JP5844080B2 - Manufacturing method of wood products - Google Patents

Description

  The present invention relates to a method for manufacturing a wooden product.

When manufacturing wood materials such as plywood, particle board (PB), MDF, etc., and using these as a base material and joining a single plate to the base material to manufacture a decorative board, etc., a hot press such as a steam press is used. Hot pressing is widely used.
In the production of wooden materials by hot pressing, the hot pressing time is a factor that greatly affects productivity. Therefore, various techniques for shortening the hot pressing time have been proposed.
For example, Patent Document 1 proposes a method of adding MDI (di-phenylmethane, di-isocyanate) as a curing accelerator to an adhesive used in the manufacture of particle board, and Patent Document 2 discloses a method of hot pressing. Previously, a method has been proposed in which the adherend is preheated by high frequency.
Patent Document 3 proposes a method of applying a vibration of 5 to 2000 Hz under pressure after application of an adhesive.

However, as in Patent Document 1, when a secondary material is blended as a curing accelerator, viscosity increase and curing are promoted, and the time available for use as an adhesive is shortened. There are inconveniences such as requiring a large-scale device.
Moreover, when using an external device like patent document 2 and 3, there existed a problem that a large-scale capital investment was needed for a manufacturing line.

By the way, the technique of mix | blending a carbon nanotube with an adhesive agent is known. For example, Patent Document 4 describes a technique for improving the rigidity of a conductive adhesive by blending carbon nanotubes into an adhesive instead of metal particles, and Patent Document 5 describes a table tennis by attaching rubber. It is described that carbon nanotubes are used as an adhesive for bonding constituent members of table tennis racket blades, which are used as rackets.
However, these compounds are compounded by paying attention to the electric conductivity and the resilience improving ability of carbon nanotubes.

Japanese Patent Laid-Open No. 11-254411 JP 2006-289759 A JP 2008-044330 A JP 2004-27134 A JP 2005-006924 A

Accordingly, an object of the present invention is to provide a manufacturing how wood products which can be produced efficiently wood products by shortening the hot press time.

The present invention relates to a method for producing a wood product in which a production intermediate containing an adhesive is heat-pressed to obtain a wood product. As the adhesive, a fine carbon fiber having an outer diameter of 200 nm or less is blended in an aqueous adhesive and dispersed. There use an adhesive after the dispersion treatment in the machine, the wood product, plywood, laminated veneer, particle board, fiber board, OSB, on one side or both sides of the laminated wood or made of block board substrate, by providing a method for producing a wood based product, characterized in wood composite der Rukoto obtained by bonding a surface decorative material via the adhesive is obtained by achieving the above object.

According to the manufacturing how wood products of the present invention can be produced efficiently wood products by shortening the hot press time.

Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
The wood products manufactured by the present invention include: (1) a wood material that is a plywood or a single plate laminated material in which the single plates are bonded via an adhesive, or elements such as small pieces of wood or fibers that have adhesives. Wood materials such as a wood board integrated through a wood board, and (2) a wood composite material in which a surface decorative material is joined to one or both sides of a base material made of wood material via an adhesive.

(1) Wood material (1) Wood materials such as plywood, single plate laminate (LVL), particle board (PB), fiber board (MDF, etc.), OSB (Oriented Strand Board), laminated wood, block board, etc. Is mentioned.

The plywood is a wood board in which a plurality of single plates obtained by thinly slicing wood are laminated by heat and pressure so that the fiber directions are staggered, and the layers are bonded via an adhesive. The plywood may be such that there is a two-layer or three-layer veneer in which the fiber orientation direction is aligned in part of the thickness direction.
Veneer laminate (LVL) is a wood board in which a single board obtained by thinly slicing wood is laminated by hot-pressure bonding with multiple fibers facing in the same direction, and the layers are joined via an adhesive. ing.
When manufacturing a plywood and a single board laminated material as a wood material, the adhesive agent of a fine carbon fiber is used as an adhesive agent used for adhesion | attachment of all the interlayers or one part interlayer.

