JPS5995206A - Stable vermin-repelling composition for thermal fumigation - Google Patents

Abstract

PURPOSE:To prepare the titled composition by adding a stabilizer composed of a specific phenolic compound and/or a sorbitan monooleate or their piperonyl butoxide to a repellent having poor thermal stability and high vermin-repelling activity. CONSTITUTION:The titled stable vermin-repelling composition for thermal fumigation can be prepared by using 3-(2-methoxyphenyl)-5-methoxy-1,3,4-oxadiazol- 2(3H)-one as an active component, and adding a phenolic compound of formula (R1 and R2 are OH or -OOC-CH=CH2; R3 and R4 are methyl or ethyl, provided that at least one of R1 and R2 is OH) (preferably both R1 and R2 are OH and R3 and R4 are same methyl or ethyl) and/or sorbitan monooleate or their piperonyl butoxide as a stabilizer. The weight ratio of the active component to the stabilizer is preferably 1 to 0.1-1. USE:A mat fumigant for electrical mosquito-repelling mat.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stable thermal fumigation pest control composition, and more particularly to a composition containing (3-di-methoxyphenyl) as an active ingredient.
-5-methoxy-/, 3゜guoxadiazole-ρ(
The present invention relates to a stable thermal fumigation pest control composition containing JH)-onwo.

3-<,2-methoxyphenyl)-S-methoxy-/,3.41-oxadiazole-2(3H)-
(hereinafter referred to as Compound A) is known to have high pest control activity [D.

Ambroei et al (/?79): P
roc, Br1t, Prot, Conf, P
e5tsand Diseases, , S33 page]
However, it has poor stability, especially thermal stability, and the compound A
There are various restrictions when using these as insecticides and acaricides.

In particular, for example, the compound A may be heated at a temperature of /Sθ°C to 3Sθ
When used in the form of a thermal fumigant at °C, its decomposition is so severe that it is virtually impossible to use it.

The present inventors conducted various studies to enable the use of Compound A as a heat fumigant, and found that Compound A contains a phenol compound and/or sorbitan monooleate represented by the following general formula (1), or It was discovered that by adding these and biperonyl butoxide as a stabilizer, the stability of Compound A was significantly increased and it could be put to practical use as a heat fumigation agent, and the present invention was completed.

R4R3 (wherein R1 and R2 represent the same or different groups, hydroxyl group or group -00C-C!H=CH2,
R3 and R4 are the same or different and represent a methyl group or an ethyl group. However, either one of R1 and R2 is a hydroxyl group. ) That is, the present invention:
Stable heat fumigation containing Compound A as an active ingredient and a phenolic compound represented by the above general formula [I] and/or sorbitan monooleate as a stabilizer, or these and biperonyl butoxide. A pest control composition is provided.

The composition of the present invention exhibits the high insecticidal and acaricidal efficacy of Compound A in exterminating insects even when used in the form of heat fumigation.

The composition of the present invention will be described in detail below. Examples of the phenolic compound represented by the following general formula [I] used as a stabilizer in the composition of the present invention include the following.

(Note) Substituent "4" of the compound represented by the above general formula [I]
+ R2r Contents of R3 and R4.

The amount (weight) of the above-mentioned phenolic compound, sorbitan monooleate or biperonyl butoxide used as a stabilizer in the present invention is to add 7J to Compound A, and add 1 times the weight of 20 minutes to Compound A. However, it is preferable to use an equivalent amount from 79 parts of the weight of the capsicum.

The formulations obtained from the composition of the present invention include, for example, making a mosquito coil by kneading the composition of the present invention into a mosquito coil base material and punching it out in the shape of an incense coil, or by dissolving the composition of the present invention in an organic solvent. A bulb mat is impregnated with the liquid, and if necessary, perfume is added to make it into an electric cloak mat.
The composition of the present invention is kneaded with an inorganic carrier such as talc or clay,
This can be prepared as a granule by placing it in a container that is heated during use and used as a smoking agent, or by impregnating a small block of asbestos, ceramic, alumina, etc. with the composition of the present invention and fumigating it by electric heating during use. can be opened.

Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example/Compound A3θθmg and a phenolic stabilizer represented by compound number (1). 2θθ■ is dissolved in 2 ml of water and impregnated into a porous block made of ceramic having a diameter of 1.5 mm and a thickness of 1 mm to obtain an electrically heated volatilization preparation.

