JPH09299873A - Patterned coating film formation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently form a patterned coating film in an improved design on an outside sheet of an automotive body. SOLUTION: This method is a method (1) to form a pattern by applying a coloring liquid coating material A to an object surface to be coated in wet state and applying a coloring liquid coating material B having a different color tone from that of the liquid coating material A in spots, and the surface tension of the liquid coating material A is higher than that of the liquid coating material B by 0.3-1dyn/cm. Further, this method includes a method (2) to form a pattern by applying a liquid clear coating material D to the color coated face C on the object to be coated in spots and applying a coloring liquid coating material E with a different color tone from that of the color coated face C, and the surface tension of the liquid clear coating material D is higher than that of the liquid coating material E by 0.3-1dyn/cm.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel method for forming a patterned coating film.

[0002]

2. Description of the Related Art As a method for improving the designability by finishing the outer plate portion of an automobile body with a plurality of different colors, there are two-tone painting finish and attachment of colored tape.

However, for a two-tone paint finish,
Most of the upper and lower parts of the side surface of the outer panel are painted in two colors, which has the drawback of being monotonous and poor in design. Further, the sticking of the colored tape has a drawback that the sticking work is complicated, and that the tape portion is projected and dust or the like is attached to the adhesive layer portion at the end thereof to deteriorate the appearance.

[0004]

The object of the present invention is to solve the drawbacks of the prior art described above, and to provide a novel pattern coating capable of suitably forming a pattern coating film having an improved design property on the outer panel of an automobile body. It is to provide a film forming method.

[0005]

Means for Solving the Problems As a result of intensive studies aimed at eliminating the above-mentioned drawbacks of the prior art, the present inventor has adjusted the surface tension of a colored liquid paint forming a spotted pattern to a specific range. The inventors have found that the object can be achieved and have completed the present invention.

That is, according to the present invention, (1) a colored liquid coating material (A) is applied to an object to be coated, and a colored liquid coating material (B) having a color tone different from that of the liquid coating material (A) is applied to the wet coating surface. ) Is applied in spots to form a pattern, the liquid coating (A)
Has a surface tension of 0.3 to 1 dyn / cm higher than that of the liquid coating material (B) (hereinafter referred to as the present invention method 1), and (2) coloring on an object to be coated. The liquid clear coating material (D) is applied to the coated surface (C), and the colored liquid coating material (E) having a color tone different from that of the colored coated surface (C) is applied in spots on the coated surface in a wet state. Which is characterized in that the surface tension of the liquid clear coating material (D) is 0.3 to 1 dyn / cm higher than that of the liquid coating material (E). Method 2)).

The method of the present invention is preferably applied to the outer skin of an automobile, but is not limited thereto.

The object to be coated in the method of the present invention is not particularly limited, but the outer panel of an automobile or the like is previously undercoated with a cationic electrodeposition coating, or the undercoat and intermediate coating are applied, and each coating is heated. Those that have been cured are preferred.

In the method 1 of the present invention, a colored liquid coating material (A) is applied to an object to be coated, and a colored liquid coating material (B) having a color tone different from that of the liquid coating material (A) is spotted on the wet coating surface. A method for forming a pattern by applying the liquid paint (A)
Has a surface tension of 0.3 to 1 dyn / cm higher than that of the liquid coating material (B).

The colored liquid paint (A) contains a vehicle component, a coloring pigment and a solvent as main components, and includes solid color paints and metallic paints.

The vehicle component comprises a base resin and a crosslinking agent. Examples of the base resin include an acrylic resin having a crosslinkable functional group such as a hydroxyl group, a carboxyl group, an epoxy group, a urethane resin, a polyester resin, an alkyd resin and the like. Examples of the crosslinking agent include a blocked polyisocyanate, a melamine resin, and a carboxyl group-containing compound that can react with these functional groups.

The color pigments include both solid color pigments and metallic pigments, and those generally used in the paint field can be used. As the solid color pigment, zinc white, titanium white, carbon black, molybdenum red, red iron oxide, permanent red, perylene vermillion, chrome yellow, monoazo pigment, chrome vermillion, cyanine green, cyanine blue, quinacridone red and the like are preferable, As the metallic pigment, aluminum, mica, mica surface-coated with titanium dioxide, mica surface-coated with iron oxide, mica-like iron oxide, mica-like iron oxide surface-coated with titanium dioxide and the like are preferable.

As the solvent, an organic solvent and water can be used, and as the organic solvent, a general organic solvent for paints such as hydrocarbon type, ester type, ketone type and ether type can be used.

