JP2007331336A - Fiberboard and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiberboard which can be manufactured by a conventional wet paper-making method and shows high repellency for ants and antiseptic property by uniformly and efficiently applying a boron compound on the surface of each fiber of the fiberboard, and to provide its manufacturing method. <P>SOLUTION: The fiberboard 10 is made by the wet paper-making method using slurry composed of a wooden fiber, an inorganic fiber of not less than 5 wt.% to not more than 50 wt.% of the added wooden fiber, the boron compound showing solubility of not less than 0.01 wt.% to less than 2 wt.% at 20°C and a binder. The fiberboard 10 has specific gravity of not less than 0.2 to not more than 0.3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an interior material applied to a wall, floor, ceiling or the like of a general house, and more particularly to a fiberboard that can also be used as a heat insulating material.

Hitherto, an architectural fiberboard excellent in ant-proofing property, fireproofing property and physical strength has been proposed. For example, an architectural fiber produced by making an aqueous slurry mainly composed of mineral fibers and organic fibers to form a wet mat, and then applying and impregnating the wet mat with a boron compound dissolved in hot water. There is a plate (see Patent Document 1).
Japanese Unexamined Patent Publication No. 6-47826

  However, the above-described production method requires not only a step of dissolving the boron compound in hot water, but also a need for applying and impregnating the solution to the wet mat, which requires labor. Further, since the solution obtained by dissolving the boron compound is applied and impregnated on the wet mat, it is difficult to uniformly adhere the boron compound to the entire fiberboard for construction, particularly to each fiber surface. Furthermore, since the solution is used to apply and impregnate the boron compound, it is necessary to increase the concentration of the boron compound or increase the amount of the solution to increase the yield of the boron compound adhered to the fiber surface. Production costs are high. When a high-concentration solution is used, a treatment facility for treating the waste liquid is required, and there is a problem that the production cost is further increased.

  In view of the above problems, the present invention can be manufactured by a normal wet papermaking method, and by uniformly and efficiently depositing a boron compound on the surface of each fiber of the fiberboard, it has high antifungal and antiseptic properties. It is an object of the present invention to provide a fiberboard having the above and a manufacturing method thereof.

  As a result of intensive studies to solve the above problems, the present inventors can uniformly and efficiently adhere the boron compound to the surface of each fiber by using a boron compound having low solubility. Based on this finding, the present invention has been completed.

  In order to solve the above problems, the fiberboard according to the present invention has a wood fiber, an inorganic fiber added in an amount of 5% by weight to 50% by weight of the added amount of the wood fiber, and a solubility of 0. A specific gravity of 0.2 or more and 0.3 or less formed by wet papermaking of a slurry comprising 01% by weight or more and less than 2% by weight of a boron compound and a binder.

  Since the fiberboard of the present invention is produced by making a slurry to which a boron compound having low solubility is added, the boron compound adheres uniformly and efficiently to the fiber surfaces of the wood fiber and the inorganic fiber. For this reason, a separate process is not required as in the conventional example, and not only the productivity is high, but also a fiberboard having high antproofing and antiseptic properties is obtained. In particular, since an inorganic fiber is added, a fiberboard having a fire resistance superior to a fiberboard made of only wood fibers can be obtained.

In an embodiment according to the present invention, the inorganic fiber may have a fiber length of 125 μm or more and 500 μm or less.
According to this embodiment, it is easy to disperse the inorganic fibers uniformly in the slurry, and a fiberboard with high strength is obtained.

As other embodiment concerning this invention, you may give this actual process to the outer periphery of the laminated board obtained by carrying out lamination | stacking integration of the above-mentioned several fiber board.
According to this embodiment, a fiberboard having high physical strength, easy assembling work, and high assembling accuracy can be obtained.

  The fiberboard manufacturing method according to the present invention comprises a wood fiber, an inorganic fiber added at 5% by weight or more and 50% by weight or less of the added amount of the wood fiber, a solubility of 0.01% by weight or more at 20 ° C., 2 A step of obtaining a slurry by mixing and dispersing less than% by weight of a boron compound and a binder in water, a step of wet-making a wet mat from the slurry, pressing the wet mat to squeeze moisture, And a step of heating and drying the squeezed wet mat to cure the binder.

  Since the fiberboard of the present invention is produced by making a slurry to which a boron compound having low solubility is added, the boron compound adheres uniformly and efficiently to the fiber surfaces of the wood fiber and the inorganic fiber. For this reason, a separate process is not required as in the conventional example, and a fiberboard having high productivity and high antproofing and antiseptic properties can be obtained. In particular, since inorganic fiber is added, there is an effect that a fiberboard having fire resistance superior to that of a fiberboard made of only wood fibers can be obtained.

  As an embodiment of the fiberboard according to the present invention, a wood fiber, an inorganic fiber added at 5 wt% or more and 50 wt% or less of the addition amount of the wood fiber, and a solubility of 0.01 wt% at a temperature of 20 ° C. As mentioned above, there is a fiberboard characterized by a specific gravity of 0.2 or more and 0.3 or less formed by wet-making a slurry comprising less than 2% by weight of a boron compound and a binder.

The wood fiber is not limited to its tree species, and may be a conifer or a broad-leaved tree, may be obtained from building waste or pallet waste, or may be plant fiber such as hemp or flax. .
Furthermore, the amount of wood fiber added is preferably 50% to 90% by weight of the total solid components. This is because if it is less than 50% by weight, the moisture absorption / release property, which is a characteristic of wood, is lowered, and condensation is likely to occur on the wall body. On the other hand, if it exceeds 90% by weight, the amount of inorganic fibers becomes relatively small and the necessary fireproof performance cannot be obtained.

Examples of the inorganic fibers include rock wool, glass wool, mineralane wool, and glass fiber, and these can be used alone or in combination of two or more.
The inorganic fiber preferably has a fiber length of 125 μm to 500 μm. If the thickness is less than 125 μm, the inorganic fibers are in a powdery state, and the fibers are unevenly inserted between wood fibers or become so-called lumps, resulting in variations in density and variations in heat insulation performance. On the other hand, when the thickness exceeds 500 μm, uniform mixing becomes difficult, it tends to be unevenly distributed, and the heat insulation performance varies.
Furthermore, it is preferable that the addition amount of the said inorganic fiber is 5 to 50 weight% of the addition amount of a wood fiber. This is because if it is less than 5% by weight, the flame retardant effect becomes poor, and if it exceeds 50% by weight, it becomes difficult to uniformly knead and productivity is lowered.

Boron compounds are added to enhance the antifungal and antiseptic properties, and examples thereof include borax, calcium borate, and zinc borate.
The boron compound used preferably has a solubility at 20 ° C. of 0.01% by weight or more and less than 2% by weight. If the content is less than 0.01% by weight, the solubility is too low, so even if an ant eats the boron compound, it does not dissolve in the body and the desired ant protection cannot be obtained. On the other hand, when the solubility is 2% by weight or more, it is easy to dissolve, so that the boron compound is difficult to adhere to the surface of the fiber, and the adhesion efficiency is lowered. Furthermore, if the solubility is high, an advanced wastewater treatment facility is required for wastewater treatment.
Moreover, it is preferable that the particle size of a boron compound is 10-100 micrometers. If the particle size is less than 10 μm, it will be difficult to adhere to the fiber and the yield will be poor, and if it exceeds 100 μm, the number of boron compound adhesion points (dispersion points) will decrease and the ant-proof effect will be relatively lowered. It is.
Furthermore, it is preferable that the addition amount of the boron compound added for slurry preparation is 2 wt% or more and 10 wt% or less of the total solid components. This is because if it is less than 2% by weight, the desired ant-repellent property cannot be obtained, and if it exceeds 10% by weight, improvement in the ant-repellent performance cannot be expected.

The binder is for binding and integrating the wood fiber and the inorganic fiber, and for example, phenol resin, poval resin, epoxy resin, starch, etc. can be used, and these can be used alone or in combination of two or more. Can be used in combination.
And the addition amount of the said binder has preferable 1 to 10 weight% of a total solid component. This is because if the amount is less than 1% by weight, the desired adhesive strength cannot be obtained and the plate strength decreases, and if it exceeds 10% by weight, the increase in the adhesive strength is lost and only the production cost increases.

  Further, if necessary, a water-resistant agent such as wax, rosin and rosin wax, a flocculant such as sulfate band and polyaluminum chloride, or an antifoaming agent may be appropriately added to the slurry as a papermaking additive. .

(Example)
The wood fiber is 80% by weight of pine and cedar mixed material, the inorganic fiber is 12.5% by weight of rock wool, the boron compound is an average particle size of 20 μm, and the solubility in water at 20 ° C. is 3% by weight of calcium borate. In addition, 3% by weight of starch as a binder was added to fresh water, and 1.5% by weight of other water-resistant agents, flocculants, antifoaming agents, etc. were added to water and stirred to obtain a slurry having a solid content of 2%. . Then, the slurry was made to obtain a wet mat, which was pressed to squeeze out moisture and adjust the thickness. Subsequently, the wet mat was heated and dried in a drying furnace to cure the binder, thereby obtaining a fiber board having a thickness of 20 mm. A square sample having a length of 20 mm and a width of 20 mm was cut out from the fiber plate, and an anti-antaliency test according to JIS-K-1571 was performed on the sample.

  Further, the obtained two fiber boards are bonded to each other with an adhesive to form a fiber board having a thickness of 40 mm, and further, tenoner processing is performed on the outer periphery of the fiber board, whereby a male 10a as shown in FIG. Sample 10 having female seed 10b was obtained. And the said sample 10 was constructed | assembled as a heat insulating material of an external heat insulation construction method as shown in FIG.2 and FIG.3.

  That is, the inter-columns 12 are disposed between the columns 11 at a predetermined pitch, and are connected by the rolling stoppers 13. Further, a heat insulating material 14 is filled between the pillars 11 and the inter-posts 12, and an interior material 15 and a structural surface material 16 are attached to the pillars 11 and the inter-posts 12. Next, the sample 10 is abutted against and attached to the outward surface of the structural face material 16, and a waterproof paper 17 is attached to the surface of the sample 10. And the exterior material 19 was fixed through the trunk | drum 18 for ventilation, and the joint part was sealed. In addition, 20 is a trunk difference, 21 is a foundation, 22 is a foundation.

(Comparative example)
A square sample having a length of 20 mm and a width of 20 mm was cut out from a commercially available class A insulation board (thickness 20 mm), and an ant-proofing test according to JIS-K-1571 was performed in the same manner as in the Examples.

  As a result of the ant protection test according to the above-mentioned JIS-K-1571, the mass reduction rate of the example was 9%, while the mass reduction rate of the comparative example was 19%. Therefore, it was found that the fiberboard according to the present invention has higher ant protection than the commercially available Class A insulation board.

  It was confirmed that normal construction was possible by constructing the fiberboard according to the example as a heat insulating material by the outer heat insulation method.

  In addition, since the inorganic fiber is not added to the said A class insulation board, it is clear that the fiber board which concerns on this invention has the flame retardance and fireproofing which were excellent.

  The fiberboard according to the present invention is not limited to the interior material and the heat insulating material described above, but can be used as other building materials.

It is a perspective view which shows the case where the fiber board which concerns on this invention is used as a heat insulating material. It is a perspective view which shows the state which constructed the heat insulating material shown in FIG. 3A and 3B are a longitudinal sectional view and a transverse sectional view showing a state in which the heat insulating material shown in FIG. 1 is applied.

Explanation of symbols

10: Fiberboard 10a: Male fruit 10b: Female fruit

Claims (4)

  Bonded with wood fiber, inorganic fiber added at 5% by weight or more and 50% by weight or less of the amount of wood fiber, and boron compound with solubility at 20 ° C. of 0.01% by weight or more and less than 2% by weight A fiberboard characterized by having a specific gravity of 0.2 or more and 0.3 or less formed by wet papermaking a slurry comprising an agent.   The inorganic fiber according to claim 1, wherein the fiber length is 125 μm or more and 500 μm or less.   A fiberboard, wherein the actual processing is performed on the outer periphery of a laminated board obtained by laminating and integrating a plurality of the fiberboards according to claim 1 or 2. A wood fiber, an inorganic fiber added in an amount of 5% by weight or more and 50% by weight or less of the amount of the wood fiber, a boron compound having a solubility of 0.01% by weight or more and less than 2% by weight at a temperature of 20 ° C., and , A step of mixing and dispersing the binder in water to obtain a slurry, a step of wet-making a wet mat from the slurry, a step of pressing the wet mat to squeeze moisture, and adjusting the thickness, A method of manufacturing a fiberboard, comprising: heating and drying the wet mat to cure the binder.

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