CN111227654A - Graphene inner container, preparation method of graphene inner container and electromagnetic cooker - Google Patents
Graphene inner container, preparation method of graphene inner container and electromagnetic cooker Download PDFInfo
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- CN111227654A CN111227654A CN202010066316.6A CN202010066316A CN111227654A CN 111227654 A CN111227654 A CN 111227654A CN 202010066316 A CN202010066316 A CN 202010066316A CN 111227654 A CN111227654 A CN 111227654A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 146
- 238000002360 preparation method Methods 0.000 title abstract description 8
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- 238000000034 method Methods 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 25
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- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims description 39
- 238000005488 sandblasting Methods 0.000 claims description 19
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- 230000003647 oxidation Effects 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
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- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 claims description 6
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
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- 238000010438 heat treatment Methods 0.000 abstract description 60
- 235000013305 food Nutrition 0.000 abstract description 9
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- 235000007164 Oryza sativa Nutrition 0.000 abstract description 4
- 235000009566 rice Nutrition 0.000 abstract description 4
- 238000013021 overheating Methods 0.000 abstract description 3
- 240000007594 Oryza sativa Species 0.000 abstract 1
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- 229910002804 graphite Inorganic materials 0.000 description 10
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- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
-
- 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
- A47J36/04—Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay the materials being non-metallic
-
- 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
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
-
- 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
- B05D7/22—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 internal surfaces, e.g. of tubes
- B05D7/227—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 internal surfaces, e.g. of tubes of containers, cans or the like
-
- 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
- B05D7/24—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 for applying particular liquids or other fluent materials
-
- 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
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
-
- 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
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Food Science & Technology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of electromagnetic cookers, and discloses a graphene inner container, a preparation method of the graphene inner container and an electromagnetic cooker, wherein the graphene inner container comprises an inner container body and a graphene coating arranged on the inner wall and/or the outer wall of the inner container body; the graphene coating comprises the following components in percentage by mass: 3% -10% of graphene powder and 50% -65% of polytetrafluoroethylene; according to the invention, the graphene coating is arranged on the inner wall and/or the outer wall of the inner container body, so that the heating efficiency and the heating temperature uniformity of the graphene inner container are greatly improved, a better energy-saving effect is achieved, the problems of limited thermal conductivity, low heating speed and uneven heating in the use process of the inner container of the conventional IH electric rice cooker are effectively solved, the pan burnt caused by local overheating of the bottom of the pan is avoided, the taste of food is greatly improved, and good use experience is brought to users.
Description
Technical Field
The invention relates to the technical field of electromagnetic cookers, in particular to a graphene inner container, a preparation method of the graphene inner container and an electromagnetic cooker.
Background
Nowadays, the electric rice cooker has become one of the essential electric appliances for the life of residents, and has very high use frequency in daily life. The heating modes of the electric cooker mainly comprise two types: heating disks are electrically heated and IH (electromagnetic) heated. The heating plate is electrically heated by the heating plate which is electrified and heated at the bottom of the electric cooker, and the alloy inner container is heated by the IH heating mode through an electromagnetic induction coil at the bottom of the electric cooker by utilizing the principle of electromagnetic induction. The IH heating electric cooker is gradually the mainstream of the market because the power and the heating efficiency of the IH heating electric cooker are stronger than those of the heating type electric cooker with the heating plate.
The inner container of the existing electric cooker mainly comprises: an aluminum alloy inner container, a stainless steel inner container, an iron inner container, a ceramic inner container and the like. Because the IH heating mode utilizes the electromagnetic induction principle, the inner container of the IH heating electric cooker usually adopts a metal inner container and an alloy inner container with magnetic conductivity. The IH heating electric cooker adopts a heating mode that the inner container of the electric cooker is heated only by the magnetic induction coil at the bottom of the inner container, so that the heating efficiency has certain limitation; meanwhile, the alloy inner container of the IH electric cooker has limited thermal conductivity, and the problems of low heating speed, uneven heating and the like can occur in the using process. These problems lead to local over-high temperature at the bottom of the pan to cause pan pasting, which can affect cooking efficiency and greatly reduce the taste of food.
At present, in one of the improvement schemes, the contact area between the heating disc or the magnetic induction coil and the inner container is increased by changing the shape of the heating disc or the magnetic induction coil or the inner container, so as to improve the heating efficiency of the inner container; in another improvement scheme, an aluminum layer for heat equalization is laid on the outer surface of the inner container of the electric cooker, so that the heat conduction performance of the inner container is improved, and the heating temperature equalization performance of the inner container is improved.
