JPH11348018A - Decorating method of fiber reinforced cement plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the controlling of the color of a cement plate by a method wherein the plate is manufactured by spraying a pigment on the surface of a cement slurry layer in a process, in which a cement slurry is laminarly supplied on a felt belt and then the slurry layer is suction-dehydrated so as to be made into the plate, being cut in predetermined lengths after the sprayed surface is agitated, being pressed and being curingly hardened. SOLUTION: A slurry A is supplied in a layer 3 having the thickness of 25-40 mm in an endless felt belt 2 equipped with a suction-dehydrating device 1. After that, a pigment-dispersed water B, which is prepared by adding 25 parts of a pigment to 100 parts of the water so as to uniformly disperse the pigment in the water, is uniformly sprayed on the surface of the supplied slurry in 150 g/m<2> . Just after that, the surface of the cement layer 3 is agitated about 5 mm deep with a spiked roll 4 so as to mix the pigment and the cement layer 3 in order to make into a plate through its conveyance under the state being suction-dehydrated. Next, the resultant plate 3 is cut in predetermined lengths with a cutter 5 and transferred to a pressing device 6 so as to be pressed by an uneven pattern with a pressing platen 6A and finally curingly hardened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of making a fiber reinforced cement board, and more particularly, to a method of making a fiber reinforced cement board having excellent decorativeness.

[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 coated with an opaque paint. And a method in which colored sand particles are sprayed and adhered immediately after coating, and finally a transparent coating is performed to finish. In addition, there is a method in which the base material itself is colored with a colored slurry and then a concavo-convex pattern is formed by pressing to finish 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.

[0005] When the colored slurry is sprayed,
Spraying may be performed by spraying, etc., but there is a problem that the inner surface of the spray nozzle is worn out by particles of cement or silica sand, the cement setting reaction proceeds, the viscosity changes, and the spraying amount gradually changes. There was a drawback that maintenance management of the system was troublesome.

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.

The present invention solves the above problems, facilitates color adjustment and eliminates the problem of delamination of the surface decorative layer, and at the same time, changes in appearance even when cracks or chips that do not cause any functional problems on the surface occur. The purpose of the present invention is to provide a method for making a fiber reinforced cement board in which little is seen.

[0008]

According to the present invention, there is provided a method for 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 form a plate. After the pigment is sprayed, the surface of the spray is agitated, cut into predetermined lengths, pressed, and then cured and cured.

According to the present invention, when coloring a fiber-reinforced cement board, instead of spraying a colored slurry obtained by adding a pigment to the slurry, the pigment is directly sprayed on the laminated cement layer and the surface thereof is stirred. Color adjustment can be easily performed.

Further, since the dispersed pigment is mixed into the cement layer of the base layer at the time of stirring the surface, the pigment is colored up to the inside of the base layer so that even if the surface is cracked or chipped, it is not noticeable. Further, by changing the amount of the pigment to be applied and changing the mixing ratio of the base layer to the cement layer or changing the degree of surface agitation, it becomes possible to obtain a marbled or blurred pattern and also to obtain a change in the pattern.

[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, a slurry A is supplied in 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 is added at a ratio of 25 parts of pigment to 100 parts of water. 150 g / m ^{2 of the} uniformly dispersed pigment dispersion water B
, And immediately thereafter, the mixture was stirred with a spike roll 4 to a depth of about 5 mm on the surface of the cement layer 3 to mix the pigment and the cement layer 3. Thereafter, the substrate was conveyed while being dehydrated by suction and made into 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 after dispersion of the pigment-dispersed water of Examples 1 and 2, water was sprayed during dehydration and conveyance after stirring. Comparative Example 1 The same conditions as in Example 1 were adopted, except that the pigment-dispersed water spray in Example 1 was replaced with a colored cement slurry to which a pigment of the same color was added, and the plate was made without stirring with a spike roll. To obtain a fiber reinforced cement board.

The appearance of the surface of each of the above Examples 1 to 3 and Comparative Example 1 was compared after the product was made into a product. However, in the comparative example, the surface was flat and had 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 layers in Examples 1 and 2, and the layers were gradated. And the layer surface was 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 Spraying apparatus of pigment dispersion water 5 Cutter 6 Press board

Claims (1)

[Claims] In the process of supplying a cement slurry in layers on a felt belt equipped with a suction dewatering device, suction dehydrating and making a plate, a pigment is sprayed on the layer surface, and after stirring the spraying surface, the pigment is sprayed every predetermined length. Method for making fiber-reinforced cement boards that cure and harden after being cut into pieces and pressed.