JPH09255385A - Method for producing inorganic plate and inorganic plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop strength in an early stage without preventing the hydration reaction of a cement by adding a wood material with deposition of a preventing agent against hardening inhibition into a hydraulic material essentially comprising a cement. SOLUTION: The preventing agent against hardening inhibition such as a hardening accelerator and water repelling agent which accelerates hardening of a cement component is deposited on the surface of a wooden material such as pulp, wood chips, wood wool or wood fibers by 0.5 to 10.0wt.% of the cement component. The obtd. wooden material and a hydraulic material essentially comprising a cement are mixed and formed to obtain an inorg. plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an inorganic plate and the inorganic plate, and more particularly to a method for manufacturing an inorganic plate useful for building boards and the like. is there.

[0002]

2. Description of the Related Art Conventionally, as a method for producing an inorganic plate in which pulp is contained to reinforce the mechanical strength, a wet method by a papermaking method is generally well performed because of its excellent productivity. It was a thing. On the other hand,
Along with the variety of uses of the inorganic plate, a new dry method has been devised.

The above pulp is mainly composed of cellulose fibers, and the cellulose fibers contain lignin,
It contained organic substances such as sugar.

[0004]

However, in such a method for producing an inorganic plate and the inorganic plate, since the pulp made of cellulose fibers contains organic substances such as lignin and sugar, It has been found that organic substances hinder the hydration reaction in the hardening process due to the hydration of cement and cause hardening inhibition of the cement. Especially, in the dry method, it is easy to cause the hardening inhibition because the water content is small. It was a thing. That is, in order to avoid curing inhibition, it has to be cured at a low temperature, and since some curing inhibition is unavoidable, it is not possible to express the necessary strength with curing for a short time,
It was necessary to carry out curing for a long time, and as a result, the productivity was significantly reduced.

Therefore, as shown in FIG. 3, a fibrous material (2) such as pulp is defibrated by a hammer mill (5) and a hydraulic material (1) such as cement is mixed by an Erich mixer (3). At this time, a method of mixing and adding a drug (6) such as a calcium chloride solution to obtain the mixed material (4) was conceived, but it was not possible to sufficiently avoid the inhibition of curing. Even if the addition amount of this chemical (6) is increased, although curing inhibition can be somewhat avoided, a large amount of chlorine gas and sulfurous acid gas, which are components contained in the chemical (6), are generated during curing. It has been a cause of corroding the raw plate-shaped inorganic plate.

The fiber material (2) such as pulp may be dipped in a solution of the chemical agent (6) to be treated.
In this case, in order to adopt it in the dry method, it must be defibrated and dried, which complicates the process.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and the purpose thereof is to be simple but to develop strength early without inhibiting the hydration reaction of cement. (EN) Provided is a method for producing an inorganic plate, and the inorganic plate.

[0008]

The method for producing an inorganic plate according to claim 1 of the present invention is the method for producing an inorganic plate in which a wood material is added to a hydraulic material (1) containing cement as a main component. It is characterized in that a chemical agent (6) for preventing hardening inhibition by the wood material is attached to the surface of the wood material before being added to the hydraulic material (1).

In the method for producing an inorganic plate according to claim 2 of the present invention, when the fiber material (2) among the wood materials is dry defibrated, the chemical agent (6) is added to the fiber material (2). ) Is attached by spraying.

In the method for producing an inorganic plate according to claim 3 of the present invention, among the above woody materials, after the fiber material (2) is dry defibrated and before it is added to the hydraulic material (1),
The chemical agent (6) is attached to the fiber material (2) by a gas phase reaction.

The method for producing an inorganic plate according to a fourth aspect of the present invention is characterized in that the drug (6) is a higher fatty acid.

The method for producing an inorganic plate according to a fifth aspect of the present invention is characterized in that the chemical agent (6) is added in an amount of 0.5 to 10.0 wt% with respect to the cement content.

The inorganic plate according to claim 6 of the present invention is an inorganic plate obtained by adding a wood material to a hydraulic material (1) containing cement as a main component, before addition to the hydraulic material (1). Up to now, the agent (6) for preventing hardening inhibition by the wood material is attached to the surface of the wood material.

