JPH1056937A - Heat-evaporable insecticidal device and liquid absorbing wick therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized heat-evaporable insecticidal device without an insecticide vessel. SOLUTION: This small-sized heat-evaporable insecticidal device comprises a liquid absorptive wick impregnated with a heat-evaporable insecticidal liquid composition composed of a heat-evaporable insecticide of high vapor pressure as the effective component, and a solvent having boiling point of 350 deg.C or below, a heating element which indirectly heats the top side face of the liquid- absorptive wick, and a holder member which holds the liquid-absorptive wick and the heating element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel long-term heat-evaporating drug composition for absorbent cores. More specifically, the present invention relates to a novel long-term heat-evaporated drug composition for an absorbent core, which can be suitably used when evaporating a drug for the purpose of insecticide. Here, a long-time type is a type that is used for 12 hours a day and is used for 30 days or more (ie,
(60 hours or more) This refers to the case where heat evaporation can be performed without clogging of the absorbent core.

[0002]

2. Description of the Related Art JP-A-63-146803 is known as a composition in which the use time is less than 100 hours. However, there is no known composition which can be heated and evaporated with a minimum amount of solvent for a long time without clogging of a liquid absorbent core.

[0003]

[Means for Solving the Problems] The present inventors have conducted intensive studies to develop a pharmaceutical composition which can be heated and evaporated for a long time with a minimum amount of solvent without clogging of the absorbent core. It has been found that the object can be attained by blending the heat-evaporable agent with a solvent having a predetermined boiling point, thereby completing the present invention.

[0004] That is, the present invention relates to a long-term heat-evaporating drug composition for a liquid-absorbing wick, characterized in that the active ingredient of the high-vapor-pressure heat-evaporable drug is mixed with a solvent having a boiling point of 350 ° C or lower. .

[0005] As the high vapor pressure heat transpiration chemical used in the present invention, any of various insecticides conventionally used for controlling pests can be used. The drug includes various pyrethroid insecticides, carbamate insecticides, organophosphorus insecticides, and the like. The following can be illustrated as specific examples thereof.

(S) -2-methyl-4-oxo-3-
(2-propynyl) cyclopent-2-enyl (1R)
-Cis / trans-chrysanthemate (generic name praresulin: trade name ETOK: manufactured by Sumitomo Chemical Co., Ltd .; hereinafter referred to as A)-1-ethynyl-2-methyl-2-pentenyl cis /
Trans-chrysanthemate (hereinafter referred to as B) 1-ethynyl-2-methyl-2-pentenyl 2,2
-Dimethyl-3- (2-methyl-1-propenyl) cyclopropane-1-carboxylate (hereinafter referred to as C) 1-ethynyl-2-methyl-2-pentenyl 2,
2,3,3-tetramethylcyclopropanecarboxylate (hereinafter referred to as D) 1-ethynyl-2-methyl-2-pentenyl 2,2
-Dimethyl-3- (2,2-dichlorovinyl) cyclopropane-1-carboxylate (hereinafter referred to as E) 2-methyl-4-oxo-3- (2-propynyl) cyclopent-2-enylchrysanthemate ( O, O-dimethyl O- (2,2-dichloro) vinyl phosphate (hereinafter, referred to as G) o-isopropoxyphenyl methyl carbamate (hereinafter, referred to as H) And those having a vapor pressure of 3.5 × 10 ⁻⁵ mmHg / 20 ° C. or more.

[0007] Various additives such as an efficacy enhancer, a volatilization rate improver, a deodorant, a fragrance and the like which are usually used can be arbitrarily added to the insecticide. As the potency enhancer, N
-Propylisosome, MGK-264, Sinepirin 2
22, Risen 384, IBTA, S-421, etc., phenethyl isothiocyanate, dimethyl hymixate and the like as volatilization rate improvers, lauric methacrylate (LMA) and the like as deodorants, and citral and citronellal as fragrances Etc. can be respectively exemplified.

The insecticide is prepared in the form of a solution. In the present invention, a solvent having a boiling point of 350 ° C. or lower is used as a solvent for preparing the insecticide solution. As such a solvent, any of various organic solvents, typically, a hydrocarbon solvent can be used, and particularly, the boiling point range is 150 to 35.
Aliphatic hydrocarbons (paraffinic hydrocarbons and unsaturated aliphatic hydrocarbons) at 0 ° C. are preferred. Among them, n-paraffin, isoparaffin and the like have no practical toxicity, no odor and extremely low risk of fire. It is suitable in this respect. Examples of the organic solvent other than the hydrocarbon type include glycerin, propylene glycol, methanol, acetone, xylene, chlorcene, isopropanol, chloroform and the like.

