JP3205868B2 - Concrete decorative formwork and concrete coloring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative concrete formwork, and more particularly to a concrete decorative formwork for applying a pattern such as irregularities and coloring to a concrete surface to be constructed, and a method of coloring concrete.

[0002]

2. Description of the Related Art In recent years, it has frequently been practiced to improve the aesthetic appearance of buildings, retaining walls, and the like by providing a concavo-convex pattern on a concrete surface. The construction method for that purpose is also disclosed in, for example, JP-A-59-158825 and JP-A-63-10
Many proposals have been made, such as Japanese Patent No. 7510. However, in these construction methods, only a pattern is expressed on the surface of concrete, and coloring is not performed simultaneously with the construction. If you want to color the concrete surface,
After the pattern was revealed by the above construction method, the paint had to be applied there.

[0003] Japanese Patent Publication No. 6-102584 discloses a proposal that can simultaneously color a concrete surface while performing construction. This publication discloses a polymer of polyethylene oxide (molecular weight of about 100,000 to 5,000,000) produced by ring-opening polymerization of ethylene oxide, a dye or a pigment or a mixture thereof, and a surfactant produced by a fermentation method. A 30-200 μm concrete infiltration layer containing the composition
A coloring agent for concrete attached to a substrate such as paper or synthetic resin and a coloring method are described.

[0004]

However, when a concrete colorant containing a polymer of polyethylene oxide, a colorant, and the like as described above is adhered to the surface of a decorative form, the above-mentioned makeup at a construction site is not obtained. If there is rainfall during transportation, loading, or during installation of the formwork, the colorant for concrete will flow, causing problems such as insufficient colorant components to be transferred or penetrated to the concrete surface. There was a case. This is presumed to be because the polymer component of polyethylene oxide as described above is rich in hydrophilicity and thus has excellent permeability to concrete, but easily flows down due to water such as rainfall. It takes time and effort to manage the colorant components so that they do not flow down due to such rainfall and the like, and also requires restrictions during construction.

[0005] In addition, because of its excellent permeability to concrete, coloring at the time of concrete placement for preventing the formation of cavities using a vibrator or the like, which is performed at the time of placing concrete after attaching the decorative formwork, is performed. The coloring agent to be transferred to the concrete surface where the agent component flows out into the cast concrete tends to cause unevenness, which may result in a spotted pattern. This is presumed to occur because the use time of the vibrator for preventing the occurrence of cavities varies depending on the construction site and the operator.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. That is, the present invention provides, on the surface of the decorative mold body on the concrete casting side, a copolymer composition containing oxyethylene groups, oxypropylene groups and maleic anhydride as essential components, a water-soluble adhesive, a dye and / or A decorative decorative formwork characterized by applying a coloring mixture containing a coloring agent composed of a pigment. As described above, in the present invention, by introducing an oxyethylene group having excellent hydrophilicity into the copolymer composition contained in the coloring mixture, the permeability of the coloring component to the concrete surface before drying is appropriately maintained. In addition, by introducing a hydrophobic oxypropylene group, it is possible to prevent the colorant component from flowing down into the poured concrete by the use of a vibrator to prevent water from falling due to rainfall or the use of a vibrator to prevent cavitation. Thus, at the same time as applying a uniformly colored makeup to the concrete surface to be applied, a decorative pattern such as unevenness can be applied to the surface.

Further, in the method for coloring concrete according to the present invention, the above-mentioned decorative concrete formwork is used, the formwork is assembled at a work place, concrete is poured, and after the concrete is cured, the formwork is removed. By doing so, the constructed concrete surface is close to natural stone,
There you can color close to natural stone. Therefore, even if it is concrete, it is possible to easily create a wall surface on which natural stones are stacked.

The copolymer composition contained in the coloring mixture used in the present invention contains oxyethylene groups, oxypropylene groups and maleic anhydride as essential components, such as Maria Rim (trade name, manufactured by NOF Corporation). Is mentioned. This mariarim is represented by the following chemical formula.

[0009]

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Note that R ₁ in the above chemical formula comprises an oxyethylene group and an oxypropylene group, and the oxyethylene group and the oxypropylene group may be polymerized alternately, blockwise, or randomly. R ₂ in the above chemical formula is a hydrocarbon group having 1 to 8 carbon atoms. Also, n
Is about 30 on average, m is about 10 on average, and the total molecular weight is about 1
It is preferably from 000 to 15,000.

The ratio of the oxyethylene group to the oxypropylene group in the copolymer composition is determined by the hydrophilicity for maintaining the permeability of the coloring component to the concrete surface, the falling due to rainfall or the like, and the flowing out into the concrete. In order to maintain moderately the opposite property of hydrophobicity that prevents
Particularly, the ratio (molar ratio) between the oxyethylene group and the oxypropylene group is preferably 15 to 60 and 85 to 40, respectively.