[0014]

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

FIG. 1 is a block diagram showing an outline of a method for manufacturing an inorganic plate according to an embodiment of the present invention. FIG.
FIG. 6 is a block diagram schematically showing a method for manufacturing an inorganic plate according to another embodiment of the present invention.

As shown in FIGS. 1 and 2, the method for producing an inorganic plate of the present invention is the same as the method for producing an inorganic plate in which a wood material is added to a hydraulic material (1) containing cement as a main component. Before the addition to the material (1), the chemical agent (6) for preventing hardening inhibition by the wood material is attached to the surface of the wood material.

The hydraulic material (1) contains cement as a main component, and also contains, for example, an aggregate.

As the above wood material, for example, pulp is usually used, but the wood material is not limited to this.
Besides, wood chips, wood wool, wood fibers, etc. can be used. This wood material is added to the hydraulic material (1).

As the above-mentioned cement, for example, Portland cement, fly ash cement, blast furnace cement and the like are used. Further, as the aggregate, crushed stone such as granite, serpentine, silica stone powder, vermiculite, shirasu balloon, glass balloon, silica, pearlite, sand, and beads are used.

The agent (6) prevents the wood material from inhibiting the curing. This drug (6) is shown in FIG.
As shown in FIG. 2 and FIG. 2, it is attached to the surface of the wood-based material before being added to the hydraulic material (1). Examples of the agent (6) include a hardening accelerator that accelerates hardening of cement components such as calcium chloride solution and magnesium sulfate solution, higher fatty acid such as stearic acid, water repellent such as coconut oil and beef tallow, and silicone. Although oil or the like is used, various other materials can be used as long as they can prevent curing inhibition.

According to the present invention, by adopting such a production method, a chemical agent (6) for preventing hardening inhibition by a wood material is attached to the surface of the wood material before it is added to the hydraulic material (1). Therefore, it is possible to sufficiently avoid the inhibition of hardening, it is possible to perform a hydration reaction in the hardening process by hydration of cement, especially even when the water content is small as in the dry method. It is possible to make it difficult to cause curing inhibition. As a result, it can be cured at a high temperature, and even if it is cured for a short time, the required strength can be exhibited and the productivity can be greatly improved.

That is, the present invention is simple,
It is possible to develop strength early without inhibiting the hydration reaction of cement.

Moreover, since the drug (6) is attached before it is added to the hydraulic material (1), it is not necessary to defibrate and dry it even when it is adopted in the dry method, and the process is It doesn't get complicated.

Further, as shown in FIG. 1, when the fiber material (2) among the wood materials is dry-defibrated, the chemical agent (6) is attached to the fiber material (2) by spraying. If it is a thing, the chemical | medical agent (6) can be reliably made to adhere to the surface of a fiber material (2) by spraying,
As a result, the strength can be surely and early expressed without impairing the hydration reaction of the cement, though it is simpler.

Further, as shown in FIG. 2, among the above woody materials, the chemical agent (6) is added after the dry defibration of the fiber material (2) and before the addition to the hydraulic material (1). When it is attached to the fiber material (2) by a gas phase reaction, the drug (6) can be surely attached to the surface of the fiber material (2) by the gas phase reaction,
As a result, the strength can be surely and early expressed without impairing the hydration reaction of the cement, though it is simpler.

In addition, chlorine gas and sulfurous acid gas are not generated during curing as in the conventional case, and the raw plate-like inorganic plate is not corroded.

In the case shown in FIG. 2, if the drug (6) is a higher fatty acid, the higher fatty acid causes the fiber material (2).
The higher fatty acid adheres to the surface of the product in a state close to that of a monomolecular film to impart waterproofness, and it is possible to prevent the deterioration of the reinforcing effect due to water absorption, and at the same time, it is possible to prevent the dissolution of the curing inhibiting component, The strength can be more surely and early expressed without inhibiting the hydration reaction.

When the added amount of the above-mentioned chemical agent (6) is 0.5 to 10.0 wt% with respect to the cement content, the chemical agent (6) acts effectively at this added amount, and the cement The strength can be more surely and early expressed without inhibiting the hydration reaction.

If the addition amount of the above-mentioned chemical agent (6) is less than 0.5 wt% with respect to the cement content, the addition amount of the above-mentioned chemical agent (6) is too small and it is difficult to surely obtain a sufficient effect. As a result, the hydration reaction of cement is likely to be hindered, and it becomes difficult to develop strength early.

