JPS6339803A - Method for controlling insect pest - Google Patents

Abstract

PURPOSE:When dumigating an insecticide to control insect pests, a specific substance which can generate a gas by thermal decomposition is mixed with the insecticide and the mixtue is indirectly heated to vaporize a lrage amount of the insecticide instantaneously by the generated gas over a wide range of area whereby insect pests are controlled without smoke and irritating odor. CONSTITUTION:A substance which generates a gas, mainly nitrogen or carbon dioxide gas by thermal decomposition lower than 300 deg.C, except foaming agents, is mixed with an insecticide and the mixture is indirectly heated, e.g., with a sheet heater, to decompose the substance without combustion and the insecticide is fumigated by the action of the generated gas. The substance generating a gas by thermal decomposition is, e.g., aconitic acid, diaminocbenzoic acid, sodium azide or barium azide. The amount of the gas-generating substance is 1/2-50 times the amount of the insecticide and they are preferably mixed into a paste form.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for exterminating pests by fumigating insecticides, and more specifically, a method for fumigating insecticides intensively in a short period of time to eliminate sanitary pests such as mosquitoes and flies in rooms and other confined spaces. , Concerning a method for exterminating cockroaches, etc.

Conventionally, a common method for exterminating pests by fumigating insecticides in a short period of time is to mix the pesticides with a combustion agent and use so-called fumigants to emit the chemicals by the combustion heat and smoke of the combustion agent. However, it has the following drawbacks.

In other words, in order to quickly release fN from a large amount of insecticide 41,
It is essential to burn a combustion agent that generates strong smoke, and therefore, when using this (IIf agent), there will be an irritating odor, danger to the human body, and fire risk due to the fumes of the above-mentioned combustion agent. In particular, with the above-mentioned smoke agent, thermal decomposition of the insecticide due to combustion heat, resulting in a decrease in effective volatilization rate, that is, a decrease in insecticidal efficiency, and economic loss are unavoidable.

The present invention is capable of evaporating a large amount of insecticide over a wide range at #4 time and effectively, in place of the N rat extermination method using the above-mentioned known smoke agent, and without substantially producing smoke. The purpose of the present invention is to provide a new method for exterminating pests that does not cause problems such as toxicity and odor, and is free from the risk of fire.

That is, in the present invention, when fumigating an insecticide to exterminate pests, the insecticide is mixed with a 4 decomposition force generating substance (excluding a foaming agent), and the mixture is indirectly added to cause combustion. This method is characterized in that the gas-generating substances (excluding the carcinogen) are decomposed without causing any decomposition, and the insecticidal agent is made effective by the action of the four decomposed gases.

In the present invention, as the insecticidal agent, any of the various agents conventionally used in pest control agents can be used.6 Representative agents include the following.

03-AliA/-2-methylcyclobent-2-en-4-one-1-y1vdt-cis/Tofunsucrysanthemate (-Product name: Allethrin2)Product name: Pinamine: Manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Pinamine ) 03-Ali/I/-2-methylcyclopent-2-en-4-one-1-I/I/d-x/Tofunsu Chrysanthemate (local product name: Pinamin Forte: Shōtomo Chemical Co., Ltd.) (hereinafter referred to as Pinamin Foorode) Od-3-7U/So2-methylcyclopent-2
-En-4-one-1-I/L/d-transucrysandemate (Product name Exrin: manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Exrin) 03-Ali/l'-2-methyμcyclopenta-2 -en-4-one-1-iN d
-) Funsu Chrysanthemate (-ff name Bioallethrin, hereinafter referred to as Bioallethrin) ON-(3,4,5,6-tetofhydrophthalimide)-
Methi/L/dl -cis/Tofunsu Chrysantema-
) (-ff name Raftarthrin Trade name Neopinamine: Manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Exmin) Ririsron Forte: Manufactured by Sumitomo Chemical Co., Ltd. (hereinafter referred to as Krisron Forte) 05-(2-Derobagi)
-3-Furi~Methiμ chrysanthemate (-Product name Fuomethrin, hereinafter referred to as Fumethrin) O3-phenoxybendi/L'2.2-dimethy/l/-
3-(2,'2'-dichloro)vinyμcycloglobancarboxylate (- Role name Vermethrin: Product name Exmin: Sumitomo Chemical Co., Ltd., hereinafter referred to as Exmin) 03-Phenoxybenzi lv d-cis/transucry Santemato (-Product name: Fetuthrin: Product name: Smithlin, manufactured by Nishiyu Chemical Co., Ltd., hereinafter referred to as Smithlin) 00,0-methyl 0-(2,2-dichloro)vinyl phosphate (hereinafter referred to as DDVF) OO-isopropoquinphenyl methyl Carbamate (hereinafter referred to as pipen) 00,0-nomethy/I/ 0-(1-methyum4-nitropheny)thionophosphate (L, (hereinafter referred to as sumithion)) 00,0-diethylvO-2-ingrobi/I /4-Methyl-birimisolu+61-thiophosphate (hereinafter referred to as diazinon) OO90-dimethyyvs-(1,2-cyca〃boetokikue-F-A/)-methiophosphate (hereinafter referred to as Mufson) In the present invention, the above-mentioned Various commonly used additives such as efficacy enhancers, volatilization rate improvers, deodorants, fragrances, etc. can be added to the insecticide λ agent into the pressure chamber.

