JP2000254582A - Surface treatment method and cooking equipment or heating equipment using this surface treatment method - Google Patents

Abstract

(57) [Problem] A conventional method of directly applying a water-repellent or oil-repellent coating material to a base material has a problem that heat durability is extremely poor depending on the type of the base material. are doing. SOLUTION: The surface of a substrate 1 is irradiated with high energy,
Next, a coating material constituting the first layer 4 is applied,
Further, as a method of applying a water-repellent or oil-repellent coating material constituting the second layer 5, a surface treatment method of an article that can enhance durability is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of subjecting a surface of a base material to electrical discharge machining or light treatment with ultraviolet rays (hereinafter referred to as light treatment) as high energy radiation, followed by coating treatment. The present invention relates to a method of forming a thin film on a surface to impart water repellency or oil repellency having excellent durability to a substrate, and a cooking appliance or a heating appliance using the method.

[0002]

2. Description of the Related Art Conventionally, a coating material having water repellency or oil repellency is applied to the surface of a substrate, or the surface of the substrate is subjected to corona discharge, plasma irradiation, or light treatment.
A method for applying a coating material having water repellency or oil repellency has been known.

[0003]

However, when a water-repellent or oil-repellent coating material is directly applied to the above-mentioned conventional substrate, the durability, particularly the thermal durability, is significantly deteriorated depending on the type of the substrate. There was something. For example, when the substrate is a metal, the hydroxyl groups (-O
H group) and poor adhesion to coating materials.
Further, there is a disadvantage that the coating film is deteriorated due to surface oxidation due to heat. Further, when the substrate is glass, there is a disadvantage that in a water or an environment where moisture is present, the alkali component is eluted from the substrate to promote the deterioration of the coating film.

The present invention has been made to solve such a conventional problem, and has as its object to improve the durability of a coating film.

[0005]

According to the structure of the present invention for solving the above-mentioned problems, the base material is subjected to corona discharge, plasma irradiation or light treatment as high energy irradiation to improve adhesion, and A protective film serving as a first layer is provided between the material and a coating material film having water repellency or oil repellency. That is, it has a first layer that improves the durability of the coating layer and a second layer that has a water-repellent or oil-repellent function, and the base material is subjected to high-energy discharge machining or light treatment with ultraviolet light. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, high energy irradiation means performing corona discharge, plasma irradiation, ultraviolet irradiation, etc. on the surface of a substrate, and the effect is to increase the surface energy of the substrate. This is to improve the wettability of water on the surface of the substrate.

[0007] The coating material of the first layer is a material for forming a protective layer or a protective film on the surface of the substrate. In view of the protective action, inorganic materials are preferred or inorganic components are contained in an organic solvent. It is possible that the solute is dispersed.

[0008] The present invention is directed to an embodiment in which each claim light is viewed as a kashiwa, and the configuration and operation will be described together to facilitate understanding of the embodiment. I do.

That is, according to the first aspect of the present invention, a high-energy corona discharge, plasma irradiation,
Irradiation with ultraviolet light or the like is performed to increase the surface energy of the base material to improve the wettability, and a protective layer or a protective film of a preferably inorganic coating material to be the first layer is applied thereon. Further, the surface treatment method is to apply a second layer having water repellency or oil repellency.

According to a second aspect of the present invention, a high-energy corona discharge, plasma irradiation, ultraviolet irradiation, or the like is applied to the surface of the base material to increase the surface energy of the base material to improve the wettability. A first layer, preferably a protective layer or film of an inorganic coating material is applied. In addition, high-energy corona discharge on the surface of the first layer, or
This is a surface treatment method in which the second layer having water repellency or oil repellency is easily adhered by increasing the surface energy by performing plasma irradiation, ultraviolet irradiation, or the like.

Furthermore, the invention according to claim 3 is characterized in that the coated surface layer of the first layer is made of a material containing active hydrogen, and the second layer is easily bonded or adhered to the first layer. This is a surface treatment method for applying a water-repellent or oil-repellent coating material to be a layer.

According to a fourth aspect of the present invention, as the first protective layer or the coating material for the second layer applied on the protective film, a molecule having a chlorsilyl group at at least one end of the molecule and having a linear structure is used. This is a surface treatment method in which a coating solution containing a chlorosilane-based chemical adsorbent containing at least one group selected from a group consisting of a hydrocarbon group, a fluorocarbon group, and a linear siloxane group as a component is formed to form a chemical adsorption film. .

