JPH054881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for producing colored wood in WPC (wood plastic combination).

[Background Art] As methods for coloring wood, methods such as chemical coloring and dyeing are already known.
However, with these methods, the coloring process takes a long time, and because the coloring process involves penetrating the wood with dyes, etc., the sapwood and heartwood parts of the wood, each raw wood, The degree of penetration of dyes etc. differs depending on the region where the wood is produced.
There is a problem in that color variations due to coloring become large.

On the other hand, in the WPC method of injecting and impregnating wood with synthetic resin and hardening it, the wood is strengthened with the synthetic resin, but by adding a coloring agent to the synthetic resin, it is possible to strengthen the wood and color it at the same time. An attempt is provided in Japanese Patent Application Laid-Open No. 55-46907. However, in WPC, synthetic resin is injected and impregnated into wood in a pressure regulating pot such as a vacuum pot, but when changing the type of colorant added to the synthetic resin, synthetic resin inside the pressure regulating pot and piping etc. If it is not removed sufficiently, the colors may mix, so in reality, only one color of colored synthetic resin can be used for each pressure adjustment pot, and the types of colors that can be colored on wood are pressure There was a problem that the number of adjustment hooks was limited.

[Object of the invention] The present invention has been made in view of the above points, and provides a colored wood that does not require construction methods such as dyeing and can be colored without being subject to color restrictions in the WPC construction method. The purpose of this invention is to provide a method for manufacturing.

[Disclosure of the Invention] The method for producing colored wood according to the present invention includes:
It is characterized by impregnating wood with a synthetic resin and semi-curing it with hot air, then applying a synthetic resin with a colorant added to the wood surface, and then curing the synthetic resin by heating and pressurizing it. The present invention will be described in detail below.

As for the wood, it is preferable to use a veneer made by slicing a hardwood with a large diameter conduit, and if such a hardwood is used, coloring that emphasizes the wood grain can be performed in the present invention as described later. First, this wood is placed in a pressure regulating pot such as a vacuum pot, and the wood is impregnated with a synthetic resin using a vacuum method or a vacuum/pressurization method. As a synthetic resin
Those commonly used for WPC, such as unsaturated polyester-styrene, methyl methacrylate, etc., can be used. After impregnating the wood with synthetic resin in this way, for example, by blowing hot air at about 120 to 130 degrees Celsius for about 10 to 20 minutes,
Semi-cured synthetic resin impregnated into wood
let

Next, a coloring is added to the same synthetic resin or a different synthetic resin used for the impregnation, and this colored synthetic resin is applied to the surface of the wood as it is or after being diluted with a diluent. Water-soluble or oil-soluble dyes and pigments can be used as the coloring agent, and the coating amount of this colored synthetic resin is 20 to 150%.
g/m ² is preferred, particularly 50 to 70 g/m ² is more preferred. Then, the wood coated with such colored synthetic resin is heated and pressed using a hot press or the like to completely harden the resin impregnated into the wood and harden the colored synthetic resin. At this time, when using a veneer as the wood and gluing this veneer to a base plate such as plywood as a veneer, attach the veneer to the surface of the base plate coated with adhesive using adhesive. By applying a colored synthetic resin to the surface of the veneer in this state, and then applying heat and pressure, the veneer can be bonded to the base plate at the same time as the synthetic resin is cured. become. The heating and pressurizing conditions vary depending on the type of synthetic resin, etc., but 140
Preferably, the temperature is about 150°C, about 10 to 11 kg/cm ² , and about 3 minutes.

For wood that has been strengthened with synthetic resin and colored with colored synthetic resin in this way,
Wood is colored by a layer of colored synthetic resin that is applied to the surface of the wood, making it possible to color the wood without color variations unlike in the case of dyeing. When the synthetic resin impregnated into the wood is semi-cured with hot air, even if the curing of the synthetic resin progresses in a foamed state and the surface becomes uneven, the colored synthetic resin is applied to the surface of the wood and further heated. Because pressure is applied, the surface of the wood can be finished smooth. In addition, in this case, the colored synthetic resin applied to the surface of the wood penetrates into the concave parts of the wood surface, especially if the wood is hardwood, into the conduit part, and the colored synthetic resin hardens while filling the conduit part. This means that it is possible to perform coloring that emphasizes the conduit pattern, that is, the wood grain.

Next, the present invention will be further explained by examples.

