JPS6228108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing cement-based molded articles. Conventionally, cement and gypsum-based materials are known as building materials made by extrusion molding, but cement-based materials require 1 to 3 times to cure and harden after extrusion molding.
It requires a period of about a week, and the gypsum type has problems in that it hardens quickly and does not have a sufficient pot life. The present invention solves these problems. That is, the object of the present invention is to provide a method for producing a cement-based molded product, which is characterized by continuous mixing, without curing during extrusion, and curing and curing by heating in a short period of time. First, cements such as blast furnace cement, ordinary Portland cement, and white cement can be used. Two or more of these may be used in combination. For 100 parts by weight of these cements (abbreviated as "parts" below), polypropylene as reinforcing fiber,
Use organic synthetic fibers such as polyester and nylon. The amount used is 0.5 to 5 parts, preferably 1 to 5 parts.
There are 3 parts. Furthermore, synthetic resins such as methylcellulose, carboxymethylcellulose, acrylic ester polymers, vinyl acetate polymers, and polyvinyl alcohol polymers are added as thickeners from 0.5 to
Add 10 parts, preferably 1 to 5 parts. Further, if necessary, 5 to 50 parts, preferably 8 to 20 parts, of filler such as silica, silica sand, powdered pulp, etc. are added. Furthermore, 15 to 30 parts of water is added to prepare a molding composition. In fact, when extruding, 0.5 to 5% of metallic inorganic compounds such as aluminum sulfate, aluminum potassium sulfate, calcium acetate, and calcium chloride are added in advance.
part, preferably 0.75 to 2.0 parts, as an aqueous solution. This is then subjected to extrusion molding. As the extrusion molding machine, it is sufficient to use a known extrusion molding machine. Next, the molded product obtained above is subjected to moist heat curing at 50 to 90°C, preferably 60 to 85°C, for 5 to 24 hours, preferably 8 to 15 hours. In this way, a cured product is obtained. Next, if necessary, the desired molded product is obtained by drying. The molded product obtained as described above is generally used as a wall corner member. However, the purpose is not to limit the use to this kind of use. As described above, the structure of the present invention is based on cement.
A cement slurry with a basic composition of 100 parts by weight, 0.5 to 5 parts by weight of organic synthetic fiber, 0.5 to 10 parts by weight of a thickener, and 15 to 30 parts by weight of water is mixed with aluminum/potassium sulfate, aluminum sulfate, and acetic acid during molding. This is a cement-based molded product characterized by extrusion molding with the addition of one or more metal compounds from the group consisting of calcium and calcium chloride, and with this configuration the following effects can be obtained. Ta. 1 Performance is achieved in a short time by heating using a metal-based inorganic compound. And curing time can be shortened. 2. A molded product with low specific gravity, high strength, and any shape possible to the extent possible by extrusion molding can be obtained. Example 1 Extrusion molding was carried out using the following formulation. Class C blast furnace cement (manufactured by Nippon Cement Co., Ltd.) 70 parts Powder pulp (manufactured by Sanyo Kokusaku Pulp Co., Ltd.) 8〃 Polypropylene fiber (manufactured by Daiwabo Co., Ltd.) 2 parts Methyl cellulose (manufactured by Shin-Etsu Chemical Co., Ltd.) 2〃 Potassium aluminum sulfate (manufactured by Hanui Chemical Co., Ltd.)
1. The obtained molded body was cured at 80° C. and 100% RH for 12 hours to obtain a cured body. Next, it was subjected to constant temperature drying at 50°C and the bending strength was measured. The results are shown in the table. The width of the extruded product is 30mm and the height is 30mm.
It was a rod with an L-shaped cross section and a wall thickness of 12 mm. In addition, to measure the bending strength, use the molded product with a length of 300 mm, and place the molded product face down on a fulcrum with a span distance of 250 mm, with the corner facing up. The test was carried out according to the method of JISA1408, and the strength was expressed as the breaking load. Example 2 Using the same formulation as in Example 1, extrusion molding was carried out using only 2 parts of aluminum potassium sulfate, and then 80%
After curing for 12 hours at 100% R/H at 50°C, constant temperature drying was performed at 50°C, and the bending strength was measured. The results are shown in the table. Example 3 With the same formulation as in Example 1, aluminum sulfate alone was extruded at 0.75 parts, and then cured and molded in the same manner.
It was dried and the bending strength was measured. The results are shown in the table. Example 4 Extrusion molding was carried out using the same formulation as in Example 1 except that potassium aluminum sulfate was added in an amount of 0.5 part. Then, the same curing and drying were performed. The bending strength was measured and the results are shown in the table. Example 5 The same procedure as in Example 1 was carried out except that 2 parts of calcium acetate was used in place of 1 part of potassium aluminum sulfate in Example 1, and the results are shown in the table. Example 6 The same procedure as in Example 1 was carried out except that 2 parts of calcium chloride was used in place of 1 part of potassium aluminum sulfate in Example 1, and the results are shown in the table. Comparative Example 1 Extrusion molding was performed using the formulation of Example 1 without adding potassium aluminum sulfate, and after curing at 80°C, 100R·H for 12 hours, constant temperature drying at 50°C was performed, and the bending strength was measured. The results are shown in the table. Comparative Example 2 Same formulation as Comparative Example 1, 20℃, 100% R・
H. After curing for 12 hours, it was dried at 50°C and the bending strength was measured. The results are shown in the table. 【table】

Claims (1)

[Claims] 1. 100 parts by weight of cement, 0.5 to 0.5 parts by weight of organic synthetic fiber
Metals from the group consisting of potassium aluminum sulfate, aluminum sulfate, calcium acetate, and calcium chloride are added to cement slurry with a basic composition of 5 parts by weight, 0.5 to 10 parts by weight of a thickener, and 15 to 30 parts by weight of water. A method for producing a cement-based molded product, which comprises adding one or more compounds and extrusion molding. 2. A method for producing a cement-based molded article, which further comprises blending 5 to 50 parts by weight of silica or (and) silica sand or (and) powder pulp to the basic composition as described in claim 1.