Painting method

Abstract

This invention provides a painting method that can easily create a three-dimensional, highly decorative wood grain pattern. [Solution] A painting method for forming a wood grain textured pattern on a surface to be painted, wherein a base coat paint with a viscosity of 2 to 30 dPa·s is applied to the surface to be painted, and after drying, a pattern paint with a viscosity of 10 to 60 dPa·s is applied, and before drying, a portion of the pattern paint is scraped off using a wood grain pattern forming jig, thereby easily forming a three-dimensional wood grain pattern with the scraped-off base layer exposed and the pattern paint remaining on the surface to be painted.

Description

[Technical Field]

[0001] This invention relates to a painting method. [Background technology]

[0002] Traditionally, wood grain patterns have been applied to the interior and exterior walls of buildings and to furniture to give them a natural look. Such wood grain patterns are applied using the following methods. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2006-15326 [Patent Document 2] Japanese Patent Application Publication No. 10-286521 [Overview of the project] [Problems that the invention aims to solve]

[0004] Patent Document 1 describes a patterning method that can easily form a soft, delicate, natural-looking straight grain pattern. Patent Document 2 describes a surface processing method in which a coating material is applied to a workpiece to form a coating material layer, and the coating material layer is scraped and slid with a scraping spatula while twisting to form a three-dimensional wood grain pattern. However, the wood grain pattern formed by the method described in Patent Document 1 could only be flat. Patent Document 2 describes a method that can form a three-dimensional wood grain pattern, but it is still insufficient and somewhat time-consuming. This invention provides a painting method that can easily form a three-dimensional, highly aesthetically pleasing wood grain pattern. [Means for solving the problem]

[0005] This painting method forms a wood grain-like textured pattern on a surface to be painted. A base coat paint with a viscosity of 2 to 30 dPa·s is applied to the surface to be painted, and after drying, a pattern paint with a viscosity of 10 to 60 dPa·s is applied. Before drying, a portion of the pattern paint is scraped off using a wood grain pattern forming jig. This allows for the easy formation of a three-dimensional wood grain pattern using the scraped-off base coat and the remaining pattern paint on the surface. By applying a paint of a different color from the base coat paint and pattern coat paint to the raised areas of the wood grain textured pattern formed by the aforementioned painting method, a wood grain textured pattern with excellent design can be easily formed.

[0006] By applying a paint with an opacity of 95% or less when it forms a film onto the wood grain textured pattern created by the aforementioned painting method, a natural and aesthetically pleasing wood grain textured pattern can be easily formed. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a perspective view showing an example of a wood grain pattern forming jig according to the embodiment. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described. The present invention relates to a painting method for forming a wood grain-like uneven pattern on a surface to be painted, comprising applying a base coat paint with a viscosity of 2 to 30 dPa·s to the surface to be painted, drying it, then applying a pattern paint with a viscosity of 10 to 60 dPa·s, and before it dries, scraping off a portion of the pattern paint using a wood grain pattern forming jig.

[0009] First, the surfaces to be painted using the painting method of the present invention include interior and exterior walls and ceilings of buildings, civil engineering structures, furniture and fixtures, etc., and the painting is applied to the substrates used in these. These substrates include mortar, concrete, ALC panels, extruded boards, siding boards, calcium silicate boards, gypsum boards, and fiber-reinforced cement boards, all of which are composed of inorganic materials such as cement.

[0010] In addition, steel materials, iron plates, metal sidings, etc., which are metal products, can also be mentioned. Additionally, tiles, glass, stone materials, wood, and plastic products, etc. can also be mentioned, and furthermore, there are those with a coating film formed thereon. And in order to improve the adhesion to these base materials or to prevent uneven suction, an undercoat paint such as a primer can also be applied.

[0011] In the coating method of the present invention, a base coating paint having a viscosity of 2 to 30 dPa·s is applied to the above-mentioned base material. The base coating paint of the present invention is used as a base coating when forming a wood grain-like uneven pattern, and the viscosity thereof is a value measured at 23°C using a viscometer (manufactured by Rion Co., Ltd.) and is 2 to 30 dPa·s.

[0012] If the viscosity of the base coating paint is within this range, the coating film formed by applying this paint becomes smooth, and a design can be imparted as a base coating for forming a wood grain pattern. When the viscosity of the base coating paint is lower than 2 dPa·s, sagging is likely to occur when applied to a vertical surface, and a smooth coating film may not be able to be formed. When the viscosity is higher than 30 dPa·s, unevenness is likely to occur and a smooth coating film may not be able to be formed.

