JPH0671615A - Production of modified wood - Google Patents

Abstract

PURPOSE:To obtain a modified wood production method for realizing superior water resistance and moisture resistance, high fireproof properties, and the infiltration and reaction of agents without wasteful use in a treatment for modifying a wood under reaction of the agents in the wood. CONSTITUTION:In a modified wood production method, different agents which react with each other to produce an insoluble, incombustible and inorganic substance are applied to an opposed surface of a material wood to be modified, thereby being infiltrated. In this production method, at least three kinds of agents are used, i.e., at least two kinds of agents which react with each other to produce an insoluble, incombustible and inorganic substance and an agent reacting with a soluble by-product generated by the reaction to produce an insoluble, incombustible and inorganic substance.

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 a building material or the like.

[0002]

2. Description of the Related Art As a modification method for imparting flame retardance, antiseptic / insect proof, dimensional stability, water / moisture resistance, surface hardness, abrasion resistance, etc. to wood, a composite of wood and insoluble non-combustible inorganic material, Conventionally, compounding with a functional resin, chemical modification, chemical impregnation, etc. have been carried out. Composite with insoluble non-combustible inorganic material is mainly performed for the purpose of imparting flame retardancy, antiseptic / insect repellent property, surface hardness, and in the flame retardancy, modified wood reaching a quasi non-combustible level has been obtained. Wood is used as a material for fire doors and the like.

A composite with a functional resin is mainly used for the purpose of imparting water resistance / moisture resistance, surface hardness, strength, and abrasion resistance. The modified wood is generally used as a WPC for a wide range of floor materials and the like. Has been done. The chemical modification is mainly performed for the purpose of imparting dimensional stability and water / moisture resistance, and modified wood modified by acetylation is used as a material for water around bathtubs and the like.

Chemical impregnation is mainly carried out for the purpose of imparting antiseptic and insect repellent properties, and this modified wood is widely used. As described above, various wood reforming methods have been studied and implemented.The treatment methods are chemical impregnation by immersion in a chemical solution, chemical reaction / fixation in wood by repeated immersion, pressure reduction / pressure impregnation. It is implemented in a batch processing format.

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 was a problem that the pot life of the chemical solution was short. Further, since it is a batch processing type, there is a problem in that it is necessary to repeat the steps of producing a chemical solution and impregnating wood, and production efficiency is poor and it is difficult to enter the mass production process. The inventor has already found a method for solving such a problem. In other words, it is a method for producing modified wood in which different chemicals that react with each other to produce raw material wood to be modified to form insoluble and non-combustible inorganic substances are attached and impregnated from the surface facing the raw material wood. According to this method, it is not necessary to mix the agents that react with each other, the usable time of the agents is long, and the agents are reacted only in the wood without any reaction between the agents outside the wood, so that the wood can be efficiently used. It can be continuously modified, and since the reaction of chemicals starts from the center of wood, a large amount of active ingredients (insoluble non-combustible inorganic substances) are generated and fixed up to the center of wood. It is possible to obtain a modified wood which is less likely to deteriorate.

However, the above-mentioned improved method also has the following problems. Moisture resistance and water resistance are low due to the large amount of soluble by-products generated in wood. Difficult to produce insoluble non-combustible inorganic material sufficient to obtain a high degree of fire protection. Insoluble and non-combustible inorganic substances are formed outside the wood, resulting in a large loss of chemicals.

[0007]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has excellent water resistance and moisture resistance in a treatment for modifying a wood by reacting the chemical in the wood, has a high degree of fire resistance and a chemical. It is an object of the present invention to provide a method for producing modified wood in which wood is impregnated and reacted without waste.

[0008]

In order to solve the above-mentioned problems, the method for producing modified wood according to the present invention is different in that an insoluble non-combustible inorganic substance is produced by reacting with a raw wood to be modified. A method of impregnating the raw materials with the chemicals by adhering to the opposite surfaces of the raw material wood, wherein at least two chemicals that react with each other to form an insoluble non-combustible inorganic substance, and a soluble by-product formed by the reaction are further added. A method for producing a modified wood characterized in that at least three kinds of chemicals, that is, a chemical that reacts with a product to produce an insoluble non-combustible inorganic matter, are used.

The raw material wood for reforming used in the present invention is not particularly limited, and examples thereof include raw wood logs, lumber products, sliced veneer, plywood, etc. Is preferable. In addition, those tree species are not limited at all. Prior to the first impregnation treatment, it is preferable that the raw material wood be saturated with water so as to serve as a medium for the diffusion of the chemicals, and the medium is sufficiently impregnated in the wood. However, the present invention is not limited to this, and for example, after the chemical is attached to the desiccant, it may be allowed to diffuse and react by curing under high humidity. Here, examples of the pretreatment method include underwater storage, steaming, impregnation under reduced pressure, impregnation under pressure, and the like.

The insoluble non-combustible inorganic substance generated in wood and dispersed / fixed in the wood structure is not particularly limited, but, for example, as elements of the cation portion constituting the insoluble non-combustible inorganic substance, Mg, Ca, Sr, In addition to alkaline earth metals such as Ba, Fe, Cu, CO, Ni, Mn, P
b, Zn and the like. As the anion species, O
H, F, Cl, Br, NO ₃ , CO ₃ , BO ₃ , P
Examples thereof include O ₄ and SO _4, but are not limited thereto. Two or more kinds of these insoluble non-combustible inorganic materials may coexist in wood.

The drug used in the present invention is a different drug which reacts with each other to produce an insoluble non-combustible inorganic substance, and a drug which reacts with a soluble by-product produced in the reaction to produce an insoluble non-combustible inorganic substance. If present, it can be chosen at will depending on the composition of the desired insoluble, non-combustible mineral to be produced in the wood. For example, a cation-containing drug having the above cation and an anion-containing drug having the above anion are used.

After the raw material wood is saturated with water, a cation (or anion) -containing chemical is applied to one surface of the wood by spraying or the like and attached to another wood in the same manner as described above.
The contained chemicals are applied by spraying, etc., and the adhered surfaces of the chemicals are stacked in the same direction so that the chemicals are impregnated and reacted with the wood. It is preferable to prevent water, which is a medium in the wood, from volatilizing and drying during repeated reaction (curing treatment).

[0013] After that, a stack of the woods that have been reacted in a stacked manner is unwound, and a chemical agent that reacts with a by-product generated in the first reaction to form an insoluble inorganic material is attached to one surface of the wood, and the same surface is attached. Make them react in the same direction. Even if the reaction process is other than the above, a soluble by-product formed by the reaction of two or more kinds of drugs and a drug capable of reacting with the by-product to form an insoluble non-combustible inorganic substance There is no particular limitation as long as it reacts inside the wood.

For example, first, only the cationic agent is attached to one side of the wood, and after stacking and curing treatment, the stack is unwound and the anionic agent is attached to one side of the wood, and the opposite sides are Even if a chemical that reacts with the soluble by-product that is produced is attached and stacked in the same direction and impregnated and reacted inside the wood, the same inorganic reaction as described above can occur inside the wood.

To give an example of the inorganic reaction in the present invention, the wood on which barium chloride is attached to one side and the wood on which magnesium sulfate is attached to one side are alternately stacked and cured, and then the unstacked wood is removed. By attaching diammonium hydrogen phosphate on each side and stacking and curing wood again, the following reaction occurs inside the wood. In the formula, ↓ represents an insoluble non-combustible inorganic substance.

(Reaction 1) BaCl ₂ + MgSo ₄ → BaSo ₄ ↓ + MgCl ₂ (Reaction 2) MgCl ₂ + (NH ₄ ) ₂ HPO ₄ → MgHPO ₄ ↓ + 2NH ₄ Cl The above two-step reaction occurs inside the wood. By doing so, the amount of by-products in the obtained insoluble non-combustible inorganic substance and by-product is reduced, and the proportion of the insoluble non-combustible inorganic substance is increased. Therefore, an insoluble incombustible inorganic substance can be efficiently produced, and a high degree of fire resistance can be obtained.
Furthermore, since the amount of soluble by-products decreases, moisture resistance
Water resistance is improved.

During the curing of the inorganic reaction, the treatment can be made more efficient by promoting the diffusion / reaction of the drug by a method such as temperature or physical stimulation. Thereafter, if necessary, the surface of the wood is washed with water and dried to obtain modified wood. The modified wood obtained by the present invention is
Moisture resistance and water resistance are better than before, but in order to further improve the durability and weather resistance of wood, leaching treatment is carried out as necessary, and soluble unreacted chemicals or By-products and the like may be removed.

[0018]

In the present invention, since a chemical which reacts with a soluble by-product to produce an insoluble non-combustible inorganic substance is used, the amount of the by-product in the insoluble non-combustible inorganic substance and the by-product obtained is Decrease and increase the proportion of insoluble non-combustible inorganics. Therefore, the insoluble noncombustible inorganic substance can be efficiently generated. Furthermore, because the chemicals that react with each other to form insoluble non-combustible inorganic substances are attached and impregnated from the opposite sides of the raw wood, the reaction of the chemicals starts from the central part of the wood and a large amount reaches the central part of the wood. The active ingredient (insoluble non-combustible inorganic substance) can be produced and fixed.

[0019]

EXAMPLES Next, examples of the present invention will be compared with comparative examples.
It will be explained together. -Example 1-Barium chloride on a saturated 1 mm wood of Agathis rotary
39 g / scale of dihydrate ²(Measure²= 0.303m x 0.3
03m, same below. ) Disperse it and use another sulfuric
19g / gnesium²After spraying, apply them to the drug
Layered alternately with the sprinkled side up, at 60 ° C
Sealed and cured for 24 hours. After that, the laminated veneers are
Tumble and diammonium hydrogen phosphate 9 on each laminated surface
g / measure²Scatter and then cure at 60 ℃ for 16 hours
It was After the curing treatment, it was washed with water and dried to obtain modified wood.

-Examples 2-10- Modified wood was obtained by the same treatment method as in Example 1. Detailed conditions are shown in Tables 1 and 2.

[0021]

[Table 1]

[0022]

[Table 2]

-Comparative Examples 1 to 3-Implemented under the conditions shown in Table 3.

[0024]

[Table 3]

The modified woods obtained in the above Comparative Examples and Examples were examined for impregnation rate, hygroscopicity and flame retardancy. The impregnation rate was determined according to the following formula. Impregnation rate _{(%) = {(W 2} -W 1) / W 1} × 100 ( wherein, W ₁ represents the total dry weight of the untreated wood, W ₂ represents the total dry weight of the treated wood.) About hygroscopicity 5 cm
Evaluation was performed using a plywood having a corner and a thickness of 5 mm. As a moisture absorption operation, 40 ° C., 75% condition for 48 hours, then 40
The condition was kept at 90 ° C. and 90% for 24 hours, and the weight increase at that time was measured. The weight increase of which is equal to or more than the flame-retardant plywood is represented by x, the equivalent of the flame-retardant plywood is represented by Δ, and the equivalent of the untreated plywood is represented by o.

Regarding flame retardancy (fireproofness), JISA-
A surface combustion test based on 1314 was performed, and those having performance equivalent to the flame retardant class 3 were represented by Δ, and flame retardant class 2 equivalent was represented by ◯. The results are shown in Table 4.

[0027]

[Table 4]

As shown in Table 4, hygroscopicity is improved by applying spraying 1, spraying 2 and two-step spraying treatment, reacting the produced soluble by-product to insolubilize it. In the spraying treatment in which the two-step reaction is not carried out as in Comparative Examples 1 and 2, the modified wood obtained has a low impregnation rate and a large amount of soluble by-products are present inside the wood. Therefore, the amount of moisture absorption becomes large, and the result is that the amount of moisture absorption is higher than that of flame-retardant plywood.

Regarding the fireproof property, all of the examples have a high fireproof performance of class 3 or higher in flame retardance, and those having an impregnation rate of 70% or higher are class 2 in flame retardance (quasi-incombustible). It was found that it has almost the same performance as.

[0030]

According to the method for producing modified wood according to the present invention, a large amount of insoluble noncombustible inorganic material can be efficiently produced in wood. In the modified wood obtained, a large amount of insoluble non-combustible inorganic substance, which is the active ingredient, is generated up to the center of the wood.
Since it has been fixed, the amount of insoluble non-combustible inorganic matter can be reduced when processing the surface of the wood, so that deterioration in performance can be suppressed. In addition, the modified wood obtained has a large amount of insoluble non-combustible inorganic material, and thus high fire resistance can be obtained. On the other hand, since the amount of soluble by-products is reduced, the moisture resistance and water resistance are improved.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Ryusuke Honda 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (4)

[Claims] 1. A method for producing modified wood in which different chemicals that react with each other to produce raw wood to be modified to produce insoluble non-combustible inorganic substances are attached to opposite surfaces of the raw wood to impregnate them. And at least two kinds of agents that react with each other to form an insoluble noncombustible inorganic substance, and further, an agent that reacts with a soluble by-product generated in the reaction to form an insoluble noncombustible inorganic substance,
A method for producing modified wood, characterized in that at least three kinds of chemicals are used. 2. One of different chemicals which react with each other to form an insoluble non-combustible inorganic substance is attached to one side of raw wood, and the other is attached to one side of another wood. The method for producing modified wood according to claim 1, further comprising a step of impregnating and reacting with the chemical by alternately stacking the chemicals in the same direction. 3. An agent which reacts with each other to form an insoluble non-combustible inorganic substance, wherein the cationic species is Sr, Mg, Ca,
A metal ion (cation) -containing drug that is at least one of Ba, Al, and Zn, and the anion species are PO ₄ , SO
The method for producing modified wood according to claim 1 or 2, wherein an anion-containing drug that is at least one of ₄ , BO ₃ , CO ₃ , and OH is used. 4. Among the agents used, at least one or a part of the agents containing metal ions (cations) is at least one of water-soluble oxides, hydroxides and carbonates. A method for producing the modified wood described.