JPH0471870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a beautiful and durable concrete column whose surface is coated with colored and/or patterned resin, and a method for producing the same. be.

(Prior Art) Concrete columns having colored and/or patterned surfaces have been known. Note that the concrete column mentioned in this specification is a concrete column including concrete poles, piles, and humid pipes. The following two methods have been generally used for coloring and/or adding patterns to concrete columns, such as concrete poles.

One method is to apply a colored paint to the entire surface or a part of the surface of a hardened concrete column to form a color or pattern thereon. Another method is to add a pigment to the concrete material to form a hardened colored concrete column, and then form a transparent resin coating on the surface of the hardened concrete to obtain colored concrete.

However, it has long been pointed out that coloring and/or patterning concrete columns using this method has extremely low productivity; It is also true that the quality was not necessarily satisfactory.

That is, in the former method of forming a colored coating film on a hardened concrete column, after the hardened concrete column is demolded, it is maintained at a product storage area for a certain period of time to maintain an appropriate moisture content. This is generally done by curing the product in a storage area for three weeks or more, but this management is not always easy due to the influence of rain and other factors. After that, we remove mold release agents, dirt, rust, and other substances that are harmful to the paint, such as mold release agents, dirt, and rust that have adhered to the surface of the concrete column. Furthermore, the white substance that has precipitated from the concrete columns must be removed, and the base must be finished with paper to improve adhesion of the paint. The white substance referred to here is the so-called primary efflorescence of the concrete column, which is caused by soluble salts such as calcium hydroxide contained in the concrete mixing water leaching onto the surface of the concrete column during the hardening process. , which is deposited on the surface after water evaporates. After such pretreatment, an undercoat sealer is applied to the surface of the concrete column, and various paints depending on the purpose are applied one to three times using a brush or a sprayer. These operations are performed on all coated surfaces.
The labor involved was becoming a huge burden.

On the other hand, in the latter method, a hardened colored concrete is obtained from the beginning, and a transparent resin coating is applied onto this. This coats the surface of the concrete column and at the same time prevents water from entering and exiting from the outer surface of the concrete column, thereby preventing secondary efflorescence. If water enters from the outside after forming the concrete column, secondary efflorescence will occur in the same manner as the above-mentioned primary efflorescence, which will significantly deteriorate the appearance. However, in this case as well, the substrate must be subjected to complicated pre-treatments before painting, which is similar to the above case, and the labor involved is similarly a heavy burden.

However, in both cases, even if such complicated pretreatment is carefully carried out, since concrete, which is an inorganic material, is post-coated with an organic material, paint,
The adhesive strength between the paint film and concrete is weak, and as the paint film deteriorates over time, it often develops cracks, blisters, etc., and further peels off. This made it difficult to maintain beautiful concrete columns over a long period of time. In addition, coating concrete columns with a colored resin coating is used to improve the aesthetic appearance and to prevent so-called salt damage on the coast, but in such cases, if the coating cracks or blister, it may affect the aesthetic appearance. Along with the decline, it became impossible to meet these demands for preventing salt damage.

Furthermore, when we look at products in which colored concrete columns are obtained by adding pigments to the raw materials and coated with a resin film, colored concrete columns and non-colored ordinary concrete columns can be produced at the same time using the same manufacturing equipment. If manufacturing was to be carried out at different times during the day, there was a problem in that the manufacturing equipment had to be thoroughly washed each time to ensure that no pigmented concrete remained. This has also been pointed out as a major problem that lowers the workability of conventional methods.

(Problems to be Solved by the Invention) In the present invention, a colored and/or patterned resin coating is coated on the surface of a centrifugally formed concrete column with strong adhesion strength, and primary efflorescence and The purpose of this invention is to significantly simplify the process after demolding a molded product and to efficiently obtain a product that reliably prevents the occurrence of secondary efflorescence over a long period of time.

(Means for Solving the Problems) This invention has a thermosetting resin coating on the adhesive surface to the surface of a centrifugally formed concrete column, and another resin coating formed on this coating. A colored and/or patterned product that has a colored and/or patterned surface on the new surface obtained by peeling off the coating, and further has a transparent or translucent resin coating layer as the outermost layer if necessary. It is a concrete column. In addition, when manufacturing concrete columns by centrifugal force forming, a peelable paint is applied to the adhesive surface with the formwork to form a peelable coating. forming a thermosetting resin film thereon, or forming at least one layer of a colored and/or patterned resin film thereon, and using this formwork to form a concrete column by centrifugal force forming; After the concrete has hardened, it is removed from the mold and the coating formed on the formwork is reversed onto the surface of the concrete column to cover the concrete column, and then the peelable coating is peeled off, and the new surface after this peeling is colored and/or This is a method for producing a colored and/or patterned concrete column, which is characterized in that it is patterned and, if necessary, a transparent or translucent resin paint is further applied thereon. This invention will be further explained below.

