JP3370204B2 - Bright coating film forming method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile,
For industrial painting of cars, home appliances and their parts
Metallic luster and pearl interference color
A bright coating film that can form a harmonious high-grade coating film
It relates to a forming method. 2. Description of the Related Art Glittering coatings for imparting a pearly gloss to coating films
As a raw material, a composition containing an interference mica pigment
Is widely used.
Apply mica-containing paint to the colored base coat surface,
In addition, a 3-coat system that forms a clear coat on the painted surface
It is performed by a method of forming a multilayer coating film. A coating technique using a paint containing interference mica pigments
For example, in the Munsell color chart, N-4
6 to 13% on N-8 color base (resin solids ratio)
Coated with a metal oxide consisting mainly of titanium dioxide
Paint a transparent interference coat containing mica,
Coating method for applying a rear coat (Japanese Patent Laid-Open No. 61-37423)
Gazette) has been proposed. However, as a bright pigment
Excellent glitter when coated with mica only
Cannot be expressed, especially in areas with high brightness.
There is a drawback that only a brilliant glitter can be obtained. For this reason, interference mica pigments and flaky aluminum
A technology has been developed to increase the brilliancy of the formed coating film using
Has been issued. For example, Japanese Patent Laid-Open No. 61-281168
According to the report, the mixing ratio of aluminum pigment to colored mica pigment
Is 1: 1 and the pigment concentration in the paint is 14-20%
Disclosed a light metallic coating of the car body formed by
Japanese Patent Application Laid-Open No. 63-205178 discloses
Interference mica / color mica / cell lightness N1-N6
Aluminum pigment ratio of 5/95 to 95/5 (weight basis
In the case of quasi), the total pigment content in the paint solid content is 0.05 to 5% by weight.
Air atomization of a certain car base paint in two or more stages
A top coating method for automobiles with electrostatic coating has been proposed.
You. Further, Japanese Patent Application Laid-Open No. 63-209772 discloses phosphorous.
50:50 flake aluminum powder pigment and interference mica pigment
-100: 0 (weight ratio) pigment component blended in resin solid
Per 100 parts by weight per 5 to 30 parts by weight
(A), the interference mica pigment was added to 100 parts by weight of the resin solid content.
Paint (b) containing 5 to 30 parts by weight of
Metallic finishing method to apply in order of top coat (c)
Has been described. SUMMARY OF THE INVENTION [0005]
Paints based on phenolic pigments and aluminum flake pigments
Relatively high proportion of aluminum flake pigment
To enhance the metallic shine.
At the same time, it is produced from the gray white color of aluminum flake pigment.
In addition to a strong turbidity, the interference effect of mica pigment is large.
The problem is that it is difficult to obtain an excellent brilliant coating film
is there. Therefore, aluminum flakes against interference mica
Brightness and interference colors due to the composition with a reduced pigment blending ratio
If the effects can be achieved in a well-balanced manner, the ideal brilliant coating film
Become. The present inventors have developed a paint which solves the above problems.
As a result of intensive research on the composition, it became an interference mica pigment.
Average particles in a specific range as aluminum flake pigment to be used in combination
Size, average particle thickness and narrow particle size distribution
If you select a powder with excellent brilliant properties at once,
Alumi-Furek pigment arrangements for counter-interfering mica pigments.
Low total pigment component based on mixing ratio and paint solids
Excellent interference color effect by mica pigment in specific compounding area
The brilliancy of the aluminum flake pigment is balanced while retaining the fruit
It was confirmed that a well-harmonized coating film was formed. The present invention has been developed based on such knowledge.
The purpose is to dry with mica pigment.