If the amount of the above-mentioned agent (6) added is more than 10.0 wt% with respect to the cement content, the hydration reaction of the cement will not be sufficiently inhibited, but
During curing, chlorine gas or sulfurous acid gas, which is a component contained in the drug (6), is likely to be generated to cause corrosion of the raw plate-like inorganic plate, and the physical properties of the obtained inorganic plate are also
It may have a bad influence.

As shown in FIGS. 1 and 2, the inorganic plate of the present invention is an inorganic plate obtained by adding a wood material to a hydraulic material (1) containing cement as a main component, wherein the hydraulic material (1) is used. Before addition to the above, the chemical agent (6) for preventing the inhibition of curing by the wood material is attached to the surface of the wood material.

According to the present invention, by adopting such a constitution, before the addition to the hydraulic material (1), the chemical agent (6) for preventing the hardening inhibition by the wood material is attached to the surface of the wood material. Therefore, it is possible to sufficiently avoid the inhibition of hardening, and it is possible to carry out a hydration reaction in the hardening process by hydration of cement, especially when the water content is small as in the dry method. However, it is possible to make it difficult to cause curing inhibition. As a result, it can be cured at a high temperature, and even if it is cured for a short time, the required strength can be exhibited and the productivity can be greatly improved.

That is, the present invention is simple,
It is possible to develop strength early without inhibiting the hydration reaction of cement.

Moreover, since the chemical (6) is attached before it is added to the hydraulic material (1), it is not necessary to defibrate and dry even when it is adopted in the dry method, and the process is It doesn't get complicated.

[0035]

Examples of the present invention will be described below.

Example 1 As shown in FIG. 1, pulp (LUKP, hardwood unbleached sulfate pulp) was used as the fiber material (2), and while dry defibrating with a hammer mill (5), the chemical (6) 1 wt% calcium chloride (CaCl ₂ ) solution, which is one of the above, is 2.0 wt% with respect to the cement content (10.
0 wt%) was added. Next, 20 parts by weight of this pulp dry defibrated product, 100 parts by weight of Portland cement and 100 parts by weight of fly ash as a hydraulic material (1).
Parts by weight, 100 parts by weight of granulated blast furnace slag, and 100 parts by weight of water were prepared and mixed with an Erich mixer (3) to prepare a mixed material (4).

Then, the mixed material (4) is added to 300 mm.
It is filled in a mold of × 300 mm, sandwiched between upper and lower 2 mm iron plates, press-molded at a pressure of 6 MPa, brought into a tightly bound state with a fastening jig, and cured at 40 ° C. for 8 hours, and then the tightly bound state is released. Furthermore, it was possible to obtain an inorganic plate having a specific gravity of 1.45 by further performing heat and humidity curing at 75 ° C. for 3 days. This inorganic plate had been sufficiently cured when the tightly bound state was released.

This inorganic plate was dried at 60 ° C. for 24 hours, cut into a JIS No. 5 size sample, and the bending strength was measured. As a result, the bending strength was 1.
It was 6 MPa.

Example 2 As a drug (6), 1 wt% of magnesium sulfate (Mg)
Except that the SO ₄ ) solution was used,
An inorganic plate having a specific gravity of 1.44 could be obtained. This inorganic plate had been sufficiently cured when the tightly bound state was released.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.5M
Pa.

Example 3 Except that silicone oil was used as the drug (6),
In the same manner as in Example 1, an inorganic plate having a specific gravity of 1.45 could be obtained. This inorganic plate had been sufficiently cured when the tightly bound state was released.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.6M
Pa.

Comparative Example 1 As shown in FIG. 3, the same procedure as in Example 1 was carried out except that the chemical agent (6) was mixed with the fiber material (2) and the hydraulic material (1) in the Erich mixer (3). It was possible to obtain an inorganic plate having a specific gravity of 1.40. In addition, this inorganic plate,
When the tightly bound state was released, the curing was insufficient.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.2M
Pa.

