JPH03239769A - Metallic paint and method for coating therewith - Google Patents

Abstract

PURPOSE:To provide a metallic paint which is free from the settling of pigment and gives a coating film excellent in brightness by mixing a silver-coated flake, obtd. by coating a glass flake with silver, into the coating material. CONSTITUTION:A silver-coated flake is prepd. by coating a glass flake with silver by, e.g. electroless plating. The coated flake is mixed, as a metallic pigment, with a base resin (e.g. an acrylic resin), a crosslinker (e.g. a methylolated melamine resin), a solvent, and other pigments if necessary, giving a metallic paint. The paints is applied to, e.g. the surface of an exterior panel of an automobile or motorcycle, and a clear paint is applied to the coated surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel metallic paint and a coating method thereof.

A paint film made of metallic paint sparkles as incident light from the outside reflects on the scale-like metallic pigment contained in the paint film, and the paint film has a rich variety of colors that vary with the various tones of the paint film. It has a unique appearance with excellent cosmetic properties, and is often applied to the exterior panels of automobiles and motorcycles.

Conventionally, the above-mentioned metallic pigments include flaky aluminum powder; mica flake particles coated with metal oxides such as titanium oxide and iron oxide; graphite particles; iron oxide particles whose main component is α-iron oxide crystal particles; etc. are often used. However, although these metallic pigments have normal glitter properties (sparkling feeling),
Furthermore, it has been desired to develop a metallic coating film exhibiting a stronger glitter than these, and these metallic pigments have not been sufficient. Furthermore, among these particles, iron oxide particles having excellent glittering properties have a problem in that they have a large specific gravity and tend to settle in paints.

The purpose of the present invention is to develop a metallic paint and a coating method thereof that can exhibit strong glitter and eliminate all of the above-mentioned defects.As a result of intensive research,
The inventors have discovered that the above object can be achieved by using silver-coated glass flakes as a metallic pigment, and have completed the present invention.

That is, the present invention provides (1) a metallic paint containing scale-like particles formed by coating the surface of glass flakes with silver as a metallic pigment, and (2) coating the metallic paint, and then applying the metallic paint to the coated surface. The present invention relates to a metallic coating method in which the metallic pigment of the methnock coating is a scale-like particle formed by coating the surface of glass flakes with silver in the step of coating a clear coating.

The metallic paint in the present invention is a liquid paint whose main components are a metallic pigment, a vehicle component, and a solvent.
Furthermore, coloring pigments and the like can be added as necessary.

Metallic pigments are scale-like particles made by coating the surfaces of flaky glass particles with silver. The size of the flaky glass particles is as follows: ♀:@' ~40μ,
The thickness is preferably in the range of 115 to 1/20 in the longitudinal direction,
The main component is ZnO and B20. It may also contain some amounts of other ingredients. Moreover, electroless plating is suitable as a method for coating the surface of the flaky glass particles with silver. The coverage is 0.0 based on the silver film thickness.
1 to 0.3LL, particularly 0.02 to O.lu is preferred.

Preferably, the silver to be coated is pure silver. Furthermore, the surface of the silver-coated glass flakes may be subjected to an appropriate surface treatment.

The vehicle component is preferably a crosslinked curable resin composition containing a base resin and a crosslinking agent as main components.The base resin includes acrylic resin, polyester resin, or alkyd resin having a crosslinkable functional group, and the crosslinking agent is Methylolated and/or alkyl etherified melamine resins, urea resins, and boisocyanate compounds (including blocked compounds) are preferred. Also, self-curing resins and thermoplastic resins can be used.

As the solvent, an organic solvent for paint and/or water can be used.

In the present invention, the amount of the silver-coated glass flake metallic pigment is 100 parts by weight (solid content) of the vehicle component.
It is preferably 0.1 to 30 parts by weight.

The metallic paint of the present invention includes the above-mentioned components, and, if necessary, color pigments, other metallic pigments (e.g., aluminum pigments, iron oxide pigments, etc.), and interference color pigments (e.g., mica, mica coated with metal oxides). etc.) may be blended to the extent that the metallic feel based on the silver-coated glass flake metallic pigment is not inhibited.

The form of the metallic paint of the present invention includes an organic solution type, a high solid type, a non-aqueous dispersion type, an aqueous solution type, and an aqueous dispersion type, and can be prepared by a method known per se.

The metallic coating method of the present invention is characterized in that the metallic paint of the present invention described above is applied, and then a clear paint is applied to the coated surface.

A clear paint is a paint that forms a transparent film, and is made of a base resin and a crosslinking agent as main components, and further contains organic solvents, water, pigments, etc. as necessary, and can be used in known versions.

The base resin in the clear paint is preferably one with excellent weather resistance, smoothness, and sharpness, such as acrylic resin, polyester resin, alkyd resin, and fluororesin, which have functional groups that react with the crosslinking agent. (For example, a hydroxyl group, a carboxyl group, an epoxy group, a glycidyl group). The crosslinking agent reacts with the base resin to three-dimensionally crosslink and cure it, so specific examples include methylolated and/or alkyl etherified melamine resins, urea resins, polyisocyanate compounds (including blocked products), etc. can be given.

