JPH0543356A - Treatment of alc panel with latex - Google Patents

Abstract

(57) [Summary] [Constitution] Normal AL with a resin solid content of 40% by weight.
The acrylic resin latex used for coating the C panel was diluted with an equal amount of water to a resin solid content of 20% by weight, and evenly applied to one side of the ALC panel using a spray gun. The panel was turned inside out and applied to the other side. Immediately after applying the resin, it was stacked on the panel applied immediately before. [Effect] Since the applied latex does not adhere to other panels, it is possible to significantly reduce the powder falling from the surface of the treated ALC panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a latex treatment to the surface of an ALC panel before construction, and more particularly to a method of reducing powder falling from the surface of the ALC panel by latex treatment.

[0002]

2. Description of the Related Art In a manufacturing process, an ALC panel is divided into a large number of panels by cutting a large block of semi-plastic material with a piano wire. However, compared to a panel cut while vibrating the piano wire during this cutting, a panel cut without vibrating the piano wire has a wavy edge in the cut surface of the panel, that is, in the direction of the cut piano wire on the panel surface. Appearing, the fluff collapses during handling such as transportation and becomes powder and adheres to the ALC panel surface. When such an ALC panel with powder adhered to it is used as it is for a roof or floor without providing a suspended ceiling on the bottom surface, the powder adhering to the panel surface, especially the panel bottom surface, may be transferred to the lower floor due to building vibration and the like. Since it falls, it is necessary to reduce the powder drop especially when the ALC panel is used in a precision equipment manufacturing factory, a coating factory, a food factory or the like.

Therefore, in the past, means for applying paint to the panel surface has been used in ALC manufacturing plants. in this case,
Usually, a large amount of paint, for example, about 1 kg / m ² of dry weight is applied so that the fluff on the surface of the panel is not visible. Therefore, the ALC panels are stacked after a drying process after the application. Therefore, in the conventional method, a dedicated drying machine is used or a drying place with a roof is required to perform natural drying for a long time.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for treating an ALC panel having a fluffy surface, which does not require a special drying step as in the conventional method.

[0005]

The processing method of the present invention is
Resin solid content of 10 to 50 on at least one side of the LC panel
AL characterized by coating g / m ² latex
This is a method for processing the C panel's latex. Among the ALC panels used in the treatment method of the present invention, a particularly preferred panel is a panel that is cut without vibrating a piano wire at the time of manufacture, and has a wavy shape in the cut surface of the panel, that is, in the direction of the piano wire that is cut on the panel surface. It is a panel with a fluffy appearance. In this ALC panel, the amount of cement powder until the surface of the panel is flattened by sprinkling the cement powder on the panel surface and filling the dents between the fluff, and can be used as an index showing the height of the fluff on the panel surface. it can. The amount of cement powder in the ALC panel cut without vibrating the piano wire during production is usually 150 ml or more per 1 m ^{2 of the} surface of the ALC panel, and in many cases exceeds 200 ml. An ALC panel having a large amount of powder falling from the surface showing such a value is a preferable target panel of the present invention. For these ALC panels with a cement powder amount of 150 ml / m ² or more, 25 g / m ² or more, and in many cases 50 g / m ² when the two panels are stacked and rubbed 5 times in front, back, left and right, and the amount of powder drop is measured.
More than ² powder drops.

Further, the panel surface to be treated is at least one side, and by treating one side, even if the ALC panel is directly exposed by using the treated side as the lower side and used for the floor or roof surface, the panel is treated. The powder falling from the surface can be extremely reduced. However, if both sides are processed, even if the panel surfaces rub against each other when taking out one panel from the state where the panels are stacked, powder will not easily fall off from the other panel surfaces, and powder on the panel surface will not It is particularly preferable because it can significantly reduce the adherence.

The resin used in the treatment of the present invention is a water-dispersed resin, that is, latex, and preferred latexes are styrene-butadiene latex, acrylic resin-based latex, acrylic-styrene copolymer latex and the like. Yes, these latexes usually have resin solids of 4
It is marketed as 0 weight percent latex, but these are diluted with an equal amount or more of water to give a resin solid content of 10-2.
It is preferable to use it as about 0% because it can be uniformly applied with a small amount of use.

In the present invention, the amount of the latex applied to the entire surface of one side of the ALC panel is 10 to 50 g in terms of resin solid content per 1 m ² of the panel surface. No reduction effect was observed, 50g
This is because, if the number exceeds the above range, when the panels are stacked without performing a drying step after coating, a phenomenon in which the resin adheres to another panel due to the weight of the stacked panels and a drying step after coating is required. As in the present invention, with a specific coating amount, the water content in the latex is absorbed in the ALC panel,
The applied resin component is quickly dried on the application surface, and the resin does not adhere between the panels even when stacked immediately after application. The present invention has been completed by finding that powder falling can be extremely reduced by uniformly applying a small amount of resin in this manner.

