JP3881112B2 - Gas appliance components - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas appliance member provided with a fluororesin coating layer.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to facilitate the wiping off of the broth that has been blown over during cooking, a gas appliance member such as a stove top plate or a soup pan is provided with a fluororesin coating layer.
[0003]
The conventional gas appliance member is formed by pressing a stainless steel plate such as SUS430 into a predetermined shape and providing a fluororesin coating layer on the surface of the stainless steel plate. Since the gas appliance member is used in a harsh environment because it is heated to a high temperature during cooking and frequently washed with a detergent, a bleaching agent, etc., the fluororesin coating layer is easily peeled off.
[0004]
Therefore, shot blasting is performed on the surface of the stainless steel plate to increase the surface area of the stainless steel plate, thereby improving the adhesion of the fluororesin. However, when the stainless steel plate is subjected to the shot blasting, there is a problem that the stainless steel plate is distorted like a drum.
[0005]
On the other hand, the stainless steel plate has a small elongation, and there is a problem that a predetermined shape may not be obtained when the pressing is performed. In order to solve the above problem, it is conceivable to use a steel plate for enamel that has a larger elongation than the stainless steel plate.
[0006]
However, when the fluororesin coating layer is provided on the surface of the steel plate for the enamel, the fluororesin coating layer is easily peeled off under severe use environment as in the case of the stainless steel plate, and the enamel is the material. There is an inconvenience that the steel plate itself has poor corrosion resistance.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a member for a gas appliance that includes such a fluororesin coating layer that eliminates such disadvantages and is easy to manufacture and excellent in adhesion.
[0008]
[Means for Solving the Problems]
In order to achieve such an object, the gas appliance member of the present invention comprises an inorganic oxide particle having an average particle size of 10 to 15 μm provided on the surface of a steel plate for enamel in a gas appliance member provided with a fluororesin coating layer. A first undercoat enamel layer formed by applying and firing a first enamel bran containing the second enamel, and an inorganic oxide particle having an average particle diameter of 20 to 25 μm provided on the first undercoat enamel layer. of enamel glaze is applied to the second undercoat enamel layer formed by firing, characterized in that it comprises a said fluorocarbon resin coating layer formed on the second undercoating enamel layer.
[0009]
Since the member for gas appliances of the present invention is made of a steel plate for enamel having a large elongation, a predetermined shape can be easily obtained by press working.
[0010]
In addition, the gas appliance member of the present invention is obtained by forming a fluororesin coating layer on the enamel steel plate, but the fluororesin generally has poor adhesion to other substances. Although it is advantageous for wiping, it is disadvantageous when a coating layer is formed on the surface of the steel sheet. Therefore, in the gas appliance member of the present invention, the undercoat enamel layer is first provided on the surface of the enamel steel plate, and the fluororesin coating layer is provided on the undercoat enamel layer.
[0011]
The undercoat enamel is applied to the surface of the enamel steel plate during general enamel processing to form a base, and the overcoat enamel and the enamel steel plate to be applied thereon are connected. Therefore, the said undercoat enamel layer can acquire the outstanding adhesiveness with respect to the steel plate for enamel.
[0012]
In addition, unlike the cosmetic wax, the undercoat enamel is composed of a enamel bran containing inorganic oxide particles having an average particle diameter in the above range, so that the formed undercoat enamel layer is porous, By providing the fluororesin coating layer thereon, an anchor effect for the fluororesin can be obtained. Accordingly, the fluororesin coating layer has excellent adhesion to the undercoat hollow layer.
[0013]
As a result, the fluororesin coating layer is in close contact with the steel plate for enamel through the undercoat enamel layer, and is not easily peeled even in a harsh environment where it is heated to a high temperature or frequently washed with a detergent, a bleach, or the like. An excellent effect can be achieved.
[0014]
The undercoat enamel layer may not be a porous layer suitable for obtaining an anchor effect on the fluororesin coating layer if the average particle size of the inorganic oxide contained in the enamel is less than 10 μm, When the average particle size of the inorganic oxide is larger than 25 μm, it becomes impossible to ensure adhesion to the steel plate for enamel.
