JPH0584706A - Manufacture of modified lumber - Google Patents

Abstract

PURPOSE:To provide a method wherein a raw lumber material is not required to be inpregrated with a solvent, and thereby obtain a modified lumber having insoluble compounds of high penetration rate for manufacturing modified lumber. CONSTITUTION:On the surface of a raw lumber material 5a, different chemicals 4a, 4b not containing a solvent practically are attached and, by spraying a solvent, the chemicals 4a, 4b are dissulved and impregenated into them whereby insoluble compounds 8 are produced and fixed in the lumber tissue system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing modified wood used as housing equipment, building materials and the like.

[0002]

2. Description of the Related Art Conventionally, wood is flame retardant (fireproof),
Antiseptic / insect proof, dimensional stability, water / moisture resistance, surface hardness,
As a modification method that imparts mechanical strength, abrasion resistance, and the like, methods such as compounding with an insoluble noncombustible inorganic material, compounding with a functional resin, chemical modification, and chemical impregnation are performed.

The composite method with the insoluble non-combustible inorganic material is mainly flame retardant (fireproof), dimensional stability, antiseptic / insect proof,
It is performed for the purpose of imparting mechanical strength and surface hardness. With this method, modified wood that reaches a quasi-incombustible level with respect to flame retardancy is obtained, and thus the obtained modified wood is used as a material for fire doors and the like. The compounding method with the functional resin is mainly carried out for the purpose of imparting water / moisture resistance, surface hardness, mechanical strength, abrasion resistance and the like. The modified wood obtained by this method is generally called WPC and is widely used as a floor material and the like.

The above-mentioned chemical modification methods are mainly based on dimensional stability,
It is performed for the purpose of imparting water resistance and moisture resistance. For example, modified wood obtained by acetylation is used as a material for water around bathtubs and the like. The chemical impregnation method is mainly used for the purpose of imparting antiseptic and insecticidal properties, and is widely used.

The following is a composite method with an insoluble noncombustible inorganic substance,
That is, a method for modifying wood by including an insoluble non-combustible inorganic material in wood will be described in detail. Generally, reforming methods for imparting flame retardancy to wood are roughly classified based on the following flame retardant mechanism. (A) Coating with an inorganic substance (b) Acceleration of carbonization (c) Inhibition of chain reaction in flaming combustion (d) Generation of incombustible gas (e) Endotherm by decomposition / release of crystal water (f) Thermal insulation by foam layer As will be described below, the modification method of including insoluble incombustible inorganic material in wood is, as described below, depending on the type of inorganic material, (b), (c), (d)
It is an excellent method that can also expect the effects of the above. Moreover, once the insoluble, non-combustible inorganic substance is fixed in the wood structure, it is less likely to dissolve out from the wood, so there is less concern that the effect will be diminished.

The mechanism of flame retardation (a) to (d) will be described in detail below. The coating with the inorganic substance of (a) means that even a combustible material can be made flame-retardant by compounding it with a non-combustible inorganic substance at an appropriate compounding ratio. For example, a conventionally known wood chip cement board is made by mixing combustible wood with non-combustible cement in a weight ratio of about 3: 1 to 1: 1 and molded into a plate shape. It is recognized as a non-combustible material.

The carbonization promotion of (b) is the following mechanism. When wood is heated, it decomposes thermally and produces combustible gas, which burns and burns.
In the presence of phosphoric acid or boric acid, pyrolysis of wood, that is, carbonization is promoted, and a carbonized layer is quickly formed.
This carbonized layer acts as a heat insulating layer and produces a flame retardant effect.
Therefore, when the insoluble noncombustible inorganic material contains a phosphoric acid component or a boric acid component, the flame retardant effect is further enhanced.

Inhibition of the chain reaction in flaming combustion of (c) is contributed by halogen, and in the radical oxidation reaction in the flame, halogen acts as a chain transfer agent, resulting in oxidation reaction. Is a mechanism by which the flame retardant effect is produced by the inhibition of Therefore, if the insoluble incombustible inorganic substance contains halogen, the flame retardant effect by this mechanism can be obtained.