[0013]

(Embodiment 1) An embodiment of the present invention will be described below. FIG. 1 is a simple schematic diagram showing the steps of this embodiment. By irradiating the surface of the substrate 1 to be coated with the high energy rays 3 from the probe 2, a hydroxyl group (—OH group) is introduced into the surface of the substrate 1. For example, when processing a substrate 1 having a width of 40 mm, when the distance between the substrate and the electrode is 10 mm, the substrate is processed at 0.5 kW in the atmosphere for 1 to 5 seconds. In the case where corona discharge treatment is performed as the irradiation of the high energy beam 3, the frequency 2
The irradiation is performed at 0 to 25 kHz and a voltage of 10 to 60 kV for 10 seconds or less. In addition, in the case of irradiating with ultraviolet rays as the irradiation of the high energy rays 3, when using a low-pressure mercury lamp of 1 kW, by irradiating for 30 to 60 seconds,
The surface of the substrate 1 is modified, and many hydroxyl groups are present on the surface. FIG. 2 shows the above state. By irradiating the surface of the substrate 1 with high energy, for example, hydroxyl groups can be increased on the surface (a carboxyl group or the like is generated depending on the substrate). As a first layer 4, an inorganic coating material having a hydroxyl group by performing heating or chemical conversion treatment on the surface of the base material having an increased surface energy as described above, for example, tetramethoxysilane,
Silicon alkoxide compounds such as tetraethoxysilane and tetrapropoxysilane, organopolysiloxane, organoalkoxysilane, colloidal silica, alumina sol, titania sol, zirconia sol, and silicate [Mitsubishi Chemical Corporation: MKC silicate, Tonen Co., Ltd.]
Manufactured: polysilazane etc.]. Here, the thickness of the coating layer of the first layer 4 may be 0.05 μm or more. Light of,
The film thickness may be determined from the heat permeability and the like.

Further, a water-repellent or oil-repellent coating material [a fluorine-based silane compound containing a methoxy group, an ethoxy group or the like alkoxide as a functional group, for example, Shin-Etsu Chemical Co., Ltd.] Co., Ltd .: KBM
7103, KBM7803, KBM801M, manufactured by Dow Corning Toray Silicone Co., Ltd .: AY-43-15
8E or the like, and those containing a chlorosilane group as a functional group, for example, (heptadecafluoro-1,1,2,2-tetrahydrodecyl) trichlorosilane, (tridecafluoro-1,1,2,2-tetrahydrooctyl) ) Trichlorosilane, etc.] to apply a water-repellent or oil-repellent second layer 5 to the surface.

(Example 2) The surface of a substrate is modified by high-energy electric discharge machining, plasma irradiation or light treatment with ultraviolet rays to increase the surface energy and improve the adhesion of the first layer to be applied. The surface of the first layer is similarly modified by high-energy electric discharge machining, plasma treatment or light treatment with ultraviolet light to improve the adhesion of the second layer.

Example 3 A coating material (colloidal silica) having active hydrogen (hydroxyl, carboxyl, thiol, amine, imide, sulfonic acid, etc.) on the surface of the first layer coated on the substrate , A hydrolyzate of alkoxysilane, etc.) so that the second layer is easily bonded or adhered to the first layer.

(Example 4) The surface energy of the substrate (introducing a functional group having active hydrogen) is obtained by heating the surface of the first layer, forming a chemical treatment, or performing high-energy electric discharge machining, plasma irradiation, or light treatment with ultraviolet light. Chlorosilane-based chemisorption containing a chlorosilyl group at at least one end of the molecule and containing at least one group selected from a linear hydrocarbon group, a fluorocarbon group, and a linear siloxane group as a second layer on the enlarged layer. The coating solution containing the agent as one component is coated.

(Embodiment 5) The coatings of Embodiments 1, 2, 3 and 4 are applied to the inner wall of a cooking appliance such as a microwave oven.

The durability test using the above coating will be described below. The performance can be evaluated by measuring the contact angle of water as one index indicating the durability performance. That is, it can be said that the larger the contact angle of water after durability is, the less the deterioration is.

