JP2004232407A - Repair method for ceramic tile surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: moisture and the like in cleaning sometimes remain on a ceramic tile surface; water content is easily increased, particularly, on the ceramic tile surface where a tile itself has water absorbing properties and where waterproof performance of a joint part is insufficient; when deterioration makes extreme progress due to long-term exposure even on the surface where a water absorption rate is low at the beginning of construction, the easy absorption of the moisture is caused; and when repair is performed by applying normal paint to the ceramic tile surface in such a state, close adhesion performance intrinsic in the paint is not exerted owing to the moisture remaining inside so that the peeling, blistering, etc. of a coated film can be caused. <P>SOLUTION: Paint (B) including a nonaqueous resin as a binder is applied after the ceramic tile surface is coated with a surface treatment agent (A) which is composed of a 1-100 wt% of dehydrating agent and a 0-99 wt% of nonaqueous solvent. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD 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 ceramic tiles, such as porcelain tiles, ceramic tiles, semi-porcelain tiles, and ceramic tiles, generally has good durability and good design, so it is necessary to protect the building, Used favorably for improvement.
[0003]
However, in the case of a ceramic tile constructed for exterior use of a building or the like, the ceramic tile is exposed for a long time under an environment affected by sunlight, wind and rain. As a result, the ceramic tile portion of the ceramic tile surface (hereinafter, also referred to as “tile portion”) may have reduced gloss, fading, erosion, or neutralization of the joint portion (hereinafter, also referred to as “joint portion”) of the ceramic tile surface. Deterioration such as reduction in strength proceeds. With respect to such a ceramic tile surface, there is a need for renovation in order to restore durability, design, and the like.
[0004]
However, such a ceramic tile surface may contain a large amount of moisture due to the effects of rainfall, dew condensation, and the like. In some cases, moisture is taken in from the back surface of the skeleton. Further, in the repair of the ceramic tile surface, cleaning is usually performed with water, a detergent, an acid solution, or the like, but water at that time may remain. In particular, the water content tends to be high on a ceramic tile surface where the tile itself has water absorbency or the joint portion has insufficient waterproof performance. Even if the surface is low in water absorption at the beginning of construction, if the deterioration progresses significantly due to long-term exposure, moisture is likely to be absorbed.
When the ceramic tile surface in such a state is repaired with a normal paint, the original adhesion performance of the paint will not be exhibited due to the effect of the moisture remaining inside, causing peeling, swelling, etc. of the paint film. There is.
[0005]
Japanese Patent Publication No. 7-94764 describes a method of sequentially applying a permeable waterproof material, a water repellent material, and a waterproof coating material on a ceramic tile surface. However, it is difficult to solve the above-mentioned problems caused by moisture by the method described in this publication.
[0006]
[Patent Document 1] Japanese Patent Publication No. 7-94764
[Problems to be solved by the invention]
The present invention has been made in view of such a problem, and in the repair of a ceramic tile surface, a coating method capable of exhibiting excellent adhesion even when moisture remains on the ceramic tile surface is obtained. It is intended for that purpose.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, the present inventors have conducted intensive studies and, as a result, applied a surface treatment agent of a specific composition to a ceramic tile surface, and then applied a paint using a non-aqueous resin as a binder. The present invention has been completed and the present invention has been completed.
[0009]
That is, the method for repairing a porcelain tile surface of the present invention has the following features.
1. For ceramic tile surface,
After applying a surface treatment agent (A) consisting of 1 to 100% by weight of a dehydrating agent and 0 to 99% by weight of a non-aqueous solvent, a paint (B) containing a non-aqueous resin as a binder is applied. How to renovate ceramic tiles.
2. It is a method of repairing the ceramic tile surface by painting,
A first step of cleaning the surface of the ceramic tile surface,
A second step of applying a surface treating agent (A) comprising 1 to 100% by weight of a dehydrating agent and 0 to 99% by weight of a non-aqueous solvent,
A third step of applying a paint (B) containing a non-aqueous resin as a binder,
A method for repairing a ceramic tile surface comprising:
3. The paint (B) is a colored transparent paint (B ′) further containing a colorant and having an opacity of 0.10 to 0.60. Or 2. Repair method of ceramic tile surface described in.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on its embodiments.
[0011]
The present invention is applied to a ceramic tile surface such as a building exterior.
Examples of the type of ceramic tile include porcelain tile, clay tile, semi-porcelain tile, and ceramic tile. These may be either glazed tiles whose surfaces are glazed or unglazed tiles that are not glazed. Further, the degree of such deterioration or contamination of the tile surface is not particularly limited, and may be such that the deterioration or contamination has been significantly advanced by long-term exposure.