Efficacy enhancers include piperonigtoxide, N-globiμ isome, MG-264, and cinepirin 222.
, Cynevirin 500. Riesen 384, more TA, S
-421, etc., volatilization rate improvers include phenetic isothiocyanate, hymiduxic acid dimethacrylate, etc., deodorants include lauri/L' acid methacrylate-1-(LMA), and fragrances include Ntofu μ, Examples include citronellal.

In the present invention, the gas generated is non-toxic and flammable (excluding blowing agents) used in combination with the above-mentioned insecticides and one additive added as necessary. Instead, a substance that mainly generates nitrogen and/or carbon dioxide gas can be used, preferably &OO.
'It is preferable to have a decomposition temperature of 5 degrees below the CI. Substances that decompose while mainly generating nitrogen gas and carbon dioxide gas when heated include ammonium salts such as ammonium oxalate, ammonium nitrate, ammonium sulfur amino acid, urea and its derivatives, tetofuso-p and its derivatives, guanidine and its derivatives. Hydofuzine derivatives such as guanidine bicarbonate and its derivatives hydrofuzine carbonate, metal azides such as sodium azide, barium azide, lithium azide, pvidium azide, inorganic carbonates such as sodium bicarbonate, aconite Typical pyrolysis gas generating substances include the following: .

Substance that mainly generates md force A a Aconitic acid Decomposition temperature 19=
! ℃b Diaminobenzoic acid 〃190-2
40tC dioxytartaric acid'
110tEd 2,4-dioxy-6-methoxyaroic acid 176t::e 2,3-pyridinedicarboxylic acid
1!115tfN-phenylantophni/I/acid 184t8
Pencey (acetic acid) Substance that mainly generates boiling point nitrogen gas Sodium azide Decomposition temperature 300
'C1 barium azide //
219uj Lithium azide /
/ 115~298Ck Azide~Vidium
〃260-310℃1 Ammonium sulfamate〃 160℃ In the present invention, the mixing ratio of the above pyrolysis gas generating substance (excluding blowing agent) (hereinafter referred to as gas generating substance) to the insecticidal agent is determined to achieve the desired insecticidal effect of the resulting insecticide. It can be selected as appropriate depending on the efficacy, etc., but it is usually better to use at least tA times the amount of the gas-generating substance compared to the insecticide.As the mixing ratio of the gas-generating substance increases, the effective rate of the insecticide increases. However, if there are too many, the effect will not improve. It is preferable to use the gas-generating substance in an amount of about 50% to 50 times the amount of the insecticide, and there are no particular restrictions on the mixture of the above-mentioned insecticide and gas-generating substance. Considering ease of use and ease of use, suitable granules, lumps, pellets,
It is preferable to use a paste, etc., or to mix and enclose them in a hot-melt or magnetic resin bag, etc., and various binders, solvents, etc. can be used depending on the usage type.

