JPH09136315A - Fabrication of inorganic plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve bending strength and surface finish of an inorg. plate by a method wherein a mixing water is prepd. by mixing water and β-1,3-glucan and a molding material is prepd. by mixing this mixing water and a hydraulic material mixture wherein cement is a main ingredient and molding is performed. SOLUTION: A mixing water is prepd. by compounding water mixed with a water reducing agent with β-1,3-glucan. Then, this mixing water is compounded with a mixture of a hydraulic material and a molding material 1 is prepd. by mixing the mixture by means of a mixer for cement product such as an omni-mixer. Then, the molding material 1 is fed into a cavity 7 and a male mold 3 is lowered and a core 4 is fitted in a cavity 7 of a female mold 6 and the molding material 1 is molded by compression and at the same time, dehydrating action is applied on the molding material 1 by vacuum suction from a drainage hole 8 and then, the molding material 1 is cured by aging in the mold 2 to prepare 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 used as a building exterior material such as a roofing material or an outer wall material, and is particularly applied to an inorganic board having a complicated shape. is there.

[0002]

2. Description of the Related Art Conventionally, cement, an aggregate, a reinforcing fiber and a thickener are mixed and mixed, and water is added to the mixture to knead to prepare a molding material, which is then press-molded or extruded. It is performed to mold an inorganic plate by a molding method. The above-mentioned thickening agent is added to the molding material in order to prevent the separation of the cement and the aggregate or the separation of the cement and the reinforcing fiber, and to ensure the fluidity of the molding material, cellulose ether. Many types (methyl celluloses) are used.

However, with the cellulose ether-based thickener, the dispersibility of the reinforcing fibers in the molding material cannot be increased, the bending strength of the inorganic plate is low, and cracks occur on the surface of the inorganic plate. There was a problem that the surface texture became poor. Therefore, it has been proposed to use β-1,3 glucan as a thickener.

[0004]

However, aggregates, reinforcing fibers, and β-1,3 glucan as a thickener are mixed and mixed in cement, and water is added to this to knead to prepare a molding material. However, compared with the case of using a cellulose ether-based thickener, it is not possible to increase the dispersibility of the reinforcing fibers in the molding material so much, and it is possible to improve the bending strength and surface texture of the inorganic plate too much. There was a problem that I could not.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for manufacturing an inorganic plate which can greatly improve the bending strength and surface texture of the inorganic plate.

[0006]

The method for producing an inorganic plate according to claim 1 of the present invention comprises mixing water and β-1,3 glucan to prepare kneading water, and then mixing the kneading water with the water. It is characterized in that a molding material is prepared by kneading with a hydraulic material mixture containing cement as a main component, and then this molding material is molded.

According to a second aspect of the present invention, in the method for producing an inorganic plate, water, β-1,3 glucan and reinforcing fibers are mixed to prepare kneading water, and then this kneading water and cement are mixed. It is characterized in that a molding material is prepared by mixing with a hydraulic material mixture as a main component, and then this molding material is molded. The method for producing an inorganic plate according to claim 3 of the present invention is the method of preliminarily kneading with the kneading water of claim 1 or 2 and a hydraulic material mixture containing cement as a main component, and further adding water to the mixture. The method is characterized in that a molding material is prepared by, and then this molding material is molded.

[0008]

Embodiments of the present invention will be described below. First, an embodiment of the invention described in claim 1 of the present invention will be described. β-1,3 glucan is disclosed in JP-A-4-3.
As described in 67550, glucose is a polysaccharide in which glucose is mainly bound by β-1,3 bonds, and in the present invention, this β-1,3 glucan is used as a thickener. In other words, by including β-1,3 glucan in the molding material, it is possible to prevent the separation of cement and aggregate or the separation of cement and reinforcing fiber,
In addition, it is possible to secure the fluidity of the molding material, and it is better to remove the foaming property of the molding material, the dehydration property of the molding material at the time of molding, and the shape retention than the case of using a cellulose ether-based thickening agent. It is possible to improve the moldability such as the adhesiveness and the mold adhesion.

