JP2007302488A - Composition of inorganic plate material containing high specific gravity aggregate and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition of an inorganic plate material having excellent functionality such as magnetic attracting property, heat conductivity, electrical conductivity, electric wave absorptivity, electromagnetic adsorptivity and sound insulating property and excellent strength and made thinner than that of a conventional one. <P>SOLUTION: In the composition of the inorganic plate material consisting essentially of a hydraulic material and aggregate and containing an organic fiber, 15-80 pts.mass hydraulic material, 5-50 pts.mass aggregate having specific gravity of 1.0-<3.0 as low specific gravity aggregate, 10-76 pts.mass aggregate having specific gravity of 3.0-8.0 as high specific gravity aggregate and 4-10 pts.mass organic fiber are blended. The method of manufacturing the inorganic plate material is carried out by a round screen type paper making machine using the composition in which the aggregate having particle diameter adjusted to ≤150 μm as the high specific gravity aggregate and a cellulose fiber having beating degree adjusted to 100-300 CSF as the organic fiber are blended. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inorganic board using a high specific gravity raw material and a method for producing the same, and more particularly to an inorganic board using a high specific gravity raw material having functionality and a method for producing an inorganic board by papermaking the raw material. Is.

Conventionally, a high-strength product has been obtained by producing a high specific gravity inorganic plate. As a method of obtaining a high specific gravity inorganic plate, a method of pressing a molded body obtained by papermaking or the like to increase the specific gravity, a method of blending high specific gravity raw materials (such as aggregates) and manufacturing by extrusion molding or casting. Etc.
The main purpose of increasing the specific gravity of the conventional inorganic plate was to obtain a high-strength molded body as described above. Patent document 1 is mentioned as a prior art as high specific gravity of an inorganic board.

Patent Document 1 uses Cu-kα rays, Generator tension: 40 kV, Generator current: 30 mA, Divergence slit: 1 °, Receiving slit: 0.2 °, Stepsize: 0.050 ° 2θ, Time per step: When the powder X-ray diffraction is measured by a continuous method under the condition of 0.000 S, the broad peak area observed between 2θ = 20-40 ° is 150-400 [counts · °]. A hydraulic inorganic molded body having a specific gravity of 1.2 to 1.7 is described. According to the present invention, a hydraulic inorganic molded body having a large specific gravity, excellent strength, and good machinability is obtained. Thus, conventionally, the purpose of making the specific gravity of the inorganic board high is mainly to obtain a high-strength inorganic board.
In Patent Document 2, in the method for producing a cement board in the papermaking method, among the blends of cement, silica, additives, and reinforcing fibers, ultrafine silica sand is used as the silica, high beaten pulp as the reinforcing fiber, and 0. A method for producing a high-strength cement board by using a mixture of organic synthetic fibers of 2% by mass or less, adding water to the cement composition, and making a slurry with a solid concentration of 5 to 10% is described. . In this manufacturing method, after the green board wound up on the making roll after paper making is developed, it is pressed to improve the packing density and to increase the bond strength of the cement matrix by autoclave curing, thereby obtaining a high-strength cement board. .

On the other hand, as an inorganic board | plate material, it is calculated | required to provide various functions besides humidity control property, workability, etc. like the past. For example, there are functions such as thermal conductivity, conductivity, sound insulation, and magnet adhesion.
In order to obtain such a function, it is necessary to add a raw material for imparting a function during the production of the inorganic plate material. For example, in order to impart a magnet adhesion function to the inorganic plate itself, it is necessary to blend a magnetic material containing an alloy such as iron or nickel.

