TW202207802A - Sustained mosquito incense - Google Patents

Abstract

Provided is a long-acting mosquito-repelling incense allowing an insecticidal effect to persist for a long period of time even when burned for a short period of time while reducing irritation during the burning. The long-acting mosquito-repelling incense has an insecticidal effect that persists even after being burned and contains a carbide base material having an iodine adsorption capability of 200 mg/g or lower and at least one insecticidal component selected from the group consisting of metofluthrin, profluthrin, and transfluthrin. The insecticidal component volatilization amount per unit time during the burning is set to be 0.05 to 15 mg/minute, and the burning time is set to fall within 30 minutes.

Description

Continuous mosquito repellent incense

The present invention relates to a persistent mosquito repellent incense that maintains the insecticidal effect even after burning.

As a product for repelling flying pests such as mosquitoes, mosquito-killing incense sticks are widely used that scatter insecticidal components in a space to be treated by fumigation. Mosquito-killing incense sticks are designed to match the bedtime of human beings. The burning time of a column is set at about 7 to 8 hours. Until it burns out, the pests existing in the space of the treatment object will be knocked down or killed, and then the space will be eliminated or eliminated. Act in a way that avoids pests.

However, in recent years, due to the maintenance of the sanitary environment and changes in housing affairs, especially in the buildings of the city department, there are cases where the airtightness of the residence is progressing, reducing the chance of pests such as mosquitoes entering the building from outside the building. . Therefore, if the mosquitoes in the room are repelled before going to bed, it is no longer necessary to disperse the insecticidal ingredients continuously during the bedtime as in the past. In view of this situation, it has been considered to be a basic mosquito repellent coil incense that has been used continuously for a long time so far, and the proposal attempts to shorten the burning time.

For example, there is a mosquito coil in which room temperature volatile pyrethrins such as Metternine, Profluthrin, and Beverage are used as the insecticidal components (for example, refer to Patent Document 1). In the mosquito repellent incense stick of Patent Document 1, the insecticidal components remain in the air for a long period of time even after burning, so even if the burning time is shortened, the insecticidal effect is continued for a long time. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-12056

[The problem to be solved by the invention]

However, in anti-mosquito incense sticks, products that reduce odor or irritation due to insecticidal ingredients or fragrance ingredients are sought. However, in Patent Document 1, the main focus is to volatilize a necessary amount of insecticidal components while shortening the burning time, and there is still room for research on the reduction of the irritation at the time of burning.

The present invention has been made in view of the above-mentioned problems, and aims to provide a persistent mosquito-killing incense stick which can maintain the insecticidal effect for a long time even if it is burned for a short time while reducing the irritation at the time of burning. [means to solve the problem]

The characteristic structure of the persistent mosquito repellent incense of the present invention for solving the above-mentioned problems is that it is a persistent mosquito repellent incense that maintains the insecticidal effect even after burning, and it is characterized by containing: At least one insecticidal ingredient selected from the group consisting of Metternine, Profluthrin and Beverage, and a carbide substrate having an iodine adsorption capacity of 200 mg/g or less.

In addition to containing at least one insecticidal ingredient selected from the group consisting of Metternine, Profluthrin and Beverage, the persistent mosquito repellent incense according to the present composition contains an iodine adsorption energy of 200 mg/ For carbide substrates below g, even after burning, the insecticidal components remain in the air for a long time, so the insecticidal effect can be sustained for a long time. In addition, the carbide substrate having an iodine adsorption capacity of 200 mg/g or less can prevent excessive decomposition of the insecticidal component and reduce the insecticidal effect, and can reduce odor or irritation caused by smoke or the like during combustion.

In relation to the persistent mosquito-killing incense stick of the present invention, preferably The volatilization amount per unit time of the above-mentioned insecticidal components at the time of burning is set at 0.05 to 15 mg/min.

According to the continuous anti-mosquito incense stick of the present composition, since the amount of volatilization of the insecticidal component per unit time is within the above-mentioned range, a sufficient amount of the insecticidal component can be volatilized into the air even if it is burned for a short time.

In relation to the persistent mosquito-killing incense stick of the present invention, preferably Set the burn time to less than 30 minutes.

According to the continuous anti-mosquito incense stick of the present composition, by setting the burning time within 30 minutes, the incense stick is burned only before going to bed, and mosquitoes can be controlled, and it is an easy-to-use product.

In relation to the persistent mosquito-killing incense stick of the present invention, preferably The duration of the insecticidal effect after burning is set to 8 hours or more.

According to the persistent mosquito-killing incense stick of the present composition, by setting the duration of the insecticidal effect after burning to 8 hours or more, when used at night, humans can sleep comfortably without being bitten by mosquitoes all night. In addition, if the burning time is set within 30 minutes, and the duration of the insecticidal effect after each burning is set at 8 hours, since the fire of the continuous mosquito-killing incense will be eliminated when people are going to sleep, there is no need to worry about fire, even if It can also be used safely at night.

。Regarding the continuous mosquito-killing coil incense of the present invention, it is preferable that the blending amount of the above-mentioned insecticidal components is set as C _I (mg), and the volatilized amount of the above-mentioned insecticidal components at the time of complete combustion is set as V (mg). , set in a way that satisfies the following formula (1),

.

According to the persistent mosquito repellent incense stick of the present configuration, by satisfying the above-mentioned formula (1), a sufficient amount of the insecticidal component can be volatilized in the air while suppressing the blending amount of the insecticidal component.

。In the persistent mosquito repellent incense of the present invention, it is preferable to set the blending amount of the above-mentioned insecticidal ingredients as C _I (mg), the blending amount of the aforementioned carbide base material as C _B (g), and the When the iodine adsorption energy of the aforementioned carbide substrate is determined as A (mg/g), the following formula (2) is satisfied:

.

According to the persistent mosquito repellent incense stick of the present configuration, by satisfying the above formula (2), it is possible to prevent the excessive decomposition of the insecticidal components by the iodine adsorption energy of the carbide substrate, and to maintain the insecticidal effect for a long time after combustion. An appropriate amount of the insecticidal ingredient continues to dissipate.

Hereinafter, the persistent mosquito repellent incense stick of the present invention will be described. However, the present invention is not limited to the configurations described in the embodiments described below.

[Persistent mosquito repellent incense] The persistent mosquito repellent incense stick of the present invention contains an insecticidal ingredient and a carbide base material, for example, by adding an appropriate amount of water to a mixed powder containing an insecticidal ingredient and a carbide base material, and kneading, After molding by an extruder, a punching machine, etc., it is obtained by natural drying or heat drying. In the mixed powder, as other base materials, combustion accelerants, extenders and binders can be blended. In addition, the insecticidal ingredients are not directly mixed into the mixed powder, and it may be carried out by spraying or coating the liquid preparation containing the insecticidal ingredients and the like after molding. The size of the persistent mosquito repellent incense is preferably set to 100mm or less in total length, 7mm or less in thickness, and 5g or less in weight, more preferably 20mm or more in total length and 90mm in total length, 2mm or more in thickness and 5mm in thickness, and 0.2g or more in weight and 3g or less in weight. As the shape of the continuous mosquito repellent incense stick, a rod shape, a spiral shape, a cone shape, a plate shape, etc. can be appropriately selected according to the purpose of use, but a rod shape, a spiral shape, and a plate shape are preferable.

As the insecticidal component, pyrethrin-based insecticidal components having room temperature volatilization properties such as Metrene, Profluthrin, or Bevering are used. In the chemical structure of these pyrethrin-based insecticidal ingredients, when there are optical isomers or geometric isomers based on uneven carbons or double bonds, any isomers can be used. . These pyrethrin-based insecticidal components may be used alone or as a mixture of two or more, but it is preferable to include metrinin. Here, the term "having normal temperature volatility" means that the vapor pressure at 30°C is 2×10 ^-4 to 1×10 ^-2 mmHg. Due to their volatile properties at room temperature, Metinine, Profluthrin and Bifulin remain in the air after being burned for a long time, so they can continue to have insecticidal effects for a long time. In addition, Metternine, Profluthrin, and Bifulin can exhibit a sustained insecticidal effect by partially adhering to the wall surface after volatilization, and by contacting mosquitoes that have the habit of stopping on the wall surface and the like. In addition, in this specification, the insecticidal effect is not only the effect of killing or knocking down the pests, but also the pest repelling effect that the pests do not approach.

The content of the insecticidal component is preferably 0.1 to 5% by weight, more preferably 0.2 to 3% by weight, based on the weight of the entire persistent mosquito-killing incense stick. When the content of the insecticidal component is less than 0.1% by weight, there is a possibility that a sufficient insecticidal effect cannot be obtained. When the content of the insecticidal component exceeds 5% by weight, the insecticidal component is not a component that contributes to direct combustion, so there is a possibility that the persistent mosquito coil is extinguished.

As the carbide substrate, a carbide substrate having an iodine adsorption capacity of 200 mg/g or less is used. Specific examples of the carbide substrate include charcoal, bamboo charcoal, plant-based activated carbon, coconut shell charcoal, and coffee meal charcoal and other plant-derived carbide substrates, as well as carbon black, graphite, acetylene black, and coal-based carbonaceous materials. Carbide substrates derived from non-vegetable substances such as activated carbon and petroleum-based activated carbon, especially those derived from vegetable substances are preferred. Although the details will be described in the following examples, when the continuous anti-mosquito incense is blended with a carbide substrate with an iodine adsorption energy of 200 mg/g or less, it is possible to prevent killing due to the iodine adsorption energy of the carbide substrate. Excessive decomposition of insect components can effectively reduce or alleviate the odor or irritation caused by the burning of persistent mosquito coils. When the iodine adsorption energy of the carbide base material exceeds 200 mg/g, the insecticidal components may be excessively decomposed, and there is a possibility that a sufficient insecticidal effect cannot be obtained. Moreover, in the persistent mosquito repellent incense stick of the present invention, a plurality of types of carbide substrates having different iodine adsorption capacities may be mixed and used so that the iodine adsorption capacities may be 200 mg/g or less. The iodine adsorption energy is determined according to the activated carbon test method specified in JIS K 1474.

The content of the carbide base material is preferably 20 to 80% by weight with respect to the weight of the entire persistent mosquito repellent incense stick. When the content of the carbide base material is less than 20% by weight, there is a possibility that the odor or irritation caused by smoke or the like during combustion cannot be sufficiently alleviated. When the content of the carbide base material exceeds 80% by weight, there is a possibility that the formability and strength of the persistent mosquito repellent incense cannot be ensured.

Combustion accelerants are blended for stable burning and continuous mosquito-killing incense sticks. Extenders are blended to improve the formability of persistent mosquito coils. The binder is blended with the raw materials as a solidified binder. Combustion accelerants, extenders and binders become the base material for persistent mosquito repellent incense sticks. When exemplifying suitable combustion accelerants, wood powder, pyrethrum extract meal powder, citrus peel powder, tea powder, coconut shell powder, etc. can be mentioned. These accelerants can be used alone or as a mixture of two or more. As an example of a suitable extender, diatomaceous earth, talc, clay, kaolin and the like can be mentioned. These extenders can be used alone or as a mixture of two or more. As an example of a suitable binder, ground flour, starch (alpha starch, tapioca flour, etc.), methylcellulose, carboxymethylcellulose (CMC), etc. are mentioned. These binders can be used alone or as a mixture of two or more. The carbide base material, the combustion accelerant, the extender and the binder are the base material of the persistent mosquito repellent incense, and the content of the substrate is preferably 90% by weight or more relative to the total weight of the persistent mosquito repellent incense.

Mosquito-killing incense sticks are usually given a scent suitable for incense sticks, but recently, various volatile fragrance ingredients are sometimes added for the purpose of obtaining an aroma effect or a relaxing effect. The persistent mosquito repellent incense of the present invention can suppress the odor or irritation caused by the smoke or the like during combustion, regardless of whether or not the fragrance component is added, and maintain the insecticidal effect for a long time, but even in the persistent mosquito repellent incense of the present invention, Various fragrance components may be added for the purpose of obtaining an aroma effect or a relaxation effect. Examples of fragrance components include galaxolide, musk ketone, hexyl cinnamaldehyde, Iso E Super, methyl dihydrojasmonate, ethylene brassylate, geraniol, synthetic oakmoss ( methyl atrarate), hexyl salicylate, tricyclodecenyl acetate, β-naphthyl methyl ketone (oranger crystal), ambroxan, Tonalide (6-Acetyl-1,1,2,4,4,7-Hexamethyltetrahydronaphthalene), γ-undecalactone, Cashmeran, Calone, Sunflower aldehyde ( heliotropin), indenyl-2,4-dioxane, α-isomethyl ionone (ionone), indole, methyl cedryl ketone (cedryl ketone), methyl β-naphthyl ketone, rodaline (rosephenone), lavender (coumarin), vanillin (vanillin), styrax resinoid (styrax resinoid), benzyl benzoate, undecaldehyde, benzyl salicylate, ionone (ionone), alpha-violet Ketone (ionone), beta-ionone (ionone), lily aldehyde (lily aldehyde), 3,5-dinitro-2,6-dimethyl-4-t-butylacetophenone, acetocedar alkene, 2-cyclohexylene-2-phenylacetaldehyde, isolongifolanone and cis-3-hexenal, etc. These fragrance ingredients can be used alone or as a mixture of two or more. The content of the fragrance component is preferably 0.001 to 5% by weight, more preferably 0.01 to 1% by weight, based on the weight of the entire persistent mosquito repellent incense stick. When the content of the fragrance component is less than 0.001% by weight, there is a possibility that a sufficient aroma cannot be produced. When content of a fragrance|flavor component exceeds 5 weight%, there exists a possibility that an odor or irritation|stimulation may be strengthened too much.

In the persistent mosquito repellent incense stick of the present invention, as other components, antifungal agents, preservatives, stabilizers, efficacy enhancers, deodorants and the like may also be contained. When an antifungal agent or a preservative is exemplified, dehydroacetate, sorbate, p-hydroxybenzoate, etc. are mentioned. When the stabilizer is exemplified, 2,6-di-tert-butyl-4-methylphenol (BHT), 2,2'-methylenebis(4-methyl-6-tert-butylphenol) can be mentioned. , 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-butylenebis(3-methyl-6-tert-butylphenol), 4, 4'-thiobis(3-methyl-6-tert-butylphenol), 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)- 4-methylphenyl acrylate, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, etc. By adding such a stabilizer, not only the stability of the insecticidal ingredients over time during storage, but also the stability during smoking can be significantly enhanced, which in turn also contributes to the continuation of the efficacy of the active ingredients after volatilization. improvement. The amount of the stabilizer added is preferably 0.01 to 0.5 times the amount of the insecticidal component. Examples of potency enhancers include piperonyl butoxide, N-(2-ethylhexyl)-bicyclo[2,2,1]hept-5-ene-2,3-dicarboxyimide Wait. In addition, coloring agents such as malachite green and food additives (e.g., edible blue No. 1, edible yellow No. 4, edible red No. 106, etc.) may be contained in the persistent mosquito repellent incense.

[burning time] In the past, the mosquito repellent incense sticks used the burning smoke to disperse the insecticidal ingredients to prevent mosquitoes, etc., but the use at bedtime, etc., also avoided the generation of smoke. Since the insecticidal ingredient remains in the air even after burning for a long time, the insecticidal effect can be sustained, and the usability can be improved by setting the burning time in an appropriate range. The burning time of the continuous mosquito-killing incense stick of the present invention is preferably within 30 minutes from the time of the fire to the burnout. By setting the burning time within 30 minutes, even after a long time at bedtime, mosquitoes can be prevented, but in a short time before going to bed or just after going to bed, the continuous burning of mosquito-killing incense sticks is completed, and there is no need to worry about smoke. Go to bed peacefully. Furthermore, after the continuous mosquito-killing incense is burned, the duration of the insecticidal effect (the time for which mosquitoes can be controlled) is preferably 8 hours or more, more preferably 10 hours or more, and most preferably 12 hours or more. By setting the duration of the insecticidal effect after burning to more than 8 hours, for example, when used at night, humans can sleep comfortably without being bitten by mosquitoes all night. In addition, if each burning time is set within 30 minutes, and the duration of the insecticidal effect after burning is set at 8 hours, since the fire of the continuous mosquito-killing incense will disappear when people are going to sleep, there is no need to worry about fire, even at night. You can also use it with peace of mind. In this way, although the burning time of the persistent mosquito-killing incense stick of the present invention is short, the insecticidal effect is continued after a long time, so it is suitable for indoor use, especially suitable for use in a highly airtight space. However, the persistent mosquito repellent incense of the present invention can of course be used outdoors.

[Volatile amount of insecticidal ingredients per unit time] By setting the volatilization amount of the insecticidal component per unit time in an appropriate range during combustion, the continuous mosquito coil of the present invention can disperse a sufficient amount of the insecticidal component in the air even if it is burned for a short time. middle. Here, the continuous anti-mosquito incense is the volatilized amount of the insecticidal ingredients when it is completely burned. It is connected to the exhaust bell with a glass tube containing silica gel, so that the continuous anti-mosquito incense can be completely burned, And by sucking the air in the exhaust bell with a pump, trapping the insecticidal components scattered by combustion, and calculating the trapped insecticidal components by gas chromatography analysis. The volatilization amount of the insecticidal component calculated in this way is divided by the volatilization amount per unit time of the burning time, and it is preferably 0.05 to 15 mg/min, more preferably 0.1 to 10 mg/min. If the volatilization amount of the insecticidal ingredient per unit time is within the above-mentioned range, even if it is burned for a short time of 30 minutes or less, an appropriate amount of the insecticidal ingredient can be volatilized into the air. Moreover, if the volatilization amount per unit time of the insecticidal component is within the above-mentioned range, even if the iodine adsorption capacity of the carbide substrate is 200 mg/g or less, the odor or irritation caused by smoke and the like during combustion can be reduced. When the volatilized amount of the insecticidal ingredient per unit time is less than 0.05 mg/min, there is a possibility that a sufficient amount of the insecticidal ingredient cannot be dispersed in the air after burning for a short time of 30 minutes or less, and the insecticidal effect cannot be sustained. When the volatilized amount per unit time of the insecticidal component exceeds 15 mg/min, there is a possibility that the odor or irritation of the smoke caused by the smoke or the like during combustion cannot be sufficiently relieved. Furthermore, since the insecticidal component is not a component that contributes to direct combustion, there is a possibility of the extinction of the persistent mosquito coil incense.

[Retention rate of insecticidal components] In the continuous mosquito coil incense of the present invention, the blending amount of the insecticidal components is defined as _CI (mg), and the volatilized amount of the insecticidal components at the time of complete combustion is defined as V (mg) In this case, the ratio of the volatilization amount V of the insecticidal component to the blending amount CI of the insecticidal component, that is, the insecticidal component retention rate, preferably satisfies the following formula ( ₁ ). Insecticidal ingredient maintenance rate=(V/CI )×100≧40 ･･･( ₁ ) By satisfying the condition of formula (1), the insecticidal ingredient is excessively decomposed during the storage and combustion of the persistent mosquito coil incense Therefore, while suppressing the blending amount of the insecticidal components during manufacture, a sufficient amount of the insecticidal components can be dispersed into the air during combustion. When the maintenance rate of the insecticidal ingredients is less than 40%, there is a possibility that the amount of the necessary insecticidal ingredients to be blended in the manufacture of the continuous mosquito-killing incense will increase, which may be economically disadvantageous. In addition, since the insecticidal component is not a component that contributes to direct combustion, by increasing the blending amount of the insecticidal component, there is a possibility of the extinction of the persistent mosquito coil incense.

