TW202100017A - One-liquid-type aqueous aerosol composition - Google Patents

Abstract

Provided is a one-liquid-type aqueous aerosol composition having excellent solubility in an aerosol composition of a pyrethrum extract, and having excellent stability and insecticidal efficacy as a one-liquid-type aqueous aerosol composition. This one-liquid-type aqueous aerosol composition contains: an undiluted aerosol solution containing (a) a pyrethrum extract, (b) a surfactant, (c) a C8-C16 aliphatic hydrocarbon, and (d) water; and (e) liquid petroleum gas (LPG) serving as a propellant. The (b) surfactant contains (f) a polyethylene glycol alkyl ester and (g) a sorbitan fatty acid ester, the blended weight ratio thereof [(f)/(g)] being 0.5 ≤ [(f)/(g)] ≤ 2.5, the blended amount of the (d) water relative to the total amount of the undiluted aerosol solution being 15-53 mass% (w/v), and the blended amount of the (e) propellant relative to the total amount of the one-liquid-type aqueous aerosol composition being 40-70 vol% (v/v).

Description

Single-component water-based spray composition

The present invention relates to a single-liquid aqueous spray composition containing pyrethrum extract.

In the past, in order to solve the problem of flammability of the formulation, and to improve the feeling of use in consideration of environmental issues, various proposals have been made regarding the use of water-based pesticides or water-based sprays. However, in general, considering the hydrophobicity of the insecticidal ingredients in its formulation, in order to obtain uniform emulsification stability, an aqueous organic solvent such as alcohol is mostly used. In addition, these formulations tend to be inferior in insecticidal efficacy depending on the type of target pests compared to non-aqueous oily sprays. It is believed that the reason is due to the penetration of the insecticidal ingredients from the skin surface of the pests.

In the previous document 1, there is disclosed a useful spray composition, which contains: spray stock solution, which contains (a) insecticidal ingredients, (b) surfactants, (c) aliphatic carbon number of 8-16 Hydrocarbons, and (d) water; and (e) propellants; and the blending ratio of (c) aliphatic hydrocarbons with 8-16 carbon atoms and (d) water is specified. Including these, most of the previous water sprays for pest control are water droplets in oil or oil droplets in water emulsion formulations. Therefore, the liquid phase part is separated in the spray container to become a two-component type, and the container needs to be shaken to uniformly disperse the liquid phase part before use.

As a single-liquid type water-based spray to improve this point, for example, the previous document 2 or the previous document 3 is proposed. Dimethyl ether is used as the propellant, and the latter requires organic solvents such as lower alcohols. The performance evaluation of the aqueous spray is not satisfactory.

As a single-liquid water-based spray to improve this point, for example, in the previous document 4, a single-liquid water-based spray composition is disclosed, which is characterized by comprising: a spray stock solution, which contains (a) insecticidal ingredients, (b) ) Surfactants made of sorbitan fatty acid esters and polyoxyethylene polyoxypropylene alkyl ethers, (c) aliphatic hydrocarbons with 8 to 16 carbon atoms, and (d) water; and as ( e) LPG (liquefied petroleum gas) of propellant; in the spray stock solution, relative to the amount of spray stock solution, it contains (b) 5-20% by volume of surfactant, (c) aliphatic hydrocarbon with 8-16 carbons 40-78% by volume, and (d) 15-53% by volume of water, and in (b) surfactant, the blending ratio of sorbitan fatty acid esters and polyoxyethylene polyoxypropylene alkyl ethers is 1: 1～5:1.

