Film formation method

Abstract

To provide a coat formation method for applying a homogenous dotted pattern by roller coating on an existing wall surface at a construction site, etc.SOLUTION: The invention is a coat formation method for applying a coating material by roller coating on a wall surface. Synthetic resin emulsion (m) and light-weight coloring particle (n) having bulk density of 1.0 g / ml or less and average particle diameter of 0.01 to 1 mm are essential components of the coating material. The coating material containing 0.1 to 50 parts by weight of the light-weight coloring particle (n) is used for a solid content of 100 parts by weight of the synthetic resin emulsion (m). A fibrous roller having hair length of 10 mm or longer is used as the roller.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a novel method for forming a coating. [Background technology]

[0002] Conventionally, inorganic building materials such as siding boards and ALC boards have been widely used as materials for constructing the walls of buildings. When painting such inorganic building materials, techniques such as applying a speckled pattern to the surface have been adopted to enhance their design. For example, Patent Document 1 describes a method of forming a speckled pattern by spray painting using a colored coating material prepared to a specific viscosity while controlling the pattern and discharge amount during painting. Furthermore, Patent Document 2 describes a method of applying a base coating material and then unevenly applying a colored coating material of a different color from the base coating material.

[0003] However, these techniques all relate to painting methods performed in factories, and the speckled pattern is created by mechanically controlling the colored paint and sputtering. Inorganic building materials installed as wall materials at construction sites deteriorate over time and require repainting. However, even if the techniques described in the above patent documents are applied to painting at such construction sites, it is difficult to consistently obtain speckled patterns of the desired size, making them impractical at present.

[0004] On the other hand, a method of applying a speckled pattern to inorganic building materials by applying a topcoat material in which aggregates such as silica sand and mica are dispersed in a resin liquid is also known. According to this method, a speckled pattern of the desired size can be obtained by setting the particle size of the aggregate used. For example, Patent Document 3 describes a method of applying a clear topcoat material containing flat coloring materials such as mica on a multi-layered multi-colored pattern coating film. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 3-186381 [Patent Document 2] Japanese Utility Model Application Publication No. 4-77440 [Patent Document 3] Patent No. 6180678 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when using a roller as a painting tool to apply a topcoat containing aggregates such as silica sand and mica, as described above, the aggregates tend to clump together on the surface to be painted, which can result in uneven spot patterns and make it difficult to obtain a uniform spot pattern.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a coating forming method for applying a uniform speckled pattern to an existing wall surface at a construction site or the like by roller coating. [Means for solving the problem]

[0008] As a result of intensive research into achieving the above-mentioned objective, the inventor came up with the idea of ​​a method of painting a wall surface with a specific topcoat material, the essential component of which is lightweight colored particles having a specific bulk density and particle size, using a specific roller, and thus completed the present invention.

[0009] That is, the present invention has the following features. 1. A coating formation method in which a topcoat material is applied to a wall surface by roller coating, The above-mentioned topcoat material is a synthetic resin emulsion (m), and a bulk density of 1.0 g / ml or less, an average particle diameter of 0.01 to 1 mm, and a ratio of the average particle diameter to the average thickness. 1.0~1.5 The synthetic resin emulsion (m) contains, as an essential component, granular lightweight coloring particles (n) as follows: granular A topcoat material containing 0.1 to 50 parts by weight of lightweight colored particles (n) is used, As a roller , hair length 18 ~38mm Use a fiber roller A coating forming method characterized by: 2. The coating formation method described in 1., characterized in that after applying a primer and / or intermediate coating material to the wall surface, the top coating material is applied by roller coating. [Effects of the Invention]

[0010] According to the present invention, a uniform spotted pattern can be formed on an existing wall surface at a construction site or the like by roller painting, and a highly aesthetic finish can be easily obtained. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram showing an example of a fibrous roller. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described.

