JPS5996905A - Method of degreasing wood - 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] This invention relates to a method for degreasing wood.

Generally, wood, for example, wood veneer, has been degreased by immersing the wood veneer in an alkaline solution prepared by adding a surfactant to soda ash. However, degreasing in this way causes alkali contamination, discoloration, and strength deterioration of the wood veneer, and furthermore, the water content of the degreased wood veneer increases when immersed in an alkaline solution, so degreasing There has been a problem in that it is necessary to carry out wire transfer treatment after the treatment, which lengthens the process. .

This invention was made in view of the above circumstances, and includes a step of applying microwave heating to wood, and a step of applying an aqueous solution of a base having an amino group to the resin portion of the wood that has been subjected to microwave heating. The gist of this method is a method for degreasing wood, which includes a step of heat-treating wood coated with an aqueous solution of a base having an amine group.

In other words, when removing tar by applying microwave heating to the wood grain and applying an aqueous solution of a base having an amine group to the tar part, the aqueous solution of a base having an amine group is applied to the inside of the tar part. This allows the resin to penetrate and remove tar from the inside, providing a more or less complete removal effect.

In particular, this invention does not immerse the wood in an alkaline IJ solution and degreases the wood by applying an aqueous solution of a base having an amine group only to the tar area, which prevents contamination and discoloration of the wood.

No strength deterioration occurs, and there is no need to dry after degreasing.

Furthermore, compared to conventional immersion methods, processing time can be significantly reduced.

Next, this invention will be explained in detail.

In the present invention, wood such as wood veneer is degreased, for example, in the following manner. That is, wood is irradiated with microwaves to raise the temperature to 95 to 120°C.

Microwave irradiation heats the wood from the inside, reduces internal moisture, and reduces internal pressure (when heating is stopped, the interior cools and becomes a reduced pressure state), making it easier to absorb liquid.

Immediately after completing the microwave irradiation, an aqueous solution of a base having an amine group is applied to the resin part of the wood.

In this case, the wood is in a state where it easily absorbs liquid due to microwave irradiation, so the base bathing liquid with amino groups penetrates into the interior and has a degreasing effect not only on the tar on the surface of the clothes but also on the interior. is fully demonstrated. As the base having an amino group, aliphatic primary amines such as methylamine and ethylamine, aliphatic secondary amines such as dimethylamine and diethylamine, aromatic amines such as aniline and toluidine, etc. are used, and the concentration is usually 1.0-10.
It is used as a 0% by weight aqueous solution.

After applying a water bath solution containing a base that supports amino groups, the wood is heated by steaming or microwave irradiation to raise the temperature. As a result, the degreasing effect of the aqueous solution of the base having an amine group is sufficiently achieved. As a result, the wood is completely cut out, resulting in fine-looking degreased wood.

Since this degreased wood is coated with an aqueous solution of a base having an amino group only on the resin, the moisture content is almost the same as the initial state or only slightly increased.
There is no need for drying. Then, it can be immediately subjected to the next decolorization step.

In order to degrease wood as described above, this invention
Does not cause wood contamination, discoloration, or strength deterioration due to alkali,
Furthermore, almost complete removal can be performed without requiring drying treatment after degreasing treatment. Furthermore, according to this method, the processing time can be significantly shortened compared to the conventional alkaline solution immersion method.

Next, examples will be described together with comparative examples.

EXAMPLE A Agati rotary veneer having a resin portion having a length of 120 mm, a width of 50 TIrIn, and a thickness of 1.0 mm was irradiated with microwaves at an output of 500 W for 3 minutes. Next, aqueous aniline g (concentration 5.0% by weight) was applied to the tar area of this Agatis rotary veneer, and then steamed for 10 minutes.
The test was carried out at 0°C for 30 minutes. As a result, a degreased veneer from which tar had been removed was obtained.

[Example 2] An aqueous solution of triethylamine (concentration 5.
0% by weight) was used. A degreased veneer was obtained in the same manner as in Example 1 except for the above.

[Comparative example]

An agathis rotary veneer of the same type as in Example 1 was immersed in an alkaline solution containing 1.0% by weight of soda ash and 0.1% by weight of a nonionic surfactant (Neugen ET115. Dai-Kogyo Seiyaku). The mixture was defatted by boiling at ℃ for 3 hours.

The degreased state and coloring state of the degreased veneers obtained in the above Examples and Comparative Examples were investigated and shown in the following table. From the table, it can be seen that the degreased veneer of the practical example has the same degreased state as that of the comparative example, but there is no coloring of the material at all and it is superior to that of the comparative example.

Agent: Patent Attorney Takehiko Matsumoto

Claims (3)

[Claims] (1) A step of applying microwave heating to the wood, a step of applying an aqueous solution of a base having an amino group to the resin portion of the wood that has been subjected to the microwave heating, and a step of applying an aqueous solution of a base having an amine group to the resin portion of the wood that has been subjected to the microwave heating. A method of degreasing wood that includes a process of heat-treating the wood. (2) The method for degreasing wood according to claim 1, wherein the heat treatment is microwave heating or steam heating. (3) The method for degreasing wood according to claim 1 or 2, wherein the wood is a wood veneer.