JPH11349869A - Color-developing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color-developing method whereby colors over a wide range can be easily developed with small amts. of few kinds of primary-color coating materials while utilizing the color, esp. white color, of the surface of a substrate optionally pretreated or utilizing a metallic texture of the surface of a substrate such as aluminum or stainless steel. SOLUTION: In this color-developing method, five primary-color coating materials including yellow, cyan, magenta, black, and white coating materials, each at least contg. a film-forming resin component and a colorant, and a clear coating material at least contg. a film-forming resin component are used in an arbitrary combination for color matching. The resultant color-matched coating material is applied to the surface of a substrate to form a clear or translucent coating film having a combination color of the color of the substrate surface and the transparent color of the coating film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color developing method, and more particularly, to a wide variety of primary color paints that make use of the color of the surface of a substrate or the surface of a substrate that has been subjected to an undercoating treatment, in particular, a white color, a metallic feeling, and a small number of primary colors. The present invention relates to a color expression method for easily expressing colors.

[0002]

2. Description of the Related Art In a method conventionally used in the field of printing, a large number of colors are expressed on white paper by four inks of <yellow>, <cyan>, <magenta>, and <black>. There is a way. This method is a method in which a color is expressed with ink on the whiteness of the paper based on the whiteness of the paper. As a printing form of the ink, there is a method of printing in the form of dots to obtain a composite color thereof, or a method of producing a composite color by performing overprinting on a transparent color. In the case of printing, the thickness of the ink layer is 2 μm or less, and most of the ink is absorbed by the paper layer, so that color expression using the whiteness of the paper can be easily performed. For this reason, most colors can be represented by the four primary colors.

[0003] In the case of a paint, it is usually applied so as to have a thickness of several tens of µm. The reason why the coating is performed so as to have such a film thickness is based on requests from protection of the base material, hiding of the base material surface, design properties, and the like. In the case of a solvent-type paint, the paint is applied to a desired color in advance using two or more kinds of primary color paints. When toning is performed using a completely concealed type of paint, many colors cannot be expressed with a small number of types of primary color paints. In particular, bright and highly saturated colors could not be expressed. Unlike the case where it can be expressed with a transparent color on the whiteness of the base material like printing, in the case of painting with paint, color expression is performed only by reflection of light rays on the coating film surface, Only light rays absorbed by the coating are used for color expression. For this reason, it was difficult to express bright, highly saturated colors.

[0004] Conventionally, when one color is expressed in a paint, it has been necessary to adjust the color of the paint to a target color. Further, even in the case of fine adjustment in the case where the color of the paint slightly deviates from the target color, it is necessary to make adjustments retroactively to the selection of the primary color pigment of the paint. For this reason, it is necessary to select a pigment to be used as a paint primary color for each new unknown color, determine a paint composition, and perform toning. The reason for this is basically that the coating film expresses colors in a state where the surface of the base material is completely hidden.

[0005] On the other hand, as social conditions, regulations on emission energy according to the Convention on Prevention of Global Warming and regulations on the emission of harmful substances in paints for protecting the global environment have been strictly enforced. For this reason, regarding the type and composition of paint, slurry paints, powder paints, solvent-free paints, and water-based paints that do not discharge harmful substances have been replaced by solvent paints that discharge harmful substances. In addition, there is a need to increase the efficiency of effective use of resources and reduce unnecessary stock paints by expressing a large number of colors using a small number and a small number of primary color paints.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art and to satisfy the above-mentioned demands. However, the color of the surface of the base material or the surface of the base material that has been subjected to the base treatment, especially the whiteness, the metallic feeling of aluminum, stainless steel base material etc. It is an object of the present invention to provide a color expression method capable of causing the color expression.

[0007]

Means for Solving the Problems The present inventors have made intensive studies in order to achieve the above-mentioned object, and as a result, have made the coating film transparent or translucent, and have obtained a composite color of the base material color and the transparent color of the paint. The present inventors have found that the above-mentioned problems can be achieved by expressing colors, and have completed the present invention.

[0008] In order to express a bright color by utilizing the brightness of the base material as in printing, it is preferable to use a transparent clear paint together with the primary color paint. In the case of stainless steel or white, a large number of colors can be expressed by using any combination of four primary color paints <Yellow>, <Cyan>, <Magenta> and <Black> and <Clear> paint. However, when the whiteness of the paint is insufficient, it is preferable to add a <white> primary color paint as one of the primary color paints so that white is obtained from the coating film.
It has been found that it is preferable to use the five primary color paints <Yellow>, <Cyan>, <Magenta>, <Black>, and <White> and the <Clear> paint in any combination to produce a color and to develop the color. Thus, the present invention has been completed.

That is, the color developing method of the present invention provides a <yellow> containing at least a film-forming resin component and a colorant,
<Cyan>, <Magenta>, <Black> and <White>
(Including 70 to 10% by weight of resin particles having an average particle diameter of 0.1 to 30 μm containing a resin component and a colorant having a softening temperature of 5 to 120 ° C. and 30 to 90% by weight of an aqueous medium) <Clear> paint (excluding primary color slurry paint) and at least a film-forming resin component (softening temperature of 5 to 5)
Average particle size 0.1 to 30 containing resin component at 120 ° C
(excluding clear slurry coating containing 70 to 10% by weight of resin particles of 70 μm and 30 to 90% by weight of aqueous medium) in any combination, and applying the toned coating to the surface of the base material to be transparent. Alternatively, it is characterized in that a translucent coating film is formed, and a color is expressed as a composite color of the color of the substrate surface and the transparent color of the coating film.

Further, the color developing method of the present invention provides a transparent or translucent coating film by applying the above-toned paint on the surface of a base material which has been subjected to a white base treatment. The color is expressed as a composite color of white and the transparent color of the coating film. Further, the color expression method of the present invention is a method of applying a toned paint as described above on a base material surface coated with a white paint in a wet-on-wet manner, and forming a film of the two at the same time. And a transparent or translucent layer to form a coating film, and develop a color as a composite color of the color of the white-based layer and the transparent color of the transparent or translucent layer.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the primary color paint used in the present invention contains 70 to 10 weight parts of resin particles having an average particle diameter of 0.1 to 30 .mu.m containing a resin component having a softening temperature of 5 to 120.degree. % Of the primary coating slurry containing 30% to 90% by weight of an aqueous medium and 30% to 90% by weight of an aqueous medium, the clear coating composition has an average particle diameter of 0.1% containing a resin component having a softening temperature of 5 to 120C.
70 to 10% by weight of resin particles of 1 to 30 μm and aqueous medium 30
The reason for excluding "clear slurry coating containing about 90% by weight" is Japanese Patent Application No. 10-80924 filed earlier by the present applicant.
This is to clarify the difference from the invention according to the item.

The film-forming component of the primary color paint used in the present invention is a resin. In the present invention, an alkyd resin, an acrylic resin, a polyester resin, an epoxy resin, a melamine resin, a block isocyanate resin, a fluororesin, a silicone resin, an amide resin, an ABS resin alone or as a mixture, or as an alloy, Can be used. In particular, when mixed and used, alkyd resin, acrylic resin, polyester resin, fluororesin, silicon resin, epoxy resin as the main chain, and melamine resin as the crosslinking agent, block isocyanate resin, etc. are used in combination. By doing so, the durability of the coating film can be improved, which is preferable. However, it is also possible to form a film using an alkyd resin, an acrylic resin, a polyester resin, a fluorine resin, a silicon resin, an amide resin, or an ABS resin alone.

In order to color these resins, colorants commonly used in paints, that is, coloring pigments and dyes can be used. The coloring agent used in the primary color paint used in the present invention is used, for example, outdoors depending on the purpose of use and required function of the paint, and in the case of an application requiring long-term durability, transparency, vividness, etc. are sacrificed. Even so, it is preferable to color with a highly durable pigment. Conversely, in the case of an indoor use or a decorative product in which color and design are prioritized over durability, coloring with a dye that produces a vivid color is also possible.

Hereinafter, specific materials of the colorant will be described, but this does not limit the present invention in any way. <Yellow> As a colorant for the yellow primary color paint, yellow iron oxide, titanium yellow, naphthol yellow S, Hansa yellow 10G; 5G; 3G; G; GR; A; RN; R, pigment yellow L, benzidine yellow, benzidine yellow G; GR, Permanent Yellow NCG, Vulcan First Yellow 5G; R, Tartrazine Lake, Quinoline Yellow Lake, Anthragen Yellow 6GL, Permanent Yellow FGL; H10G; HR, Anthrapyridine Yellow, Nova Palm Yellow H2G, Hansa Yellow 3R
Etc.

<Cyan> Coloring agents for the cyan primary color paint include gun blue, navy blue, cobalt blue, cerulean blue,
Alkali blue lake, peacock blue lake, fannantone blue 6G, Victoria blue lake, phthalocyanine blue, fast sky blue, indanthrene blue RS; BC, indide and the like.

<Magenta> As a coloring agent of the magenta primary color paint, red iron red, permanent red 4R; F2R;
F4R; F5R; FRL; FRLL; F4RH; FG
R; BL; F5RK, Para Red, Fire Red,
Parachlor ortho nitroaniline red, Risol first scarlet G, Brilliant first scarlet, Brilliant first scarlet G, Brilliant carmine BS; 6B, Fast scarlet V
D, Vulcan Fast Rubin B, Vulcan Fast Pink G, Light Fast Red Toner B; R, Permanent Carmine FB; FBB, Pyrazolone Red, Lisor Red, Lake Red C; D, Ansosine B, Lisor Rubin GK, Pigment Scartet 3B, Bordeaux 5B; 10B, Toluidine Maroon, Permanent Bordeaux F2R, Helio Bordeaux BL, Pont Maroon Light, Pont Maroon Museum, Eosin Lake, Rhodamine Lake B; Y, Alizarin Lake, Thioindigo Red B, Thioindigo Maroon, PV Carmine; HF3
C; HF4C; HF4B, HR Carmin, Watchung Red
Mn, Chromophtal Red BR, Monolight Fast Red YS, PV Red HF2B, Paliogen Red 3
910 etc.

<Black> As a colorant for the black primary color paint,
There are carbon black, graphite, iron black, aniline black and the like. <White> Examples of coloring agents for white primary color paints include titanium oxide, zinc white, lithopone, lead white, zinc sulfide, and antimony oxide.

The addition amount of these coloring agents and coloring pigments in the resin particles is usually about 1 to 30% in PWC. Here, PWC means Pigment Weight Concentration (pigment weight concentration), which is calculated by the following equation. PWC = [(% by weight of pigment contained) / (% by weight of total solid content in paint)] × 100

In the case of an inorganic colorant having a small oil absorption, it can be added up to about 60% in PWC, but in the present invention, up to about 30% in PWC is sufficient. In the case of an organic colorant, the oil absorption is large as compared with the inorganic colorant, but the coloring power is large.
It is about 5%. In particular, when both the oil absorption and the coloring power are large, such as carbon black, the addition amount of about 1% to 3% by PWC is sufficient.

<Clear> The clear paint, which is one of the important toning paints of the present invention, does not contain a coloring pigment in the paint, and is a paint in which the transparency of the resin is regarded as important. When the resin is formed into a coating film, the transparency of the resin is permissible to such an extent that the density and color tone can be distinguished by the color of the underlying substrate through the coated coating film.

<Metallic> When a metallic coating is performed by using the color developing method of the present invention, a metallic pigment is used. It is possible to use only one type of metallic pigment or to use two or more types simultaneously. Metallic pigments that can be used include aluminum pigment, mica pigment, bronze powder, copper powder, stainless steel powder, metal-coated glass powder, metal-coated mica powder,
There are plastic powder coated with metal.

<Preparation of luster> The luster-adjusted paint is widely required for indoor interior partitions, furniture, ceiling materials, etc., and for outdoor use such as curtain walls. In the present invention, it is easy to supply a paint for such a use. As a method of adjusting gloss, at least one of the primary color paints to be used contains a gloss adjusting agent, and toning is performed using such a primary color paint to obtain a target paint, or a gloss adjustment other than the primary color paint to be used. It is also possible to prepare a coating composition containing the agent, tones using such a coating composition and a primary color paint, and to use them. As the gloss adjusting agent, colloidal silica, alumina, talc, etc., which are usually used for paints, can be used.

