CN113993382A - Continuous mosquito-repellent incense coil - Google Patents
Continuous mosquito-repellent incense coil Download PDFInfo
- Publication number
- CN113993382A CN113993382A CN202080043712.5A CN202080043712A CN113993382A CN 113993382 A CN113993382 A CN 113993382A CN 202080043712 A CN202080043712 A CN 202080043712A CN 113993382 A CN113993382 A CN 113993382A
- Authority
- CN
- China
- Prior art keywords
- insecticidal
- mosquito coil
- persistent
- insecticidal component
- burning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N53/00—Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M1/00—Stationary means for catching or killing insects
- A01M1/20—Poisoning, narcotising, or burning insects
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/20—Combustible or heat-generating compositions
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
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- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
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Abstract
The invention provides a persistent linear mosquito coil which can reduce the stimulation during burning and can sustain the insecticidal effect for a long time even if the burning is short. The present invention is a persistent mosquito coil whose insecticidal effect is sustained even after burning, comprising: an insecticidal component selected from at least one of the group consisting of metofluthrin, proffluthrin and transfluthrin; and a carbide base material having an iodine adsorption capacity of 200mg/g or less, wherein the volatilization amount of the insecticidal component per unit time during combustion is set to 0.05 to 15 mg/min, and the combustion time is set to 30 minutes or less.
Description
Technical Field
The present invention relates to a persistent mosquito coil whose insecticidal effect is sustained even after burning.
Background
Mosquito coil incense, in which an insecticidal component is volatilized by fumigation into a space to be treated, is widely used as a product for repelling flying insects such as mosquitoes. The mosquito coil is set to have a burning time of about 7 to 8 hours in accordance with a bedtime of a person, and pests present in a space to be treated are knocked down or killed until the mosquito coil is burnt out, and the mosquito coil acts to exclude or repel the pests from the space.
However, in recent years, due to the provision of sanitary environments and changes in housing conditions, particularly in apartments in urban areas, the sealing of housing has been continued, and the chances of pests such as mosquitoes penetrating into buildings from the outside have been reduced. Therefore, if mosquitoes and the like existing in a room are removed before bedtime, it is not always necessary to continuously volatilize an insecticidal component during bedtime as in the conventional mosquito coil. In view of this situation, attempts have been made to shorten the burning time of mosquito coils which have been considered as the basic mosquito coil for a long time of continuous use.
For example, mosquito coils using a normally volatile pyrethrin such as metofluthrin, proffluthrin, transfluthrin as an insecticidal component are known (see, for example, patent document 1). The mosquito coil of patent document 1 has an insecticidal effect that is sustained for a long time even if the burning time is shortened because the insecticidal component remains in the air for a long time even after burning.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-12056
Disclosure of Invention
Problems to be solved by the invention
However, in the case of the mosquito coil, there is a demand for a product that reduces odor and irritation caused by an insecticidal component, a perfume component, smoke, and the like. However, patent document 1 has a main object of reducing the combustion time and volatilizing a necessary amount of an insecticidal component, and leaves room for study on reduction of the irritation during combustion.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a persistent mosquito coil that reduces irritation during combustion and can sustain an insecticidal effect for a long time even in a short-time combustion.
Means for solving the problems
The persistent mosquito coil according to the present invention for solving the above problems is a persistent mosquito coil in which an insecticidal effect is sustained even after burning, comprising:
an insecticidal component selected from at least one of the group consisting of metofluthrin, proffluthrin and transfluthrin; and
a carbide substrate having an iodine adsorption capacity of 200mg/g or less.
According to the persistent mosquito coil of the present configuration, the insecticidal effect can be maintained for a long time because the insecticidal component remains in the air for a long time even after burning because the persistent mosquito coil contains the insecticidal component selected from at least one of the group consisting of metofluthrin, proffluthrin, and transfluthrin and the carbide base having an iodine adsorption capacity of 200mg/g or less. Further, the carbide base material having an iodine adsorption capacity of 200mg/g or less can prevent the insecticidal effect from being lowered by excessive decomposition of the insecticidal component, and can reduce odor and irritation due to smoke and the like at the time of combustion.
In the persistent mosquito coil of the present invention, it is preferable that,
the amount of the insecticidal component volatilized per unit time during combustion is set to 0.05 to 15 mg/min.
According to the persistent mosquito coil of the present configuration, by setting the volatilization amount of the insecticidal component per unit time within the above range, a sufficient amount of the insecticidal component can be volatilized into the air even in a short-time combustion.
