JPH10182306A - Insecticidal liquid for heat transpiration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insecticidal liquid suitable for heat transpiration for a long period. SOLUTION: This insecticidal liquid is used for a heat transpiratory insecticidal method wherein a liquid absorbing wick 3 is partly immersed in an insecticidal liquid 1 so as to absorb the liquid and the absorbed liquid 1 is transpirated by heating the non-immersed portion of the wick. In this case, the insecticidal active ingredient lies dissolved in a 16-20C normal paraffin combined with 10-15C isoparaffin-based and/or naphthene-based hydrocarbon(s).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insecticidal solution for heat evaporation and a method of heat evaporation.

[0002]

A part of a liquid absorbing core is immersed in an insecticide to absorb the insecticide into the core, and a portion of the core not immersed in the insecticide is heated. In the heat evaporation insecticidal method of evaporating the absorbed insecticide, it is difficult to perform stable evaporation of the insecticide over a long period of time due to a change in the insecticide composition during the heat evaporation process, and to obtain a stable insecticidal effect. Therefore, development of an insecticidal solution for heat transpiration that enables stable transpiration and achieves a stable insecticidal effect has been desired.

[0003]

2. Description of the Related Art On the other hand, Japanese Patent Application Laid-Open No. 7-196418
The publication discloses that in a pesticidal solution for heat evaporation in which 0.3 to 5.0% by weight of flamethrin, allethrin, praletrin, and benfluthulin (transfluthrin) are dissolved as an active ingredient in an oily solvent, the boiling point range of the oily solvent is 200 to 30.
In addition to normal paraffin at 0 ° C, the boiling point range is 250-35.
Isoparaffin and / or naphthenic hydrocarbon at 0 ° C
Although it is proposed to use 0 to 70% by weight, even in this method, the stability of evaporation at the beginning and end of evaporation is not always sufficient.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a pesticidal active ingredient containing 16 to 2 carbon atoms.
By using an insecticide solution dissolved in an isoparaffinic and / or naphthenic hydrocarbon having 10 to 15 carbon atoms together with normal paraffin of 0, it is possible to stably evaporate the insecticide solution and the insecticidal active ingredient. It is possible to maintain a stable insecticidal effect for a long time. That is, in the present invention, a part of the absorbent core is immersed in the insecticide, the insecticide is absorbed into the core, and the part of the absorbent core that is not immersed in the insecticide is heated to absorb the liquid. In the insecticidal solution used in the heat transpiration insecticidal method for evaporating the insecticidal solution, the insecticidal active ingredient is dissolved in isoparaffinic and / or naphthenic hydrocarbons having 10 to 15 carbon atoms together with normal paraffins having 16 to 20 carbon atoms. The present invention provides an insecticidal solution for heat transpiration and a method for heat transpiration and insecticidal use of the insecticide.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As the insecticidal active ingredient used in the present invention, use of a pyrethroid compound is preferred from the viewpoint of insecticidal efficacy and safety. Examples include phenothrin, permethrin, transfluthrin, teraresulin, silafluofen, etofenprox, 1-ethynyl-2-fluoro-2-pentenyl 3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate, and the like. Is usually contained in the insecticidal solution for heat evaporation of the present invention.
It is contained in an amount of 1 to 5% by weight.

The carbon number of 16 to 2 used in the present invention
The normal paraffin of 0 is a linear alkane such as hexadecane, heptadecane, octadecane, nonadecane, eicosane and a mixture thereof, and is usually 5 to 45% by weight, preferably 8% by weight in the insecticidal solution for heat evaporation of the present invention.
-40% by weight.

[0007] The carbon number 10-1 used in the present invention
Examples of the isoparaffin-based hydrocarbon (saturated hydrocarbon having a side chain) of No. 5 include, for example, Isopar M (hydrocarbon solvent mainly composed of an isoparaffin-based hydrocarbon having 12 to 15 carbon atoms) manufactured by Exxon Chemical Co., Ltd. (Hydrocarbon solvent mainly containing isoparaffinic hydrocarbons having 11 to 13 carbon atoms), Isopar H (hydrocarbon solvent mainly containing isoparaffinic hydrocarbons having 11 to 12 carbon atoms), Isopar G (hydrocarbon solvent having 10 carbon atoms) To 11 isoparaffinic hydrocarbons), IP Solvent 1620 manufactured by Idemitsu Petrochemical Co., Ltd.
5, a hydrocarbon solvent containing an isoparaffinic hydrocarbon as a main component), Nisseki Isosol 30 manufactured by Nippon Petrochemical Co., Ltd.
0 (hydrocarbon solvent mainly containing isoparaffinic hydrocarbon having 10 to 13 carbon atoms), Shellsol 71 manufactured by Shell Japan Co., Ltd. (hydrocarbon solvent mainly containing isoparaffinic hydrocarbon having 10 to 12 carbon atoms) ), Shellsol 72 (hydrocarbon solvent mainly composed of an isoparaffinic hydrocarbon having 11 to 15 carbon atoms), Merveille 40 manufactured by Showa Kasei Co., Ltd. (mainly composed of an isoparaffinic hydrocarbon having 11 to 15 carbon atoms) Hydrocarbon solvents), Merveille 30 (a hydrocarbon solvent mainly composed of an isoparaffinic hydrocarbon having 10 to 12 carbon atoms), and the like.

The naphthenic hydrocarbons having 10 to 15 carbon atoms (cycloparaffins; cyclic saturated hydrocarbons) include, for example, Nippon Petrochemical Co., Ltd. Nisseki Naphthesol H (a naphthenic hydrocarbon having 15 carbon atoms). A hydrocarbon solvent as a main component), Nisseki Naphthesol M (C12-13)
A hydrocarbon solvent whose main component is a naphthenic hydrocarbon),
Nisseki Naphthesol L (hydrocarbon solvent mainly containing naphthenic hydrocarbons having 10 to 11 carbon atoms), AF Solvent-4 manufactured by Nippon Oil Co., Ltd. (carbonization mainly containing naphthenic hydrocarbons having 14 carbon atoms) Hydrogen solvent), Shell Japan Co., Ltd. Shellsol D-70 (C12-13)
(A hydrocarbon solvent whose main component is a naphthenic hydrocarbon). Furthermore, Exol D-80 (a naphthenic and isoparaffin having 10 to 13 carbon atoms) manufactured by Exxon Chemical Co., Ltd., which mainly comprises an isoparaffinic hydrocarbon having 10 to 15 carbon atoms and a naphthenic hydrocarbon having 10 to 15 carbon atoms. Exol D-110 (a hydrocarbon solvent mainly composed of a naphthene-based and isoparaffin-based hydrocarbon solvent having 15 carbon atoms), and the like.

The insecticidal solution for heat evaporation of the present invention has a carbon number of 10
-15-isoparaffinic and / or naphthenic hydrocarbons as a main component, and the isoparaffinic and / or naphthenic hydrocarbons are usually 55 to 95% by weight in the insecticidal solution for heat evaporation of the present invention. %. The insecticidal solution for heat evaporation according to the present invention contains an insecticidally active ingredient having 16 carbon atoms.
In addition to normal paraffins having up to 20 carbon atoms, isoparaffinic and / or naphthenic hydrocarbons having 10 to 15 carbon atoms, a bactericide, a synergist, a fragrance and the like may be contained as necessary. Phenolic stabilizers such as BHT and BHA;
It may contain a stabilizer such as a benzophenone-based or benzotriazole-based ultraviolet absorber and a volatilization modifier such as an ester.

The heat-transpiration insecticidal method of the present invention is excellent in controlling various insect pests including sanitary pests such as mosquitoes and flies by applying it to a heat-transpiration type insecticidal apparatus described in, for example, Japanese Patent Publication No. 25885/1990. The effect can be improved. FIG. 1 shows an example of an apparatus used in the heat transpiration insecticidal method of the present invention, in which a part of a porous absorbent core 3 is immersed in an insecticide solution 1 and the insecticide solution is absorbed in the core. And the upper part of the core is heated 2
So that it can be heated.

As the material of the liquid absorbing core, a porous material is usually used. Examples of the porous material include clay, talc, kaolin, diatomaceous earth, gypsum, perlite, bentonite, acid clay, glass fiber, asbestos and the like. Inorganic powder or heat-resistant polymer resin powder of the above is bonded with a paste such as carboxymethylcellulose, starch, gum arabic, gelatin, polyvinyl alcohol, etc., molded and, if necessary, fired. Further, a material obtained by consolidating a heat-resistant polymer resin powder with a thermoplastic resin may be used. In addition, a coloring matter, a preservative, and the like may be appropriately added to the absorbent core.

[0012]

The present invention will be described below in more detail with reference to examples. First, a production example of the insecticidal solution for heat evaporation of the present invention will be described. Production Example 1 1.7 parts by weight of praretrin and 20 parts by weight of heptadecane were obtained from Isopar M (manufactured by Exxon Chemical Co., Ltd .;
5), and the whole was made up to 100 parts by weight to obtain an insecticidal solution of the present invention.

Production Example 2 1.7 parts by weight of praretrin and 30 parts by weight of heptadecane were added to Exol D-80 (manufactured by Exxon Chemical Co., Ltd .;
A hydrocarbon solvent containing 45 to 50% by weight of a naphthenic hydrocarbon of 0 to 13 and about 35% by weight of an isoparaffinic hydrocarbon of 10 to 13 carbon atoms) to make the whole 100 parts by weight. An insecticidal solution was obtained.

Production Example 3 1.7 parts by weight of praletrin and 10 parts by weight of octadecane were dissolved in Isopar M to make the whole 100 parts by weight, thereby obtaining an insecticidal solution of the present invention.

Production Example 4 1.7 parts by weight of praletrin and 10 parts by weight of nonadecane were dissolved in Isopar M to make the whole 100 parts by weight, thereby obtaining an insecticidal solution of the present invention.

Next, a production example of an insecticidal solution used for comparison in a test example described later is shown as a reference example. Reference Example 1 1.7 parts by weight of praletrin and 20 parts by weight of pentadecane were dissolved in Exol D-130 (manufactured by Exxon Chemical Co., Ltd .; a solvent mainly composed of a naphthenic hydrocarbon having 16 or more carbon atoms) to make the whole 100 parts by weight. Thus, an insecticidal solution for comparison was obtained.

Reference Example 2 1.7 parts by weight of praletrin and 40 parts by weight of pentadecane were dissolved in Exol D-130 to make the whole 100 parts by weight.
An insecticidal solution for comparison was obtained.

Reference Example 3 1.7 parts by weight of praletrin was dissolved in neothiozole (manufactured by Chuo Kasei Co., Ltd .; normal paraffin having 12 to 15 carbon atoms) to make the whole 100 parts by weight, to obtain an insecticidal solution for comparison.

Next, test examples will be described. Test Example The insecticidal solution obtained in each of Production Examples 1 to 4 was placed in a 45-ml container, and a liquid-absorbing core (a porous material obtained by binding inorganic powder with a paste) was attached, as shown in FIG. It installed in such a heat evaporation type insecticidal apparatus. 10 adult female Culex pipiens pallens are released into a glass tube 4 cm in diameter and 12 cm in height, and two glass tubes whose both ends are closed with nylon mesh are covered with a plastic cylindrical cover (diameter 18).
cm, height 30 cm) and held vertically, a metal cylinder (diameter 20 cm, height 80 cm) was placed under the cylindrical cover and the bottom of the metal cylinder was preheated as shown in FIG. Install a heat transpiration type insecticidal device, indirectly heat the upper part of the absorbent core to 120-135 ° C, count the number of insects that Culex pipiens knock down,
The KT ₅₀ value (the time required for 50% of the insects to knock down, in minutes) was calculated by the probit method. Also,
The same test was performed for the insecticidal solutions obtained in Reference Examples 1 to 3 for comparison. Table 1 shows the results.

[0020]

[Table 1]

As can be seen from the results in the above table, the boiling point was 270.
In the insecticidal solutions of Reference Examples 1 and 2, in which pentadecane at a temperature of 0 ° C. and Exol D-130 having a boiling point range of 277 to 310 ° C. were used as solvents (see JP-A-7-196418), a decrease in insecticidal efficacy was observed as a whole. In particular, the insecticidal efficacy was significantly reduced at the initial and final stages, and the insecticidal solution of Reference Example 3 using only normal paraffin as the solvent showed a remarkable decrease at the final stage. In contrast, the insecticidal solution of the present invention was able to maintain almost constant insecticidal efficacy.

[0022]

According to the method of the present invention, the insecticidal liquid is stably evaporated for a long time to obtain a stable insecticidal effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of an apparatus used in the method for killing insects by heat evaporation according to the present invention.

[Explanation of symbols]

Reference numeral 1 denotes an insecticide, 2 denotes a heating element, 3 denotes an absorbent core, and 4 denotes a container containing the insecticide.

Claims (4)

[Claims] A liquid absorbent core is immersed in a pesticide solution to absorb the insecticide into the wick, and a portion of the absorbent core that is not immersed in the insecticide solution is heated to absorb the liquid. In the insecticidal solution used in the heat transpiration insecticidal method for evaporating the insecticidal solution, the insecticidal active ingredient is dissolved in isoparaffinic and / or naphthenic hydrocarbons having 10 to 15 carbon atoms together with normal paraffins having 16 to 20 carbon atoms. An insecticidal solution for heat transpiration characterized by comprising: 2. The insecticidal solution for heat evaporation according to claim 1, wherein the content of the normal paraffin having 16 to 20 carbon atoms in the insecticide solution is 5 to 45% by weight. 3. The insecticidal solution for heat evaporation according to claim 1, wherein the insecticidal active ingredient is a pyrethroid compound. 4. A liquid absorbent core is immersed in an insecticide solution to absorb the insecticide solution into the wick, and a portion of the absorbent core not immersed in the insecticide solution is heated to absorb the liquid. In a heat-transpiration insecticidal method for evaporating a pesticidal solution, the insecticidal active component is a mixture of normal paraffin having 16 to 20 carbon atoms and 10 normal carbon atoms.
A heat-transpiration insecticidal method, which comprises using an insecticide solution dissolved in isoparaffinic and / or naphthenic hydrocarbons.