It is preferable that the insecticide solvent solution has a high concentration. Specifically, usually the pesticide concentration is about 6-8.
It is prepared to be 0% by weight, preferably about 10 to 75% by weight, more preferably about 15 to 50% by weight.

The composition of the present invention can be applied to a conventionally known wicking-type heat-evaporating insecticidal apparatus utilizing various kinds of liquid-absorbing wicks, and all of the above-mentioned excellent effects can be obtained. The above-mentioned apparatus to which the composition of the present invention can be applied is, for example, Japanese Patent Publication No. Sho 52-1210.
No. 6, JP-A-58-45670, and the like. One specific example is shown in the attached drawings.

FIG. 1 is a schematic view of a suction-type heat-evaporation type insecticidal apparatus suitable for applying the insecticidal composition for a liquid absorbent core according to the present invention. The apparatus is for supporting a liquid absorbent core (1). An insecticide liquid storage container (3) having a wick support (2), a liquid absorbing wick (1) inserted into the container so as to protrude from the upper part thereof, and an indirectly heating upper surface portion thereof A hollow disk-shaped heating element (4), and a support portion (5) for supporting the heating element (4)
And a heating element support base (7) having support legs (6). The heating element (4) has a cord (not shown) for energizing the heating element to generate heat.

The absorbent core (1) used in the above-mentioned apparatus may be any of various commonly used materials, for example, felt, cotton, pulp, non-woven fabric, asbestos, and inorganic molded products. Cores, pulp cores and inorganic molded cores are preferred. Specific examples of the inorganic molded core include porous ceramics, glass fibers, inorganic fibers such as asbestos hardened with a binder such as gypsum or bentonite, kaolin, activated clay, talc, diatomaceous earth, clay, perlite, and bentonite. Mineral powder such as alumina, silica, alumina silica, titanium, vitreous volcanic rock calcined powder, vitreous volcanic ash calcined powder or the like alone or together with wood flour, charcoal powder, activated carbon, etc., as a paste such as dextrin, starch, gum arabic, synthetic One hardened with glue CMC can be exemplified. A particularly preferred absorbent core is 100% by weight of the above mineral substance powder and 10 to 300 parts by weight of wood flour or a mixture of carbon powder and / or activated carbon up to an equal weight mixed with the wood flour, and a paste is added to the entire absorbent core. It is manufactured by blending until it becomes 5 to 25% by weight of the weight, further adding water thereto, kneading, extruding and drying. The wick has an oil absorption rate of 1 to 40 hours, preferably 8 hours.
Desirably, it is about 21 hours. The oil absorption rate is defined as a diameter 7 mm × length 70 mm in n-paraffin liquid at a liquid temperature of 25 ° C.
Immersed the absorbent core to 15 mm from the bottom, and n-
It means the value determined by measuring the time until paraffin reaches. In addition, the above-mentioned liquid absorbent core may further contain a pigment such as macalite green, a sorbic acid and its salts, a fungicide such as dehydroacetic acid, and the like, if necessary, in addition to the mineral powder, wood flour and paste. Can also.

As the heating element used in the above-described apparatus, a heating element that generates heat by applying electricity is generally used. However, the heating element is not limited to this. For example, a heating element using an air oxidation heating material, a platinum catalyst, or the like is used. Any known heating element such as a material may be used.

The method of killing insects by applying the composition of the present invention to the above-mentioned apparatus may be exactly the same as the conventional method of using this kind of apparatus. What is necessary is just to heat a liquid absorption core. The heating temperature is appropriately determined depending on the kind of the insecticide and the like, and is not particularly limited. The heating temperature is usually about 70 to 150 ° C, preferably 105 to 145 ° C. Core surface temperature about 6
0-135 ° C, preferably about 100-130 ° C.

[0015]

According to the composition of the present invention, long-time heat evaporation can be achieved with minimum solvent without clogging of the liquid absorbing core. Therefore, the chemical solution container can be miniaturized, and further, the chemical solution container can be omitted with only the liquid absorbent core supporting the composition of the present invention.

[0016]

The present invention will be described in more detail with reference to the following examples.

Examples 1 to 23 Insects Nos. A to E shown in Table 1 below, organic solvents and, if necessary, compounds CA, CB or CC were added and mixed at predetermined mixing ratios, and the composition of the present invention was prepared. I got something.

