JP5689343B2 - Painting method - Google Patents

Description

  The present invention relates to a coating method for providing a spotted pattern on a wall surface.

  Conventionally, inorganic building materials such as siding boards and ALC plates have been widely used as materials constituting the wall surfaces of buildings. In the coating of such inorganic building materials, a technique of applying a spotted pattern on the surface is adopted in order to enhance the design. For example, Patent Document 1 describes a method of forming a speckled pattern by using a color paint prepared to have a specific viscosity and spray-coating while controlling a pattern at the time of painting, a discharge amount, and the like. Patent Document 2 describes a method in which after a base paint is applied, a colored paint different in color from the base paint is applied unevenly.

  However, each of these methods relates to a coating method in a factory, and a spotted pattern is given by sputter coating while mechanically controlling a colored paint. For inorganic building materials installed as wall materials at the construction site, it will need to be repainted due to deterioration over time, but it is desirable to apply the method of the above-mentioned patent document in such construction site painting. It is difficult to stably obtain a spot pattern with a size of 2 mm, and it is currently lacking in practicality.

On the other hand, a method of applying a spotted pattern by spraying a paint in which an aggregate such as silica sand or mica is dispersed in a resin liquid is also known. According to such a method, a spot pattern having a desired size can be obtained by setting the particle size of the aggregate to be used.
However, with such a paint containing aggregate, the aggregate is likely to rebound or scatter during spray coating, and it is difficult to reliably adhere the aggregate to the surface to be coated. That is, it is difficult to control the density of the formed spots, which is not very practical.

Japanese Patent Laid-Open No. 3-186281 Japanese Utility Model Publication No. 4-77440

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a simple coating method for providing a stable spot pattern on an existing wall surface in a construction site.

  As a result of intensive studies to achieve the above object, the present inventor has applied a specific undercoat material and then applied a top coat material containing light colored particles having a specific bulk density and particle diameter as essential components. The present invention has been completed.

  That is, the present invention has the following characteristics.

1. After painting a primer on the wall, spraying the top coat
As the primer, a colored paint that forms a paint film with a pencil hardness of 2H or less,
As the coating material, the synthetic resin emulsion (a) and light colored particles (b) having a bulk density of 0.8 g / ml or less and an average particle diameter of 0.01 mm to 1 mm are essential components, and the synthetic resin emulsion. A coating method comprising using a coating material containing 0.1 to 50 parts by weight of the light-weight colored particles (b) with respect to 100 parts by weight of the solid content of (a).
2. The top coat material has a viscosity of 0.1 to 15 Pa · s and a thixotropy index of 6.0 or less. The painting method described.

  ADVANTAGE OF THE INVENTION According to this invention, the stable spot pattern can be formed with respect to the existing wall surface in a construction site, and the finish with high aesthetics can be obtained simply.

  Hereinafter, modes for carrying out the present invention will be described.

  The surface to be coated in the present invention is a wall surface of a building, a civil engineering structure, etc., and examples of the material constituting the wall surface include concrete, mortar, cement board, extruded plate, slate plate, PC plate. ALC board, fiber reinforced cement board, metal siding board, ceramic siding board, ceramic board, calcium silicate board, plaster board, plastic board, hard wood cement board, PVC extrusion siding board, plywood and the like. These may have been subjected to some kind of surface treatment (filler treatment, putty treatment, surfacer treatment, sealer treatment, etc.), or may already have a coating film, or have a wallpaper attached thereto. .

  In addition, such a wall surface has a joint pattern due to a linear recess, for example, a wall surface composed of ceramic tiles, a coating film surface provided with a texture having a joint pattern, or an inorganic building material having a joint pattern. It may be a configured wall surface or the like.

In the present invention, a colored paint for forming a coating film having a pencil hardness of 2H or less is applied as an undercoat material to the above-described wall surface. In the present invention, by using such an undercoating material, it is possible to suppress problems such as scattering and rebounding of light colored particles during coating of an overcoating material. That is, the undercoat material of the present invention contributes to the formation stability of the spotted pattern and the improvement in aesthetics due to the spotted pattern.
The pencil hardness of the primer used in the present invention is 2H or less, preferably H or less, more preferably F or less. The lower limit of the pencil hardness of the primer is preferably 4B or more, more preferably 3B or more. If the pencil hardness of the undercoat material is within such a range, cracking of the topcoat material coating film can be sufficiently prevented, and the aesthetic appearance of the speckled pattern can be maintained for a long time.
The pencil hardness is measured according to the method of JIS K5600-5-4. As the test plate, an aluminum plate coated with a primer and dried in a standard state (temperature 23 ° C., relative humidity 50%) for 14 days is used.

As the colored paint, a paint containing a binder and a color pigment as essential components and satisfying the above conditions may be used.
Among these, examples of the binder include acrylic resin, urethane resin, epoxy resin, vinyl acetate resin, silicon resin, fluorine resin, acrylic vinyl acetate resin, acrylic urethane resin, acrylic silicon resin, and the like. Two or more types can be used. As the synthetic resin, an aqueous resin such as a water-dispersible resin (resin emulsion) or a water-soluble resin is suitable.
The glass transition temperature of the binder is preferably 50 ° C. or lower, more preferably −50 to 40 ° C. In addition, a glass transition temperature is a value calculated | required from the calculation formula of FOX.

  Examples of the coloring pigment include titanium oxide, zinc oxide, carbon black, graphite, black iron oxide, copper chrome black, cobalt black, copper manganese iron black, brown, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene. Use red, quinacridone red, yellow iron oxide, titanium yellow, first yellow, benzimidazolone yellow, chrome green, cobalt green, phthalocyanine green, ultramarine, bitumen, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, etc. Can do. The color tone of the colored paint can be appropriately set by adjusting the type, mixing amount, and the like of such a color pigment.

The colored paint used as the undercoat material is, for example, an extender pigment, a leveling agent, a wetting agent, a film-forming aid, a plasticizer, an antifreezing agent, an antiseptic, an antifungal agent, It may contain an anti-algae agent, an antibacterial agent, a matting agent, a dispersant, an adsorbent, an ultraviolet absorber, an antioxidant, a light stabilizer, a catalyst, a crosslinking agent, and the like.
When the extender is included in the colored paint, the total amount of the pigment combined with the colored pigment is 60% or less (preferably 50% or less, more preferably 40% or less, more preferably 30% or less) in terms of pigment volume concentration. It is desirable to do. With such a pigment volume concentration, it is easy to obtain a colored paint having a desired hardness.

A known method can be employed for the application of the colored paint. As a coating method, for example, spray coating, roller coating, brush coating, and the like are possible. The amount of the colored paint applied is usually about 0.05 to 0.5 kg / m ² although it depends on the form of the paint. At the time of coating, a diluent such as water can be mixed to appropriately adjust the viscosity. The colored paint is usually dried at room temperature.

  In the application of the colored paint, the entire wall surface can be applied with one kind (one color) of the colored paint, or two or more kinds of colored paints having different color tones can be applied.

  When the wall surface to be coated has a joint pattern with linear recesses, it is possible to paint different colors in the linear recesses and other portions. Such coating is performed by coating a colored paint (first colored paint) appearing in the linear recess on the entire surface, and then using a colored paint (second colored paint) different from the paint in the portion other than the linear recess. Can be carried out by a method such as roller coating.

In the present invention, after the coating film of the colored paint is dried, the top coating material is applied.
The topcoat material in the present invention comprises a synthetic resin emulsion (a) and specific lightweight colored particles (b) as essential components. In the present invention, a stable spot pattern can be formed by using such a top coating material. The final finished appearance has a coating film color of a colored paint as a background, and a spotted pattern made of lightweight colored particles (b) is added thereto.

