JPS5835482B2 - Insecticide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a biocide that targets pests such as bark beetles and termites that damage wood and electric wires.

In recent years, damage caused by wood beetles has become a problem due to the heavy use of South Sea wood, especially lauan wood.

In addition to termites and wood beetles, there are other pests that damage wood, such as sink beetles, wood beetles, and longhorn beetles.

Furthermore, termites are known to damage the vinyl chloride resin that covers electric wires.

To prevent damage from these pests, the materials are treated with chemicals appropriate for the material, and biocides are added to the vinyl chloride resin.

Organochlorine insecticides such as chlordane and dieldrin have been used as insecticidal ingredients for this purpose.

All of these insecticidal ingredients have problems in terms of persistence, toxicity, irritation, environmental pollution, etc., and the development of low-toxicity insecticides is desired.

The present inventor has spent many years researching pyrethroid drugs that are characterized by low toxicity and can be used for this type of purpose.

As a result, 3-phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane-1carboxylade (hereinafter referred to as permethrin) was found to be a compound with superior insecticidal properties and residual efficacy compared to chlordane and dieldrin. I found out.

Permethrin has the advantages of a pyrethroid drug, such as rapid action against insects and low toxicity against warm-blooded animals, and at the same time has excellent residual efficacy.

However, its use is limited because it is an expensive insecticide.

The present inventors have discovered that by blending a small amount of permethrin with chlordane, an extremely excellent insecticidal effect that cannot be seen with any of the chlordane alone can be exhibited.

According to the present invention, the amount of organic chlorine used is not increased, so there is no fear of environmental pollution, and the effect can be significantly increased, thereby reducing damage caused by pests to wood and electric wires, which is currently a serious problem. succeeded in.

Such a synergistic effect by mixing is not observed in the mixture of Tiltrin and Permethrin, but is a unique phenomenon observed only in the combination of Chlordane and Permethrin.

Various formulations of the insecticide of the present invention can be applied depending on the purpose of use, such as oil, powder, emulsion, wettable powder, aerosol, etc., and excellent synergistic effects were obtained with any of the formulations.

For example, in order to exterminate construction pests that attack wood, plywood, etc., the boards are treated with oil, emulsion, aerosol, etc. of the insecticide of the present invention, and when the insecticide is mixed into the adhesive for plywood, synthetic resin adhesive is used. Suitable methods include adding the insecticide directly to wheat flour, or preparing a powder by adding the insecticide to wheat flour in advance and mixing this powder with an adhesive.

In addition, when blending this insecticide with vinyl chloride resin for electric wires, trioctyl phosphate, tricresyl phosphate, polyester plasticizer, butylbenzyl phthalate,
By dissolving it in plasticizers such as diisodecyl phthalate and dioctyl phthalate and mixing it into synthetic resin for covering electric wires, it can prevent damage caused by termites, black ants, etc.

The synergistic effect of this mixture will be explained below using actual test examples.

Test Example 1 A predetermined amount of oil containing chlordane, dieldrin, and permethrin was applied to a plywood board, and after air-drying indoors for 24 hours, larvae of the Japanese yellow beetle were brought into contact with it for 2 hours, and the mortality rate was determined after 1, 3, and 5 days. Ta.

As a single ingredient, permethrin is the best, but when mixed with chlordane, it becomes even more effective, and a mixed oil containing 1.5% chlordane and 0.1% permethrin was effective enough to control the flattened bark beetle.

Test Example 2 A phenolic adhesive, which is a type of adhesive used in the manufacture of plywood, containing chlordane and permethrin was prepared, and three plywood boards (total thickness of 2.7 mm) were stacked. After making and sufficiently drying, the larvae of the oyster beetle were released and reared for 10 hours at 25° C. and humidity of 70%, after which the feeding damage rate and mortality rate by the larvae of the oyster beetle were determined.

The feeding damage rate is 30 plywood boards (5X2crrL) in one test.
The number of plywood boards that were damaged by feeding was observed and expressed as a percentage.

Compared to chlordane and permethrin alone, the combination of them showed a much higher insect repellent effect.

Test Example 3 Electric wires were coated with vinyl chloride resin containing chlordane, dieldrin, and permethrin, and termites were released.The mortality rate was determined over a period of 10 days.
When 0% mortality occurred, termites were released again and the test was repeated.

Chlordane alone is highly effective in the first release of termites, resulting in 100% mortality after 3 days, but is less effective in the second release, with a mortality rate of 25% after 5 days of release.

Dieldrin is also widely used to prevent termite damage to electric wires, but it is not very effective and it takes about 7 days for the first termites to die 100%.

On the other hand, the mixture of chlordane and permethrin of the present invention is much more effective than any of chlordane, dieldrin, and permethrin alone; 1.0% chlordane and 0.2% permethrin are sufficient, and the amount of chlordane used can be reduced. It is clear that even if the amount is reduced to 1/2, the effect is high.

In addition, the insecticide of the present invention can be used in combination with preservatives such as tributyltin, pentachlorophenol, and xyligen aluminum for the purpose of preventing wood from rotting due to microorganisms, thereby creating a more effective multipurpose insecticide. I can do it.

Next, examples of the present invention will be shown.

Example 1 White kerosene was added to 2 parts of chlordane and 0.2 parts of permethrin to obtain an oil solution, making the total 100 parts.

The wood to be treated with insect repellents is soaked, and this oil is sprayed or applied onto the surface.

Example 2 An oil agent is obtained by dissolving 1.5 parts of chlordane, 0.1 part of permethrin, and 1 part of tributyltin in white kerosene to make the total 100 parts.

Example 3 7720 parts of Chlor, 1 part of Permethrin and 5M of Tsurpol
-200 (Toho Chemical registered trademark name) 20 parts, Kijirol 5
9 parts were added, and these were thoroughly stirred and mixed to dissolve to obtain an emulsion.

This emulsion is diluted 10 times with water, and the wood is immersed in the solution or applied or sprayed onto the surface.

Add 2.5 parts of this emulsion to 975 parts of phenolic, urea, or melamine adhesive used in plywood manufacturing and mix well.
use.

Example 4 30 parts of chlordane, 2 parts of permethrin, 20 parts of pentachlorophenol, 25 parts of 5M-200 (same as above),
Add 23 parts of Kijirole and stir well to mix and dissolve to obtain an emulsion.

The method of use is the same as in Example 3.

Example 5 2 parts of chlordane and 0.2 parts of permethrin were dissolved in 25 parts of trioctyl phosphate, and 50 parts of vinyl chloride raw material resin was dissolved.
1 part, 2.5 parts of tribasic lead sulfate, and 20.3 parts of talc were added and mixed to obtain a vinyl chloride compound for wire coating.

Example 6 7720 parts of chlorine and 4 parts of permethrin were added to 76 parts of diatomaceous earth.
Mix well and grind to obtain a highly concentrated powder.

Dissolve 5 parts of this powder in 30 parts of dioctyl phthalate,
50 parts of vinyl chloride raw material resin, 2.5 parts of dibasic lead phthalate
and 12.5 parts of diatomaceous earth were added and mixed and used as a coating material for electric wires to manufacture electric wires.

Claims (1)

[Claims] 1 Chlordane and 3-phenoxybenzyl 3-(2.
An insecticide that targets pests such as bark beetles and termites that attack wood and synthetic resin-coated electric wires, containing 2-dichlorovinyl)-2,2--)methylcyclopropane-1-carboxylade as an insecticidal ingredient.