However, in recent years, consumers' natural desire has increased, and the demand for pesticides containing natural ingredients as effective ingredients has increased. In the water-based spray, the active ingredient is also required to contain natural ingredients such as pyrethrum extract obtained from pyrethrum which is a compositae plant. In general, pyrethrum extract contains natural pyrethrum as a mixture of 6 compounds, and further contains impurities from plants. Therefore, it is required to formulate a surfactant that is more suitable for single-liquid aqueous spray formulation. Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2001-89303 Patent Document 2: Japanese Patent Publication No. 61-45601 Patent Document 3: Japanese Patent Publication No. 7-121848 Patent Document 4: Japanese Patent Laid-Open No. 2003-40704

[The problem to be solved by the invention]

The present invention provides a single-liquid water-based spray composition having excellent solubility in a single-liquid water-based spray composition, excellent stability of the single-liquid water-based spray composition, and also excellent insecticidal efficacy by a pyrethrum extract . [Technical means to solve the problem]

In order to solve the above-mentioned problems, the inventors of the present invention have conducted intensive research and obtained the following insights: by preparing a spray stock solution containing a pyrethrum extract, a specific surfactant, aliphatic hydrocarbon and water, and a specific amount of The composition formed by the combination of propellants can achieve the purpose, thus completing the present invention.

That is, the invention of claim 1 is a single-liquid type aqueous spray composition comprising: a spray stock solution containing (a) a pyrethrum extract, (b) a surfactant, and (c) a carbon number of 8-16 Aliphatic hydrocarbons, and (d) water; and (e) LPG (liquefied petroleum gas) as a propellant; The above (b) surfactant contains (f) polyethylene glycol alkyl esters and (g) sorbitan fatty acid esters, and the blending weight ratio [(f)/(g)] is 0.5≦[(f) /(g)]≦2.5, The blending amount of the above (d) water relative to the total amount of the spray stock solution is 15 to 53% by mass (w/v), And the blending amount of the above-mentioned propellant (e) relative to the total amount of the single-liquid type aqueous spray composition is 40 to 70% by volume (v/v).

The pyrethrum extract used in the present invention includes 6 natural pyrethrum extracts of pyrethrin I, II, cinerrin I, II, jasmine I, II, impurities from plants, and solvents. It is suitable to use natural pyrethrum extract with a concentration of 10% to 80%, and it is more preferable to use natural pyrethrum extract with a concentration of 20 to 60%. The appropriate amount of pyrethrum extract is about 0.01～5.0% by mass (w/v) based on the content of natural pyrethrum in the spray stock solution. If it is less than 0.01% by mass (w/v), it cannot Obtain the desired insecticidal effect. On the other hand, if it exceeds 5.0% by mass (w/v), the solubility of the pyrethrum extract in the single-liquid aqueous spray composition may be problematic. From the viewpoint of the solubility or insecticidal efficacy of the pyrethrum extract to the single-liquid aqueous spray composition, it is more preferably about 0.20 to 3.0 mass% (w/v). Furthermore, there is no limitation on the origin of the pyrethrum extract or the composition ratio of each component.

The present invention has the following characteristics: use a surfactant prepared by blending (b) polyethylene glycol alkyl esters and sorbitan fatty acid esters, and further combine (f) polyethylene glycol alkyl esters with (g) The blending weight ratio [(f)/(g)] of sorbitan fatty acid esters is set to 0.5≦[(f)/(g)]≦2.5. Examples of polyethylene glycol alkyl esters include polyethylene glycol laurate, polyethylene glycol oleate, polyethylene glycol stearate, polyethylene glycol monolaurate, and polyethylene glycol Monooleate, polyethylene glycol monostearate, etc. On the other hand, examples of sorbitan fatty acid esters include sorbitan monolaurate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, and sorbitol anhydride. Monostearate and so on. If the blending weight ratio of polyethylene glycol alkyl esters and sorbitan fatty acid esters [(f)/(g)] is out of the range of 0.5≦[(f)/(g)]≦2.5, pyrethrum The solubility of the extract in the single-liquid type aqueous spray composition is reduced, and no emulsion is formed when it is made into a spray, or even if it is formed, the stability of the emulsion is poor and poor. From the viewpoint of the solubility of the pyrethrum extract to the single-liquid aqueous spray composition or the stability of the emulsion, it is more preferably 1.0≦[(f)/(g)]≦2.0.