  The overcoating material of the present invention is usually applied by spraying. At this time, the light colored particles contained in the overcoating material reach the coated surface without being scattered unnecessarily, and reach the coated surface. When this happens, problems such as rebound are unlikely to occur. That is, in the top coating material of the present invention, the light-colored colored particles can be reliably applied to the surface to be coated, and a spot pattern with high aesthetics can be stably formed. Further, the light colored particles in the top coating material contribute to the improvement of the tactile sensation and texture of the spotted pattern based on the characteristics thereof.

When solid particles other than the light-colored colored particles in the present invention, such as silica sand, mica, etc., are used, they are likely to rebound from the coated surface and may be incompletely adhered to the coated surface. It is difficult to obtain a spotted pattern. On the other hand, when trying to paint ordinary colored paint in spots, it is difficult to control the scattering of the paint, and various spot patterns with different sizes are formed. Cheap.
On the other hand, in the present invention, since a specific undercoat material is used and specific light-colored colored particles are used as the spotted pattern forming particles in the overcoat material, it is possible to solve such a problem of the conventional method.

  Of the components constituting the top coating material, the synthetic resin emulsion (a) (hereinafter referred to as “component (a)”) acts as a binder. (A) As a component, what can form a transparent film normally is used. Specific examples of the component (a) include a vinyl acetate resin emulsion, an epoxy resin emulsion, an acrylic resin emulsion, a urethane resin emulsion, an acrylic silicon resin emulsion, a fluororesin emulsion, and a composite system thereof. . These can be used alone or in combination of two or more. These synthetic resin emulsions may have crosslinking reactivity.

As the lightweight colored particles (b) (hereinafter also referred to as “component (b)”) in the top coat material, those having a bulk density of 0.8 g / ml or less and an average particle diameter of 0.01 mm or more and 1 mm or less are used.
When the bulk density of the component (b) exceeds 0.8 g / ml, it becomes difficult to suppress rebound from the surface to be coated during coating. In addition, it is difficult to improve the texture of the spotted pattern.
The bulk density of component (b) is usually 0.8 g / ml or less, preferably 0.01 g / ml or more and 0.5 g / ml or less, more preferably 0.05 g / ml or more and 0.4 g / ml or less. When the bulk density of the component (b) is within such a range, the dispersion uniformity of the component (b) in the top coating material is also increased, which is preferable from the viewpoint of the effects of the present invention. The bulk density in the present invention is a value measured by supplying lightweight colored particles to a cylindrical container and applying vertical vibration (tapping vibration) until the bulk change of the lightweight colored particles in the container is completed.

When the average particle diameter of (b) component is smaller than 0.01 mm, a spot pattern becomes difficult to be recognized in the finished surface after coating. Moreover, when the average particle diameter of (b) component is larger than 1 mm, the convex shape of a spot part will become conspicuous, and it will be disadvantageous in terms of finish, aesthetics, etc. Moreover, there is a possibility that the paint workability may be lowered.
The average particle size of the component (b) is preferably 0.02 mm to 0.5 mm, more preferably 0.03 mm to 0.3 mm.

Although the shape of (b) component is not specifically limited, A granular thing is suitable in this invention. The term “granularity” as used herein refers to a shape that shows an approximate value of the average particle diameter and the average thickness. Specifically, as the component (b), those having an average particle diameter to average thickness ratio (average particle diameter / average thickness) of 2 or less (preferably 1.5 or less) are suitable. By using a thing of such a shape, the application | coating to a to-be-coated surface becomes reliable, a good-quality spot pattern is formed, and the aesthetics of a formed coating film can be improved. When the ratio between the average particle diameter and the average thickness is too large, the coating state tends to be uneven, and the aesthetics may be insufficient.
In addition, the average particle diameter in this invention is an average value of a long diameter when the particle | grains put on the horizontal surface with the most stable attitude | position are observed from upper direction. The average thickness is the average value of the interplanar spacing when particles placed on a horizontal plane in the most stable posture are sandwiched between horizontal planes.

