JPH0639810A - Manufacture of modified wood - Google Patents

Abstract

PURPOSE:To provide a manufacturing method for modified wood wherein improvement of an insoluble compound content and effectiveness of production are attempted in a manufacturing method of the modified wood wherein the insoluble compound is generated and fixed by allowing a cation-containing compound to react with an anion-containing compound in the wood. CONSTITUTION:In a manufacturing method wherein after dispersing in powder a cation-containing compound and an anion-containing compound which generate an insoluble compound by allowing them to react with each other on opposed surfaces of solvent-permeated raw material wood, they are impregnated therewith, at least either of the cation-containing compound or the anion-containing compound is heated when it is solved in the solvent.

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 building materials and the like.

[0002]

2. Description of the Related Art Conventionally, an insoluble non-combustible inorganic substance has been used as a modification method for imparting flame retardancy, antiseptic / insect resistance, dimensional stability, water / moisture resistance, surface hardness, mechanical strength, and abrasion resistance to wood. Methods such as compounding with, functional compounding, chemical modification by chemical bonding, and impregnation of chemicals such as preservatives have been carried out.

The compounding with the insoluble non-combustible inorganic material is mainly carried out for the purpose of imparting flame retardancy, antiseptic / insect repellent property, and surface hardness, and among them, especially for flame retardancy, modification reaching a quasi non-combustible level. Wood has been obtained and is used as a material for fire doors and the like. The compounding with the above-mentioned functional resin is performed mainly for the purpose of imparting water / moisture resistance, surface hardness, mechanical strength, and abrasion resistance, and generally WP
Widely known as C. The chemical modification by the above-mentioned chemical bonding is mainly performed for the purpose of imparting dimensional stability and water / moisture resistance. For example, modified wood by acetylation is used as a water supply material for bathtubs and the like. Also,
The chemical impregnation is mainly performed for the purpose of imparting antiseptic / insect repellent properties and is widely used.

In the composite with the insoluble incombustible inorganic material, for example, as disclosed in JP-A-61-246003, a cation and an anion which react with each other to form an insoluble compound are separately contained. The two kinds of aqueous solutions are sequentially impregnated into the raw material wood,
It is known to modify wood by producing and fixing insoluble compounds. However, in this method for modifying wood, since the reaction between the cation-containing compound and the anion-containing compound occurs outside the wood, an insoluble compound is produced in the aqueous solution in the immersion tank, resulting in a change in the composition of both aqueous solutions. was there.

A solution to the above problems has been found. For example, there is a method in which a cation-containing compound and an anion-containing compound are sprayed on the opposite surfaces of the wood to be modified, and then an insoluble compound is generated and fixed in the wood. According to this method, since the reaction between the cation-containing compound and the anion-containing compound occurs from the center of the wood, a modified wood having a high concentration of the insoluble compound in the center can be obtained, but the cation-containing compound and the anion-containing compound are added to the wood. With the increase in the impregnated amount of the compound, it is required to improve the productivity due to the formation and fixation of the insoluble compound.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned facts, and an object thereof is to react a cation-containing compound and an anion-containing compound in wood to produce and fix an insoluble compound. In the modified wood producing method, the content of the insoluble compound is improved and the production efficiency is improved.

[0007]

The method for producing a modified wood according to the present invention comprises the steps of adding a cation-containing compound and an anion-containing compound which react with each other to a raw wood infiltrated with a solvent to produce an insoluble compound. At least one of the cation-containing compound, or the anion-containing compound, in the method for producing modified wood in which the insoluble compound is generated and fixed in the wood by being impregnated after being sprayed in a powder form on the opposite surfaces of the raw wood. Is a compound that generates heat when dissolved in the above solvent.

[0008]

According to the present invention, at least one of the cation-containing compound and the anion-containing compound used generates heat when dissolved in the solvent. To rise. For example, if the anion-containing compound dissolves and generates heat, the temperature of the solvent also rises, and the other cation-containing compound also dissolves in the solvent to increase the impregnation of wood. When the impregnation of the cation-containing compound and the anion-containing compound progresses, the reaction of the above compounds is promoted and the insoluble compound is efficiently produced in the wood.

