JP5669303B2 - Insect control method for wooden building materials - Google Patents

Description

The present invention relates to a wooden building material used in houses and other buildings, and more particularly to a method for preventing damage to a wooden building material having excellent insecticidal properties to prevent insect damage caused by dry material pests.

In recent years, measures for reducing formaldehyde in wooden building materials used in houses and other buildings have been actively sought, and free formaldehyde has been reduced in plywood base materials and wooden floorboards using the same. Accordingly, it has become easier to inhabit pests such as the larvae.

Insect repellent treatment has been used in the past to use insect repellent plywood. Insect repellent plywood is manufactured by mixing an insect repellent into an adhesive that bonds a single veneer of wood. In the method of mixing in the adhesive, it is difficult for the medicine to reach the vicinity of the center in the thickness direction of the wood veneer constituting the plywood, and it is difficult to obtain a reliable insect-proof effect.

In addition, when a large amount of insect repellent is used, workability is reduced and the amount of medicine used is increased, which is economically disadvantageous. For the above reasons, it has become a major issue to improve the effect of preventing the surface penetration of the wooden building materials accurately within the limited amount of medicine used and the processing conditions.

JP 2000-153505 A JP 2000-280204 A

It is an object of the present invention to increase the maximum insect repellent effect by using a minimum amount of chemicals without degrading the quality and workability in producing a wooden building material such as a wooden floor board, a wooden wall board, a wooden fitting or a staircase board. It is.

In order to solve the above-mentioned problem, in a wooden building material manufactured by attaching a coating to the surface of a wood substrate, the above problem is solved by mixing an insect repellent into an adhesive that adheres the wooden substrate and the coating. is there.

According to the present invention, it is possible to provide a method for preventing insects of a wooden building material which is efficient and inexpensive and has a high penetration preventing effect.

The method for preventing damage to wooden building materials of the present invention will be described in detail below.

Examples of the insect repellent having a water solubility of 100 ppm or more at 25 ° C. used in the present invention include 1- (6-chloro-3-pyridylmethyl) -N-nitroimidazolidin-2-ylideneamine (generic name: imidacloprid), (E) -N-[(6-chloro-3-pyridinyl) methyl] N〕 -cyano-N-methylethaneimidamide (generic name, acetamiprid), 3- (2-chloro-1,3-thiazol-5-ylmethyl) -5-methyl-N-nitro-1,3,5-oxadiazinan-4-ylideneamine (thiamethoxam), (E) -1- (2-chloro-1,3-thiazol-5-ylmethyl) -3-methyl- 2-Nitroguanidine (generic name, clothianidin), 3- (6-chloro-3-pyridylmethyl) -1,3-thiazolidine-2-ylidocyanana Neo (generic name, thiacloprid), N-((6-chloro-3-pyridinyl) methyl) -N-ethyl-N′-methyl-2-nitro-1,1-ethynediamine (generic name, nitenpyram) Examples thereof include nicotinoid compounds, organic phosphorus compounds such as acephate, methidathione and dimethoate, carbamate compounds such as metorcarb and mesomil, and boric acid. In particular, (E) -1- (2-chloro-1,3-thiazol-5-ylmethyl) -3-methyl-2-nitroguanidine (generic name, clothianidin) and 1- (6-chloro-3-pyridylmethyl) ) -N-nitroimidazolidin-2-ylideneamine (generic name, imidazolcloprid) is particularly preferred.

Although the active ingredient may be used as it is for the insect repellent of the present invention, it is usually used after being formulated. Although the kind of formulation is not particularly limited, a liquid formulation is preferable from the viewpoint of ease of handling. Examples of liquid preparations include aqueous solvents, emulsions, oils, flowables and the like, but are not limited to these preparations. The above-mentioned preparation can be prepared in the same manner as an ordinary agricultural chemical preparation. Furthermore, preservatives, stabilizers, antioxidants, chelating agents, rust inhibitors, antifoaming agents, pH regulators, etc. effective for general bacteria to stabilize the formulation itself and stabilize the chemicals during processing May be added. Moreover, you may mix another insect repellent for expansion of an insect repellent spectrum.

Or you may mix the insecticidal composition whose water solubility in 25 degreeC is less than 100 ppm.
For example, organophosphorus compounds such as fenitrothion, fenthion, diazinon, chlorpyrifos, dichlorvos, propetanephos, carbamate compounds such as carbaryl, fenobucarb, propoxur, allethrin, praretrin, phthalthrin, phenothrin, ciphenothrin, permethrin, empentrin, imiprotolin, Cypermethrin, fenvalerate, tralomethrin, etofenprox, silafluophene and pyrethroid compounds such as optical isomers and geometric isomers thereof, phenylpyrazole compounds such as fipronil, oxadiazine compounds such as indoxacarb, pyriproxy Fen, Phenoxycarb, Diflubenzuron, Chlorfluazuron, Bistrifluron, Shiromagi Insect growth regulators such as, and other insecticides like.

The target wood substrate may be plywood, solid wood, LVL, MDF, particle board, or OSB board. More preferably, plywood or solid wood is good. A covering is attached to the surface of the wooden substrate, and an insect repellent layer is provided between the substrate and the covering.

The insect repellent layer includes a method of mixing in an adhesive for attaching a covering, applying a drug on the surface of the base or covering, or immersing the base or covering itself in a chemical solution. In particular, a method of mixing in an adhesive for adhering the base material and the coating is preferable.

Neonicotinoid compounds can be used as insect repellents, but are not limited thereto. The abundance of the insect repellent between the wooden substrate and the covering is preferably 0.0025 g or more per 1 m ² . Of course, the insect repellent may be other than these, and the treatment conditions may be appropriately selected from methods suitable for the agent. Examples of the chemical treatment method include treatment on a wooden substrate, treatment on a coating, and mixing in an adhesive, and a method of mixing with an adhesive is particularly preferable.

When treating the surface of the substrate or coating, the substrate or the coating itself may be immersed in a solution of the drug, or spray coating, brush coating, or roll coating may be used. . The application amount in the case of application and spraying may be about 10 to 400 g / m ^{2 by} wet. Of course, the insect repellent may be other than these, and the treatment conditions may be appropriately selected from methods suitable for the agent.

As an adhesive for attaching the covering, an ordinary woodworking adhesive can be used. For example, vinyl acetate resin adhesive, urea resin adhesive, melamine resin adhesive, urea melamine resin adhesive, modified silicone, and others can be used. The bonding conditions may follow the bonding conditions of the adhesive. Of course, the adhesive and the production conditions may be other than these.

As a wood base material described in detail above, a covering is attached thereon to obtain a wood building material. The covering at this time is, for example, wood such as oak, zelkova, cherry blossom, beech, etc., other wooden decorative veneers, plywood, LVL, etc., vinyl chloride film, olefin resin film, metal foil, synthetic resin molded product, Synthetic wood, paper, cloth, etc. can be used. In particular, wood such as beech, plywood other than insect-proof plywood, and an olefin resin coating are preferable.

[Example 1]
Clothianidin was diluted with N-methylpyrrolidone to a predetermined concentration on one side of a wood veneer (tree species beech, thickness 0.3 mm), and this diluted solution was applied to 100 g / m ² . Next, the above-mentioned veneer was adhered to the surface of the plywood (Lawan, 5 ply) with a woodworking bond (manufactured by Konishi Co., Ltd., vinyl acetate resin) so that the drug-treated surface was on the plywood side to obtain a test body.

[Example 2]
A test specimen was prepared by changing clothianidin of Example 1 to imidacloprid.

Example 3
Clothianidin was diluted with N-methylpyrrolidone to a predetermined concentration on one side of a plywood (Lawan, 5 ply) and applied to 100 g / m ² . A wood veneer (tree species is beech, thickness 0.3 mm) was attached to the chemical treatment surface of this plywood with a bond for woodworking (made by Konishi Co., Ltd., vinyl acetate resin) to prepare a test specimen.

Example 4
A test specimen was prepared by changing clothianidin of Example 3 to imidacloprid.

Example 5
On one side of plywood (Lawan, 5 ply), clothianidin is diluted with N-methylpyrrolidone to a predetermined concentration, added to a woodworking bond (manufactured by Konishi, vinyl acetate resin) to a specified concentration, and mixed well , 400 g / m ² , and a wood veneer (tree species is beech, thickness 0.3 mm) was attached to prepare a test specimen.

Example 6
A test specimen was prepared by changing clothianidin of Example 5 to imidacloprid.

[Comparative Example 1]
The clothianidin of Example 1 was changed to permethrin (water solubility at 25 ° C. is less than 100 ppm) to prepare a test specimen.

[Comparative Example 2]
The clothianidin of Example 1 was changed to silarofene (water solubility at 25 ° C. is less than 100 ppm) to prepare a test specimen.

[Comparative Example 3]
The clothianidin of Example 3 was changed to permethrin to prepare a test specimen.

[Comparative Example 4]
The clothianidin of Example 5 was changed to permethrin to prepare a test specimen.

[Comparative Example 5]
The test piece was prepared by adhering the drug-treated surface of the veneer of Example 1 to the side opposite to the plywood side.

[Comparative Example 6]
A specimen was prepared without attaching the wood veneer of Example 3.

[Insect repellent performance test method]
A hole is made in the side surface of the base material portion of Examples 1 to 6 and Comparative Examples 1 to 4 which are test bodies in which an insect repellent is present between the wood base material and the covering so as to have a predetermined concentration. Place the bark beetle larvae one by one, bury them with artificial feed powder, put the aluminum stopper in a plastic cup, and let it stand in a temperature-controlled room for 4 months. The presence or absence of was observed. The results are shown in Table 1.

The wood building material having the ability to prevent penetration by pests of the dry material according to the present invention should have an insect repellent between the wood base material and the covering material when covering the wood base material and the like that are easily damaged by the pests with the covering material. Thus, it is a method for preventing dry material pests from penetrating the coating, and it is possible to provide an insect control method for wooden building materials that is efficient and inexpensive and has a high penetration prevention effect.

Claims (5)

A structure in which the surface of a wood substrate is covered with a structure made of any of wood, plywood, composite flooring, LVL, MDF, particle board, OSB board, plastic and metal foil , and the wood substrate and the wood substrate are covered. A method for preventing penetration of wooden building materials by dry material pests, characterized by including an insect repellent having a water solubility of 100 ppm or more at a temperature of 25 ° C.   A method for preventing penetration of a wooden building material by a dry material pest, wherein the insect repellent according to claim 1 is a neonicotinoid compound.   The neonicotinoid compound according to claim 2, wherein (E) -1- (2-chloro-1,3-thiazol-5-ylmethyl) -3-methyl-2-nitroguanidine and 1- (6-chloro- A method for preventing penetration of a wooden building material by a dry material pest, which is at least one compound selected from 3-pyridylmethyl) -N-nitroimidazolidine-2-ylideneamine.   The dry material pest according to any one of claims 1 to 3, wherein the dry material pest is an insect belonging to the family Asteridae.   The wooden building material according to any one of claims 1 to 4, wherein the wooden building material is a wooden floor board, a wooden wall board, a wooden fitting, or a staircase board.