As the component (b) in the top coating material, it is desirable to use a component having a different color from the colored paint. Thereby, it becomes possible to visually recognize the spotted pattern due to the component (b) on the finished surface after painting. When two or more types of colored paints are used before coating the top coat material, the color tone of component (b) may be different from that of at least one type of colored paint.
In addition, the different color in this invention means the thing of the grade which can recognize a mutual color tone as a different color visually. Usually, the color difference (ΔE) may be set to 5 or more (preferably 10 or more, more preferably 20 or more).

As such a component (b), for example, a rubber, resin, mineral, etc., or a plant based on plants such as cork can be used. In the present invention, organic particles based on rubber or resin are particularly suitable, and expanded organic particles having voids inside the particles can also be used.
Examples of the foamed organic particles include foamed rubber particles. The foamed rubber particles can be obtained, for example, by crushing a foamed rubber body obtained by foaming a mixture of various rubber components, a vulcanizing agent, a pigment and the like. The rubber component is not particularly limited, and examples thereof include natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, high styrene rubber, acrylonitrile rubber, chloroprene rubber, and ethylene propylene rubber. In the present invention, the crushed foamed rubber body can be used as it is, but a coloring treatment or the like can also be performed as necessary.

  Component (b) is mixed in an amount of 0.1 to 50 parts by weight (preferably 0.5 to 30 parts by weight, more preferably 1 part by weight per 100 parts by weight of component (a). Part to 20 parts by weight). When the amount of component (b) is too large, the lower colored coating film tends to be concealed, which is disadvantageous in terms of spotted pattern formation. In addition, the particles during coating are likely to rebound, drop off, and spotted pattern irregularities are likely to occur. On the other hand, when the component (b) is too small, a large amount of the overcoat material must be applied repeatedly to give a spotted pattern, and the texture of the spotted part may be impaired.

  The topcoat material in the present invention may be one containing one kind (one color) of light-colored colored particles, but may contain two or more kinds of light-colored colored particles having different color tones as necessary.

The top coating material in the present invention is, for example, a leveling agent, a wetting agent, a film-forming aid, a plasticizer, an antifreezing agent, an antiseptic agent, an antifungal agent, an anti-algae agent, an antibacterial agent within the range that does not impair the effects of the present invention. An agent, a matting agent, a dispersant, an adsorbent, an ultraviolet absorber, an antioxidant, a light stabilizer, a catalyst, a crosslinking agent, and the like may be included.
Further, if the coating color of the colored paint is visible in the final finished appearance, the top coating material may contain a coloring pigment or the like. The ratio of the colored pigment in the top coating material is preferably 3% by weight or less, more preferably 1% by weight or less, and even more preferably 0.5% by weight or less. The average particle diameter of the color pigment is usually about 5 μm or less (preferably 2 μm or less).

The topcoat material in the present invention is preferably prepared so that the viscosity at the time of coating is 0.1 to 15 Pa · s and the thixotropy index is 6.0 or less. In the present invention, by setting the viscosity characteristics of the top coating material to such conditions, the effect of suppressing the rebound of the light colored particles during coating is enhanced, which is preferable in terms of improving the coating workability and finishing performance.
The viscosity of the top coating material is preferably 0.5 to 10 Pa · s, more preferably 1 to 8 Pa · s. The thixotropy index is preferably 5.0 or less, more preferably 4.5 or less. The lower limit of the thixotropy index is usually 1.0 or more (preferably 2.0 or more).
In addition, the viscosity in this invention is a value calculated | required by measuring the viscosity (guide value of the 4th rotation) in 20 rpm by a BH type viscometer. The thixotropy index (TI) is a value determined by the following formula using a BH viscometer. In either case, the measurement temperature is 23 ° C.
<Formula> TI = η1 / η2
(Where η1 is the viscosity at 2 rpm (Pa · s: guide value for the second rotation). Η2 is the viscosity at 20 rpm (Pa · s: guide value for the fourth rotation))

  In the present invention, a viscosity adjusting agent can be used in order to adjust the viscosity characteristics of the top coating material within the above range. Examples of such a viscosity modifier include hydroxyethyl cellulose, polyvinyl alcohol, alkali-soluble emulsion, associative thickener and the like. Of these, associative thickeners are preferred in the present invention. As the associative thickener, an ethylene oxide urethane block copolymer is particularly suitable. The mixing ratio of such a viscosity modifier is usually about 0.01 to 3 parts by weight, preferably about 0.05 to 2 parts by weight, in terms of solid content, with respect to 100 parts by weight of the solid content of the synthetic resin emulsion.

