JPH072608A - Agrichemical solid formulation - Google Patents

Abstract

PURPOSE:To improve the storage stability of acephate in an acephate technical product or in an agrichemical solid formulation containing the acephate by adding boron oxide and/or metaboric acid. CONSTITUTION:A method for stabilizing acephate comprises adding boron oxide and/or metaboric acid to an acephate technical product or an agrichemical solid formulation containing the acephate, and the acephate improved in storage stability adding the boron oxide and/or the metaboric acid.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a stabilized agricultural chemical solid preparation containing acephate.

2. Description of the Related Art Acephate (O, S-dimethyl acetylphosphoramidothioate) is used in The Pesticide Ma
nual 8th edition (1987 The British Crop Protection Cou
(published by Ncil), which is a compound having an insecticidal activity described on page 1, and is currently used as an active ingredient of agricultural insecticides because it is effective in controlling various pests.

However, since acephate is not very stable in pesticide formulations,
Depending on storage conditions, the acephate in the preparation was decomposed severely, and as a result, the insecticidal efficacy of acephate could not be effectively utilized. Therefore, it has been desired to develop a stable pesticide formulation containing acephate.

[0002]

The present invention provides a stabilized pesticide solid formulation containing (a) acephate, (b) boron oxide and / or metaboric acid, and (c) a solid carrier for formulation. This is because the addition of boron oxide or metaboric acid stabilizes the acephate drug substance or the acephate in the agricultural chemical solid preparation. The amount of boron oxide and / or metaboric acid effective for stabilizing acephate is generally 0.01 to 0.5 parts by weight per 1 part by weight of acephate, but of course no problem will occur even if it is added in excess. Absent.

In the present invention, the content of acephate in the agricultural chemical solid preparation is generally 0.5 to 99% by weight, preferably 5 to 95% by weight, and the stabilizer boron oxide and / or metaboric acid is contained. The amount is necessary to stabilize the acephate, usually 0.01 to 50% by weight, preferably 1 to 20% by weight, more preferably 1 to 10% by weight. As the solid carrier for the formulation used in the present invention, kaolin clay, attapulgite clay, sericite clay, pyrophyllite clay, montmorillonite clay, zeolite, bentonite, acid clay, activated clay, serpentine, talc, diatomaceous earth and other mineral substances Examples thereof include carriers, inorganic salts such as sulfates, nitrates and chlorides, inorganic carriers such as synthetic carriers such as silica, and organic carriers such as sugars, starch, dextrin, wheat flour, soybean flour, corn flour and wood flour. These solid carriers for preparation are usually contained in the agricultural chemical solid preparation of the present invention in an amount of 1 to 90% by weight, preferably 20 to 7%.
Contains 0% by weight.

The agricultural chemical solid preparation of the present invention may further contain various kinds of auxiliary agents for agricultural chemical preparations, such as surfactants, dyes, fragrances, known stabilizers and the like. And 0.1 to 35% by weight, preferably 2 to 10% by weight, in the solid agricultural chemical preparation of the present invention. Examples of the surfactant include alkylsulfate salts such as sodium lauryl sulfate, alkylarylsulfonates such as sodium alkylnaphthalenesulfonate, ligninsulfonates such as sodium ligninsulfonate, succinate derivative, polyethylene glycol alkylaryl. Examples include anionic surfactants such as ether sulfate ester salts and formaldehyde condensates of aromatic sulfonates, and nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, and polyoxyethylene arylaryl ethers. To be The pesticide solid preparation of the present invention may further contain other pesticide active ingredients, for example, pyrethroid compounds such as fenpropatorin and fenvalerate.

The agricultural chemical solid preparation of the present invention comprises (a) acephate, (b) boron oxide and / or metaboric acid, and (c).
A solid carrier for the formulation, if necessary, a surfactant, etc. are added, mixed with a mixer, etc., and crushed with a crusher such as an air mill, a hammer mill, a centrifugal crusher, or the crushed product is further compressed with a roller compactor, etc. It is produced by a usual method such as molding into granules using a molding machine, an extrusion granulator, or a rolling granulator.

[0006]

The present invention will be described in more detail below with reference to formulation examples and test examples, but the present invention is not limited to the following examples. Formulation Example 1 50 parts by weight of acephate, 5 parts by weight of boron oxide, and 45 parts by weight of Wessalon S (synthetic silicic acid manufactured by Degussa) were mixed with a mixer and then finely pulverized with a centrifugal pulverizer to obtain the solid pesticide formulation of the present invention. Obtain a wettable powder. Formulation Example 2 50 parts by weight of acephate, 5 parts by weight of boron oxide and 45 parts by weight of Tokusil GU-N (synthetic silicic acid manufactured by Tokuyama Soda) were mixed with a mixer, and then finely pulverized with a centrifugal pulverizer, and the pesticide solid formulation of the present invention To obtain a wettable powder. Formulation Example 3 50 parts by weight of acephate, 5 parts by weight of boron oxide, and 45 parts by weight of Hi-Seal 233 (synthetic silicic acid made by PPG) were mixed by a mixer, and then finely pulverized by a centrifugal pulverizer to prepare water as the pesticide solid formulation of the present invention. Get the remedy. Formulation Example 4 25 parts by weight of acephate, 10 parts by weight of boron oxide and 65 parts by weight of ammonium sulfate are mixed in a mixer and then finely pulverized by a centrifugal pulverizer to obtain a wettable powder which is a solid pesticide formulation of the present invention.

