JPH11343431A - Metallic coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject coating material capable of giving a coating film having adequate metallic surface gloss by including a bright pigment which is prepared by crushing an evaporated metallic film into the metallic pieces. SOLUTION: This coating material contains a bright pigment, which contains a metal (e.g. aluminum, gold, silver, copper, titanium, or stainless steel) prepared by, e.g. evaporating it onto a base film to form the metallic film thereon, separating the metallic film from the base film and crushing the separated metallic film into the metallic pieces, preferably 100 to 1000 Å thick. The bright pigment for the coating material preferably contains the pigment component at 15% or more (pigment weight concentration). It is preferable to spread the coating material over a base at around 0.1 to 10 g/m<2> as the bright pigment. It is also preferable that the coating material contains the bright pigment at 0.1 to 30 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallic paint capable of forming a coating film having a metallic surface gloss on a metal foil or a metal plated surface.

[0002]

2. Description of the Related Art As metallic paints, paints containing metal flakes such as aluminum flakes are known and used, for example, for painting automobile bodies. Such a metallic paint used for coating an automobile body has a unique design with a so-called glittering feeling.

On the other hand, it is known that parts of electric appliances, parts of automobiles, and the like are provided with a metallic surface gloss such as a mirror surface, instead of the glittering effect of the metallic paint described above. In a component having such a glossy metal surface, a metal thin film is generally deposited on the surface by coating the surface with a metal foil such as an aluminum foil, or by metal plating or metal deposition.

[0004]

However, in the method of covering the surface with a metal foil, wrinkles are partially generated on a substrate having a complicated shape having irregularities on the surface of the substrate, and the metal is uniformly coated. There was a problem that it could not be covered with foil.
Further, in the method using metal plating, it is necessary to be limited to a substrate having conductivity, or to form a conductive layer on the surface of the substrate. Further, it is necessary to immerse the entire base material in the plating bath, the manufacturing process is complicated, and there are various restrictions on facilities. Further, in the method of depositing a metal, it is necessary to set a substrate in a vacuum or reduced-pressure container, and there is a problem that the method cannot be applied to a large-sized substrate. In addition, there is a limit in practical use, such as the need to reduce the pressure in the manufacturing process.

In the conventional method of attaching a metal foil or depositing and depositing a metal thin film by plating or vapor deposition, the gloss of the metal surface may be too strong, such as the mirror gloss. In such a case, a special process such as roughening the surface to make the gloss dull is required.

An object of the present invention is to provide a metallic paint capable of forming a coating film having an appropriate metallic gloss.

[0007]

The metallic paint of the present invention is a metallic paint characterized by containing a glittering pigment obtained by pulverizing a vapor-deposited metal film into a metal piece.

The glitter pigment used in the present invention is not particularly limited as long as it is a glitter pigment obtained by pulverizing a vapor-deposited metal film into a metal piece. Such a brilliant pigment is generally obtained by depositing a metal film on a base film, peeling the base film, and then pulverizing the deposited metal film into metal pieces. The thickness of the deposited metal film, that is, the thickness of a metal piece obtained by pulverization is generally 100 to 1
It is preferably about 000 °. Also, as the degree of grinding,
It is preferable that the particles are pulverized so that the particle size is about 5 μm to about 100 μm.

The material of the deposited metal film is not particularly limited, but for example, aluminum, gold, silver,
Metal films such as copper, brass, titanium, chromium, nickel, nickel chrome, and stainless steel may be used.

The glitter pigment used in the present invention is a glitter pigment obtained by pulverizing a deposited metal film into metal pieces.
A very thin metal piece. Therefore, by performing planar orientation as described later, a metallic coating layer having a flat surface can be formed, and a metallic surface gloss can be provided. Metal flakes such as aluminum flakes used in conventional metallic paints are obtained by pulverizing metal powder or metal foil with a ball mill or the like, but these metal flakes are relatively thick and have a relatively large surface. Due to the unevenness, even if such a metal flake is oriented in a plane, the surface does not become flat, and the metal surface gloss as in the present invention cannot be obtained.

The brilliant pigment used in the present invention is described, for example, in JP-A-2-8268 and International Publication WO93 / 2.
It can be manufactured by the manufacturing method disclosed in, for example, US Pat. For example, a plastic film such as OPP (oriented polypropylene), CPP (crystalline polypropylene) or PET (polyethylene terephthalate) is used as a base film, and a release agent is applied thereon,
Metal deposition is performed on the release agent. After metal deposition, a top coat agent is applied, for example, on the deposition surface to prevent oxidation of the deposited metal. As the release agent and the top coat agent, for example, acrylic resin, vinyl resin, nitrocellulose,
Cellulose resin, polyamide resin, polyester resin,
Resins such as EVA resin, chlorinated PP resin, chlorinated EVA resin, and petroleum resin can be used.

Removing the deposited metal film from the base film;
This is pulverized into a metal piece. In some cases, a release agent and a top coat agent may be attached to the metal piece, and these are generally dissolved in a solvent used as a metallic paint.

The metallic paint of the present invention is prepared by adding the bright pigment obtained as described above, a solvent, and if necessary, a resin serving as a binder and additives. In the metallic paint of the present invention, the pigment weight concentration (PWC) of the glittering pigment is preferably as high as possible, preferably 15% or more, more preferably 50%.
Above, more preferably 70% or more. In a most preferred embodiment according to the invention, the metallic paint consists essentially of a glitter pigment and a solvent. The fact that a metallic paint is substantially composed of a glitter pigment and a solvent means that nothing is contained other than the glitter pigment and the solvent, or that a certain amount of resin or additive is contained. This means that the PWC is 95% or more. By increasing the PWC in the metallic paint, the planar orientation of the glittering pigment can be promoted, the glittering luster of the glittering pigment can be reduced, and better metallic surface gloss can be easily imparted. .

The solvent to be contained in the metallic paint of the present invention is selected in consideration of the type of the release agent and the top coat agent used in the production of the bright pigment or the type of the base coat of the metallic paint. However, for example, toluene, xylene, n-hexane, cyclohexane, methyl acetate, ethyl acetate, isopropyl acetate, n-propyl acetate, n-butyl acetate, isobutyl acetate, methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n -Butyl alcohol, isobutyl alcohol, secondary butyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, propylene Recall monoethyl ether acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, ethylene glycol monoethyl ether acetate and Solvesso 10
And hydrocarbon solvents such as Solvesso 150 (trade name, manufactured by Esso Corporation, aromatic hydrocarbon solvent). When the glitter pigment is obtained as a commercial product such as a metal powder paste, a solvent contained in the metal powder paste may be included.

In the metallic coating material of the present invention, the components other than the glitter pigment and the solvent are preferably as small as possible as described above, but a resin or an additive as a binder can be added as necessary. . As the binder resin, a resin generally used as a film-forming resin can be used, and examples thereof include resins such as an acrylic resin, a vinyl chloride-vinyl acetate copolymer resin, a polyamide resin, a urethane resin, and a polyester resin. Examples of the additives include waxes such as polyethylene wax and polypropylene wax, and plasticizers and dispersants.

The coating amount of the metallic paint of the present invention is not particularly limited, but the coating amount of the glitter pigment is preferably about 0.1 to 10 g / m ² . The content of the brilliant pigment in the metallic paint of the present invention is not particularly limited, but is preferably about 0.1 to 30% by weight, more preferably 0.2 to 20% by weight.
If the content of the brilliant pigment is too large, the appearance becomes poor due to reduced atomization at the time of coating. Conversely, if the content of the brilliant pigment is too small, the design of the metal surface gloss is reduced.

[0017] The method for forming a multilayer coating film of the present invention is characterized in that at least one layer of the multilayer coating film is formed using the metallic paint of the present invention. In the method for forming a laminated coating film of the present invention, preferably, the base coating film layer is formed before forming the coating film layer of the metallic paint. The base coating film layer may be a clear coating film or a colored coating film, but is preferably a clear coating film in order to impart better metal surface gloss. In the case of a colored coating, white or gray coloring is preferable for metallic luster such as aluminum. Further, the base coating layer may be formed from a solvent type coating or a powder coating.