In the persistent mosquito coil of the present invention, it is preferable that,
the combustion time was set to 30 minutes or less.
According to the persistent mosquito coil of the present configuration, by setting the burning time to be within 30 minutes, mosquitoes can be prevented by burning the persistent mosquito coil just before bedtime, and the persistent mosquito coil is a product which is easy to use.
In the persistent mosquito coil of the present invention, it is preferable that,
the duration of the pesticidal effect after combustion is set to 8 hours or more.
According to the persistent mosquito coil of the present invention, the duration of the insecticidal effect after burning is set to 8 hours or more, so that when the mosquito coil is used at night, humans are not bitten by mosquitoes all over night and can sleep comfortably. Further, if the burning time is set to 30 minutes or less and the duration of the insecticidal effect after burning is set to 8 hours, the continuous mosquito coil is extinguished when a person is going to sleep, and therefore, there is no fear of a fire and the mosquito coil can be used safely even at night.
In the persistent mosquito coil of the present invention, it is preferable that,
the mixing amount of the insecticidal component is CI(mg), wherein the volatilization amount of the insecticidal component after complete combustion is represented by v (mg), and is set so as to satisfy the following formula (1):
(V/CI)×100≥40…(1)。
according to the persistent mosquito coil of the present configuration, by satisfying the above formula (1), a sufficient amount of the insecticidal component can be volatilized into the air while the amount of the insecticidal component to be added is suppressed.
In connection with the persistent mosquito coil of the present invention, preferably,
the mixing amount of the insecticidal component is CI(mg) the amount of the carbide base material added is CB(g) Wherein, assuming that the iodine adsorption capacity of the carbide substrate is A (mg/g), the following formula (2) is satisfied:
CI/(CB×A)≥3×10-2…(2)。
according to the persistent mosquito coil of the present configuration, by satisfying the above formula (2), it is possible to prevent the insecticidal component from being excessively decomposed due to the iodine adsorption ability of the carbide base material and to volatilize the insecticidal component in an amount appropriate for sustaining the insecticidal effect for a long time after combustion.
Detailed Description
Hereinafter, the persistent mosquito coil of the present invention will be described. However, the present invention is not intended to be limited to the configurations described in the embodiments described below.
[ continuous line mosquito-repellent incense ]
The persistent mosquito coil of the present invention contains an insecticidal component and a carbide base, and is obtained, for example, by adding an appropriate amount of water to a mixed powder containing an insecticidal component and a carbide base, kneading the mixture, molding the kneaded mixture by an extruder, a punching machine, or the like, and then naturally drying or heat drying the molded mixture. The mixed powder may contain a combustion improver, an extender, a binder, and the like as other base materials. The insecticidal component may be mixed with the mixed powder not directly, but may be sprayed or applied with a liquid agent containing the insecticidal component after molding. The dimensions of the persistent mosquito coil are preferably set to 100mm or less in the entire length, 7mm or less in the thickness, and 5g or less in the weight, and more preferably set to 20mm or more and 90mm or less in the entire length, 2mm or more and 5mm or less in the thickness, and 0.2g or more and 3g or less in the weight. The shape of the persistent mosquito coil may be appropriately selected from a rod, a spiral, a cone, a plate, and the like according to the purpose of use, but is preferably a rod, a spiral, or a plate.
As the insecticidal component, metofluthrin, proffluthrin, or transfluthrin, which is a pyrethroid-based insecticidal component having normal-temperature volatility, is used. When an optical isomer or a geometric isomer based on an asymmetric carbon or double bond exists in the chemical structure of these pyrethroid-based insecticidal components, any isomer may be used. These pyrethroid-based insecticidal components may be used alone or as a mixture of two or more, but preferably contain metofluthrin. Here, the term "having room-temperature volatility" means: vapor pressure at 30 ℃ of 2X 10-4～1×10-2mmHg. Mehoxybifenthrin, proffluthrin and transfluthrinHas normal temperature volatility, so the mosquito incense can remain in the air for a long time after the burning of the continuous linear mosquito incense, thereby the insecticidal effect can be continuously realized for a long time. Further, metofluthrin, proffluthrin and transfluthrin exhibit a persistent insecticidal effect because they partially adhere to a wall surface or the like after volatilization and come into contact with mosquitoes having a habit of stopping on the wall surface or the like. In the present specification, in addition to the effect of killing or knocking down the pests, the pest repellent effect of preventing the pests from coming close to the pest repellent effect is also included.
The content of the insecticidal component is preferably 0.1 to 5 wt%, more preferably 0.2 to 3 wt%, based on the weight of the whole persistent mosquito coil. When the content of the insecticidal component is less than 0.1% by weight, a sufficient insecticidal effect may not be obtained. When the content of the insecticidal component exceeds 5% by weight, since the insecticidal component is not a component contributing to direct combustion, there is a possibility that the persistent mosquito coil extinguishes by itself.
As the carbide substrate, a carbide substrate having an iodine adsorption capacity of 200mg/g or less is used. Specific examples of the carbide base material include: a carbide substrate derived from a plant such as charcoal, bamboo charcoal, vegetable activated carbon, coconut shell carbon, and coffee grounds carbon, and a carbide substrate derived from a non-vegetable such as carbon black, graphite, acetylene black, coal-based activated carbon, and petroleum-based activated carbon, and particularly preferably a carbide substrate derived from a vegetable. As will be described in detail in examples below, when a carbide base material having an iodine adsorption capacity of 200mg/g or less is incorporated in a persistent mosquito coil, it is possible to effectively reduce or alleviate odor or irritation caused by smoke or the like during burning of the persistent mosquito coil while preventing excessive decomposition of an insecticidal component due to the iodine adsorption capacity of the carbide base material. When the iodine adsorption capacity of the carbide base material exceeds 200mg/g, the insecticidal component may be excessively decomposed, and a sufficient insecticidal effect may not be obtained. In the persistent mosquito coil of the present invention, a plurality of types of carbide base materials having different iodine adsorption capacities may be mixed and used so that the iodine adsorption capacity is 200mg/g or less. The iodine adsorption capacity was measured according to the activated carbon test method defined in JIS K1474.
The content of the carbide base material is preferably 20 to 80 wt% based on the total weight of the continuous linear mosquito coil. If the content of the carbide base material is less than 20 wt%, there is a fear that the odor or irritation caused by smoke or the like during combustion cannot be sufficiently alleviated. If the content of the carbide base material exceeds 80 wt%, there is a fear that the formability and strength of the continuous linear mosquito coil cannot be secured.
The combustion improver (Japanese combustion improver) is compounded for stably burning the continuous linear mosquito-repellent incense. The bulking agent (Japanese bulking agent) is incorporated to improve the formability of the continuous mosquito coil. The binder is blended as an adhesive for binding and fixing the raw materials. The combustion improver, the extender and the binder become the base material of the continuous linear mosquito-repellent incense. Examples of suitable combustion improvers include: wood flour, pyrethrum extract residue powder, citrus peel powder, tea powder, coconut shell powder, etc. These combustion improvers may be used alone or as a mixture of two or more. Examples of suitable extenders include: diatomaceous earth, talc, clay, kaolin, and the like. These extenders may be used alone or as a mixture of two or more. Examples of suitable binders include: taber powder (Japanese: タブ powder), starch (alpha starch, tapioca starch, etc.), methyl cellulose, carboxymethyl cellulose (CMC), etc. These binders may be used alone or as a mixture of two or more. The carbide base material, the combustion improver, the extender and the binder are base materials of the persistent linear mosquito coil, and the content of the base material is preferably 90 wt% or more relative to the weight of the entire persistent linear mosquito coil.
Mosquito coil incense is generally given a smell suitable for a coil, but recently, various perfume components having volatility are sometimes added for the purpose of obtaining a fragrance effect or a relaxation effect. The persistent mosquito coil of the present invention can suppress odor or irritation due to smoke or the like at the time of combustion and can sustain the insecticidal effect for a long time regardless of the presence or absence of the addition of the perfume component, but various perfume components may be added to the persistent mosquito coil of the present invention for the purpose of obtaining a fragrance effect or a relaxation effect. Examples of the perfume components include: galaxolide (galaxolide), ketomusk, hexyl cinnamaldehyde, ambroxone, methyl dihydrojasmonate, ethylene brassylate (ethylene brassylate), geraniol, synthetic oak moss (Japanese: メチルァトラレート), hexyl salicylate (hexyl salicylate), tricyclodecenyl acetate (tricyclodecenyl acetate), citrine (Japanese: オレンジヤークリスタル), ambroxol (ambroxan), musk Tonalide (Tonalide) (6-acetyl-1, 1, 2, 4, 4, 7-hexamethyltetralin), gamma undecalactone, kefir (Japanese: キヤシユメラン), watermelon ketone (Calone), piperonal (heliotropin), indanyl-2, 4-dioxane, alpha-isomethyl ionone (ionone), indole, methyl cedrone (Japanese: メチルセドリルケトン), methyl beta-naphthyl ketone (methyl beta-naphthyl ketone), Crystalline rose (rosephenone), coumarin (coumarins), vanillin (vanillin), styrax resinoid (styrax resinoid), benzyl benzoate, undecyl aldehyde, benzyl salicylate, ionone (ionone), alpha-ionone (ionone), beta-ionone (ionone), lilial (lily aldehyde), 3, 5-dinitro-2, 6-dimethyl-4-t-butylacetophenone, acecedrene, 2-cyclohexylidene-2-phenylacetaldehyde, isolongifolanone (isolingifloanone), and cis-3-hexenol, and the like. These perfume ingredients may be used alone or as a mixture of two or more. The content of the perfume component is preferably 0.001 to 5 wt%, more preferably 0.01 to 1 wt%, based on the weight of the whole persistent mosquito coil. If the content of the perfume component is less than 0.001 wt%, sufficient fragrance may not be generated. If the content of the perfume component exceeds 5 wt%, the odor or irritation may be excessively increased.
The persistent mosquito coil of the present invention may contain, as other components, a fungicide, a preservative, a stabilizer, an efficacy enhancer, a deodorant, and the like. Examples of the antifungal agent and the preservative include: dehydroacetates, sorbates, p-hydroxybenzoates, and the like. Examples of the stabilizer include: 2, 6-di-tert-butyl-4-methylphenol (BHT), 2 ' -methylenebis (4-methyl-6-tert-butylphenol), 2 ' -methylenebis (4-ethyl-6-tert-butylphenol), 4 ' -butylidenebis (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-methylphenylacrylate, 2, 4-di-tert-butylphenyl 3, 5-di-tert-butyl-4-hydroxybenzoate and the like. By adding such a stabilizer, not only the stability of the insecticidal component during storage over time is enhanced, but also the stability during fumigation is enhanced, and further, the effect persistence of the effective component after volatilization can be improved. The amount of the stabilizer added is preferably 0.01 to 0.5 times the amount of the pesticidal component. Examples of the efficacy enhancers include: piperonyl butoxide (piperonyl butoxide), N- (2-ethylhexyl) -bicyclo [2, 2, 1] hept-5-ene-2, 3-dicarboximide, and the like. Furthermore, the persistent mosquito coil may contain a coloring agent such as malachite green (malachite green) or a dietary supplement (e.g., edible blue No. 1, edible yellow No. 4, edible red No. 106).
[ time of combustion ]
Conventional mosquito coils control mosquitoes by fumigating during combustion to volatilize insecticidal components, but sometimes smoke is avoided during use such as at bedtime. Since the persistent mosquito coil of the present invention has the insecticidal effect sustained by allowing the insecticidal component to remain in the air even after a long time has elapsed after the burning, the use friendliness can be improved by setting the burning time to an appropriate range. The burning time of the persistent mosquito coil of the present invention from ignition to burnout is preferably within 30 minutes. By setting the burning time to be within 30 minutes, mosquitoes can be prevented and removed for a long time during bedtime, and the burning of the continuous linear mosquito-repellent incense can be completed in a short time before or immediately after bedtime, so that there is no fear of worrying about the safe bedtime such as smoke. The duration of the insecticidal effect (the time during which mosquitoes can be controlled) after the burning of the continuous linear mosquito coil 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 8 hours or more, for example, when used at night, a person can sleep comfortably without being bitten by mosquitoes all night. Further, if the burning time is set to 30 minutes or less and the duration of the insecticidal effect after burning is set to 8 hours, the continuous mosquito coil is extinguished when a person falls asleep, and therefore, the mosquito killer can be used safely even at night without fear of a fire. In this way, the persistent mosquito coil of the present invention is suitable for indoor use, particularly for use in a highly airtight space, because the insecticidal effect is sustained for a long time, although the burning time is short. However, the continuous mosquito coil of the present invention may be used outdoors.
[ amount of volatilization of insecticidal component per unit time ]
The persistent mosquito coil of the present invention is designed to allow a sufficient amount of insecticidal components to be volatilized into the air even in a short-time combustion by setting the volatilization amount of the insecticidal components per unit time during combustion within an appropriate range. Here, the volatilization amount of the insecticidal component when the persistent mosquito coil is completely burned is calculated as follows: the persistent mosquito coil was completely burned in an exhaust bell connected to a glass tube containing silica gel, air in the exhaust bell was sucked by a pump to trap the insecticidal components volatilized by the combustion, and the trapped insecticidal components were analyzed by gas chromatography. The amount of the insecticidal component volatilized per unit time obtained by dividing the amount of the insecticidal component volatilized by the combustion time is preferably 0.05 to 15 mg/min, more preferably 0.1 to 10 mg/min. When the amount of the insecticidal component volatilized per unit time is within the above range, an appropriate amount of the insecticidal component can be volatilized into the air even when the combustion is performed for a short time of 30 minutes or less. Further, when the amount of the insecticidal component volatilized per unit time is in the above range, even if the iodine adsorption capacity of the carbide base material is 200mg/g or less, odor or irritation due to smoke or the like at the time of combustion can be reduced. If the amount of the insecticidal component volatilized per unit time is less than 0.05 mg/min, a sufficient amount of the insecticidal component may not be volatilized into the air and the insecticidal effect may not be sustained if the combustion is performed for a short time of 30 minutes or less. If the amount of the insecticidal component volatilized per unit time exceeds 15 mg/min, there is a possibility that the odor or irritation of smoke due to smoke or the like during combustion cannot be sufficiently alleviated. In addition, since the insecticidal component is not a component contributing to direct combustion, there is a possibility that continuous linear mosquito coils are extinguished.
[ insecticidal component maintenance Rate ]
In the persistent mosquito coil of the present invention, the amount of the insecticidal component added is CI(mg) when the volatile amount of the insecticidal component after complete combustion is V (mg), the volatile amount of the insecticidal component V and the blending amount of the insecticidal component CIThe ratio of (a), i.e., the insecticidal component maintenance ratio preferably satisfies the following formula (1).
Insecticidal component maintenance rate ═ (V/C)I)×100≥40…(1)
By satisfying the condition of the formula (1), since the insecticidal component is not excessively decomposed during storage and burning of the persistent linear mosquito coil, it is possible to suppress the amount of the insecticidal component to be mixed during production and to volatilize a sufficient amount of the insecticidal component into the air during burning. If the holding ratio of the insecticidal component is less than 40%, the amount of the insecticidal component required for continuous production of linear mosquito coils may increase, which is economically disadvantageous. Further, since the insecticidal component is not a component contributing to direct combustion, there is a possibility that extinguishing of the continuous mosquito coil may occur by increasing the amount of the insecticidal component to be blended.
[ insecticidal component/adsorptive capacity ratio ]
In the on-line mosquito incense, the mixing amount of the insecticidal component is set as CI(mg) the amount of the carbide base material added is CB(g) The amount of the carbide base material C is defined as A (mg/g) in terms of the iodine adsorption capacity of the carbide base materialBThe product of the iodine adsorption capacity A of the carbide substrate represents the total amount of iodine adsorption of the whole persistent linear mosquito-repellent incense. Here, the amount of C added to the carbide base materialBThe amount C of the insecticidal component multiplied by the iodine adsorption capacity A of the carbide substrateIThe ratio of (A) to (B) is the ratio of the insecticidal component to the adsorption capacity, and affects the amount of the insecticidal component volatilized. In the persistent mosquito coil of the present invention, the insecticidal component/adsorption capacity ratio preferably satisfies the following formula (2).
Insecticidal component/adsorptive capacity ratio ═ CI/(CB×A)≥3×10-2…(2)
By satisfying the formula (2), the persistent mosquito coil is carbonized during storage and burning thereof with respect to the amount of the insecticidal component to be mixed during productionThe ratio of the insecticidal component decomposed by the iodine adsorption ability of the base material is sufficiently small. Therefore, even if a part of the insecticidal component is decomposed during storage and burning of the persistent mosquito coil, an appropriate amount of the insecticidal component can be volatilized after burning so that the insecticidal effect can be sustained for a long time. The ratio of insecticidal component to adsorbability is less than 3 × 10-2In the case of the continuous linear mosquito coil, the proportion of the insecticidal component decomposed by the iodine adsorption ability of the carbide base material during storage and combustion may become large relative to the amount of the insecticidal component added during production, and the insecticidal component volatilized during combustion may be insufficient.
[ controlling target pests ]
The persistent mosquito coil of the present invention is not particularly limited to pests to be controlled, and examples thereof include: the insecticidal composition is effective against stoichthyes lilacinus, culex tritaenioides, culex fatigues, culex infested, aedes aegypti such as aedes aegypti and aedes albopictus, flying pests such as flying mosquitoes, house flies, moth flies, flea flies, membrane wings, gadflies, gnats, midges, and clothoids, and stoloniferous pests such as cockroaches such as german cockroach, american cockroach, black chest cockroach, mites, ants, bed bugs, psophiles, dead bugs, weevils, and the like, and particularly against mosquitoes and aedes.
Examples
[ example 1]
Charcoal powder a (50 parts by weight) having an iodine adsorption capacity of 25mg/g as a carbide base material, metofluthrin (1.5 parts by weight) as an insecticidal component, a mixed flavor (0.8 part by weight) containing galaxolide and musk ketone as flavor components, pyrethrum extract residue powder (17 parts by weight) as a plant powder as a combustion improver/extender, wood powder (10.7 parts by weight) and diatomaceous earth (3 parts by weight), and α starch (14 parts by weight) as a binder and carboxymethyl cellulose (CMC) (3 parts by weight) were mixed, and water (90 parts by weight) was added thereto and sufficiently kneaded. The kneaded mixture was molded into a rod-like shape by an extruder, and then dried until the water content became about 7 to 10 wt%, thereby producing a persistent mosquito coil of example 1. The persistent mosquito coil of example 1 has an insecticidal component/adsorbability ratio of 1.2 and satisfies the condition of the above formula (2).
The persistent mosquito coil of example 1 was placed in a 10-roll room (area 16.7 m)2Height 2.5m, volume 41.7m3) When used, the fuel is burnt out in about 23 minutes, but various pests such as mosquitoes are not close to each other in 12 hours after burning. It is thus assumed that: after burning the persistent mosquito coil of example 1, the insecticidal component remained sufficiently in the room for 12 hours. In addition, the persistent mosquito coil of example 1 produced a small amount of smoke during burning, did not feel irritating odor, and produced a light floral odor. The fragrance can provide relaxation feeling, and is suitable for use in bedroom.
[ examples 2 to 12 ]
A continuous mosquito coil of the present invention was produced in accordance with example 1, using charcoal powder A having an iodine adsorption capacity of 25mg/g as a carbide substrate and charcoal powder B having an iodine adsorption capacity of 838mg/g in the formulation shown in Table 1 (examples 2 to 12). The persistent mosquito coil of examples 2 to 12 had a ratio of insecticidal component/adsorbability of 3.1X 10-22.2, all satisfying the condition of the above formula (2).
[ comparative examples 1 to 3]
A continuous mosquito coil not having the characteristic structure of the present invention was produced in accordance with example 1 using charcoal powder A having an iodine adsorption capacity of 25mg/g and/or charcoal powder B having an iodine adsorption capacity of 838mg/g as carbide substrates in the formulation shown in Table 2 (comparative examples 1 to 3). The persistent mosquito coils of comparative examples 1 to 3 are examples in which the iodine adsorption capacity of the carbide substrate is larger than that of the present invention, and the insecticidal component/adsorption capacity ratio is 7.2X 10-3～2.2×10-2Are all smaller than the condition of the above formula (2).
[ reference example ]
A persistent mosquito coil (reference example) was produced in accordance with example 1, without using a carbide substrate having iodine adsorption ability, with the formulation shown in Table 2.
Each of the following tests (1) to (4) was carried out using the persistent mosquito coils of examples 1 to 12, comparative examples 1 to 3 and reference example.
(1) Stability over time
The insecticidal component contained in the persistent linear mosquito coil after being stored at 50 ℃ for 1 month was analyzed by gas chromatography, and the recovery rate of the insecticidal component was calculated from the content of the insecticidal component after being stored for 1 month and the blending amount of the insecticidal component at the time of production. The stability over time was determined according to the following criteria.
A: the recovery rate of the insecticidal components is more than 95 percent
B: the recovery rate of the insecticidal components is more than 90 percent and less than 95 percent
C: the recovery rate of the insecticidal components is less than 90 percent
(2) Retention rate of insecticidal component
The persistent mosquito coil was completely burned in an exhaust bell connected to a glass tube containing silica gel, air in the exhaust bell was sucked by a pump to collect the insecticidal components volatilized by the combustion, and the collected insecticidal components were analyzed by gas chromatography to calculate the volatilization amount of the insecticidal components when the persistent mosquito coil was completely burned. Then, the insecticidal component maintenance ratio is calculated from the calculated volatilization amount and the blending amount of the insecticidal component at the time of production, based on the above formula (1).
(3) Preference of
The continuous linear mosquito coil was burned in a glass cylinder having a diameter of 20cm and a height of 40cm, and the preference of 10 testers for the irritation alleviation property and the flavor was evaluated with the highest point as 10 and the lowest point as 1. As a result of the test based on the preference of the functionality test, the average value of the evaluation points of the test persons who passed 10 persons was calculated.
(4) In-situ insecticidal efficacy test
At the closed 25m3In the center of the room, the continuous mosquito coil is burnt. Spontaneous combustionAfter 8 hours of burning, 50 female culex pipiens pallens adults were placed and exposed for 2 hours, and all the mosquitoes to be tested were recovered. Meanwhile, with the lapse of time, female culex pipiens pallens which fell and turned upside down were counted, and the time point at which 25 female culex pipiens pallens fell and turned upside down was KT50Values (rounded below the decimal point).
[ Table 3]
In the persistent linear mosquito coils of examples 1 to 12, which contained metofluthrin, proffluthrin or transfluthrin as an insecticidal component and contained a carbide base material having an iodine adsorption capacity of 200mg/g or less, it was confirmed that: has excellent stability with time, has an insecticidal component maintenance rate of 40% or more, and can burn for a short time of 30 minutes or less, but KT after burning for 12 hours from spontaneous combustion50The value is 30 minutes or less, and the excellent insecticidal effect is continuously obtained. It is considered that the persistent mosquito coils of examples 1 to 12 obtained the same or higher stability with time and insecticidal effect after 12 hours of spontaneous combustion as the reference example in which the carbide base having iodine adsorption ability was not blended, and therefore, by suppressing the iodine adsorption ability of the carbide base to 200mg/g or less, excessive decomposition of the insecticidal component by the carbide base did not occur.
While the persistent mosquito coils of the reference examples were satisfactory in terms of smoke odor and a large smoke amount, the persistent mosquito coils of examples 1 to 12 were easy to use in practical use, which had excellent irritation alleviation properties and odor preference, without being excessively filled with smoke, and without causing a floating fragrance after combustion. It is thus assumed that: the persistent mosquito coils of examples 1 to 12 had iodine adsorption capacity of 200mg/g or less on the carbide base, but still had sufficient effect of reducing odor and irritation caused by smoke and the like during burning.
In the persistent mosquito coils of examples 1 to 12, the effect of the mosquito coil was slightly reduced when the amount of the insecticidal component volatilized per unit time was low (examples 4 to 6 and 8). In example 3 in which the amount of volatile matter per unit time was excessively large at 10.2 mg/min, the combustion of the persistent mosquito coil could not be continued until the end. Therefore, the amount of the insecticidal component volatilized per unit time is preferably 0.05 to 15 mg/min, more preferably 0.1 to 10 mg/min.
In comparison with example 1, in example 9, although the amounts of the insecticidal component and the carbide base material were the same and the types of the perfume components were different, the retention rate of the insecticidal component and the KT50 value 12 hours after spontaneous combustion did not differ much. In comparison between example 10 and example 1, the amounts of the insecticidal component and the carbide base material were the same, and the insecticidal component retention rate and KT 12 hours after spontaneous combustion were different from each other in the point that no perfume component was added50The values do not differ much. It is thus assumed that: the kind and amount of the perfume component do not significantly affect the decomposition of the insecticidal component due to the iodine adsorption ability of the carbide base material.
On the other hand, as in comparative examples 1 to 3, when metafluthrin was contained as the insecticidal component, but when the carbide base material having an iodine adsorption capacity of more than 200mg/g was contained, the stability of the insecticidal component with time was insufficient, the insecticidal component maintenance rate was less than 40%, and KT 12 hours after spontaneous combustion was achieved50The value also reaches 120 minutes or more, and a sufficient insecticidal effect cannot be obtained. The reason is considered to be that: since the iodine adsorption capacity of the carbide base material exceeds 200mg/g, excessive decomposition of the insecticidal component by the carbide base material is generated. In addition, the persistent mosquito coils of comparative examples 1 to 3 were difficult to perceive the fragrance due to the perfume components, and the scent was perceived to deteriorate (Japanese style of cooking).
Industrial applicability
The persistent mosquito coil of the present invention can be used for the purpose of preventing and killing pests as a mosquito coil for domestic use or business use, and is particularly suitable for use in mosquitoes such as culex pipiens pallens, culex infested, aedes albopictus, and the like.
Claims (6)
1. A persistent mosquito coil whose insecticidal effect is persistent even after burning, comprising:
an insecticidal component selected from at least one of the group consisting of metofluthrin, proffluthrin and transfluthrin; and
a carbide substrate having an iodine adsorption capacity of 200mg/g or less.
2. The persistent mosquito coil according to claim 1, wherein the volatilization amount of the insecticidal component per unit time at the time of burning is set to 0.05 mg/min to 15 mg/min.
3. The continuous string mosquito coil according to claim 1 or 2, wherein the burning time is set to be within 30 minutes.
4. The persistent mosquito coil according to any one of claims 1 to 3, wherein the duration of the insecticidal effect after burning is set to 8 hours or more.
5. The persistent mosquito coil according to any one of claims 1 to 4, wherein the amount of the insecticidal component added is CIWherein the volatilization amount of the insecticidal component after complete combustion is set to V so as to satisfy the following formula (1), CIAnd the units of V are both in mg,
(V/CI)×100≥40…(1)。
6. the persistent mosquito coil according to any one of claims 1 to 5, wherein the amount of the insecticidal component added is CIC represents the amount of the carbide base materialBWherein the iodine adsorption capacity of the carbide base material is A, the following formula (2) is satisfied, and C isIIn mg, CBIn units of g, said units of A are mg/g,
CI/(CB×A)≥3×10-2…(2)。
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| CN1430889A (en) * | 2002-11-20 | 2003-07-23 | 庄占军 | Quick flaming mosquito-repellent incense |
| JP2008013547A (en) * | 2006-06-07 | 2008-01-24 | Earth Chem Corp Ltd | Mosquito-repellent incense and method for stabilizing chemical in mosquito-repellent incense |
| CN101946806A (en) * | 2010-01-18 | 2011-01-19 | 中山榄菊日化实业有限公司 | Combustion mosquito coil incense and preparation method thereof |
| JP2011012056A (en) * | 2009-06-02 | 2011-01-20 | Dainippon Jochugiku Co Ltd | Method for controlling insect pest |
| WO2019112416A1 (en) * | 2017-12-06 | 2019-06-13 | Sumitomo Chemical Enviro-Agro Asia Pacific Sdn. Bhd. | Mosquito repellent composition |
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| JP4368904B2 (en) * | 2006-11-08 | 2009-11-18 | 大日本除蟲菊株式会社 | Incense base material |
| JP6247540B2 (en) | 2013-01-11 | 2017-12-13 | 大日本除蟲菊株式会社 | Mosquito coil |
| JP6663174B2 (en) | 2015-06-08 | 2020-03-11 | 大日本除蟲菊株式会社 | Pharmaceutical compositions, pest control incense sticks, and preparations for heat evaporation |
| JP6526915B2 (en) * | 2016-06-06 | 2019-06-05 | 三和インセクティサイド株式会社 | Mosquito control agent and mosquito control method |
| JP7095983B2 (en) | 2017-12-11 | 2022-07-05 | アース製薬株式会社 | Mosquito coil |
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| CN1430889A (en) * | 2002-11-20 | 2003-07-23 | 庄占军 | Quick flaming mosquito-repellent incense |
| JP2008013547A (en) * | 2006-06-07 | 2008-01-24 | Earth Chem Corp Ltd | Mosquito-repellent incense and method for stabilizing chemical in mosquito-repellent incense |
| JP2011012056A (en) * | 2009-06-02 | 2011-01-20 | Dainippon Jochugiku Co Ltd | Method for controlling insect pest |
| CN101946806A (en) * | 2010-01-18 | 2011-01-19 | 中山榄菊日化实业有限公司 | Combustion mosquito coil incense and preparation method thereof |
| WO2019112416A1 (en) * | 2017-12-06 | 2019-06-13 | Sumitomo Chemical Enviro-Agro Asia Pacific Sdn. Bhd. | Mosquito repellent composition |
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| JP2023052422A (en) | 2023-04-11 |
| JP2022079611A (en) | 2022-05-26 |
| JPWO2021002229A1 (en) | 2021-12-16 |
| CN117099796A (en) | 2023-11-24 |
| TWI746030B (en) | 2021-11-11 |
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