Fireproof wooden building member

Abstract

To provide a fireproof wooden building member allowing versatile application for a building through delay of burning upon fire.SOLUTION: A fireproof wooden building member of the present invention is provided with: a wooden substrate; an excelsior board placed on at least a part of a front face, a rear face, and side faces of the wooden substrate; and a coated layer formed on at least a part of a front face and a rear face of the excelsior board. The coated layer has a plurality of hollow ceramics and a resin binder connecting the plurality of hollow ceramics to each other, and the coated layer emits heat applied on at least one of the wooden substrate and the coated layer by changing the heat to a far-infrared ray. A part of components of the coated layer penetrates into the excelsior board.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a wooden building member, specifically a fire-resistant wooden building member having fire resistance.

Background Art

[0002] There are many buildings of various types such as houses, stores, commercial facilities, public facilities, and medical facilities in various places. The materials used for these buildings are selected according to their characteristics, size, use, required specifications, etc. In particular, for structures such as columns, beams, outer walls, inner walls, roofs, and floors of buildings, concrete, new building materials, wood, or combinations thereof are used. Of course, concrete, new building materials, wooden members, or combinations thereof are also used for the foundation and skeleton parts of buildings.

[0003] In addition, materials other than concrete, new building materials, and wooden members may also be used.

[0004] Recently, not only concrete but also new building materials and wooden members are increasingly used for structures such as columns, beams, outer walls, inner walls, roofs, and floors. For example, the use of outer walls and floors made of wooden members is increasing. This is because buildings constructed with wooden members can reduce the environmental load in houses, stores, public facilities, etc.

[0005] In addition, occupants and users can also feel relaxed physically and mentally in buildings made of wooden members. Of course, there are also merits in enhancing the habitability. Buildings made of wooden members have merits such as high adaptability to the outside air temperature (cool in summer and warm in winter indoors) or high adaptability to indoor humidity. Therefore, the convenience for occupants and users is also enhanced.

[0006] In addition, buildings made of wooden members bring a refreshing effect to the mental state of occupants and users. Especially in our country, since wooden buildings have been central in the past, there are high merits for the spirituality of the Japanese people.

[0007] Here, compared with concrete and new building materials, wooden members can be lightweight. If the building members, which are the materials of a building, can be made lightweight, it is possible to reduce the costs of foundation work and construction work. In addition, there is also the merit of being able to shorten the construction period. In addition, compared with concrete and the like, the amount of carbon dioxide emissions in its manufacturing process is reduced, which can contribute to climate change countermeasures.

[0008] Moreover, there is the fact that most of Japan's land is forest. Naturally, there are many trees in many forests, and there is a very large amount of wood raw materials. However, logging trees from Japanese forests to make wood has not progressed from a cost perspective, and there is an aspect where domestic forest resources are not being effectively utilized. In reality, most of the wood used in processed products such as domestic buildings and furniture is imported.

[0009] If the utilization of Japan's forest resources does not progress in this way, there are problems such as the treatment of thinned wood and the replanting of forests not progressing. As a result, the cycle of forest management is not generated, and there is a problem leading to forest degradation.

[0010] In order to utilize the abundant forest resources in Japan, it is necessary for wooden members to be used in a variety of buildings. For example, wooden members may be used in structural parts such as columns, beams, outer walls, inner walls, roofs, and floor surfaces of buildings. By this use, buildings such as houses, stores, facilities, and apartment houses are constructed. If the construction of houses, stores, facilities, apartment houses, etc. using such wooden members spreads, the utilization of Japan's forest resources will progress. In this way, Japan's forest management will be promoted.

[0011] In this way, it is desired that wooden building members be used in many buildings.

[0012] However, wooden building members are considered to burn during a fire and have weak fire response and durability. There are concerns that when a fire occurs, they are likely to be completely burned and spread to the surroundings. Due to such concerns, the use of wooden building members in buildings has not been widespread.

[0013] For this reason, technologies for imparting fire resistance to wooden members have been proposed (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0015] Patent Document 1 discloses a wooden fire-resistant member 1 including a load-bearing part 2, a fire-resistant coating layer 3 covering the periphery of the load-bearing part 2, and a finishing wood layer 4 provided around the outside of the fire-resistant coating layer 3, wherein the fire-resistant coating layer 3 is made of a wet fire-resistant coating material, and a moisture barrier layer 5 is formed between the load-bearing part 2 and the fire-resistant coating layer 3 and between the fire-resistant coating layer 3 and the finishing wood layer 4.

[0016] Patent Document 1 aims to prevent the demerits caused by moisture impregnation in fire-resistant wood by providing a moisture barrier layer such as a moisture barrier sheet.

[0017] However, in Patent Document 1, the fire-resistant coating layer is realized by spraying materials such as rock wool and white cement. The coating layer made of such materials has a problem that it requires a certain thickness to enhance the fire resistance, resulting in an increase in weight. That is, the weight of the wooden fire-resistant member increases. When the weight of a building member such as a wooden fire-resistant member increases, not only does the scale of the foundation work become larger, but also the processes and labor of the construction work itself increase, leading to an increase in construction costs. There is also a concern about a decrease in safety during construction work.

[0018] Also, similar to gypsum board, etc., the coating layer formed by spraying materials such as rock wool can gain time until the coating layer burns during a fire. However, once the coating layer starts burning, the wood will burn all at once. This is because when heat from the fire is applied, the mechanism of heat rise comes into play.

[0019] Patent Document 2 discloses that a fire-resistant wood 10 includes a prismatic core material 12 made of a wooden material, a heat buffer material 14A attached to the corners of the core material 12, a fire-resistant material 18A attached to the outer surface side of the core material 12, and a finishing material 20 supported by the heat buffer material 14A and covering the fire-resistant material 18A and the heat buffer material 14A.

[0020] The technology of Patent Document 2 forms a complex structure for fire resistance. However, it is necessary to form a complex structure, which increases the labor and cost of processing and is not suitable for many buildings. The construction cost also increases, and it is difficult to handle, making the construction work difficult.

[0021] In addition, due to its complex shape, it is also difficult to be suitable for wall materials, floor materials, etc. in a building. Also, the fire resistance is realized by providing a heat buffer material inside. However, despite the fact that the temperature of the entire fire-resistant wood rises due to the heat of the fire, the fire-resistant wood will burn due to the temperature rise.

[0022] Patent Documents 1 and 2 only focus on weakening combustion in a fire by incorporating some materials that are difficult to burn, unlike wood. In reality, if the temperature rise cannot be suppressed, the fire-resistant wood will surely burn during a fire.

[0023] Patent Document 3 discloses a fire-resistant modified wood material in which a plurality of unit woods 14 are joined and impregnated with a non-combustible agent for performing a non-combustible, semi-non-combustible or flame-retardant treatment on the wood material. The unit wood 14 is arranged such that its end face k becomes the front and back sides in the thickness direction of the fire-resistant modified wood material 16, and a fire-resistant modified wood impregnated with a non-combustible agent injected from the end face k is disclosed.

[0024] Patent Document 3 has problems that the cost as a building material becomes extremely high in order to cope with fire resistance during wood processing. Also, it is difficult to secure the distribution volume, and there is a problem that it is difficult to use in many buildings. In addition, since the utilization is biased towards specific parts of the wood, it becomes difficult to effectively utilize forest resources. Also, due to being based on impregnation, there is a problem that the weight increases and the construction cost becomes high.

[0025] Moreover, since it is a building material injected with a chemical agent, there is also a concern that residents and the like may be affected by gasification after the building is completed. There is also a concern that some affected gas may be generated during a fire.

[0026] The prior art has problems such as (1) the weight increases, increasing the building material cost and the construction cost, (2) causing construction labor, (3) being difficult to achieve delaying combustion during a fire, and (4) poor usability due to the complexity of the structure of the building material.

[0027] In view of these problems, an object of the present invention is to provide a fire-resistant wooden building member that can be widely used in buildings by delaying combustion during a fire.

Means for Solving the Problems

[0028] The fire-resistant wooden building member of the present invention includes a wooden base material, A wood wool cement board provided on at least a part of the front, back, and side surfaces of the wooden base material, and a coating layer formed on at least a part of the front and back surfaces of the wood wool cement board, wherein the coating layer, comprises a plurality of hollow ceramics, and a resin binder connecting the plurality of hollow ceramics to each other, and has, the coating layer converts heat applied to at least one of the wooden base material and the coating layer into far-infrared rays and radiates them, and a part of the components of the coating layer has penetrated into the wood wool cement board.

Advantages of the Invention

[0029] The fire-resistant wooden building member of the present invention can enhance the fire-resistant ability by providing the wooden base material with a wood wool cement board and a coating layer. In addition, compared with the case of using a gypsum board as in the prior art, the amount of carbon dioxide emissions in the manufacturing stage is small. This is because more carbon dioxide is emitted in the manufacturing process of the gypsum board compared with the wood wool cement.

[0030] In addition, since the wood wool cement uses wood as one of the raw materials, the proportion of utilization of forest resources can be increased. As a result, it conforms to green procurement and the like.

[0031] Also, the increase in weight can be minimized, and an increase in construction costs and construction labor can be suppressed.

[0032] In addition, the coating layer does not exhibit fire resistance physically or chemically, but converts heat due to a fire or the like into far-infrared rays and radiates them. Thereby, an increase in the temperature of the building member due to heat such as a fire can be suppressed. By suppressing this increase in temperature, the combustion during a fire can be delayed, and the fire-resistant ability that a wooden building should have can be enhanced.

[0033] At this time, the material of the coating layer penetrates into the wood wool cement board. As a result, the thickness of the coating layer increases. The increase in this thickness enhances the far-infrared conversion effect by the coating layer and improves the fire resistance ability. As a result, the fire-resistant wooden building member can be used in various buildings.

Brief Description of the Drawings

[0034]

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Embodiment for Carrying Out the Invention

[0035] The fire-resistant wooden building member according to the first invention of the present invention includes a wooden base material and, a wood wool cement board provided on at least a part of the front surface, back surface, and side surfaces of the wooden base material, and a coating layer formed on at least a part of the front surface and back surface of the wood wool cement board. The coating layer includes a plurality of hollow ceramics, and a resin binder that connects the plurality of hollow ceramics to each other. It has the coating layer converts heat applied to at least one of the wooden base material and the coating layer into far-infrared rays and radiates it, and a part of the components of the coating layer has penetrated into the wood wool cement board.

[0036] With this configuration, the thickness and volume of the coating layer that exhibits the ability to convert and radiate the applied heat into far-infrared rays increase, and the fire resistance ability is enhanced.

[0037] In the fire-resistant wooden building member according to the second invention of the present invention, in addition to the first invention, the coating layer has an impregnated layer that has penetrated into the wood wool cement board, and a surface layer on the surface of the wood wool cement board.

[0038] With this configuration, the thickness and volume of the coating layer increase, and the fire resistance ability is enhanced. Also, since the impregnated layer is less likely to be damaged during a fire or the like, the ability to perform far-infrared conversion and radiation can be maintained for a long time.

[0039] In the fire-resistant wooden building member according to the third invention of the present invention, in addition to the second invention, the impregnated layer is formed by impregnation when the material of the coating layer is applied to the wood wool cement board.

[0040] With this configuration, the impregnated layer can be formed by taking advantage of the characteristics of the wood wool cement board.

[0041] In the fire-resistant wooden building member according to the fourth invention of the present invention, in addition to the first invention, the coating layer is provided on the front and back surfaces of the wood wool cement board.

[0042] With this configuration, the fire resistance is further enhanced.

[0043] In the fire-resistant wooden building member according to the fifth invention of the present invention, in addition to the first invention, the plurality of hollow ceramics include hollow ceramics of a plurality of different particle sizes. The particle sizes of the plurality of hollow ceramics are 10 μm to 150 μm. The average particle size of the plurality of hollow semilax is 40 μm.

[0044] With this configuration, due to the variation in particle size, heat containing various components can be efficiently and reliably converted into far-infrared rays. Thereby, the fire resistance can be enhanced. In addition, the formation of the coating layer can be surely performed.

[0045] In the fire-resistant wooden building member according to the sixth invention of the present invention, in addition to the first invention, the hollow ceramics contain a metal oxide. The metal oxide includes at least one of aluminum oxide (Al2O3), magnesium oxide (MgO), ferric oxide (Fe2O3), sodium oxide (Na2O), potassium oxide (K2O), titanium oxide (TiO2), cerium oxide (CeO2), silicon dioxide (SiO2), and antimony trioxide (Sb2O3).

[0046] With this configuration, the conversion into far-infrared rays can be efficiently performed.

[0047] In the fire-resistant wooden building member according to the seventh invention of the present invention, in addition to the first invention, the hollow ceramics have an outer surface and an internal space. In at least one of the conversion of the outer surface into far-infrared rays and the conversion of far-infrared rays by diffuse reflection in the internal space, the heat applied to at least one of the wooden base material and the coating layer is converted into far-infrared rays.

[0048] With this configuration, conversion to far-infrared rays can be efficiently performed.

[0049] In the fire-resistant wooden building member according to the eighth invention of the present invention, in addition to the first invention, the resin binder includes an acrylic silicone resin and an acrylic resin, The acrylic resin has a higher content in the coating layer than the acrylic silicone resin.

[0050] With this configuration, the viscosity of the material of the coating layer decreases, and it becomes easier to penetrate into the wood wool cement board when applying. As a result, a sufficient penetration layer can be formed.

[0051] In the fire-resistant wooden building member according to the ninth invention of the present invention, in addition to the first invention, the thickness of the wood wool cement board is smaller than the thickness of the wooden base material.

[0052] With this configuration, it is possible to exhibit fire resistance while suppressing weight increase.

[0053] In the fire-resistant wooden building member according to the tenth invention of the present invention, in addition to the first invention, a decorative board is further provided outside the wood wool cement board.

[0054] With this configuration, the appearance can be made more attractive.

[0055] In the fire-resistant wooden building member according to the eleventh invention of the present invention, in addition to the first invention, at least a part of the hollow ceramics is broken into a flat plate shape to form a protective film when the temperature reaches a predetermined temperature or higher.

[0056] With this configuration, it is possible to prevent the intrusion of flames and heat, prevent the temperature rise from the intrusion site, and enhance the fire resistance.

[0057] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0058] (Embodiment 1)

[0059] (Analysis by the inventor) Regarding fire-resistant wooden building members, the inventor conducted various analyses and arrived at the following analysis for fire-resistant wooden building members.

[0060] (Problems of gypsum board) As a fire-resistant wooden building member, gypsum board is often used. The gypsum board is attached to the wooden base material to utilize the fire-resistant function of the gypsum board. However, the gypsum board is a mechanism that requires a combustion time due to the applied heat, and there is no change in the fact that combustion directly occurs due to heat. It does not have a mechanism such as reducing the part leading from heat to combustion. That is, it depends on the thickness and size of the gypsum board.

[0061] Also, the gypsum board is heavy. For this reason, when combined with a wooden base material or a decorative material, etc., the thickness and weight increase, and there is also a problem that the construction cost of the building increases. Furthermore, the weight of the building increases, causing various adverse effects.

[0062] This is the same for metal boards for fire resistance instead of gypsum boards.

[0063] (Problems when forming a coating layer on a wooden base material)

[0064] Improving the fire resistance by directly forming a coating layer on the wooden base material has also been considered. For example, the coating layer can suppress the heat conduction and temperature rise to the wooden base material by reflecting or converting the applied heat, etc., and delay the combustion of the wooden base material.

[0065] This is due to the mechanism of the coating layer. The combustion is delayed by utilizing this mechanism.

[0066] However, when directly forming a coating layer on the wooden base material, there are limits to the thickness and volume of the coating layer. For this reason, there are limits to the absolute amount of the ability to reflect or convert heat, etc. Due to this limit of the absolute amount, there is a limit to delaying the combustion of the wooden base material. For this reason, there was a problem that it was difficult to achieve a fire resistance above a certain level.

[0067] Based on these analyses, the inventor has made the present invention that can solve the following problems.

[0068] (1) Prevent increasing the weight and thickness, such as in the case of gypsum boards and metal boards.

[0069] (2) While realizing (1), increase the volume and thickness of the coating layer that generates the fire resistance mechanism to enhance the fire resistance.

[0070] (Overall Outline) Describe the overall outline of the fire-resistant wooden building member in Embodiment 1.

[0071] The fire-resistant wooden building member 1 is used for structural parts such as columns, beams, outer walls, inner walls, roofs, and floor surfaces of wooden buildings. Alternatively, it is also used for structural parts such as columns, beams, outer walls, inner walls, roofs, and floor surfaces of buildings with a partial wooden structure (buildings where wooden parts are mixed with concrete or other materials). At this time, the fire-resistant wooden building member 1 may be used for all or part of these structural parts such as columns, beams, outer walls, inner walls, roofs, and floor surfaces.

[0072] For example, in order to delay the burning of the building during a fire, the fire-resistant wooden building member 1 may be used for the outer walls and inner walls, and general wooden building materials may be used for other parts.

[0073] The purpose of the fire-resistant wooden building member 1 is not to prevent it from burning at all when a fire occurs in a wooden building, but to delay the burning time. In building standards and the like, it is also important not to prevent it from burning at all when a fire occurs in a wooden building (and its surroundings), but to delay the burning. For example, increasing the time required for the outer wall to burn down is one of the safety standards for wooden buildings.

[0074] Therefore, the fire-resistant wooden building member 1 can delay burning in the event of a fire or the like.

[0075] FIG. 1 is a side view of the fire-resistant wooden building member according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of a part of the fire-resistant wooden building member according to Embodiment 1 of the present invention. Both are shown for easy understanding of the configuration. For example, in FIG. 2, the impregnated layer 41 and the surface layer 42, which will be described later, are originally connected, but are shown in a separated state for facilitating understanding of the configuration. This is for easy understanding of the connection in actuality.

[0076] The fire-resistant wooden building member 1 includes a wooden base material 2, a wood-wool cement board 3, and a coating layer 4. The wooden base material 2 is made of wood and is a basic element of the building member. Since the fire-resistant wooden building member 1 is used to build a wooden building, the wooden base material 2 is a basic element.

[0077] For the wooden base material 2, various woods such as cedar and cypress may be used. The shape, size, thickness, etc. may be selected according to whether it is used for any of the structural parts such as columns, beams, outer walls, inner walls, roofs, and floor surfaces.

[0078] The wood-wool cement board 3 is provided on at least a part of the front surface, back surface, and side surface of the wooden base material 2. In FIG. 1, as an example, the wood-wool cement board 3 is provided on the front surface of the wooden base material 2.

[0079] The coating layer 4 is formed on at least a part of the front surface and the back surface of the wood-wool cement board 3. By providing the coating layer 4, fire resistance is realized as will be described later. In FIG. 1, as an example, a state is shown in which the coating layer 4 is formed on each of the front surface and the back surface of the wood-wool cement board 3.

[0080] The coating layer 4 is a material that can be applied to the wood-wool cement board 3 as will be described later, and is formed by application and drying and solidification.

[0081] The coating layer 4 has a plurality of hollow ceramics and a resin binder that connects the plurality of hollow ceramics to each other. With such a configuration, the coating layer 4 converts the heat applied to at least a part of the wooden base material 2, the wood wool cement board 3, and the coating layer 4 into far-infrared rays and radiates them. By converting the applied heat into far-infrared rays and radiating it, even if heat is generated due to a fire or the like, the amount of heat applied to the wooden base material 2 decreases. Since the applied heat becomes far-infrared rays and is radiated to the outside, the amount of heat applied to the wooden base material 2 decreases, and the combustion of the wooden base material 2 is suppressed.

[0082] If the combustion of the wooden base material 2 is suppressed, the time until the wooden base material 2 burns down becomes longer in the event of a fire or the like. Fire resistance does not mean not burning at all, but rather that the time until it burns down (burns out) is a certain time or longer and that it self-extinguishes. For example, in building codes and the like, when a predetermined amount of heat is generated, it is defined as a fire resistance standard that it is prevented from burning out for a certain time (for example, 1 hour) or longer and that it self-extinguishes.

[0083] If the maintenance until burning out for this certain time or longer and self-extinguishing are realized, evacuation and fire extinguishing activities are possible in the event of a fire. This is fire resistance, and it is realized by the far-infrared conversion of the coating layer 4.

[0084] FIG. 3 and FIG. 4 are schematic diagrams showing the mechanism of far-infrared conversion by the coating layer in Embodiment 1 of the present invention. The coating layer 4 includes hollow ceramics 400 and a resin binder 410. When a fire or the like occurs, heat is applied to the wooden base material 2, the wood wool cement board 3, the coating layer 4, and the like. In FIG. 3, the arrows Y1 and Y2 indicate the directions in which heat is applied.

[0085] When heat is applied, the hollow ceramics 400 convert it into far-infrared rays and radiate it to the outside. As a result, the heat applied is reduced in the amount used to burn the wooden base material 2. Since a part of the applied amount of heat becomes far-infrared rays and is radiated to the outside, the amount of heat for burning the wooden base material 2 decreases, and the combustion of the wooden base material 2 can be delayed.

[0086] The coating layer 4 includes a plurality of hollow ceramics 400. The hollow ceramics 400 has an internal space 420. The internal space 420 converts the applied heat into far-infrared rays by diffusely reflecting the heat inside it.

[0087] Figure 4 shows the state where the hollow ceramics converts heat into far-infrared rays. As shown in Figure 4, the heat applied in the internal space 420 diffusely reflects. Through this diffuse reflection, the heat is converted into far-infrared rays. The converted far-infrared rays are radiated.

[0088] By such a mechanism, the applied heat is continuously converted into far-infrared rays and radiated. As a result, the amount of heat that burns the wooden base material 2 is suppressed, and the time until it burns down becomes longer.

[0089] Here, a part of the coating layer 4 penetrates into the wood-wool cement board 3. In Figure 1 and the like, this penetrated state is shown. As described above, the coating layer 4 is formed of a material that can be applied. The wood-wool cement board 3 has absorbency with internal air bubbles, and can penetrate into the interior from the surface of the wood-wool cement board 3 when the material of the coating layer 4 is applied.

[0090] Due to this penetration, the coating layer 4 has a configuration as shown in Figure 2. That is, the coating layer 4 includes an infiltrated layer 41 that penetrates into the wood-wool cement board 3 and a surface layer 42 on the surface of the wood-wool cement board 3. In Figure 2, the infiltrated layer 41 and the surface layer 42 are shown as being separated, but they are actually connected, and are shown in this way for clarity.

[0091] As a result, the thickness and volume of the coating layer 4 become larger compared to the case where it can be formed only on the surface. That is, the volume amount as the coating layer 4 becomes larger. Since the coating layer 4 is formed by coating, if it can be formed only on the surface, there is a limit to its volume amount. On the other hand, by being provided on the wood-wool cement board 3, the infiltrated layer 41 and the surface layer 42 are formed, and the volume amount becomes larger.

[0092] As described above, the coating layer 4 converts heat into far-infrared rays and radiates them. The large volume of the coating layer 4 that exhibits this mechanism further enhances the fire resistance ability. In addition, the fire resistance function of the wood wool cement board 3 itself is also added, which can highly suppress the combustion of the wooden base material 2.

[0093] As described with reference to FIGS. 3 and 4, the coating layer 4 converts the heat added by the contained hollow ceramics 400 into far-infrared rays and radiates them to the outside. The volume of the coating layer 4 is larger due to the impregnation layer 41 than when the coating layer 4 is formed only on the surface of the wooden base material 2 or only on the surface of the gypsum board or metal board connected to the wooden base material 2. That is, the amount of the contained hollow ceramics 400 also increases.

[0094] In this way, since the wood wool cement board 3 has absorbency such as air bubbles, the impregnation layer 41 can be formed when the coating layer 4 is formed. This is because when the material of the coating layer 4 is applied to the wood wool cement board 3, this material penetrates and becomes the impregnation layer 41. Of course, since a coating layer also remains on the surface, the surface layer 42 is also formed. In this way, a form is provided with the surface layer 42 and the impregnation layer 41.

[0095] In this way, the large thickness and volume of the coating layer 4 increase the far-infrared conversion ability (the amount of time the ability and function can be exhibited) and the fire resistance ability.

[0096] In addition, there is also an advantage that the thickness and weight can be reduced compared to the case of using a gypsum board or a metal board as in the prior art.

[0097] In addition, the coating layer 4 may be provided only on the front surface, only on the back surface, or on both the front and back surfaces of the wood wool cement board 3. By forming the coating layer 4 with various variations, an improvement in fire resistance can be achieved.

[0098] Next, the details and variations of each part will be described.

[0099] (Coating layer) As described above, the coating layer 4 can convert heat into far-infrared rays by including a plurality of hollow ceramics 400.

[0100] Also, it is preferable that the plurality of hollow ceramics 400 included in the coating layer 4 include hollow ceramics 400 having different particle sizes. Due to the different particle sizes, more diffuse reflection occurs in the respective internal spaces 420 of the hollow ceramics 400. Also, diffuse reflection between the hollow ceramics 400 having different particle sizes is added, and the conversion of heat into far-infrared rays occurs more effectively.

[0101] Moreover, the heat applied includes components of different wavelengths. Each of these components of different wavelengths corresponds to hollow ceramics 400 having different particle sizes. Due to this correspondence, hollow ceramics 400 of a certain particle size convert heat of a certain wavelength component into far-infrared rays. Hollow ceramics 400 of another particle size convert heat of another wavelength component into far-infrared rays.

[0102] In this way, by including hollow ceramics 400 of different particle sizes, the applied heat can be efficiently and surely converted into far-infrared rays. When hollow ceramics 400 of different particle sizes are included, the entire heat having components of different wavelengths can be converted into far-infrared rays. Thereby, even when heat such as a fire is applied to the fire-resistant wooden building member 1, it is possible to more surely delay combustion.

[0103] Also, the hollow ceramics 400 also exhibit a mechanism of generating far-infrared rays by the conversion of heat on its surface and radiating this. When heat is applied, the surface of the hollow ceramics 400 converts this into far-infrared rays. Thereby, the coating layer 4 can successively convert the applied heat into far-infrared rays and radiate it. Thereby, even when heat such as a fire is applied to the fire-resistant wooden building member 1, combustion can be delayed.

[0104] From this point of view, it is preferable that the coating layer 4 contains hollow ceramics 400 with different particle sizes. By including hollow ceramics 400 with different particle sizes, the packing density of the hollow ceramics 400 in the coating layer 4 increases. This is because the hollow ceramics 400 with medium or small particle sizes enter the gaps formed between the hollow ceramics 400 with large particle sizes.

[0105] As a result, the number density of the hollow ceramics 400 contained in the coating layer 4 increases.

[0106] If the number density increases, the total surface area of the contained hollow ceramics 400 increases. As described above, the hollow ceramics 400 convert heat into far-infrared rays on their surfaces. With the increase in the total surface area of this entire surface, the amount of conversion into far-infrared rays increases. Combined with the increase in the surface area and volume, the far-infrared conversion ability of the coating layer 4 increases, and the fire resistance ability further increases.

[0107] Thus, the coating layer 4 containing hollow ceramics 400 with different particle sizes contributes to the improvement of the ability to convert heat into far-infrared rays.

[0108] Here, it is also preferable that the particle sizes of the plurality of hollow ceramics 400 are 10 μm to 150 μm. It is also preferable that the average particle size is 40 μm.

[0109] With the particle sizes of the hollow ceramics 400 being in such a wide range, the applied heat can be reliably and efficiently converted into far-infrared rays. Depending on the heat, the wavelengths included are also various, but the fact that the particle sizes of the hollow ceramics 400 vary within such a wide range enables the conversion into far-infrared rays for any wavelength of heat or component.

[0110] In addition, when the average particle size is 40 μm, the formation of the coating layer 4 becomes easy. The coating layer 4 may be formed by applying a paint containing the hollow ceramics 400 and the resin binder 410 to the surface of the wood wool cement board 3 or the like. In this case, when the average particle size of the hollow ceramics 400 is 40 μm, there is an advantage that application and the like become easy. There is also an advantage that a coating layer 4 with an appropriate thickness can be formed.

[0111] It is also preferable that the hollow ceramics 400 contain a metal oxide. By containing such a metal oxide, heat can be efficiently converted into far-infrared rays. Here, the metal oxide contains at least one of aluminum oxide (Al2O3), magnesium oxide (MgO), ferric oxide (Fe2O3), sodium oxide (Na2O), potassium oxide (K2O), titanium dioxide (TiO2), cerium oxide (CeO2), silicon dioxide (SiO2), and antimony trioxide (Sb2O3).

[0112] By containing these metal oxides, the hollow ceramics 400 can efficiently and surely convert heat into far-infrared rays. The metal oxide promotes diffuse reflection in the internal space 420 and generates far-infrared rays during the process of diffuse reflection. In this way, the coating layer 4 containing the hollow ceramics 400 containing the metal oxide can efficiently and surely convert the heat applied to the fire-resistant wooden building member 1 into far-infrared rays.

[0113] In addition, since the hollow ceramics 400 contain a metal oxide, the ability and efficiency of far-infrared conversion by the hollow ceramics 400 are enhanced. As described above, the hollow ceramics 400 convert heat into far-infrared rays and radiate them by diffuse reflection in its internal space and conversion at the surface.

[0114] When the hollow ceramics 400 contain a metal oxide, the conversion effect into this far-infrared ray can be enhanced. That is, the amount of far-infrared rays radiated by the hollow ceramics 400 can be increased. In addition to the hollow ceramics 400 being hollow and having a plurality of particle sizes, by containing a metal oxide, heat can be efficiently converted and radiated into far-infrared rays.

[0115] In addition, the hollow ceramics 400 has an outer surface and an internal space 420. At this time, the heat applied to the outer surface is converted into far-infrared rays. Similarly, conversion into far-infrared rays can be achieved by diffuse reflection in the internal space 420. By exerting both of these functions, the applied heat is effectively converted into far-infrared rays.

[0116] (Resin binder) The resin binder 410 connects the plurality of hollow ceramics 400 to each other. By connecting them, the coating layer 4 can be formed as one layer.

[0117] The resin binder 410 contains an acrylic silicone resin and an acrylic resin, and the content of the acrylic resin is higher than that of the acrylic silicone resin. This is because, being an acrylic resin, the resin binder 410 can surely connect the hollow ceramics 400 to each other.

[0118] In addition, by containing the acrylic silicone resin and the acrylic resin in the above composition, the viscosity of the coating layer 4 at the material stage during the coating process can be reduced to a certain extent. Since the viscosity is low to a certain extent, the material easily penetrates into the wood wool cement board 3 when the material is applied. Since it becomes easier to penetrate, the volume and thickness of the coating layer 4 composed of the penetration layer 41 and the surface layer 42 increase.

[0119] In particular, in order to increase the thickness and volume of the coating layer 4, it is necessary for the penetration layer 41 to be of sufficient size. This is because there is a limit to the increase in the thickness of the surface layer 42. In this regard, it is preferable that the penetration amount increases by devising the composition of the resin binder 410.

[0120] In addition, being an acrylic resin can also achieve weight reduction of the coating layer 4.

[0121] (Wood wool cement board) The wood wool cement board 3 is a building material obtained by shaving wood into long and narrow ribbons and compression molding with cement paste. That is, it is a building material mainly composed of wood, different from metal boards and concrete. Since it is mainly composed of wood, the use of waste wood and thinned wood is promoted.

[0122] The wood wool cement board 3 has a certain fire resistance by itself. In addition, since it has absorbency, it can be impregnated when the material of the coating layer 4 is applied to form an impregnated layer 41. By having these on the surface of the wooden base material 2 etc., high fire resistance can be realized.

[0123] Fig. 5 is a schematic diagram of the wood wool cement board 3. Fig. 6 is a schematic diagram of the wood wool cement board with a coating layer applied. The wood wool cement board 3 is compression molded by shaving wood into long and narrow ribbons. For this reason, as shown in Fig. 5, it has air bubbles and fiber spaces. For this reason, when the material of the coating layer 4 is applied, this material penetrates into the wood wool cement board 3. Thus, when the coating layer 4 is formed, an impregnated layer 41 and a surface layer 42 are formed.

[0124] Fig. 6 shows a state in which this impregnated layer 41 and surface layer 42 are formed. In this way, the thickness and volume amount of the coating layer 4 can be increased, and the fire resistance can be enhanced.

[0125] Also, the weight per unit volume of the wood wool cement board is smaller than that of the gypsum board.

[0126] Fig. 7 is a table showing the weight comparison between the wood wool cement board and the gypsum board. As shown in Fig. 7, the weight per unit volume of the wood wool cement board is 603.79 Kg / m3, while the gypsum board is 781.48 Kg / m3. That is, a wooden building member using a gypsum board for fire resistance is heavier than the fire-resistant wooden building member of the present invention. This increases the construction cost and the danger during construction.

[0127] In this regard, the present invention can also solve problem (1) in the inventor's analysis. Of course, since it realizes fire resistance, it can also solve (2).

[0128] Here, the thickness of the lath cement board 3 is smaller than the thickness of the wooden base material 2. Thereby, an increase in the thickness and weight of the fire-resistant wooden building member 1 can be suppressed.

[0129] It is also preferable to further provide a decorative board outside the lath cement board 3. Thereby, the appearance and aesthetics can be enhanced.

[0130] As described above, the fire-resistant wooden building member 1 in Embodiment 1 can increase the thickness and volume of the coating layer 4, and can achieve high fire resistance.

[0131] (Embodiment 2)

[0132] (Embodiment 3)

[0133] By using the fire-resistant wooden building member 1 described in Embodiments 1 and 2 in a building, a wooden building excellent in fire resistance can be realized. At this time, the fire-resistant wooden building member 1 may be used partially or entirely. Alternatively, the use of concrete or the like in part is not excluded.

[0134] Buildings include various types such as houses, low-rise buildings, warehouses, stores, temples, and shrines. Also, in these buildings, the fire-resistant wooden building member 1 is used for structural parts such as columns, beams, outer walls, inner walls, roofs, and floor surfaces. It may be used for all of these or for some of them.

[0135] The fire-resistant wooden building member 1 has fire resistance. For example, it can withstand for a certain period of time or more before burning down in the event of a fire. Thereby, evacuation is possible in the event of a fire, and fire extinguishing activities are also facilitated, and total combustion and spread of fire can be prevented.

[0136] As described above, the fire resistance in a wooden building (the same applies to other buildings) does not mean not burning at all, but rather sufficiently delaying combustion and allowing natural extinction. If combustion can be delayed, evacuation and fire extinguishing can be realized.

[0137] In addition, since the wood wool cement board 3 is mainly made of wood, the fire-resistant wooden building member 1 can be mainly composed of wood in combination with the wooden base material 2. This is different from gypsum boards and metal boards. Of course, it is also different from concrete buildings. This enables the effective utilization of Japan's forest resources.

[0138] In Japan, appropriate logging in forests has not been carried out, and the utilization of thinned wood has not been possible either. If this is left unattended, Japan's forestry will decline and the deforestation of forests will also progress. The fire-resistant wooden building member 1 of the present invention can also address such problems. It can utilize Japan's unutilized forest resources and also contribute to the protection of Japan's forests.

[0139] (Embodiment 3)

[0140] Next, Embodiment 3 will be described. In Embodiment 3, the experimental results for confirming the fire resistance of the fire-resistant wooden building member of the present invention will be described. (Experiment 1) The fire resistance of the fire-resistant wooden building member (Example) having the configuration of the present invention was compared with the configuration (Comparative Example 1: wooden base material + wood wool cement) without a coating layer from the configuration of the present invention.

[0141] (Experimental method) FIG. 8 is a schematic diagram of a combustion experiment method for confirming the fire resistance in Embodiment 3 of the present invention. It has the elements of the fire-resistant wooden building member, and actually applies combustion heat to measure the state of temperature rise. If the temperature rise is suppressed, it can be determined that the fire resistance is being exhibited (compared with the comparative example).

[0142] In the combustion experiment shown in FIG. 8, as the fire-resistant wooden building member, coating layers are provided on both sides of the wood wool cement board. Furthermore, it includes a wooden base material and a veneer board as the kindling for measuring the temperature rise. The fire-resistant wooden building member as an example has such a configuration. In this experiment, it was confirmed that the temperature rise due to combustion heating is suppressed by the wood wool cement board provided with the coating layer.

[0143] As shown in Fig. 8, the fire-resistant wooden building member which is an example is fixed to a structure composed of bricks and columns. Combustion heat is applied with a burner from the surface without veneer of this fire-resistant wooden detection member. By measuring the temperature rise of the veneer which is the wooden base material on the opposite surface and grasping the state of the temperature rise, a combustion experiment was conducted.

[0144] Also, for Comparative Example 1 without a coating layer (a comparative example for confirming the fire resistance of the fire-resistant wooden building member, which does not have a fire-resistant configuration as in the present invention), a combustion experiment was conducted by the experimental method of Fig. 8.

[0145] Fig. 9 is a photograph showing the side where combustion is imparted by the burner in the combustion experiment in Embodiment 3 of the present invention. Fig. 10 is a photograph showing the veneer side by the burner in the combustion experiment in Embodiment 3 of the present invention. By measuring the temperature at the beginning on the veneer side of Fig. 10, the fire resistance can be grasped.

[0146] Here, the combustion heating by the burner as shown in Fig. 9 is performed based on the ISO heating curve as shown in Fig. 11. Fig. 11 is a graph showing the standard fire temperature curve defined in ISO834 and a photograph showing that a combustion experiment was conducted based on this.

[0147] The heating by the burner is controlled so as to match the temperature rise corresponding to the temperature curve according to such ISO834 (the graph on the right side of Fig. 11), and heat is applied. In response to this application of heat, the temperature rise on the opposite surface (the surface with the veneer) was measured. In Fig. 8 etc., the fire-resistant wooden building member which is an example is shown, but as described above, a similar experiment was conducted using a building member without the fire-resistant element of the present invention as Comparative Example 1. By comparing the temperature rises of this example and Comparative Example 1, the fire resistance of the fire-resistant wooden building member of the present invention which is an example can be confirmed.

[0148] Figure 12 is a graph showing the combustion test results of the fire-resistant wooden building member of the embodiment shown in Figure 8 and Comparative Example 1. In the fire-resistant wooden building member of the embodiment, the temperature of the back surface after 30 minutes of heating is 98.4°C. For the wood wool cement board + veneer without the coating layer in Comparative Example 1, the temperature of the back surface after 30 minutes of heating has risen to 216.3°C. That is, it was confirmed that the fire-resistant wooden building member, which is an embodiment provided with a coating layer, greatly suppresses the temperature rise in the wooden base material.

[0149] As a result, the time until the wooden base material burns down can be greatly extended. Even if a fire breaks out in a building where the fire-resistant wooden building member is used, sufficient evacuation time and fire extinguishing time can be ensured, and by natural fire extinguishment, the safety can be enhanced and the spread of fire to the surroundings can be prevented. That is, a wooden building with high fire resistance can be realized.

[0150] This point was confirmed through the combustion test. (Experiment 2) Also, based on the experimental methods shown in Figures 8 to 11, experiments were conducted on the fire-resistant wooden building member (embodiment) having the configuration of the present invention and a plurality of other types of comparative examples. Based on these experiments, it was confirmed that the temperature rise of the embodiment is suppressed with respect to the comparative examples having various configurations. In particular, in Experiment 2, a high contribution of the formation of the coating layer on the wood wool cement was confirmed in realizing the fire resistance of the wooden base material.

[0151] That is, the difference in fire resistance between the fire-resistant wooden building member having the configuration of the present invention in which the wood wool cement is provided on the wooden base material and the coating layer is formed on this wood wool cement, and the comparative examples having various configurations in which the coating layer is provided but the coating layer is not provided on the wood wool cement was confirmed in Experiment 2. The comparative examples are as follows. The coating layer is the coating layer described in Embodiments 1 and 2, and is equivalent between the embodiment and the comparative examples.

[0152] Comparative Example A: Wooden base material (plywood) + coating layer (the coating layer is formed on the wooden base material) Comparative Example B: Wooden base material (plywood) + aluminum thin plate + coating layer (the coating layer is formed on the aluminum thin plate) Comparative Example C: Wooden base material (plywood) + gypsum board + coating layer (the coating layer is formed on the gypsum board) Comparative Example D: Equivalent to Comparative Example 1 of Experiment 1, wooden base material + wood wool cement Example: Fire-resistant wooden building member having the configuration of the present invention

[0153] The experimental method was the same as in the case of Experiment 1 as described above. For each of the comparative examples and examples, heat was applied using a heating burner, and the time required for the temperature to rise to 90°C was measured. The shorter this required time, the lower the fire resistance ability, and the longer the time, the higher the fire resistance ability. In the application of heat by the heating burner, heating was performed at a constant heating temperature of about 850°C.

[0154] (Experimental results) Table 1 is a table showing the experimental results of Experiment 2.

[0155]

Table 1

[0156] In Table 1, the elapsed time and temperature rise from the application of heat by burner heating are recorded. The vertical axis of Table 1 indicates the elapsed time (unit: minutes). It shows the time for each of the comparative examples and examples to rise to 90°C. Figure 13 is a graph of Table 1. The horizontal axis of the graph in Figure 13 is the elapsed time, and the vertical axis indicates the temperature.

[0157] The results of each Experiment 2 in Table 1 are as follows. Note that the plywood in Table 1 and the graph is a wooden base material made from domestic coniferous trees (such as larch, spruce, cedar, red pine, etc.).

[0158] (Comparative Example A) In Comparative Example A, a high temperature rise occurred after the start of heating, and it rose to 90.2°C after 11 minutes. Compared with the example, the temperature rise was fast and the time until it burned out was also short. It can be seen that the fire resistance ability is low.

[0159] Since the coating layer is a structure that is directly provided on the wooden base material even when it is formed, there is no impregnation of the coating material that becomes the coating layer, and it is considered that the fire resistance ability of the coating layer is insufficient due to the small thickness and volume of the coating layer.

[0160] (Comparative Example B) In Comparative Example B as well, a high temperature rise occurred after the start of heating, and it rose to 90.0 °C after 12 minutes. The rate of rise was similar to that of Comparative Example A, and the time until it burned out was also close. Compared with the examples, the temperature rise was faster and the time until it burned out was shorter. It can be seen that the fire resistance ability is low.

[0161] Since the aluminum thin plate is provided with a coating layer, a certain fire resistance ability by the coating layer can be realized. However, since the coating layer is formed on the aluminum thin plate, it is considered that the fire resistance ability of the coating layer is insufficient due to the small thickness and volume of the coating layer.

[0162] (Comparative Example C) Comparative Example C has a slower temperature rise compared to Comparative Examples A and B. Therefore, it can be said that the fire resistance ability is higher than these. However, as time passes, the temperature rise becomes larger, and after 45 minutes, it rose to 90.1 °C. This time is shorter compared to the examples. Also, the temperature rise after reaching a certain temperature is larger than that of the examples.

[0163] From these, it was confirmed that the fire resistance ability is lower compared to the examples.

[0164] When a coating layer is formed on the gypsum board, it is considered that the fire resistance ability of the coating layer is insufficient due to the small thickness and volume of the coating layer.

[0165] (Comparative Example D = Comparative Example 1) Comparative Example D had the same temperature rise as Comparative Example 3. It rose to 90.8 °C after 45 minutes. This temperature rise is higher than that of the examples, and the time until it burned out is also shorter.

[0166] The wooden base material is provided with only wood wool cement and has no coating layer. Similar to the result of Experiment 1, the fire resistance ability is insufficient. As a result, the temperature rises in a shorter time compared to the examples and burns out.

[0167] (Example) In the example, the temperature rise is gentler than in the comparative example, and the time until reaching 90 °C is the longest. In Table 1, it reached 90.4 °C after 69 minutes. This is a very long time compared to the comparative example and others, and it was confirmed to have high fire resistance ability.

[0168] In this way, not only is there a coating layer, but also the coating layer provided on the wood wool cement increases the thickness and volume of the coating layer, enabling the fire resistance ability to be highly exerted. As a result, the fire resistance ability can be exerted for a longer time than in the comparative example, and it is useful as a fire-resistant wooden building member. Also, it can be seen from the graph in Fig. 13 that the temperature rise of the example is gentler than that of the comparative example, and the time required for the temperature rise is also very long.

[0169] As described above, from Experiment 1, the effect of the fire resistance ability by the coating layer was confirmed, and from Experiment 2, it was confirmed that by providing a coating layer on the wood wool cement, the effect of the fire resistance ability due to the increase in the thickness and volume of the coating layer was confirmed.

[0170] (Embodiment 4)

[0171] In Embodiment 4, a further mechanism for causing fire resistance will be described. As described in Embodiments 1 to 3, the fire-resistant wooden building member of the present invention realizes the fire resistance ability by the following mechanism.

[0172] (1) The hollow ceramics contained in the coating layer convert the applied heat into far-infrared rays and radiate them. (2) By the coating layer penetrating into the wood wool cement board, the thickness and volume of the coating layer between the wooden base material and the outside increase, and the ability and time to exert the function of (1) are enhanced.

[0173] Here, the coating layer enhances the fire resistance ability and fire resistance time through the following mechanism. When heat is applied to the fire-resistant wooden building member, the temperature of the coating layer also gradually rises. In this process of temperature rise, the far-infrared conversion radiation described in (1) above is exerted.

[0174] When this temperature rise reaches around 700°C to 800°C, the spherical shape of the hollow ceramics contained in the coating layer is destroyed and becomes a planar shape (not all of the hollow ceramics are destroyed, but only those that have been in a state of being destroyed by heat). Of course, there are also hollow ceramics that remain intact.

[0175] When the hollow ceramics are in a destroyed state and become planar in this way, they form a film on the surfaces of the wood wool cement board and the wooden base material. That is, a protective wall is formed. When heat from a flame is applied from the outside, the parts of the wood wool cement board and the coating layer applied are suppressed from burning down by suppressing the temperature rise as described in (1) and (2) above. However, if there are cracks or gaps in the wood wool cement or the coating layer, heat will penetrate from here and burn the wooden base material.

[0176] In contrast, when the temperature rise reaches around 700°C to 800°C as described above, a part of the hollow ceramics is destroyed and changes from a spherical shape to a planar shape. The hollow ceramics in this planar shape form a covering layer as shown in the photograph of Fig. 14. That is, it becomes like a protective film. As a result, cracks and gaps that may occur during the process of temperature rise can be blocked (as a protective film), and the intrusion of heat and flames can be prevented.

[0177] Fig. 14 is an enlarged photograph of the coating layer after heating. It is shown that compared with before heating, after heating, the hollow ceramics are destroyed and have become a ceramic film.

[0178] Such a ceramic film serves as a protective film, preventing heat and flames from penetrating into the wooden base material. As a result, in addition to the mechanisms (1) and (2) described above, the fire resistance can be enhanced. Also, even when the hollow ceramics form a planar shape and serve as a protective film, there are hollow ceramics that remain undamaged, and the far-infrared conversion and radiation function of (1) is maintained by these.

[0179] Due to these combined mechanisms, high fire resistance is achieved. In particular, since it penetrates into the wood-wool cement board, the amount of hollow ceramics is large, and the physical quantities that exhibit the respective functions of the far-infrared conversion of (1) and the protective film in FIG. 14 are large. Coupled with this, high fire resistance can be achieved.

[0180] The fire-resistant wooden building members described in the above Embodiments 1 to 4 are examples for explaining the gist of the present invention, and include modifications and improvements within the scope not departing from the gist of the present invention.

Explanation of Signs

[0181] 1 Fire-resistant wooden building member 2 Wooden base material 3 Wood-wool cement board 4 Coating layer 41 Infiltration layer 42 Surface layer

Claims

1. A wooden base material, A wood wool cement board provided on at least a part of the front, back, and side surfaces of the wooden base material, A coating layer formed on at least a part of the front and back surfaces of the wood wool cement board, comprising: The coating layer, A plurality of hollow ceramics, A resin binder connecting the plurality of hollow ceramics to each other, And having, The coating layer converts heat applied to at least one of the wooden base material and the coating layer into far-infrared rays and radiates them, A part of the components of the coating layer penetrates into the wood wool cement board, a fire-resistant wooden building member.

2. The coating layer, An impregnated layer impregnating into the wood wool cement board, And a surface layer on the surface of the wood wool cement board, the fire-resistant wooden building member according to Claim 1.

3. The impregnated layer is formed by impregnation when the material of the coating layer is applied to the wood wool cement board, the fire-resistant wooden building member according to Claim 2.

4. The coating layer is provided on the front and back surfaces of the wood wool cement board, the fire-resistant wooden building member according to Claim 1.

5. The plurality of hollow ceramics include hollow ceramics of a plurality of different particle sizes, The particle size of the plurality of hollow ceramics is 10 μm to 150 μm, The average particle size of the plurality of hollow semilax is 40 μm, the fire-resistant wooden building member according to Claim 1.

6. The hollow ceramics contain metal oxides, The metal oxide is aluminum oxide (Al ２ O ３ ), magnesium oxide (MgO), ferric oxide (Fe2O3), sodium oxide (Na ２ O), potassium oxide (K ２ O), titanium oxide (TiO ２ ), cerium oxide (CeO ２ ), silicon dioxide (SiO ２ ), antimony trioxide (Sb ２ O ３ ), and the fire-resistant wooden building member according to claim 1 contains at least one of them.

7. The hollow ceramics have an outer surface and an internal space, At least one of the conversion of heat applied to at least one of the wooden base material and the coating layer into far-infrared rays by the conversion of far-infrared rays on the outer surface and the conversion of far-infrared rays by diffuse reflection in the internal space, the fire-resistant wooden building member according to Claim 1.

8. The resin binder includes an acrylic silicone resin and an acrylic resin, The acrylic resin has a higher content in the coating layer than the acrylic silicone resin, the fire-resistant wooden building member according to Claim 1.

9. The thickness of the wood wool cement board is smaller than the thickness of the wooden base material, the fire-resistant wooden building member according to Claim 1.

10. A decorative board is further provided outside the wood wool cement board, the fire-resistant wooden building member according to Claim 1.

11. At least a part of the hollow ceramics is broken into a flat plate shape to form a protective film when the temperature reaches a predetermined temperature or higher, the fire-resistant wooden building member according to Claim 1.

12. A building constructed using the fire-resistant wooden building member according to any one of claims 1 to 11.

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