JP2003306406A - Termite-exterminating agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a termite-exterminating agent easily used at a place where conventionally used oil agents or powdery agents are hardly used, and also capable of exterminating the termite living at the place where the conventional agents hardly reach effectively. <P>SOLUTION: This termite-exterminating agent is obtained by dissolving 2,3,5,6-tetrafluorobenzyl (+)-1R,trans-3-(2,2-dichlorovinyl)-2,2- dimethylcyclopropanedicarboxylate in liquefied carbon dioxide gas without using an organic solvent simultaneously, and the method for terminating the termite by spraying the agent is also provided. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a termite control agent and a termite control method.

[0002]

2. Description of the Related Art Various termite control agents have been known so far, but due to recent changes in architectural styles, for example, there are heat insulating materials and hollow portions in the walls, Increasing number of situations where it is difficult to apply oil agents such as. On the other hand, Japanese Examined Patent Publication No. 3-33482 discloses a method for preventing deterioration of wood by spraying a formulation prepared by dissolving an oil agent containing an insecticidal active ingredient in liquefied carbon dioxide onto wood.
Generally, liquefied carbon dioxide has a low ability to dissolve the insecticidal active ingredient, and therefore, an organic solvent is usually used as disclosed in the publication. Therefore, it is not suitable for use in the wall, under the floor, etc., even if it is used outdoors.

[0003]

The present invention has been made to solve the above-mentioned problems, and as an active ingredient,
(+)-1R, trans-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylic acid 2,
3,5,6-Tetrafluorobenzyl [hereinafter referred to as benfluthrin. ] Provides a termite control agent dissolved in liquefied carbon dioxide and a method for controlling termites by spraying the termite control agent.

The benfluthrin used in the present invention is a compound described in JP-A-63-203649, which has a surprisingly high solubility in liquefied carbon dioxide, and a sufficient amount to be used as a termite controlling agent is an organic compound. It can be dissolved in liquefied carbon dioxide without using a solvent. Furthermore, benfluthrin dissolved in liquefied carbon dioxide diffuses evenly in every corner of the heat insulating material and hollow part after spraying,
It is possible to effectively control wood pests such as termites.

In the present invention, benfluthrin is usually contained in the liquefied carbon dioxide gas in a weight percentage of 0.05 to 50%, preferably 0.5 to 20%. In the liquefied carbon dioxide gas, in addition to benfluthrin, synergists such as piperonyl butoxide, octachlorodipropyl ether, and cinepyrine 2
22, Cinepyrine 500 and the like can be added appropriately.

The termite control agent of the present invention is usually used by filling it in a pressure resistant container of 1 to 50 liters made of a material such as iron, aluminum or stainless steel. Further, in order to eliminate the change in the benfluthrin concentration due to the decrease in the amount of liquid in the pressure resistant container, it is preferable to use the termite controlling agent of the present invention in a pressure resistant container having the following internal structure.

That is, the pressure-resistant container is (1) a pressure-resistant container body,
(2) Two communication holes arranged vertically are formed in the vicinity of the lower end portion, and are provided vertically inside the pressure vessel main body.
An inner pipe that connects the inside and outside of the pressure-resistant container body,
(3) A plurality of small-diameter communication holes are formed on the wall surface, and upper and lower end portions are joined to the inner pipe to form an outer pipe that covers the upper and lower positions between the two communication holes in the inner pipe to the vicinity of the upper end portion. Prepare,
Between the inner pipe and the outer pipe, the inner pipe communicates with the inner peripheral side of the inner pipe through a communication hole located on the upper side of the inner pipe, while the outer peripheral side of the outer pipe communicates with the small diameter communication hole of the outer pipe. A space communicating with the inner pipe is formed, and the opening area of the communicating hole located on the upper side of the inner pipe is equal to or larger than the total opening area of the small diameter communicating holes formed in the outer pipe. On the other hand, the opening area of the communication holes located on the lower side of the inner tube is set to be equal to the sum of the opening areas of the small-diameter communication holes formed in the outer tube. preferable.

Examples of the material of the inner tube and the outer tube include copper, copper alloy, stainless steel, etc., and the inner tube has such a length as to reach the bottom of the pressure-resistant container body. The outer diameter of the inner tube is usually 4 ~
12mm, the outer diameter of the outer pipe is usually 2-6 than the outer diameter of the inner pipe
mm is set larger. The outer diameter of the outer tube is usually 120-
About 4 to 6 pieces are provided at intervals of 200 mm, and the diameter thereof is usually 1 to 2 mm. The length of the portion of the lower portion of the inner pipe which is not covered by the outer pipe is usually 2 to 5 mm.
The nozzle for spraying attached to the main body of the pressure-resistant container usually has a nozzle diameter of 0.2 to 3 mm, but the nozzle diameter can be appropriately changed according to the size of the space to be sprayed.

The termite controlling agent of the present invention is used by being sprayed on a place where damage by termites is recognized, such as under the floor or in a wall. At that time, if necessary, it is preferable to drill at several places with an electric drill or the like and spray from each hole for several seconds.

[0010]

EXAMPLE An example of the present invention will be described with reference to FIG. Manufacturing Example As shown in FIG. 1, the pressure vessel is composed of a pressure vessel body 1 having a volume of 3.6 liters, an inner tube 3 and an outer tube 4.
A communication hole 3a located on the upper side and a communication hole 3b located on the lower side are formed in the vicinity of the lower part of the inner pipe 3 so as to be vertically arranged so as to communicate the inside and the outside of the pressure-resistant container body 1. ing. The upper and lower ends of the outer pipe 4 are joined to the inner pipe 3, and the upper and lower positions of the inner pipe 3 between the communication holes 3a and 3b to the vicinity of the upper end are covered. And
A communication hole 3a in the inner pipe 3 is provided between the inner pipe 3 and the outer pipe 4.
A space 5 which communicates with the inner peripheral side of the inner pipe 3 via the through hole 4a and communicates with the outer peripheral side of the outer pipe 4 through a communication hole 4a in the outer pipe 4.
Are formed. Benfluthrin 5 in this pressure vessel
Add 0g. After attaching valve 2, liquefied carbon dioxide
2450 g is filled to obtain the termite controlling agent of the present invention.

Test Example In a cylindrical plastic cup having a diameter of 5 cm and a height of 3.5 cm, 20 termite ( Coptotermes s formosanus ) worker ants and a moistened cotton ball are placed, and a lid with a hole having a diameter of 2 mm is placed. The above plastic cup was put in a plastic bag having a volume of 50 liters, and the termite controlling agent obtained in Production Example was sprayed for 3 seconds or 6 seconds to close the plastic bag. After 4 hours, the plastic bag was opened and the state of the termites was observed the next day. The test was repeated 3 times. The results are shown in Table 1.

[Table 1]

Further, the same test as above was carried out when a lid having no holes was placed. The results are shown in Table 2.

[Table 2] As can be seen from the above table, the termite control agent of the present invention shows an excellent lethal effect even for termites in a plastic cup equipped with a lid without holes, so that it is difficult to reach with conventional agents. Thus, it can be seen that benfluthrin, which is the active ingredient of the termite control agent of the present invention, can be reached.

[0013]

EFFECTS OF THE INVENTION The termite controlling agent of the present invention can easily treat the places where it is difficult to treat conventionally used oils and powders, and also effectively control the termites in places where conventional agents cannot reach. can do.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a state in which a pressure-resistant container is filled with the termite controlling agent of the present invention.

[Explanation of symbols]

1 ... Pressure vessel body 3 ... Inner tube 4 ... Outer tube

Continued front page    (72) Inventor Ichiro Inoue             2-51-3 Akabane, Kita-ku, Tokyo Liquefied carbon dioxide             Within the corporation (72) Inventor Hiroyuki Miyaji             1-2 Kiyohisa-cho, Kuki-shi, Saitama Liquefied carbonate             Inside the company F-term (reference) 4H011 AC03 BA01 BB15 BC18 DA21                       DB05 DD05 DE16

Claims (2)

[Claims] 1. As an active ingredient, (+)-1R, trans-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylic acid 2,3,5,6-tetrafluorobenzyl, Termite control agent characterized by being dissolved in liquefied carbon dioxide without using an organic solvent together 2. (+)-1R, trans-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylic acid 2,3,5,6-tetrafluorobenzyl as an active ingredient, A method for controlling termites characterized by spraying a termite controlling agent dissolved in liquefied carbon dioxide without using an organic solvent together