JP2974113B2 - Paint composition for colored concrete and formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint composition for colored concrete using a mold and a mold material for molding colored concrete.

[0002]

2. Description of the Related Art Concrete moldings (hereinafter simply referred to as concrete) have been used in many buildings as structural materials having excellent strength and durability. However, since the appearance of concrete is gray, the concrete is gray. Due to incongruity with the surrounding environment, the demand for colored concrete as a landscape material has been increasing in recent years. Various types of concrete coloring materials are required, from relatively small ones such as color blocks and color flat plates to large-scale civil engineering works such as seawalls and dikes.

Conventionally, as a method of coloring concrete, a method using a color cement, a method using a coloring agent such as a pigment, a method using a colored aggregate, and the like are known.
As a method of coloring the surface of concrete, a method of applying various finish coating materials to the surface has also been used.

[0004]

However, in the method of coloring the concrete itself, although a uniform colored layer is obtained inside, the so-called efflorescence phenomenon occurs on the surface. There is a problem that the aesthetic appearance of the concrete surface is impaired because it differs depending on the type of aggregate, the amount of kneading water and the construction conditions. Further, as a material of the mold, there are wooden, metal, plastic, rubber and the like, but poor curing due to soluble alkali in the wood,
Due to metal rust stains, mold release failure from the mold, etc.
This impairs the appearance of the concrete surface and makes it difficult to reuse the formwork.

[0005] For this reason, the concrete surface after the mold release may be finished and surface-finished by sharpening, washing out, beating, sand plasting, etc., but such a surface treatment significantly increases the cost. It is inevitable to become. On the other hand, the method of painting the surface of concrete with paint is a method that has been practiced for a long time. Deterioration in weather resistance becomes a problem, and furthermore, if the coating layer on the surface is lacked due to some physical action for surface coating, there is a problem that the uncolored concrete surface layer is exposed and the appearance is impaired.

Accordingly, the performance of colored concrete is as follows:
Artificial structures such as buildings, roads, and bridges are required to be in harmony with the environment surrounding colored concrete, such as greenery, waterfronts, topography, and cities. Accordingly, an object of the present invention is to solve the problems of the prior art relating to colored concrete and to provide colored concrete close to natural stone efficiently and economically.

[0007]

The above object is achieved by the present invention described below. That is, the present invention, binder and Ri Ru coating composition der name and a colorant and a liquid medium, the binder has a property of dissolving readily in acidic At及beauty in resistance condition is stable and alkaline conditions Characterized in that a colored coating layer is formed by applying the coating composition in advance on the surface of a mold to form a colored coating layer, and then cast concrete into the mold to produce a colored concrete structure. coating composition, and a colored concrete molding form, characterized in that the coating composition was subjected paint.

[0008]

[Action] In the mold enforcement method concrete, when pouring concrete in a mold, the surface of the pre-mold, is stable in acidic <br/>及beauty in of conditions and under alkaline conditions A colored concrete structure that has a surface texture similar to that of natural stone by forming a colored coating film that dissolves in water, casting concrete in this formwork, curing, and releasing. Things are easily provided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. As the mold used in the present invention, any of wooden, metal, plastic, rubber and concrete molds can be used.

[0010] The present invention provides a method for manufacturing a color image forming apparatus, comprising the steps of:
Acidified及beauty in resistance conditions is stable in and of alkaline
The colored coating layer is formed by either the binder and liquid medium <br/> Ranaru coating composition having a property of dissolving the condition, when concrete is in this mold, alkaline water-soluble substance in the cement The coloring coating layer dissolves, and the coloring components penetrate into the surface of uncured concrete, coloring the surface layer of the concrete structure, preventing the formwork and concrete from sticking, and improving the releasability after curing. It is.

[0011] The binder used in the coating composition of the present invention may be those which the resulting coating film which dissolves in acidic及stable in in of conditions beauty and alkaline conditions in readily water, Examples thereof include emulsions of vinyl acetate, acrylic, urethane, and polyester resins, water-soluble resins, and mixtures thereof.