[0015]
The undercoat enamel layer has a small particle size of the inorganic oxide on the side of the enamel steel plate in order to improve adhesion to the enamel steel plate, and on the fluororesin coating layer side to obtain the porous layer. in the particle diameter of the inorganic oxide that is greater.
[0016]
If the average particle size of the inorganic oxide contained in the first undercoat layer is smaller than 10 μm, the first undercoat enamel layer becomes difficult to become familiar with the second undercoat enamel layer. When the particle size is larger than 15 μm, the adhesion to the steel plate for enamel is lowered. Further, in the second undercoat enamel layer, if the average particle size of the inorganic oxide contained in the second enamel bran is less than 20 μm, a porous layer suitable for the anchor effect on the fluororesin may not be obtained. If the average particle size is larger than 25 μm, it becomes difficult to adjust to the first undercoat enamel layer.
[0017]
In the gas appliance member of the present invention, the fluororesin coating layer includes a primer layer made of a fluororesin containing a polyimide resin or a polyether sulfone resin between the undercoat enamel layer. .
[0018]
Although the fluororesin has poor adhesion to other substances as described above, the adhesion can be improved by containing other resins such as the polyimide resin and the polyether sulfone resin. Moreover, since the same kind of resins have affinity, the fluororesin coating layer can obtain excellent adhesion to the primer layer. Therefore, the adhesion of the fluororesin coating layer can be strengthened by providing the primer layer.
[0019]
Examples of the gas appliance member to which the present invention can be applied include a top plate of a stove or a juice receiver.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of a stove for a system kitchen provided with the fluororesin coating layer of the present embodiment, and FIG. 2 is an explanatory sectional view showing an example of the configuration of the fluororesin coating layer of the present embodiment. .
[0021]
As shown in FIG. 1, in the stove for a system kitchen, the virtues 4 are placed on the top plate 3 attached via the packing 2 on the upper surface of the stove body 1 containing a plurality of burners (not shown). It is like that. A grill 5 is provided on the side surface of the stove body 1.
[0022]
In the stove for the system kitchen shown in FIG. 1, 6 is a burner part, 7 is a burner ring that is crowned on the burner part 6, 8 is a combustion exhaust hole of the grill 5, and 9 is exhaust that is crowned on the exhaust hole 8. It is a guard.
[0023]
The top plate 3 of this embodiment is obtained by forming a fluororesin coating layer on a pressed steel plate for enamel. Next, the configuration will be described with reference to FIG.
[0024]
As shown in FIG. 2, in the top plate 3 of the present embodiment, an undercoat enamel layer 14 composed of a ground coat layer 12 and an undercoat layer 13 is provided on the surface of an enamel steel plate 11, and on the undercoat enamel layer 14. A fluororesin coating layer 16 is provided via the primer layer 15.
[0025]
As the enamel steel plate 11, a decarbonized steel plate for enamel specified in JIS G 3133 can be used. The decarbonized steel sheet for enamel contains 0.008% or less of carbon, 0.50% or less of manganese, 0.040% or less of phosphorus, and 0.040 or less of sulfur, according to the JIS regulations. Is 38% or more.
[0026]
The decarbonized steel sheet for enamel is significantly lower in carbon content than the stainless steel sheet SUS430 having a carbon content of 0.12% or less, and is suitable for enamel processing. In addition, when a steel plate with a high carbon content is subjected to a wax process, the hydrogen contained in the steel sheet is combined with the carbon in the steel sheet during firing and is taken into the steel sheet and is released again as hydrogen after cooling. Therefore, it becomes a cause of defects such as skipping of nails. Further, the decarbonized steel sheet for enamel is larger in elongation than the stainless steel sheet SUS430 is 22% or more, and is suitable for deep drawing by press working.
[0027]
Moreover, as the steel plate 11 for a boron, a boron-added enamel steel plate, a titanium-added enamel steel plate, a niobium-added enamel steel plate, a high-oxygen enamel steel plate, or the like may be used. As the steel plate 11 for enamel, for example, when the steel plate for high oxygen enamel is used, hydrogen contained in the enamel bran is trapped by being wrapped in oxygen in the steel plate, thereby preventing the occurrence of defects such as jumping of the claws. Can do.