Balancing effect and brightness of aluminum flake pigment
Well expressed and high saturation in harmony with the color tone of the colored underlayer
Of glittering coatings that can form high quality coatings
Is to provide a law. [0008] To achieve the above object,
The method for forming a glittering coating film according to the present invention includes the following (1) to
The sequential formation of the coating film forming step (3)
What you do. (1) colored undercoating film forming step (2) average particle diameter D ₅₀ Is 15 to 35 μm, and the average particle thickness is
0.5-1.5 μm, slope in rosin-Rammler diagram
Aluminum flake pigment with an arrangement of 2.5 or more and interference mica face
Weight ratio of aluminum flake pigment / interference mica
A glitter pigment component having a ratio of 1/4 to 1/20
0.1 to 6 parts by weight per 100 parts by weight of solid film-forming resin
Glitter coating type to apply the glitter coating film containing paint
Formation step (3) Clear coating film formation step. The substrate to be coated on which the coating film of the present invention is formed is
Steel, aluminum, copper or their alloys
Metal, glass, cement, concrete
Inorganic materials such as polyethylene, polypropylene,
Tylene-vinyl acetate copolymer, polyamide, polyacryl
, Polyester, ethylene-polyvinyl alcohol
Polymer, vinyl chloride resin, vinylidene chloride resin, polycarbonate
-Resin molded products such as carbonate and polyurethane and various F
Plastic materials such as RP, wood, fiber materials, etc.
I can do it. Apply an appropriate undercoat or pre-coat
Performing the coating process is optional. For these substrates to be coated
The following colored undercoating film forming step, glittering coating film forming step
And a clear coating film forming step are sequentially performed. In addition,
Coating can be performed directly on the substrate to be coated,
In car coating, etc., electrodeposition coating is usually performed after surface conversion treatment.
After applying undercoating with paint, etc., and the coating film is cured,
Paint. (1) Step of forming a colored undercoating film;
This is a step of applying a color intermediate coating to the substrate to be coated. Mosquito
Pigments used in color coatings are commonly used for general coatings
Organic and inorganic coloring pigments and extender pigments
Can be used. Coloring pigments include, for example, organic
Zorake pigment, phthalocyanine pigment, indigo face
Pigment, perinone pigment, perylene pigment, insoluble azo face
Pigment, condensed azo pigment, phthalocyanine pigment, indigo
Pigments, perinone pigments, perylene pigments, dioxadi
Pigment, quinacridone pigment, isoindolinone face
Pigments, metal complex pigments, etc.
Ngara, carbon black, titanium dioxide, etc.
And the extender pigments include calcium carbonate,
Examples include barium sulfate, clay, and talc. Behi
Acrylic resin, polyester resin
Thermosetting properties of fats, alkyd resins and modified resins
Amino resin or (block) polyisocyanate resin
A resin system mixed with a crosslinking agent such as a compound is used. this
In addition, a two-pack type that can be cured by drying at room temperature
Use of urethane resin or silicone resin
it can. [0011] The method of applying the colored base is air spray coating.
Atomizing type coating method such as coating and electrostatic coating or roll coater
Dry coating method is applied, and the dry coating is 25-50 μm.
Or 30 to 40 μm. (2) Bright coating film formation step; Bright coating film formation
The paint used in the process is made up of aluminum flake pigment and interference mask.
A bright pigment component containing squid pigment is added to the vehicle.
The composition is Of these, aluminum flake pigments
The average particle diameter D ₅₀ Is 15 to 35 μm, average particle thickness
0.5 to 1.5 μm in rosin-Rammler diagram
Those having a particle property with a gradient n of 2.5 or more are selective
Used for Average particle size D ₅₀ Is a laser diffraction type grain
50% value of the particle size distribution measured by a particle size distribution measuring device
is there. The average particle thickness (μm) is [4000 / water-coated surface
Product (cm ^Two / g)] formula, and how to measure
The method is, for example, "Aluminum Handbook" (1972
9th edition, published on 15th, Japan Light Metal Association; Asakura Shoten)
Page 1243. Rosin-Lamura
ー (Rosin-Rammler) diagram is [R = 100exp (−bD
ⁿ )] (Where R is the cumulative weight from the maximum particle size to the particle size D)
%, D is the particle size, b and n are constants)
Refers to a particle size diagram showing the degree distribution, and the gradient n is the particle size diagram
The cumulative weight% from the maximum particle size to the particle size D in
Means the n value of the rosin-Rammler equation represented by a straight line
I do. The specific measurement method is laser diffraction type particle size distribution measurement.