The two improved schemes improve the heating efficiency and the heating temperature uniformity of the inner container to a certain extent. However, due to the influence of the inherent heating mode and the inner container structure of the electric cooker, although the shape of the heating disc or the magnetic induction coil is changed, the inner container cannot be heated by self heat preservation, and larger heat loss exists in the using process, so that the heating efficiency is improved limitedly; even if the surface of the inner container is added with the heat transfer layer, the heat conductivity coefficient of the heat transfer layer is not high, the heat conduction efficiency is not high, and the improvement degree of the heating uniformity has limitation. Therefore, the electric cooker may cause the problems of pan pasting, low heating efficiency and the like due to overhigh local temperature of the bottom of the pan in the working process, thereby reducing the cooking efficiency and greatly influencing the taste of food.
Disclosure of Invention
The embodiment of the invention aims to provide a graphene inner container and a preparation method thereof, which are used for solving the problems of low heating efficiency and poor heating temperature uniformity effect of the existing electric cooker inner container in use.
The embodiment of the invention also aims to provide the electromagnetic cooker based on the graphene inner container, which is used for solving the problems of low cooking efficiency and poor taste of cooked food of the existing electric cooker.
In order to solve the above technical problem, an embodiment of the present invention provides a graphene liner, including a liner body, and further including a graphene coating disposed on an inner wall and/or an outer wall of the liner body; the graphene coating comprises the following components in percentage by mass: 3-10% of graphene powder and 50-65% of polytetrafluoroethylene.
The graphene coating further comprises the following components in percentage by mass: 3% -5% of heat-conducting powder and 2% -5% of vinyl fluoride resin, wherein the heat-conducting powder contains any one of aluminum oxide, magnesium oxide and zinc oxide.
The particle size of the graphene powder is 10-30 nm; and/or the graphene powder is physically-processed graphene powder, and the physically-processed graphene powder comprises graphene oxide powder.
The thickness of the graphene coating on the inner wall of the inner container body is 10-30 microns; and/or the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall of the inner container body is smaller than that of the graphene coating on the outer wall corresponding to the bottom and the side wall combination part, the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall is 10-30 μm, and the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall combination part is 25-35 μm.
The embodiment of the invention also provides a preparation method based on the graphene liner, which comprises the following steps: s1, preparing a uniformly mixed coating, wherein the coating is prepared from the following components in percentage by mass: 3-10% of graphene powder, 50-65% of polytetrafluoroethylene, 3-5% of heat-conducting powder and 2-5% of fluorinated ethylene resin; s2, coating the paint on the inner wall and/or the outer wall of the inner container body; and S3, drying and curing the mixture, and finishing the process.
And in S1, treating the coating by adopting an ultrasonic uniform method, wherein the treatment time of the ultrasonic uniform method is 30-40 min, and the ultrasonic frequency is 20-80 KHz.
Wherein the step of coating the coating material on the inner wall of the inner container body in S2 includes: carrying out sand blasting treatment on the inner wall surface of the cleaned and dried inner container body to enable the surface roughness of the inner wall surface to reach Ry 50-120 mu m; sequentially carrying out oxidation treatment and bottom oil spraying treatment on the inner wall surface of the inner container body, baking for 2-8 min at the temperature of 150-220 ℃ after the bottom oil spraying is finished, and drying the bottom oil; and spraying the coating on the inner wall surface of the inner container body.
Wherein the step of coating the paint on the outer wall of the inner container body in S2 includes: carrying out sand blasting treatment on the outer wall surface of the cleaned and dried inner container body to enable the surface roughness of the outer wall surface to reach Ry 50-120 mu m; and spraying the coating on the surface of the outer wall of the inner container body.
Wherein, the step of performing drying and curing treatment in S3 comprises: and curing the inner container body coated with the coating for 25-50min at the temperature of 180-250 ℃.
Embodiments of the present invention further provide an electromagnetic cooker, which includes the graphene inner container as described above.