Example 1 A rotary veneer made of hardwood oak with a thickness of 1 mm was placed in a vacuum pot, and the vacuum was evacuated at 10 Torr for more than 1 hour. ) 2 parts by weight of the synthetic resin was poured into a vacuum pot to impregnate the veneer with the synthetic resin, and the veneer was left as it was for 4 hours. After 4 hours had elapsed, the vacuum pot was returned to normal pressure, and after being left for 1 hour, the veneer was taken out from the vacuum pot.

Place this veneer under hot air at 120-130℃ for 12 minutes,
The synthetic resin impregnated into the veneer was semi-cured. Next, this base plate is laminated on the base plate coated with adhesive, and 100 parts by weight of unsaturated polyester is applied to the surface of the veneer.
75 parts by weight of styrene monomer, 2 parts by weight of benzoyl peroxide (BPO), 2 parts by weight of Sumitomo Chemical Co., Ltd. dye (Sminol Milling Brown 3G)
Colored synthetic resin is applied in a coating amount of 50 to 60 g/ ^m2 , and immediately thereafter heated at 140 to 150°C, 10 to 11% by weight.
Heat and pressure was applied under conditions of Kg/cm ² for 3 minutes to cure the synthetic resin impregnated into the veneer and the colored synthetic resin applied to the veneer, and at the same time adhere the veneer to the base plate.

In this case, the surface of the veneer was uniformly colored, the conduit pattern was emphasized and the wood grain stood out, and the surface of the veneer was smooth.

Example 2 Mixing of colored synthetic resin with unsaturated polyester 100
parts by weight, 20 parts by weight of styrene monomer, 2 parts by weight of benzoyl peroxide (BPO), dye manufactured by Sumitomo Chemical Co., Ltd. (Sminol Milling Brown)
3G) The same procedure as in Example 1 was carried out except that the amount was set at 2 parts by weight.

In this case as well, the surface of the veneer was uniform, the conduit pattern was emphasized and the wood grain stood out, and the surface of the veneer was smooth.

Example 3 A resin containing 100 parts by weight of methyl methacrylate and 2 parts by weight of benzoyl peroxide (BPO) was used as the resin to be synthesized into the veneer, and 100 parts by weight of methyl methacrylate was used as the colored synthetic resin to be applied to the surface of the veneer. 2 parts by weight of benzoyl peroxide (BPO) and 2 parts by weight of Sumitomo Chemical Co., Ltd. dye (Oleosole Foust Brown 7R3) at a coating amount of 45 to 55 g/ ^m2.
The process was the same as in Example 1 except that the setting was made as follows.

In this case as well, the surface of the veneer was uniformly colored, the conduit pattern was emphasized and the wood grain stood out, and the surface of the veneer was smooth.

Example 4 The same synthetic resin as in Example 1 was used as the synthetic resin to be impregnated into the veneer, and the colored synthetic resins to be applied to the veneer were 100 parts by weight of methyl methacrylate, 50 parts by weight of methyl methacrylate monomer, and benzoyl peroxide (BPO). The same procedure as in Example 1 was carried out, except that 2 parts by weight and 1.5 parts by weight of a dye manufactured by Otani Dye Co., Ltd. (Bicol Stain Brown) were used.

In this case as well, the surface of the veneer was uniformly colored, the conduit pattern was emphasized and the wood grain stood out, and the surface of the veneer was smooth.

[Effects of the Invention] As described above, in the present invention, wood is impregnated with a synthetic resin and semi-cured with hot air, and then the synthetic resin with a coloring agent added is applied to the wood surface. Since the synthetic resin was cured by heat and pressure, the coloring of the wood is formed by a layer of colored synthetic resin applied to the surface of the wood, and the coloring is not the same as in the case of dyeing. It is possible to color without any variation in color, and there is no need to color the synthetic resin used to impregnate the wood, and the type of color is limited to the number of pressure adjustment pots. It's nothing. Even if the surface becomes uneven due to foaming when the synthetic resin impregnated into the wood is semi-cured with hot air, the surface of the wood is coated with colored synthetic resin and then heated and pressurized. This means that the surface can be finished smoothly, and the colored synthetic resin applied to the surface of the wood will penetrate into the conduit part on the surface of the wood, and the colored synthetic resin will harden while filling the conduit part. This allows for coloring that emphasizes the conduit pattern, that is, the wood grain.

Claims (1)

[Claims] 1. After impregnating wood with a synthetic resin and semi-curing it with hot air, the synthetic resin with a coloring agent added is applied to the wood surface, and then the synthetic resin is cured by heating and pressure. A method for producing colored wood.