The particle size distribution is determined using a
The product distribution is plotted on a rosin-Rammler diagram and the straight line
And translate an extrapolation line from the pole (Pol P) to n
Ask. Average particle size D of aluminum flake pigment ₅₀ Is 1
If it is less than 5 μm, the particles become too fine and the glitter is sufficiently
No longer appear, and if it exceeds 35 μm, the orientation of particles is disturbed.
Protruding from the coating surface due to overlapping, resulting in poor appearance
Become like Particle average thickness in the range of 0.5 to 1.5 μm
Is relatively thicker than conventional aluminum flake pigments,
It is difficult to deform and has excellent surface smoothness.
When diffused, diffuse reflection is suppressed and the function to enhance glitter is performed.
The average thickness of the particles is less than 0.5 μm
In the case of, it is impossible to increase the glitter,
If it exceeds m, it will protrude due to poor orientation of aluminum flake pigment
As a result, poor appearance of the coating film occurs. Rosin-Rammler diagram slope
Particles with a distribution n of 2.5 or more are particles of aluminum flake pigment.
Characterized by a narrow degree distribution, particles with uniform particle size
To enhance the glitter by suppressing diffuse reflection based on fine particles
In particular, coarse particles are also reduced, and a good coating appearance is formed.
Sir. When the gradient n is less than 2.5, the particle size distribution is broad.
And the fine-grained particles enhance the gray-white characteristic of aluminum flakes
Lowers glitter, gives a sense of turbidity, and reduces depth
Invite. More preferred particle properties of aluminum flake pigment
Is the average particle diameter D ₅₀ Is 20-30 μm and the average particle thickness is
0.5-1.5 μm, slope in rosin-Rammler diagram
The arrangement n is in the range of 2.5 to 3.5. Aluminum flake face having the above-mentioned particle properties
The material is selected in advance by, for example, primary classification of the particle size.
Atomized aluminum spherical powder, crushing aid, fat
Grinding media consisting of aliphatic or aromatic hydrocarbon solvents
Wet crushing with a crusher in the presence of
Classify with a filter press
Can be obtained. Particle shape is not macroscopically circular
It has a flattened, rounded shape and is
It has very few uneven surface sections. On the other hand, as interference mica pigments, natural white
Titanium dioxide, iron oxide, and other
Thin metal oxides such as ROM, cobalt, tin, and zirconium
Pearl Mai coated with a film to give an interference color effect
A pigment having a particle size range of 1 to 60 μm, preferably
1 ~ 40μm, scale like 15 ~ 25μm average particle size
Particles are used. The paint for forming a glittering coating film is the above-mentioned aluminum
Brightness prepared by blending flake pigment and interference mica pigment
It is formed by mixing a reactive pigment component with a resin for forming a coating film.
Acrylic resin, polyester
Resin, alkyd resin, fluorocarbon resin
And at least one selected from modified resins thereof.
Kind of thermosetting resin, amino resin and / or
G) mixed with a crosslinking agent such as a polyisocyanate compound
Is used. These resins are not limited to one type but two types
These can be used in combination. other than this,
Two-component polyurethane resin or silicone curable by drying at room temperature
A cone resin or the like may be used. In preparing the coating, aluminum flakes
Pigment / interference mica pigment weight ratio of 1/4 to 1/20, preferably
More preferably, it is blended in the range of 1/8 to 1/15.
A glittering pigment component, and the glittering pigment component is a film-forming resin
0.1 to 6% by weight per 100 parts by weight of solids, preferably
Must be mixed at a ratio of 0.5 to 5 parts by weight.
Matter. Aluminum flake pigments for interference mica pigments
Aluminum flour if the compounding ratio exceeds 1/4 (weight ratio)
Mica interference color disappears
For example, it becomes grayish white and becomes a paint color with a high sense of turbidity.
