JPH05309323A - Production of wooden material prevented from discoloration due to ultraviolet rays - Google Patents

Abstract

PURPOSE:To prevent the discoloration of a wooden material due to ultraviolet rays by easily impregnating the wooden material with a water-soluble surfactant only by coating and to eliminate the necessity of the recovery of a solvent and the possibility of the volatilization of the solvent by coating and impregnating the surface of the wooden material with the water-soluble surfactant having ultraviolet absorbing capacity. CONSTITUTION:A wooden material prevented from discoloration due to ultraviolet rays is produced by coating and impregnating the surface of the wooden material with a surfactant having ultraviolet absorbing capacity. As the surfactant having ultraviolet absorbing capacity, there is a polyoxyethylene alkyl ether such as polyoxyethylene lauryl ether or polyoxyethylene nonyl ether. Since the surfactant having ultraviolet absorbing capacity is easily infiltrated in the wooden material, even veneer produced by grinding the surface of the impregnated wooden material by a sanding device or a planer or applying the wooden material to a slicer has the same effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a wood material, the surface of which is not discolored when exposed to ultraviolet rays.

[0002]

2. Description of the Related Art It is known to use an ultraviolet absorber for preventing discoloration of the surface of a wood material, but the ultraviolet absorber conventionally used cannot be used as a water-soluble one because it is oil-soluble. Although it may be emulsified and dispersed to make it water-soluble and used, it is possible to apply the emulsified and dispersed ultraviolet absorber to the surface of the wood material, but it was difficult to impregnate the wood material. The discoloration preventing effect of the ultraviolet absorber is not sufficient just by applying it to the surface of the wood material, and it was necessary to impregnate part of the surface with the ultraviolet absorber.

As water-soluble ultraviolet absorbers, semicarbazide, polyethylene glycol and the like are known, but even if they are applied to the surface of wood, the discoloration preventing effect is insufficient.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent discoloration of a wood material by impregnating the surface of the wood material with an ultraviolet absorber applied to the surface of the wood material.

[0005]

The present invention relates to a method for producing a wood material which prevents discoloration due to ultraviolet rays, which comprises coating and impregnating a surface of the wood material with a surfactant having an ultraviolet absorbing ability, and a wood material. The present invention relates to a method for producing a wood-based material which prevents discoloration due to ultraviolet rays, which is characterized by coating and impregnating a surface-active agent having an ultraviolet-curing function, which will be described in detail below.

In the present invention, the term "wood material" includes single plates such as sawn wood, laminated wood, plywood, particle board, MDF and name wood veneer, as well as composite wood such as name wood veneer laminated plywood. ..

Further, as the surfactant having an ultraviolet absorbing ability, there are polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether and polyoxyethylene nonyl ether. Further, as the surfactant having an ultraviolet curing function, fatty acid metal salts such as sodium salt of 10-undecenoic acid and sodium salt of 8-nonenoic acid,
Examples thereof include polyoxyalkyl phenyl ethers such as polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, and polyoxide decyl phenyl ether. The above-mentioned metal salts of fatty acids and polyoxyalkylphenyl ethers also have an ultraviolet absorbing ability.

It is also possible to react the oil-based ultraviolet absorber with polyethylene glycol or the like to make it water-soluble before use.

In the present invention, since the surface active agent having the ability to absorb ultraviolet rays is easily impregnated in the wood material, the surface of the impregnated wood material is ground by a sanding device or a planer, or a simple slicer is used for the production. A plate will have the same effect.

Example 1 A 3% aqueous solution of polyoxyethylene nonylphenyl ether was applied and impregnated on the surface of a 15 mm thick oak wood at a rate of 55 g / m ² and dried.

Example 2 A 1% aqueous solution of 10-undecenoic acid sodium salt was applied to the surface of oak veneer decorative plywood 8 times.
The coating was impregnated at a rate of 0 g / m ² and dried. Then, the surface was sanded to apply a transparent aminoalkyd resin coating material at 50 g / m ^{2 and} dried at 80 to 100 ° C. for 2 hours.

(Example 3) Polyoxyethylene alkyl ether type nonionic surfactant (manufactured by Nika Kagaku Co., Ltd.)
A 3% aqueous solution of trade name Sunmol BK-57) was applied to a 3 mm thick oak veneer at a rate of 70 g / m ² and dried.

(Example 4) A plurality of oak materials produced in Example 1 were joined together with an adhesive to form a flitch, and the flitch was sliced to produce a 0.6 mm thick oak veneer. After adhering this oak veneer to the plywood surface, sand the surface and apply 80g / g of transparent polyurethane resin paint.
m ^{2 was} applied and dried at 100 to 120 ° C. for 3 hours to obtain oak veneer flash decorative plywood.

(Comparative Example 1) A 5% aqueous emulsion of a benzotriazole type ultraviolet absorber was applied to the surface of a veneer-coated veneer at a rate of 80 g / m ² and dried.

(Comparative Example 2) A 5% aqueous emulsion of a benzophenone-based ultraviolet absorber was applied to the surface of a veneer-coated veneer at a rate of 80 g / m ² and dried.

(Comparative Example 3) A 5% aqueous solution of semicarbazide was applied on the surface of a veneered veneer-coated veneer at 80 g / m ² and dried.

Fed wood materials produced according to Examples 1 to 4 and Comparative Examples 1 to 3 and wood materials whose surface is not treated.
When ultraviolet rays were irradiated for 72 hours using a meter,
The surfaces of the wood materials of Examples 1 to 4 were scarcely discolored, but the surfaces of the wood materials of Comparative Example 1 and Comparative Example 2 were slightly discolored. Further, the wood material of Comparative Example 3 and the surface of the untreated veneer-coated veneer had a large degree of discoloration.

[0017]

EFFECTS OF THE INVENTION Since a surfactant having an ultraviolet absorbing ability or a surfactant having an ultraviolet curing function is used, when it is used as an aqueous solution, it can be easily impregnated into a wood material only by applying it on the surface. It is possible to prevent discoloration of wood materials due to ultraviolet rays. Further, unlike the oil-based ultraviolet absorber, the surfactant used in the present invention has no need for solvent recovery or volatilization of solvent.

Claims (2)

[Claims] 1. A method for producing a wood material which prevents discoloration due to ultraviolet rays, which comprises coating and impregnating a surface of the wood material with a surfactant having an ultraviolet absorbing ability. 2. A method for producing a wood material which prevents discoloration due to ultraviolet rays, which comprises coating and impregnating a surface of the wood material with a surfactant having an ultraviolet curing function.