JPH10211605A - Antiseptic treating method of wooden product and antiseptically treated wooden product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the antiseptic treating method of a wooden product, which has an antiseptic action over a long period of time and can protect against decay neither impairing fine external appearance nor having the fear for exert a bad influence upon a human body and an environment. SOLUTION: Urea, methylolmelamine or THPC is selected, for example, as a synthetic resin stock. In a solution, which is prepared by mixing and dissolving the above-mentioned synthetic resin stock with and into Mapomase OT (a surfactant) and ammonium chloride, a wooden product is immersed for a proper period of time and then pulled out of the solution so as to be dried and subjected to a required heat treatment for a predetermined period of time such as 170 deg.C for 2min in order to realize the chamical bonding between cellulose, hemicellulose or lignin and the synthetic resin stock and a resinification of the synthetic resin stock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preserving a wooden product such as a wooden pillar, a wooden board or wooden furniture, and a preservative-treated wooden product.

[0002]

2. Description of the Related Art Wood is cut as it is from a log or from a log into a perfect circle, or after being sawn, dried and cut, and further subjected to processes such as chemical treatment, bonding, and painting as required. Processed into wood products. The chemical treatment uses creosote oil-based chemicals for preservation, chlordane-based, fluoride-based, or boron-based chemicals for insect repellency, and applies these chemicals to the intermediate product, immerses or Immerse and pressurize.

[0003]

However, in the case of conventional wood products which have been treated with a chemical, the preservation and insect repellency are low, so that the chemical treatment must be repeated at intervals of several years, and the cost required for the chemical treatment is high. There was a problem that was high. In addition, there is a case where the color is discolored only in the portion that has been subjected to the chemical treatment, and there is a problem that the appearance is impaired. On the other hand, there is a problem that a drug harmful to the human body is used, so that it cannot be used in a portion that comes into contact with humans. In addition, chemical-treated wood products are used as a base material of a house, but when assembling the base material, an operator has to pay great attention to handling so that the base material does not come into contact with the skin. In addition, there is a risk that the chemicals may evaporate or elute from the wooden product, adversely affecting the environment and the human body.

The present invention has been made in view of the above circumstances, and an object of the present invention is to impregnate a wooden product with a solution containing a synthetic resin raw material that is chemically bonded to a wooden component.
By heating the wood product to perform the chemical bonding and the resinification of the synthetic resin raw material to perform preservative treatment, it has a preservative action for a long time, does not impair the aesthetic appearance, and may adversely affect the human body and the environment. It is an object of the present invention to provide a method for preserving a wood product, which can prevent decay, and a wood product subjected to a preservative treatment.

[0005]

According to a first aspect of the present invention, there is provided a method for preserving a wood product, wherein the wood product is impregnated with a solution containing a synthetic resin raw material which is chemically bonded to a component of the wood, and the wood product is heated to form the chemical bond. And a preservative treatment by converting the synthetic resin material into a resin.

[0006] The method for preserving wood products according to the second invention is as follows.
The first invention is characterized in that one or more chemical substances selected from the group consisting of urea, melamine, acrylamide, polyvinyl urethane and derivatives thereof are used as the synthetic resin raw material.

A method for preserving wood products according to the third invention is as follows.
In the first or second invention, the synthetic resin raw material is characterized by using a material having three or more functional groups.

[0008] A method for preserving wood products according to a fourth aspect of the present invention comprises:
The first, second or third invention is characterized in that a synthetic resin material having flame retardancy is used.

A method for preserving wood products according to a fifth aspect of the present invention
In any one of the first to fourth inventions, a solution to which a penetrant is added is used.

A preservative treated wood product according to a sixth aspect of the present invention is to impregnate a wood product with a solution containing a synthetic resin raw material that chemically bonds to the constituents of the tree, and heat the wood product to convert the chemical bond and the synthetic resin raw material into resin. It is characterized in that it is preservatively treated.

The preservative-treated wood product according to a seventh invention is the preservation-treated wood product according to the sixth invention, wherein one or more chemical substances selected from the group consisting of urea, melamine, acrylamide, polyvinyl urethane and derivatives thereof are used as the synthetic resin raw material. It is characterized by having.

The process of decay of a wooden product is generally as follows. The main components of the plurality of cells forming the wood product are lignin, cellulose and hemicellulose, and each cell has a structure in which lignin surrounds the cellulose and hemicellulose filamentous molecules. Lignin has a strong structure in which propylbenzene compounds are polymerized in a three-dimensional network. It protects itself against rot fungi that produce enzymes (cellulases, hemicellulases)

However, in the sawn wood product, a part of the lignin is peeled off by the physical action at the time of sawing to expose cellulose and hemicellulose, and the exposed portion is decomposed by rot fungi. The decomposition rate by this rot fungus is
The higher the temperature and humidity of the wood product environment, the faster it accelerates. Also, when termites cause damage to wooden products, or when wooden products are damaged by collision and scratching, portions where cellulose and hemicellulose are exposed are formed, and the exposed portions are decomposed by rot fungi. On the other hand, protozoa or bacteria producing cellulases and hemicellulases coexist in the digestive tract of termites, and the wood chips eaten by the termites are decomposed by them and eventually absorbed by the termites as nutrients.

