JP2000084905A - Method for infiltrating medicine in wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infiltrating method of a medicine, which develops no ununiform pouring irrespective of the kind of a tree with a simple method without necessitating a pouring device under vacuum and pressure. SOLUTION: In order to infiltrating a medicine in a wood, the wood, the water content of which is above its fiber saturation point, is immersed in an oily processing liquid, which does not mix with the water at an arbitrary ratio, under the temperature not lower than the room temperature and not higher than 100 deg.C so as to infiltrate the medicine in the wood through the replacement of the water with the processing liquid. As the medicine to be used, any medicine, which is used generally and conventionally for a WPC, a modified wood, a preservation of wood against decay and insect, a dyeing or the like as long as one does not mix with the water at an arbitrary ratio and has oily properties, may well be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for impregnating wood with a chemical.

[0002]

2. Description of the Related Art In order to improve the aesthetics, antiseptic properties, hardness, abrasion resistance, stain resistance, decay resistance, dimensional stability, etc. of wood, materials such as resins or oils, preservatives, dyes and the like are used. The technique of impregnating the drug is indispensable. What is important in the impregnation technique is how quickly and evenly the drug is impregnated into a target site, and a method using a reduced pressure or pressure injection device has been widely used. However, these impregnation methods have some disadvantages. That is, in the case of decompression / pressurization injection, a decompression / pressurization injection device requiring an expensive and complicated operation is required, and therefore, there is a drawback that the production cost is increased, which is a major obstacle to its widespread use. In addition, since air in the material is removed by decompression and then injected by pressurization, the effect is hardly seen in so-called hardly injectable tree species having independent voids. On the other hand, as a method that does not use a pressure-reducing / pressure-injecting apparatus, the material is heated and swelled in water or a mixed solution with a hydrophilic solvent having a wood swelling ability, and then the high-temperature wood is removed. A method of impregnation by immersion in a processing solution at a lower temperature (Japanese Patent Laid-Open No. 5-116111) is being studied. However, in this method, wood having a temperature higher than the temperature of the processing solution must be immediately immersed in the processing solution, which not only involves danger in work, but also requires immersion in the processing solution before the material is cooled. The invention is fundamentally different from the present invention in that it is limited to water solubility, and its mechanism is suction under a reduced pressure state that is temporarily generated by immersing high-temperature wood in a lower-temperature treatment liquid. In addition, by heating the synthetic resin or fats and oils to be impregnated to 100 ° C. or more in advance,
A method of impregnation (JP-A-61-172704) has been studied. However, the mechanism of this method also basically boils the water in the material at a high temperature of 100 ° C or higher,
After expelling air and moisture with the vapor pressure, the processing liquid is suctioned under reduced pressure conditions when the material temperature decreases.
That is, these methods are nothing but modifications of the decompression method, and are based on a completely different mechanism from the solvent substitution of the present invention.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a simple and safe method for injecting any kind of tree without the need for expensive decompression / pressurization injection equipment and handling of dangerous high-temperature oils and materials. It is an object of the present invention to provide a method of impregnating a medicine with a uniform finish.

[0004]

Means for Solving the Problems The present inventors have found a phenomenon in which water is replaced with an oily substance simply by immersing hydrated wood in an oily liquid. As a result of diligent studies to apply this phenomenon to wood impregnation, wood with a high water content higher than the fiber saturation point of wood (approximately 28%) in advance, that is, wood in a state where free water exists, is generally mixed with water. We have developed a method of impregnating the drug in the material very efficiently by immersing it in an oily drug that does not mix at a rate of, and replacing the drug with water. That is, the feature of the present invention is to replace the treatment chemical with water originally present in wood or water impregnated artificially. The mechanism that the method of the present invention is fundamentally different from other impregnation treatments is that the difference between the water content of the wood before the treatment liquid impregnation and the WPG (the weight increase due to the treatment) after the treatment is shown in Table 1. As shown, it is clear from the strong positive correlation.

[0005]

[Table 1] In other words, if the purpose is to treat wood with sufficient WPG, the moisture content should be high, and if the purpose is mild treatment, the moisture content should be relatively low above the fiber saturation point. become. It is a great advantage of the present invention that a treated wood having a desired impregnation rate can be obtained by adjusting the water content of the untreated wood in this way.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The chemicals used in the present invention include, in general, WPC, modified wood, wood preservatives and insect repellents,
What is used for dyeing and the like and does not mix with water at an arbitrary ratio may be used. What has oily property may be used. In the case of chemicals such as preservatives and dyes which need to be adjusted in concentration when used, they can be dissolved in an oily solvent before use. For example, synthetic resins include acrylate resins, unsaturated polyester resins, alkyd resins, epoxy resins, urethane resins, diallyl phthalate resins, etc., and oils and fats such as linseed oil and boiled oil. Refers to oil, etc. Preservatives include creosote oil, pentachlorophenol laurate, monochloronaphthalene and the like. Examples of the dye include oil-soluble dyes such as azo type and anthraquinone type. Of course, it is also possible to use a raw material or a high-moisture content veneer immediately after being prepared with a rotary lace or a slicer, which is more desirable from the viewpoint of cost and productivity. The moisture content of the material is not particularly limited as long as it is a high moisture content above the fiber saturation point, but the amount of the impregnated drug is determined according to the moisture content,
When importance is placed on strength and abrasion resistance, the water content is preferably set to a high water content, for example, 100% or more so that the voids of the wood are sufficiently filled with the resin. If it is desired to save the amount of the chemical to be used, it is preferable to make the water content lower than that. The replacement of water and chemicals proceeds simply by immersing the free water wood. The substitution proceeds even at room temperature, but generally, the higher the temperature, the lower the viscosity of the treatment liquid and the higher the substitution rate, so that the productivity is improved. However,
In the case of general wood, free water inside the wood boils at about 100 ° C or more, and in the case of difficult-to-inject wood, about 110 ° C,
It is not preferred because it is lost. Therefore, the temperature of the medicine should be 110 ° C or lower, preferably in the range of 70 to 90 ° C. Hereinafter, the present invention will be described in more detail with reference to Examples, but this does not limit the present invention.