In addition, barium sulfate, barium carbonate, calcium carbonate, clay, silica powder, fine silica powder, diatomaceous earth, talc, etc. are used for the purpose of adjusting the gloss value and the hardness of the coating film. , Basic magnesium carbonate, alumina white or the like can be added to such an extent that coloring power, chroma and the like are not affected.

<Production Method of Paint> The resin used for the paint may be a type soluble in a solvent or an aqueous medium, a solvent-dispersed resin such as NAD resin, or a resin dispersed in water such as an emulsion resin. Alternatively, a resin used in a solvent-type paint, an emulsion paint, or a water-soluble paint can be used. Specific types of resin include:
The above-mentioned various resins are used, and if necessary, used in combination. For example, in the case of a melamine-cured acrylic resin, the mixing ratio of the acrylic resin / melamine resin is 85/15 to 60/4 in the same manner as in a normal paint.
Mix and use so as to be about 0. It is also possible to add a small amount of p-toluenesulfonic acid as an acid catalyst as a curing acceleration catalyst. As the primary color paint for measurement and toning, a primary color paint having a stable color and in which a colorant is uniformly dispersed, has little contamination, and has a small lot difference is preferable.
For this reason, in the production of paints, it is preferable to use a ceramic-coated disperser or a disperser composed of a stainless steel base material that can sufficiently disperse the pigment and that causes less contamination from the dispersing device. As for the degree of dispersion of the pigment, etc., it is preferable from the viewpoint of the transparency of the coating film, vividness, etc., as long as it can be completely dispersed up to the primary particles of the pigment. It may be difficult to disperse. However, the object of the present invention can be almost attained if the pigment can be dispersed to such an extent that there are no pigment particles large enough to protrude to the surface of the coating film as in the case of ordinary paints.

<Toning> In the color expression method of the present invention, any combination of the five primary color paints <yellow>, <cyan>, <magenta>, <black> and <white> and the <clear> paint is used. Toning using.

The five primary colors of <yellow paint>, <cyan paint>, <magenta paint>, <black paint>, and <white paint> are used in order to express colors in as wide a range as possible with the small number of primary color paints. It is important that the color tendency of each pigment used in the paint, for example, the color tendency of the yellow pigment of <yellow paint> is bluish or reddish, and it is also important that the vividness and chroma are large.

The reason for this is that by using these primary color paints, the color range that can be toned occupies as large a volume as possible in the color solid to facilitate toning. Therefore, a primary color paint that uses inexpensive and easily colored yellow iron oxide as a coloring agent for <yellow paint> and a primary color paint that also uses inexpensive and easily colored iron oxide rust as a coloring agent for <magenta paint> In the case of toning using a color, the color range that can be toned is only a very narrow part close to the center axis and close to the bottom in the color solid, and there is a large restriction on the toning of the primary color paint and the expression of colors.

When a primary color paint is toned to a desired color, it is necessary to calculate the blending ratio of each primary color paint. Normally, this is performed using a computer color matching system while checking the pigment ratio and the primary color ratio with the results of colorimetry. However, it is also possible to adopt a method in which the colors are compared with the eyes of a professional.

In the method of expressing color of a paint according to the present invention, in order to develop various colors with a small number of primary color paints, it is necessary to adjust the color of the base material in addition to the reference color. As the color of the base material, a base material having relatively high brightness, such as a white-painted or printed base material, anodized aluminum, or a satin-finished stainless steel base material, is preferable. However, in some cases, a black casting or a paint to be applied to a bronze or gold brass base material is required. If the color of the base is strong, such as casting or brass, and it is expected that the color cannot be reproduced even if the paint is applied, apply a white paint on the base material, and then apply a colored paint on it. Toning in the painting process. As the white paint, a solvent-based paint, a water-based paint, a powder paint, a slurry paint, and the like are possible, and it is also possible to paint in advance, dry, and form a film, and then color it with a toned paint. It is also possible to apply a paint, apply a toned paint on it wet-on-wet, and heat and form both at the same time.

Of course, it is also possible to develop a color design by applying a toned paint using gold as a reference color, like brass, but a high level of technology is required for color reproducibility. Aluminum with alumite treatment on the base,
When a matte-treated stainless steel base material is used, a metallic feeling is added to the color more than the whiteness, and a design different from the color toned with the metallic paint can be expressed.

<Formation of Coating Film> The formation of a coating film using a toned paint can be carried out by a usual paint coating machine. Normal air spray coating, or in the case of a water-based coating, can be easily applied by an electrostatic coating machine with an electrostatic block, an airless coating machine, or the like. What should be noted during coating is the uniformity of the film thickness. In particular, in the case of a lightly colored color, the color developed due to the unevenness of the coating film thickness becomes darker or thinner, and color unevenness occurs. In the case of a dark color, the effect of the whiteness of the base material is small as a percentage of the color, and the difference due to the applied film thickness is hard to appear.
When the coating applied to the substrate is a room temperature drying type coating,
The coating film is formed by holding it as it is. In the case of a bake-hardening paint, the temperature is raised to a predetermined coating film forming temperature and held for a predetermined time to form a coating film.

In the color developing method of the present invention, instead of hiding the surface of the substrate, the coating is made transparent or translucent, and the color of the surface of the substrate or the surface of the substrate subjected to the undercoating treatment, particularly white or aluminum, Since the color is expressed by a composite color of the color of the base material and the transparent color of the paint by utilizing the metallic feeling of the surface of the stainless steel base material, it is preferable to reduce the film thickness, and as a result, A small amount of paint is required.

[0033]

The present invention will be described in more detail with reference to the following examples. In the following description of the examples, parts are parts by weight, and% is% by weight. <Preparation of resin> 80 parts of solvent naphtha # in a reaction kettle
100 and 20 parts of butyl acetate are charged and the temperature is 100
The temperature was raised to ° C. Methyl methacrylate 36 is added to the dropping tank.
Parts, 2-ethylhexyl acrylate 13 parts, styrene monomer 31 parts, isobutyl methacrylate 11 parts,
After 7 parts of hydroxyethyl methacrylate and 2 parts of acrylic acid were charged and mixed, 3 parts of a polymerization initiator was dissolved in the mixture immediately before the start of dropping. This mixture was added dropwise over 30 minutes to start the reaction. After further reacting for 2 hours, the reaction temperature of the reaction solution was raised to 120 ° C., and 0.5 part of the polymerization catalyst was dissolved in 4.5 parts of xylol and added dropwise over 3 minutes, and the reaction was maintained for 30 minutes. , Nonvolatile content 50%, average molecular weight Mw = 11000, Mn = 4200, hydroxyl value = 3
An acrylic resin having an acid value of 0 and an acid value of 15.5 was obtained.

<Preparation of clear paint> To 76 parts of the above acrylic resin, 16 parts of a butyl etherified melamine resin (nonvolatile content: 60%), 2 parts of a surface conditioner, 3 parts of a fluidity improver and 3 parts of an ultraviolet absorber were added. Evenly mix to obtain a nonvolatile content of 4
7.6% clear paint was obtained.

<Preparation of White Primary Color Paint> A surface conditioner 2 was added to 64 parts of the same acrylic resin as the raw material of the clear paint.
Parts, 2 parts of a fluidity improver, 15 parts of a titanium dioxide pigment and 1 part of a pigment dispersant, and the pigment was dispersed with a conventional kneading machine. To this white pigment dispersion base, 13 parts of a butyl etherified melamine resin (nonvolatile content: 60%) and 3 parts of an ultraviolet absorber were added and uniformly mixed to obtain a white primary color paint.

<Preparation of yellow primary color paint> A surface conditioner 2 was added to 75 parts of the same acrylic resin as the raw material of the clear paint.
Parts, 2 parts of a fluidity improver, 3 parts of a yellow pigment (Novapalm Yellow H4G) and 1 part of a pigment dispersant, and the pigment was dispersed with a usual kneading machine. 14 parts of a butyl etherified melamine resin (60% non-volatile content) and 3 parts of an ultraviolet absorber were added to this yellow pigment dispersion base and uniformly mixed to obtain a yellow primary color paint.

