KR20000011977A - Aqueous insecticidal preparation for heat fumigation - Google Patents

Abstract

PURPOSE: A liquid pesticide for heat transpiration capable of transpiring stably maintaining an insecticidal effect for a long term is provided, which comprises a compound having at least two carboxyl group and a solubility of at least 1 wt.% in water at 25°C and a disinfestating component. CONSTITUTION: The liquid pesticide for heat transpiration contains a compound having at least two carboxyl group and a solubility of at least 1 wt% in water at 25°C such as a citric acid and a tartaric acid in the content of 0.001-10 wt.%, a disinfestating component like a pyretroid compound in the content of 0.1-15 wt.%. An aqueous auxiliary solvent such as water, alcohol, and glycol in the content of 75-99.8999% is added. By depositing some of a porous liquid absorption core and heat transpirating the rest at 80-180°C, an insecticidal effect comes out.

Description

Aqueous insecticidal preparation for heat fumigation

The present invention relates to an aqueous pesticide for heating transpiration and a method for heating transpiration using the pesticide.

A heat transpiration method of insecticide has been developed and commonly used in which a portion of the porous seam is deposited in a liquid insecticide to absorb the insecticide in the seam, and the water is absorbed by heating the upper portion of the seam. Moreover, as a pesticide used for the said method, the so-called aqueous pesticide which dissolves the pesticidal component in the solvent containing water has come to practical use by the advantage of non-combustibility.

Insecticidal method by heat transpiration method is superior to its method of using mosquito-removing mat and incense, but in terms of its simplicity, safety, and sustainability of effect, in particular, long-term sustainability of the effect has recently been desired.

Under such circumstances, the present inventors have diligently studied the insecticidal method by the heating transpiration method using an aqueous insecticide, and as a result, the aqueous pesticide containing a specific substance is used in the insecticidal method by the heating transpiration method using an aqueous insecticide. The present invention has been completed by discovering that the insecticide can be increased stably for a long period of time, that is, the insecticide effect can be stably maintained for a long period of time compared to the conventional aqueous insecticide.

1 shows an example of an apparatus applied to the aqueous pesticide for heat transpiration or the method for heating transpiration of the present invention.

In Fig. 1, (1) is an aqueous insecticide, (2) is a heating element, (3) is a liquid absorption core, (4) is a container for an aqueous insecticide, and the lower part of the liquid absorption core 3 is an aqueous insecticide (1). ), The insecticide 1 is absorbed by the liquid absorption core 3, and the upper part of the liquid absorption core 3 is heated by the heat generating element 2. As shown in FIG.

The present invention provides an aqueous pesticide for heating transpiration, which comprises a compound having a solubility in water of 1% by weight or more at 25 ° C and containing at least two carboxyl groups and a pesticidal component.

Another object of the invention relates to a pesticidal method by heating transpiration, characterized in that the use of said aqueous pesticide.

Compounds having two or more carboxyl groups for use in the aqueous pesticides of the invention and solubility in water at least 1% by weight at 25 ° C. (hereinafter referred to as compounds of the invention) include, for example, dicarboxylic acids (eg, succinic acid, Adipic acid, tartaric acid, malonic acid, malic acid, citramal acid and the like), and tricarboxylic acids (such as citric acid and the like). Citric acid, tartaric acid and adipic acid are preferred, and citric acid is more preferred.

The concentration of the compounds of the present invention present in the aqueous pesticide is usually from 0.001 to 10% by weight, preferably from 0.01 to 5% by weight, more preferably from 0.05 to 2% by weight.

Insecticidal components for use in the aqueous pesticides of the present invention include, for example, pyrethroid compounds (e.g., allerthrin, bioallerthrin, esbiotrin, praletrin, furamethrin, empentrin, resmethrin, feh) Notreline, permethrin, transfluthrin, teraletrin, silafluorophene, etofenprox and the like).

The concentration of the pesticidal component for use in the aqueous pesticide of the present invention is usually 0.1 to 15% by weight, preferably 0.2 to 5% by weight, more preferably 0.5 to 2% by weight.

Insecticides of the invention include water and water-soluble co-solvents. Water soluble co-solvents for use in the present invention include, for example, hydrophilic solvents such as alcohols such as ethanol, isopropanol, and glycols such as hexylene glycol, diethylene glycol monobutyl ether and the like.

The aqueous pesticide of the present invention contains 75 to 99.899% by weight of water and a water-soluble co-solvent in total. The water content is usually from 15 to 80% by weight, preferably from 30 to 80% by weight, more preferably from 40 to 60% by weight, based on the total amount of water and the water-soluble co-solvent.

The aqueous pesticide of the present invention may contain perfumes, surfactants, colorants, stabilizers and the like.

The aqueous insecticide of the present invention is used by, for example, using the same in the heating evaporation apparatus described in JP-B-52-12106, JP-U-58-45670, JP-B-7-74130, JP-A-7-316002 and the like. It can be applied to the pesticidal method by a heating transpiration method.

The liquid absorbing core for use in the above-mentioned heating transpiration apparatus is not particularly limited as long as it absorbs the liquid insecticide of the present invention and is resistant to heating by a heater or the like. However, a fiber made of glass wool, felt, or the like is used. And what used the sintered compact, and what shape | molded resin powder, such as a polyether sulfone, can be illustrated.

As a pesticidal method by heating evaporation using the aqueous insecticide of the present invention, for example, a portion of the absorbent core, usually a lower part, is deposited in an aqueous insecticide to absorb the insecticide in the shim, and usually a part of the non-deposited portion of the shim is used. For example, a method of increasing the absorbed insecticide by indirectly heating the upper side part at 80 to 180 ° C, preferably 120 to 140 ° C by a heater or the like is included.

Preferred Aspects of the Invention

Hereinafter, the present invention will be described in detail by way of examples.

Example 1

0.8 parts by weight of praletrin and 0.05 parts by weight of citric acid are dissolved in a mixed solvent of hexylene glycol and water (50/50 (w / w)) to obtain 100 parts by weight of an aqueous pesticide.

Example 2

After mixing 49.6 parts by weight of an aqueous 0.1% by weight citric acid solution and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin is dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 3

After mixing 49.6 parts by weight of an aqueous 0.4% by weight citric acid solution and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin was dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 4

After mixing 49.6 parts by weight of 0.5% by weight aqueous citric acid solution and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin are dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 5

After mixing 49.6 parts by weight of a 2% by weight aqueous solution of adipic acid and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of praletrin is dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 6

After mixing 49.6 parts by weight of a 2% by weight aqueous solution of tartaric acid and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin is dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 7

After mixing 49.6 parts by weight of an aqueous 2% by weight citric acid solution and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin is dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 8

After mixing 59.8 parts by weight of a 10.0% by weight aqueous solution of tartaric acid and 39.9 parts by weight of isopropyl alcohol, 0.3 parts by weight of alletrin was dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 9

17.4 parts by weight of an aqueous 4.0% by weight aqueous solution of succinic acid and 69.6 parts by weight of diethylene glycol monobutyl ether were mixed, and then 13 parts by weight of empentrin was dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 10

After mixing 19.9 parts by weight of a 4.0% by weight aqueous solution of succinic acid and 79.8 parts by weight of diethylene glycol monobutyl ether, 0.3 parts by weight of transfluthrin was dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Example 11

After mixing 59.5 parts by weight of 15.0% by weight aqueous citric acid solution and 39.7 parts by weight of isopropyl alcohol, 0.8 parts by weight of alletrin is dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Comparative Example 1

0.8 parts by weight of praletrin are dissolved in a mixed solvent of hexylene glycol and water (50/50 (w / w)) to obtain 100 parts by weight of an aqueous pesticide.

Comparative Example 2

49.6 parts by weight of 0.4% by weight aqueous solution of ascorbic acid and 49.6 parts by weight of hexylene glycol are mixed, and then 0.8 parts by weight of pralethrin are dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Comparative Example 3

After mixing 49.6 parts by weight of an aqueous solution of 2% by weight ascorbic acid and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin are dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Comparative Example 4

After mixing 49.6 parts by weight of 0.4% by weight aqueous solution of benzoic acid and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of praletrin is dissolved in the mixture to obtain 100 parts of an aqueous insecticide.

Comparative Example 5

After mixing 49.6 parts by weight of a 0.2% by weight aqueous solution of salicylic acid and 49.6 parts by weight of hexylene glycol, 0.8 parts by weight of pralethrin is dissolved in the mixture to obtain 100 parts by weight of an aqueous insecticide.

Test Example 1

45 ml of the aqueous insecticide described in Examples 2 to 4 or Comparative Example 1 is placed in a 45 ml container to fix the liquid absorbing core of the porous polyether sulfone thereto. The container is installed in the heated transpiration type insecticide device shown in FIG. 1, and the upper part of the liquid absorption core is indirectly heated at 120-135 degreeC, and this heating test is carried out for the transpiration of the pesticidal component (pratrethrin) in the aqueous insecticide. The amount of volatilization of the pesticidal component is determined by collecting volatilized vapor by suction on a silica gel column for 1 hour, extracting the silica gel column with acetone, concentrating, and quantitatively analyzing by gas chromatography. 10 hours of heating evaporation is continued for 20 days from the start of heating. The volatilization amount (mg / hr) of the pesticidal component (pralethrin) is calculated | required on the 1st day, the 10th day, and the 20th day. The results are shown in Table 1.

Aqueous pesticides 1 day 10 days 20 days Example 2 0.8 0.9 0.8 Example 3 0.6 0.5 0.7 Example 4 0.6 0.5 0.6 Comparative Example 1 0.7 1.3 0

Test Example 2

45 ml of the aqueous insecticide of Examples 2, 5 to 7 or Comparative Example 2 or 3 is placed in a 45 ml container to fix the liquid absorbent core thereto. The container is installed in the heating transpiration type insecticide device shown in FIG. The results are shown in Table 2.

Aqueous pesticides Exterior Example 2 clear Example 5 clear Example 6 clear Example 7 clear Comparative Example 2 Turned brown Comparative Example 3 Browning

Test Example 3

45 ml of the aqueous insecticide described in Examples 2, 5 to 7 or Comparative Examples 1, 4 and 5 are placed in a 45 ml container and the porous polyether sulfone absorbent core is fixed thereto. Subsequently, the vessel is installed in the heated transpiration insecticide apparatus shown in FIG. 1, and the upper part of the absorbent core is indirectly heated at 120 to 135 DEG C to carry out the transpiration test of the aqueous insecticide by this heating. The volatilization rate (%) of the aqueous insecticide after heating 150 hours and 200 hours is calculated | required. The results are shown in Table 3.

Aqueous pesticides 150 hours later After 200 hours Example 2 43.4% 51.2% Example 5 54.4% 64.8% Example 6 38.3% 41.5% Example 7 41.9% 47.0% Comparative Example 1 100% - Comparative Example 4 100% - Comparative Example 5 100% -

According to the present invention, in the insecticidal method by a heating transpiration method using an aqueous insecticide, the aqueous insecticide can be reliably increased for a very long time while maintaining the insecticidal effect stably for a very long time.

Claims (8)

An aqueous insecticide for heated transpiration comprising at least two carboxyl groups and compounds having a solubility of at least 1% by weight in water at 25 ° C. and insecticidal components. (1) a compound having at least 2 carboxyl groups and a solubility in water at least 1% by weight at 25 ° C., (2) insecticidal ingredients, (3) water and (4) a water-soluble co-solvent, wherein the amount of component (1) is 0.001 to 10% by weight, and the amount of component (2) is 0.1 to 15% by weight, respectively, based on the total amount of the preparation; The total amount of components 3) and (4) is 75 to 99.899% by weight, and the amount of component (3) is 15 to 80% by weight based on the total amount of components (3) and (4). Pesticide. The aqueous insecticide according to claim 1 or 2, wherein the pesticidal component is a pyrethroid compound. The aqueous insecticide according to any one of claims 1 to 3, wherein the compound having at least two carboxyl groups and a solubility in water of at least 1% by weight at 25 ° C is citric acid, succinic acid, adipic acid or tartaric acid. Heating comprising depositing a portion of the porous liquid core and heating the non-deposited portion of the liquid core in an aqueous pesticide comprising at least two carboxyl groups and compounds having a solubility of at least 1% by weight in water and a pesticidal component at 25 ° C. Insecticide method by transpiration. The method of claim 5, wherein the heating is performed at a temperature of 80 to 180 ° C. 7. Use of an aqueous insecticide according to any one of claims 1 to 4 for heating transpiration. Use of a compound having at least two carboxyl groups and a solubility in water of at least 1% by weight at 25 ° C. as an transpiration stabilizer for an aqueous pesticide for heated transpiration.