JP2000334372A - Coating film forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly bond a bead-like brilliant material in a single layer, in forming a metallic coating film, by forming a binder layer having a specific viscosity and a film thickness and applyng the bead-like brilliant material to the binder layer under a condition wherein supply air pressure and the discharge amt. of a coating gun are specified. SOLUTION: When a metallic coating film layer 4 containing brilliant pigment prepared by grinding a metallized film into metal crushed pieces, a coating layer containing a bead-like brilliant material 2 and a clear coating film layer 1 are successively formed on a base material 6 having a base coating film layer 5 formed thereon to form a metallic coating film, the coating film layer containing the bead-like brilliant material 2 is fomed by forming a binder layer 3 having a viscosity of 2×104-3×106 poise and a thickness of 2-30 μm and applying the bead-like brilliant material 2 on the binder layer under such a condition that the supply air pressure of the bead-like brilliant material 2 is 1.0-5.0 kg/cm2 and the discharge amt. of a coating gun is 50-800 g/min by using a coating machine or coating gun so as to arrange the same in a laminar state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a metallic coating film on a surface of an object to be coated, particularly a bead-like glittering material layer used for coating automotive parts and the like.

[0002]

2. Description of the Related Art As a method of forming a coating film which exhibits different colors depending on the viewing direction, such as a so-called iridescent color, a coating film containing glass or resin beads is provided on a coating film containing a brilliant pigment, and their reflection interference effect is provided. Japanese Patent Application No. 10-2548 to obtain a coating film exhibiting a unique color tone or brightness according to
No. 74 has been filed.

In order to obtain a desired design in this laminated coating film, it is necessary to uniformly and uniformly adhere a bead-like glittering material in a state close to close packing. However, when the beaded glittering material is simply sprayed on the object to be coated, the glittering material overlaps and coating unevenness occurs, so that a uniform bead layer cannot be formed and the intended design can be stably formed. I couldn't get it.

Japanese Patent Application Laid-Open No. Hei 6-170322 discloses a method of coating glass beads using a powder coating machine. In this method, the glass beads are partially coated on the surface of the object to be coated. In addition, there is a problem that they may adhere to each other, or irregularities may occur irregularly, and that the object to be coated needs to be rotated, which requires a large-scale apparatus.

[0005]

In order to obtain a coating film having a unique color tone or luminance due to the reflection interference effect generated by the specific beaded glittering material and the reflective coating film on the surface of the object to be coated, the beaded glittering material is used. In a state close to fine packing, it is necessary to uniformly and uniformly adhere. In the present invention, this excellent design is
Provided is a method for forming a coating film that can be supplied stably.

That is, a metallic coating layer containing a brilliant pigment formed by pulverizing a metal-deposited film into metal flakes, a coating layer containing a bead-like brilliant material, and a clear coating layer are sequentially formed. The present invention provides a method for forming a film, in which the beaded glittering material is uniformly attached in a single layer.

[0007]

SUMMARY OF THE INVENTION The present invention provides a metallic coating layer containing a brilliant pigment formed by pulverizing a metal vapor-deposited film into metal flakes on a base material having a base coating layer formed thereon, and a bead-like layer. In the method for forming a metallic coating film in which a coating layer containing a glittering material and a clear coating layer are sequentially formed, the coating layer containing the beaded glittering material may have 2 × 10 ^{4 to} 3 × 10 ⁶ poise. After forming a binder layer having a viscosity and a film thickness of 2 to 30 μm, a beaded glittering material is applied thereon by using a coating machine and a coating gun, and the supply air pressure of the beaded glittering material is set to 1.0.
The present invention provides a method for forming a metallic coating film, which is a layer obtained by coating under conditions of up to 5.0 kg / cm 2 and a discharge amount of a coating gun of 50 to 800 g / min and arranging them in layers. is there.

The present invention further provides an automobile or automobile part having a coating film formed by the above method.

Hereinafter, the present invention will be described in more detail.

Metallic base coating layer Metallic base coating material containing a brilliant pigment obtained by pulverizing a vapor-deposited metal film into metal flakes, which is used for forming a metallic base coating film in the method for forming a metallic coating film of the present invention. Contains a brilliant pigment, a solvent, a resin serving as a binder, and a curing agent, which are obtained by pulverizing a deposited metal film into metal fragments.

