JPH09169017A - Production of inorganic panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten not only the time required in press molding but also a demolding time. SOLUTION: In an inorg. panel manufacturing method wherein an aq. slurry based on cement is cast into a mold and excessive water contained in the aq. slurry is removed by press molding, the aq. slurry is heated before press molding is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic plate, and more particularly, to a method for producing an inorganic plate useful for use as a building plate.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing an inorganic plate,
Along with the papermaking method and extrusion method, a method was used in which an aqueous slurry containing cement as a main component was poured into a mold, and while this aqueous slurry was subjected to press molding, excess water contained in the aqueous slurry was removed. . Then, if necessary, the aqueous slurry formed into a green plate was subjected to autoclave curing or steam curing to be manufactured as an inorganic plate.

[0003]

However, in such a method for producing an inorganic plate, the time required for press molding to remove excess water tends to be long, and even if the pressure for press molding is increased. However, it did not lead to a reduction in the time required for press molding, but it had a limit. In addition, the time required to demold the aqueous slurry formed into a green plate after press molding is long, and in any case, it is not good in terms of productivity.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to shorten the time required for press molding and to shorten the demolding time. It is to provide a method for manufacturing an inorganic plate.

[0005]

According to a first aspect of the present invention, there is provided an inorganic plate manufacturing method, wherein an aqueous slurry containing cement as a main component is poured into a mold, and excess water contained in the aqueous slurry is press-molded. In the method for producing an inorganic plate that is removed by applying the above method, the aqueous slurry is heated before performing the press molding.

The method for manufacturing an inorganic plate according to a second aspect of the present invention is characterized in that the heating is performed by high frequency.

In the method for manufacturing an inorganic plate according to claim 3 of the present invention, the temperature of the aqueous slurry is changed by the heating.
It is characterized in that the temperature is set to 40 to 80 ° C.

A method for manufacturing an inorganic plate according to a fourth aspect of the present invention is characterized in that the aqueous slurry is cured by autoclave curing to form tobermorite.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

In the method for producing an inorganic plate of the present invention, an aqueous slurry containing cement as a main component is poured into a mold, and excess water contained in the aqueous slurry is removed by press molding to produce an inorganic plate. In the method, the aqueous slurry is heated before performing the press molding.

The above-mentioned aqueous slurry contains cement as a main component, and, for example, an aggregate is mixed therein, and if necessary, a reinforcing material and a fiber are mixed as auxiliary components. It can be obtained by a net method or the like. Then, the blended components are kneaded into an aqueous slurry, for example.

As the above-mentioned cement, for example, portland cement, fly ash cement, blast furnace cement and the like are used.

As the above-mentioned aggregate, crushed stones such as granite and serpentine, silica stone powder, shirasu balloon, glass balloon, silica, pearlite, sand and beads are used.

Pulp powder or the like is usually used as a reinforcing material to be blended if necessary. Further, as the fibers, for example, cellulose-based pulp fibers, mineral fibers such as asbestos, polypropylene, organic resin fibers such as vinylon, glass fibers, carbon fibers,
Metal fibers or the like can be used.

The above-mentioned aqueous slurry is poured into a mold, and is formed, for example, in a green plate shape.
As the mold, a mold having an uneven pattern or the like may be used in advance. Then, excess water contained in this aqueous slurry is removed by press molding.

During the press molding, in order to promote removal of excess water contained in the aqueous slurry, the aqueous slurry is heated before the press molding is performed. By heating in this way, the water in the aqueous slurry is activated, the removal rate of excess water during press molding, that is,
The dehydration rate can be increased.

As the heating method, various methods such as a method using hot air, a method using heat transfer, and a method using radiation can be considered. Particularly, if the heating is performed by high frequency, so-called electronic It is even more effective when it is heated uniformly from the inside of the aqueous slurry like a microwave oven to form a thick plate-like one, and since it can be heated in a short time,
It is also efficient.

Furthermore, when the temperature of the aqueous slurry is brought to 40 to 80 ° C. by the above heating, the water in the aqueous slurry is more effectively activated at this temperature, and press molding is performed. The removal rate of excess water at that time, that is, the dehydration rate can be further increased. Moreover, since heating is performed to some extent like this temperature, it is easy to shorten the curing time of the aqueous slurry formed into a green plate.

If the temperature of the aqueous slurry is lower than 40 ° C. by the above heating, it becomes difficult to sufficiently obtain the effect of heating, and as a result, the removal rate of excess water during press molding, that is, , It is difficult to increase the dehydration speed. Further, when the temperature of the aqueous slurry exceeds 80 ° C. due to the heating, a rapid reaction occurs in the aqueous slurry to make the curing unstable, and at the same time, the raw plate-like material contained in the mold is produced. The aqueous slurry of is difficult to demold, and moreover, the water in the aqueous slurry is rather inactivated, and the removal rate of excess water during press molding, that is, the dehydration rate cannot be increased. It is a thing.

