JPH0948090A - Veneer manufacturing method - Google Patents

Abstract

(57) [Summary] [Object] To provide a method for industrially advantageously producing a decorative sheet having an excellent aesthetic appearance and excellent surface hardness, abrasion resistance, and water resistance. [Structure] A curable composition comprising a chemically modified wood material, a thermosetting resin and a polymerization initiator is placed on a wood base material, on which an uncured thermosetting resin can penetrate and permeate. Place the decorative material and heat it. Furthermore, more preferably, a composition comprising a chemically modified wood material, a thermoplastic resin, a thermosetting resin and a polymerization initiator is formed into a sheet, and then the obtained sheet-shaped curable composition is placed on a wood base material. Further, a decorative material through which the uncured thermosetting resin can permeate and permeate is placed thereon and hot pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for industrially producing a decorative board having an excellent appearance and excellent surface hardness, abrasion resistance and water resistance.

[0002]

2. Description of the Related Art Conventionally, in order to improve the aesthetics, surface hardness, abrasion resistance and water resistance of wood, so-called WPC (Wood) is used in which wood is impregnated with a thermosetting resin under reduced pressure or pressure and heat-cured. Plastic Combination) processing method is known. However, this WPC process has a drawback that the process is complicated, the equipment is large, and the manufacturing cost is high. In addition, there is a problem that a resin film layer having sufficient surface hardness and abrasion resistance is not formed on the surface of the obtained treated wood. In addition, paper, non-woven fabric, which is made by impregnating the surface of wood with thermosetting resin, or
There is a method of overlaying cloth etc. However,
With this method, the fluidity of the resin impregnated in paper, non-woven fabric, or cloth is poor, and with large timbers such as conduits and temporary conduits,
There were problems such as poor adhesion and floating phenomenon. Further, there is a method of directly coating the wood surface with a thermosetting resin. This method is suitable for coating a large piece of wood such as a conduit or a temporary conduit, or a surface of wood having a rough surface. However, when the thermosetting resin is to be cured by heat and pressure, the thermosetting resin is rapidly reduced in viscosity before the curing by the crosslinking of the thermosetting resin is started. There was a drawback that it leaked out from the side of the wood. Further, the resin layer on the surface of the obtained treated wood has poor crack resistance and has a drawback that cracking is likely to occur.

Further, in Japanese Patent Publication No. 7-35109, a thermosetting resin material formed in a sheet shape is interposed between the back surface of the print coated paper and the wood base material, and the thermosetting resin material is heated and pressed. A method of manufacturing a composite board is disclosed in which a print-coated paper and a wood-based material are fixed to each other via a sheet. This method is characterized in that the print coated paper is used in order to prevent the thermosetting resin, which causes a decrease in viscosity when hot pressed, from seeping out to the surface of the print coated paper and contaminating the periphery of the apparatus.
However, even with this method, it was unavoidable that the curable resin, which had decreased in viscosity, also flowed out from the side surface of the wooden base material.

[0004]

SUMMARY OF THE INVENTION In view of the above situation, the present invention provides a wood board material, particularly a wood board material that is not aesthetically sufficient or has a low surface hardness, a decorative paper, a decorative veneer, etc. It has an excellent aesthetics by placing a curable composition between it and a hot press.
It is an object of the present invention to provide a method for industrially advantageously manufacturing a decorative sheet having excellent surface hardness, abrasion resistance, water resistance and the like.

[0005]

[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies on a method for solving the above problems. As a result, the curable composition in which the chemically modified wood material, the thermosetting resin and the polymerization initiator were added and mixed was placed between the wood base material and the decorative material, and the chemically modified wood material in the curable composition was plasticized. By heat-pressing with the pressure necessary for the curing, the chemically modified wood material in the curable composition is plasticized and the thermosetting resin is cross-linked, thereby integrating the wood base material and the decorative material. At the same time, the thermosetting resin in the curable composition has an excellent aesthetic appearance by permeating the cosmetic material into the cosmetic material, permeating the cosmetic material, exuding to the opposite surface, and curing. It has been found that a decorative board excellent in hardness, abrasion resistance and water resistance can be obtained, and the present invention has been completed.

That is, according to the present invention, a curable composition comprising a chemically modified wood material, a thermosetting resin and a polymerization initiator is placed on a wood base material, and further, an uncured thermosetting composition is placed thereon. Provided is a method for manufacturing a decorative board, which comprises placing a decorative material through which a resin penetrates and permeates, and applying heat.
More preferably, a sheet-shaped curable composition comprising a chemically modified wood material, a thermoplastic resin, a thermosetting resin and a polymerization initiator is placed on a wood base material, and the uncured thermosetting composition is further placed thereon. A method for manufacturing a decorative board is provided, in which a resin-penetrating or permeable cosmetic material is placed and hot pressed.
Further, there is provided a method for producing a decorative board, characterized in that the decorative material which can be penetrated and penetrated by the uncured thermosetting resin is ordinary decorative paper or a decorative veneer, and the thermoplastic resin is , 1 to 20 per 100 parts by weight of chemically modified wood
Provided is a method for producing a decorative board characterized by being mixed by adding parts by weight, and more preferably, the thermoplastic resin is an ethylene-vinyl acetate copolymer, and a method for producing a decorative board. And a thermosetting resin is added and mixed in an amount of 1 to 60 parts by weight with respect to 100 parts by weight of the chemically modified wood material, and a method for manufacturing a decorative board is provided, and more preferably , A thermosetting resin is an unsaturated polyester resin, a method for manufacturing a decorative board, characterized in that the chemically modified wood material, the wood material is reacted with a polybasic acid anhydride and an epoxy compound. There is provided a method for producing a decorative board, which is characterized in that it is an oligoesterified wood material, and more preferably,
At the production stage of the oligoesterified wood material, a thermoplastic resin is added and mixed, and the resulting mixture of the oligoesterified wood material and the thermoplastic resin is added and mixed with a thermosetting resin and a polymerization initiator to form a sheet. Thus, a method for producing a decorative board is provided, which comprises obtaining a sheet-shaped curable composition.

The chemically modified wood material used in the present invention is
A chemical substance is made to react with the hydroxyl group in the wood material, and depending on the type and amount of this chemical material, it is possible to impart thermoplasticity that was not originally provided in the wood material itself. In the present invention, it is preferable to use a chemically modified wood material having high thermoplasticity. Examples of these include JP-A-57-103804, JP-A-60-206602, and JP-A-60-206602.
58-32807, JP-A-60-188401, Nobuo Shiraishi: Journal of the Wood Research Society
vol.32, No.10, P755-762 (1986), Makoto Ogoshi: Journal of the Wood Research Society vo
L.36, No.1, P57-63 (1990), etc., esterified wood, etherified wood, acetylated wood, allylated wood, benzylated wood, lauroylated wood, ethylated wood, cyanoethylated wood Wood, further, oligoesterified wood obtained by reacting a hydroxyl group in a wood component with a dibasic acid anhydride and a monoepoxy compound having a polymerizable double bond disclosed in JP-A-2-145339, and further, acetyl. Cellulose, ethyl cellulose, carboxymethyl cellulose, and other cellulose derivatives can be used. Among these chemically modified wood materials, oligoesterified wood materials are particularly preferably used because the production process is simple and there are no by-products that need to be removed from the system after the reaction.

On the other hand, with respect to the wood material which is a raw material of the chemically modified wood material, there is no particular limitation on the species and shape of the wood material, and wood powder such as wood powder, wood fiber and wood chips can be used, and cellulose can be used. , Pulp, etc. can also be used. Furthermore, a large amount of unused straw, rice straw,
It is also possible to use plant fibers such as chaff, waste paper, linters and bagasse, or other crushed lignocellulosic materials containing cellulose or lignin as a main component.

As the thermosetting resin, unsaturated polyester resin, urea resin, melamine resin, phenol resin,
Silicon resin, epoxy resin, polyurethane resin, diallyl phthalate resin, etc. can be used.

On the other hand, known organic peroxides can be used as the polymerization initiator, and examples thereof include: diacyl such as: bis-3,5,5-trimethylhexanoyl peroxide, lauroyl peroxide and p-benzoyl peroxide. Peroxide: dicumyl peroxide, 2,5-dimethyl-2,5-di- (t-butylperoxy) -hexane, 1,3-bis- (t-butylperoxy-isopropyl) -benzene, t- Butyl cumyl peroxide,
Di-t-butyl peroxide, 2,5-dimethyl-
2,5-di- (t-butylperoxy) -hexene-
3, dialkyl peroxides such as tris- (t-butylperoxy) triazine: 2,4,4-trimethylpentylperoxy 2-ethylhexanoate, t-amylperoxy 2-ethylhexanoate, t-butyl Peroxy-2-ethylhexanoate, t-butylperoxy-isobutyrate, di-t-butylperoxy-
Alkyl peresters such as hexahydroterephthalate, t-butylperoxy 3,5,5-trimethylhexanoate, t-butylperoxyacetate, t-butylperoxybenzoate, di-t-butylperoxy-trimethyl-adipate : Di-3-methoxybutyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate, bis (4-t-butylcyclohexyl) peroxydicarbonate, diisopropyl peroxydicarbonate, t-butyl peroxyisopropyl carbonate, etc. These percarbonates and the like can be used alone or in combination of two or more kinds. The blending amount is 0.1 with respect to 100 parts by weight of the thermosetting resin.
To 20 parts by weight, and more preferably 1.0 to 10 parts by weight.

As will be described later, in the present invention, as a more preferred embodiment, a curable composition comprising a chemically modified wood material, a thermoplastic resin, a thermosetting resin and a polymerization initiator is formed into a sheet in advance, and then, The obtained sheet-shaped curable composition is brought into contact with a wooden base material, and a decorative material is placed thereon and hot pressed. When using this method, chemically modified wood material, thermoplastic resin, thermosetting resin,
In the step of adding and mixing the polymerization initiator to form a sheet, it is preferable that the polymerization initiator is less likely to decompose. From this meaning, dicumyl peroxide, 2,5-dimethyl-2,
5-di- (t-butylperoxy) -hexane, 1,3
-Bis- (t-butylperoxy-isopropyl) -benzene, t-butylcumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-di-
(T-Butylperoxy) -hexene-3, tris-
(T-butylperoxy) triazine, t-butylperoxy 3,5,5-trimethylhexanoate, t-butylperoxyacetate, t-butylperoxybenzoate, t-butylperoxyisopropyl carbonate, etc. for 1 minute Those having a half-life temperature of 140 ° C. or higher are more preferably used.

In the present invention, an uncured thermosetting resin is infiltrated as a decorative material which is hot-pressed and laminated on a wood base material,
Any transparent material may be used, and typical ones include plain decorative paper (untreated decorative paper), veneer, decorative veneer,
Examples include non-woven fabric. Among these, plain decorative paper and decorative veneer are particularly preferably used from the aesthetic point of view. Further, as the wood base material, regardless of the tree species, further, plant fibers directly formed from wood, plywood, particle board, fiber board, OSB, laminated wood, LVL, bagasse, chaff, etc. Any wood board can be used regardless of whether it is a wood-based material, but wood boards obtained from trees with soft surfaces such as larch, cedar, cypress, cypress, hou, and wigs, and trees with unclear grain patterns. Can more effectively enjoy the effect of the present invention. In addition, a monomer, prepolymer, polymer, etc. previously injected into the above-mentioned wood base material, or after injection,
It is also possible to use a cured product.

As will be described later, in the present invention, as a more preferred embodiment, a curable composition comprising a chemically modified wood material, a thermoplastic resin, a thermosetting resin and a polymerization initiator is formed into a sheet in advance, and then, The obtained sheet-shaped curable composition is placed on a wood-based substrate, and a decorative material through which an uncured thermosetting resin can permeate and permeate is further placed thereon and hot pressed. Examples of the thermoplastic resin used here include low-density polyethylene, high-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, polypropylene, polybutene-1, ethylene-vinyl acetate copolymer, polyethylene oxide and methyl methacrylate. -Butadiene-styrene copolymer, soft polyvinyl chloride, ethylene-ethyl acrylate copolymer, ethylene-ethyl acrylate-maleic anhydride copolymer, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene -Methyl methacrylate copolymer, thermoplastic polyurethane, ionomer,
Aromatic polyesters, aliphatic polyesters, etc. may be mentioned, and these may be used alone or in a mixture of plural kinds. The thermoplastic resin used in the present invention is preferably one that can efficiently contain a chemically modified wood material, a thermosetting resin, and a polymerization initiator, and that can be kneaded at a temperature at which decomposition of the polymerization initiator can be avoided. From this meaning, the Vicat softening point is 120 among the above thermoplastic resins.
C. or less, more preferably a Vicat softening point of 90.degree. C. or less, more preferably an ethylene-vinyl acetate copolymer, and further, an ethylene-vinyl acetate copolymer having a vinyl acetate content of 10 to 50% by weight. However, it is more preferable because the Vicat softening point is 80 ° C. or lower. The blending amount of the thermoplastic resin is 1 to 20 parts by weight, more preferably 2 to 100 parts by weight of the chemically modified wood material.
It is preferably 10 parts by weight. If the blending amount of the thermoplastic resin is within the range of 1 to 20 parts by weight, the chemically modified wood material,
When mixed with a thermosetting resin and a polymerization initiator to form a sheet,
These are preferable because they can be included efficiently and the resulting decorative plate does not impair the heat distortion resistance.

Others In the present invention, the curing characteristics of the curable composition, and a plasticizer, an internal release agent, known to the curable composition within a range that does not deteriorate the characteristics of the cured composition,
It does not prevent the compounding of inorganic fillers, flame retardants, antibacterial agents, pigments, dyes, antioxidants, ultraviolet absorbers, light stabilizers, fragrances and the like.

Next, a specific manufacturing procedure of the method for manufacturing a decorative board of the present invention will be described. First, a thermosetting resin and a polymerization initiator are added to and mixed with a chemically modified wood material to prepare a curable composition. The means for mixing these is not particularly limited, and for example, a kneader such as a blender, a kneader, a mixing roll, a Banbury mixer, or a single-screw or twin-screw extruder can be used. When it is desired to reduce the viscosity of the thermosetting resin in order to improve the workability of the kneading work, heating may be performed to such an extent that decomposition of the polymerization initiator does not occur.

In the present invention, as a more preferred embodiment, a sheet-shaped curable composition comprising a chemically modified wood material, a thermosetting resin, a polymerization initiator, and a thermoplastic resin is used. By thus adding the thermoplastic resin, the kneading of the curable composition becomes very effective, and the thickness of the sheet can be adjusted relatively easily. The uniformity of is good. Therefore, the sheet-like curable composition is placed on the wooden base material, the decorative material is further placed on it, and the surface smoothness of the decorative sheet obtained by thermocompression molding is further improved. . Further, since the fluidity of the curable composition at the time of hot pressing is better, there is an advantage that the pressure at hot pressing can be set lower. On the other hand, the means for mixing these is not particularly limited, for example,
It can be carried out using a kneader such as a blender, a kneader, a mixing roll, a Banbury mixer, or a single-screw or twin-screw extruder. When a mixing roll is used for kneading, it is efficient because it can be formed into a sheet simultaneously with kneading. Furthermore, attach a T die to a single-screw or twin-screw extruder.
By extruding through a slit provided in the die, kneading and sheet formation can be performed efficiently. Also,
When the kneading and the sheeting are not simultaneously performed and the kneading and the sheeting are secondarily performed after the kneading, the kneading curable composition is supplied to a calender film forming apparatus, a mixing roll or the like. Regarding the temperature at the time of forming into a sheet, it is desirable to set it in a temperature range in which the thermoplastic resin is softened and can be uniformly dispersed, and the crosslinking reaction of the thermosetting resin does not proceed.

Next, the curable composition thus obtained is placed on a wood base material. Then, a decorative material through which the uncured thermosetting resin can permeate and permeate is placed thereon. Then, by thermocompression molding for a required time, the wooden base material and the decorative material are integrated, and at the same time, the thermosetting resin in the curable composition penetrates into the decorative material and exudes to the opposite surface. Let it cure. Of course, it does not matter if the decorative material, the curable composition, and the wood base material are placed in this order.

Furthermore, during thermocompression molding, a pressure may be applied to the wood base material so as to consolidate it. By doing so, the hardness and strength of the wooden base material are improved. In the thermocompression molding, if a smooth mirror plate is applied to the surface of the sheet-shaped curable composition and then the thermocompression molding is performed, the surface of the obtained decorative plate becomes smoother, which is aesthetically preferable. In the same manner, in the thermocompression molding, if a sheet having an embossed pattern on the surface of the sheet-shaped curable composition is applied and then thermocompression molded, the embossed pattern is transferred to the surface of the obtained decorative board, It becomes a design thing.

The amount of the curable composition to be placed differs depending on the material and thickness of the wood base material, the surface condition, the material and thickness of the decorative material, the appearance of the decorative plate to be manufactured, and the like.
The amount of lamination of the curable composition when the veneer is to be obtained a smooth makeup is sufficient from 0.05 kg / m ² at 1.0kg / m ^2, when subjected to the embossed pattern is 1.0kg It is preferable to laminate a curable composition of / m ² or more. Further, in order to solve the problem of warping due to the curing shrinkage stress of the curable composition that is seen when using a thin wood base material, the curable composition used in the present invention on the back surface of the wood base material. An object, a wood powder spray-coated with a liquid of a thermosetting resin, or a thermosetting resin-impregnated paper may be positioned and heated. By doing so, warping of the decorative plate can be prevented.

The heating and pressurizing conditions are appropriately set depending on the type of decorative board, the type of polymerization initiator, the type of thermosetting resin, and the type of chemically modified wood material. Generally, the heating temperature is 10
A range of 0 to 200 ° C is suitable. The pressure may be the pressure required for the chemically modified wood material component to plasticize at that temperature, generally 10 to 200 kg / cm ² , and preferably 20 to 50 kg / cm ² . The pressing time may be about 1 to 20 minutes. Under these hot-pressing conditions, the sheet-shaped curable composition is plasticized and crosslinked, and a part of the sheet-shaped curable composition is impregnated into the wood base material and cured. The wood substrate is reinforced.

When an oligoesterified wood material is used as the chemically modified wood material, it is desirable to add and mix a thermoplastic resin at the production stage of the oligoesterified wood material. By doing so, the respective components in the curable composition are evenly dispersed, so that the unevenness of the final cosmetic surface can be further reduced.

Further, in the present invention, the blending amount of the thermosetting resin is 1 to 6 with respect to 100 parts by weight of the chemically modified wood material.
It is preferably 0 parts by weight. By setting the blending amount of the thermosetting resin in this range, the surface hardness and wear resistance of the decorative board obtained will be good, and the thermosetting resin whose viscosity has decreased during thermocompression molding is wood-based. It is preferable because it does not flow out from the side surface of the base material. Further, it is more preferable to use an unsaturated polyester resin as the thermosetting resin in the above blending amount because it has a good affinity with the chemically modified wood material.

[0023]

A feature of the present invention is that a curable composition comprising a chemically modified wood material, a thermosetting resin and a polymerization initiator is placed on a wood base material, and further, an uncured thermosetting resin is placed thereon. It is to place a cosmetic material that can penetrate and permeate and heat it. By doing so, the thermosetting resin in the curable composition mainly permeates the decorative material, and further exudes to the opposite surface to be cured. Therefore, the wood base material and the decorative material are firmly integrated by the thermosetting resin and the chemically modified wood material. As a result, the problem that a floating phenomenon occurs due to defective adhesion, which has been a problem in the past, is solved. In addition, the decorative sheet thus obtained has an excellent appearance and gives a surface excellent in surface smoothness, surface hardness, abrasion resistance and dipping resistance.

Further, according to this method, a smooth and transparent coating layer can be formed on the surface of a decorative board without using a wood base material having a non-smooth surface or without applying a hardening treatment to the surface of the decorative board. Then, the decorative board has a beautiful appearance in which the pattern such as wood grain of the decorative material is very clearly revealed through the coating layer.

Further, the chemically modified wood material contained in the curable composition causes a rapid decrease in viscosity of the thermosetting resin before the curing by the crosslinking of the thermosetting resin starts in the hot pressing step. The problem that the thermosetting resin flows out from the side surface of the wooden base material is solved. In addition, there is an advantage that the thermosetting resin in the curable composition that permeates and permeates into the cosmetic material during hot pressing can be maintained in an appropriate amount. This is because when the thermosetting resin undergoes a rapid decrease in viscosity during the thermocompression molding process, the chemically modified wood material
Since it is not yet in a sufficiently plasticized state and still retains the properties of powder, it is considered that it absorbs the thermosetting resin whose viscosity has been lowered and acts to prevent outflow.

[0026]

[Thermosetting resin]

・ Unsaturated polyester (N-34 manufactured by Nippon Shokubai Co., Ltd.)
0HV ") [Polymerization initiator] -Dicumyl peroxide (manufactured by Kayaku Akzo Co., Ltd.," Mitsui DCP ", half-life temperature in 1 minute: 179 ° C) [Thermoplastic resin] -Ethylene-vinyl acetate copolymer Combined (Sumitomo Chemical Co., Ltd.)
Made, "Smitate KA-3", vinyl acetate content: 28w
t%, Vicat softening point: 39 ° C) -Ethylene-ethyl acrylate-maleic anhydride copolymer (manufactured by Sumitomo CDF, "Bondaine TX8"
030 ", Vicat softening point: 68 ° C) Meanwhile, the measurement of physical properties shown in the following Examples and Comparative Examples complied with the following standards.・ Scratch hardness test B test: JAS special plywood ・ Type 1 immersion peeling test: JAS special plywood ・ Abrasion resistance test: JIS A1453 (total number of revolutions 1000 times) ・ Impact resistance test: JIS A5908

[Example 1] Dry wood powder (trade name: LIGNOCEL
S-150TR; manufactured by J. Rettenmaier & Sohne) 750 g, maleic anhydride 100 g, and ethylene-vinyl acetate copolymer 50 g were charged in a pressure type kneader and reacted at 115 ° C. for 1 hour with stirring. Then, allyl glycidyl ether (manufactured by Daiso Co., Ltd., "Neoallyl G") 1
50 g was added, and the mixture was further reacted at 115 ° C. for 1 hour with stirring. Next, 300 g of the obtained oligoesterified wood material, ethylene-vinyl acetate copolymer mixture, 120 g of unsaturated polyester resin, and 9 g of dicumyl peroxide were mixed with a mixing roll until uniform, and then the mixture was thickened. A sheet-shaped curable composition was obtained by taking out a sheet having a size of 0.4 mm and a width of 30 cm. Note that no intentional heating was performed during mixing with the mixing roll. Next, ordinary decorative paper (30 g / m ² ) is placed on a mirror plate, the curable composition in sheet form is placed thereon, and the size 30
A cm × 30 cm × 1.5 cm particle board was placed and inserted between the hot plates of the press machine, and thermocompression molding was performed for 5 minutes under the heat and pressure conditions of a temperature of 150 ° C. and a pressure of 20 kgf / cm ² . The surface of the decorative board thus obtained was tough, hard, dense, and had an excellent aesthetic appearance like a glossy plastic. Further, the hardness, dipping resistance, abrasion resistance, and impact resistance of this decorative plate were evaluated. Table 1 shows the results.

[Example 2] 750 g of dried sander powder of particle board (water content: 0.5%, which passed through 80 mesh sieve), 100 g of maleic anhydride, and 50 g of ethylene-vinyl acetate copolymer were pressurized. The mixture was charged in a kneader and reacted at 115 ° C. for 1 hour with stirring. After that, allyl glycidyl ether (manufactured by Daiso Co., Ltd.,
"Neoallyl G") 150 g, and then 115
The mixture was reacted at 0 ° C. for 1 hour with stirring. Next, 300 g of the mixture of the obtained oligoesterified wood material and ethylene-vinyl acetate copolymer, 100 g of the unsaturated polyester resin, and 7.5 g of dicumyl peroxide were mixed with a mixing roll until uniform, and then the mixture was mixed. A sheet-shaped curable composition was obtained by removing the mixture into a sheet having a thickness of 0.4 mm and a width of 30 cm. Note that no intentional heating was performed during mixing with the mixing roll. Next, ordinary decorative paper (30 g / m ² ) is placed on the mirror surface plate, and the curable composition in sheet form is placed thereon,
Furthermore, the size is 30 cm x 30 cm x 1.5 cm.
The particle board of No. 2 was placed and inserted between the hot plates of the press machine, and thermocompression molding was carried out for 5 minutes under the conditions of a temperature of 150 ° C. and a pressure of 20 kgf / cm ² . The surface of the decorative board thus obtained was tough, hard, dense, and had an excellent aesthetic appearance like a glossy plastic.
Further, the hardness, dipping resistance, abrasion resistance, and impact resistance of this decorative plate were evaluated. Table 1 shows the results.

[Example 3] Dry wood powder (water content: 0.7
%, Product name: LIGNOCEL S-150TR; J.Rettenmaier & Sohne
KK; Fiber length: 30-60 μ) 750 g, maleic anhydride 100 g, and ethylene-ethyl acrylate-
A maleic anhydride copolymer (100 g) was charged into a pressure type kneader and reacted at 115 ° C. for 1 hour with stirring. After that, allyl glycidyl ether (manufactured by Daiso Co., Ltd.,
"Neoallyl G") 150 g, and then 115
The mixture was reacted at 0 ° C. for 1 hour with stirring. Next, the obtained oligoesterified wood material and ethylene-ethyl acrylate-
300 g of a maleic anhydride copolymer reaction product, 100 g of an unsaturated polyester resin, and 7.5 g of dicumyl peroxide were mixed with a mixing roll until uniform, and then the mixture was formed into a sheet having a thickness of 0.4 mm and a width of 30 cm. The sheet-shaped curable composition was obtained by taking out the curable composition. Note that no intentional heating was performed during mixing with the mixing roll. Next, ordinary decorative paper (30 g / m ² ) is placed on a mirror plate, the curable composition in sheet form is placed thereon, and the size 30
A cm × 30 cm × 1.5 cm particle board was placed and inserted between the hot plates of the press machine, and thermocompression molding was performed for 5 minutes under the heat and pressure conditions of temperature 150 ° C. and pressure 20 kgf / cm ² . The surface of the decorative board thus obtained was tough, hard, dense, and had an excellent aesthetic appearance like a glossy plastic. Further, the hardness, dipping resistance, abrasion resistance, and impact resistance of the obtained decorative board were evaluated. Table 1 shows the results. [Example 4]

Cellulose acetate (water content: 0.5
%, Trade name: L-AC, DS2.4, Daicel Chemical Industries Ltd. 700 g, dimethyl phthalate 300 g, and ethylene-vinyl acetate copolymer 50 g were charged in a pressure type kneader, and at 115 ° C. for 1 hour. Stirred. Next, 300 g of the obtained mixture of cellulose acetate, dimethyl phthalate and ethylene-vinyl acetate copolymer, 120 g of unsaturated polyester resin, and 9 g of dicumyl peroxide were mixed with a mixing roll until uniform, and then the mixture was mixed. Was taken out as a sheet having a thickness of 0.4 mm and a width of 30 cm to obtain a sheet-shaped curable composition. Note that no intentional heating was performed during mixing with the mixing roll. Next, ordinary decorative paper (30 g / m ² ) is placed on a mirror plate, the curable composition in sheet form is placed thereon, and the size 30
A cm × 30 cm × 1.5 cm particle board was placed and inserted between the hot plates of the press machine, and thermocompression molding was performed for 5 minutes under the heat and pressure conditions of temperature 150 ° C. and pressure 20 kgf / cm ² . The surface of the decorative board thus obtained was tough, hard, dense, and had an excellent aesthetic appearance like a glossy plastic. Further, the hardness, dipping resistance, abrasion resistance, and impact resistance of this decorative plate were evaluated. Table 1 shows the results. [Comparative Example 1]

Dry wood flour (water content: 0.7%, trade name: LI
GNOCEL S-150TR; made by J. Rettenmaier &Sohne; fiber length:
30-60 μ) 300 g and ethylene-vinyl acetate copolymer 20 g were charged in a pressure type kneader to give unsaturated polyester resin 120 g and dicumyl peroxide 9 g.
Was mixed into a mixing roll, but the dry wood powder and the unsaturated polyester resin were poorly compatible with each other and only a powdery curable composition was obtained. Next, plain decorative paper (30 g /
m ² ) is placed on a mirror surface plate, the curable composition is sprinkled (forming) thereon, and a size of 30 c is further applied.
A m × 30 cm × 1.5 cm particle board was placed and inserted between the hot plates of the press machine, and thermocompression molding was performed for 5 minutes under the heat and pressure conditions of temperature 150 ° C. and pressure 20 kgf / cm ² . The decorative board thus obtained had no surface smoothness and was not glossy. Further, the hardness, dipping resistance, abrasion resistance, and impact resistance of this decorative plate were evaluated. Table 1 shows the results.

[Comparative Example 2] 30 cm × 30 cm × 1.5
40g / m ² of urea resin on cm particle board
After coating, put ordinary decorative paper (30 g / m ² ) on it, insert it between the hot plates of the press machine, and heat-press molding for 20 seconds at a temperature of 130 ° C. and a pressure of 20 kgf / cm ² hot-pressing. Then, a decorative board was obtained. The hardness, dipping resistance, abrasion resistance, and impact resistance of the thus obtained decorative sheet were evaluated. Table 1 shows the results.

As is apparent from Table 1, the decorative board obtained by the present invention has sufficient surface hardness, dipping resistance and peeling resistance,
It has abrasion resistance and impact resistance.

[0034]

[Table 1]

[0035]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, there is provided a method for industrially producing a decorative board having an excellent aesthetic appearance and excellent surface hardness, abrasion resistance and water resistance. To be done. The decorative board obtained by this manufacturing method has a smooth surface, has an excellent aesthetic appearance, and is excellent in surface hardness, abrasion resistance, water resistance and the like. In addition, the present production method can produce a decorative board having an excellent aesthetic appearance even from a tree having a soft surface or a tree having a poor grain pattern, regardless of a wooden base material. Thus, the present invention provides a method for manufacturing a decorative board that is preferably used in the field of building materials.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Matsuda ▲ Hide ▼ Akira 1515 Nakatsu-cho, Marugame-shi, Kagawa Inside Okura Industrial Co., Ltd.

Claims (9)

[Claims] 1. A curable composition comprising a chemically modified wood material, a thermosetting resin and a polymerization initiator is placed on a wood base material,
A method of manufacturing a decorative board, further comprising placing a decorative material on which an uncured thermosetting resin can penetrate and permeate and heat-pressing it. 2. A sheet-like curable composition comprising a chemically modified wood material, a thermoplastic resin, a thermosetting resin and a polymerization initiator is placed on a wood base material, and further uncured thermosetting is placed thereon. A method for manufacturing a decorative plate, comprising placing a decorative material that allows the resin to permeate and permeate and applying heat. 3. The production of a decorative board according to claim 1, wherein the decorative material through which the uncured thermosetting resin can permeate and permeate is a plain decorative paper or a decorative veneer. Method. 4. The thermoplastic resin is a chemically modified wood material 100.
The method for producing a decorative board according to any one of claims 2 to 3, wherein 1 to 20 parts by weight is added and mixed with respect to parts by weight. 5. The method for producing a decorative board according to claim 2, wherein the thermoplastic resin is an ethylene-vinyl acetate copolymer. 6. The thermosetting resin is a chemically modified wood material 100.
The method for producing a decorative board according to any one of claims 1 to 5, wherein 1 to 60 parts by weight is added and mixed with respect to parts by weight. 7. The method for manufacturing a decorative board according to claim 1, wherein the thermosetting resin is an unsaturated polyester resin. 8. The chemically modified wood material is an oligoesterified wood material obtained by reacting a wood material with a polybasic acid anhydride and an epoxy compound, according to any one of claims 1 to 7. Manufacturing method of the decorative board. 9. A thermoplastic resin is added and mixed in the step of producing an oligoesterified wood material, and a thermosetting resin and a polymerization initiator are added and mixed to the obtained mixture of the oligoesterified wood material and the thermoplastic resin. Then, the sheet-like curable composition is obtained by forming a sheet into a sheet, and the method for producing a decorative board according to claim 8, wherein.