CN110537824A - Inner pot suitable for electromagnetic heating, preparation method thereof and cooking utensil - Google Patents
Inner pot suitable for electromagnetic heating, preparation method thereof and cooking utensil Download PDFInfo
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- CN110537824A CN110537824A CN201810523194.1A CN201810523194A CN110537824A CN 110537824 A CN110537824 A CN 110537824A CN 201810523194 A CN201810523194 A CN 201810523194A CN 110537824 A CN110537824 A CN 110537824A
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- iron
- pot body
- coating
- anticorrosive coating
- pot
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 26
- 238000010411 cooking Methods 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 91
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000000576 coating method Methods 0.000 claims abstract description 57
- 239000011248 coating agent Substances 0.000 claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 21
- 239000008199 coating composition Substances 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 238000005260 corrosion Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 20
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 9
- 239000012752 auxiliary agent Substances 0.000 claims description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- 239000010452 phosphate Substances 0.000 claims description 5
- 229920002050 silicone resin Polymers 0.000 claims description 5
- 239000004695 Polyether sulfone Substances 0.000 claims description 3
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 3
- 229920006393 polyether sulfone Polymers 0.000 claims description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000003449 preventive effect Effects 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 40
- 238000005536 corrosion prevention Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000003518 caustics Substances 0.000 description 5
- 238000007788 roughening Methods 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- CDRCPXYWYPYVPY-UHFFFAOYSA-N iron(2+) oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+2].[Fe+2].[Fe+2] CDRCPXYWYPYVPY-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- CLVOYFRAZKMSPF-UHFFFAOYSA-N n,n-dibutyl-4-chlorobenzenesulfonamide Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(Cl)C=C1 CLVOYFRAZKMSPF-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- A47J27/002—Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for 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
-
- 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
-
- 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
Abstract
The invention relates to the field of household appliances, in particular to an inner pot suitable for electromagnetic heating, a preparation method thereof and a cooking appliance. The inner pot suitable for electromagnetic heating comprises: an iron-based pan body (1); an aluminum layer (2) and a non-stick coating (3) which are sequentially formed on the inner side of the iron-based pot body (1); and a tri-iron tetroxide layer (4) and an anti-corrosion coating (5) which are sequentially formed on the outer side of the iron-based pot body (1); wherein the anticorrosive coating (5) is formed by an anticorrosive coating composition containing a resin binder, aluminum powder, an aluminum powder alignment aid and an antirust aid. The inner pot suitable for electromagnetic heating has better corrosion resistance.
Description
Technical Field
the invention relates to the field of household appliances, in particular to an inner pot suitable for electromagnetic heating, a preparation method thereof and a cooking appliance.
Background
At present, the development trend of middle and high-end electric rice cookers and pressure cookers is IH (electromagnetic induction) heating, because IH heating not only has high power, heating process accessible program control, realizes the multistage heating, the utility of intelligence heating, IH heating compares traditional chassis heating more and has three-dimentional moreover, the numerous advantages that the utilization ratio of efficiency is higher, consequently, the heating methods of mainstream high-end rice cookers, pressure cookers and the like all adopt IH heating in the market.
In the IH heating, eddy current is generated by the coil disc, and then the metal liner cuts magnetic lines of force to generate heat, so that heating is realized. Therefore, the inner container of the rice cooker or the pressure cooker needs to be made of magnetic conductivity materials, the traditional magnetic conductivity materials are alloys such as iron, nickel, low-carbon steel and the like, and cast iron pots, 430 stainless steel-aluminum alloy composite pots and the like are most used in the market.
the iron pan mainly aims to solve the corrosion prevention problem that the iron pan is easy to rust, and the conventional corrosion prevention scheme comprises oxidation, nitridation and phosphorization processes which can generate a large amount of waste water to cause environmental pollution. Moreover, the phosphating film generated by the phosphating process can be pulverized at the temperature of more than 300 ℃ and loses the protection effect, and the inner surface of the electric cooker needs to be subjected to high temperature of more than 380 ℃ when being coated with the non-stick coating. Therefore, it is urgently needed to develop a new iron pan corrosion prevention process to produce an IH inner pan with a better corrosion prevention function.
disclosure of Invention
The invention aims to solve the problems that the existing iron pan corrosion prevention process causes environmental pollution and the corrosion prevention performance of a corrosion prevention coating is poor, and provides an inner pan suitable for electromagnetic heating, a preparation method thereof and a cooking utensil.
