JP3038117U - Wood cement board - Google Patents

Abstract

(57) [Abstract] [Problem] Strength, corrosion resistance, and
A wood-based cement that exerts an effect of preventing dew condensation due to its superior moisture absorption and desorption, that is, humidity control, without changing various excellent properties such as heat insulation and fire resistance, and can also improve deodorant properties more than ever before. Provide the board. SOLUTION: A wood material 2, such as wood wool, wood fiber, wood chips, pulp, cement, diatomaceous earth powder obtained by partially or entirely firing at 600 to 800 ° C, and a setting accelerator containing magnesium chloride in water. Knead with and blend in a mixer. The wood-based cement board 1 is formed by applying pressure to form this, and drying and hardening.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 INDUSTRIAL APPLICABILITY The present invention is widely used as a building material for outer wall basement, roof field, slab basement, outer wall material, interior material, heat insulating material and sound absorbing material, and has strength, corrosion resistance, heat insulating property, fire resistance, deodorizing property, and The present invention relates to improvement of a wood-based cement board that has excellent moisture absorption / release properties, that is, humidity control properties.

[0002]

[Prior art]

 Wood-based cement boards are generally made by blending cement mixed with water and wood materials such as wood wool, wood fibers, wood chips, and pulp in a mixer, pouring it into a template, press-molding it, and drying it. It is formed by curing.

Regarding the above-mentioned various excellent basic properties as a wood-based cement board, for example, when molding is performed to further improve sound absorption, the structure of wood fibers and the structure of pores are modified, and corrosion resistance is improved. In order to improve the performance, wood materials have been subjected to anti-corrosion processing in advance, and in order to exert more deodorizing properties, additives such as deodorizing agents in the manufacturing process and ceramic powder with a low molecular gas adsorption oxidation catalyst function have been added. Various measures such as addition and kneading, and addition of a combustion inhibitor to make the material incombustible have been elaborated.

[0004]

[Problems to be solved by the device]

 However, at the expense of other properties to improve one property, e.g. when increasing the proportion of cement and reducing the proportion of wood to make it non-combustible, heat insulation, sound absorption and This is something that must be avoided, since the workability is deteriorated due to the most important light weight. Therefore, it is necessary to pay close attention to improve the above various characteristics of the wooden cement board. In particular, in recent years the building structure has become more and more airtight, making it difficult for air to flow in the room, and because the building material itself does not absorb or release moisture, i.e., humidity control, the indoor heating causes dew condensation, which causes molds and mites. However, there is a problem that the odor is easily stored inside the room.

Therefore, an object of the present invention is to exert a dew condensation preventing effect by a better humidity control property without changing various excellent properties of a wood-based cement board, and to improve deodorizing property more than ever. It is to provide a wood-based cement board that can be used.

[0006]

[Means for Solving the Problems]

 The above-mentioned problems are solved by a wood-based cement board characterized by being formed by kneading and pressurizing wood materials such as wood wool, wood fibers, wood chips, pulp, and cement, a diatomaceous earth powder, and a setting accelerator containing magnesium chloride. To be done.

A coagulation accelerator containing magnesium chloride may be added when kneading the wood material, the cement and the diatomaceous earth powder.

Further, part or all of the diatomaceous earth powder may be calcined at 600 to 800 ° C.

Further, marine diatomaceous earth may be used as the diatomaceous earth powder.

[0010]

[Embodiment of the invention]

 FIG. 1 shows a cross section of a wood-based cement board 1 of the present invention. Reference numeral 2 denotes wood material such as wood wool, wood fiber, wood chips or pulp, and diatomaceous earth powder on the surface so that the wood materials 2 are fixed to each other. And cement is attached. Reference numeral 3 denotes pores formed in the gap between the wood materials 2.

[0011] Diatomaceous earth is a sedimentary soil formed by depositing diatom shells, which are phytoplankton of single-celled algae, on the seabed or the lake bottom. . The main component of this powder is made of silicon dioxide (SiO ₂ ), and the surface has fine pores of 0.1 to 0.2 μm arranged regularly in a circular shape or a needle shape, and the porosity exceeds 70 to 90%. It has a porous structure. This super-porous structure exhibits excellent moisture absorption and deodorizing properties comparable to silica gel, and when the water content reaches a certain level, it impervious to water and further absorbs absorbed water. It also exhibits the moisture releasing property. In addition, since the porosity is large, the thermal conductivity is as low as 0.09 Kcal / mh ° C. at 25 ° C., and the melting temperature is 1400 to 1750 ° C., which is high in heat resistance.

The diatomaceous earth powder is obtained by classifying and purifying diatomaceous earth and firing it at 600 to 800 ° C. to obtain a powder, or a mixture of the fired diatomaceous earth powder and a non-fired diatomaceous earth powder. Combustible substances such as organic substances are decomposed in the calcined diatomaceous earth powder, and amorphous silicon dioxide is crystallized to improve chemical stability. However, the diatomaceous earth powder calcined at 900 ° C or higher promotes crystallization of amorphous silicon dioxide and transforms it into cristopalite, which has an extremely small specific surface area and loses moisture absorption / release properties. The firing temperature and the mixing ratio of the fired diatomaceous earth powder and the non-fired diatomaceous earth powder are appropriately set in consideration of both chemical stability and moisture absorption / desorption.

A part or all of the diatomaceous earth powder used in the present invention is calcined at a relatively low temperature of 600 to 800 ° C., which does not lose its moisture absorption and desorption property as compared with the non-calcined diatomaceous earth powder. , Which absorbs moisture when the indoor relative humidity becomes high, and repeats the phenomenon of releasing moisture when the relative humidity becomes low, and has excellent breathability, and also releases moisture vapor adsorbed from indoors with high humidity to outdoor with low humidity. Is also excellent.

As a method for producing a wood-based cement board having such a configuration, diatomaceous earth powder, cement and a coagulation accelerator containing magnesium chloride are mixed and kneaded with water, and the wood material is blended in a mixer. Then, after a certain amount of this is dropped on the template with a measuring device, a desired thickness gauge is applied, the template is further covered and pressed, fixed with metal fittings, and dried and cured after the required curing time. After that, it is formed by taking it out.

Although diatomaceous earth to be used includes marine species and freshwater species, in the present invention, it is more preferable to use marine species of diatomaceous earth because it contains a bittern component used as a coagulant. It is more preferable.

[0016]

[Effect of the invention]

 However, according to the wood-based cement board of the present invention, wood materials such as wood wool, wood fibers, wood chips, and pulp, and cement, diatomaceous earth powder, and a coagulation accelerator containing magnesium chloride are kneaded and formed by pressing. It does not change the excellent properties such as strength, workability, corrosion resistance, heat insulation, fire resistance, etc. of the wood cement board, and exerts the dew condensation prevention effect by the outstanding moisture absorption and desorption property, that is, humidity control property. And, the deodorizing property can be improved more than ever.

That is, when the wood-based cement board of the present invention that exhibits the above-mentioned various characteristics is used as a building material such as an outer wall material, an outer wall base material, an interior material, etc., the relative humidity in the room is kept above a certain level. When the building temperature rises, the building material itself absorbs water vapor to lower the relative humidity, and when the indoor relative humidity decreases, it releases the absorbed water vapor to the interior and raises the relative humidity. Maintaining the relative humidity in the room at around 60%, which is considered most comfortable for humans, and solving the problems that the room is contaminated by dew condensation due to heating in winter and odors tend to remain in the room. It is possible to maintain a good living environment.

[Brief description of the drawings]

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

[Explanation of symbols]

 1 Wood-based cement board 2 Wood material 3 Pore

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Claims (4)

[Utility model registration claims] 1. A wood-based cement board formed by kneading wood material such as wood wool, wood fiber, wood chips, pulp, and cement and diatomaceous earth powder and applying pressure. 2. The wood-based cement board according to claim 1, wherein a setting accelerator containing magnesium chloride is added when the wood-based material, cement and diatomaceous earth powder are kneaded. 3. Part or all of the diatomaceous earth powder is 600-8.
The wood-based cement board according to claim 1, which is fired at 00 ° C. 4. The wood-based cement board according to claim 1, wherein a diatomaceous earth of marine species is used as the diatomaceous earth powder.