[0013] The coating surface to be coated in the present invention is an existing wall surface of a building, civil engineering structure, or the like. Examples of substrates constituting the wall surface include concrete, mortar, cement board, extruded board, slate board, PC board, ALC board, fiber-reinforced cement board, metal siding board, ceramic siding board, ceramic board, calcium silicate board, gypsum board, plastic board, hardwood cement board, PVC extruded siding board, plywood, etc., as well as materials having a coating film on their surface. The present invention is particularly suitable for existing wall surfaces composed of inorganic building materials such as siding boards and ALC boards. When a wall surface is composed of multiple inorganic building materials, the joints between the inorganic building materials may be filled with a joint material such as a sealant or a dry joint material.

[0014] In the present invention, the undercoat material and / or intermediate coating material can be applied to the wall surface as described above before the topcoat material is applied.

[0015] Among these, the primer can be one having at least one function selected from adhesion, water resistance, substrate reinforcement, hiding power, base adjustment, base conformability, etc. Examples of such primers include fillers, surfacers, sealers, primers, etc. In the present invention, one or more primers can be used as needed.

[0016] As the intermediate coating material, for example, a material having color-developing properties can be used. By using such an intermediate coating material, the desired color can be imparted to the surface to be coated before the topcoat is applied. The intermediate coating material may further have at least one function selected from, for example, weather resistance, durability, heat insulation, hiding power, waterproofing, etc. If the intermediate coating material has sufficient performance, such as adhesion to the surface to be coated, the application of a primer is not necessary.

[0017] The intermediate coating material may contain, for example, a binder and a coloring pigment. Examples of binders include various resins such as acrylic resin, urethane resin, epoxy resin, vinyl acetate resin, silicone resin, fluororesin, acrylic vinyl acetate resin, acrylic urethane resin, acrylic silicone resin, and composite resins thereof. These may be used alone or in combination of two or more. Preferred binders include aqueous resins such as water-dispersible resins (resin emulsions) and water-soluble resins. The glass transition temperature of the binder (the value calculated using the FOX formula) is preferably 60°C or lower, more preferably -50 to 50°C. In the present invention, "α to β" is synonymous with "α or higher and β or lower."

[0018] Examples of color pigments include titanium oxide, zinc oxide, alumina, carbon black, graphite, black iron oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, ferric oxide (red iron oxide), molybdate orange, permanent 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 blue, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, aluminum pigments, and pearl pigments. These can be used alone or in combination. The color tone of the intermediate coating can be adjusted by appropriately using one or more of these color pigments. The average particle size of the color pigment is preferably 2 μm or less, more preferably 0.01 to 1 μm. The average particle size of the pigment is an average value measured using a laser diffraction particle size distribution measuring device (measurement temperature: 25°C).

[0019] In addition to the above-mentioned components, the intermediate coating material may contain, for example, extender pigments, dyes, aggregates, color particles, matting agents, thickeners, wetting agents, leveling agents, antifreeze agents, film-forming aids, preservatives, antifungal agents, anti-algae agents, antibacterial agents, dispersants, surfactants, antifoaming agents, UV absorbers, light stabilizers, antioxidants, adhesion-imparting agents, stain-reducing agents, hydrophilizing agents, water repellents, crosslinking agents, curing agents, curing accelerators, plasticizers, coupling agents, adsorbents, pH adjusters, catalysts, water, solvents, etc. The intermediate coating material can be produced by uniformly mixing these components using conventional methods.

[0020] The pigment volume concentration (PVC) of the intermediate coating material is preferably 50% or less, more preferably 30% or less, even more preferably 5-28%, and especially preferably 8-25%. The use of such intermediate coating materials is advantageous in terms of substrate conformability (such as conformability to wall surfaces with joints filled with sealant, etc.) and the ability to utilize the texture of the coated surface. The pigment volume concentration is the volume percentage of pigment contained in the dried coating, and is calculated from the mixed amounts of resin and pigment that make up the intermediate coating material. The specific gravity of the resin is assumed to be 1.

[0021] A known method can be used to apply the intermediate coating material. Examples of application methods include spray coating, roller coating, and brush coating. In the case of roller coating, a fibrous roller is preferably used. The amount of intermediate coating material applied is preferably 0.05 to 0.8 kg / m. 2 , more preferably 0.1 to 0.6 kg / m 2 When applying, the viscosity can be adjusted appropriately by adding a diluent such as water. The intermediate coating material is preferably dried at room temperature (0 to 40°C). When the intermediate coating material is applied, the top coating material can be applied after the intermediate coating film has dried.

[0022] When applying intermediate coatings, the entire wall surface can be painted with one type (one color) of intermediate coating, or two or more intermediate coatings with different color tones can be used. In the latter case, for example, a multicolor pattern containing two or more colors can be formed by applying a first intermediate coating to the entire surface and then applying a second intermediate coating (a different color from the first intermediate coating) to specific areas, or by applying the first intermediate coating and the second intermediate coating to specific areas. In the present invention, applying such intermediate coatings allows for a finish that makes use of the texture of the surface while imparting the desired color to the surface.

[0023] The intermediate coating film formed by painting the intermediate coating material may be either glossy or matte (including 70% gloss, 50% gloss, 30% gloss, etc.).

[0024] In the present invention, a topcoat material is applied to a wall surface as described above using a roller. The topcoat material in this invention contains a synthetic resin emulsion (m) and specific lightweight colored particles (n) as essential components, and the roller used to apply the topcoat material is a fibrous roller with a specific bristle length. In this invention, by applying such a specific topcoat material with a specific roller, it is possible to form a uniform spotted pattern. The final finished appearance is a background color (the color of the surface before the topcoat material is applied; if an intermediate coat is applied, the color of the intermediate coat film) with a spotted pattern created by the lightweight colored particles (n), resulting in excellent design.

[0025] Among the components constituting the topcoat material, the synthetic resin emulsion (m) (hereinafter also referred to as "(m) component") acts as a binder. As the (m) component, those that form a transparent coating can be used. Specific examples of the (m) component include vinyl acetate resin emulsion, epoxy resin emulsion, acrylic resin emulsion, urethane resin emulsion, acrylic silicone resin emulsion, fluororesin emulsion, etc., or composite resin emulsions thereof. Among these, from the viewpoint of weather resistance, etc., acrylic resin emulsion, urethane resin emulsion, acrylic silicone resin emulsion, fluororesin emulsion, etc., or composite resin emulsions thereof, etc. are preferred. These (m) components can be used in one or more types, and two or more (m) components can also be mixed. The (m) component may have crosslinking reactivity.

[0026] The component (m) can be produced, for example, by a single-stage or multi-stage (two-stage, three-stage or more) emulsion polymerization method, etc. When multi-stage emulsion polymerization is employed, for example, a multilayer structure emulsion (such as a core-shell emulsion) can be obtained.

[0027] The average particle size of component (m) is preferably 30 to 500 nm, more preferably 50 to 300 nm. The average particle size of component (m) can be measured using a dynamic light scattering measurement device (measurement temperature: 25°C). The glass transition temperature of the resin constituting component (m) is preferably -30 to 80°C, more preferably -20 to 60°C. The glass transition temperature can be calculated using the Fox formula.

[0028] The lightweight colored particles (n) (hereinafter referred to as "(n) component") in the topcoat material have a bulk density of 1.0 g / ml or less and an average particle diameter of 0.01 to 1 mm. As the (n) component, one or more types of lightweight colored particles that meet these conditions can be used.

