JPS6012989B2 - Manufacturing method of inorganic cured body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an inorganic cured body used as a building material, particularly a noncombustible building material.

BACKGROUND ART Inorganic cured bodies used as building materials and the like have been manufactured in the following manner.

That is, calcium aluminate monosulfate hydrate (father a0, AI2Q, CaS04, n ratio 0,
n has a value of approximately 12 (hereinafter abbreviated as "MSH"), a slurry whose main components are gypsum, blast furnace slag, cement, and water is formed into a predetermined shape, and this is cured to form MSH and gypsum. Calcium aluminate trisulfate hydrate (*a○・N2
○3・*aS〇4・mH2〇, where n takes a value of approximately 31 or 32 (hereinafter abbreviated as "TSH")), and it is manufactured by hydrating and hardening blast furnace slag and cement. Ta. The inorganic cured body produced in this manner has high impact strength and bending strength, and is excellent as a building material. However, this inorganic cured product
When heated to high temperatures, it shrinks and cracks, which poses a problem as a noncombustible building material. Therefore, in order to solve this problem, it has been considered to add asbestos as a shrinkage preventive agent to a slurry whose main components are MSH, gypsum, blast furnace slag, cement, and water. However, asbestos is a specified chemical substance, and its use worsens the working environment and increases costs, so adding asbestos also poses problems. In view of these circumstances, the inventors conducted extensive research to find an anti-shrinkage agent to replace asbestos, and as a result, they found that zeolite, perlite, diamond rock powder, and rock wool are extremely effective as anti-shrinkage agents. Furthermore, the inventors have found that the other properties (bending strength, impact resistance, etc.) of the inorganic cured product do not deteriorate when used, but rather improve, and have completed this invention. That is, this invention
H. A method for producing an inorganic hardened body by shaping a slurry mainly composed of gypsum, blast furnace slag, cement, and water, then curing and hardening it, which consists of zeolite, barite, jamon rock powder, and rock wool. The gist of this invention is a method for producing an inorganic cured product, which is characterized by using at least one inorganic substance selected from the group as an anti-shrinkage agent.

Next, this invention will be explained in detail.

In this invention, a slurry whose main components are MSH, gypsum, blast furnace slag, cement, and water is used.

Such a slurry can be prepared by a conventional method, that is, by mixing the above-mentioned raw materials for the slurry and, if necessary, adding additives such as pulp, reinforcing fibers such as glass fibers, and water reducing agents. Manufactured by. In this case, the state of the slurry does not matter. Therefore, it may be in a highly fluid state or in a pasty state. Also, MSH
, gypsum, blast furnace slag, cement, and water as the main components includes cases where the entire composition is composed only of the main components. Further, among the raw materials for slurry, cement includes not only Boltland cement but also all types of cement. Furthermore, instead of using blast furnace slag and cement separately, blast furnace cement may be used instead. The present invention contains at least one inorganic substance selected from the group consisting of sura IJI zeolite, perlite, jamonite powder, and rock wool.

In order to contain such inorganic substances in the slurry, slurry IJ
This can be done by adding and mixing the inorganic substance, or by pre-blending it into the slurry raw material when mixing the slurry raw materials to form a slurry. in this case,
The amount of inorganic material used varies depending on its type. M.S.H.
Hydraulic binders such as gypsum, blast furnace slag, and cement (
(excluding additives such as reinforcing fibers) is hydrated and hardened to form a matrix, the weight increases by approximately 20%, so the weight of the matrix is 1.2 times the total weight of the hydraulic binder. becomes. Therefore, assuming that the weight of the matrix, that is, 1.2 times the total weight of the hydraulic binder, is the standard blending amount, when using zeolite as an inorganic substance, the amount used should be 2
It is preferable to select a proportion of .about.2% by weight (hereinafter abbreviated as "%"). More preferably it is 4 to 20%. Furthermore, when using pearlite as an inorganic substance,
It is preferable to select the amount used so that the percentage of pearlite is 3% or more with respect to the standard blending amount. More preferably it is 5% or more. Further, when jamonite powder is used as the inorganic material, it is preferable to select the amount to be used such that the jamonite powder accounts for 2% or more of the blending standard amount. More preferably, it is 4% or more. Furthermore, when rock wool is used as the inorganic substance, it is preferable to select the amount used so that the ratio of rock wool to the standard blending amount is 2% or more. More preferably, it is 4% or more. Even when these inorganic substances are used together, it is preferable that each compound is within the above range. That is, if the amount of the inorganic substance used is out of the above range, the effect will be reduced. In addition, the ratio of MSH and gypsum in the slurry is such that the weight ratio of MSH/gypsum is 1.
/0.2 to 1/0.7, and the total content of blast furnace slag and cement is preferably selected to be 2 to 70% of the standard blending amount. Further, it is preferable to select the standard blending amount so that it accounts for 65% of the obtained inorganic cured product. That is, the effect is greatest within these ranges. Next, the slurry containing the inorganic substance is shaped into a predetermined shape by a normal shaping method, that is, by a papermaking method, a casting method, etc.
Then, for example, moist heat curing (curing performed at high temperature or under high temperature)
After that, it is cured at room temperature for about one week to become a cured inorganic product. The inorganic cured product thus obtained does not crack due to shrinkage even when heated to high temperatures due to the action of the inorganic substance as a shrinkage inhibitor, and has excellent impact resistance and bending strength. That is, this inorganic cured product does not crack even when heated to high temperatures, so it is particularly useful as a noncombustible building material. Next, examples will be described together with comparative examples. Examples 1 to 5 MSH 35 parts by weight (hereinafter abbreviated as "parts"), dihydrate gypsum 2
Eaves, 25 parts of blast furnace cement, 5 parts of pulp, 2 parts of glass fiber
A slurry was prepared by adding water and mixing.

