JP2003081708A - Insecticidal mat for long time and method for thermal volatilizing insecticidal method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal volatilizing system applicable to a conventional electric mosquito-repellent tool equipped with a heat radiating plate having the nearly same area as that of a mat, usable together with a conventional mat for one day and capable of sustaining stable insecticidal efficacies over a long time of >=5 days. SOLUTION: This insecticidal mat for a long time is obtained by laminating a pulp plate or a plastic plate having 1.5-3.0 mm thickness, a length in the longitudinal direction nearly equal to that of the mat, the length in the transverse direction of 0.3-0.6 the overall length of the mat and <=0.30 Wm<-1> K<-1> thermal conductivity at 300 K from one lateral end in the transverse direction to the inside onto the base of the mat made of a pulp and having 20-24 mm length, 32-38 mm breadth and 2.0-3.0 mm thickness. The resultant laminate having a clip for fixing the mat in one lateral end in the transverse direction comprises >=50 mg of a pyrethroid insecticidal ingredient and a volatilization regulator in a weight ratio of >=0.3 based on the pyrethroid insecticidal ingredient. The thermal volatilizing insecticidal method comprises using the insecticidal mat.

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 and a volatilization regulator and capable of sustaining an insecticidal effect for a long period of time, and a heat evaporation insecticidal method using the mat.

[0002]

2. Description of the Related Art Conventionally, (1) mosquito coils and (2) electric mosquito mats have been popular as a method for heating and evaporating insecticidal components for the purpose of insecticidal purposes, and in recent years, (3) liquid mosquito coils, namely, Also, a method of immersing an absorbent core in a chemical solution and heating the upper part of the core to heat and evaporate the chemical solution is widely used. Among them, the electric mosquito repellent mat is one in which a mat made of pulp impregnated with an insecticidal component is placed on a heat dissipation plate having substantially the same shape as the mat of the heating evaporation device and heated by energization to evaporate the insecticidal component. Then, the temperature of the central portion of the heat sink is set in the range of 140 to 185 ° 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, usually one mat is designed to replace the mat every day, and only one day's worth of the pyrethroid insecticidal component is mixed therein. On the other hand, the liquid mosquito repellent also uses the same pyrethroid insecticidal component as the electric mosquito repellent mat, but the temperature of the heating element is slightly lower than that of the electric mosquito repellent mat because it indirectly heats the upper part of the core. This method is convenient because the effect lasts for 30 to 60 days just by mounting the chemical solution bottle once, but on the other hand, the danger of liquid leakage is unavoidable.

Attempts have been made to develop a formulation which takes in the advantages of the electric mosquito repellent mat system and is effective for a long period of time. For example, Japanese Patent Application Laid-Open No. 5-17306 discloses a method in which a solid drug-impregnated body and a heating element are used. A method of substantially indirectly heating the drug-impregnated body by interposing a space and / or another material to evaporate the drug for a long period of time is also disclosed in JP-A-5-19410.
No. 3 and Japanese Patent Application Laid-Open No. 6-192007 disclose that a drug-containing body 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 is enclosed in a container. A method of evaporating over a long period of time is disclosed. However, with these methods,
In order to ensure long-term sustainability, it is necessary to attach other members or containers to the chemical impregnated body or heat generating plate. For example, in the conventional one-day mat device having a protective bar, the chemical impregnated body for long term is used. And the one-day mat could not be combined. The present inventors, as a new heating evaporation system,
First, in Japanese Patent Application Laid-Open No. 11-127755, a fibrous mat impregnated with an insecticidal component and a volatilization regulator, which has an area of 0.2 to 0.6 times the bottom area of the mat and We proposed a long-term mat to be used by placing it on a heat sink with a heating temperature of 70 to 170 ° C. In this system as well, when using a new type of electric mosquito repellent, the mat for long-term Can't be used as a 1-day mat. Therefore, there is a demand for the development of a heating evaporation system that can be used both as a long-term insecticidal mat and a daily mat in the conventional electric mosquito repellent device having a heat dissipation plate of approximately the same area as the mat.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to an electric mosquito repellent mat system in which a pulp mat containing an insecticidal ingredient is placed on a heat dissipation plate of a heating element to evaporate the insecticidal ingredient. A long-term insecticidal mat that is applied to a conventional electric mosquito repellent device with an area heat sink, can be used with a conventional 1-day mat, and can maintain a stable insecticidal effect for a long time of 5 days or more, and It is an object of the present invention to provide a heat-transpiration insecticidal method using this.

[0005]

Means for Solving the Problems and Embodiments of the Invention In order to solve the above problems, the inventors of the present invention have proposed a new heating evaporation system (a bottom area of a mat) proposed in Japanese Patent Laid-Open No. 11-127755. When using as a mat for a long time with reference to a heat sink having an area of 0.2 to 0.6 times and a heating temperature of 70 to 170 ° C.,
The heat sink area is substantially 0.2 to 0.6 of the bottom area of the mat.
We examined a configuration that can be doubled. Then, the relationship between the shape of the mat containing the insecticidal component and the heat conduction pattern from the heat sink was investigated in detail, and various tests were conducted to complete the present invention.

That is, the invention of claim 1 has a length of 20 to 2
4 mm, width 32 to 38 mm, thickness 2.0 to 3.0 mm on the bottom surface of the mat, 1.5 to 3.0 mm in thickness, lengthwise from one lateral end to the inside. The length in the direction is substantially equal to that of the mat, the length in the lateral direction is 0.3 to 0.6 times the total length of the mat, and the thermal conductivity at 300K is 0.30 Wm ^-1 K ^-1. The following pulp plate or plastic plate is laminated, and the vapor pressure at 20 ° C. is 4.0 × 10 ⁻⁶ mmHg or more in a laminate provided with a clip for fixing the mat at the one lateral end. The present invention relates to a long-term insecticidal mat containing 50 mg or more of a pyrethroid insecticidal ingredient and a volatilization regulator of 0.3 or more by weight ratio.

The insecticidal component used in the present invention is a highly safe pyrethroid compound, and the vapor pressure at 20 ° C. is 4.0 × 10 ⁻⁶ mmHg or more. Suitable insecticidal components include, for example, allethrin, flamethrin, prarethrin, terrarethrin, transfluthrin, empentrin and the like, which can be appropriately selected depending on the use and purpose. In the case where optical isomers or geometrical isomers based on the asymmetric carbon or double bond are present in the chemical structure, each of them and any mixture are of course included in the insecticidal component of the present invention. is there.

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 and N.
-(2-Ethylhexyl) -1-isopropyl-4-methylbicyclo (2,2,2) oct-5-ene-2,3
-Dicarboximide [Cinepyrine 500], butyl stearate, silicone oil and the like can be given, but of course the present invention is not limited thereto.

In the present invention, 50 mg or more of the above pyrethroid insecticidal component is blended in a pulp mat. If the amount is less than 50 mg, naturally, the insecticidal effect cannot be exerted for a long time. On the other hand, the amount of the volatilization regulator blended is 0. 1 by weight ratio to the pyrethroid insecticide.
It is necessary to be 3 or more, and if it is less than this, the volatilization control effect is inferior and the persistence of the insecticidal effect cannot be obtained. When impregnating the mat made of pulp, in addition to the pyrethroid insecticidal component and the volatilization regulator, if necessary, a stabilizer, a solvent, a fragrance,
An undiluted solution containing a dye or the like is used. However, since the maximum holding amount of the mat is limited, for example, the size is 22
In the case of a mat having a size of 35 mm and a thickness of 2.8 mm, it is suitable to keep the amount of the stock solution within 1.2 g per sheet. Examples of stabilizers for insecticidal components include, but are not limited to, dibutylhydroxytoluene, dibutylhydroquinone, 2,2-methylenebis- (4-ethyl-6-tert-butylphenol) [Yoshinox 425] and the like.

Further, in the present invention, active ingredients other than pyrethroid insecticides, such as acaricides, repellents, hinokitiol, linalool, citral, pinene, menthol, terpene alcohols and other antibacterial agents for space,
It is also possible to add a fungicide or the like to the extent that the transpiration property of the pyrethroid insecticidal component is not impaired to give a multipurpose composition.

The long-term insecticidal mat of the present invention has a thickness of 1.5 to 3.0 mm from one lateral end of the pulp mat impregnated with the undiluted solution to the inside. The length in the vertical direction is substantially the same as that of the mat, and the length in the horizontal direction is 0.3 to 0.6 times the total length of the mat, and 30
Characterized by stacking pulp plates or plastic plates having a thermal conductivity at 0 K of 0.30 Wm ^-1 K ^-1 or less, and a clip for fixing the mat at one lateral end of the laminate. . That is, this insecticidal mat for a long period of time is provided with a space between the heat sink and the heat sink in the substantially half of the bottom surface of the mat, while a pulp plate or plastic plate made of a material having a low thermal conductivity is laminated on the other half surface. The configuration of JP-A-11-1
It corresponds to the heating evaporation system of 27755 publication (places a mat on a radiator plate whose area is 0.2 to 0.6 times the bottom area of the mat and heats it), and as a result of various tests, similarly, over a long period of time. It was observed that it showed excellent transpiration performance.