Particle boards are wood boards that are obtained by heat-pressing small pieces (elements) obtained by cutting or crushing wood together with adhesives into mats (production intermediates). An adhesive is used as a binder for binding the.
The fiber board is a wood board that is obtained by heat-pressing a mat-like product (manufacturing intermediate) obtained by mixing wood fibers (elements) obtained by evaporating and defibrating wood with an adhesive. An adhesive is used as a binder for bonding the elements together. Examples of the fiber board include MDF (medium specific gravity fiber board), hard board (HB), and insulation board, but the present invention is suitable for manufacturing dry-formed particle boards and MDFs. The production intermediate is preferably obtained by dry forming.
OSB (Oriented Strand Board) is an element obtained by orienting, laminating, and adhering thin pieces of raw material elements. The element has a larger area and thinner shape than that used for particleboard, leaving more wood anisotropy.
When producing particle boards, fiber boards and OSBs as wood products, an adhesive containing fine carbon fibers is used as an adhesive for bonding elements together.

The laminated material is obtained by gluing and bonding saw plates or small-angled materials in the length, width, and thickness directions with the fiber directions parallel to each other. A production intermediate is obtained by arranging a sheet or a small square material in a predetermined shape with an adhesive interposed therebetween.
The block board is obtained by collecting and bonding block-shaped pieces in a plate shape.
When manufacturing a laminated material and a block board as a wood material, the adhesive agent of a fine carbon fiber is used as an adhesive agent which joins a board, a small square material, or block-shaped small pieces.

(2) Wood composite material (2) Wood composite material is made of wood material such as plywood, veneer laminate, particle board, fiber board, OSB, laminated wood, block board, etc. Or what formed by bonding surface decorative materials, such as a veneer, to both surfaces via the adhesive agent is mentioned. A production intermediate including an adhesive is obtained by superposing a surface decorative material on one or both sides of a base material with an adhesive interposed therebetween.
The wood material used as the base material may be a conventional material manufactured using an adhesive not containing fine carbon fibers, or a wood material manufactured using an adhesive containing fine carbon fibers. Also good. Examples of the surface decorative material to be laminated and bonded to the substrate include a veneer, paper, a synthetic resin sheet such as an olefin resin sheet and a vinyl chloride sheet, and melamine impregnated paper. The veneer may be a veneer obtained from a plantation tree in addition to a veneer obtained from a natural wood.
Examples of the shape of the substrate include various shapes such as a film, a sheet, a plate, and a three-dimensional molded product.

  In addition, for the base material, for example, an ultraviolet absorber, an antioxidant, a release agent, an antistatic agent, a colorant, a flame retardant, a fiber reinforcing agent such as glass fiber, an inorganic filler, etc. Or what was made to contain 2 or more types can be used.

Next, the adhesive used in the present invention will be described.
The adhesive used in the present invention is preferably a fine carbon fiber-containing aqueous adhesive.
The fine carbon fiber preferably has an outer diameter of 200 nm or less, more preferably 0.5 to 150 nm.

  The fine carbon fibers used in the present invention are single-layer, double-layer, and multilayer fine carbon fibers, and can be used according to the purpose. In many applications, more preferably, multi-layered fine carbon fibers are used. The method for producing the fine carbon fiber is not particularly limited, but any of the conventionally known production methods such as a vapor phase growth method using a catalyst, an arc discharge method, a laser evaporation method and a HiPco method (High-pressure carbon monoxide process) can be used. Can be used.

  For example, a method for producing a single-layer fine carbon fiber by laser vapor deposition is shown below. Prepare graphite powder and nickel and cobalt fine powder mixed lot as raw materials. This mixed lot was heated at 1250 ° C. in an electric furnace under an argon atmosphere of 665 hPa (500 Torr), and irradiated with a second harmonic pulse of 350 mJ / Pulse Nd: YAG laser to evaporate carbon and metal fine particles. A single-layer fine carbon fiber can be produced.

  The above manufacturing method is merely a typical example, and the metal type, gas type, electric furnace temperature, laser wavelength, and the like may be changed. In addition, other than laser deposition methods, for example, HiPco method, vapor phase growth method, arc discharge method, carbon monoxide thermal decomposition method, template method in which organic molecules are inserted into fine pores, thermal decomposition, fullerene -You may prepare a single layer fine carbon fiber by other methods, such as a metal co-evaporation method.

For example, a method for producing a two-layer fine carbon fiber by a constant temperature arc discharge method is shown below.
The substrate was a surface-treated Si substrate, and the treatment method was a solution obtained by immersing alumina powder in a solution in which the catalyst metal and the catalyst auxiliary metal were dissolved for 30 minutes and then dispersing by ultrasonic treatment for 3 hours. Is applied to a Si substrate and dried in air at 120 ° C. for 2 hours. A substrate is installed in the reaction chamber of the fine carbon fiber production apparatus, a mixed gas of hydrogen and methane is used as a reaction gas, the supply amount of gas is 500 sccm for hydrogen, 10 sccm for methane, and the pressure in the reaction chamber is 70 Torr. The cathode part uses a rod-like discharge part made of Ta. Next, a DC voltage is applied between the anode part and the cathode part, and between the anode part and the substrate, and the discharge voltage is controlled so that the discharge current becomes constant at 2.5A. When the temperature of the cathode portion is 2300 ° C. due to discharge, the normal glow discharge state is changed to an abnormal glow discharge state, and the discharge current is 2.5 A, the discharge voltage is 700 V, and the reaction gas temperature is 3000 ° C. for 10 minutes. Single-layer and double-layer fine carbon fibers can be produced over the entire substrate.

  The above manufacturing method is merely an example, and various conditions such as the type of metal and the type of gas may be changed. Further, a two-layer fine carbon fiber may be prepared by a production method other than the arc discharge method.

For example, a method for producing a multi-layered fine carbon fiber having a three-dimensional structure by vapor deposition is shown below.
Basically, an organic compound such as a hydrocarbon is chemically pyrolyzed by CVD using transition metal ultrafine particles as a catalyst to obtain a fiber structure (hereinafter referred to as an intermediate), which is further subjected to high-temperature heat treatment to produce multilayer fine particles. Carbon fibers can be made.

  As the raw material organic compound, hydrocarbons such as benzene, toluene and xylene, alcohols such as carbon monoxide and ethanol can be used, but it is preferable to use at least two carbon compounds having different decomposition temperatures as a carbon source. . Note that at least two or more carbon compounds do not necessarily use two or more types of raw material organic compounds, and even when one type of raw material organic compound is used, the fiber structure In the body synthesis process, for example, a reaction such as hydrogen dealkylation of toluene or xylene occurs, and in the subsequent thermal decomposition reaction system, it becomes two or more carbon compounds having different decomposition temperatures. Including embodiments. The atmosphere gas is an inert gas such as argon, helium, or xenon, or hydrogen, and the catalyst is a transition metal such as iron, cobalt, or molybdenum, or a transition metal compound such as ferrocene or metal acetate, and sulfur or thiophene or sulfide. Use a mixture of sulfur compounds such as iron.

  The synthesis of the intermediate is carried out by using a CVD method such as hydrocarbon which is usually performed, evaporating a mixture of hydrocarbon and catalyst as raw materials, introducing hydrogen gas or the like into the reaction furnace as a carrier gas, Pyrolysis at a temperature of 1300 ° C. As a result, a plurality of fine carbon fiber structures (intermediates) having a sparse three-dimensional structure in which carbon fibers having an outer diameter of 15 to 100 nm are bonded to each other by granular parts grown using the catalyst particles as nuclei. Aggregates having a size of several centimeters to several tens of centimeters are synthesized.

The thermal cracking reaction of the hydrocarbon as a raw material mainly occurs on the surface of the granular particles grown using the catalyst particles or the core, and the recrystallization of carbon generated by the decomposition proceeds in a certain direction from the catalytic particles or granular materials. Grows in a fibrous form.
However, by intentionally changing the balance between the thermal decomposition rate and the growth rate, for example, using at least two or more carbon compounds having different decomposition temperatures as a carbon source as described above, the carbon material can be changed only in a one-dimensional direction. Without growing, the carbon material is grown three-dimensionally around the granular material. The growth of such three-dimensional fine carbon fibers does not depend only on the balance between the thermal decomposition rate and the growth rate, but the crystal surface selectivity of the catalyst particles, the residence time in the reactor, and the temperature distribution in the furnace It is also affected by such factors. In general, when the growth rate by recrystallization of carbon atoms is faster than the thermal decomposition rate of the raw organic compound as described above, the carbon material grows in a fibrous form, while the thermal decomposition rate is higher than the growth rate. Is faster, the carbon material grows in the direction of the circumferential surface of the catalyst particles. Therefore, by deliberately changing the balance between the pyrolysis rate and the growth rate, the growth of the carbon material as described above is made multi-directional under control to form a three-dimensional structure. It is something that can be done. In order to easily form the three-dimensional structure in which the fibers are bonded to each other by the granular material in the intermediate product to be produced, the composition of the catalyst, the residence time in the reaction furnace, the reaction temperature, and the gas It is preferable to optimize the temperature and the like.

  The intermediate obtained by heating and generating a mixed gas of catalyst and hydrocarbon at a constant temperature in the range of 800 to 1300 ° C. has a structure such that patch-like sheet pieces made of carbon atoms are bonded together, In the Raman spectroscopic analysis, a D band indicating that there are many defects appears very large. Moreover, the produced | generated intermediate body contains the unreacted raw material, non-fibrous carbon material, a tar content, and a catalyst metal.

  Accordingly, high temperature heat treatment at 2400 to 3000 ° C. is performed by an appropriate method in order to remove the catalyst metal and other residues from such an intermediate and to obtain an intended fine carbon fiber structure with few defects.

  That is, for example, the intermediate is heated at 800 to 1200 ° C. to remove volatile components such as unreacted raw materials and tars, and then annealed at a high temperature of 2400 to 3000 ° C. to prepare the desired structure. At the same time, the catalyst metal contained in the fiber is removed by evaporation. At this time, a reducing gas or a small amount of carbon monoxide gas may be added to the inert gas atmosphere in order to protect the material structure.

  When the intermediate is annealed at a temperature in the range of 2400 to 3000 ° C., the patch-like sheet pieces made of carbon atoms are bonded to each other to form a plurality of graphene sheet-like layers.

  Further, before or after such high-temperature heat treatment, the step of crushing the equivalent circle average diameter of the fine carbon fiber structure to several centimeters, and the equivalent circle average diameter of the fine carbon fiber structure subjected to the crush treatment The fine carbon fiber which has a desired circle equivalent average diameter is produced through the process of grind | pulverizing to 50-100 micrometers.

  The above manufacturing method is merely an example, and various conditions such as the type of metal and the type of gas may be changed. Moreover, you may use the multilayer fine carbon fiber produced by production methods other than a vapor phase growth method.

  The fine carbon fiber-containing aqueous adhesive is obtained by adding fine carbon fibers to a known aqueous adhesive. When a fine carbon fiber-containing water-based adhesive is produced by adding fine carbon fibers to the aqueous adhesive, the amount of fine carbon fibers added is from the viewpoint of obtaining an improved thermal conductivity and a stable dispersion state of the fine carbon fibers. It is preferable that it is 0.01-30 mass parts with respect to 100 mass parts of aqueous adhesives, More preferably, it is 0.2-20 mass parts, More preferably, it is 0.5-15 mass parts.

  From the same viewpoint, the amount of fine carbon fiber added is preferably 0.01 to 30 parts by mass with respect to 100 parts by mass of the main component solid content in the aqueous adhesive (particularly the resin content in the adhesive). More preferably, it is 0.1-10 mass parts, More preferably, it is 0.3-5 mass parts.

As the water-based adhesive to which fine carbon fibers are added, various known ones can be used without particular limitation, but vinyl acetate resin emulsion, acrylic resin emulsion, acrylic-styrene resin emulsion, styrene / butadiene system Resin latex (hereinafter referred to as SBR) and other emulsion type adhesives in which a synthetic resin polymer is dispersed in water, melamine-formaldehyde condensation resin, urea-melamine-formaldehyde cocondensation resin, phenol condensation resin, resorcinol condensation It is preferably a thermosetting condensation adhesive such as a resin, or an aqueous polymer isocyanate adhesive.
Usually, water-based adhesives are used for wood products, but when a decorative sheet obtained from a polyester resin or the like is adhered to a wood base material, solvent-based adhesives such as acrylic and polyurethane are used. In this case, fine carbon fibers may be added to the adhesive.

Examples of the resin component contained in the vinyl acetate resin emulsion include homopolymers or copolymers of vinyl acetate monomers such as vinyl acetate and vinyl propionate, and copolymers of vinyl acetate monomers with other vinyl monomers. Can be mentioned. Examples of the “other vinyl monomer” herein include those described in paragraph [0010] of JP-A-2005-344084.
Examples of the resin component contained in the SBR include a copolymer of a styrene monomer and a butadiene monomer, or a copolymer of these monomers and another vinyl monomer. Examples of the “other vinyl monomers” mentioned here include those described in paragraph [0017] of JP-A-2005-344084.
Examples of the resin component contained in the acrylic resin emulsion include a homopolymer or copolymer of an acrylate monomer, or a copolymer of an acrylate monomer and another vinyl monomer. Examples of the “other vinyl monomers” mentioned here include those described in paragraph [0015] of JP-A-2005-344084.
These adhesives can also be used individually by 1 type, and can also be used in combination of 2 or more type.

  The fine carbon fiber-containing aqueous adhesive is preferably prepared by adding fine carbon fibers to the aqueous adhesive. From the viewpoint of obtaining a stable dispersion state of fine carbon fibers, it is also preferable to add a fine carbon fiber dispersant together with the fine carbon fibers. When adding a fine carbon fiber and a fine carbon fiber dispersant, both may be added simultaneously or sequentially. Moreover, you may add alternately. When adding sequentially, it is more preferable to add a fine carbon fiber after adding a fine carbon fiber dispersing agent to an aqueous adhesive. Moreover, after adding a fine carbon fiber dispersing agent to a water-based adhesive, it is better to add a fine carbon fiber, and after carrying out a dispersion process and preparing a fine carbon fiber dispersion, an additive is added. In addition, it is preferable to sufficiently defibrate and disperse the aggregate of fine carbon fibers to obtain a fine carbon fiber dispersion liquid in which the aggregate is 5 μm or less. It is more preferable to add the fine carbon fiber dispersant and the fine carbon fiber, sufficiently disaggregate and disperse the fine carbon fiber aggregates in advance, and then add various desired additives. In particular, for additives such as resin components that exhibit viscosity in aqueous adhesives, if the additive is added during or prior to the dispersion of fine carbon fibers, the fine carbon fibers are used due to their viscosity. Sufficient defibration / dispersion of the agglomerates cannot be obtained, and agglomerates exceeding 5 μm remain, and there is a possibility that a fine carbon fiber dispersion in a desired dispersion state cannot be obtained.

  Furthermore, when it is going to disperse | distribute the fine carbon fiber exceeding 5 mass parts with respect to 100 mass parts of aqueous adhesives, after adding a fine carbon fiber dispersing agent to an aqueous adhesive beforehand and making it melt | dissolve, fine carbon fiber Is preferable for good dispersion of the fine carbon fibers.

  A general disperser can be used for the dispersion treatment in which fine carbon fibers are dispersed in the aqueous adhesive. For example, bead mill disperser, TK lab disper, TK fill mix, TK pipeline mixer, TK homomic line mill, TK homo jetter, TK unimixer, TK homomic line flow, TK azimu homo disper ), Homogenizer polytron (manufactured by Central Science Trading Co., Ltd.), homogenizer histron (manufactured by Nissin Medical Science Equipment Co., Ltd.), biomixer (manufactured by Nippon Seiki Seisakusho Co., Ltd.), turbo-type stirring Machines (manufactured by Kodaira Manufacturing Co., Ltd.), Ultra Dispers (manufactured by Asada Steel Co., Ltd.), Ebara Mileser (manufactured by Ebara Manufacturing Co., Ltd.), ultrasonic equipment or ultrasonic cleaners (manufactured by ASONE Corporation), etc. Can be mentioned. What is necessary is just to set suitably the conditions of this apparatus etc. when performing dispersion processing using these apparatuses according to the dispersion state of the desired fine carbon fiber.

  As the fine carbon fiber dispersant, an anionic, cationic or nonionic surfactant can be used. In the case of a solvent-based adhesive, a surfactant that dissolves in the solvent used is preferable, and an aqueous adhesive is used. In the case of an agent, it is preferable to use a water-soluble surfactant. A fine carbon fiber dispersing agent can also be used individually by 1 type, and can also be used in combination of 2 or more type.

  The addition amount of the fine carbon fiber dispersant with respect to the aqueous adhesive is preferably 0.1 to 200% by mass, more preferably 1 to 100% by mass with respect to the addition amount of the fine carbon fiber.

  In addition, the fine carbon fiber-containing water-based adhesive is further cross-linked for the purpose of preventing or reducing various problems such as blistering and warping that can occur during hot-pressure bonding, improving the finish of the product, and the filling effect of the adhesive. An additive such as a filler or a filler such as flour can be included, and the type and amount thereof are not particularly limited.

  Moreover, various well-known components conventionally mix | blended with the kind of water-based adhesive can also be mix | blended with the fine carbon fiber containing water-based adhesive as needed.

  In order to produce the above-described wood composite material by the wood product production method of the present invention, for example, the above-mentioned fine carbon fiber-containing water-based adhesive is applied to both surfaces or one surface of the above-mentioned base material, and the veneer is applied to the coated surface Etc. are introduced into a hot press such as a steam press and hot pressed. The temperature of the hot pressing is preferably 90 to 140 ° C., more preferably 100 to 120 ° C. from the viewpoint of balancing the shortening of the hot pressing time and the influence on the moisture content and warpage of the product. In addition, the hot pressing time can be determined as appropriate, but from the viewpoint of balancing the shortening of the hot pressing time with the curability of the adhesive used, for example, a wet press with a thickness of about 0.3 mm is used. In the case of producing a natural wood decorative plywood by bonding a decorative veneer, the time is preferably 25 to 45 seconds, more preferably 35 to 40 seconds.

According to the method for producing a woody product of the present invention, the heat from the hot press is well transferred to the adhesive by including the fine carbon fiber excellent in thermal conductivity in the adhesive, so that the adhesive is cured. The speed can be improved and the time required for hot-pressing individual wood products can be shortened. This improves the productivity of the wooden product.
Moreover, it is speculated that the initial adhesive force is increased by the anchor effect of the fine carbon fiber to the adherend, which contributes to shortening of the hot pressing time. On the other hand, when blended with carbon particles or carbon fiber-added adhesives, these have an outer diameter of several tens of μm and are bulky and difficult to get entangled compared to fine carbon fibers. To do.

Moreover, since the fine carbon fiber used in the present invention is not a curing accelerator such as MDI, the influence on the usable life of the adhesive is small.
Moreover, regarding the adhesive in which fine carbon fibers are dispersed, the storage stability in a long time is very good, and the storage stability comparable to that in which fine carbon fibers are not dispersed can be secured.

  As a method for applying the fine carbon fiber-containing water-based adhesive to the substrate, various known application methods can be used without particular limitation. For example, application by brush, brush, hand roller, application by roll coater, roll spreader Application by air spray, airless spray, low-pressure atomization spray, application by bar coder method, application using spin coater, dip coater, and the like.

  As described above, the method for producing a woody product of the present invention is a woody composite material in which a surface decorative material is bonded to one surface or both surfaces of a base material such as a specially processed plywood such as a natural wood decorative plywood. Instead of manufacturing, wood products such as plywood, veneer laminate (LVL), particle board (PB), fiber board, OSB, laminated wood, block board, etc. may be produced as wood products. . In these cases, when producing these wood materials in the same manner as in the conventional method, an adhesive containing fine carbon fibers is interposed between the single plates, or fine carbon fibers are included as a binder for bonding the elements together. Use an adhesive.

For example, when manufacturing a plywood or a veneer laminate, after laminating a plurality of veneers with an adhesive containing fine carbon fibers interposed between the veneers, these are integrated by hot pressing. To obtain a plywood or veneer laminate.
When manufacturing particle boards (PB), fiber boards, and OSBs, elements (cut pieces, small pieces, fibers, etc.) and an adhesive containing fine carbon fibers are mixed and formed, and then these are heated. A particle board (PB), fiber board, or OSB is obtained by hot-pressing integrally by pressing.
Moreover, when manufacturing laminated timber, block board, etc., it arranges so that a board, a small square material, and a block-like piece may become the target shape, and the adhesive agent which contains fine carbon fiber between them. Then, they are integrally heat-pressed by hot pressing to obtain a laminated material and a block board.
Also when manufacturing such a wooden product, the adhesive agent containing the fine carbon fiber mentioned above is used preferably.

  The wood material and composite wood material produced by the method for producing a wood product of the present invention can be preferably used for various uses, and the use is not particularly limited. For example, a construction material such as a ceiling, a floor, and a joinery, a desk (Top plate, etc.), furniture such as box shelf, chest, bed, etc., flooring, decorative flooring, stair tread, partition wall, etc. In addition, for wooden materials and composite wooden materials, a decorative sheet such as a resin film or decorative paper is applied to the surface that is in contact with the human eye, or a coating that improves strength or changes color is further applied. You may give it.

  Next, the present invention will be specifically described based on examples and comparative examples, but the present invention is not limited to the following examples. In the following description, “part” means “part by mass” and “%” means “% by mass” unless otherwise specified.

1. Preparation of adhesive [Adhesive a1]
100 parts vinyl acetate-based water-based adhesive (manufactured by Sumitomo Forestry Crest Co., Ltd., trade name “Instar Bond KH-1093”, solid content (resin content) 51%), hardener A (manufactured by Sumitomo Forestry Crest Co., Ltd., A product name "Hardener H-4000") 10 parts and others were mixed to obtain an adhesive a1.
[Adhesive a2]
An amount of fine carbon fiber corresponding to 3% of the solid content was blended and dispersed in the same aqueous adhesive (solid content (resin content) 51%) as that of the adhesive a1. And 100 parts of this dispersion was mixed with 10 parts of curing agent A to obtain an adhesive a2.

[Adhesive a3]
An amount of fine carbon fiber corresponding to 2.25% of the solid content was blended and dispersed in the same aqueous adhesive (solid content (resin content) 51%) as that of the adhesive a1. And 100 parts of this dispersion was mixed with 10 parts of curing agent A to obtain an adhesive a3.
[Adhesive a4]
An amount of fine carbon fiber corresponding to 1.5% of the solid content was mixed and dispersed in the same aqueous adhesive (solid content (resin content) 51%) as that of the adhesive a1. And 100 parts of this dispersion was mixed with 10 parts of curing agent A to obtain an adhesive a4.

[Adhesive b1]
SBR-based water-based adhesive (manufactured by Sumitomo Forestry Crest Co., Ltd., trade name “Instar Bond LB370”, solid content (resin content) 38%) 100 parts hardener B (Sumitomo Forestry Crest Co., Ltd., trade name) "Hardener H-370") 5 parts and others were mixed to obtain an adhesive b1.
[Adhesive b2]
An amount of fine carbon fiber corresponding to 3% of the solid content was blended and dispersed in the same aqueous adhesive (solid content (resin content) 38%) as the adhesive b1. And 100 parts of this dispersion was mixed with 5 parts of curing agent B and others to obtain an adhesive b2.

[Adhesive c1]
100 parts of SBR-based aqueous adhesive (solid content (resin content) 38%), 50 parts of urea / melamine-formaldehyde condensation adhesive (solid content (resin content) 52%), 30 parts of flour and ammonium chloride 0 .1 part was mixed uniformly to obtain an adhesive c1.
[Adhesive c2]
An amount of fine carbon fiber corresponding to 3% of the solid content was blended and dispersed in the same aqueous adhesive (solid content (resin content) 38%) as the adhesive c1. To 100 parts of this dispersion, 50 parts of urea / melamine / formaldehyde condensation adhesive (solid content (resin content) 52%), 30 parts of flour and 0.1 part of ammonium chloride were mixed uniformly. An adhesive c2 was obtained.

Table 1 shows the blending amount (parts) of fine carbon fibers with respect to 100 parts of the resin content of the aqueous adhesive for each of the obtained adhesives. In Table 1, numerical values in parentheses in each item above “curing agent A” indicate a solid content ratio (parts) in 100 parts of the adhesive (hereinafter referred to as main agent adhesive) described in each item. Each item from “curing agent A” to “ammonium chloride” indicates the amount of the substance added to 100 parts of the main agent adhesive (amount including water, part) and its solid content (part). The numerical value in parentheses in the “Total” section indicates the solid content ratio (actual measurement value) in the finally obtained adhesive. The solid content ratio of the curing agent A was 15%, the solid content ratio of the curing agent B was 8%, and the solid content ratio of the flour was 85%.
For the adhesives a2 to a4, b2 and c2, fine carbon fibers having an average diameter of 60 nm were used as fine carbon fibers.

