JPS629081B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for repelling pests by fumigating a repellent, and more specifically, a method for fumigating a repellent intensively in a short period of time to prevent rodents, such as rats, in rooms, food factories, and other confined spaces. This invention relates to a method for repelling sanitary pests such as mosquitoes, flies, cockroaches, etc. Conventionally, a method for repelling rodents and pests by fumigating a repellent in a short period of time is to mix the repellent with a combustion agent and release the chemical using the combustion heat and smoke of the combustion agent. However, this method has the following drawbacks. In other words, in order to quickly evaporate a large amount of repellent, it is essential to burn a combustion agent that produces highly toxic smoke. etc. and the risk of fire. More importantly, with the above-mentioned smoke agent, thermal decomposition of the repellent due to combustion heat, resulting in a decrease in effective volatilization rate, that is, a decrease in repellent efficiency, and economic loss are unavoidable. The present invention provides an alternative to the method of repelling rodents and insect pests using the above-mentioned known smoke agent, which allows a large amount of repellent to be instantaneously and effectively evaporated over a wide area.
Moreover, the present invention provides a new method for repelling rodents and pests that does not substantially generate smoke and therefore does not cause problems such as toxicity or irritating odor, and is free from the risk of fire. That is, the present invention uses an organic foaming agent that thermally decomposes the repellent at a temperature of 300°C or less to generate mainly nitrogen gas and carbon dioxide gas when fumigating the repellent to repel rodents and pests. a rodent and a rodent, characterized in that the organic blowing agent is thermally decomposed without combustion by indirectly heating the mixture, and the repellent is effectively fumigated by the action of the thermally decomposed gas; Pertains to pest avoidance methods. As the repellent in the present invention, any of the various drugs conventionally used as repellents for rodents and pests can be used. The following are examples of representative drugs. Pest repellent Γ Dimethyl phthalate Γ 2,3,4,5-bis-(△ ₂ -butylene)-
Tetrahydrofuran Γ 2,3,4,5-bis-(△ ₂ -butylene)-
Tetrahydrofurfuryl alcohol Γ N,N-diethyl-m-toluamide (hereinafter
DET) Γ Caprylic acid diethylamide Γ 2,3,4,5-bis-(△ ₂ -butylene)-
Tetrahydrofurfural Γ Di-n-propyl-isocincomeronate (hereinafter referred to as DPIC) Γ Secondary butylstyryl ketone Γ Nonyl styryl ketone Γ N-propylacetanilide Γ 2-ethyl-1,3-hexanediol Γ Succinct Acid ester {e.g. dibutyl succinate, di-n-butyl succinate (hereinafter referred to as DNBS)
)} Γ Methoxymethyl Γ 2-Butoxyethyl-2-furfridene acetate Γ Dibutyl phthalate Γ Tetrahydrothiophene Γ βnaphthol Γ Diallyl disulfide Γ Bis(dimethylthiocarbamoyl) disulfide rodent repellent Γ Tetramethyl Thiuram disulfite Γ Guanidine Γ Naphthalene Γ Tetramethylthiuram disulfite Γ Cresol Γ Cycloheximide Γ Diink dimethyl dithiocarbamate cyclohexylamine Γ NN-dimethylsulfenyl dithiocarbamate The above-mentioned repellent in the present invention includes commonly used repellents. Various additives such as volatilization rate improvers, deodorants, fragrances, etc. can be optionally added. Examples of the volatilization rate improver include phenethyl isothiocyanate, dimethyl himixate, etc., deodorants include lauric acid methacrylate (LMA), and fragrances include citral, citronellal, etc. In addition, in the present invention, as the organic blowing agent used in combination with the above-mentioned repellent and various additives added as necessary, those that are thermally decomposed at a temperature of 300°C or less and mainly generate nitrogen gas and carbon dioxide gas are used. .
Representative organic blowing agents are illustrated in Table 1 below.

[Table] The above organic blowing agents are commonly added to, for example, "Dyphos" (manufactured by National Lead Co., Ltd.),
“Tribase” (manufactured by National Reed), “OF
-14” (manufactured by Adeka Argus), “OF-15” (manufactured by Adeka Argus), “KV-68A-1” (manufactured by Kyodo Yakuhin), “Mark-553” (manufactured by Adeka Chemi), “Sicostab60” ” and “Sicostab61” (manufactured by G.Siegle & Co.), Cd-stearate, Ca-stearate, Zn-stearate, Zn-octate, ZnO, Sn-malate, etc.
It is possible to lower the decomposition temperature by using additives such as ZnCO ₃ , urea, chrome yellow, and carbon black. In the present invention, the mixing ratio of the organic blowing agent to the repellent can be appropriately selected depending on the desired repellent effect of the obtained repellent, etc., but the organic blowing agent is usually mixed at least about 1/2 times the weight of the repellent. It is better to do so. As the mixing ratio of the organic blowing agent increases, the effective volatilization rate of the repellent gradually improves, but if the amount increases too much, the effect does not improve. The amount of the organic blowing agent is preferably about 1/2 to 30 times the weight of the repellent, preferably about 1 to 20 times the weight of the repellent. The mixing form of the above repellent and organic foaming agent is not particularly limited, but in consideration of workability and ease of production and use of the resulting repellent, suitable granular, lump, pellet, paste, or matte forms may be used. It is preferable to mix and encapsulate them in a hot-melt resin bag or the like, and various binders, solvents, etc. can be used depending on the usage form. In the present invention, mixtures of various forms made by mixing the repellent and the organic blowing agent, as well as appropriate additives as necessary, are heated indirectly, and the organic blowing agent in the mixture is heated without burning the 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 organic blowing agent in the mixture can be decomposed without burning the mixture. Specifically, the following heat sources can be advantageously used. 1. Compounds that generate heat upon hydration reaction Examples include substances that generate heat when water is added, such as magnesium chloride, aluminum chloride, calcium chloride, and iron chloride. 2. Electric heat source that generates heat when energized For example, a heating wire such as a nichrome wire, a sheet heater, a heater using a semiconductor, etc. can be used. 3. Heat sources using fire Examples include alcohol lamps, candles, gas burners, charcoal fires, kerosene, portable solid fuels, gelled alcohol, and gelled kerosene. 4 Combinations of metals or metal compounds that generate heat through oxidation reactions and auxiliary agents, etc., such as mixing iron powder and oxidizing agents (ammonium chlorate, etc.), metals and metal oxides or oxides that have a smaller ionization tendency than the metals. A method in which a mixture of iron and at least one of potassium sulfate, iron sulfide, metal chloride, iron sulfate, etc. is brought into contact with water and oxygen, a method in which a mixture of iron and at least one of potassium sulfate, iron sulfide, metal chloride, iron sulfate, etc. Examples include a method in which a mixture of a small metal with a halide is brought into contact with water, a method in which a mixture of a metal and a bisulfate is brought into contact with water, and a method in which water is added to a mixture of aluminum and an alkali metal nitrate. 5. A method that utilizes the oxidation reaction of metal sulfide, for example, a method in which a mixture of soda sulfide and at least one selected from iron carbide and carbon black is brought into contact with oxygen. In the present invention, the various heat sources described above generate heat by energizing, mixing, or contacting with water and/or air, and the mixture of the repellent and organic blowing agent is indirectly heated using the amount of heat. Indirect heating is carried out, for example, by placing a mixture containing the repellent and organic blowing agent 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 heat source is housed in a sealed outer container, and the inner container containing the mixture containing the repellent and the organic foaming agent is placed in the outer container so that the bottom wall and side wall of the inner container are sealed. It is preferable to store at least a portion of it as a partition wall. When the mixture is indirectly heated by the heat generated by the heat source, the mixture is heated without causing any ignition and combustion, and the organic blowing agent in the mixture undergoes a thermal decomposition reaction. In the method of the present invention, the repellent in the mixture is forcibly released by the gas generated by the thermal decomposition reaction of the organic blowing agent, and its volatilization is accelerated, and furthermore, the repellent is not exposed to high temperatures where thermal decomposition and denaturation occur. evaporates rapidly and effectively in an extremely short period of time.
That is, the thermal decomposition of the organic blowing agent occurs all at once when the entire mixture is uniformly heated by a heat source, so a large amount of gas is instantly and explosively generated from the entire mixture, and as a result, the repellent in the mixture is The gas is effectively diffused throughout the processing space, and a high repellent effect can be achieved. Therefore, the method of the present invention can extremely effectively repel sanitary pests such as rodents such as rats, mosquitoes, flies, bed bugs, dust mites, and cockroaches that live in rooms, food factories, and other confined spaces. can. Moreover, unlike conventional methods, the method of the present invention does not utilize combustion of a combustible agent, and has the advantage that it can be carried out safely and easily without substantially causing the generation of irritating odors, smoke, etc., or the risk of fire. Examples will be given below to explain the present invention in more detail. In addition, the effective volatilization rate of the repellent in the examples is determined by fumigating the repellent in a closed container, passing the air inside the container into benzene, collecting the repellent in the air in benzene, concentrating it, and then using a gas chromatograph. E and expressed as a percentage of the initial repellent weight. Example 1 Each repellent and organic foaming agent listed in Table 2 below were mixed and stored in a suitable cylindrical container, and the container was heated externally with an electric heat source (maximum temperature 300°C) to form an organic foam inside the container. The repellent is thermally decomposed and the repellent is volatilized. The results of measuring the effective volatilization rate of the repellent at that time are shown in Table 2 below.