[Example 1] For example, 1.
A larch veneer (24 × 24 cm) having a thickness of 0 mm is immersed in a mixture of two types of acrylate-based resin raw materials (M240, M8030, manufactured by Toagosei Co., Ltd.), and is impregnated at 75 ° C. for 1 hour to impregnate the resin. Got wood. The obtained resin-impregnated wood was cured by a conventional method to obtain a desired resin-impregnated wood. Table 2 shows the results of the hardness and wear resistance of the WPC boards obtained from Example 1 and Comparative Example 1, which were determined based on the wear A test specified in JIS Z2117 and JAS.
Shown in The resin impregnation rate was calculated by the following equation. Resin impregnation rate (%) = (resin impregnated wood weight-untreated wood absolute dry weight) / untreated wood absolute dry weight × 100% The impregnation rate of the obtained WPC is remarkably improved as compared with Comparative Example 1. The hardness and abrasion resistance have also been greatly improved.
[Comparative Example 1] The same resin raw material used in Example 1 was applied to the same air-dried larch veneer as in Example 1 under the same temperature conditions.
Impregnation was performed using a reduced pressure method. The depressurizing and pressurizing conditions are generally performed conditions, that is, 5 mHg for 30 minutes, 6 atm for 4 hours.

[0008]

[Table 2]

Example 2 Saturated 0.5 (fiber direction) × 3.0 (radial direction) × 3.0 (tangential direction) cm
Of Shino-ki block material of acrylic resin (M24
0, manufactured by Toagosei Co., Ltd.)
The resin was impregnated at 1 ° C. for 1 hour to obtain a resin-impregnated wood. A hardening treatment was performed on the obtained resin liquid impregnated wood. [Comparative Example 2] A linden block material having the same dimensions as in Example 2 was immersed in an air-dried state in a mixed solution of an acrylic resin raw material (M240, manufactured by Toagosei Co., Ltd.), and dried with an oil rotary vacuum pump.
The pressure was reduced to mmHg, and after 30 minutes, the pressure was returned to normal pressure and left overnight. Table 3 shows the results of the dimensional stability test of the resin-impregnated wood obtained from Example 2 and Comparative Example 2. Dimensional stability (ASE) was calculated by the following equation. ASE (%) = (Dimensional change rate of untreated material−Dimensional change rate of resin-impregnated wood) / (Dimensional change rate of untreated material) × 100%

[0010]

[Table 3]

[Example 3] 10.0 (fiber direction) x 3.0 (radial direction) x 5.0 (tangential direction) c.
m birch board and larch wood were immersed in creosote oil and impregnated at 75 ° C. for 4 hours to obtain desired creosote oil-impregnated wood. Comparative Example 3 Example 3
Birch and larch boards of the same dimensions as above were immersed in creosote oil kept at 75 ° C. in an air-dried state, reduced to 5 mmHg by an oil rotary vacuum pump, returned to normal pressure after 30 minutes, and allowed to stand overnight. Thereafter, the mixture was pressure-injected at 6 atm by a pressure device for 4 hours, returned to normal pressure, and left overnight. Table 4 shows the results (average value) of calculating the impregnation rate of the creosote oil-impregnated wood obtained from Example 3 and Comparative Example 3.

[0012]

[Table 4]

Example 4 10.0 (fiber direction) × 3.0 (radial direction) × saturated only in the surface layer (about 5 mm)
A 5.0 cm (tangential direction) cedar board material was immersed in the dyeing solution and impregnated at 60 ° C. for 5 hours to obtain a desired dyed wood. Comparative Example 4 A cedar board material of the same dimensions as in Example 4 was immersed in a dyeing solution in an air-dried state, reduced to 5 mmHg by an oil rotary vacuum pump, returned to normal pressure after 30 minutes, and left overnight. Thereafter, the mixture was pressure-injected at 6 atm by a pressure device for 4 hours, returned to normal pressure, and left overnight. Example 4 and Comparative Example 4
Cut the dyed wood obtained in step 2cm in the fiber direction,
Observation of the wood front showed that the stained wood of Example 4 was stained only in the saturated part of the surface layer,
In the dyed wood of Comparative Example 4, only a small area around the tracheid was dyed.

[0014]

According to the present invention, various chemicals can be injected into wood by a simple method without requiring a large amount of equipment investment and a decompression / pressure injection device requiring complicated maintenance and inspection. Is an advantage when entering new high value-added fields of timber. In addition, by using the method of the present invention, it is possible to impregnate chemicals even for hard-to-inject wood such as larch without performing a process such as an insizing process or a compressing process that reduces aesthetics or strength. This makes it possible to increase the added value of tree species that have been considered unsuitable for chemical treatment and preservative treatment. Furthermore, the impregnated wood produced by the present method has better performance than that impregnated by a known method, so that higher added value and product differentiation can be achieved. from these things,
The present invention is considered to greatly contribute to forestry and the forestry industry.

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[Procedure amendment]

[Submission Date] September 16, 1999 (1999.9.1)
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

[Table 2]

Claims (1)

[Claims] 1. A method in which wood having a water content equal to or higher than the fiber saturation point is immersed in an oily treatment liquid that does not mix with water at an arbitrary ratio at a temperature between room temperature and 100 ° C., and the water is replaced with the treatment liquid. Impregnating the agent into wood by the method.