Further, β-1,3 glucan has a solid content of 0.1% with respect to the solid content composed of cement, fly ash, reinforcing fiber and the like.
It is preferable to mix it in a proportion of 03 to 0.3% by weight.
If the content of β-1,3 glucan is less than 0.03% by weight, the effect of preventing the separation of cement and aggregate or the separation of cement and reinforcing fiber or securing the fluidity of molding material is exhibited. Cannot be made, and β-1,3
Even if the blended amount of glucan exceeds 0.3% by weight, there is no great change in the fluidity of the molding material, which is economically disadvantageous.

The hydraulic material mixture in this embodiment is formed by mixing cement and reinforcing fibers. As the cement, ordinary Portland cement, early-strength Portland cement, moderate heat Portland cement, fly ash cement, blast furnace cement and the like can be used. As the reinforcing fiber, an organic fiber such as polyvinyl alcohol fiber (vinylon), polypropylene fiber, acrylic fiber or aramid fiber can be used. Each of these reinforcing fibers can be used alone, but in order to increase the bending strength and impact strength of the inorganic plate, it is preferable to use two or more of the above fibers in combination, for example, a tensile strength of 10 g / denier or more. High tensile strength fibers (polyvinyl alcohol fiber and acrylic fiber) and tensile elongation of 20%
The above polypropylene fibers can be used together.

The fiber length of the reinforcing fibers is preferably 3 to 8 mm. If the fiber length is less than 3 mm, the strength of the inorganic plate cannot be increased, and if the fiber length exceeds 8 mm, the fibers are separated from each other. The entanglement becomes large and the fluidity of the molding material becomes low, which may reduce the moldability. Further, the reinforcing fiber is preferably blended in a proportion of 1 to 5% by weight based on the solid content of cement and fly ash, etc. If the blending amount is less than 1% by weight, the strength of the inorganic plate can be increased. In addition, if the compounding amount exceeds 5% by weight, the fluidity of the molding material becomes low and the moldability may be deteriorated.

If necessary, the hydraulic material mixture may also include
It is preferable to mix and mix at least one or more of aggregate components such as limestone powder, silica powder and calcium carbonate powder, and pozzolanic reaction materials such as silica fume, fly ash and diatomaceous earth. In particular, when silica such as silica powder or silica fume is contained in the molding material, the dispersibility of the reinforcing fibers in the molding material is improved, and the kneading time of the molding material can be shortened.

Next, the preparation of the molding material in this embodiment will be described. First, water and a water reducing agent are mixed. The water-reducing agent can improve the fluidity of the molding material even if the molding material is prepared with a small amount of water, and thus the surplus water of the molding material at the time of molding can be reduced. As the water reducing agent, for example, a naphthalene sulfonic acid type such as a naphthalene sulfonic acid formalin high condensate, or a lignin sulfonic acid type such as a sulfonated melamine formalin condensate, or a polyoxycarboxylic acid type is used. be able to. Further, the amount of the water reducing agent can be set to 0.5% by weight or less with respect to the cement component or the total amount of the cement component and the pozzolanic reaction material (pozzolan component). The amount of water reducing agent is 5
When the content exceeds the weight%, the curing of the molding material 1 may be delayed and the productivity may be lowered. The lower limit of the amount of the water reducing agent is not particularly limited, but it is preferable to add the water reducing agent in an amount of 0.1% by weight or more relative to the cement in order to obtain the water reducing effect.

Next, β-1,3 glucan is mixed and mixed with water mixed with a water reducing agent to prepare kneading water. Next, this kneading water can be blended with the above hydraulic material mixture and mixed and kneaded with a cement product mixer such as an omni mixer, an Eirich mixer or a kneader to prepare a molding material.
In this embodiment, water and β-1,3 glucan are mixed in advance before blending the hydraulic material mixture to prepare kneading water, and then the hydraulic material mixture is blended in the kneading water. Since they are mixed, the dispersibility of the reinforcing fibers in the molding material can be improved more than when using a methylcellulose-based thickener as the thickener, and the β-1,3 glucan and the hydraulic material mixture are mixed first. After that, the dispersibility of β-1,3 glucan and reinforcing fibers in the molding material can be increased and the kneading time of the molding material can be shortened compared with the case where water is added to this to prepare the molding material. As a result, the productivity can be enhanced and the bending strength of the inorganic plate can be enhanced.