The laminated pulp or plastic plates are
It is necessary to use a material whose thermal conductivity is as low as 0.30 Wm ^-1 K ^-1 or less. If this value is exceeded, the transpiration pattern will be close to that of the conventional one-day mat, and the merit of the long-term insecticidal mat will not occur. Its thickness is 1.5 to 3.0
It is appropriately determined in the range of mm in consideration of, for example, the shape of the protection bar of the electric mosquito repellent device used. As the material of the pulp board, pulp, linter or a mixed product of these,
Examples of suitable materials for the plastic plate include cork and the like. On the other hand, polypropylene, phenol-based plastics (Bakelite, etc.), epoxy-based plastics, and the like are suitable as the material of the plastic plate, but the material is not particularly limited as long as the above conditions are satisfied.

According to the present invention, the mat has a total lateral length of 0.3.
Pulp plates or plastic plates covering ~ 0.6 times are laminated, and a clip for fixing the mat is provided at one lateral end thereof. The shape of the clip and the means for fixing the mat are not limited at all, and for example, the pressing of a spring or the insert molding of plastic resin can be performed. The clip can also be used as a mat pick, and is convenient because the mat can be attached to the electric mosquito repellent without worrying about touching the medicine of the mat. If the width of the pulp or plastic plate exceeds 0.6 times the total length in the lateral direction of the mat, heating energy will be insufficient and sufficient insecticidal effect will not be obtained, while if it is less than 0.3 times, the transpiration will occur. The pattern is close to the tendency of the conventional one-day mat, and the merit of the long-term insecticidal mat is not generated.

The long-term insecticidal mat of the present invention is preferably prepared by impregnating a laminate of a pulp mat and a pulp plate or a plastic plate with a stock solution containing a pyrethroid insecticide component and a volatilization regulator. The laminate may be attached after impregnating the mat with the stock solution. The insecticidal mat prepared in this manner has a heat sink of approximately the same shape as the mat, and if applied to a conventional one-day electric mosquito respirator having a temperature in the center of 140 to 185 ° C., it will be continuously used for 5 days or more. The evaporation performance can be maintained.

According to a second aspect of the invention, in the structure of the first aspect, polypropylene, phenol-based plastic or epoxy-based plastic is used as the material of the plastic plate.

The invention of claim 3 uses the insecticidal mat for a long time of claim 1 and mounts it on a radiator plate having an area substantially equal to that of the mat and a heating element temperature in the central portion of 140 to 185 ° C. The present invention relates to a heat-transpiration insecticidal method comprising placing and using the same for 5 days or more continuously.

According to a fourth aspect of the present invention, in the structure of the third aspect, polypropylene, phenol plastic or epoxy plastic is used as the material of the plastic plate.

The long-term insecticidal mat thus obtained and the method for heat-evaporative insecticidal use using the mat are applied to a conventional electric mosquito repellent device provided with a heat dissipation plate having substantially the same area as that of the mat. It is extremely useful because it can be used together with a mat for use and has a stable insecticidal effect against harmful insects such as mosquitoes, flies, flies, chironomids for a long time of 5 days or more.

Next, the present invention will be described in more detail with reference to Examples and Test Examples.

EXAMPLE FIG. 1 shows an example of a laminate used in the present invention, and FIG. 2 shows a perspective view of another example. The thickness is 2.2 mm, the length in the vertical direction is substantially equal to that of the laminated pulp mat 1, and the length in the horizontal direction is 0.5 times the total length of the mat. Phenolic plastic (Bakelite) plate 3 (3) provided with a clip 2 for fixing the mat at one end in the direction
The thermal conductivity at 00K was 0.18 Wm ^-1 K ^-1 ). It has a length of 22 mm, a width of 35 mm, and a thickness of 2.8.
mm pulp mat 1 was laminated and fixed. A kerosene solution containing 250 mg of d-cis, trans-flamethrin (trade name: pinamine D-f), 150 mg of piperonyl butoxide as a volatilization adjusting agent, 20 mg of a stabilizer and a trace amount of a blue dye was added to the laminate. It was impregnated to obtain a long-term insecticidal mat of the present invention. When the mat is set and used in the conventional electric mosquito repellent whose core temperature is 178 ° C, it has stable transpiration performance and insecticidal effect for 10 days, and there is no fear of liquid leakage and usability. It was excellent. In addition, a one-day mat can be used for this electric mosquito repellent device, which is convenient because it can be used in combination.