Comparative Example 2 As shown in FIG. 3, a 1 wt% magnesium sulfate (MgSO ₄ ) solution was used as the chemical (6), and the chemical (6) was used together with the fiber material (2) and the hydraulic material (1). ,
Example 1 except mixing in an Erich mixer (3)
In the same manner as described above, an inorganic plate having a specific gravity of 1.39 could be obtained. The inorganic plate was insufficiently cured when the tightly bound state was released.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.1M
Pa.

Comparative Example 3 As shown in FIG. 3, silicone oil was used as the chemical (6), and the chemical (6) was used together with the fiber material (2) and the hydraulic material (1) in the Erich mixer (3). An inorganic plate having a specific gravity of 1.39 could be obtained in the same manner as in Example 1 except for mixing. The inorganic plate was insufficiently cured when the tightly bound state was released.

This inorganic plate was produced in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.2M
Pa.

Comparative Example 4 An inorganic plate having a specific gravity of 1.35 could be obtained in the same manner as in Example 1 except that the chemical agent (6) was not used. The inorganic plate was not sufficiently cured.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 0.8M
Pa.

In Table 1 below, Examples 1 to 3 and Comparative Examples 1 to 4 are shown.
The specific gravity and the bending strength of the inorganic plate obtained in 1. were summarized.

[0052]

[Table 1]

As can be seen by comparing Table 1 with those of Examples 1 to 3 and Comparative Examples 1 to 4 together with the above, the bending strengths of Examples 1 to 3 are found. The materials are much stronger than those of Comparative Examples 1 to 4, and by attaching the drug (6) to the surface of the wood material as in Examples 1 to 3, curing inhibition can be sufficiently avoided. The hydration reaction can be performed in the hardening process by hydration of cement, and in particular, even when the water content is small as in the dry method, it is possible to make it difficult to cause hardening inhibition. . As a result, it can be said that the composition can be cured at a high temperature, the required strength can be expressed even if it is cured for a short time, and the productivity can be greatly improved.

Example 4 As shown in FIG. 2, pulp (NUKP, unbleached softwood sulfate pulp) was used as the fiber material (2), and after dry defibration with a hammer mill (5), the fibers were further crushed with a crusher. The stearic acid, which is one of the chemicals (6), is added to 200 m before the disintegrated fiber is added to the hydraulic material (1).
Heating to 300 ° C. under reduced pressure of mHg, and contacting the fiber material (2) for 30 minutes in a vaporized atmosphere,
The drug (6) was attached by a gas phase reaction. Next, 18 parts by weight of this pulp dry defibrated product, and 100 parts by weight of Portland cement, 100 parts by weight of fly ash, 100 parts by weight of granulated blast furnace slag, and 75 parts of water as a hydraulic material (1).
Part by weight was prepared and mixed with an Erich mixer (3) to prepare a mixed material (4).

After this, the mixed material (4) is added to 300 mm.
After being filled in a mold of × 300 mm, press-molded at a pressure of 10 MPa for a time of 20 seconds, and then demolded, cured at 40 ° C. for 6 hours, and further cured at 80 ° C. for 70 hours.
After drying at 60 ° C. for 6 hours, an inorganic plate having a specific gravity of 1.40 could be obtained.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.5M
Pa. In addition, retention rate (water absorption bending strength retention rate),
When the water absorption rate was also measured, the retention rate was 65% and the water absorption rate was 28%.

Example 5 An inorganic plate having a specific gravity of 1.42 could be obtained in the same manner as in Example 4 except that beef tallow was used as the drug (6).

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.6M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 67% and the water absorption rate was 26%.

Example 6 An inorganic plate having a specific gravity of 1.33 could be obtained in the same manner as in Example 4 except that wood fiber was used as the fiber material (2).

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.3M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 60% and the water absorption rate was 35%.

Example 7 14.4 parts by weight of pulp dry defibrated product and hydraulic material (1)
As an example, 100 parts by weight of Portland cement, 100 parts by weight of fly ash, 40 parts by weight of silica stone, and 60 parts by weight of water are prepared, mixed with an Eirich mixer (3), and cured at 80 ° C. for 8 hours after press molding. And then,
175 ℃ in autoclave, 6 hours curing, 60 ℃,
An inorganic plate having a specific gravity of 1.43 could be obtained in the same manner as in Example 4, except that the plate was dried for 4 hours.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.7M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 65% and the water absorption rate was 27%.

