JPH0419186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention relates to a construction board with a stucco-like decorative finish.

[Background technology]

It is generally preferred that the exterior walls of buildings be finished in a stucco style. Traditionally, stucco finishing was done on-site. In other words, the process of applying mortar, applying lysine, and troweling was carried out on site. This method not only has the disadvantage of requiring specialized personnel, but also has the disadvantage that the construction period is difficult to meet and shorten. Furthermore, it has the disadvantage that it requires 3 to 4 kg/m ² of paint and is labor-intensive, and it also has the disadvantage that it cannot be finished in a uniform pattern.

[Purpose of the invention]

This invention aims to eliminate these drawbacks.

[Disclosure of the invention]

BACKGROUND ART Factory-produced cement construction boards are often used as wall materials for buildings. Therefore, the inventors considered achieving the above object by giving the architectural board a stucco-like surface finish. It was also found that a variety of combinations of conditions are required to achieve a natural-looking stucco finish on an industrial scale. This invention was completed through this process.

This invention is characterized by applying stucco-like embossing to the surface of an uncured cement substrate, curing it, applying an undercoat to the surface of the obtained cured product, pressing it from above, and then applying a topcoat. The gist is the manufacturing method for architectural boards. This will be described in detail below based on drawings showing examples thereof.

First, an uncured cement substrate is prepared. This follows methods known in the manufacture of cement building boards. For example, cements such as Portland cement, blast furnace cement, granulated blast furnace slag, and gypsum are mixed with aggregates, reinforcing materials, and other additives to form a slurry, which is then made into a sheet (green sheet). An uncured cement substrate is obtained by stacking the cement substrates, if necessary, and cutting them into predetermined dimensions. The thickness of the cement substrate is set appropriately, and is, for example, 8 to 15 mm.

A stucco-like embossing process is applied to the surface of the thus obtained uncured cement substrate using a press. FIG. 1 shows a cement substrate 1 having a stucco-like uneven surface obtained in this manner. In the figure, 2 is a convex portion and 3 is a concave portion. As shown in FIG. 2, it is preferable that the inclination angle of the slope of the convex portion 2, that is, the embossed edges α, α' is 25° or less.
Further, the higher the height H of the convex portion 2 from the surface of the concave portion 3, the better. For example, when the substrate thickness is 8 to 15 mm, the height H is preferably about 1.0 to 3.0 mm. If the embossing conditions are set in this way, the stucco-like pattern will be noticeable and sharp. Furthermore, the eaves at the upper end of the convex portion, which will be described later, can be easily and clearly formed. Embossing may be continuously applied to the continuously obtained substrate material using an embossing roll, and there is no particular restriction on the timing. There are no restrictions on the type of uneven pattern, and there are no restrictions on the processing method.

The embossed cement substrate is cured and hardened. The curing method may be a commonly used method.

An undercoat is applied to the surface of the obtained cured product. There are no special restrictions on the undercoating material, but for example, 200 to 100 parts by weight of aggregate such as kansui stone or silica sand to 200 parts by weight of paint such as acrylic emulsion paint or urethane paint.
A mixture of 400 parts by weight is used.
The coating amount is appropriately selected within a range that does not impair the clarity of the embossed pattern. For example, it is 500 to 700 g/ ^m2 . It is best to keep the viscosity high. This is because problems such as sagging do not occur. FIG. 3 shows how the undercoat layer 4 is formed on the surface of the cured product. In the figure, 2 is a convex part with a stucco-like embossed pattern,
3 is a recess. The undercoating is done by spraying or the like.

Next, pressure is applied from above the undercoat. This is done, for example, by rolling. At this time,
It is a good idea to apply mold release oil to the roll. This is because peeling of the undercoat is prevented. This pressure causes
As shown in FIG. 4, the undercoat layer 4 on the upper surface of the embossed convex portion 2 is slightly crushed, and a protrusion 5 is formed at the upper end of the convex portion. Since this eave 5 has a reverse taper, it is shaded and increases the depth and natural feel of the stucco pattern. Although the upper surface of the convex portion 2 becomes smooth due to the above-mentioned pressing, a rough surface formed by the aggregate remains on the surface of the concave portion. This is a state suitable for creating a natural feel.

After that, a top coat is applied. The top coat material may be the same as the base coat material or may be different. Sometimes only acrylic emulsion or urethane paints are used. Care must be taken not to erase the stucco pattern obtained by the roll presser. Topcoating is also done by spraying.

After finishing in this manner, a drying process is added if desired, and further processing necessary for use as a construction board is performed.

〔Effect of the invention〕

The method for producing architectural boards according to the present invention involves applying stucco-like embossing to the surface of an uncured cement substrate, curing it, applying an undercoat to the surface of the obtained cured product, pressing it from above, and then applying a topcoat. Because it is characterized by the fact that it does not require professionals, it is possible to shorten the construction period and ensure compliance. Since stucco finishing does not require on-site construction, a completely dry construction method can be achieved on-site. Since the ricin finish does not require manual processing, the amount of paint used can be reduced to about half. The pattern is rich in shadows and sharp, yet natural.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the embossed cement substrate, Figure 2 is an explanatory diagram explaining the embossing conditions, Figure 3 is a sectional view of the main part showing the undercoat surface, and Figure 4 is the pressing process. FIG. 2 is a cross-sectional view of a main part showing the surface of an undercoat coated with the undercoat. DESCRIPTION OF SYMBOLS 1...Cement substrate, 2...Convex part, 3...Concave part, 4...Undercoat layer, 5...Eave.

Claims (1)

[Scope of Claims] 1. After applying stucco-like embossing to the surface of an uncured cement substrate, it is cured, and the surface of the obtained cured product is coated with an undercoat and pressed from above, and then a topcoat is applied. Characteristic manufacturing method for architectural boards. 2. The method for producing a construction board according to claim 1, wherein the embossing is performed so that the emboss edge is 25° or less. 3. The method for manufacturing a construction board according to claim 1 or 2, wherein the pressing after undercoating is performed by rolling.