The generation of nonflammable gas (d) is based on the following mechanism. That is, a mechanism in which compounds such as carbonates and ammonium salts generate carbon dioxide gas, sulfurous acid gas, and non-combustible gas such as hydrogen halide by thermal decomposition, and these gases dilute the combustible gas to prevent combustion. Is. Therefore, if the insoluble incombustible inorganic substance contains a substance capable of generating an incombustible gas such as carbonate, a flame retarding effect by this mechanism can be obtained together.

Next, the preservation and insect control of wood will be described. When fungi decompose wood, it is essential that hyphae first enter the wood lumen. However, if foreign matter is present in the wood lumen, mycelium cannot enter, so
As a result, it is less likely to rot. The foreign matter in the wood lumen does not have to be a drug having an antiseptic effect (antiseptic), and may be any as long as it is not a nutrient for fungi. Insect repellent is the same as preservative. Therefore, if the insoluble non-combustible inorganic substance is contained in the wood lumen, the antiseptic / insect repellent property of the wood can be improved. However, if the foreign substance has a drug effect, it has not been rubbed against it. For example, it is preferable that the foreign substance has poor digestibility against insects, does not digest, or has repellent action.

Further, dimensional stabilization and mechanical strengthening of wood will be described. If the wood can be swollen with water and some substance can be fixed in the cell wall of the wood, the bulk effect provides a dimensional stabilizing effect and a mechanical strengthening effect. That is, if the interior of the wood cell wall is occupied by the filler, the wood itself is less likely to expand or contract, and at the same time, various mechanical strengths are improved. Here, as the fixing substance, an inorganic substance which is hardly soluble in water can be used. Therefore, immobilization of an insoluble non-combustible inorganic substance in the wood cell wall can improve dimensional stability and mechanical strength.

Finally, the improvement of the hardness (surface hardness) of wood will be described. Generally, in order to increase the hardness of wood, it is generally necessary to fill a void such as a conduit inside the wood or a cell wall of the wood with a hard substance such as an inorganic substance. Since it suffices to do so, by fixing the insoluble non-combustible inorganic substance in the wood, the effect of reinforcing the wood cells and increasing the hardness can be obtained. In this case, if inorganic substances are intensively generated in the surface layer of wood,
More effective.

As described above, the method of incorporating an insoluble non-combustible inorganic material is very effective in modifying wood such as flame retardancy, but has conventionally had the following problems. .. Generally, insoluble incombustible inorganic materials are dispersed as they are in a solvent such as water, and even if the wood is dipped in a treatment liquid consisting of this dispersion and the treatment liquid is allowed to permeate into the wood, almost no permeation occurs. Only solvent such as water will be left. This is for the following reason. That is,
The narrowest part of the path through which the treatment liquid passes when it penetrates into wood is the pit membrane, but the pore size here is about 0.1 μm, whereas the dispersed insoluble non-combustible inorganic particles are This is because it is usually much larger than 0.1 μm.

Therefore, a method for solving this problem has been developed. That is, two kinds of aqueous solutions separately containing a cation and an anion that react with each other by mixing to generate an insoluble non-combustible inorganic substance (hereinafter, referred to as "cation-containing treatment liquid" and "anion-containing treatment liquid" in order)
Is prepared by dissolving a water-soluble inorganic substance in water,
This is a method of producing modified wood in which both aqueous solutions are sequentially impregnated into raw wood and the above ions are reacted in the wood to produce an insoluble incombustible inorganic substance (JP-A-61).
-246003, etc.).

According to this method, the insoluble incombustible inorganic substance is not permeated as solid particles but is permeated in a state of being dissolved in a medium such as water in the form of ions, so that impregnation is easy and an extremely large amount is obtained. The insoluble non-combustible inorganic substance can be efficiently included in wood. Therefore, it is possible to obtain a modified wood which is extremely excellent in antiseptic / insect repellent properties and dimensional stability.

In this modification method, specifically, the cation-containing treatment liquid and the anion-containing treatment liquid separately dissolve the water-soluble inorganic substance containing a predetermined cation and the water-soluble inorganic substance containing a predetermined anion in water. More specifically, a combination of treatment solutions containing a single water-soluble inorganic substance (single solution system multiplication) is usually used. For example, wood is impregnated with a cation-containing treatment liquid containing CaCl ₂ and an anion-containing treatment liquid containing K ₂ CO ₃ , or a cation-containing treatment liquid containing AlCl ₃ and an anion-containing treatment liquid containing (NH ₄ ) ₂ HPO _4. The liquid and the wood are impregnated to generate insoluble and non-combustible inorganic substances in the wood.

