JP2000351104A - Woody board and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To largely suppress a contamination of a surface decorative material based on an alkali by adhesively laminating a woody fiber plate and the material in the state that its laminated surfaces are coated with an acid substance. SOLUTION: A woody fiber plate and a surface decorate material to become laminated surfaces are adhesively laminated in the state that the surfaces are coated with an acid substance. As the substance, an inorganic acid such as formic acid, acetic acid, propionic acid, oxalic acid, tartaric acid, succinic acid, maleic acid, lactic acid or the like, an acid salt such as aluminum sulfate, ammonium chloride or the like is used, and one or more types of them are used in combination. A coating amount of the substance is selected in response to an alkalinity or an amount of a phenol resin to be used so that a pH of the laminated surface of at least the decorative material of the fiber plate may become 4.0 to 1.0 or a pH of the material in the board after adhesively laminating may become 4.0 to 7.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood board and a method for manufacturing the same, and more particularly, to a wood fiber board formed by hot pressing a wood fiber chip into a plate shape with a binder. The present invention relates to a wooden board manufactured by bonding and laminating a surface decorative material, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a wood board is manufactured by bonding and laminating a veneer or decorative paper as a surface decorative material on the surface of a wood fiber board such as MDF or particle board as a base material or a part of the base material. And it is used as floor material and wall material. In the manufacture of wood fiberboard, phenolic resin and other formaldehyde-based adhesives emit less formaldehyde than urea-based resins and melamine-based resins, and are superior in weather resistance. It is widely used as in the case of system resins.

[0003]

Among the phenolic resins, among the phenolic resins, the resol-type phenolic resin becomes sodium phenoxide in the presence of sodium, is rendered water-soluble and stabilized, and after curing, suppresses the release of formaldehyde due to decomposition of the resin. It is also known that the amount of formaldehyde released further decreases. However, resol-type phenolic resins commonly used in the manufacture of wood fiberboard are highly alkaline, and wood fiberboard using resol-type phenolic resin as a binder can be used as a base material for decorative boards or structural materials. When it is used as a part of, the veneer or decorative paper used as a surface decorative material is discolored to black, and there is a drawback that the surface decorative material is easily contaminated, such as the formation of a colored extract when wet with water. It has the disadvantage that the range is limited.

[0004] Even among resole type phenolic resins, those having low alkalinity or almost neutrality exist, and the use of such a resin can solve the above-mentioned disadvantages, but the release is higher than that of strong alkalinity. As a binder for wood fiberboard production, it is usually used for reasons such as a large amount of formaldehyde, insufficient stability, a long curing time of the resin, a long time for hot pressing and a lack of actual productivity, etc. , Not used. Although used in some cases, the amount of formaldehyde released may increase due to poor curing of the resin.

[0005] The present invention has been made in view of these circumstances, and in particular, a wood fiber board manufactured using a highly alkaline resol-type phenolic resin as a binder is used as a base material or a part of the base material. A wood board that can significantly suppress the occurrence of contamination such as blackening of a veneer or decorative paper that is adhered and laminated thereon, i.e., the occurrence of alkali contamination on the surface decorative material, even though it is a wood board that does It is intended to provide a manufacturing method.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a wood fiber board using a resol-type phenolic resin as a binder and a veneer (surface decorative material). In the case where an acidic substance is interposed and the veneer is bonded and laminated, it is found that by applying an appropriate amount of the acidic substance, alkali contamination such as discoloration does not appear on the surface of the veneer. Based on this, the present invention has been accomplished.

That is, the present invention relates to a wooden board obtained by bonding and laminating a surface decorative material to a wooden fiber plate using a resol-type phenolic resin as a binder, wherein the wooden fiber plate and the surface decorative material have an acidic surface. When manufacturing a wood board by bonding and laminating a surface decorative material to a wood board, which is bonded and laminated with a substance applied thereto, and a wood fiber board using a phenolic resin as a binder, A method for producing a wood board, comprising bonding and laminating a wood fiber board and a surface decorative material in a state where an acidic substance is applied to one or both of a wood fiber board and / or a surface decorative material to be a surface.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the present invention, the resole type phenolic resin used as a binder is a resin in which one or more hydroxyl groups are bonded to a benzene ring or a derivative thereof. For example, phenol, one or more phenols such as resorcinol, and aldehydes (Formaldehyde) in the presence of an alkaline catalyst. Such phenolic resins, when used in the manufacture of wood fiberboard,
It is a preferable material because it releases a small amount of formaldehyde after curing and has weather resistance. In particular, the resole type phenolic resin is more effective since the amount of formaldehyde released after curing is further reduced.

