JPH0459710A - Insecticidal liquid agent - Google Patents

Abstract

PURPOSE:To obtain a insecticidal liquid agent stable for a long period of time with reducing unpleasant smell and suppressing irritation, malodor or toxicity of a solvent by exclusively using an alkylbenzene having >=20 carbon number, using in a single or mixing or co-using said solvent with other solvent CONSTITUTION:An alkylbenzene having >=20, especially >=26 carbon number (e.g. pentadecylbenzene) is contained in the aimed insecticidal liquid agent as a solvent. As an insect-killing component, especially (RS)-[O-1-(4-chlorophenyl) pyrazol-4-yl=O-ethyl=S-propylphosphorothioate is contained. A mixing amount of alkylbenzene is preferably about 40-90wt.% of total final formulation. By using said solvent, irritation, odor and toxicity of final solvent is able to be reduced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a long-term stable and reduced unpleasant odor, which is obtained by using alkylbenzene having 20 or more carbon atoms as a solvent, alone or in combination, or in combination with other solvents. It concerns liquid insecticides.

In particular, as an active ingredient (RS)-[0-1-(4-chlorophenyl)pyrazol-4-yl=O-ethyl=S
-propyl phosphorothioate] (hereinafter referred to as viraclofos).

(Prior art and problems to be solved by the invention) In general, insecticidal emulsions are made by dissolving active ingredients in an organic solvent and adding an appropriate emulsifier. Hydrocarbons or paraffinic hydrocarbons such as kerosene are used.

However, these solvents have a unique odor and are not recommended.

When sprayed or sprayed in general households as an epidemic prevention insecticide for the purpose of exterminating sanitary pests such as mosquitoes and cockroaches, the odor and irritation are a major problem. Furthermore, these organic solvents are generally highly volatile and flammable, and their use has been increasingly avoided in recent years.

Therefore, it is desired to develop an insecticidal liquid agent with reduced irritation, odor, and toxicity of organic solvents.

An object of the present invention is to provide an insecticidal liquid agent that is suppressed in irritation, bad odor, and toxicity caused by such solvents.

(Means for Solving the Problem) As a result of intensive research to solve the above object, the present inventors found that in an emulsion containing vilaclophos, the number of carbon atoms is 2.
It was discovered that an emulsion composition with less irritation and unpleasant odor and good storage stability can be obtained by using 0 or more alkylhensen alone or in combination or in combination with other solvents, and after further studies, the present invention was completed. I ended up doing it.

That is, the present invention relates to an insecticidal liquid agent characterized by containing an alkylbenzene having 20 or more carbon atoms as a solvent.

The alkylhensen used in the present invention preferably has 20 or more carbon atoms. Generally, those having 26 or less carbon atoms are preferred.

The alkylbenzene used in the present invention usually has the formula 6 (%) [wherein, X is a linear or branched C5-11 or C
+3-20 alkyl group, n indicates the number of alkyl groups X substituted on the benzene ring, and is usually an integer of 1 to 4 or preferably. ]
Compounds represented by are preferred. More preferably, X is a CI4-16 alkyl group. Further, these alkylhensens may be used alone or in a mixture thereof. Commercially available alkylhensens can also be used. Specifically, pentatenruhenzen, alkene 20T (Japanese stone @
3 detergent CI4 alkyl φ to CI8 alkyl φ or a mixture mainly, φ indicates benzene. Same below) Alkene 100
P (mixture mainly consisting of CI5 alkyl φ to C2o alkyl φ) or the like is not limited to these as long as it is conveniently used or satisfies the above conditions.

Furthermore, these alkylhensens and other organic solvents may be used in combination without impairing the effects of the present invention.

Next, the insecticidal ingredients that can be used in the liquid preparation according to the present invention include:
(RS)-[0-1-(4-chlorotunyl)pyrazol-4-yl-ethyl S-propylphosphorothioate] (i.e. viraclofos), 0,0-dimethyl〇-(3-methyl-4nitrophenyl) ) Thiophosphate (MEP), 00-dimethyl 0(2,4,5-)lichlorophenyl)phosphorothioate (Nancol), ○
, Q-7 methyl-1-hydro-7-2,2,2-trichloroethylphosphonate (DEP), 01O-dimethyl 0-(2,2-dichlorovinyl) phosphate (DDv
p), 0.0-diethyl/1-(2-isopropyl 4-methyl-6-pyrimidinyl) phosphorothioate (diazinon), o, o, o', o'-tetramethyl 0.0'
-thiodibaraphenylene phosphorothioate (abate), 0,0-dimethyl〇-(4cyanophenyl) phosphorothioate (CYAP), 2-(4-ethoxyphenyl)-2-methylpropyl 3-phenoxybenzyl ether (ethofenbrox), (RS) α-Cyano-3-phenoxybenzyl (S)-2-(4-difluoromethodiphenyl)-3-methylbutylade (flucitrinate), 2-secocidalybutylphenyl-N
-Methyl carbamate (BPMC), among others, the present invention can be effectively applied to emulsions of viraclofos. It goes without saying that these a-drug active ingredients may be combined as a mixture if necessary. In particular, a mixture of viraclofos and etofenpronox is effective.

The content of the agrochemical active ingredient in the present invention is about 1 to 50% by weight, preferably 3 to IO% by weight, based on the entire final preparation.
or appropriate. When mixed with other agrochemical active ingredients, the amount of the agrochemical active ingredient as a whole should be 11 to
70% by weight, preferably 3.5-20% by weight.

The amount of alkylbenzene used in the present invention is 30 to 95% by weight based on the entire final preparation.

Preferably it is 40 to 90% by weight.

Auxiliary ingredients such as a surfactant, a synergist, and a fragrance may be added to this emulsion, if necessary.

Specifically, the above-mentioned auxiliary components include surfactants [e.g. Nidoxanone P-8L (Kochu Kasei), Tsuruhole 310E (
Toho Chemical) Noniball 60 (Kochu Kasei)], Kyokasei)]
, fragrance [e.g. Insecticyte 6E71958 (Ogawa Perfume), Insecticyde 6E71957 (Ogawa Perfume)]
Examples include auxiliary agents such as.

For example, in the case of the above emulsion of vilaclofos, by using CI4 alkylbenzene to C7° alkylbenzene and adding the above surfactant, a formulation with better stability and no unpleasant odor can be obtained. The insecticidal liquid agent of the present invention can be produced by a conventional method or a method analogous thereto. Specifically, an agrochemical active ingredient is added to an alkylbenzene or a mixed solvent of alkylbenzene and another solvent, and thoroughly stirred to form a uniform solution. If necessary, the other auxiliary ingredients mentioned above (surfactant, synergist, fragrance) are added to this and further stirred and mixed to obtain a uniform emulsion.

The insecticidal liquid of the present invention can be applied by a conventional method, but - for boat fishing, use tap water, etc., and apply at a predetermined dilution ratio (approximately 10
It is preferable to dilute the composition to 2 times) and then spray it into a mist using a hand sprayer or a pump-type electric sprayer.

Examples are given below to specifically explain the effects of the present invention.

Example 1 50 parts of vilaclophos was added to 87.0 parts of alkene 20T, and after stirring and mixing thoroughly, toxanone P8L 8.
0 part was added and further stirred to obtain a vilaclophos emulsion.

Example 2 87.0 parts of pentadecylbenzene and 5.0 parts of viraclofos
After stirring and mixing thoroughly, add Toxanone P-8L.
8.0 parts were added and further stirred to obtain a viraclophos emulsion.

Example 3 After 43.5 parts of Alkene 20T and 43.5 parts of refined kerosene are mixed, 5.0 parts of viraclophos is added and mixed with stirring. Further, 8.0 parts of Toxanone P-8L was added to the mixture and stirred to obtain a viraclofos emulsion.

Example 4 After mixing 40.0 parts of alkene 20T and 47.0 parts of xylene, 5.0 parts of viraclophos is added and mixed with stirring. 80 parts of Toxanone P-8I was further added to this,
Stir to obtain vilaclophos emulsion.

Example 5 30 parts of vilaclophos and 0.5 part of ethofenbrox were added to 8.7.5 parts of alkene 20T and mixed with sufficient stirring, followed by 6.0 parts of toxanone P-8L.

Noniball 2: Add part O and 1.0 part of octachlorodipropyl ether and stir further to obtain a vilaclofos etofenprosox emulsion.

Example 6 After mixing 40.0 parts of alkene 207 and 47.5 parts of xylene, 3.0 parts of viraclofos and 0.5 parts of ethofenbrox are added and mixed with stirring.

In addition, 6.0 parts of Toxanone P-8L, 2.0 parts of Nocopol, and 1.0 parts of octachlorodipropyl ether.
of the mixture and further stirred to obtain a viraclofos-ethofenbrox emulsion.

Reference Example 1 After adding 5.0 parts of viraclofos to 87.0 parts of refined kerosene and stirring and mixing, 8.0 parts of Toxanone P-8L was added,
Further stirring is performed to obtain a vilaclophos emulsion.

Reference Example 2 After adding 5.0 parts of vilaclophos to 87.0 parts of xylene and stirring and mixing, 8.0 parts of toxanone P-'8L was added and further stirred to obtain a vilaclophos emulsion.

Reference Example 3 3.0 parts of viraclofos and 0.5 parts of etofenpronox were added to 5 parts of Kin 128F and mixed with stirring.

To this, 6.0 parts of Toxanone P-8L, 2.0 parts of Nocopol, and 1.0 part of octachlorodipropyl ether were added and further stirred to obtain a viraclofos-ethofenebrox emulsion.

Test Example 1 Examples 1 to 6. Regarding Reference Examples 1 to 3, the odor, emulsifying property, and stability of the main ingredient were measured by the following methods.

(1) Odor measurement method A 10-fold diluted emulsion was prepared, sprayed into a small room using a hand sprayer, smelled immediately after spraying, and judged based on the following criteria.

1 I hardly feel it 2. Slightly felt 3, felt 4, felt strongly (2) Emulsifying property measurement method 3 degrees hardened water 225 in a scalpel/linter with a 250 rotary stopper, add 25 g of emulsion, and check the emulsification state after inverting 10 times. observed.

(3) Method for Measuring Base Agent Stability For each emulsion, the active ingredient content immediately after preparation is measured by HPLC method, and this is taken as the initial content. 1 o each emulsion
oy was placed in a brown glass bottle, sealed and stored at room temperature for one year, and the active ingredient content was measured again by HPLC method.

Table 1 Test Results Test Example 2 Emulsions containing viraclofos 3, Ow/w% and etofenfuronox 0,5 w/w% shown in Table 2 were prepared and tested in the same manner as in Test Example 1.

Table 2 Test Results As shown in Test Examples 1 and 2 above, by using alkylhensen as a solvent according to the present invention, a stable insecticidal emulsion with reduced unpleasant odor peculiar to emulsions can be obtained.

Claims (2)

[Claims] (1) An insecticidal liquid agent containing an alkylbenzene having 20 or more carbon atoms as a solvent. (2) As an insecticidal component (RS)-[0-1-(4-chlorophenyl)pyrazol-4-yl=O-ethyl=S-
The insecticidal liquid preparation according to claim 1, which contains propyl phosphorothioate.