[0029] The bulk density of component (n) is 1.0 g / ml or less, preferably 0.01 to 0.95 g / ml, more preferably 0.1 to 0.9 g / ml, and even more preferably 0.2 to 0.8 g / ml. Having a bulk density of component (n) within the above range enables the formation of a uniform spotted pattern, which is also advantageous in terms of coating workability. If the bulk density of component (n) exceeds the above upper limit, the particles are likely to gather together on the surface to be coated during roller coating, which may result in uneven spotted patterns. The bulk density in the present invention is a value measured by supplying lightweight colored particles to a cylindrical container and applying up-and-down vibration (tapping vibration) until the bulk change of the lightweight colored particles in the container is complete.

[0030] The average particle size of component (n) is 0.01 to 1 mm, preferably 0.02 to 0.5 mm, and more preferably 0.03 to 0.3 mm. When the average particle size of component (n) is within the above range, a uniform spotted pattern can be formed, which is also advantageous in terms of coating workability. If the average particle size of component (n) is smaller than the above lower limit, the spotted pattern becomes difficult to recognize on the finished surface after coating. If the average particle size of component (n) is larger than the above upper limit, particles tend to clump together or have convex shapes, which is disadvantageous in terms of finish and aesthetics. Furthermore, coating workability may be reduced.

[0031] The shape of component (n) is not particularly limited, but in the present invention, a granular shape is preferred. Here, granular refers to a shape in which the average particle diameter and average thickness are similar. Specifically, component (n) is preferably one in which the ratio of average particle diameter to average thickness (average particle diameter / average thickness) is 2 or less (preferably 1.5 or less). The use of such a shape is even more advantageous in terms of homogenizing the speckled pattern and can improve the aesthetic appearance of the formed coating.

[0032] The average particle size of component (n) is the average long diameter when particles placed on a horizontal surface in the most stable position are observed from above. The average thickness is the average interplanar distance when particles placed on a horizontal surface in the most stable position are sandwiched between two horizontal surfaces.

[0033] It is desirable that the (n) component in the topcoat be a different color from the background color before the topcoat is applied. This allows the speckled pattern caused by the (n) component to be fully visible on the finished surface after painting. If two or more intermediate coats are used to paint different colors before the topcoat is applied, the color tone of the (n) component should be a different color from at least one of the intermediate coats.

[0034] In the present invention, "different colors" refers to colors that can be visually recognized as different from each other. The color difference (ΔE) is preferably 5 or more, more preferably 10 or more, and even more preferably 20 or more. The color difference (ΔE) is measured using a color difference meter. * value, a * value, b * For particles such as component (n), place the particles on a glass plate until the glass surface is covered, and then cover the surface with a PE film (colorless and transparent) and measure the surface.

[0035] As the component (n), for example, those based on rubber, resin, mineral, wood, plant, etc. can be used, and organic particles based on rubber or resin are particularly preferred. The internal structure of such component (n) is not particularly limited as long as the bulk specific gravity, average particle size, etc. satisfy the above-mentioned conditions, and examples thereof include solid bodies, foam bodies, porous bodies, etc. The color tone of component (n) may be, for example, the original color tone of the matrix, or may be imparted by subjecting the matrix to a coloring treatment, etc. (for example, coloring the interior of the matrix, coloring the surface of the matrix, etc.).

[0036] The amount of component (n) mixed is 0.1 to 50 parts by weight, preferably 0.5 to 30 parts by weight, and more preferably 1 to 20 parts by weight, per 100 parts by weight of the solid content of component (m). By keeping the amount of component (n) mixed within this range, it is possible to form a highly aesthetic, uniform spotted pattern in which spots are imparted to the background color. If the amount of component (n) mixed exceeds the above upper limit, the spotted pattern is likely to become uneven and the background color of the underlying layer is likely to be concealed, which is disadvantageous in terms of spotted pattern formation. If the amount of component (n) mixed is less than the above lower limit, the spotted pattern will be difficult to recognize on the finished surface after coating.

[0037] The topcoat material may contain at least one type (one color) of lightweight colored particles, and may contain two or more types of lightweight colored particles with different color tones.

[0038] The topcoat material, within the range that does not inhibit the effects of the present invention, for example, coloring pigments, extender pigments, dyes, matting agents, thickeners, wetting agents, leveling agents, antifreeze agents, film-forming aids, preservatives, antifungal agents, anti-algae agents, antibacterial agents, dispersants, surfactants, antifoaming agents, ultraviolet absorbers, light stabilizers, antioxidants, adhesion-imparting agents, low-staining agents, hydrophilizing agents, water repellents, crosslinking agents, curing agents, curing accelerators, plasticizers, coupling agents, adsorbents, pH adjusters, catalysts, water, solvents, etc. The topcoat material can be manufactured by uniformly mixing such components by conventional methods.

[0039] The heating residue of the topcoat material is preferably 10 to 80% by weight, more preferably 20 to 60% by weight, and even more preferably 30 to 55% by weight. The heating residue can be measured in accordance with the method of JIS K5601-1-2 "heating residue" (heating temperature 135 ° C, heating time 60 minutes).

[0040] The coating formed by the topcoat material is a transparent coating in which the (n) component is dispersed, creating a speckled pattern. In other words, it has transparency that allows the background color before the topcoat material is applied to be visible. The transparent coating formed by the topcoat material may be either colorless and transparent, or colored and transparent, and may be either glossy or matte (including 70% gloss, 50% gloss, 30% gloss, etc.). Of these, colored and transparent coatings can be formed, for example, by topcoat materials containing color pigments, dyes, etc., and the degree of coloring can be set within a range in which the background color and speckled pattern are visible. Matte coatings can be formed, for example, by topcoat materials containing extender pigments, matting agents, etc.

[0041] The topcoat material of the present invention is different from materials known as multicolored pattern paints (multicolored paints), stone-like finish coating materials (stone-like paints), etc. Generally, multicolored pattern paints contain a high proportion of liquid or gel-like color particles, which form a multicolored pattern, while stone-like finish coating materials contain a high proportion of colored aggregates or natural aggregates, which produce a stone-like texture through the coloring of these aggregates. In contrast, the topcoat material of the present invention, as configured as described above, forms a speckled pattern dotted with lightweight colored particles (n). The main color is expressed by the background color.

[0042] In the present invention, the above-mentioned topcoat material is applied by roller coating using a fibrous roller with a bristle length of 10 mm or more. This makes it possible to form a uniform spotted pattern. The reasons for this effect are not limited to the following, but it is believed that the lightweight coloring particles (n) contained in the topcoat material are light and small, making them easy to disperse, and the long fibers of the fibrous roller sufficiently promote the dispersion of these lightweight coloring particles (n) during roller coating, thereby forming a uniform spotted pattern.

[0043] An example of a fibrous roller used in the present invention is shown in Figure 1. The fibrous roller in Figure 1 has a fibrous layer on the outer surface of a cylindrical core. The cylindrical core is hollow so that a handle with a shaft can be attached, and the handle can be attached to the hollow and used. The cylindrical core can be made of, for example, plastic, wood, metal, or paper. In addition, to improve the ease of attachment between the handle shaft and the core, an attachment aid or the like can be provided between the handle shaft and the core. The outer diameter of the fibrous roller is preferably 30 to 80 mm. The length of the fibrous roller is preferably 50 to 300 mm.

[0044] The fibrous roller used in the present invention has a bristle length of 10 mm or more, preferably 12 mm or more, more preferably 15 to 40 mm, even more preferably 18 to 38 mm, and particularly preferably 20 to 36 mm. The bristle length refers to the length of the fibers constituting the fibrous roller. Specifically, the bristle length can be determined by lightly pinching the fibers of a dry fibrous roller with your fingers and stretching them outward from the core material, measuring the length of the fibers, and calculating the average value. In the present invention, a fibrous roller having such a bristle length can be used to apply a topcoat material, thereby forming a uniform spotted pattern. If the bristle length of the fibrous roller is less than the above-mentioned lower limit, it becomes difficult to form a uniform spotted pattern.