According to the graphene inner container and the preparation method thereof provided by the embodiment of the invention, the graphene coating is arranged on the inner wall and/or the outer wall of the inner container body, and the graphene coating can resist high temperature of 500 ℃ and has the characteristic of water washing resistance. Furthermore, the graphene can generate heat under the action of an electromagnetic field, so that the heating efficiency of the graphene liner can be greatly improved; the heating temperature uniformity of the graphene liner can be further enhanced by utilizing the characteristic of high thermal conductivity of graphene; meanwhile, the graphene coating can emit infrared rays after being heated, so that heat preservation around the graphene liner can be realized to form a warm cavity, thereby reducing heat loss to the outside, saving energy and correspondingly reducing energy consumption. Therefore, the problems of limited thermal conductivity, low heating speed and uneven heating in the using process of the inner container of the conventional IH electric cooker are effectively solved.
According to the electromagnetic cooker provided by the embodiment of the invention, due to the adoption of the graphene inner container, the energy consumption is low and the cooking efficiency can be greatly improved in the using process. When the electromagnetic cooker is used for an electric cooker and cooks rice, the heating speed is increased and the heating is more uniform, the heat conductivity coefficient of the inner container of the existing electric cooker is improved, the problem that the cooker is burnt due to local overheating of the cooker bottom is solved, the taste of food is greatly improved, and good use experience is brought to a user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a graphene inner container according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for preparing a graphene liner according to an embodiment of the present invention.
Description of reference numerals: 1. an inner container body; 2. and (4) coating graphene.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present embodiment provides a graphene liner, including a liner body 1, and further including a graphene coating 2 disposed on an inner wall and/or an outer wall of the liner body 1; the graphene coating 2 comprises the following components in percentage by mass: 3-10% of graphene powder and 50-65% of polytetrafluoroethylene.
Specifically, in the structure shown in fig. 1, a graphene coating layer 2 is provided on the outer wall surface of the inner container 1. Certainly, the graphene coating can also be arranged on the surface of the inner wall of the inner container body, and in order to further enhance the heating efficiency and the heating temperature uniformity of the graphene inner container, a layer of graphene coating can be correspondingly arranged on the surfaces of the inner wall and the outer wall of the inner container body. Meanwhile, the material of the inner container body may be a high temperature resistant ceramic material known in the art, or a high temperature resistant magnetic conductive metal material known in the art, such as: iron, ferroalloy, etc. to further promote the heating efficiency and the heating temperature uniformity of graphite alkene inner bag.
In the graphene liner shown in the embodiment, the graphene coating is arranged on the inner wall and/or the outer wall of the liner body, and the graphene coating can resist high temperature of 500 ℃ and has the characteristic of water washing resistance. Furthermore, the graphene can generate heat under the action of an electromagnetic field, so that the heating efficiency of the graphene liner can be greatly improved; the heating temperature uniformity of the graphene liner can be further enhanced by utilizing the characteristic of high thermal conductivity of graphene; meanwhile, the graphene coating can emit infrared rays after being heated, so that heat preservation around the graphene liner can be realized to form a warm cavity, thereby reducing heat loss to the outside, saving energy and correspondingly reducing energy consumption. Therefore, the problems of limited thermal conductivity, low heating speed and uneven heating in the using process of the inner container of the conventional IH electric cooker are effectively solved.
Meanwhile, it should be noted that the graphene coating is arranged on the surface of the outer wall of the graphene liner, and the graphene coating has the main function of enhancing the heating efficiency and the heating temperature uniformity of the graphene liner by utilizing the characteristic of high thermal conductivity of graphene; set up the graphite alkene coating on the surface of graphite alkene inner bag inner wall, except further increasing the heating efficiency of graphite alkene inner bag, another main function is the heat preservation effect that increases graphite alkene inner bag. Through the graphene coating characteristic of combining the inner wall and the outer wall surface of the graphene inner container, the graphene inner container can improve the heating efficiency and has a good heat preservation effect.
In addition, it should be pointed out here that, because the specific surface area of graphene is relatively large, the corresponding thixotropy is also relatively strong, the viscosity of the corresponding coating of the graphene coating can be improved by adding a trace amount of graphene powder, and the viscosity of the coating directly influences the subsequent storage and spraying processes, through a series of experiments, the content of the graphene powder is determined to be 3% -10%, the content of the graphene powder is further determined to be 5% preferably, the particle size of the graphene powder is 10-30 nm, the graphene powder is a physical method graphene powder, and the physical method graphene powder is further selected to be an oxidized graphene powder.
