JP3471562B2 - Cooker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device such as a hot plate, and more particularly to a cooking device having both abrasion resistance and non-adhesion. 2. Description of the Related Art Conventionally, a cooking surface of a heating cooker such as a hot plate which requires non-adhesiveness has a coating or a coating mainly composed of a mixture of a fluororesin and a heat-resistant synthetic resin. In addition, a coating is performed in which a paint mainly containing a synthetic resin having heat resistance is used as an undercoat, and a paint mainly containing a fluororesin is used as an overcoat. [0003] The coating of the cooking surface of a cooking device such as a hot plate has a heat resistance, a non-adhesive property and a resistance not to be easily scratched or peeled off by a metal spatula or the like. Wear resistance is required. [0004] However, a coating containing a mixture of a conventional fluororesin and a heat-resistant synthetic resin as a main component, or a paint containing a heat-resistant synthetic resin as a main component is used as an undercoat to form a paint containing a fluororesin as a main component. Although the overcoating is excellent in non-adhesiveness and adhesion to a substrate, it has a drawback of poor abrasion resistance, such as damage to the substrate when rubbed with a metal product. [0005] In order to solve this drawback, ceramics are sprayed on the substrate, but the process is complicated and equipment is required, which increases the cost. [0006] The present invention is intended to solve such a conventional problem, and has a wear resistance which is not easily scratched or peeled off by a metal spatula or the like even without a thermal spray treatment of a substrate. It is an object of the present invention to provide a cooking device such as a hot plate having a non-adhesive coating excellent in heat resistance. SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a method for manufacturing an aluminum or aluminum alloy.
Blasted on the cooking surface to be blasted
Polyamideimide resin, spherical ceramic pigment 3 ~
Contains 30% and potassium hexatitanate whiskers 1 to 15%
Undercoat layer and potassium hexatitanate whisker in 0.0
Non-adhesive consisting of fluororesin topcoat containing 5-5%
By forming the coating, a non-adhesive coating excellent in abrasion resistance, which is not easily scratched or peeled off by a metal spatula or the like, can be formed in the cooking device. DETAILED DESCRIPTION OF THE INVENTION The invention described in claim 1 of the present invention is a cooking method comprising aluminum or an aluminum alloy.
Blasting the surface, and pouring the blasted surface
With rimamide imide resin, spherical ceramic pigment 3-30%
Wear resistance containing 1 to 15% of potassium hexatitanate whiskers
Undercoat layer with excellent properties and potassium hexatitanate whisker
On non-adhesive fluororesin containing 0.05 to 5%
By forming a non-adhesive coating consisting of a coating layer and baking at a temperature equal to or higher than the melting point of the fluororesin, it has an effect of forming a non-adhesive coating having excellent wear resistance. (Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. In general, the non-stick coating of the present invention is formed by coating a base material 1 made of aluminum or an aluminum alloy with a predetermined component for each of the undercoat layer 2 and the overcoat layer 3 in a solvent. By doing.
A dispersant, a viscosity modifier, and a leveling agent can be added to facilitate application. The undercoat layer 2 includes a spherical ceramic pigment a and a potassium hexatitanate whisker b, and the overcoat layer 3 is composed of a potassium hexatitanate whisker and an adhesive paint such as a fluororesin. It is desirable that a blast treatment be performed in advance for the base treatment of the cooking surface of the base material 1 of the cooker made of aluminum or an aluminum alloy. The spherical ceramic pigment a refers to a hard material close to a true sphere, such as glass beads or spherical silica.
Among these, glass beads are fine glass powder blown into a high-temperature flame, which melts in a floating state and becomes spherical by its surface tension, and its shape is almost a true sphere. Since the surface is smooth, hard, and spherical, it is extremely unlikely to be deformed by external pressure. Those having an average particle diameter of 2 to 20 μm are preferably used. The potassium hexatitanate whisker b is an extremely fine fibrous single-crystal substance, and therefore increases the tensile strength and abrasion resistance by uniform reinforcement, and has an average fiber length of 5 to 30 μm. Is preferably used. The fluororesin referred to here is mainly polytetrafluoroethylene (PTFE) or tetrafluoroethylene-hexafluoropropylene copolymer (FE).