The inventors attempted various experiments to beautifully color and/or pattern a centrifugally formed concrete column. The inventor first proposed a method for simply and reliably coating the entire surface of a concrete column of any shape with a resin film, as disclosed in Japanese Patent Application No. 172954/1986 (Japanese Patent Application Publication No. Showa 62-
33607). As a result, the peelable coating proposed here is formed on the inner surface of the formwork, and the centrifugally formed concrete is removed from the mold after hardening, thereby inversely coating the surface of the concrete column with the peelable coating. It was confirmed once again that this method is the most suitable. The paint used here is
This is a strippable paint, generally called strippable paint, which forms a strippable film through a drying process after application. This peelable coating is
The adhesion to the coating substrate is extremely weak and can be easily removed. Therefore, by forming a strippable coating on the inside of the formwork with this strippable paint, centrifugally forming the concrete column with this paint, and removing it from the mold after hardening, it can be easily peeled off to the surface of the concrete column. A resin coating can be formed.

In this invention, this peelable coating is formed on a centrifugally molded surface by turning it over from the mold, and then this peelable coating is peeled off to reveal a new surface of a clean resin coating. It is something. That is, a peelable paint is applied to the formwork to form a peelable film, and then a thermosetting resin paint such as epoxy resin or polyester resin is applied on top of that to form a peelable film. A two-layer resin film of a thermosetting film is formed in advance. Using such a formwork, concrete is centrifugally formed and removed from the mold after hardening.
As a result, both the peelable coating and the thermosetting coating are reversely coated on the surface of the concrete molded body. After that, the peelable coating on the outer surface is peeled off. After peeling, the concrete column is covered only with a resin film made of thermosetting resin such as epoxy resin or polyester resin. Moreover,
The outer surface of the thermosetting resin coating can be a new surface immediately after the peelable coating is peeled off. The new surface of the thermosetting resin such as polyester resin obtained in this way is of course clean and free of dust and other deposits, and therefore can be printed or otherwise printed with patterns or designs without any pre-treatment. , coloring, etc. can be applied.

On the other hand, the thermosetting resins used here, such as polyester resin and epoxy resin, have excellent adhesion and barrier properties to concrete, and do not crack or blister even with aging. It is effective in reliably preventing rainwater from entering from the surface of concrete columns and preventing secondary efflorescence.

As described above, the coloring, patterns, designs, etc. that are formed on the new surface obtained by peeling off the peelable film formed on the surface of the concrete column are beautiful because the base is clean and in good condition. The adhesive strength with the substrate is also strong.

The concrete column having such a colored and/or patterned surface is then coated with a transparent or translucent resin coating on the pattern, etc., as required. The paint used here is preferably a weather-resistant fluororesin paint or acrylic resin paint. Fluorine resin or acrylic resin has excellent weather resistance, so designs can be kept beautiful for a long time.

That is, this invention coats the adhesive surface with the centrifugally formed concrete column with a thermosetting resin with strong adhesiveness such as epoxy resin, and then peels off a peelable coating on this to create a new surface. This is a concrete column body having a colored and/or patterned surface of a new configuration, in which a colored or patterned surface is formed on the surface.

The second invention of the present application is one of the manufacturing methods thereof, and as can be understood from what has already been explained, this involves first applying a peelable paint to the formwork to form a peelable coating thereon. do. As a peelable paint, for example, "Strip Paint" (trade name of Kansai Paint Co., Ltd.)
This is dissolved in a solvent. This is sprayed onto the inner surface of the formwork at a rate of 200 to 300 g/m ² using a spraying device or the like, and left to harden for about 1 hour to form a film. Subsequently, an epoxy resin paint is sprayed onto this at a rate of, for example, 700 to 800 g/m ² and is semi-cured to form a film thereon. In this state, put the cement mixture here,
Thereafter, centrifugal force molding is performed using a conventional method, followed by steam curing. After curing, the peelable coating is removed from the mold by a conventional method, and the peelable coating is peeled off from the formwork and coated onto the surface of the concrete column. Then, this reversed peelable coating is peeled off. The coating can be easily peeled off continuously by pulling it from a corner. When the coating is peeled off, a new surface of the thermoplastic resin coating is revealed, clean and free of dirt and deposits. Any design, color, etc. can be applied to this new surface by printing or other means without any pretreatment.
This patterning can be done using a weather-resistant resin paint with pigments added to it, and with this, concrete columns with designs and patterns are completed. Further, if necessary, a transparent or translucent, preferably weather-resistant resin paint is applied thereon.

The third invention, which is another manufacturing method of the present application, is a modification of the above manufacturing method, in which a peelable coating is formed on the inner surface of the formwork, and then colored and/or patterned. A resin film is formed, and a thermosetting resin film is further formed thereon. In this state, a cement mixture is poured into the concrete and centrifugally formed, and the concrete is removed from the mold after it has hardened. Then, simultaneously with the demolding, the surface of the concrete column is inverted coated with a peelable coating, a colored and/or patterned resin coating, and a thermoplastic resin coating. It will be colored and/or patterned.
Therefore, in this case, the product is completed by peeling off the outermost peelable coating after demolding, but in this case as well, transparent or semi-transparent coating may be applied on top of this as necessary, as in the above invention. Apply a transparent, preferably weather-resistant resin paint.