Further, in a preferred embodiment according to the method for forming a laminated coating film of the present invention, after applying the base coating layer, the glitter pigment in the metallic paint can be oriented along the surface of the base coating layer. It is characterized in that the base coating layer is cured to a certain extent, and thereafter a metallic paint is applied. By applying the metallic paint after curing the base coating layer to some extent, the glitter pigment in the metallic paint can be oriented along the surface of the base coating layer without sinking, Good metal surface gloss can be obtained. It is preferable that the degree of curing of the base coating layer is appropriately selected depending on the type of the base coating layer, the type of the brilliant pigment of the metallic paint, the type of the solvent, and the like.

In the method for forming a laminated coating film of the present invention,
Preferably, after forming a coating layer of a metallic paint, a clear overcoat layer is formed thereon. The metallic paint of the present invention, as described above, it is preferable to reduce the amount of the binder resin as much as possible, but when the amount of the binder resin is small or no binder resin is used, the glittering pigment is easily peeled off from the surface. Become. Therefore, by forming the clear topcoat layer on the coating layer of the metallic paint, it is possible to prevent the glitter pigment from peeling off. As the clear overcoat layer, a general clear coating film can be used, and further, a so-called turbid clear coating film having a translucency may be used. Further, the clear top coat layer may be formed from a solvent type paint or a powder paint. As the solvent-type paint, a one-pack type paint may be used, or a two-pack type resin such as a two-pack type urethane resin paint may be used.

In a preferred embodiment according to the method of forming a laminated coating film of the present invention, a step of forming a base coating layer on an object to be coated, and a step of pulverizing a vapor-deposited metal film on the base coating layer to form a metal layer The method includes a step of forming a metallic coating layer containing the glitter pigment as a piece, and a step of forming a clear overcoat layer on the metallic coating layer.

In one example according to the above embodiment, the base coating layer is formed from a clear paint, and the clear top coat layer is formed from a clear paint or a cloudy clear paint. In another example, the base coat layer is formed from a colored paint, and the clear topcoat layer is formed from a clear paint or a cloudy clear paint.

The laminated coating of a preferred embodiment according to the present invention is a laminated coating in which a base coating layer is applied, a metallic paint is applied, and a clear topcoat layer is formed thereon. That is, between the base coating layer and the clear topcoat layer,
A metallic coating layer containing a brilliant pigment formed by pulverizing the deposited metal film into metal pieces is provided, and the brilliant pigment in the metallic coating layer is substantially planarly oriented to provide a metallic surface gloss. It is a laminated coating film characterized by showing the following.

As the base coating layer, a clear coating or a colored coating is used, and a clear coating is preferable. FIG. 1 is a sectional view showing a preferred embodiment according to the laminated coating film of the present invention. A metallic coating layer 2 is provided between the base coating layer 1 and the clear topcoat layer 3. In this embodiment, a clear coating film is formed as the base coating layer 1.

As shown in FIG. 1, the thickness of the metallic coating layer 2 is much smaller than the thickness of the base coating layer 1 and the clear coating top coating layer 3. In a state sandwiched between them, they are oriented in a plane. In this way, the glittering pigment, which is obtained by pulverizing the deposited metal film into a metal piece, is oriented in a planar manner, thereby exhibiting good metallic surface gloss. Although the thickness of the base coating layer 1 is not particularly limited,
As an example, about 30 to 200 μm, preferably 50 to 1
The thickness is about 50 μm. Also, the thickness of the clear overcoat layer 3 is not particularly limited, but is, for example, about 10 to 50 μm, preferably about 20 to 40 μm. The thickness of the metallic coating layer 2 is preferably thin, generally 5 μm or less, preferably 2 μm.
m or less is preferred.

When the laminated coating film of the present invention is formed on a metal plate such as a steel plate, the laminated coating film of the present invention may be formed after forming an undercoat layer or an intermediate coating layer. For example, after applying an electrodeposition coating on a metal plate, an intermediate coating may be applied, and the laminated coating film of the present invention may be formed on the intermediate coating film.
The color of the intermediate coating film is not particularly limited, but when aluminum powder or the like is used as the glittering pigment, the coloring of the intermediate coating film is made to be a gray system, so that a better metallic surface gloss can be obtained. Obtainable.

