JP2014168902A - Fire-resistant modified wood and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire-resistant modified wood having enhanced noncombustibility or flame resistance, capable of reducing costs and contributing to environmental preservation with use of shells as waste substance; and manufacturing method thereof.SOLUTION: The fire-resistant modified wood is manufactured by performing: a fine pulverizing step S1 of fine pulverizing shells; a solution preparation step S2 of dispersing fine pulverized shells obtained in the fine pulverizing step S1 in a solvent so as to prepare a solution having a predetermined concentration; an immersion step S3 of immersing a wood in the solution obtained in the solution preparation step S2 under reduced pressure, for impregnation of the cells of wood and cell interstices inside the wood with the solution; and a drying step S4 of drying the wood obtained in the immersion step S3.

Description

  The present invention relates to a fireproof processed wood used as a building material such as a structural material, a base material, an interior material or an exterior material of a building, and a method for producing the same.

  In recent buildings, fire-resistant wood with increased flame retardance is often used in order to prevent fires from occurring or to suppress the spread of fire. However, hitherto, fireproof processed wood with higher incombustibility or flame retardancy has been proposed by impregnating wood used as a building material with, for example, a boric acid compound or a halogen compound. In addition, since this prior art is not related to the literature known invention, there is no prior art document information to be described.

  However, in the above prior art, a boric acid compound or a halogen compound is required in order to further enhance the incombustibility or flame retardancy, so that the manufacturing cost increases, and it was used as an interior material or exterior material of a building. In this case, there is a problem that the construction cost is remarkably increased. In addition, the present applicant has come to consider the suppression of the manufacturing cost by using a shell that is normally discarded as a material for further increasing the incombustibility or flame retardancy.

  This invention is made | formed in view of such a situation, and while being able to contribute to environmental conservation, suppressing the manufacturing cost using the shell as waste, nonflammability or a flame retardance is raised more. An object of the present invention is to provide a fireproof processed wood and a method for producing the same.

  The invention according to claim 1 is a fire-resistant processed wood used as a building material such as a structural material, a base material, an interior material, or an exterior material of a building, wherein a finely powdered shell is contained in wood constituent cells and cell gaps. It is characterized by comprising.

  According to a second aspect of the present invention, in the refractory processed wood according to the first aspect, the finely pulverized shell is composed of an oyster shell or a scallop shell.

  A third aspect of the present invention is the fireproof processed wood according to the first or second aspect, wherein the pulverized shell is heated and fired.

  The invention according to claim 4 is a pulverization step of pulverizing a shell in a method for producing fireproof wood used as a building material such as a structural material, a base material, an interior material or an exterior material of a building, A solution preparation step in which the finely pulverized shell obtained in the pulverization step is diffused into a solvent to prepare a solution of a predetermined concentration, and wood is immersed in the solution obtained in the solution preparation step The refractory processed wood is obtained by passing through a dipping step that allows the solution to soak into the wood constituent cells and cell gaps inside the wood by reducing the pressure while drying, and a drying step that dries the wood obtained in the dipping step. It is characterized by obtaining.

  According to a fifth aspect of the present invention, in the method for manufacturing a fireproof processed wood according to the fourth aspect, the shell made into a fine powder in the fine powdering step is composed of an oyster shell or a scallop shell.

  A sixth aspect of the present invention is the method for producing a refractory processed wood according to the fourth or fifth aspect, wherein the pulverization step heats and shells the shell.

  According to the first and fourth aspects of the invention, since the finely crushed shell is contained in the wood constituent cells and the cell gap, it contributes to environmental conservation while suppressing the manufacturing cost by using the shell as waste. In addition, the nonflammability or flame retardancy can be further increased.

  According to the inventions of claims 2 and 5, since the shell to be finely powdered is composed of oysters or scallop shells, it is possible to more effectively promote the use of shells as waste and to be nonflammable. Alternatively, flame retardancy can be increased.

  According to the inventions of claims 3 and 6, since the finely crushed shell is heated and fired, it can be disinfected by heating when the shell is contained in the fireproof processed wood, and various bacteria attached to the shell are removed. Thus, the sanitary condition can be made favorable.

The flowchart which shows the manufacturing process for obtaining the fireproof processed wood which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The fireproof processed wood according to the present embodiment is a structural material (including wood for 2 × 4 construction method), a base material, an interior material, an exterior material, etc. It is used as a building material, and is formed by containing finely pulverized shells in wood constituent cells and cell gaps. In particular, in the fireproof processed wood according to the present embodiment, oysters or scallop shells are used as the inherently finely powdered shell, and the finely powdered shell is heated and fired. It is said that.

