemically etching the surface of the exposed metal plate by spraying etching agent. Ferric chloride of etching agent: water: the mass ratio of the hydrochloric acid is 1:10 (0.03-0.08), the solution concentration is 38-40 DEG Be, the solution temperature is 30-45 ℃, and the spraying pressure is 1.2-2.8 kg/cm2The surface of the bare metal plate can be etched to the roughness Ra0.8-Ra6.3 by adjusting the proportion of the medicament and the spraying pressure, and the etching depth is not more than 0.8 mm.
And S3, spraying a plurality of prepared coatings on the whole surface of the metal plate obtained by the S2 treatment. One or more coatings can be sprayed in sequence according to the performance requirement of the non-stick coating; in one embodiment, the plurality of coatings comprise a bottom coating and a surface coating, the drying temperature of the bottom coating is 125-150 ℃, the surface coating is sprayed after the bottom coating is dried, and the surface coating is fed into a sintering furnace after being sprayed. The coating can be selected from suitable commercial products according to functional requirements.
S4, the metal plate coated with the paint is subjected to film stripping treatment by a sintering procedure comprising the following temperature zones: an initial volatilization section T1 for volatilizing the water and volatile substances in the coating; in the second high-temperature sintering section T2, the coating layer is solidified, and the photosensitive adhesive layer is sintered and coked; the three-region crosslinking stabilizing section T3 enables organic matters in the coating to form crosslinking, and ensures that the coating is firmly connected with the matrix; and the four-section low-temperature cooling section T4 expands with heat and contracts with cold to peel off the coked photosensitive adhesive layer. The sintering temperature needs to be set according to different coatings, and in a certain embodiment, the sintering temperature is as follows: the initial volatilization section of the first zone is 260-270 ℃, the high-temperature sintering section of the second zone is 420-435 ℃, the coating layer is sintered and solidified, the photosensitive adhesive layer 7 is kept for sintering and coking, the cross-linking stable section of the third zone is 400-420 ℃, the furnace outlet is immediately and strongly air-cooled to about 60 ℃, the thermal expansion and the cold contraction are aggravated, and the peeling of the adhesive layer is promoted.
S5, performing chemical polishing on the metal plate obtained in the step S4, and removing yellow marks and/or oxide layers formed by sintering, wherein the chemical polishing process comprises the following steps: workpiece → chemical polishing → cleaning → nitric acid light extraction → cleaning → hot water soaking → air drying. The chemical polishing solution is prepared from sodium hydroxide and sodium nitrate, the total alkalinity is 18-35%, the temperature is 90-110 ℃, and the polishing time is 2-10 seconds.
S6, pressing the metal plate material obtained in S5 into a shape required by the cooking utensil to obtain the metal cooking utensil with the surface partially coated with the coating. The metal plate coated with the coating is extruded and molded by the hard metal convex-concave die, the coating is isolated between the die and the metal plate, so that the direct generation of adverse factors such as friction, collision and the like between the metal plate and the hard metal die is avoided, and after molding and demolding, the surface of the metal plate can be kept smooth without being repaired by mechanical methods such as polishing and the like; meanwhile, the extrusion of the die accelerates the stripping of the coating on the photosensitive adhesive layer.
The basic principle of the invention is as follows: coating a photosensitive adhesive layer (glue) on the surface of a smooth and clean metal plate, manufacturing a negative film according to a required pattern, exposing in a vacuum exposure machine, developing in a developing machine, utilizing a traditional film photographic dark box developing method to ensure that the photosensitive adhesive layer is reserved in an exposed pattern area on the surface of the metal plate, exposing the metal surface of the other area, chemically etching the exposed metal surface to ensure that the exposed metal forms a compact and uniform concave-convex rough surface, spraying a coating on the etched metal plate, sintering in a baking furnace after surface drying, adjusting the furnace temperature to 150-450 ℃, losing the adhesive force of the photosensitive adhesive layer reserved on the surface of the smooth metal plate at high sintering temperature, tightly combining the coating in the etched area with the concave-convex rough surface, easily removing the coating covering the exposed pattern area of the metal plate and reserving the coating above the photosensitive adhesive layer after the metal plate is taken out of the furnace to expose the smooth metal surface area, and chemically polishing the exposed metal surface, removing yellow marks, oxide layers and the like formed by sintering, pressing the metal plate into the shape required by the pan body, and manufacturing the metal cooking utensil with the required preset pattern area coated with the coating.