Meanwhile, as the polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation property and good ageing resistance, the polytetrafluoroethylene with the mass percent of 50-65% is selected as the adhesive in the graphene coating. Further, in order to ensure the dispersion uniformity of each component in the corresponding coating of the graphene coating, a dispersant with a mass percentage of 5% -10% can be selected, such as: acetone is used as a dispersant.
Therefore, after the graphene powder and the polytetrafluoroethylene with corresponding mass percentages are uniformly mixed, the prepared graphene coating not only is beneficial to enhancing the heating efficiency and the heating temperature uniformity of the graphene liner, but also has stable chemical property, and has the characteristics of high temperature resistance, corrosion resistance, environmental friendliness and no harm to human bodies.
Preferably, the graphene coating in this embodiment further includes the following components in percentage by mass: 3% -5% of heat-conducting powder and 2% -5% of vinyl fluoride resin, wherein the heat-conducting powder contains any one of alumina, magnesia and zinc oxide.
Specifically, the heat conducting powder with the mass percent of 3% -5% is added, so that the heat conductivity of the graphene coating is further enhanced on the basis of not influencing the corresponding heating effect of the graphene coating under the action of an electromagnetic field, and the better heating temperature uniformity of the graphene inner container is ensured. Meanwhile, the fluorinated ethylene resin with the mass percentage of 2-5% is added to further enhance the adhesion compactness among all components in the graphene coating, so that the graphene coating is ensured to have strong wear resistance.
Preferably, the thickness of the graphene coating on the inner wall of the inner container body in the embodiment is 10-30 μm; and/or the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall of the inner container body is smaller than the thickness of the graphene coating on the corresponding outer wall at the joint of the bottom and the side wall, the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall is 10-30 mu m, and the thickness of the graphene coating on the outer wall corresponding to the joint of the bottom and the side wall is 25-35 mu m.
Specifically, the magnetic induction coil in the electromagnetic cooker is arranged at the bottom of the inner side of the shell of the electromagnetic cooker and corresponds to the bottom of the graphene inner container, so that when the electromagnetic cooker works, a magnetic field close to the bottom of the graphene inner container is strong, and a magnetic field close to the side wall of the graphene inner container is relatively weak, so that the heating temperature of the graphene coating corresponding to the bottom of the graphene inner container is higher than that of the graphene coating corresponding to the side wall of the graphene inner container. From this, through the thickness with the graphite alkene coating that graphite alkene inner bag bottom and lateral wall joint part correspond so design, help the heat to conduct its lateral wall from the bottom of graphite alkene inner bag, so can further strengthen the heat conductivility of graphite alkene inner bag, ensure the temperature uniformity nature of graphite alkene inner bag heating.
Preferably, referring to fig. 2, the present embodiment further provides a preparation method based on the graphene liner, including: s1, preparing a uniformly mixed coating, wherein the coating is prepared from the following components in percentage by mass: 3% -10% of graphene powder, 50% -65% of polytetrafluoroethylene, 3% -5% of heat-conducting powder and 2% -5% of vinyl fluoride resin, wherein the heat-conducting powder contains any one of aluminum oxide, magnesium oxide and zinc oxide; s2, coating the coating on the inner wall and/or the outer wall of the inner container body; and S3, drying and curing the mixture, and finishing the process.
Specifically, in one specific embodiment, firstly, the coating is configured according to the following components by mass percent: 3% of graphene powder, 50% of polytetrafluoroethylene, 3% of aluminum oxide and 2% of vinyl fluoride resin, and treating the coating by an ultrasonic homogenization method, wherein the treatment time of the ultrasonic homogenization method is 30min, and the ultrasonic frequency is 20 KHz.
