JPH0515840A - Pattern coating method - Google Patents

Abstract

(57) [Summary] [Purpose] The appearance pattern of a patterned coating film is maintained at a constant quality regardless of the shape of the article to be coated. [Structure] A film (2) having a magnet layer (2c) is attached to the surface of an article to be coated (1) composed of a non-magnetic material, and then a base coating material (4) containing a powdery magnetic material (3). ) Is applied to the surface (1a) of the article to be coated (1), and then a clear paint (5) is applied onto the base paint (4) to apply the base paint (4) and the clear paint (5). dry.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a pattern on a coating film by using a magnet to variously orient the powdery magnetic material contained in a base paint.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a pattern such as characters, marks or patterns on the surface of a coating film, an adhesive tape having a predetermined pattern printed thereon is attached to the surface of the coating film, or
There has been known a method of covering a coating film surface with a masking paper in which a predetermined pattern portion is cut off, and further applying a coating material on the masking paper. However, in any of the methods for forming such a pattern, not only is it unfavorable in appearance due to the occurrence of a step due to the adhesive tape or the coating film on the surface of the coating film, but a lot of labor and time are required for the work of attaching the adhesive tape or masking paper. Therefore, there is a cost problem. In addition, dust and the like adhere to the stepped portion of the pattern, which makes cleaning work difficult, and the adhesive tape or the coating film may peel off from the stepped portion.

In order to solve such a problem, a method is proposed in which a powdery magnetic material is mixed in a coating material and a magnet is used to orient the magnetic material to form a desired pattern in a coating film. Has been done. Conventionally, as this kind of technology,
For example, there is one described in JP-A-63-175,670. The method for forming this pattern coating film is to form a liquid coating film containing a powdery magnetic material on the surface of an object to be coated,
A method of forming a pattern by causing a magnet to act on a magnetic material in a desired portion while the coating film is in a fluidized state, wherein the desired pattern size or By applying a magnetic force to the shape of the powder, the orientation of only the magnetic material in the part of the powder magnetic material that has been uniformly dispersed in the coating film affected by the magnetic force is made different from the other parts to form a pattern. To do.

[0004]

By the way, when mass-producing such a pattern coating film, it is necessary to maintain the shape, color, etc. of the pattern formed on the surface of the workpiece at a constant quality. For example, when a magnet is applied from the surface side of the work, it is necessary to keep the distance between the magnet and the work surface constant.However, if this distance cannot be maintained constant, base coating and clear coating are performed and these are dried. If so, there is a problem that the orientation of the magnetic material becomes non-uniform and the pattern of the coating film is not stable. Further, when a magnet is applied from the back side of the work, there is a problem that the magnetic force is not uniform due to the plate thickness of the work and the pattern of the coating film is not stable. The present invention is
The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to maintain a constant quality of an exposed pattern of a patterned coating film regardless of the shape of an object to be coated.

[0005]

Means for Solving the Problems The present invention for achieving the above object comprises the step of adding a powdery magnetic material after attaching a film having a magnet layer to the surface of an article to be coated which is made of a non-magnetic material. Apply the base paint to the surface of the object to be coated, then apply the clear paint on the base paint,
A method for forming a patterned coating film, which comprises drying the base paint and the clear paint.

[0006]

In the present invention thus constituted, a base coating material containing a powdery magnetic material is applied after a film having a magnet layer is attached to the surface of an article to be coated made of a non-magnetic material. By applying to the surface of the object to be coated, a magnetic force acts on the powdery magnetic material in the base coating immediately after the base coating is applied, and the orientation of the magnetic material starts along the lines of magnetic force. At this time, since the magnetic layer acting on the powder magnetic material is fixed on the surface of the work, the magnetic force acting on the powder magnetic material contained in the base paint is constant throughout the base coating, clear coating and these drying processes. Therefore, the contour and color of the patterned coating film can be maintained at a constant quality.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a process diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of a coating film for explaining a magnet layer-containing film attaching process of the same embodiment, and FIG. 3 is a coating for explaining a base coat coating process of the same embodiment. FIG. 4 is a cross-sectional view of the film, FIG. 4 is a cross-sectional view of a coating film for explaining the clear coating process of the same example, and FIG. 5 is a perspective view of a main part showing a magnet layer-containing film of the same example.