The topcoat material in the present invention is usually applied to the entire wall surface, and spray coating is adopted as a coating method. At the time of painting, it is also possible to dilute the topcoat material with water or the like. The coating amount of the top coating material is usually 0.05 to 0.8 kg / m ² , preferably 0.1 to 0.5 kg / m ² . The drying after coating the top coat material may be usually performed at room temperature. The drying time is usually about 1 to 5 hours.
In the present invention, a transparent paint or the like can be applied as necessary after the top coat material is applied.

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

  As the primer, the following colored paints were prepared.

・ Coloring paint 1
A brown colored paint having a pigment volume concentration of 16%, mainly composed of an acrylic resin emulsion (solid content: 50% by weight, glass transition temperature: 19 ° C.), titanium oxide, yellow iron oxide, red pepper, and carbon black. The pencil hardness of the coating film formed with this colored paint 1 was F.

・ Coloring paint 2
A brown colored paint having a pigment volume concentration of 12%, mainly composed of an acrylic silicon resin emulsion (solid content: 50% by weight, glass transition temperature: 24 ° C.), titanium oxide, yellow iron oxide, red pepper, and carbon black. The pencil hardness of the coating film formed with this colored paint 2 was F.

・ Coloring paint 3
A brown colored paint having a pigment volume concentration of 15%, mainly composed of an acrylic resin emulsion (solid content: 50% by weight, glass transition temperature: 12 ° C.), titanium oxide, yellow iron oxide, red pepper, and carbon black. The pencil hardness of the coating film formed with this colored paint 3 was HB.

・ Coloring paint 4
A brown colored paint with a pigment volume concentration of 26%, mainly composed of an acrylic resin emulsion (solid content 50% by weight, glass transition temperature 12 ° C.), titanium oxide, yellow iron oxide, red pepper, carbon black, extender pigment (clay) . The pencil hardness of the coating film formed with this colored paint 4 was F.

・ Coloring paint 5
A brown colored paint having a pigment volume concentration of 15%, mainly composed of a solvent-soluble acrylic resin (solid content: 50% by weight, glass transition temperature: 58 ° C.), titanium oxide, yellow iron oxide, red pepper, and carbon black. The pencil hardness of the coating film formed with this colored paint 5 was 3H.

  The following materials were prepared as the top coating material.

・ Coating material 1
4 black rubber particles 1 (bulk density 0.22 g / ml, average particle diameter 0.20 mm, average particle diameter / average thickness = 1.2) with respect to 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) 1 part by weight, 1 part by weight of viscosity modifier 1 (ethylene oxide urethane block copolymer, solid content 20% by weight), and further mixed with water to prepare a viscosity of 3.6 Pa · s and a thixotropy index of 4.0. Material 1 was obtained.

・ Coating material 2
6 black rubber particles 2 (bulk density 0.31 g / ml, average particle diameter 0.25 mm, average particle diameter / average thickness = 1.2) per 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) Part by weight and 1 part by weight of the viscosity modifier 1 were mixed, and water was further mixed to obtain a top coating material 2 having a viscosity of 4.2 Pa · s and a thixotropy index of 3.8.

・ Coating material 3
Three black rubber particles 3 (bulk density 0.14 g / ml, average particle size 0.25 mm, average particle size / average thickness = 1.3) per 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) Part by weight and 1 part by weight of the viscosity modifier 1 were mixed, and water was further mixed to obtain a top coating material 3 having a viscosity of 4.0 Pa · s and a thixotropy index of 3.9.

・ Coating material 4
10 black resin particles 1 (bulk density 0.69 g / ml, average particle size 0.15 mm, average particle size / average thickness = 1.0) per 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) Part by weight and 1 part by weight of the viscosity modifier 1 were mixed, and water was further mixed to obtain a top coating material 4 having a viscosity of 5.3 Pa · s and a thixotropy index of 4.0.

・ Topcoat 5
Black rubber particles 4 (bulk density 0.53 g / ml, average particle diameter 0.25 mm, average particle diameter / average thickness = 1.4) per 10 parts by weight of acrylic resin emulsion (solid content 50% by weight) Part by weight and 1 part by weight of the viscosity modifier 1 were mixed, and water was further mixed to obtain a topcoat material 5 having a viscosity of 4.1 Pa · s and a thixotropy index of 4.2.

・ Coating material 6
4 black rubber particles 4 (bulk density 0.53 g / ml, average particle size 0.25 mm, average particle size / average thickness = 1.4) with respect to 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) 4 parts by weight and 4 parts by weight of viscosity modifier 2 (cellulose viscosity modifier, solid content 3% by weight) were mixed, and water was further mixed to prepare a viscosity of 3.8 Pa · s and a thixotropy index of 6.4. A top coating material 6 was obtained.

・ Topcoat 7
10 parts by weight of black rubber particles 5 (bulk density 0.52 g / ml, average particle diameter 0.3 mm, average particle diameter / average thickness = 5) per 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) Then, 1 part by weight of the viscosity modifier 1 was mixed, and water was further mixed to obtain a top coating material 7 having a viscosity of 4.2 Pa · s and a thixotropy index of 4.1.

・ Coating material 8
Black rubber particles 6 (bulk density 0.28 g / ml, average particle diameter 1.2 mm, average particle diameter / average thickness = 1.3) are added to 200 parts by weight of the acrylic resin emulsion (solid content 50% by weight). Part by weight and 1 part by weight of the viscosity modifier 1 were mixed, and water was further mixed to adjust the viscosity to 3.7 Pa · s and the thixotropy index to 3.8 to obtain a top coating material 8.

・ Topcoat 9
20 weight parts of black colored silica sand (bulk density 1.2 g / ml, average particle diameter 0.25 mm, average particle diameter / average thickness = 1.2) with respect to 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) Part and 1 part by weight of viscosity modifier 1 were mixed, and water was further mixed to obtain a topcoat material 9 having a viscosity of 4.0 Pa · s and a thixotropy index of 4.1.

・ Coating material 10
10 weights of black scaly resin pieces (bulk density 0.73 g / ml, average particle diameter 1.2 mm, average particle diameter / average thickness = 25) per 200 parts by weight of acrylic resin emulsion (solid content 50% by weight) Part and 1 part by weight of the viscosity modifier 1 were mixed, and water was further mixed to obtain a top coating material 10 having a viscosity of 4.5 Pa · s and a thixotropy index of 3.9.

(Test Example 1)
A wall surface with a plurality of ceramic siding boats was used as a base material to be painted. As the ceramic siding boat, one having a grid joint pattern (linear recess width 10 mm, linear recess depth 5 mm) was used.
The entire surface of the base material was spray-coated with a colored paint 1 as an undercoat material at a coating amount of 0.3 kg / m ² . Then, after curing for 24 hours, the top coating material 1 was spray-coated at a coating amount of 0.3 kg / m ² and cured for 24 hours. The paint workability and finish at this time were confirmed. The above steps were all performed under standard conditions (temperature 23 ° C., relative humidity 50%). The color difference between the rubber particles 1 and the colored paint 1 was 38.
The coating workability was evaluated in four stages (excellent: A>B>C> D: inferior), with “A” indicating that the particles did not rebound and “D” indicating that the particles rebounded. As for the finish, there are four stages (excellent: A>B> C) where “A” indicates that a good spot pattern is formed, and “D” indicates that the spotted unevenness, unevenness, etc. are conspicuous. > D: Inferior).

(Test Example 2)
The test was performed in the same manner as in Test Example 1 except that the topcoat material 2 was used instead of the topcoat material 1. The color difference between the rubber particles 2 and the colored paint 1 was 35.

(Test Example 3)
A test was performed in the same manner as in Test Example 1 except that the topcoat material 3 was used instead of the topcoat material 1. The color difference between the rubber particles 3 and the colored paint 1 was 38.

(Test Example 4)
The test was performed in the same manner as in Test Example 1 except that the top coating material 4 was used instead of the top coating material 1. The color difference between the resin particles 1 and the colored paint 1 was 33.

(Test Example 5)
The test was performed in the same manner as in Test Example 1 except that the topcoat material 5 was used instead of the topcoat material 1. The color difference between the rubber particles 4 and the colored paint 1 was 39.

(Test Example 6)
The test was performed in the same manner as in Test Example 1 except that the top coating material 6 was used instead of the top coating material 1. The color difference between the rubber particles 4 and the colored paint 1 was 39.

(Test Example 7)
The test was performed in the same manner as in Test Example 1 except that the topcoat material 7 was used instead of the topcoat material 1. The color difference between the rubber particles 5 and the colored paint 1 was 39.

(Test Example 8)
The test was performed in the same manner as in Test Example 1 except that the colored paint 2 was used instead of the colored paint 1 as the primer. The color difference between the rubber particles 1 and the colored paint 2 was 39.

(Test Example 9)
The test was performed in the same manner as in Test Example 1 except that the colored paint 3 was used instead of the colored paint 1 as the primer. The color difference between the rubber particles 1 and the colored paint 3 was 38.

(Test Example 10)
The test was performed in the same manner as in Test Example 1 except that the colored paint 4 was used instead of the colored paint 1 as the primer. The color difference between the rubber particles 1 and the colored paint 4 was 40.

(Test Example 11)
The test was performed in the same manner as in Test Example 1 except that the topcoat material 8 was used instead of the topcoat material 1. The color difference between the rubber particles 6 and the colored paint 1 was 40.

(Test Example 12)
A test was performed in the same manner as in Test Example 1 except that the topcoat material 9 was used instead of the topcoat material 1. The color difference between the colored silica sand and the colored paint 1 was 38.

(Test Example 13)
The test was performed in the same manner as in Test Example 1 except that the topcoat material 10 was used instead of the topcoat material 1. The color difference between the scale-like resin pieces and the colored paint 1 was 32.

(Test Example 14)
The test was performed in the same manner as in Test Example 1 except that the top coat material 6 was used as the top coat material 1 and the colored paint 5 was used as the undercoat material. The color difference between the rubber particles 4 and the colored paint 5 was 39.

(Test Example 15)
The test was performed in the same manner as in Test Example 1 except that the topcoat material 10 was used as the topcoat material 1 and the colored paint 5 was used as the undercoat material. The color difference between the scaly resin pieces and the colored paint 5 was 32.

  Test results are shown in Tables 1-2. In Test Examples 1 to 10, good results were obtained.

Claims (2)

After painting a primer on the wall, spraying the top coat
As the primer, a colored paint that forms a paint film with a pencil hardness of 2H or less,
The colored paint comprises a binder and a colored pigment;
The glass transition temperature of the binder is 50 ° C. or less,
The pigment volume concentration of the colored paint is 60% or less,
As the coating material, the synthetic resin emulsion (a) and light colored particles (b) having a bulk density of 0.8 g / ml or less and an average particle diameter of 0.01 mm to 1 mm are essential components, and the synthetic resin emulsion. A coating method comprising using a coating material containing 0.1 to 50 parts by weight of the light-weight colored particles (b) with respect to 100 parts by weight of the solid content of (a). The coating method according to claim 1, wherein the top coating material has a viscosity of 0.1 to 15 Pa · s and a thixotropy index of 6.0 or less.