P), a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) alone or in a mixture is suitably used. In addition, the coating may contain, as coloring pigments, iron oxide coloring pigments such as petals, carbon black, titanium oxide and the like. In order to obtain strong adhesiveness and corrosion resistance, the most desirable blasting treatment is to use JIS R61 as an abrasive.
Alumina abrasive and black silicon carbide abrasive such as brown alumina abrasive, white alumina abrasive, light red alumina abrasive, crushed alumina abrasive, artificial emery abrasive, etc. The surface of the material is ground using a silicon carbide abrasive such as green silicon carbide abrasive, and the surface roughness is set to a center line average roughness (Ra) of 0.5.
This is the method described above. When glass beads are used as an abrasive,
Since the grinding effect of the material surface is small, even if the surface roughness is 0.5 or more in center line average roughness (Ra), strong adhesiveness cannot be obtained, which is not desirable. Further, iron-based abrasives such as steel grit, steel shot, and cut wire may remain on the material surface and generate rust, which is not desirable. The undercoat layer 2 is applied to the blasted cooking surface of the cooking device with a general electrostatic coating machine, an air spray gun or the like so that the coating thickness is 5 to 100 μm.
After drying at about 0 to 100 ° C., the overcoat layer 3 is similarly coated so as to have a coating thickness of 5 to 100 μm, preliminarily dried, and then fired at a temperature equal to or higher than the melting point of the fluorine resin. The spherical ceramic a can improve the hardness, and the potassium hexatitanate whisker b can improve the wear resistance. In order to evaluate the cooking surface of the cooking device prepared in this manner, cooking surfaces were formed in various mixing ratios, and comparative experiments were performed. As shown in (Table 1), sample 1 in the table
Or a mixture of fluororesins such as PTFE, PFA, FEP, etc. alone or a polyamideimide resin;
The spherical ceramic pigment and the potassium hexatitanate whisker were mixed at the ratios shown in Table 1 and stirred for 1 hour with a disper to prepare undercoat and topcoat paints. The spherical ceramic pigment used here is glass beads having SiO2 / Al2O3 as a main component and having an average particle diameter of 10 to 12 [mu] m, but other metal oxides having the same particle diameter can be applied. Blasting using an alumina abrasive (Ra: 2
~ 4) A coating is formed on the cooking surface of the hot plate made of aluminum die-cast by the above method, and the pencil hardness, abrasion resistance,
Non-stickiness and salt spray resistance were examined. The results are as shown in (Table 1). [Table 1] The pencil hardness is JIS K5400 / 8.
4.2 Evaluation was based on the pencil scratch value (hand scratch method).
Abrasion resistance was measured by dropping a few drops of salad oil on the cooking surface of a hot plate kept at 250 ° C, and adding 500 g to the attached metal spatula.
Is applied to the coating surface at an angle of 45 °, and 500
After reciprocating, the abrasion state of the coating film was evaluated.
There is no peeling of the coating film, △ indicates that there is peeling of the top coating film, ×
Indicates that almost the entire substrate is exposed. For non-adhesiveness, the operation of dripping sauteed meat on the cooking surface of a hot plate kept at 250 ° C., heating for 15 minutes, and wiping with a paper towel was repeated 50 times.
In the evaluation of the state of the coating film, ◎ indicates that the contaminants can be easily removed, and ○ indicates that some of the contaminants are sticky and cannot be removed unless they are strongly rubbed. The salt spray resistance is determined by adding an X-cut to the sample.
After conducting a test based on the salt spray resistance of IS.K5400.9.1 for 240 hours continuously, JIS.K5400.8.8.
