JP2599639B2 - Wood treatment liquid impregnation method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of impregnating wood with a treatment liquid, and more particularly to wood which reversibly occurs when the water content of swollen wood is boiled in the wood structure. The present invention relates to a new method capable of efficiently impregnating a wood with a desired treatment liquid by skillfully utilizing the elasticity phenomenon of wood and the phenomenon of irreversible water permeability of wood.

[Conventional technology and technical issues to be solved]

Conventionally, treatment liquids (eg, dyes, preservatives,
Examples of the method of impregnating a termitic agent and other modifying agents) are: i. A dipping method in which wood is immersed in a treatment liquid to impregnate it; ii. A boiling method in which wood is impregnated by boiling the treatment liquid. Iii. Pressure injection method (press-in method) in which treatment liquid is applied to wood to apply pressure to infiltrate and impregnate it. However, both of the former immersion method and the boiling method are difficult to dispose of because a large amount of waste liquid is generated, and the former immersion method can be realized by applying ultrasonic vibration recently. Although the impregnation rate has been increased, it takes a very long time to complete the impregnation process, which is problematic in terms of production efficiency.In addition, in the latter boiling method, a large amount of treatment liquid and wood are used. In addition to the high fuel efficiency required for boiling, the treatment time is considerably required, and it is difficult to say that the production cost and efficiency are not sufficient. Although the treatment liquid has a better penetration rate than the boiling method, it requires special factory equipment and, depending on the type of wood, may have a dense xylem structure and may not be press-fitted. In fact, an inexpensive impregnation method has been demanded.

The present invention has been made in view of the fact that the conventional method of impregnating wood with a treatment liquid was in the above-described situation, and asked the desired processing liquid to wood for the density of the structure and the shape of the lumber. It is an object of the present invention to provide a new method capable of efficiently impregnating without impregnation.

Another technical object of the present invention is to provide a method for impregnating wood with a processing solution capable of uniformly impregnating a desired processing solution into the wood tissue.

Still another object of the present invention is to provide an efficient method capable of producing an insoluble and non-combustible inorganic compound in cells constituting a wood tissue to make the wood flame-retardant.

[Means adopted to solve the problem]

Means adopted by the present inventors to solve the above technical problems include: (a) swelling wood by adding moisture to the wood, and heating the swollen wood as a whole to boil the moisture content. By softening the wood into an elastic and flexible state, and opening the cell wall holes constituting the wood tissue,
Processing means for imparting water permeability; and (b) forced absorption means for suctioning and impregnating the wood structure with the processing liquid by pressurizing and compressing the elastic and flexible wood to restore the volume in the processing liquid. And are applied sequentially.

That is, according to the present invention, when the wood is sufficiently hydrated and the water content is heated and boiled, the xylem tissue is temporarily changed (while heating) to a flexible elasticity, and the cell wall of the xylem tissue is changed. It focuses on the phenomenon in which the torus that blocks the hole breaks and the wood itself changes to water permeable, utilizing the property that wood reversibly becomes flexible and elastic due to boiling of moisture. The gist of the idea is that the target wood is compressed and the permeated compressed wood is restored in shape and volume in the required processing liquid, thereby allowing the processing liquid to be sucked and impregnated into the wood tissue. It exists.

The wood to be covered by the present invention is preferably subjected to a peeling treatment, but it may be a raw wood (raw wood), a post-milled pillar, a board, a long wood, or a chip obtained by cutting the wood into small pieces. Wood products may be used.

In addition, as a treatment liquid for impregnating wood, a preservative treatment liquid containing a preservative, a termite treatment liquid containing an effective insecticide for termites, a cockroach repellent treatment liquid containing an effective insecticide for cockroaches, dyes and the like Various types of processing liquids used for processing, modifying, coloring, or decoloring wood, such as a dyeing liquid containing a disperse dye and a flame retarding processing liquid containing an agent for making wood flame retardant, can be adopted.

Hereinafter, the present invention will be described more specifically with reference to examples.

Example A cypress heartwood (air-dry specific gravity: 0.44, average annual ring width: 2.2 mm) cut to a size of 5 cm in the fiber direction, 5 cm in the radial direction, and 10 cm in the tangential direction was swollen to a saturated state, (Hitachi Home Appliances: power consumption: 1.15 kW, rated high-frequency output: 600 W), when exposed to microwaves at 2450 MHz for 10 minutes, the moisture content of the hinoki wood boiled and spouted out from the annual rings.
The temperature of the boiling water was 98 ° C.

Next, the cypress wood whose moisture content was boiled was taken out of the microwave oven and pressed radially at 10 to 15 kg / cm ² , and the cypress wood was compressed by 70% in the radial direction.

Therefore, the compressed hinoki cypress wood was cut in half in the cross direction of the fiber, and one was immersed in a 3% JIS K 1550 inorganic fluoride wood preservative solution (50 ° C.) for one hour to swell and restore the volume. After drying to about 15% moisture content,
An antiseptic hinoki material in which the preservative was uniformly impregnated in the wood tissue was obtained.

The other compressed cypress wood is immersed in an aqueous solution (50 ° C.) of 1% by weight of a termitic emulsifier containing pyridafenthion (organophosphorus pesticide) as an active ingredient for 2 hours to swell to restore the volume, and then to contain water. As a result of drying to a rate of about 15%, an ant cypress material in which the termiticide was uniformly dispersed and impregnated in the wood structure was obtained.

In order to check the degree of hinoki cypress elasticity due to microwave heating, an equivalent hinoki swelling material swollen to a saturated state was radially 10 to 15 kg / cm ² similarly to the above example.
, The mechanical properties of the comparative cypress wood changed, leading to wood destruction.

