Painting method

Abstract

This invention provides a painting method that allows for the easy formation of a three-dimensional, highly aesthetic wood grain pattern with fewer steps. [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 of a different color with a viscosity of 10 to 60 dPa·s is applied, and before drying, the pattern paint is scraped off using a wood grain pattern forming jig, thereby simultaneously forming a wood grain textured pattern and a wood grain color tone, and allowing a wood grain textured pattern to be easily applied in fewer steps.

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 aesthetic wood grain pattern with fewer steps. [Means for solving the problem]

[0005] A painting method for forming a wood grain textured 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 of a different color 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. The scraped-off base layer and the remaining paint on the painted surface simultaneously create a wood-grain textured pattern and wood-grain color tone, allowing for easy application of a wood-grain textured pattern with fewer steps.

[0006] In the aforementioned painting method, the opacity of the coating film formed from the base coat paint is 90% or more, and the opacity of the coating film formed from the pattern coat paint is 10% or more. As a result, in the thinner parts of the coating film where the pattern coat paint remains, the color of the base coat paint is visible, while in the thicker parts of the coating film, the color of the pattern coat paint is visible, making it possible to easily form a deep, natural, and aesthetically pleasing wood grain textured pattern with fewer steps. By applying a paint with an opacity of 95% or less when it forms a film onto the wood grain textured surface created by the aforementioned painting method, a more natural and aesthetically pleasing wood grain textured surface can be easily formed with fewer steps. [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 of a different color 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 surface to be painted in the painting method of the present invention includes the inner and outer walls, ceilings of buildings, civil engineering structures, furniture, fixtures, etc., and paints the substrates used for these. Examples of these substrates include mortar, concrete, ALC panels, extruded boards, siding boards, calcium silicate boards, gypsum boards, fiber-reinforced cement boards, etc. that contain inorganic substances such as cement as components.

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

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

[0012] If the viscosity of the base coat paint is within this range, the coating film formed by applying this paint will be smooth, and a design can be imparted as a base coating for forming a wood grain pattern. When the viscosity of the base coat paint is lower than 2 dPa·s, dripping is likely to occur when painted on 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] The coating film formed from this base coat paint preferably has a hiding power of 90% or more. More preferably, the hiding power is 95% or more. By this, the color of the surface to be painted does not show through, and the desired design as the base of the wood grain-like uneven pattern can be formed. The hiding power referred to here 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] This base coat paint can be applied by common painting methods such as spraying, painting rollers, and brushes used for applying paint. By such a painting method, the base coat paint is applied to the entire surface of the portion where the wood grain-like uneven pattern is to be formed and dried to form a base coat film. Thereafter, the pattern paint is applied on the base coat film.

[0015] The pattern paint of the present invention is used as the uneven pattern painting when forming a wood grain-like uneven pattern and has a different color from the base coat paint. In the present invention, different colors mean that it is sufficient if it can be judged that the colors are different visually, but it is preferable that the color difference is 1 or more in terms of ΔE.

[0016] This ΔE is * a * b * the color difference in the color system, and ΔL * = L * (reference) - L * (target), Δa * = a * (reference) - a * (target), Δb * = b * (reference) - Δb * (target), when ΔE = (ΔL *2 + Δa *2 + Δb *2 ) 0.5 is represented by. If ΔE is 1 or more, it can be judged that it is different visually from the coating film formed from the base coat paint, and thus the wood grain pattern becomes clear.

[0017] Furthermore, it is preferable that the color of the patterning paint 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 for both the patterning paint and the base coat paint, a more natural wood grain pattern can be formed. This patterning paint has a viscosity of 10-60 dPa·s, as measured at 23°C using a viscometer. This viscosity range allows for a thick application of the patterning paint, and when a portion of the paint is scraped off using the wood grain pattern forming jig described later, it creates a textured wood grain pattern, thus enabling the creation of a three-dimensional wood grain design.

[0018] If the viscosity is lower than 10 dPa·s, it is difficult to apply the paint thickly, making it difficult to create a textured pattern. If the viscosity is higher than 60 dPa·s, the paint may not be easy to apply, or it may be applied too thickly, making it difficult to form a clean textured pattern. The height of the raised portion of this uneven pattern is preferably in the range of 100 to 1000 μm. Because the height of the protrusions is within this range, the unevenness can be perceived when the coating is touched, and a three-dimensional design can be formed. The coating film formed from this patterning paint preferably has an opacity of 10% or more. If the opacity is lower than 10%, the coating film formed from the patterning paint will not have sufficient opacity, causing the coating film formed from the base coat paint to show through, resulting in an unclear wood grain pattern.

