JP2016043685A - Fireproof woody material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve reliable expression of flame resistance of a woody material.SOLUTION: On a surface of wooden base material 1, into which a phosphorous or poly-boric acid-based flame retardant agent is impregnated, a sealer layer 3 having waterproofness and moisture proofness, and a clay film 5 which has a high transparency are formed by a coating material including a bentonite of a high purity having a montmorillonite percentage content of 85 wt.% or more and an emulsion resin. Elution of an aqueous flame retardant agent impregnated into the wooden base material 1 is suppressed by the sealer layer 3 having waterproofness and moisture proofness. Further, even in the state such that failure of impregnation of the flame retardant agent into the wooden base material 1 occurs and reliable flame retardant performance cannot be obtained by only the flame retardant agent, the same is compensated by a flame retardancy of the clay film 5 on the surface thereof, whereby flame retardant performance of fireproof woody material A can be reliably and stably obtained.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire-resistant wood material having the property of being difficult to burn, and more particularly to a wood base material impregnated with a flame retardant agent and having a clay film on the surface.

  Conventionally, as this kind of fire-proofing wood material, a material in which a wood base material is made difficult to burn by the performance of the flame retardant agent by impregnating the wood base material with a flame retardant agent is well known.

  When impregnating such a wooden base material with a flame retardant agent, the wooden base material is brought into a vacuum batch type chamber and depressurized, then the chemical agent is sealed to atmospheric pressure (or pressurized state), and the chemical agent is A reduced pressure method (or reduced pressure method) for impregnating the substrate is used.

  However, it is difficult to uniformly impregnate a wooden base material with an appropriate amount of a flame retardant, and it is difficult to confirm whether the flame retardant is impregnated in an amount necessary for flame retardancy. If there is an impregnation defect such as an insufficient amount or non-uniform impregnation, the original flame retardancy cannot be exhibited. That is, at present, there are variations and instabilities in the flame retardant performance expressed only by impregnation with the flame retardant agent, and stable flame retardant performance cannot be reliably obtained, which is a problem.

  In addition, when a water-based paint is applied directly to the surface of a wooden base material that has been impregnated with water-based flame retardant and dried, the above-mentioned flame retardant agent is eluted from the surface of the wooden base material, or a component that reacts with the eluted component In the case where there is an applied product containing water, the water-based paint may not be stably applied due to gelation or the like. Furthermore, along with long-term humidity fluctuations and the like, impregnated water-based flame retardants are ejected onto the surface of the fire-resistant wooden material, causing discoloration and white flower phenomenon, which is a problem.

On the other hand, for example, as shown in Patent Document 1, in order to increase the flame retardancy of wood, the flame retardant is impregnated into the wood at 150 kg / m ³ or more in terms of solid content, and the surface of the dried wood is alkoxy metal. A method of applying a salt paint has been proposed.

JP 2006-231652 A

However, as shown in Patent Document 1, it is difficult to uniformly impregnate a flame retardant with 150 kg / m ³ or more in terms of solid content, depending on the solid wood or tree species, and impregnation with the flame retardant is not possible. It becomes a factor of quality instability due to being uniform. In addition, some of the alkoxy metal salt paints are alcohol-based, and water is also contained in some parts, and the flame retardant impregnated in the wood is eluted at the time of coating, resulting in poor coating suitability. Furthermore, since the moisture permeability of the coating film is high, when the flame retardant impregnated with the fluctuation of humidity is eluted from the wood, the surface design of the woody material is changed to a wet color or whitened. In a high humidity environment, it is difficult to stably maintain the design for a long period of time.

  The present invention has been made in view of the above points, and the object thereof is to improve the properties of both a wooden base material that becomes a fire-proofing wooden material and a coating film formed on the surface thereof, thereby providing a flame retardant agent. In order to solve the quality instability factor due to the non-uniformity of the impregnation of the wood material impregnated with, even impregnation with less flame retardant than the amount of impregnation required to achieve the desired fire prevention performance This is to ensure that flame retardancy can be expressed. In addition, another object of the present invention is to suppress the elution of the flame retardant chemical during the application of the fire retardant auxiliary coating, so that the surface of the fire assisted auxiliary coating containing a component that reacts with the flame retardant chemical component to become a gel. In addition to being able to be applied, it is intended to suppress discoloration due to elution of a flame retardant agent in a high humidity environment for a long period of time and to suppress changes in appearance such as white flower phenomenon and to maintain an excellent woody design . It is a further object of the present invention to provide a cheaper fire-resistant wood material by reducing the amount of expensive flame retardant used.

  In order to achieve the above object, according to the present invention, a water-based flame retardant is impregnated in a wooden base material, and further, the surface has waterproof and moisture-proof properties for preventing the flame retardant from eluting. A non-aqueous sealer layer was provided, and an aqueous clay film was formed thereon.

  Specifically, the first invention relates to a fire-resistant wood material, and this fire-proof wood material is used for preventing elution of the flame retardant agent on the surface of a wooden substrate impregnated with an aqueous flame retardant agent. A non-aqueous sealer layer having a waterproof property and a moisture-proof property is provided, and a clay film made of an aqueous clay paint is formed on the surface of the sealer layer.

  Here, when a water-based clay paint is applied directly to the surface of a wooden substrate that has been impregnated with a water-based flame retardant and dried, the flame retardant elutes from the surface of the wooden substrate and the clay paint is stabilized by gelation or the like. In the present invention, the water-based flame retardant is not suitable for the problem that a uniform clay film layer cannot be formed because impurities cannot be applied or impurities are mixed in the clay film layer, and the desired fireproof performance cannot be obtained. Since the non-aqueous sealer layer is provided on the surface of the wooden substrate impregnated with the chemical and dried, the impregnated flame retardant does not elute into the sealer layer. Further, since the water-based clay film paint is provided on the non-aqueous sealer layer, a special effect that the clay film layer can be reliably formed on the sealer layer can be expected.

In addition, the waterproof property of the sealer layer is such that when the water-based clay paint is applied to the surface of the sealer layer, the water-based flame retardant impregnated in the wooden base material does not elute into the water in the water-based clay paint. Sexually. In addition, when using a fire-resistant wood material, the sealer layer absorbs moisture or moisture when the surrounding humidity is high, and the flame retardant escapes from the wood substrate when the moisture or moisture is released. It shall have a moisture permeability resistance value that can prevent this. A higher moisture permeability resistance value can suppress the escape of the flame retardant agent over a long period of time. For example, the moisture permeability resistance value is desirably 5 × 10 ⁻³ (m ² · s · Pa) / ng or more. Moreover, it is preferable that a wooden base material is a rectangular board | plate material, In that case, the surface of a wooden base material shall mean the single side | surface of this board | plate material, or the whole surface of both surfaces.

  In the first invention, a non-aqueous sealer layer having a waterproof property and a moisture-proof property for preventing elution of the flame retardant agent is provided on the surface of the wooden base material impregnated with the water-based flame retardant agent. Since a clay film made of water-based clay paint is formed on the surface and a uniform non-combustible film is formed on the clay film, the flame retardant due to the flame retardant impregnated in the wood substrate and the flame retardant due to the clay film on the surface As a result, the fireproof performance of the fireproof wood material can be enhanced.

  In addition, if the impregnation failure such as insufficient amount of impregnation of the flame retardant agent or non-uniform impregnation of the wood base material has occurred, and the flame retardant agent alone does not provide a reliable flame retardant performance to the wood base material Even so, the flame retardancy of the clay film on the surface is supplemented, and the flame retardancy of the fire-resistant wood material can be obtained reliably and stably.

  Furthermore, the amount of flame retardant impregnation into the wooden base material required to realize fire prevention performance can be reduced by the amount that fire protection performance can be obtained by clay film, and the amount of expensive flame retardant use can be reduced. The manufacturing cost can be reduced by reducing the number.

  In addition, the sealer layer is made of a non-aqueous paint having moisture resistance to prevent elution of the flame retardant agent, and therefore absorbs moisture or moisture when the surrounding humidity is high when using a fireproof wood material, The sealer layer prevents the flame retardant from escaping from the wood substrate when releasing its moisture or moisture. Therefore, even when the fireproof wood material is used for a long period of time, discoloration and white flower due to chemical leaching can be suppressed, and the design of the fireproof wood material can be stably maintained for a long time.

  According to a second invention, in the first invention, the clay film formed on the surface of the sealer layer is made of an aqueous paint containing a high-purity bentonite having a purity of a predetermined value or more and an aqueous resin, and has transparency. It is characterized by. Here, the high-purity bentonite means that the content of montmorillonite, which is the main component, is, for example, 85% by weight or more.

  In this second invention, a clay film is formed from an aqueous paint containing high-purity bentonite and an aqueous resin, and a uniform incombustible film is formed on the clay film. The flame retardancy due to fire and the flame retardancy due to the clay film on the surface come to exhibit synergistic effects, and this synergistic effect can further enhance the fire performance of the fire-resistant wood material.

  In addition, since the bentonite in the clay film has a high purity, its flame retardancy is high, and the thickness of the clay film can be reduced correspondingly, and the transparency becomes high. Therefore, the woody design feeling of the woody base material as a base can be exposed to the surface as it is, and in addition to the improvement of fire prevention performance, it is possible to suppress the deterioration of the appearance of the woody material.

  According to a third invention, in the first or second invention, the sealer layer is made of a paint containing a filler.

  In the third aspect of the invention, since the filler used as the sealer layer contains a filler, the filler provides a sealing effect for the sealer layer, improves the smoothness, and the clay film formed thereon is uniform. It becomes scaly. In addition, the filler can keep the thickness of the sealer layer large.

  A fourth invention is characterized in that, in the first to third inventions, the sealer layer is made of a UV curable paint.

  In the fourth aspect of the invention, the sealer layer is made of a UV curable paint, so that rapid curing by UV drying can be realized as a drying process, and the productivity of the fireproof wood material is improved.

  According to a fifth invention, in the second to fourth inventions, the high-purity bentonite has a purity of 85% by weight or more (montmorillonite content is 85% by weight or more).

  In this fifth invention, since the montmorillonite content of bentonite is 85% by weight or more, bentonite is surely highly purified, a uniform non-combustible film is reliably generated on the clay film, and the flame retardancy is further stabilized. Can be improved.

According to a sixth invention, in any one of the second to fifth inventions, the flame retardant is a phosphorus flame retardant or a polyboric acid flame retardant, and the clay film has an amount of montmorillonite of 12 g / m ² or more. It is characterized by being formed with high-purity bentonite.

In this sixth invention, the flame retardant is a phosphorus-based or polyboric acid-based flame retardant, and the clay film is formed of high-purity bentonite so that the amount of montmorillonite is 12 g / m ² or more. In the exothermic test with a calorimeter, a stable fireproof performance with a total calorific value of 8.0 MJ / m ² or less in a predetermined time can be obtained.

  A seventh invention is characterized in that, in any one of the first to sixth inventions, the surface of the wooden base material is smoothed by a smoothing process such as a sealer coating or a polishing process.

  In this seventh invention, the surface of the wood substrate is a smooth surface, and the sealer layer and the clay film are formed on the smooth surface. Therefore, the clay film is a smooth clay layer made of uniform scaly clay. The fireproof performance by the clay film can be stably obtained.

  According to an eighth invention, in any one of the first to seventh inventions, the wood base material is formed by laminating a plurality of constituent members made of a wood single board, chip board or wood fiber board in the base material thickness direction. It is characterized in that only the constituent material of the outermost layer is impregnated with a flame retardant agent.

  In the eighth aspect of the invention, since only the constituent material of the outermost layer of the wooden base material is impregnated with the flame retardant and the clay film is formed on the surface thereof, the fireproof performance of only the constituent member of the outermost layer of the wooden base material. Can be selectively enhanced. In addition, it is possible to impregnate a flame retardant agent and form a clay film only on the constituent material that is the outermost layer in advance, and then to laminate and integrate the constituent material with other constituent materials. Can be easily manufactured, and improvement in the degree of freedom in product design can be expected.

  According to a ninth invention, in any one of the first to eighth inventions, the wooden base material is impregnated with an amount of a flame retardant agent that does not satisfy the standard of the flame retardant material specified in the Building Standard Law. The fire-resistant wood material is characterized in that it is configured to satisfy the standards of flame retardant materials stipulated in the Building Standards Law due to the fire-proof performance of the clay film formed on the surface of the wood substrate. To do.

  According to the ninth aspect of the present invention, a clay film is formed on the surface of a wooden base material impregnated with an amount of a flame retardant agent that does not satisfy the standards for flame retardant materials stipulated in the Building Standard Law. The fire-resistant wood material satisfies the standards for flame-retardant materials stipulated in the Building Standards Law due to the fire-proof performance of the clay film. Therefore, it is possible to obtain a fireproof woody material having a more natural wood texture and having the performance of a flame retardant material while reducing the amount of expensive flame retardant used.

  According to a tenth aspect of the invention, in any one of the first to eighth aspects of the invention, the wooden base material is impregnated with an amount of a flame retardant agent that does not satisfy the standard of the semi-incombustible material specified in the Building Standard Law. The fire-resistant wood material is configured to satisfy the standards of quasi-incombustible materials stipulated in the Building Standards Law due to the fire-proof performance of the clay film formed on the surface of the wood substrate. To do.

  In the tenth aspect of the invention, a clay film is formed on the surface of a wooden substrate impregnated with an amount of a flame retardant that does not satisfy the standards for quasi-incombustible materials specified in the Building Standards Act. Fire-resistant wood materials satisfy the standards for quasi-incombustible materials stipulated in the Building Standards Law due to the fire-proof performance of the clay film. Therefore, it is possible to obtain a fire-resistant wood material having a more natural wood texture and a semi-incombustible material performance while reducing the amount of expensive flame retardant used.

  In an eleventh aspect of the invention, in any one of the first to eighth aspects of the invention, the wooden base material is impregnated with an amount of a flame retardant agent that does not satisfy the standard of the non-combustible material specified in the Building Standard Law. In addition, the fire-resistant wood material is characterized in that it is configured so as to satisfy the standards of non-combustible materials defined in the Building Standards Law due to the fire-proof performance of the clay film formed on the surface of the wood substrate.

  In the eleventh aspect of the invention, a clay film is formed on the surface of a wooden base material impregnated with an amount of a flame retardant agent that does not satisfy the standards for non-combustible materials specified in the Building Standards Law. Fire-resistant wood materials satisfy the standards for non-combustible materials stipulated in the Building Standards Law due to the fire-proof performance of the clay film. Therefore, it is possible to obtain a fire-resistant wood material having a more natural wood texture and the performance of a non-combustible material while reducing the amount of expensive flame retardant used.

  As described above, according to the first invention, a non-aqueous sealer having waterproof and moisture-proof properties for preventing elution of the flame retardant on the surface of the wooden base material impregnated with the water-based flame retardant. By providing a layer and forming a clay film made of water-based clay paint on this surface, the fire resistance of the fire-resistant wood material by the synergistic effect of the flame resistance of the impregnated flame retardant and the flame resistance of the clay film on the surface Performance can be increased. In addition, even in the state where reliable fire prevention performance is not obtained due to poor impregnation of flame retardant chemicals, the flame resistance of the clay film on the surface is compensated, and the fire resistance performance of the fire resistant wood material is reliably and stably obtained. be able to. Furthermore, since a non-aqueous sealer layer having a waterproof property and a moisture-proof property for preventing elution of the flame retardant agent is provided on the surface of the wooden substrate impregnated with the water-based flame retardant agent, the flame retardant agent Even when a water-based clay paint is applied to the surface of a wooden substrate impregnated with a flame retardant, the flame retardant can be stably provided on the surface of the sealer layer without being mixed with the sealer layer or the clay paint. In addition, it is possible to suppress discoloration and white blossom due to long-term drug leaching and to maintain a stable design. Furthermore, the clay film can reduce the production cost of the fire-resistant wood material by reducing the amount of expensive flame retardant used due to the fire-proof performance.

  According to the second invention, the clay film is made of a water-based paint including a high-purity bentonite having a purity of a predetermined value or more and a water-based resin, and thus has a transparency. The thickness of the clay film can be reduced, and in addition to the improvement in fire prevention performance, the transparency can be improved and the reduction in the appearance of the wood material can be suppressed.

  According to the third invention, since the sealer layer is made of a paint containing a filler, the filler has a sealing effect of the sealer layer, and the clay film becomes a uniform scaly shape due to smoothness. At the same time, the thickness of the sealer layer can be maintained by the filler.

  According to the fourth invention, since the sealer layer is made of a UV curable paint, rapid curing by a UV dryer is realized as a drying process, and the productivity of fireproof wood material can be improved.

  According to the fifth invention, by setting the montmorillonite content of bentonite to 85% by weight or more, a uniform non-combustible film can be reliably generated on the clay film, and the flame retardancy can be improved more stably. .

According to the sixth invention, the flame retardant is a phosphorus flame retardant or a polyboric acid flame retardant, and the clay film is formed of high-purity bentonite so that the amount of montmorillonite is 12 g / m ² or more. In a heat generation test using a meter, it is possible to obtain a stable fire prevention performance with a total heat generation amount of 8.0 MJ / m ² or less in a predetermined time.

  According to the seventh invention, by making the surface of the wooden substrate a smooth surface, the clay film formed on the smooth surface can be a smooth clay layer made of uniform scaly clay, The fireproof performance by the film can be obtained stably.

  According to the eighth aspect of the present invention, the wooden base material is formed by laminating a plurality of constituent materials in the thickness direction of the base material, and only the constituent material of the outermost layer is impregnated with the flame retardant, The fire performance of only the outermost layer constituent material can be selectively enhanced. In addition, pre-impregnation of the flame retardant agent only to the constituent material that becomes the outermost layer and the formation of a clay film, and by laminating and integrating with other constituent materials, it becomes easy to manufacture fire-resistant wood materials, The improvement of the freedom of product design can be expected.

  In the ninth invention, the wooden base material is impregnated with an amount of a flame retardant agent that does not satisfy the standard of the flame retardant material specified in the Building Standards Law, and is specified in the Building Standards Law by the fireproof performance of the clay film. To meet the standards of fire retardant materials made. In the tenth invention, the wooden base material is impregnated with an amount of a flame retardant that does not satisfy the standard of the semi-incombustible material specified in the Building Standard Law. The standards for quasi-incombustible materials specified in the above are satisfied. Furthermore, in the eleventh invention, the wooden base material is impregnated with an amount of a flame retardant agent that does not satisfy the standards for non-combustible materials specified in the Building Standards Law. The standard of incombustible material specified was satisfied. According to these inventions, even on a wooden base material impregnated with an amount of flame retardant that does not satisfy the standards of flame retardant materials, semi-incombustible materials and non-flammable materials stipulated in the Building Standard Law, By forming a film, the fireproof performance will satisfy each standard of flame retardant material, quasi-incombustible material and non-flammable material specified in the Building Standard Law, respectively, and the amount of expensive flame retardant used In addition, it is possible to obtain a fireproof wood material having a more natural wood texture and having performances of a flame retardant material, a semi-incombustible material and a non-combustible material.

FIG. 1 is a schematic cross-sectional view of a fireproof wood material according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a modified example of the fireproof wooden material. Drawing 3 is a figure showing an example of a manufacturing process of fireproof woody material. FIG. 4 is a diagram showing the relationship between the type and impregnation amount of the flame retardant agent, the solid content of the clay film, and the total calorific value of the corn calorie exothermic test in the examples. FIG. 5 is a diagram showing the relationship between the purity of high-purity bentonite or bentonite in the flame retardant agent of the example and the total calorific value of the corn calorie heat generation test.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use at all.

  FIG. 1 shows a fireproof wood material A according to an embodiment of the present invention, and this fireproof wood material A is used as a construction material such as a wall material of a building to form a fireproof material. The fire-resistant wood material A includes, for example, a rectangular plate-like wood base material 1 impregnated with a water-based flame retardant, and the surface of the wood base material 1 is smoothed by a sealer layer 3 formed of an undercoat paint. The clay film 5 is formed on the sealer layer 3 by overcoating with a clay paint, and the clay film 5 has a noncombustible paint composition.

  In this embodiment, the fire-resistant wood material A is not a fire-resistant material according to the standard that satisfies the standard, but includes a flame-retardant material, a semi-incombustible material, and a non-combustible material according to the standard, and has “fire-proof”. Used to mean.

[Woody substrate]
The wood base material 1 may be any material as long as it is a wood material. For example, a fiber board such as IB, MDF, hard board, particle board and the like can be appropriately selected. Moreover, as shown in FIG. 2, the wooden substrate 1 is composed of a plywood, LVL, in which a plurality of constituent materials 1a, 1a,... It may be CLT (orthogonal laminated plate) or the like. Moreover, a solid board | plate material and a laminated board material can also be used.

(Impregnation with flame retardants)
The woody base material 1 is impregnated with a water-based flame retardant from the surface (the impregnated portion is indicated by adding dots) in FIGS. As the flame retardant, for example, a phosphorus-based or polyboric acid-based flame retardant is preferably used.

  Any method may be used when the wood base material 1 is impregnated with the flame retardant, but it is preferable to employ, for example, a decompression method, a coating method, or a dipping method.

  In the depressurization method, for example, after putting the wooden substrate 1 into a vacuum batch type chamber and depressurizing, the flame retardant agent is sealed in the chamber and kept at atmospheric pressure, and then the wooden substrate 1 is impregnated with the agent. What is necessary is just to dry. When the flame retardant is phosphorus-based, for example, it is preferable to reduce the pressure for about 1 hour, then return to atmospheric pressure and hold for 1 day to impregnate. The polyboric acid-based flame retardant is low in solubility. It is preferable to dissolve in hot water, depressurize at a temperature of 30 to 60 ° C. for about 1 hour, return to atmospheric pressure, hold at a temperature of 60 ° C. for 1 day and impregnate.

  When the wooden substrate 1 is a laminate of a plurality of constituent materials as shown in FIG. 2, only the outermost constituent material 1a may be impregnated with the flame retardant.

  The amount of impregnation of the flame retardant is preferably an amount that satisfies the standards of flame retardant materials, quasi-incombustible materials and non-flammable materials stipulated in the Building Standards Act. And the quantity which does not satisfy | fill each standard of a nonflammable material may be sufficient.

  Specifically, the flame retardant materials specified in the Building Standards Act have the impregnation standards specified in Article 1-6 of the Building Standards Act Enforcement Ordinance. What is necessary is just to impregnate a chemical | medical agent or to impregnate the flame-retardant chemical | medical agent of the quantity which is less than the recommended value and does not reach a recommended value. In the latter case, it will not be a flame retardant material as stipulated in the Building Standards Act as it is, but by forming a clay film 5 on its surface, a flame retardant material stipulated in the Building Standards Act (Article 1-6 of the Building Standards Act Enforcement Ordinance) ) Criteria can be satisfied.

  In addition, the semi-incombustible material stipulated in the Building Standards Act is impregnated with the amount of impregnation specified in Article 1-5 of the Building Standards Act Enforcement Ordinance. Alternatively, it may be impregnated with an amount of flame retardant that is less than the recommended value and does not reach the recommended value. In the latter case, it is not a quasi-incombustible material as stipulated in the Building Standards Act as it is, but by forming a clay film 5 on its surface, a quasi-incombustible material (Article 1-5 of the Building Standards Act Enforcement Ordinance) ) Criteria can be satisfied.

  Furthermore, the standards for impregnation of non-combustible materials specified in the Building Standards Act are stipulated in Article 2-9 of the Building Standards Act or Article 108-2 of the Building Standards Act Enforcement Ordinance. An amount of the flame retardant agent may be impregnated, or an amount of the flame retardant agent which is less than the recommended value and does not reach the recommended value may be impregnated. In the latter case, it will not be a non-combustible material as stipulated in the Building Standards Act as it is, but by forming a clay film 5 on its surface, a non-combustible material as defined in the Building Standards Act (Article 2-9 of the Building Standards Act or the Building Standards Act) It becomes possible to meet the criteria of Article 108-2) of the Enforcement Ordinance.

(Sealer processing)
The sealer layer 3 is made of a non-aqueous paint having a waterproof property and a moisture-proof property for preventing elution of the flame retardant agent from the wooden base material 1 impregnated with the water-based flame retardant agent. Specifically, the sealer layer 3 is formed by applying an aqueous flame retardant soaked in the wooden substrate 1 when or after applying the aqueous clay coating on the surface of the wooden substrate 1. It is provided for the purpose of preventing elution into the clay film 5 and mixing with the clay film 5 (incombustible paint layer) as an impurity, and is formed, for example, by applying an undercoat paint to the surface. By treating the surface of the wooden substrate 1 with the sealer layer 3, the clay film 5 thereon can be formed into a smooth clay layer made of uniform scaly clay not mixed with a flame retardant. . In addition to making the surface of the wood substrate 1 smooth, the sealer layer 3 also prevents the clay paint (noncombustible paint composition) that becomes the clay film 5 from penetrating into the wood substrate 1. Formed to achieve.

The waterproof property of the sealer layer 3 is such that the flame retardant impregnated in the wooden base material 1 does not elute into the water in the aqueous clay paint when the aqueous clay paint is applied to the surface of the sealer layer 3. And In addition, the moisture resistance of the sealer layer 3 is such that when the fireproof wood material A after the application of the water-based clay paint is used, moisture or moisture is absorbed when the surrounding humidity is high, and the moisture and moisture are released. At the same time, the moisture permeability resistance value is such that the flame retardant can be prevented from escaping from the wooden substrate 1. A higher moisture permeability resistance value can suppress the escape of the flame retardant agent over a long period of time. The moisture permeability resistance value of the sealer layer 3 is preferably 5 × 10 ⁻³ (m ² · s · Pa) / ng or more, for example, the sealer layer 3 made of an acrylic UV curable paint is 5.6 ×, for example. 10 ⁻³ (m ² · s · Pa) / ng (coating amount 60 g / m ² ).

  The sealer layer 3 can also be formed after the surface of the wooden substrate 1 is made smooth by polishing.

  Further, when a clay paint is applied to the surface of the wood base material 1 impregnated with the flame retardant, the flame retardant dissolves and the clay paint may be agglomerated. Is effective.

As the undercoat paint used as the sealer layer 3, for example, a paint such as a urethane sealer or an acrylic UV sealer (ultraviolet curable acrylic resin paint) is used. The total calorific value in the exothermic test using a cone calorimeter when combined with the clay film 5 is, for example, about 4.4 MJ / m ² for a urethane sealer, and for example, 3.2-4. 5 MJ / m ² or so. Acrylic UV sealers can achieve flame retardance equivalent to or better than urethane sealers, and both can meet the standards of non-combustible materials specified in the Building Standards Law by combination with clay film 5.

  By forming the sealer layer 3 with a UV curable paint (ultraviolet curable paint), high-speed curing by UV drying can be realized as a drying step, and the productivity of the fireproof wood material A is improved.

  The sealer layer 3 may be a paint containing a filler. If this filler contains, for example, talc, silica, mica, clay, calcium carbonate, kaolin, alumina white, white carbon, aluminum hydroxide, magnesium carbonate, barium carbonate, barium sulfate, zinc stearate, aluminum stearate, etc. The particle size is about 0.1 to 100 μm.

  Thus, when the coating material used as the sealer layer 3 contains a filler, the filler provides the sealing effect of the sealer layer 3 and improves smoothness, so that the clay film 5 has a uniform scale shape. Moreover, the thickness of the sealer layer 3 can be kept at a required thickness by the filler.

The application amount of the undercoat paint is preferably 40 to 80 g / m ^2, for example. The method for applying the undercoat paint is not particularly specified, and may be a known method such as a roll coater, a flow coater, or a spray. The drying and solidification method can be performed by a known method such as a hot air dryer or a ventilation dryer.

  The sealer layer 3 made of a transparent thin film is formed by the undercoat paint that becomes the sealer layer 3. The transparency of the sealer layer 3 may be such that the wooden surface design on the surface of the wooden substrate 1 provided with the sealer layer 3 is visible through the sealer layer 3.

[Clay film]
The clay film 5 is a transparent thin film and has an incombustible coating composition. Transparency should just be transparent or the grade which the wooden surface design of the wooden base material 1 surface in which the clay film 5 and the sealer layer 3 were provided can be visually recognized through the clay film 5. This incombustible coating composition can achieve transparency by containing fine powder of high-purity bentonite having a purity (montmorillonite content) of a predetermined value or more and an emulsion resin.

  The purity of the bentonite fine powder having a high purity is such that the montmorillonite content is 85% by weight or more, preferably 90% by weight or more, and most preferably 95% by weight or more.

  In order to specify the purity of this bentonite, for example, a colorimetric determination method of methylene blue in accordance with JBAS-107-91, that is, a sample is added to a sodium pyrophosphate solution and a methylene blue solution, and the solution is dropped on a filter paper. Use a method of observing whether there is a limit. Then, the purity is determined by dividing the amount of methylene blue adsorbed by bentonite whose purity is unknown by the amount of methylene blue adsorbed with a montmorillonite content of 100% by weight. For example, when the methylene blue adsorption amount of bentonite whose purity is unknown is 136 mmol / 100 g, the methylene blue adsorption amount of montmorillonite content 100 wt% is defined as 140 mmol / 100 g, and the purity of bentonite is (136/140) × 100 = Calculated as 97% by weight.

  When producing such high-purity bentonite fine powder, a crude bentonite obtained by pulverizing ore is added to water to swell and disperse it to obtain a crude liquid, and the crude liquid is centrifuged in multiple stages (for example, three stages). The purified liquid is obtained (impurities settle), and the purified liquid is dried and pulverized to obtain a high-purity bentonite fine powder. In this way, a fine powder of high-purity bentonite can be obtained easily and reliably.

  The particle size of the bentonite fine powder is desirably 45 μm or less when wet (100% passing when 325 mesh is wet). Moreover, the swelling power of bentonite needs to be 45 ml / 2g or more, for example.

By setting the concentration of the high purity bentonite fine powder in the incombustible coating composition, the clay film 5 is formed so that the amount of the montmorillonite is 12 g / m ² or more.

  As the emulsion resin, for example, acrylic resins (particularly styrene-containing acrylic resins), various synthetic resins such as urethane resins and silicone resins, and mixtures thereof are used. In particular, it is preferable to add a mixture of an acrylic resin and a urethane resin because nonflammability increases. A soap-free emulsion resin is desirable because it can prevent gelation (aggregation) of the paint.

  The concentration of the emulsion resin is desirably 5 to 20% by weight in terms of solid content, for example. If the amount is less than 5% by weight, the effect of inhibiting the swelling of bentonite is insufficient, and if it exceeds 20% by weight, the resin component in the clay film 5 increases and the resin (clay film 5) itself tends to burn. It is to become.

  When preparing an incombustible paint composition, for example, bentonite fine powder may be added to water, stirred with a stirrer, etc., and further mixed with urethane resin and acrylic resin while stirring, or resin added to water Bentonite may be dispersed later.

  As other additives, an auxiliary agent such as an antifoaming agent, a dispersing agent, and an antifungal agent, and a surfactant may be added, and a pigment may be added depending on the application.

  The coating method of the top coat for forming the clay film 5 is not particularly specified, and a known method such as a flow coater, a roll coater, or a spray can be adopted, and the drying and solidifying method is also a hot air dryer, a ventilation dryer, a UV dryer. It can be carried out by a known method such as an EB dryer.

[Production method of fireproof wood]
FIG. 3 illustrates the production process of the fireproof wood material A. First, the wood base material 1 is impregnated with the flame retardant agent in the flame retardant agent impregnation step. In the subsequent first drying step, for example, after drying at 60 ° C. for 3 days, the surface of the wooden substrate 1 is smoothed by sanding with, for example, 240 sandpaper in the first polishing step, A urethane sanding sealer is applied at, for example, about 60 g / m ² to form the sealer layer 3 and then dried in the second drying step, for example, at 60 ° C. for 2 hours or at room temperature for 1 day. In the next second polishing step, the surface of the wood substrate 1 is smoothed by sanding with, for example, 240 sandpaper. In the next clay paint coating process, a clay paint (incombustible paint composition) is applied at about 100 g / m ² to form a clay film 5, and then in the third drying process, for example, at 60 ° C. for 1.5 hours, or at room temperature. Let dry. The clay paint coating step and the third drying step are repeated until the solid content of the clay film 5 reaches a predetermined amount, and the process ends when the solid content of the clay film 5 reaches a predetermined amount.

  Therefore, in the above-described embodiment, the clay film 5 is formed on the surface of the wood base material 1 impregnated with the flame retardant with the paint containing the high-purity bentonite and the resin, and a uniform non-combustible film is formed on the clay film 5. Since it is produced, the flame retardancy due to the flame retardant impregnated in the wood substrate 1 and the flame retardance due to the clay film 5 on the surface work synergistically, and this synergistic effect results in fire prevention of the fire-resistant wood material A Performance can be increased.

  In particular, when the content of montmorillonite in bentonite is 85% by weight or more (preferably 95% by weight or more), bentonite is surely highly pure, and a uniform non-combustible film is reliably generated on the clay film 5 and is flame retardant. Can be improved more stably.

  Further, since the surface of the wooden substrate 1 is made a smooth surface by a sealer layer 3 by a sealer coating or a polishing process, and the clay film 5 is formed on the smooth surface, the clay film 5 is formed into a uniform and scaly layer. Thus, the fireproof performance of the clay film 5 can be obtained stably.

  Further, by forming the sealer layer 3 on the surface of the wooden substrate 1, the sealer layer 3 can prevent the clay paint (non-combustible coating composition) from penetrating into the wooden substrate 1, and thus the sealer layer 3 Thus, both smoothing of the coated surface of the clay paint (incombustible paint composition) and prevention of soaking can be achieved.

  Therefore, even if the impregnation failure of the flame retardant with respect to the wooden base material 1 has occurred, and the reliable flame retardant performance cannot be obtained in the wooden base material 1 only with the flame retardant chemical, it is used as a clay film on the surface. Thus, the flame retardancy of No. 5 is compensated, and the flame retardance performance of the fireproof wood material A can be obtained reliably and stably.

  And since the sealer layer 3 made of a non-aqueous paint having a waterproof property for preventing the elution of the water-based flame retardant is provided on the surface of the wooden substrate 1, the clay film 5 is provided on the surface of the wooden substrate 1. Even when a water-based clay paint is applied to form water, the sealer layer 3 can suppress the water-based flame retardant impregnated in the wooden substrate 1 from being eluted into the water in the water-based clay paint. Therefore, it is possible to prevent elution of the water-based flame retardant from the wooden base material 1 at the time of painting, and to exhibit the flame retardancy due to the water-based flame retardant, and the flame retardant is mixed with the clay paint. The clay film 5 can be stably provided on the surface.

  Further, since the sealer layer 3 is made of a non-aqueous paint having a moisture resistance for preventing the elution of the flame retardant agent, the clay film 5 has a moisture content when the surrounding humidity is high when the fireproof wood material A is used. Even when the water is absorbed, the sealer layer 3 can prevent the flame retardant from escaping from the wooden substrate 1 at the same time when the moisture is released. Therefore, even when the fire-resistant wood material A is used for a long period of time, discoloration and whiteness due to chemical leaching can be suppressed, and the design properties of the fire-resistant wood material A are not reduced. Flame retardancy can be stably maintained over a long period of time.

  Moreover, since the bentonite in the clay film 5 is highly pure, its flame retardancy is high, and the thickness of the clay film 5 can be reduced accordingly. Therefore, the clay film 5 becomes transparent, so that the wooden texture of the wooden base material 1 as a base can be exposed to the surface as it is, and in addition to improving the fire prevention performance, the appearance of the wooden material is also improved. Can be planned.

  Furthermore, the amount of impregnation of the flame retardant agent into the wooden substrate 1 can be reduced by the amount that the fire protection performance is obtained by the clay film 5, and the amount of expensive flame retardant agent used can be reduced to reduce the manufacturing cost. .

In addition, the flame retardant is a phosphorus-based or polyboric acid-based flame retardant, and the clay film 5 is formed so that the amount of montmorillonite is 12 g / m ² or more. Stable fireproof performance with a calorific value of 8.0 MJ / m ² or less can be obtained.

  As shown in FIG. 2, the wooden substrate 1 is formed by laminating a plurality of constituent materials 1a, 1a,... Made of a wood single board, chipboard or wood fiber board, and only the outermost constituent material 1a of them is laminated. If the flame retardant is impregnated, the clay film 5 is formed on the surface of the outermost layer constituent material 1a, so that only the outermost layer constituent material 1a of the wood substrate 1 can be selectively protected against fire. Can be increased. In addition, it is possible to preliminarily impregnate the flame retardant agent and form the clay film 5 only on the constituent material 1a which is the outermost layer, and then stack and integrate the constituent material 1a with other constituent materials 1a. Manufacture of the fireproof wooden material A becomes easy.

  Even if the wooden base material 1 is impregnated with an amount of a flame retardant that does not satisfy the standard of the flame retardant material stipulated in the Building Standards Act, the clay film 5 is formed on the surface of the wooden base material 1. By forming, the fireproof wood material A satisfies the standard of the flame retardant material stipulated in the Building Standard Law due to the fireproof performance of the clay film 5. In addition, an improvement in the degree of freedom in product design can be expected.

  Moreover, even if it is the wooden base material 1 impregnated with the flame retardant of the quantity which does not satisfy the standard of the quasi-incombustible material prescribed | regulated by the Building Standard Law, fire resistance is formed by the clay film 5 being formed on the surface. The wood material A satisfies the standard of the quasi-incombustible material stipulated in the Building Standard Law due to the fireproof performance of the clay film 5.

  Furthermore, even if the wooden base material 1 is impregnated with an amount of a flame retardant agent that does not satisfy the standard of non-combustible material stipulated in the Building Standard Law, the clay film 5 is formed on the surface thereof, The fire-resistant wood material A satisfies the standard of the non-combustible material specified in the Building Standard Law due to the fire-proof performance of the clay film 5.

  In other words, if the amount of flame retardant used (impregnation amount) is increased to satisfy the standards for flame retardant materials, quasi-incombustible materials and non-flammable materials stipulated in the Building Standard Law, the use of the flame retardant agent is used. As the amount increases, the wood texture inherent to the wood material deteriorates and the surface appearance deteriorates. However, the clay film 5 is formed on the surface, and the fire prevention performance of the whole wood material is improved by the fire prevention performance. By increasing the amount, the amount of the flame retardant used can be reduced, and the fireproof wood material A having a more natural wood texture and the performance of the flame retardant material can be obtained at low cost.

[Other Embodiments]
In the said embodiment, although the fireproof wooden material A in which the clay film | membrane 5 is formed in the surface (one side) of the wooden base material 1 is demonstrated, the similar clay film is formed in the back surface (single side) of the wooden base material 1. FIG. 5 may be formed. Further, a similar clay film 5 may be formed on the back surface in addition to the front surface of the wood base material 1 to constitute the fireproof wood material A, and the fire resistance of the fireproof wood material A can be further improved. it can.

  Next, specific examples will be described.

[Test 1]
The total calorific value of the corn calorie exothermic test was tested by changing the kind and impregnation amount of the flame retardant in the fire-resistant wood material and the solid content of the clay film.

(Example 1)
Phosphorus / nitrogen-based flame retardant diluted to a solid content of 15% on a cedar veneer with a thickness of t = 15 mm as a wooden substrate (trade name “Nonen W-200” manufactured by Maruhishi Oil Chemical Co., Ltd.) ) Was impregnated by the reduced pressure method. In this depressurization method, the pressure was reduced in a vacuum batch type chamber for 1 hour, then returned to atmospheric pressure and maintained for 1 day for impregnation. Then, it was made to dry for 72 hours (3 days) with a 60 degreeC ventilation dryer, and the flame retardant chemical | medical agent impregnation wood base material which the flame retardant chemical | medical agent contained by 118 kg / m < ³ > was obtained.

  The clay paint for forming the clay film is composed of 75.7 parts by weight of water, 10 parts by weight of urethane resin emulsion, 10 parts by weight of acrylic resin emulsion, 4 parts by weight of high-purity bentonite, 0.2 part by weight of antifoaming agent. Then, 0.1 parts by weight of a dispersing agent and 0.04 parts by weight of a fungicide were added and diffused until uniform. As the high-purity bentonite, the trade name “Kunipia F” manufactured by Kunimine Industry Co., Ltd. was used. This “Kunipia F” has a montmorillonite content of 98.5% by weight.

Clay coating on the surface of the flame燃薬impregnated wood substrate, the solid content of the clay amount (amount of montmorillonite) was coated by adjusting the coating amount such that 4g / m ² to 102 g / m ^2. The ratio of the amount of montmorillo in the clay paint was calculated as 3.94% in the paint. After this application, it was dried at 60 ° C. for 90 minutes, and this was cut into 99 mm × 99 mm to obtain a sample.

(Example 2)
The impregnation amount of the flame燃薬agent to wood substrate as 120 kg / ^{m 3} in solid content, the coating amount of the clay coating and 296 g / ^{m 2,} the solid content was 12 g / ^{m 2.} Other than that is the same as Example 1 above.

(Example 3)
The amount of impregnation of the flame retardant with respect to the wood base was 125 kg / m ³ in terms of solid content, the amount of clay paint applied was 495 g / m ² , and the solid content was 20 g / m ² . Other than that is the same as Example 1 above.

(Example 4)
The amount of impregnation of the flame retardant with respect to the wooden substrate was 121 kg / m ³ in terms of solid content. A clay paint was not applied to the surface of the flame retardant-impregnated wood base material, and the flame-retardant agent-impregnated wood base material itself was cut into 99 mm × 99 mm to prepare a sample.

(Example 5)
The amount of impregnation of the flame retardant agent with respect to the wood substrate was 171 kg / m ³ in terms of solid content. The rest is the same as Example 4 above.

(Example 6)
A cedar veneer with a thickness of 15 mm as a wooden base material is impregnated with a sodium polyborate flame retardant diluted to a solid content of 27% (trade name “Fireless B Powder” manufactured by Trust Life Co., Ltd.) by the decompression method. I let you. In this depressurization method, the pressure was reduced for 1 hour under a heating condition of 60 ° C. in a vacuum batch type chamber, then returned to atmospheric pressure and maintained for 1 day for impregnation. Then, it was dried for 72 hours with a 60 ° C. ventilation dryer to obtain a flame-retardant agent-impregnated wood base material containing 181 kg / m ³ of a flame-retardant agent in solid content.

The surface of the flame retardant-impregnated wood base material was smoothed (sanded) with sandpaper No. 240, and then a urethane sealer was applied at 60 g / m ² and dried. Solid content similar to clay coating as in Example 1 on the surface was coated by adjusting the coating amount such that the 12 g / m ² to 298 g / m ^2. After this application, it was dried at 60 ° C. for 90 minutes, and this was cut into 99 mm × 99 mm to obtain a sample.

(Example 7)
The amount of impregnation of the flame retardant agent with respect to the wooden substrate was 182 kg / m ³ in terms of solid content, the amount of clay paint applied was 495 g / m ² , and the solid content was 20 g / m ² . The rest is the same as Example 6 above.

(Example 8)
The amount of impregnation of the flame retardant agent with respect to the wood substrate was 178 kg / m ³ in terms of solid content. A clay paint was not applied to the surface of the flame retardant-impregnated wood base material, and the flame-retardant agent-impregnated wood base material itself was cut into 99 mm × 99 mm to prepare a sample.

(Example 9)
A cedar veneer having a thickness of 15 mm as a wooden substrate was cut into 99 mm × 99 mm to prepare a sample. In this example, the wood base material is not impregnated with a flame retardant, and no clay film is formed on the surface.

(Exothermic test)
A heat generation test using a cone calorimeter was performed on the samples of the above examples, and the total heat generation amount was examined. The result is shown in FIG.

Considering this result, the comparison between Example 4 and Example 5 shows that the wood substrate itself impregnated only with the phosphorus / nitrogen flame retardant 20 minutes as the amount of flame retardant impregnation increases. The total heating value during the heating time has decreased from 17.6 MJ / m ² to 7.1 MJ / m ² .

And as shown in Example 4, the amount of impregnation of the flame retardant agent into the wooden base material is small, and as it is, the total calorific value for the heating time of 20 minutes becomes 17.6 MJ / m ² and is stipulated in the Building Standard Law. even in a state that can not meet the criteria for a noncombustible material, by forming the clay layer on the surface thereof, the total calorific value ^{16.7MJ / m 2, 7.9MJ / m} 2, 5.7MJ / m 2 (Example 1, Example 2, Example 3), if the solid content (montmorillonite amount) of the clay film is set to 12 g / m ² or more, the total calorific value becomes 7.9 MJ / m ² or less. It can be seen that the standard of non-combustible material can be met (Example 2, Example 3).

On the other hand, when the flame retardant is a sodium polyborate flame retardant, as shown in Example 8, the amount of the flame retardant impregnated into the wooden substrate is small, and the total heat generation during the heating time of 10 minutes is left as it is. Even if the amount is 8.7 MJ / m ² and it does not meet the standards for quasi-incombustible materials stipulated in the Building Standards Act, the total calorific value is 6.5 MJ by forming a clay film on the surface. / M ² , 6.2 MJ / m ² , and if the solid content of the clay film (montmorillonite amount) is 12 g / m ² or more, the total calorific value is 6.5 MJ / m ² or less. It can be seen that the standard of the quasi-incombustible material specified can be satisfied (Example 6, Example 7).

[Test 2]
The relationship between the purity of high-purity bentonite or bentonite in the flame retardant and the total calorific value of the corn calorie exothermic test with respect to the purity was tested.

(Example 10)
Phosphorus / nitrogen-based flame retardant diluted to a solid content of 15% on a cedar veneer with a thickness of t = 15 mm as a wooden substrate (trade name “Nonen W-200” manufactured by Maruhishi Oil Chemical Co., Ltd.) ) Was impregnated by the reduced pressure method. In this depressurization method, the pressure was reduced in a vacuum batch type chamber for 1 hour, then returned to atmospheric pressure and maintained for 1 day for impregnation. Then, it was made to dry for 72 hours (3 days) with a 60 degreeC ventilation drier, and the flame retardant chemical | medical agent impregnation wooden base material with which 122 kg / m < ³ > of flame retardant chemical | medical agents was contained was obtained.

  The clay paint for forming the clay film is composed of 75.7 parts by weight of water, 10 parts by weight of urethane resin emulsion, 10 parts by weight of acrylic resin emulsion, 4 parts by weight of high-purity bentonite, 0.2 part by weight of antifoaming agent. Then, 0.1 parts by weight of a dispersing agent and 0.04 parts by weight of a fungicide were added and diffused until uniform. As the high purity bentonite, a montmorillonite content of 95% by weight was used.

The clay paint was applied to the surface of the flame retardant-impregnated wood base material by adjusting the coating amount to 300 g / m ² so that the solid content as the clay amount (montmorillonite) was 12 g / m ² . The ratio of the amount of montmorillo in the clay paint was calculated as 3.94% in the paint. After this application, it was dried at 60 ° C. for 90 minutes, and this was cut into 99 mm × 99 mm to obtain a sample.

(Example 11)
The amount of clay paint applied was 302 g / m ² . As the high purity bentonite, a montmorillonite content of 85% by weight was used. Other than that is the same as Example 10 above.

(Example 12)
The amount of impregnation of the flame retardant with respect to the wood substrate was 120 kg / m ³ in terms of solid content, and the amount of clay paint applied was 300 g / m ² . As the bentonite, one having a montmorillonite content of 75% by weight was used. Other than that is the same as Example 10 above.

(Example 13)
The amount of impregnation of the flame retardant with respect to the wood substrate was 120 kg / m ³ in terms of solid content, and the amount of clay paint applied was 301 g / m ² . As the bentonite, a montmorillonite content of 65% by weight was used. Other than that is the same as Example 10 above.

(Example 14)
The amount of impregnation of the flame retardant with respect to the wood substrate was 125 kg / m ³ in terms of solid content, and the amount of clay paint applied was 300 g / m ² . As the bentonite, one having a montmorillonite content of 50% by weight was used. Other than that is the same as Example 10 above.

(Exothermic test)
A heat generation test using a cone calorimeter was performed on the samples of Examples 10 to 14, and the total heat generation amount was examined. The result is shown in FIG.

Considering this result, if the content of montmorillonite as bentonite is 50% by weight, 65% by weight, or 75% by weight, the total calorific value for a heating time of 20 minutes exceeds 8.0 MJ / m ² ( Example 12 to Example 13) When a high-purity bentonite having a montmorillonite content of 85% by weight or more is used, the total calorific value for a heating time of 20 minutes is 6.0 MJ / m ² or less and 8.0 MJ / m ^2. (Examples 10 and 11), it can be seen that the standards for non-combustible materials specified in the Building Standards Law can be satisfied.

  The present invention can enhance the fireproofing performance of the fireproofing wood material by the synergistic effect of the flame retardance of the flameproofing agent impregnated in the wooden base material and the flame retardance of the clay film on the surface, impregnation of the flameproofing agent Even if it is in a state where certain flame retardant performance has not been obtained due to defects, the flame retardancy of the clay film on the surface can be compensated, and the flame retardant performance of the fireproof wood material can be obtained reliably and stably, so it is extremely Useful.

A Fire-resistant wood material 1 Wood material 1a Constituent material 3 Sealer layer 5 Clay film

Claims (11)

On the surface of the wooden base material impregnated with the water-based flame retardant, a non-water-based sealer layer having a waterproof property and a moisture-proof property for preventing the flame retardant from being eluted is provided.
A fireproof woody material characterized in that a clay film made of a water-based clay paint is formed on the surface of the sealer layer. In claim 1,
A fire-resistant wood material, wherein the clay film formed on the surface of the sealer layer is made of an aqueous paint containing a high-purity bentonite having a purity equal to or higher than a predetermined value and an aqueous resin, and has transparency. In claim 1 or 2,
A sealer layer is a fire-resistant wood material characterized by comprising a paint containing a filler. In any one of Claims 1-3,
A fire-resistant wood material characterized in that the sealer layer is made of a UV curable paint. In any one of Claims 2-4,
High-purity bentonite is a fireproof woody material characterized in that the purity is 85% by weight or more. In any one of Claims 2-5,
The flame retardant is a phosphorus flame retardant or a polyboric acid flame retardant,
A fire-resistant wood material, wherein the clay film is formed of high-purity bentonite so that the amount of montmorillonite is 12 g / m ² or more. In any one of Claims 1-6,
A fire-resistant wood material characterized in that the surface of a wood base material is made smooth by a smoothing treatment. In any one of Claims 1-7,
A wooden base material is a laminate of a plurality of constituent materials consisting of a wood veneer, chipboard or wood fiber board in the base material thickness direction,
A fire-resistant wood material, wherein only the constituent material of the outermost layer is impregnated with a flame retardant agent. In any one of Claims 1-8,
The wooden base material is impregnated with an amount of flame retardant that does not satisfy the standards for flame retardant materials stipulated in the Building Standards Law.
A fire-resistant wooden material characterized in that the fire-resistant performance of the clay film formed on the surface of the wooden substrate satisfies the standards of flame retardant materials stipulated in the Building Standard Law. In any one of Claims 1-8,
The wooden base material is impregnated with an amount of flame retardant that does not satisfy the standards of quasi-incombustible materials stipulated in the Building Standards Law,
A fireproof wooden material characterized in that the fireproof performance of the clay film formed on the surface of the woody base material is configured to satisfy the standards of quasi-incombustible materials stipulated in the Building Standard Law. In any one of Claims 1-8,
The wooden base material is impregnated with an amount of flame retardant that does not satisfy the standards for non-combustible materials specified in the Building Standards Law,
A fire-resistant wooden material characterized by being configured to satisfy the standards of non-combustible materials stipulated in the Building Standard Law by the fire-proof performance of the clay film formed on the surface of the wooden substrate.

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