JPH09225381A - Method for two-color coating finish having color tone change - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the width of the hue of finish color and to improve design effect. SOLUTION: In a method for two-color coating finish, graduation is formed in a color tone by supplying a coating material the color tone of which changes continuously to a coater in the first color coating, the coating film is baked to form a cured film of the first color having graduation in a color tone. Next, a prescribed place of the cured film of the first color is masked, and the unmasked place is coated with the second color which makes a coating color different from that of the first color film, and the film is baked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-color coating finishing method used for coating automobiles and the like.

[0002]

2. Description of the Related Art The conventional two-color paint finishing method is basically composed of two uniform colors, and the effect of design is obtained by locally coloring these two colors. Was there. However, due to the recent diversification of consumer sensation, passenger cars, especially cars with wide vertical parts such as RV cars and one-box cars, are designed to satisfy consumers when they are painted by the above-mentioned conventional two-color paint finishing method. No effect,
The development of a further two-color paint finishing method has been earnestly desired.

Therefore, in reality, a colored tape, a printed sticker or the like is applied to give a design accent, but the step of the sticking part impairs the design, and the gloss and luster are provided. It was also inferior to the paint finishing method in terms of texture and the like.

[0004]

The present invention has been made in view of the above problems.

The present inventors diligently studied a two-color coating finishing method that solves the above problems. As a result, they have found that the above problems can be solved by changing the colors themselves in a two-color coating finishing method, and have completed the present invention.

That is, according to the present invention, in the 1.2-color coating finishing method, in the first color coating, the coating machine is supplied with the coating material whose color tone is continuously changed to form the gradation in the color tone, and the baking is performed. A cured coating film of the first color having a gradation in color is formed by drying, and then a predetermined portion of the cured coating film of the first color is masked to form a coating film of the first color on the unmasked portion. A two-color coating finishing method having a color tone change characterized by performing a second color coating forming a different coating color and baking and drying (hereinafter, referred to as
The "first method of the present invention" may be abbreviated).

In the 2.2-color coating finishing method of the present invention, in the first color coating, a base paint whose color tone changes continuously in the first color coating is applied to form a gradation in the color tone and to print it. A base cured coating film of the first color having a gradation in the color tone is formed by drying, and then a predetermined portion of the base cured coating film of the first color is masked, so that the base portion of the first color is not masked. A base paint of the second color that forms a different color from the paint film is applied, then the masking is removed and a clear paint is applied on the base hardened paint film of the first color and the uncured base paint of the second color and baked. A two-color coating finishing method having a color tone change characterized by being dried (hereinafter, may be abbreviated as “second invention method”).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the method of the present invention, an object to be coated such as a car body is usually obtained by processing a metal plate such as iron, galvanized steel plate or aluminum plate, and subjecting it to phosphate treatment or chromate treatment. It has been pretreated. The undercoat coating is applied to the object to be coated by a method such as electrodeposition coating. After the undercoat coating, baking and drying are generally performed, but in some cases, the baking and drying after the primer coating can be omitted.

After the base coat is applied, an intermediate paint is usually applied. Baking drying is generally performed after the intermediate coating is applied, but in some cases, baking drying after the intermediate coating can be omitted. The intermediate coating material is not particularly limited, and various types can be used. Typical examples of the base resin include polyester resin type, alkyd resin type, acrylic resin type, epoxy resin type, urethane resin type. Examples of the curing agent include a melamine resin, an isocyanate compound, and a polybasic acid compound. In some cases, the intermediate coating itself may be omitted.

A specific example of the first method of the present invention is, for example, topcoat enamel coating.

Specific examples of the second method of the present invention include, for example, topcoat base coating-clear coating. The base coating-clear coating includes a step of pigment-colored base-aluminum powder, base powder containing bright pigment such as titanium oxide-coated mica powder-clear coating.

The resin system of the overcoat paint is not particularly limited in any of the overcoat enamel, the overcoat base and the overcoat clear, and various types can be used.
Representative examples include polyester resin-based, alkyd resin-based, acrylic resin-based, epoxy resin-based, urethane resin-based, etc., and these resin systems include melamine resins, isocyanate compounds, polybasic acid compounds, etc. as crosslinking agents. can do.

In the method of the present invention, it is preferable that the respective top-coat paints do not squeeze out as much as possible at the boundary portion at the time of top-coating. Examples of this method include a method using an air curtain.

In the method of the present invention, a cured coating film of the first color having gradation in the color tone is formed by baking and drying, and then predetermined portions of the coating film of the first color are masked,
A second color coating is applied to the unmasked portion to form a coating color different from the first color coating film. The cured coating film of the first color, which is the unmasked portion, may be removed by sanding or the like, if necessary, before the coating of the second color.

As an apparatus for supplying a paint whose color tone is continuously changed, which is used in the method of the present invention, for example, there are a plurality of primary color paints having different paint colors as described in JP-B-5-23824. In addition to connecting a plurality of branch paths for branching by adjusting the flow rate of the primary color paint from each circulation and mixers connected to these branch paths in parallel, a relay tank for each mixer. The circulation circuit of the toning paint is connected via the combination of the branch circuits branching from each of the circulation circuits, the color change valves connected to the branch circuits, and the coating machine communicating with the branch circuits connected to these circulation circuits. A paint supply device (hereinafter, this device may be abbreviated as “two-liquid mixed paint supply device”) characterized by branching one or more bodies

The coating machine used in the method of the present invention is not particularly limited, and an air spray coating machine, an airless spray coating machine, an air spray type electrostatic coating machine, an airless spray type electrostatic coating machine, a rotary atomizing type electrostatic coating machine. Any ordinary coating machine such as a machine can be used.

[0017]

EXAMPLES The present invention will be described more specifically with reference to examples.

Example 1 A car body formed of a steel plate was coated with zinc phosphate on an object to be coated by cationic electrodeposition coating,
It was baked in a baking oven to form an undercoat coating film having a thickness of about 20 μm. Next, an intermediate paint "TP37" (polyester-made by Kansai Paint Co., Ltd.) on which the undercoat paint film was formed
A melamine resin-based paint) was applied so that the dry coating film thickness would be about 30 μm, and was baked and dried in a baking oven.

Then, in the lower half of the vehicle body, a solid color topcoat enamel paint "Lugabake White" (polyester-melamine resin-based paint, white) and "Rugabake Black" (polyester-melamine resin-based paint, manufactured by Kansai Paint Co., Ltd., (Black color) and a dry liquid coating thickness of approx.
It was coated so as to have a thickness of 5 μm, and was baked and dried at 140 ° C. for 30 minutes to obtain a first color top-coat cured coating film having gradation in color tone.

Next, a predetermined portion of the lower half of the vehicle body to which the first color top coat has been applied is masked, and the upper half of the unmasked vehicle body is coated with solid color enamel paint "Kansai Paint Co., Ltd." Luger Bake White "
(Polyester-melamine resin-based paint, white) is applied by air spray coating to a dry coating film thickness of about 35 μm, the masking is removed, and then baked and dried at 140 ° C. for 30 minutes to change the color tone. I got a painted car body. This finish is 2 with excellent design effect.
It had a color coating finish and had good coating performance such as adhesion.

Example 2 A car body on which an undercoating film and an intermediate coating film similar to those in Example 1 were formed was used, and the lower half of the car body was manufactured by Kansai Paint Co., Ltd. as a solid color topcoat enamel paint "Ruga Bake White". (Polyester-melamine resin-based paint, white)
And “Luga Bake Black” (polyester-melamine resin-based paint, black) were applied by a rotary atomization type electrostatic coating machine through a two-component mixed paint supply device so that the dry coating film thickness would be about 35 μm. After baking and drying at 30 ° C. for 30 minutes, a top-coat cured coating film of the first color having gradation in the color tone was obtained.

Next, a predetermined portion of the lower half of the vehicle body to which the first color top coat has been applied is masked, and the upper half of the unmasked vehicle body is coated with a solid color enamel paint "Kansai Paint Co., Ltd." Ruger Bake Orange "
(Polyester-melamine resin-based paint, orange color) and "Lugabake Red Violet" (polyester-melamine resin-based paint, magenta) are dry-coated with a rotary atomizing electrostatic coating machine via a two-liquid mixing paint supply device. Film thickness is about 3
After coating to a thickness of 5 μm and removing the masking,
By baking and drying at 140 ° C. for 30 minutes, a two-color painted finished car body having color tone changes in both the upper half and the lower half of the car body was obtained. This finish was a two-color paint finish with a desired design effect and good coating performance such as adhesion.

Comparative Example 1 A car body on which an undercoating film and an intermediate coating film similar to those in Example 1 were formed was used, and the lower half of the car body was coated with a solid color topcoat enamel paint "Lugabakke" manufactured by Kansai Paint Co., Ltd.
"Black" (polyester-melamine resin-based paint, black) was applied by air spray coating so that the dry coating film thickness would be about 35 µm, and baked and dried at 140 ° C for 30 minutes to obtain a top-coat cured coating film of the first color. It was Next, by masking a predetermined portion of the lower half of the vehicle body coated with the first color overcoat, Kansai Paint Co., Ltd. was applied to the upper half of the unmasked vehicle body.
Topcoat enamel paint for solid color "Luga Bake White" (polyester-melamine resin paint, white) is applied by air spray coating to a dry coating thickness of about 35 μm, and after removing the masking, 140 ° C
A car body having a two-color paint finish was obtained by baking and drying for 30 minutes, but this finish was not a two-color paint finish that was excellent in the intended design effect.

Example 3 A car body on which an undercoating film and an intermediate coat film similar to those in Example 1 were formed was used, and the top half base paint "Magicalon NSX6 Silver Metallic" manufactured by Kansai Paint Co., Ltd. ( Acrylic-melamine resin-based paint) and "Magicalon NSX6 Blue Metallic" (acrylic-melamine resin-based paint) were applied by air spray coating through a two-component mixed paint supply device so that the dry coating film thickness would be about 13 μm. After baking and drying at 140 ° C. for 30 minutes, an overcoat base cured coating film of the first color having gradation in the color tone was obtained.

Next, a predetermined portion of the lower half of the vehicle body to which the base coating of the first color is applied is masked, and the upper half of the unmasked vehicle body is coated with the top coating base paint "Magiclon NSX6" manufactured by Kansai Paint Co., Ltd. "Silver" (acrylic-melamine resin-based paint, silver color) is applied by air spray coating so that the dry film thickness is approximately 13 μm.
After removing the masking, an overcoat clear paint "Lugabakke M80 clear" (acrylic-melamine resin-based clear) made by Kansai Paint Co., Ltd. was applied by air spray coating to a dry coating film thickness of about 35 μm. After baking and drying at 140 ° C. for 30 minutes, a two-color paint-finished car body having a change in color tone was obtained. This finish was a two-color paint finish with a desired design effect and good coating performance such as adhesion.

Example 4 A car body on which an undercoating film and an intermediate coating film similar to those in Example 1 were formed was used, and in the lower half of the car body, a top coating base paint "Magicalon NSX6 Silver Metallic" manufactured by Kansai Paint Co., Ltd. ( Acrylic-melamine resin-based paint) and "Magicalon NSX6 Blue Metallic" (acrylic-melamine resin-based paint) were applied by air spray coating through a two-component mixed paint supply device so that the dry coating film thickness would be about 13 μm. After baking and drying at 140 ° C. for 30 minutes, an overcoat base cured coating film of the first color having gradation in the color tone was obtained.

Next, a predetermined portion of the lower half of the vehicle body to which the first color base coating is applied is masked, and the upper half of the unmasked vehicle body is coated with the top coating base paint "Magicalon NSX6" manufactured by Kansai Paint Co., Ltd. "Blue Mica" (acrylic-melamine resin-based paint) and "Magiclon NSX6
Green mica "(acrylic-melamine resin-based paint)
And 2 are coated by air spray coating through a two-component mixed paint supply device to a dry coating thickness of about 13 μm, the masking is removed, and then the top coat clear paint "Lugabakke" manufactured by Kansai Paint Co., Ltd. "M80 clear" (acrylic-melamine resin-based clear) was applied by air spray coating so that the dry coating film thickness would be about 35 μm.
By baking and drying at 0 ° C. for 30 minutes, a two-color paint-finished vehicle body having a change in color tone was obtained. This finish was a two-color paint finish with a desired design effect and good coating performance such as adhesion.

Comparative Example 2 A car body on which an undercoating film and an intermediate coating film similar to those of Example 1 were formed was used, and the lower half of the car body was coated with Kansai Paint Co., Ltd. as an overcoating base paint "Majicron NSX6 Black".
(Acrylic-melamine resin-based paint, black) was applied by air spray coating so that the dry coating film thickness would be about 13 μm, and baked and dried at 140 ° C. for 30 minutes to obtain a top-coat base cured coating film of the first color. . Next, by masking a predetermined part of the lower half of the vehicle body with the first color base coating, the upper half of the unmasked vehicle body is coated with the Kansai Paint Co., Ltd. top coating base paint "Magiclon NSX6 Silver".
(Acrylic-melamine resin-based paint, silver color) was applied by air spray coating so that the dry coating thickness would be about 13 μm, and after removing the masking, the top clear clear paint from Kansai Paint Co., Ltd. Rugerbake M80
"Clear" (acrylic-melamine resin-based clear) was applied by air spray coating so that the dry coating film thickness would be about 35 μm, and baked and dried at 140 ° C. for 30 minutes to obtain a two-color painted finish. This finish was not a two-color paint finish that was excellent in the intended design effect.

[0029]

Industrial Applicability The method of the present invention is a two-color coating finishing method which is capable of widening the tint of the finished coating color and has an excellent design effect.

Claims (3)

[Claims] 1. In the two-color coating finishing method, in the first-color coating, a gradation is formed in the color tone by supplying a coating machine with a color tone that continuously changes, and is baked and dried to obtain the color tone. A cured coating film of the first color having a duration is formed, and then a predetermined portion of the cured coating film of the first color is masked to form a coating color different from the coating film of the first color on the unmasked portion. A two-color coating finishing method having a change in color tone, which comprises coating a second color and baking and drying. 2. In a two-color coating finishing method, in the first color coating, a base paint whose color tone is continuously changed is supplied to a coating machine to form a gradation in the color tone, and baking to dry the color tone. A base cured coating film of the first color having graduation is formed, and then a predetermined portion of the base cured coating film of the first color is masked so that the unmasked portion is different from the base coating film of the first color. The second color base paint that forms the color is applied, and then the masking is removed to remove the first color base cured coating and the second color.
A two-color coating finishing method having a change in color tone, which comprises coating a clear coating on an uncured base coating film of a color, followed by baking and drying. 3. The two-color coating finishing method according to claim 1, wherein the second color paint is a paint whose color tone changes continuously.