Then, the evenly mixed coating is coated on the inner wall of the inner container body, and the method comprises the following specific steps: the surface of the inner wall of the inner container body is cleaned and dried fully, and the impurities, floating dust and the like on the inner surface of the inner container body are mainly removed so as to avoid influencing the subsequent spraying treatment; secondly, carrying out internal sand blasting process treatment on the cleaned and dried inner container body by adopting carborundum (corundum) with the grain size of 70-80 meshes, wherein the treatment thickness is 8 microns, and after sand blasting treatment, the surface roughness of the inner wall surface of the inner container body reaches Ry 50-120 microns, so that a rough surface is formed to enhance the adhesive force between the inner wall surface of the inner container body and the graphene coating; after the internal sand blasting treatment, the surface of the inner wall of the liner body is subjected to oxidation treatment by an anodic oxidation method, and the oxidation treatment can improve the corrosion resistance, the wear resistance and the hardness of the liner body; then, performing bottom oil spraying treatment on the inner container body, wherein the type of the bottom oil is KF-8622-5000B, and the thickness is more than 12 mu m; and after the base oil is sprayed, baking for 2min at the temperature of 150 ℃, and drying the base oil. Spraying the uniformly mixed coating on the inner wall surface of the liner body by using a spray gun communicated with an air compressor under the normal temperature condition, wherein a 71# spray gun (the caliber of a nozzle is 1.5mm) is used; and finally, placing the sprayed liner body in an environment of 180 ℃ for curing for 25min, and finishing spraying. By spraying the coating on the inner wall of the inner container body through the process, the formed graphene coating can be tightly attached to the inner wall of the inner container body into a whole, and a falling-off field can not occur, so that the food safety of household personnel is ensured.
Then, coating the uniformly mixed coating on the outer wall of the inner container body, and the method comprises the following specific steps: the surface of the outer wall of the inner container body is cleaned and dried fully, and the impurities, floating dust and the like on the outer surface of the inner container body are mainly removed so as to avoid influencing the subsequent spraying treatment; secondly, carrying out external sand blasting process treatment on the cleaned and dried inner container body by adopting carborundum (corundum) with the grain size of 70-80 meshes, wherein after the sand blasting treatment, the surface roughness of the outer wall surface of the inner container body reaches Ry 50-120 mu m, and the aim of forming a rough surface is to enhance the adhesive force between the outer wall surface of the inner container body and the graphene coating; spraying the uniformly mixed coating on the surface of the outer wall of the inner container body by using a spray gun communicated with an air compressor under the condition of normal temperature, wherein a 71# spray gun (the caliber of the spray nozzle is 1.5mm) is used, the spraying thicknesses of different positions of the outer wall of the inner container body are different in the spraying process, the thickness range of the sprayed graphene coating is 10-30 mu m on the bottom and the side surface of the inner container body, but the thickness of the sprayed graphene coating at the radian junction of the bottom and the side surface is thicker than the corresponding positions of the bottom and the side surface and ranges from 25-35 mu m; and finally, placing the sprayed liner body in an environment of 180 ℃ for curing for 25min, and finishing spraying.
Meanwhile, in a second specific embodiment, first, the coating is prepared according to the following components by mass percent: 5% of graphene powder, 60% of polytetrafluoroethylene, 4% of magnesium oxide and 3% of fluorinated ethylene resin, and treating the coating by an ultrasonic homogenization method, wherein the treatment time of the ultrasonic homogenization method is 40min, and the ultrasonic frequency is 50 KHz.
Then, the evenly mixed coating is coated on the inner wall of the inner container body, and the method comprises the following specific steps: the surface of the inner wall of the inner container body is cleaned and dried fully, and the impurities, floating dust and the like on the inner surface of the inner container body are mainly removed so as to avoid influencing the subsequent spraying treatment; secondly, carrying out internal sand blasting process treatment on the cleaned and dried inner container body by adopting carborundum (corundum) with the grain size of 70-80 meshes, wherein the treatment thickness is 8 microns, and after sand blasting treatment, the surface roughness of the inner wall surface of the inner container body reaches Ry 50-120 microns, so that a rough surface is formed to enhance the adhesive force between the inner wall surface of the inner container body and the graphene coating; after the internal sand blasting treatment, the surface of the inner wall of the liner body is subjected to oxidation treatment by an anodic oxidation method, and the oxidation treatment can improve the corrosion resistance, the wear resistance and the hardness of the liner body; then, performing bottom oil spraying treatment on the inner container body, wherein the type of the bottom oil is KF-8622-5000B, and the thickness is more than 12 mu m; and after the base oil is sprayed, baking for 5min at the temperature of 200 ℃, and drying the base oil. Spraying the uniformly mixed coating on the inner wall surface of the liner body by using a spray gun communicated with an air compressor under the normal temperature condition, wherein a 71# spray gun (the caliber of a nozzle is 1.5mm) is used; and finally, placing the sprayed inner container body in an environment at 200 ℃ for curing for 30min, and finishing spraying. By spraying the coating on the inner wall of the inner container body through the process, the formed graphene coating can be tightly attached to the inner wall of the inner container body into a whole, and a falling-off field can not occur, so that the food safety of household personnel is ensured.