In the present invention, various types of mixtures made by mixing the above insecticide and gas-generating substance with appropriate additives as necessary are heated indirectly, and the gas-generating substance contained in the mixture is heated without burning the above-mentioned mixture. is thermally decomposed. In the above, various heat sources can be used that can indirectly heat the mixture to provide a temperature at which the gas-generating substance in the mixture can be decomposed without burning the mixture. Specifically, the following heat sources can be used advantageously.

1) Compounds that generate heat due to hydrolysis reactions such as magnesium chloride, aluminum chloride, chloride/
Examples include substances that react exothermically only by adding water, such as I/V umium and iron chloride.

2) An air heat source that generates heat when energized is exemplified by heavy fibres, such as Nigro Goten, sheet heaters, heaters using semiconductors, and the like.

3) Heat sources using fire 07/l/kofung, candles, gas burners,
Charcoal, kerosene, solid fuel for one zone, gelled alcohol μ,
Can you give an example of a gelled lantern?

4) A combination of a metal or metal compound that generates heat due to an oxidation reaction and cutting, etc., such as a method of mixing iron powder and an oxidizing agent (ammonium chlorate, etc.), a method of mixing a metal and a metal oxidation that has a smaller ionization tendency than gold 14 At least one of iron and potassium sulfate, sulfide #:% metal chloride, iron sulfate, etc.
A method in which a mixture of a metal with a higher ionization tendency than iron and a metal halide with a lower ionization tendency than iron is brought into contact with water, a method in which a mixture of a metal with a higher ionization tendency than iron is brought into contact with water, Examples include a method in which the sulfuric acid mixture is brought into contact with water, and a method in which water is added to a mixture of ammonium and alkali metal nitrate.

5) A method that utilizes the oxidation reaction of metal sulfide, for example, a method in which a mixture of sodium sulfide and carbide is brought into contact with oxygen can be exemplified.

In the present invention, each of the above-mentioned power sources is energized, ? Indirect heating, in which the mixture of the insecticide and the gas generating substance is directly heated by 114 m using the weight of the mixture of the insecticide and the gas generating substance, for example, by contacting with water and/or air, generates heat and uses the weight of the mixture. This is carried out by placing a mixture containing substance 'R in a suitable container and placing a heat source outside the container. More preferably, in order to effectively utilize the heat amount of the heat source, the dust section is housed in a closed outer vessel, and the inner vessel containing a mixture containing an insecticide and a gas-generating substance is housed in the outer vessel. &: 1lf of the mixture generated by the heat generated by the heat source, preferably containing at least part of the wall and side wall as a partition wall.
According to the method of the present invention, the mixture is energized and the gas generating substance in the mixture undergoes a 4 decomposition reaction. By the generated gas, the insecticide in the mixture is forcibly destroyed and its volatilization is promoted, and furthermore, it is rapidly and effectively evaporated in a short period of time after being mixed without being exposed to high temperatures that would cause thermal decomposition or denaturation. Be it.

Therefore, according to the method of the present invention, native pests such as mosquitoes, flies, fleas, bed bugs, dust mites, and cockroaches that live within the limited space of a room or song can be exterminated very effectively. Moreover, the method of the present invention does not utilize the combustion of p5S agents as in conventional methods, and has the advantage that it can be performed safely and easily* without the inherent irritating odor, generation of scorch, or risk of fire. be.

Examples will be given below to explain the present invention in more detail.

In addition, the effective volatilization rate of the insecticide in the examples was calculated by fumigating the insecticide in a closed container, passing the air inside the container into benzene, and collecting the agent in the air in the benzene.
The gas chromatography flow rate after the post moth was measured and expressed as a percentage of the initial insecticidal agent weight.

Example 1 Each insecticide and gas generating substance listed in Table 2 below were mixed and stored in a suitable cylindrical container, and the container was heated externally with an electric heating wire (layer high temperature 300°C) to cool the gas inside the container. The generated substances are thermally decomposed and the insecticide is volatilized. The results of measuring the effective volatilization rate of the insecticide at that time are shown in Table 2 below.