The present invention is particularly effective when the ceramic tile is an unglazed tile.
[0012]
Such a ceramic tile surface is generally formed by forming a base on a base material with a base mortar, setting a ceramic tile on a base mortar, and filling the joint with a joint mortar. Therefore, the joints between the ceramic tiles are usually in a state where the mortar is exposed.
[0013]
In the present invention, the surface of the ceramic tile surface can be cleaned before applying the surface treatment agent (A). That is, a first step of cleaning the surface of the ceramic tile surface, a second step of applying the surface treatment agent (A), and a third step of applying the paint (B) can be sequentially performed.
In the present invention, even if moisture remains due to such a washing step, poor adhesion of the formed coating film can be suppressed. For this reason, the coating process can be started without waiting for the ceramic tile surface to be completely dried after washing, which is advantageous in terms of shortening the construction period.
[0014]
In the cleaning step, a method capable of removing contaminants attached to the surface of the ceramic tile surface may be employed. Examples of the washing method include high-pressure water washing with water, washing with a washing liquid, and the like, and a combination thereof can also be used. Among them, the cleaning liquid can be appropriately selected according to the type and surface condition of the ceramic tile, the type of pollutant, the degree of contamination, and the like. As components contained in the detergent, for example, anionic surfactants, nonionic surfactants, cationic surfactants, surfactants such as amphoteric surfactants, sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, citric acid And fluorine compounds such as ammonium hydrogen fluoride, ammonium fluoride and ammonium silicofluoride. When a cleaning agent is used, it is usually washed with water to prevent deterioration residues, contaminants, detergent components, etc. from remaining on the ceramic tile surface and joints.
[0015]
In the present invention, the surface treatment agent (A) composed of 1 to 100% by weight of a dehydrating agent and 0 to 99% by weight of a non-aqueous solvent is applied to remove water from the ceramic tile surface. In the present invention, by treating the ceramic tile surface with such a surface treating agent (A), a coating film having excellent adhesion can be formed even when moisture remains on the ceramic tile surface. Can be. Therefore, peeling, swelling, and the like of the formed coating film can be prevented for a long time.
[0016]
Examples of the dehydrating agent in the surface treatment agent (A) include trialkyl orthoformate, trialkyl orthoacetate, trialkyl orthoborate, and monoisocyanate compounds. Among them, the trialkyl orthoformate includes trimethyl orthoformate, triethyl orthoformate, tributyl orthoformate and the like. Examples of the trialkyl orthoacetate include trimethyl orthoacetate, triethyl orthoacetate, and tributyl orthoacetate. Examples of the trialkyl orthoborate include trimethyl orthoborate, triethyl orthoborate, and tributyl orthoborate. Examples of the monoisocyanate compound include phenyl isocyanate, p-chlorophenyl isocyanate, benzenesulfonyl isocyanate, p-toluenesulfonyl isocyanate, and isocyanate ethyl methacrylate.
[0017]
As the dehydrating agent in the surface treatment agent (A), one or more selected from trimethyl orthoformate, triethyl orthoformate, tributyl orthoformate, trimethyl orthoacetate, triethyl orthoacetate, and tributyl orthoacetate are particularly suitable. Such compounds produce esters and alcohols by a chemical reaction with the water remaining on the ceramic tile surface. For example, in the case of trimethyl orthoacetate, methyl acetate and methanol are produced.
When the above-mentioned compound is used as a dehydrating agent, the compound itself has volatility, and the reaction product (ester and alcohol) with the remaining water also has volatility and easily volatilizes in the atmosphere. Therefore, it is preferable because it does not adversely affect the physical properties of the formed coating film.
[0018]
Examples of the non-aqueous solvent include alcohol solvents such as methanol, ethanol, propanol, isopropanol and butanol, ethylene glycol, propylene glycol, butylene glycol, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, and ethylene glycol monoethyl ether acetate. Glycol solvents, n-hexane, n-pentane, n-octane, n-nonane, n-decane, n-undecane, n-dodecane, terpin oil, aliphatic hydrocarbon solvents such as mineral spirits, toluene, xylene And aromatic hydrocarbon solvents such as solvent naphtha, and others, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, and the like.
[0019]
The content of the dehydrating agent in the surface treatment agent (A) is usually 1 to 100% by weight, preferably 2 to 80% by weight. The content of the non-aqueous solvent in the surface treatment agent (A) is usually 0 to 99% by weight, preferably 20 to 98% by weight. If the amount of the dehydrating agent is less than 1% by weight, a large amount of a surface treating agent must be used to remove water from the ceramic tile surface, which is not efficient.
In the surface treatment agent (A), a catalyst may be mixed for the purpose of promoting the reaction between the dehydrating agent and moisture. Further, other additives and the like can be mixed as needed.
[0020]
The application amount of the surface treatment agent (A) may be appropriately set in consideration of the type and state of the target ceramic tile surface, and is usually about 30 to 300 g / m ² . When applying the surface treatment agent (A), various devices such as a brush, a spray, and a roller may be used.
When the surface of the ceramic tile is washed, even if water remains in the surface of the ceramic tile, the surface treatment agent (A) can be applied as long as the surface is dry.
[0021]
In the present invention, the paint (B) is applied after applying the surface treatment agent (A) to the ceramic tile surface. The interval between the step of applying the surface treatment agent (A) and the step of applying the paint (B) is not particularly limited, and the paint (B) is applied immediately after the application of the surface treatment agent (A). Alternatively, the paint (B) may be applied after the surface treatment agent (A) has dried.
[0022]
The coating material (B) contains a non-aqueous resin as a binder.
The non-aqueous resin in the paint (B) is a resin using an organic solvent other than water as a medium. The type of the medium is not particularly limited, and a strong solvent mainly containing an aromatic hydrocarbon solvent, a weak solvent mainly containing an aliphatic hydrocarbon solvent, or the like can be used.
Examples of the non-aqueous resin include, for example, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, silicone resin, fluororesin, and the like, or a combination thereof. Can be 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 preferable. When such a binder is used, adhesion of the binder to various ceramic tiles and joints can be enhanced by the function of the functional group.
Examples of the binder containing a hydrolyzable silyl group include, for example, copolymers of a hydrolyzable silyl group-containing vinyl monomer and other monomers, and composites of various resins and a silane coupling agent. Is mentioned.
[0023]
Specifically, as a hydrolyzable silyl group-containing vinyl monomer, for example, γ- (meth) acryloxypropyltrimethoxysilane, γ- (meth) acryloxypropyltriethoxysilane, γ- (meth) acryloxy Propylmethyldimethoxysilane, γ- (meth) acryloxypropylmethyldiethoxysilane and the like.
[0024]
Examples of the silane coupling agent include γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylmethyltriethoxysilane, β- (3,4 epoxycyclohexyl) ethyltrimethoxysilane, and N-β (amino Ethyl) γ-aminopropylmethyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane and the like.
[0025]
The paint (B) in the present invention may be either a transparent paint or a colored paint. Also, the degree of gloss is not particularly limited.
[0026]
When the paint (B) is used as a coloring paint, a coloring agent can be mixed in addition to the above components. Examples of the coloring agent include inorganic pigments such as titanium oxide, zinc oxide, carbon black, ferric oxide (red iron oxide), yellow iron oxide, ocher, ultramarine, cobalt green, etc., azo, naphthol, pyrazolone, and anthraquinone. And organic pigments such as perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine and quinophthalone. It is also possible to use extenders such as heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, white carbon, and diatomaceous earth.
[0027]
In the present invention, in particular, as the paint (B), a colored transparent paint (B) having an opacity of 0.10 to 0.60 (preferably 0.20 to 0.50, more preferably 0.25 to 0.45) ') Is preferred. If such a colored transparent paint (B ') is used, the design of the existing ceramic tile surface is maintained, the stains and scratches generated on the tile portion are made inconspicuous, and the hue damaged by aging and Gloss etc. can be restored. In addition, in this step, the paint is also applied to the joints, but the hue of the joints does not change much because the concealment ratio of the paint is set to be low. For this reason, the contrast between the tile portion and the joint portion can be maintained.
[0028]
The concealment ratio in the present invention is a value measured according to JIS K5400-1990 7.2 “Occlusion ratio”. Specifically, the paint to be used at the time of painting (when dilution is performed, the diluted paint) is applied to the opacity test paper with a film applicator (a gap of 150 μm). Is a value calculated by the following equation after measuring the luminous reflectance of the test piece dried for 48 hours at
<Formula> Opacity = (visual reflectance of coating on black ground) / (luminous reflectance of coating on white ground)
[0029]
The hue of the colored transparent paint (B ') can be appropriately set within the above-mentioned hiding ratio. When finishing with a color similar to the existing tile, the hue of the colored transparent paint (B ') may be set to a color similar to 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 the existing tile.