[0045] Examples of the fiber material constituting the fibrous layer include pig hair, horse hair, goat hair, sheep hair, raccoon dog hair, human hair, silk, cotton, etc., and synthetic fibers such as acrylic fiber, polyurethane fiber, polyester fiber, polypropylene fiber, etc. The fibrous layer can be formed by knitting or weaving an assembly of such fibers (for example, cotton-like pile, thread-like pile, etc.).

[0046] When applying a topcoat using such a fibrous roller, the viscosity of the topcoat can be set appropriately. The topcoat to be applied can be diluted with water, etc., as necessary. The viscosity of the topcoat (when applied) is preferably 0.1 to 15 Pa·s, more preferably 0.3 to 13 Pa·s. The thixotropy index (when applied) of the topcoat is preferably 6 or less, more preferably 1 to 5. The viscosity is determined by measuring the viscosity at 20 rpm (the index value at the fourth rotation) using a BH-type viscometer. The thixotropy index (TI) is a value determined using the following formula using a BH-type viscometer. The measurement temperature in both cases is 23°C. <Formula>TI=η1 / η2 (In the formula, η1 is the viscosity at 2 rpm (Pa·s: the guideline value at the second rotation). η2 is the viscosity at 20 rpm (Pa·s: the guideline value at the fourth rotation).)

[0047] The topcoat material of the present invention can be applied to the entire wall surface. The amount of topcoat material applied is preferably 50 g / m 2 or more, more preferably 100 to 500 g / m 2 , and more preferably 105 to 400 g / m 2 The number of coats of the topcoat material is preferably 1 to 2 times, more preferably 1 time. By applying the topcoat material under these conditions, a relatively thick film is formed, which further promotes the dispersion of the lightweight colored particles (n), and is more advantageous in terms of forming a uniform spotted pattern.

[0048] Drying after applying the topcoat material may be preferably carried out at room temperature (0 to 40° C.). The drying time is preferably 1 hour or more, preferably about 2 to 24 hours.

[0049] In the present invention, the aesthetic appeal of existing wall surfaces at construction sites and the like can be improved by using the coating formation method described above. The present invention is suitable for repairing (refurbishing) such wall surfaces. By applying the coating formation method of the present invention to wall surfaces that have deteriorated over time, the aesthetic appeal of the wall surface can be improved, and it is possible to restore the color to that of the original construction, or to impart a new color different from that of the original construction. For wall surfaces made of inorganic building materials such as siding boards and ALC panels, and having joints where the joints between the inorganic building materials are filled with a sealant or the like, the method of the present invention can also be applied to the entire surface, including the inorganic building materials and the joints. [Example]

[0050] The following examples and comparative examples will be presented to clarify the features of the present invention, but the present invention is not limited to these examples.

[0051] The following topcoat materials were prepared: ·Top coating material 1 200 parts by weight of synthetic resin emulsion a (acrylic silicone resin emulsion, solid content 50% by weight, glass transition temperature 32 ° C, average particle diameter 110 nm) was mixed with 4 parts by weight of lightweight colored particles a (black resin particles, bulk density 0.68 g / ml, average particle diameter 0.1 mm, average particle diameter / average thickness = 1.0), 12 parts by weight of film-forming aid, 1 part by weight of ultraviolet absorber, 2 parts by weight of viscosity adjuster, and 3 parts by weight of antifoaming agent, and then water was added to adjust the heating residue to 40% by weight, thereby obtaining topcoat material 1.

