JPS5925308A - Agent for controlling insect and termite for woody material, and method for treating woody material - Google Patents

Abstract

PURPOSE:To achieve excellent controlling effect to the wood-danaging insects and termite, by treating a woody material with the titiled agent containing O,O- diethyl-O-2,3-dihydro-3-oxo-2-phenyl-6-pyridazinyl phosphorothioate. CONSTITUTION:A woody material is treated with an agent for protecting woody material from insects and termite and containing the compound of formula as an active component, e.g. by either of the impregnation under pressure, impregnation in vacuum, mixing to adhesive, or surface treatment. The amount of the compound to be added to the woody material is >=3g/m<3> by coating, immersing, or spraying in the case of surface treatment, >=0.1g/m<3> in the case of impregnation under pressure or in vacuum, and >=10g/m<3> in the case of mixing to adhesive. When the agent controlling insects and termite is applied to wood, it keeps excellent controlling effect for a long period. Since it has low toxicity and is effective even at a low rate of application, it can be used safely with decreased danger of environmental pollution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel wood material 1! This invention relates to an insect and termite repellent and a method for treating wood materials using the same.

In recent years, Japan's demand for wood has increased significantly, leading to the depletion of domestic forest resources, and with the import of South Sea wood, North American wood, etc., damage from rat bark beetles has increased when South Sea wood, especially lauan, is used. However, the damage caused by using hardwoods other than nonchalch, such as hardwoods containing a large amount of starch, such as zelkova and konara oak, was also noticeable.

On the other hand, due to a lack of housing land, forested areas in the suburbs of cities are often cleared for housing development, and since houses are built on land where termites naturally thrive, termite damage increases, causing serious economic losses. It's happening. Also, since the oil crisis,
As people's living environment becomes more comfortable due to increasing awareness of energy conservation in houses, the extensive use of insulation materials, and changes in underfloor structures, the temperature, humidity, and environmental conditions have become conducive to the growth of wood pests such as wood beetles and termites. It is believed that this is a contributing factor to the increase in damage caused by these wood pests.

Wood materials such as logs, bamboo materials, milled products, plywood, and Particleboard 1-1 Tosei materials can be used as they are for structural members, civil engineering +A, telephone poles, sleepers, etc. due to their unique characteristics and characteristics. It is processed and used for various purposes such as building construction products, interior and exterior wall materials, building materials, furniture, etc. However, on the other hand, as it is an organic material, it is susceptible to biological deterioration, especially by insects, and In most cases, it is used for a long period of time. For example, in the case of a house, durability is required for 10 years or more, preferably 50 years, and it is difficult to apply insect and termite treatment to each housing member after construction, so the insect and termite repellents applied at the time of construction are 10 to 50 years. Long-term efficacy properties lasting up to 50 years are required. Conventionally, organic chlorine-based agents such as chlordane, T-B HC, DDT, and dill-niline have been used in large quantities as insect and termite repellents using wood materials. However, it has serious drawbacks in adhesion, paintability, hygroscopicity, corrosion resistance to iron, odor, rash, irritation, safety for humans and animals, cost, workability, etc. For example, r −B T
-I C is toxic to humans and animals, odor, rash, irritation,
Feeds on iron, and if no chemicals are used at high concentrations, it will last for a long time.
DDT and dieldrin have drawbacks such as having a negative effect on the insect repellent and termite-repelling effect, and in this case, adhesion and paintability. and its use and manufacture are prohibited. Currently, Riji J Ruden, which is a typical insect repellent and termite repellent for wood materials, is effective in repelling insects and termites when used at high concentrations, but it has drawbacks such as high toxicity to humans and livestock, and high toxicity to fish. have That is, in the mutagenicity and carcinogenicity tests, the acute toxicity LD50 value was 270 to 570 mg/k orally.
g (U・Nodo), 530 to 700 ■/kg (U・G) per skin.
) I-), the fish toxicity T L m value (48 hours) was 0.
It is highly toxic at 26 ppm and O,l ppm for Japanese medaka. In addition, chlordane is highly volatile, and in order to provide long-term efficacy when applied to wood materials, it is necessary to use a large amount of chemicals during treatment, which poses a risk to worker safety, user safety,
There are problems with the impact on the environment.

Therefore, the development of an insect repellent and termite repellent for wood materials that has excellent long-term insect repellent and termite repellent effects, is safe, and has little risk of causing pollution.
This is considered a serious and urgent task for those skilled in the art.

As a result of intensive research into insect and termite repellents for wood materials, the present inventors found that 0,0-diethyl-0-2,3-dihydro-3-oxo-2- represented by the following structural formula: When wood materials are treated with a chemical containing phenyl-6-pyritacinylbosphorothioe 1 (hereinafter abbreviated as phos l=lothione-1-), excellent insect control against wood pests) iJ fruit is obtained. I discovered that it can be demonstrated effectively. The insect repellent and termite repellent of the present invention is
Contains 1-thioate as an active ingredient, maintains excellent insect and termite control effects for a long time when applied to wood, has low toxicity, and is effective even in small amounts, so it is safe (if there is little risk of pollution). be.

Polythioate is known as a low-toxic organic phosphorus agent effective in agricultural insecticides. For example, 1ireu
U.S. Pat. No. 2,759,937 of I1 describes that it is self-effective as an insecticidal and acaricide;
1568 and No. 11 Publication No. 52-46288, it is described that it can be used to control the Japanese porcupine moth and the black-and-white moth. Generally, pesticides are required to have low persistence. Pesticides with a half-life of one year or more are designated as residual pesticides by the Agricultural Chemicals Control Law, and their usage is heavily regulated, and there are currently very few pesticides that fall under this category. Therefore, the half-life of jffI-concentrated pesticides is within one year (and the half-life of the present phosphodi-Jthiony 1 is 10 to 301 years).

For this reason, wood-based insect and termite control requires long-term efficacy lasting from 10 to 50 years (4), and persistence or l0 = 3.
It is inconceivable that this phosphorothioate, which has a 0-day shelf life, could be used as an insect and termite repellent for wood materials that requires long-term persistence. However, unexpectedly, the present inventors have found that when the present phosphorothi "-:+'--1" is applied to wood materials, the insect repellent and termite-repellent effect against wood grain pests is maintained for an extremely long period of time. I found out what to do. Comparing the insecticidal efficacy of conventional insecticidal agents, such as phosphorothioate and fenitrothion, which were applied to materials other than wood materials such as glass plates at a ratio of 1:1 and subjected to 1ii41 reversion, these pesticides, including phosphorothioate I-, Both are 1Ii
Efficacy decreased with increasing number of days of treatment. This can easily be considered due to the nature of agricultural chemicals. However, although the present phosphorothiony I. has a short half-theta translation period like other agricultural chemicals, it showed surprisingly long-lasting strength only when applied to wood material T1. The present inventors have not yet elucidated the unique effects of this phosphorothioene 1. As a result of its action, amazingly long-lasting efficacy is achieved. It is expected that this is due to the adsorption derived from the fine structure of Zunawara bosuborothioate and wood lumber-1, and the combined effect of hemicellulose, polysaccharide, and oligomers.

The insect repellent and termite repellent for wood materials of the present invention contains the present phosphorotide as a component and exhibits amazingly long-lasting efficacy through its interaction with wood materials. The insect pests include beetles such as the bark beetles, the yellow bark beetle +1, the yellow bark beetle, the white bark beetle, the white bark beetle, and the common wood pests such as ants.

Regarding the method of using the insect repellent and termite repellent for wood materials of the present invention, the present bosborothioate can be applied as it is as an insect repellent and termite repellent for the above-mentioned target pests. , mixed with a suitable carrier and various auxiliaries as necessary, to prepare a soluble agent, a urea-soluble agent,
Emulsions, powders, granules, wettable powders, solubilizers, aerosols,
It is used in formulations such as smokers, pastes, and microcapsules. Auxiliary agents for improving the properties of the preparation and enhancing its insect- and termite-proofing effects include surfactants, stabilizers, lubricants, solidifying agents, thickeners, penetration enhancers, and the like. Of course, the efficacy of properties can be improved by mixing R-1-I, 7-BIIC, heptanoyl, and other phosphorus-based insecticides or carbamate-based insecticides.

