JP4400822B2 - Method of painting concrete exposed surface - Google Patents

Description

  The present invention relates to a method for painting a concrete exposed surface.

The concrete exposed surface (hereinafter also simply referred to as “release surface”) has a unique texture that can give a natural and simple impression, and is therefore widely used in buildings, civil engineering structures, and the like.
In general, such a release surface is obtained by placing concrete in a mold and demolding after solidification. However, burrows, misunderstandings, unevenness, cracks, etc. are likely to occur on the surface of the release surface after demolding. In addition, cracks and the like may occur due to aging. If such a problem occurs, repair is required.

  As a repair material for the exposed surface, a material is used that is prepared by adding a pigment to a cement-based material such as polymer cement mortar so as to have the same color as the concrete surface around the defect. However, simply filling such a cement-based material may make the repaired part noticeable and adversely affect the finish.

Japanese Patent Laid-Open No. 7-305517 (Patent Document 1), Japanese Patent Laid-Open No. 10-2083 (Patent Document 2), and the like have proposed methods for improving the finish in the repaired portion of the exposed surface.
Among these, Patent Document 1 describes a method in which a defective portion of a hitting surface is repaired with a polymer cement mortar toned with a color pigment, and then coloring showing gradation is centered on the repaired portion by tapping. .
Patent Document 2 describes a method in which a drape of a dough surface is filled with dough finishing mortar, and then a mottled pattern forming tool is impregnated with a finish coating material that matches the concrete color.

Japanese Patent Laid-Open No. 7-305517 Japanese Patent Laid-Open No. 10-2083

However, all the methods described in the above-mentioned patent documents use a cement-based repair material. The part that has been repaired with such cement-based repair material has a greater degree of paint suction than the surrounding exposed surface, and the surface of the repaired part changes to blackish (ie, wet color) when struck. . In addition, in a cement-based repair material toned with a color pigment or the like, the repaired portion has a single color such as paint, and a texture similar to the surrounding concrete cannot be expressed.
For these reasons, in order to finish the repaired portion of the exposed surface without a sense of incongruity, it is necessary to carefully apply tapping, and at present, a great deal of effort is spent on tapping.

  The present invention has been made in view of the above points, and in painting concrete exposed surfaces, the repaired portion is made inconspicuous, the texture of the concrete is not impaired in the repaired portion, and the finish is highly aesthetic. It is an object to provide a method that can be easily obtained.

  In order to achieve the above object, as a result of intensive studies, the present inventor repaired a defect portion of a concrete exposed surface using a specific non-cement-based repair material, and then used a colored transparent paint toned to a concrete color, The inventors came up with a method of hitting and painting the repaired part and its peripheral part, and completed the present invention.

That is, the present invention relates to a painting method having the following characteristics.
1. 200 to 2000 parts by weight of at least two or more kinds of colored powders having an average particle diameter of 10 to 500 μm and different brightnesses are mixed with 100 parts by weight of the solid content of the organic binder, and the colored powders are mixed After repairing the missing part of the concrete exposed surface using the repair material adjusted to the concrete color by adjusting the ratio,
A method of painting a concrete exposed surface, characterized in that a repaired part and its peripheral part are struck using a colored transparent paint toned in concrete color.
2. 200 to 2000 parts by weight of at least two or more kinds of colored powders having an average particle diameter of 10 to 500 μm and different brightnesses are mixed with 100 parts by weight of the solid content of the organic binder, and the colored powders are mixed Repair the missing part of the concrete exposed surface using the repair material adjusted to the concrete color by adjusting the ratio,
Then, after painting the undercoat on the entire surface including the repaired part,
A method of painting a concrete exposed surface, characterized in that a repaired part and its peripheral part are struck using a colored transparent paint toned in concrete color.
3. After tapping, a colorless transparent paint or colored transparent paint is further applied as a top coat. Or 2. The method for painting concrete exposed surfaces as described in 1.