Next, rock wool was added and mixed in the amount shown in Table 1 below, and this was sand-molded to produce a green sheet (plate-shaped excipient). Next, this green sheet was pressed to adjust its thickness and specific gravity appropriately. Next, the pressed green sheet was placed in a heat and humidity curing chamber, and was aged at a temperature of 70 degrees Celsius and a humidity of 100% RH. Next, this was placed in a polyethylene bag and left for one week at room temperature for curing. Then, the cured material is dried at 45q0 until it reaches a constant weight, with a specific gravity of 1.
An inorganic hardened plate with a thickness of 0.0 and 5.5 ribs was obtained. Comparative Example 1 Addition of rock wool was discontinued.

Inorganic cured plates were obtained in the same manner as in Examples 1 to 5 except for the above. A performance test was conducted using the inorganic materials obtained in Examples 1 to 5 and Comparative Example 1 above. The results are also shown in the table below. As is clear from the table, all of the inorganic hard iris armpits obtained in Examples 1 to 5 had good flammability evaluation scores and were excellent as nonflammable materials, and were also excellent in bending strength and Charpy impact strength. I understand. Table 1 The tests in Table 1 were conducted as follows (the same applies to Tables 2 to 4 below).

(i) In the flammability surface test based on flammability test JISAI321,
The size of cracks that occurred on the cured board after the test was visually evaluated on a five-point scale and an evaluation score was given.

The smaller and better the crack, the higher the score. (
ii) Bending test Bending strength was measured using a No. 4 test piece based on JISAI408.

(iii) Charpy impact test A Charpy impact test was conducted according to JIS K6911.

Examples 6 to 10 Zeolite was used in place of rock wool in an amount shown in Table 2 below.

Inorganic cured plates were obtained in the same manner as in Examples 1 to 5 except for the above. Comparative Example 2 The use of zeolite was discontinued.

Inorganic cured plates were obtained in the same manner as in Examples 6 to 10 except for the above. Performance tests were conducted on the inorganic cured plates obtained in Examples 6 to 10 and Comparative Example 2 above. The results are also shown in the table below. As is clear from the table, the inorganic cured plates obtained in Examples 6 to 10 all have good flammability evaluation scores and are excellent as nonflammable materials, and are also excellent in bending strength and Charpy impact strength. Recognize. It can also be seen that according to Examples 6 to 10, the surface condition of the green sheets is improved, thereby providing inorganic cured plates with excellent surface conditions. Table 2 Examples 11 to 15 Perlite was used in place of rock wool in an amount shown in Table 3 below.

Inorganic cured plates were obtained in the same manner as in Examples 1 to 5 except for the above. Comparative Example 3 The use of perlite was discontinued.

Inorganic cured plates were obtained in the same manner as in Examples 11 to 15 except for the above. Performance tests were conducted on the inorganic cured plates obtained in Examples 11 to 15 and Comparative Example 3 above. The results are also shown in the table below. As is clear from the table, Examples 11-1
It can be seen that all of the inorganic cured plates obtained in No. 5 have good flammability evaluation scores and are excellent as nonflammable materials, and are also excellent in bending strength and Charpy impact strength. Table 3 Examples 16 to 20 Jamonite powder was used in place of rock wool in an amount shown in Table 4 below.

Inorganic cured plates were obtained in the same manner as in Examples 1 to 5 except for the above. Comparative Example 4 The use of jamonite powder was discontinued.

Inorganic cured plates were obtained in the same manner as in Examples 16 to 20 except for the above. Performance tests were conducted on the inorganic cured plates obtained in Examples 16 to 20 and Comparative Example 4 above. The results are also shown in the table below. As is clear from the table, Examples 16-2
It can be seen that all of the inorganic cured plates obtained in Example 0 have good flammability evaluation scores and are excellent as nonflammable materials, and are also excellent in bending strength and Charpy impact strength. Table 4

Claims (1)

[Claims] 1. A method for producing an inorganic hardened body by shaping a slurry whose main components are calcium aluminate monosulfate hydrate, gypsum, blast furnace slag, cement, and water, and then curing and hardening the slurry, which comprises zeolite, pearlite, 1. A method for producing an inorganic cured product, characterized in that at least one inorganic substance selected from the group consisting of diamond rock powder and rock wool is used as an anti-shrinkage agent.