JP2023093116A - Repair method - Google Patents

Abstract

To provide a repair method having beauty appearance on an aggregate-containing decorative surface.SOLUTION: A repair method of an aggregate-containing decorative surface includes a step of coating a covering material which contains a synthetic resin and a brilliant pigment and has a thixotropic index value (TI value) of 1.5 or more onto an aggregate-containing decorative surface, and forming a design layer.SELECTED DRAWING: None

Description

The present invention relates to a method for refurbishing an aggregate-containing decorative surface.

2. Description of the Related Art Conventionally, decorative layers having various patterns are applied to walls of buildings, civil engineering structures, and the like. An example of such a decorative layer is a coated surface containing aggregate or a decorative surface such as a sheet, and the pattern (design) is diverse, such as stone tone, clay wall tone, and wood grain tone. Such decorative surfaces contain synthetic resins and aggregates, and deterioration over time may cause unevenness in color tone and luster, impairing aesthetics and requiring repair. In recent years, there have been many requests for large-scale remodeling and renovation, and there has been a demand for a finish with a new design that changes the image of the decorative surface.

As such a decorative surface refurbishing method, for example, Patent Document 1 describes a refurbishing method in which a water-based matte paint is applied to an uneven coating base containing aggregates.

JP 2019-104856 A

However, as in Patent Document 1, when a matte water-based paint is applied, uneven absorption occurs on the decorative surface containing the aggregate, and there is a risk of impairing the aesthetic appearance. Further, in Patent Document 1, only a single-color finish can be obtained, and no new design property is imparted.

The present invention has been made in view of such problems, and an object of the present invention is to provide a highly aesthetically pleasing method for repairing aggregate-containing decorative surfaces.

That is, the present invention has the following features.

1. A method for repairing an aggregate-containing decorative surface, comprising:
A step of forming a design layer by applying a coating material containing a synthetic resin and a bright pigment and having a thixotropic index value (TI value) of 1.5 or more;
A refurbishment method comprising:

ADVANTAGE OF THE INVENTION According to this invention, in the aggregate containing decorative surface, unevenness can be suppressed and the decorative surface excellent in aesthetics can be formed. In particular, it is possible to impart a new design property with glitter, and to form a decorative surface excellent in aesthetics while suppressing unevenness in glitter.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated.

The present invention is a method for refinishing an aggregate-containing decorative surface, characterized by including a step of forming a design layer having luster. INDUSTRIAL APPLICABILITY The present invention is a repair method suitable for cases such as when the aggregate-containing decorative surface has deteriorated over time or has some defects.

<Decorative surface containing aggregate>
The aggregate-containing decorative surface (hereinafter also referred to as "decorative surface" or "refurbished surface") to be subjected to the refurbishment method of the present invention includes, for example, a composition containing synthetic resin and aggregate (paint, coating material, finish material), or a decorative surface obtained by affixing a building material obtained by molding a composition containing a synthetic resin and an aggregate into a sheet or plate. Moreover, it may have some kind of protective layer on its surface.

The synthetic resin that constitutes the aggregate-containing decorative surface is not particularly limited, and any commonly available resin can be used. Examples of forms of such resins include solvent-soluble resins, non-water-dispersible resins, solvent-free resins, water-dispersible resins, and water-soluble resins. Examples of resin types include ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, phenol resin, melamine resin, amino resin, polycarbonate resin, acrylic silicone resin, Acrylic vinyl acetate resins, acrylic urethane resins, silicone resins, fluorine resins, etc., may be mentioned, and one or more of these may be used.

The aggregate is recognized to be granular, and for example, at least one selected from natural aggregate such as natural stone, pulverized natural stone, and artificial aggregate such as colored aggregate is preferably used. be able to. Specifically, for example, marble, granite, serpentinite, granite, fluorite, cold water stone, feldspar, silica, silica sand, pulverized products thereof, pulverized ceramics, pulverized ceramics, pulverized glass, glass beads, resins Examples include pulverized materials, resin beads, metal particles, and the like, and those whose surfaces are colored and coated. These can be used singly or in combination of two or more.

The particle size of the aggregate is set according to the pattern of the decorative surface, etc., preferably less than 5.6 mm (more preferably more than 20 μm and less than 4.75 mm, more preferably more than 25 μm and less than 2 mm, still more preferably more than 38 μm less than 850 μm). The particle size of the aggregate is measured by sieving using a metal mesh sieve specified in JIS Z8801-1:2019.

