JPS61295005A - Manufacture of colored decorative veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing colored decorative veneers used for flooring, walling, etc.

[Background technology]

BACKGROUND ART Conventionally, hardwood ring-hole materials such as oak have been widely used for decorative veneers used for flooring and wall materials. At that time, it has been proposed to color the decorative veneer in order to make it more beautiful, but with ordinary pigments and dyes, it is possible to color the decorative veneer without unevenness and with a rich natural feel. I couldn't do that.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing a naturally colored decorative veneer in which the inside of the decorative veneer is colored and has no color unevenness without impairing its natural appearance.

[Disclosure of the invention]

The method for producing a colored decorative veneer of the present invention includes impregnating a thin wood board with an oxidation-reactive coloring agent, and then promoting the reaction between the oxidation-reactive colorant and the chromosomes in the wood thinner board by heating vapor deposition.
It is characterized by coloring thin wood boards.

As described above, according to the present invention, the oxidation-reactive coloring agent that reacts with the chromosomes in the wood lamina is impregnated into the wood lamina, and the coloring agent reacts with the chromosomes. The oxidation-reactive coloring agent penetrates well into the interior of the thin wood board, so it is possible to color the inside of the thin wood board regardless of its thickness. Also, what about oxidation-reactive colorants? +
Due to the M property, it is possible to reduce variations in color between the thin wood boards, which are mainly caused by differences between the core material and the sap material.

Furthermore, since the oxidation-reactive colorant reacts with chromosomes to develop color and is then heated and steamed, it has excellent color fastness.

Examples of the thin wood board include rotary or sliced veneer made of ring-hole wood such as oak, and the thickness is 0.
．． A suitable length is about 2 to 1Q mm, more preferably about 0.2 to 0.3 m.

Examples of the oxidation-reactive colorant include amine colorants such as p-phenylenediamine, alum, and the like. These oxidation-reactive colorants have a concentration of 0.01
It is used in the form of a ~3% aqueous solution, and a thin wooden board is immersed in this aqueous solution to allow the oxidation-reactive colorant to penetrate into the inside of the thin wood board.

Thereby, the chromosomes within the wood lamina are oxidized by the oxidation-reactive colorant. Appropriate immersion time is about 12 hours at room temperature and about 2 hours when heated.

After the oxidized thin wood board is removed from the liquid and drained, the reaction between the chromosomes in the wood thin board and the oxidation-reactive coloring agent is promoted by heating and steaming. As a result, the wood veneer takes on a reddish color similar to that of carbonized wood. Steaming is carried out at a temperature of 140-150°C and a steam pressure of 3.6-4. kg
/C+J for about 5 to 20 minutes, and the longer the steaming time, the less red the red color will change to a brown color.

The heated and steamed wood thin board is dried with hot air or high frequency, and if necessary, subjected to WPC treatment.

It is preferable to use high frequency for drying in order to prevent the veneer from cracking or curling. In the WPC treatment, for example, a synthetic resin such as polyester resin, acrylic resin, or phenol resin is injected into the interior of a thin wooden board using a vacuum pressurization method and solidified. Thereby, the mechanical strength and durability of the decorative veneer obtained can be improved.

As described above, according to the method of the present invention, a colored decorative veneer with excellent color fastness without color unevenness can be obtained without impairing the natural appearance of the thin wood board.

Color fastness can be imparted by chemical color development followed by heating and steaming.

Next, the present invention will be explained in detail by giving examples.

Example: [Oxidation-reactive colorant impregnation treatment process] A thin wood board (rotary veneer) with a thickness of 1.0fi, which is oak wood (ring-pore material), is coated with a density of 0.02 in an undried state.
5% p-phenylenediamine aqueous solution with a liquid temperature of 60°C.
Soaked for an hour. Spacers were interposed between the soaked wooden thin plates. After soaking, the thin wood board was drained for 30 minutes.

[Heating and steaming process]

After impregnating the oxidation-reactive colorant, the wood laminate is heated to a temperature of 140-1
It was steamed for 8.0 minutes at 45° C. and a steam pressure of 3.6 to 4.0 kg/c. After steaming, showering was performed for 10 minutes to prevent cracking of the wood lamina and to remove the oxidation-reactive colorant. Then, hot air drying was performed at a temperature of 140° C. for 15 minutes.

After the cwpc treatment process, polyester resin (100 parts of resin, 2 parts of BP0, 20 parts of styrene monomer) was added to 6. It was impregnated into a thin wood board under a reduced pressure of Qmlg. Impregnation was carried out for 12 hours. After impregnating with resin, the thin wood board was taken out, drained, and then immersed in a tank of styrene monomer for 30 minutes to remove the holes (
(Ring hole) Extract and remove the resin on the surface. The thin wood board was then dried with hot air at a temperature of 120° C. for 12 minutes to semi-cure the resin.

[Finishing process]

A thin wooden board treated with WPC was cut into a predetermined size using a guillotine and a saw blade, and two places on the adhesive surface to the plywood were taped with nonwoven fabric. Next, this was set on plywood whose surface was coated with adhesive. After that, a colored overcoat liquid was applied uniformly (coating amount: 5 g/2 (54,
4g/r/)). The overcoat liquid was made by adding a coloring agent (Pigment Mapico) at a rate of 5% to the same resin composition as used in the above-mentioned WPC treatment. After applying Overcoal 1, the wooden thin board was heated at a temperature of 145°C and a pressure of 10.0 kg/d.
The overcoat liquid was pressurized and infiltrated into the holes of the thin wooden board by pressing for 5 minutes to color the holes. Then,
After tongue processing was carried out in the usual manner and the surface was sanded, an undercoat was applied with an acrylic polyester ultraviolet ray coating, and a topcoat was applied with a urethane coating (flow coater, hot air drying).

The thus obtained colored decorative veneer had a natural coloring that was uniformly applied to the inside, and also had excellent color fastness.

〔Effect of the invention〕

According to this invention, an oxidation-reactive coloring agent that reacts with the chromosomes in the wood lamina is impregnated into the wood lamina, and the oxidation-reactive coloring agent reacts with the chromosomes to cause coloring. penetrates well into the interior of the thin wood board, so it is possible to color the inside of the thin wood board regardless of its thickness. Furthermore, due to the permeability of the oxidation-reactive colorant, color variations between the wood laminates, which are mainly caused by differences between the core material and the sapwood, can be reduced. Furthermore, since the oxidation-reactive colorant is heated and steamed after reacting with chromosomes to develop color, it has the advantage of excellent color fastness.

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Claims (1)

[Claims] A colored decorative veneer characterized in that the thin wood board is impregnated with an oxidation-reactive colorant, and then the reaction between the oxidation-reactive colorant and the chromosomes in the wood thin board is promoted by heating vapor deposition to color the wood thin board. Production method.