JPS58135801A - Insecticidal fumigant - Google Patents

Abstract

PURPOSE:To provide an insecticidal fumigant composed of a container sealed at its top with a double wall sheet consisting of a metallic foil having a number of perforations and a releasing paper, a sealed plastic film bag containing a mixture of an insecticidal component and an organic foaming agent and contained in the container, a heat-generating means placed in contact with the plastic film bag, and terminals to connect said heat-generating means with an external cell. CONSTITUTION:The plastic container B is sealed with a double wall sheet C composed of a metallic foil 3 such as Al having a number of holes 4 for fumigation and a releasing paper 5 covering the whole surface of the foil 3. The container B contains a sealed plastic film bag A containing a mixture 2 of a pyrethroidal insecticidal component and an organic foaming component (e.g. azodicarbonamide) and a nichrome wire N placed in contact with said bag A and a capable of generating heat when connected with a cell. The insecticidal fumigating body obtained by filling an insecticidal component in a plastic film bag and contacting the bag with a nichrome wire can be stored for a long period, and fumigation is performed easily by using a conventional 1.5V cell. The amount of fume can be controlled by adjusting the area of the peeled releasing paper.

Description

[Detailed description of the invention] The present invention relates to a smoked insecticide.

There are three types of smoke insecticides currently available on the market. One type of insecticidal ingredient is a chemical that generates heat when it chemically reacts with a combustible substance, such as nitrates, chromates, perchlorates, etc., and when used, it starts smoking in a part of the container. is inserted, ignited with a matchstick, etc., and the heat generated by the smoke starts smoking the insecticidal composition at a high temperature of 400°C or more.
It volatilizes insecticidal ingredients with heat of C or higher.

The second method involves adding water to quicklime to generate heat from an insecticidal composition consisting of an insecticidal component and an organic foaming agent, thereby causing thermal decomposition of the organic foaming agent and smoking.

The third method uses the heat generated during air oxidation of alkali metal sulfides to smoke pesticide components.

Among the above methods, the first method uses fire, which is dangerous, and the contents reach a high temperature of over 400°C, which has a large impact on surrounding objects. The agent generates a lot of smoke and has a characteristic odor due to the heat generated during the chemical reaction, making it undesirable for use in areas where people are constantly coming and going, such as homes and cafeterias.

In addition, the third method is to volatilize insecticidal ingredients using the heat generated during air oxidation of alkali metal sulfides, which allows smoking by simply cutting the seal, and is easy to use, but air oxidation In order to utilize the heat generated, an airtight container is required that does not come in contact with air until it is used, and even with this method, a high temperature of 300°C or higher is required to smoke the insecticidal ingredients. In order to eliminate the disturbance caused by this temperature, further ingenuity is required in the container, which has the disadvantage of being expensive.

The second insecticidal composition consisting of an insecticidal ingredient and an organic blowing agent smokes the insecticidal ingredient using the heat and gas generated during thermal decomposition of the organic foaming agent. Because quicklime is obtained by reacting with water, it is necessary to put it in a highly moisture-proof aluminum bag to prevent it from completely reacting with moisture in the air before use. Since the insecticidal components decompose on contact, a double-walled container is required, and in addition, the container must be strong enough to withstand the increase in volume caused by the absorption of water by the quicklime.

As mentioned above, after considering various advantages and disadvantages of currently used smoked insecticides and continuing research, we have developed this book as a smoked insecticide that smokes an insecticidal composition containing a pyrethroid insecticidal ingredient and an organic foaming agent. invention has been achieved.

That is, a means capable of conducting heat by a battery is provided inside the main body of the container in which the opening on the top surface is sealed with a double sheet made of metal foil such as Aluminum X foil with many holes distributed over it and covered with release paper. This smoked insecticide is made by bringing a plastic film bag sealed with a mixture of a pyrethroid insecticidal component and an organic foaming agent into contact with the heating means.