【table】

[Table] Comparative Example 1 The repellent was volatilized in the same manner as in Example 1 except that the organic blowing agent was not used. The results are shown in Part 3 below.
Shown in the table.

[Test method]

15 g of solid feed (manufactured by Oriental Yeast Co., Ltd. for mouse rats) was sealed in a 5 x 8 cm (surface area 80 cm ² ) paper bag, and one of the paper bags containing the feed was placed directly into the bag.
Another ^30cm3 experiment box (5 x 5
They were placed on the floor of a room measuring 3.6 x 3.6 x 2.7 m (height). The test feed was then fumigated in the center of the room, and after 15 hours overnight, each paper bag was removed and each was placed in a rat trap containing one black rat (weight 100-150 g), and fumigated every 24 hours. The feeding damage status was observed over 5 days. During the test period, the test animals in the rat trap were given free access to drinking water. The above-mentioned feeding damage observation was carried out by repeating the same test three times for each paper bag (test animal numbers 1 to 3). Furthermore,
The same feeding damage observation test was conducted using a new paper bag containing feed (untreated) that had not been subjected to any treatment (control). The results of the above test are shown in Table 4 below.

【table】

[Table] From Table 4 above, it can be seen that according to the indirect heating method using the organic blowing agent of the present invention, a large amount of gas is generated explosively and instantly from the entire sample, and this causes the repellent to be placed in the experiment box, etc. It is clear that it can be sufficiently diffused, penetrated and dropped even in a narrow space, and thus has a very high repelling effect and can effectively repel rats. On the other hand, in indirect heating of samples using dicyandiamide, the repellent cannot be diffused well because the dicyandiamide itself does not generate enough gas, and as a result, the repellent effect is particularly low in the experimental box. It turns out that it becomes.

Claims (1)

[Claims] 1. When fumigating a repellent to repel rodents and pests, the repellent is thermally decomposed at a temperature below 300°C and mixed with an organic blowing agent that generates mainly nitrogen gas and carbon dioxide gas, and the mixture is A method for repelling rodents and pests, characterized by indirectly heating the organic foaming agent to thermally decompose the organic foaming agent without combustion, and effectively fumigating the repellent by the action of the thermally decomposed gas. .