JPS6028779B2 - Inorganic fiber reinforced gypsum composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to mineral fiber reinforced gypsum compositions that provide extremely high strength gypsum products.

In recent years, construction technology has developed significantly, and as buildings become taller and larger, building materials need to be made with higher strength. construction materials are in demand.

Under these circumstances, various inorganic building materials are being considered, and recently the effective use of surplus gypsum discharged from flue gas desulfurization equipment in the chemical industry has been attracting attention. Research is being actively conducted to increase the strength of steel. A known method for obtaining high-strength gypsum products is to strengthen gypsum with various fiber materials, but because of the poor adhesion between the gypsum and the fiber materials, it cannot be expected to improve the strength of the product. There is a problem.

Another method is to mix various polymers with plaster,
Methods of reinforcing with various fiber materials are known, but they have the problem that the materials are expensive because they contain expensive polymers. In order to solve these problems, the present inventors conducted intensive studies and found that a composition containing gypsum and cerium sulfate has improved adhesion to inorganic fiber materials. We have discovered that by reinforcing with inorganic fibers, especially glass fibers, it is possible to obtain inorganic fiber-reinforced gypsum products with extremely high strength, which has not been possible in the past, leading to the present invention.

Examples of the gypsum used in the present invention include Q-type hemihydrate gypsum and B-type hemihydrate gypsum.

These plasters can be used alone or in combination. Examples of cerium sulfate salts used in the present invention include ceric sulfate, ceric sulfate, and ceric ammonium sulfate.The effects of these cerium sulfate salts can be improved by blending them into gypsum, which improves the gypsum composition and inorganic fibers. In particular, the object is to improve the adhesion with glass fibers and to provide an extremely high strength inorganic fiber reinforced gypsum product.

If the amount of these cerium sulfate salts is more than 15.0 parts by weight per 100 parts of gypsum, the curing of the gypsum will be too slow, and if it is less than 0.5 parts by weight, high-strength inorganic fiber-reinforced gypsum products will not be produced. Therefore, the amount of cerium sulfate salt should be 0.5 to 15.0 parts by weight per 10 parts by weight of plaster. A range of parts by weight is desirable. Inorganic fibers used in the present invention include asbestos fibers, Rockwar, glass fibers, and ceramic fibers.

Among these inorganic fibers, glass fibers have a particularly high reinforcing effect on gypsum compositions. If the amount of these inorganic fibers is less than 0.1 parts by weight per 10 parts by weight of plaster, it is impossible to obtain a high-strength inorganic fiber reinforced gypsum product, and if the amount is more than 3 parts by weight, gypsum Not only does the fluidity of the composition decrease and molding workability deteriorate, but also the dispersion state of the inorganic fibers deteriorates and the strength tends to decrease. A range of 1 to 3 parts by weight is desirable. The amount of water used in the present invention is based on 100 parts by weight of gypsum.
If the amount is less than 3 parts by weight, the fluidity of the gypsum composition will deteriorate, resulting in poor molding workability.

Moreover, if the amount is more than 100 parts by weight, it is not possible to obtain a high-strength inorganic fiber reinforced gypsum product, so the amount of water added is preferably in the range of 30 to 10 parts by weight per 10 parts by weight of gypsum. . The present invention will be specifically explained below using Examples and Comparative Examples. Example 1 Gypsum hemihydrate, various cerium sulfate salts, inorganic fibers, and water are mixed in the proportions shown in Table 1 and mixed well to prepare a gypsum slurry.

This prepared gypsum slurry is 40 x 40 x 160 (willow)
The sample was injected into a molding frame, and after completely curing, the mold was removed and the bending strength was measured. The results are shown in Table 1. Furthermore, as a comparative example, a composition containing no cerium sulfate salt was molded under exactly the same conditions as in Example 1, and the bending strength of the molded product obtained is also shown in Table 1. Table 1 Blending ratio of stone pipe composition and bending strength Glass cast iron shade: FES-1310902A (product of Fuji Fiber Class Co., Ltd.) As is clear from Table 1, an example sample using type 8 hemihydrate gypsum Numbers 1-5, 12
It can be seen that molded products No. 1 and No. 13 have higher bending strength than Comparative Example Sample Nos. 1 and 2, which do not contain cerium sulfate salt.

In addition, Example sample numbers 6 to 10, 1 using Q-type hemihydrate gypsum
It can be seen that the molded product of No. 4 and No. 15 has significantly higher bending strength than Comparative Example Sample Nos. 3 and 4, which do not contain cerium sulfate salt. Example 2 5 parts by weight of cerous sulfate and 7 parts by weight of water are mixed with 10 parts by weight of B-type hemihydrate gypsum and mixed well to prepare a gypsum slurry.

Claims (1)

[Claims] 1. Cerium sulfate salt 0.5 per 100 parts by weight of gypsum
An inorganic fiber reinforced gypsum composition containing ~15.0 parts by weight, 0.1 to 30 parts by weight of inorganic fibers, and 30 to 100 parts by weight of water. 2. The inorganic fiber-reinforced gypsum composition according to claim 1, wherein the gypsum is α-type hemihydrate gypsum and/or β-type hemihydrate gypsum. 3 Claim 1 in which the inorganic fiber is glass fiber
The inorganic fiber-reinforced gypsum composition according to item 1 or 2.