Then, coating the uniformly mixed coating on the outer wall of the inner container body, and the method comprises the following specific steps: the surface of the outer wall of the inner container body is cleaned and dried fully, and the impurities, floating dust and the like on the outer surface of the inner container body are mainly removed so as to avoid influencing the subsequent spraying treatment; secondly, carrying out external sand blasting process treatment on the cleaned and dried inner container body by adopting carborundum (corundum) with the grain size of 70-80 meshes, wherein after the sand blasting treatment, the surface roughness of the outer wall surface of the inner container body reaches Ry 50-120 mu m, and the aim of forming a rough surface is to enhance the adhesive force between the outer wall surface of the inner container body and the graphene coating; spraying the uniformly mixed coating on the surface of the outer wall of the inner container body by using a spray gun communicated with an air compressor under the condition of normal temperature, wherein a 71# spray gun (the caliber of the spray nozzle is 1.5mm) is used, the spraying thicknesses of different positions of the outer wall of the inner container body are different in the spraying process, the thickness range of the sprayed graphene coating is 10-30 mu m on the bottom and the side surface of the inner container body, but the thickness of the sprayed graphene coating at the radian junction of the bottom and the side surface is thicker than the corresponding positions of the bottom and the side surface and ranges from 25-35 mu m; and finally, placing the sprayed inner container body in an environment at 200 ℃ for curing for 30min, and finishing spraying.
In addition, in a third specific embodiment, first, the coating is configured according to the following components by mass percent: 10% of graphene powder, 65% of polytetrafluoroethylene, 4% of zinc oxide and 5% of vinyl fluoride resin, and treating the coating by an ultrasonic homogenization method, wherein the treatment time of the ultrasonic homogenization method is 40min, and the ultrasonic frequency is 80 KHz.
Then, the evenly mixed coating is coated on the inner wall of the inner container body, and the method comprises the following specific steps: the surface of the inner wall of the inner container body is cleaned and dried fully, and the impurities, floating dust and the like on the inner surface of the inner container body are mainly removed so as to avoid influencing the subsequent spraying treatment; secondly, carrying out internal sand blasting process treatment on the cleaned and dried inner container body by adopting carborundum (corundum) with the grain size of 70-80 meshes, wherein the treatment thickness is 8 microns, and after sand blasting treatment, the surface roughness of the inner wall surface of the inner container body reaches Ry 50-120 microns, so that a rough surface is formed to enhance the adhesive force between the inner wall surface of the inner container body and the graphene coating; after the internal sand blasting treatment, the surface of the inner wall of the liner body is subjected to oxidation treatment by an anodic oxidation method, and the oxidation treatment can improve the corrosion resistance, the wear resistance and the hardness of the liner body; then, performing bottom oil spraying treatment on the inner container body, wherein the type of the bottom oil is KF-8622-5000B, and the thickness is more than 12 mu m; and after the base oil is sprayed, baking for 8min at the temperature of 220 ℃, and drying the base oil. Spraying the uniformly mixed coating on the inner wall surface of the liner body by using a spray gun communicated with an air compressor under the normal temperature condition, wherein a 71# spray gun (the caliber of a nozzle is 1.5mm) is used; and finally, placing the sprayed inner container body in an environment at 250 ℃ for curing for 50min, and finishing spraying. By spraying the coating on the inner wall of the inner container body through the process, the formed graphene coating can be tightly attached to the inner wall of the inner container body into a whole, and a falling-off field can not occur, so that the food safety of household personnel is ensured.
Then, coating the uniformly mixed coating on the outer wall of the inner container body, and the method comprises the following specific steps: the surface of the outer wall of the inner container body is cleaned and dried fully, and the impurities, floating dust and the like on the outer surface of the inner container body are mainly removed so as to avoid influencing the subsequent spraying treatment; secondly, carrying out external sand blasting process treatment on the cleaned and dried inner container body by adopting carborundum (corundum) with the grain size of 70-80 meshes, wherein after the sand blasting treatment, the surface roughness of the outer wall surface of the inner container body reaches Ry 50-120 mu m, and the aim of forming a rough surface is to enhance the adhesive force between the outer wall surface of the inner container body and the graphene coating; spraying the uniformly mixed coating on the surface of the outer wall of the inner container body by using a spray gun communicated with an air compressor under the condition of normal temperature, wherein a 71# spray gun (the caliber of the spray nozzle is 1.5mm) is used, the spraying thicknesses of different positions of the outer wall of the inner container body are different in the spraying process, the thickness range of the sprayed graphene coating is 10-30 mu m on the bottom and the side surface of the inner container body, but the thickness of the sprayed graphene coating at the radian junction of the bottom and the side surface is thicker than the corresponding positions of the bottom and the side surface and ranges from 25-35 mu m; and finally, placing the sprayed inner container body in an environment at 250 ℃ for curing for 50min, and finishing spraying.