Next, a method of molding the above molding material will be described. The molding material 1 can be molded by an arbitrary method such as a press molding method or an extrusion molding method. For example, the molding material 1 can be press molded using a mold 2 as shown in FIG. The male die 3 of the die 2 is formed by providing a core 4 having a sharp bottom surface, and an elastic body 5 made of NBR or the like is provided around the core 4. The female die 6 of the die 2 has a cavity 7 whose bottom surface is formed in a substantially V shape. Further, the female die 6 is provided with a plurality of drainage holes 8 which are open to the bottom surface and the bottom surface of the cavity 7.

Then, as shown in FIG. 1 (a), the molding material 1 is supplied to the cavity 7, the male die 3 is moved downward, and the core 4 is fitted into the cavity 7 of the female die 6 and then, as shown in FIG. b)
As shown in FIG. 3, the molding material 1 is compressed and molded, and at the same time, the molding material 1 is dehydrated by vacuum suction from the drain hole 8, and then the molding material 1 is cured and hardened in the mold 2. As a result, an inorganic plate (the roof tile in FIG. 1) can be manufactured.

Next, an embodiment of the invention according to claim 2 of the present invention will be described. The hydraulic material mixture in this embodiment is formed by removing the reinforcing fibers in the above-mentioned embodiment, that is, the cement and the aggregate and the pozzolanic reaction material which are blended as necessary. Then, the molding material in this embodiment can be prepared as follows. First, water and a water reducing agent are mixed in the same manner as in the above embodiment. Next, β-1,3 glucan and the reinforcing fibers similar to those in the above-described examples are mixed and mixed with water mixed with the water reducing agent to prepare kneading water. Next, this kneading water can be mixed with the hydraulic material mixture of this embodiment and mixed and kneaded in the same manner as in the above embodiment to prepare a molding material.

In this embodiment, water, β-1,3 glucan and reinforcing fibers are mixed in advance before blending the hydraulic material mixture to prepare kneading water, and then the hydraulic material is added to the kneading water. Since the mixture is mixed and mixed, the dispersibility of the reinforcing fibers in the molding material can be increased as compared with the molding material of the above embodiment, and the kneading time of the molding material can be shortened as compared with the above embodiment. In addition, the bending strength of the inorganic plate can be improved.

The molding material in this embodiment can be molded in the same manner as in the above-mentioned embodiment. Next, an embodiment of the invention according to claim 3 of the present invention will be described. In this embodiment, in the embodiment of the invention of claim 1 or the embodiment of the invention of claim 2, β-1,3 glucan is used as a part of the water finally blended as primary water. Alternatively, β-1,3 glucan and reinforcing fibers are mixed to prepare kneading water, and this kneading water is blended with a hydraulic material mixture and preliminarily kneaded, and then the remaining water is preliminarily kneaded as secondary water. In addition to the above, the main kneading was performed to prepare a molding material.

In this embodiment, the kneading water is prepared with a part of the water to be finally blended, and then the hydraulic material mixture is blended into the kneading water and premixed. The dispersibility of the reinforcing fiber in the molding material can be improved more than that of the material, and the bending strength of the inorganic plate can be improved more than in the above-mentioned embodiment.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples. (Example 1) Cement and fly ash as the component (A), vinylon as the component (B) and taflight (polypropylene fiber manufactured by Sun Kasei Co., Ltd.) were blended in the blending amounts shown in Table 1,
A hydraulic material mixture was prepared by mixing for 3 minutes using an omni mixer. Next, biopoly (Takeda Pharmaceutical Co., Ltd., P-3) as (C) component β-1,3 glucan is mixed with (D) component water containing a water reducing agent and mixed to prepare kneading water. did.

Next, kneading water was added to the hydraulic material mixture and kneaded with an omni mixer to prepare a molding material. Next, this molding material was dehydrated and press-molded using a press molding machine as shown in FIG. The dehydration condition is a pressing force of 9.8MP.
a, the holding time was 25 seconds. Next, this molded product was aged at a temperature of 40 ° C. and a humidity of 90% or more for 8 hours and then stored indoors for 7 days to obtain an inorganic plate.

