JP4118149B2 - How to repair ceramic tiles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing a ceramic tile surface used for exterior finishing of a building or the like.
[0002]
[Prior art]
Finishing with porcelain tiles such as porcelain tiles, porcelain tiles, semi-porcelain tiles, and porcelain tiles generally has good durability and design, so that it can protect buildings and other aesthetics. It is used favorably for improvement.
[0003]
However, in the case of a ceramic tile constructed for an exterior of a building or the like, it will be exposed for a long time in an environment affected by sunlight or wind and rain. As a result, deterioration such as reduction in gloss of the tile portion, fading, erosion, or neutralization or strength reduction of the joint portion proceeds. Furthermore, contamination proceeds due to airborne dust, floating pollutants such as exhaust gas, efflorescence and rust from the inside of the enclosure, and oil from the sealing material. For such ceramic tile surfaces, there is a need for refurbishment in order to restore durability, design and the like.
[0004]
As a method for repairing the ceramic tile surface, JP-A-6-33565 proposes a method of laminating a clear paint containing no pigment. In this invention, it is said that waterproofness can be imparted without changing the design of the existing ceramic tile surface by using the clear paint.
[0005]
The present invention can be applied to a ceramic tile surface whose degree of deterioration and contamination is slight. However, improve aesthetics on surfaces that have deteriorated significantly due to long-term exposure, or on surfaces that have become significantly contaminated and cannot be completely removed even after cleaning. The design problem cannot be solved.
[0006]
In order to cope with the problems of deterioration and contamination, there is a method of applying a colored paint to the ceramic tile surface. However, if the entire ceramic tile surface is painted with the same color, the contrast between the joint portion and the tile portion is lost, and the appearance becomes monotonous. In addition, when the existing tile has various patterns such as a spotted pattern, the pattern is also lost.
[0007]
There has also been proposed a method in which the joint portion and the tile portion are painted with paints of different colors, such as a method in which only the tile portion is painted by masking the joint portion after the entire ceramic tile surface is painted. However, such a method has a problem that the work process becomes complicated.
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-33565
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to obtain a repair method capable of enhancing the aesthetics of a ceramic tile surface that has deteriorated or contaminated while taking advantage of the design of the existing tile surface. It is what.
[0010]
[Means for Solving the Problems]
In order to solve such problems, the present inventors have intensively studied and found a method of spraying a colored transparent paint having a specific hiding ratio in a spot shape after coating a colored transparent paint having a specific hiding ratio. The invention has been completed.
[0011]
That is, the method for repairing ceramic tiles according to the present invention has the following characteristics.
1. A method of repairing ceramic tile surfaces by painting,
The ceramic tile surface includes a tile portion and a joint portion in a state where the mortar is exposed, and a colored transparent paint (A) having a concealment ratio of 0.10 to 0.60 is applied to the entire surface of the ceramic tile surface. The first step of painting, and then the second step of spraying the colored transparent paint (B) having a concealment ratio of 0.10 to 0.95 and having a hue different from that of the colored transparent paint (A) in the form of spots. The method of repairing ceramic tile surfaces, characterized by finishing by .
2. The colored transparent paint in the first step contains a hydrolyzable silyl group as a binder. The method of repairing the ceramic tile surface described.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the embodiments.
[0013]
The present invention is applied to a ceramic tile surface such as a building exterior.
Examples of the ceramic tile include a porcelain tile, a porcelain tile, a semi- porcelain tile, and a porcelain tile. The degree of deterioration and contamination of the tile surface is not particularly limited, and the tile surface may be deteriorated or contaminated significantly by long-term exposure. The present invention is particularly effective in repairing a ceramic tile surface having a speckled pattern.
Such a ceramic tile surface is generally formed by making a base with a base mortar on a base material, stretching ceramic tiles with a tension mortar, and filling the joints with joint mortar. Therefore, the joints between the ceramic tiles are usually in a state where the mortar is exposed.
[0014]
In the present invention, as the first step, a colored transparent paint (A) having a concealment ratio of 0.10 to 0.60 is applied to the entire surface.
This process makes it possible to keep the design characteristics of the existing ceramic tile surface, to make the stains and scratches generated on the tile portions inconspicuous, and to restore the hue, gloss, and the like damaged by aging. In addition, in this process, the paint is also applied to the joint, but the hue of the joint does not change much because the concealment ratio of the paint is set low. For this reason, the contrast between the tile portion and the joint portion can be maintained. It is also possible to improve the stain resistance, waterproofness, weather resistance, etc. of the entire tile surface.
[0015]
The concealment ratio of the colored transparent paint (A) used in the first step is 0.10 to 0.60 (preferably 0.20 to 0.50, more preferably 0.25 to 0.45). If the concealment rate of the colored transparent paint (A) is less than 0.10, there is a risk that the finish will be conspicuous with contamination, scratches, fading and the like. When the concealment ratio is larger than 0.60, it becomes difficult to make use of the design of the existing tile surface. Further, the contrast between the tile portion and the joint portion tends to be unclear, and the entire tile may have a monotonous appearance.
[0016]
The concealment ratio in the present invention is a value measured according to JIS K5400-1990 7.2 “Concealment ratio”. Specifically, the paint used at the time of painting (if diluted, the paint after dilution) is applied to the concealment rate test paper with a film applicator (gap 150 μm), and the temperature is 23 ° C and humidity is 50%. Is a value calculated by the following equation after measuring the luminous reflectance of the test piece dried for 48 hours.
<Formula> Hiding ratio = (luminous reflectance of black ground coating) / (luminous reflectance of white ground coating)
[0017]
The hue of the colored transparent paint (A) can be appropriately set within the range of the above-described concealment rate. In the case of finishing with the same color as the existing tile, the hue of the colored transparent paint (A) may be set to the same color as the base color of the existing tile portion according to the color pattern of the existing tile to be repaired. In addition, the hue can be completely different from that of the existing tile.
[0018]
The colored transparent paint (A) used in the first step usually contains a binder and a colorant as essential components.
[0019]
Examples of the binder include ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, silicon resin, fluorine resin, or a combination thereof. . These can be used alone or in combination of two or more.
In the present invention, a binder containing a hydrolyzable silyl group as a functional group is particularly suitable. If such a binder is used, the adhesiveness with respect to various ceramic tiles and joints can be exhibited by the function of the functional group.
Examples of binders containing hydrolyzable silyl groups include copolymers of hydrolyzable silyl group-containing vinyl monomers and other monomers, composites of various resins and silane coupling agents, etc. Is mentioned.
[0020]
Specifically, as the hydrolyzable silyl group-containing vinyl monomer, for example, γ- (meth) acryloxypropyltrimethoxysilane, γ- (meth) acryloxypropyltriethoxysilane, γ- (meth) acryloxy Examples thereof include propylmethyldimethoxysilane and γ- (meth) acryloxypropylmethyldiethoxysilane.
[0021]
Examples of the silane coupling agent include γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylmethyltriethoxysilane, β- (3,4 epoxycyclohexyl) ethyltrimethoxysilane, N-β (amino Ethyl) γ-aminopropylmethyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, and the like.
[0022]
Examples of the colorant include inorganic pigments such as titanium oxide, zinc oxide, carbon black, ferric oxide (bengara), yellow iron oxide, ocher, ultramarine, and cobalt green, azo, naphthol, pyrazolone, and anthraquinone. Organic pigments such as those based on perylene, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, and quinophthalone can be used. It is also possible to use extender pigments such as heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, white carbon, diatomaceous earth.
[0023]
Moreover, the component which can be normally used for a coating material other than the above-mentioned component can also be included. Examples of such components include aggregates, fibers, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreezing agents, pH adjusting agents, antiseptics, antifungal agents, and algaeproofing agents. , Antibacterial agents, dispersants, antifoaming agents, ultraviolet absorbers, antioxidants, catalysts, crosslinking agents and the like.
[0024]
The medium of the colored transparent paint (A) is not particularly limited, and a strong solvent system mainly containing an aromatic hydrocarbon solvent, a weak solvent system mainly containing an aliphatic hydrocarbon solvent, and water as a main ingredient. Various forms such as an aqueous system can be used.
[0025]
In the first step, such a colored transparent paint (A) is uniformly applied to the ceramic tile surface. A coating instrument is not specifically limited, Well-known coating instruments, such as a brush, spray, and a roller, can be used.
The amount applied when the colored transparent paint (A) is applied may be appropriately set in consideration of the type and state of the ceramic tile, but is usually about 50 to 300 g / m ² . With such a coating amount, a beautiful appearance can be obtained while fully utilizing the design of the existing tile surface.
[0026]
In the present invention, as a pretreatment of the first step, a process such as washing can be performed on the joint portion or the entire tile surface. Further, a transparent undercoat paint or the like can be applied as necessary.
[0027]
In the second step of the present invention, the concealment ratio is 0.10 to 0.95, and the colored transparent paint (B) having a hue different from that of the above-described colored transparent paint (A) is spray-coated in a spot shape. By this step, a spotted pattern is imparted to the tile portion, and the aesthetics are enhanced. In this process, the paint is also applied to the joint portion, but the contrast between the tile portion and the joint portion is maintained due to the fact that the concealment ratio of the paint is set to be low and the area effect due to the speckle coating.
[0028]
The hiding ratio of the colored transparent paint (B) used in the second step is 0.10 to 0.95 (preferably 0.30 to 0.90, more preferably 0.50 to 0.90). When the concealment ratio of the colored transparent paint (B) is in such a range, it is possible to impart a deep feeling of glazed tiles. When the concealment ratio of the colored transparent paint (B) is smaller than 0.10, it is difficult to improve the aesthetics of the tile portion due to the spotted pattern. If the concealment ratio is greater than 0.95, the spots applied to the joints will become conspicuous, and the contrast between the tiles and joints may become unclear.
[0029]
The hue of the colored transparent paint (B) in the second step is different from that of the above-described colored transparent paint (A). When the existing tile has a speckled pattern, the same finish as the existing tile can be obtained by setting the hue of the colored transparent paint (B) to the same color as the speckled pattern of the existing tile part, but it can also be a different hue. .
[0030]
The colored transparent paint (B) usually contains a binder and a colorant as essential components, and the same components as the above-mentioned colored transparent paint (A) can be used.
Among these, as the binder for the colored transparent paint (B), those containing a hydrolyzable silyl group are preferable in terms of adhesion, stain resistance, weather resistance, and the like.
[0031]
In the second step, the colored transparent paint (B) is spray-coated in the form of spots. A spray coating machine is used as a painting tool. The type of spray coating machine is not particularly limited as long as it can form a speckled pattern by adjusting the discharge amount, the atomizing pressure, the diameter, and the like.
The size, density, and the like of the spotted pattern can be appropriately set according to the desired finished appearance. Usually, the size of the speckled pattern is about 0.1 to 3 mm in diameter.
The amount applied when the colored transparent paint (B) is applied is usually about 1 to 100 g / m ² although it depends on the size and density of the speckled pattern.
In the case of displaying a spot pattern of a plurality of colors, a plurality of types of colored transparent paints (B) having different hues may be applied simultaneously or sequentially. Among these, when a plurality of types of colored transparent paints (B) are applied simultaneously, a multi-head spray gun or the like can be used as a coating instrument.
In the present invention, a transparent paint or the like can be applied as necessary after the second step.
[0032]
【Example】
Examples and Comparative Examples are shown below to clarify the features of the present invention.
[0033]
(Example 1)
Resin A (hydrolyzable silyl group-containing acrylic resin, weight average molecular weight 20000, solid content 55% by weight, mineral spirit solution) 65 parts by weight, curing agent (dibutyltin dilaurate) 0.5 part by weight, solvent (mineral spirit) 34. 5 parts by weight, 1 part by weight of titanium oxide, 0.2 part by weight of yellow iron oxide, 0.01 part by weight of bengara and 0.001 part by weight of carbon black are uniformly mixed in a conventional manner for the first step. The paint (A-1) was produced. The concealment rate of this paint (A-1) was 0.33.
In addition, 65 parts by weight of resin A, 0.5 parts by weight of a curing agent (dibutyltin dilaurate), 34.5 parts by weight of a solvent (mineral spirit), 0.2 parts by weight of yellow iron oxide, 0.4 parts by weight of bengara, carbon black 0. The paint (B-1) for the 2nd process was manufactured by mixing 1 weight part uniformly by a conventional method. The concealment rate of this paint (B-1) was 0.62.
[0034]
The joint is made of gray cement mortar, and the tile is made of porcelain tiles with a dark brown spotted pattern in ocher base color. The above paint (A-1) is applied to the tile surface after 5 years of construction. After uniformly spray-coating at a coating amount of 200 g / m ² , it was dried at room temperature (23 ° C.) for 3 hours. Subsequently, the paint (B-1) was spray-coated so that spots with a diameter of about 1 mm were scattered. The coating amount at this time was 10 g / m ² .
With the above coating, the aesthetics of the entire tile surface could be dramatically improved. The contrast between the tile part and the joint part in the finished appearance was also clear.
[0035]
(Comparative Example 1)
A paint (A-2) was produced by uniformly mixing 65 parts by weight of resin A, 0.5 parts by weight of a curing agent (dibutyltin dilaurate) and 34.5 parts by weight of a solvent (mineral spirit) by a conventional method. The concealment rate of this paint (A-2) was 0.03.
The paint (A-2) was uniformly spray-coated at a coating amount of 200 g / m ² on the same tile surface as in Example 1, and then dried at room temperature.
In the above coating, contamination remaining in the tile portion was exposed, resulting in poor aesthetics.
[0036]
(Comparative Example 2)
65 parts by weight of resin A, 0.5 parts by weight of curing agent (dibutyltin dilaurate), 34.5 parts by weight of solvent (mineral spirit), 2.6 parts by weight of titanium oxide, 0.5 parts by weight of yellow iron oxide, 0.03 parts by weight A paint (A-3) was produced by uniformly mixing 0.003 parts by weight of carbon black in a conventional manner. The concealment rate of this paint (A-3) was 0.74.
The paint (A-3) was uniformly spray-coated at a coating amount of 200 g / m ² on the same tile surface as in Example 1, and then dried at room temperature.
In the above coating, the contrast between the tile part and the joint part becomes unclear, resulting in a monotonous finish.
[0037]
【The invention's effect】
By applying the present invention to a ceramic tile surface that has deteriorated or contaminated, the aesthetics can be enhanced while taking advantage of the design of the existing tile surface.

Claims (2)

A method of repairing ceramic tile surfaces by painting,
The ceramic tile surface includes a tile part and a joint part in a state where the mortar is exposed,
For the ceramic tile surface,
The first step of coating the entire surface of the colored transparent paint (A) having a concealment ratio of 0.10 to 0.60, and then the concealment ratio of 0.10 to 0.95, and the colored transparent paint (A) A method for refurbishing a ceramic tile surface, which is finished by a second step of spray-coating a colored transparent paint (B) having a different hue from that of the first color.
The method for repairing a ceramic tile surface according to claim 1, wherein the colored transparent paint in the first step contains a hydrolyzable silyl group as a binder.