JP7428749B2 - Method of forming decorative coating surface - Google Patents

Description

The present invention relates to a novel method for forming a decorative coating surface.

BACKGROUND OF THE INVENTION Conventionally, decorative coatings having various patterns have been formed on walls of buildings, civil engineering structures, etc. An example of such a decorative coating is a decorative coating in which a pattern is formed by partially overlaying a plurality of coating materials.

For example, Patent Document 1 describes a method in which an undercoat is applied to the entire surface and, before the undercoat dries, a pattern is applied with a paint (patterned paint) darker than the undercoat. However, in Patent Document 1, since the patterned paint is applied before the undercoat dries, the undercoat and patterned paint are likely to mix on the surface to be coated, which may reduce the contrast in color, texture, etc. There is.

JP2008-266911A

The present invention was made in view of these problems, and an object of the present invention is to provide a method for forming a decorative coating surface having contrast and high aesthetic appeal.

In order to solve these problems, the inventor of the present invention has conducted intensive studies and has come up with a method for forming a decorative coating surface by applying a plurality of specific coating materials to the surface to be coated using a specific method, and has devised the present invention. I ended up completing it.

That is, the present invention has the following features.
1. A method for forming a decorative coating surface in which at least two or more types of colored regions coexist, the method comprising:
Using at least two types of coating materials with a color difference (△E) of 3 or more,
All of the above coating materials have a heating residue of 25% by weight or more,
On the surface to be coated,
A first step of applying a first coating material, a second step of applying a second coating material,
The viscosity of the first coating material and the second coating material is 0.1 to 10 Pa·s,
The viscosity of the second coating material is higher than that of the first coating material,
The difference in viscosity between the first coating material and the second coating material is 1 to 8 Pa·s,
After the first coating material becomes non-fluid, applying the second coating material discontinuously using a roller or a pressing tool having a sponge material,
A method for forming a decorative coating surface, wherein the sponge material is a mixture of at least five types of sponge materials having different hardnesses and/or densities.
2. 1. characterized by applying the first covering material to the entire surface; A method for forming a decorative film surface as described in .
3. 1. The first coating material is discontinuously applied to the surface to be coated using a sponge material. A method for forming a decorative film surface as described in .

In the present invention, at least two types of coating materials having a color difference (ΔE) of 3 or more are used, each of the above coating materials has a heating residue of 25% by weight or more, and the above two types of coating materials are applied to the coated surface. At least 2 coats of coating material are applied in sequence by applying the coating material of the next step in a discontinuous manner after the coating material applied first in the previous step becomes non-flowing. This forms a decorative coating surface in which more than one colored region is mixed, and it is possible to obtain a decorative coating surface with contrast and high aesthetic appearance.

FIG. 1 is a front view showing an example of a decorative coating surface formed according to the present invention. FIG. 2 is a sectional view showing an example of a pressing tool that can be used in the present invention. FIG. 3 is a sectional view showing an example of a roller that can be used in the present invention. FIG. 4 is a front view showing an example of a decorative coating surface formed according to the present invention.

1. Decorative coating surface 1a. Colored area A
1b. Colored area B
1c. Colored area C
2. Pressing tools 2a to 2e. Spongy material 2f. Height direction 3. Rollers 3a to 3e. Spongy material 3f. Cylinder outer circumferential surface 3g. Cylinder outer diameter direction

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated.

The present invention is a method for forming a decorative coating surface in which at least two or more types of colored areas coexist, in which at least two types of coating materials having a color difference (ΔE) of 3 or more are used as coating materials, and the coating material All of these are characterized by having a heating residue of 25% by weight or more. The process includes the step of applying the above two types of coating materials to the surface to be coated, respectively, and after the coating material applied first in the previous step becomes non-flowing, the next step is applied. The coating is characterized by discontinuously (partially) applying the coating material using a sponge material. The decorative coating surface formed by the present invention has at least two or more types of colored regions (for example, colored region A, colored region B, etc.) coexisting when viewed from the front. Further, a discontinuously applied coating is formed on the surface side of the decorative coating surface.

