JPH101348A - Cement board containing wooden chips and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a cement board containing wooden chips low in cost, light in weight and improved in strength and fire resistance by providing a fireproofing component-containing layer on one side or both sides of the cement board containing wooden chips. SOLUTION: A heat-setting component consisting essentially of alumina cement, anhydrous gypsum and/or hemihydrate gypsum and Portland cement are compounded within (1:4) to (4:1), by weight, to obtain a cement composition. 75-95wt.% with cement composition, 5-30wt.% fractionallized wooden chips and water are mixed with each other and formed into a plate shape, then hardened to obtain the cement board containing wooden chips. A coating material incorporating the fireproofing component 121 such as ammonium salt, and amino compound and expandable graphite is applied to one surface or both surfaces of the cement board 11 containing wooden chips to provide the fireproofing component-containing layers 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood cement board mainly used as a building material for an outer wall and the like and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a fire protection structure for an outer wall of a prefabricated house or the like, for example, as described in Japanese Patent Publication No. 61-16823, a foam fire protection structure is formed at a joint formed at a joint portion of panels. A panel joint fire prevention structure in which paint, an inorganic heat insulating material and a caulking agent are sequentially laminated and filled;
As described in Japanese Patent Application Laid-Open No. 1-24738, a joint structure of an outer wall is known in which a sheet having a foamable fireproof material is disposed along the joint on the back side of the joint between the exterior materials.

[0003] Outer wall materials suitable for such a fire-preventing structure are ALC and a scalp board having fire resistance performance by themselves. However, since these outer wall materials are heavy and thick, they are difficult to handle. However, it has the disadvantage that it is weak and brittle against external force. In recent years, as an alternative to such conventional outer wall materials, wood chip cement boards, which are composite moldings of woody materials and cements, are inexpensive, lightweight, and excellent in strength, so that they are widely used. It has become to.

[0004]

However, since the wood chip cement board does not have fire resistance,
When used for applications requiring fire resistance, it is necessary to improve its own fire resistance.

The present invention has been made to solve the above-mentioned conventional problems and to provide a wood chip cement board which is inexpensive, lightweight, excellent in strength, and excellent in fire resistance, and a method for producing the same. It was made for the purpose.

[0006]

Means for Solving the Problems The present invention 1 (the invention according to claim 1 of the present application) is obtained by curing a molded article comprising a mixture of finely divided wood chips, a cement composition, and water. A wood chip cement board in which a fireproof component-containing layer is provided on at least one of the front and back surfaces of the obtained wood chip cement substrate.

Invention 2 (Invention described in claim 2 of the present application)
Heats a compact formed from a mixture of water and a cement composition containing a finely divided wood chip, a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or hemihydrate gypsum) and Portland cement. It is a wood chip cement board in which a fireproof component-containing layer is provided on at least one of the front and back surfaces of a wood chip cement substrate obtained by curing.

[0008] Invention 3 (the invention described in claim 3 of the present application)
Is a step of supplying a mixture of fragmented wood chips, a cement composition, and water onto a mold, forming the formed product, pressurizing and curing the formed body to form a wood chip cement substrate, Laminating a fire-protection component-containing layer on at least one of the front and back surfaces of the cement substrate.

Invention 4 (the invention described in claim 4 of the present application)
Supplies a mixture of finely divided wood chips, a cement composition including a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or hemihydrate gypsum) and Portland cement, and water to a mold. And press-molding, and heat-curing the molded body to form a wood chip cement substrate, and a wood chip cement comprising a step of laminating a fireproof component-containing layer on at least one of the front and back surfaces of the wood chip cement substrate. This is a method for manufacturing a plate.

In the present invention 1 to the present invention 4 (hereinafter referred to as the present invention), the fragmented wood chips include, for example,
Cedar, cypress, pine, toga, straw, nara, birch, beech, oak,
Wood chips made of wood chips made from materials such as Lauan, Hiba, Chestnut, Keyaki, Shii, Willow, and Bamboo are used. A piece of wood
It may be only a piece of wood made of wood chips made of new wood, or may be a piece of wood made of wood chips made of waste wood of construction.

As a method for producing the wood chip, a known method can be used, and examples thereof include a method of pressing with a press or a rotating roll, a method of cutting with a slitter or a cutting machine, and the like. The size, length, and shape of the wood chip pieces can be arbitrarily determined according to the application, strength, and the like.

In the present invention, the mixing ratio of the finely divided wood pieces and the cement composition is preferably 5 to 30% by weight of the wood pieces and 70 to 95% by weight of the cement composition. If the mixing ratio is less than 5% by weight of wood chips and more than 95% by weight of the cement composition, the advantage of mixing the wood chips is diminished, the raw material cost is increased, and less than 5% by weight of the cement composition and 30% by weight of the wood chips. If it exceeds, the product strength cannot be increased.