[0013] This base coating paint preferably has a hiding power of 90% or more when it becomes a coating film. More preferably, the hiding power is 95% or more. By this, the color of the coated surface does not show through, and what is desired as the base design of the wood grain-like uneven pattern can be formed. Here, the hiding power referred to is a value measured by the method specified in Method B (hiding power test paper) of JIS K5600-4-1:1999 using a film applicator with a gap of 150 μm.

[0014] The application of this base coat paint can be carried out by coating methods commonly used for applying paints, such as spraying, painting rollers, and brushes. By such coating methods, the base coat paint is applied to the entire surface of the area where the wood grain-like uneven pattern is to be formed and dried to form a base coat film. After that, the pattern paint is applied on the base coat film.

[0015] The pattern paint of the present invention is used as the uneven pattern coating when forming a wood grain-like uneven pattern, and has a viscosity of 10 to 60 dPa·s measured at 23°C using a viscometer. Since the viscosity of the pattern paint is in the range of 10 to ⑥0 dPa·s, the pattern paint can be applied thickly, and unevenness can be imparted to the wood grain pattern formed when the pattern paint is scraped off with the wood grain pattern forming jig described later, so that a three-dimensional wood grain design can be formed.

[0016] When the viscosity is lower than 10 dPa·s, it is difficult to apply the paint thickly, so it is difficult to impart an uneven pattern. When the viscosity is higher than 60 dPa·s, the workability when applying the paint is not good, or the paint is applied too thickly and it is difficult to form a clean uneven pattern. The height of the convex part of this uneven pattern is preferably in the range of 100 to 1000 μm. Since the height of the convex part is in this range, unevenness can be recognized when touching the coating film, and a three-dimensional design can be formed. This pattern paint is preferably the same paint with a different dilution ratio from the above-mentioned base coat paint. By this, the adhesion between the coating film formed from the base coat paint and the coating film formed from the pattern paint becomes good.

[0017] Also, since it is the same paint, only one kind of paint needs to be prepared, so the storage space can be reduced, and the paint loss is also reduced, resulting in good work efficiency. This patterned paint can be applied using painting methods commonly used for paint application, such as spraying, using paint rollers, or brushes. Using such painting methods, the patterned paint is applied to the base coat, and before it dries, a portion of it is scraped off using a wood grain pattern forming jig.

[0018] The wood grain pattern forming jig of the present invention can use painting tools disclosed in the prior art. Figure 1 shows a perspective view of a typical wood grain pattern forming jig. The wood grain pattern forming jig 11 comprises a base portion 21 and a pattern forming portion 31, and may further comprise a gripping portion 41. The base portion 21 has a first direction D1 and a second direction D2 that extends perpendicular to the first direction D1, and in the first direction D1 it has a shape that extends in an arc shape that is convex outward, and preferably it has a shape that extends in a circular arc shape.

[0019] The pattern-forming section 31 is positioned to cover the base section 21. This pattern-forming section 31 is equipped with a protrusion 32. Each of these protrusions 32 has a tip that is pressed against the coated layer and is composed of multiple protrusions that extend in an arc shape. These multiple protrusions 32 are arranged to extend in a concentric circular shape, a concentric ellipse shape, or the like. They may also be arranged to extend in a wavy or linear shape. By pressing the protrusion 32 against the coating layer and scraping off the paint, a wood grain pattern can be formed.

[0020] The pattern-forming section 31 may be provided with comb-shaped sections 33 and 34, and it is preferable that the spacing of the combs in the comb-shaped section 33 and the comb-shaped section 34 are different. By pressing the comb-shaped section against the coated layer and scraping off the paint, a straight-grained wood grain pattern can be formed. Since the spacing of the comb-shaped sections 33 and 34 are different, straight-grained patterns with various spacings can be formed.

[0021] The base portion 21 can be made of any material as long as it does not burden the painter, but commonly used materials include resin materials, metal materials, and wood materials. The texture forming part 31 is preferably made of a rubber elastic material. Examples of the rubber elastic material include natural rubber, synthetic rubber, elastomer, etc. Examples of the synthetic rubber include butadiene rubber, isoprene rubber, chloroprene rubber, acrylate-butadiene rubber, isobutene-isoprene rubber, nitrile-butadiene rubber, nitrile-chloroprene rubber, pyridine-butadiene rubber, styrene-butadiene rubber, styrene-chloroprene rubber, styrene-isoprene rubber, urethane rubber, silicone rubber, etc.

[0022] In addition to the wood grain pattern forming jig 11 shown in FIG. 1, by using a spatula or a putty knife with serrations, etc., a straight grain pattern can be easily formed. By using such a wood grain pattern forming jig and scraping off a part of the pattern coating material, unevenness can be formed, and a wood grain-like uneven pattern is formed. It is preferable to paint the convex portions of the unevenness thus formed with a paint of a color different from that of the base coat paint.

[0023] In the present invention, different colors only need to be judged to be different in color by visual inspection, but it is preferable that the color difference is 1 or more in terms of ΔE. This ΔE is * a * b * the color difference in the color system, and ΔL * = L * (reference) - L * (object), Δa * = a * (reference) - a * (object), Δb * = b * (reference) - Δb * (object), when ΔE = (ΔL *2 + Δa *2 + Δb *2 ) 0.5 is represented by.

[0024] If ΔE is 1 or more, it can be judged that the color of the coating film formed from the base coat paint and the coating film formed by painting the convex portions is different by visual inspection, so that the wood grain pattern becomes distinct. Furthermore, it is preferable that the color of the paint applied to the raised areas be the same color as the base coat paint. Here, "same color" refers to colors belonging to the same hue on the color wheel, meaning a combination of colors that are similar in hue or consecutive. By using the same color paint for the raised areas and the base coat paint, a more natural wood grain pattern can be formed.

[0025] The paint applied to this raised area can be applied using methods commonly used for paint application, such as paint rollers and brushes, but it is preferable to use a trowel brush. A trowel brush is a painting tool with a paint-holding layer attached to a flat plate-like part, and the paint is applied to the surface to be painted by soaking the paint-holding layer with paint. Because a trowel brush allows for painting with a small amount of paint, it is easier to paint only on raised areas compared to a regular brush or roller. Furthermore, because it allows for easier control of pressure while painting, it's possible to achieve both a uniform finish and a gradient finish.

[0026] It is preferable to further apply a paint with an opacity of 95% or less when it forms a film onto the wood grain textured surface created as described above. More preferably, the opacity is 80% or less. By applying such a paint to the entire wood grain textured surface, the wood grain pattern blends in, resulting in a more natural finish. Furthermore, applying the paint allows for the wood grain pattern to be preserved while also being protected. If the opacity of the paint is greater than 95%, the wood grain pattern will be hidden by the paint. Any paint can be used as this paint, as long as the opacity rate when it forms a paint film is 95% or less. Preferably, it is a diluted paint used to paint the raised parts of a wood grain textured surface, or a paint mixed with a clear paint to form a color clear paint with an opacity rate of 95% or less.

[0027] By using paint that coats the raised areas of a wood-grain textured surface, a more natural wood-grain finish can be achieved. More preferably, the paint that coats the raised areas of a wood-grain textured surface is mixed with a clear paint to create a colored clear paint. Applying a colored clear paint allows the wood-grain texture to be preserved while also being protected. Furthermore, it is preferable that this paint has a viscosity in the range of 2 to 20 dPa·s. This viscosity range allows the paint to form a film without disrupting the wood grain texture when applied to a wood-grain pattern. This paint can be applied using commonly used painting methods such as spraying, using paint rollers, or brushes.

[0028] The paints used in this invention may be commonly used as long as they meet the above conditions, and are mainly composed of binder components such as organic binders like synthetic resins or inorganic binders like cement. There are also paints that are mixtures of organic and inorganic binders. Organic binders, such as synthetic resins, include acrylic resins, silicone resins, acrylic silicone resins, fluororesins, polyurethane resins, styrene resins, epoxy resins, melamine resins, alkyd resins, polyvinyl chloride resins, polyvinyl acetate resins, polyester resins, polyether resins, phenolic resins, and ketone resins.

[0029] These synthetic resins may be used individually or in mixtures of two or more types. The monomers that make them up are commonly used individually or copolymerized. These synthetic resins are often dispersed in water to form synthetic resin emulsions. Paints using these synthetic resin emulsions are water-based paints, and are preferred due to their ease of handling and workability.

[0030] Among synthetic resin emulsions using these synthetic resins, acrylic-based synthetic resin emulsions, acrylic styrene-based synthetic resin emulsions, acrylic silicone-based synthetic resin emulsions, and urethane-based synthetic resin emulsions, which have good water resistance, are preferably used. Furthermore, these synthetic resin emulsions are suitable for use not only for their water resistance but also for their paintability, the physical properties of the coating film, and their ease of availability.