In order to achieve the above object, an aspect of the present invention provides an inner pot adapted for electromagnetic heating, the inner pot comprising:
An iron-based pan body;
An aluminum layer and a non-stick coating which are sequentially formed on the inner side of the iron-based pot body; and
A ferroferric oxide layer and an anticorrosive coating which are sequentially formed on the outer side of the iron-based pot body;
The anti-corrosion coating is formed by an anti-corrosion coating composition containing a resin binder, aluminum powder, an aluminum powder directional arrangement aid and an anti-rust aid.
preferably, in the anticorrosive coating composition, the weight ratio of the resin binder to the aluminum powder is 1:1 to 2:1, more preferably 1.5:1 to 2: 1.
preferably, in the anticorrosive coating composition, the aluminum powder alignment aid is 20 to 50 wt%, more preferably 20 to 30 wt% of the aluminum powder.
Preferably, in the anticorrosive coating composition, the rust-preventive auxiliary is 5 to 30% by weight, more preferably 10 to 15% by weight, of the resin binder.
Preferably, the resin binder is at least one selected from the group consisting of polyethersulfone resin, silicone resin, and polyphenylene sulfide.
Preferably, the aluminum powder has a flake structure, and the particle size range D50 is 5-100 microns, more preferably 5-40 microns.
Preferably, the antirust auxiliary agent is a phosphate antirust auxiliary agent and/or a silicate antirust auxiliary agent.
Preferably, the magnetite layer is formed by baking the outer surface of the iron-based pan body subjected to roughening treatment.
Preferably, the thickness of the anti-corrosion coating is 20-40 μm.
Preferably, the thickness of the non-stick coating is 20-50 μm.
In a second aspect, the present invention provides a method for preparing the inner pot, which comprises the following steps:
(1) Forming an aluminum layer on the inner side of the iron-based pot body;
(2) Coarsening the inside and outside of the pot body, and then baking the outer side surface to form a ferroferric oxide layer on the outer side surface of the pot body;
(3) Forming a non-stick coating on the aluminum layer on the inner side of the pot body; and
(4) An anticorrosive coating is formed on the ferroferric oxide layer outside the pot body by adopting the anticorrosive coating composition.
preferably, in step (1), the method of forming the aluminum layer is cold spray coating, thermal spray coating, or stamping.
Preferably, in the step (2), the baking treatment conditions include: the temperature is 380 ℃ and 450 ℃, and the time is 10-100 minutes.
In a third aspect of the invention, a cooking appliance is provided, and the inner pot of the cooking appliance is the inner pot provided by the invention.
In the inner pot suitable for electromagnetic heating, the ferroferric oxide layer is used as the middle layer, so that the inner pot has an antirust effect on one hand, and also has the function of connecting the pot body and the anticorrosive coating on the other hand, and the inner pot has excellent anticorrosive performance by matching with the anticorrosive coating material.
Moreover, in the present invention, the anticorrosive coating can be formed by a conventional coating process, and wastewater is not generated in the entire process, thereby not causing environmental pollution.
Drawings
Fig. 1 is a schematic layer structure diagram of an inner pot suitable for electromagnetic heating according to the invention.
Description of the reference numerals
1 iron-based pot body 2 aluminum layer
3 non-stick coating 4 iron tetraoxide layer
5 anticorrosive coating 51 aluminium powder
52 antirust additive
Detailed Description
the endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
As shown in fig. 1, the inner pot suitable for electromagnetic heating according to the present invention comprises:
an iron-based pot body 1;
an aluminum layer 2 and a non-stick coating 3 which are sequentially formed on the inner side of the iron-based pot body 1; and
A ferric oxide layer 4 and an anticorrosive coating 5 which are sequentially formed on the outer side of the iron-based pot body 1;
Wherein the anticorrosive coating 5 is formed of an anticorrosive coating composition containing a resin binder, aluminum powder 51, an aluminum powder alignment aid, and a rust-preventive aid 52.
In the inner pot of the invention, an aluminum layer 2 is formed on the inner side surface of an iron-based pot body 1, and a non-stick coating 3 is formed on the surface of the aluminum layer 2. Through setting up like this, on the one hand can improve the cohesion of non-stick coating through increasing the aluminium lamination, and on the other hand forms the aluminium lamination and can avoid producing shielding effect to electromagnetic induction at the pot body inboard.
In the anticorrosive coating 5, under the action of the aluminum powder alignment auxiliary agent, the aluminum powder 51 is regularly arranged in the same direction, and a laminated state is formed on the surface of the coating, so that the path of corrosive substances penetrating the coating can be prolonged; the potential of the aluminum is lower than that of the iron, and the aluminum and the iron form a primary battery effect, so that the corrosion can be further relieved; furthermore, the rust preventive auxiliary can prevent corrosive substances from reacting with iron, thereby further improving the corrosion resistance.
In the anticorrosive coating composition, the weight ratio of the resin binder to the aluminum powder may be 1:1 to 2:1, preferably 1.5:1 to 2: 1.
In the anticorrosive coating composition, the aluminum powder alignment aid may be 20 to 50% by weight, preferably 20 to 30% by weight, of the aluminum powder.
In the anticorrosive coating composition, the rust-preventive auxiliary may be 5 to 30% by weight, preferably 10 to 15% by weight, of the resin binder.
In the present invention, the resin binder may be a resin binder that is conventional in the art. Preferably, the resin binder is a resin that remains stable for extended periods of time at 200-300 ℃. More preferably, the resin binder is at least one selected from the group consisting of polyethersulfone resin, silicone resin, and polyphenylene sulfide. In one embodiment, the resin binder is a commercially available polyester modified silicone resin HTL 3.
In the present invention, the aluminum powder is preferably a flake structure. When the aluminum powder is of a sheet structure, the aluminum powder is more favorable for forming a laminated state, so that better corrosion resistance is more favorable. It is further preferred that the aluminum powder of the flake structure has a particle size range D50 of 5 to 100 micrometers, and still further preferred 5 to 40 micrometers. In a specific embodiment, the aluminum powder is selected from 1009# of commercially available Zhuang color aluminum paste.
In the present invention, the aluminum powder alignment aid may be a conventional choice in the art. Preferably, the aluminum powder alignment aid is commercially available Raybo41 serving as a American Ribao aluminum powder alignment agent.
In the present invention, the rust-preventive auxiliary is preferably a phosphate rust-preventive auxiliary and/or a silicate rust-preventive auxiliary. The phosphate antirust additive and the silicate antirust additive can react with corrosive substances, so that the corrosive substances can be prevented from reacting with the iron-based pot body after penetrating through the coating, and meanwhile, the phosphate or the silicate can form a compact phosphating film or an iron silicate film on the surface of the iron-based pot body, so that the corrosive substances are further prevented from invading.
In the present invention, it is preferable that the magnetite layer 4 is formed by baking the outer surface of the iron-based pot body subjected to the roughening treatment. More preferably, the outer surface of the iron-based pot body subjected to roughening treatment is placed at 380-450 ℃ for baking for more than 10 minutes under the ventilation condition, in this case, iron materials on the iron-based surface react with oxygen to generate a compact ferric oxide layer, and the iron-based surface is changed from grey metal color to blue color.
in the present invention, the thickness of the magnetite layer 4 may be 0.5 to 3 μm, and specifically, may be any value in the range of, for example, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.7 μm, 3 μm, and any two of these values.
In the present invention, the thickness of the corrosion prevention coating layer 5 may be 20 to 40 μm.
In the present invention, the thickness of the non-stick coating 3 is not particularly limited and may be selected within a conventional range. Preferably, the thickness of said non-stick coating 3 is between 20 and 50 μm.
in the present invention, the non-stick coating 3 may have a single layer structure or a structure having two or more layers. The material of the non-stick coating 3 is not particularly limited, and may be a non-stick coating that is conventional in the art, and may be at least one of a fluororesin coating and a ceramic non-stick coating, for example.
In the invention, the material of the iron-based pot body 1 can be refined iron, low-carbon steel and the like.