FIG. 1 shows an example (front view) of a decorative coating surface formed according to the present invention. According to the method for forming a decorative coating surface of the present invention, when viewed from the front as shown in Fig. 1, colored area A (Fig. 1: 1a) and colored area B (Fig. 1: 1b) coexist, and the contrast is It is possible to form a decorative coating surface with a high aesthetic appearance.

The method for forming the decorative coating surface shown in FIG. 1 will be described below as an example.

In FIG. 1, two types of coating materials, a first coating material and a second coating material, are sequentially applied to form a decorative coating surface. As the first coating material and the second coating material, those having a color difference (ΔE) of 3 or more (preferably 5 or more) are used. By setting the color difference (ΔE) to a specific value in this manner, it is possible to form a highly aesthetically pleasing coating having contrast between the colored regions. The upper limit of the color difference (ΔE) is not particularly limited, but is preferably 90 or less, and can be set depending on the desired design. For example, when creating a calm design with a sense of unity while providing contrast, the upper limit of the color difference (ΔE) is preferably 20 or less. On the other hand, when forming an accent design with clear contrast between colored regions, it is preferable that the color difference (ΔE) is greater than 20 and less than or equal to 90.

Note that the color difference (ΔE) in the present invention is a value measured using a color difference meter. Specifically, each coating material was applied to a standard white paper using a film applicator with a gap of 250 μm, and the coated surface was placed horizontally under standard conditions (temperature 23 ° C., relative humidity 50%. The same applies hereinafter). It can be calculated using the following formula from the L ^* value, a ^* value, and b ^* value (average value of three or more measurement points) of the film when dried for a certain period of time.
<Formula> △E={(L ^*1 - L ^*2 ) ² + (a ^*1 - a ^*2 ) ² + (b ^*1 - b ^*2 ) ² } ^0.5
(In the formula, L ^*1 , a ^*1 , b ^*1 are the L ^* , a ^* , b* of the first coating material, respectively. L ^{*2 ,} a ^*2 , b ^*2 are the L of the second coating material, respectively. ^* , a ^* , b ^* )

In addition, the two types of coating materials, the first coating material and the second coating material, can form various designs (patterns) by combining arbitrary color tones so as to satisfy the above range of color difference (△E). Can be done. In the present invention, it is particularly preferable that the second covering material has a darker tone than the first covering material. By discontinuously applying a dark-toned coating material as the second coating material, the boundaries between colored regions are easily recognized, and a highly aesthetically pleasing decorative surface can be stably formed. Note that "dark" here indicates that the lightness L ^* (CIEL ^* , a ^* , b ^* color space) is lower than that of the first covering material.

As a method for forming the decorative coating surface shown in FIG. 1, for example,
A first step of applying a first coating material to the surface to be coated, a second step of applying a second coating material,
(I) A method of applying a first coating material to the entire surface to be coated, and discontinuously applying a second coating material after the first coating material becomes non-flowing;
(II) A method of discontinuously applying a first coating material to the surface to be coated, and discontinuously applying a second coating material after the first coating material becomes non-flowing;
etc.

In (I) above, the amount of the first coating material to be applied may be set appropriately taking into consideration the type, condition, finish, etc. of the surface to be coated, but is preferably 30 to 500 g/m ² , more preferably 80 g/m 2 . -400g/m ² , more preferably 90-300g/m ² . When the amount of the first coating material applied satisfies the above range, a continuous film that covers the entire surface of the coated surface is likely to be formed. Further, the amount of the second coating material to be applied may be set as appropriate depending on the desired finish (pattern, etc.), but it is preferable that the amount of the second coating material to be applied is smaller than that of the first coating material. It is preferably 100 g/m ² or less, more preferably 5 to 90 g/m ² , even more preferably 10 to 80 g/m ² . When the application amount of the second coating material satisfies the above range, a discontinuous coating is likely to be formed, and a decorative coating surface in which different colored areas are mixed can be stably formed. In the present invention, "a to b" has the same meaning as "a or more and b or less".

