JP2002060655A - Method for toning metallic coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical method for toning a metallic coating material which enables toning without repeated remaking. SOLUTION: The method for toning a metallic coating material comprises mixing a coating material composed of (A) a primary color coating material containing a color pigment and (B) a luster base coating material which does not contain a color pigment or contains a color pigment in such an amount as not to adversely affect the transparency of the coating material and contains at least one luster pigment to be selected from an aluminum powder, a pearlescent pigment, and mica to effect toning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for toning a metallic paint, and more particularly, to a method for toning a metallic paint comprising a primary color paint containing a color pigment and a bright base paint containing a bright pigment. It is about.

[0002]

2. Description of the Related Art As a paint for an automobile body, a metallic paint containing a coloring pigment and a bright pigment is known. Toning of such a metallic paint is performed by blending and mixing an arbitrary amount of a resin, a pigment, and a solvent in advance in accordance with an expected color, similarly to a solid color paint including a normal coloring pigment. .

[0003]

However, since the metallic paint contains a brilliant pigment, it is difficult to adjust the color, and there is a problem that the metallic paint must be re-formed by changing the mixing ratio many times.

[0004] Accordingly, an object of the present invention is to provide an economical method of toning a metallic paint which can be toned without reworking many times.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, when a primary color paint containing a color pigment and a glitter base paint containing a glitter pigment are separately used, It has been found that the number of times of toning can be reduced, and the certainty of toning increases.

The present invention has been made based on such novel findings.

That is, the method for toning a metallic paint of the present invention comprises (A) a primary color paint containing a color pigment, and (B) an amount of a color pigment containing no color pigment or not impairing the transparency of the paint. And a mixture of a glitter base paint containing at least one glitter pigment selected from aluminum powder, pearl pigments, and mica.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The metallic paint used in the present invention comprises (A)
A primary color paint containing a color pigment; and (B) at least one type of luminosity selected from aluminum powder, pearl pigment, and mica, containing no color pigment or containing an amount of a color pigment that does not impair the transparency of the paint. Bright base paint containing pigment,
Consists of

The metallic paint used in the present invention may be directly applied to a metal or plastic automobile outer panel or the like. Usually, however, an undercoat paint (such as a cationic electrodeposition paint) or the like is applied to these objects. It is preferable to apply an intermediate coating (which can be omitted) or the like in advance, and apply the coating to an object obtained by curing the coating.

As these cationic electrodeposition coatings and intermediate coatings, it is preferable to use those exemplified below.

[0012] Cationic electrodeposition coating material: A known one obtained by blending a pigment or various additives as necessary with an aqueous solution or aqueous dispersion of a salt of a cationic polymer compound can be used. The type is not particularly limited. Examples of the cationic polymer compound include those in which an amino group is introduced into an acrylic resin or an epoxy resin having a crosslinkable functional group, which is neutralized with an organic acid or an inorganic acid to make the compound water-soluble or water-dispersed. Let me know. As a crosslinking agent for curing these resins, block polyisocyanate, alicyclic epoxy resin and the like are suitable.

A metal material such as an automobile outer panel or a color bumper is immersed as a cathode in the bath of the cationic electrodeposition paint, and a current is applied between the anode and the anode under ordinary conditions to apply the resin or the like to the material. Is deposited to perform electrodeposition coating.
The thickness of the electrodeposited coating is usually 10 to 4 based on the cured coating.
0 μm is preferable, and the electrodeposition coating film is generally 140 to 2 μm.
Crosslinking and curing can be performed by heating at 20 ° C. for 10 to 40 minutes. In the present invention, it is preferable to apply the intermediate coating after curing the electrodeposition coating film.

Intermediate paint: A paint to be applied to an undercoating surface such as an electrodeposition paint, which contains a resin component and a solvent, and further contains a coloring pigment, an extender pigment, and other paint additives as required. It is used to improve the smoothness, sharpness, gloss, etc. of the formed multilayer coating film.

The resin component in the intermediate coating composition is preferably a thermosetting resin composition. Specifically, a base resin such as an acrylic resin, a polyester resin, or an alkyd resin having a crosslinkable functional group such as a hydroxyl group is added to a melamine resin or a urea resin. ,
Examples thereof include those in which a crosslinking agent such as a polyisocyanate compound (including a block body) is used in combination, and an organic solvent or water can be used as a solvent.

The intermediate coating can be applied to the uncured or cured electrodeposition coating by a method such as electrostatic coating, air spray, or airless spray. The thickness is preferably in the range of 10 to 50 μm. The coating can be cross-linked and cured by heating to 100-170 ° C.

The metallic paint of the present invention may be applied directly to an object to be coated such as a metal or plastic automobile outer plate, but the undercoat or intermediate coating (optional) may be applied to these objects. It is preferable to apply the coating on a coating surface obtained by coating and curing.

The primary color paint (A) containing a color pigment contains a resin component, a solvent, and a color pigment as essential components, and further contains a heat extender and an extender pigment and other paint additives as required. It is a curable paint.

As the resin component, a thermosetting resin composition is preferable. Specifically, a base resin such as an acrylic resin, a polyester resin, an alkyd resin, or a urethane resin having a crosslinkable functional group such as a hydroxyl group is used, and a melamine resin, Examples thereof include those used in combination with a crosslinking agent such as a urea resin and a polyisocyanate compound (including a block body). These are dissolved or dispersed in a solvent such as an organic solvent and / or water.

