JPH072610A - Agrochemical solid formulation - Google Patents

Abstract

(57) [Summary] [Structure] Stabilization method of acephate by adding synthetic aluminum silicate to pesticide solid preparation containing acephate drug substance or acephate, and acephate having improved storage stability by addition of synthetic aluminum silicate . [Effect] The present invention improves the storage stability of acephate in a solid formulation of agricultural chemicals containing acephate drug substance or acephate by adding synthetic aluminum silicate.

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 preparation containing acephate and synthetic aluminum silicate. By adding synthetic aluminum silicate, acephate in the pesticide solid preparation can be improved. This is due to being stabilized. The amount of synthetic aluminum silicate effective to stabilize the acephate is generally greater than or equal to 0.05 parts by weight per part by weight of acephate. The synthetic aluminum silicate used in the present invention is usually
It is produced by adding a water-soluble aluminum salt such as aluminum chloride or aluminum sulfate to an aqueous solution of sodium silicate and drying the precipitate, and has a lighter and finer structure than naturally occurring aluminum silicate.

The pesticide solid preparation of the present invention generally comprises (a) acephate, (b) synthetic aluminum silicate and (c).
Although it contains a solid carrier for preparation, synthetic aluminum silicate itself can be used as a solid carrier for preparation. The content of acephate in the agricultural chemical solid preparation of the present invention is generally 0.5 to 99% by weight, preferably 5 to 95% by weight, and the content of synthetic aluminum silicate as a stabilizer stabilizes the acephate. Amount to obtain, usually 1-99
% 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 formulation are usually contained in the agricultural chemical solid formulation of the present invention in an amount of 1 to 90% by weight, preferably 20 to 70% 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 agricultural chemical solid preparation of the present invention may further contain other agricultural chemical active ingredients.

The pesticide solid preparation of the present invention contains (a) acephate, (b) synthetic aluminum silicate, (c) solid carrier for preparation, and if necessary, a surfactant and the like, and mixed with a mixer or the like to prepare an air mill or hammer. Usually, it is crushed with a crusher such as a mill or a centrifugal crusher, and these crushed products are further molded into a granule using a compression molding machine such as a roller compactor, an extrusion granulator, or a tumbling granulator. It is manufactured by the method of.

[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 After mixing 50 parts by weight of acephate and 50 parts by weight of P820 (synthetic aluminum silicate manufactured by Degussa) with a mixer,
Finely pulverize with a centrifugal pulverizer to obtain a wettable powder which is a solid agricultural chemical formulation of the present invention. Formulation Example 2 25 parts by weight of acephate, 5 parts by weight of sodium dodecylbenzenesulfonate, 50 parts by weight of P820 and 20 parts by weight of kaolinite clay were mixed with a mixer, and then finely pulverized with a centrifugal pulverizer to obtain the pesticide solid formulation of the present invention. To obtain a wettable powder.

Formulation Example 3 10 parts by weight of acephate, 5 parts by weight of sodium lauryl sulfate and P82085 parts by weight 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 4 75 parts by weight of acephate, 5 parts by weight of sodium lauryl sulfate and P82020 parts by weight are mixed with 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.

Test Example 1 The wettable powder obtained in the above Preparation Example 1 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 following formula.

[Equation 1] Further, the degradation rate was similarly determined for Comparative Preparation 1 prepared in the same manner as in Preparation Example 1 except that 50 parts by weight of P820 was used instead of 50 parts by weight of Wesalone S (synthetic silicic acid manufactured by Degussa). The results are shown in Table 1.

[Table 1]

Test Example 2 The wettable powder obtained in the above Preparation Example 2 was 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 above formula. Further, the degradation rate was similarly determined for Comparative Preparation 2 prepared in the same manner as in Preparation Example 2 except that 50 parts by weight of P820 was used instead of 50 parts by weight of Carplex 80 (synthetic silicic acid manufactured by Shionogi Pharmaceutical Co., Ltd.). The results are shown in Table 2.

[Table 2]

[0010]

INDUSTRIAL APPLICABILITY According to the present invention, the storage stability of acephate in the solid acephate preparation or the agricultural chemical solid preparation containing acephate is improved by the addition of synthetic aluminum silicate.

Claims (3)

[Claims] 1. A solid agricultural chemical formulation comprising acephate and synthetic aluminum silicate. 2. A method for stabilizing an agricultural chemical solid preparation, which comprises adding synthetic aluminum silicate to the agricultural chemical solid preparation containing acephate. 3. Stabilized acephate with the addition of synthetic aluminum silicate.