[0030]
The coating material (B) may contain, in addition to the components described above, components that can be generally used in coating materials. Such components include, for example, aggregates, fibers, thickeners, film-forming auxiliaries, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, preservatives, fungicides, and algaecides , An antibacterial agent, a dispersant, an antifoaming agent, an ultraviolet absorber, an antioxidant, a catalyst, a crosslinking agent, a dehydrating agent, and the like.
[0031]
The coating of the paint (B) is usually performed on the entire ceramic tile surface, but may be performed on only one of the tile portion and the joint portion of the ceramic tile surface.
The coating amount of the paint (B) may be appropriately set in consideration of the type and state of the ceramic tile surface to be coated, and is usually about 50 to 300 g / m ² . The coating device is not particularly limited, and a known coating device such as a brush, a spray, and a roller can be used.
In the present invention, after applying the paint (B), a paint having a hue different from that of the paint (B) may be spray-painted in a spot shape. By performing such coating, a spot pattern can be provided on the tile portion.
[0032]
【Example】
Examples and comparative examples are shown below to further clarify the features of the present invention.
[0033]
(Example 1)
A surface treating agent (A-1) was produced by uniformly mixing 10 parts by weight of trimethyl orthoacetate and 90 parts by weight of a solvent (ethanol) by a conventional method.
Further, 65 parts by weight of resin A (hydrolyzable silyl group-containing acrylic resin, weight average molecular weight 20,000, solid content of 50% by weight, mineral spirit solution), 0.5 part by weight of curing agent (dibutyltin dilaurate), solvent (mineral spirit) A coating material (B-1) was produced by uniformly mixing 34.5 parts by weight in a conventional manner. The hiding ratio of this paint (B-1) was 0.03.
[0034]
The joint is made of gray cement mortar and the tile is made of clay tile (unglazed) with a base color of ocher and a dark brown spot pattern. The ceramic tile surface (150 x 200 mm) 5 years after construction is tested The substrate was used.
The surface of the test substrate was washed with a cleaning liquid containing a nonionic surfactant as a main component, and further washed with water. After leaving at room temperature (23 ° C.) for 2 hours, the surface treatment agent (A-1) was first spray-coated at a coating amount of 100 g / m ² . Next, after left at room temperature for 1 hour, the paint (B-1) was spray-coated at a coating amount of 200 g / m ² and dried at room temperature for 168 hours.
The test plate obtained by the above process was immersed in warm water of 50 ° C. for 72 hours, and then its appearance was confirmed. Further, the adhesion was evaluated by a grid tape method (4 × 4 mm × 25 squares).
As a result, no abnormality was particularly observed in the test plate of Example 1.
[0035]
(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), 1 part by weight of titanium oxide, 0.2 parts by weight of yellow iron oxide, 0.01 of red iron oxide By weight, 0.001 part by weight of carbon black was uniformly mixed by a conventional method to prepare a paint (B-2). The hiding ratio of this paint (B-2) was 0.33.
[0036]
The test was performed in the same manner as in Example 1 except that the paint (B-2) was used instead of the paint (B-1). As a result, no abnormalities were observed.
[0037]
(Comparative Example 1)
Using the same test substrate as in Example 1, the surface was washed with a cleaning solution containing a nonionic surfactant as a main component, and further washed with water. After leaving at room temperature for 2 hours, the coating material (B-1) was spray-coated at a coating amount of 200 g / m ² and dried at room temperature for 168 hours.
When the same test as in Example 1 was performed on the test plate obtained by the above steps, swelling of the coating film occurred. Also, the result was poor adhesion.
[0038]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in the renovation of a ceramic tile surface, the outstanding adhesiveness can be exhibited even if the water remains on the ceramic tile surface.

Claims (3)

For ceramic tile surface,
After applying a surface treating agent (A) consisting of 1 to 100% by weight of a dehydrating agent and 0 to 99% by weight of a non-aqueous solvent, a paint (B) containing a non-aqueous resin as a binder is applied. How to renovate ceramic tiles. It is a method of repairing the ceramic tile surface by painting,
A first step of cleaning the surface of the ceramic tile surface,
A second step of applying a surface treating agent (A) comprising 1 to 100% by weight of a dehydrating agent and 0 to 99% by weight of a non-aqueous solvent,
A third step of applying a paint (B) containing a non-aqueous resin as a binder,
A method for repairing a ceramic tile surface comprising: The paint (B) is a colored transparent paint (B ') having a hiding ratio of 0.10 to 0.60, which further contains a coloring agent, and is a colored transparent paint (B') according to claim 1 or 2. Renovation method.