In the present invention 1 and the present invention 3, as the cement composition, one containing Portland cement as a main component is used. In the present invention 2 and the present invention 4, as the cement composition, a cement composition containing a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or gypsum hemihydrate) and Portland cement is used. Lime may be contained in the thermosetting component.

In the present invention 2 and the present invention 4, the mixing ratio of Portland cement to the thermosetting component in the cement composition is preferably 1: 4 to 4: 1 by weight. Outside this range, if the content of the thermosetting component in the cement composition is too small and the content of Portland cement is too large, the effect of accelerating hardening by heating is reduced, and the cement composition for wood chips is If the adhesive strength is not improved and it is difficult to improve the strength of the obtained wood chip cement board, conversely, if the content of the thermosetting component is too large and the content of Portland cement is too small, the raw material cost Goes up.

In the present invention, the fire-prevention component in the fire-prevention component-containing layer may be foamed or expanded by a flame or hot air, such as an ammonium salt such as ammonium polyphosphate, an amino compound, or expandable graphite. One that exerts fire prevention performance by covering the fire-protected object with the cover. Examples of the form of the fire-prevention component-containing layer include a coating layer formed by applying a paint containing the fire-prevention component, a layer to which a sheet containing the fire-prevention component is attached, and the like.

In the present invention, the fire protection component-containing layer may be provided on either one of the front and back surfaces of the wood chip cement substrate, or may be provided on both surfaces.

In the present invention 3 and the present invention 4, after the wood chip cement substrate is formed, a fire-preventive component-containing layer may be laminated on at least one of the front and back surfaces of the wood chip cement substrate. Further, at the same time as the molding of the wood chip cement substrate, a fire protection component-containing layer may be laminated on at least one of the front and back surfaces of the wood chip cement substrate.

[0018]

According to the present invention, the wood chip cement board of the present invention is characterized in that at least one of the front and back surfaces of a wood chip cement substrate obtained by hardening a compact formed of a mixture of a fragmented wood chip, a cement composition and water. On the surface, by providing the fire-protection component-containing layer, as a wood chip cement board, inexpensive, lightweight, having the characteristics of excellent strength, in addition to the fire-protection component-containing layer is provided When a flame or hot air acts on the surface, the fire-preventive component in the fire-preventive component-containing layer foams or flows out, thereby cutting off the flame or hot air from the wood-chip cement substrate, thereby enabling the fire protection of the wood-chip cement substrate. So it has excellent fire protection performance.

[0021] The wood chip cement board of the present invention 2 is a cement composition containing a finely divided wood chip, a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or hemihydrate gypsum) and Portland cement, By providing a fireproof component-containing layer on at least one of the front and back surfaces of the wood chip cement substrate obtained by heat-curing a molded body made of a mixture with water, as a wood chip cement board, inexpensive. ,
In addition to having the characteristics of being lightweight and having excellent strength, when the flame or hot air acts on the surface on which the fire protection component-containing layer is provided, does the fire protection component in the fire protection component-containing layer foam? It is possible to prevent the flame and the hot air from flowing out from the wood chip cement substrate by flowing out, thereby preventing the wood chip cement substrate from fire. Therefore, the fire prevention performance is excellent.

The method for producing a wood chip cement board of the present invention 3 is as follows.
A step of supplying a mixture of finely divided wood pieces, a cement composition, and water on a mold to form, then curing by pressurizing and curing to form a wood chip cement substrate, and a table of the wood chip cement substrate. A step of laminating a fire-preventive component-containing layer on at least one of the back surfaces can produce a wood chip cement board excellent in fire-protection performance with high productivity.

The production method of the wood chip cement board of the present invention 4 is as follows.
A mixture of finely divided wood chips, a cement composition comprising Portland cement and a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or hemihydrate gypsum), and water is supplied to a mold to be added. After pressure molding, heat curing to form a wood chip cement substrate, and at least one of the front and back surfaces of the wood chip cement substrate, a step of laminating a fireproof component-containing layer, to promote curing Therefore, a wood chip cement board excellent in fire prevention performance can be manufactured with higher productivity.

[0022]

Embodiments of the present invention will be described below. FIG. 1 is a sectional view showing an example of a wood chip cement board of the present invention. 1 is a wood chip cement board. The wood chip cement board 1 is provided with a wood chip cement substrate 11 obtained by hardening a compact formed of a mixture of a fragmented wood chip, a cement composition, and water. On the front and back surfaces of the wood chip cement substrate 11, fire protection component-containing layers 12, 12 each composed of a coating layer formed by applying a paint containing the fire protection components 121, 121 are provided.

The wood cement board 1 is formed by applying a coating containing the fireproof components 121, 121 to the front and back surfaces on which the fireproof component-containing layers 12, 12 are provided, when a flame or hot air acts thereon. Fire protection component-containing layer 1 consisting of a coating layer
Since the fire prevention components 121 and 121 in 2 and 12 are foamed, the flame and the hot air are blocked from the wood chip cement substrate, and the fire of the wood chip cement substrate can be performed, so that the fire prevention performance is excellent.