The fireproof processed wood according to the present embodiment can be obtained by the manufacturing method based on the flowchart of FIG.
First, after shellfish shells (oyster shells in the present embodiment) are heated and fired in an electric furnace, the heat-fired shellfish shells are finely pulverized and processed into a fine powder to obtain a finely powdered oyster shell fired product ( Micronization step S1). At this time, the electric furnace is heated and fired at 1200 ° C. for 3 hours. By this pulverization step S1, the shell can be pulverized and heat-sterilized by heating and baking, so that germs and the like can be removed in advance.

  Then, the finely powdered oyster shell fired product obtained in the fine powdering step S1 is put into a solvent such as water, and the finely powdered shell is diffused substantially uniformly in the solution by stirring. A solution (fine powder suspension) having a concentration (in the present embodiment, a concentration of about 5%) is prepared (solution preparation step S2). Agitation of the micronized shell (baked oyster shell) in the solution preparation step S2 is performed by, for example, a microbubble generator (a device capable of generating extremely fine bubbles having a diameter of several μm to about 50 μm or less). Are preferred.

  Thereafter, the wood constituting cells inside the wood are decompressed while immersing the wood to be incombustible or flame retardant in the solution (fine powder suspension) obtained in the solution preparation step S2. And the solution (fine powder suspension obtained in the solution preparation step S2) is infiltrated into the cell gap (immersion step S3). In addition, although the timber which is the object to be incombustible or incombustible is preferably, for example, thinned cedar or straw, other wood may be used.

  More specifically, in the immersing step S3, the solution obtained in the solution preparation step S2 is accommodated in the accommodating space of the sealable container, and the container is sealed in a state where wood is immersed in the solution. . And after sucking the air in a container with a vacuum pump and carrying out vacuum pressure reduction, it returns to a normal pressure at a stretch. By repeatedly performing such vacuum depressurization step and returning to normal pressure, the solution can be substantially uniformly infiltrated into the wood-constituting cells and cell gaps inside the wood.

  After that, the wood obtained in the dipping step S3 (the wood in which the internal wood constituent cells and the cells are soaked with the solution substantially uniformly) is dried by a dryer (for example, dried at about 70 ° C. for about 8 hours) ( Drying step S4). By going through a series of manufacturing processes as described above, it is possible to obtain refractory wood that is more incombustible or flame retardant, and use waste shells to increase waste utilization. Can contribute to environmental measures.

  According to the above embodiment, since the finely crushed shell is contained in the wood constituent cells and the cell gap, the environmental conservation is achieved while suppressing the manufacturing cost by using the shell (so-called marine waste) as the waste. In addition to being able to contribute to the non-flammability or flame retardancy. That is, the main component of the shell (baked shell) is calcium hydroxide, and it can be made more effectively non-flammable and flame retardant by containing wood inside, and as waste. By using this shell, it can contribute to environmental conservation compared with the case of discarding it.

  In particular, according to the present embodiment, the pressure is reduced while immersing wood in the solution obtained in the solution preparation step S2, so that the solution is infiltrated into the wood constituent cells and cell gaps inside the wood, The shell powder can be contained in the wood more reliably and uniformly, and a fireproof processed wood excellent in incombustibility and flame retardancy can be provided. In the dipping step S3, the solution may be soaked into the wood constituent cells and the cell gaps inside the wood more easily and reliably by introducing a dispersant into the solution.

  In addition, since the shell to be finely powdered is composed of a shell of oysters (which may be scallops), it is possible to more effectively promote the use of the shell as waste, and it is incombustible or incombustible. Can increase the sex. In other words, thousands to tens of thousands of tons of oysters and scallops are disposed of as waste every year. Contributing to recycling using such a large amount of waste should further contribute to environmental measures. Can do it.

  Further, according to the present embodiment, since the finely crushed shell is heated and fired, it can be disinfected by heating when the shell is contained in the fire-resistant processed wood, and various bacteria attached to the shell are removed. The sanitary condition can be made favorable. That is, since miscellaneous bacteria such as food poisoning bacteria may adhere to the shell, the bacteria can be removed by heat sterilization by heating and baking in the process of pulverization.

  Here, glue (Nika) or silica gel (either one or both) as an adhesive obtained from animal protein may be introduced into the solution obtained in the solution preparation step S2. In this case, the strength of the fireproof processed wood obtained can be improved and can be used as a building material with high strength. In addition to glue and silica gel, other additives that can improve strength may be introduced into the solution.

Next, the experiment which shows the nonflammable effect or the flame-retardant effect of the fireproof processed wood which concerns on this embodiment is demonstrated.
A 10 cm square piece of wood obtained through the fine powdering step S1, the solution preparation step S2, the dipping step S3, and the drying step S4 is described in Example (Example 1 for oak wood pieces, Example 2 for cedar wood pieces). In addition, a 10 cm square piece of wood that has not been subjected to any processing is subjected to Comparative Examples 1 and 2 (Comparative Example 1 for birch pieces and Comparative Example 2 for cedar pieces), the above-described fine powdering step S1 and solution preparation step S2. 10 cm square pieces of wood obtained by applying the solution obtained on the surface to Comparative Example 3 and 4 (Example 3 for birch pieces and Example 4 for cedar pieces).

  Then, in a windless state, a flame of approximately 1200 ° C. was sprayed on each of Examples 1 and 2 from a burner in a state of being spaced apart by a certain dimension, and the time required to become ignited and burned was measured. Example 1 averaged 41.75 (sec) and Example 2 averaged 15.67 (sec). On the other hand, under the same conditions, flames of approximately 1200 ° C. were sprayed on each of Comparative Examples 1 to 4, and the time required to become ignited and burned was measured. .67 (sec), Comparative Example 2 was 3.67 (sec) on average, Comparative Example 3 was 4.67 (sec) on average, and Comparative Example 4 was 5.67 (sec) on average.

  According to the above experimental results, the wood pieces of Comparative Examples 1 to 4 ignite immediately when a flame of approximately 1200 ° C. is blown, whereas the wood pieces of Examples 1 and 2 ignite for a relatively long time. No flame retardant effect or flame retardant effect is found. In particular, it can be seen that the use of wood made of firewood further enhances the nonflammability effect or the flame retardancy effect. In addition, according to the fire resistance criteria of the Building Standards Act, it is “flammable” if it does not burn for 5 minutes by applying a flame of 750 ° C., “semi-flammable” if it does not burn for 10 minutes, and “nonflammable” if it does not burn for 20 minutes. However, it can be seen that this example has nonflammability under conditions severer than the standard, and is extremely excellent in fire resistance.

  As mentioned above, although this embodiment was described, this invention is not limited to this, For example, shells other than an oyster or a scallop may be sufficient as the shell used. In addition, if fireproof processed wood that can further enhance the incombustibility or flame retardance by containing finely pulverized shells in wood constituent cells and cell gaps, those obtained by other production methods It may be. Furthermore, in the present embodiment, heating and firing are performed in the pulverization step S1, but if the shell can be pulverized to be pulverized, it may not be heated and fired.

  As long as the pulverized shell is contained in the cells constituting the wood and the cell gap, it can be applied to a fire-resistant processed wood and a method for producing the fire-resistant processed wood. it can.

S1 Micronization process S2 Solution preparation process S3 Immersion process S4 Drying process

Claims (6)

In fireproof wood used as building materials such as building structural materials, base materials, interior materials or exterior materials,
A fireproof processed wood characterized in that a finely powdered shell is contained in wood constituent cells and cell gaps.   The fireproof processed wood according to claim 1, wherein the finely pulverized shell is made of oyster or scallop shell.   The fireproof processed wood according to claim 1 or 2, wherein the finely pulverized shell is heated and fired. In the manufacturing method of fireproof processed wood used as a building material such as a structural material of a building, a base material, an interior material or an exterior material,
A pulverization process for pulverizing the shell,
A solution preparation step capable of preparing a solution of a predetermined concentration by diffusing the micronized shell obtained in the fine powder step into a solvent;
A dipping step in which the solution can be soaked into wood constituent cells and cell gaps inside the wood by reducing the pressure while dipping the wood in the solution obtained in the solution preparation step;
A drying step of drying the wood obtained in the soaking step;
A method for producing fireproof processed wood, characterized by obtaining fireproof processed wood by going through.   The method for producing fireproof processed wood according to claim 4, wherein the shell made into a fine powder in the fine powdering step comprises an oyster shell or a scallop shell.   The method for producing fire-resistant processed wood according to claim 4 or 5, wherein the pulverizing step includes heating and firing the shell.

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