@Table 2 Comparative Example 1 The insecticide was volatilized in the same manner as in Example 1 except that the scum-generating substance was not used. The results are shown in Table 3 below.

Table 3 It is clear from the comparison of Tables 2 and 3 above that according to the method of the present invention, by mixing the insecticidal agent with a scum-generating substance, the same amount of the agent can be heated to the same temperature. It can be seen that it can be volatilized several times to several tens of times more effectively.

Hereinafter, a pyrolysis gas analysis test of the gas generating substance used in the present invention and an insecticidal efficacy test according to the method of the present invention were conducted.

Analysis of pyrolysis gas> For the scum-generating substances used in the present invention (substances described as a-1 above) and cyanamide and dicyancyanide for comparison, each of these was heated up to 300°C (maximum temperature 260°C). ~280°C), and the pyrolysis product was measured using a gas detector tube method.

As a result of the above test, the gas generating substance a-7 used in the present invention
All produced primarily nitrogen gas or carbon dioxide gas.

On the other hand, when cyanamide was heated to a temperature slightly above its boiling point of 215° C., it produced dicyancyanthide and melamine, and dicyancyanide mainly produced amine gas, melamine, and melam. Also, melamine is about 340
It was pyrolyzed by heating to ~350°C to produce near gas.

Insecticidal efficacy test-I> Invention sample &11 and comparative sample &2 below for comparison
Insecticidal efficacy tests were conducted on Nos. 2 and 23 under the following conditions.

(1) Sample Invention: Sample genus 11 was used. B822: A mixture of 0.5 da of Exsan and 10 g of Shiasan. Ratio: nj; /) 3. Ex three 0.5! (2) Test insects (3) Test materials and methods 3, 6 m x 3.6 m x 2.7 m (high Mizuya (40c1nX I O2C1nX l 781
(height)), and a horizontal slit box (5 squares x 100 f 100 ff) and an upper slit box (
50 tomo x 50 birds).

Test insects are placed in each location in the above room (20 in the case of German cattle fishing)
A truncated conical container (bottom inner diameter lOα x height 60 x top inner diameter 12
0. In the case of Kurobo beef yellowtail, cover the top of the container with a piece of gauze to prevent it from escaping), and place the sample A of the present invention in the center of the room.
il is indirectly heated and fumigated as in Example 1. Comparison sample 7 again! For each of L22 and j623, incense sticks are used as an igniter to ignite them, and they are burned and fumigated to prevent ignition. After being left for 2 hours, each test insect was transferred to a rearing case, given water and food, and reared normally. 48 hours after the start of the test, the number of dead insects was counted to determine the mortality rate (%).

The test locations are as follows.

P...In the center of the room, cover the top of the container with a lid with I0 holes of 6 diameters P...In the center of the room, cover the top of the container with a lid with 5 holes of 6 diameters P3...・Inside the horizontal slit box P5 ...Inside the upper slit box P5 ...Inside the top shelf of the Mizuya (shelf door is IC) ff left open) P6 ...Second tier from the bottom of the Mizuya Inside the drawer (pull out the drawer by 10 g) P7...In the bottom shelf of the Mizuya (shelf door is left open by 20 g) (4) Results Do the above tests apply to each sample? The test was carried out twice, and the results obtained are the average values of the two tests, and are shown in Table 4 for the test specimen Mushiri Oj Ushizuri K, and in Table 5 for the test Mushiri oj Ushipuri.

Table 4 Table 5 From Tables 4 and 5 above, direct heating has a low insecticidal effect in indoor spaces where Zushipuri is expected to live, especially in places such as corners of rooms and water interiors. I understand that.

(that's all)

Claims (1)

[Claims] (1) When fumigating insecticides to exterminate pests, the insecticides are thermally decomposed at a temperature of 300°C or less to generate mainly nitrogen gas and carbon dioxide gas (excluding blowing agents). ), the mixture is heated indirectly to thermally decompose the gas-generating substance without combustion, and the insecticide is effectively fumigated by the action of the thermally decomposed gas.