JP2008023818A - Manufacturing method of woody molded article, woody structural material, interior finishing material for vehicle and structural acoustic material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a woody molded article, which can give a molded article having a desired three-dimensional shape, excellent in the dimensional stability of wood, and hardly causes the oozing of a resin due to high humidity. <P>SOLUTION: The manufacturing method of the woody molded article comprises an impregnation process wherein an aqueous resin solution 3 containing a resin component consisting of a three or more functional glycidyl ether resin and a difunctional aqueous epoxy resin or containing a resin component containing a three or more functional aqueous glycidyl ether resin is impregnated into a plate-like wood 1 to form a resin-impregnated wood 4; a bending process for deforming the resin-impregnated wood 4; and a curing process wherein the resin component is cured to fix the shape of the resin-impregnated wood 4 and form the molded article. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a wooden molded body, and a wooden structure material, a vehicle interior material, and an acoustic structural material processed by the method for manufacturing a wooden molded body.

Since wood is a material with low dimensional stability, it has been conventionally required to improve the dimensional stability of wood.
As a technique for improving the dimensional stability of wood, for example, a method of impregnating wood with polyethylene glycol (PEG) is well known. However, wood impregnated with polyethylene glycol (PEG) has a high hygroscopic property, and has a problem that PEG oozes out by moisture and PEG is leached into water. In order to solve this problem, a method has been proposed in which wood is impregnated with an aqueous solution of a water-soluble epoxy compound having two or more epoxy groups in the molecule and a polymerization catalyst, and the epoxy compound is polymerized and cured (for example, Patent Document 1).
Japanese Patent No. 3198471

  However, even when the method described in Patent Document 1 is used, the leaching of the epoxy compound impregnated into the wood into water could not be sufficiently prevented. In particular, wood having a thickness of 1 mm or less suitable for bending is problematic because the leaching of the epoxy compound is significant.

  The present invention has been made in view of the above circumstances, and is a wooden molded body that has a desired three-dimensional shape, is excellent in dimensional stability of wood, and is less likely to ooze out resin due to humidity. It aims at providing the manufacturing method of. Moreover, it aims at providing the wooden structure material which consists of a molded object processed with the manufacturing method of the said wooden molded object. Moreover, it aims at providing the interior material for vehicles using the said wooden structure material, and the structural material for sound.

In order to achieve the above object, the present invention employs the following configuration.
The method for producing a woody molded product of the present invention comprises an impregnation step of impregnating a plate-like wood with a resin aqueous solution containing a resin component comprising a tri- or higher functional glycidyl ether resin and a bifunctional aqueous epoxy resin, and the resin aqueous solution. A bending process for deforming the wood after impregnating the resin, and a curing process for curing the resin component to form a molded body simultaneously with the bending process or after the bending process. And
Further, in the method for producing a woody molded product of the present invention, a plate-like wood is impregnated with a resin aqueous solution containing a resin component containing a tri- or higher functional aqueous glycidyl ether resin, and the resin aqueous solution is impregnated. It comprises a bending step for deforming the later wood, and a curing step for curing the resin component to form a molded body simultaneously with the bending step or after the bending step.

The method for producing a woody molded body may be a method in which the aqueous resin solution contains a curing agent.
Moreover, the manufacturing method of the said wooden molded object can be set as the method of making the wood after impregnating the said resin aqueous solution impregnate the hardening solution containing the said hardening | curing agent before the said hardening process.

In the method for producing a woody molded body, a plurality of pieces of the wood after impregnated with the aqueous resin solution are overlapped and deformed in the bending step, and the plurality of pieces of wood are brought into close contact with each other in the curing step. It can be set as the method characterized by this.
Moreover, the manufacturing method of the said wooden molded object can be set as the method characterized by the thickness of the said wood being 0.1-1 mm.
Furthermore, the manufacturing method of the said wooden molded object can be made into the method whose number average molecular weights of a bifunctional aqueous epoxy resin are 300-2500.

Moreover, the manufacturing method of the said wooden molded object can be set as the method of arrange | positioning a built-in backup material between these several timbers in the said bending process.
Further, in the above-described method for producing a wooden molded body, in the bending step, the wood after impregnated with the resin aqueous solution is impregnated with the aqueous resin solution while deforming the wood along the shape of the external backup material. The outer surface of the wood and the external backup material can be bonded.
In the manufacturing method of the said wooden molded object, it can be set as the method provided with the process of injection-molding an external backup material on the outer surface of the said molded object after the said hardening process.
Moreover, the manufacturing method of the said wooden molded object can be set as the method of providing the process of adhere | attaching an external backup material on the outer surface of the said molded object after the said hardening process.

The wooden structure material of the present invention is characterized by comprising a molded body manufactured by any one of the above-described methods for manufacturing a wooden molded body.
Moreover, the vehicle interior material and the acoustic structural material of the present invention are characterized by comprising the woody structural material of the present invention.

  According to the method for producing a woody molded body of the present invention, as a resin aqueous solution impregnated in wood, a resin component comprising a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, or a trifunctional or higher aqueous glycidyl is used. By using a resin component containing an ether resin and impregnating a plate-like wood with a resin aqueous solution to impregnate the resin (hereinafter referred to as “resin-impregnated wood”), and curing the resin component Because it is a molded body, for example, compared to the case where the resin component is composed of only a bifunctional aqueous epoxy resin, the molding has excellent dimensional stability of wood, high surface hardness, and resistance to resin bleeding due to humidity. The body is obtained.

The method for producing a woody molded body of the present invention includes a bending process for deforming the resin-impregnated wood, and a curing process for fixing the shape of the resin-impregnated wood by curing the resin component to obtain a molded body. Therefore, a molded body having a desired three-dimensional shape can be obtained. In general, when bending a resin-impregnated wood, a thin wood is used to prevent cracking of the wood due to the bending. However, the conventional technique has a problem that the leaching of the resin impregnated in the wood becomes more remarkable when the thickness of the wood is reduced. On the other hand, in the method for producing a woody molded body of the present invention, as described above, since resin exudation due to humidity does not easily occur, a thin wood can be used, and a wood having an appropriate thickness dimension can be used. It is possible to obtain a molded body having a desired three-dimensional shape. Therefore, it becomes a manufacturing method of a wooden molded object with a very high degree of freedom of a three-dimensional shape.
Moreover, in the manufacturing method of the wooden molded object of this invention, since it can fix in the state which fully swelled wood, the dimension of wood does not change with subsequent moisture absorption, and the outstanding dimensional stability is obtained.