  Examples of a method for producing such an inorganic plate material include an extrusion molding method, a long mesh papermaking method, a round mesh papermaking method, and a casting method. In particular, in the round net-type papermaking method, a thin molded body of 3.0 to 10.0 mm can be continuously formed, so that it is frequently used as a manufacturing method of a building board as a thin and large-sized molded body. However, in the case of the round net type papermaking method, when such a heavy material is blended, the raw material having a high specific gravity is settled and cannot be finished. For this reason, conventionally, the round net type papermaking method could only produce paper having a specific gravity of about 1.0 to 3.0. For this reason, for example, in order to produce a board in which a magnetic material is blended, a raw material with high specific gravity such as iron or nickel or an alloy containing them cannot be blended. Therefore, in order to allow the magnet to adhere to the surface of the inorganic plate material, it is necessary to stick a magnetic sheet or the like on the surface of the inorganic plate material.

In Patent Document 2, a magnetic sheet is attached to the surface of an inorganic plate such as gypsum board, and the display material and wall are easily provided by the adsorption force of a magnet, which is necessary for a fire wall covering and has fire prevention performance and gas toxicity. A fireproof magnetic material capable of adhering or peeling a dressing or the like and a fireproof magnetic wall using the same are described. However, since such a magnetic sheet contains a resin, even if the gas hazard is taken into consideration, if the inorganic plate material to which the magnetic sheet is attached is exposed to a flame, some smoke is generated. Gas generation is inevitable.
JP 2000-63166 A JP-A-4-160046 JP 2005-290707 A

However, the technique of Patent Document 1 uses a silica having a specific gravity of about 2.3 as a raw material, and Patent Document 2 uses a papermaking method so that the specific gravity is as high as 3 to 8. It is not applicable when using aggregates with a specific gravity as raw materials, and has found a composition capable of producing an inorganic board when using such high specific gravity aggregates as raw materials, thereby providing high functionality. It has been desired to develop a method for producing an inorganic plate material.
The present invention solves the above-mentioned problems of the prior art and improves the functionality by increasing the specific gravity. In addition to increasing the strength of the conventional technology, the magnet adsorbability, thermal conductivity, conductivity, radio wave absorption, electromagnetic wave absorption It is an object of the present invention to provide an inorganic plate material that exhibits excellent performance, such as properties and sound insulation, and a method for producing the same.
In particular, even when a high specific gravity aggregate, which is difficult to manufacture by a round net-type papermaking method, is used, it is an object to provide an inorganic plate material having a thinner thickness by the manufacturing method.

The present invention has solved the above problems by the following means.
(1) In an inorganic board composition composed mainly of a hydraulic material and an aggregate, and blended with organic fibers, 15 to 80 parts by mass of the hydraulic material and a specific gravity of less than 1.0 to 3.0 as a low specific gravity aggregate 5 to 50 parts by mass of an aggregate, 10 to 76 parts by mass of an aggregate having a specific gravity of 3.0 to 8.0 as a high specific gravity aggregate, and 4 to 10 parts by mass of organic fibers are blended. object.
(2) The inorganic plate material composition according to (1), wherein an aggregate having a particle size adjusted to 150 μm or less is blended as the high specific gravity aggregate.
(3) The inorganic plate material composition as described in (1) or (2) above, wherein a fiber having a beating degree of cellulose fiber adjusted to 100 to 300 CSF is blended as the organic fiber.

(4) An inorganic plate material composition made mainly of hydraulic material, low specific gravity aggregate, and high specific gravity aggregate and blended with organic fibers, and adjusted to a particle size of 150 μm or less as high specific gravity aggregate The inorganic board | plate material composition which mix | blends the fiber which mix | blended the aggregate and adjusted the beating degree of the cellulose fiber to 100-300CSF as organic fiber.
(5) The inorganic plate material composition according to any one of (1) to (4), wherein the inorganic plate material composition is produced by a round net type paper machine.
(6) In the manufacturing method of the inorganic board material composition which forms the inorganic board | plate material by making the slurry which has a hydraulic material and an aggregate as a main component and mix | blended the organic fiber, 15-80 mass parts of hydraulic materials, low specific gravity bone 5 to 50 parts by mass of an aggregate having a specific gravity of 1.0 to less than 3.0, 10 to 76 parts by mass of an aggregate having a specific gravity of 3.0 to 8.0, and 4 to 10 parts by mass of an organic fiber. A method for producing an inorganic plate material, characterized in that the slurry obtained by blending is produced by making paper with a round netting machine.

  Since the inorganic plate material composition of the present invention can be made with a round net-type paper machine, it is possible to select a wide range of raw materials having a high specific gravity that has not been conventionally available. This makes it possible to obtain an inorganic plate material that is excellent in functionality such as magnet adsorption, thermal conductivity, electrical conductivity, radio wave absorption, electromagnetic wave absorption, and sound insulation, and that is thinner than before.

The present invention has 15 to 80 parts by mass of a hydraulic material, 5 to 50 parts by mass of an aggregate having a specific gravity of less than 1.0 to 3.0 as a low specific gravity aggregate, and a specific gravity of 3.0 to 8.0 as a high specific gravity aggregate. An inorganic plate material composition comprising 10 to 76 parts by mass of aggregate and 4 to 10 parts by mass of organic fiber, preferably an aggregate having a particle size adjusted to 150 μm or less as a high specific gravity aggregate. By blending and making an inorganic board material composition containing fibers adjusted to 100-300 CSF (Canadian Standard Freeness) as the organic fiber, the selection of a wide range of raw materials with high specific gravity is unprecedented. For example, raw materials having various functions can be blended, and an inorganic plate material excellent in magnet adhesion, thermal conductivity, conductivity, sound insulation and the like can be obtained.
Furthermore, 15-80 parts by mass of hydraulic material, 5-50 parts by mass of aggregate having a specific gravity of less than 1.0-3.0 as a low specific gravity aggregate, and an aggregate having a specific gravity of 3.0-8.0 as a high specific gravity aggregate. By blending 10 to 76 parts by mass and 4 to 10 parts by mass of organic fibers and producing them with a round net-making machine, it is excellent in thin and large sheet-like functionality taking advantage of the features of the round net-making machine. It is possible to obtain an inorganic plate material.

The inorganic plate material composition of the present invention is a hydraulic material, a low specific gravity aggregate having a specific gravity of 1.0 to less than 3.0, a high specific gravity aggregate having a specific gravity of 3.0 to 8.0, and an organic fiber.
As the hydraulic material, one or a mixture of two or more materials having hydraulic properties such as cement, gypsum, and steel slag can be used. As the low specific gravity aggregate having a specific gravity of 1.0 to less than 3.0, one or a mixture of two or more of quartz sand, wollastonite, calcium carbonate, aluminum and the like can be used. High specific gravity aggregates with a specific gravity of 3.0-8.0 include copper and iron for thermal conductivity and conductivity, ferrite and carbon for radio wave absorption and electromagnetic wave absorption, and sound insulation and magnet adsorption. Can use one of magnetite and iron. As the organic fiber, softwood pulp is used.
The blending amount of the hydraulic material is 20 to 80 parts by mass. However, if the hydraulic material is too small, the strength of the inorganic board is reduced. Since the function cannot be obtained, it is desirable to blend 30 to 50 parts by mass.

The amount of the aggregate having a specific gravity of 1.0 to less than 3.0 is 5 to 50 parts by mass as the low specific gravity aggregate, but 10 to 40 parts by mass based on the reactivity with cement and the amount of the high specific gravity aggregate. It is preferable to mix.
The amount of the aggregate having a specific gravity of 3.0 to 8.0 as the high specific gravity aggregate is 10 to 76 parts by mass. However, if the amount is too small, the desired function cannot be obtained. Therefore, it is preferable to mix 30 to 50 parts by mass. The high specific gravity aggregate is adjusted to a particle size of 150 μm or less. The finer the particle size, the better the mixability and dispersibility. However, the finer the particle size, the higher the energy cost required for pulverization, so the lower limit of the particle size is about 30 μm from a practical aspect.