As the water-soluble adhesive contained in the coloring mixture used in the present invention, for example, polyethylene oxide,
Many such as sodium alginate, carboxymethylcellulose, hydroxyethylcellulose, polyvinyl alcohol, dextrin, modified starch and the like can be mentioned.

The dyes and pigments contained in the coloring mixture used in the present invention are those having excellent weather resistance, alkali resistance and heat resistance, such as titanium oxide, yellow iron oxide, iron black, iron oxide powder, cobalt oxide, and the like. Violet, ultramarine, chromium oxide, copper oxide, phthalocyanine blue, and the like.

Copolymer composition containing oxyethylene group, oxypropylene group and maleic anhydride contained in the coloring mixture used in the present invention, a water-soluble adhesive, a coloring agent comprising a dye and / or a pigment, The mixing ratio thereof is preferably an aqueous solution containing 0.5 to 5 parts by weight of the copolymer composition and 0.5 to 3 parts by weight of the water-soluble adhesive with respect to 10 to 35 parts by weight of the colorant. preferable. This means that when the colorant is changed to 10 to 35 parts by weight depending on various colors,
When the copolymer composition is contained in excess of 5 parts by weight, the water resistance is increased, but on the other hand, the bonding between the concrete applied after the application and the decorative formwork body becomes strong, and it becomes difficult to transfer the coloring component to the concrete. Yes, the copolymer composition is 0.5
More preferably, it is set to 3 parts by weight. Similarly, if the water-soluble adhesive is contained in an amount exceeding 3 parts by weight, a film is formed and it is difficult to peel off the decorative form main body. In addition, a dispersant, a penetrant, a thickener, and the like can be appropriately added to the coloring mixture used in the present invention.

The decorative mold body used in the present invention may be formed of a material such as expanded polystyrene, expanded polyethylene, expanded polypropylene, expanded styrene-modified polyolefin, paper, rubber, etc., and formed with an uneven pattern. On the concrete casting surface of these decorative formwork bodies,
It is a preferable embodiment to partition a unit shape such as a rock, and to form a joint protrusion for revealing a joint,
For example, a unit shape partitioned by joints can be made to be close to natural stone.

As described above, the concrete decorative formwork of the present invention is characterized in that an oxyethylene group, an oxypropylene group and maleic anhydride are essential on the surface of the decorative formwork body on the concrete casting side. A colored mixture obtained by appropriately mixing a polymer composition, a water-soluble adhesive, and a coloring agent composed of a dye and / or a pigment is applied. In addition, the concrete coloring construction method of the present invention uses the concrete decorative formwork described above, assembles the formwork in a construction site, casts concrete, and after curing the concrete, removes the formwork, The surface of the concrete that has been applied can be made similar to natural stone, and at the same time, a color close to natural stone can be colored there. Therefore, even if it is concrete, it is possible to easily create a wall surface on which natural stones are stacked.

[0017]

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. (Embodiment 1) FIG. 1 shows one concrete panel 1
The foamed polystyrene layer 2 is adhered to the surface of the foamed polystyrene layer 2, and the surface of the foamed polystyrene layer 2 is formed with irregularities opposite to the irregular pattern appearing on the concrete surface to form a decorative form body a.
Is composed. The formwork a is provided with joint projecting portions 3 for presenting joints for dividing a unit shape such as rock on the surface of the cast concrete. And
On the surface of the expanded polystyrene layer 2, 35 parts by weight of a brown pigment (Brown 3515P, manufactured by Nikko Chemical Laboratory Co., Ltd.) were used, and the ratio of oxyethylene groups to oxypropylene groups in the composition was 50:50. Polymerization composition A (manufactured by NOF Corporation, trade name: Marialim AFB) 50% by weight
The ratio of oxyethylene groups to oxypropylene groups is 2
5:75 copolymer composition B (manufactured by NOF CORPORATION,
(Trade name: Marialim ACM) and 50% by weight, 2 parts by weight of a mixture obtained from Nippon Shokubai Chemical Co., Ltd. as a water-soluble adhesive, trade name: 1 part by weight of Gohsenol GH17R, and Nippon Oil & Fats Co., Ltd. as a dispersant A trade name: Nymeen L207, 0.5 part by weight, and 61.5 parts by weight of distilled water were mixed with a coloring mixture by a spray gun to obtain a concrete decorative form on which a coloring mixture layer 4 was formed. .

Example 2 A concrete decorative formwork was prepared in the same manner as in Example 1 except that the same amount of pine gold (trade name, manufactured by Matsutani Chemical Co., Ltd.) was used as the water-soluble adhesive contained in the coloring mixture. Obtained.

Comparative Example 1 The procedure of Example 1 was repeated except that the copolymerizable composition A and the copolymerizable composition B contained in the coloring mixture were not used, and that 63.5 parts by weight of distilled water was used. A concrete decorative form was obtained.

