JPH0757149B2 - Wood protection sheet and wood protection method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a wood protecting sheet used for preservatives or insect repellents (including ant repellents) of wooden structures and the like.

(Prior Art) Conventionally, as this type of sheet, a chemical holding sheet for controlling termites, for example, sheets described in JP-A-58-142927 and JP-A-59-18822 are known. There is. These chemical-holding sheets are generally formed into a sheet by encapsulating a resin such as vinyl chloride, which is impermeable to water and has extremely low air permeability, with an anti-termite agent, and is laid on the soil surface without any gaps. By doing so, the termites can be prevented from invading the foundation or the like from the soil.

(Problems to be Solved by the Invention) However, in such a conventional drug holding sheet, since the drug is held in a tightly closed state by the water-impermeable resin material as a barrier, the drug held is It does not leach easily even if it comes into contact with rainwater, etc., and even if it deviates from the sheet, there is only a slight volatilization based on the original properties of the drug.

Therefore, it is necessary to lay the conventional chemical holding sheet on the soil surface completely without any gaps, and if there is a slight gap between the seams between the sheets and the seams between the sheets and the concrete cloth foundation, slabs, etc. White termites intrude from there, and even if a slight breakage occurs on the sheet surface, they intrude from here and cause great damage to the wood structure. Therefore, conventionally, there has been a problem that careful attention and a great deal of labor are required during the construction of the sheet so as not to cause such a gap or damage.

On the other hand, soil treatment conventionally performed as ant preventive work is a method of diluting an ant-control agent used as an emulsified formulation with water and spraying it on the soil. Not only the worker by invading the respiratory system,
There was a fear that it would hinder the health of the residents near the construction site.

The present invention has been made by paying attention to the above-mentioned problems of the conventional drug holding sheet and the problems of soil treatment by spraying the drug, and the wood is placed in a high humidity decay environment or an environment where termites are easily generated. When a preservative or insect repellent is leached, the preservative and insect repellent effect is quickly and safely exhibited, and the same effect as soil treatment with a chemical at the beginning of construction is obtained, and a wood protective sheet and a wood protective sheet are used. The aim is to provide a way to protect.

(Means for Solving the Problems) That is, the present invention is based on the fact that a water-soluble or water-disintegrating preservative and / or insect repellent (hereinafter simply referred to as a drug) is leached (in an emulsified or dispersed state) by contact with water. A sheet for protecting wood, which is held so that it can be washed out (including drainage), and a sheet having the agent thus held is spread around the wood so that it can be contacted with at least moisture in the environment. Wood protection method.

As the agent in the present invention, known wood preservatives, bactericides, insect repellents and the like can be used, but those which are soluble in water are preferable. If it is difficult to dissolve in water, it must be emulsifiable or dispersible in water. In this case, it can be used as a composition containing an appropriate emulsifier or dispersant. Alternatively, they may be encapsulated in microcapsules or the like and dispersed, and the leaching or dissolution rate can be controlled by such means.

Such a pharmaceutical composition may contain, for example, talc, if necessary.
It may contain a powdery or flake-like filler such as kaolin, or a reinforcing material such as a fibrous, ribbon-like or film-like material, and these fillers and reinforcing materials are integrally combined with a drug to form a sheet form. A water-soluble binder for the treatment may be included.

As such a binder, for example, a water-soluble resin such as polyvinyl alcohol or a water-soluble cellulose derivative or a water-soluble polymer substance such as gelatin or starch can be used. A binder is dissolved and compounded, and a liquid or pasty aqueous composition is obtained with or without addition of the above-mentioned filler and reinforcing material as necessary.

The aqueous composition thus obtained is applied onto a flat base material, dried and formed into a sheet, and in order to reinforce the obtained sheet, a water-permeable sheet body such as paper or woven cloth is provided on the base material. Alternatively, a non-woven fabric, a knitted fabric, a net, a sponge sheet, or the like may be placed and the aqueous composition of the drug may be applied and impregnated thereon. The sheet-shaped drug composition thus formed can be used by peeling it from the base material, but can also be used as an integrated sheet while being laminated on the base material, in which case the base material is reinforced. It also functions as a material.

Further, when a water-permeable sheet as described above is impregnated with an aqueous composition of a drug to form a sheet, a means such as spraying or dipping may be used instead of the application means as described above, or a plastic Roll the composition,
It can be formed into a sheet by pressing or other means, and the forming means is not limited.

When the wood protective sheet of the present invention is used as a laminated sheet without being peeled from the base material, if a non-water-permeable or non-moisture-permeable base material is used, the base material also functions as a moisture-proof protective layer. Further, the base material can be made to function as a part of the package together with the moisture-proof film or the like attached to the upper surface of such a laminated sheet. In such a case, the base material may be a smooth film or sheet, but if irregularities or wrinkles are appropriately added, the holding power of the drug composition is increased, and the drug solution generated during leaching of the drug Is less likely to flow down the surface of the sheet, and there is an advantage that droplets are easily separated from the sheet surface.

On the other hand, a large number of drug-containing recesses are provided on the surface of the water-impermeable base material, and after the drug composition is sealed therein, small holes communicating with the outside are bored so that water can freely flow into and out of the sealed recesses. Good. This means is effective for holding the drug suitably when it is a powder or granule.

The moisture-proof film used as described above has a thickness of 10 to
A 200 μ polyethylene film, a vinyl chloride film or the like can be used. Further, the moisture-proof film may be attached to the porous sheet by any of spot, line or surface adhesion using an adhesive or heat fusion.

The wood protective sheet of the present invention may have various composite structures as described above, and further, in order to enable sequential leaching of agents having different effects, a double-layered or triple-layered multi-layered structure is provided. Can also be configured to be

(Action) The chemical-retaining sheet of the present invention can exhibit remarkable antiseptic and insecticidal effects by being fixed on the surface of or around the object of antiseptic and insect control by appropriate means. That is, for example, when the sheet of the present invention holding a wood preservative is fixed to the wood surface placed in a decaying environment of high humidity, the preservative held in the sheet is leached by dew condensation water on the wood surface. To prevent the wood from decaying. Further, when the sheet of the present invention holding the insect repellent is laid on the soil surface under the floor such as a building, moisture evaporated from the soil is condensed on the lower surface of the sheet,
The insect repellent control agent retained on the sheet is transferred to the soil due to the dew condensation water and exerts an insect repellent control effect, thereby achieving the purpose of protecting wood.

Further, when using a wood protective sheet to which a moisture-proof film is adhered, it is preferable to install it so that the drug composition side is in contact with the object. In this case, the moisture-proof film is
It is effective in preventing contact with the human body during or after construction and increasing safety. Further, after the wood protection sheet of the present invention is installed, when the dry environment in which decay, insect damage, etc. do not occur immediately is continued, the agent retained in the sheet of the present invention suppresses the expression of its effect, It has the effect of immediately exhibiting the desired effects when the wood is put to a high humidity decay or insect damage environment.

(Example) As an example of the wood protection sheet of the present invention, the following 13 types of sheets were prototyped.

Polyester non-woven fabric (Toyobo Spunbond: 4051N) is a water-soluble wood preservative (Sanyo Wood Preservation Co., Ltd .: Pentacure
BM) A sheet having a drug holding amount of 30 g / m ² obtained by immersing in a 3 wt% aqueous solution and then air-drying.

A sheet having a drug holding amount of 10 g / m ² obtained by spraying a 5% by weight aqueous solution of a water-soluble bactericide (Valdac 2280 manufactured by Lonza Co., Ltd.) on one side of Kent paper using an atomizer and then air-drying.

Water-soluble paper (Mishima Paper Co., Ltd.): Dissolvo WA120MDP180W
A) One side has an anti-termite agent for soil treatment (Sanyo Wood Preservation Co., Ltd.):
A sheet having a drug retention of 25 g / m ² obtained by spraying an undiluted solution of Perzine emulsion using a sprayer and then air-drying.

A sheet obtained by heat-sealing a 50 μ-thick polyethylene film linearly at both edges on one side of the sheet obtained in step 1.

A sheet obtained by heat-sealing a 30μ hot polyethylene film on one side of Kent paper and then treating it in the same manner as on Kent paper.

After heat-bonding 100μ thick polyethylene film to spots at 9 points / m ^{2 on} one side of water-soluble paper similar to
A sheet obtained by processing in the same manner as.

A polyester non-woven fabric (TOYOBO Spunbond: 4050P) was coated with a mixed solution consisting of 20 parts by weight of carboxymethyl cellulose, 3 parts by weight of a water-soluble bactericide (Maldza Baldac 2280) and 77 parts by weight of water, and air-dried. Drug holding amount 10
Sheet with g / m ² .

Polyester non-woven fabric (TOYOBO Spunbond: 4050P) is overlaid on a polyethylene sheet with a thickness of 30 μm, and a drug mixture is applied and air-dried in the same manner as above. It has a moisture-proof film on one side and has a drug holding capacity of 10 g / m ² . Sheet.

A glass fiber woven mesh having an opening of 5 mm × 5 mm, 20 parts by weight of polyvinyl alcohol, 35 parts by weight of pyridafenthion, 45 parts by weight of water was applied and air-dried to obtain a drug holding amount of 25 g / m ² . Sheet.

A 100 μm-thick polyethylene sheet overlaid with a glass fiber woven mesh of 5 mm × 5 mm, coated with the drug mixture in the same manner as above, and air-dried to obtain a moisture-proof film on one side and a drug retention amount of 25 g. sheet with / m ² .

A 100 μm thick polyethylene sheet was coated with a mixed solution of 35 parts by weight of polyvinyl alcohol, 4 parts by weight of allethrin and 61 parts by weight of water on one side, and air-dried to obtain a moisture-proof sheet on one side with a drug holding amount of 0.4 g / m 2. Sheet with ² .

Hard vinyl chloride sheet with a thickness of 100 μm (diameter 5 mm, depth
2 mm recesses were embossed at a ratio of 1 per 1 cm ² ), and 25 parts by weight of polyvinyl alcohol, an anti-termite agent for soil treatment (Sanyo Wood Preservation Co., Ltd .: Perzine emulsion) 35 parts by weight, water 45 A sheet having a drug holding amount of 25 g / m ² obtained by applying a mixture solution of parts by weight and air-drying.

A 1-mm-thick polyethylene sheet (having a width of 0.2 mm and a depth of 0.9 mm at 1 cm intervals in the vertical and horizontal directions) was coated with the drug mixture in the same manner as above, and the amount of drug retained was obtained by air-drying.
Sheet with 25 g / m ² .

As a comparative example, the following two types of drug holding sheets were prepared.

(A) Polyester non-woven fabric (TOYOBO Spunbond: 4051
25 g /
sheet with m ² . (Example where the wood preservative is insoluble in water and does not leach out even if it comes into contact with water) (b) The asphalt mixed with a water-soluble bactericide (Lonza Baldac 2280) is melted and penetrated into the fiber base material. An asphalt waterproof sheet having a chemical retention of 10 g / m ² obtained by air drying. (Example where the wood preservative itself is water-soluble but is fixed with a water-insoluble binder and does not leach out even when it comes into contact with water) (Test example) Experimental wooden house of approximately 2 m square and approximately 2 m high in Hiroshima prefecture 3 Ridge (A
~ Building C) was built.

In each building, Betsuga material was used as the structural material, the outer wall (no inner wall was provided), the floor, and the field were composed of plywood of the first class, and the roof was covered with a waterproof sheet. The joints of the plywood were all waterproofed and the outer wall was coated with polyurethane resin.
A humidifier and a convection-type oil stove were installed in the room, and the temperature and humidity inside the room were controlled so that dew condensation always occurred on the inner surface of the wall. Also, under the floor of each building, a diameter of 35 to 45 should be
A cm termite nest was buried.

Test Example 1) Half of each of the sheets of Examples and 1 were fixed to the outer wall, the floor, and the inner surface of the open field of Building A by Gandaka half and half a year, and kept indoors in an environment where dew condensation always occurs. As a result, the part without the sheet adhered was considerably deteriorated, but the wood in the part adhered with the sheet was not deteriorated at all in any of the examples.

Test Example 2) The same test as in Test Example 1) was performed on the seats of Examples and 1 in Building B. The results were exactly the same as in Test Example 1).

Test Example 3) As a result of performing the same test as in Test Example 1) on the sheets of Comparative Examples (a) and (b) in the C building, the wood of the both sheet-attached portions is almost the same as the wood of the sheet-unattached portion. It was also decaying.

Test Example 4) The sheet of the example is spread over the entire surface of the underfloor soil at the time of building A, and the entire surface of the underfloor soil at the time of building B,
Oil-based wood preservative and anti-termite agent on Kent paper (Sanyo Wood Preservative Co., Ltd.):
A sheet having a drug holding amount of 25 g / m ² obtained by dipping and air-drying in a Perzine oil was spread, and the feeding damage by termites was observed.

As a result, in the building A, the construction conditions of the sheets of the embodiment were such that the foundations and other essential structural materials were used even though the joints between the sheets and some gaps between the sheets and the rising portions of the concrete cloth foundation were provided. Was not damaged at all. This is because the evaporated water from the soil is condensed on the bottom surface of the sheet,
It is considered that the moisture caused the ant-preventive agent held on the sheet to leach out and freely migrate into the soil.

On the other hand, in the B building, the ants did not damage the sheets themselves, but the ants crawled up through the gaps between the sheets and the gap between the sheets and the concrete cloth foundation, and damaged the foundation and the large pull, joists and pillars. Caused great damage.

Test Example 5) As a result of performing the same test as in Test Example 1) on the sheets of Examples and, as a result, no decay occurred in the sheet affixed portion.

Test Example 6) As a result of performing the same test as in Test Example 4) on the sheet of the example, no damage by termites to the base or other wooden structural materials was observed.

(Effect of the invention) Since the wood protective sheet of the present invention is formed by contacting with water and retaining it so that it can be leached, it is attached to wood placed in a decay environment or laid on the surface of insect-damaged soil. In this case, the retaining agent is leached by water such as dew condensation water on the surface of the sheet, and there is a remarkable advantage that the decay of wood and the occurrence of insect damage can be effectively prevented. Further, the construction of the wood protection sheet of the present invention requires almost no labor as compared with the conventional method of spraying or applying a preservative on the wood surface or laying the conventional termite controlling agent-carrying sheet carefully. It has the advantages of being extremely simple, having a good working environment during construction, and being safe in terms of hygiene.

Claims (7)

[Claims] 1. A wood protecting sheet, characterized in that a water-soluble or water-disintegrating preservative and / or insect repellent is held so that it can be leached out by the contacting water. 2. The wood protecting sheet according to claim 1, wherein the preservative and / or insect repellent is a water-soluble or water-disintegratable composition. 3. The wood protecting sheet according to claim 2, wherein the composition is formed into a sheet shape. 4. The wood protecting sheet according to claim 2 or 3, wherein the composition is a composite composition containing a filler or a reinforcing material. 5. The wood protecting sheet according to claim 4, wherein the filler or the reinforcing material is in the form of fiber or film. 6. The wood protective sheet according to claim 4 or 5, wherein the composite composition is formed into a laminated sheet. 7. A wood-protecting sheet comprising a water-soluble or water-disintegrating preservative and / or insect repellent which is held so as to be leasable by contacting water, at least around the wood to be protected in the environment. A method for protecting wood, which is characterized in that the wood is installed so that it can come into contact with moisture.