Example 8 Beef tallow was used as the drug (6), and 14.4 parts by weight of the pulp dry defibrated product, and 100 parts by weight of Portland cement and fly ash 100 as the hydraulic material (1).
Prepare 40 parts by weight of silica stone powder, 60 parts by weight of water,
After mixing with an Erich mixer (3) and press-molding, after curing at 80 ° C. for 8 hours, further curing in an autoclave at 175 ° C. for 6 hours, drying at 60 ° C. for 4 hours Has a specific gravity of 1.4 in the same manner as in Example 4.
An inorganic plate of No. 4 could be obtained.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.7M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 65% and the water absorption rate was 27%.

Example 9 Wood fiber was used as the fiber material (2), and 14.4 parts by weight of the pulp dry defibrated product and 100 parts by weight of Portland cement and 100 parts by weight of fly ash were used as the hydraulic material (1). 40 parts by weight of silica powder and 60 parts by weight of water were prepared, mixed with an Erich mixer (3), and after press molding, cured at 80 ° C. for 8 hours, and further, in an autoclave at 175 ° C. for 6 hours. An inorganic plate having a specific gravity of 1.35 could be obtained in the same manner as in Example 4 except that the curing and the drying at 60 ° C. for 4 hours were performed.

This inorganic plate was prepared as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.1M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 60% and the water absorption rate was 36%.

Example 10 24 parts by weight of pulp dry defibrated product, 100 parts by weight of Portland cement, 100 parts by weight of fly ash, 100 parts by weight of granulated blast furnace slag, 100 parts by weight of vermiculite as hydraulic material (1), Prepare 100 parts by weight of water,
Example 4 except mixing in an Erich mixer (3)
In the same manner as described above, an inorganic plate having a specific gravity of 1.10 could be obtained.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.0M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 60% and the water absorption rate was 45%.

Example 11 Wood fiber was used as the fiber material (2), and 24 parts by weight of the pulp dry defibrated product and 100 parts by weight of Portland cement and fly ash 10 as the hydraulic material (1) were used.
0 parts by weight, 100 parts by weight of granulated blast furnace slag, 100 parts by weight of vermiculite, 100 parts by weight of water were prepared and mixed in the same manner as in Example 4 except that the specific gravity was 0. An inorganic plate of 0.98 could be obtained.

This inorganic plate was prepared in the same manner as in Example 1,
Flexural strength was measured. As a result, bending strength is 1.0M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 57% and the water absorption rate was 50%.

Example 12 19.2 parts by weight of pulp dry defibrated product and hydraulic material (1)
As 100 parts by weight of Portland cement, 100 parts by weight of fly ash, 40 parts by weight of granulated blast furnace slag, 80 parts by weight of vermiculite, and 80 parts by weight of water, they are mixed with an Eirich mixer (3) and pressed. After molding, after aging at 80 ° C. for 8 hours, further aging at 175 ° C. for 6 hours in an autoclave and drying at 60 ° C. for 4 hours were performed in the same manner as in Example 4 to obtain a specific gravity of 1 .1
2 was obtained.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.1M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 60% and the water absorption rate was 45%.

Comparative Example 5 An inorganic plate having a specific gravity of 1.33 could be obtained in an uncured state in the same manner as in Example 4 except that the chemical agent (6) was not used.

Since this inorganic plate was uncured, the flexural strength, retention rate and water absorption rate could not be measured.

Comparative Example 6 The procedure of Example 4 was repeated except that the wood fiber was used as the fiber material (2) and the chemical agent (6) was not used.
An inorganic plate having a specific gravity of 1.20 could be obtained in an uncured state.

Since this inorganic plate was uncured, the flexural strength, retention rate and water absorption rate could not be measured.

Comparative Example 7 14.4 parts by weight of a pulp dry defibrated product without using the chemical agent (6) and 100 parts by weight of Portland cement, 100 parts by weight of fly ash, and 40 parts by weight of silica stone powder as the hydraulic material (1). , 60 parts by weight of water were prepared, mixed with an Erich mixer (3), and after press molding, cured at 80 ° C. for 8 hours, and further, at 175 ° C. in an autoclave,
An inorganic plate having a specific gravity of 1.30 could be obtained in the same manner as in Example 4 except that curing was carried out for 6 hours, drying was carried out at 60 ° C. for 4 hours.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 1.0M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 50% and the water absorption rate was 38%.

