JPH0233681B2 - - Google Patents

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 pine etc., and the heat generated by the smoke starts to smoke the insecticidal composition at a high temperature of 400°C or more, and the insecticidal component is volatilized by the heat of 400°C or more. It is something. The second method is to add 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 degrees Celsius, which has a large impact on surrounding objects, and this type of smoke insecticide generates a lot of smoke,
The odor is also a characteristic odor of the drug due to the heat generated during the chemical reaction, making it undesirable for use in places where people are constantly coming and going, such as ordinary 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 Since the generated heat is used, an airtight container is required that does not come in contact with air until it is used.Furthermore, even with this method, high temperatures of over 300℃ are 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 foaming agent smokes the insecticidal ingredient using the heat and gas generated during thermal decomposition of the organic foaming agent. is obtained by the reaction between quicklime and water, so it is necessary to place the quicklime in a highly moisture-proof aluminum bag to prevent it from completely reacting with moisture in the air before use. Because the insecticidal ingredient decomposes when it comes into contact with the insecticidal ingredient, a double-walled container is required.
The container must also 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. The invention has been achieved. That is, the opening on the top surface is made of a polyethylene laminate plastic film filled with a mixture of a pyrethroid insecticidal component and an organic foaming agent with a decomposition temperature of 250° C. or less and sealed with a large number of holes distributed therein. A container in which a bag is housed in contact with a means capable of conduction and heat generation by a battery, characterized in that the opening on the top surface of the container is sealed with a double sheet made of aluminum foil covered with a large number of holes and covered with a release paper. The point is that it is a smoked insecticide. 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. There is already a known method in which the nichrome wire is brought into contact with the nichrome wire, and the nichrome wire is heated by electricity, but in both cases the nichrome wire and the composition to be smoked are in contact with each other, and they do not last for long periods of time. Tests have shown that nichrome wire is affected by oxidative corrosion due to the smoke composition, and does not generate heat or smoke even when energized during use. If it were made into a wire, it would be too expensive and impractical to throw away. The present invention aims to improve these points by avoiding direct contact of the insecticidal composition with the nichrome wire, filling and storing the insecticidal composition in a plastic film bag, and storing the insecticidal composition outside the storage bag. By contacting with the nichrome 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 the organic blowing agent to thermally decompose, 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, in the present invention, the force of smoke ejection can be adjusted by adjusting the size and number of smoke ejection 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 a double sheet covered with release paper is sealed on top of the hole, and the release paper is peeled off appropriately before use. The force and amount of spray can be adjusted. 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 . Further, 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 pyrethroid used as the insecticidal component of the smoke insecticide used in the present invention includes pyrethrin, allethrin, resmethrin, flamethrin, phenothrin, permethrin, fuenvalerate, etc. These pyrethroids exist in various isomers. can also be used in the present invention. As an organic blowing agent, azodicarbonamide,
4,4'-oxybis(benzenesulfonylhydrazide), dinitrosopentamethylenetetramine,
Those that mainly generate nitrogen gas through thermal decomposition, such as 2,2'-azobisisobutyronitrile, can be used. Preferably, the decomposition temperature of the above compounds is
The temperature below 250℃ is good. 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, urine water, melamine, guanidine nitrate, or dicyandiamide, can be added to lower the decomposition temperature and suppress the generation of flames. can. 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. Polyethylene, polypropylene, nylon, polyester, etc. can be used as the material for the plastic film bag filled with the smoke composition. The thickness should be about 20 to 50 microns to allow efficient smoking and to withstand impact during storage.
Although polyethylene or other plastic films are usually used as a laminate, 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 20 μm of polyethylene and 20 μm of polypropylene. Example 2 A powder obtained by impregnating 20 parts of permethrin in a mixture of 70 parts of 4,4'-oxybis(benzenesulfonyl hydrazide), 9 parts of guanidine nitrate and 1 part of potassium nitrate and uniformly mixing the mixture was made into polyethylene.
It was filled into a laminate film bag of 20μ and polypropylene 20μ. Example 3 20 parts of S-bioallethrin (S-BIOL, trade name) and 20 parts of white carbon were impregnated with 2,2'-azobisisobutyronitrile.
55 parts of CMC and 5 parts of CMC were added and mixed uniformly, and granules having a diameter of about 1 mm and a length of 2 to 4 mm were prepared by a conventional method, and the granules were filled into a laminate film bag made of 20μ polyethylene and No. 300 cellophane. Example 4 20 parts of phenothrin was impregnated with a mixture of 65 parts of 4,4'-oxybis(benzenesulfonyl hydrazide), 13 parts of guanidine nitrate, and 2 parts of potassium nitrate, and the resulting powder was mixed uniformly with polyethylene.
It was filled into a laminate film bag made of 20μ and 30μ nylon. Example 5 A powder obtained by impregnating 10 parts of fenvalerate in a mixture of 10 parts of clay and 80 parts of dinitrosopentamethylenetetramine and mixing uniformly was prepared into polyethylene.
It was filled in a laminate film bag of 10μ and polyester 10μ. 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 that can conduct heat using a battery having an insulated terminal, and were built into a container body, and a double sheet was placed on the top of the container body according to the present invention. The structure of the smoked insecticidal body is as follows. FIG. 1 is a cross-sectional explanatory view showing one 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 insecticidal ingredients 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 covering the entire surface with a release paper 5 on top. 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 open part on the top of the container body B is peeled off, and the holes 4 for plume formed in the aluminum foil 3 below are used to check the force and amount of the plume. It is an explanatory view showing a child to be adjusted. 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 making the nichrome wire N come in the middle of the folded bag as shown in Figure 1. Can be done. The above-mentioned smoking insecticide was removed from the insulated terminal in a 6-tatami model room, and the battery was connected to the nichrome wire to start smoking, and the amount of the insecticidal component volatilized into the air was deposited on a certain area of the floor. Measured by volume. At the same time, the insecticidal effect on adult German cockroaches was tested.
The test was conducted using a commercially available product (containing 5% permethrin) as a control. The results were as shown in the table below.

[Comparative test 1]

According to Example 2, the type of organic blowing agent, the material and thickness of the plastic film were changed, and the smoked insecticides were prepared with the following composition using the battery smoking method used in the present invention or the conventional method of pouring water into quicklime. Smoking was carried out using a method of addition, and the ignition and smoke conditions were observed, and the results shown in the table below were obtained.

[Table] As a result of the test, the decomposition temperature is as shown in the comparative test.
When an organic blowing agent with a temperature higher than 250℃ is used (Comparative Example 1), when the thickness of the plastic film exceeds 50μ (Comparative Example 2), when a material other than polyethylene is used as the laminate film material (Comparative Example 3) ), ignition failure is often observed, and when the conventional smoking method of adding water to quicklime is applied (Comparative Example 4), the reaction is rapid and the entire bag ruptures, causing the contents to scatter. It was inappropriate. Therefore, it has become clear that a smoking treatment with excellent smoking efficiency can be obtained only when the three elements of an appropriate organic blowing agent, plastic film, and smoking method are in place. [Comparative Test 2] Regarding the smoked insecticide of Example 2, the sealing temperature was examined by changing the material and thickness of the plastic film, and the results were as shown in the following table.

[Table] Since the foaming agent foams at around 140℃, the sealing temperature must be set as low as possible for manufacturing control purposes, and laminates made of materials other than polyethylene or with a total thickness exceeding 50μ are unsuitable. It was hot. As can be seen from this comparative test, an insecticide with excellent smoking efficiency can only be obtained if the three elements of smoking method (ignition method), organic foaming agent, and plastic film material and thickness are met. .

[Brief explanation of drawings]

FIGS. 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 for use is partially peeled off. A...Bag containing insecticide, B...Container body, C...
Double sheet, D... conductor wire, N... nichrome wire,
1... Plastic film, 2... Insecticidal composition, 3... Aluminum foil, 4... Smoke hole, 5
...Release paper.

Claims (1)

[Claims] 1 Pyrethroid insecticidal ingredients and decomposition temperature of 250℃
In a container in which a bag made of polyethylene laminate plastic film filled and sealed with a mixture with the following organic blowing agent is housed so as to be in contact with means capable of conducting electricity and generating heat using a battery, a large number of holes are distributed through the openings on the top surface of the container. A smoking insecticide characterized by sealing aluminum foil with a double sheet covered with release paper.