  By applying the painting method of the present invention to the concrete exposed surface, the repaired portion is made inconspicuous, and the texture of the concrete is not impaired in the repaired portion, and a finish with high aesthetics can be easily obtained.

  The present invention can be applied to a concrete exposed surface. The present invention is a coating method that is particularly suitable for exposed surfaces that have deteriorated over time, but can also be applied to newly installed surfaces.

  In the present invention, repair is performed on the defect portion of the concrete exposed surface to be painted.If the degree of defect in the defect portion is significant, before the repair, epoxy resin, polymer cement mortar, caulking material, etc. It is also possible to fill the defect part. The surface treatment can also be performed with an alkali imparting agent such as an alkali silicate.

  In the present invention, a non-cement-based material containing an organic binder and colored powder as essential components is used as the repair material. By using such a non-cement type repair material, it is possible to suppress the occurrence of wet color when a paint is applied to the repaired part in a later step.

  The organic binder in the repair material is a component that acts as a binder. As the organic binder, one or more selected from water-soluble resins and water-dispersible resins are suitable. The type of the resin is not particularly limited, and examples thereof include cellulose, polyvinyl alcohol, vinyl acetate resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicon resin, fluorine resin, or a composite system thereof. 1 type, or 2 or more types of these can be used. These may have cross-linking reactivity. In the case where a material having cross-linking reactivity is used, the water resistance, adhesion and the like of the coating film can be improved.

  As a binder in the repair material, an inorganic binder can be used in combination as necessary. Examples of such inorganic binders include colloidal metal oxides such as colloidal silica and colloidal alumina, water-soluble alkali metal silicates such as sodium silicate, potassium silicate, and lithium silicate, and silicone resins. .

  As the colored particles, at least two or more kinds of colored particles having an average particle diameter of 10 to 500 μm and different brightness are used. In the present invention, by adjusting the mixing ratio of such a plurality of types of colored powder particles and adjusting the repair material to a concrete color, it is possible to obtain a texture that approximates the exposed surface around the repair portion.

The lightness of the colored granular material means L ^* in the CIE 1976 L ^* a ^* b ^* color space. This L ^* can be measured by a color difference meter.
In the present invention, L ^* is 75 or more (preferably 75 or more and 95 or less, more preferably 80 or more and 95 or less), and L ^* is less than 75 (preferably 40 or more and less than 75, more preferably 50 or more). It is desirable to use at least two kinds of colored powders of 70 or less) as essential components. In particular, these colored powder particles are achromatic colored powder particles, that is, the absolute value of a ^* is 5 or less (preferably 3 or less, more preferably 2 or less), and the absolute value of b ^* is 10 or less. The following is preferable (preferably 8 or less, more preferably 6 or less).

  As the colored powder particles, those made of various materials can be used, but those obtained by subjecting the base particles to surface treatment with pigments, dyes, glazes and the like are preferable. Examples of the base particles of the colored granular material include silica sand, crushed stone, glass beads, and resin beads. In the present invention, colored silica sand using silica sand as a base particle is particularly suitable.

  The average particle diameter of each colored powder is 10 to 500 μm, preferably 20 to 300 μm, more preferably 30 to 200 μm. When the average particle diameter is too small, the repaired portion has a single color, and it is impossible to express the design of the tone. When the average particle size is too large, the individual particles of the colored powder particles become conspicuous, and it is not possible to express the design of the release tone. Also, the smoothness of the repaired part is impaired.

  The mixing ratio of the colored particles is 200 to 2000 parts by weight, preferably 300 to 1500 parts by weight, and more preferably 400 to 1000 parts by weight with respect to 100 parts by weight of the solid content of the organic binder. When the mixing ratio of the colored particles is too small, the concealment rate of the repaired portion is insufficient, and the concrete texture cannot be obtained. If the mixing ratio of the colored powder particles is too large, the degree of suction when the paint is applied in the subsequent process will increase. In addition, there is a risk of hindering the painting workability at the time of repair.

  In the repair material, various additives can be mixed as necessary in addition to the above-described components. Examples of such additives include fibers, fillers, preservatives, antifungal agents, antifoaming agents, leveling agents, dispersants, anti-settling agents, anti-sagging agents, film-forming aids, anti-freezing agents, and drying agents. Examples of the adjusting agent include a diluent, a pH adjusting agent, an antioxidant, an ultraviolet absorber, and a crosslinking agent.

The hue of the repair material may be appropriately adjusted to the surrounding concrete color. Normally, the color difference ΔE between the cured repair material and the surrounding exposed surface may be 5 or less (preferably 3 or less, more preferably 2 or less). In the toning of the repair material, it is desirable to use only the above-mentioned colored powder particles, but it is also possible to use a color pigment or the like in combination.
When toning is performed at the painting site, a plurality of repair materials having different hues are prepared in advance, and these can be mixed appropriately according to the concrete color at the site.

The application amount of the repair material is usually about 0.5 to ² kg / m ² , although it depends on the defect degree of the defect part. A trowel, spatula, or the like can be used as a paint tool.
The drying time is usually about 4 to 24 hours at room temperature.
After the repair material is dried, polishing treatment or the like can be performed as necessary.

In the present invention, it is desirable to apply the undercoat paint on the entire surface including the repaired portion after the repair. This process can improve the finish.
As the undercoat paint, a paint containing at least an organic resin and having a formed coating film having transparency can be used.
The type of organic resin in the undercoat paint is not particularly limited, and examples thereof include vinyl acetate resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicon resin, fluorine resin, or a composite system thereof. These 1 type (s) or 2 or more types can be used. As such an organic resin, a water-soluble resin and / or a water-dispersible resin is preferable.

In the undercoat paint, a white transparent paint containing 0.1 to 10 parts by weight (preferably 0.2 to 3 parts by weight) of a white pigment with respect to 100 parts by weight of the solid content of the organic resin is suitable. By using such an undercoat paint, the finish can be further enhanced.
The average particle diameter of the white pigment is usually 0.1 to 1 μm. Specific examples of the white pigment include titanium oxide, zinc oxide, aluminum oxide, magnesium oxide, and hollow resin particles. Of these, titanium oxide is particularly preferable.

If the undercoat paint contains an alkoxysilane compound in addition to the organic resin and white pigment, it will block the entry of water, carbon dioxide, etc. from the outside, and prevent a decrease in strength due to neutralization of the substrate. Can enhance the effect. Furthermore, it is possible to obtain the effect of suppressing the corrosion of the steel frame or the reinforcing bar existing inside the housing, and the effect of preventing the occurrence of efflorescence on the substrate surface layer due to the migration of the calcium component inside the substrate.
The mixing ratio of the alkoxysilane compound is usually 5 to 400 parts by weight, preferably 10 to 200 parts by weight with respect to 100 parts by weight of the resin solid content.

As the alkoxysilane compound, a hydrolyzable alkoxysilane compound is suitable.
Examples of the hydrolyzable alkoxysilane compound include methyltriethoxysilane, ethyltriethoxysilane, dimethyldiethoxysilane, diethyldiethoxysilane, hexyltriethoxysilane, octyltriethoxysilane, phenyltrimethoxysilane, β- ( 3,4 epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ -Aminopropyltrimethoxysilane, isocyanate functional silane and the like. These can be used individually or in mixture of several types.

  For undercoat paints, preservatives, antifungal agents, antifoaming agents, leveling agents, dispersants, anti-settling agents, anti-sagging agents, film-forming aids, anti-freezing agents, and drying controls that are usually used in paints as needed Additives such as an agent, a diluent, a pH adjuster, an antioxidant, an ultraviolet absorber, a crosslinking agent, and a matting agent may be used alone or in combination.

The application amount of the undercoat paint is usually about 0.1 to 0.3 kg / m ² . As the paint tool, a known tool such as a spray gun, a roller, or a brush can be appropriately selected and used. The drying time is usually about 2 to 4 hours at room temperature.

  Next, in the present invention, a colored transparent paint is applied to the repaired portion and its peripheral portion.

As the colored transparent paint, those containing an organic resin and a color pigment and having a formed coating film with transparency are suitable.
The type of organic resin in the colored transparent paint is not particularly limited, and examples thereof include vinyl acetate resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicon resin, fluorine resin, or a composite system thereof. 1 type, or 2 or more types of these can be used. As such an organic resin, a water-soluble resin and / or a water-dispersible resin is preferable.

  As the coloring pigment, a general coloring pigment for paint can be used. Specifically, for example, titanium oxide, zinc oxide, carbon black, lamp black, bone black, graphite, black iron oxide, copper chrome black, cobalt black, copper manganese iron black, brown, molybdate orange, permanent red, permanent Carmine, anthraquinone red, perylene 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. are mentioned, These 1 type (s) or 2 or more types can be used.

In the colored transparent paint, it is desirable to blend 0.5 to 20 parts by weight (preferably 1 to 10 parts by weight) of the color pigment with respect to 100 parts by weight of the solid content of the organic resin. If the mixing ratio of the color pigment is within such a range, colorability and transparency can be ensured.
About the hue of a colored transparent coating material, it can set suitably in the range in which a concrete color is finally expressed by hitting.

  For colored transparent paints, antiseptics, antifungal agents, antifoaming agents, leveling agents, dispersants, anti-settling agents, anti-sagging agents, film-forming aids, anti-freezing agents, and drying agents that are usually used in paints as necessary Additives such as a regulator, a diluent, a pH adjuster, an antioxidant, an ultraviolet absorber, a crosslinking agent, and a matting agent may be used alone or in combination.

  In the present invention, such a colored transparent paint is used to strike and repair the repaired portion and its peripheral portion. For example, dandelions, sponges, felts, and the like can be used as a paint tool for struck coating (hereinafter referred to as “tapping tool”). The surface shape of the hitting tool is not particularly limited, and may be any of a square, a triangle, a circle, and the like.

When tapping is applied, it is desirable to apply a colored transparent paint so that the shade of the hue gradually changes over the repaired portion and its peripheral portion.
The shade of the hue can be adjusted by using a plurality of colored transparent paints (usually 2 to 4 colors) having different hues. What is necessary is just to set suitably the hue of the colored transparent coating material used for hit | coating in consideration of the hue of the concrete exposed surface used as coating object, a desired finishing feeling, etc.
Further, the shade of the hue at the time of hitting can be adjusted by appropriately changing the amount of the colored transparent paint applied, the pressure at the time of applying, the number of times of hitting. Furthermore, it is possible to obtain a more natural finish feeling by applying the hitting tool while randomly changing the direction of the hitting tool.

In this invention, what has a several unevenness | corrugation in a coating part (FIG. 1) is suitable as a hitting coating tool. If such a hitting tool is used, natural shading can be easily imparted, and work efficiency at the time of hitting can be increased.
In the tapping painter of FIG. 1, the coating part 2 is attached to the base part 3. The base material portion 3 may be any material as long as the application portion can be fixed, and the material thereof may be any of wood material, plastic, metal, and the like. Moreover, a handle etc. can also be provided in the base material part 3 as needed. The applicator 2 of the hitting tool may be made of a material having moderate flexibility, and for example, a material made of a sponge material or a fiber material can be used.

FIG. 2 shows a cross-sectional shape of the hitting tool of FIG.
Although the height of the convex part in the application part 2, a space | interval, etc. can be set suitably, natural texture can be improved by providing a convex part random to some extent. The interval between the convex portions is usually about 5 to 50 mm, preferably about 10 to 30 mm, and the height of the convex portions is usually about 2 to 30 mm, preferably about 3 to 20 mm. Within such a range, it is desirable to provide random protrusions. Moreover, the edge of the application part 2 should be gently processed.

  In the present invention, after the colored transparent paint is struck, a top coat can be further applied to the entire surface. In this case, a colorless transparent paint or a colored transparent paint may be used as the top coat. This step can improve the weather resistance, water resistance, and the like of the exposed surface. As the top coating material, for example, a coating material containing an organic resin such as an acrylic resin, a urethane resin, an acrylic silicon resin, or a fluororesin is suitable. Such an organic resin is desirably a water-soluble resin and / or a water-dispersible resin.

  The top coat in the present invention may be either a matte type or a glossy type, but the matte type is preferred in terms of improving the texture of the finished surface. In particular, when the organic resin in the top coat is a water-soluble resin and / or a water-dispersible resin, (M) resin beads having a specific gravity of 1.0 to 1.5 (hereinafter referred to as “(M) component”), And (N) a top coating material containing a wax having a specific gravity of 0.7 or more and less than 1.0 (hereinafter referred to as “component (N)”) as a matting agent. By using such a top coating, a sufficient matting effect and gloss unevenness prevention effect can be exhibited, and a finished surface with excellent texture can be obtained.

The specific gravity of the component (M) is 1.0 or more and 1.5 or less, preferably 1.05 or more and 1.40 or less, more preferably 1.10 or more and 1.30 or less.
As the component (M), known or commercially available resin beads can be used as long as the specific gravity is within the above range. Specifically, for example, urethane beads, acrylic beads, polyethylene beads, polypropylene beads, polymethyl methacrylate beads, polystyrene beads, nylon beads, styrene acrylic beads, silicon beads, fluorine beads, cellulose beads, vinyl chloride beads, EVA beads. 1 type, or 2 or more types, such as these, can be used. Among these, urethane beads, acrylic beads, polyethylene beads, polypropylene beads, polymethyl methacrylate beads and the like are preferable.

  The average particle size of the component (M) is preferably 1 μm to 20 μm (more preferably 5 μm to 10 μm). When the average particle size of the component (M) is in such a range, an excellent matting effect can be obtained.

Component (N) is a wax having a specific gravity of 0.7 or more and less than 1.0 (preferably 0.75 or more and 0.98 or less, more preferably 0.80 or more and 0.95 or less).
Specific examples of the component (N) include, for example, polyethylene wax and derivatives thereof, montan wax and derivatives thereof, paraffin wax and derivatives thereof, microcrystalline wax and derivatives thereof, petrolatum, carnauba wax, candelilla wax, rice wax, wood Examples include wax, lanolin, beeswax, and Fischer-Tropsch wax. These can be used alone or in combination of two or more. Of these, polyethylene wax and paraffin wax are preferred in the present invention.

The form of the component (N) is not particularly limited, such as a solid or a liquid, but in the present invention, it is preferably a liquid, and particularly preferably a wax emulsion. In the case of a wax emulsion, advantageous physical properties in terms of dispersibility and stain resistance can be obtained.
When component (N) is a wax emulsion, the average particle diameter of the emulsion particles is preferably 0.5 μm to 20 μm (more preferably 1 μm to 10 μm).

The refractive index of the component (M) and the component (N) is 1.35 or more and 1.75 or less (more preferably 1.40 or more and 1.65 or less, more preferably 1.45 or more and 1.55 or less). Preferably there is. In addition, when (N) component is a wax emulsion, it means the refractive index of emulsion particles.
In particular, when the difference in refractive index of each component (organic resin, (M) component, and (N) component) is 0.10 or less, the transparency of the coating is increased and the texture of the exposed surface is improved. You can make full use of it.

The mixing ratio of the component (M) is usually 1 to 100 parts by weight (more preferably 5 to 60 parts by weight, still more preferably 10 to 40 parts by weight) with respect to 100 parts by weight of the solid content of the organic resin. The mixing ratio of the component (N) is usually 1 to 100 parts by weight (more preferably 5 to 60 parts by weight, still more preferably 10 to 40 parts by weight) with respect to 100 parts by weight of the solid content of the organic resin.
The weight ratio of the (M) component and the (N) component is 100: 10 to 100: 1000 (more preferably 100: 15 to 100: 800, and still more preferably 100: 30 to 100: 500). Is preferred. In addition, when (N) component is a wax emulsion, a mixing ratio is based on solid content weight.
By adjusting the mixing ratio of each component within such a range, a sufficient matting effect and gloss unevenness prevention effect can be obtained. Furthermore, the transparency and water resistance of the formed coating film can be improved.

  In addition to the components described above, known additives can be mixed in the top coating composition of the present invention to such an extent that the effects of the present invention are not impaired. Examples of such additives include preservatives, antifungal agents, leveling agents, dispersants, pigments, film-forming aids, anti-settling agents, anti-sagging agents, anti-freezing agents, drying adjusters, pH adjusters, and crosslinking agents. Agents, diluents, antifoaming agents, antioxidants, ultraviolet absorbers, light stabilizers, low-contaminating agents and the like.

The top coating may be applied by a known method, for example, by various coating methods such as spray coating, roller coating, brush coating, and the like. The amount of top coating applied is usually about 0.1 to 0.3 kg / m ² .

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

In the production of repair materials, undercoat paints, and colored transparent paints, the following raw materials were used. The values of L ^* , a ^* , and b ^* were measured using a color difference meter “CR-300” (manufactured by Minolta Co., Ltd.).

Synthetic resin emulsion A: acrylic resin emulsion (solid content 50% by weight, glass transition temperature 30 ° C., film refractive index 1.47)
Synthetic resin emulsion B: Acrylic silicon resin emulsion (solid content 50 wt%, glass transition temperature 30 ° C., film refractive index 1.47)
Synthetic resin emulsion C: Acrylic silicon resin emulsion (solid content 50% by weight, glass transition temperature 35 ° C., film refractive index 1.47)
White silica sand (average particle size 150 μm, L ^* = 85, a ^* = 0.9, b ^* = 4.7)
Gray silica sand (average particle size 150 μm, L ^* = 65, a ^* = 0.1, b ^* = 3.8)
White pigment dispersion: 60% by weight dispersion of titanium oxide (average particle size 0.3 μm) Black pigment dispersion: 20% by weight dispersion of carbon black (average particle size 0.05 μm) Filler: heavy Calcium carbonate (average particle size 20μm)
・ Fiber: Pulp fiber (average fiber length 0.5mm)
Matting agent A: Resin beads (polymethyl methacrylate beads, average particle size 8 μm, refractive index 1.49, specific gravity 1.19)
Matting agent B: Wax (polyethylene wax emulsion, average particle size 5 μm, solid content 40% by weight, refractive index 1.52, specific gravity 0.93)
Dispersant: Styrene-maleic acid copolymer (solid content 30% by weight)
・ Film-forming auxiliary: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate ・ Thickener: hydroxyethyl cellulose 3 wt% aqueous solution ・ Alkoxysilane compound: emulsified dispersion of hexyltriethoxysilane (solid 40% by weight)
・ Defoamer: Silicone-based defoamer

(Manufacture of repair materials)
Repair material 1
For 200 parts by weight of synthetic resin emulsion A, 600 parts by weight of white silica sand, 350 parts by weight of gray silica sand, 200 parts by weight of filler, 10 parts by weight of fiber, 100 parts by weight of water, 150 parts by weight of thickener, 15 parts by weight of dispersant, Repair material 1 was produced by mixing and stirring 15 parts by weight of a film-forming aid and 2 parts by weight of an antifoaming agent by a conventional method.
In addition, color difference (DELTA) E of the cured coating film of the repair material 1 and the concrete exposed surface used for the below-mentioned test was 0.8.

Repair material 2
1000 parts by weight of filler, 10 parts by weight of fiber, 100 parts by weight of water, 150 parts by weight of thickener, 15 parts by weight of dispersant, 15 parts by weight of film-forming aid, and antifoaming agent 2 for 200 parts by weight of synthetic resin emulsion A The repair material 2 was manufactured by mixing and stirring a weight part by a conventional method.
Next, the repair material 2 was toned with a white pigment dispersion and a black pigment dispersion. The color difference ΔE between the cured coating film of the repair material 2 after toning and the concrete exposed surface used in the test described later was 0.9.

Repair material 3
30 parts by weight of synthetic resin emulsion A, 80 parts by weight of filler, 2 parts by weight of fiber, 1 part by weight of a dispersant, 2 parts by weight of a film-forming aid, and 35 parts by weight of water are mixed and stirred by a conventional method with respect to 100 parts by weight of cement. The repair material 3 was manufactured by doing.
Next, the repair material 3 was toned with a white pigment dispersion and a black pigment dispersion. The color difference ΔE between the cured coating film of the repair material 3 after toning and the concrete exposed surface used in the test described later was 0.8.

(Manufacture of undercoat paint)
Undercoating paint by mixing and stirring in a conventional manner 1 part by weight of a white pigment dispersion, 15 parts by weight of a film-forming aid, 150 parts by weight of an alkoxysilane compound, and 2 parts by weight of an antifoaming agent with respect to 200 parts by weight of the synthetic resin emulsion B 1 was produced.

(Manufacture of colored transparent paint)
Colored transparent paint 1
To 200 parts by weight of the synthetic resin emulsion B, 10 parts by weight of a white pigment dispersion, 0.2 parts by weight of a black pigment dispersion, 15 parts by weight of a film-forming aid, and 2 parts by weight of an antifoaming agent are mixed and stirred by a conventional method. The colored transparent paint 1 was produced by
Colored transparent paint 2
To 200 parts by weight of the synthetic resin emulsion B, 9 parts by weight of a white pigment dispersion, 0.4 parts by weight of a black pigment dispersion, 15 parts by weight of a film-forming aid, and 2 parts by weight of an antifoaming agent are mixed and stirred by a conventional method. The colored transparent paint 2 was produced by
Colored transparent paint 3
To 200 parts by weight of the synthetic resin emulsion B, 8 parts by weight of a white pigment dispersion, 0.6 parts by weight of a black pigment dispersion, 15 parts by weight of a film-forming aid, and 2 parts by weight of an antifoaming agent are mixed and stirred by a conventional method. The colored transparent paint 3 was produced by

(Manufacture of top coat)
The top coat paint 1 is prepared by mixing and stirring the matting agent A12 parts by weight, the matting agent B25 parts by weight, the film-forming aid 15 parts by weight, and the antifoaming agent 1 part by weight with respect to 200 parts by weight of the synthetic resin emulsion C. Manufactured.

Example 1
The following painting was performed sequentially on the concrete exposed surface after 3 years of casting.
(1) The repair material 1 was troweled with a coating amount of 1 kg / m ^{2 on the} defect portion.
(2) After drying at room temperature for 24 hours, colored transparent paints 1 to 3 were alternately applied to the repaired part and its peripheral part with a commercially available sponge. At this time, a blur was applied so that the hue of the hue gradually changed.
The appearance obtained by the above painting was finished with no noticeable discomfort with the surrounding concrete surface, with no noticeable repaired parts. I was able to finish the painting process in a short time.

(Example 2)
The following coating was sequentially performed on the concrete exposed surface as in Example 1.
(1) The repair material 1 was troweled with a coating amount of 1 kg / m ^{2 on the} defect portion.
(2) After drying at room temperature for 24 hours, the colored transparent paints 1 to 3 were alternately applied to the repaired part and its peripheral part with the application tool shown in FIG. At this time, a blur was applied so that the hue of the hue gradually changed.
The appearance obtained by the above painting was finished with no noticeable discomfort with the surrounding concrete surface, with no noticeable repaired parts. In Example 2, a finish with higher aesthetics than Example 1 could be obtained. I was able to finish the painting process in a short time.