In (II) above, the coating amount of at least one of the first coating material and the second coating material is preferably 100 g/m ² or less (more preferably 5 to 90 g/m ² , still more preferably 10 to 80 g /m ² ). The other type of coating material may be set appropriately considering the type, condition, finish, etc. of the surface to be coated, but is preferably 500 g/m ² or less (more preferably 100 g/m ² or less, still more preferably 5 g/m 2 or less). 90 g/m ² , particularly preferably 10 to 80 g/m ² ). In the above (II), it is preferable that the coating amounts of the first coating material and the second coating material are each within a range of 100 g/m ² or less.

Further, in (I) above, the coating amount of the coating material applied to the entire surface of the surface to be coated is preferably 10 to 500 g/m ² , more preferably 20 to 400 g/m 2 in terms of solid content. It is ² . In addition, in (I) and (II) above, the coating amount of the coating material discontinuously applied to the surface to be coated is preferably 100 g/m ² or less, more preferably 1 to 100 g/m 2 in terms of solid content. 80 g/m ² , more preferably 5 to 40 g/m ² . In the above (I), it is preferable that the amount of the second coating material applied is smaller than the amount of the first coating material applied.

The coating material in the present invention can be diluted with various solvents at the time of application. The dilution ratio of the coating material can be set as appropriate as long as it satisfies the heating residue range of the coating material of the present invention, but it is preferably 0 to 50% by weight (more preferably 0% by weight) based on the coating material. ~30% by weight). In the present invention, it is preferable that the dilution ratio of the coating material in the second step (next step) is smaller than the dilution ratio of the coating material in the first step (the coating material applied earlier). In particular, in (I) above, a coating material with a high dilution ratio (preferably 1 to 50% by weight, more preferably 2 to 40% by weight) is applied as the first coating material to the entire surface to be coated, and the second coating material is coated on the entire surface to be coated. It is preferable to apply a coating material discontinuously with a small dilution ratio (preferably 0 to 20% by weight, more preferably 0 to 10% by weight). In this case, it is possible to more efficiently form a decorative coating surface with contrast and high aesthetic appeal, in which different colored regions coexist.

The viscosity of the coating material during application is preferably 0.1 to 10 Pa·s, more preferably 0.5 to 9.5 Pa·s. In particular, in (I) above, the viscosity of the coating material in the first step (previously applied coating material) at the time of application is preferably 0.1 to 8 Pa·s (more preferably 0.5 to 6 Pa·s). s). In such a case, a continuous film that covers the entire surface to be coated is likely to be formed, and excellent finish quality can be ensured. On the other hand, the viscosity of the coating material in the second step (next step) during application is preferably 2 to 10 Pa·s (more preferably 2.5 to 9.5 Pa·s). In such a case, the sponge material contains an appropriate amount of the coating material, and a discontinuous film is likely to be formed, and the boundaries between the colored regions become clear, thereby improving the design. In particular, in (I) above, it is preferable that the viscosity of the coating material in the second step (next step) is higher than the viscosity of the coating material in the first step (the coating material applied earlier), and the difference in viscosity is preferably 1 to 8 Pa·s (more preferably 1.5 to 6 Pa·s). In this case, it is possible to more efficiently form a decorative coating surface with contrast and high aesthetic appeal, in which different colored regions coexist.

Further, in the above (II), the viscosity of the first coating material and the second coating material during application is preferably 2 to 10 Pa·s (more preferably 2.5 to 9.5 Pa·s). In such a case, the sponge material contains an appropriate amount of the coating material, and a discontinuous film is likely to be formed, and the boundaries between the colored regions become clear, thereby improving the design. Note that the viscosity is a value (pointer value at the 4th rotation) measured using a BH type viscometer (rotation speed 20 rpm) under standard conditions (temperature 23° C., relative humidity 50%).