Comparative Example 8 Wood fiber was used as the fiber material (2) without using the chemical agent (6), and 14.4 parts by weight of the pulp dry defibrated product,
As a hydraulic material (1), Portland cement 100
By weight, 100 parts by weight of fly ash, 40 parts by weight of silica stone, and 60 parts by weight of water were prepared and mixed by an Erich mixer (3), and after press molding, after curing at 80 ° C. for 8 hours, further, 175 ° C, 6 in autoclave
Except that it was cured for 60 hours, dried at 60 ° C for 4 hours,
In the same manner as in Example 4, an inorganic plate having a specific gravity of 1.25 could be obtained.

This inorganic plate was prepared in the same manner as in Example 1.
Flexural strength was measured. As a result, bending strength is 0.8M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 40% and the water absorption rate was 42%.

Comparative Example 9 24 parts by weight of a dry pulp defibrated product and Portland cement 1 as a hydraulic material (1) were used without using the chemical agent (6).
00 parts by weight, fly ash 100 parts by weight, granulated blast furnace slag 100 parts by weight, vermiculite 100 parts by weight,
A specific gravity of 1.05 was obtained in the same manner as in Example 4 except that 100 parts by weight of water was prepared and mixed with the Erich mixer (3).
Could be obtained in an uncured state.

Since this inorganic plate was uncured, the flexural strength, retention rate and water absorption rate could not be measured.

Comparative Example 10 Wood fiber was used as the fiber material (2) without using the chemical agent (6), and 24 parts by weight of the pulp dry defibrated product and 100 parts by weight of Portland cement as the hydraulic material (1) were used. , Fly ash 100 parts by weight, granulated blast furnace slag 10
0 part by weight, vermiculite 100 parts by weight, water 100
An inorganic plate having a specific gravity of 0.95 could be obtained in an uncured state in the same manner as in Example 4 except that parts by weight were prepared and mixed by the Erich mixer (3).

Since this inorganic plate was uncured, the bending strength, the retention rate and the water absorption rate could not be measured.

Comparative Example 11 19.2 parts by weight of a pulp dry defibrated product without using the chemical agent (6), 100 parts by weight of Portland cement, 100 parts by weight of fly ash and 40 parts of granulated blast furnace slag 40 as the hydraulic material (1). 1 part by weight, 80 parts by weight of vermiculite, and 80 parts by weight of water were prepared and mixed by an Erich mixer (3), and after press molding, after curing at 80 ° C. for 8 hours,
Furthermore, curing at 175 ° C for 6 hours in an autoclave,
An inorganic plate having a specific gravity of 1.10 could be obtained in the same manner as in Example 4 except that the plate was dried at 60 ° C. for 4 hours.

This inorganic plate was prepared as in Example 1.
Flexural strength was measured. As a result, the bending strength is 0.6M
Pa. In addition, in the same manner as in Example 4, the retention rate,
When the water absorption rate was also measured, the retention rate was 40% and the water absorption rate was 51%.

In Table 2 below, Examples 4 to 12 and Comparative Examples 5 to 5 are shown.
The specific gravity, bending strength, retention rate, and water absorption rate of the inorganic plate obtained in No. 11 are summarized.

[0088]

[Table 2]

As can be seen from Table 2 by comparing Table 1 with Examples 4 to 12 and Comparative Examples 5 to 11, the bending strengths of Examples 4 to 12 are shown. The materials are much stronger than those of Comparative Examples 5 to 11, and by adhering the drug (6) to the surface of the wood-based material as in Examples 4 to 12, it is possible to sufficiently avoid curing inhibition. The hydration reaction can be performed in the hardening process by hydration of cement, and in particular, even when the water content is small as in the dry method, it is possible to make it difficult to cause hardening inhibition. . As a result, it can be said that the composition can be cured at a high temperature, the required strength can be expressed even if it is cured for a short time, and the productivity can be greatly improved.

[0090]

According to the method for producing an inorganic plate according to claim 1 of the present invention, before addition to the hydraulic material (1),
Since the agent (6) for preventing the hardening inhibition by the wood material is attached to the surface of the wood material, the hardening inhibition can be sufficiently avoided, and the hydration reaction can be performed in the hardening process due to the hydration of cement. In particular, even when the water content is small as in the dry method, it is possible to make it difficult to cause curing inhibition. As a result, it can be cured at a high temperature, and even if it is cured for a short time, the required strength can be exhibited and the productivity can be greatly improved.

