JPH10298016A - Fumigant composition and fumigation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain granules which can transpire medicines in high concentration without decreasing the volatilization rates of medicines even though the granules contain medicines in high concentration in the fumigant fumigated by a indirect heating method and to provide a method of fumigation. SOLUTION: In order to fumigate a medicine for fumigation, an organic foaming agent is mixed as a transpiration auxiliary with the medicine for fumigation. In the fumigant by indirectly heating the mixture, the organic foaming agent containing nitrocellulose is utilized as the transpiration auxiliary. It is preferable that azodicarboxamide is used as the organic foaming agent and permethrin is utilized as the medicine for fumigation. Fumigation is carried out by indirect heating due to the reaction heat between calcium oxide and water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fumigant composition and a fumigating method for fumigating a fumigant, and more particularly to a fumigant composition and a fumigating method having a high volatilization rate of the fumigant.

[0002]

2. Description of the Related Art Conventionally, as a method for exterminating or disinfecting pests by volatilizing chemicals such as insecticides and bactericides in the air in a short period of time, the insecticides and bactericides (hereinafter simply referred to as "pesticides") have been used. ) Is mixed with a combustible, and the insecticide is released into the atmosphere by the heat of combustion of the combustible and the generated gas. In this system, considerable smoke is generated together with the gas along with the combustion. In order to generate it, the drug used for it is called a fumigation agent or a fumigant, and a system using this so-called fumigation agent or fumigant was common. However, in this method, in order to quickly evaporate a large amount of insecticide into the atmosphere in a short period of time, it is essential to use a burning agent that generates highly toxic smoke. For this reason, fumigation of a fumigation agent or a fumigant entails a danger to the human body and a danger of fire due to smoking. For example, a smoking agent in which an organic foaming agent is mixed with an insecticide is described in Japanese Patent Publication No. 1-2802. In this smoking agent, nitrocellulose or the like is used as a burning agent, and the blowing speed of the smoke is reduced. By setting the speed to 1.2 m / sec or more, a self-extinguishing property is given, thereby trying to eliminate the risk of fire.

In the heating method for fumigating a fumigant, the form of ignition heating is, for example, a jet agent or a rod agent, and the form of indirect heating is a chemical reaction method or an electrothermal heating method. There are methods. As the chemical reaction method, for example, there are methods such as a heat generation type and an air oxidation heat generation type, and among these, the heating type of the heat generation type is a method in which a fumigation agent is heated indirectly, and there is a danger to a human body. It is a safe heating method with no danger of fire. As a case where the fumigating agent is heated and fumigated by the indirect heating, Japanese Patent Publication No. 58-28842 and Japanese Patent Publication No. 59-49201 disclose a fumigant obtained by mixing an organic foaming agent as a transpiration aid with the fumigating agent. A method for controlling pests by indirectly heating an agent or a material for controlling pests is described. Further, in the fumigating method by the indirect heating method, a fumigant in which nitrocellulose, an inorganic powder and a saccharide are mixed with a fumigating agent is known (Japanese Patent Publication No. 63-41).
No. 881), the nitrocellulose is decomposed by indirect heating, and the fumigation agent in the mixture is forcibly dissipated by the gas produced by the thermal decomposition reaction.

[0004] On the other hand, in the system described in Japanese Patent Publication No. 21802/1990 of the direct heating type, nitrocellulose is used as a burning agent, and the organic foaming agent is decomposed by the heat of the combustion to produce a large amount. A smoke method (the above-mentioned ignition heating method) in which a pesticide is diffused by generating gas is employed. In this method, combustion is performed in a smoke agent containing the pesticide. Therefore, there was a thermal decomposition of the insecticide due to the heat of combustion and a reduction in the effective volatilization rate of the insecticide. In addition, Japanese Patent Publication No. 58-28842 and Japanese Patent Publication No. 59-49201, in which one of the fumigation drugs (hereinafter sometimes referred to as “drugs”) and an organic foaming agent are mixed and heated indirectly. The pest control method belonging to the method of indirectly heating a fumigant described in the fumigant containing a high concentration of the drug may decrease the volatilization rate of the active ingredient (drug) when the amount of the drug in the fumigant increases. It was difficult to commercialize the agent.

Further, in the indirect heating method, when the method described in JP-B-63-41881 contains nitrocellulose, an inorganic powder and saccharides as a transpiration aid,
Due to the indirect heating, the thermal decomposition rate of nitrocellulose was slow, and the volatilization rate of the active ingredient (drug) was low. In addition, in the indirect heating method, a water heating method using heat of reaction between quick lime (calcium oxide) and water is often adopted because it is safe and simple because it does not involve combustion, but this method is used. In some cases, the volatilization rate of the active ingredient may decrease with a decrease in the calorific value due to moisture absorption of quicklime during storage. When the content of the drug in the smoker is increased, there is a problem that the volatilization rate of the drug is reduced.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an indirect heating method in which the volatilization rate of a drug is not reduced even in a fumigant containing a drug in a high concentration, and the drug is concentrated in the air at a high concentration. It is an object of the present invention to provide a fumigant composition and a fumigation method that can be transpired. It is another object of the present invention to provide a fumigation method that does not cause danger to human body or fire due to smoking.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventors have solved the drawbacks in the prior art, found an excellent fumigant composition and a fumigating method, and reached the present invention. That is, the object of the present invention is achieved by the following fumigant composition. (1) In order to fumigate the fumigating agent, an organic foaming agent is mixed with the fumigating agent as a transpiration aid, and the mixture is indirectly heated for use in the fumigant composition. A fumigant composition characterized by mixing cellulose. (2) The fumigant composition according to (1), wherein the organic blowing agent is azodicarbonamide. (3) The fumigant composition according to (1) or (2), wherein the fumigating agent is permethrin. (4) A fumigating method, wherein the fumigant composition according to any one of (1) to (3) is indirectly heated by the heat of reaction between calcium oxide and water. In the following, a fumigant, an anti-transpiration agent, and a combination of other auxiliaries are referred to as a fumigant or a fumigant composition, and those formed into granules are referred to as granules, for indirect heating. Is used as a heating agent, but the above-mentioned molded product is not limited to the form of granules.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to volatilize the fumigating agent of the present invention, indirect heating methods for fumigating the fumigant include, as described above, a water heating type, an air oxidation heating type, and a heat generation by energization. Among them, the hydrothermal type is preferable because there is no danger to the human body or danger of fire due to smoking. In granules, as a transpiration aid, one of its components,
When only nitrocellulose is used and the content of nitrocellulose in the fumigant is 以上 or more as in JP-A-3-41881, the concentration of nitrocellulose in the fumigant becomes too high and the fumigant is heated. At that time, nitrocellulose may be rapidly decomposed and ignite. Further, the fumigant having such a high nitrocellulose concentration may spontaneously ignite even during storage. Therefore, when nitrocellulose is used as the evaporation aid, the above-mentioned JP-B-63-4188 is used.
As described in Japanese Patent Publication No. 1 (1993), the concentration of nitrocellulose in the fumigant must be reduced by adding, for example, an inorganic powder and a saccharide as a buffering agent, and it must be adjusted so that it is used at most 40%.

The present inventors have conducted intensive studies to develop an excellent transpiration aid. As a result, the transpiration aid consisting of both an organic foaming agent and nitrocellulose is nitrocellulose because the organic foaming agent acts as a buffer. In addition to the fact that spontaneous ignition does not occur and that the interaction between the organic blowing agent and nitrocellulose causes a low heating temperature (for example, in the case of a heating method using the heat of reaction between quicklime and water, when the reaction heat decreases due to the absorption of quicklime) As described above, it has been found that the volatilization rate of the active ingredient (drug) does not decrease even in the case of), and a vaporization aid showing excellent performance has been developed.

As the drug (active ingredient) to be contained in the fumigant composition of the present invention, various drugs such as insecticides, fungicides and repellents which have been conventionally used can be used. The following can be illustrated as typical drugs (active ingredients). (1) Pyrethroid insecticides-3-allyl-2-methylcyclopent-2-ene-4
-On-1-yl dl-cis / trans-chrysanthemate (generic name: Aresulin: trade name Pinamine: manufactured by Sumitomo Chemical Co., Ltd.) 3-Allyl-2-methylcyclopenta-2-ene-4
-On-1-yl d-cis / trans-chrysanthemate (trade name: Pinamine Forte: manufactured by Sumitomo Chemical Co., Ltd.) d-3-allyl-2-methylcyclopenta-2-en-4-one- 1-yl d-trans-chrysanthemate (trade name: Exulin: manufactured by Sumitomo Chemical Co., Ltd.) 3-Allyl-2-methylcyclopent-2-ene-4
-On-1-yl d-trans-chrysanthemate (general name: bioaresulin) -N- (3,4,5,6-tetrahydrophthalimide)-
Methyl dl-cis / trans-chrysanthemate (generic name: phthalsulin: trade name neopinamine: manufactured by Sumitomo Chemical Co., Ltd.)

5-benzyl-3-furylmethyl d-
Cis / trans-chrysanthemate (generic name resmethrin: trade name chryslonforte: manufactured by Sumitomo Chemical Co., Ltd.) 5- (2-propargyl) -3-furylmethyl chrysanthemate (generic name flametrin) 3-phenoxy Benzyl 2,2-dimethyl-3-
(2 ′, 2′-dichloro) vinylcyclopropane carboxylate (generic name: permethrin: trade name: Exmin: manufactured by Sumitomo Chemical Co., Ltd.) 3-phenoxybenzyl d-cis / trans-chrysanthemate (generic name: phenothrin: commercial product (Smithrin: manufactured by Sumitomo Chemical Co., Ltd.) ・ α-cyanophenoxybenzyl isopropyl-4-
Chlorophenyl acetate (generic name fenvalerate:
Product name Sumi Saijin, manufactured by Sumitomo Chemical Co., Ltd.)

D-2-methyl-4-oxo-3-propargylcyclopent-2-enyl d-cis / trans-chrysanthemate (general name: d, d-T80-praletrin: trade name: ETOK, Sumitomo Chemical Co., Ltd.)・ 2,3,5,6-tetrafluoro-4-methylbenzyl-3- (2′-chloro-3 ′, 3 ′, 3′-trifluoro-1-propenyl) -2,2- Dimethylcyclopropanecarboxylate (generic name tefluthrin) 2,3,5,6-tetrafluorobenzyl-3-
(2,2-dichlorovinyl) -2,2-ditylcyclopropanecarboxylate (generic name benfluthrin) (S) -α-cyano-3-phenoxybenzyl (1
R, cis) -3- (2,2-Dichlorovinyl) -2,2
-Dimethylcyclopropanecarboxylate (R, S) -α-cyano-3-phenoxybenzyl
(1R, 1S) -cis / trans-3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate α-cyano-3-phenoxybenzyl d-cis / trans-chrysanthemate 1 -Ethynyl-2-methyl-2-pentenyl cis /
Trans-chrysanthemate 1-ethynyl-2-methyl-2-pentenyl 2,2
-Dimethyl-3- (2-methyl-1-propenyl) cyclopropane-1-carboxylate 1-ethynyl-2-methyl-2-pentenyl 2,
2,3,3-tetramethylcyclopropanecarboxylate 1-ethynyl-2-methyl-2-pentenyl 2,2
-Dimethyl-3- (2,2-dichlorovinyl) cyclopropane-1-carboxylate

(2) Organophosphorus insecticide O, O-dimethyl O- (2,2-dichloro) vinyl phosphate O-isopropoxyphenyl methyl carbamate O, O-dimethyl O- (3-methyl-4 -Nitrophenyl) thionophosphate O, O-diethyl O-2-isopropyl-4-methyl-pyrimidyl- (6) -thiophosphate O, O-dimethyl S- (1,2-dicarbethoxyethyl) -Dithiophosphate The above compounds include isomers thereof.

(3) Carbamate insecticides, such as propoculus, carbaryl, benfracarb, alanicarb, and phenoxycarb. (4) insect growth regulators methoprene, hydroprene, pyriproxyfen, and phenoxycarb. (5) Chitin synthesis inhibitory insect growth regulator diflubenzuron, triflumuron, teflubenzuron, chlorfluazuron, flufenoxuron, hexafluron, cyromazine (6) other insecticides hydramethylnon, imidaclobride, admayer,
Abamectin, boric acid, sulfluramide, pyrazole compounds.

In the granules of the present invention, as long as the fumigation of the drug (active ingredient) is not hindered, various additives such as a potency enhancer, a volatility improver, a deodorant, a deodorant, a fragrance and the like which are usually used are added. An agent can be optionally added. Examples of the potency enhancer include piperonyl butoxide, N-propylisosome, MGK-propylisosome, MGK-264,
Sinepirin 222, Sinepiline 500, Risen 3
84, IBTA, S-421 and the like. Examples of the volatilization rate improver include phenethyl isothiocyanate and dimethyl hymixate.

Examples of the deodorant and deodorant include lauric methacrylate, geranyl crotonate, myristic acetophenone, anisic aldehyde, diphenyl oxide, methyl benzoate, ethyl benzoate, ethyl phenylacetate, safrole, sedawood oil, and seda rapeseed oil. , Citronella oil, petei grain oil, lemongrass oil, etc. Flavors include animal flavors such as Jakka, Reikoneko and Ryunobu; Avies oil, Ajokun oil, almond oil, pepper oil,
In addition to natural flavors including vegetable flavors such as orange oil and sage oil, artificial flavors that are synthetic or extracted flavors are also used.
Only one kind of fragrance may be used, or two or more kinds of fragrance may be mixed. The granules of the present invention may be used in combination with the above-mentioned stabilizers. Such stabilizers include:
Examples of various stabilizers that have been conventionally used for heating and evaporating chemicals can be given.

In the present invention, the organic foaming agent used in combination with the above-mentioned drug and nitrocellulose includes:
Any of various ordinary organic foaming agents that mainly generate nitrogen gas can be used, but those having a foaming temperature of 300 ° C. or less are preferable. Typical organic foaming agents include
Azodicarbonamide (AC), p-benzenesulfonyl hydrazide (TSH), p-toluenesulfonyl hydrazide (THS), p, p'-oxybis (benzenesulfonyl hydrazide) (OSH), dinitrosopentamethylenetetramine (DPT), N , N'-dinitroso N, N'-dimethylterephthalamide (DDTP), trihydrazinotriazine (THT), azobisisobutyronitrile (AIBN), 4,4'-azobiscyanovaleric acid (ACVA), t-butylazoformamide (BAFA), 2,4-bis- (azosulfonyl) toluene (2,4-TSH), 2,4-bis- (azosulfone) toluene (2,4TSH), 2,2′-azo Bisisobutyramide (AZ-A), methyl-2,
Examples thereof include 2′-azobisisobutyrate (AZ-B), 2- (carbamoylazo) isobutyronitrile, and 1,1′-azobiscyclohexanecarbonitrile (ACHC).

The above-mentioned organic blowing agents are usually added to these, for example, "Dyphos" (manufactured by National Reed), "Tribase" (manufactured by National Reed), "OF-14" (manufactured by Adeka-Gas), "O
F-15 "(manufactured by Adeka Gas)," KV-68A "
-1 "(manufactured by Kyodo Yakuhin)," Mark-553 "(manufactured by Adeka Chemi)," Sicostab 60 "and" Sicostab 61 "(G. Sieg
le & Co. ), Cd-stearate, C
a- stearate, Zn- stearate, Zn- octoate, ZnO, Sn- malate, Zn-CO _3, urea,
It is possible to lower the foaming temperature by using additives such as chrome yellow and carbon black.

In the present invention, a transpiration aid comprising a mixture of the above agent and the organic blowing agent with nitrocellulose,
Further, various additives may be mixed as needed to obtain granules.
The mixing ratio of the foaming agent to the drug in the granule component can be appropriately selected according to the type of the exothermic agent and the desired insecticidal effect described below, but the transpiration aid is usually at least about equal to or more than the drug in general. Is good. As the mixing ratio of the transpiration aid increases, the effective volatilization rate of the pesticide gradually increases, but the effect does not improve even if it is too large. Usually, the amount of the transpiration aid is 1/2 to 30 times by weight, preferably 1 to 20 times by weight of the drug. Further, the ratio of the organic foaming agent to nitrocellulose in the evaporation aid is preferably about 1: 1 to 1: 0.2. The transpiration aid has no adverse effect on the insecticide. The granules are prepared by simply mixing the drug and the transpiration aid (if necessary, other additives). However, considering the workability and the simplicity of the production and use of the obtained pesticide, an appropriate granule is prepared. It is preferable to form a block, a pellet, a paste, or the like, or to be sealed in a heat-fusible resin bag or the like, and various binders, solvents, and the like can be used according to the respective usage forms.

In the present invention, examples of the exothermic substance of the exothermic agent include substances that exothermicly react only by adding water, such as calcium oxide, magnesium chloride, aluminum chloride, calcium chloride, and iron chloride. Using this exothermic substance as a heat source, indirectly heating a mixture of various forms obtained by mixing the above-mentioned chemicals and a transpiration aid, and further, if necessary, an appropriate additive, without burning the mixture, The transpiration aid is thermally decomposed. However, exothermic substances other than calcium oxide, which generate heat upon contact with water, have disadvantages in handling, such as the exothermic temperature not being able to reach the above-mentioned temperature, and the use of calcium oxide because it is difficult to use in the present invention. It is desirable to do.

The calcium oxide preferably used in the present invention has a particle size of 1 to 20 mesh. The calcium oxide and its particle size are selected in that they can provide a temperature at which the transpiration aid in the granules can be pyrolyzed and the drug fumigated by simply contacting it with water.
Calcium oxide in the above particle size range can usually generate a temperature of about 150 ° C. to 250 ° C. by contacting it with water. On the other hand, when the particle size is out of the above range, the heat generation temperature becomes too low, and the desired effect cannot be obtained. The temperature of the exothermic agent varies depending on the amount of water to be brought into contact with the exothermic agent. However, the amount of water is usually preferably about 0.2 to 3 mol based on calcium oxide. In order to adjust the calorific value of the calcium oxide, a clay mineral such as diatomaceous earth, acid clay, and zeolite can be further added to calcium oxide to provide a heating agent.

FIG. 1 shows the basic structure of a hydrothermal type fumigant, and the evaporating mechanism will be described with reference to FIG. That is, the fumigant is in the form of a granule 1, and the heating means for heating the fumigant is composed of a heating agent 2 and water 4. A fumigating apparatus is constituted by putting the inner can 3 inside, and putting the outer can 5 provided with the water absorbing plate 6 on the bottom plate having a hole into the outer container 7.
The granule 1 is accommodated in the inner can 3, and the inner can 3 and the outer can 5
And the exothermic agent 2 is contained. The top seal 9 of the outer can 5 is removed and water is poured between the outer container 7 and the outer can 5 or water is poured into the outer container 7 with the outer can 5 or the like taken out. After pouring, the outer can 5 or the like is put in the container and immersed in water. When the outer can 5 is filled with the exothermic agent 2 (calcium oxide), the water 4 passes through the water absorption plate 6 through the hole of the bottom plate of the outer can 5. The water 4 permeates into the inside and reacts with the exothermic agent 2 (calcium oxide). This reaction is extremely fast, and the temperature in the outer can 5 reaches about 300 ° C. after several tens of seconds. This heat is transmitted to the granule 1 through the wall of the metal inner can 3. The granules 1 to which heat is applied are foamed and melted, and the active ingredient is finely sprayed as fine particles of several microns. What is important here is that the granule 1 and the exothermic agent 3 are stored separately and that the granule 1 mainly contains a foaming component (organic foaming agent and nitrocellulose) with a granular active ingredient. It has been formulated.

[0023]

The present invention will be specifically described below with reference to examples. However, the present invention is not limited to only this embodiment. a. Test of fumigant to be tested A fever-controlling fumigant of pest control type was prepared by storing the granules and the exothermic agent separately. It consists of permethrin as an active ingredient (drug) and azodicarbonamide as an organic foaming agent. The exothermic agent is 76 g of quicklime (20.6 kca).
Use l). The permethrin content was increased in this fumigant, and the volatilization rate of permethrin was measured. The results are shown in Table 1. As shown in Table 1, it was confirmed that as the content of permethrin was increased, the volatility of permethrin was reduced.

[0024]

[Table 1]

(Example 1) For the test granules having a permethrin content of 20% shown in Table 1, the volatilization rate of permethrin by adding nitrocellulose was measured. The results are shown in Table 2. As shown in Table 2, it was confirmed that the addition of nitrocellulose increased the volatility of permethrin.

[0026]

[Table 2]

Example 2 The volatilization rate of permethrin when quicklime deteriorated due to moisture absorption or the like was measured. In a hydrothermal type fumigant in which a granule and a heating agent are stored separately, the granule is composed of 10% permethrin as a fumigating agent, azodicarbonamide as an organic foaming agent, and 65 g of quicklime. (17.6 kcal). In this fumigant, the volatilization rate of permethrin when quick lime was degraded by absorbing quick lime was measured.
The results are shown in Table 3. As shown in Table 3, it was confirmed that the addition of nitrocellulose can suppress a decrease in the volatilization rate of permethrin when quicklime deteriorates due to moisture absorption.

[0028]

[Table 3]

[0029]

According to the present invention, it is possible to provide a fumigant capable of fumigation with a high drug concentration without a decrease in the volatilization rate of the drug even if the content of the drug in the fumigant granule is increased. Further, even if quicklime in the burning agent of the fumigant deteriorates due to moisture absorption or the like, a decrease in the volatilization rate of the drug can be suppressed, and a deterioration in the quality of the fumigant can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partially sectional explanatory view showing a typical packaging example of a fumigant of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granule 2 Heating agent 3 Inner can 4 Water 5 Outer can 6 Water absorption plate 7 Outer container 8 Lid 9 Top seal

Claims (4)

[Claims] 1. A fumigant composition for fumigating a fumigant, wherein an organic foaming agent is mixed with the fumigant as a transpiration aid, and the mixture is indirectly heated for use. A fumigant composition characterized by mixing nitrocellulose with the composition. 2. The fumigant composition according to claim 1, wherein the organic blowing agent is azodicarbonamide. 3. The fumigant composition according to claim 1, wherein the fumigating agent is permethrin. 4. A method for fumigation, comprising heating the fumigant composition according to claim 1 indirectly by the heat of reaction between calcium oxide and water.