[0028]
The ground coat layer 12 is coated with a first enamel bran containing inorganic oxide particles having an average particle diameter of 10 to 15 μm on the enamel steel plate 11 and fired to obtain a fired thickness of 90 to 120 μm. It is formed to be in the range. The inorganic oxide _{particles, SiO 2, B 2 O 3} , Al 2 O 3, CoO, NiO, alkali metal oxides, frits consisting of alkali earth metal oxides obtained by grinding in a ball mill or the like Use particles.
[0029]
When the thickness of the ground coat layer 12 is less than 90 μm, the enamel bran hardly adheres to the enamel steel plate 11, and in particular, the end face portion of the enamel steel plate 11 is burned out. Further, when the thickness of the ground coat layer 12 exceeds 120 μm, the undercoat layer 13 may have a defect such as a crack.
[0030]
The undercoat layer 13 is formed by applying a second enamel bran containing inorganic oxide particles having an average particle diameter of 20 to 25 μm on the ground coat layer 12 and baking the resultant, so that the thickness after baking is 100 to 100. It is formed to be in the range of 150 μm. As the inorganic oxide particles, particles obtained by pulverizing a frit made of SiO ₂ , B ₂ O ₃ , alkali metal oxide, alkaline earth metal oxide or the like with a ball mill or the like are used.
[0031]
If the thickness of the undercoat layer 13 is less than 100 μm, a sufficient anchor effect cannot be obtained for the fluororesin. Further, when the thickness of the undercoat layer 13 exceeds 150 μm, the difference in expansion coefficient from the ground coat layer 12 becomes clear and may be peeled off.
[0032]
The primer layer 15 contains a polyimide resin with respect to a fluororesin such as polytetrafluoroethylene, and the polyimide resin is included in the range of 40 to 70% by weight with respect to the total amount of the primer layer 15. When the content of the polyimide resin is less than 40% by weight with respect to the total amount of the primer layer 15, the effect of improving the adhesion of the primer layer 15 to the undercoat enamel layer 14 composed of the ground coat layer 12 and the undercoat layer 13 is obtained. If it exceeds 70% by weight, the adhesion between the primer layer 15 and the fluororesin layer 16 is poor.
[0033]
The primer layer 15 is formed so that the thickness after drying is in the range of 10 to 25 μm by applying a fluorine resin containing the polyimide resin on the undercoat layer 13 and drying it. If the thickness of the primer layer 15 is less than 10 μm, the adhesion to the fluororesin layer 16 is poor and causes defects, and if it exceeds 25 μm, it causes defects such as blistering and peeling of the fluorine coating (fluorine resin layer 16). The cost increases with it.
[0034]
The fluororesin layer 16 is formed so that the thickness after drying is in the range of 15 to 30 μm by applying a fluororesin such as polytetrafluoroethylene on the primer layer 15 and drying it. If the thickness of the fluororesin layer 16 is less than 15 μm, the cleaning performance against dirt is poor, and heat resistance to high temperatures during cooking and chemical resistance to detergents and bleaching agents may not be sufficiently obtained. This causes defects such as blistering and peeling of the coating film (fluororesin layer 16) and increases the cost.
[0035]
Next, the manufacturing method of the top plate 3 of this embodiment is demonstrated.
[0036]
When the top plate 3 is manufactured, first, a pretreatment is performed on the steel plate 11 for a hollow wax that has been formed into a predetermined shape by pressing. The pretreatment is carried out in the order of alkali degreasing, water washing, acid washing, water washing, nickel sulfate treatment and water washing, followed by neutralization treatment and further drying at a temperature of 150 to 300 ° C.
[0037]
Next, the first enamel brazing is applied by spray or the like on the enamel steel plate 11 that has been pretreated as described above. The first enamel bran is dried at 150 to 300 ° C. and then baked at 800 to 850 ° C. for 4 to 6 minutes to form the ground coat layer 12.
[0038]
Next, a second enamel is applied on the ground coat layer 12 formed as described above by spraying or the like. The second enamel bran is dried at 150 to 300 ° C. and then baked at 800 to 850 ° C. for 4 to 6 minutes to form the undercoat layer 13.
