JP2888033B2 - Method of forming patterned coating film - Google Patents

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 variously orienting a powdery magnetic material contained in a base coating material using a magnet.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a pattern such as a character, a mark or a pattern on a coating film surface, an adhesive tape having a predetermined pattern printed thereon is attached to the coating film surface,
There has been known a method of covering a coating film surface with a masking paper from which a predetermined pattern portion has been cut, and further applying a coating material thereon. However, in any of the methods for forming such a pattern, a step due to the adhesive tape or the coating film occurs on the coating film surface, which is not only unfavorable in appearance, but also requires a great deal of labor and time for attaching the adhesive tape or masking paper. Therefore, there is a problem in cost. In addition, dust and the like adhere to the step portions of the pattern, making cleaning difficult, and the adhesive tape or the coating film may peel off from the step portions.

In order to solve such a problem, there has been proposed a method of mixing a powdery magnetic material into a paint and orienting the magnetic material using a magnet, thereby forming a desired pattern in a coating film. Have been. Conventionally, this type of technology has
For example, there is one described in JP-A-63-175670. This pattern coating film forming method is to form a liquid coating film containing a powdery magnetic material on the surface of an object to be coated or the like,
A method of forming a pattern by applying a magnet to a magnetic material of a target portion while the coating film is in a fluid state, wherein the size of the target pattern and By applying a magnetic force to the shape with a magnet, the pattern is formed by changing the orientation of only the magnetic material in the portion of the powdered magnetic material that has been affected by the magnetic force among the powdered magnetic material that is uniformly dispersed throughout the coating film with the other parts Is what you do.

[0004]

However, 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 work at a constant quality. According to the search conducted by the present inventors, it was found that the appearance and color of the contour of the pattern coating film greatly changed depending on the timing of applying the magnet. For example, even if the magnet was acted on while the liquid coating containing the powdered magnetic material was in a fluid state described in the above publication, the magnet was attached before the paint was applied. The degree of orientation of the magnetic material was different from that performed after the application, resulting in a difference in the color of the pattern. Also, regarding the timing of removing the magnet, the color of the pattern greatly varied depending on the time from application of the paint to removal. Generally, a quick-drying solvent is used as the base paint in the two-coat, one-bake type coating in view of compatibility with the clear coating and coating equipment, and the above-mentioned coating film has a short fluidity. The problems that have appeared are prominent. So far, with the magnet placed on the back side of the object to be coated, first apply the base paint and apply the clear paint, then remove the magnet and dry these base paint and the clear paint. Technology has been developed.

[0005] However, in such a forming method, as shown in FIG. 8, the base paint 4 and the clear paint 5 are arranged with the magnet 2 disposed on the back surface 1 b of the work 1.
Is applied, when the powdered magnetic material 3 is oriented, the portion of the powdered magnetic material 3 having the strongest magnetic force, such as the end of the magnet 2, stands almost vertically, or the magnetic force acts. The magnetic material 3 sometimes protrudes from the layer of the clear paint 5 due to connection of the magnetic material in the vertical direction. When such a phenomenon occurs, it is necessary to sharpen, polish, or apply an overcoat clear paint to the protruding magnetic material 3 in order to deteriorate the quality of the coating film on the surface of the product, and the process becomes complicated. there were.

[0006] The present invention has been made in view of such problems of the prior art, and it is an object of the present invention to prevent a magnetic powder material from protruding from a clear paint layer.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for coating a liquid paint containing a powdered magnetic material.
Applied to the surface of the product and the liquid paint is in a fluid state.
In addition, a magnet is arranged on the back surface of the object to be coated of a target portion,
Pattern coating for changing the orientation of the powdery magnetic material
In the method of forming a film, first, a magnet is arranged on the back surface of the object to be coated , and then a liquid base paint mixed with a powdered magnetic material is applied to the surface of the object to be coated, and the liquid
Remove the magnet after a time to the extent that fluidity of the base paint not lost has elapsed from the back of the object to be coated, further
, The state in which the magnet is removed under the clear paint was applied onto the base coating, and finally, the decorative paint film, characterized in that as drying the base coating and clear coating It is a forming method.

[0008]

According to the present invention, a base paint containing a powdery magnetic material is applied to the surface of the object to be coated after a magnet is attached to the back surface of the object to be coated made of a nonmagnetic material. The magnetic force acts on the powdered magnetic material in the base paint immediately after the base paint is applied, and the magnetic material starts to be oriented along the lines of magnetic force. The coating viscosity of the base paint will dry relatively quickly due to evaporation of the solvent, and the orientation of the magnetic powder in the base paint will not reach the limit. In this state, by canceling the action of the magnetic force and applying the clear paint, it is possible to prevent the magnetic powder from projecting from the clear paint layer.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a process diagram showing one embodiment of the present invention, FIG. 2 is a sectional view showing a work in a first process of the embodiment, and FIG.
Is a sectional view showing a work and a coating film in a second step of the embodiment, FIG. 4 is a sectional view showing a work and a coating film in a third step of the embodiment, and FIG. It is sectional drawing which shows a workpiece | work and a coating film in five processes.

The article to be coated 1 according to the present embodiment is a base material for forming the pattern coating film of the present embodiment 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 automotive parts include exterior parts such as bumpers, protection malls, front grilles, rear grilles, wheel covers, vent louvers, and interior parts such as instrument panels. These objects to be coated may be subjected to pretreatment, undercoating, or intermediate coating as needed.

The base coating material 4 according to the present embodiment is a liquid coating material in which a powdered magnetic material is mixed in a coating material containing a vehicle component and a solvent as main components. Pearl pigment, mica and the like. As the vehicle component, an ordinary resin for a coating material can be used, and examples include a resin which is dried or reacted and cured at room temperature, and a resin which 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.
Examples of the solvent include an organic solvent and water. As the form of the paint, organic solvent type, non-aqueous dispersion type,
A liquid such as an aqueous solution type or an emulsion type is exemplified. The powdery magnetic material 3 is a powder whose orientation is changed by a magnetic force, for example, stainless steel having a high nickel and iron content,
Powders such as iron are preferred. The shape of the magnetic material is scaly,
The shape of the magnetic material may be any of a thin plate shape and a granular shape. The mixing ratio of the powdered magnetic material is preferably 1 to 30 parts by weight, particularly preferably 10 to 20 parts by weight, based on 100 parts by weight (solid content) of the above-mentioned vehicle component.

The clear coating material 5 according to the present embodiment is a liquid coating material containing a vehicle component and a solvent as main components, and a powdery magnetic material may be mixed therein. As the vehicle component, an ordinary resin for coating can be used, and examples thereof include a resin that is dried or reacted and cured at room temperature, and a resin that is cured or melted by heating. Specifically, an alkyd resin, a polyester resin, an acrylic resin, a urethane resin, a vinyl resin, an amino resin, an epoxy resin, a phenol resin, and the like are preferable, and it is more preferable to use the same resin as the vehicle component of the base paint described above. Examples of the solvent include an organic solvent and water. Examples of the form of the paint include liquids such as an organic solvent type, a non-aqueous dispersion type, an aqueous solution type and an emulsion type.

Next, a method of forming a patterned coating film according to this embodiment will be described. As shown in FIG. 2, pre-processing as necessary,
The back surface 1b of the work 1 to which undercoating, intermediate coating, etc. has been applied
First, the magnet 2 is attached. The magnet 2 is a flexible permanent magnet, and it is preferable to use, for example, magnet rubber. In particular, when the shape of the article to be coated 1 is complicated, it can be formed in a predetermined shape in advance. The shape of the magnet 2 is variously formed according to the outline of the target pattern. For example, when it is desired to draw the letter "N" on the coating film, a thin plate-shaped magnet 2 as shown in FIG. 6 may be used. After the magnet 2 is attached to the back surface 1b of the article 1, the base paint 4 containing the powdered magnetic material 3 is applied to the surface 1a (that is, the applied face) of the article 1 in a dry film thickness of 15 to
It is applied so as to have a thickness of 35 μm. At this time, as shown in FIG. 3, the magnetic force generated from the magnet 2 acts on the powdered magnetic material 3 in the base coating material 4, and the powdered magnetic material 3 is oriented in the base coating material 4 having fluidity. Start. When a predetermined time of, for example, about 3 to 5 minutes has elapsed since the application of the base paint 4, the magnet 2 is removed from the workpiece 1 as shown in FIG. Since the viscosity of the coating of the base coating material 4 rises relatively quickly during the above-mentioned predetermined time, the fluidity of the base coating material 4 is lost before the orientation of the magnetic powder 3 reaches the ultimate state, and Stops.

Next, a clear paint 5 is applied on the base paint 4 so as to have a dry film thickness of 15 to 35 μm. FIG. 5 shows a state where the clear paint 5 is applied. Since the clear paint 5 is applied to the base paint 4 in a state where the orientation of the magnetic powder 3 is stopped, the magnetic powder 3 is prevented from protruding from the coating surface of the clear paint 5, A high quality coating with a smooth surface is achieved. Usually, as a material for the clear paint 5, the solvent contained in the base paint 4 is used as a solid paint or a clear paint due to compatibility with the clear paint 5 to be applied wet-on-wet and restrictions on equipment conditions such as a painting booth. A solvent having a lower boiling point and a faster drying property than the solvent used is used. As shown in FIG. 5, when the clear paint 5 is applied, the base paint 4 and the clear paint 5 are baked under predetermined drying conditions.

