JPH10604A - Manufacturing method of cement board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To check blocking by a method in which the surface of a colored cement layer is dried and cured. SOLUTION: A molded cement backing 3 is delivered directly to a second transportation apparatus 50. An adjusting apparatus 60 for adjusting a hydraulic colored cement slurry 4 containing cement, pigment, and water, a cement slurry supplying apparatus 20 for a backing, and a similar colored cement slurry supplying apparatus 70 are installed on the apparatus 50. The slurry 4 is supplied, and a colored cement layer 5 is formed on the cement backing 3 to be able to be formed into a strip body 6. A drier 80 which forcibly dries the surface of the layer 5 of the transported body 6 is installed on the apparatus 50. The body 6 which passed through the drier 80 is transferred to a cutter 90 to be cut into plate-shaped bodies 7, and the pile 8 of the bodies 7 is transported into a curing chamber to be heated 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 producing a cement board which is provided with a colored cement layer made of a cement containing a cement, a pigment and water on a cement base mainly composed of cement and cured and hardened.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a cement board as described above, a cement slurry mainly composed of cement is laminated and dehydrated to produce a cement base mainly composed of cement. By laminating a dry powder of a colored cement containing a pigment on the cement base material and press-forming the cement base material, the dry powder is adhered to and integrated with the cement base material in a layered manner. However,
Since the colored cement layer formed in a layered manner in this manner is cured by using the excess moisture of the cement base material in the curing reaction, there is a fact that it is not possible to expect supply of too much water, As a colored cement layer that can be hardened with a small amount of water, it can be relatively thin,
Also, a cement base that cures in a relatively high moisture state and a colored cement layer that cures in a relatively low moisture state are different from each other due to differences in the progress of the curing reaction. Even though it is press-formed,
Poor adhesion to each other, easy to peel off from the cement substrate, or after curing and curing, it becomes easy to allow water intrusion from between the layers and easily becomes a structure that easily causes peeling due to frost damage, There was a fact that it was difficult to firmly integrate the colored cement layer with the cement base. Therefore, for the cement substrate, cement, pigments, to supply a colored cement containing water to form a colored cement layer, and to be able to form a relatively thick colored cement layer on the cement substrate, Attempts have been made to allow the colored cement layer to be firmly integrated with the cement substrate by making the conditions for curing the colored cement layer closer to the conditions for curing the cement substrate.

[0003]

However, according to the above-mentioned method for producing a cement board, the colored cement layer can be firmly integrated with the cement base material, but the cement board obtained by integral press molding is cured. At the time of curing, if adjacent cement plates are in contact with each other, the colored cement layer and the cement base material are also likely to adhere to each other at the contact surface (hereinafter, such an action is referred to as blocking), and the cement plates are connected to each other. Curing cannot be performed in a laminated state, and a large amount of space is required to prevent adjacent cement plates from contacting each other during curing, and a large amount of labor is required for workers. There was a disadvantage.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent blocking when curing and curing.
Another object of the present invention is to provide a method for manufacturing a cement board having a colored cement layer having a sufficient thickness.

[0005]

The present invention focuses on the fact that the above-mentioned blocking is in an environment where there is sufficient moisture at the contact surface between the cement base material and the colored cement layer, and the two are integrally cured. [Structure 1] The characteristic structure of the method for manufacturing a cement board of the present invention for achieving the above object includes a cement base mainly containing cement, a pigment, and water. In the case where a colored cement layer made of a colored cement is provided and cured and cured, it is an object to obtain a cement board by drying and curing the surface of the colored cement layer. [Function and effect] In other words, since the colored cement layer made of colored cement containing cement, pigment and water is provided, the colored cement layer can be formed to be relatively thick. Since the surface of the colored cement layer is cured after being dried, the dried colored cement layer, when cured and cured, the outer surface of the adjacent cement base material, and the outer surface of the colored cement layer. During this time, the curing reaction proceeds in a state where little water is present. For this reason, the colored cement layer and the cement base material are unlikely to be hardened integrally, and even if cured and cured in a laminated state, blocking hardly occurs. The outer surface of the colored cement layer is cured in a dry state, but can be sufficiently cured and cured since it is supplied with excess moisture on the cement substrate side.

[Structure 2] A feature of a method of manufacturing a cement board according to the present invention for achieving the above object is that a cement base mainly composed of cement is made of a colored cement containing a cement, a pigment and water. In the case where a cement layer is provided and cured and cured, a dried resin film covering the colored cement layer may be formed and then cured and cured to obtain a cement board. [Effects] That is, as described above, since the colored cement layer made of the colored cement containing cement, pigment and water is provided, the colored cement layer can be formed to be relatively thick. Since the cured cement plate is cured and cured by forming a dry resin film on the surface of the colored cement layer,
The dry resin coating covers the colored cement layer and prevents other objects from directly contacting the colored cement layer. As a result, the resin coating is usually formed to be hydrophobic, so that even if the cement substrate containing a large amount of water may come into contact with the dry resin coating, the colored cement layer may be used as the dry resin coating. A situation such as hardening integrally with the cement base is unlikely to occur,
Even if the cement boards are cured and hardened in a laminated state, blocking hardly occurs. At this time,
Since the dried resin film also has a function of shielding the colored cement layer from the outside air at the same time, it prevents discoloration of the colored cement layer at the time of curing and curing, promotes a curing reaction, and prevents rainwater penetration when used as a cement board. It fulfills functions such as prevention of effluent and is convenient for manufacturing a high value-added cement board.