Comparative Example 2 Nippon Shokubai Kagaku Co., Ltd., trade name: Gohsenol GH17R was used as the water-soluble adhesive without using the copolymer composition A and the copolymer composition B contained in the coloring mixture. A concrete decorative formwork was obtained in the same manner as in Example 1 except that 3 parts by weight were used.

Comparative Example 3 A water-soluble adhesive manufactured by Nippon Shokubai Kagaku Co., Ltd., trade name: Gohsenol GH17R, was used in the same manner as in Example 1 except that 63.5 parts by weight of distilled water was used. A concrete decorative form was obtained.

(Evaluation of Water Resistance) Using the obtained decorative concrete formwork, a water resistance test was carried out by the following method. A device capable of dropping a certain amount of water by making many holes was prepared. Tilted to about 60 °, arranged so that the upper surface is the surface coated with the coloring mixture, and using the above-mentioned device,
For 5 minutes, an amount of water equivalent to rainfall of 150 mm was dropped on the surface to which the coloring mixture was applied, and the degree to which the coloring agent flowed off due to water and peeled off was observed to evaluate the water resistance.

As a result, the decorative decorative molds obtained in Examples 1 and 2 did not cause any coloring agent to flow off and peel off. On the other hand, in the concrete decorative molds obtained in Comparative Examples 1 and 2, the coloring agent flowed off at a rainfall of about 5 mm and peeled off. Further, the decorative decorative formwork obtained in Comparative Example 3 did not have any coloring agent flowing down and peeling off.

Next, the obtained concrete decorative form a
Was assembled with the concrete panel 5 opposite to the above, fixed with fasteners 6. And
As shown in FIG. 2, 14% of cement, 80% of aggregate,
After casting concrete composed of 7% water and using a vibrator (not shown) to prevent cavitation, cure the concrete for 4 days, remove the formwork, and visually check the coloring of the concrete surface. Was evaluated by. In addition,
The working time of the vibrator was changed to 60 seconds, 90 seconds, and 120 seconds, respectively.

The results show that the colored state of the concrete surface using the concrete decorative formwork obtained in Example 1 and Example 2 is a uniform colored surface without any coloring unevenness or partial color omission. Vibrator usage time is 60 seconds,
It was good for both 90 seconds and 120 seconds. On the other hand, the colored state of the concrete surface using the decorative concrete molds obtained in Comparative Example 1 and Comparative Example 2 shows that the vibrator was used for 90 seconds or 120 seconds, and partial color omission occurred. (Light-colored part) occurred. In addition, the coloring state of the concrete surface using the concrete decorative formwork obtained in Comparative Example 3 was insufficiently colored, the colorable mixture applied to the concrete decorative formwork remained, and the transfer was not sufficiently performed. Was. Furthermore, the colored layer on the concrete surface using the concrete decorative formwork obtained in Example 1 and Example 2 did not fall off even if it was strongly washed with water.

[0026]

As described above, the present invention provides a copolymer composition containing oxyethylene groups, oxypropylene groups and maleic anhydride as essential components on the surface of a decorative formwork body on the concrete casting side. A decorative concrete formwork to which a coloring mixture containing a water-soluble adhesive and a coloring agent comprising a dye and / or a pigment is applied, wherein the copolymer composition contained in the coloring mixture contains an oxy group having excellent hydrophilicity. By introducing an ethylene group, while maintaining the permeation of the coloring component to the concrete surface before drying moderately, and by introducing a hydrophobic oxypropylene group, it flows down due to water such as rainfall, The use of a vibrator to prevent the occurrence prevents the colorant component from flowing into the cast concrete and uniformly colors the concrete surface to be applied. At the same time the makeup applied when it is possible to apply a beautiful makeup patterns such as unevenness to the surface.

Further, by using the concrete decorative formwork of the present invention, assembling the formwork in a construction place, placing concrete, curing the concrete, and removing the formwork, the coloring work of the concrete can be easily performed. Can do it.

[Brief description of the drawings]

FIG. 1 is a sectional view of a concrete decorative formwork and a concrete panel before placing concrete.

FIG. 2 is a cross-sectional view of a state where concrete is cast between the decorative formwork and the panel of FIG.

[Explanation of symbols]

a: decorative formwork body, 2: expanded polystyrene layer, 3: joint projection, 4: concrete permeation layer, 5: concrete panel

Continuation of the front page (56) References JP-A-9-272836 (JP, A) JP-B-6-102584 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 9 / 10 101 C04B 41/00

Claims (2)

(57) [Claims] 1. A copolymer composition comprising oxyethylene groups, oxypropylene groups and maleic anhydride as essential components, a water-soluble adhesive, a dye and / or A decorative concrete formwork, characterized by applying a coloring mixture containing a coloring agent comprising a pigment. 2. A concrete using the concrete decorative formwork according to claim 1, assembling the formwork at a construction site, casting concrete, and curing the concrete, and then removing the formwork. Coloring construction method.