JP3097900B2 - How to paint exposed concrete surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating the surface of exposed concrete in a building showing exposed concrete with exposed concrete.

More specifically, the exposed concrete surface was coated with a water-repellent transparent water-based paint, and the resulting color unevenness and defective portions were sprayed with a foundation using a silica-based inorganic paint or patterned with a black paint. Thereafter, the present invention further relates to a method for coating a bare concrete surface, which further comprises applying a water-repellent transparent paint.

[0003]

2. Description of the Related Art Heretofore, public facilities such as schools and government offices, or buildings where artistic properties are required, such as art museums and museums, have been preferably used with exposed concrete surfaces.

In such a case, it is important not to allow water to enter the concrete in order to prevent the concrete from carbon gas in the air, vehicle exhaust gas, acid rain and salt damage. Painting has been widely practiced.

[0005] Even in such a case, it is important not to lose the feeling of the exposed concrete, and for that purpose, it has been required to finish it with a translucent type.

A method of applying a water-repellent translucent paint to the concrete surface in order to prevent the neutralization and weathering of the concrete and to enhance the appearance without impairing the feeling of the exposed concrete surface as exposed. Has been done.

[0007]

However, in such a conventional method, although it plays a sufficient role in protecting the concrete surface, the surface of the aesthetic appearance is on the concrete surface and has not been conspicuous until now. However, there is a problem that the broken portion and the splice unevenness appear clearly by applying the translucent paint.

In view of the above, the present invention has developed a new treatment method for a defective portion, a splice unevenness, and the like that occur in a conventional method for coating a bare concrete surface, and is excellent not only in protection of the concrete surface but also in appearance. It is an object of the present invention to provide a method for coating a bare concrete surface which is inexpensive in terms of construction cost.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a water-repellent transparent water-based paint on a bare concrete surface, and applies a silica-based inorganic paint to the generated color unevenness and defective portions. After performing a foundation coating using the above method and patterning with a black paint, a water-repellent transparent paint is further applied.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the coating method according to the present invention, first, a defective portion or the like found by checking the base is repaired in advance with a resin mortar or the like, and the repaired portion is smoothed with a sander or sandpaper so as to be smooth around a window. After curing a place such as a ceiling which is not coated with a vinyl sheet or an adhesive tape, the first coating with a water-repellent transparent water-based paint such as a silica-based water-repellent paint is performed.

The first application of the water-repellent transparent water-based paint performed in this manner repairs inconspicuous repairs such as junka and chips, stains such as rust juice and veneer juice, and extremely black stains on concrete. Defects such as defects and color unevenness due to cold joints and the like come up quite clearly, and these are partially applied with foundation using a concrete-colored silica-based inorganic paint using a cup gun.

Then, if necessary, a concrete pattern is applied to a blackboard eraser plate with felt using a black paint, or a brush having a diameter of about 50 mm for metal painting is used to perform patterning.

In this way, it is confirmed that the wind is entirely blown off, and the second time the water-repellent transparent water-based paint is applied, the object is achieved.

[0014]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not affected at all.

As the water-repellent transparent water-based coating used in the present invention, generally available and used coatings can be used, but silica-based water-repellents are suitable.

For the foundation coating of the present invention, a silica-based inorganic coating having the following composition is suitable.

Styrene / alkyl acrylate copolymer 48% emulsion 69 parts by weight Fine particle calcium carbonate 43 Calcium bicarbonate 130 Silica fine powder 43 Colloidal silica 30% solution 16 Iron oxide yellow 0.1 Iron oxide black 1.0 Iron oxide Red rust color 0.1 Thickener 14 Shimizu 69 Total 385 parts by weight The above mixture can be obtained by stirring and mixing with a dissolver or the like for 3 to 5 hours. As the paint resin component of the paint, other commercially available acrylic resins can be widely used. Also, acrylic silicone emulsion and polymer alloy can be used.

As the black paint used for patterning of the present invention, the following paint can be used.

A vinylidene chloride / alkyl acrylate copolymer 50% 1000 parts by weight Water 1500 A 10% solution of iron oxide black dispersed in glue 2 Also, the following resin mortar for repair is suitable. .

Ordinary Portland cement 20 parts by weight White cement 30 Silica powder 50-70 Vinyl acetate emulsion 10% aqueous solution 50-100 Among the above blends, the powder formulation is first mixed uniformly, and then the vinyl acetate 10% aqueous solution is made uniform To obtain a mixture.

FIGS. 1 to 3 show a process of repairing a cold joint a generated on the surface of concrete 1 as an example of repairing color unevenness according to the present invention.

As shown in FIG. 1, the cold joint a is a white band-like color unevenness that occurs when concrete is cast in winter, but as shown in FIG. After spraying and applying a thin foundation coating b around the cold joint a and applying a baking, as shown in FIG. 3, the patterning c is performed using a black paint while checking the balance with the surrounding exposed surface. Let it.

FIG. 4 to FIG. 6 show the processing of the repaired trace of the partial repair of the concrete 1. As shown in FIG. When a water-repellent transparent water-based paint is applied, the color often becomes different (usually black). For this purpose, as shown in FIG. 5, a silica-based foundation coat is usually blown only on the repaired part to blur. By the foundation painting f
If the color does not match the exposed surface, spray a little on the surrounding area to blur.

If it is not noticeable, patterning is not necessary, but if it is noticeable, look at the balance with the surroundings,
As shown in FIG. 6, patterning g is performed.

FIG. 7 and FIG. 8 show the processing of the repair trace of the entire repair of the concrete 1. For example, when the entire surface is repaired in units of veneer, the color often becomes different (usually black) when the water-repellent transparent water-based paint is applied. In this case, too, as shown in FIG. The foundation paint h is applied by wiping the entire surface while observing the surrounding colors, and the pattern i is applied as a whole as shown in FIG.

[0026]

As described above, by carrying out the method according to the present invention, it is possible to easily realize a highly attractive and powerful concrete surface protection without impairing the feeling of being exposed.

[Brief description of the drawings]

FIG. 1 shows a concrete surface where a cold joint has occurred.

FIG. 2 shows the concrete surface of FIG. 1 in a state of foundation coating.

FIG. 3 shows the concrete surface of FIG. 1 showing patterning.

FIG. 4 shows the concrete surface with partial repair marks remaining.

FIG. 5 shows the foundation-coated concrete surface of FIG. 4;

FIG. 6 shows the patterned surface of the concrete of FIG. 4;

FIG. 7 shows the surface of concrete where repair marks remain for full repair.

8 shows the foundation-painted concrete surface of FIG. 7;

FIG. 9 shows the patterned concrete surface of FIG. 7;

[Explanation of symbols]

 1 Concrete b, f, h Foundation painting c, g, i Patterning

────────────────────────────────────────────────── (5) References JP-A-57-200275 (JP, A) JP-A-55-51461 (JP, A) JP-A-6-292858 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (1)

(57) [Claims] 1. After the exposed concrete surface is coated with a water-repellent transparent water-based paint, the resulting color unevenness or defective portion is subjected to foundation coating using a silica-based inorganic paint and patterning with a black paint. And a water-repellent transparent paint.