In the present invention, in terms of the solubility of the pyrethrum extract to the single-liquid aqueous spray composition or the stability of the emulsion, it is preferable to further formulate polyoxyethylene polyoxyethylene in the above-mentioned formulated surfactant Propylene alkyl ethers. Examples of polyoxyethylene polyoxypropylene alkyl ethers include polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene stearyl ether, polyoxyethylene polyoxypropylene decyl Tetradecyl ether and the like, but are not limited to them. Moreover, as long as it does not hinder the solubility of the pyrethrum extract in the single-liquid aqueous spray composition or the stability of the emulsion, other types of surfactants, such as polyoxyethylene alkyl ether, polyoxyethylene, can be added. Alkyl phenyl ether, polyoxyethylene styrenated phenol, polyoxyethylene hydrogenated castor oil fatty acid ester, diglyceryl alkyl ester, etc. Furthermore, the surfactant is suitably adjusted to 5-20% by mass (w/v) in the spray stock solution of the present invention. If it is less than 5 mass% (w/v), a sufficient emulsion cannot be obtained. On the other hand, if it exceeds 20 mass% (w/v), it will affect the feeling of use such as stickiness, and the advantages of water-based spray cannot be obtained. , So it is not good.

In the present invention, the blending amount of (c) aliphatic hydrocarbons with 8 to 16 carbon atoms relative to the total amount of spray stock solution is 40 to 78% by volume (v/v). If it is less than 40% by volume (v/v), the skin penetration of pests is poor, so the insecticidal effect is low. On the other hand, if it exceeds 78% by volume (v/v), the flammability cannot be eliminated. The problem is therefore not good. As the aliphatic hydrocarbons, normal paraffins or isoparaffins can be cited, and normal paraffins are preferred in terms of effectiveness. Furthermore, other types of organic solvents can also be used within the range that does not impair the characteristics of the present invention.

Moreover, in the present invention, in order to obtain the desired action and effect, the blending amount of (d) water in the spray stock solution is set to 15-53 mass% (w/v). If it is less than 15% by mass (w/v), the flammability problem of the spray stock solution cannot be eliminated. On the other hand, if it exceeds 53% by mass (w/v), it is difficult to improve the insecticidal efficacy.

As (e) propellant, LPG (liquefied petroleum gas) is used, and DME (dimethyl ether), chlorofluorocarbon gas, hydrofluoroolefin, compressed gas (nitrogen, carbon dioxide, etc.) can be mixed within the range that can produce emulsion. . In addition, the blending amount of the propellant is preferably suppressed to the range of 40 to 70% by volume (v/v) relative to the total amount of the single-liquid type aqueous spray composition. If it does not reach 40% by volume (v/v), the spray particles will become thicker and the insecticidal effect will be problematic. On the other hand, if it exceeds 70% by volume (v/v), it will be insufficient in terms of safety for fireworks. good. Moreover, when reducing the amount of propellant or using compressed gas, the injection pressure may sometimes be reduced. As a countermeasure, for example, use LPG (liquefied petroleum gas) that increases the ratio of propane to butane. )it works.

In addition, in the single-liquid aqueous spray composition of the present invention, other insecticidal ingredients or repellent ingredients can also be formulated within a range that does not affect the solubility of the pyrethrum extract or the stability of the emulsion. For example, as insecticidal ingredients, there may be exemplified: fenbutin, permethrin, fenmethrin, fenmethrin, lenafenin, tetramethrin, alenin, puyalenin, furthrin, eprinin, Pyrethroid insecticidal ingredients such as Efennine, Bifenning, Yibining, Metternin, Byfuning, profluthrin, momfluorothrin and other pyrethroid insecticidal ingredients; New types of nicotine insecticidal ingredients such as Mipei, and organophosphorus insecticidal ingredients such as Diclopine, Dimethionate, and Dali. In addition, as repellent components, N,N-diethyl-m-toluidine, limonene, linalol, citronellal, menthol, menthyl acetate, menthone, cypress alcohol, geraniol, terpinene Alcohol, p-menthane-3,8-diol, eucalyptol, carane-3,4-diol, Icaridin {2-(2-hydroxyethyl)piperidine-1-carboxylic acid 1- Methyl propyl ester}, IR-3535 {3-[Acetyl (butyl) amino] ethyl propionate}, peppermint oil, lemon oil, lavender oil, eucalyptus oil, etc.