Preferably, the present embodiment further provides an electromagnetic cooker, including the graphene inner container as described above.
Specifically, the electromagnetic cooker provided by the embodiment adopts the graphene inner container, so that in the using process, the energy consumption is low, and the cooking efficiency can be greatly improved. When the electromagnetic cooker is used for an electric cooker and cooks rice, the heating speed is increased and the heating is more uniform, the heat conductivity coefficient of the inner container of the existing electric cooker is improved, the problem that the cooker is burnt due to local overheating of the cooker bottom is solved, the taste of food is greatly improved, and good use experience is brought to a user.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A graphene liner comprises a liner body and is characterized in that,
the graphene coating is arranged on the inner wall and/or the outer wall of the inner container body;
the graphene coating comprises the following components in percentage by mass: 3-10% of graphene powder and 50-65% of polytetrafluoroethylene.
2. The graphene inner container according to claim 1,
the graphene coating further comprises the following components in percentage by mass: 3% -5% of heat-conducting powder and 2% -5% of vinyl fluoride resin, wherein the heat-conducting powder contains any one of aluminum oxide, magnesium oxide and zinc oxide.
3. The graphene inner container according to claim 1,
the particle size of the graphene powder is 10-30 nm;
and/or the graphene powder is physically-processed graphene powder, and the physically-processed graphene powder comprises graphene oxide powder.
4. The graphene inner container according to claim 1,
the thickness of the graphene coating on the inner wall of the inner container body is 10-30 microns;
and/or the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall of the inner container body is smaller than that of the graphene coating on the outer wall corresponding to the joint part of the bottom and the side wall, the thickness of the graphene coating on the outer wall corresponding to the bottom and the side wall is 10-30 μm, and the thickness of the graphene coating on the outer wall corresponding to the joint part of the bottom and the side wall is 25-35 μm.
5. A method for preparing the graphene inner container according to any one of claims 1 to 4, which comprises the following steps:
s1, preparing a uniformly mixed coating, wherein the coating is prepared from the following components in percentage by mass: 3% -10% of graphene powder, 50% -65% of polytetrafluoroethylene, 3% -5% of heat-conducting powder and 2% -5% of vinyl fluoride resin, wherein the heat-conducting powder contains any one of aluminum oxide, magnesium oxide and zinc oxide;
s2, coating the paint on the inner wall and/or the outer wall of the inner container body;
and S3, drying and curing the mixture, and finishing the process.
6. The production method according to claim 5,
and S1, treating the coating by adopting an ultrasonic uniform method, wherein the treatment time of the ultrasonic uniform method is 30-40 min, and the ultrasonic frequency is 20-80 KHz.
7. The production method according to claim 5,
the step of coating the paint on the inner wall of the inner container body in S2 includes:
carrying out sand blasting treatment on the inner wall surface of the cleaned and dried inner container body to enable the surface roughness of the inner wall surface to reach Ry 50-120 mu m;
sequentially carrying out oxidation treatment and bottom oil spraying treatment on the inner wall surface of the inner container body, baking for 2-8 min at the temperature of 150-220 ℃ after the bottom oil spraying is finished, and drying the bottom oil;
and spraying the coating on the inner wall surface of the inner container body.
8. The production method according to claim 5,
the step of coating the paint on the outer wall of the inner container body in S2 includes:
carrying out sand blasting treatment on the outer wall surface of the cleaned and dried inner container body to enable the surface roughness of the outer wall surface to reach Ry 50-120 mu m;
and spraying the coating on the surface of the outer wall of the inner container body.
9. The production method according to claim 5,
the step of performing the drying and curing process in S3 includes:
and curing the inner container body coated with the coating for 25-50min at the temperature of 180-250 ℃.
10. An electromagnetic cooker, characterized by comprising the graphene inner container according to any one of claims 1 to 4.
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