  Furthermore, in the method for producing a woody molded product of the present invention, the resin component includes a resin component composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, or a trifunctional or higher aqueous glycidyl ether resin. Since it is a resin component, the resin aqueous solution is sufficiently impregnated into the wood and the wood can be sufficiently swollen, so that it becomes a resin-impregnated wood that is hard to break and has excellent flexibility, and the resin component impregnated into the wood. By forming a network structure by curing, excellent formability can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the wooden molded object which can obtain the molded object which has a desired three-dimensional shape, is excellent in the dimensional stability of wood, and does not generate | occur | produce the resin ooze easily by humidity can be provided. In addition, it is possible to provide a wooden structure material, a vehicle interior material, and an acoustic structure material that have a desired three-dimensional shape, are excellent in dimensional stability of wood, and are less likely to ooze out resin due to humidity.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings shown below are for explaining the configuration of the wood structure material and the like according to the present embodiment, and the size, thickness, dimensions, etc. of each part shown in the figure are the dimensional relationships of the actual wood structure material, etc. May be different.
<First embodiment>
FIG. 1 is a schematic cross-sectional view showing an example of the wooden structure material of this embodiment, and FIG. 2 is a schematic cross-sectional view for explaining an example of a manufacturing method of a wooden molded body for manufacturing the wooden structure material shown in FIG. FIG.

The wood structure material shown in FIG. 1 comprises a molded body 10 manufactured using the method for manufacturing a wooden molded body according to the present invention. As shown in FIG. 1, the molded body 10 has a cross-sectional shape in which opposing end portions 10 a and 10 a are curved in the same direction.
A plate-like wood 1 shown in FIG. 2A is used for the molded body 10. Examples of the material of the wood 1 include spruce, maple and walnut. The thickness of the wood 1 is preferably about 0.1 to 1 mm. It is not preferable that the thickness of the wood 1 is less than 0.1 mm because it may be transparent and the aesthetics may be lowered. Moreover, if the thickness of the wood 1 exceeds 1 mm, the wood 1 may be cracked in the bending process, and a desired three-dimensional shape may not be imparted.

  Moreover, the wood 1 shown in FIG. 2A is used after pretreatment such as bleaching and dyeing as appropriate according to the use. As a pretreatment method for the wood 1, for example, as shown in FIG. 2 (b), the wood 1 can be immersed in a treatment liquid 2 such as a bleach-containing liquid or an aqueous dye. The treatment liquid 2 used here is desirably water-soluble. When the treatment liquid 2 is water-soluble, even when the wood 1 is wet with the treatment liquid 2, a step (impregnation step) of impregnating the wood 1 with the resin aqueous solution 3 described later can be performed. Therefore, when the treatment liquid 2 is water-soluble, a step and time for drying the pretreated wood 1 can be eliminated, and the impregnation step is immediately performed using the pretreated wood 1. Therefore, wood processing can be performed efficiently in a short time.

  For example, as shown in FIG. 2C, the wood 1 that has been subjected to the pretreatment is immersed in the resin aqueous solution 3 to be the resin-impregnated wood 4 impregnated with the resin aqueous solution 3 (impregnation step). . Here, the resin aqueous solution 3 is impregnated between the fibers and the cell walls from the surface of the wood 1, so that the wood 1 swells and becomes a resin-impregnated wood 4 having flexibility suitable for bending.

As a method for impregnating the wood 1 with the aqueous resin solution 3, the wood 1 may be simply immersed in the aqueous resin solution 3, and the pressure in the wood 1 is immersed in the aqueous resin solution 3 to reduce the air in the wood 1. By the method of removing, or before immersing the wood 1 in the resin aqueous solution 3, the air in the wood 1 is removed by a decompression method, and the vacuumed wood 1 is immersed in the resin aqueous solution 3. Further, impregnation of the resin aqueous solution 3 into the wood 1 may be promoted.
The time for impregnating the wood 1 with the resin aqueous solution 3 is, for example, 30 minutes to several days when the wood 1 is simply immersed in the resin aqueous solution 3, and the wood 1 is immersed in the resin aqueous solution 3. When the pressure is reduced, it takes several minutes when the air in the wood 1 is removed by the decompression method before the wood 1 is immersed in the resin aqueous solution 3 for several minutes to several tens of minutes.

The resin aqueous solution 3 used in the impregnation step of the present embodiment is a resin component comprising a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, or a resin component containing a trifunctional or higher aqueous glycidyl ether resin. And a curing agent, a surfactant, and water.
"Trifunctional or higher glycidyl ether resin"
The trifunctional or higher functional glycidyl ether resin used as the resin component of the aqueous resin solution 3 is preferably one having a number average molecular weight of 2500 or less. If the number average molecular weight of the tri- or higher functional glycidyl ether-based resin exceeds 2500, the molecule is too large to enter the cell wall of the wood 1 and the wood 1 cannot be sufficiently swollen, and is suitable for bending processing. There is a possibility that the flexibility cannot be given.

  Specific examples of the tri- or higher functional glycidyl ether resin include glycerin triglycidyl ether, polyglycerin polyglycidyl ether, trimethylpropane triglycidyl ether, EO-modified trimethylpropane triglycidyl ether, PO-modified trimethylpropane triglycidyl ether, and sorbitol. Examples thereof include polyglycidyl ether and pentaerythritol polyglycidyl ether.

Further, when the tri- or higher functional glycidyl ether resin is water-soluble, it can be used alone as the resin component of the resin aqueous solution 3. As the tri- or higher functional aqueous glycidyl ether resin, those having a number average molecular weight of 300 to 2500 are preferably used. If the number average molecular weight of the tri- or higher functional aqueous glycidyl ether-based resin is less than 300, the water-solubility is low, and it may be difficult to uniformly disperse in the aqueous resin solution 3.
In addition, when the number average molecular weight of the tri- or higher functional aqueous glycerin glycidyl ether-based resin exceeds 2200, the molecule is too large to enter the cell wall of the wood 1 and the wood 1 cannot be sufficiently swollen. There is a possibility that flexibility suitable for bending may not be provided. Specific examples of tri- or higher functional aqueous glycidyl ether resins include glycerin triglycidyl ether, polyglycerin polyglycidyl ether, EO-modified (ethylene oxide-modified) trimethylpropane triglycidyl ether, PO-modified (propylene oxide-modified) trimethylpropane tri Examples thereof include glycidyl ether and sorbitol-based polyglycidyl ether.

  Further, when the resin component of the resin aqueous solution 3 is composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, the trifunctional or higher glycidyl ether resin may be water-soluble or not water-soluble. Also good. However, when a water-soluble glycidyl ether-based resin having three or more functions is used, it is more preferable because it can be easily and uniformly dispersed in the aqueous resin solution 3 as compared with a case where a non-water-soluble resin is used. . In addition, even when a water-soluble tri- or higher functional glycidyl ether resin is used, when the viscosity is high, in order to obtain a resin aqueous solution 3 that easily enters the cell wall of the wood 1, 2 It is preferable to use it together with a functional aqueous epoxy resin.