In addition, in the single-liquid water-based spray composition of the present invention, in addition to the insecticidal ingredients, acaricides, anti-fungal agents, antibacterial agents, fungicides, fragrances, etc. targeting molds or bacteria can also be appropriately formulated Agents, deodorants, stabilizers, antistatic agents, defoamers, excipients, etc. As acaricides, methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, benzyl benzoate, dibutyl sebacate, 3-iodo-2-propyne Butyl carbamate and the like. Examples of antifungal agents, antibacterial agents, and fungicides include cypress alcohol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, 5-chloro-2-methyl-4-isothiazoline -3-one, Saifenin, 3-methyl-4-isopropylphenol, o-phenylphenol, etc. Examples of aromatics include sweet orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, orange oil, jasmine oil, cypress oil, green tea essential oil, limonene, α- Aromatic ingredients such as pinene, linalool, geraniol, phenethyl alcohol, valeric aldehyde, p-isopropyl benzaldehyde, benzyl acetate, etc., the blend called "green fragrance" is equipped with the fragrance ingredients of green leaf alcohol or green leaf aldehyde Wait. Various deodorants can be used, including those selected from the family of Persimmon, Gramineae, Camellia (tea etc.), Ginkgo family, Melilotus family (Fritillaria, etc.), Moraceae (fig etc.), Rutaceae, A substance of more than one natural plant in the Acerola family (Acerola, etc.).

The invention of technical solution 2 is based on the composition of technical solution 1, (a) the blending weight ratio of (h) natural pyrethrum essence contained in the pyrethrum extract and the above-mentioned (b) surfactant [(h) /(b)] is set to 0.005≦[(h)/(b)]≦0.34.

(a) The blending weight ratio of (h) natural pyrethrum essences contained in the pyrethrum extract and the above-mentioned (b) surfactant [(h)/(b)] is suitably 0.005≦[(h)/ (b)]≦0.34, if it is [(h)/(b)]<0.005, the required insecticidal effect cannot be obtained, if it is 0.34<[(h)/(b)], there is pyrethrum Circumstances where the extract has problems with the solubility of the single-liquid aqueous spray composition or the stability of the emulsion. Among them, from the viewpoint of the solubility or insecticidal efficacy of the pyrethrum extract to the single-liquid aqueous spray composition, it is more preferably 0.005≦[(h)/(b)]≦0.25.

The invention of claim 3 is based on the structure of claim 1, and (b) the surfactant further contains polyoxyethylene polyoxypropylene alkyl ethers.

By formulating polyoxyethylene polyoxypropylene alkyl ethers, the solubility of the pyrethrum extract to the single-liquid aqueous spray composition or the stability of the emulsion is improved. [Effects of Invention]

The present invention provides a single-liquid water-based spray composition having excellent solubility in a single-liquid water-based spray composition, excellent stability of the single-liquid water-based spray composition, and also excellent insecticidal efficacy by a pyrethrum extract .

According to any one of the constitutions of technical solutions 1 to 3 of the present invention, the spray stock solution is non-flammable, and the propellant is further formulated to make a single-liquid aqueous spray composition, so there is no need to shake the container during use, which is excellent in use. In addition, the pyrethrum extract has excellent solubility in a single-liquid type aqueous spray composition. Furthermore, there is provided an extremely useful single-liquid water-based spray composition that has excellent stability and excellent insecticidal efficacy against various pests. In the manufacture of sprays, usually, the spray stock solution is filled in a pressure-resistant container with a valve part, and then the spray is filled under pressure to manufacture. The spray can be appropriately selected in shapes such as valves, nozzles, nozzles, etc. according to its use, purpose of use, target pests, etc., and can be in various embodiments.

Examples of pests effective for the single-liquid aqueous spray composition of the present invention include mosquitoes such as Culex pipiens pallens and Aedes aegypti, chironomid species, house flies and other flies, butterfly flies, gnats, and flies, etc. Order pests or creeping pests such as cockroaches, ants, millipedes, polypods, and termites, as well as house dust mites such as acaroid mites and dust mites, are extremely useful. Example

Then, based on specific examples and test examples, the single-liquid type aqueous spray composition of the present invention will be described in more detail. In addition, the present invention is not limited to the following examples.

Example 1. Pyrethrum extract (concentration of natural pyrethrum essence: 50%) 1.80 g (in the spray stock solution, the pyrethrum extract is 1.80% by mass (w/v), natural pyrethrum The essence is 0.90% by mass (w/v)), sorbitol monolaurate is 4.8 g (4.8% by mass (w/v) in the spray stock solution), and polyethylene glycol monooleate is 5.6 g (the spray stock solution The content is 5.6% by mass (w/v)), 2.4 g of polyoxyethylene polyoxypropylene decyl tetradecyl ether (2.4% by mass (w/v) in the spray stock solution), and the number of carbon atoms is 11-14. Paraffin-based aliphatic saturated hydrocarbons (trade name: Deotomisol) and 18 g of water (18 mass% (w/v) in the spray stock solution) 100 mL of the spray stock solution are placed in the spray container, the valve part is installed in the container, and the The valve is partially pressurized and filled with 150 mL of LPG (liquefied petroleum gas) (60% by volume (v/v) relative to the total amount of the single-liquid type aqueous spray composition) to obtain a spray containing the single-liquid type aqueous spray composition of the present invention Agent.

It is believed that the spray stock solution used in the present invention has not measured the ignition point of the test method based on the Fire Protection Law, and the flammability problem is greatly reduced. In addition, since the single-liquid type aqueous spray composition of the present invention is a single-liquid type, there is no need to shake the container during use, and the usability is excellent. Furthermore, although sprays made of formulated water show lower insecticidal effects than oil-based sprays that do not contain water, the effectiveness of sprays containing the single-liquid type aqueous spray composition of the present invention is hardly inferior to those containing the same amount The oily spray of pyrethrum extract.

Test Example 1. According to Example 1, various single-liquid type aqueous spray compositions shown in Table 1 were prepared, and the following tests were performed. (1) Solubility of pyrethrum extract: visually confirm the solubility of pyrethrum extract to various single-liquid aqueous spray compositions. ○, △, × indicate the results. (○: single-component, transparent, △: single-component, semi-transparent, ×: not single-component) (2) Stability of the emulsion: Fill various single-liquid water-based spray compositions into pressure-resistant glass bottles and store them at 5°C and 45°C to investigate the stability of the emulsion. ○, △, × indicate the results. (○: single-component, transparent, △: single-component, semi-transparent, ×: not single-component)

[Table 1] Spray stock solution (mass% in stock solution (w/v)) stability (a) Pyrethrum extract ((h) natural pyrethrum extract) (b) Surfactant (d) Water (c) Aliphatic hydrocarbons (e) Propellant (volume% in spray content) (f)/(g) (h)/(b) Solubility of pyrethrum extract to single-liquid aqueous composition 5℃ 45°C 1 1.80(0.90) Sorbitan monolaurate 4.8 PEG monooleate 5.6 POEPOP decyl myristyl ether 2.4 18 N-paraffin balance LPG 60 1.17 0.070 ○ ○ ○ 2 1.20(0.60) Sorbitan monolaurate 4.0 PEG monooleate 7.5 POEPOP decyl myristyl ether 2.5 20 N-paraffin balance LPG 60 1.88 0.043 ○ ○ ○ 3 1.20(0.60) Sorbitan monolaurate 4.2 PEG monooleate 5.0 POEPOP decyl myristyl ether 2.5 16 N-paraffin balance LPG 60 1.19 0.051 ○ ○ ○ 4 1.20(0.60) Sorbitan monooleate 4.2 PEG monooleate 5.0 POEPOP decyl tetradecyl ether 2.5 18 N-paraffin balance LPG 55 DME 5 1.19 0.051 ○ ○ ○ 5 1.20(0.60) Sorbitan monolaurate 4.5 PEG monooleate 5.4 POEPOP decyl myristyl ether 2.7 19 Isoparaffin balance LPG 60 1.20 0.048 ○ ○ ○ Example 6 4.40(2.20) Sorbitan monooleate 4.0 PEG monooleate 5.0 POEPOP decyl tetradecyl ether 2.9 16 N-paraffin balance LPG 55 1.25 0.185 ○ ○ ○ 7 6.00(3.00) Sorbitan monolaurate 4.6 PEG monooleate 5.0 POEPOP decyl myristyl ether 2.9 twenty four N-paraffin balance LPG 60 1.09 0.240 ○ ○ ○ 8 7.80(3.90) Sorbitan monolaurate 4.2 PEG monooleate 5.0 POEPOP decyl myristyl ether 2.5 17 N-paraffin balance LPG 60 1.19 0.333 △ ○ △ 9 0.20(0.10) Sorbitan monooleate 7.1 PEG monolaurate 8.4 POEPOP decyl myristyl ether 4.2 twenty two N-paraffin balance LPG 60 1.18 0.005 ○ ○ ○ 10 0.40(0.20) Sorbitan monooleate 7.1 PEG monolaurate 8.4 POEPOP decyl myristyl ether 4.2 15 N-paraffin balance LPG 60 1.18 0.010 ○ ○ ○ 11 1.80(0.90) Sorbitan monolaurate 4.8 PEG monooleate 5.6 POEPOP lauryl ether 2.4 18 N-paraffin balance LPG 60 1.17 0.070 ○ ○ ○ 1 1.20(0.60) PEG monooleate 6.4 POEPOP decyl tetradecyl ether 4.3 17 N-paraffin balance LPG 60 - 0.056 × × × 2 1.20(0.60) Sorbitan monooleate 6.3 POEPOP cetyl ether 3.6 18 N-paraffin balance LPG 60 - 0.061 △ △ △ 3 1.20(0.60) Sorbitan monolaurate 4.0 PEG monooleate 12.5 POEPOP decyl myristyl ether 2.5 16 N-paraffin balance LPG 60 3.13 0.032 × × × Comparative example 4 1.20(0.60) Sorbitan monolaurate 4.0 PEG monooleate 7.5 POEPOP decyl myristyl ether 2.5 18 N-paraffin balance DME 56 1.88 0.043 △ △ △ 5 1.20(0.60) Sorbitan monooleate 2.0 PEG monooleate 2.0 90 N-paraffin balance LPG 50 - 0.150 △ ○ ○ 6 2.40(1.20) Sorbitan monostearate 5.0 POEPOP stearyl ether 1.5 18 N-paraffin balance LPG 60 - 0.185 △ △ × 7 1.20(0.60) Sorbitan monolaurate 10 PEG monooleate 4.5 POEPOP decyl myristyl ether 2.5 16 N-paraffin balance LPG 60 0.45 0.035 △ ○ × *POEPOP: Polyoxyethylene polyoxypropylene *PEG: Polyethylene glycol

Test Example 2. The single-liquid type aqueous spray compositions of Examples 1, 2 and Comparative Example 5 in Table 1 were prepared to obtain an aqueous spray. In addition, 1.80 g of the same amount of pyrethrum extract (concentration of natural pyrethrum essence: 50%) as in Example 1 (in the spray stock solution, the pyrethrum extract is 1.80% by mass (w/v), The natural pyrethrum essence is 0.90% by mass (w/v)) dissolved in a normal paraffin-based aliphatic saturated hydrocarbon (trade name: Deotomisol) with 11 to 14 carbon atoms to prepare 100 mL of a spray stock solution. The spray stock solution is put into a spray container, a valve part is installed in the container, and 150 mL of LPG (liquefied petroleum gas) is pressurized through the valve part (60% by volume (v/v) relative to the total spray composition), Preparation of oily spray. Regarding Example 2 and Comparative Example 5, oil-based sprays were also prepared in the same manner. Various sprays were used for the tests shown below. (1) Insecticidal efficacy test (glass chamber method) Put houseflies (approximately 25 male and female adults in one group) in a 60 cm cube (0.216 m ³ ) glass chamber, spray the test spray for 1 second, and record the accompanying time Knock down the number of insects through it. The KT50 value was determined, the potency of the oil-based spray was 1.0, and the relative potency of the aqueous spray (Examples 1, 2 and Comparative Example 5) is shown in Table 2. Furthermore, the relative insecticidal efficacy is calculated by the formula (KT50 value of oil-based spray)/(KT50 value of water-based spray).

[Table 2] Relative insecticidal efficacy 1 0.90 Example 2 0.95 Comparative example 5 0.53 Oily spray 1.00

The results of Test Examples 1 and 2 show that the pyrethrum extract of the single-liquid aqueous spray composition of the present invention has excellent solubility. In addition, it is a single-liquid type with excellent emulsion stability, and its insecticidal efficacy is not inferior to the control oily spray, which is practical. Among them, the formula weight ratio [(h)/(b)] of the (h) natural pyrethrum essence contained in the pyrethrum extract and the above (b) surfactant is 0.005≦[(h)/(b) )] Examples 1-7, 9, 10 and 11 of ≦0.25 are particularly excellent in the solubility of the pyrethrum extract to the spray composition and the insecticidal efficacy. On the other hand, as in Comparative Example 1 or Comparative Example 2, the surfactant is not a combination of (f) polyethylene glycol alkyl esters and (g) sorbitan fatty acid esters, and as in Comparative Example 3 or Comparative Example 7 Generally, the surfactant is a combination of the two but the blending weight ratio [(f)/(g)] is out of the range of 0.5≦[(f)/(g)]≦2.5, the pyrethrum extract is compared to the single The liquid-type water-based spray composition has low solubility and poor emulsion stability. In addition, when DME was used as a propellant (Comparative Example 4), the stability of the emulsion was reduced. Furthermore, the pyrethrum extract was added to the surfactant considered suitable in Japanese Patent Laid-Open No. 2003-40704 (Comparative Example 2, Comparative Example 6), and the pyrethrum extract was sprayed on a single-liquid type aqueous solution. The solubility of the composition is not satisfactory. The reason is that, in Japanese Patent Laid-open No. 2003-40704, synthetic pyrethroid compounds are used as insecticidal ingredients. In contrast, the natural pyrethrum extract used in this application contains more plant-derived For the impurities, it is difficult to apply the previous technology when selecting the surfactant, and a high degree of compatibility is required. In addition, in the formula (Comparative Example 5) that increased the amount of water in the spray stock solution, the insecticidal efficacy was greatly reduced. [Industrial availability]

The present invention is a single-liquid water-based spray composition with excellent solubility of a pyrethrum extract in a single-liquid water-based spray composition, excellent stability of the single-liquid water-based spray composition, and excellent insecticidal efficacy , Suitable for use as an aqueous spray containing pyrethrum extract.

Claims (3)

A single-liquid type aqueous spray composition, which contains: a spray stock solution, which contains (a) a pyrethrum extract, (b) a surfactant, (c) aliphatic hydrocarbons with 8 to 16 carbon atoms, and ( d) Water; and (e) LPG (liquefied petroleum gas) as propellant; The above (b) surfactant contains (f) polyethylene glycol alkyl esters and (g) sorbitan fatty acid esters, and the blending weight ratio [(f)/(g)] is 0.5≦[(f) /(g)]≦2.5, The blending amount of the above (d) water relative to the total amount of the spray stock solution is 15 to 53% by mass (w/v), And the blending amount of the above-mentioned propellant (e) relative to the total amount of the single-liquid type aqueous spray composition is 40 to 70% by volume (v/v). The single-liquid aqueous spray composition of claim 1, wherein the formula weight ratio of (h) natural pyrethrum essence contained in the above (a) pyrethrum extract and the above (b) surfactant is [(h )/(b)] is 0.005≦[(h)/(b)]≦0.34. The single-liquid type aqueous spray composition according to claim 1, wherein the above-mentioned (b) surfactant further contains polyoxyethylene polyoxypropylene alkyl ethers.