[0052] ·Top coating material 2 200 parts by weight of synthetic resin emulsion b (acrylic resin emulsion, solid content 50% by weight, glass transition temperature 34 ° C, average particle diameter 150 nm) was mixed with 8 parts by weight of lightweight colored particles b (black resin particles, bulk density 0.68 g / ml, average particle diameter 0.08 mm, average particle diameter / average thickness = 1.0), 12 parts by weight of film-forming aid, 2 parts by weight of viscosity adjuster, and 3 parts by weight of antifoaming agent, and then water was added to adjust the heating residue to 45% by weight, thereby obtaining topcoat material 2.

[0053] ·Top coating material 3 200 parts by weight of synthetic resin emulsion c (acrylic silicone resin emulsion, solid content 50% by weight, glass transition temperature 38 ° C, average particle diameter 100 nm) was mixed with 2 parts by weight of lightweight colored particles c (black resin particles, bulk density 0.69 g / ml, average particle diameter 0.15 mm, average particle diameter / average thickness = 1.0), 12 parts by weight of film-forming aid, 1 part by weight of ultraviolet absorber, 2 parts by weight of viscosity adjuster, and 3 parts by weight of antifoaming agent, and then water was added to adjust the heating residue to 42% by weight, thereby obtaining topcoat material 3.

[0054] ·Top coating material 4 In the above-mentioned topcoat material 1, except that the mixed amount of lightweight colored particles a was 12 parts by weight, topcoat material 4 was obtained in the same manner as topcoat material 1.

[0055] ·Top coating material 5 In the above-mentioned topcoat material 1, except that the mixed amount of lightweight colored particles a was 32 parts by weight, topcoat material 5 was obtained in the same manner as topcoat material 1.

[0056] ·Top coating material 6 In the above-mentioned topcoat material 1, topcoat material 6 was obtained in the same manner as topcoat material 1, except that 4 parts by weight of black silica sand (bulk density 1.2 g / ml, average particle diameter 0.12 mm, average particle diameter / average thickness = 1.2) was mixed in place of lightweight colored particles a.

[0057] ·Top coating material 7 In the above-mentioned topcoat material 1, instead of the lightweight colored particles a, black mica (bulk density 0.40 g / ml, average particle diameter 0.12 mm, average particle diameter / average thickness = 28) was mixed in 4 parts by weight, except that topcoat material 7 was obtained in the same manner as topcoat material 1.

[0058] ·Top coating material 8 200 parts by weight of synthetic resin emulsion a (same as above) was mixed with 4 parts by weight of lightweight colored particles d (white resin particles, bulk density 0.72 g / ml, average particle diameter 0.1 mm, average particle diameter / average thickness = 1.0), 12 parts by weight of film-forming aid, 50 parts by weight of matting agent (uncolored resin particles, average particle diameter 15 μm), 1 part by weight of ultraviolet absorber, 2 parts by weight of viscosity adjuster, and 3 parts by weight of antifoaming agent, and then water was added to adjust the heating residue to 40% by weight, thereby obtaining topcoat material 8.

[0059] ·Top coating material 9 Topcoat material 9 was obtained by mixing 200 parts by weight of synthetic resin emulsion a (same as above), 2 parts by weight of lightweight colored particles a (same as above), 2 parts by weight of lightweight colored particles d (same as above), 12 parts by weight of film-forming agent, 50 parts by weight of matting agent (same as above), 1 part by weight of ultraviolet absorber, 2 parts by weight of viscosity adjuster, and 3 parts by weight of antifoaming agent, and then adding water to adjust the heating residue to 40% by weight.

[0060] The following rollers were prepared: Roller 1 (fiber roller (wool roller), bristle length 25 mm) Roller 2 (fiber roller (wool roller), bristle length 32 mm) Roller 3 (fiber roller (wool roller), bristle length 21 mm) Roller 4 (fiber roller (wool roller), bristle length 13 mm) Roller 5 (fiber roller (wool roller), bristle length 7mm)

[0061] Example 1 Apply 100g / m of primer a (water-based epoxy sealer) to a flat slate board. 2 After drying for 24 hours, intermediate coating material A (light gray glossy synthetic resin emulsion paint, acrylic resin type) was applied at a rate of 150 g / m. 2 After drying for 2 hours, intermediate coating material A was applied again at a rate of 150 g / m. 2 The entire surface was spray painted with 120g / m2 and dried for 24 hours. Next, topcoat material 1 was applied using roller 1. 2The entire surface was then roller-coated with the black resin particles and allowed to dry for 24 hours. All of the above steps were carried out under standard conditions (temperature 23°C, relative humidity 50%). The color difference between the black resin particles and intermediate coating material A was 50.

