JPH05309611A - Antimicrobial-treated wood and its production - Google Patents

Abstract

PURPOSE:To keep the properties of an antimicrobial-treated wood by a method wherein a wood having a large number of capillaries in its xylem tissue is dipped in water solution prepared by diluting water solution of silver thiosulfato complex salt by pure water so that the silver complex acid salt adheres to the surface of the wood and the inner surfaces of the capillaries. CONSTITUTION:A water-soluble silver salt, such as silver acetate, is added by the amount of 100 pts.wt. to chlorine-free pure water to be dissolved. To this solution, 450 pts.wt. of mixture of sodium sulfite and sodium hydrogensulfite and 300 pts.wt. of water-soluble salt of sodium thiosulfato are successively mixed by stirring to be taken into water solution of silver thiosulfato complex salt. A wood 1 is wholly dipped in this water solution. The silver thiosulfato complex salt adheres to the inner surfaces of a large number of capillaries 2 formed in the tissure of the wood 1 and the cut surface. In this manner, an antimicrobial-treated wood having a high stability can be obtained. The properties of the wood can be kept for a longer time since the soft surface of the wood 1 is always weared or polished to be renewed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to antibacterial treated wood obtained by impregnating or adhering an antibacterial agent to a material such as wood.

[0002]

2. Description of the Related Art Hitherto, timber and wood raw materials have been widely used as interior materials, and a large amount of antibacterial agents have been used for these interior materials in order to prevent microbial contamination due to dew condensation in the room. In general, the antibacterial agent is widely used for the purpose of using it as an antiseptic agent for suppressing the decay of wood itself rather than suppressing the growth of unpleasant microorganisms on the surface of wood.

Further, in recent years, the goodness of wood has been reviewed, and wood or a material made of wood has been widely used for furniture.

[0004]

However, the microbial contamination of the surface of the wood material starts when the water containing the nutrient source and the microbes come into contact with each other on the wood material, and dust and the like also adhere to the wood material, which eventually leads to It leads to slime development and fungal growth. As described above, the surface of the wood material is a habitat for microorganisms, and improvement of the cleanliness thereof is demanded. Therefore, although many antibacterial agents have been proposed, there is a problem in that the antibacterial agents are anxious about the safety of the human body and the environment.

The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide an antibacterial treated wood which can prevent microbial contamination and is highly safe for human body and environment.

[0006]

The present invention according to claim 1 is an antibacterial treated wood in which at least the surface of wood or a material made of wood is impregnated or adhered with an inorganic antibacterial agent.

According to the present invention of claim 5, an aqueous dispersion of an inorganic antibacterial agent is impregnated or adhered to at least the surface of wood or a material made of wood, and the wood or material made of wood is dried. A method for producing antibacterial treated wood.

[0008]

According to the present invention, the inorganic antibacterial agent attached to the surface of the wood prevents the growth of microorganisms, and the inorganic antibacterial agent impregnated in the wood appears on the surface due to the abrasion of the wood to maintain the antibacterial effect.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

(Example 1) FIG. 1 is a sectional view for explaining the structure of an antibacterial treated wood according to one embodiment of the present invention.
That is, in the wood 1 which is the material of the antibacterial treated wood, a large number of capillaries 2 such as phloem tubes and conduits formed in the xylem tissue exist, and inside the capillaries 2 and on the cut surface of the wood, A thiosulfato silver complex salt 3 effective as an inorganic antibacterial agent is attached.

Next, a method for producing the thiosulfato silver complex salt 3 and the antibacterial treated wood will be described.

First, 100 parts by weight of a water-soluble silver salt such as silver acetate is added to and dissolved in water containing no chlorine, 450 parts by weight of a mixture of sodium sulfite and sodium bisulfite, and 300 parts by weight of a water-soluble salt of sodium thiosulfate. The parts were sequentially mixed with sufficient stirring and dissolved to obtain a thiosulfato silver complex salt aqueous solution. The weight of sodium thiosulfate is shown as the weight of its hydrate Na ₂ S ₂ O ₃ .5H ₂ O.

Next, the aqueous solution of thiosulfato silver complex salt obtained as described above is diluted with 100 times of pure water, and the wood is immersed in the solution so that the whole wood is submerged. At this time, depending on the size of the wood or the like, it is also possible to carry out in a pressure device and pressurize or depressurize.

Table 1 shows the results of evaluating the antibacterial performance of the surface of the antibacterial treated wood of the above-mentioned examples manufactured with such a constitution.

[0015]

[Table 1]

Table 1 shows the number of bacteria on the wood surface under various conditions in the above-mentioned examples and untreated conventional products.

From these results, the antibacterial treated wood of the above-mentioned embodiment exhibits antibacterial properties on the surface and maintains cleanliness.

Example 2 First, an aqueous thiosulfato silver complex salt solution is prepared in the same manner as in Example 1.

The carrier used for the silver silica gel antibacterial agent particles of Example 2 is B-type silica gel powder described in "JIS Z 0701 Silica gel desiccant for packaging". This B-type silica gel powder is a silica gel powder having a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption amount at high humidity, and its average particle size is about 8 μm.

Next, the silica gel powder was heated at 180 ° C. for 2 hours.
Let it dry for more than an hour. The thiosulfato silver complex salt aqueous solution was mixed with 100 parts by weight of the silica gel so that the silver component was 2 parts by weight. Then, the water absorbed in the solvent and the carrier was promptly removed. Then, this was pulverized to a predetermined particle size to obtain silica gel carrying an antibacterial material.

Next, 100 parts by weight of the silica gel was dispersed in a solution prepared by diluting 100 parts by weight of tetraethoxysilane with 100 parts by weight of ethyl alcohol as a coating material, and then 20 parts by weight of pure water was added thereto. The tetraethoxysilane was hydrolyzed and coated on at least part of the surface of the silica gel. Then, this was dried to obtain silver silica gel antibacterial agent particles.

Next, the wood is soaked in a liquid in which 100 parts by weight of pure water is dispersed with respect to 1 part by weight of the above-mentioned silver-silica gel type antibacterial agent particles so that the whole wood is submerged. At this time, depending on the size of the wood or the like, it is also possible to carry out in a pressure device and pressurize or depressurize.

As a result of evaluating the antibacterial performance of the surface of the antibacterial treated wood of Example 2 manufactured in such a structure by the same method as in Example 1, the antibacterial treated wood of Example 2 is the same as that of Example 1. In addition, antibacterial properties were exhibited on the surface and cleanliness was maintained.

As described above, it is needless to say that the antibacterial treated wood of the present invention exerts an antibacterial effect by coming into contact with microorganisms on the surface of the wood, and the thiosulfato silver complex salt used has a vaporization in normal use. Very few. Therefore, the antibacterial performance of the surface is less deteriorated from the initial performance, that is, the antibacterial performance is maintained.
Further, since an inorganic antibacterial agent such as silver thiosulfato complex salt is highly safe for the human body and the environment, highly safe antibacterial treated wood can be realized.

On the other hand, the surface of wood is soft and the surface of the wood is always worn and abraded during use. After the antibacterial treated surface is abraded and polished, the inside of the antibacterial treated material appears on the surface, so that the surface is constantly renewed, and a new antibacterial treated wood structure emerges to maintain the antibacterial performance. effective.

Although the thiosulfato silver complex salt was used as the antibacterial agent in the above-mentioned Examples 1 and 2, the present invention is not limited to this, and other silver-based antibacterial agents may be used. Alternatively, if it is an inorganic antibacterial agent, another antibacterial agent such as a copper-based or zinc-based antibacterial agent may be used.

Further, in the above-mentioned Embodiments 1 and 2, the antibacterial agent is impregnated inside the wood, but the present invention is not limited to this, and the surface of the wood may be impregnated. Alternatively, it may be simply attached to the surface of wood.

Further, in Example 2 above, tetraethoxysilane was used for forming the coating of the hydrolyzate of the silver silica gel type antibacterial agent particles, but the present invention is not limited to this, and other tetraalkoxysilane such as tetramethoxysilane may be used. It may be.

Although silica gel is used as the carrier in the second embodiment, the carrier is not limited to this, and another carrier such as zeolite may be used as long as it has a carrying ability.

[0030]

As is clear from the above description, the present invention is capable of preventing microbial contamination because at least the surface of wood or a material made from wood is impregnated or adhered with an inorganic antibacterial agent. In addition, it has the advantage of being highly safe for the human body and the environment.

Further, the evaporation of the antibacterial agent is extremely small, and since the antibacterial agent always appears on the surface due to abrasion of the surface, there is an advantage that the antibacterial performance is less deteriorated and lasts longer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating the structure of antibacterial treated wood according to one embodiment of the present invention.

[Explanation of symbols]

 1 Wood 2 Capillary 3 Thiosulfato silver complex salt

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Atsushi Nishino 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. An antibacterial treated wood characterized in that an inorganic antibacterial agent is impregnated or adhered to at least the surface of wood or a material made of wood. 2. The antibacterial treated wood according to claim 1, wherein the inorganic antibacterial agent is a silver antibacterial agent. 3. The antibacterial treated wood according to claim 2, wherein the silver-based antibacterial agent is a thiosulfato silver complex salt. 4. The silver-based antibacterial agent according to claim 2, wherein at least a part of the surface of the silica gel supporting the silver thiosulfato complex salt is coated with a hydrolyzate of tetraalkoxysilane. Antibacterial treated wood. 5. An antibacterial method comprising impregnating or adhering an aqueous dispersion of an inorganic antibacterial agent on at least the surface of wood or a material made of wood, and drying the wood or the material made of wood. Method for producing sex treated wood. 6. The method for producing antibacterial treated wood according to claim 5, wherein the inorganic antibacterial agent is a silver antibacterial agent. 7. An antibacterial treated wood characterized by comprising impregnating or adhering a solution of a silver thiosulfato complex salt on at least the surface of wood or a wood-based material, and drying the wood or the wood-based material. Manufacturing method.