CN111334834B - Method for making oleophylic non-stick cooking utensils - Google Patents
Method for making oleophylic non-stick cooking utensils Download PDFInfo
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- CN111334834B CN111334834B CN202010166814.8A CN202010166814A CN111334834B CN 111334834 B CN111334834 B CN 111334834B CN 202010166814 A CN202010166814 A CN 202010166814A CN 111334834 B CN111334834 B CN 111334834B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
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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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- 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
- A47J36/027—Cooking- or baking-vessels specially adapted for use in microwave ovens; Accessories therefor
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
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- Inorganic Chemistry (AREA)
- Frying-Pans Or Fryers (AREA)
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Abstract
The invention provides a method for manufacturing an oleophylic non-stick cooker, belonging to the technical field of cookers. It solves the problem that carcinogens harmful to human bodies are generated in the production or use process of the existing non-stick pan. The manufacturing method of the oleophylic non-stick cooker comprises the following steps: a. preparing a cooker: preparing a molded cooker body; b. hard anodizing treatment: carrying out hard anodic oxidation treatment on the surface of the cooker body to form a hard anodic oxide film; c. firing: burning the hard anodic oxide film on the cooker body by adopting flame with the burning temperature of at least over 1200 ℃; d. covering an oil layer: the cooking utensil body is kept in a set high-temperature state, and edible oil is covered on the surface of the hard anodic oxide film subjected to firing treatment; e. and (3) cooling: the cookware body was cooled to room temperature. The manufacturing method of the oleophylic non-stick cooker has the advantage of good safety.
Description
Technical Field
The invention belongs to the technical field of cookers, and relates to a manufacturing method of an oleophylic non-stick cooker, in particular to a manufacturing method of an oleophylic non-stick cooker with a micro-nano structure.
Background
The existing non-stick cookware is often provided with a non-stick coating on the inner surface of the cookware to ensure the non-stick property, and can be divided into two types according to the existence of the organic coating, namely the non-stick cookware with the inner surface provided with a coating represented by Polytetrafluoroethylene (PTFE), and various cookware without the organic coating.
The non-stick pan surface with Polytetrafluoroethylene (PTFE) has a very low surface tension and therefore has excellent non-stick properties. However, the sintering temperature of the non-stick pan in the production process is 400-450 ℃, organic auxiliary agents in the non-stick pan can be converted into Polycyclic Aromatic Hydrocarbons (PAHs) with strong carcinogenicity, most of the Polycyclic Aromatic Hydrocarbons (PAHs) are discharged into the air to become harmful dust particles, and a small amount of the Polycyclic Aromatic Hydrocarbons (PAHs) are mixed in the coating and enter the human body along with food. And the Polytetrafluoroethylene (PTFE) surface layer of the non-stick pan is combined with the metal cooking utensil through the polyamide-imide (PAI) of the bottom layer, and the polyamide-imide (PAI) can decompose Primary Aromatic Amine (PAA) which is a strong carcinogen in a small amount under the condition of high-temperature cooking, so that the potential safety hazard exists.
The surface tension of the cooker which is not an organic coating is usually more than 50dyn/cm, the cooker does not have non-stick property, and the cooker is easy to stick during cooking. Before use, the pan is often opened, namely a carbonization layer is formed on the surface of the iron pan, and the carbonization layer has certain pores, certain lipophilicity on the surface and certain non-stickiness. However, in the step of carbonizing fats and oils, the aliphatic chain of carbohydrates or fats → aromatizing → polycyclication → amorphous carbon, Polycyclic Aromatic Hydrocarbons (PAHs) are generated during the polycyclication, which also poses a threat to human safety.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a method for manufacturing an oleophylic non-stick cooker, and solves the problem of how to avoid carcinogens harmful to human bodies during the production or use of non-stick cookers.
The purpose of the invention can be realized by the following technical scheme:
a method for manufacturing an oleophylic non-stick cooker, which is characterized by comprising the following steps:
a. preparing a cooker: preparing a molded cooker body;
b. hard anodizing treatment: carrying out hard anodic oxidation treatment on the surface of the cooker body to form a hard anodic oxide film;
c. firing: burning the hard anodic oxide film on the cooker body by adopting flame with the burning temperature of at least over 1200 ℃;
d. covering an oil layer: the cooking utensil body is kept in a set high-temperature state, and edible oil is covered on the surface of the hard anodic oxide film subjected to firing treatment;
e. and (3) cooling: the cookware body was cooled to room temperature.
The method for making the oleophylic non-stick cooker can be applied to various shaped cookers, such as a pan, a baking tray and the like. In the manufacturing process, after the cookware body is subjected to hard anodic oxidation treatment, the formed hard anodic oxide film has rich oxide film pores, the diameter of the pores is 10-20 nanometers, and the depth is close to the thickness of the oxide film. However, under normal conditions, the size of the pores of the oxide film is too small, and the viscosity of the edible oil is high, making it difficult to enter the pores of the oxide film. For example, under the condition of 20 ℃, the viscosity of the vegetable oil is 100-200 centipoises, and the viscosity of the water is 1 centipoises, so that the water can more easily enter pores of the oxide film, but the edible oil can not enter the pores. After the hard anodizing treatment, the pores of the hard anodized film tend to self-close until they gradually disappear.
The manufacturing method of the oleophylic non-stick cooker adopts flame with the temperature of more than 1200 ℃ to burn the hard anodic oxide film, so that the oxide film is dehydrated, the hardness of the oxide film is improved, and the porous layer of the oxide film stably exists and cannot disappear, thereby facilitating the stability and effectiveness of subsequent oil coating.
Thereafter, the cooker body is maintained in a set high temperature state, and air and moisture in the pores of the oxide film are discharged due to the high temperature. According to the temperature-volume law of the gas, about half of the air is discharged from the pores of the oxide film, so that the pores are left with space for the edible oil to enter. Meanwhile, the edible oil has low viscosity even lower than 1 centipoise at high temperature, is very suitable for flowing and can cover the whole surface of the oxide film. And e, along with the cooling process of the step e, the temperature of the cooker body slowly decreases, the surface of the oxidation film is covered with a layer of edible oil, so that outside air is prevented from entering, and the vacuum negative pressure formed in the pores of the oxidation film guides the edible oil to enter the pores of the oxidation film to form an oil storage layer. After the oil storage layer is formed, when cooking, the oil storage layer is compatible with edible oil additionally added into the cooker body through Van der Waals force, and an oil film serving as an oleophilic layer is formed on the surface of the cooker, so that lipophilicity is improved, and the non-sticky effect of the oil storage layer is ensured. In addition, when the cooker with the oil storage layer is used for frying and cooking, because the edible oil in the oil storage layer is compatible with the edible oil which is additionally added into the cooker and forms the oleophilic layer, in the cooking process, the edible oil in the oil storage layer can exchange oil with the oleophilic layer formed on the surface of the cooker, because the edible oil and the oleophilic layer are edible oil, after the exchange, the food cooked cannot be influenced, the situation that the edible oil in the oil storage layer is stored for a long time and goes bad can be avoided, the oil amount in the oil storage layer can be ensured, and the non-adhesiveness of the cooker body is ensured. Therefore, the oil in the oil storage layer in the cooker body can be exchanged with a small amount of liquid added into the cooker during cooking in the actual cooking process, and the manufacturing method mainly aims at manufacturing cookers with large oil consumption and small water consumption, such as a frying pan, a baking tray and the like, and is not suitable for a boiling pan, a stew pan and the like. After frying, even if a small amount of water in the food material is exchanged with oil in the oil storage layer, the cooking utensil is firstly heated because the user uses the cooking utensil again, the water in the oil storage layer is evaporated in the process of heating the cooking utensil, and then the edible oil is added into the cooking utensil, so that the oil in the oil storage layer can be supplemented by the edible oil, and the problem that the non-adhesiveness of the cooking utensil is influenced because the oil in the oil storage layer is completely leaked is avoided.