(Effects of the Invention) According to the present invention, coloring and/or patterning on a centrifugally formed concrete column is as follows:
This has resulted in a significant reduction in work efficiency compared to the conventional method. In other words, in the past, pretreatment for coloring and/or adding patterns required adjusting the moisture content of concrete columns, removing harmful substances such as rust and dirt, and roughening the surface by applying paper. However, according to this invention, such pretreatment of the substrate is no longer necessary.
It is believed that the productivity improvements and cost reductions that result from this are immeasurable.

Next, according to this invention, since colors, designs, and patterns are drawn on the new surface from which the peelable film has just been peeled off, there are no substances such as dust that may inhibit the adhesion between the two. It can be firmly bonded without any interference, and there is no longer any chance of the pattern or drawings peeling off even over time. In addition, since the outer surface of the concrete column is densely coated with a thermosetting resin film, rainwater does not enter or exit from the outside of the concrete column, and there is no risk of primary or secondary efflorescence. It's gone.

The present invention will be further explained below with reference to Examples.

Example 1 A formwork for a concrete pole with an end end of 14 cm, a base end of 24.5 cm, and a length of 8 m was cut in half.After wiping off the dirt on the formwork, strip paint (Kansai Paint) was applied as a removable paint. A mixture of 100 parts (trade name) and 60 parts of thinner was thoroughly stirred and sprayed at a rate of 200 g/m ² using an airless type spraying device. After spraying, the paint was left to dry at room temperature for 1 hour. After that, epoxy resin (Unitaku 5000-3, Onoda company product name) was added to this as the main material.
A well-stirred mixture of 100 parts of curing agent, 50 parts of hardening agent, and 3 parts of pigment (chromium oxide) was sprayed at a rate of 800 g/m ² .
Next, a reinforcing cage was inserted into this and the mold was assembled.
Concrete was injected into the mold using a regular molding line, followed by centrifugal force forming and steam curing, and the mold was demolded the next day. There was no adhesion to the formwork, and the mold was demolded very smoothly. The next day, peel off the peelable film on the surface and apply 100% acrylic resin paint (Top Coat, Onoda Co., Ltd. product name) to the exposed beautiful resin surface.
and 100 parts of thinner were sprayed twice at a rate of 100 g/m ² to prepare a product. This product was a colored pole that had sufficient adhesion to the underlying concrete and had no uneven color.

Example 2 Using the same formwork as in Example 1, after wiping off the dirt on the formwork in a half-cut state, thinner was added to 100 parts of the same strippable paint strip paint as in Example 1. A mixture of 60 parts was thoroughly stirred, sprayed at a rate of 200 g/m ² using an airless type spraying device, and dried for 1 hour. On top of this, epoxy resin (product name of Onoda Co., Ltd., Unitack-5000-
3) was sprayed at a rate of 800g/m ² to complete the processing of the formwork.

After that, a reinforcing cage was inserted into the mold and the mold was assembled, followed by pouring concrete, centrifugal force forming, and steam curing on a regular forming line. When this was removed from the mold the next day, it was removed smoothly without sticking to the mold. The day after demolding, the peelable coating on the surface was removed, and two types of acrylic resin paint, yellow and green, were applied to the exposed beautiful resin surface in a spotted pattern using an airless spray device. It was dried for 2 hours. Furthermore, from above, apply a transparent acrylic resin (trade name, Topcoat, manufactured by Onoda).
The product was sprayed twice at a rate of 100 g/m ² . The production of this item was efficient, especially when it came to the patterning work, as there were no spatial constraints.
Moreover, the obtained product was beautiful without any spot-like pattern exudation.

Claims (1)

[Claims] 1. A thermosetting resin coating is provided on the adhesive surface of the centrifugally formed concrete column, and is obtained by peeling off another resin coating formed on this coating. A colored and/or patterned concrete column, characterized in that the new surface has a colored and/or patterned surface, and further has a transparent or translucent resin coating layer as the outermost layer, if necessary. 2. When manufacturing concrete columns using centrifugal force forming, a peelable coating is applied to the adhesive surface with the formwork to form a peelable coating, and a thermosetting resin is applied on top of this coating. A coating is formed, a concrete column is formed using this formwork by centrifugal force forming, and after the concrete hardens, the mold is removed and the coating formed on the formwork is inverted onto the surface of the concrete column to form a concrete column. The peelable coating is then peeled off, the new surface after this peeling is colored and/or patterned, and if necessary, a transparent or translucent resin paint is further applied thereon. A method for manufacturing colored and/or patterned concrete columns. 3. When manufacturing a concrete column by centrifugal force forming, a peelable paint is applied to the adhesive surface with the formwork to form a peelable coating, and at least coloring and/or patterning is applied on the peelable coating. Then, a thermosetting resin coating is formed on top of this coating, a concrete column is formed by centrifugal force molding using this mold, and the concrete column is removed from the mold after it has hardened. The coating formed on the formwork is then inverted onto the surface of the concrete column to cover the concrete column, the peelable coating is then peeled off, and if necessary, a transparent or translucent resin is applied on top of the coating. A method for producing a colored and/or patterned concrete column, which comprises applying a paint.