The clear paint can contain colored pigments and the like within a range that does not reduce transparency, and may be in the form of a powder, but organic solvents and/or water may be used as a solvent or dispersed in the clear paint. A liquid medium is preferred.

The coating method of the present invention is characterized in that the above-mentioned metallic paint and clear paint are applied.

The object to be coated (for example, metal or plastic) is subjected to surface treatment, primer coating, and intermediate coating as necessary, and then the metallic coating is applied. Although the coating film thickness is not limited, it is preferably 10 to 30 μm based on the cured coating film. After the metallic coating film is cured at room temperature to 160°C, or in an uncured state, the above-mentioned clear paint is applied to the surface of the coating film. The clear coating film is 20~ based on the cured coating film.
A range of 1001,L is suitable. After applying the clear paint, it is preferable to harden it in a room fA to 160°C.

The clear coating film may be a single layer, but may be two or more layers as necessary.

The metallic feel (glitter) of the metallic paint film formed using the metallic paint of the present invention is significantly superior to that of those using conventional metallic pigments, and it shines brightly even under sunlight. A metallic coating is obtained. In addition, the silver-coated glass flake pigment has a specific gravity of approximately 3.
Therefore, it hardly settles in the paint.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Note that parts and % indicate parts by weight and % by weight.

Example 1 Metallic paint: 15% styrene, 15% methyl methacrylate, 40% methyl methacrylate, 13% 2-ethylhexyl acrylate, 15 hydroxyethyl methacrylate
% and 2% acrylic acid were copolymerized in Kyjirol using a polymerization initiator, azobisisobutyronitrile, to produce an acrylic resin solution with a heating residue of 5%, a solution acid value of 80, and a solution viscosity of Y (Gardner 25°C). AC-1 was obtained.

A metallic paint was prepared using this acrylic resin solution AC-1 with the following formulation.

#4/208C).

Comparative Examples 1-2 Two types of comparative metallic paints were prepared in the same manner as in Example 1 using the following formulations.

(Note 1) Product name Kneepan 8SE manufactured by Mitsui Toatsu Chemical ■ (Note 2) Metashine RCFSX-2 manufactured by Nippon Sheet Glass ■
015PS (9031) [Average thickness 2±1μ, longitudinal direction 15±5μ (Note 3) Manufactured by Mitsubishi Chemical Corporation Part name Mitsubishi Carbon Black MA-100 The above components were mixed and dispersed, and then 35 parts of ethyl acetate,
A mixed solvent consisting of 35 parts of toluene, 10 parts of isobutanol, and 20 parts of Swasol 1000 (Maruzen Sekiyu) has a viscosity of 14 seconds (Ford Cup (Note 4) Sparklon 1500X (Teika ■Product) (Note 5) Toyo Aluminum ■Product Alpaste 64O
NS Example 2, Comparative Examples 3 to 4 Metallic coating film Epoxy polyamine cationic electrolyte paint was electrodeposited on a dull copper plate with a thickness of 0.8 mm that had been subjected to zinc phosphate chemical conversion treatment so that the cured coating film was about 20 μm. After baking at 160°C for 30 minutes, sand with #400 sandpaper and wipe with petroleum benzine to degrease. Next, air spray paint Surf Acer, an intermediate coating for automobiles, to a cured film of approximately 25 LL, and after baking at 140°C for 30 minutes, #40
Sand with water using a No. 0 sand vapor, drain and dry.

Then, it is degreased with petroleum benzine and used as a material for testing.

On top of that, apply the metallic paint obtained in Example 1 and Comparative Example 12 using an air spray gun (Waigoo # manufactured by Iwata Painting Co., Ltd.).
71) to a cured film thickness of 15 to 20 μm, and then apply a thermosetting melamine resin/acrylic resin clear paint to a cured film thickness of 35 to 40 μm after applying a thermosetting melamine resin/acrylic resin clear paint for 5 minutes at room temperature. Apply by air spray. Then, it was observed at room temperature for 10 minutes to confirm the following effects. That is, the coating film obtained in Example 2 exhibits a unique luster that far exceeds that of aluminum or iron oxide when exposed to direct sunlight, and shows little decrease in luster when exposed to sunlight. In addition, the brightness of the metallic coating film of Example 2 is not limited to highlights,
It shines to the same degree from all angles, and the way it shines is not only on the surface of the paint film, but also from within the film, giving it a brilliance similar to that of diamonds, giving it a three-dimensional color appearance.

Claims (2)

[Claims] (1) A metallic paint containing scaly particles formed by coating the surface of glass flakes with silver as a metallic pigment. (2) In the step of applying a metallic paint and then applying a clear paint to the painted surface, the metallic pigment of the metallic paint is characterized by being scale-like particles formed by coating the surface of glass flakes with silver. Metallic painting method