In (I) and (II) above, the timing of applying the second coating material is not particularly limited as long as it is after the first coating material (the previously applied coating material) is in a non-flowing state. In the present invention, the term "non-fluid state" refers to a state in which fluidity of the film is lost after the first coating material is applied, and specifically, it refers to a state where the fluidity of the film is lost after the first coating material is applied. This refers to the state in which coating materials have dried and hardened to the extent that they do not bleed, or that the coating materials do not mix with each other. This "non-fluid state" includes states such as dry to the touch, semi-cured dry, and cured dry as defined in JIS K5400. In the present invention, it is preferable to apply the second coating material after the first coating material is dry to the touch (more preferably after semi-hardening and drying, still more preferably after hardening and drying). In the present invention, drying and curing may preferably be carried out at room temperature (5 to 40°C).

Unlike the present invention, if the second coating material is applied while the first coating material is in a fluid state, the first coating material and the second coating material will gradually mix in the application tool during the coating process, resulting in formation of There is a risk that the finish of the coated film will become unstable. Furthermore, the coating materials are mixed together on the surface to be coated, and the contrast is likely to be reduced. In contrast, in the present invention, by discontinuously applying the second coating material after the first coating material becomes non-flowing, it is possible to prevent the respective coating materials from mixing and to provide a stable finish. It is possible to obtain a highly aesthetically pleasing decorative film with contrast. In particular, remarkable effects can be obtained when the surface to be coated is large.

Examples of application tools for applying the coating material include sprays, rollers, brushes (including brushes, etc.), pressing tools (including hammering tools, etc.), and the like. Among these, examples of the roller include a fibrous roller and a porous (spongy) roller, and examples of the pressing tool include those made of sponge, felt, woven fabric, non-woven fabric, and the like.

In (I) above, when applying the coating material to the entire surface to be coated, it is desirable to use, for example, a spray, a roller, a brush, or the like. As the roller, a fibrous roller is particularly suitable.

In the present invention, when applying the covering material discontinuously as in (I) and (II) above, a sponge material is used. In the present invention, when applying the coating material discontinuously, by using such a sponge material, it is possible to provide contrast and make the boundaries between colored areas non-linear (intricate). It is possible to further improve the aesthetic appearance.

In the step of applying the coating material discontinuously, a sponge material may be used to apply the coating material so that it partially adheres to the surface to be coated. To apply the coating material discontinuously, it is sufficient to bring the spongy material into contact with the surface to be coated intermittently (partially). For example, applying by pressing, applying by tapping, etc. , a method of applying while rubbing, etc. can be adopted. In this step, an applicator having a spongy material can be used, and a roller or a pressing tool having a spongy material is suitable. In addition, when using a roller having a spongy material, it is preferable to roll the coating material discontinuously, that is, to contact and roll the coating material intermittently (partially) on the surface to be coated. At this time, it is preferable that the rollers contact and roll in random directions.

As the sponge material, for example, a porous sponge-like resin such as acrylic resin, urethane resin, ester resin, or ethylene resin can be used. The hardness of the sponge material is preferably 10 to 3000N, more preferably 20 to 2000N, even more preferably 30 to 1500N. The density of the sponge material is preferably 1 to 300 kg/m ³ , more preferably 3 to 200 kg/m ³ , and even more preferably 5 to 150 kg/m ³ . The term "hardness" used herein refers to the value of hardness (C method) measured from the force when compressing a test piece to a thickness of 40%, in accordance with JIS K6400-2. Moreover, "density" is the value of the apparent density calculated from the weight and dimensions of the test piece according to JIS K7222.

The shape of the sponge material is, for example, a polygonal shape such as a triangle, square, diamond, pentagon, or hexagon, a curved shape such as a circle, an ellipse, a drop shape, or an irregular shape. Furthermore, shapes that are a combination of these can also be used. The size may be appropriately set depending on the desired pattern.