(Example 3)
The following coating was sequentially performed on the concrete exposed surface as in Example 1.
(1) The repair material 1 was troweled with a coating amount of 1 kg / m ^{2 on the} defect portion.
(2) After drying at room temperature for 24 hours, the undercoat paint 1 was spray-coated on the entire surface at a coating amount of 0.2 kg / m ² .
(3) After drying at room temperature for 4 hours, the colored transparent paints 1 to 3 were alternately applied with a commercially available sponge to the repaired part and its peripheral part. At this time, a blur was applied so that the hue of the hue gradually changed.
The appearance obtained by the above painting was finished with no noticeable discomfort with the surrounding concrete surface, with no noticeable repaired parts. In Example 3, a finish with higher aesthetics than Example 1 could be obtained. I was able to finish the painting process in a short time.

Example 4
The following coating was sequentially performed on the concrete exposed surface as in Example 1.
(1) The repair material 1 was troweled with a coating amount of 1 kg / m ^{2 on the} defect portion.
(2) After drying at room temperature for 24 hours, the undercoat paint 1 was spray-coated on the entire surface at a coating amount of 0.2 kg / m ² .
(3) After drying at room temperature for 4 hours, the colored transparent paints 1 to 3 were alternately applied with a commercially available sponge to the repaired part and its peripheral part. At this time, a blur was applied so that the hue of the hue gradually changed.
(4) After drying at room temperature for 4 hours, the top coating material 1 was spray-coated at a coating amount of 0.12 kg / m ² on the entire surface.
The appearance obtained by the above painting was finished with no noticeable discomfort with the surrounding concrete surface, with no noticeable repaired parts. In Example 4, a finish with higher aesthetics than Example 1 could be obtained. I was able to finish the painting process in a short time.

(Comparative Example 1)
The following coating was sequentially performed on the concrete exposed surface as in Example 1.
(1) The repair material 2 was troweled at a coating amount of 1 kg / m ^{2 on the} defect portion.
(2) After drying at room temperature for 24 hours, colored transparent paints 1 to 3 were alternately applied to the repaired part and its peripheral part with a commercially available sponge. At this time, a blur was applied so that the hue of the hue gradually changed.
In this painting, the repaired part became a single color like paint, so it took a lot of work to get a finish without any discomfort by tapping.

(Comparative Example 2)
The following coating was sequentially performed on the concrete exposed surface as in Example 1.
(1) The repair material 3 was troweled at a coating amount of 1 kg / m ^{2 on the} defect portion.
(2) After drying at room temperature for 24 hours, colored transparent paints 1 to 3 were alternately applied to the repaired part and its peripheral part with a commercially available sponge. At this time, a blur was applied so that the hue of the hue gradually changed.
In this painting, the repaired portion was wet when struck, and it took a lot of work to obtain a finish without any discomfort.

It is a perspective view which shows an example of a hitting coating tool. It is sectional drawing of a hitting coating tool.

Explanation of symbols

1: Striking tool 2: Coating part 3: Base material part

Claims (3)

200 to 2000 parts by weight of at least two or more kinds of colored powders having an average particle diameter of 10 to 500 μm and different brightnesses are mixed with 100 parts by weight of the solid content of the organic binder, and the colored powders are mixed After repairing the missing part of the concrete exposed surface using the repair material adjusted to the concrete color by adjusting the ratio,
A method of painting a concrete exposed surface, characterized in that a repaired part and its peripheral part are struck using a colored transparent paint toned in concrete color. 200 to 2000 parts by weight of at least two or more kinds of colored powders having an average particle diameter of 10 to 500 μm and different brightnesses are mixed with 100 parts by weight of the solid content of the organic binder, and the colored powders are mixed Repair the missing part of the concrete exposed surface using the repair material adjusted to the concrete color by adjusting the ratio,
Then, after painting the undercoat on the entire surface including the repaired part,
A method of painting a concrete exposed surface, characterized in that a repaired part and its peripheral part are struck using a colored transparent paint toned in concrete color.   3. The method of painting a concrete exposed surface according to claim 1 or 2, wherein after the tapping is applied, a colorless transparent paint or a colored transparent paint is further applied as a top coat.

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