2. Production and Evaluation of Composite Wood Material For each of Examples 1 to 12 and Comparative Examples 1 to 8, the adhesive shown in Table 2 was added to the plywood having a length and width of 300 mm and a thickness of 12 mm (67 or 100 g / m ² ) was applied, and a 0.3 mm thick oak wet veneer was placed. Then, hot press bonding was performed at 110 ° C. for 40 seconds or 60 seconds using a hot press (flat plate press). The press pressure was 0.6 MPa (constant). A knife test was performed immediately after decompression. Moreover, after curing this for 24 hours, based on the Japanese agricultural and forestry standard of a plywood, it cut | disconnected to the magnitude | size of 75 mm x 75 mm, and was set as the test piece, and the one-type immersion peeling test was done. The results are shown in Table 2.

Knife test Immediately after the pressure was released from the press, scratches were applied to the decorative veneer with a knife, the surface veneer was forcibly peeled from the scratched area, and the resistance when peeling was evaluated. The resistance when peeling is judged by human sense and visual observation, the resistance is extremely strong, and the adhesive layer has a very high material breakage rate `` ◎ '', the resistance when peeling is strong, Relative comparisons were made with “○” indicating that the adhesive layer had a high material breakage rate, and “△” indicating that the material had a low resistance to tearing and a low material breakage rate.

Type I immersion peeling test (boiling repeated test)
In accordance with the Japanese Agricultural Standards for Plywood (JAS Special Plywood Class 1 immersion peel test), the test piece is immersed in boiling water for 4 hours and then dried at a temperature of 60 ° C. for 20 hours. It was immersed for a period of time and further dried at 60 ° C. for 3 hours. After the test, based on conformity standards, “◎” indicates that no peeling occurred in the same adhesive layer, “◯” indicates that peeling did not occur 25 mm or more, and “0” indicates that peeling occurred 25 mm or more. Δ.

When Comparative Example 1 and Comparative Example 2 in Table 2 are compared, the result of the knife test is deteriorated due to the shortening of the press time (thermal pressing time). On the other hand, when Comparative Example 1 and Example 2 in Table 2 are compared, the knife test and the type 1 immersion peel test are performed although Example 2 has a shorter press time (thermal pressing time). The results are equivalent. Further, when Comparative Example 3 and Comparative Example 4 are compared, the results of the knife test and the Type 1 immersion peel test are deteriorated due to the shortening of the press time (thermal pressing time), whereas Comparative Example 3 and Example Compared with 4, the results of the knife test and the type 1 immersion peel test are the same in Example 4, although the press time (hot pressing time) is shorter.
That is, it can be seen that by adding fine carbon fibers, the hot pressing time can be shortened without sacrificing the deterioration of the bonding state or the bonding strength.

  Further, when comparing Comparative Example 1 and Example 3 in Table 2, the result of the knife test is improved in Example 3 although the amount of the adhesive is reduced. That is, it can be seen that by adding fine carbon fibers, the amount of adhesive can be reduced without increasing the hot pressing time.

As shown in Table 2, it can be seen that when fine carbon fibers are added to the adhesive, the initial adhesion is improved, and even if the pressing time is shortened, a single veneer decorative plywood (composite wood material) with good adhesion can be obtained. .
(Vinyl acetate adhesive)
With the adhesive containing fine carbon fibers, even when the press time was 2/3, adhesiveness almost equivalent to the normal condition was obtained. Further, even when the pressing time was 2/3 and the adhesive application amount was 2/3, the adhesiveness almost equivalent to the normal condition was obtained.
(SBR latex adhesive, SBR latex / urea / melamine-formaldehyde condensation adhesive)
As for these adhesives, the adhesive containing fine carbon fibers was able to obtain adhesiveness substantially equal to the normal conditions even when the press time was 2/3. Further, even when the pressing time was 2/3 and the adhesive application amount was 2/3, the adhesiveness almost equivalent to the normal condition was obtained.

  Thus, according to the present invention, for example, the press time in the hot press can be shortened to 2/3, and the production efficiency of the hot press process can be improved to 1.5 times the current level. It is.

Claims (1)

In a method for producing a wooden product, which is obtained by heat-pressing a production intermediate containing an adhesive to obtain a wooden product,
As the adhesive, you have use the adhesive after the outer diameter was dispersed in a blended disperser following fine carbon fibers 200nm in aqueous adhesive,
The wood product is obtained by bonding a surface decorative material to the one or both sides of a base material made of plywood, veneer laminate, particle board, fiber board, OSB, laminated board or block board via the adhesive. method for producing a wood based product, characterized in wood composite der Rukoto.