Note that CA, CB and CC indicate the following.

CA: 3,5-di-tert-butyl-4-hydroxytoluene, CB: 3-tert-butyl-4-hydroxyanisole, CC: N, N'-diphenyl-p-phenylenediamine.

[0020]

[Table 1]

The symbols in the solvent column in Table 1 indicate the following.

BA: aliphatic hydrocarbon having a boiling point of 150 to 180 ° C./760 mmHg BB: aliphatic hydrocarbon having a boiling point of 180 to 210 ° C./760 mmHg BC: aliphatic hydrocarbon having a boiling point of 210 to 240 ° C./760 mmHg BD ... aliphatic hydrocarbons having a boiling point of 240 to 270 ° C / 760 mmHg BE ... aliphatic hydrocarbons having a boiling point of 270 to 300 ° C / 760 mmHg BF ... aliphatic hydrocarbons having a boiling point of 300 to 350 ° C / 760 mmHg The vapor pressure of the insecticide is as follows.

A: 3.5 × 10 ⁻⁵ mmHg / 20 ° C., C: 1.6 × 10 ⁻³ mmHg / 30 ° C., D: 3.0 × 10 ⁻³ mmHg / 30 ° C., E: 5.0 × 10 ^-4 mmHg / 30 ° C.

Comparative Example 1 Phthalthrin (manufactured by Sumitomo Chemical Co., Ltd.)
1,3,4,5,6,7-hexahydro-1,3-dioxo-2-isoindolyl) methyl dl-cis / trans-chrysanthemate, vapor pressure 3.5 × 10 ⁻⁸ mmHg
/ 20 ° C.) and 88 wt% BD as solvent to give a comparative composition.

7.5 ml of each of the composition of the present invention prepared in Examples 1 to 4 and the comparative composition obtained in Comparative Example 1 were placed in a container (3) shown in FIG. And heated the upper surface of the liquid absorbent core (1) to a temperature of 115 ° C., and conducted a transpiration test of the insecticide in the composition sample by the heating. A liquid absorbing core (1) was prepared by kneading 60 parts by weight of pearlite and 20 parts by weight of wood flour with 20 parts by weight of starch and water, extruding and drying (diameter 6 mm × length 70 mm, oil absorption rate about 14 hours) ) And the heating element (4) has an inner diameter of 10 mm and a thickness of 10 mm.
Was used. The volatilization amount of the insecticide is collected by suctioning the vaporized vapor into a silica gel column every hour.
The silica gel was extracted with chloroform, concentrated, and quantitatively analyzed by gas chromatography.

After 10 hours from the start of heating the composition sample, 1
Table 2 below shows the results obtained by determining the amount of the insecticide volatilized per hour after 00 hours, 200 hours, 300 hours, and 400 hours in mg / hr.

[0027]

[Table 2]

From the above Table 2, it can be seen that when the composition of the present invention is used, the amount of pesticide volatilized can be remarkably improved, and the improved volatilized amount is almost reduced even after 720 hours from the start of heating. It is clear that the gene can be continuously expressed without any expression.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of an apparatus suitable for applying the drug composition for a liquid absorbent core of the present invention.

[Explanation of symbols]

 (1) Liquid absorbent core (3) Container for containing the composition of the present invention (4) Heating element

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[Procedure amendment]

[Submission date] July 15, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Heat evaporation type insecticidal apparatus and liquid absorbent core

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a medicine for a long time.
Novel heat-transpiration type insecticidal device capable of transpiring a pesticide and its purpose
Liquid absorbent core.

[0002]

2. Description of the Related Art As a conventional heat transpiration type insecticidal apparatus,
Not the first to be developed and put on the market
There is. This means that the mat impregnated with the insecticidal solution is
It was placed on top and heated directly. This type of
Because the active ingredient of the insecticide solution evaporates in a short time.
The transpiration lasts only for a short time of about 8 hours,
Inconvenience, such as the need to replace Also, departure
Since heating is performed by direct contact with the heat,
Transpiration during the period and lacks time stability.
Was.

In order to cope with this, a liquid type
A heat transpiration type insecticidal device was developed. It collects insecticide
Sucks up the drug solution by capillary action
Immerse the lower part of the liquid wick and heat the upper part of the liquid wick with a heating element
Was something. In this, the heating element contacts the absorbent core
Direct heating type and indirect heating with a gap from the absorbent core
Type, but in all cases, containers containing chemicals
, The entire apparatus is bulky.

[0004]

In order to solve the problems of the present invention have, liquid Thailand
Omit the chemical container in the heat evaporation type insecticide
For a long time with a small amount
Intensive research to develop a pharmaceutical composition that can maintain insect effect
As a result, a high vapor pressure heat transpirable
Found that the purpose can be achieved by blending
The present invention has been completed. That is, the present invention provides a high vapor pressure heating and transpiration
Formulation of the active ingredient of the active drug in a solvent with a boiling point of 350 ° C or less
An absorbent core impregnated with the heat-transpired drug composition thus obtained;
A heating element for indirectly heating the upper side surface of the liquid absorbing core;
A holding member for supporting the liquid core and the heating element.
The heat-transpiration type insecticidal device and the holding member
Evaporation of the drug by indirectly heating the held absorbent core with a heating element
The absorbent core for a heat-transpiration type insecticide
And the boiling point of the active ingredient of the high-vapor-pressure transpirable drug is 3
Absorbs the heat-evaporated pharmaceutical composition mixed in a solvent of 50 ° C or less
Liquid absorption for a heat transpiration type insecticidal device characterized by being impregnated
Pertaining to the wick.

[0005] As the high vapor pressure heat transpiration chemical used in the device and the absorbent core of the present invention , any of various insecticides conventionally used for controlling pests can be used. The drug includes various pyrethroid insecticides, carbamate insecticides,
Organic phosphorus insecticides and the like are included. The following can be illustrated as specific examples thereof.

(S) -2-methyl-4-oxo-3-
(2-propynyl) cyclopent-2-enyl (1R)
-Cis / trans-chrysanthemate (generic name praresulin: trade name ETOK: manufactured by Sumitomo Chemical Co., Ltd .; hereinafter referred to as A)-1-ethynyl-2-methyl-2-pentenyl cis /
Trans-chrysanthemate (hereinafter referred to as B) 1-ethynyl-2-methyl-2-pentenyl 2,2
-Dimethyl-3- (2-methyl-1-propenyl) cyclopropane-1-carboxylate (hereinafter referred to as C) 1-ethynyl-2-methyl-2-pentenyl 2,
2,3,3-tetramethylcyclopropanecarboxylate (hereinafter referred to as D) 1-ethynyl-2-methyl-2-pentenyl 2,2
-Dimethyl-3- (2,2-dichlorovinyl) cyclopropane-1-carboxylate (hereinafter referred to as E) 2-methyl-4-oxo-3- (2-propynyl) cyclopent-2-enylchrysanthemate ( O, O-dimethyl O- (2,2-dichloro) vinyl phosphate (hereinafter G) o-isopropoxyphenyl methyl carbamate (hereinafter H) And those having a vapor pressure of 3.5 × 10 ⁻⁵ mmHg / 20 ° C. or more.

[0007] Various additives such as an efficacy enhancer, a volatilization rate improver, a deodorant, a fragrance and the like which are usually used can be arbitrarily added to the insecticide. As the potency enhancer, N
-Propylisosome, MGK-264, Sinepirin 2
22, Risen 384, IBTA, S-421, etc., phenethyl isothiocyanate, dimethyl hymixate and the like as volatilization rate improvers, lauric methacrylate (LMA) and the like as deodorants, and citral and citronellal as fragrances Etc. can be respectively exemplified.

The insecticide is prepared in the form of a solution . As the solvent for preparing the killing <br/> insects solution, boiling point 350
Use a solvent below ℃. As such a solvent, any of various organic solvents, typically a hydrocarbon solvent, can be used. Particularly, aliphatic hydrocarbons having a boiling point range of 150 to 350 ° C. (paraffin hydrocarbons and unsaturated aliphatic hydrocarbons) can be used. Hydrogen) is preferred, and among them, n-paraffin, isoparaffin and the like are suitable because they are practically non-toxic, have no odor, and have a very low risk of fire. Examples of the organic solvent other than the hydrocarbon type include glycerin, propylene glycol, methanol, acetone, xylene, chlorcene, isopropanol, chloroform and the like.

It is preferable that the insecticide solvent solution has a high concentration. Specifically, usually the pesticide concentration is about 6-8.
It is prepared to be 0% by weight, preferably about 10 to 75% by weight, more preferably about 15 to 50% by weight.