Test Examples The insecticidal mats shown in Table 1 were prepared according to the examples and loaded into a conventional one-day electric mosquito respirator having a center temperature of 180 ° C. to perform various performance tests. The lateral width is indicated by a magnification with respect to the entire lateral length of the mat. (1) Evaporation performance: Evaporated insecticidal components were trapped in a column packed with silica gel at regular intervals, extracted with acetone, and analyzed by gas chromatography to determine the amount of insecticidal components evaporated per hour. 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 at regular intervals. The values shown in Table 1 are shown as relative 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.

[0023]

[Table 1]

As a result of the test, the long-term insecticidal mat of the present invention maintained excellent insecticidal efficacy for 5 days or longer.
On the other hand, a laminated sheet having a small thickness (Comparative Example 1), a laminated sheet having a short width (Comparative Example 3) or a material having a large thermal conductivity (Comparative Example 5) was used as a daily mat. The transpiration pattern was similar and the insecticidal efficacy was inferior. On the other hand, the one having a large thickness of the laminate (Comparative Example 2) and the one having a long width of the laminate (Comparative Example 4) lacked heating energy, and a sufficient insecticidal effect was not obtained from the initial stage.

[0025]

INDUSTRIAL APPLICABILITY The long-term insecticidal mat of the present invention and the method for heat-transpiration insecticidal method using the mat are applied to a conventional electric mosquito repellent device having a heat dissipation plate having substantially the same area as that of the mat.
It can be used in combination with daily mats, and has a stable insecticidal effect against harmful insects such as mosquitoes, flies, flies, chironomids, etc. over a long period of 5 days or more, which is extremely practical.

[Brief description of drawings]

FIG. 1 shows a perspective view of an example of a laminate used in the present invention.

FIG. 2 shows a perspective view of another example of a laminate used in the present invention.

[Explanation of symbols]

1. Pulp mat 2. clip 3. Plastic plate

Claims (4)

[Claims] 1. A bottom surface of a pulp mat having a length of 20 to 24 mm, a width of 32 to 38 mm, and a thickness of 2.0 to 3.0 mm, and a thickness of 1 from the one lateral end toward the inside. .5-3.
0 mm, the length in the vertical direction is substantially equal to that of the mat, and the length in the horizontal direction is 0.3 to 0.6 times the total length of the mat,
Moreover, the thermal conductivity at 300K is 0.30 Wm ^-1 K ^-1
The following pulp plate or plastic plate was laminated, and a vapor pressure at 20 ° C. was 4.0 × 10 ⁻⁶ mm in a laminate provided with a clip for fixing the mat at one lateral end thereof.
A long-term insecticidal mat comprising 50 mg or more of a pyrethroid insecticidal component having an Hg of at least 0.3 and a volatilization adjusting agent having a weight ratio of 0.3 or more. 2. A long-term insecticidal mat according to claim 1, wherein the plastic plate is made of polypropylene, phenolic plastic or epoxy plastic. 3. A pulp mat having a length of 20 to 24 mm, a width of 32 to 38 mm, and a thickness of 2.0 to 3.0 mm has a thickness of 1 from its one lateral end toward the inside. .5-3.
0 mm, the length in the vertical direction is substantially equal to that of the mat, and the length in the horizontal direction is 0.3 to 0.6 times the total length of the mat,
Moreover, the thermal conductivity at 300K is 0.30 Wm ^-1 K ^-1
The following pulp plate or plastic plate was laminated, and a vapor pressure at 20 ° C. was 4.0 × 10 ⁻⁶ mm in a laminate provided with a clip for fixing the mat at one lateral end thereof.
A long-term insecticidal mat containing 50 mg or more of pyrethroid insecticidal component of Hg or more and a volatilization regulator of 0.3 or more by weight ratio to the mat, and a heating element in the central portion having an area substantially equal to that of the mat. A heat-evaporative insecticidal method, which comprises placing on a heat sink having a temperature of 140 to 185 [deg.] C. and using it for 5 days or more continuously. . 4. The heat-evaporative insecticidal method according to claim 3, wherein the plastic plate is made of polypropylene, phenolic plastic or epoxy plastic.