The concrete to be cast may be an uncolored one, but it is preferable to use a colored concrete of the same color as the colored coating, so that the concrete after coloring may be damaged or damaged due to chipping or cracking. It is possible to obtain a colored concrete structure having no change on the concrete surface even when the surface is deteriorated due to long-term exposure.

As the coloring material, any of pigments, dyes and the like can be used. However, coloring materials having alkali resistance and good affinity with cement are suitable, and general inorganic pigments and organic dyes can be used. In addition to dyes and pigments, special functional powders such as fluorescent pigments and infrared absorbing pigments, and particle diameters of 0.5 to 3 such as colored silica sand
It is also possible to change the function and finish of the concrete surface using aggregates of about mm.

[0014]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In the description, parts or% are based on weight. Example 1 Brown concrete [Painting composition 1] Pigment (Bengara, iron black) 8 parts Binder (vinyl acetate emulsion) 60 parts Water 32 parts

The paint of Formulation 1 was applied to the surface of a synthetic resin mold by spraying to a coating thickness of 50 μm and air-dried for 12 to 24 hours. [Concrete mix 1] Portland cement 20 parts Pigment (Bengara, iron black) 2 parts Aggregate 60 parts Water 18 parts The above-mentioned concrete mix 1 is poured into a synthetic resin form having the colored coating film formed thereon. After curing for 3 days, when the mold was removed, both the surface and the inside were colored brown.

Comparative Example 1 Concrete composition 1 was poured into a synthetic resin form without a coating layer, and after curing for 3 days, the form was removed.
Although the inside was colored brown, the surface was whitish and uneven. In addition, a part of the concrete adhered to the mold at the time of release from the mold, the surface of the concrete became rough, and the mold could not be reused.

Example 2 Green concrete [Painting composition 2] Pigment (Dipiroxide Color Green # 9310) 20 parts Binder (acrylic water-soluble resin) 50 parts Water 30 parts The coating composition 2 was coated on the surface of a metal mold. Was applied to a thickness of 30 μm by spraying and air-dried for 12 to 24 hours.

[Concrete Mix 2] Portland cement 20 parts Pigment (Dipoxide Color Green # 9310) 4 parts Aggregate 60 parts Water 16 parts Concrete mix 2 is cast on a metal mold on which the colored coating film is formed. After curing for 3 days, the mold was removed and the surface and inside were colored green.

COMPARATIVE EXAMPLE 2 In the paint formulation 2 of Example 2, a paint using an acrylic emulsion resin which forms a stable film under alkaline conditions as a binder is applied to the surface of a metal mold by spraying. Apply 30 μm and air dry for 12-24 hours. Concrete mixture 2 was poured into the mixture, and after curing for 3 days, the mold was removed. As a result, the coating film adhered to the mold, and the concrete surface was not colored.

Comparative Example 3 A commercially available green exterior cement-based spraying material was sprayed on the surface of uncolored concrete to produce a colored concrete. When each of the concrete structures of Example 2 and Comparative Example 2 was exposed outdoors for one year, the appearance of the concrete structure of Example 2 hardly changed, whereas the concrete structure of Comparative Example 2 was changed. The surface was remarkably changed, and the surface texture was inferior.

[0021]

Since the coating film formed from the coating composition of the present invention is essentially completely dissolved by the alkaline substance in the concrete milk, the surface layer after hardening of the concrete is a so-called "polymer cement mixed concrete layer". "
, Which not only significantly improves the strength as compared to a normal concrete surface, but also suppresses the occurrence of efflorescence due to exposure.
Incidentally, the coating film obtained by the coating composition of the present invention may be acidic or acidic.
Does not dissolve the soluble condition in beauty, never the coating film was subjected coated in the mold are washed away by rain or the like during construction outdoors.

Claims (2)

(57) [Claims] That Do and a 1. A binder and a colorant and a liquid medium
The coating composition der is, strip the binder is acidic及beauty in resistance
Characterized in that it is stable in the case and has the property of easily dissolving under alkaline conditions.
A colored concrete coating composition for producing a colored concrete structure by applying the coating composition to form a colored coating film layer and casting concrete in the formwork. 2. A method according to claim 1 colored concrete molding form a coating composition, characterized in that given a coating according to.