JP2001104871A - Method of forming brilliant coating film and road wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a brilliant coating film to provided a brilliant coating film capable of forming a smooth coating film excellent in coating film appearance on a base material for road wheel capable of exhibiting morpho tone in the view point of design and having coarse surface roughness, and to provide the road wheel obtained by the method. SOLUTION: In this brilliant coating film forming method, (1) a primer coating film layer formed of a powder paint, (2) a color base coating film layer, (3) a brilliant multiple fiber-containing clear coating film layer having an alternate layer structure, which is composed of at least two or more kinds of polymer components having high optical interference effect and (4) a clear top coating film layer 4 are successively formed on the surface of the base material for road wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

[0002] The present invention relates to a method for forming a brilliant coating film and a road wheel coated by the method. More specifically, the present invention relates to a method for forming a glittering coating film capable of providing a coating film exhibiting a glittering feeling similar to the coloring of morpho butterfly wings (hereinafter, referred to as a morphological feeling), and a road wheel coated by this method.

[0003]

2. Description of the Related Art Steel wheels and aluminum wheels (alloys) are used as automobile wheels as mounting members for tires and other automobile parts.
Aluminum road wheels with excellent design and anticorrosion properties are frequently used. For example, Japanese Patent Application Laid-Open No. 3-114574 describes a method of applying a metallic finish to an aluminum road wheel. However, a design different from the conventional ones is further required. On the other hand, JP-A-11-18
No. 26, No. 11-1827, No. 11-182
JP-A Nos. 8 and 11-1829 describe a brilliant fiber having an optical interference effect having a specific structure in a composite fiber having an alternate layered structure composed of at least two or more types of polymer components. .

[0004]

Problems to be Solved by the Invention
JP-A-11-1827, JP-A-11-1828 and JP-A-11-1829 disclose the use of glittering fibers as a coating material and the application to road wheel base materials having a rough surface roughness. There is no description. Therefore, the problem to be solved by the present invention is to use a glittering composite fiber having a high optical interference effect on a design surface and having an alternate layered structure composed of at least two or more polymer components as a coating material, When applied to an object to be coated such as a base material for a road wheel having a rough surface, a good appearance, a glittering coating film forming method for providing a glittering coating film exhibiting a morpho feeling with a deep feeling, and An object of the present invention is to provide a road wheel coated by the glittering coating film forming method.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above-mentioned problems, and as a result, have reached the present invention. 1. On the base material for road wheels, the following (1) to (4)
A method for forming a glittering coating film by sequentially forming a coating film layer. (1) a primer coating layer formed from a powder coating,
(2) a color-based coating layer, and (3) a clear coating layer containing a brilliant composite fiber (hereinafter also referred to as a brilliant fiber) having an alternating layered structure composed of at least two or more polymer components having a high optical interference effect. (Hereinafter referred to as a bright fiber-containing clear coating layer), (4) a clear top coating layer. The following (1) to (4-)
A glittering coating film in which a coating layer of 2) is sequentially formed, and two coating layers of the following (3) and the coating layer of (4-1) are formed by wet-on-wet. Forming method. (1) a primer coating layer formed from a powder coating,
(2) a color base coating layer, (3) the bright fiber-containing clear coating layer, (4-1) a first clear top coating layer, and (4-2) a second clear top coating layer. A glittering coating film forming method, wherein the color base coating film layer is formed from an aluminum flake pigment-containing coating material. 4. A method for forming a glittering coating film, wherein the color base coating film layer is formed from a coloring pigment-containing paint. 5. A road wheel obtained by the above glittering coating film forming method.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail.
I do.Bright coating film forming method  The first method for forming a glittering coating film according to the present invention includes a road wheel
Primer formed from (1) powder coating on base material
-Coating layer, (2) color base coating layer, (3) glittering fiber
Weir-containing clear coating layer, (4) clear top coating layer
This is a glittering coating film forming method for sequentially forming.

A second method of forming a glittering coating film according to the present invention comprises: (1) a primer coating layer formed from a powder coating; (2) a color base coating layer;
(3) Bright fiber-containing clear coating layer, (4-1) First
A clear top coat layer and a (4-2) second clear top coat layer are sequentially formed. Of these coat layers, the (3) bright fiber-containing clear coat layer and the (4-1) This is a glittering coating film forming method in which two layers, one clear top coating film layer, are formed on a wet-on-wet basis.

The wet-on-wet method is a method in which a base coat is applied, dried by air drying or the like, and applied to an uncured or semi-cured base coat layer, which will be described later. The wet-on-dry method is a method in which a base coat layer is baked and cured to coat the base coat layer.

[0009]Base material  As the base material, iron, aluminum, magnesium,
Automobiles processed from metals such as titanium or their alloys
For road wheels, which are members for mounting tires such as
It is a substrate. In the glitter coating film forming method of the present invention,
A primer coating layer composed of a powder coating is directly applied to the base material.
To be formed, but beforehand the base material is subjected to degreasing or chemical conversion treatment.
It is preferable to perform ground treatment.

[0010]Formation of primer coating layer  Primer coating layer in glittering coating forming method of the present invention
As epoxy resin, polyester resin, acrylic
Film-forming resin such as resin, cross-linking agent, and face
Ingredients, curing catalyst, surface conditioner, and other additives
Formed by powder coating obtained by kneading, crushing and classifying
Primer coating layer, which may hide the underlayer
It does not have to be hidden.

The epoxy resin preferably has two or more oxirane groups in the molecule. Specifically, for example, glycidyl ester resins, glycidyl ether resins such as condensation products of bisphenol A and epichlorohydrin, alicyclic epoxy resins, linear aliphatic epoxy resins, brominated epoxy resins, phenol novolaks Epoxy resin, cresol novolak epoxy resin, and the like. Examples of the bisphenol-type epoxy resin include, for example, Epicoat 828, Epicoat 1001, Epicoat 1004, Epicoat 100
7, Epicoat 1009 (all manufactured by Shell Chemical Co., Ltd.) and the like, and those obtained by chain-extending these with an appropriate chain extender can also be used. Examples of the epoxy resin curing agent include an epoxy resin having a phenolic hydroxyl group, an amine-based curing agent, dicyandiamide, imidazoles, and imidazolines. As the acrylic resin and the polyester resin, those described in the section for forming the color base coating layer can be used.

The dry film thickness of the primer coating layer is preferably from 30 to 2 from the viewpoint of coating smoothness, corrosion resistance and chipping resistance.
The thickness is preferably 00 µm, and if it is out of this range, it is difficult to exhibit the above-mentioned properties, and more preferably, it is 50 to 150 µm.
By using a powder coating for the formation of the primer layer, it covers the roughness of the road wheel base material with a rough surface roughness,
The coating film can be smoothed. The coating of the powder coating can be performed by an electrostatic coating method using a known electrostatic coating machine or the like.

[0013]Formation of color base coating layer  Color base coating film used in the glittering coating film forming method of the present invention
The layer is wet-on-wet on top of the primer coating layer.
Layer formed by the wet method or the wet-on-dry method
Consists of a film-forming resin and, if necessary, a crosslinking agent
Disperse vehicle and glitter pigment and / or color pigment
It may be formed by a solvent type paint obtained by
Powder type obtained by kneading, pulverizing and classifying these components
It may be formed by a paint. As a solvent type paint, one component
Paint may be used, or two-pack urethane resin paint etc.
Such a two-component resin may be used. In addition to the above components, curing
A catalyst, a surface conditioner, and other additives may be blended.
Strongly expresses the morpho feeling of the clear coating layer containing brilliant fibers
To achieve this, the color base coating layer must be
It is preferable that the lightness N in the indicating system is 4 or less. Yo
More preferably, the lightness N is 1 or less. This color base
The coating film layer needs to cover the base.

In the color base paint used for forming the color base coating layer in the glittering coating film forming method of the present invention, (a) an acrylic resin, (b) a polyester resin, and (c) an alkyd resin,
(D) a fluorine resin, (e) an epoxy resin, (f) a polyurethane resin, (g) a polyether resin, and the like. These can be used alone or in combination of two or more, and preferably acrylic. Resin and polyester resin. Examples of the acrylic resin (a) include a copolymer of an acrylic monomer and another ethylenically unsaturated monomer. Acrylic monomers that can be used in this copolymer include acrylic acid or methacrylic acid methyl, ethyl, propyl, n-butyl, i-butyl, t-butyl, 2-ethylhexyl, lauryl, phenyl, benzyl, 2-hydroxy Esterified products such as ethyl and 2-hydroxypropyl, ring-opened adducts of caprolactone of acrylic acid or 2-hydroxyethyl methacrylate, glycidyl methacrylate, acrylamide, methacrylamide and N-methylolacrylamide, polyhydric alcohol (meth) ) Acrylic esters and the like. Other ethylenically unsaturated monomers copolymerizable therewith include styrene, α-methylstyrene, itaconic acid, maleic acid, vinyl acetate and the like.