The brilliant pigment which is obtained by pulverizing the above-deposited metal film into metal flakes is generally formed by depositing a metal film on a base film, peeling the base film, and then pulverizing the deposited metal film to form a metal piece. It is obtained by doing. The thickness of the deposited metal film,
That is, the thickness of the metal piece obtained by pulverization is generally preferably about 100 to 1000 Å,
As for the degree of pulverization, the average particle size is about 5 μm to about 100 μm.
It is preferable that the particles are pulverized so as to be about m.

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

For example, CARL SCHLEN is a glittering pigment obtained by pulverizing a deposited aluminum film into metal flakes.
"DECOMET1001 / 10 (trade name)" manufactured by K Company, "METAL" manufactured by ECKART-WERKE Company
URE55350 (trade name) ". These are supplied in the form of a metal powder paste having a solid content of 10%.

The above-mentioned brilliant pigment is a metal piece having a very small thickness because it is obtained by pulverizing a deposited aluminum film into metal flakes. Accordingly, it is possible to form a metallic base coating film layer which is easily oriented in a planar shape and has a flat surface or a metallic surface gloss such as a metal surface, and can be used as a reflective layer.

[0015] Metal flakes such as flake aluminum powder used in conventional metallic base paints are obtained by grinding metal powder or metal foil with a ball mill or the like. Is thick and has irregularities on the surface, so even if such metal flakes are oriented in a planar shape, the surface does not become flat and is used as a reflective layer having a metallic surface gloss as in the present invention. Can not.

The metallic base paint containing a brilliant pigment which is obtained by pulverizing a deposited metal film used in the method for forming a metallic coating film of the present invention into metal flakes has a pigment concentration (PWC) of the brilliant pigment as high as possible. It is preferably at least 15%, more preferably at least 30%, particularly preferably at least 40%. When a high metallic surface gloss is required, the metallic base paint may be substantially composed of the glitter pigment and a solvent (PWC = 100%). PWC in the above metallic base paint
By increasing the, it is possible to promote the planar orientation of the glitter pigment, eliminate the flaky glitter of the glitter pigment, it is easier to provide a better metal-like surface gloss .

The solvent to be contained in the metallic base paint containing the glittering pigment obtained by pulverizing the deposited metal film used in the present invention into metal fragments is, for example, toluene, xylene, n
Hexane, cyclohexane, methyl acetate, ethyl acetate,
Propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, methanol, ethanol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol,
Isobutyl alcohol, methoxypropanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, propylene glycol monomonoethyl ether acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene Glycol monoethyl ether acetate, Solvesso 100 and Solvesso 1
And hydrocarbon-based solvents such as 50 (trade name, aromatic hydrocarbon solvent manufactured by Esso). These solvents are selected in consideration of the release agent used in the production of the brilliant pigment, the type of the base of the metallic base paint, and the like. 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 a metallic base paint containing a brilliant pigment obtained by pulverizing a deposited metal film used in the present invention to form metal flakes, as described above, it is desirable that components other than the brilliant pigment and the solvent are as small as possible. Preferred, but
If necessary, a film-forming resin or a curing agent can be added.

As the film-forming resin, resins generally used for coatings can be used, and examples thereof include acrylic resins, polyamide resins, urethane resins, polyester resins, and epoxy resins. Examples of the curing agent include amino resins such as melamine resins and benzoguanamine resins, and isocyanates such as isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HMDI) or isocyanurates thereof and blocks thereof. Is mentioned. In addition, as an additive, a silane coupling agent,
It may contain waxes such as polyethylene wax, plasticizers, dispersants, thickeners and the like.

The content of the brilliant pigment, which is obtained by crushing the deposited metal film into a metal flake in the metallic base paint containing the brilliant pigment which is obtained by crushing the deposited metal film used in the present invention to form metal flakes, is particularly limited. Although it is not done, 0.1-3
It is preferably about 0% by weight, more preferably 0.2 to 20%.
% By weight. If the content of the brilliant pigment is too large, atomization at the time of coating is reduced, so that coating unevenness occurs and the appearance deteriorates. Conversely, if the content is too small, the light reflectivity of the reflective layer will decrease.

Coating layer containing beaded glitter material (1) Beaded glitter material In the method for forming a metallic coating film of the present invention, the coating layer containing beaded glitter material comprises a beaded glitter material and a beaded glitter material. And a binder layer used for fixing the polymer.

The above-mentioned beaded glittering material is a bead made of glass or resin, and generally, colorless and transparent beads are used, but colored beads may be used if necessary.

The components constituting the beads preferably exhibit a high refractive index, preferably have a refractive index of 1.8 or more, more preferably 2.0 or more, and particularly preferably 2.1 to 2 It has a refractive index of 0.3. From such a viewpoint, glass beads are preferably used rather than resin beads.

For example, the glass beads may be Ba
O-ZnO-TiO2-based glass, BaO-SiO2-Ti
O2 glass, Na2O-CaO-SiO2 glass, and other components are preferable, and BaO-ZnO-TiO2
System glass and BaO-SiO2-TiO2 system glass are particularly preferable from the viewpoint of the refractive index. By using a beaded glittering material having a high refractive index, the interference effect of light can be enhanced, and interference light can be easily generated in reflected light.

Average particle size (D50) of the above-mentioned beaded glittering material
Is preferably in the range of about 5 to 100 μm,
It is more preferably in the range of 10 to 60 μm, and particularly preferably in the range of 30 to 50 μm. In addition, in order to produce the interference effect in the reflected light more favorably, the particle size distribution of the beaded glittering material is preferably as narrow and sharp as possible, and the particle size distribution in which the particle size of 30 to 60 μm is 80% by weight or more is included. Those are particularly preferably used.

The specific gravity of the beaded glittering material is 0.1.
It is 8-6.0, preferably 1.0-5.0.
Beyond the lower limit, the beaded glittering material is difficult to arrange in layers,
Exceeding the upper limit tends to cause unevenness during painting. The specific gravity when using, for example, resin beads as the bead-like glittering material is 0.8 to 3.5, preferably 1.0 to 2.0.
5 When glass beads are used, the specific gravity is 2.0 to 6.0, preferably 2.5 to 5.0.
It is.

Further, the beaded glittering material is fixed by a binder layer in such a state as to be in contact with a metallic base layer containing a glittering pigment which is obtained by pulverizing the above-described deposited metal film into metal fragments. It is preferable because it easily emits reflected interference light.

(2) Binder Layer In the method for forming a metallic coating film of the present invention, the binder layer used for attaching and fixing the bead-like glittering material comprises a resin and a curing agent generally used as a film-forming resin. Can be contained, for example, as a film-forming resin, acrylic resin, polyamide resin, urethane resin,
A film-forming resin such as a polyester resin and an epoxy resin may be used.

Examples of the curing agent include amino resins such as melamine resins and benzoguanamine resins, isocyanates such as isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HMDI), and isocyanurates thereof. Block bodies and the like can be mentioned.

Further, as additives, waxes such as polyethylene wax, plasticizers, dispersants, thickeners and the like may be contained.

Coloring pigments can be added to the binder paint for forming the binder layer, and examples thereof include organic azochelate pigments, insoluble azo pigments, condensed azo pigments, phthalocyanine pigments, indigo pigments, and perinone pigments. Pigments, perylene pigments, dioxane pigments, quinacridone pigments, isoindolinone pigments, metal complex pigments, and the like.Inorganic pigments include graphite, yellow iron oxide, red iron oxide,
Examples include carbon black and titanium dioxide.

When the above pigment is contained, the total pigment concentration (PWC) in the binder paint is from 0.01 to 2
0%, preferably 0.05% to 15%,
More preferably, it is 0.1% to 10%. If the upper limit is exceeded, the beaded brilliant materials overlap and are fixed, making it difficult to arrange them in a single layer.

Base Coating Layer As the base coating layer, a clear coating or a colored coating is used. By changing the color of the base coating film, the color of the metallic coating film used in the present invention can be adjusted. For example, a gold color can be imparted by using a black coating film as the base coating layer. Further, by using a clear coating film as the base coating film, a silver-based color can be imparted.