In the present invention, the aluminum layer 2 may be formed by cold spray coating, thermal spray coating, or stamping.
the invention also provides a method for preparing the inner pot, which comprises the following steps:
(1) Forming an aluminum layer on the inner side of the iron-based pot body;
(2) Coarsening the inside and outside of the pot body, and then baking the outer side surface to form a ferroferric oxide layer on the outer side surface of the pot body;
(3) Forming a non-stick coating on the aluminum layer on the inner side of the pot body; and
(4) An anticorrosive coating is formed on the ferroferric oxide layer outside the pot body by adopting the anticorrosive coating composition.
In the method, the ferric oxide layer is firstly generated, and then the non-stick coating is formed on the inner side of the pot body, so that the moisture in the non-stick coating can be prevented from being absorbed by the iron-based surface to generate ferric oxide rust, the corrosion resistance of the outer surface is influenced, and the adhesive force of the outer surface coating is also influenced. Therefore, the method can protect the iron base from rusting when the non-stick coating is coated, and simultaneously greatly improves the corrosion resistance of the anti-rust coating.
In the method of the invention, the anti-corrosion coating on the outer surface is coated after the non-stick coating on the inner surface is coated, so that the anti-corrosion coating on the outer surface can be ensured to splash to the inner surface, and the performance of the coating on the inner surface is influenced.
In step (1), the method of forming the aluminum layer may be cold spray coating, thermal spray coating, or stamping. Preferably, the aluminum layer is formed by stamping. In the composite structure of the iron-based pot body and the aluminum layer formed by stamping, the total thickness of the iron layer and the aluminum layer can be 1.5-4mm, and the thickness of the iron layer accounts for 50-90% of the total thickness of the iron layer and the aluminum layer. Under the condition, the inner pot has better electromagnetic induction heating performance, is thicker and heavier, and has balanced overall heat preservation effect and heat transfer effect.
In the step (2), the process conditions of the baking may include: the temperature is 380 ℃ and 450 ℃, and the time is more than 10 minutes, preferably 10-100 minutes. The baking process is preferably carried out with ventilation.
In the step (2), the roughening treatment may be sand blasting treatment, shot blasting roughening treatment, or the like.
In one embodiment, the operation process of step (1) and step (2) comprises: after the cooker is subjected to punch forming, cleaning and removing stamping oil, drying, performing internal and external sand blasting or shot blasting for coarsening and rust removal, then placing the cooker in a baking line at the temperature of 380-450 ℃ for baking for more than 10 minutes under the condition of ventilation, wherein the cooker is placed in a high-temperature furnace for baking as soon as possible after coarsening treatment, otherwise the iron surface absorbs moisture in the air to generate oxidation, the formation of a ferroferric oxide layer is influenced, and the preferable time for placing the cooker in the high-temperature furnace is less than 4 hours after coarsening treatment.
the invention also provides a cooking appliance, and the inner pot of the cooking appliance is the inner pot suitable for electromagnetic heating provided by the invention. In the present invention, the cooking appliance may be a pressure cooker, an electric cooker, or the like.
the present invention is further described in detail by the following examples, but the scope of the present invention is not limited thereto.
Example 1
Forming an aluminum layer on the inner side of the iron-based pot body by punch forming, cleaning to remove stamping oil, drying, carrying out internal and external sand blasting and rust removal, and placing in a baking line at the temperature of 380 plus 450 ℃ for baking for more than 10 minutes under the condition of ventilation after sand blasting. Then, a non-stick coating is formed on the aluminum layer on the inner side of the pot body through spraying, and then an anticorrosive coating is formed on the ferroferric oxide layer on the outer side of the pot body through spraying by adopting an anticorrosive coating composition, so that the inner pot A1 is prepared. Wherein the composition of the used anticorrosive coating composition is as follows: selecting 40 wt% of polyester modified silicone resin HTL3 (purchased from Yingchuang corporation, brand number HTL 3); zhuancai aluminum paste 1009# (from Shenzhen Shuizi Co., Ltd.), 20 wt%; graves silica rust inhibitor C303, 5 wt%; 1.5 wt% of rayleigh aluminum powder directing agent raybo 41; the balance being solvent.
Comparative example 1
An inner pot was manufactured as in example 1, except that high-temperature baking was not performed after the sand blasting to form a tri-iron tetroxide layer, but non-stick coating was directly formed on the inner side of the pot body and anti-corrosion coating was formed on the outer side, thereby manufacturing an inner pot D1.
Comparative example 2
An inner pot was prepared as in example 1, except that the coating material sprayed on the outside of the pot body was a general silicone coating (available from warf corporation, usa, under the designation K7338), to thereby obtain an inner pot D2.
test example
The corrosion resistance of the inner pots prepared in the above examples and comparative examples was tested under the test conditions of 60 c and a brine concentration of 5 wt% in a salt spray test chamber, and the test results are shown in table 1 below.
TABLE 1
As can be seen from the data in Table 1, the inner pot suitable for electromagnetic heating has better corrosion resistance.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications may be made to the technical solution of the invention, and in order to avoid unnecessary repetition, various possible combinations of the invention will not be described further. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (11)
1. an inner pot suitable for electromagnetic heating, characterized in that, the inner pot comprises:
an iron-based pan body (1);
An aluminum layer (2) and a non-stick coating (3) which are sequentially formed on the inner side of the iron-based pot body (1); and
A ferroferric oxide layer (4) and an anticorrosive coating (5) which are sequentially formed on the outer side of the iron-based pot body (1);
Wherein the anticorrosive coating (5) is formed by an anticorrosive coating composition containing a resin binder, aluminum powder, an aluminum powder alignment aid and an antirust aid.
2. The inner pan according to claim 1, wherein in the anticorrosive coating composition, a weight ratio of the resin binder to the aluminum powder is 1:1 to 2:1, preferably 1.5:1 to 2: 1.
3. The inner pot according to claim 1, wherein the aluminum powder alignment aid is 20 to 50 wt%, preferably 20 to 30 wt% of the aluminum powder in the anticorrosive coating composition.
4. The inner pan according to claim 1, wherein the rust preventive auxiliary is 5 to 30 wt%, preferably 10 to 15 wt% of the resin binder in the anticorrosive coating composition.
5. the inner pan according to any one of claims 1 to 4, wherein the resin binder is selected from at least one of polyethersulfone resin, silicone resin, and polyphenylene sulfide;
preferably, the aluminum powder has a flaky structure, and the particle size range D50 is 5-100 micrometers, preferably 5-40 micrometers;
preferably, the antirust auxiliary agent is a phosphate antirust auxiliary agent and/or a silicate antirust auxiliary agent.
6. Inner pot according to any of claims 1-4, characterized in that the layer (4) of magnetite is formed by baking the outer surface of the roughened iron-based pot body.
7. inner pot according to any one of claims 1-4, characterized in that the thickness of the anti-corrosion coating (5) is 20-40 μm and the thickness of the non-stick coating (3) is 20-50 μm.
8. a method of making the inner pan of any one of claims 1-7, the method comprising the steps of:
(1) forming an aluminum layer on the inner side of the iron-based pot body;
(2) coarsening the inside and outside of the pot body, and then baking the outer side surface to form a ferroferric oxide layer on the outer side surface of the pot body;
(3) Forming a non-stick coating on the aluminum layer on the inner side of the pot body; and
(4) An anticorrosive coating is formed on the ferroferric oxide layer outside the pot body by adopting the anticorrosive coating composition.
9. The method of claim 8, wherein in step (1), the method of forming the aluminum layer is cold spray coating, thermal spray coating, or stamping.
10. the method of claim 8, wherein in step (2), the processing conditions of the baking include: the temperature is 380 ℃ and 450 ℃, and the time is 10-100 minutes.
11. A cooking appliance, characterized in that the inner pot of the cooking appliance is the inner pot according to any one of claims 1-7.
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| CN201810523194.1A CN110537824A (en) | 2018-05-28 | 2018-05-28 | Inner pot suitable for electromagnetic heating, preparation method thereof and cooking utensil |
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| CN201810523194.1A CN110537824A (en) | 2018-05-28 | 2018-05-28 | Inner pot suitable for electromagnetic heating, preparation method thereof and cooking utensil |
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