The latex may be applied by spray coating with a spray gun or by a roller such as a sponge roller, but spray coating with a spray gun is particularly preferred because a small amount of resin can be applied uniformly. When the latex treatment of this ALC panel is performed after the construction of the panel, the panel must be applied upward from the bottom surface, the amount of resin adhered becomes uneven, and the stacking step after painting is unnecessary. Since the characteristics of the present invention cannot be fully exerted, it is necessary to apply before the construction, which can be applied in a horizontal state with the panel facing upward. If it is before the panel construction, it can be piled up immediately because it does not require a drying process after application, and it does not require a large space for drying, so even if it is applied at the ALC panel manufacturing factory, it is applied before the application at the construction site. You may.

[0010]

EXAMPLES The processing method of the present invention will be specifically described below with reference to examples.

[0011]

Example 1 and Comparative Example 1 An acrylic resin latex used for coating a usual ALC panel having a resin solid content of 40% by weight was diluted with an equal amount of water so that the resin solid content was 20% by weight. I adjusted it. This is air pressure 2kg / cm
Using the spray gun of ^No.2 , the piano wire was cut without vibration during manufacturing and the surface was wavy and horizontally placed 60 cm wide, 180 cm long, 10 cm thick ALC panel (filling the dents between the fluff). The amount of cement powder required to flatten the surface is about 350 ml per 1 m ^{2 of} ALC panel surface.)
The coating amount was changed to 5, 10, 20, 30, 40, 50, 60 g / cm ² . In the panel of the present invention shown in Table 1, the fluffy pattern was visible even after application. Immediately after applying the resin, the panels were stacked with the treated surface facing upward on the panel applied immediately before. In this way, the amount of resin applied is 1
Four ALC panels were processed for each condition.

After the lapse of 12 hours at 20 ° C., the amount of powder falling was measured for each of the above three panels under the following conditions, and the average value of the three was determined. The amount of powder falling is measured on the shaking table with a width of 3 cm, a height of 2 cm, and a length of 60 cm.
Place the wooden roots of the above at both ends, and put the ALC panel on it.
The processed surface was placed face down, vibration of 200 Hz and maximum amplitude of 1.5 mm was applied for 5 minutes, and the amount of powder that fell was measured and converted into an amount per 1 m ^{2 of} panel surface.

After the treatment, the presence or absence of adhesion between the panels is checked by treating as described above, and immediately after stacking four sheets, the entire surface of the uppermost panel is subjected to a pressure of 0.2 kg / cm ² (30 sheets of panels). After pressing for 12 hours at 20 ° C. with a pressure equivalent to stacking), the presence or absence of adhesion between the panels was examined. The above results are shown in Table 1.

[0014]

Example 2 Normal A having a resin solid content of 40% by weight
The acrylic resin latex used for coating the LC panel was diluted with an equal amount of water to adjust the resin solid content to 20% by weight. Using a spray gun with an air pressure of 2 kg / cm ² , this was cut without vibrating the piano wire at the time of manufacture, and the surface was wavy and horizontally placed 60 cm wide, 1 cm long.
Evenly applied to one side of an 80 cm, 10 cm thick ALC panel (the amount of cement powder required to fill the dents between the fluff and make the surface flat is about 380 ml per 1 m ^{2 of} ALC panel surface). Then, the panel was turned inside out and applied to the other side. Table 2 shows the applied resin solid content.

In the panel of the example of the present invention shown in Table 2, the fluffy pattern was visible even after application. Immediately after applying the resin, it was stacked on the panel applied immediately before. In this way, four ALC panels were processed under each condition where the amount of resin applied was one. After 12 hours at 20 ° C., the amount of powder falling was measured under the following conditions for the above two panels under each condition. The amount of powder falling was measured by stacking two panels and rubbing the panels back and forth and left and right five times, measuring the amount of powder separated from the panels, and converting the amount per 1 m ^{2 of} panel surface.

The presence or absence of adhesion between the panels after the treatment is confirmed by treating as described above and immediately after stacking four sheets, the entire surface of the uppermost panel is pressed with a pressure of 0.2 kg / cm ² (30 sheets of panels). After pressing for 12 hours at 20 ° C. with a pressure equivalent to stacking), the presence or absence of adhesion between the panels was examined. The above results are shown in Table 2.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

According to the present invention, a piano wire is cut without vibrating, and wavy fluff appears on the surface in the direction of the cut piano wire, and the fluff collapses into powder when handling during transportation. The ALC panels that had adhered to the surface due to the latex are stacked immediately after the application without the drying process after applying the latex, so that the coated latex does not adhere to other panels, and the powder drops from the treated panel surface. Can be significantly reduced. Therefore, unlike the conventional method, it is not necessary to use a dedicated dryer, and it is not necessary to use a wide drying field with a roof for natural drying for a long time, which is an excellent effect.

Claims (1)

[Claims] 1. A method for latex treatment of an ALC panel, characterized in that at least one surface of the ALC panel is coated with a latex having a resin solid content of 10 to 50 g / m ² .