As described above, the inventor of the present invention has conducted intensive studies focusing on the fact that the decomposition of cellulose and hemicellulose by enzymes plays a large role in the decay of wood products. By cross-linking between them with a synthetic resin, even when the bond between each sugar molecule (glucosidic bond) is dissociated by the action of an enzyme, the complex of cellulose and hemicellulose and the synthetic resin is prevented from being reduced in molecular weight, It has been found that a preservative effect can be obtained by this.

In the first, second, sixth and seventh inventions, synthetic resin raw materials such as urea and its derivatives (eg, methylol urea) and melamine and its derivatives (eg, methylol melamine) are cellulose, hemicellulose. And a chemical bond (eg, a C—N bond) with the constituent molecules of lignin, while forming a resin by condensation of urea or melamine with another synthetic resin raw material (eg, formaldehyde) or copolymerization of urea and melamine. A solution in which various synthetic resin raw materials are dissolved is impregnated into a wooden product by an immersion method or an immersion pressure method, and the wooden product is heated to perform the above-described chemical bonding and resinification.

As a result, the wood product is covered with a complex of cellulose, hemicellulose or lignin and a synthetic resin, and has a preservative effect over a long period of time by a single treatment. Urea and its derivatives are inexpensive, and melamine and its derivatives have flame retardancy. In addition, even if the termites cause damage or damage, if they are within a certain range impregnated with the solution, rot by rot fungi is prevented. In addition, wood chips eaten by termites
Because it is the above-mentioned complex, protozoa or bacteria coexisting with termites cannot be decomposed and do not become nutrients of termites,
Termites repel wooden products. On the other hand, since the resin is colorless and transparent, the appearance of the wood product before and after the treatment is substantially the same. Furthermore,
The synthetic resin formed by heating does not volatilize or elute, and does not adversely affect the environment and the human body.

In the third invention, since a synthetic resin material having three or more functional groups, for example, melamine, is used as the synthetic resin material, the synthetic resin has a three-dimensional network structure, and the reduction of the molecular weight is further prevented.

In the fourth invention, melamine, tetrakishydroxymethylphosphonium chloride (THP
C: (HOCH ₂ ) ₄ PCl) or N-methyloldimethylphosphonopropionamide (NDPP: C ₆ H ₁₄₎
NO ₃ P) or other flame-retardant synthetic resin raw material is used. Thereby, in addition to the preservative property, the flame retardancy can be given to the wooden product.

In the fifth invention, since the solution to which the penetrant is added is used, the penetrating power of the solution into the wooden product is high, and the solution can be impregnated into the wooden product to a required depth by the immersion method.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. A solution is prepared by dissolving a synthetic resin raw material, a penetrant, and ammonium chloride as a polymerization initiator in water as a solvent. As the synthetic resin raw materials, for example, those described in the following Table 1 can be used, and among them, used alone or in combination with an appropriate synthetic resin raw material. Further, as the penetrant, for example, Marpomerse OT (Matsumoto Yushi Seiyaku Co., Ltd.) containing a dialkyl sulfosuccinate emulsifier and a penetrant can be used. The synthetic resin raw materials applicable to the present invention are not limited to those shown in Table 1, and synthetic resin raw materials capable of chemically bonding with cellulose, hemicellulose or lignin,
Although all synthetic resin raw materials related to curing and resinification initiation can be used, it is preferable to use thermosetting synthetic resin raw materials among them.

[0021]

[Table 1]

The above-mentioned solution is prepared as follows. For example, when urea, methylol melamine and THPC are selected as synthetic resin raw materials, and marpomase OT and ammonium chloride are mixed with the same, marpomase OT is dropped into water as a solvent, a required amount of urea is added, and the mixture is stirred and dissolved. After that, ammonium chloride is added and dissolved by stirring. To this, a required amount of methylolmelamine is added and dissolved by stirring, and then THPC is added and dissolved by stirring. If it does not dissolve in this order, the solution may become cloudy, in which case the penetration of the solution into the wood product and the conversion of the synthetic resin raw material into resin do not proceed well.

The wooden product is immersed in the solution prepared as described above for an appropriate period of time, and the wooden product taken out of the solution is dried. Then, a required heat treatment is performed for a predetermined time (for example, 170 ° C.-2).
Minutes), the chemical bonding between cellulose, hemicellulose or lignin and the synthetic resin raw material and the conversion of the synthetic resin raw material into resin are performed.

As a result, the wood product is covered with the complex of cellulose, hemicellulose or lignin and the synthetic resin, and is not decayed by decay fungi. Further, even when termite damage or damage is caused, if it is within a range impregnated with the solution, decay by rot fungi is prevented. Furthermore, since the wood chips eaten by termites are the above-described complex, protozoa or bacteria coexisting with the termites cannot be decomposed and do not become nutrients of the termites, so the termites are repelled. On the other hand, since the resin is colorless and transparent, the appearance of the wood product before and after the treatment is substantially the same. In addition, the resin formed by heating does not volatilize or elute, and does not adversely affect the environment and the human body.

Further, the urea resin and the melamine resin have water resistance and weather resistance, so that wood products can be used even in a high-temperature and high-humidity environment that cannot be used due to decay. Moreover, since melamine resin is excellent in friction resistance, when melamine resin is used, the wood product is less likely to be damaged, the preservative action is further improved, and the useful life of the wood product is prolonged.

On the other hand, melamine resin, THPC, NDPP
Is flame-retardant, so if these are used, wood products can be given not only preservative properties, but also flame-retardant properties.If such a wooden product is used to build a house, High safety. By the way, when an organic solvent is used as the solvent, the organic solvent may remain in the wooden product,
In this case, the organic solvent may volatilize from the wooden product and adversely affect the environment and the human body. However, since water is used as the solvent, such a fear does not occur.

It is also possible to impregnate a wooden product by a pressure injection method without adding a penetrant to a solution in which a synthetic resin material is dissolved. However, when a penetrant is added, as described above,
Wood products can be impregnated with the solution by the dipping method,
Processing costs can be reduced.

[0028]

Next, the results of a comparative test will be described. (Example 1) A few drops of Marpomerse OT are added to 70 ml of water, 3 g of urea is added and dissolved by stirring, and a small amount of ammonium chloride is added and dissolved by stirring. After adding 7 g of methylol melamine (Sumitomo Chemical Co., Ltd.) and stirring and dissolving, 5 g of THPC was added and dissolved by stirring.
The solution A was prepared to be 00 ml.

After about 1 g of cedar or cypress sawdust is suspended in the solution A, the solution A is left standing at room temperature for about 30 seconds to impregnate the sawdust with the solution A. The sawdust was separated from the solution A, air-dried, and then heat-treated at 170 ° C. for 2 minutes. The treated sawdust and the untreated sawdust treated in this manner are placed in separate test tubes little by little, and 1% enzyme (cellulase: Wako Pure Chemical Industries, Ltd.)
After 10 ml of the solution was dispensed and subjected to an enzymatic reaction at pH 4.0 and 40 ° C. for 4 hours, glucose in each supernatant was detected with a urine sugar test paper (Terumo Corporation: Uriace).

As a result, 50 to 100
mg / dl glucose was detected. On the other hand, no glucose was detected from the treated sawdust. Thus, it can be seen that the treated sawdust has a sufficient preservative action. In addition,
It has been confirmed that the same effect can be obtained as long as the heat treatment is performed at 170 ° C. for 1.5 minutes or more. 150 ° C
By performing a heat treatment for 3 minutes, 160 ° C. for 2 minutes, and 180 ° C. for 30 seconds, a sufficient preservative action was obtained.

(Example 2) The treated sawdust obtained in Example 1 was pulverized using a mortar, and an enzymatic reaction was carried out as before.
Glucose concentration was measured with urine test paper. As a result, no glucose was detected. From this, it can be seen that even if a scratch occurs after the treatment, it does not rot.

Example 3 Next, it was examined whether or not a preservative effect can be obtained by performing the same treatment as above even when only cellulose is used. The following solutions were prepared in addition to Solution A. To 70 ml of water, 3 g of urea is added and dissolved by stirring, and a small amount of ammonium chloride is added and dissolved by stirring.
7 g of methylol melamine is added thereto and dissolved by stirring.
Solution B was prepared by adding water to 100 ml. Also,
100 g of solution C was prepared as before using 1 g of urea, 1 g of methylolmelamine, 1 g of acetic acid, a trace amount of ammonium chloride and Marpomase OT. Further, 100 g of solution D was prepared in the same manner as described above using 1 g of urea, 1 g of methylolmelamine, 1 g of NDPP, a trace amount of ammonium chloride, and merpomase OT. Further, 100 g of solution E was prepared in the same manner as above using 5 g of methylol melamine, a trace amount of ammonium chloride, and merpomase OT.

Dispense solutions A, B, C, D and E into separate test tubes. Each piece of filter paper was immersed in each test tube, and after drying each piece of filter paper, heat treatment was performed at 170 ° C. for 2 minutes. The treated filter paper piece and the untreated filter paper piece thus treated are inserted into separate test tubes, and 10 ml of a 1% enzyme solution is dispensed.
After an enzymatic reaction at pH 4.0 and 40 ° C. for 24 hours, glucose in each supernatant was detected with a urine sugar test paper.

As a result, the untreated filter paper strip after the enzyme treatment was disintegrated, and the supernatant contained 2,000 mg / glucose.
dl was detected. On the other hand, the shape of each treated filter paper piece after the enzyme treatment was the same as that before the enzyme treatment, and glucose was not detected from each supernatant.

Example 4 Further, the effect of the rot fungus on cellulose was examined. Filter paper pieces having a size of 1.5 × 10 cm were preserved using solutions A and B. Each of three test tubes was filled with rice-sized soil collected from a forest area, and each test tube was charged with potassium hydrogen phosphate 1 g / l,
Sodium nitrate 0.5g / l, magnesium sulfate 0.5
g / l, potassium chloride 0.5 g / l, ferric sulfate 0.0
15 g of 1 g / l inorganic liquid medium (without pH adjustment)
After dispensing 1 l each, the soil was suspended well. In these test tubes, treated filter paper pieces preserved by solutions A and B,
Untreated filter paper of the same size as the treated filter paper
Approximately 3 came out into the air, and 2/3 were inserted so as to be immersed in an inorganic liquid medium, and allowed to stand at room temperature in the dark for 7 days.

A plurality of types of decay fungi inhabit the soil in the forest area. These decay fungi are anaerobically cultured in an inorganic liquid medium, and a group of enzymes including cellulase, hemicellulase, etc. is added to the inorganic liquid medium. Produced in Untreated filter paper pieces were decomposed by this group of enzymes, and the part immersed in the inorganic liquid medium was broken. On the other hand, no significant change was observed in any of the two types of treated filter paper pieces.

[0037]

As described above in detail, in the first, second, sixth and seventh inventions, decay is prevented by a complex of cellulose, hemicellulose or lignin and a synthetic resin for a long period of time. Has antiseptic action. In addition, even if the termites cause damage or damage, if they are in a range impregnated with the solution, rot by rot fungi is prevented. Furthermore, since the wood chips eaten by the termites are the above-described complex, protozoa or bacteria that coexist with the termites cannot be decomposed and do not become nutrients of the termites, so the termites are repelled. On the other hand, since the resin is colorless and transparent, the appearance of the wood product before and after the treatment is substantially the same. In addition, the resin formed by heating does not volatilize or elute, and does not adversely affect the environment and the human body.

Further, the urea resin and the melamine resin have water resistance and weather resistance, so that wood products can be used even in a high-temperature and high-humidity environment which cannot be used due to decay. Moreover, since melamine resin is excellent in friction resistance, when melamine resin is used, the wood product is less likely to be damaged, the preservative action is further improved, and the useful life of the wood product is prolonged.

According to the third aspect of the invention, the synthetic resin has a three-dimensional network structure, which further prevents the reduction of the molecular weight and improves the preservative action.

In the fourth invention, since a flame-retardant synthetic resin raw material is used, flame retardancy can be imparted to a wooden product in addition to preservative properties. When a house is constructed using such a wooden product. The safety of the house is high.

In the fifth invention, since a solution containing a penetrating agent is used, the penetrating power of the solution into the wooden product is high, and the solution can be impregnated into the wooden product to a required depth by an immersion method. The invention has excellent effects.

Claims (7)

[Claims] 1. A method of impregnating a wood product with a solution containing a synthetic resin raw material that chemically bonds to a constituent component of the wood, and heating the wood product to convert the synthetic resin material into a resin. A method for preserving wood products, characterized by the following. 2. The method for preserving wood products according to claim 1, wherein one or more chemical substances selected from the group consisting of urea, melamine, acrylamide, polyvinyl urethane and derivatives thereof are used as the synthetic resin raw material. 3. The method of preserving wood products according to claim 1, wherein said synthetic resin material has three or more functional groups. 4. A method for preserving wood products according to claim 1, wherein said synthetic resin material is a material having flame retardancy. 5. The method according to claim 1, wherein a solution to which a penetrant is added is used.
5. The method for preserving wood products according to any one of claims 1 to 4. 6. A wood product is impregnated with a solution containing a synthetic resin raw material that chemically bonds to the constituents of the wood, and the wood product is heated to perform the chemical bonding and the resinification of the synthetic resin raw material to perform preservative treatment. Preservative-treated wood products characterized by the following. 7. The preservative treated wood product according to claim 6, wherein one or more chemical substances selected from the group consisting of urea, melamine, acrylamide, polyvinyl urethane and derivatives thereof are used as the synthetic resin raw material.