The coloring pigments include titanium oxide, zinc oxide, lithopone, carbon black, black iron oxide, loess,
Inorganic color pigments such as yellow iron oxide, titanium yellow, red iron oxide, iron oxide powder, ultramarine blue, and chromium oxide; and organic color pigments such as Hansa Yellow, Permanent Yellow, Permanent Red, Phthalocyanine Blue, and Phthalocyanine Green.

A brilliant base paint (B) containing no coloring pigment or containing an amount of a coloring pigment which does not impair the transparency of the paint, and containing at least one brilliant pigment selected from aluminum powder, pearl pigment and mica ) Is a liquid paint containing a resin component, a solvent, and a bright pigment as essential components, and further containing a coloring pigment, an extender pigment, and other paint additives as necessary.

As the resin component, a thermosetting resin composition is preferable. Specifically, a base resin such as an acrylic resin, a polyester resin, an alkyd resin, or a urethane resin having a crosslinkable functional group is used as a melamine resin, a urea resin, or a polyether resin. Examples thereof include those used in combination with a crosslinking agent such as an isocyanate compound (including a block body), and these can be used as dissolved or dispersed in an organic solvent and / or water.

Examples of the brilliant pigment include ordinary non-leafing type aluminum pigments, aluminum powder such as aluminum paste, pigments called white mica or silver mica showing a turbid color from white to silver, and various pigments due to light interference. And light interference pigments having the following color tone. The former white mica or silver mica pigment is obtained by coating the surface of flaky mica powder with titanium oxide, and generally has a longitudinal diameter of 5 to 60 μm, particularly 5 to 25 μm, and a thickness of 0.25 to 1 μm. 0.5 μm, especially 0.
At 5-1 μm, the coating thickness of the titanium oxide is 90-160 nm based on the optical thickness and 40-70 nm based on the geometric thickness in order to finish in white pearl or silver pearl. It is preferred that
On the other hand, examples of light interference pigments include silica flakes, alumina flakes, mica flakes, mica flakes coated with titanium oxide, iron oxide, and the like (the thickness of these coatings is thicker than the above white mica or silver mica pigments). And their longitudinal direction is 5 to 60 μm, especially 5 to 60 μm.
It is preferable that the thickness is 25 μm and the thickness is 0.25 to 1.5 μm.

The blending amount of the bright pigment is not strictly limited, but is usually preferably 3 to 20 parts by weight, particularly preferably 7 to 13 parts by weight, per 100 parts by weight of the total solid content of the resin component. (B) may further contain silver-plated glass flakes, titanium-coated graphite, metal titanium flakes, plate-like iron oxide, phthalocyanine flakes, and the like, if necessary.

In the method for toning a metallic paint according to the present invention, the primary color paint (A) containing a color pigment described above and the color pigment not containing the color pigment or containing an amount of the color pigment which does not impair the transparency of the paint are contained. Then, the toning is performed by mixing a glitter base paint (B) containing at least one glitter pigment selected from aluminum powder, pearl pigment and mica.

[0026]

The present invention will be described more specifically below with reference to examples and comparative examples. Parts and% are based on weight unless otherwise specified.

<Preparation of primary color paint A> Yellow primary color containing isoindolinone; 2.5 parts, black primary color containing carbon black; 1.0 part, red primary color containing quinacridone red; 2.0 parts, A primary color paint A is prepared by mixing and mixing 1.0 part of a white primary color containing microtitanium; and 0.5 part of a purple primary color containing dioxane violet.

<Adjustment of glitter base paint B> A glitter base paint B is prepared by mixing 60 parts of a polyester resin varnish, 33 parts of a solvent, and 7 parts of aluminum powder.

<Example 1> Toning is performed by adding 7 parts of primary color paint A to 93 parts of bright base paint B.

<Comparative Example 1> Polyester resin varnish; 6
0 parts, solvent: 33 parts, yellow primary color containing isoindolinone; 2.5 parts, black primary color containing carbon black; 1.0 part, red primary color containing quinacridone red; 2.0 parts, microtitanium A primary white color containing
1.0 part, purple primary color containing dioxane violet; 0.5 part, aluminum powder; 7 parts were charged, and toning was performed while further adding each primary color.

<Toning Number Test> The number of toning times for a sample color is determined for three lots, and the number of times for each lot is shown.

<Color Reproducibility Test> The results of color measurement by a three-angle colorimetry system are shown.

The results of each test are shown in Table 1.

[0034]

[Table 1]

[0035]

According to the present invention, the number of toning of a metallic paint can be reduced by using a primary color paint containing a color pigment and a glitter base paint containing a glitter pigment separately, and the toning certainty can be reduced. Increase.

Claims (2)

[Claims] 1. A method for toning a metallic paint, comprising:
(A) a primary color paint containing a color pigment, and (B) at least one selected from aluminum powder, pearl pigment, and mica, containing no color pigment or containing a color pigment in an amount that does not impair the transparency of the paint. A method for toning a metallic paint, comprising mixing a paint consisting of a glitter base paint containing a kind of glitter pigment. 2. The method for toning a metallic paint according to claim 1, wherein (A) the primary color paint and (B) the bright base paint have the same paint components except for the coloring pigment and the bright pigment. .