According to the present invention, a metallic surface gloss having a soft and moderate gloss can be imparted to an article by forming a coating film, instead of a strong gloss such as a mirror gloss. Therefore, it is possible to impart a soft and moderate metallic surface gloss to a vehicle part such as a handle or a wheel, a vehicle body, or the like, or an electric appliance or other articles by a simple process.
In addition, it is possible to impart a metallic surface gloss to an article having a complicated surface shape that cannot be covered with a metal foil.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to specific examples, but the present invention is not limited to the following examples.

Preparation of Aluminum Paint An aluminum paint containing aluminum powder obtained by pulverizing an aluminum vapor-deposited film was prepared as a metallic paint. The following commercially available aluminum powder paste was used as the aluminum powder obtained by pulverizing the deposited metal film.・ Product name "DECOMET1001 / 10" ... CARL
Manufactured by Schlenk AG, aluminum powder content 1
0% by weight ・ Product name “METALURE / L55700”… ECK
ART-WERKE, aluminum powder content 10% by weight

For comparison, the following aluminum paste containing aluminum flakes used for general metallic coatings, obtained by pulverizing aluminum powder or aluminum foil with a ball mill or the like was used.・ Product name “Alpaste 7160”: manufactured by Toyo Aluminum Co., Ltd., aluminum flake content 64% by weight

Using the above aluminum paste, Table 1
An aluminum paint according to the present invention was prepared at the compounding ratio shown in Table 1. The thermosetting acrylic resin has a solid content of 5%.
A thermosetting acrylic resin having 0% by weight, a number average molecular weight of 21,000, a hydroxyl value of 45 and an acid value of 15 was used.

[0031]

[Table 1]

Formation of laminated coating film Thickness 0.8 mm, 10 cm × 30 c treated with zinc phosphate
After applying a cationic electrodeposition paint (trade name “Power Top U-50”, a cationic type electrodeposition paint manufactured by Nippon Paint Co., Ltd.) on a dull steel sheet having a dry film thickness of 20 μm, the temperature is 160 ° C. For 30 minutes. Next, a gray intermediate coating (trade name “Olga P
-2 gray ", a polyester melamine-based paint manufactured by Nippon Paint Co., Ltd.) was spray-coated so as to have a dry film thickness of 30 µm, and baked at 140 ° C for 20 minutes to form an intermediate coating film.

Next, a first layer (base coating layer), a second layer (metallic coating layer), and a third layer (clear topcoat layer) were formed in the combinations shown in Table 2. The first layer is electrostatically coated or spray-coated so as to have a dry film thickness of 100 μm, the second layer is spray-coated so as to have a dry film thickness of 1 μm, and the third layer is so as to have a dry film thickness of 30 μm. Was spray painted. The baking of the second layer is a step of evaporating the solvent for those containing no thermosetting acrylic resin.

The following paints were used for the first and third layers.・ First-layer paint Powder clear paint: Trade name “Powax A50 Clear”, acrylic paint made by Nippon Paint Co., Ltd. Powder white paint: Trade name “Powax A50 White”, acrylic paint made by Nippon Paint Co., Ltd. Paint Powder black paint: Trade name "Powax A30 Black", Nippon Paint Co., Ltd. acrylic epoxy paint Solvent type clear paint ... Trade name "Super Luck M-90 Clear", Nippon Paint Co., Ltd. acrylic / melamine paint Solvent type White paint… Product name “Super Rack M-90”
White ”, Nippon Paint Co., Ltd. acrylic / melamine paint

-Paint for third layer O-150 clear: trade name "Super Rack O-150"
Clear, Nippon Paint's acrylic / melamine-based paint NAX Sperioclya ... Brand name "NAX Sperioclya", Nippon Paint Co., Ltd. isocyanate-curable two-pack paint Red-based turbid clearer ... Gin red DPP-BO (red transparent pigment,
1.0% by weight (Ciba-Geigy Co., Ltd.), dispersed to 5 μm or less, and made into a coating (concealing film thickness of 300 μm or more). Powder clear ... Product name "Powax A50 Clear", Nippon Paint acrylic epoxy paint

With respect to the coating films obtained in Examples 1 to 11 and Comparative Example 1, the appearance, the glossiness on the metal surface, and the adhesion were evaluated as follows. Appearance The appearance of the coating film was visually evaluated according to the following criteria. 5: Smooth and considerably glossy 4: There is glossiness. 3: Normal feeling. 2: I feel blurred. 1: There is no glossiness at all.

Metal surface gloss The metal surface gloss was visually evaluated according to the following criteria. 5: There is considerable metal surface gloss. 4: There is gloss on the metal surface. 3: Normal feeling. 2: I feel blurred. 1: There is no metallic surface gloss.

Holding the cutting blade of the adhesive cutter (NT cutter S type, A type or equivalent) at about 30 degrees with respect to the coating film, draw 11 parallel lines at 2 mm intervals to reach the substrate, Eleven parallel lines at 2 mm intervals perpendicular to the parallel lines were drawn to form 100 grids on the coating film. An adhesive tape (Nichiban industrial cellophane tape) was pressed uniformly on the grid with a fingertip so as not to leave air bubbles, and immediately, one end of the adhesive tape was held, and about 4
The tape was peeled off from the coating by suddenly pulling it at an angle of 5 degrees, and the number of grids in 100 pieces where the coating was peeled was measured. Table 2 shows the evaluation results.

[0039]

[Table 2]

As is clear from the results in Table 2, the laminated coating films of Examples 1 to 11 according to the present invention all show better metal surface gloss and better adhesion than the laminated coating film of Comparative Example 1. ing. The laminated coating films of Examples 4 and 5 using the aluminum coatings of Preparation Examples 4 and 5 containing a binder resin had slightly less metallic luster than the laminated coating films of other examples not using the binder resin. Thus, it is understood that the metallic paint of the present invention preferably has a resin binder content as small as possible.

Further, as is apparent from the comparison between Example 8 and other Examples, it can be seen that providing a base coating layer gives a better metallic gloss. Moreover, as is clear from the comparison between Example 1 and Example 9, by performing the curing of the base coating layer more sufficiently, the planar orientation of the aluminum powder is further increased, and a better metal surface gloss is obtained. It can be seen that it can be obtained.

[0042]

According to the present invention, a metallic surface gloss can be imparted to an article by forming a coating film, which is simpler than conventional methods of coating with metal foil, metal plating and metal vapor deposition. Metallic surface gloss can be provided. Furthermore, according to the conventional methods, the metal surface gloss is too strong such as the mirror surface gloss. However, according to the present invention, a softer and moderate metal surface gloss can be provided. Therefore,
The present invention can be applied to a wide range of fields such as automobile parts such as wheels and handles, automobile bodies, and home electric appliances.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a laminated coating film according to an embodiment of the present invention.

[Explanation of symbols]

 1: Base coating layer 2: Metallic coating layer 3: Clear overcoat layer

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI C09D 5/10 C09D 5/10

Claims (9)

[Claims] 1. A metallic paint comprising a glitter pigment obtained by pulverizing a deposited metal film into metal pieces. 2. The metallic paint according to claim 1, wherein the glitter pigment is aluminum powder. 3. The metallic paint according to claim 1, wherein the pigment weight concentration (PWC) is 15% or more. 4. The metallic paint according to claim 1, wherein the pigment weight concentration (PWC) is 50% or more. 5. The method according to claim 1, wherein the metallic paint is substantially composed of the glitter pigment and a solvent.
5. The metallic paint according to any one of items 4 to 4. 6. A pigment weight concentration (PWC) of the glitter pigment is 15% or more, comprising a glitter pigment obtained by pulverizing a vapor-deposited metal film into a metal piece, a solvent, and a binder resin. Metallic paint. 7. A pigment containing a glitter pigment obtained by pulverizing a vapor-deposited metal film into metal pieces, a solvent, and a binder resin, wherein the pigment weight concentration (PWC) of the glitter pigment is 50% or more. Metallic paint. 8. A step of forming a base coating layer on an object to be coated, and applying a metallic paint containing a brilliant pigment on the base coating layer by pulverizing a deposited metal film into metal pieces. A metallic paint used in a method for forming a laminated coating film, comprising: a step of forming a film layer; and a step of forming a clear overcoat layer on the metallic coating layer. 9. Between the base coating layer and the clear topcoat layer,
A metallic coating layer containing a brilliant pigment formed by pulverizing the deposited metal film into metal pieces is provided, and the brilliant pigment in the metallic coating layer is substantially planarly oriented to form a metal surface. A metallic paint for forming the metallic coating layer in the glossy laminated coating film.