[0062] The finish of the test specimens obtained by the above method was visually evaluated. The evaluation criteria were 4 levels (excellent: A>B>C>D: poor), with "A" being a uniform speckled pattern formed by the colored particles and "D" being a finish in which the speckled pattern was noticeably uneven due to the colored particles clumping together. The results are shown in Table 1.

[0063] (Examples 2 to 9, Comparative Examples 1 to 3) Instead of roller 1 and topcoat material 1, the roller and topcoat material described in Table 1 were used, except that a test specimen was prepared in the same manner as in Example 1, and the finish was evaluated. The results are shown in Table 1.

[0064] [Table 1]

[0065] Example 10 For a ceramic siding board with a brick-like uneven pattern, a primer b (water-based epoxy surfacer) was applied at a rate of 200 g / m. 2 After drying for 3 hours, intermediate coating material B (black glossy synthetic resin emulsion paint, acrylic silicone resin type) was applied at a rate of 150 g / m. 2 After drying for 2 hours, intermediate coating material B was applied again at a rate of 150 g / m. 2 The entire surface was spray-painted with 100 ml of acrylic resin and dried for 2 hours. Then, using a roller 5, intermediate coating material C (brown glossy synthetic resin emulsion paint, acrylic silicone resin type) was partially painted (application amount 60 g / m 2 ) and dried for 24 hours. Next, using a roller 1, a topcoat material 8 was applied in an amount of 180 g / m 2The entire surface was then roller-coated with the white resin particles and allowed to dry for 24 hours. All of the above steps were carried out under standard conditions (temperature 23°C, relative humidity 50%). The color difference between the white resin particles and intermediate coating material B was 67, and the color difference between the white resin particles and intermediate coating material C was 51.

[0066] The test specimens obtained by the above method were evaluated for finish. The evaluation criteria were as described above. The results are shown in Table 2.

[0067] Example 11 Test specimens were prepared in the same manner as in Example 10, except that topcoat material 9 was used instead of topcoat material 8, and the finish was evaluated. The results are shown in Table 2. The color difference between the white resin particles and intermediate coating material b was 67, the color difference between the white resin particles and intermediate coating material c was 51, the color difference between the black resin particles and intermediate coating material b was 2, and the color difference between the black resin particles and intermediate coating material c was 17.

[0068] (Examples 12 to 14, Comparative Example 4) Instead of roller 1 and topcoat material 8, the roller and topcoat material described in Table 2 were used, except that a test specimen was prepared in the same manner as in Example 10, and the finish was evaluated. The results are shown in Table 2.

[0069] [Table 2]

Claims

1. A coating forming method for roller coating a topcoat material on a wall surface, As the topcoat material, synthetic resin emulsion (m), and bulk density is 1.0 g / ml or less, average particle diameter is 0.01 to 1 mm, average particle diameter and average thickness ratio is 1.0 to 1.5 granular lightweight colored particles (n) are essential components, and the synthetic resin emulsion (m) solids 100 parts by weight, the granular lightweight colored particles (n) are used to contain 0.1 to 50 parts by weight of the topcoat material, Use a fibrous roller with a bristle length of 18 to 38 mm. A coating forming method characterized by:

2. The coating forming method according to claim 1, characterized in that after applying a primer and / or intermediate coating material to a wall surface, the topcoat material is applied by roller coating.

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