JP3383869B2 - Insecticidal mat for long-term use and method of heat transpiration and insecticidal using the mat - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fibrous mat containing an insecticidal component and a volatilization regulator and capable of maintaining a long-term insecticidal effect, and the above insecticide by placing the mat on a heat dissipation plate of a heating element. The present invention relates to a heat-transpiration insecticidal method for evaporating components.

[0002]

2. Description of the Related Art Conventionally, (1) mosquito coils and (2) electric mosquito mats have been popular as methods for heating and evaporating insecticidal components for the purpose of insecticidal purposes, and in recent years, (3) liquid mosquito coils, namely, A method in which an absorbent core is immersed in a chemical solution and the upper part of the core is heated to heat and evaporate the chemical solution is also popular. Among them, the electric mosquito repellent mat is a fibrous mat impregnated with an insecticidal component placed on a heat dissipation plate of substantially the same shape as the mat of the heating evaporation device, and is heated by electricity to evaporate the insecticidal component. The temperature of the central part of the heat sink is set in the range of 140 to 180 ° C. The electric mosquito mat is an easy-to-use formulation, but since the entire bottom surface of the mat is heated by the heat sink, the volatilization amount of the insecticidal component decreases with time even if the volatilization regulator is added.
For this reason, one mat usually contains only one day's worth of pyrethroid-based insecticidal ingredients designed to replace the mat every day, and it is difficult to develop a long-term insecticidal mat due to the characteristics of the formulation. Has been considered. On the other hand, liquid mosquito repellent uses the same pyrethroid insecticide as in the case of electric mosquito repellent mats, but the temperature of the heating element is slightly lower than that of electric mosquito repellent mats due to the indirect heating of the upper core. There is. This method is 30 ~
It is convenient because the effect lasts for 60 days, but on the other hand, the danger of liquid leakage is unavoidable.

Attempts have also been made to develop a formulation which takes in the advantages of the electric mosquito repellent mat system, which is easy to use, and has a long-lasting effect. For example, JP-A-5-194103 and JP-A-6-
Japanese Patent Laid-Open No. 192007 discloses a chemical substance-containing substance for heat vaporization 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, and a carrier having good thermal conductivity. It is described that the heating temperature can be lowered 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]

DISCLOSURE OF THE INVENTION The present invention provides an electric mosquito repellent mat system in which a fibrous mat containing an insecticidal component is placed on a heat dissipation plate of a heating element to evaporate the insecticidal component. It is an object of the present invention to provide a long-time heat-evaporative insecticidal device which can be overturned and can maintain a stable insecticidal effect for a long period of 5 days or more.

[0005]

In order to solve the above problems, the inventors of the present invention have studied 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. The effect on the transpiration performance was investigated in detail, and it was found that the insecticidal efficacy could be continuously maintained for 5 days or more by combining the heating evaporation device with a specific mat and a specific heat sink, and further studies were conducted. The present invention has been completed.

That is, according to the first aspect of the present invention, a heat radiating plate is provided at the center, and a width of 22 mm and a length of 35 m placed on the heat radiating plate.
In a thermal evaporation insecticidal device capable of heating an insecticidal mat of m at a temperature of 70 to 170 ° C., the insecticidal mat has a vapor pressure at 20 ° C. of 4.0 × 10 ⁻⁶ mmHg or more and pyrethroid insecticidal components and volatilization. A fibrous mat impregnated with a regulator, wherein the weight ratio of the pyrethroid insecticide component to the volatilization regulator is 3 or less, and the pyrethroid insecticide component is impregnated with 50 mg or more per mat. Further, the heat dissipation plate has an area of 0.2 to 0.6 times the bottom area of the insecticidal mat, whereby the insecticidal efficacy can be continuously maintained for 5 days or longer. Heated transpiration insecticidal device.

The insecticidal component used in the present invention is a highly safe pyrethroid compound, and it is essential that the vapor pressure at 20 ° C. is 4.0 × 10 ⁻⁶ mmHg or more. When the vapor pressure is less than 4.0 × 10 ⁻⁶ mmHg,
A desired effect cannot be obtained even if a heating evaporation device having a specific heat radiation plate is combined. As a suitable insecticidal ingredient,
For example, allethrin, flamethrin, pralethrin, teframethrin (5-propargyl-2-furylmethyl 2,
2,3,3-Tetramethylcyclopropanecarboxylate), Terraresulin, Empentrin, 5-Propargyl-2-methyl-3-furylmethyl 2,2,3,3-
Examples thereof include tetramethylcyclopropanecarboxylate, transfluthrin, fenfluthrin, and the like, which can be appropriately selected depending on the application and purpose. Among them, allethrin, flamethrin, prarethrin or teframethrin are preferable in terms of performance. Incidentally, due to the chemical structure,
When optical isomers and geometrical isomers based on asymmetric carbons or double bonds are present, each and any mixture thereof is, of course, included in the insecticidal component of the present invention.

Further, in the present invention, in addition to the above pyrethroid insecticidal component, a volatilization regulator is also an essential component. Examples of the volatilization regulator include piperonyl butoxide, N-
(2-Ethylhexyl) -1-isopropyl-4-methylbicyclo (2,2,2) oct-5-ene-2,3-
Examples thereof include dicarboximide [Cinepyrine 500] and butyl stearate, but the present invention is not limited thereto.

In the present invention, 50 mg or more of the above-mentioned pyrethroid insecticidal component is blended into the fibrous mat. If the amount is less than 50 mg, naturally, the insecticidal effect cannot be exerted for a long period of time. It is also essential that the amount of the pyrethroid insecticidal component impregnated in the mat be 3 or less in weight ratio to the volatilization regulator. The lower limit of this weight ratio is not particularly limited, but is preferably 0.5. That is, the weight ratio of the pyrethroid insecticide component to the volatilization regulator in the long-term insecticidal mat of the present invention is 3: 1 or less, preferably 0.5: 1 to 3: 1. When impregnating the fibrous mat, in addition to the pyrethroid insecticidal component and the volatilization adjusting agent, a stock solution containing a stabilizer, a solvent, a fragrance, a dye, etc., if necessary, is usually used. However,
Since there is a limit to the maximum amount of liquid that can be retained in the mat, for example, for a mat having a size of 22 × 35 mm and a thickness of 2.8 mm, it is appropriate to keep the amount of undiluted liquid within 1.2 g per sheet. . Examples of stabilizers for insecticidal components include dibutylhydroxytoluene, dibutylhydroquinone, and 2,2 ′.
-Methylenebis- (4-ethyl-6-tert-butylphenol) [Yoshinox 425] and the like, but not limited thereto.

Further, in the present invention, active ingredients other than pyrethroid insecticides such as acaricides, repellents, hinokitiol, linalool, citral, pinene, menthol, terpene alcohols and other space germicidal / antibacterial agents, antifungal agents A multipurpose composition can also be prepared by adding agents and the like within a range that does not impair the transpiration property of the pyrethroid insecticidal component.

According to the present invention, there is provided the above-mentioned specific mat, and a heating evaporation device having a radiator plate having an area of 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 the combination of. The mechanism that the transpiration of insecticidal components from the mat is constantly maintained is considered as follows. First, when electricity is applied, the insecticidal component evaporates from the mat portion located on the heat dissipation plate, but since the area of the heat dissipation plate is narrowed to 0.2 to 0.6 times the bottom area of the mat, the initial evaporation amount is conventionally. It's not too high like a product. Then, when the energization is stopped after that, the insecticidal component of the mat portion located on the non-heated portion moves to the mat portion on the heat dissipation plate so that the concentration gradient of the insecticidal component generated becomes equilibrium. In this way, the desired amount of insecticidal components is constantly replenished to the mat on the heat dissipation plate, so that the transpiration amount over the course of one day remains almost constant unlike the conventional products, and the transpiration is continued for a long period of 5 days or more. Is possible. The occupying portion of the heat sink on the bottom surface of the mat may be the central portion or the side portion of the mat, but the central portion of the mat is preferable in order to obtain more stable performance.

According to a second aspect of the present invention, in the structure of the first aspect, the heat radiation plate is a circular heat radiation plate having a diameter of 14 to 18 mm, or a strip-shaped heat radiation plate having a width of 8 to 18 mm and a length of 22 mm. It is a device. The invention of claim 3 is the constitution of claim 1 or 2, wherein the pyrethroid insecticidal component is selected from the group consisting of allethrin, flamethrin, prarethrin and teframethrin, and particularly one or two heat-evaporated insecticides for long time. It is a device. Claim 4
According to the invention of claim 1, in the composition of claims 1 to 3, matting 1 is selected by selecting flamethrin as a pyrethroid insecticidal ingredient.
150 to 400 mg is contained per sheet, 50 to 300 mg of piperonyl butoxide is blended as a volatilization adjuster, and the area of the heat radiating plate is set to 0.5 times the bottom area of the mat.

[0013]

According to the first aspect of the present invention, the physicochemical properties of the insecticidal component impregnated in the fibrous mat, its impregnated amount and the weight ratio with the volatilization regulator, and the mat area and the heat sink. The combination with the area of the above provides a long-term insecticidal mat capable of sustaining the insecticidal efficacy continuously for 5 days or more. As the material of the fibrous mat, the same quality as the conventional mosquito repellent mat such as pulp, linter, or a mixed product thereof can be used. The size and shape are also arbitrary, but conventional standards are easy to use. This mat has a vapor pressure at 20 ° C. of 4.
Pyrethroid-based insecticidal component of 0 × 10 ^-6 mmHg or more is 1
It is impregnated with 50 mg or more per sheet and a weight ratio to the volatilization regulator of 3 or less, but in consideration of the production process, application and purpose, a stabilizer, a solvent, a perfume, which is suitable for the insecticidal component and the volatilization regulator, It is suitable to prepare a mat stock solution by appropriately adding a dye or the like.

The bottom area of the mat is 0.2 to 0.
The positional relationship, shape, and the like of the heat dissipation plate having a six-fold area and a heating temperature of 70 to 170 ° C. can be arbitrarily determined. For example, a diameter of 14-18m in the center
A circular radiator of about m or a strip-shaped radiator with a width of about 8 to 18 mm may be provided, and a supporting column that supports the peripheral portion of the mat may be arranged around it, or an appropriate mounting plate may be used instead of the supporting column. They may be combined so that there is a gap with the plate.

According to the second aspect of the present invention, the shape and size of the heat dissipation plate provided in the heating and evaporation device are defined, so that the heating and evaporation insecticidal device for a long time with excellent performance is provided more specifically. According to the configuration of claim 3, since the pyrethroid insecticidal component selected from the group consisting of allethrin, flamethrin, prarethrin and teflamethrin is used, a heat-evaporative insecticidal device for a long time with superior performance is provided. It According to the constitution of claim 4, the optimum amount of flamethrin as a pyrethroid insecticidal component, and piperonyl butoxide as a volatilization regulator of flamethrin, and their compounding amounts are selected, and the efficiency of the heat sink area with respect to the area of the mat is selected. Since the specific ratio has been specified, a long-term heat-evaporative insecticidal device with even better performance is provided.

[0016]

EXAMPLES The present invention will be described in more detail with reference to Examples and Test Examples.

Example 1 300 mg of d-trans-allethrin (trade name: Sbiothrin) was added to a fibrous mat having a size of 22 × 35 mm and a thickness of 2.8 mm, and piperonyl butoki as a volatilization regulator. The side was impregnated with a mat stock solution containing 200 mg, a stabilizer 10 mg, a trace amount of a fragrance and a blue dye. When the mat was placed and used on a heating evaporation device that had a circular heat dissipation plate with a diameter of 16 mm and a heat generation temperature of 150 ° C in the center, and pillars supporting the mat were arranged at four places around it, the mat was placed for 1 day. The transpiration amount of d-trans-allethrin per 12 hours was about 30 mg. This mat is 10
It had stable transpiration performance and insecticidal effect over a period of time, and there was no fear of liquid leakage, and it was excellent in usability.

Example 2 On a fibrous mat having a size of 22 × 35 mm and a thickness of 2.8 mm, 250 mg of d-cis, trans-flamethrin (trade name: Pinamine D-f) and pipette as a volatilization adjusting agent were used. Lonyl butoxide 150 mg, stabilizer 20 m
It was impregnated with a kerosene solution containing g and a trace amount of blue dye. As the heat evaporation device, one having a strip-shaped heat radiating plate having an area 0.5 times the bottom area of the mat and arranged in the center is used.
The cycle of energizing for 2 hours and resting in the daytime was continued for 10 days. As a result, the transpiration amount of d-cis and trans-flamethrin was about 20 mg each day, which was stable over time,
It showed a sufficient mosquito control effect for 10 days.