The base coating film may be formed from a powder type paint or a solvent type paint.

Clear Coating Layer In the present invention, the clear coating layer is formed on a coating layer containing a beaded glittering material. Generally, the upper surface of the coating layer containing the beaded glittering material is in a state where the beaded glittering material is exposed. Since it has large irregularities, such irregularities are buried, and the surface of the coating film is smoothed by applying the clear layer to prevent the beaded glittering material from falling off.

The clear coating layer can be formed from a transparent clear coating or a turbid clear coating. The transparent clear coating is generally a colorless clear coating, and the turbid clear coating is generally a colored clear coating (also referred to as a color clear coating).

The clear paint may be formed by a powder type paint or a solvent type paint. In order to increase the thickness of the clear coating film, it is preferable to use a powder type paint.

Substrates The method for forming a metallic coating film of the present invention can be used for various substrates, for example, metals, castings, forgings, glass, plastics, foams, etc. , Castings and castings.

Examples of the above metal products include iron, copper,
Aluminum, tin, zinc and the like and alloys containing these metals, castings and forgings, and the like.Specifically, automobile bodies such as passenger cars, trucks, motorcycles, buses, and road wheels made of iron or aluminum die-cast, Examples include resin or metal parts such as wheel covers, bumpers, mirrors, front grilles, emblems, various moldings and door handles. Among these parts, those having a curved surface are particularly outstanding in design effect because of their remarkable interference with reflection. It is particularly preferable that the metal product is subjected to a chemical conversion treatment with a phosphate, a chromate, or the like in advance for rust prevention.

Method for Forming Metallic Coating In the method for forming a metallic coating according to the present invention, a metallic base containing a brilliant pigment formed by pulverizing a vapor-deposited metal film into metal fragments on a base material having a base coating formed thereon. A paint is applied to form a metallic base layer having a plating-like metallic surface gloss.

In order to uniformly fix the beaded glittering material on the coating film, the film thickness is 2 to 30 μm and the viscosity is 2 × 10 ^{4 to} 3
After forming a binder layer of × 10 ⁶ poise, a beaded glittering material-containing coating layer is formed by further coating a beaded glittering material.

Next, after baking it, a clear paint for forming a clear coating film is applied, followed by baking.

In the method for forming a metallic coating film according to the present invention, after the above-mentioned base coating layer is applied, the glittering pigment in the metallic base paint containing the glittering pigment which is obtained by pulverizing the deposited metal film into metal flakes is used. It is preferable to cure the coating layer so that it can be oriented along the surface of the coating layer.

The metallic base coating film containing a brilliant pigment obtained by pulverizing the above-deposited metal film into metal flakes is obtained by arranging the brilliant pigment obtained by pulverizing the deposited metal film into metal flakes in a planar manner. However, it is necessary to volatilize a solvent contained in the coating film and highly shrink the film thickness in order to develop a flat surface or a metal surface gloss such as a metal surface.

The metallic base coating film itself containing a glitter pigment obtained by pulverizing the above-deposited metal film into metal flakes can be cured by heating at a temperature of about 60 to 180 ° C., preferably about 80 to 160 ° C. Heat and cure at a temperature of ° C.

The thickness of the metallic base coating layer containing the brilliant pigment obtained by pulverizing the above-mentioned deposited metal film into metal flakes is preferably 5 μm or less, more preferably 2 μm or less. A coating film formed by a metallic base paint containing a glittering pigment obtained by pulverizing the deposited metal film into metal flakes becomes a coating film having a metal surface gloss such as plating or a metal surface.

As the binder layer used for forming the coating layer containing the above-mentioned beaded glittering material and for attaching the beaded glittering material on the object to be coated, the beaded glittering material is fixed as a single layer film. It is preferable that, as shown in the schematic diagram of FIG. 1, it is attached to the binder as a single layer,
In addition, it is preferable to use a material that can be arranged in a state close to close packing so that there is as little gap as possible and can be fixed uniformly.

First, the thickness of the binder layer after coating is 2 to 30 μm, preferably 5 to 20 μm, and more preferably 5 to 10 μm. If the film thickness is too small, it may not be possible to fix the beaded glittering material in a desired arrangement. On the other hand, if the film thickness is too thick, the beaded glittering materials overlap and are fixed, making it difficult to arrange them in a single layer.

Secondly, the viscosity of the binder layer at the time of applying the binder paint for forming the binder layer and coating the beaded glittering material is in the range of 2 × 10 ^{4 to} 3 × 10 ⁶ poise. And more preferably 1 ×
10 ^{5 to} 2 × 10 ⁶ poise, particularly preferably 2 × 1 poise
0 ⁵ to 1 × 10 ⁶ poise. If the viscosity of the binder layer after coating is too low, the beaded glittering material is fixed by overlapping, and it is difficult to arrange the binder layer in a single layer. If the viscosity of the binder layer after coating is too high, coating may be difficult. For example, the viscosity can be measured by a steady flow measurement method using a conical disk viscometer.

Further, the viscosity of the binder layer can be ensured by heating the coated object to adjust the content of volatile components contained in the binder layer, or conversely, by hot melting. That is, it is important to set the viscosity of the binder layer in the above range at the time of coating and attaching the beaded glittering material.

In the method for forming a metallic coating film of the present invention,
As a method of spraying and adhering the beaded glitter material on the binder layer, a coating method by air spray or electrostatic spray can be mentioned.

In the above coating method, a coating machine provided with a device for supplying a beaded glitter to a coating gun, and a device provided with a coating gun for uniformly applying the beaded glitter on an object to be coated. Is used.

In particular, when using an electrostatic coating machine and an electrostatic coating gun, an air spray type coating is possible when no voltage application is required, and when a charge is required for atomization, an electrostatic spraying method is used. In the method of the present invention, it is preferable to use an electrostatic coating machine and an electrostatic coating gun.

As a coating machine and a coating gun for coating the above-mentioned beaded glittering material, any device provided with a device for stably transporting and supplying the particles of the beaded glittering material to the coating gun tip by at least air can be used. A general powder coating machine and a coating gun can be used. However,
Not only for powder coating, but also if it is equipped with a device that can stably supply beaded glittering material and a device that can atomize beaded glittering material, use it even for air spray coating machines and coating guns. Can be.

For example, a beaded glittering material is supplied to the powder coating machine and the coating gun with an air pressure to the tip of the gun to charge the beaded glittering material between the powder coating gun and the object to be coated. There are two methods, an external charging method, and an internal charging method in which glass beads are charged inside the gun before being blown out from the gun.

In the above-described external charging method, as shown in the schematic diagram of FIG. 2, a high voltage can be applied by a corona pin 8 provided at the tip of the gun, and the generated corona discharge is generated by a bead-like luminous material. (Corona charging method) to form a beaded glittering material layer along the line of electric force toward the article 7 to be coated.

As shown in the schematic diagram of FIG. 3, the internal charging system is charged by friction between the inner wall of the gun and the beaded brilliant material (frictional charging system), and the beaded brilliant material is charged. The thing to apply to a to-be-coated object is mentioned. Furthermore,
An internal corona charging method in which the mechanism of the external charging method is performed inside the gun may be used.

When the beaded glittering material is applied by an external charging method, a high voltage of 0 to -100 KV can be applied, and preferably 0 to -80 KV.
It is. If the upper limit is exceeded, repulsion of the bead-like glittering materials occurs, making it impossible to form a uniform coating film. When the beaded glittering material is applied by an internal charging method (frictional charging), an applied current of 0 to 20 μA can be given.
Preferably it is 0 to 10 μA. If the upper limit is exceeded, repulsion of the bead-like glittering materials occurs, making it impossible to form a uniform coating film.

The supply air pressure for feeding the beaded glitter material to the tip of the gun (the beaded glitter material supply air pressure of the coating machine) needs to be 1.0 to 5.0 kg / cm 2. Pressure (air pressure to adjust the degree of atomization)
It is preferable to use a coating machine and a coating gun which can be adjusted at 0.5 to 3.5 kg / cm2. If the supply air pressure of the beaded glittering material is out of the range, the beaded glittering material cannot be stably conveyed, and a wavy coarse-density occurs. Further, even if the coating pattern adjustment air pressure is out of the range, streaky coating unevenness of the beaded glittering material occurs.

In particular, when glass beads are used as the bead-like glittering material, the specific gravity is large, so that the air pressure for supplying the glass beads to the gun tip (the glass bead supply pressure of the coating machine) is 2.0. K5.0 kg / cm 2, and the coating pattern adjusting air pressure is 1.0、3.0 kg / cm 2.
It is preferably 5 kg / cm2. More preferably, the supply pressure is 2.5 to 4.0 kg / cm2, and the air pressure for adjusting the coating pattern is 1.5 to 2.5 kg / cm2.

The supply pressure when resin beads are used as the bead-like glittering material is preferably 1.0 to 4.0 kg / cm 2, and the coating pattern adjustment air pressure is 0.5 kg / cm 2.
A coating gun that can be adjusted in the range of ~ 3.0 kg / cm2 is preferred. More preferably, the supply pressure is 1.5 to 3.5 kg / cm2.
Is required, and the coating pattern adjustment air pressure is 0.5 ~
2.0 kg / cm2. If the upper limit is exceeded, the particle velocity of the beaded glittering material is too high, causing repulsion from the object to be coated. If the lower limit is exceeded, uniform application cannot be achieved.

The discharge amount of the beaded glitter material at the coating gun tip by the above-mentioned coating machine is preferably from 50 to 800 g / min, more preferably from 100 to 600 g / min, particularly preferably from 100 to 600 g / min. 400 g / min. If it is out of the range, coating unevenness of the beaded glittering material occurs.

The binder layer itself is about 100 to 180
Although it can be heat-cured at a temperature of ° C., in the present invention, a bead-like glittering material-containing coating film is formed in combination with the bead-like glittering material, and simultaneously cured by heating, so that the bead-like glittering material is close to densely packed. It can be arranged in a single layer state, can be arranged near the metallic base layer, and can exhibit an excellent design having reflected interference light.

Further, by applying a clear paint on the bead-like luminous material-containing coating layer, a metallic coating film that emits iridescent interference light can be formed.

The above clear coating is preferably applied by a method such as electrostatic coating or air spraying. The dry thickness of the formed coating film is generally about 30 to 150 μm, more preferably about 50 to 100 μm. It is. If the upper limit is exceeded, problems such as splashes or sagging may occur during coating. If the lower limit is not reached, irregularities on the base cannot be concealed.

The above base coat, metallic base coat,
The thickness of the metallic coating film containing the beaded glittering material-containing coating film and the clear coating film is 50 to 400 μm, and preferably 70 to 300 μm. If it exceeds the upper limit, the physical properties of the film such as a thermal cycle decrease, and if it falls below the lower limit, the strength of the film itself decreases.

[0067]

EXAMPLES The present invention will be described in detail with reference to specific examples, but the present invention is not limited to the following examples. In the following, “parts” means “parts by weight”.

Preparation of Metallic Base Paint A metallic base paint was prepared with the following composition (PWC of aluminum pigment = 40%) as a paint used for forming a metallic base coating film. 5.00 parts of DECOMET 1001/10 (pulverized aluminum pulverized pigment manufactured by CARL SCHLENK, solid content: 10%) 1.05 parts of thermosetting acrylic resin I (manufactured by Nippon Paint Co., hydroxyl value 45, acid value 15, number average molecular weight 21000) , 50% solids) Uban 20N60 0.38 parts (butylated melamine resin manufactured by Mitsui Toatsu Co., 60% solids) 93.57 parts butyl acetate Total 100.00 parts

Preparation of Binder Paint A binder paint having the following composition was prepared as a binder paint for forming a binder layer for fixing the beaded glittering material. 12.0 parts of thermosetting acrylic resin II (manufactured by Nippon Paint Co., Ltd., hydroxyl value 45, acid value 15, number average molecular weight 21,000, weight average molecular weight 61,000, glass transition temperature 29 ° C, solid content 50%) Thermosetting acrylic resin III 2.0 parts (Nippon Paint Co., Ltd., hydroxyl value 95, acid value 22, number average molecular weight 4000, weight average molecular weight 7500, glass transition temperature 10 ° C, solid content 50%) Uban 20N60 1.1 parts (Mitsui East Butyl melamine resin manufactured by Koshasha, solid content 60%) butyl acetate 4.9 parts in total 20.0 parts

Example 1 Formation of Metallic Coating Thickness of 0.8 mm treated with zinc phosphate, length 10 cm × width 30 cm
Powder black paint "Powax A-3"
0 Black (Acrylic resin paint manufactured by Nippon Paint Co., Ltd.)
Was applied by electrostatic spraying so as to have a dry film thickness of 100 μm, and after setting for 10 minutes, baked at 160 ° C. for 20 minutes to complete a base coating film.

The surface of the obtained base coating film was previously coated with methoxypropanol (diluted thinner) for 15 seconds (/ 20 ° C.
4 FordCup) was coated with the metallic base paint of the adjustment example diluted with an air spray so as to have a dry film thickness of 1 μm, and set for 10 minutes.
After baking for a minute, a metallic base coating film was completed.

Next, 1 x in advance with xylene (diluted thinner)
A binder paint for fixing the beaded glitter material diluted to 2 seconds (/ 20 ° C. # 4 FordCup) is spray-coated so that the dry film thickness becomes 10 μm, and after setting for 10 minutes, 4.3 × A wet coating having a viscosity of 10 ⁵ poise was obtained. In addition, the viscosity of the binder coating film is Rheo
Using a sol-G3000 rheometer (manufactured by UBM)
The measurement conditions are as follows: measurement method; steady flow, torque; 2 kg, rotation speed;
0.1 rpm, cone angle; 1.919 (deg), cone diameter;
1.733 (cm) and the measurement temperature were 30 ° C.

On the obtained coating film, “GX325C” manufactured by Nippon Parker Co., Ltd., a coating machine for powder coating, and “GX10” manufactured by Nippon Parker Co., Ltd., a corona charged electrostatic coating gun.
8 "as glass beads (composition: BaO-ZnO-TiO2 glass, refractive index: 2.2, average particle size: about 40 [mu] m, particle size distribution: 53 to 4 wt%; 53 to 38 [mu] m) 82 wt%; 38 μm or less 14 wt%), air pressure 3.0 kg / cm 2 for supply to gun tip, coating pattern adjustment air pressure 2.0 kg
/ cm2, and applied air at a coating voltage of 0 kV. The discharge rate of the beaded glittering material was 180 g / min. After setting for 10 minutes, it was baked at 140 ° C. for 20 minutes to complete a bead-like bright material-containing coating film.

Further, a powder clear coating material “Powax A”
-50 Clear (Acrylic resin paint manufactured by Nippon Paint Co., Ltd.) ", the paint supply air pressure is 3.0 kg / cm2, and the coating pattern adjustment air pressure is 1.
0kg / cm2, painting voltage -80kV electrostatic spray painting,
A metallic coating baked at 160 ° C. for 20 minutes was completed. The discharge rate of the clear paint was 100 g / min.

The powdered clear paint “Powax A-50 Clear (acrylic resin paint manufactured by Nippon Paint Co., Ltd.)” is applied to the atomized state of the beaded glittering material when the above-mentioned beaded glittering material is air-sprayed. It was visually evaluated according to the following criteria in comparison with the state of atomization at the time of the formation.

Visual evaluation 5: The spread of the glittering material is good, and the degree of atomization is considerably excellent. 4: The spread of the glittering material is excellent, and the degree of atomization is excellent. 3: The spread of the glittering material and the degree of atomization are excellent. Normal 2: The spread of the glittering material and the degree of atomization are slightly inferior 1: The spread of the glittering material and the degree of atomization are considerably inferior Further, the design (reflection interference light) and bead shape of the metallic coating film obtained above The unevenness due to the coating of the glitter material was visually evaluated according to the following criteria.

Visual evaluation 5: Very good 4: Excellent 3: Normal 2: Somewhat poor 1: Very poor The above results are shown in Table 1.

Examples 2 to 8, Comparative Example 1 Examples 2 to 3 and 7 to 8 were made of JIS AC4C having a thickness of 10 mm in which the substrate was treated with chromate as shown in Table 1.
Example 4 uses a 1 / 8-cut aluminum wheel part made of JIS AC4CH instead of an aluminum die-cast plate measuring 10 cm in length and 15 cm in width, and sprays a beaded glittering material with the decorative surface on the front side as the target application surface. Table 1 shows the coating conditions
The coating was formed in the same manner as in Example 1 except for the setting. However, in Examples 7 and 8, the "MASAT" manufactured by Matsuo Sangyo Co., Ltd.
Using "SU", coating was performed under the conditions shown in Table 1 for supplying the bead-like glittering material. In Comparative Example 1, a bead-like glittering material was put in a cup, and applied by spraying over the object to be coated, and in the other steps, a coating film was formed in the same manner as in Example 1. Furthermore,
Evaluation was performed in the same manner as in Example 1. Table 1 shows the above evaluation results.
Shown in

[0079]

[Table 1]

As is clear from the results in Table 1, the laminated coating films obtained using the metallic base paints of Examples 1 to 8 according to the present invention were obtained by using a single layer of the beaded glitter material in a close-packed manner. It can be arranged in a close state and can be arranged near the metallic base layer, so-called iridescent,
Different colors were developed depending on the viewing direction, and the flop characteristics could be enhanced with rich interference colors.

[0081]

The metallic coating obtained by the present invention exhibits different colors depending on the viewing direction, and a metallic coating showing iridescent interference light can be stably and industrially formed. .

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a coating film structure of the present invention.

FIG. 2 is a schematic diagram showing a gun tip of an external charging type (corona charging type) coating gun and a state of coating.

FIG. 3 is a schematic view showing a gun tip of an internal charging type (frictional charging type) coating gun and a state of coating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Clear coating film 2 ... Bead-like glitter material 3 ... Binder layer 4 ... Metallic base layer 5 ... Base layer 6 ... Base material 7 ... Coating object 8 ....・ Corona pin 9 ・ ・ ・ Field of electric field 10 ・ ・ ・ High voltage 11 ・ ・ ・ Beaded glittering material with charge 12 ・ ・ ・ Beaded glittering material without charge 13 ・ ・ ・ Air 14 ・ ・ ・ Beaded with positive charge Glitter material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Nakasuji 19-17 Ikedanakacho, Neyagawa-shi, Osaka Inside Nippon Paint Co., Ltd. (72) Koichi Inoue 19-17 Ikedananakacho, Neyagawa-shi, Osaka Nippon Paint (72) Inventor Hideki Ichimura 19-17 Ikedanakacho, Neyagawa-shi, Osaka F-term (reference) in Nippon Paint Co., Ltd. EB35 EB38 EB57 EC11 EC31 EC37 EC45

Claims (5)

[Claims] A metallic coating layer containing a brilliant pigment formed by pulverizing a metal-deposited film into metal flakes on a substrate on which a base coating layer is formed; And a clear coating layer, wherein the coating layer containing the beaded glittering material is 2 × 10 ^{4 to} 3 ×.
After forming a binder layer having a viscosity of 10 ⁶ poise and a film thickness of 2 to 30 μm, a beaded glittering material is applied thereon using a coating machine and a coating gun to supply air pressure of the beaded glittering material. A method for forming a metallic coating film, which is a layer obtained by coating under conditions of 1.0 to 5.0 kg / cm <2> and a discharge amount of a coating gun of 50 to 800 g / min and arranging them in a layered manner. 2. The method for forming a metallic coating film according to claim 1, wherein said glittering pigment obtained by pulverizing said metal-deposited film to form metal flakes is obtained by pulverizing a vapor-deposited aluminum film. 3. The beaded glittering material is a glass bead having a particle size distribution of 30 to 60 μm of 80% by weight or more and a refractive index of 1.8 or more.
The method for forming a metallic coating film according to the above. 4. The method for forming a metallic coating film according to claim 1, wherein the coating machine and the coating gun are an electrostatic coating machine for powder coating and a coating gun for powder coating, respectively. 5. An automobile or automobile part having a coating film formed by the method according to claim 1.