The mixing ratio of the resin and the aggregate is preferably 1 part by weight or more and 50 parts by weight or less (more preferably 2 parts by weight or more and 30 parts by weight) with respect to the total amount of 100 parts by weight of the aggregate in terms of solid content. below, more preferably 3 parts by weight or more and 25 parts by weight or less). With such a ratio, it is possible to obtain an aggregated pattern (for example, a stone texture pattern, etc.) having fine uneven shapes derived from the aggregate.

In addition, the aggregate-containing decorative surface may contain components (additives) other than those described above, if necessary, as long as the effects of the present invention are not significantly impaired. Examples of such components include plasticizers, anti-algae agents, antibacterial agents, deodorants, adsorbents, flame retardants, thickeners, antifoaming agents, cross-linking agents, coloring pigments, extender pigments, glitter pigments, Phosphorescent pigments, fluorescent pigments, fibers, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, and the like.

Furthermore, the aggregate-containing decorative surface of the present invention may have an uneven pattern such as a stone-like pattern, a wood-grain pattern, or a joint pattern on its surface. In the repairing method of the present invention, repairing can be performed while making use of these uneven patterns. The effect of the present invention can be sufficiently exhibited when the height difference of the unevenness is preferably within the range of 0.2 to 6 mm or less (more preferably 0.3 to 5.5 mm or less). In the present invention, "a to b" is synonymous with "a or more and b or less".

<Design layer>
The coating material forming the design layer of the present invention is characterized by containing a synthetic resin and a luster pigment. By forming such a design layer, it is possible to impart a new glittering design while utilizing the color of the aggregate-containing decorative surface.

As the synthetic resin, those having a transparent film can be used. Examples of the form of such resins include solvent-soluble resins, non-water-dispersible resins, solvent-free resins, water-dispersible resins, water-soluble resins, etc. Among these, water-dispersible resins (resin emulsions ) is preferred. Examples of resin types include acrylic resins, urethane resins, epoxy resins, vinyl chloride resins, vinyl acetate resins, acrylic silicon resins, fluorine resins, silicon resins, and composites thereof. These can be used singly or in combination of two or more. Such a resin may have the property of causing a cross-linking reaction.

A known luster pigment can be used. Examples thereof include metal flakes such as aluminum flakes and stainless steel flakes, and pearl pigments obtained by coating a flaky substrate with a metal oxide or a mixture thereof. These can be used singly or in combination of two or more.
The particle size (size) of the luster pigment may be appropriately selected depending on the desired color tone and luster (luminosity), and is preferably 1 to 800 μm (more preferably 5 to 700 μm). The thickness of the luster pigment is not particularly specified, but is preferably in the range of 0.1 μm to 10 μm. In such a case, excellent brilliance can be exhibited. The particle size of the bright pigment can be measured with a laser diffraction particle size distribution meter.

Furthermore, in the present invention, it is preferable to use luster pigments having different particle sizes in combination. In the present invention, "different particle sizes" means different upper limits and/or lower limits of particle sizes. As an embodiment of the design layer in which luster pigments having different particle sizes are used in combination, for example, a design layer formed by sequentially applying a coating material containing a luster pigment of particle size A and a coating material containing a luster pigment of particle size B. , or a design layer formed by applying a coating material containing luster pigments of particle size A and particle size B, and the like. In the present invention, in the latter case, it is possible to obtain a design that is even more excellent in brightness.

In the present invention, it is preferable to use a pearlescent pigment as the luster pigment. As the pearl pigment, for example, a silver-colored pearl pigment, a gold-colored pearl pigment, an interference-colored pearl pigment, or the like can be used, and among them, a silver-colored pearl pigment is preferable.

Examples of flaky substrates for pearl pigments include pulverized naturally occurring mica, industrially synthesized mica, glass flakes, silica flakes, alumina flakes, barium sulfate, and the like. These can be used singly or in combination of two or more. Examples of metal oxides that coat the flaky substrate include titanium dioxide, silicon dioxide, iron oxide, aluminum oxide, zirconium oxide, cobalt oxide, zinc oxide, tin oxide, chromium oxide, and nickel oxide. . These can be used singly or in combination of two or more.

Moreover, when pearl pigments having different particle sizes are used, it is preferable that they have the same color tone, so that a highly aesthetic design with uniform brilliance can be obtained. For example, in the case of a silver-colored pearl pigment, the particle size is preferably 5-600 μm (more preferably 10-500 μm). In this case, it is possible to obtain a strong silver tone (metallic tone) brilliance. Further, it is preferable to use together those having different particle sizes within the above range. As one aspect thereof, for example, a pearl pigment having a particle size with a lower limit of 5 μm or more and less than 50 μm and an upper limit of 50 μm or more and 400 μm or less and a pearl pigment with a lower limit of 10 μm or more and less than 100 μm and an upper limit of 100 μm or more and 600 μm or less may be used in combination. . As a result, a metallic design having uniform and strong brilliance can be obtained.

The mixing ratio of the bright pigment is preferably 0.1 to 50 parts by weight (more preferably 0.3 to 45 parts by weight, still more preferably 0.5 to 40 parts by weight) with respect to 100 parts by weight of the synthetic resin. be. In such a case, it is possible to obtain a highly aesthetic design having uniform brilliance.

The dressing of the present invention is characterized by having a thixotropic index value (TI value) of 1.5 or more (preferably 1.8 to 8.0, more preferably 2.0 to 6.0). In the present invention, by setting the viscosity characteristics of the coating material to such conditions, it is possible to suppress uneven absorption into the aggregate-containing decorative surface, so that it is possible to form a uniform design layer along the unevenness. can. In addition, the stability of the bright pigment in the coating material is enhanced, and a design layer in which the bright pigment is uniformly dispersed along the unevenness can be formed without the bright material being unevenly distributed in the concave portions on the decorative surface. Thereby, it is possible to obtain a design having luster (metallic tone, etc.) without gloss unevenness.

In addition, the TI value in the present invention is a value obtained by the following (Equation 1) using a BH type rotational viscometer.
(Formula 1) TI value = η1/η2
however,
η1: Viscosity at 2 rpm (Pa s: guideline value for second rotation, measurement temperature: 23°C)
η2: Viscosity at 20 rpm (Pa s: guideline value at 4th rotation, measurement temperature: 23°C)

Also, the viscosity of the coating material of the present invention is preferably 0.3 to 10 Pa·s (more preferably 0.5 to 8 Pa·s). The viscosity in the present invention is a value obtained by measuring the viscosity (guideline value at the 4th rotation) at 20 rpm with a BH type viscometer (measurement temperature: 23°C).

As a method for setting the TI value of the coating material within the above range, it is preferable to add a thickening agent. Examples of thickeners include organic thickeners and inorganic thickeners. In the present invention, it is preferred that an inorganic thickener is included.

Examples of organic thickeners include hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, alkali swelling thickeners, hydrophobic modified alkali swelling thickeners. Viscous agents, urethane associative thickeners and the like are included. These can be used singly or in combination of two or more.

Examples of inorganic thickeners that can be used include inorganic layered compounds, silica aerosil, and fumed silica. In the present invention, it is preferable that an inorganic layered compound is included. Examples of inorganic layered compounds include natural or synthetic smectite clay minerals such as bentonite, montmorillonite, hectorite, saponite, sauconite, beidellite, and nontronite; magnesium aluminum silicate; derivatives modified from organic polymers such as These can be used singly or in combination of two or more.

Further, the inorganic thickener of the present invention preferably has a transmittance of 90% or more in a 1% dispersed aqueous solution. Furthermore, the particle size of the inorganic layered compound contained in the inorganic thickener is preferably 5 to 50 nm, and the thickness is preferably 0.5 nm to 2 nm. In such a case, the effects of the present invention can be fully exhibited without impairing the transparency of the design layer formed by the covering material.

Furthermore, the coating material may optionally include, for example, coloring pigments (excluding the above brightening pigments), extender pigments, anti-algae agents, antibacterial agents, deodorants, adsorbents, flame retardants, antifoaming agents, film-forming agents, Auxiliaries, antifreeze agents, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, and the like can be blended.

The design layer of the present invention is formed by applying a coating material containing the luster pigment. When the design layer is provided directly on the surface of the aggregate-containing decorative surface, it is possible to impart a new lustrous design while making the best use of the color of the aggregate-containing decorative surface. For example, when the decorative surface is monochromatic, it is possible to impart uniform luster, and when the decorative surface is multicolored, it is possible to impart various luster with different color tones and different brightnesses. . The coating material may be applied to any portion on the surface of the aggregate-containing decorative surface, but is preferably applied to the entire surface. Known instruments such as sprays and rollers can be used to apply the coating material. In addition, the coating material can be diluted with various solvents at the time of application, and the solid content at the time of application is preferably 10 to 80% by weight (more preferably 15 to 60% by weight), and per unit area is preferably 10 to 500 g/m ² (more preferably 20 to 300 g/m ² ). Also, the number of times of application is preferably 1 to 2 times. In such a case, the effects of the present invention can be fully exhibited. The coating material may be hardened by natural drying, or may be forcibly hardened by applying heat or the like.

In the refurbishment method of the present invention, any color can be given by providing a colored layer on the surface of the aggregate-containing decorative surface before forming the design layer. Such a colored layer can be formed by applying and drying a colored coating material containing a resin component and a colored pigment. By having a colored layer, a metallic design having a desired color tone can be obtained.

Examples of resin components include acrylic resins, urethane resins, vinyl acetate resins, urethane resins, silicone resins, fluorine resins, acrylic vinyl acetate resins, acrylic urethane resins, acrylic silicone resins, etc. One or two of these resins may be used. More can be used. As such a resin component, a water-soluble resin and/or a water-dispersible resin are preferable.

Commercially available or known materials can be used as the coloring pigment, and examples include titanium oxide, zinc oxide, alumina, magnesium oxide, zirconium oxide, yttrium oxide, indium oxide, carbon black, and ferric oxide (red oxide). ), inorganic coloring pigments such as yellow iron oxide, iron oxide, ultramarine blue, cobalt green; iron-chromium composite oxide, manganese-bismuth composite oxide, manganese-yttrium composite oxide, manganese-iron-cobalt composite oxide Composite oxide pigments; organic coloring pigments such as azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, and quinophthalone pigments; , one or more of these can be used. In addition to such color pigments, extender pigments such as barium sulfate, calcium carbonate, silicon oxide and magnesium oxide can also be used.

The colored coating material may contain various components other than the components described above as long as the effects of the present invention are not significantly impaired. Such components include, for example, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, preservatives, antifungal agents, antialgae agents, antibacterial agents, and dispersants. agents, antifoaming agents, cross-linking agents, ultraviolet absorbers, antioxidants, and the like.

Further, the colored coating material preferably has a thixotropic index value (TI value) of 1.5 or more (preferably 1.8 to 8.0, more preferably 2.0 to 6.0). As a result, uneven absorption into the aggregate-containing decorative surface can be suppressed, and a uniform colored layer can be formed.

The colored coating material may be applied to an arbitrary portion of the aggregate-containing decorative surface, but is preferably applied to the entire surface. Known tools such as a brush, roller, and spray can be used as the coating tool. The amount of the colored coating material to be applied when forming the colored layer is preferably 10 to 500 g/m ² (more preferably 20 to 300 g/m ² ) in terms of solid content.

Furthermore, in the repair method of the present invention, after forming the design layer, a clear coat material is applied to the outermost surface for the purpose of surface protection, weather resistance improvement, stain resistance, etc., as long as the effects of the present invention are not hindered. In addition, a colorless and transparent clear layer may be provided. This makes it possible to further enhance the brilliance (feeling of brightness). As such a clear layer, a known clear paint can be used, but it is preferable to use the same synthetic resin emulsion as the design layer. As a result, the transparency is less likely to be lowered, and the brilliance (luminosity) can be further enhanced by the lens effect of the clear layer.

It is preferable to apply the clear paint over the entire surface. Known tools such as a brush, roller, and spray can be used as the coating tool. The coating amount of the coating material when forming the colored layer is preferably 10 to 500 g/m ² (more preferably 20 to 300 g/m ² ) in terms of solid content.

Examples are shown below to further clarify the features of the present invention.