[0019] It is preferable that the opacity rate is in the range of 20-60%. Within this range, the color of the base coat paint will show through in the thinner areas where the patterned paint remains, while the color of the patterned paint will show through in the thicker areas, creating a deeper, more natural wood grain pattern. 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.

[0020] 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.

[0021] 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. 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.

[0022] 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 pattern-forming portion 31 is preferably made of a rubber elastic material. Examples of rubber elastic materials include natural rubber, synthetic rubber, and elastomers. Examples of synthetic rubbers 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, and silicon rubber.

[0023] In addition to the wood grain pattern forming jig 11 shown in Figure 1, straight-grain wood grain patterns can also be easily formed by using tools such as spatulas or trowels with comb-like grooves. By using such a wood grain pattern forming jig to scrape off the pattern-applying paint, a textured surface can be formed, creating a wood grain-like textured pattern.

[0024] 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 version of the paint used to form the wood grain texture, or a color clear paint mixed with a clear paint to achieve an opacity rate of 95% or less when it forms a paint film.

[0025] By using the same paint used to create the wood grain texture, a more natural wood grain finish can be achieved, and adhesion will also be improved. More preferably, the paint used to form the wood grain texture is mixed with a clear paint to create a colored clear paint. By applying the colored clear paint, the wood grain pattern can be preserved while also being protected.

[0026] 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, painting rollers, and brushes, but it is preferable to apply it using a trowel brush.

[0027] A trowel brush is a type of painting tool that has a paint-holding layer attached to a flat, plate-like part. The paint is soaked into the paint-holding layer and then applied to the surface to be painted. Because the trowel brush allows for easy control of pressure during painting, it's possible to create both a uniform finish and a gradient finish, making it easy to form aesthetically pleasing wood-grain textured patterns.

[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, a color clear paint D was prepared by adding 5% by weight of paint B to the clear paint C and stirring, as a paint for creating patterns. The viscosity of this color clear paint D was 26 dP·s and the opacity was 32.1%. This color clear paint D was applied to the entire surface to be painted using a wool roller, and before it dried, a portion of the color clear paint D was scraped off using the wood grain forming jig shown in Figure 1. After the color clear paint D dried, the height of the formed protrusions was measured at several points and found to be approximately 400 μm on average. The finish achieved by this painting method features a highly aesthetic wood-grain textured surface, and the wood-grain textured pattern can be easily formed with fewer steps.

[0035] (Example 2) After forming a coating film in the same manner as in Example 1, color clear paint D', which was diluted by adding 10% by weight of water to color clear paint D, was applied to the entire surface to be painted using a trowel brush. The viscosity of this color clear paint D' was 3.4 dP·s, and the opacity was 26.2%. Painting using this method resulted in a more natural wood-grain textured finish. Furthermore, it was possible to easily create a wood-grain textured pattern with minimal material.

[0036] (Comparative Example 1) For the base coat, paint A', diluted by adding 10% by weight of water to paint A, was applied to the entire surface of the surface using a wool roller and allowed to dry for about 5 hours. Then, for the texture coat, paint B', diluted by adding 10% by weight of water to paint B, was applied to the entire surface of the surface using a wool roller. The viscosity of paint B' was 8 dP·s and the opacity was 95.8%. Before paint B' dried, a portion of it was scraped off using the wood grain forming jig shown in Figure 1. The finished product painted using 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 B' used as the patterning paint.

[0037] (Comparative Example 2) For the base coat, 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, and left to dry for about 5 hours. Then, for the patterning coat, paint A was applied to the entire surface of the 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. In this painting method, the difference in color between the base coat paint and the pattern paint was not visible to the naked eye, resulting in an indistinct wood grain pattern. [Explanation of symbols]

[0038] 11… Wood grain pattern forming jig 21...Base 31...Pattern-forming section 32... protruding part 33... Comb-patterned section 34... Comb-shaped section 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 paint of a different color 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 forming a wood grain-like uneven pattern and a wood grain-like color tone simultaneously.

2. The painting method according to claim 1, wherein the opacity of the coating film formed from the base coat coating paint is 90% or more, and the opacity of the coating film formed from the pattern coating paint is 10% or more.

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-like uneven pattern formed by the painting method described in claim 1 or claim 2.

Images