As described above, various wood modifying methods have been studied and studied.
It is carried out by impregnating the chemical by dipping the wood in the chemical solution, and by reacting the chemical in the wood by repeating the dipping treatment.
Fixing, or pressure / pressure impregnation, is performed in batch processing.

However, in the treatment for modifying wood by reacting chemicals with each other in wood, there is a problem that the chemicals react outside the wood, and different chemicals that react with each other are mixed and used. There is a problem that the usable time of the chemical solution is short. Further, since it is a batch processing type, it is necessary to repeat the work of impregnating wood with the chemical solution after it is prepared. Therefore, there is a problem that the production efficiency is poor and it is difficult to get into the mass production process.

Further, as shown in FIG. 5, the modification obtained by the above-mentioned conventional method in which the cation-containing treatment liquid and the anion-containing treatment liquid are successively impregnated into the raw material wood to form and fix an insoluble non-combustible inorganic substance in the wood. Since the wood 1 contains a larger amount of insoluble non-combustible inorganic material 2 in the surface layer portion than in the central portion of the wood cross section, when the wood surface is cut or polished, the loss of the inorganic material is large, There was a problem that performance deteriorated.

Therefore, in order to solve these problems, the inventors of the present invention have applied to the raw material wood to be modified different chemical agents which react with each other to produce an insoluble compound from the opposite side of the raw material wood. A method for producing modified wood that is impregnated to produce and fix the insoluble compound in the wood tissue has been developed, and a patent has already been applied for. The impregnation of the chemical in this manufacturing method is performed by adhering the chemical containing no solvent or the chemical in the form of a solution to the raw wood.

[0021]

However, in the above-mentioned conventional method, when a solvent-free chemical is used, in order to impregnate the raw material wood with the chemical, it is necessary to preliminarily contain the solvent in the raw material wood. Was needed. In addition, when using a drug in solution, it is not necessary to preliminarily include a solvent in the raw wood, but the concentration of the reaction component in the drug (solution) is limited, and a large amount of the reaction component can be used. Since it is difficult to impregnate, there remains a problem that modified wood having a high impregnation rate of an insoluble compound cannot be obtained.

In view of such circumstances, the present invention eliminates the need for preliminarily containing a solvent in the raw material wood, and
It is an object to provide a method capable of obtaining a modified wood having a high impregnation rate of an insoluble compound.

[0023]

In order to solve the above-mentioned problems, the method for producing modified wood according to the present invention is directed to different raw materials (woods to be modified) that react with each other to produce insoluble compounds ( Hereinafter, this may be simply referred to as "different agent".) A method for producing modified wood in which the insoluble compound is formed and fixed in the wood tissue by impregnating the wood from opposite sides of the raw wood. Different chemicals are used that do not substantially contain a solvent, and these are adhered to the surface of the raw material wood, and the solvent is sprayed to dissolve them so that the different chemicals are impregnated. Characterize.

The raw material wood for reforming used in the present invention is not particularly limited, and examples include raw wood logs, lumber products, sliced veneer, plywood, etc. On the other hand, it is preferable that it is wide. Further, the tree species thereof are not limited at all. In the present invention, the insoluble compound that is generated in wood and dispersed / fixed in the wood tissue is not particularly limited,
For example, insoluble incombustible inorganic substances, insoluble organic compounds, and the like, which will be described in detail below, may be mentioned.

-Insoluble Incombustible Inorganic Material- The insoluble incombustible inorganic material is not particularly limited,
Examples thereof include various salts such as borate, phosphate, hydrogen phosphate, carbonate, sulfate, hydrogen sulfate, silicate, nitrate, and hydroxide. Of these salts, specific examples of carbonates include BaCO ₃ and CaCO ₃ .
₃ , FeCO ₃ , MgCO ₃ , MnCO ₃ , NiCO ₃ ,
ZnCO _{3 and the} like. Two or more insoluble incombustible inorganic materials may coexist in wood. The insoluble non-combustible inorganic substance in wood may be settled in the form of reacting with wood cellulose.

It should be noted that one kind of insoluble non-combustible inorganic material may contain two or more kinds of cation and / or anion species described below. In order to generate an insoluble incombustible inorganic substance in a wood tissue, as a different agent to be impregnated into a raw material wood, a group of water-soluble inorganic compounds described below containing a cation species constituting a cation part of this insoluble incombustible inorganic substance is used. A cation-containing drug and an anion-containing drug composed of another group of water-soluble inorganic compounds described below containing an anion species forming the anion portion of the insoluble non-combustible inorganic material may be used.

Here, the cation species constituting the cation portion of the insoluble incombustible inorganic material is not particularly limited, but examples thereof include alkali metals such as Na and K, Ca and B.
Alkaline earth metals such as a, Mg, Sr, Fe, Cu, C
Examples include transition elements such as o, Mn, Ni and Cd, carbon group elements such as Si and Pb, Zn and Al. Among these, alkali metals, alkaline earth metals, Zn and Al
Is preferred. Further, among the alkaline earth metals, cations of Ca, Ba and Mg are preferable.

Further, the anion part of the insoluble incombustible inorganic material is
The constituent anion species is not particularly limited,
For example, B_Four O₇ , BO₃ , PO_Four , CO₃ , SO
_Four , NO₃ , Cl, Br, F, I and OH and the like.
Be done. Among these, BO ₃ , PO_Four , CO₃ , S
O_Four , F, Cl, Br and OH anions are preferred.
Yes. Among these anions, B_Four O₇ , BO₃ 
And PO_Four Flame retardancy due to the mechanism of (b) above
The effect is CO₃Is difficult due to the mechanism (d) above.
If the halogen effect of Cl, F, Br, etc.
The flame retardant effect due to the mechanisms of (c) and (d) is
You can expect each one.

The above cations and anions are generated in wood.
Depending on the composition of the desired insoluble non-combustible inorganic material
Selected arbitrarily. However, the cation and anion
Incombustible in wood tissue when combined with
A combination that allows inorganic substances to be easily generated is selected appropriately.
Be done. Inorganic that dissolves in water to produce the desired cation
Although the material is not particularly limited, for example, MgCl 2
₂ , MgBr₂ , MgSO_Four ・ H₂ O, Mg (NO₃) ₂ 
・ 6H₂ O, CaCl₂ , CaBr₂ , Ca (NO₃)
₂ , BaCl₂ ・ 2H₂O, BaBr₂ , Ba (NO₃)₂
 , AlCl₃ , AlBr₃ , Al₂(SO_Four)₃ , Al
(NO₃)₃ ・ 9H₂ O, ZnCl₂ Etc.

The inorganic substance which dissolves in water to generate the desired anion is not particularly limited, and examples thereof include Na ₂ CO ₃ , (NH ₄ ) ₂ CO ₃ , H ₂ SO ₄ , N.
_{a 2 SO 4, (NH 4} ) 2 SO 4, H 3 PO 4, Na 2 H
PO ₄ , (NH ₄ ) ₂ HPO ₄ , H ₃ BO ₃ , NaBO
₂ , NH ₄ BO _{2 and the} like. -Insoluble Organic Compound- The insoluble organic compound is not particularly limited, and examples thereof include an insoluble resin. Two or more kinds of insoluble organic compounds may coexist in wood.

The different agents for producing the insoluble organic compound in the wood are arbitrarily selected according to the composition of the desired insoluble organic compound to be produced in the wood and are not particularly limited. In the case of producing a resin, a chemical consisting of a urea-based, epoxy-based, phenol-based, melamine-based or acrylamide-based resin and a curing agent, or a chemical consisting of the resin and a variety of additives. Etc. are used.

The different drugs used in the present invention may be solid or liquid as long as they do not substantially contain a solvent. Further, these drugs may be inorganic drugs and organic drugs. Examples thereof include, but are not particularly limited to, drugs such as melamine resin and drugs such as phosphate. Each of the substances constituting the drug may be used alone as a drug, or a plurality of types may be used in combination in one drug as long as they do not react with each other in one drug.

The degree of dissolution of the drug by spraying the solvent, which will be described later, varies depending on the kind of the drug. Therefore, in order to produce a large amount of insoluble compound in wood, the compound is dissolved in the solvent described later as much as possible. It is preferable to use a good drug. The method of impregnating the different chemicals described above from the opposite surfaces of the raw material wood is not particularly limited, but for example, one of the different chemicals can be applied to the opposite surfaces A and B of the raw material wood. A method of adhering to the surface and impregnating by adhering the other chemical to the surface B can be mentioned. In addition, the raw material wood with one of the chemicals attached to one side and the other raw wood with the other chemical attached to one side of the raw material are stacked alternately with the surfaces with the chemicals attached in the same direction. You may make it impregnate by this. This method is preferable because a plurality of raw wood materials can be treated at one time and the treatment efficiency is improved. The method of attaching the chemical to the wood is not particularly limited. For example, if the drug is a solid, it may be applied by sprinkling it on a wood surface. Also, when the drug is a liquid, it may be applied by applying it to the wood surface. The method of applying the liquid drug is not particularly limited, and for example, a brush or a spray may be used.

The number of times the chemical is impregnated is not particularly limited. 1
It may be impregnated only once, or may be impregnated multiple times. When impregnated a plurality of times, the agents may be of the same kind or different kinds between the impregnation times. However, in the present invention, the impregnation of the drug needs to be performed by dissolving the drug by spraying a solvent on the drug. Regarding the timing of solvent spraying to the drug,
It is not particularly limited. For example, solvent spraying may be performed before the chemicals are attached to the raw wood, or solvent spraying may be performed after the chemicals are attached to the raw wood. However, when laminating a plurality of raw material woods with chemicals attached as described above, it is necessary to spray a solvent on the chemicals that come to the interface of the laminate before the raw woods are laminated. is necessary.

As the solvent to be sprayed on the drug, water is preferable from the viewpoint of impregnation efficiency, but it is not limited to this. For example, when impregnating an organic substance such as the above-mentioned resin, an organic solvent may be used. The method of applying the solvent to the drug is not particularly limited, and examples thereof include a method of spraying with a mist or a spray, and a showering method.

The amount of the solvent sprayed may be such that the drug is dissolved by the solvent sprayed and can penetrate into the wood, and the drug does not flow out and be lost. It is preferable to control the amount as much as possible. When impregnating and reacting with the drug, it is preferable that the sprayed water or other solvent does not volatilize from the drug. The method is not particularly limited, and examples thereof include a method of sealing wood.

Regarding the treatment conditions such as the treatment time and temperature for impregnation, the drug is easily dissolved and permeated by the sprayed solvent,
The conditions may be set so that a desired amount of insoluble compound is produced, and there is no particular limitation. When performing the impregnation treatment or after the impregnation treatment, a curing treatment may be performed as necessary to accelerate the impregnation of the drug and the formation reaction of the insoluble compound to further enhance the treatment efficiency.

Examples of the method of curing treatment include a method of applying a physical stimulus such as ultrasonic vibration, pressurization, radio waves, high frequency waves, microwaves and the like. The method of giving a physical stimulus is an excellent method which can generate a large amount of an insoluble compound in wood in a short time by promoting the diffusion / reaction of a drug. However, the present invention is not limited to these, and the curing treatment may be performed under high temperature and high humidity or under a high temperature and high concentration atmosphere of a solvent other than water. This method
It is an excellent method that can accelerate the dissolution and impregnation of the drug by the condensed water or other solvent and also accelerate the reaction of the drug in the wood, and it is particularly effective when the drug is solid. ..

The temperature, time, etc. of the curing treatment are not particularly limited. After the insoluble compound is generated and fixed in the wood by the above-mentioned impregnation treatment, the surface of the wood is washed with water or the like, if necessary, and dried to obtain modified wood. In order to improve the durability and weather resistance of the modified wood, the modified wood obtained is left in the wood by immersing it in water or another suitable solvent, if necessary. You may remove soluble unreacted chemicals and by-products. These soluble components have a large amount of water absorption and moisture absorption, and depending on their type, they may show deliquescent properties.Therefore, if these components are present in the wood in excessive amounts, the water absorption and hygroscopicity of the wood will be too high. This is because there is a risk that it will be inappropriate as such. on the other hand,
Among such soluble components, not only the dimensional stabilization of wood, but also many components that can contribute to mechanical strength and flame retardancy, so leave them as appropriate,
One measure is to improve the timber performance by that amount.

[0040]

In the present invention, the different chemicals which do not substantially contain the solvent are used, and these are adhered to the surface of the raw material wood, and the solvent is sprayed to dissolve them so that the different chemicals are impregnated. I'm trying to do it.
By using a different drug that does not substantially contain a solvent, there is no problem due to the limitation of the concentration of the reaction component in the drug as in the case of using a solution drug. In addition, different chemicals are attached to the surface of the raw material wood and dissolved by spraying a solvent on them to impregnate these chemicals so that the raw material wood does not need to contain the solvent in advance. Different chemicals penetrate into wood, and when they meet in wood, they react with each other, and a large amount of insoluble compounds are formed and settled from the center of wood.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. 1 and 2 represent one example. First, as shown in FIG. 1, the anion-containing drug 4a is uniformly sprayed on the surface of the vinyl sheet 3, and water is sprayed evenly on the drug 4a by spraying. On this vinyl sheet 3, the cation-containing drug 4 is placed on the upper surface.
b is sprayed evenly on the chemical 4b and water is sprayed onto the chemical 4b in the same manner as above, and the anion-containing chemical 4a is uniformly sprayed on the upper surface of the chemical, and water is sprayed on the chemical 4a in the same manner as described above. The sprayed raw material veneers 5b are alternately stacked with the surfaces on which the chemicals are sprayed facing upward. Then, a single plate laminate as shown in FIG. 2 is obtained.
The anion-containing drug 4a is present on the surface or interface 6a of this single-plate laminate, and the cation-containing drug 4b is present on the surface or interface 6b.

Next, this single plate laminated body is sealed and kept at room temperature to 6%.
Allow to cure for 1 to 3 days at 0 ° C. Then, for example, in FIG.
As shown in Fig. 4, the added water causes the anion-containing drug 4
The anions 7a and cations 7b generated by the dissolution of a and the cation-containing drug 4b permeate from the lower surface and the upper surface of the veneer 5a toward the central portion using water as a medium, and they meet at the central portion. By reacting, the insoluble non-combustible inorganic substance 8 is generated from the central portion.

As a result, as shown in FIG. 4, modified wood 9 having a large amount of insoluble non-combustible inorganic material 8 formed and fixed in the center thereof
To get Hereinafter, more specific examples and comparative examples of the present invention will be shown, but the present invention is not limited to the following examples and the examples already described. -Example 1-As a raw material wood, 11 pieces of 3 mm-thick Agatisu wood rotary veneers with a water content of 10 to 12% which were not subjected to pretreatment (water containing treatment) were used.

As anion-containing drug on vinyl sheet
((NH_Four)₂HPO_Four60g / measure² ("Shaku ² Is 0.303m
That. same as below. ) Is evenly distributed and
100g / measure of water by spraying on the anion-containing drug² Amount of
Sprayed evenly. On this vinyl sheet,
One of the veneers was placed. Next, the top surface of this veneer
, BaCl as a cation-containing drug₂・ 2H₂200 g / O
Shaku²Of this cation-containing drug
Water in the same manner as above, 200 g / scale² Evenly blown
Put another raw veneer on top of it, and then
On the surface (NH_Four)₂HPO_Four120 g / measure²Evenly spread
Both the anion-containing drug and water in the same manner as above 2
00g / measure² Repeatedly spraying evenly
did. And, on the upper surface of the final 11th raw material veneer,
BaCl₂ ・ 2H₂O is 100g / measure²And evenly spread
Water is added to this cation-containing drug in the same manner as described above.
0g / measure² The amount was sprayed uniformly.

The thus laminated veneers were wrapped with a vinyl sheet and sealed, and cured at room temperature for 24 hours. Then, the veneer was washed with water and dried to obtain modified wood. -Examples 2-5- By carrying out the same operation as in Example 1 under the conditions shown in Table 1 below, modified wood was produced.