The article to be coated 1 according to this example is a base material for forming the pattern coating film of this example and is made of a non-magnetic material. The specific material and shape are not particularly limited, and plastic, aluminum, or the like can be used. Examples of automobile parts include exterior parts such as bumpers, protection moldings, front grilles, rear grills, wheel covers, vent louvers, and interior parts such as instrument panels. These objects to be coated may be subjected to pretreatment, undercoat coating, and intermediate coating as necessary.

The base coating material 4 according to this embodiment is a liquid coating material in which a powdery magnetic material is mixed in a coating material mainly composed of a vehicle component and a solvent, and if necessary, a coloring pigment, a dye or an aluminum powder. , Pearl pigments, mica, etc. can be added. As the vehicle component, a usual coating resin can be used, and examples thereof include a resin that is dried or reaction-cured at room temperature and a resin that is cured or melted by heating. Specifically, alkyd resin, polyester resin, acrylic resin, urethane resin, vinyl resin, amino resin, epoxy resin, phenol resin and the like are preferable.
In addition, examples of the solvent include organic solvents and water. As the form of paint, organic solvent type, non-aqueous dispersion type,
Liquid forms such as an aqueous solution type and an emulsion type can be mentioned.
The powdery magnetic material 3 is a powder whose orientation is changed by magnetic force, and for example, a powder of nickel, stainless steel having a high iron content, iron, or the like is preferable. The shape of the magnetic material may be scale-like, thin plate-like or granular, while the size of the magnetic material is 1 to 50 μm in the longitudinal direction or diameter, preferably 20 to 30 μm. The mixing ratio of the powdery magnetic material is preferably 1 to 30 parts by weight, and particularly preferably 10 to 20 parts by weight with respect to 100 parts by weight (solid content) of the vehicle component described above.

The clear coating material 5 according to this embodiment is a liquid coating material containing a vehicle component and a solvent as main components, and an ordinary coating resin can be used as the vehicle component.
Examples thereof include resins that dry or react and cure at room temperature and resins that cure or melt when heated. In particular,
Alkyd resin, polyester resin, acrylic resin, urethane resin, vinyl resin, amino resin, epoxy resin, phenol resin and the like are preferable, and it is more preferable to use the same resin as the vehicle component of the above-mentioned base paint. In addition, examples of the solvent include organic solvents and water. Examples of the form of the paint include liquid forms such as an organic solvent type, a non-aqueous dispersion type, an aqueous solution type and an emulsion type.

As shown in FIG. 5, the magnet layer-containing film 2 according to this example has a transparent resin film 2a as a base and an adhesive layer 2b on the back surface, while the surface of the resin film 2a is A magnet layer 2c is formed on the. The magnet layer 2c is formed as follows. First,
Weight ratio of resin: ferrite in ink resin = 10: 1
A magnetic ink mixed with ferrite at a ratio of is prepared, and this is printed on the surface of the resin film by screen printing. Then, the ink is dried to magnetize the ferrite. At this time, the printing site of the magnetic ink is determined according to the intended pattern of the coating film. For example, when the character "N" is to be drawn on the surface of the work, the magnetic ink is printed by "N".
It may be screen printed in a letter shape.

Next, the method for forming the patterned coating film of this embodiment will be described. As shown in FIG. 2, if necessary, pretreatment,
The surface 1a of the article 1 to which the undercoating and the intermediate coating are applied
First, the magnet layer-containing film 2 is attached using the adhesive layer 2b.