[0039]
Next, the blown steel plate 11 on which the ground coat layer 12 and the undercoat layer 13 have been formed as described above is air blown and further preliminarily dried at 40 to 80 ° C., and then the polyimide is coated on the undercoat layer 13. Apply fluorine resin. The resin can be applied by spray coating, dip coating, electrostatic coating, roll coating, curtain coating, centrifugal coating, or the like. Subsequently, the primer layer 15 is formed by drying the fluororesin containing the said polyimide coated as mentioned above at 80-100 degreeC for 15-20 minutes.
[0040]
Next, only the fluororesin is coated on the primer layer 15 and baked at 350 to 4000 ° C. for 20 to 25 minutes and dried to form the fluororesin coating layer 16. The fluororesin can be performed by the same method as the fluororesin containing polyimide.
[0041]
In this embodiment, the fluororesin coating layer 16 having a hardness of pencil hardness B was obtained by the manufacturing method. With respect to the adhesion of the fluororesin coating layer 16, the following items were tested.
(1) Adhesion strength: A grid-like cut at intervals of 1 mm is made in the fluororesin coating layer 16 with a cutter, and after sticking an adhesive tape, the tape is peeled off.
(2) Heat resistance: maintained at a temperature of 350 ° C. for 8 hours.
(3) Detergent resistance A: Immerse in a stock solution of neutral detergent (manufactured by Lion Corporation, trade name “Mama Lemon”) at 40 ° C. for 8 hours.
(4) Detergent resistance B: Immerse in a stock solution of chlorine bleach at room temperature (trade name “Kitchen Hiter” manufactured by Kao Corporation) for 8 hours.
(5) Abrasion resistance: The surface of the fluororesin coating layer 16 is rubbed 200 times with a nylon scrubber with abrasive (made by Kikuron Co., Ltd., trade name “Kikuron”).
(6) Contamination resistance: After dripping the contaminated liquid, it is heated and the cycle at which the scorch is wiped off is measured.
[0042]
The test items (1) to (5) were visually inspected after each test. As a result, the results were all good and no peeling of the fluororesin coating layer 16 was observed. Test item (6) was repeated up to 10 cycles, but it was possible to wipe off scorching.
[0043]
In the present embodiment, the top plate 3 of the stove for a system kitchen is described as an example. However, the present invention is a member for other gas appliances such as a saucer for a stove other than the system kitchen and a cooking dish for an oven. It can also be applied as a member in places where heat resistance, corrosion resistance, chemical resistance, and contamination resistance are required in harsh environments, such as an electric cooker and a dishwasher.
[0044]
In the present embodiment, a fluororesin containing a polyimide resin is used as the primer layer 16, but a fluororesin containing a polyether sulfone resin may be used instead of the polyimide resin.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a gas appliance member provided with a fluororesin coating layer.
FIG. 2 is an explanatory cross-sectional view showing a configuration example of a fluororesin coating layer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 ... Gas appliance member, 11 ... Steel plate for enamel, 12 ... First undercoat enamel layer, 13 ... Second undercoat enamel layer, 14 ... Undercoat enamel layer, 15 ... Primer layer, 16 ... Fluororesin coating layer

Claims (3)

In a gas appliance member comprising a fluororesin coating layer,
A first undercoat enamel layer formed by applying and firing a first enamel wax layer containing inorganic oxide particles having an average particle diameter of 10 to 15 μm provided on the surface of a steel plate for enamel, and the first undercoat enamel layer the second enamel glaze coating comprising inorganic oxide particles having an average particle diameter of 20~25μm provided on the, and the second undercoat enamel layer formed by firing, on the said second undercoat enamel layer A gas appliance member comprising: a fluororesin coating layer provided. The fluorine resin coating layer, the undercoat between the enamel layer, claim 1 Symbol mounting gas appliance member, characterized in that it comprises a primer layer comprising a fluorocarbon resin containing a polyimide resin or polyether sulfone resin. The gas appliance member according to claim 1 or 2, wherein the gas appliance member is a top plate of a stove or a juice receiver.

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