Composition for insect pest control and method for insect pest control

Abstract

Provided is a composition for insect pest control containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier. The pest control composition has a ratio (V4 / V1) of a natural pyrethrin transpiration rate V4 (mg / hour) after heating at 180°C for 4 hours to a natural pyrethrin transpiration rate V1 (mg / hour) after heating at 180°C for 1 hour of 0.2-1.5.

Description

Pest control composition and pest control method

[0001] The present invention relates to a pest control composition and a pest control method. This patent application claims priority and benefits under the Paris Convention based on Japanese Patent Application No. 2024-230252 (filed on December 26, 2024) and Japanese Patent Application No. 2025-151993 (filed on September 12, 2025), and by incorporating the entire content described in the above applications herein by reference, the same shall be incorporated into this specification.

[0002] Due to the increasing natural orientation of consumers, natural pyrethrins have attracted attention (for example, Patent Document 1). Natural pyrethrins are suitably used for pest control and the like, but due to the instability of their chemical structure, the pest control effect may decrease over time or when exposed to high temperatures.

[0003] International Publication No. 2022 / 220294

[0004] An object of the present invention is to provide a pest control composition and a pest control method having an excellent pest control effect.

[0005] As a result of investigations to find a pest control composition having an excellent pest control effect, the present inventor has found a pest control composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier, wherein the ratio (V4 / V1) of the natural pyrethrin evaporation rate V4 (mg / hour) after heating at 180°C for 4 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 180°C for 1 hour is 0.2 to 1.5, and the composition is excellent in pest control effect and usability.

[0006] The present invention includes the following [1] to [7]. [1] A pest control composition comprising natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier, wherein the ratio (V4 / V1) of the natural pyrethrin evaporation rate V4 (mg / hour) after heating at 180°C for 4 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 180°C for 1 hour is 0.2 to 1.5 (hereinafter sometimes referred to as the present invention composition). [2] The pest control composition according to [1], wherein the radical chain inhibitor comprises at least one selected from the group consisting of dibutylhydroxytoluene, butylhydroxyanisole, and piperonib toxide. [3] The pest control composition according to [1] or [2], wherein the peroxide decomposing agent comprises at least one selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, triisodecyl phosphite, and tris(nonylphenyl) phosphite. [4] The pest control composition according to [1] or [2], wherein the peroxide decomposing agent comprises at least one selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite. [5] The pest control composition according to any one of [1] to [4], wherein the mass ratio of the radical chain inhibitor to the peroxide decomposing agent is 1:0.25 to 1:15. [6] The pest control composition according to any one of [1] to [5], which is a pest control mat. [7] A method for controlling pests, comprising the step of evaporating natural pyrethrin into the air at a evaporation rate of 2 mg / hour to 100 mg / hour for a period of 4 hours.

[0007] The pest control composition and pest control method of the present invention have excellent pest control effects.

[0008] Figure 1 is a perspective view of a heat vaporization type insecticide device that uses an insect control mat.

[0009] The composition of the present invention comprises a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier.

[0010] <Natural Pyrethrins> The natural pyrethrins used in this invention contain six compounds as active ingredients: pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmoline I, and jasmoline II. Natural pyrethrins can typically be obtained as an extract or dried pyrethrin powder, obtained by extracting the active ingredients from a powder made by collecting, drying, and grinding only the calyx of the flower of chrysanthemum (Tanacetum cinerariifolium or Chrysanthemum cinerariaefolium) using a suitable solvent (also called a solvent), such as an organic solvent like methanol. In addition to the six compounds mentioned above, natural pyrethrins may also contain plant-derived impurities (such as fatty acids and flavonoids).In addition to the aforementioned Chrysanthemum cinerariaefolium, other plants from which natural pyrethrins can be obtained include Calendula officinalis, Chrysanthemum coccinum, Tagetes erecta, Tagetes minuta, Zinnia elegans, and Zinnia linnearis (References 1: Adnane. H. Alain, C. & Chantal, B. 2000. The Production of Pyrethrins by Plant Cell and Tissue Cultures of Chrysanthemum cinerariaefolium and Tagetes Species. Critical Reviews in Plant Sciences, 19(1):69-89; Reference 2: Kudakasseril, GJ and Staba, EJ 1988. Insecticidal phytochemicals. In: Cell Culture and Somatic Cell Genetics of Plants. pp. 537-552. Constabel, F. and Vasil, IK, Eds., Academic Press, New York, Reference 3: John E. Casida, Gary B. Quistad. 1995. PYRETHRUM FLOWERS, Production, Chemistry, Toxicology, and Uses. pp. 123-125, Oxford University Press.).

[0011] The plant species and varieties that serve as the source of natural pyrethrins used in this invention are not limited to those mentioned above. The cultivation methods, cultivation conditions (weather, origin, soil type, etc.), harvest time, harvest part, harvesting method, washing method, extraction method, and purification method of the plants are not particularly limited. Natural pyrethrins used in this invention also include, for example, natural pyrethrins obtained using a vector into which a gene encoding a pyrethrin biosynthesis enzyme is incorporated.

[0012] The mass ratios of the six compounds used in the natural pyrethrins of the present invention—pyrethrin I, pyrethrin II, synerin I, synerin II, jasmolin I, and jasmolin II—are not particularly limited. Any mass ratio can be set for each compound in the range of 0.001 to 99% by mass relative to the total amount of natural pyrethrins. Typically, however, the natural pyrethrins are contained in the following mass ratios: pyrethrin I at 10 to 70% by mass, pyrethrin II at 10 to 70% by mass, synerin I at 1 to 20% by mass, synerin II at 1 to 20% by mass, jasmolin I at 1 to 20% by mass, and jasmolin II at 1 to 20% by mass, relative to the total amount of natural pyrethrins. As a specific example of a mixing ratio (mass ratio), [Pyrethrin I: Synerin I: Jasmolin I: Pyrethrin II: Synerin II: Jasmolin II] = 38.0:7.3:4.0:35.0:11.7:4.0 (Reference 3).

[0013] Examples of natural pyrethrins used in the present invention include pyrethrin I (total amount of pyrethrin I, synerin I, and jasmolin I) and pyrethrin II (total amount of pyrethrin II, synerin II, and jasmolin II), with pyrethrin I at 20 to 40% by mass and pyrethrin II at 12 to 31% by mass relative to the total amount of natural pyrethrin. The total amount of pyrethrin I and pyrethrin II in the natural pyrethrin is usually 10 to 99% by mass, preferably 15 to 90% by mass, and more preferably 20 to 85% by mass, relative to the total amount of natural pyrethrin.

[0014] The content of natural pyrethrin in the composition of the present invention is preferably 1 to 30% by mass, more preferably 1 to 20% by mass, and even more preferably 3 to 15% by mass, relative to the total amount of the composition of the present invention. Specific examples of natural pyrethrin content include 1% by mass, 1.5% by mass, 2% by mass, 2.5% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, 20% by mass, 21% by mass, 22% by mass, 23% by mass, 24% by mass, 25% by mass, 26% by mass, 27% by mass, 28% by mass, 29% by mass, and 30% by mass. These content can also be expressed as "approximately". "Approximately" means plus or minus 10%, so for example, "approximately 1 mass%" means between 0.9 mass% and 1.1 mass%.

[0015] <Radical Chain Inhibitors> The radical chain inhibitors used in the present invention will now be described. In the present invention, a radical chain inhibitor means a compound that reacts with free radicals to produce stable molecules, thereby stopping chain reactions caused by free radicals. Examples of radical chain inhibitors include dibutylhydroxytoluene (hereinafter sometimes abbreviated as BHT), butylhydroxyanisole (hereinafter sometimes abbreviated as BHA), and piperonib toxide (hereinafter sometimes abbreviated as PBO). Among these, BHT and PBO are preferred. Multiple radical chain inhibitors may be used in combination, and BHT and PBO can be suitably used in combination. BHT and BHA are commercially available, for example, from Kanto Chemical Co., Ltd. PBO is commercially available, for example, from Endura. The content of the radical chain inhibitor in the composition of the present invention is preferably 0.5 to 15% by mass, more preferably 1 to 10% by mass, and even more preferably 1 to 7% by mass, based on the total amount of the composition of the present invention. Specific radical chain inhibitor contentes include 0.5% by mass, 1% by mass, 1.5% by mass, 2% by mass, 2.5% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, and 15% by mass.

[0016] The mass ratio of natural pyrethrin to radical chain inhibitor contained in the composition of the present invention is preferably 1:0.067 to 1:20, more preferably 1:0.1 to 1:15, and even more preferably 1:0.1 to 1:3.3. Specific mass ratios include 1:0.07, 1:0.08, 1:0.09, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, and 1:20. These mass ratios can also be expressed as "approximately." "Approximately" means plus or minus 10%, so for example, "approximately 1:2" means between 1:1.8 and 1:2.2.

[0017] <Peroxide Decomposing Agents> The peroxide decomposing agents used in the present invention will now be described. In the present invention, a peroxide decomposing agent means a compound that has the effect of decomposing peroxides and converting them into more stable compounds. Peroxide inhibitors include phosphorus-based antioxidants and sulfur-based antioxidants. Phosphorus-based antioxidants can be suitably used as peroxide decomposing agents. Furthermore, phosphorus-based antioxidants having substituted phenyl groups can be suitably used as peroxide decomposing agents. In addition, multiple peroxide decomposing agents may be used in combination. Specific peroxide decomposing agents include, for example, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, triisodecyl phosphite, and tris(nonylphenyl) phosphite. Among these, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite are preferred. 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) (CAS registration number: 13003-12-8) is commercially available, for example, as JPH-1200 (manufactured by Johoku Chemical Industry Co., Ltd.). 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol (CAS registration number: 203255-81-6) is commercially available, for example, as SUMILIZER® GP (manufactured by Sumitomo Chemical Co., Ltd.).Tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite (CAS registration number: 96152-48-6) is commercially available, for example, as Adeka Stab 1500 (manufactured by ADEKA). Triisodecyl phosphite (CAS registration number: 25448-25-3) is commercially available, for example, as Adeka Stab 3010 (manufactured by ADEKA). Tris(nonylphenyl)phosphite (CAS registration number: 26523-78-4) is commercially available, for example, as Nocrac TNP (manufactured by Ouchi Shinko Chemical Industry Co., Ltd.). The content of the peroxide decomposing agent contained in the composition of the present invention is preferably 1 to 20% by mass, more preferably 1 to 15% by mass, and even more preferably 2 to 10% by mass, based on the total amount of the composition of the present invention. Specific peroxide decomposing agent content can be found to be 1% by mass, 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, and 20% by mass.

[0018] The mass ratio of natural pyrethrin to peroxide decomposing agent contained in the composition of the present invention is preferably 1:0.17 to 1:30, more preferably 1:0.25 to 1:20, and even more preferably 1:0.33 to 1:3.3. Specific mass ratios include 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:20, 1:25, and 1:30.

[0019] The mass ratio of the radical chain inhibitor to the peroxide decomposing agent contained in the composition of the present invention is preferably 1:0.25 to 1:15, more preferably 1:0.33 to 1:10, and even more preferably 1:0.5 to 1:8. Specific ratios include 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, and 1:15.

[0020] <Solid Carriers> The solid carriers used in the present invention will now be described. In this specification, the solid carriers are not particularly limited as long as they do not impair the effects of the present invention, but examples of solid carriers include the following: Inorganic materials: Minerals (natural silicates, marble, pumice, limestone, rare earth minerals, cryolite, activated clay, lime, activated carbon, talc, attapulgite, sodium montmorillonite, calcium montmorillonite, kaolinite, calcite, dolomite, diatomite, bentonite, zeolite, sepiolite, pyrophyllite, vermiculite, crystalline silica, amorphous silica, etc.), silicon dioxide, calcium sulfate, magnesium sulfate, barium sulfate, magnesium oxide, aluminum oxide, ammonium sulfate, ammonium phosphate, ammonium nitrate, calcium phosphate, sulfur, calcium carbonate, sodium bicarbonate, sodium carbonate, synthetic silicates, and pulverized products thereof; Organic materials: grain powders (rice bran, rice flour, corn flour, wheat flour, etc.), sugars (cellulose, starch, lactose, glucose, fructose, sucrose, etc.), plant-derived powders (nut shell powders (coconut, walnut, peanut, etc.), tree-derived powders (bark powder, sawdust, etc.), other plant powders (tobacco stems, soybeans, cottonseed husks, etc.)), lignin, wax, seashells, urea, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, polyester, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, polyvinylpyrrolidone-methacrylic acid copolymer, polyvinylpyrrolidone-vinyl acetate copolymer, cellulose derivatives, phenolic resins, melamine resins, epoxy resins. The above solid carriers may also be used as adsorbent carriers.

[0021] In one embodiment of the present invention, the solid carrier may be one or more solid carriers selected from the group consisting of minerals, silicon dioxide, calcium sulfate, magnesium sulfate, barium sulfate, magnesium oxide, aluminum oxide, ammonium sulfate, ammonium phosphate, ammonium nitrate, calcium phosphate, sulfur, calcium carbonate, sodium bicarbonate, sodium carbonate, synthetic silicates, grain powders, sugars, plant-derived powders, tree-derived powders, other plant pulverized materials, lignin, wax, seashells, urea, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, polyester, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, polyvinylpyrrolidone-methacrylic acid copolymer, polyvinylpyrrolidone-vinyl acetate copolymer, cellulose derivatives, phenolic resins, melamine resins, and epoxy resins.

[0022] In another embodiment of the present invention, the composition of the present invention is used as a pest control mat described later. In this case, for example, a blank mat material composed of a fibrous carrier or a porous carrier may be included in the solid carrier. Examples of such fibrous carriers include natural fibers such as pulp, cotton linters, cellulose, and cotton, synthetic fibers such as polyester and acrylic, and inorganic fibers such as glass fibers and asbestos. Examples of porous carriers include inorganic powders such as clay, talc, kaolin, silica, calcite, diatomaceous earth, gypsum, perlite, bentonite, acid clay, glass fiber, or asbestos, which are bonded together with an adhesive such as carboxymethylcellulose, starch, gum arabic, gelatin, or polyvinyl alcohol and formed into a mat; or inorganic substances such as clay, talc, bentonite, alumina, silica, or calcite are solidified into a mat and fired; resin is molded and processed into a mat; or glass fibers are bundled into a mat. The blank mat material may appropriately contain pigments, preservatives, fragrances, etc. During the bonding of the inorganic powder and the adhesive, the various components described above or below can be mixed and molded into a mat, thereby retaining the various components. The solid carriers used in this invention are all known solid carriers, and each can be manufactured or obtained by following or in accordance with known methods, or by obtaining commercially available products.

[0023] The content of the solid carrier in the composition of the present invention is preferably 30 to 60% by mass, more preferably 35 to 55% by mass, and even more preferably 40 to 50% by mass, based on the total amount of the composition of the present invention. Specific solid carrier contents include 30%, 35%, 40%, 45%, 50%, 55%, and 60% by mass.

[0024] In one embodiment of the present invention, the mass ratio of natural pyrethrin to solid carrier is preferably 1:3 to 1:9, more preferably 1:4 to 1:8, and even more preferably 1:5 to 1:7.5. Specific mass ratios of natural pyrethrin to solid carrier include 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, and 1:9.

[0025] The composition of the present invention may also contain other formulation aids such as thickeners, surfactants, stabilizers, preservatives, or synergists, to the extent that they do not adversely affect the evaporation rate.

[0026] The composition of the present invention may contain other insecticidal active ingredients, solvents, dyes, stabilizers, fragrances, etc., as appropriate, to the extent that they do not adversely affect the evaporation rate of natural pyrethrins.

[0027] Examples of such solvents include ester-based solvents and hydrocarbon-based solvents. Specific examples of ester-based solvents include diisodecyl phthalate, di-2-ethylhexyl phthalate, diisopropyl adipate, diisobutyl adipate, diisodecyl adipate, di-n-octyl sebacate, diisononyl adipate, di-2-ethylhexyl sebacate, di-2-ethylhexyl azelate, di-n-hexyl azelate, di-2-ethylhexyl dodecanoate, dibutoxyethoxyethyl adipate, isopropyl palmitate, dioctyl adipate, di-n-butyl sebacate, acetyl tributyl citrate, di-2-ethylhexyl malate, isopropyl myristate, benzyl acetate, sucrose fatty acid esters, and sorbitan fatty acid esters. Examples of hydrocarbon-based solvents include n-paraffin-based solvents, isoparaffin-based solvents, and naphthenic solvents. Specific examples of n-paraffinic solvents include dodecane, tridecane, tetradecane, pentadecane, Norper 13 (trade name, manufactured by ExxonMobil Chemicals Ltd.), Norper 15 (trade name, manufactured by ExxonMobil Chemicals Ltd.), n-paraffin grade M (trade name, manufactured by Nippon Oil Corporation), n-paraffin grade H (trade name, manufactured by Nippon Oil Corporation), and Neothiosol (trade name, manufactured by Chuo Chemical Co., Ltd.). Specific examples of isoparaffinic solvents include Isopar M (trade name, manufactured by ExxonMobil), Isopar V (trade name, manufactured by ExxonMobil), IP Solvent 2028 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), IP Solvent 2835 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), and Shellsol™ (trade name, manufactured by Shell Chemicals Japan Co., Ltd.). Specific naphthenic solvents include, for example, Exol D80 (trade name, manufactured by ExxonMobil), Exol D110 (trade name, manufactured by ExxonMobil), and Exol D130 (trade name, manufactured by ExxonMobil). Kerosene can also be used. Other solvents include, for example, isopropanol, ethanol, propylene carbonate, 1,3-butylene glycol, polyoxyethylene hydrogenated castor oil, and olive oil.Among the solvents mentioned above, n-paraffinic solvents, isoparaffinic solvents, or naphthenic solvents can be suitably used. Two or more solvents may be used in combination, and solvents with different properties such as polarity can be combined. When solvents with different properties are used in combination in this way, one of them can be used as an auxiliary solvent. For example, when an n-paraffinic solvent, isoparaffinic solvent, or naphthenic solvent is used as the solvent, diisopropyl adipate or isopropyl myristate can be used as an auxiliary solvent. When the composition of the present invention contains a solvent, the solvent content (including the amount of auxiliary solvent if an auxiliary solvent is further included) is preferably 20 to 65% by mass, more preferably 25 to 55% by mass, and even more preferably 30 to 50% by mass, based on the total amount of the composition of the present invention. Specific solvent content examples include 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, and 65% by mass.

[0028] Examples of such dyes include anthraquinone-based blue dyes such as 1,4-dibutylaminoanthraquinone, 1,4-diisopropylaminoanthraquinone, 1,4-bis(2,6-diethyl-4-methylphenylamino)anthraquinone, 1-methylamino-4-orthotolylaminoanthraquinone, 1-methylamino-4-methatolylaminoanthraquinone, and 1-methylamino-4-paratolylaminoanthraquinone. These dyes may be used individually, in combination of two or more, or mixed with other dyes of different colors. Examples of such stabilizers include ultraviolet absorbers such as benzotriazole-based ultraviolet absorbers and benzophenone-based ultraviolet absorbers.

[0029] <Production of the Composition> In one embodiment, a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier can be produced by mixing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, other components selected as desired, and a solid carrier. In this case, the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired may be adsorbed onto the solid carrier to support the components. Alternatively, the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired may be impregnated into the solid carrier to support the components. In the above production method, the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired may be pre-mixed, or each component may be supported on the solid carrier simultaneously or separately without pre-mixing. In this case, it is preferable to pre-mix each component before supporting it on a solid carrier, and it is more preferable to pre-mix each component into a homogeneous solution before supporting it on a solid carrier. The methods and conditions for mixing and / or supporting each component on a solid carrier can be those of known methods and conditions.

[0030] In one embodiment of the present invention, the composition of the present invention comprises at least one radical chain inhibitor selected from the group consisting of natural pyrethrins, BHT, BHA, and PBO; 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, triisodecyl phosphite, and tris(nonylphenyl) phosphite; at least one solvent selected from the group consisting of n-paraffinic solvents, isoparaffinic solvents, and naphthenic solvents; and a matting material.

[0031] In one embodiment of the present invention, the composition comprises at least one radical chain inhibitor selected from the group consisting of natural pyrethrins, BHT, and PBO; at least one peroxide decomposer selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite; an isoparaffinic solvent; and a matting agent.

[0032] <Evaporation Rate> The composition of the present invention evaporates natural pyrethrin such that the ratio (V4 / V1) of the natural pyrethrin evaporation rate V4 (mg / hour) after heating at 180°C for 4 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 180°C for 1 hour is in the range of 0.2 to 1.5. By formulating a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposition agent, and a solid carrier, the evaporation rate of natural pyrethrin can be adjusted to a desired rate.

[0033] In this invention, the evaporation rate of natural pyrethrin after heating for X hours means the mass (mg / hour) of natural pyrethrin that evaporates per hour during a total heating time from X-1 hours to X hours. That is, for example, the evaporation rate of natural pyrethrin after heating for 4 hours means the mass (mg / hour) of natural pyrethrin that evaporates per hour during a total heating time from 3 hours to 4 hours. The evaporation rate after heating at 180°C for 4 hours is measured, for example, by the following method: A composition prepared using natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid support is heated on a ceramic heater at 180°C, and the mass (mg / hour) of natural pyrethrin that evaporates per hour between 3 and 4 hours after the start of heating is analyzed. The amount of natural pyrethrin evaporated (mg / hr) is determined by collecting the vapor of the evaporated natural pyrethrin in a urethane foam-packed column for a predetermined time, extracting it with acetone, and quantitatively analyzing the natural pyrethrin contained in the extract by high-performance liquid chromatography. The transpiration rate at other points in time can be measured in a similar manner.

[0034] In another embodiment of the present invention, the composition may evaporate natural pyrethrins at an evaporation rate of 2 mg / hour to 100 mg / hour for 6 hours by heating at 180°C. In yet another embodiment of the present invention, the composition may evaporate natural pyrethrins at an evaporation rate of 2 mg / hour to 100 mg / hour for 8 hours by heating at 180°C. In one embodiment of the present invention, the ratio (V4 / V1) of the natural pyrethrin evaporation rate V4 (mg / hour) after heating at 180°C for 4 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 180°C for 1 hour may be 0.2 to 1.5. Examples of specific ratios (V4 / V1) include 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, 1.1, 1.2, 1.3, 1.4, and 1.5.

[0035] One embodiment of the present invention is a composition comprising 1 to 30% by mass of natural pyrethrin, 0.5 to 15% by mass of a radical chain inhibitor, 1 to 20% by mass of a peroxide decomposer, 20 to 65% by mass of a solvent, and 30 to 60% by mass of a solid carrier, wherein the ratio (V4 / V1) of the natural pyrethrin evaporation rate V4 (mg / hour) after heating at 180°C for 4 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 180°C for 1 hour is 0.2 to 1.5. Another embodiment of the present invention comprises 1 to 30% by mass of a natural pyrethrin, 0.5 to 15% by mass of at least one radical chain inhibitor selected from the group consisting of BHT and PBO, and 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]prop A composition comprising 1 to 20% by mass of at least one peroxide decomposing agent selected from the group consisting of phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite, 20 to 65% by mass of an isoparaffinic solvent, and 30 to 60% by mass of a matting material, wherein natural pyrethrins are evaporated at an evaporation rate of 2 mg / hour to 100 mg / hour for 4 hours by heating at 180°C.

[0036] The composition of the present invention is preferably used as an insect control mat.

[0037] <Insect Control Mat and Formulation for Insect Control Mat> One embodiment of the present invention is an insect control mat containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier. The insect control mat may also be referred to as an electric mosquito repellent mat. In this specification, "formulation for insect control mat" means a composition for manufacturing an insect control mat containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components selected optionally, and a solid carrier. In this case, it is preferable that the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected optionally are supported on the solid carrier. As one embodiment of the present invention, an insect control mat according to the present invention can be manufactured by molding and processing a composition containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components selected optionally, and a solid carrier, which is an insect control mat formulation, into an insect control mat of a desired shape. Another embodiment of the present invention is an insect control mat in which the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other optionally selected components are impregnated or adsorbed into the blank mat material, where the solid carrier is a blank mat material composed of a fibrous carrier or a porous carrier.

[0038] One embodiment of the present invention is an insect control mat manufactured by molding and processing a formulation for insect control mats.

[0039] The size of the blank mat material, which is made of a fibrous or porous carrier and used in one embodiment of the present invention, is typically 2.0 to 4.0 cm² in apparent volume before impregnation or adsorption and retention of the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired. 3 (For example, 2.2 cm x 3.5 cm x 0.28 cm (approximately 2.2 cm) 3 ), 3.8cm x 4.8cm x 0.20cm (approximately 3.6cm 3 It could be within the range of (a certain degree).

[0040] In one embodiment of the present invention, the pest control mat includes the blank mat material 2.2 cm 3Around, the total amount of the above-mentioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected can usually be retained at 20 to 1600 mg. Another embodiment of the pest control mat of the present invention is a blank mat material having a size different from the apparent volume of the blank mat material exemplified above, and the above-mentioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected are impregnated or adsorbed and retained, and the blank mat material is 2.2 cm 3 Around, it can be produced by molding and processing into a desired size so that the total amount of the above-mentioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected is usually retained at 20 to 1600 mg.

[0041] Another embodiment of the pest control mat of the present invention is a pest control mat preparation containing the above-mentioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components optionally selected, and a solid carrier, and the pest control mat is 2.2 cm 3 Around, it can be produced by molding and processing the pest control mat so that the total amount of the above-mentioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected can usually be retained at 20 to 1600 mg. The method of impregnating or adsorbing and retaining the above-mentioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected on the blank mat material, and the method of molding and processing into a desired shape and size can each be implemented by applying known methods.

[0042] Furthermore, a method for molding and processing a pest control mat formulation containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components as desired, and a solid carrier into a desired pest control mat can be carried out by applying known methods. For example, such a pest control mat can be manufactured in a manner similar to that of a substrate used in an air treatment apparatus described in Japanese Patent Publication No. 2009-526056. Japanese Patent Publication No. 2009-526056 discloses a substrate having a pore network structure formed by adhering granular particles, in which air treatment chemicals such as natural pyrethrin can be supported within the pores. Such a substrate can be attached to an air treatment apparatus described in Japanese Patent Publication No. 2009-526056 and heated to release air treatment chemicals such as natural pyrethrin from the substrate. In other words, similar to the substrate of Japanese Patent Publication No. 2009-526056, a pest control mat can be manufactured by solidifying a formulation for pest control mats containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components selected as desired, and a solid carrier, and molding it into a predetermined shape. A pest control mat, which is one embodiment of the present invention, can appropriately contain other pest control active compounds, repellents, etc., which is expected to further improve its effectiveness.

[0043] One embodiment of the pest control mat is, for example, the pest control mat 11 used in a heat vaporization type insecticide device 200 as shown in Figure 1. In the heat vaporization type insecticide device 200 of Figure 1, the pest control mat 11 is placed on a hot plate 10, and by heating the hot plate to approximately 140 to 200°C, the natural pyrethrins and other substances held in the pest control mat are vaporized into the atmosphere, thereby controlling pests.

[0044] Further, the formulation for a pest control mat according to one embodiment of the present invention is a formulation capable of producing a pest control mat used in a heat-evaporation type insecticidal device described in, for example, Japanese Patent Application Laid-Open No. Hei 11-510055. In the heat-evaporation type insecticidal device described in Japanese Patent Application Laid-Open No. Hei 11-510055, fuel such as butane gas is burned to heat the pest control mat to about 120 to 200°C, and natural pyrethrin or the like held in the pest control mat is evaporated into the atmosphere, thereby controlling pests. That is, while the heat-evaporation type insecticidal device 200 shown in FIG. 1 heats the hot plate 10 by electric heating, the heat-evaporation type insecticidal device described in Japanese Patent Application Laid-Open No. Hei 11-510055 heats the hot plate in the device by burning fuel such as butane gas. Although there are differences in the heat source and heating temperature between the two, the principle of evaporating natural pyrethrin or the like held in the pest control mat into the atmosphere by heating is the same.

[0045] The formulation for a pest control mat according to one embodiment of the present invention is not limited to the device shown in FIG. 1, but can be applied to a heat-evaporation type insecticidal device using a conventionally known pest control mat by molding and processing it into the shape of a conventionally known pest control mat, and any of them can exhibit excellent effects.

[0046] In one embodiment of the present invention, the pest control mat contains natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a mat material as a solid carrier, and may further appropriately contain a solvent (also referred to as a solvent), a pigment, a stabilizer, a fragrance, etc.

[0047] Examples of such a solvent include the solvents exemplified for the above-described composition of the present invention.

[0048] The insecticide mat may contain one or more of these solvents. When the insecticide mat contains a solvent, the solvent content (including the amount of auxiliary solvents if further included) is preferably 20 to 65% by mass, more preferably 25 to 55% by mass, and even more preferably 30 to 50% by mass, based on the total amount of the insecticide mat. Specific solvent content examples include 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, and 65% by mass.

[0049] In one embodiment of the present invention, the solid carrier is a blank mat material composed of a fibrous carrier, more specifically, pulp and cotton linters, and the composition of the present invention is an insect control mat in which the blank mat material contains the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired. In this case, the insect control mat can be manufactured by impregnating the blank mat material with the following liquid composition (hereinafter referred to as "insect control mat chemical solution"): <Insect control mat chemical solution>

[0050] The content of natural pyrethrin in the insecticide solution for pest control mats used in the present invention is preferably 1 to 30% by mass, more preferably 1 to 20% by mass, and even more preferably 3 to 15% by mass, based on the total amount of the insecticide solution for pest control mats. Specific examples of natural pyrethrin content in the insecticide solution for pest control mats include 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, 20% by mass, 21% by mass, 22% by mass, 23% by mass, 24% by mass, 25% by mass, 26% by mass, 27% by mass, 28% by mass, and 29% by mass.

[0051] The content of the radical chain inhibitor contained in the insecticide solution for pest control mats used in the present invention is preferably 1 to 23% by mass, more preferably 1 to 17% by mass, and even more preferably 1 to 11.5% by mass, based on the total amount of the insecticide solution for pest control mats. Specific examples of radical chain inhibitor content in the insecticide solution for pest control mats include 1% by mass, 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, 20% by mass, 21% by mass, 22% by mass, and 23% by mass.

[0052] The content of the peroxide decomposing agent contained in the insecticide solution for pest control mats used in the present invention is preferably 1 to 20% by mass, more preferably 5 to 20% by mass, and even more preferably 5 to 10% by mass, based on the total amount of the insecticide solution for pest control mats. Specific peroxide decomposing agent content includes 1% by mass, 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, and 20% by mass.

[0053] When the insecticide solution for pest control mats used in the present invention contains a solvent, the solvent content is preferably 30 to 96% by mass, more preferably 45 to 92% by mass, and even more preferably 65 to 87% by mass, based on the total amount of the insecticide solution for pest control mats. Specific solvent content examples include 30% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, 80% by mass, 81% by mass, 82% by mass, 83% by mass, 84% by mass, 85% by mass, 86% by mass, 87% by mass, 88% by mass, 89% by mass, 90% by mass, 91% by mass, 92% by mass, 93% by mass, 94% by mass, 95% by mass, and 96% by mass.

[0054] In one embodiment of the insecticide solution for pest control mats, the insecticide solution for pest control mats contains 1 to 30% by mass of natural pyrethrin, 2 to 23% by mass of a radical chain inhibitor, 1 to 20% by mass of a peroxide decomposer, and 30 to 96% by mass of a solvent.

[0055] When manufacturing an insecticide mat by impregnating a blank mat material with a chemical solution for insecticide mats, the mass ratio of the blank mat material to the chemical solution for insecticide mats is preferably 1:0.43 to 1:2.3, more preferably 1:0.67 to 1:1.5, and even more preferably 1:0.82 to 1:1.2. Specific mass ratios of the chemical solution for insecticide mats to the blank mat material include 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2.0, 1:2.1, and 1:2.2.

[0056] One embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air for four hours at an evaporation rate in the range of 2 mg / hour to 100 mg / hour.

[0057] One embodiment of the present invention is a pest control method that includes the step of heating a pest control mat and evaporating natural pyrethrin into the air for four hours at an evaporation rate ranging from 2 mg / hour to 100 mg / hour.

[0058] Another embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air at an evaporation rate in the range of 2 mg / hour to 100 mg / hour for 6 hours. Yet another embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air at an evaporation rate in the range of 2 mg / hour to 100 mg / hour for 8 hours. Yet another embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air at an evaporation rate in the range of 2 mg / hour to 100 mg / hour for 8 hours. Examples of specific ratios (R4 / R1) include 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, 1.1, 1.2, 1.3, 1.4, and 1.5.

[0059] Another embodiment of the present invention is a method of controlling pests in which heating of the pest control mat is performed by placing the pest control mat on a hot plate and heating the pest control mat with the heated hot plate. Yet another embodiment of the present invention is a method of controlling pests in which heating with the hot plate is performed by heating the hot plate to a temperature of approximately 140 to 200°C (for example, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C) by electric heating. Yet another embodiment of the present invention is a method of controlling pests in which heating with the hot plate is performed by heating the hot plate to a temperature of approximately 120 to 200°C (for example, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C) by burning fuel.

[0060] A further embodiment of the present invention is a method for controlling pests, wherein the space from which the natural pyrethrin is evaporated includes at least one selected from entrances, corridors, toilets, washrooms, bathrooms, changing rooms, verandas, balconies, attics, stairs, garages, warehouses, attic storage, pantries, libraries, closets, cupboards, living rooms, bedrooms, dining rooms, and outdoors (e.g., gardens, yards, campgrounds, sports fields, forests). The space may preferably be outdoors.

[0061] The pests that can be controlled by the composition and pest control method of the present invention include various harmful insects and arthropods such as mites. Specifically, the pests that can be controlled include harmful flying insects such as Culex pipiens, Culex tritaeniorhynchus, Culex aeruginosa, and Culex pipiens; Aedes mosquitoes such as Aedes aegypti and Aedes albopictus; Anopheles mosquitoes such as Anopheles sinensis; midges; houseflies such as Muscicapa japonica, Muscicapa fuscipes, and Muscicapa japonica; blowflies, flesh flies, Drosophila, moth flies, phorid flies, horseflies, gnats, stable flies, and biting midges. Among these, mosquitoes such as Culex pipiens, Aedes mosquitoes, and Anopheles mosquitoes are particularly suitable as pests to be controlled. Furthermore, the composition of the present invention and the pest control method of the present invention are also effective against mosquitoes, flies, fleas, bed bugs, house dust mites, indoor dust mites, cockroaches, ticks, etc., which are classified as sanitary pests that transmit diseases and cause illness in humans, and these sanitary pests can also be listed as target pests for control. Another embodiment of the present invention is a method in which the above-mentioned pest control method is a method for exterminating sanitary pests. In this specification, "control" is a concept that includes extermination, repellent and prevention. "Extermination" is a concept that includes killing, knocking down, driving away or keeping away target pests, and it is preferable to kill or knock down the pests.

[0062] The present invention will be described in more detail below with reference to examples such as manufacturing examples and test examples, but the present invention is not limited to these examples.

[0063] Examples 1-9, Comparative Examples 1-3 (Production of pest control mats) The pest control solution for the pest control mats was prepared by mixing each component to have the composition shown in Tables 1-1, 1-2, and 1-3. 0.75 mL of this solution was spread onto each blank mat material (made of pulp and cotton linter, 0.21 cm thick, 3.5 cm long side, 2.2 cm short side, 695 mg mass), and pest control mats were obtained that contained 100 mg of natural pyrethrin per mat (Examples 1-9, Comparative Examples 1-3).

[0064]

[0065]

[0066] In the table, radical chain inhibitor 1: BHT; radical chain inhibitor 2: PBO; peroxide decomposer 1: 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) (JPH-1200 (manufactured by Johoku Chemical Industry)); peroxide decomposer 2: tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite (ADEKA STAB 1500 (manufactured by ADEKA)); peroxide decomposer 3: triisodecyl phosphite (ADEKA STAB 3010 (manufactured by ADEKA)) Peroxide decomposing agent 4: 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol (SUMILIZER® GP (manufactured by Sumitomo Chemical Co., Ltd.)); Solvent 1: Isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)). Test Example 1 (Amount of natural pyrethrin transpiration in pest control mats) Two pest control mats (pest control mat 1) manufactured in Example 1 were heated on a ceramic heater at 180°C, and the amount of natural pyrethrin transpiration (V1) in one hour between 0 and 1 hour after the start of heating, and the amount of natural pyrethrin transpiration (V4) in one hour between 3 and 4 hours of heating were analyzed. The amount of natural pyrethrin evaporating (mg / hour) was determined by collecting the vapor of volatile natural pyrethrin at predetermined intervals using a urethane foam-packed column for a predetermined time, then extracting it from the urethane foam with acetone, and quantitatively analyzing the amount of natural pyrethrin in the extract by high-performance liquid chromatography. The same procedure was performed for the pest control mats (pest control mats 2-9, comparative pest control mats 1-3) produced in Examples 2-9 and Comparative Examples 1-3. The results are shown in Table 2.

[0067] The pest control mats 1 to 9 of the present invention had a high ratio (V4 / V1) of the evaporation rate V4 (mg / hour) after 4 hours of heating to the evaporation rate V1 (mg / hour) after 1 hour of heating, confirming that the amount of natural pyrethrin transpiration was stably maintained over a long period of time. On the other hand, the comparative pest control mats 1 to 3, which do not belong to the present invention, had a low ratio (V4 / V1) of the evaporation rate V4 (mg / hour) after 4 hours of heating to the evaporation rate V1 (mg / hour) after 1 hour of heating, confirming that the amount of natural pyrethrin transpiration decreased significantly over time. Test Example 2 (Amount of Natural Pyrethrin Evaporation in Pest Control Mats) Two pest control mats (Pest Control Mat 9) manufactured in Example 9 were heated on a ceramic heater at 180°C, and the amount of natural pyrethrin evaporated per hour during the first 3-4 hours of heating (V4), the amount of natural pyrethrin evaporated per hour during the first 5-6 hours of heating (V6), and the amount of natural pyrethrin evaporated per hour during the first 7-8 hours of heating (V8) were analyzed. The amount of natural pyrethrin evaporated (mg / hour) was determined by collecting the vapor of volatile natural pyrethrin at predetermined intervals using a urethane foam-packed column for a predetermined time, extracting it from the urethane foam with acetone, and quantitatively analyzing the amount of natural pyrethrin contained in the extract by high-performance liquid chromatography. The results are shown in Table 3.

[0068] It was confirmed that the pest control mat 9 of the present invention not only maintains a high evaporation rate V4 (mg / hour) after 4 hours of heating, but also maintains high levels of evaporation rates V6 (mg / hour) after 6 hours of heating and V8 (mg / hour) after 8 hours of heating.

[0069] Test Example 3 (Efficacy Test of Insect Control Mats) In an outdoor area with a high density of mosquitoes, a tester wearing protective clothing remained still for a certain period of time until a sufficient number of mosquitoes gathered, and recorded the number of mosquitoes that landed on the protective clothing and the number of mosquitoes flying around. This was defined as the "initial mosquito population." A heated vaporization insecticide device (Thermacell's "Outdoor Black Fly and Insect Shield" with two insect control mats 9 heated for a predetermined time (4 hours, 6 hours, or 8 hours) placed on the ground 2.3 m away from the tester. The initial amount of natural pyrethrin spread on the two insect control mats 9 totaled 200 mg) was placed on the ground. Twenty minutes after the installation of the heated vaporization insecticide device, the number of mosquitoes that landed on the protective clothing or the number of mosquitoes flying around was recorded. This was defined as the "mosquito population after 20 minutes." The repellency rate was calculated based on the following formula. Repellency rate (%) = (Initial mosquito population - Mosquito population after 20 minutes) / Initial mosquito population × 100. The results are shown in Table 4.

[0070] In the above test procedure, instead of "Pest control mat 9 heated for a specified time (4 hours, 6 hours, or 8 hours)", "Pest control mat 1 heated for a specified time (4 hours)", "Pest control mat 2 heated for a specified time (4 hours)", "Comparison pest control mat 2 heated for a specified time (4 hours)", or "Comparison pest control mat 3 heated for a specified time (4 hours)" were used, and the test was conducted in the same manner except for the rest of the procedure. The results are shown in Table 5.

[0071] It was confirmed that the insect repellent mats 1, 2, and 9 belonging to the present invention exhibited a high repellent effect even after being heated for more than four hours. On the other hand, it was confirmed that the comparative insect repellent mats 2 and 3, which do not belong to the present invention, showed inferior repellent effects after being heated for four hours. In other words, it was suggested that the insect repellent mats belonging to the present invention can maintain their superior effectiveness even after prolonged use (heating).

[0072] Test Example 4 (User Experience of Heat-Vaporized Insecticide) One or more heat-vaporized insecticide devices, each containing two insecticide mats 1, were placed on the ground outdoors to achieve a predetermined amount of natural pyrethrin vaporization. The devices were powered on (heated) for 30 minutes to vaporize the natural pyrethrin. Afterward, the user experience was evaluated by approaching the heat-vaporized insecticide device and assigning a score based on the following criteria. The results are shown in Table 6. Criterion 1 (Odor) 3: Unpleasant 2: Sensitive but not unpleasant 1: Almost not noticeable 0: Not noticeable at all Criterion 2 (Sensations other than odor (e.g., scratchy throat, itchy or stinging nose)) 3: Unpleasant 2: Sensitive but not unpleasant 1: Almost not noticeable 0: Not noticeable at all Judgment: × (Poor usability): The sum of Criterion 1 and Criterion 2 is 5 or more △ (Issues with usability): The sum of Criterion 1 and Criterion 2 is 3 to 4 ○ (No problems with usability): The sum of Criterion 1 and Criterion 2 is 2 or less

[0073] It was confirmed that the user experience was good when the evaporation rate of natural pyrethrin was between 2 mg / hour and 100 mg / hour. On the other hand, it was confirmed that the user experience deteriorated when the evaporation rate of natural pyrethrin exceeded 100 mg / hour.

[0074] The present invention provides a pest control composition and a pest control method with excellent pest control effects.

[0075] 10 Hot plate 11 Pest control mat 12 Power switch 13 Casing

Claims

1. A pest control composition comprising natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier, wherein the ratio (V4 / V1) of the natural pyrethrin evaporation rate V4 (mg / hour) after heating at 180°C for 4 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 180°C for 1 hour is 0.2 to 1.

5.

2. The insecticide composition according to claim 1, wherein the radical chain inhibitor comprises at least one selected from the group consisting of dibutylhydroxytoluene, butylhydroxyanisole, and piperonib toxide.

3. The pest control composition according to claim 1, wherein the peroxide decomposing agent comprises at least one selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, triisodecyl phosphite, and tris(nonylphenyl) phosphite.

4. The pest control composition according to claim 1, wherein the peroxide decomposing agent comprises at least one selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and triisodecyl phosphite.

5. The pest control composition according to claim 1, wherein the mass ratio of the radical chain inhibitor to the peroxide decomposer is 1:0.25 to 1:

15.

6. A pest control mat, comprising the pest control composition according to any one of claims 1 to 5.

7. A method for controlling pests, comprising the step of evaporating natural pyrethrin into the air at a evaporation rate ranging from 2 mg / hour to 100 mg / hour for a period of four hours.

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