In the production and use process, the preparation method only involves hard anodic oxidation treatment, high-temperature firing and edible oil covering, cancerogen is not generated in the production process, and in the use process, the edible oil in the oil storage layer is in the same state as the edible oil added in the cooking process of daily frying and the like, cancerogen is not generated additionally, so that the preparation method is environment-friendly, can effectively avoid the harm to the human body, and improves the use safety.
In the above method, the hard anodic oxide film is burned by using a flame bundle in step c. The condition that pores disappear due to the combination of intermolecular water in the hard anodic oxide film on the surface of the cooker body and water in the air can be avoided by adopting the clustered flame for burning, so that edible oil enters the pores of the hard anodic oxide film at each position on the cooker, and the non-adhesiveness is ensured. Even if the clogging phenomenon has occurred, the oxide film pores can be recovered by burning.
And (3) blocking reaction: al (Al)2O3·H2O+2H2O→2Al(OH)3
And (3) recovery reaction: 2Al (OH)3→Al2O3+3H2O
In the above method for manufacturing the oleophylic non-stick cooker, in the step c, the burning time is 4-9 seconds per square decimeter of surface burned by flame. The method comprises the steps of quickly burning the hard anodic oxide film in a short time, ensuring that the hard anodic oxide film is dehydrated in the burning treatment process to enable the porous layer to exist stably, and avoiding burning and melting to damage a cooker body due to high temperature, wherein in the specific burning process, the time required by the whole cooker body to be burned is obtained by multiplying the surface area value required by the cooker body to be burned by unit burning time, for example, the burning time in unit time is 4 seconds, the surface area value is 10 square decimeters, and the total burning time of the cooker body is 40 seconds.
In the above method for making an oleophylic non-stick cooker, the surface of the cooker body is mechanically treated between step a and step b to make the surface roughness of the cooker body less than 2 microns. The roughness formed after mechanical treatment can ensure the thickness of an oleophilic layer formed on the surface of a final finished product, so as to ensure the non-adhesiveness of the cooker, and the excessive roughness can cause that the cooker is easy to remain dirt and is not easy to clean after use.
In the above method for manufacturing the oleophylic non-stick cooker, the surface of the cooker body is corroded by chemical corrosion between the steps a and b. The formation of submicron roughness by chemical etching can be promoted by increasing the specific surface area during cooking.
In the above method for manufacturing the oleophylic non-stick cooker, in the step d, the temperature of the set high temperature state is 250 to 500 ℃. The temperature of 250-500 ℃ is suitable, too low temperature causes the air discharged from the pores of the hard anodic oxide film to be limited, the viscosity of the edible oil is higher, less oil enters the pores of the oxide film, the lipophilicity of the surface of the cooker is small, the non-stickiness of the cooker is affected, and if too high temperature is adopted, the evaporation capacity of the edible oil is too large, the possibility of carbonization exists, and potential safety hazards exist.
Compared with the prior art, the manufacturing method of the oleophylic non-stick cooker has the following advantages:
1. the manufacturing method only comprises the steps of hard anodic oxidation treatment, short-time rapid high-temperature burning and edible oil covering in the process of manufacturing the non-stick cooker, does not generate and discharge carcinogens in the production process, is environment-friendly, and can ensure the use safety.
2. After the hard anodic oxide film is burnt at high temperature, the hardness of the hard anodic oxide film can be improved, and the service life of the cooker is further prolonged.
3. After the edible oil is stored in the pores of the hard anodic oxide film, the original water molecules which are easy to enter are difficult to enter the pores of the oxide film, and the sauce dissolved in the water can not stain the oxide film, so that the cooker body can not be dyed.
Drawings
Fig. 1 is a flow chart of the making method of the oleophilic non-stick cooker.
Fig. 2 is a sectional structural view of the cooker body.
FIG. 3 is a schematic view of the structure of air venting in the pores of the hard anodized film.
FIG. 4 is a partially enlarged view of the oil layer covering the surface of the hard anodic oxide film in a high temperature state.
Fig. 5 is a partially enlarged view of oil entering pores of the hard anodized film.
Fig. 6 is a partially enlarged view after cleaning the residual oil.
In the figure, 1, a cooker body; 2. a hard anodic oxide film; 3. a pore; 4. and (3) edible oil.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
As shown in fig. 1 and fig. 2, the manufacturing method of the oleophylic non-stick cooker is used for processing an aluminum alloy cooker to form a cooker with good oleophylic property and non-stick property, and specifically comprises the following steps:
a. preparing a cooker: preparing a molded cooker body 1;
the formed aluminum alloy cooker body 1 can be processed by the processes of drawing, spinning, casting and the like, wherein the aluminum alloy selected by the processing modes of drawing, spinning and the like is 3XXX series aluminum-manganese alloy, such as 3003, 3103A, 3004 and the like. Casting aluminum alloy with silicon element content (Si) less than 8% is selected for casting and the like, and the inner surface of the cast cooker is subjected to turning treatment to remove scale formed in the casting process. Further, they may be purchased in the market without being manufactured by themselves.
a1, mechanically processing the surface of the cooker body 1 to make the surface roughness of the cooker body 1 less than 2 microns.
The mechanical treatment can be specifically fine sanding of the inner surface of the cooker body 1 by gauze or scouring pad, or fine sand surface is formed in a sand blasting mode, and the roughness formed after the mechanical treatment can ensure the thickness of an oleophilic layer formed on the surface of a final finished product, so that the non-adhesiveness of the cooker is ensured.
The thickness of the oil film can be controlled by the surface roughness, preferably 0.3-2.0 μm. The cooker with roughness higher than 2.0 microns is difficult to clean, and the cooker with roughness lower than 0.3 microns has small oil film thickness formed by oleophilic layers and poor non-adhesiveness.
a2, corroding the surface of the cooker body 1 by adopting a chemical corrosion mode.
The following description will be given by way of example, but in no way limits:
the surface of the cooker body 1 can form submicron roughness by means of chemical corrosion, the specific surface area is increased, and the formation of oleophilic layer can be further promoted during cooking.
b. Hard anodizing treatment: carrying out hard anodic oxidation treatment on the surface of the cooker body 1 to form a hard anodic oxide film 2;
the hard anodizing treatment is a mature treatment process, and in this embodiment, the hard anodizing treatment of a sulfuric acid system is selected, so that the thickness of the oxide film is more than 25 micrometers. The hard anodizing process comprises the following steps:
in general, the hard anodic oxide film 2 of the sulfuric acid system is formed of γ -Al2O3，Al2O3·H2O，Al2(SO4)3·xH2O, high hardness and high antiwear performance. The hard anodic oxide film 2 is provided with rich oxide film pores 3, the diameter of the pores 3 is 10-20 nanometers, and the depth is close to the thickness of the oxide film. However, under normal conditions, the size of the oxide film pores 3 is too small, and the viscosity of the edible oil 4 is high, making it difficult to enter the oxide film pores 3. For example, at 20 ℃, the viscosity of the vegetable oil is 100 to 200 centipoise, and the viscosity of the water is 1 centipoise, so that the water can enter the pores 3 of the oxide film more easily, and the edible oil 4 can not enter the pores. After the hard anodizing treatment, the pores 3 of the hard anodized film 2 tend to be self-closed until they disappear gradually.
c. Firing: burning the hard anodic oxide film 2 on the cooker body 1 by adopting flame with the burning temperature of at least 1200 ℃;
the hard anodic oxide film 2 is burned by adopting flame at the temperature of more than 1200 ℃, so that the oxide film is dehydrated, the hardness of the oxide film is improved, and a porous layer of the oxide film stably exists and does not disappear, thereby facilitating the stability and effectiveness of subsequent oil coating.
In this embodiment, the temperature of the flame may be specifically 2000 ℃, 3000 ℃, etc., in the process, a high-energy-density cluster flame is used to rapidly burn the hard anodic oxide film 2, the flame is repeatedly moved in the burning process, the burning time is 4 to 9 seconds per square decimeter of the surface burned by the flame, and 5 seconds, 7 seconds, etc. may be selected according to different factors such as the thickness of the material.
Has been burnt inIn the process, hydrated alumina (Al) in the hard anodic oxide film 2 of the inner surface of the cooker body 12O3·H2O), hydrated aluminum sulfate [ Al ]2(SO4)3·xH2O]Decomposition into gamma-Al2O3The reaction equation is as follows:
Al2O3·H2O→Al2O3+H2O
Al2(SO4)3·xH2O→Al2O3+xH2O+3SO3
Al2O3·H2O，Al2(SO4)3·xH2conversion of O to more dense gamma-Al2O3The rear hardness becomes high. Along with the burning, the surface temperature of the oxide film is continuously increased, and the gamma-Al2O3It becomes denser and the oxide film becomes harder. Through experiments, the hardness of the hard anodic oxide film 2 of the 3003 aluminum alloy can be improved to 800-1200 HV from 400-500 HV, and the hardness of the hard anodic oxide film 2 of the cast aluminum alloy can be improved to 500-800 HV from 250-400 HV.
In this embodiment, the combustion improver of the flame is oxygen, the fuel gas may be acetylene, propane, liquefied petroleum gas, natural gas, or other combustible gas, and the combustion device must be capable of burning the gas in a cluster, such as a flame cutting torch, a flame cutting machine, or the like.
d. Covering an oil layer: keeping the cooker body 1 in a set high-temperature state, and covering edible oil 4 on the surface of the burned hard anodic oxide film 2;
as shown in fig. 2, air and moisture in the pores 3 of the oxide film are discharged due to the high temperature. According to the temperature-volume law of the gas, about half of the air is discharged from the pores 3 of the oxide film, leaving a space in the pores 3 for the edible oil 4 to enter. Meanwhile, as shown in fig. 3, the edible oil 4 has a very low viscosity even lower than 1 centipoise at high temperature, and is very suitable for flowing and can cover the whole surface of the oxide film.
In the embodiment, the set high temperature state is to keep the whole cooker body 1 at 250-500 ℃, the temperature is suitable, too low temperature causes limited air exhausted from the pores 3 of the hard anodic oxide film 2, the viscosity of the edible oil 4 is also higher, less oil enters the pores 3 of the oxide film, the lipophilicity of the surface of the cooker is caused to be small, the non-adhesiveness of the cooker is influenced, and if too high temperature is adopted, the evaporation capacity of the edible oil 4 is too large, the possibility of carbonization exists, and potential safety hazards exist. The high temperature state can be directly obtained by gradually cooling the burned cooker cup body, and can also be obtained by heating the cooker cup body again by using a drying tunnel or an oven after the cooker cup body is cooled. And then, covering the surface of the hard anodic oxide film 2 with edible oil 4, wherein the covering mode can be spraying, brushing or soaking, and the temperature selection of the high-temperature state is different according to the difference of the covering mode, for example, the brushing or spraying mode is adopted, the oil covering quantity is small, the highest temperature is not more than 400 ℃, while the soaking mode is adopted, the oil covering quantity is large, the temperature of the cooker is reduced more quickly, and the temperature upper limit can be increased to 500 ℃. The edible oil 4 can be soybean oil, palm oil, oleum Rapae, adeps Sus Domestica or various blend oils.
e. And (3) cooling: the cooker body 1 is cooled to room temperature.
As shown in FIG. 4, the temperature of the cooker body 1 is slowly decreased, the outside air is prevented from entering because the surface of the oxidation film is covered with a layer of edible oil 4, and the vacuum negative pressure formed in the pores 3 leads the edible oil 4 to enter the pores 3 of the oxidation film to form an oil reservoir. After the oil storage layer is formed, when cooking, the van der Waals force is used for being compatible with the edible oil 4 additionally added into the cooker body 1, an oil film serving as an oleophilic layer is formed on the surface of the cooker, lipophilicity is improved, and the non-sticky effect of the oleophilic layer is ensured.
f. As shown in fig. 5, the residual edible oil 4 is removed to obtain the non-stick cookware finished product.
In this embodiment, a 30cm × 40cm square baking tray is used as the specific cooker body 1, ZL101 (silicon content is 7%) is used as the material, the molding method is die casting, fine sand blasting is performed after turning the inner surface, hard anodizing treatment is performed by using sulfuric acid, the flame temperature is 3000 ℃, the burning time is 4 seconds per square decimeter of surface burning by using flame, the flame is repeatedly moved for burning for about 50 seconds, here, the whole burning time of the cooker body 1 is obtained by multiplying the surface area value of the cooker body 1 to be burned by the unit burning time, of course, small-amplitude fluctuation can be performed in the whole burning time according to the manufacturing process of the cooker body 1 during actual burning and the stability of the flame burning temperature, and soybean oil is covered when the cooker body 1 is kept at 250 ℃.
In the production and use process, only mechanical treatment, chemical corrosion, hard anodic oxidation treatment, high-temperature burning and covering of the edible oil 4 are involved, cancerogen cannot be generated in the production process, and in the use process, the edible oil 4 in the oil storage layer is in the same state as the edible oil 4 added in the cooking process of daily frying and the like, cancerogen cannot be generated additionally, so that the production and use process is environment-friendly, the harm to a human body can be effectively avoided, and the use safety is improved.
Example two
The scheme of this embodiment is substantially the same as that of the first embodiment, except that: a frying pan with the diameter of 26cm is adopted for the cooker body 1, 3103A aluminum alloy is selected as a material, the forming mode is deep drawing, the inner surface is finely sanded, sulfuric acid hard anodizing treatment is adopted, the flame temperature is 1800 ℃, propane-pure oxygen is adopted as a fuel, the burning time is 6 seconds per square decimeter of surface burning by flame, the flame is repeatedly moved for about 30 seconds, and soybean oil is covered when the cooker body 1 is kept at 500 ℃.
EXAMPLE III
The scheme of this embodiment is substantially the same as that of the first embodiment, except that: a frying pan with the diameter of 32cm is adopted as the cooker body 1, 3103A aluminum alloy is selected as a material, the forming mode is spinning, the inner surface is finely sanded, sulfuric acid hard anode oxidation treatment is adopted, the flame temperature is 1200 ℃, liquefied gas-pure oxygen is adopted as a fuel, the burning time is that flame is used for burning the surface of each square decimeter for 9 seconds, the flame is repeatedly moved for burning for about 75 seconds, and soybean oil is covered when the cooker body 1 is kept at 400 ℃.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. A method for manufacturing an oleophylic non-stick cooker, which is characterized by comprising the following steps:
a. preparing a cooker: preparing a formed cooker body (1);
b. hard anodizing treatment: carrying out hard anodic oxidation treatment on the surface of the cooker body (1) to form a hard anodic oxidation film (2);
c. firing: burning the hard anodic oxide film (2) on the cooker body (1) by adopting flame with the burning temperature of at least over 1200 ℃;
d. covering an oil layer: keeping the cooker body (1) in a set high-temperature state at the temperature of 250-500 ℃, and covering edible oil (4) on the surface of the burned hard anodic oxide film (2);
e. and (3) cooling: the cooker body (1) is cooled to room temperature.
2. A method for making an oleophilic non-stick cooking utensil as claimed in claim 1, wherein in step c, the hard anodized film (2) is burned with a flame bundle.
3. A method for making an oleophylic non-stick cooking utensil as claimed in claim 2, wherein in step c, the burning time is 4-9 seconds per square decimeter surface burned by flame.
4. A method for making an oleophilic non-stick cookware according to claim 1 or 2 or 3, characterized in that between step a and step b the surface of the cookware body (1) is mechanically treated to make the surface roughness of the cookware body (1) less than 2 μm.
5. A method for making an oleophilic non-stick cooking utensil as claimed in claim 1 or 2 or 3, wherein between steps a and b the surface of the cooking utensil body (1) is chemically etched.
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