JPS629082B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides a method for exterminating rodents by fumigating a rodent extermination agent, and more specifically, a method for fumigating a rodent extermination agent intensively in a short period of time,
This invention relates to a method for exterminating rodents in a room or other confined space. Conventionally, a method for exterminating rodents by fumigating a rodent exterminating agent in a short period of time is to mix the agent with a combustion agent and release the agent by the combustion heat and smoke of the combustion agent. A method using a smoking agent is common, but this method has the following drawbacks. That is, in order to quickly evaporate a large amount of rodent exterminating agents, it is essential to burn a combustion agent that generates highly toxic smoke, and therefore, when using this smoke agent, it is necessary to It is accompanied by a pungent odor, danger to the human body, and a risk of fire. More importantly, with the above-mentioned smoke agent, thermal decomposition of the rodent extermination agent due to combustion heat, resulting in a decrease in effective volatilization rate, that is, a decrease in extermination efficiency and economic loss cannot be avoided. The present invention is capable of instantly and effectively transpiring a large amount of a rodent extermination agent over a wide area, in place of the above-mentioned known method for exterminating rodents using a smoke agent, and can substantially reduce smoke generation. To provide a new method for exterminating rodents without causing problems such as toxicity and irritating odor, and without the risk of fire. That is, in the present invention, when fumigating a rodent exterminating agent to exterminate rodents, the rodent exterminating agent is thermally decomposed at a temperature of 300°C or less to produce mainly nitrogen gas and carbon dioxide gas. The mixture is indirectly heated to thermally decompose the organic foaming agent without combustion, and the rodent control agent is effectively fumigated by the action of the pyrolyzed gas. This invention relates to a rodent extermination method characterized by: In the present invention, as the rodent exterminating agent, any of the various agents conventionally used for rodent exterminating agents can be used. Examples of representative drugs include the following. Silyloside, yellow phosphorus, arsenite, thallium sulfate, zinc phosphide, sodium monofluoroacetate, antu, norbomide, warfarin, fumarin, comatetralyl, endoroside, alphanaphthylthiourea, thiosemicarbazide, coumachlor, deifenacum, pival, chlorophacinone , daifacinone, N-3-pyridylmethyl-N'-nitrophenyluria, cophaside (hereinafter referred to as RH-787), silatrene, calciferol. Various commonly used additives such as an attractant, a volatilization rate improver, a deodorant, and a perfume can be optionally added to the above-mentioned drug in the present invention. As a volatilization rate improver, phenethyl isothiocyanate,
Examples of deodorants include dimethyl hemicate, deodorants include lauric acid methacrylate (LMA), and fragrances include citral and citronellal. In addition, in the present invention, the organic foaming agent used in combination with the above-mentioned rodent exterminating agent and various additives added as necessary is one that thermally decomposes at a temperature of 300°C or less and mainly generates nitrogen gas and carbon dioxide gas. Use what you have. Typical organic blowing agents are illustrated in Table 1 below.

【table】

[Test method]

The test pieces were 15 x 25 cm plywood boards, one of which was left as is (open), and the other was placed in a 30 cm ³ experimental box (with a 5 x 5 cm slit opening at the top).
3.6 x 3.6 x
It was installed on the floor of a room with a height of 2.7 m. Next, the test sample was fumigated in the center of the room, and after 15 hours overnight, the test piece was taken out and placed on the bottom of the rat trap.
One animal (100 to 150 g) was released, and the test animals were allowed free access to solid feed and drinking water, and their feed consumption and condition were observed every 24 hours for 10 days. The same test was repeated three times for each specimen (test animal numbers 1-3). As a control test, the same test as above was repeated twice using a new test piece that had not been subjected to any treatment. The above test results are shown in Table 1 below.

[Table] From Table 1 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 explosively and instantaneously generated from the entire sample, and this causes the rodent-killing agent to be released. It is clear that it can sufficiently diffuse, penetrate and fall into narrow spaces such as experiment boxes, and thus can effectively exterminate rats with a very high exterminating effect. In contrast, indirect heating of samples using dicyandiamide does not allow the rodent repellent to diffuse well due to the insufficient amount of gas generated by the dicyandiamide itself, and as a result, it is difficult to diffuse the rodent control agent, especially in the experimental box. It can be seen that the extermination effect becomes low.

[Brief explanation of the drawing]

FIG. 1 shows one specific example of the mode of use of the rodent control agent of the present invention. In the diagram 1
is the outer container, 2 is the inner container, 3 is the water absorption hole, 4 is the drug,
5 is a pyrogen.

Claims (1)

[Claims] 1. When exterminating rodents by fumigating a rodent exterminating agent, the rodent exterminating agent is thermally decomposed at a temperature of 300°C or less to mainly generate nitrogen gas and carbon dioxide gas. pyrolyzing the organic blowing agent without combustion by indirectly heating the mixture, and effectively fumigating the rodenticide by the action of the pyrolysis gas; A rodent extermination method characterized by: