JPH0651283B2 - Manufacturing method of colored wood - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing colored wood in WPC.

(Background Art) As a method for coloring wood, there are conventional methods such as chemical coloring, dyeing, steam heating treatment, etc. As a method for coloring wood impregnated with synthetic resin, synthetic resin to be impregnated and impregnated with wood is dyed, It has been a publicly known technique that a coloring agent such as a pigment is added, and then the colored synthetic resin is impregnated into wood to be colored. However, any of the above methods has the following drawbacks.

Even if the wood is colored by chemical coloring, dyeing, or steam heating, it is impossible to darken only the target pipe section that has the same natural tone and overflows with the desired natural feeling. Had.

When the synthetic resin to be impregnated is colored and treated, a shade difference occurs between the pipe section and other portions, and a colored synthetic resin-impregnated wood close to the purpose is obtained. However, when the colored synthetic resin is used for coloring, the types of the synthetic resin that can be colored are limited by the number of tanks that store the colored synthetic resin. When switching to another colored synthetic resin,
Unless the synthetic resin adhered to the inside of the vacuum vessel and the inside of the piping is sufficiently removed, colors may be mixed. That is, there is a problem in that the production of a large number of small quantities is hindered.

(Object of the Invention) Wood is heated / pressurized with steam, and a coloring liquid is used to make the whole wood a desired color.

Then, the colored wood is injected and impregnated with a synthetic resin by a conventional pressure reduction / pressurization method, and semi-cured by hot air. Then apply a colorant, remove excess colorant,
Apply clear synthetic resin, pressurize and heat cure. In this way, it is possible to easily obtain a colored resin-impregnated colored wood in which the wood pipe (particularly a hardwood) has a dark color and the grain portion is emphasized.

It does not color the wood and leaves it in the bare color (uncolored),
A synthetic resin is injected and impregnated by a conventional pressure reduction / pressurization method, and semi-cured by hot air. Next, a colorant is applied, and after removing the excess colorant, a clear synthetic resin is applied, pressed, and cured by heating.

In this way, it is possible to easily obtain a colored resin-impregnated colored wood in which the wood pipe (particularly a hardwood) has a dark color and the grain portion is emphasized.

(Disclosure of the Invention) The manufacturing method of the present invention will be described below along with its steps.

For wood, the diameter of the conduit is large. Hardwood logs are processed into veneer by rotary race, harf rotor Lee race, slicer, saw, etc. The thickness of the veneer is 0.
It is about 2 to 10 mm. However, when it is used for surface makeup of a general flooring material, it is preferably about 0.3 to 3 mm.

Then, this veneer is put into a processing pot as it is as raw material or after being dried, and steam is supplied to the inside of the treatment pot to make it 110-160.
℃, pressure of about 1.5 ~ 6.0kg / cm ^{2 for} about 10 minutes to 3 hours,
Heat / pressurize.

Next, a coloring liquid is applied to the single plate, or the single plate is immersed in the coloring liquid to perform a coloring treatment. Then, after the coloring treatment is completed, the colored veneer is dried so that the veneer has a water content of 10% or less. The dried veneer is put in a vacuum / pressurization kettle, and the vacuum / pressurization method, which is a conventionally known method,
A synthetic resin such as unsaturated polyester or methyl methacrylate is injected and impregnated into a single plate. After the impregnation, after removing the synthetic resin adhering to the surface of the veneer, once with hot air,
Make semi-cured.

Then, the semi-cured veneer is placed on the base plate to which the adhesive is applied in advance, and is attached to the base plate plywood by thermocompression molding. After the molding is completed, a colorant (dye, pigment, etc.) is further applied to the surface of the veneer and dried, and an excess colorant (a portion other than the conduit portion) is removed by polishing, brushing or the like.

Further, a colorless synthetic resin (the same synthetic resin as that used for the impregnation is preferable, but a different synthetic resin may be used) is applied to the surface of the single plate, and is heat-pressure cured. The distribution ratio of the synthetic resin is similar to that at the time of impregnation, or it is preferable to use the synthetic resin having a slightly diluted (lower viscosity) compounding ratio. By this thermocompression molding, the synthetic resin applied to the surface of the single plate is cured.

Next, if necessary, the surface of the veneer may be polished, finished by painting or the like to obtain a synthetic resin-impregnated colored wood. The coloring agent may be applied to a semi-cured veneer, and the veneer may be placed on a base plywood coated with an adhesive and subjected to thermocompression molding.

Alternatively, the hardwood veneer may be dried, the synthetic resin may be injected and cured without coloring, and the colored wood may be manufactured according to the above steps.

Hereinafter, detailed description will be made based on specific examples.

Example 1) 1 mm thick rotary processed veneer of hardwood oak having a water content of 50%
With the above raw veneer as it is, put it in a steam treatment pot with a spacer between it and 130 to 140 ° C, 2.8 to 3.7 kg / c depending on the steam.
The veneer was colored by heat and pressure treatment under conditions of m ² and 30 minutes.
Further dyeing solution (Suminor Milling Brown 3G 2.
0 parts by weight, PEGMA 30 parts by weight, water 70 parts by weight)
Apply 120g / m ² (both sides). This is dyed for 2 hours by a steam heating dyeing method. After the treatment is completed, it is dried until the water content becomes 6% or less.

Then, the dried colored veneer was placed in a vacuum oven and evacuated at 10 torr or less for 1 hour or more, then 100 parts by weight of unsaturated polyester, 20 parts by weight of styrene monomer, and BP.
A synthetic resin prepared by blending O2 parts by weight was poured into a vacuum vessel, left for 30 minutes in a reduced pressure state, then returned to normal pressure, and the single plate was dipped in the synthetic resin for 4 hours or more to impregnate it. The veneer was taken out of the kettle, the synthetic resin adhering to the surface of the veneer was removed, and then the veneer was placed in a hot air dryer at 120 to 130 ° C. for 15 to 20 minutes to semi-cure the synthetic resin.

Then, this single plate is placed on a base plate coated with an adhesive, and the condition is 140 to 150 ° C. and a surface pressure of 10 to 11 kg / cm ² for 5 minutes.
Hot pressing was performed to integrate the base plate plywood and the semi-cured veneer. On the surface of this veneer, Pollux Brown PM-
A coloring liquid prepared by mixing 5 parts by weight of 3BR (manufactured by Sumika Color Co., Ltd.) and 100 parts by weight of water was applied by a reverse roll coater at an application amount of 50 to 60 g / m ² and dried.
After that, the surface of the veneer was polished to remove the colorant other than the tube portion of the veneer. Furthermore, the above-mentioned synthetic resin (the synthetic resin used for impregnation of the veneer) was applied to the veneer surface at a coating amount of 50 to 60 g / m ² , and immediately 140 to 150 ° C. and a surface pressure of 10 to 11 kg / cm ² Three
Thermocompression molding was performed under the condition of minutes, the synthetic resin on the surface of the veneer was hardened to form a clear overcoat layer, and then surface polishing, coating, and actual processing were performed to obtain a building floor product.

Example 2) In the same manner as in Example 1), heat and pressure treatment is performed for coloring, steam dyeing is further performed with a dyeing solution, and a single plate is impregnated with a synthetic resin and semi-cured.

The same coloring liquid as in Example 1) is applied to the surface of this semi-cured veneer by a reverse roll coater at an application amount of 50 to 60 g / m ² . Then, on the base plate plywood coated with adhesive,
This veneer is placed, and thermocompression molding is performed for 5 minutes under the conditions of 140 to 150 ° C. and a surface pressure of 10 to 11 kg / cm ² , and the veneer is integrated with the base plate. After that, the surface of the veneer is polished to remove the excess colorant other than the conduit portion.

Furthermore, the same synthetic resin as that used for injection impregnation was applied to the veneer on the veneer surface at a coating amount of 50 to 60 g / m ² , and immediately 14
Under the conditions of 0 to 150 ° C. and a surface pressure of 10 to 11 kg / cm ² , for 3 minutes, thermocompression molding is performed to cure the synthetic resin on the surface of the veneer to form a clear overcoat layer. The following is the same as in Example 1).

Example 3) As a veneer, a rotary-processed oak having a thickness of 0.5 mm and having a water content of 10 to 15% is used. Other conditions and steps were the same as in Example 1).

Example 4) As a veneer, a rotary-processed veneer having a thickness of 0.5 mm obtained by rotary-working oak and having a veneer water content of 50% or more is used.

This was steam-pressurized under the conditions of 130 to 140 ° C., 2.8 to 3.7 kg / cm ² , and 15 minutes to color the veneer. As a dyeing solution, 2 parts by weight of Suminol Milling Brown 3G, P
Using 10 parts by weight of M-Brown, 25 parts by weight of PEGMA, and 75 parts by weight of water, a coating amount of 70 to 80 g / m ² (on both sides) is applied with a sponge roll coater, and a steam heating dyeing method is used.
Dye for 2 hours. After the treatment is finished, it is dried until the water content becomes 6% or less.

The following is the same as in Example 1).

Example 5) As a veneer, a veneer rotary-processed with a thickness of 1.0 mm and a veneer having a water content of 10% or less is used.

This veneer is placed in a vacuum oven, and synthetic resin is injected and impregnated in the same manner as in Example 1) to semi-cure the synthetic resin.

Adhesive to the base plate plywood, stain (Suminol Milling Brown 3G, 5% aqueous solution) is applied to the surface of the veneer with a reverse roll coater at 60 to 70 g / m ² and dried, and the colorant other than the duct is polished. Remove.

Furthermore, the synthetic resin used for injection and impregnation is applied to the surface of the veneer and cured by heat and pressure. (Similar to Example 1) After that, polishing and painting were performed to obtain a building floor product.

(Effects of the Invention) Since the method for producing colored wood of the present invention is configured as described above, it has the following unique effects.

Since the colorant is embedded in the conduit portion, it is possible to easily obtain a synthetic resin-impregnated colored wood having a different color tone from the conduit portion and having an emphasized wood grain portion.

Synthetic resin-impregnated colored wood of various colors can be obtained simply by changing the colorant applied to the surface of the veneer.

Since no colorant is added to the impregnated synthetic resin, it can be produced with a minimum of synthetic resin storage tank.

Synthetic resin is applied and cured, so when semi-curing,
The unevenness caused by foaming and hardening of the resin adhering to the surface of the veneer and the unevenness of the conduit portion are reduced.

Claims (2)

[Claims] 1. Wood is colored by heating and pressure treatment with steam,
Then, the wood is colored with a coloring liquid to be further colored. After this, inject and cure synthetic resin into the wood,
Apply the colorant to the wood surface and remove the excess colorant. Furthermore, a method for producing colored wood, characterized in that a clear synthetic resin is applied and cured on the surface of the wood. 2. A synthetic resin is injected into wood and cured. A coloring agent is applied to the surface of the wood to remove excess coloring agent. Furthermore, apply clear synthetic resin to the wood surface.
The method for producing colored wood according to claim 1, wherein the colored wood is cured.