JP3159773B2 - Antibacterial wood - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial wood obtained by collecting or molding a wood material with a resin mixed with an antibacterial agent.

[0002]

2. Description of the Related Art In general, as improved wood, wood obtained by molding wood chips with a resin adhesive, or wood obtained by cutting wood cut into plates or squares with a resin adhesive is manufactured. The improved wood is widely used, for example, for shelves, furniture, decorative plywood, building materials and the like.

On the other hand, since the above-mentioned improved wood is made of wood and resin adhesive, it easily becomes a habitat of microorganisms due to water contained in the wood or moisture absorption during use, and is a place for breeding of various germs. Was. Therefore, in order to prevent this, conventionally, an organic antibacterial agent such as pentachlor phenol and orthochloro phenol has been added to the improved wood.

[0004]

However, many of the organic antibacterial agents for improved wood which have been used as described above have been discussed for their safety to the human body and the environment.

[0005] Microbial contamination of the improved wood proceeds as the microorganism grows by contact of the microorganism with water containing nutrients present inside the improved wood. As a result, decay and decay occur from inside the improved wood, and there is a problem that the improved wood becomes brittle, generates a bad smell, and discolors.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide antibacterial wood which can prevent microbial contamination of wood, is highly safe for the human body, and has low environmental pollution. It is.

[0007]

The present invention provides an inorganic antibacterial agent.
Is carried, and at least a part of the surface is coated.
It is antibacterial wood in which a wood material obtained by collecting or processing wood is formed using a resin mixed with a carrier for an antibacterial agent coated with a material.

[0008]

According to the present invention, there is provided an inorganic antibacterial material mixed with a resin used for shaping or processing wood material.
Prevent the growth of microorganisms.

[0009]

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

(Embodiment 1) FIG. 1 is a view showing a cut surface of an antibacterial particle board according to an embodiment of the present invention. That is, as seen on a cut surface of an antibacterial particle board which is an example of antibacterial wood, a small cut red pine chip 1 is adhered by a urea resin adhesive 3, and the urea resin adhesive 3 has, for example, thiosulfone An inorganic antibacterial material 2 using a silver complex salt or the like is mixed.

Next, a method for producing the antibacterial particle board of the above embodiment will be described.

First, 100 parts by weight of a water-soluble silver salt such as silver acetate, 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 are dissolved in water containing no chlorine. Let
The mixture was mixed with sufficient stirring to obtain an aqueous solution of a silver thiosulfato complex.

The carrier for the antibacterial agent used in this embodiment is "JI
SZ0701 Silica gel desiccant for packaging "
Type silica gel powder. The B-type silica gel powder has a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption at high humidity, and has an average particle size of about 3 μm.

The silica gel powder was dried at 180 ° C. for 2 hours or more. The above silver thiosulfato complex solution was mixed with 100 parts by weight of the above silica gel so that the silver component was 2 parts by weight. Next, the water absorbed in the solvent and the carrier was promptly removed. Next, this was pulverized to a predetermined particle size to obtain silica gel carrying an antibacterial agent.

Next, 100 parts by weight of the above silica gel is dispersed in a solution obtained by diluting and mixing 100 parts by weight of tetraethoxysilane as a reactive organic silicon compound with ethyl alcohol, and pure water is added thereto to add tetraethoxysilane. Was hydrolyzed to coat at least a part of the surface of the silica gel. Next, this was dried to obtain a silver silica gel-based antibacterial material.

Next, 8 parts of a urea resin adhesive containing 10% by weight of a silver silica gel-based antibacterial material is sprayed onto 100 parts of a red pine chip having a thickness of 0.1 mm and a water content of 15% by a spray method, and pressed. Temperature 100 ° C, pressure 40kg / c
A single-layer particle board was prepared under m ² for 10 minutes. FIG. 1 shows the antibacterial particle board prepared as described above.

The antibacterial particle board is 3 cm ×
It was cut into a size of 3 cm and subjected to an antibacterial test. Table 1 shows the results.

The antibacterial test was performed using E. coli (Escherichia col
i), Staphylococcus aureus (Staphylococcus aureus)
Yes, according to the halo method. Evaluation was performed 3 days later. The above
Example of antibacterial particle board, antibacterial agent added
No particle board and conventional organic antibacterial
Organic antibacterial agent using pentachlor phenol
The test was performed in comparison with fungal particle board.

Further, the antibacterial particle board of the above embodiment was subjected to a discoloration test in comparison with a particle board to which no antibacterial agent was added and an organic antibacterial particle board using a conventional organic antibacterial agent. Table 2 shows the results of the color change after molding, the color change test by exposure to ultraviolet light, and the color change test by immersion in a chlorine-based detergent.

In the discoloration test, the color change after molding was examined by examining the surface color state of the molded product. In the UV exposure test, the cross-sectional color change of the antibacterial particle board of the above example after exposure to a sunshine weatherometer for 2000 hours was examined. For the immersion test for chlorine-based detergent, the cross-sectional color change of the antibacterial particle board of the above example after immersion in a 5% aqueous solution of sodium hypochlorite for 100 hours was examined.

Table 1 shows that the antibacterial particle board of the above embodiment has practical antibacterial performance.

From Table 2, it can be seen that the antibacterial particle board of the above embodiment has practical discoloration resistance.

[0023]

[Table 1]

[0024]

[Table 2]

The quality of the antibacterial particle board of the above embodiment was determined in accordance with JIS A 5908 (1961), and a predetermined standard was obtained.

Example 2 In Example 2, a silver zeolite-based antibacterial material was prepared in the same manner using zeolite instead of silica gel as a carrier, and used as an antibacterial material.

FIG. 2 is a view showing a cut surface of an antibacterial laminated material according to another embodiment. An antibacterial glulam, which is an antibacterial wood, was prepared as follows. That is, a urea resin adhesive 6 containing 10 wt% of the above-mentioned silver zeolite-based antibacterial material 5 in a beech material 4 conditioned to a cross section of 2 cm × 5 cm and a length of 90 cm.
And apply it with a screw clamp with a clamping pressure of 15
A laminated wood was produced under the conditions of kg / cm ² , 30 ° C., and 8 hours.

This was cut into a size of 3 cm × 3 cm and subjected to an antibacterial test in the same manner as in Example 1. Further, a color change test after molding, a color change test by exposure to ultraviolet rays, and a color change test by immersion in a chlorine-based detergent were performed in the same manner as in Example 1. The test results are shown in Tables 1 and 2 in the case of Example 1.
This shows that the antibacterial laminated material of this example has practical antibacterial performance and discoloration resistance.

The quality of the antibacterial glulam of Example 2 is described in Japanese Agricultural Standards (JAS) Notification No. 601 of the Ministry of Agriculture and Forestry.
The standard was obtained in accordance with July 8, 1974.

As described above, the antibacterial wood of the present invention has an antibacterial agent, which is a silver thiosulfato complex salt, which is highly safe to the human body and the environment, is carried on silica gel or the like, and the effect is stably maintained for a long period of time. In this case, a wood processed product such as wood or wood chips is hardened using a resin adhesive in which an inorganic antibacterial material having a dispersed structure is kneaded.

Therefore, the antibacterial effect is exerted in the adhesive portion where the antibacterial material is exposed, and the antibacterial component moves in the water in the wood due to moisture absorption of the main material and is dispersed inside the wood. It is also used for whole wood. As a result, the growth of bacteria can be suppressed, and the wood becomes vulnerable due to decay and decay from inside, the generation of odor and the discoloration can be suppressed.

Further, the antibacterial material of the antibacterial wood of the present invention comprises:
Since a coating of a hydrolyzate such as tetraethoxysilane is provided, it is possible to control the elution amount of the antibacterial component, and the antibacterial wood is subjected to the temperature and pressure applied during molding and to the chlorine due to the use of various detergents. It is exposed to ultraviolet rays due to its use in a place exposed to system chemicals and sunlight, but has a stable antibacterial action and discoloration resistance action by controlling the elution amount of the antibacterial component.

In the above embodiment, a silver thiosulfato complex was used as the inorganic antibacterial agent. However, the present invention is not limited to this. Any inorganic antibacterial agent may be used, and other silver antibacterial agents may be used.
Alternatively, an antibacterial agent other than silver, such as copper or zinc, may be used.

In the above embodiment, silica gel or zeolite is used as the carrier for the antibacterial agent. However, the carrier is not limited to this, and other carriers may be used as long as the inorganic antibacterial agent can be stably supported.

In the above embodiment, a hydrolyzate of tetraethoxysilane was used as the coating material. However, the present invention is not limited to this. For example, a hydrolyzate of another tetraalkoxysilane such as tetramethoxysilane may be used. . Alternatively, other coating materials may be used.

In the above embodiment, the urea resin adhesive was used as the resin. However, the present invention is not limited to this, and other resins may be used as long as they can be used for collecting or processing wood materials. You may.

Further, in the above-described embodiment, the beech wood as the wood or the red pine chips as the processed wood material is exemplified. However, the wood or the processed wood material is not limited to these. is there.

[0038]

As is apparent from the above description, the present invention is characterized in that a wood material obtained by collecting or processing wood is formed by using a resin mixed with an inorganic antibacterial material. It is advantageous in that it can prevent microbial contamination, is highly safe for the human body, and has low pollution to the environment.

[Brief description of the drawings]

FIG. 1 is a view showing a cut surface of an antibacterial particle board according to one embodiment of the present invention.

FIG. 2 is a view showing a cut surface of an antibacterial glulam of another embodiment.

[Explanation of symbols]

 1 red pine chips 2 antibacterial material (silver silica gel) 3 urea resin adhesive 4 beech wood 5 antibacterial material (silver zeolite) 6 urea resin adhesive

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Atsushi Nishino 1006 Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-312802 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27N 3/00-3/04 B27K 3/16-3/52

Claims (1)

(57) [Claims] 1. An inorganic antibacterial agent is carried, and the surface of the
At least partly covered with coating material
An antibacterial wood, wherein a wood material obtained by collecting or processing wood is formed using a resin mixed with a carrier for an antibacterial agent .