Test Example 1 In accordance with Examples 1 and 2, the insecticidal mats shown in Table 1 were prepared and loaded into various heating evaporation devices to perform various performance tests. (1) Transpiration performance: The transpirationd insecticidal component was trapped in a silica gel-filled column every predetermined time, extracted with acetone, and then analyzed by gas chromatography to determine the transpiration amount of the insecticidal component. The values shown in Table 1 are shown as relative ratios when the initial value of each preparation was 1.00. (2) Insecticidal effect: The supine effect on Culex pipiens was evaluated by the following continuous aeration method every predetermined time. 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-allethrin was 1.00.

(Continuous ventilation method) Inner diameter 20 cm, height 43c
m plastic cylinders are stacked in two steps, and 16 mesh meshes are used to divide the cylinder into upper and lower parts.
Place a 0 cm cylinder (where the sample mosquito is placed) and then a cylinder with an inner diameter of 20 cm and a height of 20 cm. The four-tiered cylinder is placed on a table, and a heating evaporation device is placed at the center of the table to evaporate the insecticidal component in the test mat. Then, about 20 test mosquitoes are released in the upper cylinder, and the number of ups and downs of the mosquito is observed over time. After 20 minutes of exposure, all test mosquitoes are transferred to a clean polyethylene container, 3% sugar water is given, and the mortality rate is examined after 24 hours of storage.

[0021]

[Table 1] ─────────────────────────────────── Ingredients in the mat Heat sink (mg / mat ) ─────────────────────────────────── Insecticidal ingredients ¹⁾ Other ingredients ²⁾ Size ³⁾ Temperature (° C.) ─────────────────────────────────── Example (present invention) 1 A ₁ 300 B ₁ 200 Diameter 16 mm (0.26) 150 * Supporting pillar 2 A ₂ 250 B ₁ 150 Center 17 × 22 mm strip 120 (0.49) 3 A ₃ 80 B ₂ 100 Center 12 × 22 mm strip 165 (0.34) 4 A ₄ 300 B ₃ 200 Diameter 14 mm (0.20) 80 * Struts around 5 A ₅ 400 B ₁ 200 17 x 22 mm on one half side 160 Band (0.49) 6 A ₆ 250 B ₄ 100 Diameter 16 mm (0.26) 100 * Around mounting plate 7 A ₇ 300 B ₅ 150 21 × 22 mm strip surface 130 (0.60) in the center ──────────── ──────────────────────── Comparative example 1 A ₈ 200 B ₁ 50 Diameter 16 mm (0.26) 170 * Strut 2 A ₁ 40 B around ₁ 100 Diameter 16 mm (0.26) 145 * Struts around 3 A ₁ 300 B ₄ 200 25 x 37 mm (1.00) 140 * Conventional heat sink 4 A ₁ 300 B ₁ 200 Diameter 7 mm (0.05) 125 * strut 5 ⁴ _{around) a 1 300 - 25 × 37mm} (1.00) 170 * conventional heat radiating plate ───────────────────────── ────────── ¹⁾ Abbreviations for insecticidal components have the following meanings, and the number in parentheses is 2. Represents vapor pressure (m mHg) at 0 ° C .: A ₁ : esbiothrin (4.2 × 10 ⁻⁵ ), A ₂ : d-cis, trans-flamethrin (1.3 × 10 ⁻⁴ ), A ₃ : Praletrin (3.5 × 10 ^-5 ), A ₄ : Empentrin (6.5 × 10 ^-4 ), A ₅ : dl, d-cis, trans-allethrin (4.2 × 10 ^-5 ), A ₆ : transfluthrin (4.0 × 10 ⁻⁶ ), A ₇ : terrarethrin (2.2 × 10 ⁻⁴ ), A ₈ : d-cis, trans-phenothrin (1.4 × 10 ⁻⁷ ) ²⁾ Abbreviations for other components have the following meanings: B ₁ : piperonyl butoxide, B ₂ : isopropyl myristate, B ₃ : silicone oil, B ₄ : cinepyrine-500, B ₅ : butyl stearate ³⁾ Heat dissipation The size of the plate is shown, and the area in parentheses indicates the area ratio to the mat. * After that, the other features of the heat sink are shown. ⁴⁾ An inorganic powder solid preparation containing only S-biothrin.