The orientation of the powdered magnetic material 3 in the base paint 4 occurs as follows. That is, as shown in FIG. 3, in a portion where no magnetic force is applied or where the action of the magnetic force is relatively weak, the powdered magnetic material 3 is coated with the base paint in the same manner as when the coating is performed without the magnet 2 attached. 4 randomly arranged. On the other hand, the powder magnetic material 3 is oriented along the line of magnetic force at the part where the magnet 2 is attached and the magnetic force is acting. In particular, since the end portion 2a of the magnet 2 has a strong magnetic force, the powder magnetic material 3 is attracted to the vicinity of the end portion 2a, and the density of the powder increases. On the other hand, in the central portion 2b of the magnet 2, the magnetic flux acts substantially perpendicularly to the coating film, so that the powder magnetic material 3 stands upright. Therefore, when observing the formed pattern coating film, the density of the powdery magnetic material 3 becomes high along the end 2a of the magnet 2, and the color of the magnetic material becomes strong in this portion. Further, since the magnetic material 3 stands upright, the central portion 2b of the magnet 2 becomes weak in reflected light and has a dark color.
To describe the pattern formed by using the magnet 2 as shown in FIG. 6, as shown in FIG. The central portion 8 of the character "" looks darker than the surrounding color. Also, due to such color contrast, the peripheral portion 6 of the character “N” is observed as if a wall is formed, whereby the entire character “N” appears to stand out three-dimensionally. Moreover, since the method of forming a patterned coating film of the present embodiment is configured to keep the change of the coating film viscosity of the base coating material 4 and the time of action of the magnetic force constant, the solvent of the base coating material 4 may be changed due to seasonal variation. Even if the type or coating conditions change, the orientation effect of the powder magnetic material 3 can be maintained in a constant state, and the contour and color of the pattern coating film can be maintained in a constant quality.

[0016]

According to the present invention as described above, according to the present invention, arranged magnets on the back surface of the article to be coated made of a nonmagnetic material, the following
Then, a liquid base paint mixed with a powdered magnetic material is applied to the surface of the object to be coated, and the liquid base paint
After a lapse of time such that the fluidity does not disappear , the magnet is removed from the back surface of the object to be coated, and in a state where the magnet is removed, a clear paint is applied on the base paint. Finally, since the base paint and the clear paint are dried, the clear paint is applied on the base paint in a state where the orientation of the magnetic powder in the base paint does not reach an extreme state, and the coating surface Is smoothed and a high quality coating is obtained. Also, base paint
To keep the change of the coating and the action time of the magnetic force constant
Therefore, the type of solvent in the base paint and the
Even if the coating conditions change, the orientation of the powdery magnetic material
It can be maintained in a fixed state, and the contour and color of the pattern paint etc.
Quality can be kept constant.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of the present invention.

FIG. 2 is a sectional view showing a work in a first step of the embodiment.

FIG. 3 is a sectional view showing a work and a coating film in a second step of the embodiment.

FIG. 4 is a sectional view showing a work and a coating film in a third step of the embodiment.

FIG. 5 is a sectional view showing a workpiece and a coating film in a fourth step and a fifth step of the embodiment.

FIG. 6 is a front view showing the magnet according to the embodiment.

FIG. 7 is a front view showing a coating film formed using the magnet shown in FIG.

FIG. 8 is a cross-sectional view showing the orientation state of a magnetic powder when a base paint and a clear paint are applied in a state where a magnet is arranged as a comparative example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coated object, 1a ... Surface (coated surface) of a coated object, 1b ... Back surface of a coated object, 2 ... Magnet, 3 ... Powder magnetic material, 4 ... Base paint, 5 ... Clear paint.

Claims (1)

(57) [Claims] 1. A liquid paint mixed with a powdery magnetic material is coated.
Apply to the surface of the paint, and make sure that the liquid paint is in a fluid state.
In addition, a magnet is arranged on the rear surface of the object to be coated in a target portion.
Then, the orientation of the powder magnetic material is changed.
In the method for forming a coating film, first, a magnet is arranged on the back surface of the object to be coated , and then a liquid base paint mixed with a powdered magnetic material is applied to the surface of the object to be coated, and Fluidity of liquid base paint
After a period of time that does not disappear , the magnet is removed from the back surface of the object to be coated, and further, under the state where the magnet is removed, a clear paint is applied on the base paint, and finally, method of forming a decorative paint film, characterized in that as drying the base coating and clear coating.