That is, the present invention is simple,
It is possible to develop strength early without inhibiting the hydration reaction of cement.

Moreover, since the chemical (6) is attached before it is added to the hydraulic material (1), it is not necessary to defibrate and dry even when the chemical method (6) is adopted in the dry method. It doesn't get complicated.

According to the method for producing an inorganic plate according to claim 2 of the present invention, in addition to the case of claim 1, the chemical agent (6) is surely attached to the surface of the fiber material (2) by spraying. As a result, the strength can be surely and early expressed without impeding the hydration reaction of the cement while being simpler.

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, the chemical substance (6) is surely attached to the surface of the fiber material (2) by a gas phase reaction. As a result, the strength can be surely and early expressed without impairing the hydration reaction of the cement, as a result of being even simpler.

In addition, chlorine gas and sulfurous acid gas are not generated during curing as in the conventional case, and the raw plate-like inorganic plate is not corroded.

According to the method for producing an inorganic plate according to claim 4 of the present invention, in addition to the case of claim 3, the higher fatty acid is added to the surface of the fiber material (2) in a state similar to that of a monomolecular film. A fatty acid is attached to provide waterproofness, and it is possible to prevent a decrease in the reinforcing effect due to water absorption, and it is possible to prevent the hardening inhibiting component from being dissolved and to more reliably prevent the hydration reaction of the cement. In addition, the strength can be developed early.

According to the method for producing an inorganic plate according to claim 5 of the present invention, in addition to the case of any one of claims 1 to 4, the drug (6) effectively acts at this addition amount. As a result, the strength can be expressed more reliably and early without inhibiting the hydration reaction of cement.

According to the inorganic plate of claim 6 of the present invention, before the addition to the hydraulic material (1), a chemical agent (6) for preventing hardening inhibition by the wood material is attached to the surface of the wood material. Therefore, it is possible to sufficiently avoid the inhibition of hardening, and it is possible to carry out a hydration reaction in the hardening process by hydration of cement, especially when the water content is small as in the dry method. However, it is possible to make it difficult to cause curing inhibition. As a result, it can be cured at a high temperature, and even if it is cured for a short time, the required strength can be exhibited and the productivity can be greatly improved.

That is, the present invention is simple,
It is possible to develop strength early without inhibiting the hydration reaction of cement.

Moreover, since the chemical agent (6) is attached before it is added to the hydraulic material (1), it is not necessary to defibrate and dry it even when it is adopted in the dry method, and the process is It doesn't get complicated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a method for manufacturing an inorganic plate according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an outline of a method for manufacturing an inorganic plate according to another embodiment of the present invention.

FIG. 3 is a block diagram showing an outline of a method for manufacturing an inorganic plate according to a conventional example.

[Explanation of symbols]

 1 Hydraulic Material 2 Fiber Material 3 Eichrich Mixer 4 Mixed Material 5 Hammer Mill 6 Chemicals

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Claims (6)

[Claims] 1. In a method for producing an inorganic plate in which a wood material is added to a hydraulic material containing cement as a main component, an agent for preventing hardening inhibition by the wood material is added before the addition to the hydraulic material. A method for producing an inorganic plate, which comprises adhering to a surface of a wood material. 2. The method for producing an inorganic plate according to claim 1, wherein the chemical is applied to the fiber material by spraying during dry defibration among the wood materials. . 3. The wood material is characterized in that the chemical is adhered to the fiber material by a gas phase reaction after dry defibration of the fiber material and before addition to the hydraulic material. The method for producing an inorganic plate according to claim 1. 4. The method for producing an inorganic plate according to claim 3, wherein the drug is a higher fatty acid. 5. The method for producing an inorganic plate according to claim 1, wherein the amount of the chemical agent added is 0.5 to 10.0 wt% with respect to the cement content. 6. In an inorganic board made by adding a wood material to a hydraulic material containing cement as a main component, an agent for preventing hardening inhibition by the wood material is added to the wood material before the addition to the hydraulic material. An inorganic plate characterized by being adhered to the surface of a material.