When it falls below, the metallic glitter decreases and it shines
Glow disappears. Also, brilliant pigments for resin solids
If the content of the components is less than 0.1 part by weight, the appearance of brilliancy is not exhibited.
When the amount exceeds 6 parts by weight, the concealing property increases and
The hue of the color undercoat film cannot be used. Other additives may be added to the paint for forming a bright coating film.
Curing agent such as dodecylbenzenesulfonic acid
Catalyst, benzotriazole-based UV absorber, benzof
Phenolic antioxidants, such as silicones and organic polymers
Surface conditioner, anti-sagging agent, thickener, anti-settling agent, crosslinkability
Polymer particles (microgels) and the like are appropriately used. This
These components are usually added to 100 parts by weight of the resin for forming a coating film.
Improve the performance of paints and coatings with less than 5 parts by weight
be able to. For forming a brilliant coating film comprising the above component composition
Paints are generally of the organic solvent type, but are not limited to this
Non-aqueous dispersion type, aqueous solution type, aqueous dispersion type, etc.
The paint can be configured as a seed form. When painting
Diluted with a solvent such as an organic solvent or water to a coating-appropriate viscosity.
Used, but the solid content during production is 30-70% by weight,
Is preferably 10 to 50% by weight. The formation of the brilliant coating film is achieved by curing the colored undercoat film.
After that, there is an atomization type coating method similar to the application method of the colored base
Or by a roll coater type coating method, and a dry coating film of 10
Paint to a thickness of ~ 25μm. Film thickness less than 10 μm
In this case, the base concealing property is reduced, causing color unevenness. (3) Clear coating film forming step;
Topcoat with clear coating film forming paint
And paint. As a clear coating film forming paint,
Transparent resin commonly used for is used, but if necessary
Color pigments and various additives as long as the transparency is not impaired.
May be combined. Formation of clear coating film
Coating for forming a clear coating on the glitter coating applied in the process
Is applied and cured simultaneously by two coats and one bake method.
It is preferable to carry out the method. However, two coats two
It can be done by the work method. Chestnuts forming
The preferred dry film thickness of the coated film is in the range of 30 to 60 μm.
It is. According to the glittering coating film forming method of the present invention, the base
In the glittering coating film forming process,
Uses a paint composition containing miflake pigment and interference mica pigment
Aluminum fringe for interference mica pigments
Pigment components that are relatively low in pigment and occupy in paint
In a composition with a small amount, the glitter and the interference color
It is possible to express a high-quality color that harmonizes well with the lance.
You. This unique effect is mainly due to the aluminum particle
Pigment composition using selected black pigment and interference mica pigment
Brought by. That is, aluminum flake pigment
Average particle diameter D ₅₀ The particle size range of
Suppresses the phenomenon of particles protruding from the surface to achieve good coating appearance
As well as giving a strong glitter,
Aluminum flakes in the range of 0.5 to 1.5 μm
Is relatively thicker than aluminum flake pigments
Hard and excellent surface smoothness, enhances the glitter of the coating film
To work. Furthermore, the gradient of the rosin-Rammler diagram
The narrow particle size distribution where n is 2.5 or more indicates that the particle size is uniform in the coating film.
Dispersed as fine particles, suppressing irregular reflection based on fine particles.
To increase the glitter and reduce
It effectively contributes to forming the appearance of the coating film. [0023] Such aluminum flake pigments are provided with glitter.
Based on the action, the compounding ratio to the interference mica pigment was 1 /
4 to 1/20 (weight ratio), due to interference mica pigment
Film that shows sufficient glitter while maintaining the interference color effect
Can be formed. Therefore, a large amount of aluminum frame
There is no turbidity due to the gray white color that occurs when compounding pigments
Glitter, depth and pearly balun
It can be formed as a well-harmonic coating film. Ma
In addition, the total pigment component was also 0.1 to 100 parts by weight of the resin solid content.
Since it can be reduced to 1 to 6 parts by weight,
High-quality vividness that always reproduces the hue of the colored base moderately
Kana color tone is developed. Examples Example 1 (1) Paint for forming colored undercoating film; manufactured by Nippon Paint Co., Ltd.
"Olga S-90 Sealer White" with Munsell display
Toning so that the lightness of the coating film becomes N8, forming a colored undercoat film
Paint was prepared. (2) Brilliant coating film forming paint; acrylic resin (styrene /
Methyl methacrylate / ethyl acrylate / hydro
Copolymerization of xyethyl methacrylate / methacrylic acid
Body, number average molecular weight about 20,000, hydroxyl value 45, acid value 15, solid content
50%) 80 solid parts by weight and melamine resin [trade name "Uva
20SE "manufactured by Mitsui Toatsu Chemicals, Inc., solid content 60%] 20 solids
100 parts by weight of the film-forming resin mixed with 100 parts by weight
And the average particle diameter D ₅₀ Is 20 μm and the average particle thickness is 0.7
μm, aluminum having a gradient n of 3.0 in the rosin-Rammler diagram
0.28 solid parts by weight of flake pigment and blue interference mica
Pigment [“Exterior Marlin Super Blue” Marl
2.22 solid parts by weight, and the brilliant pigment component
With an organic solvent (toluene / xylene / ethyl acetate / butyl acetate)
(Chill = 70/15/10/5) with dissolver and paintability
Stir and mix to achieve a pearl metallic light
A paint for forming a bright coating film was prepared. Aluminum flex in this case
The weight ratio of black pigment / interfered mica pigment is 1/8. (3) Clear coating film forming paint; acrylic / melamine resin
Clear paint [“Super Rack O-100” Nippon Pain
G. Co., Ltd.] was used. (4) Coating film forming step; chemical conversion treatment with zinc phosphate
0.8mm thick dull steel base material with cationic electrodeposition paint
[Nippon Paint Co., Ltd., "Power Top U-50"]
After coating so that the dry coating film becomes 25 μm,
For 30 minutes. This electrodeposition coating surface has a colored undercoat coating
Air spray the paint for application so that the dry film thickness is 40 μm.
-Painted and baked at 140 ° C for 30 minutes, shining on its surface
The dry coating film becomes 16 ~ 20μm
I painted it. Coating is electrostatic coating machine [Randsberg Gemma Co., Ltd.
Pressure, 2.8 kg / cm using Auto REA] ^Two Done and painted
The atmosphere in the booth is kept at 25 ° C and 75% humidity.
Was. After setting for 3 minutes after painting, clear
Coating the paint for forming the coating so that the dry film thickness is about 35 μm
did. Then I set it at room temperature for about 10 minutes
And baked at 140 ° C. for 30 minutes. (5) Evaluation of physical properties of coating film; formed in this way
The CIE (L ^* a
^* b ^* ) Optical measurement of hue in color system, reflection characteristics (light
(Brightness) and the appearance of the coating film were evaluated, and the results are shown in Table 1.
Was. Reflection characteristics (root mean square): Microscopic gloss meter [Suga Test Machine
From the perpendicular of the painted surface.
Irradiation at an incident angle of 0 ° and a light receiving angle of 20 ° from the opposite direction
Set to receive light with a measurement width of 20 mm and 0.2 mm
The reflection characteristics were recorded at pitch intervals of. 0.2mm
Move to 3.8mm by Tep, total 20 reflection characteristics
Was measured. Data processing of each reflection characteristic waveform (JIS
B0601), and the intensity of glitter is calculated as the root mean square (Rq)
, An average value of 20 pieces was obtained. The root mean square (Rq) is
The higher the value, the larger the amplitude of the reflection characteristic waveform and the higher the glitter.
To indicate that Hue: Deflection spectrophotometer [Murakami Color Research Laboratory, GCMS-3
Mold, D65 light source, 2 degree field of view], and paint as shown in FIG.
Light source at an angle of 45 ° from the perpendicular to the film-formed measurement sample
And illuminates the light source side from the opposite direction of the illumination angle to the light source side.
° (light receiving point H in the highlight direction) and 110 ° (
At the angle of the light receiving point S) in the card direction. this
Lightness-Saturation L ^* a ^* b ^* Measures color with color system and lightness
(L ^* ) And saturation (C ^* ) Was measured. Note that C
^* H ｛(a ^* ) ^Two + (B ^* ) ^Two ｝ ^1/2 Was calculated. Appearance of coating film (visual judgment):
To evaluate the brightness and appearance of the coating film. Luminance ◎… Luminance is very strong… Luminance is strong △… Luminance is slightly recognized ×… Luminance is low and turbidity is low ○… None ×… There is white blur ○… None ×… △ や や あ り あ り × な し な し な し 実 施 ２ ２ ２ ２ ２ ２ ２ ２ ２ ２ ２ ２ Example 2
A colored undercoating film was formed, and all others were the same as in Example 1.
A coating film was formed by a coating process and a coating process. Formed
Table 2 shows the results of the physical property evaluation of the coated film in the same manner as in Example 1.
1 Example 3 Aluminum flake pigment constituting a paint for forming a brilliant coating film
The compounding amount was 0.17 solid parts by weight, and the interference mica pigment
Add 2.33 solids by weight (aluminum flake pigment / dried)
Weight ratio of mica pigment = 1/14)
Paint film by the same paint and coating process as in Example 1.
Formed. Regarding the formed coating film, the same as in Example 1
The results of the evaluation are shown in Table 1. Example 4 The Munsell lightness N2.5 was changed by changing the toning of the colored base paint.
A colored undercoat film was formed, and all others were the same as in Example 3.
A coating film was formed from the paint and the coating process. Formed
Table 2 shows the results of the physical property evaluation of the coated film in the same manner as in Example 1.
1 Example 5 Aluminum Flake Pigment Constituting a Paint for Forming a Bright Coating Film
With the average particle diameter D ₅₀ Is 30 μm and the average particle thickness is 1.0
μm, rosin-Rammler diagram with a gradient n of 2.6
In the shape of the interference mica pigment, gold interference mica pigment
["Iriodin 300WII" (Merck Japan)]
In place of 2.33 parts by weight of solid, all others were the same as in Example 1.
A coating film was formed by one coating and coating process. Formation
Results of physical properties evaluation of the coated film in the same manner as in Example 1.
Are shown in Table 2. Example 6 The toning of the colored base paint was changed to obtain a Munsell lightness N2.5.
A colored undercoating film was formed, and all others were the same as in Example 5.
A coating film was formed by a coating process and a coating process. Formed
Table 2 shows the results of the physical property evaluation of the coated film in the same manner as in Example 1.
2 Example 7 Colored base coat of Munsell hue indication 4.5Y6.7 / 1.5
A film is formed, and all other components are the same as in Example 5
A coating film was formed by a coating process. About the formed coating film
Table 2 shows the results of the physical property evaluation performed in the same manner as in Example 1.
Was. Example 8 The aluminum flake pigment constituting the paint for forming a bright coating film
The compounding amount was 0.17 solid parts by weight, and the interference mica pigment
Add 2.33 solids by weight (aluminum flake pigment / dried)
Weight ratio of mica pigment = 1/14)
The same paint and coating process as in Example 7
Formed. Regarding the formed coating film, the same as in Example 1
The results of the sex evaluation are also shown in Table 2. Comparative Example 1 Aluminum flake pigment constituting a paint for forming a brilliant coating film
The compounding amount was 0.83 solid parts by weight, and the interference mica pigment
Add 1.67 solid parts by weight (aluminum flake pigment / dried
Weight ratio of mica pigment = 1/2), all others
Form a coating film by the same paint and coating process as in Example 1.
Done. The physical properties of the formed coating film were the same as in Example 1.
Table 3 shows the results of the evaluation. Comparative Example 2 The Munsell lightness N2.5
A colored base coat was formed, and all others were the same as Comparative Example 1.
A coating film was formed by a coating process and a coating process. Formed
Table 2 shows the results of the physical property evaluation of the coated film in the same manner as in Example 1.
3 Comparative Example 3 Aluminum flake pigment constituting a paint for forming a bright coating film
The compounding amount is 0.97 solid parts by weight, and the interference mica pigment is
The compounding amount was 7.73 solid parts by weight (aluminum flake pigment / dried
Weight ratio of mica pigment = 1/8), all others
Form a coating film by the same paint and coating process as in Example 1.
Done. In this example, the vehicle of the bright coating film forming paint
Blending of brilliant pigment component to 100 parts by weight of resin solids
The amount amounts to 8.7 parts by weight. Implement for the formed coating film
Table 3 also shows the results of the physical property evaluation performed in the same manner as in Example 1. Comparative Example 4 The aluminum flake pigment constituting the paint for forming a bright coating film
The compounding amount is 0.97 solid parts by weight, and the interference mica pigment is
The compounding amount was 7.73 solid parts by weight (aluminum flake pigment / dried
Weight ratio of mica pigment = 1/8), all others
Form the coating film by the same paint and coating process as in Example 2.
Done. In this example, the vehicle of the bright coating film forming paint
Blending of brilliant pigment component to 100 parts by weight of resin solids
The amount amounts to 8.7 parts by weight. Implement for the formed coating film
Table 3 also shows the results of the physical property evaluation performed in the same manner as in Example 1. Comparative Example 5 Aluminum Flake Pigment Constituting a Paint for Forming a Bright Coating Film
With the average particle diameter D ₅₀ Is 17 μm and the average particle thickness is 0.3
μm, rosin-Rammler diagram with a gradient n of 2.3
In all other respects, the same paint as in Example 1 was used.
A coating film was formed by the coating process. Formed coating film
Table 4 shows the results of the physical property evaluation of
did. Comparative Example 6 Aluminum Flake Pigment Constituting a Paint for Forming a Bright Coating Film
With the average particle diameter D ₅₀ Is 17 μm and the average particle thickness is 0.3
μm, rosin-Rammler diagram with a gradient n of 2.3
In all other respects, the same paint as in Example 2 was used.
A coating film was formed by the coating process. Formed coating film
Table 4 shows the results of the evaluation of the physical properties in the same manner as in Example 1.
Posted. Comparative Example 7 Aluminum Flake Pigment Constituting a Paint for Forming a Bright Coating Film
With the average particle diameter D ₅₀ Is 13 μm and the average particle thickness is 0.3
μm, particle size of the rosin-Rammler diagram with a gradient n of 2.7
In all other respects, the same paint as in Example 5 was used.
A coating film was formed by the coating process. Formed coating film
Table 4 shows the results of the evaluation of the physical properties in the same manner as in Example 1.
Posted. Comparative Example 8 Aluminum Flake Pigment Constituting a Paint for Forming a Bright Coating Film
With the average particle diameter D ₅₀ Is 13 μm and the average particle thickness is 0.3
μm, particle size of the rosin-Rammler diagram with a gradient n of 2.7
In all other respects, the same paint as in Example 6 was used.
A coating film was formed by the coating process. Formed coating film
Table 4 shows the results of the evaluation of the physical properties in the same manner as in Example 1.
Posted. Comparative Example 9 An interference mica face was used as a pigment component in a paint for forming a bright coating film.
2.5 solid parts by weight only (aluminum flake face
No blending of ingredients). Everything else is the same paint as in Example 1.
A coating film is formed by the coating process, and the formed coating film is
Table 5 shows the results of evaluation of physical properties in the same manner as in Example 1. Comparative Example 10 An interference mica face was used as a pigment component in a paint for forming a bright coating film.
2.5 solid parts by weight only (aluminum flake face
No blending of ingredients). Everything else is the same paint as in Example 2.
A coating film is formed by the coating process, and the formed coating film is
Table 5 also shows the results of the physical property evaluation performed in the same manner as in Example 1. [Table 1] [Table Notes] (1) Reflection characteristics are root mean square values (the same applies hereinafter). (2) S in the hue indicates a shade and H indicates a highlight (the same applies hereinafter). [Table 2] [Table Note] *: The interference mica pigment was changed to 2.33 solid parts by weight for "Iliodin 300WII". [Table 3] [Table 4] [Table 5] From the results of Tables 1 to 5, the condition of the present invention was satisfied.
The coating film formed by each of the Examples
Brightness is developed, and the saturation (C
^* ) Is high, there is no feeling of turbidity or white blur, and colored base
Vivid pearl media with a sense of depth reflecting the color tone of the coating film
It was recognized that it had a taric tone. Against this
And the blending ratio or blending amount of aluminum flake pigment is large
In Comparative Examples 1 to 4, although the brilliancy was high, the feeling of bottom turbidity and white spots
Inferior feeling of depth or depth, particle properties of aluminum flake pigment
In Comparative Examples 5 to 8 in which the state deviates from the requirements of the present invention, sufficient brightness was obtained.
No feeling is expressed. Also contains aluminum flake pigment
In Comparative Examples 9 and 10 in which glitter is not performed,
I understand. The preferred embodiment of the present invention including the above-described embodiment
The embodiments are as follows. (1) Aluminum flake pigment blended with interference mica pigment
Uniform particle diameter D ₅₀ Is a glittering coating in the range of 20 to 30 μm.
Film formation method. (2) Aluminum flake pigment blended with interference mica pigment
The slope n in the Jin Lamlar diagram is 2.5 to 3.5.
The method for forming a glittering coating film within the range. (3) Average particle size D ₅₀ Is 20 to 30 μm, and the average particle thickness is
0.5-1.5 μm, gradient in Rosin-Rammler diagram
Interfering mica with aluminum flake pigment having n of 2.5 to 3.5
Glitter that is used in pigments to prepare glitter coatings
Coating method. (4) Mixing ratio of aluminum flake pigment / interfering mica pigment
Is 1/8 to 1/15 (weight ratio)
Method. (5) Brightness composed of aluminum flake pigment and interference mica pigment
The reactive pigment component per 100 wt.
Prepare a paint for forming bright coating film by mixing 0.5 to 5 parts by weight
Brilliant coating film forming method. (6) The vehicle resin for forming the glittering coating film is made of acrylic resin
Fat, polyester resin, alkyd resin, fluororesin,
Selected from polycarbonate resins and their modified resins
A crosslinking agent is mixed with at least one thermosetting resin obtained.
A method for forming a glittering coating film. As described above, according to the present invention, the colored base
Relatively few aluminum flake pigments with specific particle properties on the coating surface
Light blended in vehicle with interference mica pigment in the range of quantity
Apply a shiny pearl metallic paint and clear
By applying the coating in order, the interference color effect is maintained.
In a state where the high luminosity is well-balanced and
Form a high-grade coating film with excellent saturation that vividly reflects the color tone
It becomes possible. Therefore, a new color that has never existed
High-grade paint color is required because it can express the area
High quality for various substrates to be coated, including exterior coating of automobile bodies
Extremely useful for the purpose of forming a high quality glitter coating.
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a method for measuring reflection characteristics in an example.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-281168 (JP, A) JP-A-63-209772 (JP, A) JP-A-3-66744 (JP, A) (58) Investigation Field (Int. Cl. ⁷ , DB name) B05D 5/06 101 C09D 5/38

Claims (1)

(57) [Claims] (1) A method for forming a glittering coating film, comprising sequentially performing the following coating film forming steps (1) to (3). (1) Step of forming a colored undercoating film (2) Aluminum flake having an average particle diameter D50 of ₁₅ to 35 μm, an average particle thickness of 0.5 to 1.5 μm, and a gradient n in a rosin-Rammler diagram of 2.5 or more A brilliant pigment component comprising a pigment and an interference mica pigment and having a weight ratio of aluminum flake pigment / interference mica in the range of 1/4 to 1/20; A glittering coating film forming step of applying a glittering coating film forming paint contained in parts by weight (3) a clear coating film forming step.