JP2002037704A - Insecticidal mat for long time use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insecticidal mat for long time use applied to an electric mosquito-repelling mat type and capable of holding stable insecticidal potential for a long time equal to or more than 5 days. SOLUTION: This insecticidal mat for a long time use is a mat made of a fibrous material, impregnated with a pyrethroid-based insecticidal ingredient having 4.0×10-6 mmHg vapor pressure at 20 deg.C and a volatilization-controlling agent and having 0.56 mg/mm3 maximum liquid retention concentration. The weight ratio of the pyrethroid-based insecticidal ingredient to the volatilization- controlling agent is <3. The pyrethroid-based insecticidal ingredient is impregnated in >50 mg per one sheet of the mat, used by placing on a heat radiation plate having an area of 0.2-0.6 times as large as the bottom area of the mat and heated at 70-170 deg.C. The mat is capable of maintaining an insecticidal potential for a time equal to or more than 5 days.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long-term insecticidal mat containing an insecticidal component.

[0002]

2. Description of the Related Art Conventionally, (1) mosquito coils and (2) electric mosquito mats have been favored as methods for heating and evaporating insecticidal components for the purpose of insect killing. A method of immersing a liquid-absorbing wick in a chemical solution and heating the upper portion of the core to heat and evaporate the chemical solution has also been widely used. Among them, the electric mosquito collecting mat is a fibrous mat impregnated with insecticidal components.
It is placed on a heat radiating plate of substantially the same shape as the mat of the heating and transpiration device, and heated by energization to evaporate the insecticidal component,
The temperature at the center of the heat sink is set in the range of 140 to 180 ° C. The electric mosquito mat is an easy-to-use preparation, but the entire bottom of the mat is heated by the heat sink,
Even if the volatilization modifier is added, the volatilization amount of the insecticidal component decreases with time. For this reason, a single mat is usually designed to replace the mat every day and contains only the pyrethroid-based insecticide used for one day, and it is difficult to develop a long-term insecticide mat due to the characteristics of the formulation. Has been considered. On the other hand, in the case of liquid mosquito collecting, the same pyrethroid-based insecticidal ingredients as in the case of electric mosquito collecting mats are used, but the temperature of the heating element is slightly lower than that of electric mosquito collecting mats due to the configuration in which the upper part of the core is heated indirectly. I have. This method is convenient because the effect is continued for 30 to 60 days just by installing the chemical bottle once, but the fear of liquid leakage and the like is unavoidable.

[0003] Attempts have been made to develop formulations that incorporate the easy-to-use advantages of the electric mosquito collecting mat system and have a long-lasting effect. For example, JP-A-5-194103 and JP-A-6-194103
Japanese Patent No. 192007 discloses a heat-evaporating drug-containing substance obtained by heating a mixture of a thermoplastic resin powder and an inorganic powder and / or an organic powder near the melting point of the thermoplastic resin powder. It is described that the heating temperature can be reduced by using. However, it is difficult to obtain stable transpiration performance over a long period of time, and it has not been put to practical use.

[0004]

SUMMARY OF THE INVENTION The present invention relates to an electric mosquito collecting system in which a fibrous mat containing an insecticidal component is placed on a heat radiating plate to evaporate the insecticidal component. It is an object of the present invention to provide a long-term insecticide mat that can be covered and maintain stable insecticidal efficacy for a long period of 5 days or more.

[0005] To achieve the above object, the present inventors have:
Detailed investigation of the physicochemical properties of the insecticidal components impregnated in the fibrous mat and the effect of the relationship between the area of the mat and the area of the heat sink on the transpiration performance, and heating with a specific mat and specific heat sink It has been found that by combining the transpiration device, the insecticidal efficacy can be continuously maintained for more than 5 days.

[0006]

That is, the long-time insecticidal mat of the present invention has a vapor pressure of 4.0 × 10 at 20 ° C.
^-6 mmHg or higher impregnated with a pyrethroid insecticidal component and a volatilization modifier, the maximum retentate concentration is 0.56 mg / mm
^3. The fibrous mat of item 3, wherein the weight ratio of the pyrethroid insecticide to the volatilization modifier is 3 or less, and the pyrethroid insecticide is 50 m per mat.
g or more and 0.2 to 0.6 of the bottom area of the mat.
It is used by being placed on a heat radiating plate having a double area and a heating temperature of 70 to 170 ° C., and is capable of maintaining insecticidal efficacy continuously for 5 days or more.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The insecticidal component used in the insecticidal mat of the present invention is a highly safe pyrethroid compound.
It is essential that the vapor pressure at 0 ° C. is 4.0 × 10 ⁻⁶ mmHg or more. The vapor pressure is 4.0 × 10 ^-6 mmHg
If it is smaller, a desired effect cannot be obtained even when a heating and evaporating apparatus having a specific heat radiating plate is combined.

[0008] Suitable insecticidal components include, for example, allethrin, framethrin, praletrin, teframethrin (5
-Propargyl-2-furylmethyl 2,2,3,3-tetramethylcyclopropanecarboxylate), terarethrine, empentrin, 5-propargyl-2-methyl-3-furylmethyl 2,2,3,3-tetramethylcyclo Propane carboxylate, transfluthrin,
Fenfluthrin and the like can be mentioned, and can be appropriately selected according to the use and purpose. Among them, allethrin, framethrin, praletrin, and teframethrin are preferable in terms of performance. In the case where an optical isomer or a geometric isomer based on an asymmetric carbon or a double bond exists in the chemical structure, each of them and an arbitrary mixture are of course included in the insecticidal component.

In the insecticidal mat of the present invention, the fiber-based mat is blended with the pyrethroid insecticidal component in an amount of 50 mg or more per sheet. When the amount is less than 50 mg, the insecticidal effect cannot be exerted for a long period. When the fiber mat is impregnated, an undiluted solution to which a stabilizer for the insecticide, a volatilization modifier, a solvent, a fragrance, a dye, and the like are added as necessary, in addition to the pyrethroid-based insecticide, is usually used. However, there is a limit to the maximum amount of the retentate of the mat. For example, for a mat having a size of 22 × 35 mm and a thickness of 2.8 mm, the undiluted solution amount is 1.2 g per sheet.
It is appropriate to keep it within.

[0010] As a stabilizer for the insecticidal component, for example, dibutylhydroxytoluene, dibutylhydroquinone, 2,2
There is 2′-methylenebis- (4-ethyl-6-t-butylphenol) [Yoshinox 425], and as a volatilization modifier, for example, piperonyl butoxide, N- (2-
Ethylhexyl) -1-isopropyl-4-methylbicyclo (2,2,2) oct-5-ene-2,3-dicarboximide [Sinepirin 500], butyl stearate and the like, but of course, are not limited thereto. Not something.

Further, in the insecticidal mat of the present invention, an active ingredient other than the pyrethroid insecticide, for example, a fungicide, a repellent, a bactericidal and antibacterial agent for space such as hinokitiol, linalool, citral, pinene, menthol, terpene alcohols and the like. A multipurpose composition can be obtained by adding an antifungal agent or the like within a range that does not impair the transpiration of the pyrethroid-based insecticidal component.