After the magnet layer-containing film 2 is attached to the surface 1a of the article 1 to be coated, the base coating 4 containing the powdery magnetic material 3 is applied to the surface 1a of the article 1 (that is, the magnet layer-containing film 2). (From above) to a dry film thickness of 15 to 35 μm. At this time, as shown in FIG. 3, the magnetic force generated from the magnet layer 2c acts on the powdery magnetic material 3 in the base coating material 4, and the powdery magnetic material 3 is oriented in the fluid base coating material 4. To start. After applying the base paint 4, the clear paint 5 having a dry film thickness of 1 is formed on the base paint 4 at a predetermined interval (preferably 3 to 5 minutes).
It is applied so as to have a thickness of 5 to 35 μm. This clear paint 5
Magnetic force acts on the powdery magnetic material 3 from the magnet layer 2c even during the application of, and the orientation of the powdery magnetic material 3 continues to proceed as shown in FIG. Usually, the solvent contained in the base paint 4 has a lower boiling point than that of the solvent used for the solid paint or the clear paint due to the compatibility with the clear paint 5 applied wet-on-wet and the restrictions such as equipment conditions such as a coating booth. A quick-drying solvent is used. Therefore, the coating film viscosity of the base coating material 4 increases between the application of the base coating material 4 and the application of the clear coating material 5, whereby the orientation of the powdery magnetic material 3 is temporarily suppressed. In this embodiment, since the magnetic force from the magnet layer 2c acts even while the clear paint 5 is being applied, the solvent contained in the clear paint 5 permeates into the base paint 4 and once the base paint 4 is formed. The coating film viscosity is reduced, and the orientation of the powdery magnetic material 3 is promoted again. After the clear paint 5 is applied, after a certain period of time (for example, 5 minutes), the base paint 4 and the clear paint 5 are dried in a predetermined state with the magnet layer-containing film 2 on the surface of the article 1 being attached. Bake under the conditions.

The orientation action of the powdery magnetic material 3 occurs as follows. That is, as shown in FIG. 4, in the region where the magnetic force is not acting or the action of the magnetic force is relatively weak, the powdery magnetic material is used as in the case where the magnet layer-containing film 2 is coated without being adhered. 3 are randomly arranged in the base paint 4. On the other hand, the magnet layer-containing film 2
The powdery magnetic material 3 is oriented along the lines of magnetic force in the area where the magnetic field acts on the magnetic field. In particular,
Since the magnetic force is strong at the end of the magnet layer 2c, the powdery magnetic material 3 is attracted to the vicinity of this end, and the density of the powder becomes high. On the other hand, in the central portion of the magnet layer 2c, the magnetic lines of force act almost perpendicularly to the coating film, so that the powdery magnetic material 3 stands upright. Therefore, when observing the formed pattern coating film, the powdery magnetic material 3 has a high density along the end portion of the magnet layer 2c, and the color of the magnetic material becomes strong in this portion. Further, since the magnetic material 3 is upright in the central portion of the magnet layer 2c, the reflected light is weakened and the color becomes blackish.

[0015]

As described above, according to the present invention, a base coating material containing a powdery magnetic material is applied after a film having a magnet layer is attached to the surface of an article to be coated made of a non-magnetic material. It is applied to the surface of the object to be coated, and then a clear paint is applied onto this base paint, and since the base paint and the clear paint are configured to dry, a pattern coating film is formed regardless of the shape of the object to be coated. The appearance pattern can be maintained at a constant quality.

[Brief description of drawings]

FIG. 1 is a process drawing showing an embodiment of the present invention.

FIG. 2 is a sectional view of a coating film for explaining a magnet layer-containing film attaching step in the same example.

FIG. 3 is a sectional view of a coating film for explaining a base coat coating process of the same example.

FIG. 4 is a sectional view of a coating film for explaining a clear coating process of the same example.

FIG. 5 is a perspective view of an essential part showing the magnet layer-containing film of the same example.

[Explanation of symbols]

1 ... Coated object, 1a ... Coated object surface,
2 ... Magnet layer-containing film, 3 ... Powder magnetic material, 4 ... Base paint, 5 ... Clear paint, 2c ... Magnet layer.

Claims (1)

Claim: What is claimed is: 1. A base coating material containing a powdery magnetic material is applied to a surface of an article to be coated, the film having a magnet layer on the surface of the article to be coated, which is made of a non-magnetic material. Apply to the surface, then apply clear paint on this base paint,
A method for forming a patterned coating film, which comprises drying the base paint and the clear paint.