<Decorative surface containing aggregate>
The following decorative surface was used after being deteriorated by exposure to the outdoors.
・Cosmetic surface 1
A decorative surface (sandstone pattern, uneven pattern) formed on a base material (slate plate) by a finishing material containing 20 parts by weight of acrylic resin per 100 parts by weight of aggregate (particle size: 200 μm to 400 μm). Height difference (maximum value): 3.0 mm, color tone: whitish).
<Covering material>
・Covering material 1
Acrylic resin emulsion (solid content: 50% by weight) 200 parts by weight, bright pigment 1 (silver-colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 20 to 200 μm) 15 parts by weight, water 150 parts by weight, additives ( Coating material 1 (TI value: 0.9) containing a film-forming aid, etc.).
・Covering material 2
200 parts by weight of acrylic resin emulsion (solid content: 50% by weight), 15 parts by weight of luster pigment 1 (silver-colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 20 to 200 μm), 1 part by weight of synthetic smectite clay mineral, Coating material 2 (TI value: 1.9) containing 150 parts by weight of water and additives (coating agents, etc.).
・Covering material 3
200 parts by weight of acrylic resin emulsion (solid content: 50% by weight), 15 parts by weight of luster pigment 1 (silver-colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 20 to 200 μm), 2 parts by weight of synthetic smectite clay mineral, Coating material 3 (TI value: 2.5) containing 150 parts by weight of water and additives (coating agents, etc.).
・Covering material 4
200 parts by weight of acrylic resin emulsion (solid content: 50% by weight), 15 parts by weight of luster pigment 1 (silver-colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 20 to 200 μm), 2.5 parts by weight of synthetic smectite clay mineral parts, 150 parts by weight of water, and an additive (film-forming aid, etc.) (TI value: 5.5).
・Covering material 5
200 parts by weight of acrylic resin emulsion (solid content: 50% by weight), 15 parts by weight of luster pigment 2 (silver-colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 45 to 500 μm), 2 parts by weight of synthetic smectite clay mineral, Coating material 5 (TI value: 2.5) containing 150 parts by weight of water and additives (coating agents, etc.).
・Covering material 6
Acrylic resin emulsion (solid content: 50% by weight) 200 parts by weight, glitter pigment 1 (silver-colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 20 to 200 μm) 7.5 parts by weight, glitter pigment 2 (silver Colored pearl pigment, rutile-type titanium oxide-coated mica, particle size 45 to 500 μm) 7.5 parts by weight, synthetic smectite clay mineral 2 parts by weight, water 150 parts by weight, coating material 6 containing additives (film-forming aids, etc.) (TI value: 2.5).

(Examples 1 to 6, Comparative Example 1)
Using the combination shown in Table 1, the coating material was applied to the decorative surface (weight per unit area: 100 g/m ² ) and cured (at 23°C for 3 hours) to form a design layer, and the decorative surface was repaired. bottom. In Example 5, the first coating material 3 was applied at a weight per unit area of 50 g/m ² and cured (at 23°C for 3 hours), and the second coating material 5 was applied per unit area. It was applied at a weight of 50 g/m ² and cured (at 23°C for 3 hours) to form a design layer and repair the decorative surface. The cosmetic surface after repair was visually observed, and the following evaluations were made.

(Evaluation method)
・Aesthetics 4 grades: "A" for excellent aesthetics with no unevenness in color or brightness (sense of brightness), and "D" for those with unevenness in color or brightness (sense of brightness). (Excellent: A>B>C>D: Poor).
・Luminance 4 grades, with “A” for excellent brightness and “D” for poor brightness (Excellent: A>B>C>D: Poor)

In Examples 1 to 6, it was possible to obtain a silver metallic design with no color unevenness or brightness unevenness. In particular, in Examples 2 to 6, a highly aesthetic design with uniform brilliance was obtained.

(Example 7)
On the decorative surface, a blue colored coating material (20 parts by weight of phthalocyanine blue for 200 parts by weight of acrylic resin emulsion (solid content: 50% by weight), additives (film-forming aids, etc.) is included. TI value: 2.2 ) was spray-coated at a coating amount of 150 g/m ² (solid content) to form a colored coating layer, and after curing for 1 day, coating material 6 was applied (weight per unit area: 100 g/m ² ) and cured. (at 23°C for 3 hours) to form a design layer and repair the decorative surface. An excellent design with a blue metallic uniform brilliance that made use of the underlying blue color was obtained. When the same evaluation as above was performed, the aesthetic appearance was "A" and the brightness was "A".

Claims (1)

A method for repairing an aggregate-containing decorative surface, comprising:
A step of forming a design layer by applying a coating material containing a synthetic resin and a bright pigment and having a thixotropic index value (TI value) of 1.5 or more;
A refurbishment method comprising: