JP6556213B2 - Production method of incombustible wood - Google Patents

Description

    The present invention relates to a method for producing incombustible wood.

    2. Description of the Related Art Conventionally, a technique for making wood incombustible has been developed by impregnating wood used for interior materials and exterior materials of buildings with a non-combustible chemical solution (see Patent Document 1 below).

    In Patent Document 1, a base material made of a wood material is dipped in an incombustible chemical solution made of an aqueous solution of an incombustible chemical, and the base material is impregnated with the incombustible chemical solution, and then the base material is dried (of the incombustible chemical solution). A method for producing non-combustible wood in which a non-combustible chemical is contained in the entire substrate by evaporating water) is disclosed.

    By the way, since the incombustible chemical impregnated in the incombustible treatment is usually water-soluble, there is a possibility that a so-called white flower phenomenon occurs in which moisture is absorbed and dissolved to the surface of the wood and crystallizes to whiten the wood surface. When the white flower phenomenon occurs on the surface of the base material, the appearance is poor and the commercial value is lowered.

    Therefore, by applying paint on the surface of the base material that has been subjected to incombustibility treatment and forming a coating film that inhibits the ingress of moisture on the surface of the base material, the moisture absorption of the base material itself is suppressed, thereby preventing the white flower phenomenon. Measures to prevent white flowers from occurring are being taken.

Japanese Patent No. 4446071

    However, in the case of a base material that has been subjected to incombustibility treatment, when a coating is applied, the presence of an incombustible chemical on the surface makes it difficult for the coating film to adhere to the surface of the base material, which may cause peeling of the coating film. It was. When the coating film is peeled off, the appearance is poor and the commercial value is lowered, and the effect of suppressing moisture absorption by the coating film is lost, and the white flower phenomenon cannot be suppressed.

    This invention is made | formed in view of this point, The objective adds a device to the manufacturing method of the incombustible wood by which the surface of the base material was painted, and forms a coating film with high adhesiveness. Is to be able to.

    In order to achieve the above object, in the present invention, before the surface of the base material impregnated with the incombustible agent is coated, the incombustible agent on the surface of the base material is washed away.

    Further, the inventors of the present application can wash away the incombustible agent on the surface of the base material by washing the surface of the base material after the incombustible treatment in which the base material contains an incombustible chemical agent. When drying (to evaporate the moisture of the noncombustible chemical contained in the base material), the nonflammable chemical contained in the base material oozes out to the surface of the base material together with the evaporating water, and the base material in the painting process It has been found that there is a problem of reducing the adhesion of the coating film formed on the surface of the film.

    Therefore, in the present invention, after the base material is made incombustible, the surface of the base material is washed and dried, and then the surface of the base material is further washed before coating the surface of the base material. The substrate was dried. That is, after the end of the substrate incombustibility treatment step, the cleaning step for cleaning the surface of the substrate and the drying step for drying the substrate are alternately performed twice before the coating step.

    Specifically, the method for producing an incombustible wood according to the first invention includes an incombustible treatment step in which a wooden substrate is impregnated with an incombustible chemical solution composed of an aqueous solution of an incombustible agent, and after completion of the incombustible treatment step, A first cleaning step for cleaning the surface of the substrate; a first drying step for drying the substrate after completion of the first cleaning step; and a first cleaning step for cleaning the surface of the substrate after completion of the first drying step. 2 cleaning steps, a second drying step for drying the substrate after completion of the second cleaning step, and a coating step for applying and applying a paint to the surface of the substrate after the completion of the second drying step. It is characterized by having.

    In the first invention, after the completion of the incombustible treatment step for impregnating the base material with the incombustible chemical solution, the cleaning is performed to wash the surface of the base material before the coating step for applying the paint on the surface of the base material and performing the coating process. The process and the drying process for drying the substrate are alternately performed twice. According to such a manufacturing method, after performing the first cleaning step for the first time, when performing the first drying step, the moisture of the incombustible chemical solution in which the nonflammable chemical contained in the base material is impregnated inside the base material. Even if it oozes out to the surface of the base material along with the evaporation, the non-combustible chemical is removed from the surface layer portion including the surface of the base material by performing the second second cleaning step. For this reason, in the subsequent second drying step, the water that has permeated the surface layer portion of the base material in the second cleaning step is evaporated in a state where there is almost no non-combustible chemical in the surface layer portion of the base material, and the base material is dried. The substrate can be dried with almost no drug oozing out onto the surface of the substrate. Therefore, in the subsequent painting process, a coating film is formed with almost no incombustible agent exuding on the surface of the base material, so a highly adhesive coating film is formed on the surface of the base material impregnated with the incombustible agent. can do.

    Moreover, according to the said manufacturing method, after completion | finish of an incombustible treatment process, a coating process with high adhesiveness is easy on the surface of a base material only by performing twice a washing | cleaning process and a drying process before performing a coating process. Therefore, the non-combustible wood that is difficult to absorb moisture can be easily produced by the coating film having high adhesion being a barrier that inhibits the ingress of moisture. That is, according to the manufacturing method described above, it is possible to easily manufacture a non-combustible wood having a good appearance in which a white flower phenomenon due to moisture absorption of the base material hardly occurs.

    According to a second invention, in the first invention, in the second cleaning step, the surface of the base material is cleaned by spraying steam on the surface of the base material.

    In 2nd invention, it decided to perform the 2nd washing | cleaning process before a coating process by the vapor | steam washing | cleaning which sprays a vapor | steam on the surface of a base material, and wash | cleans this surface. Steam cleaning requires less water in the substrate after cleaning than when cleaning with water. Therefore, by employing steam cleaning in the second cleaning step, the drying time in the second drying step can be shortened, and production efficiency can be improved.

According to a third invention, in the first or second invention, in the second drying step, the base material is forcedly dried by placing the base material in a dryer having a temperature equal to or higher than room temperature and allowing it to stand for a predetermined time. It is characterized by making it.

    In the third invention, by forcibly drying the base material in the second drying step, evaporation of the washing water is promoted and the base material can be dried in a short time compared to the case where the base material is naturally dried. .

    By the way, in the second cleaning step, the cleaning water contained in the surface layer portion of the base material is not dried in a short time as described above. There is a possibility that the cleaning water in the surface layer of the base material penetrates into the base material without evaporating, and the incombustible chemical contained in the base material dissolves in the cleaning water and elutes together with the cleaning water on the surface of the base material.

    However, according to the third invention, as described above, the base material is forced to dry in the second drying step, so that the cleaning water contained in the surface layer portion of the base material is quickly evaporated to achieve the base. It is possible to suppress penetration into the interior of the material, suppress re-dissolution of the incombustible agent inside the substrate, and suppress elution of the incombustible agent on the substrate surface.

    According to a fourth invention, in any one of the first to third inventions, the surface of the substrate becomes an uneven rough surface after the end of the incombustibility treatment step and before the second cleaning step. Thus, a roughening treatment step for processing the surface of the substrate is provided.

    In 4th invention, since the surface area to which a coating film adheres increases by forming the surface of a base material in an uneven rough surface, coating-film adhesiveness can be improved more.

    As described above, according to the present invention, after the completion of the incombustibility treatment process of the base material, the cleaning process for cleaning the surface of the base material and the drying process for drying the base material are alternately performed before the coating process is performed. By performing twice, the coating process can be performed with almost no incombustible agent oozing out on the surface of the base material, so a highly adherent coating film is formed on the surface of the base material impregnated with the incombustible agent. can do.

    In addition, according to the present invention, a coating film having high adhesion can be easily formed on the surface of the base material by performing the washing step and the drying step twice alternately after the completion of the incombustibility treatment step and before the coating step. Therefore, it is possible to easily produce an incombustible wood having a good appearance in which a white flower phenomenon due to moisture absorption of the substrate hardly occurs.

FIG. 1 is a cross-sectional view showing the structure of incombustible wood according to Embodiment 1 of the present invention. FIG. 2 is a flowchart showing a method for producing non-combustible wood according to Embodiment 1 of the present invention. FIG. 3A is a diagram illustrating a state of a base material in each step constituting the method for producing a non-combustible wood according to Embodiment 1 of the present invention, and (a) impregnates the base material with a non-combustible chemical in the incombustible treatment step (B) shows the state of cleaning the surface of the substrate in the first cleaning step, (c) shows the state of drying the substrate in the first drying step, ( d) shows a state where the surface of the substrate is processed into a rough surface in the roughening treatment step. FIG. 3B is a diagram showing the state of the base material in each step constituting the method for producing non-combustible wood according to Embodiment 1 of the present invention, and (e) cleans the surface of the base material in the second cleaning step. (F) shows a state where the substrate is dried in the second drying step, and (g) shows a state where a coating layer is formed on the surface of the substrate in the coating step. Yes.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are merely preferred examples in nature, and are not intended to limit the scope of the present invention, its application, or its use.

Embodiment 1 of the Invention
FIG. 1 shows a non-combustible wood 10 impregnated with a non-combustible chemical according to Embodiment 1 of the present invention, and this non-combustible wood 10 is used for, for example, an interior material or an exterior material of a building.

−Configuration−
The incombustible wood 10 has a flat substrate 11 made of a wood material and a coating layer 12 (coating) formed on the surface which is one side thereof.

[Base material]
As the base material 11, solid wood, solid laminated wood, laminated wood can be used, and the tree species is not limited. For example, hard tree species such as oak, birch, beach and cherry, and soft tree species such as cedar, tsuga, hinoki and sawawagurumi are used. The base material 11 is formed in a flat plate-like body having a thickness of about 12 to 50 mm, for example.

    The base material 11 contains an incombustible chemical as a whole except for the surface layer portion. As the incombustible agent, generally used water-soluble flame retardants such as phosphoric acid type, boric acid type, boric acid / phosphoric acid complex type, phosphorus nitrogen type and the like are applied. In this embodiment, guanidine phosphate is used as an incombustible agent.

    Moreover, the base material 11 is formed in the rough surface of uneven | corrugated surface 11a by the roughening process mentioned later.

[Coating layer]
The coating film layer 12 is formed of a coating agent having a resin component. The coating layer 12 is formed on the surface 11a by applying a coating made of, for example, an acrylic transparent resin or a urethane transparent resin to the surface 11a of the substrate 11.

-Manufacturing method-
Hereinafter, the manufacturing method of the incombustible wood 10 which concerns on Embodiment 1 of this invention is demonstrated based on FIG.2, FIG.3A and FIG.3B.

    The method for producing the incombustible wood 10 includes an incombustible processing step S1, a first cleaning step S2, a first drying step S3, a cutting and polishing step S4, a roughening processing step S5, and a second cleaning step S6. The second drying step S7 and the coating step S8. In addition, the order of the process demonstrated below is only an example, and the manufacturing method which concerns on this invention is not restricted to this.

(1) Incombustible treatment process First, incombustible treatment process S1 is performed. In the incombustible treatment step S1, an incombustible treatment is performed by impregnating the base material 11 made of wood with an incombustible chemical solution that is an aqueous solution of an incombustible chemical to obtain incombustible wood. In this embodiment, the base material 11 is incombustible by the reduced pressure press impregnation process.

    Specifically, first, the base material 11 is placed in a pressure vessel composed of, for example, a vacuum batch type chamber, the pressure vessel is depressurized to -0.07 MPa, and the state is maintained for 30 minutes (decompression treatment). ). By this decompression process, air contained in the conduit of the base material 11 is removed. Thereafter, the incombustible chemical solution is injected into the pressure vessel and the inside of the pressure vessel is pressurized to 1 MPa while the base material 11 is immersed in the incombustible chemical solution, and the state is maintained for 1 hour (pressure treatment). Then, it returns to atmospheric pressure, and is left to stand for 2 hours in the state immersed in the incombustible chemical | medical solution. As a result, the incombustible chemical solution penetrates into the gap of the base material 11 such as the conduit.

    By performing the incombustible treatment step S1 as described above, the base material 11 is impregnated with the incombustible chemical solution (state (a) in FIG. 3A).

(2) First Cleaning Step Next, a first cleaning step S2 is performed. In the first cleaning step S2, the surface 11a of the base material 11 impregnated with the incombustible chemical solution in the incombustible treatment step S1 is cleaned. Specifically, cleaning water (water or a water-soluble liquid containing a trace amount of additives such as an acid, an alkali, a surfactant, etc., tap water in this embodiment) is poured over the surface 11a of the substrate 11. Thereby, the incombustible chemical solution on the surface 11a of the substrate 11 is washed away (state (b) in FIG. 3A).

    In addition, you may wash | clean the surface 11a of the base material 11 with the heated washing water. By heating the washing water, the dissolution rate of the incombustible chemical in the washing water is increased, so that the washing efficiency is increased.

(3) 1st drying process Next, 1st drying process S3 is performed. In the first drying step S3, after impregnating the aqueous solution of the non-combustible drug, the base material 11 from which the surface 11a has been cleaned is dried (state (c) in FIG. 3A). For example, the base material 11 is forcibly dried by placing the base material 11 in a dryer at 60 ° C. for about two weeks.

(4) Cutting and polishing step Next, a cutting and polishing step S4 is performed. In the cutting and polishing step S4, first, the base material 11 is cut with a molder or the like, and the base material 11 is formed into the shape of the final product. Thereafter, the surface 11a of the substrate 11 is polished with a polishing paper or the like. Usually, the cut surface of the wood is in a standing state, but by this cutting and polishing step S4, the surface 11a of the base material 11 is not brought up and becomes smooth.

    The cutting and polishing step S4 may be divided into a cutting step and a polishing step, and the cutting step may be performed before the incombustibility treatment step S1.

(5) Roughening treatment step Next, a roughening treatment step S5 is performed. In the roughening treatment step S5, the surface 11a of the substrate 11 that has become smooth by polishing is processed so as to be a rough surface. In this embodiment, as shown in FIG. 3A (d), the surface 11a of the base material 11 is processed into a fine uneven rough surface by hitting the sand 21 against the surface 11a of the base material 11 by the sandblasting 20. Is done. The roughening treatment step S5 is not an essential step in the method for producing non-combustible wood according to the present invention, and may be omitted. In this embodiment, in order to further improve the coating film adhesion. Is going.

(6) Second Cleaning Step Next, a second cleaning step S6 is performed. In 2nd washing | cleaning process S6, the surface 11a of the base material 11 processed into the rough surface by roughening process process S5 is wash | cleaned. Specifically, the surface 11a of the substrate 11 is washed by spraying about 100 g / m ² of washing water on the surface 11a of the substrate 11 with a spray and scraping off the washing water remaining on the surface 11a. Thereby, the unnecessary nonflammable chemical | medical agent of the surface 11a of the roughened base material 11 is washed away (state (e) of FIG. 3B).

    Here, before performing 2nd washing | cleaning process S6, the nonflammable chemical | medical agent exists in the surface 11a of the base material 11 (refer (c) and (d) of FIG. 3A). This is because, after the incombustible treatment step S1, the incombustible chemical on the surface 11a of the base material 11 is washed away by the first cleaning step S2, but when the base material 11 is dried in the first drying step S3, This is because the incombustible chemical contained therein oozes out to the surface 11a of the base material 11 together with the water that evaporates (see (c) in FIG. 3A).

    In the second cleaning step S6, as described above, the surface layer including the surface 11a of the base material 11 by cleaning the surface 11a from which the incombustible chemical has exuded from the inside of the base material 11 together with the water evaporated in the first drying step S2. Incombustible chemicals are removed from the part.

    In addition, this 2nd washing | cleaning process S6 wash | cleans with the above-mentioned washing water, and sprays the warming washing water or vapor | steam on the surface 11a of the roughened base material 11, and roughens the base material 11 It is good also as washing away the unnecessary nonflammable medicine of the surface 11a of the. In particular, in the case of steam cleaning in which steam is blown, the incombustible chemical on the surface 11a of the substrate 11 is washed away by the moisture of the high-temperature steam sprayed on the surface 11a of the substrate 11. According to such steam cleaning, the amount of moisture absorbed by the base material 11 after cleaning is smaller than when cleaning with cleaning water. Therefore, the base material 11 can be dried in a short time in the subsequent second drying step S7.

(7) Second drying step Next, a second drying step S7 is performed. In the second drying step S7, the base material 11 that has absorbed the cleaning water in the second cleaning step S6 is dried (state (f) in FIG. 3B). In the second drying step S7, the substrate 11 is forcedly dried (air-dried) by placing the substrate 11 in a dryer having a temperature equal to or higher than room temperature and leaving it for a predetermined time. For example, the base material 11 after the second cleaning step S6 is placed in a dryer at 60 ° C. and left for 20 minutes to evaporate the cleaning water contained in the surface layer portion of the base material 11 and forcibly dry the base material 11. Let

    In the first drying step S3, since the incombustible chemical solution has been infiltrated into the base material 11 by the incombustible treatment step S1, the base is accompanied by evaporation of the moisture of the incombustible chemical solution contained in the base material 11. Although there was a possibility that part of the incombustible chemical inside the material 11 oozes out to the surface 11a, in the second drying step S7, the moisture of the incombustible chemical liquid soaked into the base material 11 by the incombustible treatment step S1 is Since it has already evaporated in the first drying step S3, it is only necessary to evaporate the cleaning water that has slightly penetrated into the surface layer portion of the substrate 11 in the second cleaning step S6.

    Further, as described above, when the first drying step S3 is performed after the first cleaning step S2, the nonflammable chemical liquid impregnated with the incombustible chemical contained in the base 11 is contained. Even if the surface 11a of the base material 11 oozes with the evaporation of moisture, the incombustible chemical is removed from the surface layer portion including the surface 11a of the base material 11 by performing the second cleaning step S6.

    As described above, in the second drying step S7, there is almost no incombustible chemical in the surface layer portion of the base material 11, and the moisture of the incombustible chemical liquid that has penetrated into the base material 11 has already evaporated, and the second cleaning step S6 The washing water that has permeated the surface layer of the material 11 is evaporated to dry the substrate 11. That is, in the second drying step S7, unlike the first drying step S3, it is not necessary to evaporate the moisture of the incombustible chemical liquid impregnated inside the base material 11, and the surface layer portion of the base material 11 by the second cleaning step S6. Since it is only necessary to evaporate only some of the washing water contained in the base material 11, the base material 11 can be dried with almost no non-flammable drug oozing out on the surface 11 a of the base material 11.

    In the second drying step S7, the substrate 11 is forcibly dried using a dryer. Therefore, the cleaning water contained in the surface layer portion of the base material 11 in the second cleaning step S7 can be evaporated more quickly than when the base material 11 is naturally dried.

    By the way, in the second cleaning step S7, the cleaning water contained in the surface layer portion of the base material 11 is not dried in a short time as described above. Then, the cleaning water in the surface layer portion of the base material 11 penetrates into the base material 11 without evaporating, and the incombustible chemical contained in the base material 11 dissolves in the cleaning water and forms the base water 11 together with the cleaning water. There is a risk of elution on the surface 11a.

    On the other hand, in this embodiment, since the base material 11 is forcedly dried in the second drying step S7 as described above, the cleaning water contained in the surface layer portion of the base material 11 is quickly evaporated. Thus, penetration into the inside of the base material 11 can be suppressed, re-dissolution of the incombustible drug inside the base material 11 can be suppressed, and elution of the non-flammable medicine on the surface 11a of the base material 11 can be suppressed.

(8) Painting process Next, painting process S8 is performed. In the painting step S8, the paint is applied to the surface 11a of the substrate 11 dried in the second drying step S7 to form the coating layer 12 covering the surface 11a of the substrate 11 (state (g) in FIG. 3B). ).

    At this time, since the surface 11a of the base material 11 is processed into a fine uneven surface in the roughening treatment step S5, the surface area to which the paint adheres is increased, and the adhesion of the coating layer 12 is improved. To do.

    In addition, as described above, the surface of the base material 11 in a state in which the nonflammable agent hardly oozes out on the surface 11a of the base material 11 by the first cleaning process, the first drying process, the second cleaning process, and the second drying process. 11a will be painted. Therefore, the coating layer 12 having high adhesion can be formed on the surface 11a of the base material 11 impregnated with the nonflammable chemical.

    Through the above steps, the nonflammable wood 10 is formed in which the nonflammable agent is contained in the base material 11 and the surface 11a of the base material 11 is covered with the coating layer 12 having high adhesion, which hardly causes the white flower phenomenon. .

-Effect of Embodiment 1-
As described above, according to the manufacturing method of the first embodiment, after the end of the incombustible treatment step S1 for impregnating the base material 11 with the incombustible chemical solution, the coating is performed by applying the paint to the surface 11a of the base material 11 Before performing step S8, cleaning steps S2 and S6 for cleaning the surface 11a of the substrate 11 and drying steps S3 and S8 for drying the surface 11a of the substrate 11 are alternately performed twice. According to such a manufacturing method, the incombustible chemical contained in the base material 11 in the incombustible treatment step S1 is the first drying step that is the first drying step after the first first cleaning step S2. Even when the incombustible chemical contained in the base material 11 oozes out on the surface 11a of the base material 11 as the moisture of the non-combustible chemical liquid impregnated in the base material 11 evaporates when performing S3, 2 By performing the second cleaning step S6 for the second time, the incombustible chemical is removed from the surface layer portion including the surface 11a of the base material 11. Therefore, in the subsequent second drying step S7, the moisture permeated into the surface layer portion of the base material 11 by the second cleaning step S6 is evaporated in a state where there is almost no non-combustible chemical in the surface layer portion of the base material 11, thereby drying the base material 11 Therefore, the base material 11 can be dried without causing the nonflammable drug to ooze out almost on the surface 11a of the base material 11. Therefore, in the subsequent coating step S8, the coating layer 12 is formed in a state in which the nonflammable agent hardly oozes out on the surface 11a of the base material 11, so that it adheres to the surface 11a of the base material 11 impregnated with the nonflammable agent. It is possible to form the coating layer 12 having high properties.

    Moreover, according to the manufacturing method of this Embodiment 1, after completion | finish of incombustible treatment process S1, it adheres to the surface 11a of the base material 11 only by repeating a washing | cleaning process and a drying process twice before performing coating process S8. Since the coating layer 12 having high adhesion can be easily formed, the non-combustible wood 10 that is difficult to absorb moisture can be easily manufactured by the coating layer 12 having high adhesion acting as a barrier that prevents moisture from entering. Can do. That is, according to the manufacturing method described above, it is possible to easily manufacture the non-combustible wood 10 having a good appearance in which the white flower phenomenon due to moisture absorption of the base material 11 hardly occurs.

    As described above, the second cleaning step S6 of the first embodiment may be performed by steam cleaning that sprays steam onto the surface 11a of the base material 11 to clean the surface 11a. As a result, the amount of water absorbed by the substrate 11 after washing is smaller than when washing with water. Therefore, in the second drying step S7 after the second cleaning step S6, the substrate 11 can be dried in a short time because the drying load on the substrate 11 is reduced.

    Moreover, according to the manufacturing method of this Embodiment 1, it is supposed that the base material 11 is forcedly dried in 2nd drying process S7 after 2nd washing | cleaning process S6. Therefore, compared with the case where the base material 11 is naturally dried, the evaporation of the cleaning water contained in the surface layer portion of the base material 11 is promoted by the second cleaning step S6, and the base material 11 can be dried in a short time. .

    By the way, in the second cleaning step S6, the cleaning water contained in the surface layer portion of the base material 11 is not dried in a short time as described above, for example, when it is naturally dried over a long time, particularly under conditions of high humidity. Then, the cleaning water in the surface layer portion of the base material 11 penetrates into the base material 11 without evaporating, and the incombustible chemical contained in the base material 11 dissolves in the cleaning water and forms the base water 11 together with the cleaning water. There is a risk of elution on the surface 11a.

    However, according to the manufacturing method of the first embodiment, as described above, the base material 11 is forcibly dried in the second drying step S7, and thus the cleaning water contained in the surface layer portion of the base material 11 is quickly discharged. It is possible to suppress the penetration into the inside of the base material 11 by evaporating the base material 11, suppress the re-dissolution of the incombustible medicine inside the base material 11, and suppress the elution of the non-flammable medicine on the surface 11 a of the base material 11. .

    Further, as in the manufacturing method of the first embodiment, the surface 11a of the base material 11 is roughened by sandblasting or the like after the incombustibility treatment step S1 and before the second cleaning step S6. In the case of forming on the rough surface, the surface area to which the coating layer 12 adheres to the surface 11a of the substrate 11 is increased, and the coating film adhesion can be further improved.

<< Other Embodiments >>
In the said embodiment, the guanidine phosphate was used as an example of the nonflammable medicine which concerns on this invention. However, the incombustible agent according to the present invention may be an incombustible agent other than guanidine phosphate as described above. For example, water-soluble flame retardants such as phosphoric acid, boric acid, boric acid / phosphoric acid complex, and phosphorous nitrogen can be used as the nonflammable agent according to the present invention.

    In the above embodiment, the roughening treatment step S5 is performed between the first drying step S3 and the second cleaning step S4. However, the roughening treatment step S5 may not be performed. The roughening treatment step S5 is not essential for the production method according to the present invention, and can be performed as necessary in order to further enhance the coating film adhesion.

    Moreover, in the said embodiment, the roughening process process S5 which processes the surface 11a of the base material 11 so that the surface 11a of the base material 11 became an uneven rough surface was performed by sandblasting. However, the roughening treatment step S5 may be any treatment using any apparatus as long as the surface 11a of the base material 11 is changed to an uneven rough surface. It may be a process of damaging the surface 11a of the base material 11 with a sander or a roll press, or a process of modifying the surface layer portion of the base material 11 to be porous.

    In the said embodiment, in the 2nd washing | cleaning process S6, it was supposed that the nonflammable chemical | medical agent impregnated in the surface layer part of the base material 11 with the washing water or the steam was washed away, but it is good also as washing with both the washing water and the steam.

    In addition, the drying conditions (temperature, time, etc.) of the second drying step S7 are not limited to the conditions of the above-described embodiment, and an appropriate test is performed, and the base material 11 quickly dries to the surface 11a of the base material 11. What is necessary is just to obtain | require the drying conditions which the elution of a nonflammable chemical | medical agent generate | occur | produces, and this inventor conducted the following tests.

(Test example)
With respect to the test base material 11 that has finished the second washing step S6, the temperature of the dryer is set to 40 ° C. and 60 ° C., and the time until the base material 11 is dried (the water content becomes the air dry water content) is measured. did. Specifically, two types (A: 297 kg / m ³ , B: 413 kg / m ³ ) of test base materials 11 with different amounts of nonflammable chemicals to be impregnated (drug amount) are prepared, and the second cleaning step As S6, 100 g / m ² of washing water is applied to the surface 11a, the washing water of the surface 11a is scraped off with a waste cloth, and then put into a dryer, and the surface of the substrate 11 is measured with an electric moisture meter at regular intervals. While measuring the moisture content of 11a, the wetness was evaluated by tactile sensation.

    As a result, when the temperature of the dryer is 40 ° C., the moisture content of the surface 11a of the base material 11 is 12.5 minutes, and the moisture content in the air-dried state (A: 12.2%, B: 15. 0%) or less (A: 11.7%, B: 13.5%). On the other hand, when the temperature of the dryer is 60 ° C., the water content of the surface 11a of the base material 11 is 5% or less in the air-dried state (A: 10.6%, B: 12.5%). became. The tactile sensation was evaluated as a dry state (dry state) in 10 minutes when the temperature of the dryer was 40 ° C., and was evaluated as a dry state (dry state) in 5 minutes at 60 ° C. When the temperature of the dryer is 40 ° C., the moisture content (A: 12.8%, B: 14.6%) of the base material 11 after 10 minutes has passed, while (B) is in an air-dried state. The moisture content was lower than the moisture content, while the other (A) was higher than the moisture content in the air-dried state, but near the moisture content in the air-dried state. In addition, when any of the test substrates 11 has a dryer temperature of 40 ° C., the drying time is 10 minutes or more, and when the dryer temperature is 60 ° C., the drying time is 5 minutes or more. No deposit of nonflammable drug (white spots) was observed on the surface 11a.

    As described above, the second drying step S7 is required to have a drying time of 10 minutes or more when the temperature of the dryer is 40 ° C. and 5 minutes or more when the temperature of the dryer is 60 ° C. It was.

(Comparative test example)
In order to contrast with the above test, the test substrate 11 that has finished the second cleaning step S6 is left to stand overnight in an environment at room temperature of 23 ° C. and a relative humidity of 50% (assuming natural drying environment conditions). A test was conducted. As a result, after the base material 11 was dried, a nonflammable drug was deposited on the surface 11a, and white spots were formed on the surface 11a. Moreover, when coating process S8 was performed with respect to this base material 11, it was verified that the coating-film adhesiveness with respect to the surface 11a of the base material 11 is low, and peeling arises. The adhesion of the coating film was low even at a location where the non-combustible chemical was not deposited on the surface 11a of the substrate 11.

    In addition, when the test substrate 11 that has completed the second cleaning step S6 is left in a dryer at 105 ° C. for 3 minutes and the coating step S8 is performed, the coating film adhesion to the surface 11a of the substrate 11 is determined. It is verified by tests that the film is good (no peeling occurs).

    As described above, the present invention is useful for a method for producing incombustible wood.

10 Incombustible wood
11 Base material
11a surface
12 Coating layer (coating)

Claims (4)

An incombustible treatment process in which a wooden substrate is impregnated with an incombustible chemical solution composed of an aqueous solution of an incombustible chemical;
A first cleaning step for cleaning the surface of the base material after completion of the incombustible treatment step;
A first drying step of drying the substrate after the first cleaning step;
A second cleaning step for cleaning the surface of the substrate after the completion of the first drying step;
A second drying step of drying the substrate after the second cleaning step;
A method for producing incombustible wood, comprising: a coating step of applying a paint on the surface of the base material after the second drying step. Above SL In the second washing step, the manufacturing method of the non-flammable timber according to claim 1, characterized in that by blowing steam on the surface of the substrate to clean the surface of the substrate. Above Symbol second drying step, according to claim 1 or 2, characterized in that force drying the substrate by leaving for a predetermined time to put the base on the dryer at room temperature or higher temperatures A method for producing incombustible wood. After completion of the above SL fireproofing treatment step, prior to the second cleaning step, comprises a roughening step of the surface of the substrate to processing the surface of the substrate such that uneven rough surface The method for producing incombustible wood according to any one of claims 1 to 3, wherein:

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