As the sponge material, one type of sponge material that satisfies the above conditions can be used, but for example, at least two or more types of sponge materials with different hardness and/or density as shown in Fig. 2 (Fig. 2: 2a to 2e) are mixed randomly, or at least two or more types of sponge materials (3a to 3e) with different hardness and/or density as shown in FIG. It is preferable to apply with a roller mixed in 3f). In such an applicator, at least one type (preferably two or more types) of sponge material satisfies the above conditions. By using such a specific application tool, the finish quality, aesthetic appearance, etc. can be further improved.

In FIGS. 2 and 3, it is more preferable that the sponge material is fixed in a stacked manner. Furthermore, it is even more preferable that a large number of spongy materials be compression-molded so that they are mixed randomly.

The sponge material shown in FIGS. 2 and 3 has an irregular three-dimensional outer shape, and the individual size thereof is preferably 1 to 30 mm (more preferably 2 to 20 mm). In the present invention, it is preferable that a large number of sponge materials of different sizes coexist. In such a case, irregular irregularities are likely to be formed between the sponge materials, so that the effects of the present invention can be further enhanced. Note that the "size" here refers to the longest axis of the outer shape, and is measured by, for example, sieving with a sieve having squares of a predetermined size on one side. The thickness of the sponge material (Figure 2: thickness in the 2f direction, Figure 3: thickness in the 3g direction) is preferably 2 to 50 mm (more preferably 3 to 50 mm), although it depends on the size of the individual sponge material. 30mm).

FIG. 4 shows another example (front view) of a decorative coating surface formed by the method for forming a decorative coating surface of the present invention. Figure 4 shows that three types of coating materials, a first coating material, a second coating material, and a third coating material, are applied in order, and a colored area A is colored by the first coating material, and a colored area A is colored by the second coating material. A decorative coating surface having a colored area B and a colored area C (FIG. 4: 1a to 1c) formed by a third coating material is formed. The decorative coating surface shown in FIG. 4 may be formed by the same method as in the case of FIG. 1, for example,
Applying the first coating material to the entire surface or discontinuously (first step),
After the first coating material becomes non-flowing, a second coating material is applied discontinuously (second step),
After the second coating material is in a non-flowing state, a third coating material is discontinuously applied (third step);
It can be formed by etc.

In the case of three types of coating materials, it is sufficient that the color difference (ΔE) between at least two types of adjacent coating materials on the surface of the decorative coating to be formed satisfies the above conditions. Examples of such an embodiment include, for example,
(X) a first covering material and a second covering material,
(Y) a first covering material and a third covering material,
(Z) a second covering material and a third covering material,
Examples of the combinations include a mode in which at least one combination satisfies the above conditions, a mode in which two combinations satisfy the above conditions, a mode in which three combinations each satisfy the above conditions. In the present invention, it is preferable that two or three combinations of the above (X), (Y), and (Z) satisfy the above conditions. Also, when using four or more different types of coating materials, apply the coating materials (first coating material, second coating material, third coating material, fourth coating material, etc.) in the same way ( (first step, second step, third step, fourth step, etc.), forming a decorative coating surface having colored areas A, colored areas B, colored areas C, colored areas D, etc. Bye.

In the method for forming a decorative coating surface of the present invention, a clear coating material is applied to the outermost surface to form a clear layer for the purpose of surface protection, improvement of weather resistance, stain resistance, etc., as long as it does not impede the effects of the present invention. It is also possible to provide one. Such a clear layer may be colorless and transparent or colored and transparent, and may be glossy or matte (including 7-minute gloss, 5-minute gloss, 3-minute gloss, etc.).

<Surface to be coated>
The surface to be coated in the present invention is preferably a base material surface of a building, a civil engineering structure, etc., particularly a base material constituting the surfaces of internal and external walls, ceilings, fittings, etc. Such base materials include, for example, gypsum board, concrete, mortar, porcelain tile, brick, cement board, fiber-mixed cement board, cement calcium silicate board, perlite board, ALC board, siding board, extrusion board, plywood, Examples include wood plates, steel plates, plastic plates, glass plates, etc. The surface of these base materials may be subjected to some kind of surface treatment (e.g., sealer, surfacer, filler, etc.), or may have a coating already formed on it, or may have wallpaper pasted on it. .

