JPS606301B2 - 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 a00AI2031CaS04Gn&0
0n takes a value of approximately 12, hereinafter referred to as "MSH"
), gypsum blast furnace slag ``A slurry whose main components are cement and water is shaped into a predetermined shape, and this is cured to react MSH and gypsum with water to form calcium aluminate trisulfate hydrate ( Father aOQN
2030CaS049 work day 20·n takes a value of approximately 31 or 32 (hereinafter abbreviated as "TSH")) and was manufactured by hydrating and hardening blast furnace slag and cement. 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 body is ~
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 was considered to add asbestos to a slurry whose main components are MSH, gypsum, blast furnace slag, cement, and water.However, asbestos is a specified chemical substance, There were also problems with the addition of Toasbestos, as its use worsened the working environment and increased costs./In view of these circumstances, the inventors conducted repeated research and found that MSH "Gypsum, Blast Furnace" When a slurry mainly composed of slag, cement, and water contains exfoliated small pieces made by forcibly adding mica, and this is used to produce an inorganic hardened body, cracks do not occur even when heated to high temperatures. They discovered that it is possible to obtain an inorganic cured product that does not cause mica to form, and has properties such as impact resistance and bending strength that are even better than when mica is used as is, and have completed the present invention.

In other words, this invention is based on "MSH, gypsum, blast furnace slag"
The gist of this invention is to shape a slurry containing cement and water as its main components and include flaked pieces of mica, and then cure it.Next, this invention will be explained in detail.In this invention, MSH ``Gypsum, blast furnace slag'' A slurry whose main components are cement and water is used.

Such a slurry is prepared by mixing the above-mentioned raw materials for the slurry and, if necessary, adding reinforcing fabrics such as pulp to glass fiber and additives such as a water reducing agent. In this case, the state of the slurry does not matter. Therefore, it may be in a fluidized state or in a paste-like state.
The term "mainly composed of gypsum, blast furnace slag cement, and water" also includes the case where the entire composition is composed only of these raw materials. Further, among the bride materials for slurry, tocement includes not only T-volt land cement but also all types of cement. In addition, ``Rather than using blast furnace slag and cement separately, bridge furnace cement may be used in place of them.This invention...
Such exfoliated small pieces of Sura River Komica are contained.

To make a slurry containing flaked mica flakes and other essential raw materials, either by adding and mixing the flaked mica flakes containing other essential raw materials, or by mixing the essential raw materials for the slurry. This is done by mixing exfoliated pieces of mica in advance with other essential raw materials when making a slurry. In this case as well, do as follows.
In other words, when hydraulic binders such as blast furnace slag and cement (excluding additives such as reinforcing fibers) are hydrated and hardened to form a matrix, the weight increases by approximately 20%. The weight of the matrix is 1.2 times the total weight of the hydraulic binder.

Therefore, the weight of Tomatotrix should be ``If 142 times the total weight of the hydraulic binder is the standard dissociation amount,'' the weight of Tomatotrix should be 2~i■ cloud amount% (hereinafter abbreviated as ``%'') with respect to this standard blending amount. It is preferable to select "more preferably 4"
It is in the range of ~10%. In other words, ``The effect is greatest when the content of exfoliated small pieces of mica is in the range of 8 to 10% of the standard amount of detachment, and the greatest effect is in the range of 4 to 10%. The proportion of gypsum is “M”
The weight ratio of SH gypsum is 1/0.2 to 1/0.

The total content of blast furnace slag and cement is preferably selected to be 2 to 70% of the standard blending amount.

In addition, the blending standard amount is 65% of the weight of the obtained inorganic cured product.
It is preferable to select it so that That is, the effect is greatest within these ranges. Next, the slurry containing the exfoliated mica particles is shaped into a predetermined shape by normal shaping methods, such as the papermaking method or the Western molding method.
After curing under high temperature), it is cured for about one week in an overflow room and hardened to become an inorganic hardened product. The inorganic cured product obtained in this way does not crack even when heated to high temperatures due to the action of the exfoliated small pieces of mica, and has properties such as impact resistance and bending strength when mica is used as is. even better than.

In other words, this inorganic cured product does not crack even when heated to high temperatures and has high impact resistance and bending strength, so it is particularly useful as a noncombustible building material. When the slurry is shaped by the sanding method, the effect is obtained that the surface condition of the shaped body (plate-like) is improved by the action of the exfoliated small pieces of mica, and the surface condition of the resulting inorganic cured body is also improved. It becomes like this.

Next, Examples will be described together with Comparative Examples.

Examples 1 to 5 MSH 35 parts by weight (hereinafter abbreviated as "Part 1") 2 Water gypsum 2
This part also contained 5 parts of pulp and 2 parts of glass fiber.

On the other hand, mica (particle size 20 mesh manufactured by Kuraray Co., Ltd.) is mixed with 25 parts of blast furnace cement in the amount shown in the table below, water is added to make a slurry, and this is passed through a crusher to make mica It was peeled off into small pieces. Next, the slurry containing the flaked mica particles was added to the above formulation, and water was further added and mixed to create a slurry containing the flaked mica particles and the essential raw materials. Then, this green sheet was pressed and its thickness and specific gravity were adjusted appropriately.Then, the pressed green sheet was placed in a striped heat curing chamber. It was allowed to ripen at a temperature of 7,000℃ and a humidity of 100% RH.Then, it was placed in a polyethylene bag and left at room temperature for one week to cure.Then, after curing, it was dried at 4,500℃ until it reached a constant weight. An inorganic hardened plate with a specific gravity IQQ thickness of 5.5 was obtained.

Comparative example Addition of exfoliated pieces of mica was discontinued.

Other than that, inorganic cured plates of the same dimensions were obtained in the same manner as in Examples 1 to 5. Performance tests were conducted on the inorganic cured plates obtained in the above Examples and Comparative Examples.

The results are also shown in the table below. As is clear from the table,
It can be seen that the inorganic cured plates obtained in the examples all had good flammability evaluation points and are excellent as nonflammable materials, and also have excellent bending strength to Charpy impact strength. In addition, ``According to the examples, it can be seen that the surface condition of the green sheet is improved,'' thereby making it possible to obtain an inorganic cured plate with an excellent surface condition. Regarding the inorganic cured product, the results of the flammability test were almost the same as those of the examples, but the bending strength, shear py impact strength, and surface condition of the green sheet were superior to those of the comparative examples, but It was a little inferior compared to the others.

The tests listed in the table above were conducted as follows.

(l) Combustibility test In the combustibility surface test based on JISAI 321, the size of the cracks that occurred on the cured board after the test was examined by self-inspection, and if the crack was 4, it was judged as passing.

(ii) Bending test The 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.

GliD Green sheet surface condition Judgment was made with the naked eye.

Claims (1)

[Claims] 1. After shaping a slurry containing calcium aluminate monosulfate hydrate, gypsum, blast furnace slag, cement, and water as main components and containing exfoliated small pieces of mica,
A method for producing an inorganic cured product characterized by curing and curing. 2. A method for producing an inorganic cured body according to claim 1, wherein a slurry containing peeled pieces of mica is shaped by papermaking.