Formulation Example 5 75 parts by weight of acephate, 10 parts by weight of boron oxide and 15 parts by weight of ammonium sulfate are mixed in a mixer and then finely pulverized by a centrifugal pulverizer to obtain a wettable powder which is a solid agricultural chemical formulation of the present invention. . Formulation Example 6 25 parts by weight of acephate, 5 parts by weight of boron oxide, 5 parts by weight of sodium dodecylbenzenesulfonate and 6 parts of diatomaceous earth
After mixing 5 parts by weight with a mixer, the mixture is finely pulverized with a centrifugal pulverizer to obtain a wettable powder which is the agricultural chemical solid preparation of the present invention. Formulation Example 7 40 parts by weight of acephate, 10 parts by weight of metaboric acid, 10 parts by weight of ammonium sulfate and Hi-Seal 233 (supra)
After mixing 40 parts by weight with a mixer, it is finely pulverized with a centrifugal pulverizer to obtain a wettable powder which is the agricultural chemical solid preparation of the present invention.

Test Example 1 The wettable powders obtained in Formulation Examples 1, 2 and 3 were sealed in a 50 ml glass ampoule and stored in a thermostat at 60 ° C. for 2 weeks. The content of acephate in the preparation before and after storage was measured using gas chromatography, and the decomposition rate was determined by the following formula.

[Equation 1] The same applies to Comparative Formulations 1, 2 and 3 prepared in the same manner as in Formulation Examples 1, 2 and 3 using 5 parts by weight of Wesalone S, Tokusil GU-N or Hi-Seal 233 instead of 5 parts by weight of boron oxide. The decomposition rate was calculated.
The results are shown in Table 1.

[0009]

[Table 1]

Test Example 2 The wettable powders obtained in Formulation Examples 4 and 5 were enclosed in a 50 ml glass ampoule and stored in a thermostat at 60 ° C. for 2 weeks. The content of acephate in the preparation before and after storage was measured using gas chromatography, and the decomposition rate was determined by the above formula. Further, in Preparation Examples 4 and 5, the decomposition rate was similarly obtained for Comparative Preparations 4 and 5 prepared in the same manner by using 10 parts by weight of ammonium sulfate instead of 10 parts by weight of boron oxide. The results are shown in Table 2.

[Table 2]

Test Example 3 The wettable powder obtained in Preparation Example 6 was enclosed in a 50 ml glass ampoule and stored in a thermostat at 60 ° C. for 2 weeks. The content of acephate in the preparation before and after storage was measured using gas chromatography, and the decomposition rate was determined by the above formula. Further, the degradation rate was similarly obtained for Comparative Preparation 6 prepared in the same manner as in Preparation Example 6, except that 5 parts by weight of diatomaceous earth was used instead of 5 parts by weight of boron oxide. The results are shown in Table 3.

[Table 3]

Test Example 4 The wettable powder obtained in Preparation Example 7 was enclosed in a 50 ml glass ampoule and stored in a thermostat at 60 ° C. for 2 weeks. The content of acephate in the preparation before and after storage was measured using gas chromatography, and the decomposition rate was determined by the above formula. Further, the degradation rate was similarly determined for Comparative Preparation 7 prepared in the same manner as in Preparation Example 7, except that 10 parts by weight of Hi-Seal 233 was used instead of 10 parts by weight of metaboric acid or aluminum oxide. The results are shown in Table 4.

[Table 4]

[0013]

INDUSTRIAL APPLICABILITY According to the present invention, the storage stability of acephate in an acephate drug substance or an agrochemical solid preparation containing acephate is improved by adding boron oxide and / or metaboric acid.

Claims (5)

[Claims] 1. A solid agricultural chemical preparation comprising: (a) acephate, (b) boron oxide and / or metaboric acid, and (c) a solid carrier for the preparation. 2. A solid agricultural chemical formulation comprising (a) acephate, (b) boron oxide and (c) solid carrier for formulation. 3. A solid agricultural chemical preparation comprising: (a) acephate, (b) metaboric acid, and (c) solid carrier for preparation. 4. A solid agricultural chemical preparation containing acephate,
A method for stabilizing acephate, which comprises adding boron oxide and / or metaboric acid. 5. A stabilized acephate obtained by adding boron oxide and / or metaboric acid.