(Heat resistance)
Table 1 shows the results obtained by heating in an electric furnace kept at 00 ° C. for 100 hours and measuring the contact angle.

(Anti-fouling property) A solution in which sugar and soy sauce are mixed at a ratio of 1: 1 is applied to the coated substrate,
It was evaluated whether sticking was removed after heating for 0 minutes, and the one that was taken more times was more excellent in antifouling properties. Table 2 shows the results.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

According to the first aspect of the present invention, the surface of the substrate is subjected to high-energy electric discharge machining, plasma irradiation or light treatment with ultraviolet rays, and then a coating material is applied as a first layer, By applying a water-repellent or oil-repellent coating material as a layer, the bonding or adhesion between the substrate and the first layer, which is a protective film, is improved. Therefore, when the substrate is a metal, oxygen molecules penetrating from the surface of the coating film to the surface of the substrate can be shielded, oxidation of the substrate can be prevented, and the durability of the coating film can be significantly improved. Further, when the substrate is glass, elution of the alkali component from the glass is prevented, and the durability of the coating film is improved.

According to the second aspect of the present invention, the surface of the base material is subjected to high-energy electric discharge machining or plasma irradiation or light treatment with ultraviolet rays, and then a coating material is applied, and the surface is further subjected to high-energy electric discharge machining. Alternatively, a substrate and a first layer are formed by applying a light treatment with plasma irradiation or ultraviolet light, and further applying a water-repellent or oil-repellent coating material on the first layer that has been subjected to electric discharge machining or plasma irradiation or light treatment with ultraviolet light. The bonding or adhesion to the (protective film) and the bonding or adhesion between the first layer and the second layer are improved, and the durability is also improved.

According to the third aspect of the present invention, the second layer is more strongly bonded to the first layer by using a material containing active hydrogen on the surface of the coating material as the first layer.

According to the fourth aspect of the present invention, as the second layer, at least one end of the molecule has a chlorsilyl group, and at least one selected from a linear hydrocarbon group, a fluorocarbon group, and a linear siloxane group. By coating a coating solution containing a chlorosilane-based chemical adsorbent containing one group as a component and forming a chemisorption film, a hydroxyl group that is a functional group containing active hydrogen on the surface of the first layer, a carboxyl group, It causes a dehydrochlorination reaction with a thiol group, an amine group, an imide group, a sulfonic acid group, etc., and binds more firmly, thereby enabling a surface treatment with excellent durability.

According to the fifth aspect of the present invention, since the light is reflected at a high ratio, the cooking performance can be improved and the power consumption during heating can be reduced. Furthermore, since the surface is coated with a water-repellent or oil-repellent coating material, it can be easily cleaned even if it becomes dirty.

[Brief description of the drawings]

FIG. 1 is a schematic view of a surface treatment step in an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a substrate surface in the same step.

[Explanation of symbols]

 Reference Signs List 1 base material 2 probe 3 high energy ray 4 first layer 5 second layer 6 hydroxyl group 7 base material or first layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 7/24 302 B05D 7/24 302L 302Y C09D 5/00 C09D 5/00 C 183/04 183/04 ( 72) Inventor Shuzo Tokuma 1006 Kadoma, Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) EB42 4J038 AA011 DL021 DL031 DL071 GA12 HA216 NA07 PA07 PA17 PB02

Claims (5)

[Claims] 1. A surface treatment in which a surface of a substrate is irradiated with high energy, a coating material constituting a first layer is applied, and a water-repellent or oil-repellent coating material constituting a second layer is further applied. Method. 2. Irradiating the surface of the substrate with high energy, applying a coating material constituting the first layer, and then irradiating the surface of the first layer with further high energy, and then forming the second layer Surface treatment method of applying a water-repellent or oil-repellent coating material. 3. The surface treatment method according to claim 1, wherein the coating material constituting the first layer contains active hydrogen. 4. The coating material constituting the second layer,
A coating solution containing a chlorosilane-based chemical adsorbent containing at least one group selected from a linear hydrocarbon group or a fluorocarbon group or a linear siloxane group having a chlorosilyl group at at least one end of the molecule. The surface treatment method according to claim 1. 5. A cooking appliance or a heating appliance surface-treated using the surface treatment method according to claim 1. Description: