JPS5849304A - Fumigating insecticide - Google Patents

Abstract

PURPOSE:To provide the titled insecticide which can be used safely without restriction of the fumigating place, preventing the thermal decomposition of pyrethroid during fumigation, by packaging expanded vermiculite adsorbed with pyrethroid and an oxidation-type chemical heat-generating material with a particular packaging material. CONSTITUTION:Expanded vermiculite is adsorbed with pyrethroid harmless to man and animals and having high insecticidal effect and knockdown, and double- packaged together with an oxidation-type chemical heat-generating material as a heater. The inner packaging material is a gas-permeable material, preferably Japanese paper, etc., and the outer packaging material is an impermeable material, preferably aluminum foil, etc. The outer packaging material is teared off in use to expose the inner packaging material to air and to make the contained heat-generating material, etc. with oxygen, thereby effecting the fumigation of the pyrethroid. The oxidation-type chemical heat-generating material is composed of the first agent consisting of a metal such as Fe and Al or a compound containing said metal such as iron oxide, and the second agent consisting of an alkali metal sulfide, etc. USE:A body warmer, food-heating material, etc.

Description

[Detailed Description of the Invention] The present invention provides a fumigated insecticide containing pyrethroid as a main component.
This invention relates to an improved insecticide that uses an oxidized chemical heating element as a heating element.

To kill insects using insecticides whose main ingredients are pyrethroids such as allethrin, pyrethrin, and flamethrin, fumigation methods such as pyrethrum powder and mosquito coils are used, or solutions of these active ingredients are heated to evaporate or sprayed. Practical methods include forming fibrous or porous magnetic materials, synthetic resins, or mineral materials, adhering them to the moldings, heating them on an electric heating plate, and fumigating them.

However, if it is smoked like mosquito coil, it will be 700~SO.
Because it comes into contact with a high temperature area of 0°C, the main components (A) to 95C have the disadvantage of thermally decomposing and becoming ineffective, and methods that involve spraying or evaporating solutions are dangerous in handling and require special care. It was said that On the other hand, when pyrethroids are adsorbed onto molded products made of fibers or other materials and then smoked on an electric heating board at 120-IIO'C, they not only emit a burning odor and give an unpleasant feeling, but also have a medicinal component of 50-70%. % undergoes thermal decomposition or is wasted and is wasteful.

Furthermore, the method of using electric heating plates poses a risk of fire or burns, and there are restrictions on where they can be used, meaning that they cannot be used anywhere that electricity is available. .

Therefore, the inventor of the present invention sought to prevent the thermal decomposition of pyrethroid, the main medicinal ingredient, when heated, and to limit the use places in a safe manner.
We conducted various studies with the aim of providing fumigated insecticides that could be used without using fibers or molding materials.
In addition, if an oxidized chemical heating element is used instead of an electric heating plate as a heating element, and these are packaged with breathable and impermeable materials, a safer and more effective fumigation insecticide than K can be obtained. was discovered.

[The present invention is a fumigation-type insecticidal material in which foamed perky kerite adsorbed with pyrethroids and an oxidized chemical heating element are packaged with a breathable material on the inside and an impermeable material on the outside, and are brought into contact with oxygen and fumigated when used. This is what we provide.

To explain the present invention in more detail, the generally widely used and proposed fumigation mats are made of fibrous or porous molded plates, and the fixing agent used during production or the material itself causes a burning odor. Therefore, conventional adsorbents have disadvantages. Therefore, we have discovered the uniqueness of oga, foamed granules, and a-mikielite, which we researched into a material that does not use molding aids and basically does not emit a burning odor. Nono-
Micufite is a natural K11i aluminum magnesium silicate ore, and its structure is layered, so when heated, it becomes foamed granules with a fine layered structure. This foamed Nono-jculite has the property of adsorbing various substances between its layers, and can be used as a granular adsorbent without special molding treatment.

and tLpc when adsorbing HiL/Sroid.

It is common to dissolve the liquid into a solvent such as a low boiling point alcohol or hydrocarbon water, treat it by a method such as spraying or impregnation, and then remove the solvent under reduced pressure. In addition to this wet method, dry processing methods such as vacuum sublimation can also be used, and various forms can be adopted depending on the conditions. The layered structure of gnoculite is basically not destroyed even if it is coarsely pulverized, so it can be used by adjusting the particle size to the desired size. Usually, it is easy to use the same amount as the main ingredient of the chemical heating element that is used together with it.

The heating element used in the present invention is not an incense stick or an electric heating plate commonly used in the past, but a chemical heating element that utilizes a chemical reaction.

Many types of heating elements using chemical reactions are known, such as those using oxidation reactions, neutralization reactions, dissolution reactions, and electrochemical reactions, but not all of them can be used. Reactions such as hydration, dissolution, neutralization, and electrochemical reactions are usually carried out in an aqueous solvent system or other solution system. When foamed kerite with a layered structure comes into contact with these systems, it absorbs the exothermic solvent and becomes an obstacle to the volatilization of the adsorbed pyrethroids, and it is necessary to use an airtight film or metal foil as a packaging material. This is not preferable because it makes it difficult to apply it to fumigation insecticidal applications.

The chemical heating elements suitable for the purpose of the present invention are oxidized chemical heating elements of the dry method rather than those of the wet method.

Oxidized chemical heating elements usually contain iron, al<=rum, and other metals themselves or compounds containing these metals, such as iron carbide as the first agent and alkali metal sulfides, manganese dioxide, sodium chloride, etc. as the second agent. It is configured as. These tuna agent and second agent are stable on their own, but when they are mixed together and then brought into contact with oxygen, they generate heat, and are useful for heating food, heating molds, and automobiles. It is widely used in equipment, IT for keeping warm, etc. The heat generation temperature of this heating element is controlled by the amount of the first agent, the second agent, the heat retention agent, and the amount of heat generation regulator, and in normal heating systems, the temperature is around (a) ℃ due to safety considerations. The dosage is adjusted so that the duration is 10 to 10-odd hours, but it is possible to measure the rise or fall of the temperature depending on the conditions of use.

The foamed luxury material and the oxidized chemical heating element having adsorbed rethroid are then first wrapped with a breathable material on the inner ring, and further wrapped with an air-impermeable or oxygen-impermeable material on the outside. In that case, the first agent and second agent of the heating element and the //-
It is also possible to uniformly combine all of the electric kiekielite in a non-oxygen system, wrap it in a breathable material, and then wrap it in an impermeable material. Alternatively, the heating element first and second parts may be mixed together. It is also possible to double-wrap the package with a breathable material and a non-breathable material on each side without mixing. In the latter case, appropriate amounts may be added to both the first agent and the second agent, or the required amount may be added to either one.

The breathable material is preferably Japanese paper, and other materials such as outer mesh and cloth may also be used. It is appropriate that the A-miculite packaged inside the A-miculite has good volatility of the adsorbed Pires pyrite, and that it is easy to see by hand during the mission and is not too stiff. As the impermeable material, aluminum foil is preferably used;
Various laminate films such as I-Liethylene Ce A7 Anne can also be used satisfactorily.

In use, the package made of impermeable material is first torn to expose the package made of breathable material to the air, and the heating element inside comes into contact with oxygen, causing the heating element to generate heat. It is preferable to rub the package made of impermeable material by hand from the outside in order to ensure good contact with oxygen up to the center.

When the particle shape of the /I-miculite is made to be similar to that of the first and second heating element parts, mixing is facilitated. Nononculite itself does not have a foaming effect, so if it is mixed in too much, it will suppress heat generation, but up to an appropriate amount, it will not be involved in heat generation or will increase the internal temperature due to its heat storage effect. You can expect good results. Normally, it is desirable to keep it below 30-(capacity ratio) of the heating element.

The amount of pyrethroid P to be adsorbed to this A-nculite may be used only once, and although the amount varies depending on the potency, it may be used in an amount of about 100 to 300 M9 of alleslimase.

According to the insecticidal material of the present invention, the Noyori-kenculite dispersed in the heating element is uniformly heated throughout the body and is not locally heated, so that it has a temperature of 120 to 15
There is no need to raise the temperature to 0℃, and the adsorbed pyrethroids are first fumigated near the surface layer of Nonokenculite at the beginning of heat generation, increasing the drug concentration in the atmosphere within a short period of time, and flying within the atmosphere. It has a knockdown effect or a lethal effect by causing flies and insects traveling in the waterfall to fall or roll over, and has since been adsorbed inside the layered structure.
is sequentially volatilized, which has the effect of maintaining the drug concentration in the atmosphere. Therefore, in the present invention, it is essential that the drug adsorbent be in the form of particles with a layered structure such as perculite.

As described above, the fumigated insecticidal material of the present invention is harmless to humans and livestock because it has Pires 4-P as its main ingredient, which has a large insecticidal and knockdown effect, and since it does not use an electric heating plate, there is no danger of smoke. There are no restrictions on usage. Furthermore, there is no smoldering heat due to local heating in the heating section, so there is no odor correction, and there is no side decomposition reaction of the drug, so there is no discomfort in the vicinity.

Therefore, it can be used comfortably and safely for a long time, not only in a room, but also outdoors or in a car, where electricity is not easily available or where it is dangerous to use fire, making it practically effective.

Examples of the present invention are listed below.

Example 1 Dissolve 100 da of 7 lametrin in 2 cc of methanol,
After this was absorbed into 1 g of foamed non-mictite (9) mesh, methanol was sufficiently removed under reduced pressure to prepare 7 lametrin-adsorbed 9-mickielite.

On the other hand, a chemical heating element 7 using 50 g of iron carbide of Ka-I mesh as the first agent and 20 g of sulfurized saw of the same particle size as the second agent.
After that, the mixture was uniformly mixed under the above-mentioned N2 gas, wrapped in Japanese paper, and then wrapped in aluminum foil (sample-1).

(Sample-1) at a temperature of 5°C with a diameter of 253mm. Place it in a container with a height 11 glass cylinder whose top and bottom are closed with glass plates, tear the outer aluminum foil wrapping using the usual method, and rub the exposed inner Japanese paper wrapping with your hands until it reaches about 1'''CK. It was heated and fumigated.

After 12 hours, wipe the flamethrin that had condensed on the internal wall surface with absorbent cotton containing petroleum ether, extract it with petroleum ether, and gas chromatography! As a result of analyzing the volatilized 7 lametrino using Togelafy, it was 70~, and the effective volatilization rate was 70-.

Example-2 After placing a house-sized fish in a sealed 4-piece tent (
Sample 1) was heated according to a conventional method, and the number of fumigated insects was examined over time. Two insects appeared in 8 minutes after heating, and 1 in 15 minutes.
The results were good, with 6 fish and 19 fish in the (capital) portion. .

Example 23 In the open tent of Example 2, (sample-1) was heated and left for 2 hours, then sealed, kneaded well again to reheat, house flies were added, and the tent was sealed. The number of supine mice tested after one hour was 114, which was good.

Example-4 Allethrin 1501 was used instead of 7lametrin in Example-1.
Sample 2 was prepared in the same manner using Example 9, and the supine rate was examined in the same manner as in Example 2. It was found to be good, with 18 mice, or 90 mice, in 9 minutes. .

Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] This is a fumigation-type insecticidal material in which foamed/siliconcurite adsorbed with Zeres tetrade and an oxidized chemical heating element are packaged with a breathable material on the inside and an impermeable material on the outside, and are brought into contact with oxygen and fumigated when used.