FIG. 2 is a sectional view showing another example of the wood chip cement board of the present invention. 2 is a wood chip cement board. The wood chip cement board 2 is composed of a mixture of water and a cement composition containing finely divided wood chips, a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or gypsum hemihydrate) and Portland cement. It has a wood chip cement substrate 21 obtained by heating and curing the molded body. On the front and back surfaces of the wood chip cement substrate 21, fire protection components 221 and 22 are respectively provided.
1, a fire-retardant component-containing layer 22 made of a sheet-like material containing 1
22 are provided.

When a flame or hot air acts on the front and back surfaces on which the fire protection component-containing layers 22 and 22 are provided, the fire protection component 22
The fire-preventive components 221 and 221 in the fire-preventive component-containing layers 22 and 22 formed of a sheet-like material including the first and second 221 are flowed out, and the flame and the hot air are cut off from the wood chip cement substrate.
Since the fire prevention of the wood chip cement substrate can be achieved, the fire prevention performance is excellent.

FIG. 3 is a sectional view sequentially showing the steps of one example of the method for producing a wood chip cement board of the present invention. First, FIG.
As shown in (a), a mixture of finely divided wood chips made of wood chips, ordinary Portland cement, and water is
30kg / c by hot pressing
The molded body was cured by curing at room temperature for 2 days at a pressure of ² m ² , and then released from the mold.
Get.

Next, as shown in FIG. 3 (b), a fire protection component 12
After coating with a coating material containing 1,121, the fire protection component-containing layers 12, 12 composed of the coating film layer are laminated by drying to obtain a wood cement board 1 as shown in FIG.

FIG. 4 is a sectional view sequentially showing the steps of another example of the method for producing a wood chip cement board of the present invention. First, FIG.
As shown in (a), a mixture of a fragmented wood piece, a cement composition containing Portland cement, a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and) gypsum hemihydrate, and water. Is deposited on a forming mold, molded by heating at 30 kg / cm ^{2 at} a temperature of 93 ° C. for 15 minutes, heated and cured, and then demolded to obtain a wood chip cement substrate 21.

Next, as shown in FIG. 4 (b), a sheet containing a fire-preventive component is laminated on each of the front and back surfaces of the wood chip cement board 11, and the wood cement board 2 as shown in FIG. obtain.

[0030]

The wood cement boards of the present invention 1 and the present invention 2 are each configured as described above, so that they are inexpensive,
A wood chip cement board that is lightweight, has excellent strength, and has excellent fire resistance.

Since the methods for producing the wood cement boards of the present invention 3 and the present invention 4 are respectively configured as described above,
A wood chip cement board that is inexpensive, lightweight, excellent in strength, and excellent in fire resistance can be manufactured with high productivity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a wood cement board of the present invention.

FIG. 2 is a sectional view showing another example of the wood cement board of the present invention.

3A and 3B are explanatory views illustrating an example of a method for producing a wood cement board of the present invention, in which FIG. 3A is a cross-sectional view illustrating a first half process, and FIG. 3B is a cross-sectional view illustrating a second half process; It is.

FIGS. 4A and 4B are explanatory views illustrating another example of the method for producing a wood cement board of the present invention, in which FIG. 4A is a cross-sectional view illustrating the first half of the process, and FIG. It is sectional drawing.

[Brief description of reference numerals]

 1, 2 wood chip cement board 11, 21 wood chip cement board 12, 22 fire protection component containing layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location E04C 2/16 E04C 2/16 E

Claims (4)

[Claims] Claims 1. At least one of the front and back surfaces of a wood chip cement substrate obtained by curing a compact formed of a mixture of a fragmented wood chip, a cement composition, and water,
A wood chip cement board provided with a fire protection component-containing layer. 2. A molding comprising a mixture of water and finely divided wood chips, a cement composition comprising a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or gypsum hemihydrate) and Portland cement. A wood chip cement board, wherein a fire protection component-containing layer is provided on at least one of the front and back surfaces of a wood chip cement substrate obtained by heating and curing a body. 3. A step of supplying a mixture of finely divided wood chips, a cement composition, and water onto a mold and forming the same, press-curing and curing the formed body to form a wood chip cement substrate. And a step of laminating a fire-preventive component-containing layer on at least one of the front and back surfaces of the wood chip cement substrate. 4. A mixture of finely divided wood chips, a cement composition containing a thermosetting component mainly composed of alumina cement, anhydrous gypsum or (and / or hemihydrate gypsum) and Portland cement, and a water mold. Supplying on top and press molding, the step of heat-curing the molded body to form a wood chip cement substrate, and the step of laminating a fire protection component-containing layer on at least one of the front and back surfaces of the wood chip cement substrate A method for producing a wood chip cement board.