[0031] Inorganic binders such as cement include Portland cement, blast furnace cement, alumina cement, jet cement, and white cement. Other inorganic binders include gypsum, slaked lime, dolomite plaster, silicates, and silica-based materials such as colloidal silica. In addition to these binders, paints are composed of various additives, including pigment components such as coloring pigments and extender pigments, filler components such as fillers and matting agents, fibers, surfactants such as wetting agents, dispersants, and defoamers, high-boiling point solvents such as film-forming aids, antifreezes, and plasticizers, viscosity modifiers such as thickeners, pH adjusters, preservatives, fungicides, algaecides, antibacterial agents, adsorbents, UV absorbers, antioxidants, and light stabilizers, as appropriate. [Examples]

[0032] The painting method of the present invention, configured in this manner, will be explained in more detail by a more detailed embodiment. For the surface to be painted, a slate board was prepared as the base material, with a water-based epoxy resin primer applied to the entire surface using a wool roller, and then painted using the paints shown in Table 1. This paint is an acrylic silicone-based synthetic resin emulsion paint. The viscosity was measured using a Visco Tester (manufactured by Rion Co., Ltd.). The opacity was measured using the method specified in JIS K5600-4-1:1999 Method B (Opacity Test Paper) with a film applicator with a gap of 150 μm. The color tone was determined by measuring the paint film of each paint using a spectrophotometer CM-600d (manufactured by Konica Minolta, Inc.). * value, a * value, b * The value was measured.

[0033] [Table 1]

[0034] (Example 1) For the base coat on the surface to be painted, paint A', which was prepared by adding 10% by weight of water to paint A, was applied to the entire surface using a wool roller and allowed to dry for about 5 hours. The viscosity of paint A' was 8 dP·s and the opacity was 95.2%. After drying, paint A was applied to the entire surface to be painted using a wool roller as a patterning paint. Before paint A dried, a portion of paint A was scraped off using the wood grain forming jig shown in Figure 1. After paint A dried, the height of the formed protrusions was measured at several points and found to be approximately 400 μm on average. Painting in this way resulted in a three-dimensional finish with a wood-grain-like texture on the paint film.

[0035] (Example 2) After forming a coating film in the same manner as in Example 1, paint B was applied only to the raised areas using a trowel brush. At this time, by soaking paint B in the paint-holding layer of the trowel brush before application, it was possible to easily apply paint B only to the raised areas. Painted using this method, the resulting finish has a wood-grain textured surface with different colored paint films on the raised and recessed areas, creating a visually appealing, textured look.

[0036] (Example 3) A colored clear coating was prepared by adding 5% by weight of paint B to clear coating D. The opacity of this colored clear coating was measured to be 37.7%. The above-mentioned clear color paint was applied to the entire surface of the coating film formed in the same manner as in Example 2 using a trowel brush. The finish achieved by this method resulted in a more natural wood grain texture with a smoother transition between the raised and recessed areas.

[0037] (Comparative Example 1) For the base coat of paint, paint A', which was prepared by adding 10% by weight of water to paint A, was applied to the entire surface of the surface to be painted using a wool roller. After applying paint A', it was left to dry for about 5 hours. Then, as a pattern-forming paint, paint A' was applied to the entire surface to be painted using a wool roller, and before paint A' dried, a portion of paint A' was scraped off using the wood grain forming jig shown in Figure 1. The finish achieved by this method was flat, with no unevenness in the paint film even after scraping with the wood grain forming jig, possibly due to the low viscosity of paint A' used as a pattern-forming paint.

[0038] (Comparative Example 2) Paint C was applied to the entire surface of the surface to be painted using a wool roller as a base coat. After applying Paint C, it was left to dry for about 5 hours. Then, Paint C was applied to the entire surface of the surface to be painted using a wool roller as a patterning paint, and before Paint C dried, a portion of Paint C was scraped off using the wood grain forming jig shown in Figure 1. The finish achieved using this method resulted in an unnatural wood-grain textured surface, possibly due to the high viscosity of paint C. The paint film formed from the base coat was not flat, and the unevenness created by the textured paint was too pronounced, resulting in an unnatural wood-grain pattern. [Explanation of Symbols]

[0039] 11… Wood grain pattern forming jig 21...Base 31...Pattern-forming section 32... protruding part 33... Comb pattern 34... Comb pattern 41...Gripping part D1…first direction D2…Second direction

Claims

1. A painting method for forming a wood grain-like uneven pattern on a surface to be painted, wherein a base coat paint with a viscosity of 2 to 30 dPa·s is applied to the surface to be painted, and after drying, a pattern coat paint with a viscosity of 10 to 60 dPa·s is applied, and before drying, a portion of the pattern coat paint is scraped off using a wood grain pattern forming jig to form a wood grain-like uneven pattern.

2. A painting method for forming a wood grain textured pattern with excellent design appeal by painting a paint of a different color from the base coat paint and the pattern coat paint on the raised parts of the wood grain textured pattern formed by the painting method described in claim 1.

3. A painting method comprising applying a paint having an opacity of 95% or less when it forms a paint film onto a wood grain pattern formed by the painting method described in claim 1 or claim 2.

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