Although the compounding quantity of organic fiber is 4-10 mass parts, it is preferable to mix | blend 6-8 mass parts. This is because the strength of the obtained inorganic plate is reduced when the blending amount is small, and the nonflammability is lowered when the blending amount is large. In addition, it is desirable to use softwood pulp as the organic fiber. Also, by setting the beating degree to 100 to 250 CSF (Canadian Standard Freeness), the high specific gravity aggregate adjusted to a particle size of 150 μm or less is prevented from settling by entanglement with the fiber, and papermaking is performed together with other raw materials. Is possible. Since hardwood has short fibers and is not suitable for papermaking, it is desirable to use softwood for pulp.
In addition to the above blending, as necessary, polypropylene, acrylic fiber, PVA (polyvinyl alcohol) fiber, rayon, aramid fiber, polyester fiber, etc. as organic fibers, glass fiber, carbon fiber, rock wool, etc. as inorganic fibers May be blended. These blending amounts are in the range of 0 to 10% (mass), preferably 3.5 to 5.0% of the entire composition, and may be changed as needed in accordance with the performance of the target inorganic plate.

  Furthermore, you may mix | blend a polymer flocculent as needed. Paper making becomes easier by blending the flocculant, but the blending amount is preferably 100 to 200 ppm based on the weight of the raw material. In addition, as a forming aid, commonly used aids such as a water retention agent and a water reducing agent may be added.

These blends are made with a round netting machine. The slurry concentration of the blend is adjusted to 3-6%. This is because when the concentration is low, the raw material is not easily entangled with the organic fiber, and when the concentration is high, it is difficult to produce the paper and the smoothness of the product cannot be obtained.
In the round net-type paper machine, the slurry in the bat is dewatered and paper-sheeted in a sheet form on the felt with a round net. The sheet thus produced has a thickness of about 0.5 to 1.0 mm, and this sheet is laminated with a making roll until a desired thickness is obtained. The laminated paper sheets are developed by a cutting machine and received by a receiving conveyor. Then, an inorganic board | plate material is manufactured through process steps, such as press processes, curing processes, such as an autoclave, cutting | disconnection, and surface grinding.
When pressing is performed, pressing is performed at 300 (kg / cm ² ) or less, preferably 50 to 250 (kg / cm ² ). When the pressing pressure is 250 (kg / cm ² ) or more, the interlaminar of the laminated green plates occurs depending on the raw materials to be blended.
When performing an autoclave process, it is 200 degrees C or less, Preferably it carries out at 150-200 degreeC. When the autoclave temperature is 200 ° C. or higher, the organic fibers are deteriorated. When the autoclave temperature is 150 ° C. or lower, the strength of the inorganic plate material is lowered depending on circumstances.
In addition, as for the lamination | stacking with the making roll in a round net-type paper machine, it is desirable to set it as about 3-20 mm according to the diameter of a making roll. When the lamination with the making roll is made thick, when the sheet is cut and formed into a plate shape, the interlayer is displaced due to the curvature of the making roll, and the delamination is likely to occur.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, the scope of the present invention is not limited only to an Example.

[Examples 1 to 3]
Cement, silica sand, magnetite powder, and softwood pulp were blended to prepare a slurry, and the papermaking property with a round net type papermaking machine was confirmed. Portland cement was used as the cement, and silica sand having an average particle size of 100 μm or less was used as the silica sand, and magnetite powder having an average particle size shown in Table 1 was used. The blending ratio of each component is shown in Table 1. The papermaking results are shown in Table 1.
For the raw material composition that could be made, a sheet with a thickness of 0.6 mm was made, laminated with a making roll to 5.4 mm, expanded, pressed, adjusted to 4.8 mm, and then autoclaved. And a cutting process was performed to obtain a sheet-like magnet adsorbent having a size of 1,000 mm × 2,000 mm and t = 4.8 mm.

Using the sheet-like magnet adsorbent obtained in the example and a commercially available ferrite magnet having a magnet area of 5 cm ² and a weight of 35.8 g, it was verified how much can be held on the vertical surface. The verification was made by cutting the longitudinal direction of the obtained sheet-shaped magnet adsorbent 1 in half and fixing it to a wall surface with a size of 500 mm × 1,000 mm. As shown in FIG. 1, A4 copy paper (size 210 mm × 297 mm) , Basis weight: about 64 g / m ² ) 2 was held by the button-shaped magnet 3. It was confirmed that the composition 1 (Example 1) could hold 8 sheets and the composition 2 (Example 2) could hold 5 sheets. In addition, it was confirmed that an accessory case with a plastic magnet (width 80 mm × height 50 mm × depth 60 mm) can hold about 80 g. The results of Examples 1 to 3 and Comparative Examples 4 to 8 are shown in Table 1.

  In this embodiment, the magnet adsorbent is used, but the present invention is not limited to this. By changing the type of high specific gravity aggregate, it is possible to provide functions such as mature conductivity, conductivity, radio wave absorption, electromagnetic wave absorption, and sound insulation.

Since the inorganic plate material composition of the present invention can make a high specific gravity raw material with a round net type paper machine, even without laminating a resin sheet containing a high specific gravity raw material on the plate surface, magnet adsorbability, thermal conductivity, It is possible to obtain an inorganic plate material having excellent functionality such as conductivity, radio wave absorption, electromagnetic wave absorption, and sound insulation.
In addition, according to the above production method, it is possible to produce a thinner inorganic plate material composition than other production methods, so that walls, floors, ceilings, etc. can be used as fire wall materials, electromagnetic wave sealing materials, sound insulation materials or display materials. It is expected to be widely used for building materials.

It is a perspective view which shows the state by which a paper is hold | maintained with a magnet at the sheet-like magnet adsorbent obtained by this invention.

Explanation of symbols

1 Sheet-shaped magnet adsorbent 2 A4 copy paper 3 Button-shaped magnet

Claims (6)

  In an inorganic plate material composition comprising a hydraulic material and an aggregate as main components and an organic fiber blended, the aggregate has a specific gravity of less than 1.0 to 3.0 as a low specific gravity aggregate of 15 to 80 parts by mass of the hydraulic material. An inorganic plate material composition comprising 5 to 50 parts by mass, 10 to 76 parts by mass of an aggregate having a specific gravity of 3.0 to 8.0 as a high specific gravity aggregate, and 4 to 10 parts by mass of organic fibers.   The inorganic board | plate material composition of Claim 1 which mix | blends the aggregate which adjusted the particle size to 150 micrometers or less as said high specific gravity aggregate.   The inorganic board | plate material composition of Claim 1 or Claim 2 which mix | blends the fiber which adjusted the beating degree of the cellulose fiber to 100-300CSF as the said organic fiber.   An inorganic plate material composition comprising a hydraulic material, a low specific gravity aggregate, and a high specific gravity aggregate as main components and blended with organic fibers, the aggregate having a particle size adjusted to 150 μm or less as the high specific gravity aggregate The inorganic board | plate material composition characterized by mix | blending the fiber which adjusted the beating degree of the cellulose fiber to 100-300CSF as organic fiber.   The inorganic board material composition according to any one of claims 1 to 4, wherein the inorganic board material composition is manufactured by a round net-type paper machine.   In the manufacturing method of the inorganic board | plate material composition which makes a slurry which mix | blended the slurry which mix | blended the organic material with a hydraulic material and an aggregate as a main component, 15-80 mass parts of hydraulic materials, specific gravity as a low specific gravity aggregate 1.0 to less than 3.0 aggregate 5 to 50 parts by mass, high specific gravity aggregate 10 to 76 parts by mass of aggregate 3.0 to 8.0, and 4 to 10 parts by mass of organic fiber A method for producing an inorganic plate material, which comprises producing the slurry obtained by making a paper using a round net type paper machine.

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