[Table 2] ───────────────────────────────────                 Transpiration performance Insecticidal efficacy ───────────────────────────────────         Initial 2 days after 5 days Initial 2 days after 5 days ─────────────────────────────────── Example (Invention)   1 1.00 0.94 0.88 1.26 1.20 1.15   2 1.00 0.95 0.90 1.50 1.41 1.34   3 1.00 0.92 0.85 1.23 1.17 1.12.   4 1.00 0.93 0.86 1.19 1.10 1.03   5 1.00 0.93 0.88 1.21 1.16 1.12.   6 1.00 0.96 0.90 1.32 1.23 1.18   7 1.00 0.94 0.86 1.24 1.17 1.10 ─────────────────────────────────── Control example   1 1.00 0.64 0.47 0.30 0.24 0.13   2 1.00 0.23-1.29 0.21-   3 1.00 0.57 0.04 1.36 0.63-   4 1.00 0.86 0.78 0.74 0.65 0.59   5 1.00 0.80 0.63 1.05 0.82 0.56 ───────────────────────────────────

As a result of the test, the present invention in which a specific mat and a heating evaporation device having a specific heat dissipation plate are combined, shows excellent evaporation performance and insecticidal efficacy for 5 days or more, which is convenient and extremely practical. It was In contrast, when a pyrethroid insecticidal component having a vapor pressure at 20 ° C. of less than 4.0 × 10 ⁻⁶ mmHg was used (Control Example 1), the vapor pressure was 4.
Even if it is 0 × 10 ⁻⁶ mmHg or more, if the amount of insecticidal component per sheet is less than 50 mg (control example 2), if it does not meet the conditions of the heat dissipation plate (control examples 3 and 4) or JP-A No. 1
When the drug-containing body disclosed in Japanese Patent Laid-Open No. 94103 was used (Control Example 5), no satisfactory performance was obtained.

[0023]

According to the invention of any one of claims 1 to 4, a long-term insecticidal mat capable of sustaining a stable insecticidal effect for a long period of 5 days or more in a clean preparation without fear of liquid leakage. By combining the above and a heat radiator having a specific heat radiation plate, an extremely practical heating and evaporation insecticidal device that is an electric mosquito repellent mat system and is effective for a long period of time is provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A01M 1/20 A01N 25/18 103 A01N 53/04

Claims (4)

(57) [Claims] 1. An insecticidal mat having a width of 22 mm and a length of 35 mm, which is provided with a heat radiating plate in the central portion, and which is 70 to 17 in width.
In a heating evaporation insecticidal device capable of heating at a temperature of 0 ° C., the insecticidal mat has a vapor pressure at 20 ° C. of 4.0 × 1.
A fibrous mat impregnated with a pyrethroid insecticidal component of 0 ^-6 mmHg or more and a volatilization regulator, wherein the weight ratio of the pyrethroid insecticidal component to the volatilization regulator is 3 or less, and the pyrethroid insecticide is Each mat is impregnated with 50 mg or more, and the heat dissipation plate has a bottom area of 0.2 of the insecticidal mat.
A heat-evaporative insecticidal device for a long time characterized in that the insecticidal efficacy can be continuously maintained for 5 days or more by having an area of 0.6 to 0.6 times. 2. The heat dissipation plate is a circular heat dissipation plate having a diameter of 14 to 18 mm, or a width of 8 to 18 mm and a length of 22 m.
The long-term heat-evaporative insecticidal device according to claim 1, which is a strip-shaped radiator plate of m. 3. The pyrethroid insecticidal component is allethrin,
The long-time heat-evaporative insecticidal device according to claim 1 or 2, which is selected from the group consisting of flamethrin, prarethrin, and teframethrin. 4. A mat contains 150 to 400 mg of flamethrin as a pyrethroid insecticide and 50 to 300 mg of piperonyl butoxide as a volatilization adjuster, and the area of the heat sink is 0.5 times the area of the bottom of the mat. The heat-transpiration insecticidal device for a long time according to any one of claims 1 to 3.