JPH01110902A - Method of impregnating and treating wood - Google Patents

Abstract

PURPOSE: To simply and cheaply provide a reformed wood with a surface excellent in various properties by pressurizing either of two wood reforming agents forming insoluble compound which reciprocally reacts and impregnating the selected reforming agent in wood. CONSTITUTION: Two types of wood reforming agents are of inorganic liquid, one of which generates cation ions such as Mg, Ca, Al, Zn, Ba, etc., in an aqueous solution and the other generates anion ions such as sulfate ion, phosphoric acid ion, carbonic acid ion, etc., in an aqueous solution. The reforming agents are pressurized and impregnated in wood in the form of aqueous solution. Impregnating wood is conducted by either of the three methods below: Both reforming agents are pressurized and impregnated; The reforming agent only to be first impregnated is pressurized and impregnated, and the second reforming agent is decompressed and impregnated or impregnated under an atmospheric condition; The first reforming agent is decompressed and impregnated or said agent is impregnated under an atmospheric condition, or the second reforming agent is pressurized and impregnated; It is particularly preferable that pressurizing and impregnating only one reforming agent in terms of improving the impregnation uniformity and various properties on the wood surface.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for impregnating wood such as wood veneer.

[Background Art] Wood has drawbacks such as rotting, burning, and warping, and furthermore, when used as flooring materials, it is soft and has poor scratch resistance.

In order to eliminate these drawbacks, WPC treatment, which impregnates synthetic resin into wood, has been conventionally performed. However, in WP'C treatment, when the resin impregnation rate is increased,
Although various physical properties such as hardness were improved, the surface had a so-called wet color and the woody feel was impaired.

Therefore, it has been proposed to impregnate wood with an aqueous solution of two types of inorganic salts and react in the wood to generate an insoluble inorganic compound to modify the wood. Such inorganic treatment has the advantage that the wood does not become wet colored even if it is impregnated with a large amount of inorganic salt.

However, in order to obtain the desired physical properties (preservation, flame retardancy, hardness, etc.) through inorganic treatment, it is necessary to impregnate a large amount of inorganic salt, but it is difficult to uniformly impregnate a large amount of inorganic salt. Moreover, impregnating a large amount of the inorganic salt increases the consumption of the inorganic salt, resulting in an increase in production cost.

[Purpose of the invention]

An object of the present invention is to provide a method for impregnating wood that can easily and inexpensively obtain modified wood having a surface with excellent physical properties.

[Disclosure of the invention]

The wood impregnation treatment method of the present invention involves impregnating into wood by pressurizing at least one of two types of wood modifiers that react with each other to form an insoluble compound.

In this way, since the wood modifier is impregnated under pressure, a large amount of the modifier is impregnated, especially on the surface side of the wood, and properties such as surface hardness, antiseptic properties, and flame retardance of the wood are improved. Furthermore, since the impregnation is carried out under pressure, the treatment can be carried out in a short time.

The two types of wood modifiers are each an inorganic liquid, and one of them contains Mg, Ca, AI, Zn,
One generates cation ions such as Ba, and the other generates anion ions such as sulfate ions, phosphate ions, carbonate ions, etc. in an aqueous solution. These modifiers are impregnated into wood in the form of an aqueous solution, and upon drying produce inorganic compounds that are insoluble in the wood. The order of impregnation of the two types of modifiers is not particularly limited.

The modes of impregnation treatment in this invention include: (1) impregnating both modifiers under pressure; (2) impregnating only the first modifier with pressure, and impregnating the second modifier with reduced pressure or regular impregnation. There are three methods: pressure immersion; (2) the first modifier is impregnated under reduced pressure or normal pressure; and the second modifier is impregnated under pressure. Of these, the above ■
Pressure impregnation with only the second modifier as shown above is particularly preferred in order to further improve the uniformity of impregnation and the physical properties of the wood surface.

In the vacuum impregnation process, the wood is first placed in a vacuum pot, and the inside of the pot is
After reducing the pressure to 0 mmHg or less, a modifier is injected, and then the pressure is returned to normal pressure for immersion treatment, and further pressurization is applied as necessary. Also, normal pressure immersion involves immersing wood in a solution of a modifier.

After the impregnation treatment with both modifiers, the treated wood is dried so that these modifiers react in the wood to form insoluble inorganic compounds.

Next, the method for impregnating wood according to the present invention will be explained with reference to Examples.

Example 1: A Japanese pine veneer (thickness 15+wm) was heated under reduced pressure (1
Then, the first modifier solution in which 4.2 kg of barium chloride and 1.2 kg of boric acid were dissolved was injected and impregnated.

After impregnation, 10 kg of ammonium hydrogen phosphate, 3.
The wood was immersed in a second modifier solution in which 7 kg was dissolved, and the wood was immersed at a rate of 15 to 20 kg/cJ'? ! Impregnation was carried out under pressure for over 1 hour.

After pressure impregnation, the wood was washed with water for 24 hours, dried at 40°C, and the surface was painted to obtain modified wood.

Example 2: A second modification was carried out in the same manner as in Example 1, except that a Japanese pine veneer (thickness 1OIII11) was saturated with water and then immersed in the first modifier solution at 60°C for 24 hours. The material was impregnated with the wood quality agent solution under pressure, washed with water, and dried to obtain modified wood.

Example 3: After reversing the impregnation order of the first modifier and the second modifier and impregnating the second modifier under reduced pressure,
Modified wood was obtained in the same manner as in Example 1, except that the first modifier was impregnated under pressure.

The modified wood obtained in these Examples all had their surfaces impregnated with a large amount of inorganic salt, and had excellent physical properties such as surface hardness, antiseptic properties, and flame retardancy.

〔Effect of the invention〕

According to this invention, since the wood modifier is impregnated under pressure, a large amount of the modifier is impregnated particularly on the surface side of the wood, improving properties such as surface hardness, antiseptic properties, and flame retardance of the wood. . Furthermore, since the impregnation is carried out under pressure, the treatment can be carried out in a short time.

Claims (2)

[Claims] (1) A wood impregnation treatment method in which two types of wood modifiers that react with each other to form an insoluble compound are separately impregnated into wood, wherein at least one of the two types of wood modifiers is modified. A method for impregnating wood, characterized by impregnating the agent into the wood under pressure. (2) The method for impregnating wood according to claim (1), wherein only the second modifier of the two types of wood modifiers is impregnated under pressure.