<Coating material>
As the coating material in the present invention, one containing a resin and a pigment can be used. In the present invention, color, gloss, etc. can be set by adjusting the type of pigment, mixing ratio, etc. The mixing ratio of the resin and the pigment is preferably 5 to 500 parts by weight (more preferably 20 to 400 parts by weight, still more preferably 30 to 300 parts by weight) per 100 parts by weight of the resin solid content.

Examples of the resin include water-soluble resins, water-dispersible resins, solvent-soluble resins, solvent-free resins, non-aqueous dispersible resins, and composites thereof. These may have crosslinking reactivity, and their form is not particularly limited, and may be either a one-part type or a two-part type. In the present invention, water-dispersible resins and/or water-soluble resins are particularly preferably used. Examples of usable resins include cellulose, polyvinyl alcohol, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, silicone resin, acrylic resin, urethane resin, acrylic silicone resin, and fluorine resin. Examples include resins, and composite systems thereof. In the present invention, it is preferable not to use a hydraulic binder such as cement because it may limit the color of the coating.

As the pigment, known coloring pigments, extender pigments, etc. can be used. Among these, examples of coloring pigments include titanium oxide, zinc oxide, carbon black, lamp black, bone black, graphite, black iron oxide, copper chromium black, cobalt black, copper manganese iron black, iron oxide, molybdate orange, and permanent pigment. Red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, fast yellow, benzimidazolone yellow, chrome green, cobalt green, phthalocyanine green, ultramarine, navy blue, cobalt blue, phthalocyanine blue, quinacridone violet , dioxazine violet, aluminum pigments, pearl pigments, glitter pigments, and the like. By using one or more of these coloring pigments, it can be colored to any desired hue.

Examples of extender pigments include heavy calcium carbonate, agarite, light calcium carbonate, white carbon, talc, kaolin, clay, china clay, china clay, diatomaceous earth, barite powder, barium sulfate, precipitated barium sulfate, silica sand, and silica stone. Examples include powder, quartz powder, resin beads, glass beads, hollow balloons, etc., and one or more of these can be used. By appropriately setting the type of extender pigment, mixing ratio, etc., it is possible to adjust the glossiness of the coating material to a desired level.

In addition to the above-mentioned components, the coating material of the present invention may contain known additives, such as aggregates, dyes, thickeners, wetting agents, antifreeze agents, and film-forming agents, within the range that does not significantly impede the effects of the present invention. It may contain agents, preservatives, anti-mold agents, algaecides, antibacterial agents, dispersants, antifoaming agents, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, diluting solvents, and the like. The coating material can be manufactured by uniformly mixing the above-mentioned components using a conventional method.

The heating residue of the coating material is 25% by weight or more, preferably 30 to 80% by weight. In the present invention, since the heating residue of the coating material is within this range, it is suitable for providing contrast, etc., and furthermore, the time required for drying and curing can be shortened, and non-flowing can be achieved early. You can get the status. If the heating residue of the coating material is less than the above value, the contrast tends to become unclear and it takes time to obtain a non-fluid state. Note that the heating residue is a value measured by the method of JIS K5601-1-2, the heating temperature is 105° C., and the heating time is 60 minutes.

Further, in the present invention, it is sufficient that the heating residues of the first coating material, the second coating material, etc. satisfy the above range, but it is preferable to set the heating residue of the second coating material higher than that of the first coating material. . Thereby, the effect of the present invention can be enhanced. Note that the heating residue can also be set by the dilution ratio of the coating material; for example, the coating material with a large dilution ratio may be used as the first coating material, and the coating material with a small dilution ratio may be used as the second coating material. . The difference in heating residue between the first coating material and the second coating material is preferably 1 to 30% by weight, more preferably 2 to 25% by weight, and even more preferably 3 to 20% by weight.