The colored liquid coating material (A) is obtained by mixing these vehicle components and color pigments in a solvent (organic solvent and / or water) to dissolve or disperse them. The color tone can be arbitrarily selected according to the purpose.

The surface tension of the coating material (A) during coating is 30 to
The surface tension is preferably 33 dyn / cm, and can be adjusted by the composition of the vehicle component or the solvent, but can also be adjusted by adding a surfactant, a silicon-containing compound, a fluorine-containing compound or the like.

In the method 1 of the present invention, the colored liquid coating material (A) is applied to the entire surface or a part of the object to be coated by an electrostatic method, a spray method or the like. The film thickness is preferably 25 to 45 μm based on the cured coating film.

Then, while the coating film of the coating material (A) is in a wet state, the colored liquid coating material (B) is applied in spots on the coated surface. Here, the "wet state" means that when the coating film is scratched with a pencil lead so as to reach the substrate, the coating surface is leveled rapidly (usually in the range of about 1 to 180 seconds). It is a wet coating that returns to its original state. Also,
“Spotted” includes spots, polka dots, irregular filaments, and the like.

The colored liquid paint (B) is a paint containing a vehicle component, a color pigment and a solvent as main components, and includes both solid color paints and metallic paints. As the vehicle component, the color pigment and the solvent, it is preferable to use one selected from the above description of the coating material (A).

It is necessary to make the color tone of the colored liquid coating material (B) different from that of the coating material (A) which has already been applied, and the range of the difference may be at least as large as visually recognizable. The color combination can be arbitrarily selected depending on the purpose. Also, paint (A) and paint (B)
For example, both may be solid color or metallic, or one may be solid color and the other may be metallic.

As a method for applying the colored liquid coating material (B) to the wet coating surface of the coating material (A) in spots, for example, an electrostatic method, a spray method or the like is suitable. Specifically, the coating film of the coating material (B) does not cover the entire coating surface of the coating material (A) as a continuous coating film,
Unevenly so that the coated surface of the paint (A) is partially exposed,
For example, it is preferable to adjust the discharge amount so that the applied coating film has spots, polka dots, and irregular filaments. Here, the film thickness of the paint (B) is not limited as long as a pattern is formed.

It is necessary to adjust the surface tension of the colored liquid coating material (B) at the time of coating so as to be smaller than that of the coating material (A) by 0.3 to 1 dyn / cm. If the surface tension difference between the two coating materials is out of this range, the pattern of the coating material (B) becomes unclear or protrudes, which is not preferable. By adjusting the surface tension difference between both paints within the above range, the speckled pattern of the paint (B) is clear without breaking and is united with the wet coating film of the paint (A), and the speckled part is projected. It is possible to finish a smooth pattern coating without denting.

In this way, after the colored liquid coating material (B) having a different color tone is applied in spots on the wet coating surface of the colored liquid coating material (A), the coating liquid is heated to simultaneously cure both coating films. The method for forming a patterned coating film according to Inventive Method 1 is achieved. The heat curing condition is a temperature of 120 to 160 ° C.
0 to 60 minutes is preferable.

In the method 1 of the present invention, after the colored liquid coating material (A) and the colored liquid coating material (B) have been applied, they may be cured by heating or may not be cured by heating. May be.

In the method 2 of the present invention, the liquid clear coating material (D) is applied to the colored coating surface (C) on the object to be coated, and the color tone of the liquid coating material in the wet state is the same as that of the colored coating surface (C). A method for forming a pattern by applying different colored liquid paints (E) in spots, wherein the surface tension of the liquid clear paints (D) is 0.3 to 1 dyn / cm higher than that of the liquid paints (E). Is a method for forming a patterned coating film.

The colored coating surface (C) on the object to be coated is formed, for example, by applying a solid color paint and a metallic paint whose main components are a vehicle component, a coloring pigment and a solvent. As the vehicle component, the color pigment and the solvent, those selected from the description of the colored liquid coating material (A) can be used. The color tone can be arbitrarily selected according to the purpose and may be either a solid color coating film or a metallic coating film. The surface tension of the paint used for forming the colored coated surface (C) is not limited.

In the method 2 of the present invention, the liquid clear coating material (D) is applied to the entire surface of the colored coating surface (C) with or without curing.

The clear coating (D) is a colored coating surface (C).
Is a paint that forms a transparent coating film to such an extent that the color tone can be seen through, and is obtained by removing all or almost all of the coloring pigment from the constituent components of the colored liquid paint (A), and having a surface tension of 30 to 33 dyn at the time of painting. It is preferably included within the range of / cm.

While the clear paint (D) is applied by a spray method, an electrostatic method or the like in a wet state, a colored liquid paint (E) having a color tone different from that of the colored paint surface (C) is spotted on the paint surface. Apply to form a pattern. Here, “speckled” and “wet state” are as described in the method 1 of the present invention. The speckled coating can be performed by the method described above.

As the colored liquid paint (E), it is preferable to use one selected from the colored liquid paints (B) described in the above-mentioned Method 1 of the present invention.

That is, the colored liquid coating material (E) is a solid color coating material or a metallic coating material containing a vehicle component, a color pigment and a solvent as main components. As the vehicle component, the color pigment and the solvent, it is preferable to use one selected from the above description of the coating material (A). It is necessary to make the color tone of the paint (E) different from that of the colored coating surface (C) that has already been applied, and the range of difference should be at least visually recognizable. The combination can be arbitrarily selected depending on the purpose. The combination of the paint (C) and the paint (E) may be either solid color or metallic, or one may be solid color and the other may be metallic.

Colored liquid paint (E) is applied to clear paint (D)
As a method for coating the wet coated surface in spots, for example, an electrostatic method, a spray method, or the like is suitable. Specifically, the coating film of the colored liquid coating material (E) does not cover the entire coating surface of the coating material (C) as a continuous coating film, and the coating surface of the coating material (C) is unevenly exposed so as to be partially exposed. For example, it is preferable to adjust the discharge amount so that the applied coating has spots, polka dots, and irregular filaments.

It is necessary to adjust the surface tension of the colored liquid coating material (E) at the time of coating so that it becomes smaller by 0.3 to 1 dyn / cm than the clear coating material (D). If the surface tension difference between the two coating materials is out of this range, the pattern of the coating material (E) becomes unclear or protrudes, which is not preferable. By adjusting the surface tension difference between both paints within the above range, the speckled pattern of the paint (E) is clear without being broken, and is united with the wet coating film of the paint (D), and the speckled part is projected. It is possible to finish a smooth pattern coating without denting.

A method for forming a patterned coating film according to the method 2 of the present invention by applying the colored liquid coating material (E) in spots on the wet coating surface of the clear coating material (D) and simultaneously heating both coating films to cure them. Is achieved. The heat curing condition is a temperature of 12
It is preferably 0 to 160 ° C. and 10 to 60 minutes.

Further, after the colored liquid coating material (E) is applied, it may be cured by heating, or may be further cured by coating with a clear coating material without being cured by heating.

[0035]

The present invention will be described more specifically below with reference to examples and comparative examples.

Example 1 (Invention Method 1) A colored liquid coating material (A) ("Amilac TM13") was applied to the exterior surface of an automobile which had been subjected to cationic electrodeposition coating and intermediate coating, followed by heat curing.
Kansai Paint Co., Ltd., product name, polyester resin / melamine resin type white solid color thermosetting organic solvent type paint, surface tension at the time of coating 30 dyn / cm) was applied so that the thickness of the cured coating film would be 30 μm. . Then, the colored liquid paint (B) (“Amilak TM1” is applied to the wet coated surface.
3 ”Kansai Paint Co., Ltd. product name, polyester resin / melamine resin red solid color solid color thermosetting organic solvent type paint with a surface tension of 29.5 dyn / cm) was applied in spots using a manual sprayer, allowed to stand at room temperature for 7 minutes, then heated at 140 ° C. for 30 minutes to cure both coatings.

As a result, the spotted pattern of the colored liquid coating material (B) is clear without being broken, and is united with the coating film of the colored liquid coating material (A) to finish smoothly without the spotted portions protruding or denting. I was able to.

(* 1) The coating surface modifier is "Shin-Etsu Silicone KP-327" (trade name, phenylmethylpolysiloxane, manufactured by Shin-Etsu Chemical Co., Ltd.).

Comparative Example 1 A surface tension during coating was 28.5 dy by further adding a coating surface modifier (* 1) to the colored liquid coating material (B) used in Example 1.
Colored liquid paint (B ') made n / cm colored liquid paint (B)
The procedure of Example 1 was repeated except that As a result, the spot-like portion was projected or recessed, and the smoothness was not sufficient.

Example 2 (Invention Method 2) A colored paint (“Magiclon TB300”, manufactured by Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin type) was applied to the exterior skin of an automobile which had been subjected to cationic electrodeposition coating and intermediate coating. Light blue solid color thermosetting organic solvent type paint) is applied so that the film thickness of the cured coating film is 30 μm to form a colored coating film (C), and the liquid clear is applied to the entire coated surface without curing. Paint (D) (“Magicalon TC32F” manufactured by Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin-based clear thermosetting organic solvent-based paint, surface tension at coating 30
dyn / cm) was applied so that the thickness of the cured coating film would be 40 μm. Then, the wet coated surface is coated with a colored liquid coating (E) (“Amilak TM13” manufactured by Kansai Paint Co., Ltd., a trade name, polyester resin / melamine resin red solid color thermosetting organic solvent type coating Regulator (*
1) was added to adjust the surface tension at the time of coating to 29.5 dyn / cm), and spot-like coating was performed with a manual spray using, and the mixture was left at room temperature for 3 minutes and then heated at 140 ° C for 30 minutes. The coating was cured.

As a result, the speckled pattern of the colored liquid coating material (E) is clear without being broken, and it is united with the clear coating material (D) coating, so that the speckled portion is finished smoothly without protruding or denting. I was able to.

Comparative Example 2 The colored liquid coating material (E) used in Example 2 was further added with a coating surface adjusting agent (* 1) so that the surface tension during coating was 28.5 dy.
The same procedure as in Example 2 was carried out except that the colored paint (E ') adjusted to n / cm was replaced with the colored paint (E). As a result, the spot-like portion was projected or recessed, and the smoothness was not sufficient.

Example 3 (Invention Method 1) A colored liquid coating material (A) (“Magicalon TA15” was applied to the exterior skin of an automobile which had been subjected to cationic electrodeposition coating and intermediate coating, followed by heat curing.
U ”Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin-based silver metallic thermosetting organic solvent type paint,
The surface tension at the time of coating is 30.5 dyn / cm.
It was painted so as to have a thickness of 0 μm. On the wet coated surface, a colored liquid coating (B) (“Amilak TM13” manufactured by Kansai Paint Co., Ltd., trade name, polyester resin / melamine resin-based blue solid color thermosetting organic solvent type coating, coating surface adjustment agent ( * 1) is added and the surface tension during painting is 29.8 dyn / cm.
Was applied in spots using a hand spray, left at room temperature for 3 minutes, and then heated at 140 ° C. for 60 minutes to cure both coatings.

As a result, the spotted pattern of the colored liquid coating material (B) is clear without being broken, and is united with the metallic liquid coating material (A) coating film, and the spotted portion is finished smoothly without protrusion or depression. I was able to.

Example 4 (Invention Method 2) A colored coating (“Magiclon TB300”, manufactured by Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin type) was applied to the outer skin of an automobile which had been subjected to cationic electrodeposition coating and intermediate coating and heat curing. Silver metallic thermosetting organic solvent type paint) was applied so that the thickness of the cured coating film would be 15 μm. Then, a liquid clear coating (D) ("Magiclon TC32F" manufactured by Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin-based clear thermosetting organic solvent type coating, surface tension at coating 30 dyn / cm) cured film thickness is 4
Colored liquid paint (E) ("Amilak TM13" manufactured by Kansai Paint Co., Ltd., trade name, polyester resin / melamine resin-based blue color thermosetting organic solvent type paint applied to 0 μm Then, a paint surface modifier (* 1) was added to adjust the surface tension at the time of coating to 29.6 dyn / cm) and applied in spots with a hand spray, and left at room temperature for 3 minutes, then at 140 ° C. Both coatings were cured by heating for 30 minutes.

As a result, the speckled pattern of the colored liquid coating material (E) is clear without being broken, and is united with the clear coating material (D) coating film, so that the speckled portion is finished smoothly without protrusion or depression. I was able to.

[0047]

EFFECTS OF THE INVENTION It is possible to easily form a speckled pattern on the outer surface of an automobile body and improve the design.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Mizutani, Aichi Prefecture, Miyoshi-machi, Nishikamo-gun, Daiyozai-zai, 1st land, Kansai Paint Co., Ltd. Address Kansai Paint Co., Ltd.

Claims (2)

[Claims] 1. A colored liquid paint (A) is applied to an object to be coated,
A method for forming a pattern by applying a colored liquid coating material (B) having a color tone different from that of the liquid coating material (A) to the coated surface in a wet state to form a pattern, wherein the surface tension of the liquid coating material (A) is A method for forming a patterned coating film, which is larger than the liquid coating material (B) by 0.3 to 1 dyn / cm. 2. A colored liquid coating composition in which a liquid clear coating composition (D) is applied to a colored coating surface (C) on an object to be coated, and the wet coating surface has a color tone different from that of the colored coating surface (C). (E) is a method of applying a spot-like pattern to form a pattern, wherein the liquid clear coating (D) has a surface tension of 0.3 to 10 as compared with the liquid coating (E).
A method for forming a patterned coating film, which is large by 1 dyn / cm.