[Insecticidal ingredient/adsorption energy ratio] In the mosquito coil incense, the compounding amount of the insecticidal ingredient is C _I (mg), the compounding amount of the carbide substrate is C _B (g), and the carbide When the iodine adsorption energy of the substrate is set as A (mg/g), the product of the admixture amount C _B of the carbide substrate and the iodine adsorption energy A of the carbide substrate represents the iodine adsorption of the whole persistent mosquito-killing incense stick total amount. Here, the ratio of the blending amount CI of the insecticidal component to the product of the compounding amount C _B of the carbide substrate and the iodine adsorption energy _A of the carbide substrate, that is, the insecticidal component/adsorption energy ratio, is effective in killing the The volatilization amount of the insect component has an influence. In the persistent mosquito-killing incense stick of the present invention, the insecticidal component/adsorption energy ratio preferably satisfies the following formula (2). Insecticidal ingredient/adsorption energy ratio=C _I /(C _B ×A)≧3×10 ^-2 ･･･(2) By satisfying the formula (2), with respect to the blending amount of the insecticidal ingredient at the time of manufacture, During the storage and combustion of the persistent mosquito repellent incense, the proportion of the insecticidal components that can be decomposed by the iodine adsorption of the carbide substrate becomes very small. Therefore, even if a part of the insecticidal components are decomposed during the storage and combustion of the persistent mosquito coil incense, the appropriate amount of the insecticidal components that can sustain the insecticidal effect for a long time can be dissipated after the combustion. When the ratio of insecticidal ingredient/adsorption energy is less than 3×10 ^-2 , relative to the blending amount of the insecticidal ingredient at the time of manufacture, during the storage and combustion of the continuous mosquito-killing incense, the iodine of the carbide base material is used. The ratio of the insecticidal components that can be decomposed by adsorption increases, and there is a possibility that the insecticidal components that are scattered during combustion are insufficient.

[Pests targeted for control] The pests to be controlled by the persistent mosquito-killing coil incense of the present invention are not particularly limited, but for example, house mosquitoes such as house mosquitoes, house mosquitoes, tropical house mosquitoes, subterranean house mosquitoes, Aedes aegypti, Aedes mosquitoes, chironomids, house flies, white-spotted moths, flies, bees, horseflies, gnats, midges, clothes moths, etc. , cockroaches such as American cockroaches, black brown cockroaches, mites, ants, temperate bed bugs, rodents, skeleton-eating insects, corn weevil and other crawling pests, among these pests, especially for the domestic mosquito Class, Aedes, high effectiveness. [Example]

[Example 1] Charcoal powder A (50 parts by weight) with an iodine adsorption capacity of 25 mg/g as a carbide base material, Metinine (1.5 parts by weight) as an insecticidal ingredient, and a charcoal containing musk and musk ketone as a fragrance ingredient Mixed fragrance (0.8 parts by weight), vegetable powders as combustion accelerants and extenders, namely pyrethrum extract meal powder (17 parts by weight), wood powder (10.7 parts by weight) and diatomaceous earth (3 parts by weight), and Alpha starch (14 parts by weight) as a binder, and carboxymethyl cellulose (CMC) (3 parts by weight) were added with water (90 parts by weight) and sufficiently kneaded. The kneaded product was placed in an extruder and formed into a rod shape, and then dried until the moisture content was about 7 to 10% by weight to produce the persistent mosquito repellent incense stick of Example 1. The persistent mosquito-killing incense stick of Example 1 is one whose ratio of insecticidal ingredient/adsorption energy is 1.2 and satisfies the condition of the aforementioned formula (2).

When the persistent mosquito-killing incense stick of Example 1 was used in a room of 10 tatami meters (area 16.7m ² , height 2.5m, volume 41.7m ³ ), although it was burnt out in about 23 minutes, 12 hours passed after burning. Various pests such as mosquitoes did not approach. From this, it is considered that the insecticidal component remains sufficiently indoors even after 12 hours have elapsed after the continuous mosquito coil incense stick of Example 1 is burned. In addition, the continuous anti-mosquito incense stick of Example 1 produced a small amount of smoke during combustion, did not feel an irritating odor, and produced a faint floral odor. This scent brings relaxation and is suitable for use in bedrooms.

[Examples 2 to 12] Using charcoal powder A with an iodine adsorption energy of 25 mg/g as a carbide substrate, and charcoal powder B with an iodine adsorption energy of 838 mg/g, the blending shown in Table 1 was carried out according to the implementation. In Example 1, a persistent mosquito repellent incense having the characteristic constitution of the present invention was produced (Examples 2 to 12). The insecticidal ingredient/adsorption energy ratio of the persistent mosquito-killing incense sticks of Examples 2 to 12 is 3.1×10 ⁻² to 2.2, all of which satisfy the conditions of the aforementioned formula (2).

[Comparative Examples 1 to 3] Using charcoal powder A with an iodine adsorption energy of 25 mg/g as a carbide substrate, and/or charcoal powder B with an iodine adsorption energy of 838 mg/g, in the blends shown in Table 2, According to Example 1, persistent mosquito repellent incense sticks (Comparative Examples 1 to 3) not having the characteristic structure of the present invention were produced. Compared with the provisions of the present invention, the persistent mosquito repellent incense sticks of Comparative Examples 1 to 3 show that the iodine adsorption energy of the carbide substrate is larger, and the ratio of insecticidal components/adsorption energy is 7.2×10 ^-3 to 2.2× 10 ^-2 , which do not satisfy the condition of the aforementioned formula (2).

[Reference example] Without using the carbide base material with iodine adsorption capacity, in accordance with the blending shown in Table 2, according to Example 1, a persistent mosquito-killing incense stick (reference example) was produced.

The respective tests shown in the following (1) to (4) were performed using the persistent mosquito repellent incense sticks of Examples 1 to 12, Comparative Examples 1 to 3, and Reference Examples.

(1) Stability over time The insecticidal ingredients contained in the persistent mosquito coil incense after being stored at 50°C for 1 month were analyzed by gas chromatography. The combined amount was calculated to calculate the recovery rate of the insecticidal components. The stability over time was determined according to the following criteria. A: The recovery rate of insecticidal ingredients is more than 95% B: The recovery rate of insecticidal components is more than 90% and less than 95% C: The recovery rate of insecticidal ingredients is less than 90%

(2) Maintenance rate of insecticidal ingredients It is connected to the exhaust bell with a glass tube containing silica gel, so that the continuous mosquito repellent incense can be completely burned, and the air in the exhaust bell is sucked by a pump, trapped and evaporated by burning. The insecticidal components of the trapped insecticidal components are analyzed by gas chromatography to calculate the volatilization amount of the insecticidal components when the continuous mosquito coil incense is completely burned. Then, from the calculated volatilization amount and the blending amount of the insecticidal ingredient at the time of production, the insecticidal ingredient retention rate was calculated according to the above-mentioned formula (1).

(3) Hobbies In a glass cylinder with a diameter of 20cm and a height of 40cm, the continuous mosquito repellent incense was burned. The testers of 10 people rated the irritation mitigation and odor preference as 10 for the highest point and 1 for the lowest point. As the test result of the likability by the sensory test, the average value of the evaluations by 10 testers was calculated.

(4) Field insecticidal efficacy test In the center of a closed 25m ³ room, a persistent mosquito-killing incense was burned. After burning for 8 hours, 50 female adult mosquitoes were placed and exposed for 2 hours, and all the test mosquitoes were recovered. Meanwhile, with the passage of time, count the female adults of A. japonicus that fell on their backs, and set the time point at which 25 adult females of A. japonicus fell and turned on their backs as the KT ₅₀ value (rounded up below the decimal point).

The persistent mosquito-killing incense sticks of Examples 1 to 12, which contain Metinine, Profluthrin or Bifulin as insecticidal ingredients, and contain carbide substrates with an iodine adsorption capacity of less than 200 mg/g, were confirmed to increase over time. Excellent stability, the maintenance rate of insecticidal ingredients is more than 40% for all of them, even in a short time of burning within 30 minutes, the KT ₅₀ value after burning for 12 hours becomes less than 30 minutes, and excellent insecticidal effect can be obtained continuously. Effect. It is considered that the persistent mosquito repellent incense sticks of Examples 1 to 12 obtained the same degree of stability over time as the reference example not incorporating the carbide substrate with iodine adsorption energy, and the insecticidal effect after 12 hours of self-combustion. Therefore, by suppressing the iodine adsorption energy of the carbide substrate to be 200 mg/g or less, the decomposition of excess insecticidal components by the carbide substrate does not occur.

In addition, the persistent mosquito repellent incense stick of the reference example is concerned with the odor of smoke or the quantity of the smoke. The persistent mosquito repellent incense stick of Examples 1 to 12 is any fragrance with high liking after burning, and it is also It is easy to use because it is not excessively filled with smoke, and is excellent in irritation mitigation and odor preference. From the above, it is considered that the persistent mosquito repellent incense sticks of Examples 1 to 12 sufficiently obtain the effect of reducing the odor or irritation caused by the smoke or the like during combustion even if the iodine adsorption energy of the carbide base material is 200 mg/g or less.

In addition, among the persistent mosquito coils of Examples 1 to 12, it was observed that the amount of volatilized insecticidal components per unit time was relatively low (Examples 4 to 6, 8), and the tendency of the effective efficacy was slightly decreased. In addition, in Example 3 in which the amount of volatilization per unit time was as large as 10.2 mg/min, there was a case where the burning of the persistent mosquito-killing incense could not be continued to the end. Therefore, the volatilization amount of the insecticidal component per unit time is preferably 0.05-15 mg/min, more preferably 0.1-10 mg/min.

When comparing Example 9 with Example 1, although the blending amounts of the insecticidal components and the carbide substrate were the same, and only the types of fragrance components were different, the maintenance rate of the insecticidal components and the KT ₅₀ value after 12 hours of self-combustion Not much difference. When Example 10 was compared with Example 1, although the blending amounts of the insecticidal components and the carbide base were the same, and the point that no fragrance component was blended was different, the maintenance rate of the insecticidal components and the 12-hour self-combustion KT ₅₀ values are not much different. From this, it is thought that the type or blending amount of the fragrance component does not have a significant influence on the decomposition of the insecticidal component by the iodine adsorption energy of the carbide substrate.

On the other hand, as in Comparative Examples 1 to 3, although Metinine is contained as an insecticidal component, when a carbide substrate having an iodine adsorption capacity exceeding 200 mg/g is contained, the time-dependent stability of the insecticidal component is not sufficient. , the maintenance rate of insecticidal components is less than 40%, and the KT ₅₀ value after burning for 12 hours is also more than 120 minutes, and sufficient insecticidal effect cannot be obtained. This is considered to be because the iodine adsorption energy by the carbide substrate exceeds 200 mg/g, resulting in decomposition of excess insecticidal components by the carbide substrate. Moreover, in the persistent mosquito repellent incense sticks of Comparative Examples 1 to 3, it was difficult to feel the aroma due to the fragrance component, and it was a result that the smell was changed. [Industrial Availability]

The persistent mosquito-killing coil incense of the present invention can be used as a household or business-use mosquito-killing coil incense, and can be used in the purpose of controlling pests, especially suitable for use in the mosquitoes such as A. .

Claims (5)

A persistent mosquito-killing coil incense, which is a persistent mosquito-killing coil incense with continuous insecticidal effect even after burning, is characterized by containing: at least one insecticidal ingredient selected from the group consisting of Metofluthrin, Profluthrin and Transfluthrin, The volatilization amount per unit time of the above-mentioned insecticidal components during combustion is set at 0.1 to 15 mg/min. If the continuous mosquito-killing incense of claim 1, the burning time is set within 30 minutes. As claimed in claim 1 or 2, the persistent mosquito-killing incense stick shall set the duration of the insecticidal effect after burning to more than 8 hours. The continuous mosquito-killing incense according to claim 1 or 2, wherein the blending amount of the above-mentioned insecticidal components is defined as C _I (mg), and the volatilized amount of the above-mentioned insecticidal components when completely burned is defined as V (mg) , set in such a way as to satisfy the following formula (1),

. The persistent mosquito repellent incense according to claim 1 or 2, wherein the blending amount of the aforementioned insecticidal ingredients is set as C _I (mg), and the blending amount of the aforementioned carbide base material is set as _CB (g), When the iodine adsorption energy of the aforementioned carbide substrate is defined as A (mg/g), the following formula (2) is satisfied:

.