Examples of the polyester resin (b) include saturated polyester resins and unsaturated polyester resins. Examples thereof include condensates obtained by heat-condensing a polybasic acid and a polyhydric alcohol. Examples of the polybasic acid include saturated polybasic acids and unsaturated polybasic acids.Examples of the saturated polybasic acids include phthalic anhydride, terephthalic acid, and succinic acid. For example,
Maleic acid, maleic anhydride, fumaric acid and the like can be mentioned. Examples of the polyhydric alcohol include dihydric alcohols and trihydric alcohols, and examples of the dihydric alcohol include ethylene glycol and diethylene glycol. Examples of the trihydric alcohol include:
Glycerin, trimethylolpropane and the like can be mentioned.
The resin for forming a coating film includes a curable type and a lacquer type, but a type having a curable type is usually used.

In the case of a type having curability, amino resins, (block) polyisocyanate compounds, amines, polyamides, imidazoles, imidazolines,
It is used after being mixed with a crosslinking agent such as a polyvalent carboxylic acid, and the curing reaction can proceed at heating or at room temperature. It is also possible to use a lacquer type coating film forming resin having no curability together with a curable type.

When the above-mentioned vehicle contains a crosslinking agent, the ratio of the resin for forming a coating film to the crosslinking agent is 90 to 50% by weight and the content of the crosslinking agent is 10 to 50% by weight in terms of solid content. Preferably, the coating film forming resin is 85 to 60% by weight, and the crosslinking agent is 15 to 40% by weight. If the crosslinking agent is less than 10% by weight (the resin for forming a coating film exceeds 90% by weight), the crosslinking in the coating film is not sufficient. On the other hand, when the cross-linking agent exceeds 50% by weight (the resin for forming a coating film is 50% by weight)
), The storage stability of the coating composition is reduced and the curing speed is increased, so that the appearance of the coating film is reduced.

In the above color base paint, as a glitter pigment, conventionally used as a paint, for example,
Aluminum flake pigment, colored aluminum flake pigment, alumina flake pigment, graphite pigment, mica pigment, metal titanium flake, stainless flake, plate-like iron oxide, phthalocyanine flake or metal-plated glass flake can be contained in an optional amount. . In particular, by forming a color base coating layer mainly composed of aluminum flake pigments or colored aluminum flake pigments, the metallic luster of aluminum flakes and the morpho-feel of the brilliant fibers contained in the brilliant fiber-containing clear coating layer are combined. Unique shine.

In the above color base paint, the content of the brilliant pigment (the weight ratio of the solid content of the pigment to 100 parts by weight of the paint solid content: PWC) is preferably set to less than 25%, more preferably less than 20%. If it exceeds 25%, the appearance of the coating film deteriorates.

Further, the color base paint can contain a color pigment. As such pigments, those conventionally used for paints are conventionally used.Examples of organic pigments include azo lake pigments, phthalocyanine pigments, indigo pigments, perylene pigments, quinophthalone pigments, and dioxazine pigments. Pigments, quinacridone-based pigments, isoindolinone-based pigments, metal complex pigments, and the like, and examples of inorganic pigments include, for example, graphite, yellow iron oxide, red iron oxide, titanium dioxide, and carbon black. In particular, by forming a color base coating layer mainly composed of primary color pigments such as green, yellow, blue or red under the bright fiber-containing clear coating layer, these bright color pigments and bright fibers can be used. A unique brilliant feeling combined with a morpho feeling is obtained. The content (PWC) when a color pigment is included is preferably set to less than 25%, more preferably less than 20%. If it exceeds 25%, the appearance of the coating film deteriorates. The total pigment content (P
WC) is preferably less than 50%, more preferably less than 30%. If it exceeds 50%, the appearance of the coating film deteriorates. Various extender pigments such as talc, calcium carbonate, precipitated barium sulfate, and silica can be used in combination.

In addition to the above-mentioned components, the color base coating material comprises a polyamide wax which is a lubricating dispersion of an aliphatic amide, a polyethylene wax which is a colloidal dispersion mainly composed of polyethylene oxide, an anti-settling agent, a curing catalyst, an ultraviolet absorbing agent. Agents, antioxidants, leveling agents, surface conditioners such as silicone and organic polymers, anti-sagging agents, thickeners, defoamers, lubricants, cross-linkable polymer particles (microgels), etc., appropriately added and contained. be able to. The performance of paints and coatings can be improved by blending these additives in a proportion of, for example, 15 parts by weight or less with respect to 100 parts by weight of the vehicle (based on solid content).

When the color base paint is of a solvent type, the above components are usually provided in a form dissolved or dispersed in a solvent. Any solvent may be used as long as it dissolves or disperses the vehicle, and an organic solvent and / or water may be used. Examples of the organic solvent include those commonly used in the field of coatings. Examples thereof include hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ether ketone, esters such as ethyl acetate, cellosolve acetate, and butyl cellosolve, and alcohols. When the use of an organic solvent is regulated from the viewpoint of the environment, it is preferable to use water. In this case, an appropriate amount of a hydrophilic organic solvent may be contained.

The dry film thickness of the color base coating layer is 1
The thickness is preferably from 0 to 100 μm, and if it is less than 10 μm, it is difficult to hide the base, and if it exceeds 100 μm, the appearance of the coating film may be deteriorated. More preferably, it is 20 to 50 μm.

[0024]Formation of clear coating layer containing bright fibers  The glitter fiber-containing coating in the glitter coating film forming method of the present invention.
The rear coating layer is formed on the color base coating layer by a web.
By wet-on-dry method or wet-on-dry method
Brilliant fiber and, if necessary, the brilliant pigment and / or
Or it is formed by a clear paint containing a color pigment.
You.

The bright fiber-containing clear coating layer may be formed by a solvent type paint or a powder type 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. As the vehicle, the brilliant pigment, the coloring pigment and other components contained in the clear coating containing the brilliant fiber, the same ones as those used in the color base coating layer can be used.

The dry film thickness of the bright fiber-containing clear coating layer is preferably from 10 to 100 μm. If it is less than 10 μm, the morpho feeling cannot be sufficiently exhibited, and if it exceeds 100 μm, the appearance of the coating film may be deteriorated. More preferably, it is 15 to 30 μm.

[0027]Brilliant fiber  Brightness contained in the bright fiber-containing clear coating layer
Fibers are colored by light reflection, interference, diffraction or scattering
At least two or more polymers having optical functions
It is a fiber with an alternating multilayer structure composed of components.
Has a high refractive index difference between each polymer constituting
By obtaining a chemical interference effect, a morpho feeling is exhibited.
In order to obtain this morpho feeling efficiently,
Fibers are multi-layered and have fibers whose interfaces are all substantially parallel.
Preferably, multilayer alternate lamination is formed in the short axis direction of the flat fibers.
The higher the aspect ratio, the more effective the surface for light interference
The product can be large. The flattening ratio of this flattened fiber is
When the aspect ratio is less than 2, high optical dryness is preferred.
It is difficult to obtain the interference effect, while the flat fiber exceeds 15
May greatly reduce the spinnability. More preferably
It is 3.5-10, More preferably, it is 3.5-7.

When these glittering fibers form a multilayer laminated structure, their thickness is adjusted to an optically effective thickness of 0.0
It is necessary to control the thickness to 2 to 0.3 μm, and for that purpose, thinning is performed by high-speed spinning or drawing. In the alternating multilayer, the thickness of each component layer is preferably 0.02 to 0.3 μm. If the thickness is outside this range, the expected interference effect cannot be obtained. Further, the thickness is more preferably 0.05 to 0.15 μm. Also, the optical distance of the two components,
That is, when the product of the thickness of the layer and the refractive index is equal, a higher interference effect can be obtained.

The glitter fiber is preferably obtained from a crystalline polymer having a high refractive index and a low refractive index. As the crystalline polymer having a fiber forming property having a high refractive index, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalene, etc. Aromatic polyesters such as phthalate are preferred, and polyethylene naphthalate in which a dibasic acid component having a sulfonic acid metal base is copolymerized at a certain ratio is particularly preferred. The refractive index of these polymers is, for example, 1.64 (calculated value 1.58) for polyethylene terephthalate and 1.63 for polyethylene naphthalate.
(Calculated value), 1.55 for polybutylene terephthalate
(Calculated value). Examples of the low refractive index polymer include methacrylates such as polymethyl methacrylate, polyvinyl ethers, polyolefins such as polyethylene and polypropylene, and aliphatic polyamides. Examples of the aliphatic polyamide include nylon 6, nylon 66, nylon 612, nylon 11 and nylon 12, and particularly nylon 6 and nylon 6.
6 is preferred.

The brilliant fiber can be produced by a known method for producing a conjugate fiber. For example, after passing a two-component polymer through a static mixer provided with an arbitrary number of elements in a spin pack,
It is obtained by guiding and discharging the composite flow through the flow dividing plate of the mouthpiece introduction hole. As a static mixer, a number of mixers are connected to create a multilayer-joined composite polymer stream, and furthermore, an annular slit discharge hole, a circular slit discharge hole,
A multilayer hollow fiber can be obtained by discharging from a flat slit hole having a joining direction as a long axis, a flat slit hole having a joining direction as a short axis, or a flat C-shaped slit hole.

The glitter fibers can be cut into chips of any size and added to the paint according to the purpose of use. The size is 20 ~ 1000μ depending on the application
m is preferable. From the appearance of the coating, 50-300 μm
Is preferred.

The glitter fiber content (PWC) in the glitter paint-containing clear coating composition used for forming the glitter fiber-containing clear coating layer is 0.5 to 30%.
Is preferable, and 1 to 15% is more preferable. If it is less than 0.5%, the morpho-feel is reduced, and if it exceeds 30%, the flowability of the coating film is reduced, and the appearance of the coating film may be reduced.

[0033]Formation of clear top coat layer  In the first invention of the present invention, a clear fiber-containing clear material is provided.
-After forming a coating layer, a clear top coating layer
To form In this case, the clear top coat layer is
It is a coating film layer that does not contain bright fibers. Contains the above glittering fibers
Form a clear top coat layer on top of the clear coat layer
This improves gloss and prevents protrusion of glittering fibers.
Can be As this clear top coat layer,
A clear and colorless clear coating film can be used.
Using a so-called turbid clear coating film with a translucency
You may. Used for forming the clear top coat layer
As a clear paint, it is commonly used as a top coat.
The above-mentioned thermosetting resin can be used.
And a cross-linking agent can be used. the above
The dry film thickness of the clear top coat layer is 30 to 400 μm
If the ratio is outside the above range, the appearance of the coating film may deteriorate.
There is. More preferably, it is 50 to 200 μm.

In the second aspect of the present invention, the primer coating layer formed from the above (1) powder coating,
(2) a color base coating layer, (3) a bright fiber-containing clear coating layer, (4-1) a first clear top coating layer,
(4-2) A coating layer of a second clear top coat layer is sequentially formed, and the glitter fiber-containing clear coat layer and the first clear top coat layer of these coat layers are wet-on-wet. Formed. According to this method, a glittering coating film having a high smoothness and a sense of depth can be obtained. in this case,
As the clear paint for the first clear top coat layer formed by wet-on-wet, it is preferable to apply the resin system used for the bright fiber-containing clear coat layer in order to improve the appearance of the coat. The clear paint used for forming the second clear top coat layer is not particularly limited. When the glitter fiber-containing clear coating layer and the first clear top coating layer are formed by wet-on-wet, the first clear top coating layer and the second clear top coating layer are preferably 20 to 100 μm. If the ratio is out of this range, the appearance of the coating film may be deteriorated.

The clear topcoat used in the first and second methods may be, if necessary, a color pigment, an extender, a modifier, an ultraviolet absorber, a leveling agent, a dispersant as long as the transparency is not impaired. And additives such as an antifoaming agent. Further, the clear top coating may be a solvent type coating or a powder type coating. 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.

The method of forming each of the above-mentioned coating layers is not particularly limited. However, when a powder coating is applied by a spray method, a roll coater method or the like, electrostatic coating is preferable. The drying is performed at a temperature of 80 to 160 ° C. for a predetermined time, whereby a coating film can be obtained.

[0037]Road wheel  The road wheel, which is the painted product of the present invention, is characterized in that
Primer formed from powder coating by film forming method
Coating layer, color base coating layer, clear fiber-containing clear
A multi-layer coating consisting of a coating layer and a clear top coating layer
It was formed. In the second method, the clear
-There are two overcoat layers. This multi-layer coating film
The resulting road wheel is smooth and has good appearance
have. This coating film has a bright fiber containing
For composite color of rear coating layer and lower color base coating layer
And the glittering fiber itself protrudes.
Instead, it has a brilliant feeling with a deep feeling.

[0038]

EXAMPLES Next, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. In addition, the compounding amount represents a weight part unless there is particular notice.

[0039]Examples 1 to 12, Comparative Examples 1 to 3 Preparation of bright fiber clear paint  Acrylic resin (styrene / methyl methacrylate / ethyl
Methacrylate / hydroxyethyl methacrylate /
Methacrylic acid copolymer, number average molecular weight about 20,000,
(Hydroxyl value 45, acid value 15, solid content 50% by weight)
Min resin (trade name: "Uban 20SE", Mitsui Chemicals, Inc.)
(Manufactured by Corporation, solid content 60% by weight)
The glitter fiber A was added to the vehicle obtained by blending at a weight ratio.
(Average particle size 100 μm, manufactured by Teijin Limited), brilliant fiber
B (average particle size: 70 μm, manufactured by Teijin Limited) is shown in Table 1.
It was blended in proportions. Next, an organic solvent (toluene / xylene
Weight ratio of ethyl acetate / ethyl acetate / butyl acetate = 70/15/1
0/5) with a stirrer so that the paint has the proper viscosity.
To prepare a brilliant fiber coating. But compare
Examples are indicated by C in Table 1 in place of the bright fibers.
Interference mica pigment (Iriodin 225WII, Merck)
Was used.

[0040]Base material  Chromate treatment for aluminum alloy (AC4C) wheels
(Product name: "Al Surf 1000", Nippon Paint Co., Ltd.
The product was processed using

[0041]Formation of primer coating layer  Powder clear paint (trade name: "Powax H-250"
Clear ", manufactured by Nippon Paint Co., Ltd.)
coated on the above substrate to a thickness of μm and at 160 ° C for 20 minutes
Baking to form a primer coating layer,
did. As a comparative example, a solvent type clear paint (trade name:
"Super Rack M-90 Clear", Nippon Paint Co., Ltd.
Is coated on the above substrate so that the dry film thickness becomes 50 μm.
And baked at 140 ° C. for 20 minutes as base material B
Was.

[0042]Formation of color base coating layer  Color base paint B1 (trade name: "Super Rack 50
00 black ", Nippon Paint Co., Ltd.), color base paint B2
(Product name: "Super Rack 5000 Yellow", Japan
Paint Co.) and color base paint B3 (trade name:
"Super Rack M-90 Silver Metallic", Japan
Paint Co.) has a dry film thickness of 30 μm.
Spray coating on the substrate A or B
For 20 minutes to form a color base coating layer.
The Munsell display system for these color base coating layers
The brightness in B1 is N1, B2 is N3, B3 is N2
there were.

[0043]Glow fiber-containing clear coating layer and clear
Formation of coating layer  The base material on which the color base coating layer is formed is coated with a glittering fiber.
Apply clear paint containing fiber to a dry film thickness of 30 μm.
To form a brilliant fiber-containing clear coating layer.
Under the following baking conditions or wet-on-wet,
Using clear paint, the clear top coat layer is solvent-based
For dry coating, dry film thickness 50μm, powder type clear coating
Was applied so as to have a dry film thickness of 100 μm. However
Examples 5, 6, 7, 10, and 12 contain glittering fibers.
Form a clear coating film layer with wet-on-wet
Using the clear paint below, the first clear top coat layer
Is applied to a dry film thickness of 50 μm, and the second clear
Apply the top coat layer to a dry film thickness of 50 μm.
Was. The baking conditions were the temperatures shown in Table 1 and the time was 20 minutes.
Was. The morphology and appearance of the obtained coating film are shown below.
It was evaluated by the evaluation method. The results are shown in Table 1. 3A: Solvent type acrylic resin clear paint (trade name:
"Super Rack 5000AW-10 Clear", Japan
3B: Powder type acrylic resin clear paint (trade name: manufactured by Paint Co., Ltd.)
"Powax A-400 Clear", Nippon Paint Co., Ltd.
Manufactured).

[0044]Evaluation method  Brightness similar to the color of morpho butterfly feathers as morpho feeling
Whether or not the feeling was recognized was visually evaluated. 5: The above-mentioned morpho feeling is remarkably recognized and there is also a sense of depth. 4 ... The above-mentioned morpho feeling is remarkably recognized. 3 .... The above-mentioned morpho feeling is recognized. None Appearance of coating film ... Evaluate the finished condition of the formed coating film visually
Valued. 5: A smooth coating film was formed, and there was no problem in appearance.
Level 3: Less smooth than Level 4, but no problem in appearance
Level 2: Poor appearance of bright fibers, poor appearance such as wrinkles, etc.
Poor appearance

[0045]

[Table 1]

As is clear from the results shown in Table 1, Example 1
In Nos. To 12, an aluminum wheel having a good appearance of a coating film and exhibiting a brilliant feeling having a morpho feeling is obtained by the coating film forming method of the present invention. On the other hand, in Comparative Examples 1 and 2, since the white mica pigment was used instead of the brilliant fiber, the brilliant feeling having a morpho feeling was not exhibited. In Comparative Example 3, since the solvent-based paint was used as the primer, the roughness of the base material of the aluminum wheel was not concealed, and the appearance of the coating film was not good.

[0047]

According to the present invention, it is possible to form a coating film having a good appearance and a deep morpho feeling on a road wheel. In the glittering film forming method of the present invention, by using a powder coating material as a primer, it is possible to cover the roughness of a road wheel base material having a rough surface roughness, and further, a glittering fiber-containing clear coating film By forming the layer and the clear top coat layer in a wet-on-wet manner, it was possible to exhibit a morpho feeling with higher smoothness and a deeper feeling. In particular, by forming a color base coating layer mainly composed of an aluminum flake pigment or a colored aluminum flake pigment, a unique brilliant feeling in which the metallic luster of the aluminum flakes and the morpho feeling of the brilliant fibers are combined can be obtained. In addition, by forming a color base coating layer mainly composed of primary color pigments such as green, yellow, blue or red, a unique combination of the color development of these bright color pigments and the morpho-feel of glittering fibers Brightness can be obtained.

Continued on the front page (72) Inventor Masahiko Yamanaka 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Nobuhiko 4-1-1-15 Minamishinagawa, Shinagawa-ku, Tokyo Japan Paint Co., Ltd. 72) Inventor Takashi Moritabu 4-1-1, Minamishinagawa, Shinagawa-ku, Tokyo F-term in Japan Paint Co., Ltd. (reference) 4D075 AE10 CB04 CB11 CB13 CB36 DA23 DB07 DC13 EA02 EA41 EA43 EC02 EC11 EC23

Claims (5)

[Claims] (1) On a road wheel substrate, the following (1)
The glittering coating film forming method of sequentially forming the coating layers of (4) to (4). (1) a primer coating layer formed from a powder coating,
(2) a color-based coating layer, (3) a bright composite fiber-containing clear coating layer having an alternating layer structure composed of at least two or more polymer components having a high optical interference effect,
(4) Clear top coat layer 2. The following (1) is provided on a base material for a road wheel.
To (4-2) are sequentially formed, and of these coating layers, the following two coating layers (3) and (4-1) are formed by wet-on-wet. Bright coating film forming method. (1) a primer coating layer formed from a powder coating,
(2) a color-based coating layer, (3) a bright composite fiber-containing clear coating layer having an alternating layer structure composed of at least two or more polymer components having a high optical interference effect,
(4-1) First clear top coat layer, (4-2) Second coat
Clear top coat layer 3. The color base coating layer according to claim 1, wherein the color base coating layer is formed from a paint containing an aluminum flake pigment.
The method for forming a glittering coating film according to the above. 4. The method according to claim 1, wherein the color base coating layer is formed from a coloring pigment-containing coating. 5. A road wheel obtained by the method for forming a glittering coating film according to claim 1.