[0009] The resole type phenolic resin is usually p
H is about 11 to 12, but an alkali metal hydroxide, which is sodium hydroxide (NaOH), is used as a catalyst, and the molar ratio of alkali metal hydroxide (AOH) to phenols (P) (AOH / P) is 0.1 to 0.3, and the resole type phenolic resin has a pH of about 10, so that alkali contamination can be reduced to some extent from the beginning, and the amount of acidic substance applied can be reduced. There is an advantage that can be reduced.

In the present invention, the wood fiberboard is MDF.
It is a product obtained by hot-press molding a thin piece, a chip, or a powdery wood fiber into a plate shape using the phenolic resin as a binder, such as a particle board or a particle board. It may be a single layer or a multilayer in the thickness direction. In the present invention, the acidic substance refers to p in a normal chemical treatment method.
Any substance that can change the H value from an alkaline side to an acidic side may be used in general, and organic acids such as formic acid, acetic acid, propionic acid, bromic acid, tartaric acid, succinic acid, maleic acid, and lactic acid, or hydrochloric acid and sulfuric acid And inorganic acids such as phosphoric acid and nitric acid, or acid salts such as aluminum sulfate and ammonium chloride. They may be used alone or in combination of two or more.

In the present invention, the wood fiber board as the base material or a part of the base material is mixed and stirred with the wood fiber and the phenolic resin according to a normal manufacturing method, and heated using a normal manufacturing apparatus. It may be formed by pressing.
In relation to the binder used, the wood fiberboard produced exhibits alkalinity. In the present invention, the surface decorative material generally refers to a material that is adhered and laminated on the surface when manufacturing the floor material or wall material using the wood fiber board as a base material or a part of the base material. The material may be any material such as a veneer or a decorative paper in which a decorative layer is appropriately provided on thin paper.

In the present invention, the wood board means that the surface decorative material is bonded to the wood fiber board by using, for example, a mixture of a urea resin and a vinyl acetate emulsion as an adhesive, for example, by hot pressure treatment. Means what you do. At that time, the wood fiber board and the surface decorative material are bonded and laminated with the acidic substance applied to the laminating surface. The application of the acidic substance may be performed on only one of the bonding surfaces when the wooden fiberboard and the surface decorative material are bonded and laminated, or may be performed on both of them. In the case of applying to the surface of the wood fiber board, the application of the acidic substance may be performed immediately after the manufacture of the wood fiber board, or may be performed when the surface decorative material is bonded and laminated.

The amount of the acidic substance applied is such that the pH of at least the surface of the wood fiberboard laminated with the surface decorative material is 4.0 to 7.0.
It is experimentally selected according to the alkalinity and amount of the phenolic resin to be used so that the pH value of the surface decorative material on the wooden board after bonding and lamination can be 4.0 to 7.0. You. By doing so, it is possible to avoid the occurrence of blackening or bluish blacking due to alkali contamination of the surface decorative material. If it is desired to lighten the surface decorative material, the pH may be set to less than 4.0. However, when the pH exceeds 7.0, alkali contamination occurs on the surface decorative material, which is not preferable. The application of the acidic substance is preferably performed by a spray or a roll as a low-concentration aqueous solution because uniform dispersion can be achieved, but the acidic substance may be applied in a form such as application using a flow coater.

In the present invention, urea, melamine, resorzine, hydrogen peroxide, acid amide, ammonium salt, amine,
Formaldehyde scavengers that can react with formaldehyde, such as catechin and tannic acid, can be added during the production of wood fiberboard. Among them, urea is set at a predetermined temperature (approximately 1) at the time of hot pressing at the time of wood fiberboard production.
(Approximately 70 ° C. or higher), it has been found that the time required for hot pressing is reduced, and this is particularly effective.

According to the present invention, the surface of a decorative veneer or a decorative paper stuck to the surface of a wood fiber board which is a base material or a part of the base material by a manufacturing method substantially similar to that of a conventional wood board. It is possible to obtain a wood board which does not cause discoloration of the decorative material and does not cause contamination by a red extract or the like resulting from water wetting when used as a structural material, and furthermore, releases a small amount of formaldehyde.

[0016]

EXAMPLES The present invention will be described below with reference to examples, but it goes without saying that the present invention is not limited to these examples. [Example 1] A phenol as a phenol, a 37% aqueous formaldehyde solution as formaldehyde, and an aqueous sodium hydroxide solution as a catalyst were each mixed with 1:
The mixture was placed in a reaction vessel at a mixing ratio of 2: 0.5 and reacted at 85 ° C. for 2 hours to obtain a resol-type phenolic resin adhesive.
Wood fibers were produced by chipping the cedar wood in accordance with the usual MDF manufacturing conditions, and the adhesive and the wood fibers were mixed so that the resin addition ratio was 15% by weight. It was set in a hot press and the MDF was hot pressed under normal MDF hot pressing conditions, resulting in a 3 mm thick, specific gravity 0.7 MD.
F was obtained.

A 40% aqueous solution of formic acid was spray-coated on the surface of the MDF so that at least the surface portion had a pH of 6.5. After plywood having a thickness of 9 mm is laminated with a vinyl acetate adhesive on the surface of the MDF opposite to the surface coated with the formic acid aqueous solution, a veneer of oak (thickness 0.3 mm) is laminated on the MDF surface with the vinyl acetate adhesive. Was applied and hot-pressed for bonding. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. The floorboard was left in an atmosphere at 40 ° C. and a relative humidity of 90% for 30 days, and no discoloration of the veneer was observed.

Comparative Example 1 An MDF having a thickness of 3 mm and a specific gravity of 0.7 was obtained in the same manner as in Example 1. 9m to this MDF
After the plywood of m was laminated with a vinyl acetate-based adhesive, a veneer of oak (thickness: 0.3 mm) was coated on the MDF surface with a vinyl acetate-based adhesive, and bonded by hot pressing. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. When this floorboard was left in an atmosphere of 40 ° C. and 90% relative humidity for 30 days, the veneer turned black.

Example 2 A 20% oxalic acid aqueous solution was applied to a P-type particle board (12 mm thick) using a resol type phenol resin as a binder.
The pH of at least the surface was adjusted to 5.5.
A vinyl acetate adhesive was applied to a veneer of oak (thickness: 0.3 mm) on the surface of the particle board to which the oxalic acid aqueous solution was applied, and was bonded by hot pressing. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. 40 of this floorboard
After standing for 30 days in an atmosphere at 90 ° C. and a relative humidity of 90%, no discoloration of the veneer was observed.

[Comparative Example 2] A veneer of oak (thickness 0.3 mm) was applied to a P-type particle board (thickness 12 mm) similar to that in Example 2 by applying a vinyl acetate-based adhesive and bonded by hot pressing. Was done. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. When this floorboard was left in an atmosphere of 40 ° C. and 90% relative humidity for 30 days, the veneer turned black.

Example 3 A phenol as a phenol, a 37% aqueous formaldehyde solution as formaldehyde, and an aqueous sodium hydroxide solution as a catalyst were used.
Each was placed in a reaction vessel at a mixing ratio of 1: 2: 0.5 and reacted at 85 ° C. for 2 hours to obtain a resol-type phenolic resin adhesive. The wood fiber was manufactured by chipping the cedar wood in accordance with the usual MDF manufacturing conditions, and the adhesive and the wood fiber were mixed so that the resin addition rate became 15% by weight. It was set on a hot press and the MDF was hot pressed under normal MDF hot pressing conditions to a thickness of 3 mm.
An MDF having a specific gravity of 0.7 was obtained.

A 40% formic acid aqueous solution was spray-coated on one surface of the MDF. After laminating a 9 mm plywood with a vinyl acetate adhesive on the surface of the MDF opposite to the surface to which the formic acid aqueous solution is applied, apply a vinyl acetate adhesive to the oak veneer (thickness 0.3 mm) on the MDF surface. Then, bonding was performed by applying heat and pressure. The pH of the veneer after hot pressing was 6.5. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. The floorboard was left in an atmosphere at 40 ° C. and a relative humidity of 90% for 30 days, and no discoloration of the veneer was observed.

Comparative Example 3 An MDF having a thickness of 3 mm and a specific gravity of 0.7 was obtained in the same manner as in Example 3. 9m to this MDF
After the plywood of m was laminated with a vinyl acetate-based adhesive, a veneer of oak (thickness: 0.3 mm) was coated on the MDF surface with a vinyl acetate-based adhesive, and bonded by hot pressing. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. When this floorboard was left in an atmosphere of 40 ° C. and 90% relative humidity for 30 days, the veneer turned black.

Example 4 A 20% aqueous oxalic acid solution was applied to a P-type particle board (12 mm thick) using a resol type phenol resin as a binder. A vinyl acetate adhesive was applied to a veneer of oak (thickness: 0.3 mm) on the surface of the particle board to which the oxalic acid aqueous solution was applied, and was bonded by hot pressing. V of veneer after hot pressing
H was 5.5. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. The floorboard was left in an atmosphere at 40 ° C. and a relative humidity of 90% for 30 days, and no discoloration of the veneer was observed.

Comparative Example 4 A veneer of oak (thickness: 0.3 mm) was applied to a P-type particle board (thickness: 12 mm) similar to that in Example 4 by applying a vinyl acetate-based adhesive, and bonded by hot pressing. Was done. Next, a urethane-based transparent paint was applied to the veneer surface to form a floor plate. When this floorboard was left in an atmosphere of 40 ° C. and 90% relative humidity for 30 days, the veneer turned black.

[0026]

According to the present invention, a veneer veneer attached to the surface of a base or a part of the base using a wood fiber board having a resol type phenolic resin as a binder. And does not cause discoloration such as blackening on surface decorative materials such as paper and decorative paper, and when used as a structural material, does not cause contamination by red extract solution resulting from water wetting, and furthermore, releases formaldehyde. A small amount of wood board can be obtained.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Hatakeyama 2-10-60 Hirabayashiminami, Suminoe-ku, Osaka-shi, Osaka F-term in Eidai Sangyo Co., Ltd. 2B250 AA05 BA03 CA11 DA04 EA02 EA13 FA21 FA28 FA31 FA33 FA37 GA03 HA01 2B260 AA05 AA06 AA10 BA01 CB01 CD03 DA04 DB01 DB14 DD02 EA05 EB02 EB06 EB11 EB19 EB21 EB42

Claims (8)

[Claims] 1. A wood board in which a surface decorative material is adhered and laminated on a wood fiber board using a resol type phenolic resin as a binder, wherein the wood fiber board and the surface decorative material are coated with an acidic substance on the laminated surface. A wood board characterized in that it is laminated in an adhesive state. 2. The wood board according to claim 1, wherein the pH of at least the surface of the wood fiber board laminated with the surface decorative material is 4.0 to 7.0. 3. The wood board according to claim 1, wherein the surface decorative material has a pH of 4.0 to 7.0. 4. The acidic substance is an organic acid such as formic acid, acetic acid, propionic acid, bromic acid, tartaric acid, succinic acid, maleic acid, or lactic acid; or an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, or nitric acid; The wood board according to any one of claims 1 to 3, wherein the wood board is any one or more of an acid salt such as aluminum sulfate and ammonium chloride. 5. When a wood board is manufactured by bonding and laminating a surface decorative material to a wood fiber board using a resol type phenolic resin as a binder, one or both of the wood fiber board and / or the surface decorative material to be a laminated surface are manufactured. A method for manufacturing a wood board, comprising bonding and laminating a wood fiber board and a surface decorative material in a state where both are coated with an acidic substance. 6. The wood fiberboard is bonded to the surface decorative material in a state where an acidic substance is applied in such an amount that the pH of at least the laminated surface of the wood fiberboard with the surface decorative material can be 4.0 to 7.0. The method for producing a wooden board according to claim 5, wherein the wooden board is laminated. 7. The pH of the surface decorative material after bonding and lamination is 4.0.
The method for producing a wood board according to claim 5, wherein the wood fiber board and the surface decorative material are bonded and laminated in a state where an acidic substance in an amount of up to 7.0 is applied. 8. The acidic substance is an organic acid such as formic acid, acetic acid, propionic acid, bromic acid, tartaric acid, succinic acid, maleic acid, lactic acid, or an inorganic acid such as hydrochloric acid, sulfuric acid, phosphoric acid, or nitric acid; The method for producing a wood board according to any one of claims 5 to 7, wherein the wood board is any one or more of an acid salt such as aluminum sulfate and ammonium chloride.