The hiding rate of the covering material is preferably 70% or more, more preferably 80% or more, and still more preferably 90% or more. If the hiding rate of the coating material is within such a range, the formed film of the coating material can be made opaque, which is suitable for providing contrast. The hiding rate is determined by applying the coating material to a hiding rate test paper using a film applicator (gap 150 μm) and drying it under standard conditions for 24 hours. After measuring the luminous reflectance of the test piece, This is the value calculated by the formula.
<Formula>
Hiding rate (%) = (Luminous reflectance of paint film on black ground) / (Luminous reflectance of paint film on white ground) x 100

Examples are shown below to clarify the features of the present invention.

The following materials were prepared as covering materials.

・Coating material 1-1
Light gray coating material (L ^* value: 89.1, a ^* value: -0.3, b ^* value : 4.1, gloss: 11, heating residue: 54% by weight, viscosity: 3.5 Pa・s, hiding rate: 97%, pigment ratio: 130 parts by weight per 100 parts by weight of resin solid content)

・Coating material 1-2
White coating material (L ^* value: 97.4, a ^* value: -0.4, b ^* value: 1.6, glossiness: acrylic resin emulsion, pigment (titanium oxide, extender pigment) as main components 11. Heating residue: 57% by weight, viscosity: 5 Pa·s, hiding rate: 97%, pigment ratio: 134 parts by weight based on 100 parts by weight of resin solid content, color difference ΔE with coating material 1-1: 8. 7)

・Coating material 2-1
Dark gray coating material (L ^* value: 36.5, a ^* value: -0.2, b ^* value: -1. 8. Glossiness: 10, heating residue: 40% by weight, viscosity: 2.1 Pa・s, hiding rate: 98%, pigment ratio: 140 parts by weight per 100 parts by weight of resin solid content)

・Coating material 2-2
Black coating material (L ^* value: 26.4, a ^* value: 0.1, b ^* value: -0.3 , Glossiness: 10, Heat residue: 56% by weight, Viscosity: 4.8 Pa・s, Hiding rate: 98%, Pigment ratio: 138 parts by weight per 100 parts by weight of resin solid content, Same as coating material 2-1. Color difference △E: 10.2)

・Coating material 3-1
White coating material (L ^* value: 97.0, a ^* value: -0.7, b ^* value: 2.1 , glossiness: 10, heating residue: 70% by weight, viscosity: 7 Pa・s, hiding rate: 98%, pigment ratio: 180 parts by weight per 100 parts by weight of resin solid content)

・Coating material 3-2
Beige coating material (L ^* value: 88.7, a ^* value: -0.1, whose main components are acrylic resin emulsion and pigments (carbon black, yellow iron oxide, red iron oxide, titanium oxide, extender pigment) b ^* value: 3.9, gloss: 10, heating residue: 70% by weight, viscosity: 7 Pa・s, hiding rate: 98%, pigment ratio: 185 parts by weight per 100 parts by weight of resin solid content, coating material Color difference with 3-1 △E: 8.5)

(Example 1)
As a first step, coating material 1-1 was applied to the entire surface of the base material (slate board) with a coating amount of 120 g/m ² (coating amount 64.8 g/m ² ) using a roller (using a fibrous roller). , and was dried for 2 hours until it was more than dry to the touch. Next, as a second step, coating material 1-2 was applied discontinuously at a coating amount of 40 g/m ² (coating amount 22.8 g/m ² ) [sponge material (hardness 110 to 140 N, density 15 to 50 kg/m ³ )] and dried for 24 hours. All painting and drying were performed under standard conditions. By the above method, a highly aesthetically pleasing decorative coating surface with contrast and a mixture of pale gray areas and white areas was obtained. Note that the coating amount is a value in terms of solid content (the same applies hereinafter).

(Example 2)
As the first step, coating material 2-1 is applied to the entire surface of the base material (slate board) with a coating amount of 120 g/m ² (coating amount 48 g/m ² ) using a roller (using a fibrous roller). It was dried for 2 hours until it was more than dry to the touch. Next, as a second step, coating material 2-2 was applied discontinuously at a coating amount of 50 g/m ² (coating amount 28 g/m ² ) [sponge material (hardness 75 to 110 N, density 15 to 30 kg/m 2 )]. m ³ )] and dried for 24 hours. All painting and drying were performed under standard conditions. By the above method, a highly aesthetically pleasing decorative coating surface with contrast and a mixture of dark gray areas and black areas was obtained.

(Example 3)
As the first step, coating material 2-1 is applied to the entire surface of the base material (slate board) with a coating amount of 120 g/m ² (coating amount 48 g/m ² ) using a roller (using a fibrous roller). It was dried for 2 hours until it was more than dry to the touch. Next, as a second step, coating material 2-2 was applied discontinuously with a roller at a coating amount of 50 g/m ² (coating amount 28 g/m ² ). Use a roller. Sponge material 3a: hardness 45-60N, density 50-100kg/m ³ , sponge material 3b: hardness 75-110N, density 15-30kg/m ³ , sponge material 3c: hardness 110-140N, Density 15 to 50 kg/m ³ , Sponge material 3d: Hardness 110 to 300 N, Density 30 to 85 kg/m ³ Sponge material 3e: Hardness 1000 to 1500 N, Density 10 to 20 kg/m ³ ), Dry for 24 hours. . All painting and drying were performed under standard conditions. By the above method, a highly aesthetically pleasing decorative coating surface with contrast and a mixture of dark gray areas and black areas was obtained.

(Example 4)
As a first step, coating material 3-1 was diluted with water at a dilution ratio of 15% (viscosity after dilution: 3 Pa・s, heating residue after dilution: 61% by weight) on the base material (slate board), and then coated. The entire surface was coated with a roller (using a fibrous roller) with an application amount of 120 g/m ² (coating amount 73.2 g/m ² ), and dried for 2 hours until it was dry to the touch or better. Next, as a second step, the coating material 3-2 was diluted with water at a dilution ratio of 5% (viscosity after dilution: 5 Pa·s, heating residue after dilution: 67% by weight), and the coating amount was 50 g/m ² ( Sponge material ^2a : Hardness 45-60N, Density 50- 100kg/m ³ , sponge material 2b: hardness 75-110N, density 15-30kg/m ³ , sponge material 2c: hardness 110-140N, density 15-50kg/m ³ , sponge material 2d: hardness 110-300N , density 30 to 85 kg/m ³ , sponge material 2e: hardness 1000 to 1500 N, density 10 to 20 kg/m ³ ), and dried for 24 hours. All painting and drying were performed under standard conditions. By the above method, a highly aesthetically pleasing decorative coating surface with contrast and a mixture of white areas and beige areas was obtained.

In each of Examples 1 to 4, two types of colored regions, the coating formed in the first step and the coating discontinuously formed in the second step, coexist, resulting in a highly aesthetically pleasing decorative coating surface with contrast. was gotten. In particular, in Examples 3 and 4, the boundaries between the colored areas could be made into a more complex non-linear shape (intricate pattern), and a decorative coating surface with even higher finish and aesthetic appearance was obtained.

Claims (3)

A method for forming a decorative coating surface in which at least two or more types of colored regions coexist, the method comprising:
Using at least two types of coating materials with a color difference (△E) of 3 or more,
All of the above coating materials have a heating residue of 25% by weight or more,
On the surface to be coated,
A first step of applying a first coating material, a second step of applying a second coating material,
The viscosity of the first coating material and the second coating material is 0.1 to 10 Pa·s,
The viscosity of the second coating material is higher than that of the first coating material,
The difference in viscosity between the first coating material and the second coating material is 1 to 8 Pa·s,
After the first coating material becomes non-fluid, applying the second coating material discontinuously using a roller or a pressing tool having a sponge material,
A method for forming a decorative coating surface, wherein the sponge material is a mixture of at least five types of sponge materials having different hardnesses and/or densities. 2. The method for forming a decorative coating surface according to claim 1, wherein the first coating material is applied to the entire surface. 2. The method for forming a decorative coating surface according to claim 1, wherein the first coating material is applied discontinuously to the surface to be coated using a sponge material.