Example 2 The same cement and fly ash as in Example 1 were compounded in the compounding amounts shown in Table 1 and mixed for 3 minutes using an omni mixer to prepare a hydraulic material mixture. Next, the same β-1,3 glucan, vinylon, and taffite as in Example 1 were mixed and mixed with water containing the same water reducing agent as in Example 1 to prepare kneading water. After that, an inorganic plate was obtained in the same manner as in Example 1.

(Example 3) Cement, fly ash, vinylon and taflite similar to those in Example 1 were mixed in the amounts shown in Table 1 and mixed for 3 minutes using an omni mixer to prepare a hydraulic material mixture. . Next, a water-reducing agent was blended with a part of the finally blended water as primary water, and the same β-1,3 glucan as in Example 1 was blended and mixed to prepare kneading water. Next, kneading water was added to the hydraulic material mixture and preliminarily kneaded for 3 minutes with an omni mixer, and then the remaining water was added as secondary water to the prekneaded substance and kneaded to prepare a molding material. After that, an inorganic plate was obtained in the same manner as in Example 1.

Example 4 The same cement, fly ash, vinylon, and taflite as in Example 1 and silica as the component (A) were mixed in the amounts shown in Table 1 and mixed for 3 minutes using an omni mixer. A hydraulic material mixture was prepared. Next, the same β-1,3 glucan as in Example 1 was mixed with water containing the same water reducing agent as in Example 1 and mixed to prepare kneading water. After that, an inorganic plate was obtained in the same manner as in Example 1.

Comparative Example 1 The same cement, fly ash, vinylon, and taflite as in Example 1, and the component (C), Metroses (High Metroses 4000, manufactured by Shin-Etsu Chemical Co., Ltd., methylcellulose) were used in the amounts shown in Table 1. Blend and mix for 6 minutes using an Omni mixer. Next, water obtained by blending this mixture with the same water reducing agent as in Example 1 was used.
A molding material was prepared by adding and kneading in the compounding amount shown in. After that, an inorganic plate was obtained in the same manner as in Example 1.

Comparative Example 2 An inorganic plate was obtained in the same manner as in Example 1 except that the same as in Comparative Example 1 was used instead of β-1,3 glucan in Example 1. (Comparative Example 3) Example 2 was repeated except that the same Metrolose as in Comparative Example 1 was used in place of the β-1,3 glucan of Example 2.
An inorganic plate was obtained in the same manner as in.

(Comparative Example 4) An inorganic plate was obtained in the same manner as in Comparative Example 1 except that the same β-1,3 glucan as in Example 1 was used in place of the metrolose of Comparative Example 1. In the above Examples 1 to 4 and Comparative Examples 1 to 4, the mixing and kneading time of the molding material and the dispersion state of the reinforcing fibers were observed. The bending strength and the Charpy impact strength of the inorganic plates obtained in Examples 1 to 4 and Comparative Examples 1 to 4 were measured, and the surface texture was observed. Table 1 shows the results.

The blending amount of the water reducing agent shown in Table 1 is based on the total amount of cement and fly ash. Moreover, the blending amount of water shown in Table 1 is based on the total amount of all solids. Further, in Table 1, ◯, Δ, and × indicate good, normal, and poor, respectively.

[0030]

[Table 1]

As can be seen by comparing Examples 1 to 4 with Comparative Examples 1 to 3, Example 1 using β-1,3 glucan was used.
Nos. 4 to 4 were able to satisfactorily disperse the reinforcing fibers even when the mixing and kneading time of the molding material was 3 to 6 minutes, whereas in Comparative Examples 1 to 3, the mixing and kneading time of the molding material was 9 Even after ~ 12 minutes, the reinforcing fibers could not be dispersed well. That is, in Examples 1 to 4 using β-1,3 glucan, the dispersibility of the reinforcing fiber can be made higher than that in Comparative Examples 1 to 3, and thus the inorganic plates of Examples 1 to 4 are more preferable. In comparison with Comparative Examples 1 to 3, the bending strength can be increased and the surface texture can be improved.

As can be seen by comparing Examples 1 to 4 with Comparative Example 4, in Examples 1 to 4 in which β-1,3 glucan was previously blended in water and mixed, the mixing and kneading time of the molding material was 3
Although the reinforcing fibers could be well dispersed even in ~ 6 minutes, in Comparative Example 4 in which the cement and the β-1,3 glucan were mixed, the mixing and kneading time of the molding material was set to 9 minutes.
Unless the length was increased, the reinforcing fibers could not be dispersed well. That is, Examples 1 to 4 in which β-1,3 glucan was previously mixed and mixed in water had higher dispersibility of the reinforcing fiber than those of Comparative Example 4 in which β-1,3 glucan was mixed with cement or the like. Therefore, the bending strength of the inorganic plates of Examples 1 to 4 can be higher than that of Comparative Example 4, and the surface texture can be improved.

When Example 1 and Example 2 are compared, Example 2 in which the reinforcing fiber is mixed with water shows that the reinforcing fiber is well dispersed even when the mixing and kneading time of the molding material is 3 minutes. On the other hand, in Example 1, the mixing and kneading time of the molding material was set to 6 minutes, whereby the reinforcing fibers could be well dispersed. That is, Example 2 in which the reinforcing fiber is mixed with water is more preferable than Example 1 in which the reinforcing fiber is mixed with cement or the like.
Dispersion of the reinforcing fibers could be carried out better than that of Example 1, and therefore, the bending strength of the inorganic plate of Example 2 was higher than that of Example 1.

Comparing Examples 1 and 3 with each other, it was found that in both cases, the mixing and kneading time of the molding material was 6 minutes, and the reinforcing fibers could be well dispersed. The inorganic plate of Example 3 was able to have higher bending strength. It is considered that this is because the dispersibility of the reinforcing fiber was higher in Example 3 in which water was divided into two parts than in Example 1 in which water was mixed in once.

Comparing Examples 1 and 4 with each other, both were able to disperse the reinforcing fibers satisfactorily with the mixing and kneading time of the molding material being 3 minutes. The inorganic plate of Example 3 was able to have higher bending strength. It is considered that this is because the dispersibility of the reinforcing fiber in Example 4 containing silica was higher than that in Example 1 containing no silica.

[0036]

As described above, according to the invention described in claim 1 of the present invention, water and β-1,3 glucan are mixed to prepare kneading water, and the kneading water and cement are the main components. A molding material was prepared by kneading with a hydraulic material mixture to be used, and then this molding material was molded, so that the dispersibility of reinforcing fibers can be increased, and the bending strength and surface texture of the inorganic plate can be increased. Is something that can be done.

According to the second aspect of the present invention, water, β-1,3 glucan and reinforcing fibers are mixed to prepare kneading water, and then this kneading water and cement are the main components. A molding material is prepared by mixing it with a hydraulic material mixture, and this molding material is then molded, so that the dispersibility of reinforcing fibers can be further increased and the bending strength of the inorganic plate can be increased. Is.

The invention according to claim 3 of the present invention preliminarily kneads the kneading water according to claim 1 or 2 and the hydraulic material mixture containing cement as a main component, and further kneads the mixture with water. Since the molding material is prepared and then this molding material is molded, the dispersibility of the reinforcing fibers can be further increased, and the bending strength of the inorganic plate can be increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of press molding of the present invention.

[Explanation of symbols]

 1 molding material

Claims (3)

[Claims] 1. Mixing water and β-1,3 glucan to prepare kneading water, and then kneading this kneading water and a hydraulic material mixture containing cement as a main component to prepare a molding material, Next, a method for producing an inorganic plate, which comprises molding this molding material. 2. A molding material by mixing water, β-1,3 glucan and reinforcing fibers to prepare kneading water, and then mixing the kneading water with a hydraulic material mixture containing cement as a main component. And then molding this molding material. 3. A molding material is prepared by pre-kneading the kneading water according to claim 1 and a hydraulic material mixture containing cement as a main component, and further adding water to the mixture to prepare a molding material. A method for producing an inorganic plate, which comprises molding.