The following examples are not provided to limit the scope of the present invention, nor are the steps described to limit the order of execution, and the directions described are limited to the drawings. Modifications of the invention which are obvious to those skilled in the art in view of the prior art are also within the scope of the invention as claimed.
Example one
A method for achieving a topical application of a coating to a surface of a metal cooking appliance, comprising the steps of:
s1-1, sizing: coating a photosensitive adhesive layer on the surface of a smooth and clean metal plate 1, wherein the photosensitive adhesive is diluted by alcohol at a ratio of 0.8:1 to 1.15:1, the drying temperature is 83-87 ℃, and the drying time is 15-30 minutes;
s1-2, exposure: carrying out exposure in a vacuum exposure machine for 60-120 seconds;
s1-3, developing: developing in a developing machine, wherein a photosensitive adhesive layer is reserved in an exposed pattern area on the surface of a metal plate by using a traditional film photographic dark box developing method, the metal surfaces of other areas are exposed, and a developing agent (industrial sodium carbonate: water is about 1:10) is used at the developing temperature of 30-45 ℃;
s1-4, hardening: the baking temperature is 135-180 ℃, and the baking time is 15-25 minutes;
s2, chemical etching: an etching agent (ferric trichloride: water: hydrochloric acid in a mass ratio of 1:10 (0.03-0.08)), a solution concentration of 38-40 DEG Be, a solution temperature of 30-45 ℃, and a spray pressure of 1.2-2.8 kg/cm2The surface of the bare metal plate can be etched to the roughness Ra0.8-Ra6.3 by adjusting the proportion of the medicament and the spraying pressure, and the etching depth is not more than 0.8mm, so that the bare metal forms a compact and uniform concave-convex rough surface;
s3, spraying paint: the bottom coating and the surface coating can be sprayed in sequence; drying the bottom coating (sold in the market) at the temperature of 125-150 ℃, sequentially spraying the middle coating (sold in the market) and the surface coating (sold in the market) after drying the bottom coating, and sintering in a baking oven after surface drying;
s4, sintering and removing the film: the metal plate coated with the coating is subjected to film removing treatment by a sintering procedure comprising the following temperature zones: the initial volatilization section of the first zone is 180-200 ℃, the high-temperature sintering section of the second zone is 430-445 ℃, the coating layer is sintered and solidified, the photosensitive adhesive layer 7 is kept for sintering and coking, the cross-linking stable section of the third zone is 400-420 ℃, the furnace outlet is immediately and forcefully cooled to about 60 ℃ by air, and the expansion caused by heat and the contraction caused by cold are intensified; sintering at high temperature to make the photosensitive adhesive layer reserved on the surface of the smooth metal plate lose adhesive force, the coating in the etching area is tightly combined with the etched concave-convex rough surface, and the coating covering the exposed pattern area of the metal plate and reserved above the photosensitive adhesive layer can be easily removed after the metal plate is taken out of the furnace, so that the smooth metal surface area is exposed;
s5, chemical polishing: chemically polishing the exposed metal surface to remove yellow marks, oxide layers and the like formed by sintering; the chemical polishing process comprises the following steps: workpiece → chemical polishing → cleaning → nitric acid light extraction → cleaning → hot water soaking → drying, wherein the chemical polishing solution is made of sodium hydroxide and sodium nitrate, the total alkalinity is 18-35%, the temperature is 90-110 ℃, the polishing time is 2-10 seconds, the workpiece after chemical polishing needs to be cleaned by two flows of clean water, the water quality is kept clean, and the hot water soaking temperature is more than 80 ℃;
s6, press forming: and pressing the metal plate 1 obtained in the step S5 into a shape required by an appliance to obtain a metal pot body with the surface partially coated with the coating.