During press molding, the mold may be provided with a dehydration hole, if necessary, and a felt may be laid on the upper surface of the mold.

Further, curing is performed to obtain an inorganic plate. The curing is carried out in an autoclave, which is cured at 150 to 200 ° C. for 7 to 15 hours to obtain an inorganic plate.

Before the autoclave curing, if necessary, a green plate-shaped aqueous slurry may be added at room temperature for 2 to 5 hours.
It is also possible to adopt a method such as leaving it to stand and then performing steam curing for 10 to 100 hours at a temperature of 50 to 90 ° C. filled with steam.

According to the present invention, by adopting such a method, when the aqueous slurry is heated, the water in the aqueous slurry is activated to increase the removal rate of excess water during press molding, that is, the dehydration rate. Is something that
As a result, the time required for press molding can be shortened, and further, the demolding time can be shortened by increasing the curing speed accompanying the shortening of the time required for press molding. That is, the productivity can be greatly improved.

The method for producing an inorganic plate of the present invention further comprises
The aqueous slurry is cured by autoclave curing to form tobermorite.

By adopting such a method, the curing and curing of the green plate-shaped aqueous slurry is promoted, and the inorganic plate can be obtained more easily, and the inorganic substance obtained by the formed tobermorite can be obtained. It is possible to improve the durability of the plate, etc., and improve the quality of the inorganic plate comprehensively.

[0026]

Examples of the present invention will be described below.

Example 1 An aqueous slurry having a concentration of 20 wt% containing 100 parts by weight of Portland cement, 10 parts by weight of pulp powder, 100 parts by weight of fly ash, and 840 parts by weight of water was kneaded and poured into the mold. Then, high frequency heating was performed so that the temperature of the aqueous slurry became 40 ° C.

After this, while the aqueous slurry was kept in the mold, press molding was performed to remove excess water contained in the aqueous slurry, and the aqueous slurry was made into a green plate. The pressure of this press molding is 4 MPa,
As a result, the molding time required was 18 seconds.

Then, the raw plate-shaped aqueous slurry was removed from the mold. As a result, the required demolding time was 2.0 hr, and the mold release property of the raw plate-shaped aqueous slurry was good. (In Table 1, it was marked with ◯.) Next, steam curing was performed at a temperature of 80 ° C. for 30 hours, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Example 2 In the same manner as in Example 1, the aqueous slurry was kneaded, poured into a mold, and high frequency heating was performed so that the temperature of the aqueous slurry was 60 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 15 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold, and as a result, the required demolding time was 1.5 hr, and the mold release property of the raw plate-shaped aqueous slurry was very good. (In Table 1, this is marked with ⊚.) Next, steam curing was carried out in the same manner as in Example 1, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Example 3 In the same manner as in Example 1, the aqueous slurry was kneaded, poured into a mold, and high frequency heating was performed so that the temperature of the aqueous slurry became 80 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 14 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold. As a result, the required demolding time was 1.0 hr, and the mold release property of the raw plate-shaped aqueous slurry was very good. (In Table 1, this is marked with ⊚.) Next, steam curing was carried out in the same manner as in Example 1, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Example 4 100 parts by weight of Portland cement, 12 parts by weight of pulp powder, 100 parts by weight of fly ash, 1000 parts by weight of water,
An aqueous slurry having a concentration of 20 wt% containing 38 parts by weight of silica was kneaded, and the same aqueous slurry was poured into a mold,
High frequency heating was performed so that the temperature of the aqueous slurry was 40 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 17 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold. As a result, the required demolding time was 3.0 hr, and the mold release property of the raw plate-shaped aqueous slurry was good. (In Table 1, it is marked with ◯.) Next, steam curing is performed at a temperature of 80 ° C. for 20 hours,
The autoclave was cured at a temperature of 180 ° C. for 10 hours, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Example 5 100 parts by weight of Portland cement, 12 parts by weight of pulp powder, 100 parts by weight of fly ash, 1000 parts by weight of water,
An aqueous slurry having a concentration of 20 wt% containing 38 parts by weight of silica was kneaded, and the same aqueous slurry was poured into a mold,
High frequency heating was performed so that the temperature of the aqueous slurry became 60 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 16 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold. As a result, the demolding time required was 2.0 hr, and the mold release property of the raw plate-shaped aqueous slurry was very good. (In Table 1, it is marked with ⊚.) Next, steam curing and autoclave curing were performed in the same manner as in Example 4, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Example 6 100 parts by weight of Portland cement, 12 parts by weight of pulp powder, 100 parts by weight of fly ash, 1000 parts by weight of water,
An aqueous slurry having a concentration of 20 wt% containing 38 parts by weight of silica was kneaded, and the same aqueous slurry was poured into a mold,
High frequency heating was performed so that the temperature of the aqueous slurry became 80 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 15 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold, and as a result, the required demolding time was 1.0 hr, and the mold release property of the raw plate-shaped aqueous slurry was good. (In Table 1, it was marked with ◯.) Next, steam curing and autoclave curing were performed in the same manner as in Example 4, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Comparative Example 1 In the same manner as in Example 1, the aqueous slurry was kneaded, poured into the mold, and heated so that the temperature of the aqueous slurry was 20 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 30 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold. As a result, the required demolding time was 6.0 hr, and the mold release property of the raw plate-shaped aqueous slurry was not good. (In Table 1, it was described as Δ.) Next, steam curing was performed in the same manner as in Example 1, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

Comparative Example 2 100 parts by weight of Portland cement, 12 parts by weight of pulp powder, 100 parts by weight of fly ash, 1000 parts by weight of water,
An aqueous slurry having a concentration of 20 wt% containing 38 parts by weight of silica was kneaded, and the same aqueous slurry was poured into a mold,
Heating was performed so that the temperature of the aqueous slurry was 20 ° C.

Thereafter, press molding was carried out in the same manner as in Example 1, and as a result, the molding time required was 30 sec.

Then, the raw plate-shaped aqueous slurry was removed from the mold, and as a result, the required demolding time was 8.0 hr, and the releasability of the raw plate-shaped aqueous slurry was poor.
(In Table 1, it was described as x.) Next, steam curing and autoclave curing were performed in the same manner as in Example 4, and after the completion, an inorganic plate having a thickness of 12 mm could be obtained.

The data of the results obtained in Examples 1 to 6 and Comparative Examples 1 to 2, that is, molding time, demolding time, and releasability are summarized in Table 1 below.

[0052]

[Table 1]

As can be seen by comparing Table 1 with those of Examples 1 to 6 and Comparative Examples 1 and 2 together with the above description, both the molding time and the demolding time 1
Nos. 6 to 6 are much shorter than Comparative Examples 1 to 2, and when the aqueous slurry is heated, water in the aqueous slurry is activated to increase the removal rate of excess water during press molding, that is, the dehydration rate. As a result, the time required for press molding can be shortened, and furthermore, the demolding time can be shortened by increasing the curing speed accompanying the shortening of the time required for press molding. Can be said.

Further, those of Examples 1 to 6 and Comparative Examples 1 and 2
As can be seen by comparing those of Examples, it can be said that those of Examples 1 to 6 also have better releasability.

From the above, it can be said that the method for producing an inorganic plate of the present invention can greatly improve the productivity.

[0056]

According to the method for producing an inorganic plate according to claim 1 of the present invention, when the aqueous slurry is heated, the water in the aqueous slurry is activated to remove excess water during press molding, that is, dehydration. As a result, the time required for press molding can be shortened, and the demolding time can be shortened by increasing the curing speed accompanying the shortening of the time required for press molding. Is something that can be done. That is, the productivity can be greatly improved.

According to the method for producing an inorganic plate according to the second aspect of the present invention, in addition to the case of the first aspect, a thick plate-like material is obtained by heating uniformly from inside the aqueous slurry like a so-called microwave oven. When it is formed, it is more effective, and since it can be heated in a short time, it is efficient.

According to the method for producing an inorganic plate according to claim 3 of the present invention, in addition to the case of claim 1 or 2, the water in the aqueous slurry is more effectively activated at this temperature. The removal rate of excess water during press molding, that is, the dehydration rate can be further increased. Moreover, since the heating is performed to some extent like this temperature, the curing time of the aqueous slurry can be shortened easily.

According to the method for producing an inorganic plate according to claim 4 of the present invention, in addition to the case according to any one of claims 1 to 3, the curing and curing of the raw plate-shaped aqueous slurry is promoted, which is easier. In addition to being able to obtain an inorganic plate, the formed tobermorite can improve the durability and the like of the obtained inorganic plate and improve the quality of the inorganic plate comprehensively.

Claims (4)

[Claims] 1. A method for producing an inorganic plate in which an aqueous slurry containing cement as a main component is poured into a mold, and excess water contained in the aqueous slurry is removed by press molding. First, a method for producing an inorganic plate, which comprises heating the aqueous slurry. 2. The method for producing an inorganic plate according to claim 1, wherein the heating is performed by high frequency. 3. The method for producing an inorganic plate according to claim 1, wherein the temperature of the aqueous slurry is set to 40 to 80 ° C. by the heating. 4. The method for producing an inorganic plate according to claim 1, wherein the aqueous slurry is cured by autoclave curing to form tobermorite.