The present invention will be described in detail below. The shape of the raw material wood for reforming used in the present invention is not particularly limited, and for example, log logs, lumber products, sliced veneer, plywood, etc. are used, and the surface impregnated with the agent is compared with the volume of wood. And a wider one is preferable. There is no limitation on the species of the raw wood.

In the present invention, a raw material wood is prepared by impregnating the raw material wood with a solvent such as water prior to impregnation with the cation-containing compound and the anion-containing compound. In this case, permeation to a saturated state is effective for improving the impregnation of the above compound into wood. The permeation rate of the solvent into the raw wood is preferably 80% or more, more preferably 100% or more, based on the absolute dry weight of the raw wood. The method of permeating the solvent is not particularly limited, and examples thereof include heat immersion, storage in water, steaming, impregnation under reduced pressure, and impregnation under pressure.

In the present invention, the insoluble compound produced and fixed in the wood is not particularly limited, but it is determined according to the purpose of modification. When a nonflammable insoluble compound is produced, wood is rendered flame retardant, and when an insect repellent insoluble compound is produced, wood is rendered insect repellent. For example, for flame retardancy, examples include borate, phosphate, hydrogen phosphate, carbonate, sulfate, hydrogen sulfate, silicate, nitrate, and hydrohydrate. In order to generate and fix the insoluble compound in wood, a cation-containing compound containing a cation species forming the cation part of the insoluble compound and an anion containing compound containing an anion species forming the anion part of the insoluble compound are prepared. You can use it. The cation-containing compound and the anion-containing compound react with each other to produce an insoluble compound.

Constituting the cation part of the insoluble compound
The cation species is not particularly limited, for example,
Alkaline earth metal ions such as Mg, Ca, Sr and Ba,
Al, Fe, Cu, Co, Ni, Mn, Pb, Zn, etc.
Metal ions are mentioned. Also, the insoluble compound anio
There is no particular limitation on the type of anion that constitutes the inner part.
But, for example, OH^-, F^-, Cl^-, Br^-, NO₃
^-, CO₃ ^2-, BO₃ ^2-, PO_Four ^3-, SO_Four ^2-Etc.
To be

A powdery compound is used as the cation-containing compound and the anion-containing compound, and at least one of the two compounds must be a compound that generates heat when dissolved in the solvent. The cation-containing compound and the anion-containing compound are not particularly limited, but for example, MgSO ₄ , MgCl ₂ , Zn
Cl ₂ , AlCl ₃ , CaSO _4, etc. are suitable. These cation-containing compound and anion-containing compound are arbitrarily selected according to the composition of the desired insoluble compound to be generated in wood. In selecting the above-mentioned cation-containing compound and anion-containing compound, a combination is preferred in which an insoluble compound is easily produced in wood.

The method of impregnating the above-mentioned cation-containing compound and anion-containing compound in a powder form on the opposite surfaces of the above-mentioned raw wood and impregnating them is not particularly limited. The raw material wood and the raw material wood which has been sprayed with the anion-containing compound on one side, the surface of the compound is directed in the same direction, the raw material wood and the anion-containing compound sprayed cation-containing compound was sprayed There is a method of performing curing by alternately stacking raw material wood, and this method is effective as an industrial method that can cure a plurality of raw material wood at a time and has good production efficiency.

When impregnating the compound, it is preferred that the solvent in the wood not volatilize and the wood not dry. This method is not particularly limited, and examples thereof include a method of sealing a raw material wood onto which the compound has been dispersed with a sheet.

Since at least one of the cation-containing compound and at least one of the anion-containing compounds generates heat when dissolved in the solvent, the temperature of the solvent that has penetrated into the raw material wood rises and the impregnation of the compound is promoted. Since the reaction of the above compounds proceeds, insoluble compounds can be produced and fixed in wood with good production efficiency.

In order to improve the durability and weather resistance of the modified wood, the modified wood thus obtained may be immersed in water or another suitable solvent, if necessary, and left in the wood. The soluble unreacted compounds, by-products and the like may be removed.

After the impregnation of the cation-containing compound and the anion-containing compound and the production / fixing of the insoluble compound have been completed, the surface of the wood is washed with water, if necessary, and dried to obtain the desired modified wood. obtain.

[0019]

EXAMPLES Examples and comparative examples of the present invention will be given below.

Example 1 As raw material wood, water was previously used as a solvent to make it saturate.
1 mm thick Agatisu rotary veneer (1 cm square) (1)
A plurality of sheets of (2) and (2) were prepared.

Barium chloride (BaCl ₂ .2H ₂ O) as a cation-containing compound was uniformly sprayed on the upper surface of the veneer (1) at a rate of 588 g / m ^{2 in} the powder state, and the veneer (2) 283 g of magnesium sulfate (MgSO ₄ ) in the form of powder as an anion-containing compound on the upper surface of
/ M ² and sprayed uniformly. (1), (2), (1) ...
.. were alternately laminated in this order, and a veneer on which the compound was not sprayed was placed on the top. The resulting veneer laminate is sealed and 2
It was aged at room temperature of 5 ° C. for 24 hours. After curing, wash with water,
Modified wood was obtained through drying.

The content of the insoluble compound and the flame retardancy of the obtained modified wood were examined. The content rate was obtained according to the following formula.

Content (%) = {(W ₂ −W ₁ ) / W ₁ } × 100 W ₁ represents the absolute dry weight before permeating the solvent.

W ₂ represents the absolute dry weight of the obtained modified wood. Regarding the flame retardancy, a surface combustion test based on JIS-A-1321 was conducted, and those having performance equivalent to the flame retardant class 2 were represented by ◯, and those having performance equivalent to the flame retardant class 3 were represented by Δ. The results are shown in Table 2.

Examples 2 to 5 and Comparative Examples 1 to 3 In Example 1, the types and thicknesses of the veneer, the types and spraying amounts of the cation-containing compound and the anion-containing compound, and the curing conditions are shown in Table 1 below. Modified wood was obtained in the same manner as in Example 1 except for the above.

The content of the obtained modified wood and the flame retardancy were examined in the same manner as in Example 1. The results are shown in Table 2.

[0027]

[Table 1]

[0028]

[Table 2]

Although Example 1 and Comparative Example 1 differed in the type and spray amount of the cation-containing compound and the anion-containing compound, although Example 1 and the curing conditions were the same, a higher content was obtained in Example 1. The flame resistance was also excellent. This is Mg
This is because the temperature of the veneer surface increased to 60 ° C. due to the heat of dissolution of SO ₄ , and the impregnation and reaction of the cation-containing compound and the anion-containing compound were promoted. Also in Examples 2 to 5, a high content rate was obtained, flame retardancy was also excellent, and the heat of fusion increased the surface temperature of the veneer, and the impregnation and reaction of the cation-containing compound and the anion-containing compound were promoted. It is due to the fact. On the other hand, in Comparative Examples 2 and 3, heating was performed at 80 ° C. as a curing condition, but the cation-containing compound and the anion-containing compound of the dispersed powder were externally heated, so that the compound was the surface of the single plate Not only was the whole melted out in a liquid state, but before it was impregnated into the veneer, it was washed away outside the veneer, and the content rate as high as that of the example was not obtained.

[0030]

According to the production method of the present invention, since at least one of the cation-containing compound and the anion-containing compound to be sprayed on the raw material wood is a compound which generates heat when dissolved in the above solvent, it is heated from the outside. Without doing
Impregnation and reaction of the cation-containing compound and the anion-containing compound into the wood are promoted, and the content of the insoluble compound is improved.

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

Claims (2)

[Claims] 1. A raw material wood infiltrated with a solvent is impregnated with a cation-containing compound and an anion-containing compound, which react with each other to produce an insoluble compound, in a powder form on opposite surfaces of the raw material wood. Thus, in the method for producing modified wood in which the insoluble compound is generated and fixed in the wood, at least one of the cation-containing compound and the anion-containing compound is a compound that generates heat when dissolved in the solvent. A method for producing modified wood characterized by the following. 2. A raw material wood in which the cation-containing compound is sprinkled on one side of a raw material wood, an anion-containing compound is spread on one side of another raw material wood, and the cation-containing compound is sprinkled in the same direction. 6. The cation-containing compound and the anion-containing compound are impregnated, and the insoluble compound is produced and fixed by alternately curing and curing the raw wood material on which the anion-containing compound is sprayed. Of modified wood in Japan.