Example two
A method for achieving a topical application of a coating to a surface of a metal cooking appliance, comprising the steps of:
s1-1, sizing: coating a photosensitive adhesive layer on the surface of a smooth and clean metal plate 1, wherein the photosensitive adhesive is diluted by alcohol at a ratio of 0.8:1 to 1.15:1, the drying temperature is 83-87 ℃, and the drying time is 15-30 minutes;
s1-2, exposure: carrying out exposure in a vacuum exposure machine for 60-120 seconds;
s1-3, developing: developing in a developing machine, wherein a photosensitive adhesive layer is reserved in an exposed pattern area on the surface of a metal plate by using a traditional film photographic dark box developing method, the metal surfaces of other areas are exposed, and a developing agent (industrial sodium carbonate: water is about 1:10) is used at the developing temperature of 30-45 ℃;
s1-4, hardening: the baking temperature is 135-180 ℃, and the baking time is 15-25 minutes;
s2, chemical etching: an etching agent (ferric trichloride: water: hydrochloric acid ratio 1:10 (0.03-0.08)), a solution concentration of 38-40 DEG Be, a solution temperature of 30-45 ℃, and a spray pressure of 1.2-2.8 kg/cm2The surface of the bare metal plate can be etched to the roughness Ra0.8-Ra6.3 by adjusting the proportion of the medicament and the spraying pressure, and the etching depth is not more than 0.8mm, so that the bare metal forms a compact and uniform concave-convex rough surface;
s3, spraying paint: the bottom coating and the surface coating can be sprayed in sequence; drying the bottom coating (sold in the market) at 125-150 ℃, spraying the surface coating (sold in the market) after drying the bottom coating, drying the surface, and sintering in a baking furnace;
s4, sintering and removing the film: the metal plate coated with the coating is subjected to film removing treatment by a sintering procedure comprising the following temperature zones: the initial volatilization section of the first zone is 155-175 ℃, the high-temperature sintering section of the second zone is 435-445 ℃, the coating layer is sintered and solidified, the photosensitive adhesive layer 7 is kept for sintering and coking, the cross-linking stable section of the third zone is 380-390 ℃, the furnace outlet is immediately and forcefully cooled to about 60 ℃ by air, and the expansion caused by heat and the contraction caused by cold are intensified; sintering at high temperature to make the photosensitive adhesive layer reserved on the surface of the smooth metal plate lose adhesive force, the coating in the etching area is tightly combined with the etched concave-convex rough surface, and the coating covering the exposed pattern area of the metal plate and reserved above the photosensitive adhesive layer can be easily removed after the metal plate is taken out of the furnace, so that the smooth metal surface area is exposed;
s5, chemical polishing: chemically polishing the exposed metal surface to remove yellow marks, oxide layers and the like formed by sintering; the chemical polishing process comprises the following steps: workpiece → chemical polishing → cleaning → nitric acid brightening → cleaning → hot water soaking → drying, wherein the chemical polishing solution is made of sodium hydroxide and sodium nitrate, the total alkalinity is 18-35%, the temperature is 90-110 ℃, the polishing time is 2-10 seconds, the workpiece after chemical polishing needs to be cleaned by two flows of clean water, the water quality is kept clean, and the hot water soaking temperature is more than 80 ℃;
s6, press forming: and pressing the metal plate 1 obtained in the step S5 into a shape required by an appliance to obtain a metal pot body with the surface partially coated with the coating.