<Preparation of magenta primary color paint> A magenta primary color paint was obtained in exactly the same manner as in the preparation of the yellow primary color paint, except that the yellow pigment was replaced with a red pigment (permanent red F5RK). <Preparation of Cyan Primary Color Paint> The yellow pigment in preparing the yellow primary color paint was replaced with a blue pigment (Phthalocyanine Blue 49).
Except for changing to 40), the same treatment was performed to obtain a cyan primary color paint.

<Preparation of black primary color paint> A surface conditioner 2 was added to 76.5 parts of the same acrylic resin as the raw material of the clear paint.
Part, 1 part of fluidity improver, black pigment (carbon black M
A100S) 1.5 parts and a pigment dispersant 2 parts were added, and the pigment was dispersed with a usual kneading machine. A butyl etherified melamine resin (nonvolatile content 60%) 14
And 3 parts of an ultraviolet absorber, and uniformly mixed to obtain a black primary color paint.

<Coating of paint> The primary color paint and the toning paint obtained as described above are applied as follows on the surface of the work to which the white paint is applied, and the effect is expressed in color. Confirmed by the size of. The coating was uniformly applied by air spray coating so that the dry film thickness was 25 μm. After the coating was allowed to stand for 7 minutes, it was kept in a drying oven at 150 ° C. for 25 minutes to obtain a cured coating film.

<Color Measurement of Coating Film> The color measurement of each coating film was carried out using a colorimeter manufactured by Suga Test Instruments Co., Ltd. <SM Color Computer SM
-5> and measured as values of L, a, and b. Table 1 shows the results.

[0041]

Examples 1 to 5 Toning paints were prepared according to the formulations (parts by weight) shown in Table 2 below, and were applied as follows on the surface of a workpiece previously coated with a white paint. The effect was confirmed by the range of color expression. The paint was uniformly applied by air spray coating so that the applied film thickness was 25 μm in the formed film thickness. After coating, the wet coating film was dried in a drying furnace at a rate of 30 ° C./min.
The mixture was heated to 0 ° C. (arrival time: 3 minutes), and then reached 150 ° C., and was kept at 150 ° C. for 25 minutes to obtain a dried coating film. The gloss, L, a, b values and appearance color were determined for the developed color of each coating film. Table 2 shows the results.

[0043]

[0044]

According to the color developing method of the present invention, a wide range of colors can be easily prepared by utilizing the color of the surface of the substrate or the surface of the substrate subjected to the undercoating, particularly the white and metallic feeling, and by using the five primary color paints and the clear paint. Can be expressed.

Claims (4)

[Claims] 1. A primary color paint of five colors <Yellow>, <Cyan>, <Magenta>, <Black> and <White> containing at least a film-forming resin component and a colorant (softening temperature of 5).
Excluding a primary color slurry coating containing 70 to 10% by weight of resin particles having an average particle diameter of 0.1 to 30 [mu] m containing a resin component and a colorant at a temperature of up to 120 [deg.] C. and 30 to 90% by weight of an aqueous medium); Containing clear resin component <Clear>
Coating (70 to 10% by weight of resin particles having an average particle diameter of 0.1 to 30 μm containing a resin component having a softening temperature of 5 to 120 ° C.)
And a clear medium containing 30 to 90% by weight of an aqueous medium) in any combination, and applying the toned coating to the substrate surface to form a transparent or translucent coating film. A color developing method characterized in that a color is developed as a composite color of a color of the substrate surface and a transparent color of the coating film. 2. The method according to claim 1, wherein the surface of the base material subjected to the white base treatment is applied to the base material.
A transparent or translucent coating film is formed by applying a paint toned as described in, and a color is expressed as a composite color of the base white and the transparent color of the coating. Color expression method. 3. The method according to claim 1, wherein the surface of the base material to which the white paint is applied is applied.
Apply the paint toned as described in the wet-on-wet, forming a coating film consisting of a white-based layer and a transparent or translucent layer by simultaneously forming a film,
A color developing method characterized by expressing a color as a composite color of the color of the white-based layer and the transparent color of the transparent or translucent layer. 4. The resin component is an alkyd resin, an acrylic resin,
Polyester resin, epoxy resin, melamine resin, block isocyanate resin, fluororesin, silicone resin,
4. The color developing method according to claim 1, comprising at least one of an amide resin and an ABS resin.