Example The cedar heartwood (air-dry specific gravity: 0.32, average annual ring width: 3.8 mm) cut to a size of 5 cm in the fiber direction, 5 cm in the radial direction, and 10 cm in the tangential direction was swollen to a saturated state, (Hitachi Home Appliances: power consumption: 1.15 kW, rated high-frequency output: 600 W), when exposed to microwaves of 2450 MHz for 7 minutes, the moisture content of the hinoki wood boiled and spouted out from the annual rings. The temperature of the boiling water was 98 ° C. The cedar wood was taken out of the microwave oven and pressed in the radial direction at 10 to 15 kg / cm ² in the same manner as the cypress wood of the example. As a result, the cedar wood was compressed by 78% in the radial direction.

Therefore, the compressed cedar material was immersed in a saturated aqueous solution of magnesium chloride (60 ° C.), which is a cationic compound, for 30 minutes to restore its volume to about 50%. The original volume was recovered by immersion in a mixed saturated aqueous solution (60 ° C.) of the compound triammonium phosphate and sodium metaborate for 30 minutes, and this was dried to a water content of about 15%. Insoluble and non-flammable inorganic compounds formed by the reaction of magnesium chloride, ammonium tertiary phosphate and sodium metaborate were uniformly coagulated in the voids of wood, such as fiber pores, vessels, and tracheids constituting Flame-retardant cedar wood was obtained.

In order to check the degree of elasticity of the cedar wood by microwave heating, an equivalent cedar wood swelled in a saturated state, as it was, was 10 to 15 kg / cm ^{2 in the} radial direction with the cedar wood of the above embodiment.
However, the comparative cedar wood changed its mechanical properties and led to wood destruction.

Although the embodiments disclosed in the present specification are generally as described above, the present invention is not limited to the above-described embodiments and various modifications are possible within the scope of the claims. Needless to say, there is.

That is, although the microwave irradiation method was employed as a heating means for boiling the moisture content of the swollen wood in the above-described examples and the present invention, it was also possible to boil the moisture content by heating in hot water, and to give the swollen wood with high-temperature steam. It is also possible to boil the water content by irradiating far infrared rays.

Further, in the above Examples and Examples, only examples of impregnation with a preservative treatment liquid, a termite treatment liquid, and a flame retardant treatment liquid are shown, but instead of these treatment liquids, a dyeing liquid or a decolorizing treatment liquid, and further, Naturally, it is also possible to process wood by impregnating with a material improving agent (for example, a low-concentration synthetic resin solution, polyethylene glycol) or the like.

(Effect of the present invention)

As described above with reference to the examples, in the method of the present invention, wood is sufficiently hydrated, and the hydrated tissue is heated and boiled to change the xylem tissue to a flexible elasticity. Breaking the torus that occludes the torsion, transforms the wood itself into permeable, compresses the wood that has been softened by the boiling of moisture, and then compresses the permeable compressed wood to the required level. Extremely dense wood with a xylem structure that could not be permeated by the conventional pressure injection method because the shape volume was restored in the treatment liquid and the treatment liquid was suction-impregnated into the interior of the wood structure. The processing solution can be impregnated, the time required for the impregnation process can be extremely reduced, and the production efficiency can be greatly improved. Impregnated Also becomes possible, modification of wood, dyeing, can also be greatly streamline the processing steps, such as bleaching.

As described above, according to the method of the present invention, various problems in the conventional immersion method and boiling method (for example, the problem of waste liquid treatment and the impregnation rate) can be easily overcome, and the energy required for the processing is greatly reduced. It can be said that its industrial utility value is extremely high.

Claims (7)

(57) [Claims] 1. After swelling wood by adding moisture to the wood, the swollen wood is heated as a whole to boil the water content, thereby softening the wood into an elastic and flexible state. The cell wall pores constituting the tissue are opened, and then the elastically flexible wood is pressurized and compressed, and then the compressed elastically flexible wood is restored in volume in a processing solution to thereby reduce the wood. A method for impregnating wood with a treatment liquid, which comprises impregnating a tissue with a treatment liquid by suction. 2. Irradiation of microwaves on water-swelled wood causes the water content in the wood to boil to soften the wood into an elastic and flexible state and to open cell wall holes constituting the wood tissue. The method for impregnating wood with a treatment liquid according to claim 1. 3. Irradiation of far-infrared rays on water-swelled wood in high-temperature steam to boil the water-containing wood and soften the wood into an elastic soft state, and at the same time, cell walls constituting the wood tissue Claim (1) for opening a hole.
A method for impregnating wood with a treatment liquid as described above. 4. The method according to claim 1, wherein the swollen wood is boiled in boiling water so that the water content in the wood is boiled to soften the wood into an elastic and flexible state and to open the cell wall holes constituting the wood tissue. (1) The method of impregnating wood with a treatment liquid according to (1). 5. The method of impregnating wood with a treatment liquid according to claim 1, wherein the volume of the compressed elastic and soft wood is restored in a preservative treatment liquid. 6. The method for impregnating wood with a treatment liquid according to any one of claims 1 to 4, wherein the volume of the compressed elastic and soft wood is restored in a termite treatment liquid. 7. After swelling the wood with moisture, the swollen wood is heated as a whole to boil the water content, thereby softening the wood into an elastic and flexible state. The cell wall pores constituting the tissue are opened, and then the elastically flexible wood is pressed and compressed.After that, the compressed elastically flexible wood is brought into contact with the insoluble incombustible inorganic compound by phase contact. The cation and anion solutions are successively immersed in the resulting cation inorganic compound solution and anion compound solution, and the volume is restored in these solutions, whereby the cation and anion solutions are introduced into the wood tissue. A method for impregnating wood with a treatment liquid, wherein suction is performed to generate insoluble and non-flammable inorganic compounds there.