The insecticidal mat of the present invention is a heating mat having the specific mat and a heat radiating plate having an area 0.2 to 0.6 times the bottom area of the mat and having a heating temperature of 70 to 170 ° C. It is characterized by being combined with a transpiration device. The mechanism by which the transpiration of the insecticidal component from the mat is kept constant is considered as follows. First, when electricity is supplied, the insecticidal component evaporates from the mat located on the heat sink, but since the area of the heat sink is reduced to 0.2 to 0.6 times the bottom area of the mat, the initial evaporation amount is It is not too high like a product. Thereafter, when the power supply is stopped, the insecticidal component of the mat portion located on the non-heated portion moves to the mat on the heat sink so that the concentration gradient of the generated insecticidal component becomes equilibrium. In this way, the desired amount of insecticidal components is always supplied to the mat on the heat sink, so that the amount of transpiration over time within one day is almost constant, unlike conventional products, and the transpiration continues for a long period of 5 days or more. It becomes possible. The occupied portion of the heat radiating plate on the bottom surface of the mat may be the center portion or the side portion of the mat, but is preferably the center portion of the mat in order to obtain more stable performance.

[0013] In the insecticidal mat of the present invention, in particular, as a pyrethroid insecticidal component, arelesrin, framethrin,
It is preferable to use one or two kinds selected from prarethrin and teframethrin.

Further, in the insecticidal mat of the present invention, flamethrin is selected as a pyrethroid insecticidal component, 150 to 400 mg is contained per mat, and 50 to 300 mg of piperonyl butoxide is used as a volatilization regulator.
And the area of the heat sink is preferably 0.5 times the bottom area of the mat.

According to the present invention, by combining the physicochemical properties of the insecticidal component impregnated in the fibrous mat and the relationship between the area of the mat and the area of the heat sink,
A long-term insecticidal mat capable of maintaining insecticidal efficacy continuously for 5 days or more is provided. Examples of the material of the fibrous mat include materials similar to those of the conventional mosquito collecting mat, such as pulp, linter, or a hybrid product thereof. The size and shape of the fibrous mat can be arbitrarily selected, but those of conventional standards are easy to use. This mat has 2
Pyrethroid insecticidal components having a vapor pressure of 4.0 × 10 ⁻⁶ mmHg or more at 0 ° C. are impregnated in an amount of 50 mg or more per sheet. Volatilization modifier, or solvent, fragrance,
It is appropriate to appropriately add a dye or the like to prepare a stock solution of the mat.

Further, the bottom area of the mat is 0.2 to 0.1.
The positional relationship, shape, and the like of the heat radiating plate having a six-fold area and a heating temperature of 70 to 170 ° C. in the heating and evaporating apparatus can be arbitrarily determined. For example, a diameter of 1
A circular heat radiating plate of about 4 to 18 mm or a width of about 8 to 18 mm may be provided, and a support for supporting the periphery of the mat may be provided around the heat radiator. Alternatively, a suitable mounting plate may be provided in place of the support. You may combine so that a clearance may exist between a heat sink and a heat sink.

[0017]

The present invention will be described below in more detail with reference to examples and test examples.

Embodiment 1 FIG. On a fibrous mat having a size of 22 × 35 mm and a thickness of 2.8 mm, 300 mg of d-trans-aresulin (trade name: Esbiothrine) and 200 m of piperonyl butoxide as a volatilization modifier were used.
g, 10 mg of a stabilizer, and a mat stock solution containing a trace amount of a fragrance and a blue dye were impregnated. When the mat was placed and used in a heating and evaporating apparatus having a circular heat radiating plate having a diameter of 16 mm and a heat generation temperature of 150 ° C. in the center and supporting the mat in four places around the heat radiating plate, The amount of d-trans-aresulin evaporated per 12 hours was about 30 mg. This mat exhibited stable transpiration performance and insecticidal efficacy over 10 days, and was excellent in usability without fear of liquid leakage.

Embodiment 2 FIG. On a fibrous mat having a size of 22 × 35 mm and a thickness of 2.8 mm, d-cis and trans-flametrin (trade name: Pinamine Df) are 250 m.
g, 15 parts of piperonyl butoxide as a volatilization regulator
A kerosene solution containing 0 mg, 20 mg of stabilizer and a trace amount of blue dye was impregnated. As the heating and evaporating device, a device having a band-shaped heat radiating plate arranged at the center having an area 0.5 times the mat bottom area was used, and a cycle in which electricity was supplied for 12 hours at night and stopped during the day was continued for 10 days. As a result, the amount of transpiration of d-cis and trans-framethrin was about 20 mg every day, which was stable over time, showing a sufficient mosquito control effect for 10 days.