"Bifunctional aqueous epoxy resin"
Examples of the bifunctional aqueous epoxy resin used together with the tri- or higher functional glycidyl ether resin include polyethylene glycol glycidyl ether and glycerin diglycidyl ether, and the number average molecular weight is preferably 300 to 2500. If the number average molecular weight of the bifunctional aqueous epoxy resin is less than 300, the water-solubility is low, and it may be difficult to uniformly disperse in the aqueous resin solution 3 and may be difficult to handle. Moreover, when the number average molecular weight of the bifunctional aqueous epoxy resin exceeds 2500, the molecule is too large to enter the cell wall of the wood 1 and the wood 1 cannot be sufficiently swollen, which is suitable for bending processing. There is a risk that flexibility cannot be imparted.

  When the resin component is composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, the concentration of the trifunctional or higher glycidyl ether resin in the resin component is preferably 1 to 80%. When the concentration of the tri- or higher functional glycidyl ether-based resin is less than 1%, the formation of a network structure (three-dimensional cross-linked structure) formed when the resin component is cured becomes insufficient, and the resin is dissolved in water. There is a possibility that the effect of preventing exudation cannot be obtained sufficiently. In addition, when the concentration of the tri- or higher functional glycidyl ether resin exceeds 80%, the tri- or higher functional glycidyl ether resin in the cell wall of the wood 1 may have a high viscosity or a low water solubility. Since there exists a possibility that it may become the resin aqueous solution 3 which cannot enter easily, it is not preferable. If the tri- or higher functional glycidyl ether-based resin is not uniformly dispersed in the resin aqueous solution 3, the quality of the molded body 10 varies greatly, and the molded body 10 with stable quality cannot be manufactured.

"Curing agent"
The curing agent is not particularly limited as long as it functions as a polymerization catalyst in curing the resin component. For example, imidazole compounds such as 2-methylimidazole, amine compounds such as diethylenetriamine, potassium salts such as potassium acetate, Examples include strongly acidic metal salts such as zinc borofluoride and magnesium borofluoride.

"Surfactant"
The surfactant is not particularly limited as long as it can disperse a tri- or higher functional glycidyl ether resin in the aqueous resin solution 3, but it is a nonionic resin that does not adversely affect the wood 1. It is preferable to use those. In addition, by containing a surfactant in the resin aqueous solution 3, the dispersion of the trifunctional or higher functional glycidyl ether resin in the aqueous resin solution 3 can be promoted. Or when using what is excellent in the dispersibility, it is not necessary to make the resin aqueous solution 3 contain a surfactant.

  Moreover, it is preferable that the density | concentration of the resin component (solid content) in the resin aqueous solution 3 is 5 to 80%, and it is more preferable that it is 10 to 60%. When the concentration of the resin component (solid content) is less than 5%, the effect of improving the moisture resistance, flexibility, and formability obtained by impregnating the wood 1 with the resin aqueous solution 3 and curing the resin component is sufficient. May not be obtained. If the concentration of the resin component exceeds 80%, the water ratio in the resin aqueous solution 3 decreases, so that the swellability of the wood 1 in the impregnation step is reduced, and the resin is not sufficiently impregnated in the wood and bent. There is a possibility that flexibility suitable for processing cannot be provided.

Next, the resin-impregnated wood 4 obtained by the impregnation step is dried. The drying here can be performed by, for example, a method of leaving it in a room temperature atmosphere for several hours and drying it to a semi-dry level.
It is preferable to dry the resin-impregnated wood 4 because the resin aqueous solution 3 can be prevented from dripping from the resin-impregnated wood 4 and contaminating the surroundings, and the resin can be prevented from oozing out during pressing.
In addition, even if the water | moisture content in the resin impregnated wood 4 is discharge | released outside by drying here, the swollen state of the wood 1 is hold | maintained by the resin component taken in between the fibers of the wood 1 or the cell wall in the impregnation process. Is done. For this reason, wrinkles are not formed on the surface of the resin-impregnated wood 4 or the surface of the molded body 10 obtained after the resin component is cured, and the molded body 10 having the original good appearance of the wood 1 can be obtained.

Next, the resin impregnated wood 4 is deformed to give a desired three-dimensional shape by applying a hot press process (bending step), and the resin component impregnated in the resin impregnated wood 4 is cured to impregnate the resin. The shape of the wood 4 is fixed (curing step), and as shown in FIG. 1, the opposite end portions 10a and 10a are formed into a three-dimensional shaped body 10 having a cross-sectional shape curved in the same direction.
At this time, the wood constituting the resin-impregnated wood 4 is in a swollen state in the impregnation step and has flexibility suitable for bending, so that it can be easily formed into a desired shape by hot pressing. Deformed. In addition, the resin-impregnated wood 4 is deformed by hot pressing, and is held and fixed in a swollen state by a crosslinking reaction of resin components impregnated between the fibers of the wood or in the cell walls. A molded body 10 is obtained.

  The hot pressing process is performed, for example, at a pressure of 0.1 to 3 MPa, a temperature of 80 to 150 ° C., and a pressing time of 1 to 10 minutes.

In the above-described embodiment, the curing process is performed while performing the bending process, but the bending process and the curing process may not be performed at the same time, and the curing process may be performed after the bending process is performed. Good.
In the bending process in this case, a method for imparting a three-dimensional shape is not particularly limited as long as the resin-impregnated wood 4 can be deformed into a desired three-dimensional shape, but is preferably performed by press working. Examples of the method for curing the resin component include a method of performing a heat treatment. The heat treatment method may be a method in which the resin-impregnated wood is deformed by press working, and then the press mold is heated while the deformed resin-impregnated wood is placed in the press mold. Alternatively, the resin-impregnated wood deformed from the mold may be taken out and heated.

The molded body 10 of this embodiment is a resin component composed of a tri- or higher functional glycidyl ether-based resin and a bi-functional aqueous epoxy resin as the resin aqueous solution 3 impregnated in the wood 1, or a tri-functional or higher aqueous glycidyl ether-based resin. Since the resin aqueous solution 3 containing the resin component containing the resin is used, and the resin aqueous solution 3 is impregnated into the wood 1 to obtain the resin-impregnated wood 4, and the resin component is cured, for example, the resin component is 2 Compared to the case where it consists only of a functional water-based epoxy resin, it is excellent in dimensional stability, and it is excellent in the moisture resistance which does not cause the resin to exude due to humidity.
This effect is because the resin component is a resin component comprising a trifunctional or higher functional glycidyl ether resin and a bifunctional aqueous epoxy resin, or a resin component containing a trifunctional or higher functional aqueous glycidyl ether resin. It is assumed that a complex network structure (three-dimensional cross-linked structure) is formed by curing, the resin component is entangled with the internal structure of the wood, and the resin component is insolubilized in water. On the other hand, when the resin component is composed only of the bifunctional aqueous epoxy resin, a network structure is not formed even if the resin component is cured, and thus the resin cannot be sufficiently prevented from exuding due to humidity.

Moreover, in the manufacturing method of the wooden molded body of the molded body 10 of the present embodiment, the molded body 10 is fixed by fixing the shape of the resin-impregnated wood 4 by curing the resin component and bending the resin-impregnated wood 4. Therefore, the molded body 10 having a desired three-dimensional shape is obtained.
Moreover, in this embodiment, since the hardening process was performed while performing the bending process, the molded object 10 can be manufactured efficiently in a short time compared with the case where a hardening process is performed after performing a bending process. Moreover, in this embodiment, the bending process and the curing process are performed simultaneously, so that the resin component is cured while the resin-impregnated wood 4 is deformed to form a network structure, and stress is applied by the bending process. Since the resin-impregnated wood 4 being reinforced is reinforced by the network structure, cracking of the resin-impregnated wood 4 generated by the bending process can be effectively prevented.

Furthermore, in this embodiment, since the thickness of the timber 1 is 0.1 to 1 mm, the timber 1 is more unlikely to be cracked in the bending process and can be manufactured with a high yield. Moreover, since the thickness of the timber 1 is 0.1 to 1 mm, the timber 1 is not transparent, and the molded body 10 having the original appearance of the timber 1 can be manufactured.
Moreover, in this embodiment, since the resin aqueous solution 3 containing a resin component and a curing agent was used, the resin aqueous solution 3 containing no curing agent was used, and the resin component was obtained using a curing agent in a later step. Compared with the case of curing, the number of processes is small and the manufacturing process can be simplified.

  Moreover, in this embodiment, when the resin component is composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, the bifunctional aqueous epoxy resin has a number average molecular weight of 300 to 2500, so that the bifunctional The aqueous epoxy resin can be easily and uniformly dispersed in the resin aqueous solution 3, and the resin aqueous solution 3 can easily enter the cell wall of the wood 1. For this reason, the wood 1 can be sufficiently swollen in the impregnation step, and the moisture resistance, flexibility, and formation of the molded body 10 can be effectively improved by curing the resin component.

  Furthermore, when the resin component is composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, the concentration of the trifunctional or higher functional glycidyl ether resin in the resin component is 1 to 80%. A tri- or higher functional glycidyl ether-based resin can be easily and uniformly dispersed in the aqueous resin solution 3, and a good network structure is formed by curing the resin component. The molded body 10 that is less likely to be produced can be manufactured.

  Further, in the above-described embodiment, the case where the molded body 10 having a cross-sectional shape in which the opposite end portions 10a and 10a are curved in the same direction has been described as an example. However, the shape of the molded body 10 is illustrated in FIG. The cross-sectional shape shown in FIG. 1 is not limited, and any three-dimensional shape can be used.

<Second Embodiment>
FIG. 3 is a schematic cross-sectional view showing another example of the wooden structure material of the present embodiment, and FIG. 4 is a view for explaining an example of a method for manufacturing a wooden molded body for manufacturing the wooden structure material shown in FIG. It is a cross-sectional schematic diagram.
The wood structure material shown in FIG. 3 is obtained by being processed using the method for producing a wood molded body of the present invention, and is composed of a molded body 20 that is curved in a substantially arc shape in cross section. Four pieces of the plate-like wood 1 shown in FIG. As wood 1, the thing similar to 1st Embodiment mentioned above is used.

In this embodiment, as shown in FIG. 4 (b), the wood direction shown in FIG. 4 (a) is orthogonal to the wood direction between adjacent woods 1 without pretreatment such as bleaching or dyeing. In the same manner as in the first embodiment described above, the four sheets are laminated together and immersed in the same resin aqueous solution 3 as in the first embodiment to obtain a resin-impregnated wood 4 impregnated with the resin aqueous solution 3 ( Impregnation step). In this embodiment, pretreatment such as bleaching, dyeing, and alkali treatment may be performed.
As shown in FIG. 4 (b), the impregnation step here can be carried out efficiently by laminating four pieces of wood 1 and impregnating the four pieces with the resin aqueous solution 3. Preferably, four pieces of wood 1 may be individually impregnated with the resin aqueous solution 3.

Next, the resin-impregnated wood 4 obtained by the impregnation step is dried in the same manner as in the first embodiment described above.
Next, four resin-impregnated woods 4 are subjected to hot pressing while being placed so that the grain directions of the resin-impregnated woods 4 are adjacent to each other, thereby performing a bending step and a curing step at the same time. Then, the four resin-impregnated woods 4 are brought into close contact with each other to form a molded body 20 having a three-dimensional shape curved in a substantially arc shape in cross section as shown in FIG.

  The hot pressing process is performed, for example, at a pressure of 0.1 to 3 MPa, a temperature of 80 to 150 ° C., and a pressing time of 1 to 10 minutes.

  The molded body 20 of the present embodiment is a resin component composed of a trifunctional or higher functional glycidyl ether resin and a bifunctional aqueous epoxy resin as the resin aqueous solution 3 impregnated in the wood 1, or a trifunctional or higher aqueous glycidyl ether type. Since the resin aqueous solution 3 containing the resin component containing the resin is used and the resin aqueous solution 3 is impregnated into the wood 1 to obtain the resin-impregnated wood 4 and the resin component is cured, the same as in the first embodiment. It has excellent dimensional stability and excellent moisture resistance that prevents the resin from oozing out due to humidity.

  In the present embodiment, the four resin-impregnated woods 4 are arranged and laminated so that the grain directions are perpendicular to each other between the resin-impregnated woods 4 adjacent to each other. Properties such as ease of cracking and dimensional stability can be homogenized. Therefore, the molded body 20 is manufactured using a molded body formed by arranging the four resin-impregnated woods 4 so that the grain directions are all the same, or a single piece of wood having a thickness of four pieces of wood. Compared to a molded body, it is less likely to break and has excellent dimensional stability.

  In the present embodiment, the molded body 20 using four pieces of the wood 1 has been described as an example. However, the number of the woods 1 may not be four, and can be appropriately determined according to the application.

<Third embodiment>
FIG. 5 is a schematic cross-sectional view showing another example of the wooden structure material of the present embodiment, and FIG. 6 is a view for explaining an example of a method for manufacturing a wooden molded body for manufacturing the wooden structure material shown in FIG. It is a cross-sectional schematic diagram.
The wood structure material shown in FIG. 5 is processed by the method for producing a wood molded body of the present invention, and includes a molded body 30 having opposing cross-sectional shapes in which end portions 30a and 30a are curved in the same direction. Is. Two sheet-like woods 1 shown in FIG. 6A are used for the molded body 30, and the built-in backup material 5 is disposed between the two woods 1.

  As wood 1, the thing similar to 1st Embodiment mentioned above is used. In this embodiment, as shown in FIG. 6B, pretreatment such as bleaching and dyeing is performed on the wood 1 in the same manner as in the first embodiment described above. Next, as shown in FIG. 6 (c), the pretreated wood 1 is immersed in the same aqueous resin solution 3 as in the first embodiment, one by one in the same manner as in the first embodiment described above. Resin-impregnated wood 4 impregnated with resin aqueous solution 3 is used (impregnation step).

Next, the resin-impregnated wood 4 obtained by the impregnation step is dried in the same manner as in the first embodiment described above.
Next, as shown in FIG. 6 (d), the adhesive sheet 7, the built-in backup material 5, the adhesive sheet 6, and the other resin-impregnated wood are placed on one of the two resin-impregnated woods 4. A molded body having a cross-sectional shape in which end portions 30a and 30a facing each other are curved in the same direction as shown in FIG. 30. Note that the two resin-impregnated woods 4 are arranged such that the grain directions are the same.

The built-in backup material 5 used here may be anything as long as it can reinforce the molded body, and is not particularly limited. For example, a non-woven fabric, a woven fabric, a resin made of an aluminum plate sheet, polyester, or the like. Examples include impregnated glass fibers and wood laminates.
Examples of the adhesive sheet 6 include a paper impregnated with a phenol adhesive and a paper impregnated with a melamine adhesive.

  The hot pressing process is performed, for example, at a pressure of 0.1 to 3 MPa, a temperature of 80 to 150 ° C., and a pressing time of 1 to 10 minutes.

  The molded body 30 of the present embodiment is a resin component composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin as the aqueous resin solution 3 impregnated in the wood 1, or a trifunctional or higher aqueous glycidyl ether system. Since the resin aqueous solution 3 containing the resin component containing the resin is used and the resin aqueous solution 3 is impregnated into the wood 1 to obtain the resin-impregnated wood 4 and the resin component is cured, the same as in the first embodiment. It has excellent dimensional stability and excellent moisture resistance that prevents the resin from oozing out due to humidity.

  Moreover, in this embodiment, since the molded body 30 is reinforced by disposing the built-in backup material 5 between the two resin-impregnated woods 4 before the curing step, the molded body 30 having excellent strength and rigidity. Is obtained.

  In the present embodiment, the adhesive sheets 6 and 7 are disposed between the resin-impregnated wood 4 and the built-in backup material 5, but instead of the adhesive sheets 6 and 7, an adhesive such as urethane, epoxy, or silicon is used. In the case of using a material that can sufficiently obtain adhesion with the resin-impregnated wood 4 by a bending process and / or a curing process, the adhesive sheet 6 may be applied. 7 or an adhesive may not be disposed.

Further, in the present embodiment, the molded body 30 using two pieces of wood 1 and one piece of built-in backup material 5 has been described as an example, but the number of wood 1 and the number of built-in backup materials 5 may be used for each purpose. It can be determined appropriately according to
In the present embodiment, the two resin-impregnated woods 4 are arranged so that the grain directions are the same, but the two resin-impregnated woods 4 are arranged so that the grain directions are orthogonal to each other depending on the application. May be.

<Fourth embodiment>
FIG. 7 is a view for explaining an example of the vehicle interior material according to the present embodiment, FIG. 7 (a) is a schematic cross-sectional view of the vehicle interior material, and FIG. 7 (b) is FIG. 7 (a). It is a cross-sectional schematic diagram for demonstrating an example of the manufacturing method of the vehicle interior material shown.
The vehicle interior material 40 shown in FIG. 7A is a surface in the curved direction (downward in FIG. 7A) of the opposite end portions 30a and 30a of the outer surface of the molded body 30 shown in FIG. In addition, an external backup material 51 is formed.
The external backup material 51 is made of resin, and is formed by, for example, an injection molding method using the mold 8 shown in FIG. In the mold 8 shown in FIG. 7B, the upper mold 8a and the lower mold 8b are integrated to form a cavity 8c having a shape corresponding to the outer diameter of the vehicle interior material 40. An injection path 8d for injecting molten resin into the cavity 8c is provided.

  The molten resin may be any resin that can be injection-molded. For example, olefin resin, acrylic resin, styrene resin, ABS resin, polyamide resin (nylon), polycarbonate resin, polysilica It is preferable to use a styrene resin or the like, and a glass fiber reinforced resin obtained by mixing and reinforcing a glass fiber or the like with these resins may be used.

  In order to form the external backup material 51 using the mold 8, as shown in FIG. 7 (b), the molded body 30 shown in FIG. 6 is arranged in the cavity 8c of the mold 8, and the injection path 8d is used. It is obtained by injecting molten resin and solidifying the resin in the cavity 8c.

  In the present embodiment, the external backup material 51 is formed by injection molding. However, the external backup material 51 may be made of a foamed resin formed by a foam formation method.

  Since the vehicle interior material 40 of the present embodiment uses the molded body 30 (woody structural material) processed by the method for manufacturing a wooden molded body of the present invention, the vehicle interior material 40 is excellent in dimensional stability and is free of resin due to humidity. It is excellent in moisture resistance, which prevents exudation.

  Moreover, in this embodiment, since the molded object 30 is reinforced by forming the external backup material 51 in the outer surface of the molded object 30, the vehicle interior material 40 excellent in intensity | strength and rigidity is obtained.

<Fifth embodiment>
FIG. 8 is a schematic cross-sectional view for explaining another example of the manufacturing method of the wooden molded body for manufacturing the wooden structure material shown in FIG. Since this embodiment is different from the third embodiment only in the manufacturing method, only the difference from the third embodiment will be described, and the other description will be omitted.

  As the wood 1, as shown in FIG. 8A, the same material as that of the first embodiment described above is used. Then, as shown in FIG. 8B, the wood 1 is subjected to pretreatment such as bleaching and dyeing in the same manner as in the first embodiment described above. Next, in the present embodiment, as shown in FIG. 8C, the wood 1 that has been pretreated is immersed one by one in the resin aqueous solution 31, and the resin-impregnated wood 4 impregnated with the resin aqueous solution 31, respectively. (Impregnation step).

The resin aqueous solution 31 used in the present embodiment includes the same resin component as the first embodiment described above, a surfactant, and water, and does not include a curing agent unlike the first embodiment described above. Is.
Next, the resin-impregnated wood 4 obtained by the impregnation step is dried in the same manner as in the first embodiment described above.

Next, the resin impregnated wood 4 is soaked with a curing solution containing a curing agent. Examples of the curing solution used here include those obtained by diluting the same curing agent as that in the first embodiment with a solvent. The solvent used here is not particularly limited as long as it can uniformly disperse the curing agent and does not inhibit the curing reaction of the resin component. For example, water, methanol, ethanol, acetone, toluene Etc. can be exemplified.
In addition, the density | concentration of the hardening | curing agent in a hardening solution should just be able to harden a resin component, can be determined according to the usage-amount of hardening solution, etc., and is not specifically limited.

  Specifically, a 1% ethanol solution of epoxy 2-methylimidazole or a 1% ethanol solution of 2,2′azobis (2-methyl-N (hydroxyethyl) propionamide) is preferably used as the curing solution. .

Examples of the method of soaking the curable solution include a method of applying the curable solution and a method of impregnating it. Examples of the method for applying the curable solution include brush coating and spray coating. Further, examples of the impregnation method of the curing solution include a method of immersing the resin-impregnated wood 4 in the curing solution, a vacuum impregnation method, and the like.
When the resin-impregnated wood 4 is impregnated with the hardening solution, if the resin-impregnated wood 4 is impregnated with the resin-impregnated wood 4 when the resin-impregnated wood 4 is immersed or vacuum impregnated for a long time, There is a risk of elution. For this reason, it is not preferable to immerse or vacuum impregnate the resin-impregnated wood 4 in the hardening solution for a long time. .

  Next, as shown in FIG. 8 (d), on one resin-impregnated wood 4 of the two resin-impregnated woods 4, the adhesive sheet 7, the built-in backup material 5, The adhesive sheet 6 and the other resin-impregnated wood are laminated in this order and subjected to hot pressing to perform a bending process and at the same time a curing process, resulting in a molded body 30 shown in FIG.

  In the molded body 30 of the present embodiment, a resin aqueous solution 31 containing a resin component composed of a bifunctional aqueous acrylic resin and a trifunctional or higher acrylic resin is used as the resin aqueous solution 31 impregnated in the wood 1. 1 is impregnated into a resin-impregnated wood 4 and is obtained by applying and / or impregnating a hardening solution to the resin-impregnated wood 4 and curing the resin component. It is excellent in stability and has excellent moisture resistance that prevents the resin from exuding due to humidity.

  And in the manufacturing method of the molded object 30 of this embodiment, what does not contain a hardening | curing agent is used as the resin aqueous solution 31, and the hardening solution is apply | coated and / or impregnated to the resin-impregnated wood 4. FIG. For this reason, the curing solution can be applied and / or impregnated on the resin-impregnated wood 4 immediately before the curing step. Therefore, even if it takes a long time to perform the curing step after the resin aqueous solution 31 is impregnated into the wood 1 to form the resin-impregnated wood 4, the resin component is cured before the curing step, and the desired shape is obtained. It cannot be formed.

  Furthermore, in the manufacturing method of the molded body 30 of the present embodiment, the resin-impregnated wood 4 is applied and / or impregnated with the resin-impregnated wood 4 before the bending step, so that the molded body 30 having a desired shape can be obtained with high accuracy. Can do. On the other hand, for example, when the resin-impregnated wood 4 is coated and / or impregnated with the resin-impregnated wood 4 after the bending process, the shape obtained by deformation by the bending process causes the resin-impregnated wood 4 to be soaked with the cured solution. May deform, and the accuracy of the shape of the molded body 30 may be insufficient.

<Sixth embodiment>
This embodiment demonstrates the other example of the manufacturing method of the wooden molded object for manufacturing the vehicle interior material 40 shown in FIG. Since this embodiment is different from the third embodiment and the fourth embodiment only in the manufacturing method, only the difference from the third embodiment and the fourth embodiment will be described, and the other description will be omitted.

  In the present embodiment, the external backup material 51 is made of resin, and is formed in advance by, for example, an injection molding method using a mold, separately from the molded body 30. And in this embodiment, as shown in FIG.6 (d), the adhesive sheet 7 is built-in on one resin impregnated wood 4 of the two resin impregnated woods 4 similarly to 3rd Embodiment mentioned above. Resin in contact with the external backup material 51 while deforming the laminate of the backup material 5, the adhesive sheet 6 and the other resin-impregnated wood in this order along the shape of the external backup material 51 using press working or ironing The outer surface of the impregnated wood 4 and the external backup material 51 are bonded (bending process), and at the same time, a curing process is performed to obtain the vehicle interior material 40.

  For adhesion between the outer surface of the resin-impregnated wood 4 and the external backup material 51, an adhesive sheet such as urethane-based, epoxy-based, silicon-based adhesive, phenol adhesive-impregnated paper, melamine adhesive-impregnated paper, etc. Can be used.

In the present embodiment, similarly to the above-described embodiment, the bending process and the curing process may not be performed simultaneously, and the curing process may be performed after the bending process is performed.
In this embodiment, the external backup material 51 is formed by injection molding. However, the external backup material 51 may be made of a foamed resin formed by a foam formation method, or aluminum or magnesium. It may be a metal material such as wood material such as wood or plywood.

Also in the manufacturing method of the vehicle interior material 40 of the present embodiment, a product excellent in dimensional stability and excellent in moisture resistance in which the resin does not bleed out due to humidity can be obtained.
Also in the present embodiment, since the molded body 30 is reinforced by forming the external backup material 51 on the outer surface of the molded body 30, the vehicle interior material 40 is excellent in strength and rigidity.

<Seventh embodiment>
This embodiment demonstrates the other example of the manufacturing method of the wooden molded object for manufacturing the vehicle interior material 40 shown in FIG. Since this embodiment is different from the third embodiment and the fourth embodiment only in the manufacturing method, only the difference from the third embodiment and the fourth embodiment will be described, and the other description will be omitted.

  In the present embodiment, the external backup material 51 is made of resin, and is formed separately from the molded body 30 by, for example, an injection molding method using a mold. In the present embodiment, as in the third embodiment described above, the molded body 30 shown in FIG. 5 is manufactured, and the outer surface of the molded body 30 in contact with the external backup material 51 and the external backup material 51 are bonded. The vehicle interior material 40 is used.

  For adhesion between the outer surface of the molded body 30 and the external backup material 51, an adhesive such as urethane, epoxy, or silicon can be used.

  Also in this embodiment, the external backup material 51 may be made of a foamed resin formed by a foam formation method. Further, as the external backup material 51, a metal material such as aluminum or magnesium, or a wood material such as wood or plywood may be used.

Also in the manufacturing method of the vehicle interior material 40 of the present embodiment, a product excellent in dimensional stability and excellent in moisture resistance in which the resin does not bleed out due to humidity can be obtained.
Also in the present embodiment, since the molded body 30 is reinforced by forming the external backup material 51 on the outer surface of the molded body 30, the vehicle interior material 40 is excellent in strength and rigidity.

  In addition, since the molded object of this invention and a wooden structure material are excellent in moisture resistance, it can be used for various uses, even if it does not give coating. However, the surface of the molded body and the wooden structure material processed by the manufacturing method of the wooden molded body of the present invention may be coated. Moisture resistance can be further improved by using such a molded body and wood structure material. In addition, since the wood structure material of the present invention is excellent in moisture resistance, it is possible to prevent a decrease in the smoothness of the painted surface due to humidity when the surface is coated, and to maintain the aesthetics of the painted surface over a long period of time. it can.

  In addition to the vehicle interior materials described above, the molded body and wood structure material processed according to the present invention can be used, for example, in interiors and exterior materials as building materials, indoors with high humidity such as baths, and outdoors. It can be suitably used as an acoustic structural material such as a diaphragm, an acoustic musical instrument such as a woodwind instrument, a stringed instrument, and a percussion instrument, and a musical instrument structure such as an inner / exterior body of an electric / electronic musical instrument.

“Experimental Example 1 to Experimental Example 13”
A resin aqueous solution containing the materials shown in Table 1 is impregnated into a plate-like wood having the materials and thickness dimensions shown in Table 1 under the conditions shown below to form a resin-impregnated wood (impregnation step), and left in a room temperature atmosphere for 4 hours. After drying, hot pressing was performed under the conditions shown below, and a curing process was performed to obtain plate-like test examples of Experimental Examples 1 to 13.

In Table 1, symbols 0P, 2P (1), 2P (2), 2P (3), 2P (4), 3P, H (1), and H (2) indicate the materials shown below. In the following, “PEG” means polyethylene glycol.
0P: PEG # 600
2P (1): PEG (# 400) diglycidyl ether (trade name: Denacol EX-830, manufactured by Nagase ChemteX Corporation)
2P (2): PEG (# 200) diglycidyl ether (trade name: Denacol EX-821, manufactured by Nagase ChemteX Corporation)
2P (3): PEG (# 1000) diglycidyl ether (trade name: Denacol EX-861, manufactured by Nagase ChemteX Corporation)
2P (4): PEG (# 2000) diglycidyl ether 3P: polyglycerin polyglycidyl ether (Denacol EX-512 (trade name) manufactured by Nagase ChemteX Corporation) Molecular weight 538

H (1): 2-methylimidazole H (2): 45% aqueous solution of zinc borofluoride

  In Table 1, the amount of the resin indicates the concentration of the resin in the resin component, the amount of the curing agent indicates the amount of the curing agent relative to the amount of the resin component, and the amount of the surfactant indicates the surface activity with respect to the aqueous resin solution. Indicates the amount of agent.

In addition, as a timber, the thing of the dimension of a fiber direction (grain direction) is 80 mm, and the dimension of a direction (direction orthogonal to a grain direction) orthogonal to a fiber direction was used.
"Impregnation conditions"
It was immersed for 30 minutes in a resin aqueous solution having a resin component (solid content) concentration of 30%.
"Hot press processing conditions"
Temperature: 150 ° C., time: 6 minutes, pressure 1 Mpa

"Experimental example 14"
A plate-like wood having the material and thickness shown in Table 1 that was not impregnated with the aqueous resin solution was used as a test body of Experimental Example 14.
In Table 1, Experimental Examples 1 to 11 are examples of the present invention, and Experimental Examples 12 to 14 are comparative examples.

The dimensional change rate and the resin outflow amount of the test bodies of Experimental Examples 1 to 14 obtained as described above were examined as follows. The results are shown in Table 1.
Dimensional change rate
First, the specimens of Experimental Examples 1 to 14 were heat-treated at a temperature of 105 ° C. for 6 hours or more, and then the dimension (R1) in the direction orthogonal to the fiber direction was measured. Then, it was left for 24 hours in an environment of a temperature of 30 ° C. and a humidity of 85%, and the dimension in the direction perpendicular to the fiber direction was measured (R2). Using the dimensions (R1) and (R2) in the fiber direction thus obtained, the dimensional change rate was obtained by the following equation.
Dimensional change rate (%) = {(R2-R1) / R1} × 100

"Resin spillage"
The resin outflow was determined by the following equation.
Resin outflow rate (%) = {(W1-W2) / (W1-W0)} × 100
In the above formula, W0 represents the weight measured after heat-treating the wood before impregnating the resin aqueous solution at a temperature of 105 ° C. for 6 hours or more, and W1 represents the specimen obtained after the curing step at a temperature of 105 The weight measured after heat treatment at 6 ° C. for 6 hours or more is shown. W2 is a test specimen immersed in water for 24 hours, then dried in an environment of a temperature of 22 ° C. and a humidity of 60% for 6 hours. The weight measured after heat treatment at 6 ° C. for 6 hours or more is shown.

As shown in Table 1, an experimental example in which an aqueous resin solution includes a resin component composed of a trifunctional or higher glycidyl ether resin and a bifunctional aqueous epoxy resin, or a resin component including a trifunctional or higher aqueous glycidyl ether resin. In all of Examples 1 to 11, the dimensional change rate was 3.7% or less, which was very low as compared with the dimensional change rate of 6.5% in Experimental Example 14 in which the resin aqueous solution was not impregnated.
Moreover, in Experimental Examples 1 to 11, the resin outflow amount is 20% or less, the aqueous resin solution is Experimental Example 12 in which the resin component is only a bifunctional aqueous epoxy resin, and the resin component is a resin having no functional group. Compared with Experimental Example 13 consisting of

"Experimental Example 15"
A molded body was manufactured by the method for manufacturing a wooden molded body of the present invention, and a vehicle interior material shown in FIG. 9 was manufactured using a wooden structural material made of the molded body. FIG. 9 is a view showing an example of a vehicle interior material according to the present invention, FIG. 9 (a) is a plan view, and FIG. 9 (b) is a schematic sectional view.
The vehicle interior material 60 shown in FIG. 9 was manufactured as follows.

  First, the same resin aqueous solution as in Experimental Example 2 is impregnated into the following two plate-like woods 1a and 1b under the following conditions to obtain a resin-impregnated wood (impregnation step). Dried. Next, the adhesive sheet, the built-in backup material 5, the adhesive sheet, and the other resin-impregnated wood are laminated in this order on one of the two resin-impregnated woods, and under the same conditions as in Experimental Example 1. A bending process is performed simultaneously with the hot pressing process, and a curing process is performed. Both the short sides 50a have a curvature of 1. in the wood 1a side (the lower side in FIG. 9A) whose short side direction is the grain direction. A molded body 50 shown in FIG. 9 curved at 5R was obtained. The two resin-impregnated woods (woods 1a and 1b) were arranged so that the grain directions were the same. Next, the external backup material 51 is injection-formed on the surface (the lower surface in FIG. 9A) 50b in the curved direction of the opposed short sides 50a and 50a of the outer surface of the molded body 50 shown in FIG. It is formed by the method, and has the shape shown in FIG. 9 having a length of 220 mm in the long side direction, a size of 80 mm in the short side direction, and a thickness of 15 mm, and the surface opposite to the external backup material 51 (the upper surface in FIG. 9A). ) 50c was coated with polyester and colored to obtain a vehicle interior material 60 of Experimental Example 15.

In addition, as the wood 1, two pieces having a thickness of 0.2 mm and a material made of maple and perpendicular to the grain direction were used.
As the adhesive sheet, phenol resin-impregnated paper having a thickness of 0.1 mm was used.
As a built-in backup material, an aluminum plate having a thickness of 0.1 mm was used.
As an external backup material, ABS resin containing 20% glass fiber was used.
"Impregnation conditions"
It was immersed for 30 minutes in a resin aqueous solution having a resin component (solid content) concentration of 30%.

The appearance of the vehicle interior material 60 of Experimental Example 15 obtained in this manner was visually observed. As a result, cracks in the wood were not generated, and it was confirmed that the above processing method was a processing method with excellent formability.
Further, the vehicle interior material 60 of Experimental Example 15 and the wood coated with the same resin solution as that of Experimental Example 15 before being impregnated with the aqueous resin solution are left in an environment of a temperature of 50 ° C. and a humidity of 95% for 300 hours. Then, a moisture resistance test was performed to visually observe the influence of the humidity on the painted surface. As a result, the coated surface of the vehicle interior material 60 of Experimental Example 15 has less deterioration in the smoothness of the painted surface due to humidity and better moisture resistance than the painted surface of wood before impregnation with the aqueous resin solution. It was confirmed that there was.

"Experimental example 16"
The diaphragm shown in FIG. 10 was manufactured using the wooden structure material which consists of the molded object processed with the manufacturing method of the wooden molded object of this invention. FIG. 10 is a diagram for explaining a diaphragm which is an example of the acoustic structural material of the present invention, and FIG. 10 (a) is a plan view for explaining one process of manufacturing the diaphragm. (B) is a cross-sectional schematic diagram of a diaphragm.
The diaphragm 70 shown in FIG. 10 was manufactured as follows.

  First, the same resin aqueous solution as in Experimental Example 6 was impregnated into the following two plate-like woods 11a and 11b under the conditions shown below to obtain a resin-impregnated wood (impregnation step). Dried. Next, as shown in FIG. 10 (a), two resin-impregnated timbers (woods 11a and 11b) are overlapped so that the grain directions are orthogonal to each other, and extend from the periphery of the overlapped part in the direction of grain extension. Lamination was performed so that the protruding portion 11c made of one piece of wood was formed. The obtained laminate is subjected to hot pressing under the conditions shown below, so that it is performed simultaneously with the bending process and the curing process, and has a flat, substantially circular bottom 70a at the center, from the bottom 70a to the edge 70b. A diaphragm 70 shown in FIG. 10 (b) having a cone shape of a speaker provided with a concave portion 70c having a cross-sectional shape curved toward the top is obtained.

  Thereafter, a voice coil (not shown) or the like was attached to the diaphragm 70 shown in FIG. 10B to obtain a speaker.

As the wood 1, two pieces having a thickness of 0.2 mm and a material made of spruce were used.
"Impregnation conditions"
It was immersed for 30 minutes in a resin aqueous solution having a resin component (solid content) concentration of 60%.
"Hot press processing conditions"
Temperature: 150 ° C., time: 10 minutes, pressure 0.5 Mpa

  The speaker thus obtained had a good woody appearance. Moreover, it turned out that it is excellent in sustained shape stability. Also, the tone was good.

FIG. 1 is a schematic cross-sectional view showing an example of a wood structure material according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view for explaining an example of a method for producing a wood molded body for producing the wood structure material shown in FIG. FIG. 3 is a schematic cross-sectional view showing another example of a wooden structure material according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view for explaining an example of a method for producing a wood molded body for producing the wood structure material shown in FIG. FIG. 5 is a schematic cross-sectional view showing another example of a wooden structure material according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view for explaining an example of a method for producing a wood molded body for producing the wood structure material shown in FIG. FIG. 7 is a view for explaining an example of a vehicle interior material according to an embodiment of the present invention. FIG. 7A is a schematic cross-sectional view of the vehicle interior material, and FIG. It is a cross-sectional schematic diagram for demonstrating an example of the manufacturing method of the vehicle interior material shown to (a). FIG. 8 is a schematic cross-sectional view for explaining another example of the manufacturing method of the wooden molded body for manufacturing the wooden structure material shown in FIG. FIG. 9 is a view showing an example of a vehicle interior material according to the present invention, FIG. 9 (a) is a plan view, and FIG. 9 (b) is a schematic sectional view. FIG. 10 is a diagram for explaining a diaphragm which is an example of the acoustic structural material of the present invention, and FIG. 10 (a) is a plan view for explaining one process of manufacturing the diaphragm. (B) is a cross-sectional schematic diagram of a diaphragm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 11a, 11b ... Wood, 2 ... Treatment liquid, 3 ... Resin aqueous solution, 4 ... Resin impregnated wood, 5 ... Built-in backup material, 6, 7 ... Adhesive sheet, 8 ... Mold, 8a ... Upper die 8b ... Lower mold, 8c ... Cavity, 8d ... Injection path, 10, 20, 30, 50 ... Molded body, 10a, 30a ... End, 40, 60 ... Vehicle interior material, 50a ... Short side, 51 ... Outside Backup material with 70, diaphragm, 70a ... bottom, 70b ... edge, 70c ... recess.

Claims (14)

An impregnation step of impregnating a plate-like wood with a resin aqueous solution containing a resin component composed of a tri- or higher functional glycidyl ether resin and a bifunctional aqueous epoxy resin;
Bending process for deforming the wood after impregnating the aqueous resin solution;
A method for producing a woody molded body, comprising: a curing step in which the resin component is cured to form a molded body simultaneously with or after the bending step. An impregnation step of impregnating a plate-shaped wood with an aqueous resin solution containing a resin component containing an aqueous glycidyl ether resin having a functionality of 3 or more;
Bending process for deforming the wood after impregnating the aqueous resin solution;
A method for producing a woody molded body, comprising: a curing step in which the resin component is cured to form a molded body simultaneously with or after the bending step.   The said resin aqueous solution contains a hardening | curing agent, The manufacturing method of the wooden molded object of Claim 1 or Claim 2 characterized by the above-mentioned.   3. The method for producing a woody molded article according to claim 1, wherein before the curing step, the wood after impregnated with the aqueous resin solution is impregnated with a curing solution containing the curing agent.   In the bending step, the plurality of pieces of wood that have been impregnated with the aqueous resin solution are stacked and deformed, and in the curing step, the pieces of wood are brought into close contact with each other. Item 5. A method for producing a woody molded article according to any one of Items 4 to 5.   The method for producing a woody molded body according to any one of claims 1 to 5, wherein the thickness of the wood is 0.1 to 1 mm.   The number average molecular weight of the said bifunctional water-based epoxy resin is 300-2500, The manufacturing method of the woody molded object in any one of Claim 1, Claim 3-Claim 6 characterized by the above-mentioned.   6. The method for producing a woody molded body according to claim 5, wherein in the bending step, a built-in backup material is disposed between the plurality of timbers.   In the bending process, the outer surface of the wood after impregnating the resin aqueous solution and the external backup material are deformed along the shape of the external backup material while the wood after impregnating the resin aqueous solution is deformed. It adhere | attaches, The manufacturing method of the wooden molded object in any one of Claims 1-8 characterized by the above-mentioned.   The method for producing a woody molded body according to any one of claims 1 to 9, further comprising a step of injection-molding an external backup material on an outer surface of the molded body after the curing step.   The method for producing a woody molded body according to any one of claims 1 to 10, further comprising a step of bonding an external backup material to an outer surface of the molded body after the curing step.   A wood structure material comprising a molded body manufactured by the method for manufacturing a wooden molded body according to any one of claims 1 to 11.   An interior material for a vehicle comprising the wooden structure material according to claim 12. An acoustic structural material comprising the wooden structural material according to claim 12.

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