[Effect] Therefore, curing can be performed in a state in which cement plates are stacked, and curing can be performed in a state where adjacent cement plates are in contact with each other during curing, and curing is performed in a space-saving manner. In addition, since adjacent cement plates may come into contact with each other, curing can be performed with simple work, the labor required for workers can be reduced, working conditions are reduced, and work efficiency is reduced. It can be used for improvement.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a manufacturing apparatus for manufacturing a roofing material made of cement, and an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, an apparatus for manufacturing a roofing material made of cement comprises an adjusting apparatus 1 for adjusting a hydraulic cement slurry 1 containing cement, aggregate, reinforcing fibers and water.
0, receiving a supply of the base material cement slurry 1 and receiving and storing the base material cement slurry 1; and a supply port 22 for flowing out the cement raw material 1 in the storage portion 21. A cement slurry supply device 20 for base material, comprising a gate 23 for regulating the opening thickness of the supply port 22; a permeable conveyor belt 31; and a base material flowing out from the supply port 22. A dewatering device 32 for dewatering the material cement slurry 1 is provided, and a first transport device 30 for forming the base material cement slurry 1 into the strip 2 is provided, and the conveyor belt 31 is provided.
A pressure forming device 40 for pressure-forming the upper band 2 is provided,
The cement base material 3 is configured to be formed into a strip shape. The molded cement base material 3 is transferred to the second transfer device 50 as it is. An adjusting device 60 for adjusting the hydraulic colored cement slurry 4 containing cement, pigment, and water, and a colored cement slurry configured in the same manner as the base material cement slurry supply device 20 described above are provided on the second transport device 50. A supply device 70 is provided to supply a hydraulic colored cement slurry 4 to form a colored cement layer 5 on the cement base material 3, and to be formed on a strip 6. Further, on the second transporting device 50, a drying device 80 for forcibly drying the surface of the colored cement layer 5 of the strip 6 to be transported is provided. The band plate body 6 that has passed through the drying device 80 is conveyed to a cutting device 90, cut into a predetermined shape and formed into a plate-like body 7, and then stacked and piled to be conveyed to a curing room. The composition is cured by heating.

[0010] The drying device 80 is provided with a
In a drying booth 81 covering the
Is provided, and the surface of the colored cement layer 5 of the conveyed strip 6 can be forcibly dried from above.

Further, the plate-like body 7 has a pressure of 10 to 30 MPa.
Under high pressure, autoclave curing at 150 to 180 ° C. for 8 to 20 hours, waterproofing, coloring and other coatings to form a cement board.

As the cement slurry for the base material, for example, 100 parts by weight of Portland cement added with 100 parts by weight of silica sand, 5 parts by weight of pulp, and 200 parts by weight of water. A material obtained by adding 5 parts by weight of a pigment and 50 parts by weight of water to 100 parts by weight of Portland cement is used. However, the present invention is not limited to the above-described composition, and can be applied to a case where a cement plate is formed from various cement compositions.

[Other Embodiment] Another embodiment will be described below. The second transfer device 50 and subsequent portions may be configured as follows. As shown in FIG. 2, an adjusting device 60 for adjusting a hydraulic coloring cement slurry 4 containing cement, aggregate, pigment, and water and a cement slurry supplying device for a base material are provided on the second transport device 50. A colored cement slurry supply device 70, which is configured in the same manner as 20., is provided so that the hydraulic cement slurry 4 is supplied to form the colored cement layer 5 on the cement base material 3 and can be formed on the strip 6. I have. A resin film forming device 100 for forming a resin film on the surface of the colored cement layer 5 of the belt 6 to be conveyed is provided on the second conveying device 50. The strip plate body 6 that has passed through the resin film forming device 100 is conveyed to a cutting device 90, cut into a predetermined shape, formed into a plate-like body 7, and then stacked into a pile 8 to a curing room. It is conveyed and cured by heating and curing.

The resin film forming apparatus 100 forms a dry resin film 9 by drying a resin supply apparatus 101 for supplying an acrylic resin emulsion to the surface of the colored cement layer 5 of the strip plate 6 and the supplied resin emulsion. And a drying resin film 9 of an acrylic resin can be formed on the surface of the colored cement layer 5.

[0015]

EXAMPLE The plate 7 was cured according to the previous example.
No blocking was seen. In addition, the molded cement plate was completely submerged in freezing and thawing test (ASTM C-666).
(According to the test method A), no defects such as peeling were observed between the cement substrate and the colored cement layer even after 300 cycles.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a schematic view of a method for producing a cement board of the present invention.

FIG. 2 is a schematic view of a method for manufacturing a cement board of the present invention in another embodiment.

[Explanation of symbols]

 3 Cement base material 4 Colored cement 5 Colored cement layer

Claims (2)

[Claims] 1. A colored cement (4) containing cement, a pigment and water on a cement base (3) mainly composed of cement.
A method for producing a cement board, comprising: providing a colored cement layer (5) made of the above and curing and curing the cement board, wherein the surface of the colored cement layer (5) is dried and then cured and cured to obtain a cement board. . 2. A colored cement (4) containing cement, a pigment and water on a cement base (3) mainly composed of cement.
A cured cement plate provided with a colored cement layer (5) comprising: a dried resin film (9) covering the colored cement layer (5); and curing and curing the cement plate. The method of manufacturing the obtained cement board.