It was evaluated by the X cut tape method of 5.3.
Indicates 10 points, and ○ indicates 8 points. Comparative Examples 1 to 3 are the same as Examples 1 to 6 except that spherical ceramic pigments and potassium hexatitanate whiskers are added at the ratios shown in Table 1. In the above description, the spraying treatment is not performed. However, in order to further improve the corrosion resistance and the wear resistance, the spraying treatment may be performed. FIG. 2 is a cross-sectional view of the cooking surface when the thermal spraying process is performed. Embodiment 2 FIG. 3 shows a second embodiment. On the cooking surface 1 of a heating cooker such as a hot plate made of aluminum or aluminum alloy, a paint having excellent wear resistance containing spherical ceramic pigment a and potassium hexatitanate whisker b, and a non-adhesive fluorine resin are used. A non-adhesive coating having excellent abrasion resistance is formed by applying a coating material as a one-layer coating film 2 and baking it at a temperature equal to or higher than the melting point of the fluorine resin. According to the present embodiment, the single-layer structure simplifies the coating process and reduces the cost. (Embodiment 3) FIG. 4 shows a third embodiment. An undercoat layer 2 having excellent wear resistance containing spherical ceramic pigment a and potassium hexatitanate whisker b is provided on a cooking surface 1 of a heating cooker such as a hot plate made of aluminum or an aluminum alloy.
Is applied, dried and fired, and then an overcoat layer 3 made of a highly non-adhesive fluorine resin containing a spherical ceramic pigment a and potassium hexatitanate whisker b is applied,
By baking at a temperature equal to or higher than the melting point of the fluorine resin, a non-adhesive coating having excellent wear resistance is formed. According to this embodiment, the hardness and abrasion resistance can be further improved by adding a spherical ceramic to the undercoat layer and the overcoat layer. Further, since the thickness of the cooking surface can be increased, it is possible to provide a heating cooker having a more durable cooking surface. According to the present invention, it is possible to provide an excellent heating cooker in which the cooking surface is not easily scratched or peeled off by a metal spatula or the like. Especially with regard to wear resistance
It has a remarkable effect. Therefore, it is more resistant than before.
It was performed on the cooking surface of a heating cooker that required abrasion
The ceramic spraying process can be eliminated,
The strike is also cheaper. In addition, use two layers
Can increase the thickness of the cooking surface,
And a heating cooker having a cooking surface with good durability.
Can be

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged cross-sectional view of a cooking surface of a heating cooker according to a first embodiment of the present invention. FIG. FIG. 3 is an enlarged sectional view of the cooking surface of the cooking device according to the second embodiment of the present invention. FIG. 4 is an enlarged sectional view of the cooking surface of the cooking device according to the third embodiment of the present invention. Description: 1 Cookware substrate 2 Undercoat layer 3 Overcoat layer a Spherical ceramic pigment b Potassium hexatitanate whisker c Thermal spray treatment

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazumasa Okita 1109-7 Shizade, Kuramochi-cho, Nabari City, Mie Prefecture Inside (72) Inventor Hiroshi Nakano 1109-7 Shibaide, Kuramochi-cho, Nabari City, Mie Prefecture Okitsumo (56) References JP-A-5-245049 (JP, A) JP-A-1-141616 (JP, A) JP-A-9-67529 (JP, A) JP-A-63-168134 (JP, A) A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 36/02 A47J 27/00 106 A47J 37/06 311

Claims (1)

(57) [Claims 1] A cooking surface made of aluminum or an aluminum alloy is blasted, and the blasting process is performed.
Surface, polyamide-imide resin, spherical ceramic pigment 3
An undercoating layer containing 1 to 15% of potassium hexatitanate whiskers and 0.1 to 15% of potassium hexatitanate whiskers ;
A cooking device characterized by forming a non-adhesive coating comprising a fluororesin-based overcoat layer containing 0.5 to 5% .