One particularly useful finding in the present invention is that a smoke composition consisting of a pyrethroid insecticidal ingredient, which is an insecticidal ingredient particularly effective against cockroaches, and an organic foaming agent, is filled into a plastic film bag and sealed. The method of smoking the nichrome wire by energizing it and generating heat is already known; In long-term tests, it was found that nichrome wire was affected by oxidative corrosion due to the smoke composition, and did not generate heat or smoke even when energized during use.To improve this problem, nichrome wire If the wire were made of platinum wire, it would be too expensive and impractical to be thrown away. The present invention improves these points by avoiding direct contact of the insecticidal composition with the nichrome wire, storing the insecticidal composition in a plastic film bag, and removing the nichrome wire from outside the storage bag. By contacting with the wire, there was no effect on long-term storage, and leakage of the insecticidal composition powder from the container body was also completely prevented.

When the nichrome wire is connected to a normal 1.5V dry cell battery, the heat generated causes thermal decomposition of the organic blowing agent, producing smoke. At that time, even if a plastic film is present between the insecticidal composition and the insecticidal composition, there is no problem with smoking, and no change was observed in impact tests such as long-term storage tests and drop tests, demonstrating the usefulness of the present invention. Corroborated.

Furthermore, according to the present invention, the smoke ejection and force can be adjusted by adjusting the size and number of smoke emitting holes in the upper opening of the container body without opening the entire area. That is, in the upper open part of the container body, a number of appropriately sized holes are distributed in metal foil such as aluminum, and then sealed with a double sheet covered with release paper. It is possible to adjust the force and amount of the peeling plume.

The nichrome wire has an insulated terminal for continuity between it and the battery, and when it is used, just by removing it, the nichrome wire can be easily energized and smoke can be generated, so other methods using pine, water, etc. It can be made extremely simple compared to . Furthermore, the container body does not need to be made of metal such as aluminum or tin; a plastic container is sufficient, and it can be easily molded and produced in large quantities.

The pyrethroids used as insecticidal ingredients in the smoked insecticide used in the present invention include pyrethrin, allethrin, resmethrin, flamethrin, phenothrin, verme, tri/
, fenvalerate, etc. These pyrethroids exist in various isomers, all of which can be used in the present invention.

As the organic blowing agent, azodicardenamide, 4.4'-
Those that mainly generate nitrogen gas by thermal decomposition, such as oxybis(benzenesulfonyl hydrazide), dinitrosopentamethylenetetramine, and 2,2'-azobisisobutyronitrile, can be used. Preferably, the above compounds have a decomposition temperature of 2500C or less. These can be used alone, or it is also possible to combine those with a high decomposition temperature and those with a low decomposition temperature to cause decomposition at a low temperature. Furthermore, additives commonly used in these organic blowing agents, such as potassium nitrate, ammonium salts, cyanamide, urea, melamine, guanidine nitrate, or dicyandiamide, can be added to lower the decomposition temperature and suppress the generation of flames. .

The insecticidal composition used in the present invention can be easily prepared by directly mixing or impregnating an insecticidal component into an organic foaming agent, and can also be made into granules by adding excipients as necessary. It is.

As the material for the plastic film bag filled with the smoke composition, polyethylene, polypropylene, nylon, polyester, etc. can be used. The thickness is preferably about 1 to 10 microns because smoking can be carried out efficiently and it is necessary to withstand impact during storage.

Further, polyethylene or other plastic films are usually used as a laminate, but a laminate film of cellophane and polyethylene could also be used in the present invention.

Next, an example will be shown in which a plastic film bag was filled with the insecticidal composition used in the present invention. All parts in the following examples indicate parts by weight.

Example 1 15 parts of permethrin was impregnated with 85 parts of azodicarbonamide, and the powder obtained by uniformly mixing was filled into a laminate film bag having a thickness of 20p polyethylene and 20μ polypropylene.

Example 2 A powder obtained by impregnating and uniformly mixing permethrin in a mixture of 70 parts of 4,4'-oxybis(benzenesulfonyl hydrazide), 9 parts of guanidine nitrate, and 1 part of potassium nitrate was added to polyethylene and then added to polyethylene. It was filled into a μ laminated film bag.

Example 3 Varnish bioallethrin (Subiol, trade name) Kabe,
Impregnate the white carbon part and add 2,2
Add 55 parts of '-azobisisobutyronitrile and 5 parts of CMo, mix uniformly, and use a conventional method to form a powder with a diameter of about 1 cm and a length of 2 cm.
The pellets were made into granules of ~4 sm, and filled into a bag made of 30'O laminate film made of polyethylene and cellonone.

Example 4 Phenothrin-added part Total 4.4'-Oxybis(benzenesulfonyl hydrazide) 65 parts, guanidine nitrate 13 parts, and potassium nitrate 2 parts were impregnated with a mixture of 2 parts of potassium nitrate, and the obtained powder was mixed uniformly with polyethylene. It was filled into a nylon Iμ laminated film bag.

Example 5 A powder obtained by impregnating and uniformly mixing 10 parts of fenvalerate in a mixture of 10 parts of clay and 80 parts of tocinitrosobentamethylenetetramine was filled into a bag made of a laminate film of 10μ polyethylene and 10P polyester.

Next, the test results of the smoked insecticide of the present invention will be shown.

Test Results 1 The fillings of Examples 1, 2, 3, 4, and 5 were brought into contact with a nichrome wire capable of conduction and heat generation using a battery having an insulated terminal, and were built into a container body, and a double sheet was placed on the top surface of the container body according to the present invention. The structure of the smoke insecticidal body is as follows.

FIG. 1 is a cross-sectional explanatory diagram showing an example of the structure of the smoked insecticide of the present invention, in which A is a bag made of plastic film 1, 2 is a filling mixture of an insecticidal component and a foaming agent, and B is a bag made of plastic film 1; The main body of the container is made of plastic, and a hole 4 for smoke is provided in aluminum foil 3 in the open upper part, and the container is sealed with a double sheet C that completely covers the release paper and .5. N is a nichrome wire, and D is a conducting wire, which is connected to a battery and has an insulated terminal provided in the middle (not shown).

Further, FIG. 2 shows an example in which the insecticide-containing bag A is divided and placed above and below the nichrome wire N, respectively.

Figure 3 shows a part of the release paper 5 of the double sheet C that seals the upper open part of the container body B is peeled off, and the plume holes 4 provided in the aluminum foil 3 below adjust the force and amount of the plume. FIG.

The method of setting the bag A containing the smoked insecticidal composition in contact with the nichrome wire N in the container body B can be any method other than placing the nichrome wire N in the middle of the folded bag as shown in Figure 1. be able to.

The above-mentioned smoking insecticide was placed in a 6-tatami model room, the insulated terminal was pulled out, and current was passed from the battery to the nichrome wire to start smoking, and the amount of insecticidal component volatilized into the air was spread over a fixed area of the floor. It was measured by the amount of sediment. At the same time, the insecticidal effect on adult German cockroaches was tested. In addition, commercially available product (d-Lumethrin 5
The test was conducted using a sample (containing water) as a control. The results were as shown in the table below.

(However, the contact time with the drug is 15 hours.) The amount of active ingredients used in the above smoke insecticides is 1.5 f per 6 tatami mats.
It is. As a result, it is clear that the insecticide of the present invention has a superior volatilization rate of the insecticidal component compared to commercially available products, and is also found to have a high insecticidal effect.

[Brief explanation of drawings]

1 and 2 are cross-sectional explanatory views showing one example of the smoked insecticide of the present invention, and FIG. 3 is an explanatory view showing a state in which the release paper is partially peeled off for use. A: Bag containing insecticide B: Container body C: Double sheet D: Conductor N: Nichrome wire 1...Plastic film 2...
... Insecticidal composition 3 ... Aluminum foil 4 ... Smoke holes 5 ... Release paper Patent applicant Dainippon Jomugiku Co., Ltd. Company: Toppan Printing Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] The opening on the top surface is covered with a double sheet made of aluminum foil with many holes distributed over it and a release paper. Inside the sealed container body, a means for conduction and heat generation by a battery is installed, and a pyrethroid insecticidal ingredient and an organic A smoking insecticide comprising a plastic film bag filled with a mixture with a foaming agent and sealed so as to be in contact with the heating means.