-Comparative Example- As a raw material wood, the same veneer as in Example 1 was used.
On top of BaCl₂・ 2H₂O water solution (concentration 2 mol / water 1 liter
50g / scale of cation-containing drug ² Amount of
Apply it to the bottom surface and (NH_Four)₂HPO_FourAqueous solution
Anion-containing drug consisting of (concentration 2 mol / water 1 liter)
50g / measure² Was evenly applied.

The veneer was wrapped in a vinyl sheet and sealed, and cured at room temperature for 24 hours. Then, the veneer was washed with water and dried to obtain modified wood.

[0048]

[Table 1]

The modified woods obtained in Examples 1 to 5 and Comparative Example above were examined for the impregnation rate and impregnation state of the insoluble, non-combustible inorganic material, and the flame retardancy, antiseptic property and termite resistance. The impregnation rate of the insoluble incombustible inorganic material was determined according to the following formula. Impregnation rate (%) = {(W ₂ −W ₁ ) / W ₁ } × 100 (In the formula, W ₁ represents the absolute dry weight of untreated wood, and W ₂ represents the absolute dry weight of treated wood.) Flame retardance test is JIS-A13
According to the surface test of No. 21, those having flame retardancy of 3 or higher were evaluated as ◯, and those not having flame retardancy of 3 but having flame retardancy were evaluated as Δ.

The antiseptic test and the termite proof test were conducted in accordance with JWPA Standard No. 3 and JWPA Standard No. 11, respectively, and an efficacy value of 98 or more was marked with "⊚" and 90 or more and less than 98 was marked with "○".
And less than 90 were evaluated with Δ. The above results are shown in Table 2 below.

[0051]

[Table 2]

As shown in Table 2, the modified woods obtained in Examples 1 to 5 produced a larger amount of insoluble non-combustible inorganic material than the modified woods obtained in the Comparative Examples. It was confirmed that the composition was excellent in terms of antiseptic property, antitermite property and flame retardancy.

[0053]

EFFECTS OF THE INVENTION According to the method for producing modified wood according to the present invention, it is not necessary to preliminarily include a solvent in the raw wood, and at the same time, an insoluble compound having a high impregnation rate can be formed and fixed in the wood. Therefore, the modified wood having excellent antiseptic / insect repellent properties, flame retardancy, etc. can be obtained efficiently at low cost.

The modified wood thus obtained has a large amount of insoluble compounds formed and fixed in the center of the wood, and therefore, when the surface of the wood is processed, the loss of the insoluble compound on the wood surface is small. Therefore, performance degradation can be suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a state in which single plates are to be stacked in an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a state in which the single plates have been stacked in the embodiment.

FIG. 3 is a schematic diagram illustrating how a single plate is impregnated with a drug in the above-mentioned example.

FIG. 4 is a side cross-sectional view showing a state of formation of insoluble and non-combustible inorganic matter inside the modified wood obtained in the above example.

FIG. 5 is a side cross-sectional view showing a state of formation of insoluble noncombustible inorganic matter inside modified wood obtained by a conventional method.

[Explanation of symbols]

 4a Anion-containing chemical agent 4b Cation-containing chemical agent 5a Raw material veneer 5b Raw material veneer 8 Insoluble incombustible inorganic material 9 Modified wood

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Konishi 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Arihiro Adachi, 1048, Kadoma, Kadoma City, Osaka Matsushita Electric Co., Ltd.

Claims (2)

[Claims] 1. The raw material wood to be modified is impregnated with different chemical agents that react with each other to generate an insoluble compound from opposite sides of the raw material wood, thereby forming and fixing the insoluble compound in the wood tissue. A method for producing modified wood, which comprises using as the different chemicals substantially no solvent, adhering these to the surface of the raw wood, and dissolving them by spraying a solvent on them, A method for producing modified wood, which comprises impregnating different chemicals. 2. A raw material wood prepared by adhering one of one of the different chemicals which react with each other to produce an insoluble compound on one side and solvent-spreading it, and another chemical on one surface and solvent-spraying it. The method for producing a modified wood according to claim 1, wherein another raw material wood is impregnated with the chemicals by alternately stacking the chemicals-adhered surfaces in the same direction.