JPH11348022A - Cosmetic method of fiber reinforced cement board - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To apply makeup to a fiber reinforced cement board,
It is an object of the present invention to make it easy to adjust the color for coloring and make a marble-like makeup, and at the same time, to apply makeup that has almost no change in appearance even if cracks and chips that do not cause any functional problems occur on the surface. SOLUTION: In the process of supplying cement slurry A in the form of a layer 3 onto a felt belt 2 provided with a suction dehydrating device 1, and performing suction dehydration to make a plate, the surface of the layer 3 is agitated and roughened. Pigment B is sprayed, cut at predetermined lengths, pressed, and then cured and cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making a fiber reinforced cement board, and more particularly to a method for making a fiber reinforced cement board realizing marble-like decoration.

[0002]

2. Description of the Related Art In the past, inorganic plate materials have been very widely used as building materials such as wall plates and roofing materials. These inorganic plate materials are gray-white to gray-black, achromatic and indecorative if they are intact, so that it is widely practiced to apply a concavo-convex pattern to the surface by pressing and further apply various coatings to impart design properties. .

Conventionally, as a decorative means, conventionally, an uncured fiber-reinforced cement board is provided with a concavo-convex pattern by pressing, and after curing and curing, is further coated with a concealing paint. And a method of spraying colored sand particles or the like immediately after painting and finally finishing by transparent painting. A method has also been proposed in which the base material itself is colored with a colored slurry, and then a concavo-convex pattern is applied to finish the substrate with a transparent coating.

[0004]

However, when adjusting the colored slurry in the above cosmetic method, it is difficult to adjust the coloring to a constant color because the raw materials such as cement have different color densities for each manufacturer and lot. There was a problem that it required.

In addition, the above-mentioned makeup method has a problem that only a single color can be colored at a time, and it is difficult to express a marble-like decorative pattern in which two or more colors are mixed in a complicated manner, and only a monotonous decoration can be obtained. Was.

Further, in the above-mentioned conventional makeup method, since only the surface layer is used, there is no functional problem as a plate material. If cracks or chips are present on the surface, the base color is exposed and the color difference from the surface makeup color becomes clear. There was also a problem that the surface appeared and the appearance was significantly impaired.

[0007] The present invention solves the above-mentioned problems, and enables decoration of a complex color such as marble tone easily, and
It is an object of the present invention to provide a cosmetic method of a fiber reinforced cement board in which the appearance is hardly changed even if cracks and chips having no functional problem occur on the surface.

[0008]

According to the present invention, there is provided a method of making a fiber reinforced cement board, wherein a cement slurry is supplied in a layer form on a felt belt provided with a suction and dehydration apparatus, and the slurry is dehydrated to produce a plate. Is agitated to roughen, a pigment is sprayed on the roughened surface, cut at predetermined lengths, pressed, and then cured and cured.

According to the present invention, when coloring the fiber-reinforced cement board, the surface of the layered cement layer is roughened, and the pigment is sprayed directly on the surface. Color adjustment can be performed easily.

Further, since the dispersed pigment is pressed at the time of pressing and pressed into the inside of the cement layer of the base layer, the inside of the base layer is colored and even if the surface is cracked or chipped, it is not noticeable.

[0011]

Next, an embodiment of the present invention will be described. Example 1 As a cement composition of a fiber-reinforced cement board, a cement composition of 40% by weight of cement, 40% by weight of silica sand, 10% by weight of pearlite, and 10% by weight of pulp fiber having a fiber length of 2 to 4mm as pulp fiber is prepared. Then, these compounding materials were put into a mixing tank together with water, and were uniformly mixed.
A 5% cement slurry A was prepared.

As shown in FIG. 1, the slurry A was supplied into a layer 3 having a thickness of 25 to 40 mm on an endless felt belt 2 provided with a suction dewatering device 1 and transported while suction dewatering to make a plate. During the plate making, when the water contained in the surface is dehydrated and the fluidity of the surface layer is lost, the surface of the cement layer 3 is agitated to a depth of about 15 mm with the spike roll 4 to roughen the surface.
Pigment-dispersed water B, which was added at a ratio of 25 parts of pigment to 100 and uniformly dispersed, was uniformly sprayed at 150 g / m ² , and then conveyed while being suction-dehydrated to make a plate.

Next, the formed plate 3 is cut into a predetermined length by a cutter 5 and transferred to a press device 6, where a brick joint having a size of 10 cm × 5 cm has a depth d = 5 mm as shown in FIG. Pressing the uneven pattern of θ = 60 ° with the press machine 6A
It was compression-pressed at 15 MPa for 30 seconds.

After pressing, the molded plate material 3 was naturally cured for 24 hours, and thereafter, autoclaved at 170 ° C. for 15 hours. After shaping and cutting the molded article 3 to finish it into the contour shape of the final product, the surface was subjected to transparent clear coating of an acrylic emulsion and dried to produce a decorative fiber reinforced cement board. Example 2 The same compounding of the fiber-reinforced cement board as in Example 1
Further, 3 parts by weight of a fatty acid ester (trade name: Pertol R-710, manufactured by Hyundai Chemical Co., Ltd.) is added as a water repellent to 100 parts by weight of the solid content of the compounding material and stirred to prepare a cement slurry A having a slurry concentration of 25%. did.

A fiber-reinforced cement board was manufactured in the same manner as in Example 1 except that the slurry A was used. Next, after shaping and cutting the molded article 3 to finish the contour of the final product, the surface is subjected to a silane coupling treatment with an alkylsilane-based waterproofing agent (trade name: Tossbarrier Toshiba Silicone Co., Ltd.). Transparent clear coating was performed and dried to produce a decorative fiber reinforced cement board. Example 3 A plate was produced in the same manner as in Examples 1 and 2, except that water was sprayed after the pigment was sprayed in Examples 1 and 2. Comparative Example 1 A cement layer 3 was formed with the same slurry A as in Example 1, and a colored cement slurry to which a pigment of the same color as in Example 1 was added was supplied onto the cement layer 3 without roughening the surface with a spike roll. A fiber reinforced cement board was obtained under the same conditions as in Example 1 except for the above.

When the appearances of the surfaces of the above Examples 1-3 and Comparative Example 1 were compared with each other after making the product, the Example had a marble-like pattern in which the cement material and the dispersed pigment were intricately mixed. It became the appearance of natural stone style,
The comparative example had a flat surface and a monotonous appearance.

When the sections were cut and observed, the pigment-colored layers were formed from the surface layer to the inside of the layer having a roughened depth in Examples 1 and 2, whereas the layers were gradation. In Comparative Examples, the surface coating and the layer surface were clearly defined.

Next, when the surface was scratched with a needle, in the case of the example, the same color pigment penetrated into the surface and the inner layer, so that the damage was not so noticeable.
In case (1), the scratches were very conspicuous due to the difference in color between the surface coating and the inner layer, and even a slight scratch deteriorated the design.

In Examples 1 and 2, the color was adjusted only by adjusting the amount of pigment dispersion and the amount of spraying. However, the comparative example was considerably affected by the relationship between the addition of pigment and the amount of cement in adjusting the colored slurry. It took time to adjust.

Further, in Example 2, wetting holes were formed at four corners, shower watering was performed uniformly over the entire surface of the test plate vertically supported by nailing for 10 minutes, and then the process of naturally drying for 50 minutes was one cycle. The test was continued for 10 hours, and the change in the surface pattern was observed.

As a result, the appearance of the surface of the fiber reinforced cement board of Example 2 did not change at all even after 10 hours.

[0022]

As described above, according to the present invention, when coloring a fiber-reinforced cement board, the pigment is sprayed directly on the cement layer surface and mixed with the cement layer by stirring to be colored. There is no need to add a pigment to the coloring slurry to add color tones, and color adjustment is facilitated.

Further, since coloring is carried out into the cement layer, even if the surface is scratched, it is less noticeable, and has an effect that a good appearance can be maintained for a long period of time.

[Brief description of the drawings]

FIG. 1 is a side view of an apparatus for performing a method according to the first aspect of the present invention.

FIG. 2 is an enlarged sectional view of a main part of a concavo-convex pattern type of a press machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suction dehydration apparatus 2 Endless felt belt 3 Cement layer 4 Spike roll 5 Cutter 6 Press board

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B28B 11/14 B28B 11/14 C04B 28/02 C04B 28/02

Claims (1)

[Claims] In the process of supplying cement slurry in layers on a felt belt equipped with a suction dewatering device, suction dehydration and plate making, the surface of the layer is agitated and roughened, and pigment is sprayed on the roughened surface. A method of making a fiber reinforced cement board which is cut at predetermined lengths, pressed, cured and then cured.