Claims (10)
1. A method for achieving a localized application of a coating on the surface of a metal cooking appliance, comprising the steps of:
s1, coating the photosensitive resist diluted by alcohol on the surface of the metal plate, drying, exposing and developing to form a preset pattern, baking to harden:
s2, chemical etching is carried out on the surface of the exposed metal plate by spraying etching agent, and a concave-convex pattern is formed on the surface of the metal plate;
s3, spraying a plurality of prepared coatings to the whole surface of the metal plate obtained by the S2 treatment;
s4, sintering and film stripping the metal plate coated with the coating through a plurality of temperature zones as follows: an initial volatilization section T1 for volatilizing the water and volatile substances in the coating; in the second high-temperature sintering section T2, the coating layer is solidified, and the photosensitive adhesive layer is sintered and coked; a three-region crosslinking stabilizing section T3, wherein organic matters in the coating form crosslinking; the four-section low-temperature cooling section T4 is expanded with heat and contracted with cold to peel off the coked photosensitive adhesive layer;
s5, performing chemical polishing on the metal plate obtained in the step S4, and removing yellow marks and/or an oxide layer formed by sintering;
s6, pressing the metal plate material obtained in S5 into a shape required by the cooking utensil to obtain the metal cooking utensil with the surface partially coated with the coating.
2. The method of claim 1, wherein in S1, the dilution volume ratio of alcohol to photosensitive resist is (0.8-1.15): 1, the drying temperature of photosensitive resist is 80-90 ℃, the drying time of photosensitive resist is 15-30 minutes, the exposure time is 60-120 seconds, the developing agent formed by industrial soda solution is used for development, the developing temperature is 30-45 ℃, the baking hardening temperature is 135-180 ℃, and the baking hardening time is 15-25 minutes.
3. The method for realizing the partial coating of paint on the surface of a metal cooking appliance according to claim 1, wherein said S1 is designed to have a predetermined pattern by a negative exposure developing method.
4. The method of claim 1, wherein in the step S4, the initial volatilization section T1 of a zone is 150-300 ℃; the second-zone high-temperature sintering section T2 is 420-480 ℃; the three-region cross-linking stable section T3 is 350-420 ℃; the four-zone low-temperature cooling section T4 is air-cooled to below 60 ℃ at room temperature.
5. The method for realizing the local coating of the surface of the metal cooking utensil as claimed in the claim 1, wherein in the step S3, the plurality of coatings comprise a primer coating and a top coating, the drying temperature of the primer coating is 125-150 ℃, and the top coating is sprayed after the primer coating is dried.
6. The method of claim 5, wherein in the step S4, the initial volatilization section T1 of a zone is 260-270 ℃; the high-temperature sintering section T2 in the second area is 420-435 ℃; the three-region crosslinking stabilizing section T3 is 400-420 ℃; the four-zone low-temperature cooling section T4 is air-cooled to below 60 ℃ at room temperature.
7. The method for locally coating the surface of a metal cooking utensil as claimed in claim 1, wherein the step S2 is performed by chemical etching to a roughness Ra of 0.8-6.3 and an etching depth of 0.8mm or less.
8. The method for realizing local coating of the surface of the metal cooking utensil as claimed in claim 1, wherein in the step S2, the etching agent is ferric trichloride in a mass ratio of 1:10 (0.03-0.08): water: hydrochloric acid, the concentration of the solution is 38-40 DEG Be, the temperature of the solution is 30-45 ℃, and the spraying pressure is 1.2-2.8 kg/cm2。
9. The method for realizing the topical application of paint on the surface of a metal cooking utensil as claimed in claim 1, wherein in the step S5, the chemical polishing solution is a mixed solution of sodium hydroxide and sodium nitrate, the total alkalinity is 18-35%, and the temperature is 90-110 ℃.
10. A metal cooking appliance coated topically with a coating, characterized in that it is prepared according to the method of any one of claims 1 to 9.
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