JPH07303857A - Depth improving coating - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a coating film that is a single layer and has an excellent depth and depth feeling. [Constitution] The Munsell value (V) is set to 0 to 6, and the area ratio of the bright pigment or the area ratio and the particle size distribution range are specified, and the area of the bright pigment in each area is divided in order of area. To be included in a specific range from the average value, or the area ratio of the bright pigment contained in each divided area is represented by Log (logarithm) on the vertical axis,
By adjusting the slope of the regression line with respect to each point on the graph in which the horizontal axis is arranged in the order of area, the target coating film having a feeling of depth is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-layer coating film having an excellent depth and depth feeling, and is particularly effective for high-quality painting finish of automobile outer panels.

[0002]

2. Description of the Related Art Munsell value (V) is 0
By applying a metallic paint containing a tabular mica-like iron oxide pigment to the colored coating films Nos. 6 to 6, it is possible to obtain a multi-layer coating film having a three-dimensional effect with a glittering feeling under the direct sun. It is already known (for example, JP-A-1-254279). However, since the colored coating film and the metallic coating film have a multi-layer structure, the coating process is complicated, and since the clear coating film containing no coloring pigment contains the bright pigment, the feeling of depth is not sufficient. Have defects.

Particularly, in a high-class passenger car, there is a strong demand for finishing a coating film having a good feeling of depth and a feeling of depth, and the above conventional method is not sufficient.

The object of the present invention is to form a coating film which is a single layer and has an excellent depth and depth feeling. As a result, the Munsell value (V) is 0 to 6 and the area of the luster pigment is large. Ratio or area ratio and particle size distribution range are specified, and the area of the bright pigment in each area obtained by dividing the area in order is included within the specified range from the average value, or each divided area The object can be achieved by adjusting the slope of the regression line with respect to each point of the graph in which the vertical axis indicates the area ratio of the bright pigment contained in the graph (Log) and the horizontal axis indicates the area. And completed the present invention.

That is, the present invention provides the following depth feeling improving coating film.

(1) Including a bright pigment and a coloring pigment,
Munsell value (V) is in the range of 0 to 6, a single layer coating film having a feeling of depth.

(2) Including a bright pigment and a coloring pigment,
The Munsell value (V) is in the range of 0 to 6, and the particle size distribution of the bright pigment is included in each divided area obtained by uniformly dividing the particle diameter distribution of each of the bright pigments in the order of area. The area ratio of the total area of the bright pigment to a predetermined range is calculated, and the difference (maximum deviation) between the average value of the area ratios in all the divided areas and the area ratio in each of the divided areas is 0.89.
% Or less, a single-layer coating film having a feeling of depth.

(3) Including a bright pigment and a coloring pigment,
The Munsell value (V) is in the range of 0 to 6, and the area ratio of the bright pigment on the coated surface is 0.1 to 20.
%, And the area for a predetermined range of the total area of the bright pigment contained in each divided area obtained by equally dividing the particle size distribution of the bright pigment in the order of the areas of the individual bright pigments. The ratio is calculated, and the difference (maximum deviation) between the average value of the area ratios in all the divided areas and the area ratio in each of the divided areas is 0.89% or less. Layer coating.

(4) Including a bright pigment and a coloring pigment,
The Munsell value (V) is in the range of 0 to 6, and the area ratio of the bright pigment on the coated surface is 0.1 to 20.
%, And the particle size distribution range of the bright pigment is 1 on average.
The area ratio of the total area of the bright pigment contained in each divided area obtained by equally dividing the area of each of the bright pigments in the order of 140 μm to a predetermined range is calculated. The difference (maximum deviation) between the average value of the area ratio in each area and the area ratio in each of the divided areas is 0.89.
% Or less, a single-layer coating film having a feeling of depth.

(5) Including a bright pigment and a coloring pigment,
The Munsell value (V) is within the range of 0 to 6, and the Munsell value (V) is included in each of the divided areas obtained by equally dividing the particle size distribution range of the bright pigment in the order of the area of each of the bright pigments. The area ratio of the total area of the luster pigment to a predetermined range is calculated, and the vertical axis represents the Log (logarithmic) area ratio, and the horizontal axis represents the area of the luster pigment in the order of the divided areas. The slope of the regression line is -4.92 x 10 ^-5
A single-layer coating film having a feeling of depth, which is (1 / μm ² ) or more.

(6) Including a bright pigment and a coloring pigment,
The Munsell value (V) is in the range of 0 to 6, and the area ratio of the bright pigment on the coated surface is 0.1 to 20.
%, And with respect to a predetermined range of the total area of the bright pigments contained in each divided area obtained by equally dividing the particle size distribution range of the bright pigment in the order of the area of each of the bright pigments. The area ratio is calculated, and the vertical axis is Log (logarithm)
The slope of the regression line with respect to each point of the graph obtained by sequentially arranging the area ratio and the abscissa on the abscissa from the divided areas in the order of area of the bright pigment is −4.92 × 10 ⁻⁵ (1 / μm ² ) or more. A single-layer coating with a characteristic depth.

(7) Including a bright pigment and a coloring pigment,
The Munsell value (V) is in the range of 0 to 6, and the area ratio of the bright pigment on the coated surface is 0.1 to 20.
%, And the particle size distribution range of the bright pigment is 1 on average.
At 140 μm, the area ratio of the total area of the bright pigment contained in each divided area obtained by equally dividing the area of the individual bright pigment into a predetermined range is calculated. Log (logarithm) area ratio, the slope of the regression line with respect to each point of the graph in which the abscissa is arranged in order from the divided areas of the bright pigment in the order of area is -4.92 × 10 ^-5 (1
/ Μm ² ) or more, a single-layer coating film having a feeling of depth.

(8) A multilayer coating film obtained by forming a clear coating film on the coating film surface according to any one of claims 1 to 7.

The single-layer coating film of the above (1) to (7) of the present invention is a liquid obtained by dissolving or dispersing a bright pigment, a coloring pigment and a resin composition in a solvent (organic solvent and / or water). It is formed by applying paint to the object to be coated,
As the bright pigment, it is necessary to use the above-mentioned specific one.

The glittering pigment is a metallic pigment having a glittering sensation and exhibiting a particularly remarkable brilliance in sunlight, and specific examples thereof include mica-like iron oxide (MIO) and thick-walled aluminum. can give.

In the single-layer coating films (1) to (4) of the present invention, it is particularly preferable that the bright pigment satisfies all of the following conditions (a) to (c).

(B) The area ratio on the formed coated surface is 0.1 to 10.
20%. When the area ratio is less than 0.1%, the feeling of brilliance decreases, while when it exceeds 20%, the feeling of depth decreases, and it is difficult to achieve the object of the present invention.

The area ratio is the area ratio of the visible pigment which occupies a predetermined range of the formed cured coating film surface or the formed coating surface, and which is sunk in the single-layer coating film and is invisible. No pigment is included. Here, the area ratio is obtained by the following method.

The "predetermined range" is the coated surface (width 32 mm x 2
6 mm) image area (number of pixels 512 x 480)
That is.

The coating film is irradiated with light from a light source and is received at an angle at which specular reflection light is not incident, and a predetermined range of the coating film is binarized into a high-luminance portion and a low-luminance portion according to luminance, and the low-luminance portion. The number ni of dots for each area Si of the island-shaped high-intensity part surrounded by is calculated, and the total area of this high-intensity part (Si × n
i) / The area ratio is calculated by the area in a predetermined range.

A specific example of an apparatus for measuring the area of the bright pigment in the coating film is shown in FIG. The coated plate 1 having a coating film is placed at an angle θ with respect to the horizontal plane, and the light source 2 irradiates the coated plate 1 with pseudo sunlight 4 from the vertical direction. This light source 2 is a solar simulator and emits light that is almost the same as sunlight. CCD to receive light at an angle where specular reflection does not enter
A camera (television camera) 3 is arranged. The CCD camera 3 is located at a position where the specularly reflected light of the light 4 emitted from the light source 2 on the coating surface is not received. The CCD camera 3
The image photographed by is divided into the above pixels, and the brightness of each pixel is converted into a binary value of 0 (low brightness part) and 1 (high brightness part), and is input to the frame memory and stored. The binarized data stored in the frame memory is converted into corresponding electric signals, input to a computer, the area of each high-intensity part and the number thereof, and the total area of the high-intensity part based on a predetermined range (reference range). The area ratio of the high-luminance portion in the area) is calculated.

For example, the artificial sunlight 4 from the light source 2 is applied to the coated plate 1.
32m of the coating film surface by CCD camera 3 while irradiating
F number 16 and focal length 50mm in the range of mx 26mm
Photograph with 0.4 times magnification with the lens. Angle θ is 2
It can be changed from 0 to 35 °. The captured image is divided into 512 × 480 pixels and processed by a computer, and the brightness of each pixel is divided into a binary value of a high brightness part (1) and a low brightness part (0) and surrounded by (0). The area consisting of only islands (1) was examined, and the number of pixels in (1) in that area was 1 pixel, and the imaging area was 3.4722 × 10 ³ μm.
^The product of ² is the area of the dots, that is, the individual area Si of the bright pigment. Then, the number ni of dots was obtained for each area Si, a histogram of the area was created, Si × ni was calculated for each area Si, and the area ratio was calculated by dividing by the area A in a predetermined range.

(B) The average particle size distribution range is 1 to 140 μm.
To be. Outside this range, the object of the present invention is difficult to achieve. The particle size range can be measured by a method known per se.

(C) The area ratio of the total area of the bright pigments contained in each divided area obtained by uniformly dividing the bright pigment in the order of the area of the respective bright pigments to a predetermined range. Is calculated, and the difference between the average value of the area ratios in all the divided areas and the area ratio in each of the divided areas is 0.
89% or less. That is, the glitter pigment is divided into a plurality (preferably 3 or more) in the order of the area of each glitter pigment. Next, the total area ratio of the bright pigment in each of the divided areas is obtained as described above.
Then, the average value of the area ratios of the bright pigments in the respective areas thus obtained is calculated, and the difference between the average value and the area ratio of the bright pigments in the respective areas is included in 0.89% or less. It is necessary. When the difference between this average value and the area of the bright pigment in each area is larger than 0.89%, the feeling of depth and the feeling of depth are reduced, and the object of the present invention is difficult to achieve.

The method for preparing the metallic pigment satisfying the conditions (a) to (c) can be carried out, for example, depending on the synthesizing condition of these pigments and the spreading condition thereof.

It is particularly preferable that the bright pigment used in the single-layer coating film of (5) to (7) has the above-mentioned conditions (a) and (b) and the following condition (d).

(D) An area ratio of a total area of the bright pigments within a predetermined range to a predetermined range is calculated by dividing the bright pigment into a plurality of evenly divided areas of the respective bright pigments. The ordinate represents the log (logarithmic) area ratio, and the abscissa represents the slope of the regression line with respect to each point of the graph, which is arranged in order from the divided areas in the order of the area of the bright pigment.
^{Must be} 10 ⁻⁵ (1 / μm ² ) or more.

The area ratio of the total area of the bright pigment contained in each divided area to a predetermined range is the same as described in (a) above, "the total area of the bright pigment in each area. Is measured and divided by a predetermined range. Then, the vertical axis is the Log (logarithmic) area ratio, the horizontal axis is sequentially arranged from the divided areas in the order of the area of the bright pigment, and the slope of the regression line for each point of the graph obtained by plotting the respective area ratios is obtained. But-
It must be 4.92 × 10 ⁻⁵ (1 / μm ² ) or more. This inclination is −4.92 × 10 ⁻⁵ (1 / μm ² ).
When it is smaller, the depth and depth of the coating film deteriorate, which is not preferable.

The single-layer coating film of the present invention contains the bright pigment as described above.
It is formed by applying a liquid paint which is mixed and dispersed with a color pigment, a resin composition and a solvent (organic solvent and / or water).

The color pigment is used for adjusting the Munsell value (V) of the formed coating film within the range of 0 to 6. The Munsell value (V) is the lightness of the three color components (lightness, hue, and saturation). If the Munsell value (V) is larger than 6, it is not preferable because it is too bright and the feeling of depth and depth due to the bright pigment cannot be sufficiently expressed. As the pigment, known pigments can be used, and the brightness can be adjusted by the kind, ratio and blending amount of these.

The resin composition is preferably a thermosetting resin composition which is a main component for forming the single-layer coating film and can form a coating film excellent in finish appearance and durability. A thermosetting resin composition comprising a base resin such as an acrylic resin, a polyester resin or an alkyd resin and a cross-linking agent such as an amino resin or a polyisocyanate compound (including a blocked compound) is suitable. The solvent is preferably an organic solvent, but can be water. These liquid coating materials can be applied in a solvent solution type, a non-aqueous dispersion type, an aqueous dispersion type, an aqueous solution type and the like.

In the present invention, the single-layer coating film may be directly formed on an object to be coated such as metal or plastic,
It is preferable to previously coat an undercoat paint, further an intermediate paint, etc. on these objects to form these coating films. The single-layer coating film is a liquid coating material prepared by dissolving or dispersing the above-mentioned glitter pigment, coloring pigment and resin composition in a solvent (organic solvent and / or water), spray coating, electrostatic coating, dip coating. It is formed by coating with, for example, and heating and curing at 100 to 180 ° C.

In the present invention, a clear coating may be further applied to the above single layer coating film to form a multilayer coating film. The clear coating material is preferably a thermosetting resin composition capable of forming a coating film having excellent finished appearance and durability.
For example, a thermosetting resin composition comprising a base resin such as an acrylic resin, a polyester resin or an alkyd resin and a cross-linking agent such as an amino resin or a polyisocyanate compound (including blocked products) is suitable. The solvent is preferably an organic solvent, but can be water. These clear paints can be applied in a solvent solution type, a non-aqueous dispersion type, an aqueous dispersion type, an aqueous solution type and the like. In addition, it is preferable to add a coloring pigment or a dye to the clear coating material to such an extent that the transparency is not impaired, because the depth feeling and the depth feeling are further improved. The multi-layer coating film can be obtained by applying the liquid coating material and the clear coating material for forming the above-mentioned single-layer coating film in a two-coat one-bake system or a two-coat two-bake system. These coating and curing methods can be performed in the same manner as described above.

[0034]

【The invention's effect】

(1) Since the Munsell value (V) was adjusted to 0 to 6 and the distribution of the size of the bright pigment was adjusted as described above, a coating film having an excellent depth and depth feeling was obtained.

(2) Since it is a single-layer coating film, the coating process is simplified.

[0036]

EXAMPLES Next, examples of the present invention and comparative examples will be described.

Examples 1 to 3 and Comparative Example 1 An epoxypolyamine-based cationic electrodeposition coating (trade name "Electron No. 9000 Black") was applied to a zinc phosphate-treated steel sheet.
Kansai Paint Co., Ltd. (cured film thickness 20 μm) and amino alkyd resin-based intermediate coating (trade name “ES primer TP-16 gray”, Kansai Paint Co., Ltd.)
A steel plate coated with (cured film thickness 30 μm) is prepared. Both of these coating films were heat-cured.

Then, a glittering organic solvent type thermosetting coating material obtained by mixing and dispersing the composition shown in the following Table 1 is spray coated on the coated steel sheet so that the film thickness becomes about 20 μm (cured coating film). After being left for several minutes at room temperature, it was heated and cured at 140 ° C. for 30 minutes.

[0039]

[Table 1]

The product of the area and the number of each of the bright pigments contained in each of the divided areas obtained by equally dividing the area of each of the bright pigments is obtained for each divided area, The area ratio (%) divided by the area is shown in Table 2.

[0041]

[Table 2]

In Table 2, M1 to M4 are all 17
Divided evenly. Divided area 1 is the smallest grain and then progressively larger, divided area 17 is the largest grain. The width of each divided area is 5.2083 × 10 ³ μm ² / piece.

Examples 4 to 6 and Comparative Example 2 The glitter pigments used in the above Examples and Comparative Examples were replaced with those listed in Table 3 below to prepare glitter organic solvent type thermosetting paints. Painted.

[0044]

[Table 3]

The slope of the regression line in Table 3 above is shown in FIGS.

Examples 7 to 12 and Comparative Examples 3 to 4 A bright organic solvent type thermosetting paint was applied in the same manner as in the above Examples and Comparative Examples and allowed to stand at room temperature for 5 minutes, and then a clear paint or color clear. Paint thickness of 40μm
Spray coating was applied so that it became a (cured coating), and both coatings were simultaneously cured by heating at 140 ° C for 30 minutes (2 coat 1
Bake method).

The clear coating material is an organic solvent type thermosetting coating material containing an acrylic resin and a butylated melamine resin as main components, and the color clear coating material is an organic solvent type thermosetting coating material prepared by adding a small amount of phthalocyanine blue to the clear coating material. It is a curable paint.

The results of the performance test are shown in Table 4.

[0049]

[Table 4]

[0050]

[Brief description of drawings]

FIG. 1 is a specific example of an apparatus for measuring the area of a bright pigment in a coating film.

FIG. 2 shows the slope of a regression line in Example 4 (Table 3).

FIG. 3 shows the slope of a regression line in Example 5 (Table 3).

FIG. 4 shows the slope of a regression line in Example 6 (Table 3).

[Explanation of symbols]

 1 coated plate 2 light source 3 CCD camera 4 pseudo sunlight

Front page continued (71) Applicant 000001409 Kansai Paint Co., Ltd. 33-1 Kanzaki-cho, Amagasaki-shi, Hyogo (72) Inventor Hiroshi Hattori 1 Toyota-cho, Toyota-shi, Aichi Prefecture Toyota Motor Corporation (72) Inventor Suzuki Takaaki Aichi Prefecture, Aichi-gun, Nagakute-machi, Oita, Nagatogi, 41, Yokochi Central Research Institute Co., Ltd. (72) Inventor Takashi Wada, Aichi-gun, Aichi-gun, Nagakute-cho, 41, Yokota, Yokochi Central Research Co., Ltd. In-house (72) Inventor Morihiro Matsuda, Aichi Prefecture, Aichi-gun, Nagakute-machi, Oita, 1-41 Yokomichi Yokoido Central Research Institute Co., Ltd. (72) Inventor, Masato Ishiguro, Yokosuka City, Kanagawa No. Taura Port Town Kanto Automobile Industry Co., Ltd. In-house (72) Inventor Kenichi Sakata 1 Mizo-cho, Nishikamo-gun, Aichi Large-sized plot, Zui-ji, Kansai Paint Co., Ltd.

Claims (8)

[Claims] 1. A single-layer coating film having a feeling of depth, which comprises a bright pigment and a coloring pigment and has a Munsell value (V) in the range of 0 to 6. 2. A glittering pigment and a coloring pigment, wherein the Munsell value (V) is in the range of 0 to 6, and the particle size distribution of the glittering pigment is made uniform in the order of the area of each of the glittering pigments. The area ratio of the total area of the bright pigment contained in each divided area obtained by dividing the area is calculated for a predetermined range, and the average value of the area ratios in all the divided areas, and the area ratio in each divided area. The difference (maximum deviation) is 0.89% or less, and a single-layer coating film having a feeling of depth. 3. A glittering pigment and a coloring pigment, wherein the Munsell value (V) is in the range of 0 to 6, and
The area ratio of the bright pigment on the formed coated surface is 0.1 to 20%, and the particle size distribution of the bright pigment is equally divided into plural areas in the order of the area of each bright pigment. The area ratio for a predetermined range of the total area of the bright pigment contained in the area is calculated, and the difference (maximum deviation) between the average value of the area ratios in all the divided areas and the area ratio in each of the divided areas is calculated. A single layer coating film having a feeling of depth characterized by being 0.89% or less. 4. A glittering pigment and a coloring pigment, wherein the Munsell value (V) is in the range of 0 to 6, and
The area ratio of the bright pigment on the formed coated surface is 0.1 to 20%, and the particle size distribution range of the bright pigment is 1 to 14 on average.
0 μm, the area ratio of the total area of the bright pigment contained in each divided area obtained by equally dividing the area of each of the bright pigment into a predetermined range is calculated, and all the divided areas are calculated. A single-layer coating film having a feeling of depth, characterized in that the difference (maximum deviation) between the average value of the area ratio in each of the above-mentioned divided areas and the area ratio in each of the divided areas is 0.89% or less. 5. A luster pigment and a coloring pigment are included, and the Munsell value (V) is within a range of 0 to 6, and the particle size distribution range of the luster pigment is uniform in the area order of each luster pigment. The area ratio of the total area of the bright pigment contained in each of the divided areas is calculated with respect to a predetermined range, the vertical axis is the Log (logarithmic) area ratio, and the horizontal axis is the area of the bright pigment. The slope of the regression line with respect to each point of the graph arranged in order from the divided areas is -4.92 × 10 ^-5 (1 /
A single-layer coating film having a feeling of depth characterized by having a thickness of at least μm ² ). 6. A Munsell value (V) is in the range of 0 to 6, including a bright pigment and a coloring pigment, and
The area ratio of the bright pigment on the formed coated surface is 0.1 to 20%, and the particle size distribution range of the bright pigment is equally divided into plural areas in the order of the area of each bright pigment. The area ratio of the total area of the bright pigment contained in the divided areas to a predetermined range is calculated, and the vertical axis is the Log (logarithmic) area ratio, and the horizontal axis is the divided areas in the order of area of the bright pigment. The slope of the regression line for each point in the graph
A single-layer coating film having a feeling of depth, which is 4.92 × 10 ⁻⁵ (1 / μm ² ) or more. 7. A glittering pigment and a coloring pigment, wherein the Munsell value (V) is in the range of 0 to 6, and
The area ratio of the bright pigment on the formed coated surface is 0.1 to 20%, and the particle size distribution range of the bright pigment is 1 to 14 on average.
At 0 μm, the area ratio of the total area of the bright pigment contained in each divided area obtained by equally dividing the area of each of the bright pigments into a predetermined range is calculated, and the vertical axis indicates Log. (Logarithm) area ratio, the slope of the regression line with respect to each point of the graph in which the abscissa is arranged in order from the divided areas in the order of area of the bright pigment is -4.92 × 10 ^-5 (1 / μ
m ² ) or more, a single-layer coating film having a feeling of depth. 8. A multilayer coating film obtained by forming a clear coating film on the coating surface of any one of claims 1 to 7.