Example Co-Compound A/θθnI9, the phenolic stabilizer somg shown by compound number (3), and a small amount of fragrance were dissolved in hexane/ml, and a regular valve mat for electric mats was impregnated with this to form an electric mat preparation. obtain.

Example 3 Compound A/θθ+y and phenolic stabilizer 50■ shown by compound number (ri) were added to mosquitoes)! y. A mosquito coil preparation is obtained by kneading with an incense stick base material and blowing it out into an incense stick shape.

Example q Each amount of compound A shown in the table below and the phenolic stabilizer shown by compound number (2) were dissolved in βme acetone, and this was poured into a ceramic porous ceramic hole with an angle of σ and a thickness of 8 ρm. Impregnate the board.

When these preparations were tested for insecticidal efficacy by the method described below, very good insecticidal efficacy was obtained as shown in the table below.

Insecticidal efficacy test method: A waist-high glass petri dish (diameter: 79 mm, height: 7 cm) containing a German cockroach adult/θ head was placed in a corner of the floor in a 2 gm' living room, and two of the glass petri dishes were placed. The remaining three glass petri dishes are covered with lids that cover q/5 of the full-width width of the open top part.

2g = A temperature-adjustable electric heater is installed in the center of the living room, the above-mentioned chemically treated ceramic porous plate is placed on it, the electric heater is energized, and fumigation is performed at a constant caloric temperature.

After 2 θ minutes, the cockroaches were collected, transferred to a new container, and fed with food and water for -2 hours to determine the mortality rate after rearing. Example S Compound A, 3θθj, and the phenolic stabilizer/θθ■ shown by the compound number (Incorporated) were dissolved in 2 ml of acetone, and the mixture was dissolved in the Goo angle and thickness/. -2cn1 ceramic porous plate is immersed. On the other hand, Sθθm of only compound A
l:2#Il! A porous ceramic plate of the same shape is impregnated with this in acetone. Each of these is placed in an electric heater and heated at 56°C and 3θθ°C. Place a hanging mirror funnel on top of the heater, and from now on 3θm
A device was constructed so that the air was connected to a Liebig condenser with a length of 100 mm, and then to a glass tube filled with S silica gel (Otsu θ-gθ mesh) and plugged with cotton at both ends. The fumigated Compound A is collected by suction through the device. The collected Compound A was extracted with acetone and analyzed to measure the volatilization rate. The volatilization rate was calculated using the following formula.

The volatilization rate under each condition is as shown in the table below. Number ('7 indicated by , 2J
A fixed amount of 91% of x/-L stabilizer i or sorbitan monooleate was dissolved in 2 ml of acetone, impregnated into a porous ceramic plate similar to Example sl, and volatilized in the same manner as Example j. The rate was measured. Heating temperature is 3θθ°C
And so. As a result, when either the compound number (-) phenolic stabilizer or sorbitan monooleate is added, it states a higher volatilization rate than the unused one.

Example 7 Compound AsθOmg, compound No.
A porous ceramic plate similar to the above was impregnated, and the volatilization rate was measured in the same manner as in Example J. The heating temperature was 3θθ°C.

As a result, the volatilization rate of the compound when the stabilizer was added was 6g, 3%, which is actually higher than the insertion rate θ, 7゜ in the case of no stabilizer as shown in Example B. The rate was obtained.

Claims (1)

[Claims] (1) 3-(!-Methoxyphenyl)-5-methoxy-/ as an active ingredient, 3. Goo oxadiazole
, 2(JR)-one and the following general formula [■
A heated Zelkova 3 vapor pest control composition containing a phenolic compound and/or sorbitan monooleate, or these and biveronyl butoxide. It represents a hydroxyl group or a group -00C-cH=aH2, and R3 and R4 are the same or different and represent a methyl group or an ethyl group. However, either one of R1 and R2 is a hydroxyl group. ) (,) The composition according to claim 1, wherein the phenolic compound represented by the above general formula [■] is a phenolic compound whose substituents R1 and R2 are both hydroxyl groups. (3 ) The phenol compound represented by the above general formula [I] is a phenol compound in which the substituents R1 and R2 are both hydroxyl groups, and R3 and R4 are the same and are methyl groups or ethyl groups. A composition according to claim 1.