JPH05318414A - Production of modified lumber - Google Patents

Abstract

PURPOSE:To produce modified lumber which is capable of fixing soluble unreacted chemicals and a byproduct and is more enhanced in performance such as fire retardant property (fireproof property) in comparison with a conventional method. CONSTITUTION:Lumber for a raw material is impregnated from the opposite faces with the different chemicals which mutually react to produce an insoluble compound. The insoluble compound is produced and fixed in the structure of lumber. In this case, lumber for the raw material is impregnated with the other chemicals which react with the soluble unreacted substance of the difference chemicals and the byproduct and insolubilize them.

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 for 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, the modified wood obtained by the conventional method in which the cation-containing treatment liquid and the anion-containing treatment liquid are successively impregnated into the raw material wood to produce and fix the insoluble non-combustible inorganic substance in the wood is In comparison with the above, since the surface layer contains a larger amount of insoluble non-combustible inorganic material, when the wood surface is cut or processed such as polishing, there is a problem that the loss of the inorganic material is large and the performance is deteriorated. ..

In order to solve such a problem, the inventors have made various studies. As a result, the raw material wood to be modified is impregnated with different chemical agents that react with each other to form an insoluble compound from opposite sides of the raw material wood, and the insoluble compound is generated and fixed in the wood tissue. Developed a wood manufacturing method. According to this method, there is no need to mix different chemicals that react with each other, the usable time of the chemicals is long, and the chemicals are reacted only in the wood without any reaction between the chemicals outside the wood. In addition to being able to reform continuously well, a large amount of active ingredients (insoluble compounds) are generated and settled in the center of the wood because the reaction of the chemical agent occurs from the center of the wood. It is possible to obtain a modified wood that is less likely to deteriorate.

[0021]

However, as described above,
Modified wood obtained by a method of impregnating different raw materials from opposite sides of raw wood contains soluble unreacted chemicals and by-products in addition to insoluble compounds.
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. There is a risk that it will be inappropriate as such. In order to prevent this, it is necessary to immerse the wood in water or another suitable solvent to remove soluble unreacted chemicals and by-products remaining in the wood (leaching process). .. However, among these soluble components, there are many components that can contribute not only to dimensional stabilization of wood, but also to mechanical strength, flame retardancy, and imparting antiseptic / insect repellent properties. It is also a good idea to leave them as appropriate to improve the performance of the timber.

Therefore, according to the present invention, a soluble unreacted drug or by-product can be immobilized as compared with the conventional method,
An object of the present invention is to provide a method capable of obtaining a modified wood having further improved performance such as flame retardancy (fire protection).

[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, these may be simply referred to as “different agents”.) A method for producing modified wood in which the insoluble compound is formed and fixed in the wood tissue by impregnating opposite surfaces of the raw wood with each other. By impregnating the raw material wood with other chemicals capable of reacting with the soluble unreacted products and byproducts of the drug to make them insoluble, the soluble unreacted products and byproducts are insolubilized in the wood. The feature is that it is fixed.

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. There is no limitation on the species of the trees. Further, the number of stacked raw wood materials is not limited at all. In the present invention, the insoluble compound generated in wood and dispersed / fixed in the wood tissue is not particularly limited, but examples thereof include insoluble nonflammable inorganic substances and insoluble organic compounds described in detail below.

-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, a group of water-soluble inorganic compounds described below containing a cationic species constituting a cation part of the insoluble incombustible inorganic substance or its A cation-containing drug consisting of an aqueous solution and another group of water-soluble inorganic compounds described later containing an anion species constituting the anion part of the insoluble non-combustible inorganic compound or an anion-containing drug consisting of an aqueous solution thereof 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 CO₃ Is 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
Insoluble and non-combustible 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 of these resins, or a chemical consisting of the respective resins and various additives And the like are used.

The different agents used in this invention may be inorganic agents and organic agents. Examples thereof include, but are not particularly limited to, drugs such as melamine resin and drugs such as phosphate. The different drugs used in the present invention may be solid or liquid.
Although the drug in solution may be used, it is preferable that at least one of the different drugs is in the form of a solid or a viscous liquid. A solid or viscous liquid drug can be attached to the wood surface in a large amount by the method described later, and as a result, a larger amount of an insoluble compound is produced in the wood and the performance of the wood is improved. This is because it can be further improved. 200g of chemicals on the wood surface
/ M ² or more, in order to attach it, as a solid drug,
It is preferable to use a powdery or particulate solid substance or a substance obtained by adding a small amount of a solvent to this solid substance. As the viscous liquid drug, one having a viscosity of 500 centipoise or more is used. preferable.

The substances constituting the drug may be used alone or as a drug together with a solvent and the like, and 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. Further, as the solvent contained in the drug as necessary, 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 for impregnating the different chemicals described above from the opposite surfaces of the raw wood is not particularly limited, but, for example, for the opposite surfaces A and B of the raw wood,
Examples include a method in which one of the different chemicals is attached to the A surface and the other chemical is attached to the B surface to impregnate it. 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 in solid form, it may be applied by sprinkling it on a wood surface. When the drug is in liquid form, 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. When the drug is a solution, the concentration and temperature of the solution are not particularly limited.

In the present invention, in addition to different drugs, other drugs capable of insolubilizing them by reacting with their soluble unreacted substances and by-products (hereinafter, simply referred to as "other drugs"). Is also impregnated into the raw material wood so as to insolubilize the soluble unreacted products and by-products and fix them in the wood. The substance constituting the other drug is appropriately selected depending on the types of soluble unreacted substance and by-product to be immobilized, and is not particularly limited, and examples thereof include inorganic substances such as magnesium chloride, and the like, Examples of the compound that reacts with phosphoric acid or hydrochloric acid to form an insoluble compound include guanidines.
However, the present invention is not limited thereto, and melamine-based or urea-based resins such as methylolmelamine, methylolacetoguanamine, methylolurea, and methylolethyleneurea can be used. Each of these is used alone or as a drug together with a solvent and the like, and as long as they do not react with each other in one drug, a plurality of types may be used in combination in one drug.

The shape of the other drug may be solid, liquid, solution or the like. The impregnation method is also not particularly limited, and for example, it may be attached to the surface of the wood, or the wood may be dipped in a solution-like chemical. When applied to a wood surface, the method of application may be similar to the different agents mentioned above. Regarding the timing of impregnation with other chemicals,
There is no particular limitation. For example, it may be carried out at the same time as the impregnation of different chemicals, or after impregnation of different chemicals, it may be carried out during the curing described later.

The number of impregnations with different agents and other agents is
It is not particularly limited. 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. Further, the treatment conditions such as impregnation treatment time and temperature are not particularly limited.

Prior to the first impregnation treatment with the chemicals, the raw wood was sufficiently impregnated with water or another solvent by subjecting the raw wood to water or another solvent in which the chemicals were dissolved. It is recommended to leave it in the state. This is because the drug component can be rapidly diffused and permeated into the wood using water or other solvent in the wood as a medium, and the processing time can be shortened. The solvent content rate of the raw material wood subjected to such a solvent-containing treatment is preferably 80% or more, and 100% based on the absolute dry weight of the raw material wood.
The above is more preferable. The method of solvent-containing treatment is not particularly limited, but for example, heat immersion, storage in water, steaming, impregnation under reduced pressure, impregnation under pressure, or the like is performed.

When the chemical is impregnated and reacted, it is preferable that the water or other solvent which is a medium in the wood is not volatilized so that the wood is not dried. The method is not particularly limited, and examples thereof include a method of sealing a raw material wood laminated with chemicals attached thereto. 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 curing treatment method include a method of giving a physical stimulus such as ultrasonic vibration, pressurization, radio waves, high frequencies, 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 treatment is not limited to these, and the curing treatment is performed under high temperature and high humidity or in a high temperature and high concentration atmosphere of a solvent other than water, and the chemical is dissolved or diluted with condensed water or other solvent to impregnate the wood. You may make it react. This method is an excellent method that enables the rapid impregnation of the drug without the solvent-containing treatment described above, and can also accelerate the reaction of the drug in the wood. Is effective when

The temperature, time, etc. of the curing treatment are not particularly limited. As described above, by stacking a plurality of raw material woods to which different chemicals are adhered alternately with the surfaces to which the chemicals are adhered facing in the same direction, the raw woods differ from the opposite surfaces. After impregnating the chemicals, the stacking method of the raw material woods may be changed as necessary so that the surfaces to which different chemicals are adhered are matched. When such an operation is performed, a large amount of insoluble compound can be produced in the wood surface layer part by contacting and reacting with the unreacted different chemicals remaining in the wood surface layer part in the wood surface layer part. The yield of the drug immobilized as an insoluble compound in wood can be improved. The timing of changing the stacking method of the raw material wood is not particularly limited, and examples thereof include a time when the chemical adhering to the wood surface is dissolved and impregnated into the wood.

After the insoluble compound is formed and fixed in the wood by the above impregnation treatment, the surface of the wood is washed with water and the like, if necessary, and dried to obtain modified wood.

[0043]

When different chemicals that react with each other to form an insoluble compound are impregnated from opposite surfaces of the raw material wood, there is no need to mix different chemicals that react with each other, and the usable time of the chemicals becomes long, and Since the reaction of the chemical agent occurs from the center of the wood without the reaction between the woods outside the wood, the wood can be efficiently and continuously modified. Then, even with a small amount of impregnation, a large amount of insoluble compound is formed and fixed even in the center of wood. Therefore, even if the surface of the obtained modified wood is processed, the loss of the insoluble compound can be small, so that the performance deterioration can be suppressed.

In the present invention, in addition to the above-mentioned different drugs,
The raw wood is also impregnated with other agents that may react with these soluble unreacted products and byproducts to insolubilize them. Then, soluble unreacted substances and by-products of different chemicals react with other chemicals to be insolubilized and fixed in the wood. Therefore, the weather resistance of wood such as moisture resistance and water resistance is improved, and it is also flame-retardant (fireproof) due to insoluble substances produced from soluble unreacted substances and by-products.
Etc., the performance is further improved. Further, since the treatment for removing soluble unreacted substances and by-products (leaching treatment) is unnecessary, the treatment efficiency is further improved.

[0045]

EXAMPLES Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. -Example 1-As raw material wood, a plurality of 1 mm-thick Agatisu rotary single plates (1 cm square) (1) and (2) that had been water-saturated in advance were prepared.

As a cation-containing drug on the upper surface of the single plate (1)
Barium chloride dihydrate (BaCl₂・ 2H₂O) 63
6 g / m²Of the veneer (2)
Ammonium hydrogen phosphate as anion-containing drug on top
((NH_Four)₂HPO_Four) 347 g / m ²The amount was evenly applied.
Place these veneers with the drug-spraying side facing up (1),
(2), (1), (2), (1), (2), (1),
Alternately stack in the order of (2), and spray the drug on the top.
Not mounted veneer (1). Dense the obtained single plate laminate
It was sealed and cured at 80 ° C. for 24 hours.

Thereafter, the laminate is once separated, and the veneer (2) on which the anion-containing drug has been sprayed is turned upside down, and dimethylolurea (as another drug) is added to each upper surface of the veneers (1) and (2). DMU) was evenly dispersed in an amount of 99 g / m ² , and then the single plates (1) and (2) were laminated and sealed,
Curing was performed at 60 ° C. for 24 hours. After completion of the curing, the single-layer laminate was separated, washed with water and dried to obtain modified wood.

-Examples 2-5 and Comparative Examples 1-2-In Example 1, the types and spraying amounts of the cation-containing drug and the anion-containing drug, the presence or absence of inversion of the veneer during curing, and the types of other drugs Modified wood was obtained in the same manner as in Example 1 except that the spraying amount and the curing conditions were as shown in Table 1 below. However, in Example 3, DMU was mixed with the anion-containing drug at the time of initially spraying the anion-containing drug onto the raw material veneer, and then sprayed onto the veneer. In addition, in Comparative Examples 1 and 2, other chemicals were not sprayed at all.

[0049]

[Table 1]

In the above Table 1, DMU stands for dimethylolurea and TMM stands for trimethylolmelamine. If the veneer is inverted during curing, the temperature and time of the curing treatment before and after the veneer is inverted are shown in two upper and lower columns (the upper column in each column is the one before inversion). Yes, the bottom is after inversion). The modified woods obtained in Examples 1 to 5 and Comparative Examples 1 and 2 described above were examined for impregnation rate, residual rate after leaching, and fire resistance.

The impregnation rate was determined according to the following formula. Impregnation rate (%) = {(W ₂ −W ₁ ) / W ₁ } × 100 (W ₁ represents the absolute dry weight of untreated wood, and W ₂ represents the absolute dry weight of treated wood.) The residual rate after leaching was determined according to the following formula from the impregnation rate before and after the leaching treatment by immersing the modified wood in water to leaching the soluble component. The higher the residual rate after leaching, the smaller the amount of soluble components contained in the wood before leaching.

Residual rate after leaching (%) = (impregnation rate after leaching) / (impregnation rate before leaching) × 100 Fire resistance is defined as x for fireproof of untreated plywood and fireproof for flame-retardant plywood. As ◯◯◯, evaluation was made in five stages of ×, Δ, ◯, ◯◯, and ◯◯◯. The results are shown in Table 2 below.

[0053]

[Table 2]

As shown in Table 2, the modified woods of Examples 1 to 5 have almost the same impregnation rate as compared with the modified woods of Comparative Examples 1 and 2, but the residual rate after leaching is high. It was confirmed that the fire resistance was excellent.

[0055]

According to the method for producing modified wood according to the present invention, there is no need to mix different chemical agents that react with each other,
The drug can be used only for a long time without any reaction between the drugs outside the wood, and a large amount of insoluble compounds can be efficiently and continuously produced with a small amount of impregnation in the wood. It is possible to generate and fix even parts. Therefore, modified wood having excellent antiseptic / insect repellent properties, flame retardancy, etc. can be obtained efficiently at low cost.

In the modified wood thus obtained, a large amount of the insoluble compound as the active ingredient is formed and fixed even in the central part of the wood, so that the loss of the insoluble compound is small when the surface of the wood is processed. As it is completed, the performance degradation can be suppressed. Further, in the production method of the present invention, it is possible to insolubilize soluble unreacted substances and by-products and fix them in wood,
The modified wood obtained will have improved weather resistance such as moisture resistance and water resistance, and will also have improved flame retardancy (fire resistance) due to insoluble substances formed from soluble unreacted materials and by-products. To do. Further, since the treatment for removing soluble unreacted substances and by-products (leaching treatment) is unnecessary, the treatment efficiency is further improved.

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

Claims (1)

[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 a modified wood, wherein the raw material wood is impregnated with a soluble unreacted substance of the different drug and another drug capable of reacting with the by-product to make them insoluble, And a method for producing modified wood, characterized in that the by-products are insolubilized and fixed in the wood.