The device of the present invention and the liquid absorbent wick can be used in a small amount for a long time.
Use of an insecticide composition that can maintain the insecticidal effect throughout
Suitable for normal use only by impregnating and absorbing the absorbent core
Effective volatilization. But here for reference
For the above composition, using a conventionally known drug solution container
An example in which the invention is applied to a suction-type heat-transpiration type insecticidal device will be described.
You. Such a conventional device is disclosed, for example, in JP-B-52-121.
No. 06, No. 58-45670, and the like. An example is shown in the accompanying drawings.

[0011] Figure 1 is a schematic view of the intake upper heating transpiration type insecticidal apparatus comprising insecticide liquid container (3 having core support for supporting the wick (1) to (2) ), A liquid-absorbing wick (1) inserted into the container with its upper part protruding,
A heating element support having a hollow disk-shaped heating element (4) for indirectly heating its upper surface, a support section (5) for supporting the heating element (4), and a support leg (6). The heating element (4) has a cord (not shown) for energizing the heating element to generate heat.

The insecticidal apparatus according to the present invention comprises
Omit the pesticide liquid container (3) and remove the support leg (6).
Corresponds to the miniaturization. In addition, the present invention relates to
The liquid absorbent core is held in the miniaturized device,
Used without.

The liquid absorbing core may be any of various commonly used materials, for example, felt, cotton, pulp, non-woven fabric, asbestos, inorganic moldings, etc., felt core, sintered core, pulp core and inorganic molded core. Is preferred. Specific examples of the inorganic molded core include porous ceramics, glass fibers, inorganic fibers such as asbestos hardened with a binder such as gypsum or bentonite, kaolin, activated clay, talc, diatomaceous earth, clay, perlite, and bentonite. ,alumina,
Mineral powders such as silica, alumina silica, titanium, vitreous volcanic rock calcined powder, vitreous volcanic ash calcined powder, etc., alone or together with wood flour, charcoal powder, activated carbon, etc., as a paste such as dextrin, starch, gum arabic, synthetic glue CMC Can be exemplified. A particularly preferred absorbent core is 100% by weight of the above mineral substance powder and 10 to 300 parts by weight of wood flour or a mixture of carbon powder and / or activated carbon up to an equal weight mixed with the wood flour, and a paste is added to the entire absorbent core. It is manufactured by blending until it becomes 5 to 25% by weight of the weight, further adding water thereto, kneading, extruding and drying. It is desirable that the liquid absorbing core has an oil absorption rate of 1 to 40 hours, preferably 8 to 21 hours. This oil absorption rate means that a liquid absorbent core having a diameter of 7 mm and a length of 70 mm was placed in an n-paraffin liquid at a liquid temperature of 25 ° C. from below the liquid absorbent core.
It means a value obtained by immersing the sample to 5 mm and measuring the time required for n-paraffin to reach the top of the core. In addition, the above-mentioned liquid absorbent core may further contain a pigment such as macalite green, a sorbic acid and its salts, a fungicide such as dehydroacetic acid, and the like, if necessary, in addition to the mineral powder, wood flour and paste. Can also.

The heating element used in the insecticidal apparatus according to the present invention is generally a heating element that generates heat by energization. However, the heating element is not limited to this. For example, an air oxidation heating material, a platinum catalyst, etc. Any known heating element such as a heating material utilizing the above may be used.

In the insecticidal apparatus of the present invention, the absorbent core is heated to an appropriate temperature at which the composition can evaporate from the absorbent core.
The heating temperature is appropriately determined depending on the kind of the insecticide and the like, and is not particularly limited. The heating temperature is usually about 70 to 150 ° C, preferably 105 to 145 ° C. The core surface temperature corresponds to about 60 to 135 ° C, preferably about 100 to 130 ° C.

In the insecticidal device and the liquid absorbent core according to the present invention ,
By satisfying the desirable conditions described above,
12 hours a day, 30 days or more (ie, 360 hours or less)
Above) It is possible to evaporate without clogging the absorbent core.
it can.

[0017]

EXAMPLES Experimental Example was conducted in order to explain below the present invention in further detail will be described.

[0018] Experimental Example 1 to 23 below first insecticide shown in Table No.A～E, was added and mixed organic solvent and if necessary the compound CA, the respective CB or CC in a predetermined proportion, the invention device And a composition to be used for a liquid absorbing core .

Note that CA, CB and CC indicate the following.

CA: 3,5-di-tert-butyl-4-hydroxytoluene, CB: 3-tert-butyl-4-hydroxyanisole, CC: N, N'-diphenyl-p-phenylenediamine.