The composition ratio of the active ingredient of the present invention in the preparation depends on the form of the preparation,
Although it is not particularly limited and should be selected as appropriate depending on the purpose of use and processing method, in many cases, 0%
．． It is sufficient to contain 1 to 80% by market weight, and it can be diluted as appropriate when used or used as is.

Methods for treating woody insects and termites using the wood-based insect and termite agent of the present invention include application methods, immersion methods, etc. N method, pressurized and reduced pressure injection method,
Treatment techniques such as the adhesive mixing method and the diffusion method can be used, and are appropriately selected depending on the type of machine to be treated, the application, and the target insect. The amount of chemicals used varies depending on the type of wood material, treatment method, and target pest, but when applying surface treatment methods such as coating, dipping, and blowing, 5 ■ / % or more, preferably 10■/, (
That's all, the termites are more than 10cm/M in the evening.
Preferably it is 20 ng/% or more. There is no upper limit for b, Mi11, but it is not necessary to apply a large amount, and from the viewpoint of health and hygiene safety, it is generally recommended to be 4 g/rrl or less than 9J. In the case of pressurized injection, the amount of drug used is 0.1 g/m or more for beetles such as Hiratakiku f.
Preferably 4J: 0.2 g/m ~ 300 g
/rr? , in line with Shi071Jt11 l g /
rd or more, preferably 10g to 5kg 7 mouths 1', and in the adhesive mixing method,
0g/n? Above, preferably 25 g/m to 960 g
/m, and for termites it's more than I Og/rd.''
Yu, preferably 50 g/, n~5 kg/n? It's good to have. The amount of chlortene used in the past has been reduced,
4 g/m in the case of "& crushing, spraying" (compared to 960 g/m or more in the case of adhesive mixing method)
You can achieve your goals with much lower doses.

Historically, the toxicity of this phosphorothiony-1- is extremely low, such as acute toxicity (■), D501I! 1 is 769 +ng orally
/ kg (rat), dermal 2,300 ■/kg (rat), and no abnormalities were observed in subacute and chronic toxicity tests. In addition, in the fish toxicity test, T L m increased to +2 I) r) m for carp in 48 hours, and L for Japanese medaka.
Q pp m. Due to its apparent toxicity to mammals and the minimum dosage that will determine the insect- and termite-repelling effect when the agent of the present invention is actually applied to wood materials, it is considered that this is the active ingredient of the wood + 4-component anti-termiticide of the present invention. Comparing the relative safety coefficient of phosphorothioate 1 and chlortene - (self-effective drug dose against wood + A pests) / (Lr of rhano 1 - 50 value), this bosborothioate is effective as an insect repellent using wood. When used as a termiticide, it can be said to be approximately 60 to 100 times safer than chlortene.

The present inventors have discovered that when the insect repellent and termite repellent of the present invention is applied particularly to wooden paulownia wood, its effectiveness is maintained for a long time even in small amounts. The present invention was completed by solving problems such as the effect on the human body and the ecosystem, and by confirming that the chemical of the present invention can be treated without losing its woody +71 beneficial properties.

The insect and termite repellent for wood (wood A) of the present invention and the wood material treatment method using the same will be explained below using Examples and Experimental Examples.

)Ku! Dilute 1 g of this bosborothioate with acetone -C
It was set to 100 mρ.

F; b) (9 Fat 2-1 g of the present phosphorothiony 1. and IOg of surfactant were diluted with xylene to 100 mρ.

Iri-4 Shioiri Ippon Phosphodi-1-thioate 0.3 parts Ishiura Conycil 99.7 parts Total 100 parts) Q Choza-4 Bosborothioate 60 parts Surfactant 10 parts Tutanol 300 parts Total 100 parts Example 5 Powder Nodo I? , spojil thioate 50 parts 11 minerals 1 part powder 45 parts surfactant
Total of 5 parts 100 pa+ 1 part (phosphothiol thioate 0.1 part isopropanol 79.9 parts surfactant -
2(] - Total 100 parts Comparative Examples 1 to 16 White oil components, additives, and T8 agents are summarized in Table 1. W/V in the table is an abbreviation for market/capacity. For example, Comparative Examples 1 means that 0.2g of chlortene was diluted to 100m7+ with a solvent, and W/W is a layer/weight ratio.For example, in Comparative Example 3, 2 parts of chlortene was diluted with a solvent to a total of 100m7+.
It means part.

Table 1 Examples: J force ratio of each chemical glue on various materials'
Jill (Toyo Kachishi No. 5C), glass plate (50 each
cJ) Whole pipette Example 1, Comparative Examples 1, 5,
11. Apply 15 chemicals evenly on each 5 m 12 area.
/ii.

These test materials are air-dried and placed in a ventilation dryer at 40°C. At each elapsed time, these test materials were taken out, two acrylic rings (direct size: 5 cm) were fixed on the board, and 50 adult yellow beetles were placed into each ring, and the number of dead specimens after 24 hours was calculated. observed. The results are shown in Table 2.

Table 2 Mortality rate of flat-footed bark beetles by number of days elapsed (
%) (11) Apply the same drug as in the experiment using the Japanese beetle, 40°C - 401:1.
A krill ring (5 cm in diameter) was fixed in the middle (the cedar shrine where the work was done), and 20 small beetles collected from the damaged wood were placed in each ring. The mortality rate of the test specimens was observed at 24 hours. The results are shown in Table 3.

Table 3 Mortality rate of small woolly beetles (%)
When the drugs were applied on a glass plate and the i4-like operation was performed, there was no difference in the efficacy of each drug, and the amount of linoka decreased over time. When the chemicals of the present invention were applied to lauan plywood and Quercus wood, which are typical wood materials that are damaged by the Japanese bark beetle, and subjected to the same weathering process, the chemicals of the present invention exhibited significantly superior J force sustainability. Indicated.

In addition, in an experiment in which the test material was changed to Chibitake chinensis beetle, the same paste J fruit (4I was used),
The specific efficacy persistence of the present phosphorothiony) when applied to wood materials was demonstrated.

Example 100 times diluted solution of Example 1 and Example 2 according to Japan Wood Preservation Association Standard No. 8, Wood Insect Repellent Insect Repellent Efficacy Test Method IL+, 2004? Insect repellent efficacy tests were conducted on the i-diluted TLK, the 100-fold diluted solution of Comparative Example 2, the 200-fold diluted solution, and the like. Oak pieces with high starch content (5x3
．． 5 x 1 cm) with a whole pipette.
m1. I took it and applied it. An experiment was conducted to find out whether the samples were air-dried in a room between 1&I01EI, and the ijJ weathering operation specified in the standard was carried out or not (surface treatment test).

The cross agent 'JJ Riki Tosada complies with the performance standards of wood insect repellent No. 10 of the same association standard. The performance criteria are as follows.

1.Insect repellent for wood insect repellent used for cloth, spraying or dipping treatment.The average number of insects generated is 3t7M or less.

The results are shown in Table 4.

When comparing this phosborothioate with chlordane, a typical insect repellent, for example, 20OnIg/chlordane
n? Even when used, 13 Japanese wood beetles occurred during one season of weather-resistant cultivation, whereas this phosborothioate was used at 1/40th of that amount, 5 μ/l, to reduce the occurrence of wood beetles to 0. I kept it to .

The experiments of Comparative Examples 6 and 12.16 were conducted using conventional pesticides (fenitrothion, dimethyl-2,2,2-1-lyct'
It has been shown that 1.2-sec-butylphenyl-N-methylcarhanot) has no insect repellent effect when applied to woody moons.

Examples Example 6 (7) 500 times diluted solution, 1000 times, 2000 times
Quercus sapwood (50×50
x4 mm) under reduced pressure. Injection amount is 150-280
kg/%. After leaving this specimen at room temperature for two weeks,
After performing the specified weathering operation (ventilation drying for 130 days at 40'C) and controlling the humidity at R, I+, 75%, 25°C ± 2°C, each specimen was coated with a diameter of 2 to 251111 and a depth of 15. The dragon holes were numbered (6 holes for each specimen).

C: Put the larvae in the container, plug it, and
After culturing for 2111 days at 5° (12°C, R, 11,75%), the state of the larvae was observed under X-rays. The experiment was terminated at this point.

The performance criteria for determining efficacy are as follows.

The insect repellent efficacy of the wood insect repellent used for IL or expansion treatment shall be an average mortality rate of 95% or more. The results are not shown in Table 5C.

Table 5: Mortality rate (96) of larvae of Hirakikikui (pressure treatment test), 0.1 g/r when applying the drug of the invention under pressure 2-
It is effective if the drug M+ dose is n' Liao 1-. In the case of Comparative Example 6, the larval mortality rate was low even with approximately 20 times the amount of the drug (12 (approximately 2 g/rl?), and some of the insects became adults and other trees) rA. spread the damage.

Example 11 Exit the 9J force test for wood insect repellent under the Wood Preservation Association Standard No. 8 (2) Experiments were conducted on the agents of Example 4, Comparative Examples 4, 8, 9, and 13 according to the test method for adhesive-containing insect repellents. I did it. The plywood manufacturing conditions and adhesive compounding conditions ('l) are as follows.

Adhesive compounding conditions Urea resin 100 parts Wheat flour 19 parts Hardening agent 0.5 parts Water 9.7 parts Chemicals - Comparative example) (Boys) Plywood manufacturing conditions Coating amount 30g/shaku 1 Plywood thickness 1-4-1m++ Cold pressure] Okg/cnl, 15 minutes hot pressure 120°C
, lQkg / c + d, 60 seconds Tree species: White lauan sapwood (The core is injected with 1k of nutrients specified by the standard.) The above compounding conditions are the amount of chemical added 200 g / n? In the case of 100g/n, 50g/125g/n? −、
10g/rr? (In case of D, 0.4 and 0.
2.0°1.The amount of the drug was reduced to 0.04 parts, and water was increased to make the total 130 parts. JWPA standard 10
The performance X and a half specified in the item is shown below.

The insect repellent effect of the wood insect repellent mixed into the plywood adhesive shall be such that the average number of insects in the treated test specimen is 3 or less, and the average number of insects in the deteriorated test specimen is 5 or less.

The results are shown in Table 6.

Table 6 When this drug is mixed into adhesive, 10 g/n? The insect repellent effect was demonstrated at the same amount of the chemical. In the case of chlordane and fenitrothion, even a dose 20 times that of this drug cannot effectively prevent the emergence of pest insects.

It has been confirmed that when wood materials are treated with a drug containing the present phosphorothioate as an active ingredient, it is effective against wood pests such as the Japanese wood beetle over a long period of time.

Example Japanese Termite Countermeasures Association Standard No. 1, Termite Efficacy Test Method (
c) Comprehensive test was carried out using 10 cans of Examples 2 and 2, 50 times diluted liquid, Comparative Example 3, 60 times diluted liquid of Comparative Example 4, 120 times diluted skin, Comparative Examples 5, 6, 10, 11, 14. This was done for 15.

A similar experiment was also conducted using the insect-proof plywood prepared in Experimental Example 4.

Test results are not shown in Tables 7 and 8. J T CA S ’N
The performance standards for coating, spraying and dipping chemicals specified in No. 15 are shown below.

(A') -3-1 Weight reduction rate Compared to other drugs, this drug was sufficiently effective against termites even in small amounts.

Example A red pine side A 30 x 30 x 200 mm was finished with a planer and diluted 10 times as in Example 2.3.2, 50
10-fold dilution, Comparative Example 2010-fold dilution, Comparative Examples 3, 7, 10.
For drug No. 14, 100 g/f was applied, Example 6
50-fold dilution, 100-fold dilution, 200-fold dilution of the drug,
For Comparative Examples 6, 12, and 16, vacuum injection was performed.

The injection amount was 400-530 kg/I. Ten test specimens were used for each test, and the treated test specimens were air-dried indoors for one month, after which each test specimen was buried 30 cm in soil, and these stakes were observed one year and two years later.

The method used to evaluate the degree of damage is the one used by the Forestry Experiment Station of the Ministry of Agriculture, Forestry and Fisheries, and is shown below.

Comparative example drugs were inferior due to weathering operation ('BL, ,'5
All of them show a high mortality rate when chopped into 'lj'o ants, but are susceptible to feeding damage and are not suitable for practical use. On the contrary, the drug of the present invention had a high mortality rate and a very low weight loss rate when diluted 10 times as shown in Example 2, for example. Even with a 100-fold dilution, although the mortality rate was slightly lower, the weight loss rate was kept very low, that is, there was almost no feeding damage, and this is based on the 1F extra-dietary effect of the present bosborothioate.

The weight loss rate of treated test specimens shall be 3% or less regardless of the presence or absence of weathering. However, if the average weight reduction rate of the untreated specimen is less than 20%, the test must be repeated.

Table 7: Comprehensive termite test results Damage level Observation status 0.1 keizen.

1. Partially light cleanup.

2　Mild cleanup throughout.

3. In addition to the condition described in 2, some parts of the copy are badly cleaned.

4. Completely poor copywriting.

5　The shape is distorted due to fair copying.

The results are shown in Table 9.

Table 9 (11-) The average is the sum of the degree of damage divided by the average amount of damage caused by 10 trees.

The long-term efficacy of the drug of the present invention, which has bosbonthony(-) as its self-effective ingredient, is also significantly lower than that of other drugs such as chlordane shown in comparative examples. This experiment showed that while all other pesticides cause feeding damage within one year, when the chemical of the present invention is used on wood materials, it is effective against termites by pressurized injection.
/n? As mentioned above, a surface treatment method of 1 g/m or more is effective.

Comprehensive evaluation of the experimental examples L; l J: shows that the insect and termite repellent for wood materials of the present invention exhibits significantly longer lasting efficacy, especially when applied to wood materials.Experimental Example 1) It has been proven to have long-term effectiveness as an insect repellent and termite repellent for wood materials, and as an insect repellent and termite repellent for wood materials.

Especially when applied to wood materials, the insect repellent and termite repellent of the present invention can be expected to have the same or better effect with a small amount as compared to other agents, and exhibits excellent long-lasting efficacy. You can obtain sufficient insect and termite control for a long period of time with this chemical. The above points are not only economically advantageous, but also extremely advantageous in the sense of preventing various undesirable side effects caused by large-scale processing.

Claims (6)

[Claims] (1) O20-diethyl-2,3-cyhydro [
An insect and termite repellent for wood materials, characterized in that it contains l-3-oxo-2-phenyl-6-pyridazinylphospo[I thioate. (2) Treating the wood material with an agent containing 0,0-diethyl-0-2,3-dihydro-3-oxo-2-phenyl-6-pyridazinyl phosphorothioate represented by the following structural formula: A wood material processing method characterized by: (3) The method for treating wood materials according to claim 2, wherein the treatment is carried out by any one of a pressure injection method, a reduced pressure injection method, an adhesive mixing method, and a surface treatment method. (4) Surface treatment is carried out by coating, dipping or spraying, thereby applying 5'ng/I'I? to the wood material. The method for treating wood materials according to claim 2, which contains the above 1-st bosphorothioate. (5) 0.1g into wood materials by pressure or vacuum injection method
The method for treating wood materials according to claim 2, wherein the bosborothioate above /mI22 is contained. (6) A method for treating a wood material according to claim 2, in which the wood material contains 10 g/m or more of the bosporothioate by an adhesive mixing method.