JPH06190817A - Method for producing fiber-reinforced inorganic plate with uneven pattern - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of this invention is to provide a deep engraving pattern on the surface of an uncured fiber-reinforced inorganic plate material that is difficult to make a deep engraving pattern by pressing. [Constitution] Cement mixture slurry containing cement containing a large amount of C ₂ S finely pulverized to an average particle size of 5 to 10 μ is supplied to a mold surface having an uneven surface to form a plate on the layer. It consists of the step of curing the cured inorganic plate material and curing it as it is, improving the adhesiveness between the cement particles of the surface layer and the inorganic plate which is the base material by its components, and also improving the physical properties of the surface uneven pattern layer itself. .

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 fiber-reinforced inorganic plate having an uneven pattern.

[0002]

2. Description of the Related Art Conventionally, a fiber-reinforced inorganic board mainly composed of cement has been widely used as a building material. These fiber-reinforced inorganic boards can be provided with an arbitrary uneven pattern on the surface by pressing, and have the advantage that a large number of architectural boards with various designs can be mass-produced.

[0003]

However, when a plate-like body is formed by, for example, an extrusion molding method, it is difficult to form a deep concave-convex pattern by pressing because these molded products have poor fluidity of the material immediately after the molding. There was a drawback in that the material cracked when pressed with a high pressure. Also, in extrusion molding, the material is compressed under high pressure and extruded, so the specific gravity of the product tends to be high, and in order to reduce the weight, a large amount of organic or inorganic foam aggregate is used. The extrusion-molded product containing the aggregate has a low shape-retaining property, and therefore, there is a problem that the product shape itself is damaged if a high-pressure press is performed.

Further, in the papermaking method, a large amount of reinforcing fibers are contained in the material mixture, and the fibers are likely to be exposed on the surface of the base material to easily cause fluffing. For this reason, a deeply uneven pattern of carving or fine pattern unevenness is produced. There was a drawback that the pattern was hard to attach. Further, the plate material obtained by the papermaking method has a low water content, and thus there is a problem that it is difficult to form an uneven pattern by pressing.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has an uneven surface which can be provided with an uneven pattern on the surface of an uncured fiber-reinforced inorganic plate material which is difficult to make a deep uneven pattern by pressing. The purpose of the present invention is to provide a method for producing a patterned fiber-reinforced inorganic plate.

[0006]

That is, the method for producing a fiber-reinforced inorganic plate having an uneven pattern according to the present invention has an average particle size of 5 to
Cement mixture slurry whose main component is cement containing a large amount of C ₂ S finely pulverized to 10 μ is supplied to a mold surface having an uneven surface, and an inorganic plate material formed into a plate shape is placed on this slurry, and as it is. It is characterized by being cured and cured in the state of.

[0007]

In the present invention, the surface pattern is a pallet or a template, and a mold having an uneven pattern on the bottom is used. The mold surface was finely pulverized to an average particle size of 5 to 10μ.
Cement mixture slurry whose main component is cement containing a large amount of C ₂ S is poured to form a surface layer, on which a plate-shaped body formed by extrusion molding or papermaking is laminated and integrated for curing. Let it cure. The molded plate-shaped body may be before curing or after curing.

The C ₂ S-rich cement is a cement composed of the components shown in the following cement composition table, such as moderate heat Portland cement, and has higher strength than ordinary C ₃ S-rich Portland cement.

Cement composition table Cement type C ₃ SC ₂ SC ₃ AC ₄ AF Normal Portland cement 50 25 9 9 Moderate heat Portland cement 42 36 3 12

Also, the drying shrinkage is small and the release of calcium hydroxide is small as shown by the following equation. C ₃ S: 2Ca ₃ Si0 ₅ ＋ 6H ₂ O → Ca ₃ Si0 ₃ O ₇ ＋ 3H ₂ O ＋ 3Ca (OH) ₂ C ₂ S: 2Ca ₂ Si0 ₄ ＋ 4H ₂ O → Ca ₃ Si0 ₃ O ₇ ＋ 3H ₂ O ＋ Ca (OH) ₂

The average particle size of this cement is finely pulverized to 5 to 10 μm in order to improve the permeability of the cement particles into the molded plate to be laminated and to make the texture of the surface pattern layer dense and hard. is there. Therefore, the molded plate-like body as the base material and the surface layer are strongly integrated by the hydration reaction of the cement of each other, and the surface layer has a very smooth surface with smoothness due to the mold surface. A pattern is obtained.

[0012]

Embodiments of the present invention will be described below.

(Example 1) 50-80 parts by weight of medium heat Portland cement finely pulverized to an average particle size of 5-10 μ, pigment 10
~ 20 parts by weight, 10 to 30 parts of aggregate, a water reducing agent and water are added and kneaded to prepare a cement slurry having a solid content concentration of 50%,
This slurry is poured into a mold having a mold surface with a maximum unevenness difference of 5 mm and a wood-like unevenness pattern until the uneven surface is completely hidden, and then the uncured plate-like body with a thickness of 8 mm obtained by extrusion molding on the surface of this slurry. Layered and demolded after 12 hours of natural curing
It was autoclaved for 18 hours.

Example 2 As in Example 1, a 5 mm-thick fiber-reinforced inorganic plate obtained by the papermaking method was laminated on a mold to which the slurry had been supplied, and natural curing and autoclave curing were performed in the same manner as in Example 1. .

(Example 3) As in Example 1, a 5 mm thick fiber-reinforced inorganic plate cured by curing was laminated on a mold to which the slurry had been supplied, and natural curing and autoclave curing were carried out in the same manner as in Example 1.

(Comparative Example 1) The surface of the extruded plate used in Example 1 was directly pressed by a pressing machine having a pressing surface with a grain-like unevenness pattern of 3 mm. Comparative Example 2 The surface of the plate-like body produced by the paper-making method used in Example 2 was patterned by the same press as in Comparative Example 1.

In Examples 1 to 3, it was observed that an uneven pattern having an unevenness difference of 5 mm was attached very sharply.
In Comparative Example 1, it was observed that cracks were generated in the edge portion of the plate material, and in Comparative Example 2, the boundaries of the irregularities were not sufficient and only a vague appearance irregularity pattern could be applied. It was

Examples 1 to 3 after curing in an autoclave
The surface of the molded articles of Comparative Examples 1 and 2 was observed. The surface hardness of Examples 1 to 3 was harder than that of Comparative Example, and the surface was polished with a polishing device. Although the surface could be finished, the surface of the comparative example was heavily worn and the disappearance of the convex portion of the pattern was observed.

[0019]

As described above, according to the present invention, it is possible to easily form a deep concave-convex pattern on the surface of an uncured inorganic plate material which has been difficult to pattern by a conventional press, and to form a surface layer. Since cement containing a large amount of C ₂ S is used as the cement layer, its strength is superior to that of ordinary Portland cement, and since drying shrinkage is small and less calcium hydroxide is released, various effects such as reinforcement of the base material can be expected. Have. Furthermore, since the cement that constitutes the surface layer has a very small particle size, it has good adhesion to the molded plate that is the base material before and after curing, and a fiber-reinforced inorganic plate with an uneven pattern that has excellent strength without delamination. It has the effect that it can be manufactured.

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Claims (1)

[Claims] 1. A cement mixture slurry comprising a C ₂ S-rich cement finely ground to an average particle size of 5 to 10 μm,
A method for producing a fiber-reinforced inorganic plate with a concavo-convex pattern, which comprises supplying to a mold surface having a concavo-convex mold surface, laminating an inorganic plate material formed into a plate shape on this slurry, and curing-curing in that state.