Test Example 1 Insecticidal mats shown in Table 1 were prepared according to Examples 1 and 2, and loaded into various heat evaporation devices to perform various performance evaluation tests. (1) Transpiration performance: The transpired insecticidal components were trapped by a silica gel packed column at predetermined time intervals, and the insecticidal components were extracted with acetone and analyzed by gaz chromatography to determine the amount of transpiring per hour of the insecticidal components. The values shown in Table 1 are shown as relative ratios when the initial value of each preparation is 1.00. (2) Insecticidal efficacy: The erecting effect on Culex pipiens was evaluated by the following continuous aeration method at predetermined time intervals. The values shown in Table 1 are shown as relative effective ratios when the initial value of the daily mat containing 40 mg of dl, d-cis and trans-arrestrin is 1.00.

(Continuous ventilation method) Inner diameter 20 cm, height 43 c
m plastic cylinders are piled up in two stages, and the inside diameter and height of both are vertically separated by a 16 mesh wire mesh.
cm cylinder (the place to put the mosquito to be tested)
Place a 0 cm, 20 cm high cylinder. The four-tiered cylinder is placed on a table, and a heat evaporation device is placed at the center of the table to evaporate the insecticidal components in the test mat. Then, about 20 test mosquitoes are released into the upper cylinder, and the number of inversions of the mosquitoes over time is observed. Twenty minutes after exposure, all test mosquitoes are transferred to a clean polyethylene container, given 3% sugar water, and examined for mortality 24 hours after storage.

[0022]

[Table 1]

As a result of the test, the long-time insecticidal mat of the present invention combining a specific mat and a heating and evaporating apparatus having a specific heat radiating plate shows excellent transpiration performance and insecticidal efficacy over 5 days or more, and is convenient. Moreover, it was extremely practical. On the other hand, the vapor pressure at 20 ° C. is 4.0 × 10 ⁻⁶ mm
When a pyrethroid insecticidal component smaller than Hg was used (Comparative Example 1), even when the vapor pressure was 4.0 × 10 ⁻⁶ mHg or more, the insecticidal component amount per sheet was less than 50 mg (Control Example 2). ), Satisfactory performance was not obtained either when the conditions of the heat sink were not met (Comparative Examples 3 to 4) or when the drug-containing substance disclosed in JP-A-5-194103 was used (Comparative Example 5). .

[0024]

Industrial Applicability The long-term insecticidal mat of the present invention is a clean preparation without fear of liquid leakage and the like, and can maintain a stable insecticidal effect for a long period of 5 days or more.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B121 CA04 CA35 CA53 CA59 DA60 FA08 4H011 AC01 BA01 BA02 BB15 BC06 BC08 BC19 DA07 DC10 DE06 DF03 DH07

Claims (2)

[Claims] 1. The vapor pressure at 20 ° C. is 4.0 × 10 ^−6.
A maximum retentate concentration of 0.56 mg / mm ³ impregnated with a pyrethroid-based insecticidal component of mmHg or more and a volatilization regulator.
Wherein the weight ratio of the pyrethroid-based insecticide component to the volatilization modifier is 3 or less, and the pyrethroid-based insecticide component is 50 mg per mat.
Impregnated as above, used on a heat sink having an area of 0.2 to 0.6 times the bottom area of the mat and a heating temperature of 70 to 170 ° C., and continuously used for 5 days or more A long-term insecticidal mat characterized by being able to maintain its efficacy. 2. The pyrethroid insecticidal component is allethrin,
2. The long-term insecticidal mat according to claim 1, wherein the mat is selected from the group consisting of framethrin, praletrin and teframethrin.