[0021]

[Table 1]

The symbols in the solvent column in Table 1 indicate the following.

BA: aliphatic hydrocarbon having a boiling point of 150 to 180 ° C./760 mmHg BB: aliphatic hydrocarbon having a boiling point of 180 to 210 ° C./760 mmHg BC: aliphatic hydrocarbon having a boiling point of 210 to 240 ° C./760 mmHg ... aliphatic hydrocarbons having a boiling point of 240 to 270 ° C / 760 mmHg BE ... aliphatic hydrocarbons having a boiling point of 270 to 300 ° C / 760 mmHg BF ... aliphatic hydrocarbons having a boiling point of 300 to 350 ° C / 760 mmHg The vapor pressure of the insecticide is as follows.

A: 3.5 × 10 ⁻⁵ mmHg / 20 ° C., C: 1.6 × 10 ⁻³ mmHg / 30 ° C., D: 3.0 × 10 ⁻³ mmHg / 30 ° C., E: 5.0 × 10 ^-4 mmHg / 30 ° C.

Comparative Example 1 Phthalthrin (manufactured by Sumitomo Chemical Co., Ltd.)
1,3,4,5,6,7-hexahydro-1,3-dioxo-2-isoindolyl) methyl dl-cis / trans-chrysanthemate, vapor pressure 3.5 × 10 ⁻⁸ mmHg /
A comparative composition was obtained using 12 wt% (20 ° C.) and 88 wt% BD as a solvent.

The present invention eliminates the need for a chemical container and reduces the size of the device.
Here, the basics of the present invention and
Insecticide composition has a small insecticidal effect over a long period of time.
In order to demonstrate that it can be maintained,
Show.

7.5 ml each of the composition for the present invention prepared in Experimental Examples 1 to 4 and the comparative composition obtained in Comparative Example 1 were added to the first
In the container (3) shown in the figure, the heating element (4) was energized to heat the upper surface of the liquid absorbing wick (1) to a temperature of 115 ° C., and the transpiration test of the insecticide in the composition sample by the heating was performed. Was performed. As the liquid absorbing core (1), 60 parts by weight of perlite and 20 pieces of wood flour were used.
20 parts by weight of starch and water were added to the parts by weight, kneaded, extruded and dried (diameter 6 mm × length 70 mm, oil absorption rate about 14
Time), and the heating element (4) has an inner diameter of 10 mm and a thickness of 10 mm.
mm-shaped hollow disk-shaped heating elements were used. The volatilization amount of the insecticide is collected by suctioning the vaporized vapor into a silica gel column every hour.
The silica gel was extracted with chloroform, concentrated, and quantitatively analyzed by gas chromatography.

After 10 hours from the start of heating the composition sample, 1
Table 2 below shows the results obtained by calculating the amount of insecticide volatilized per hour at 00, 200, 300, and 720 hours in mg / hr.

[0029]

[Table 2]

From Table 2, it can be seen that when the above composition is used, the amount of pesticide volatilized can be remarkably improved, and this improved volatilization is hardly reduced even after 720 hours from the start of heating. It is clear that the expression can be sustained.

[0031]

As is clear from the above, the insecticidal device of the present invention is
Clogging of the wick with minimum solvent
Absorbs insecticide composition that allows long-term heat evaporation without using
Since the core is absorbed and impregnated, the chemical solution container is omitted and the device is
Can be miniaturized.

[Brief description of the drawings]

FIG. 1 is a pharmaceutical composition used for the device and the liquid absorbent core of the present invention .
Is a schematic view of an example in which is accommodated in a conventional device.

[Explanation of symbols] (1) Liquid absorption core (3) Container (4) Heating element

Claims (2)

[Claims] 1. A liquid absorbent core impregnated with a heat vaporized drug composition prepared by mixing an active ingredient of a high vapor pressure heat vaporizable drug in a solvent having a boiling point of 350 ° C. or lower, and an upper surface of the liquid absorbent core A heat-transpiration type insecticidal apparatus, comprising: a heating element for indirectly heating the portion; and a holding member for supporting the liquid-absorbing core and the heating element. 2. A liquid-absorbing core for a heat-evaporating insecticidal apparatus in which a liquid-absorbing core held by a holding member is indirectly heated by a heating element to evaporate a drug. 1. An absorbent core for a heat-evaporating insecticidal apparatus, wherein a heat-evaporated drug composition prepared by mixing an active ingredient of a drug with a solvent having a boiling point of 350 ° C. or lower is absorbed and impregnated.