JP2674902B2 - Forming method of inorganic plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an inorganic plate, and more particularly to an improvement of a so-called roll slipper forming method for forming a product by supplying a cement compound material having a relatively low water content to a pallet conveyor.

[0002]

2. Description of the Related Art Conventionally, cement roofing materials have been widely used. As this cement roofing material, there is a so-called thick tile in which uneven ridges rich in surface undulation are formed, and when molding such a tile, a relatively high water content is applied on a pallet having a surface for molding the roof tile back surface shape. By supplying the reduced cement mixture, leveling the surface of the cement mixture on this pallet with rolls and slippers and shaping it into a product shape, and then curing this shaped body together with the pallet into a product by the roll slipper molding method A molding method is adopted (for example, JP-A-3-57603 and JP-A-2-185407). This molding method
It is mainly used for molding products that are relatively thick plate-shaped products and that have surface irregularities.

[0003]

[Problems of the prior art] By the way, in the case of the above-mentioned molding method, since the compounding material is a mortar material containing only cement and sand, and the water content is usually as small as about 5%, the workability of the material is poor, and the roll and its proximity There is a problem that the material is likely to be caught in the gap between the slipper and the slipper, and the molding is likely to be interrupted. In addition, since the molded product is temporarily compressed into the product shape on the pallet and shaped, it is difficult to mold a product with a thin thickness due to the relationship between product thickness and compression pressure, which makes it difficult to reduce the weight of the finished product. was there.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a method for forming an inorganic plate capable of forming an unprecedented thin product into a state having sufficient strength in a roll-sliver forming method. It was made for the purpose.

[0005]

[Means for Solving the Problems] That is, the method for molding an inorganic plate according to the present invention comprises: 25 to 35 parts by weight of cement;
35 parts by weight, 35 to 45 parts by weight of finely divided silica, 10 to 14 parts by weight of phenolic resin, methyl cellulose
0.8 to 1.2 parts by weight, water reducing agent to cement ratio of 1.5 parts by weight,
4 to 6 parts by weight of water is added and uniformly mixed, the mixed material is supplied onto a pallet conveyor and shaped into a product shape by a molding roller and slippers, and the shaped body is temporarily cured at 170 to 190 ° C. ×
It is characterized by being autoclaved for 7 hours or more under the condition of 8.5 to 10 atm.

[0006]

The present invention is premised on the roll slipper molding method, the material composition of which is 25 to 35 parts by weight of cement, 25 to 35 parts by weight of silica powder, and 35 to 45 parts by weight of finely divided silica to the basic composition of phenol resin. It is characterized by adding 10 to 14 parts by weight, methyl cellulose 0.8 to 1.2 parts by weight, a water reducing agent to the cement ratio of 1.5 parts by weight, and water 4 to 6 parts by weight.
In the above, the addition of the phenol resin is for improving the strength of the cement matrix, and a powdery novolac type phenol resin is used for facilitating the mixing with the powder material such as cement. The amount of this phenolic resin added is 10 to 14 parts by weight, if it is less than 10 parts by weight, there is no effect of improving the strength, and if it is more than 14 parts by weight, the physical properties as a phenolic resin become strong and the nonflammability of the product decreases. To do.

The addition of methylcellulose is to improve the lubricity of the cement composition, and especially to prevent the material from being caught during roll slipper molding. The amount of methyl cellulose added is 0.8 to 1.2 parts by weight.
If the amount is less than 0.8 parts by weight, sufficient lubricity cannot be obtained, and if the amount is more than 1.2 parts by weight, the effect of imparting lubricity commensurate with the addition is not obtained and it is wasted. The water reducing agent is added for the purpose of imparting shape retention to the product shape.
A value of around 1.5 is sufficient.

After adding 4 to 6 parts by weight of water to the above blended materials and uniformly mixing them to adjust the materials, roof tiles having a predetermined shape are molded by a conventional roll slipper molding device. In this molding, the cement-blended material is provided with methyl cellulose and a water-reducing agent to provide lubricity and shape retention, so that the material is not caught between the roll and the slipper and the surface shape is smoothly molded by the slipper. The product shaped as described above is 170 to 190 ° C. × 8.
Autoclave aged for 7 hours or more under the condition of 5 to 10 atm. During the curing of the autoclave, the phenol resin added at the same time as the cement matrix is hardened is also hardened by the heat during the autoclave and contributes to the strength improvement of the cement matrix.

[0009]

Next, an embodiment of the present invention will be described. FIG. 1 is a side view of an apparatus for performing the method of the present invention.

Materials were prepared according to the formulation shown in Table 1 and uniformly mixed with a mixer. The compounded material 1 was supplied to the material hopper 2, dropped by the agitator 3 in the hopper to the feed conveyor 4 while being stirred, and supplied to the pallet conveyor 5. Next, the material 1 was leveled by the chute 6 so that the average thickness S was 10 mm, and then the forming roll 7 having a diameter of 160 mm and the front gap S ₁ was 6.5 mm and the rear gap S ₂ was 5.8 mm. It was compression molded by the slipper 8 to form a plate-shaped molded product having a thickness of 5.8 mm. The shaped body was temporarily cured at 55 ° C. for 12 hours, then demolded, and autoleaved for 8 hours at 180 ° C. × 10 atm.

[0011]

[Table 1] * 1 in the table is quartz sand with a Blaine value of 3000 to 5000 cm ² / g, * 2
Is silica fume with a Blaine value of 10000 cm ² / g or more, * 3 is a novolac powdered phenolic resin, * 4 is Kao Mighty-150 (polyalkylallyl sulfonate)

The bending strength of the molded product obtained as described above,
When the weight per sheet and the nonflammability test were measured, the results shown in Table 2 were obtained.

[0013]

[Table 2] In Table 2, "with clogging" indicates a state in which the cement material entered between the roll 7 and the slippers 8 and accumulation was observed,
"Good" indicates that no deposition occurred.

As is clear from Table 2, in the case of the method of the present invention, it was found that the material was hardly deposited and accumulated between the roll 7 and the slipper 8 and that a thin plate material having excellent strength was obtained. .

[0015]

As described above, according to the present invention, in the roll slipper molding method, most of the troubles caused by the properties of the material can be eliminated, and a plate material which is thinner and stronger than the conventional one can be molded.

[Brief description of the drawings]

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

[Explanation of symbols]

 1 compounding material 2 hopper 3 agitator 4 conveyor 5 pallet conveyor 6 chute 7 forming roll 8 slipper

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C04B 24:38)

Claims (1)

(57) [Claims] 1. Cement 25 to 35 parts by weight, silica powder 25 to 35
10 to 14 parts by weight of phenolic resin, 0.
8 to 1.2 parts by weight, water reducing agent to cement ratio of 1.5 parts by weight, water 4 to 6 parts by weight are added and uniformly mixed, and the mixed material is fed onto a pallet conveyor and shaped into a product shape by a forming roller and slippers. After the primary curing of the shaped body, 170 to 190 ° C. × 8.
A method for forming an inorganic plate, which comprises performing autoclave curing for 7 hours or more under conditions of 5 to 10 atm.