JPS59190901A - Production of fine particle preparation f for agricultural purpose - Google Patents

Abstract

PURPOSE:A fine particle preparation for agricultural purpose that is obtained by coating a particle carrier of a mineral not absorbing oil with a fine powder of the carrier using a water-soluble binder and impregnating the coated particles with a liquid agricultural component, thus holding the component uniformly with high stability with passage of time. CONSTITUTION:A mineral not absorbing oil such as silica, pyrophyllite, calcite, talc or olivene is crushed and classified. The particles of 40-200 microns are coated with the same powder of less than 10 micron particle sizes by spraying a slurry of the powder containing 0.1-5%, based on the powder, of a water-soluble binder and dried to give the particle base of 62-210 micron particle sizes and 130-160 microns on the average. The resultant particle base is stirred and an agricultural component is added dropwise to effect impregnation to give the objective particle preparation F. The variation in coating thickness enables the control of the agricultural component to be impregnated without adverse effect on the fluidity on application and pesticidal effect.

Description

[Detailed description of the invention] The present invention relates to a new method for producing fine granules F for agricultural chemicals.

When pesticide powders are sprayed on the ground or in the air, drift (floating up and scattering of powder) occurs, contaminating the entire environment around the sprayed area, so Fine Granules F was developed as a formulation for spraying with minimal drift. Fine grain agent F has a particle size of 62 to 210μ (
J engineering 5250-70 mesh) particles are 90 or more,
It refers to a fine granule containing 5% or less particles of 62 μ (250 mesh) or less, and its manufacturing method includes, for example,
No. 24660 discloses a method of adsorbing agricultural chemical components onto a granular base obtained by coating a non-oil-absorbing granular carrier with a powder carrier having high oil-absorbing power such as hydrated silicic acid or aluminum silicate.

However, this method tends to cause uneven adsorption of pesticide components, and some pesticide components have problems such as poor stability over time.

The method for producing fine granules F of the present invention involves coating the surface of a non-oil-absorbing mineral granular carrier with a non-oil-absorbing mineral powder carrier of 10μ or less using a water-soluble binder to produce a granular base; This is a method of impregnating a liquid agricultural chemical component into the coated non-oil-absorbing mineral powder, and the agricultural chemical component is uniformly retained by capillary action, etc., and has excellent stability over time, and the content of the agricultural chemical component can be adjusted by changing the amount of coating. It is completely adjustable, and has characteristics comparable to conventional products in terms of fluidity during spraying and expression of medicinal efficacy.

As the granular carrier of non-oil-absorbing minerals used in the method of the present invention, for example, silica, phyllite, limestone, melk, olivine, etc., which are completely crushed and sieved and have a particle size of 40 to 200 μm, are used. As the non-oil-absorbing mineral powder carrier, crushed or sieved powders of the above-mentioned minerals can be used, which is economically advantageous. Fine powder with a particle size of 10 μm or less is preferable because it has a large specific surface area and retains pesticide components through capillary action. Non-oil-absorbing mineral powder also has the advantage of less adsorption loss of pesticide components. As the water-soluble binder, for example, polyvinyl alcohol, lignin sulfonate, etc. are used, and during spraying, the binder is dissolved by the moisture on the leaves and leaves, and the agricultural chemical components are all released.

In order to produce fine granules Flc by the method of the present invention, a granular carrier is placed in a transfer fluidized fluidized dryer, and a slurry of powder carrier containing a binder in an amount of 0.1 to 5% based on the powder carrier is sprayed onto the granular carrier. Coat the powder carrier on the surface and dry it.
A granular base having a particle size of 62 to 210μ and an average particle size of 130 to 160μ is produced. A final product (b) is obtained by dropping the liquid agricultural chemical component while stirring the granule base and impregnating it;
can get. The amount of pesticide components retained can be changed arbitrarily by changing the total amount of coating, but the amount of coating is 0.02 to 3.5 times the amount of the granular carrier, and the amount of pesticide components can be retained without impairing fluidity. Component M is usually contained in an amount of 25% or less of the coating amount, and can be contained in an amount of 20q6 or less in the final product.

The agricultural chemical component contained in the fine granules F of the present invention is not particularly limited as long as it is a liquid agricultural chemical component, but examples include 0.0-diethyl 0-(5-phenyl-3-inxazolyl) phosphorothioate (inxathion), 0.0-diethyl 0-(5-phenyl-3-inxazolyl) phosphorothioate (inxathion), 0-dimethyl S
- a liquid organic 11-ion insecticide, such as (1,2-dicarbethoxyethyl)dithiophosphate (Marathon), 0
．． 0-diisopropyl-S-benzylthiophosphate)
Organophosphorus liquid germicidal active ingredients such as (more P) are preferred. If the agricultural chemical raw material is solid, it is dissolved in a suitable organic solvent and impregnated as a liquid, and then the solvent is completely evaporated.

Next, Examples and Test Examples of the present invention will be shown, but the present invention is not limited thereto.

Example 1 Put 600.9' of silica sand (particle size 53 to 200μ, average particle size 117μ) into a transfer fluidized dryer, add polyvinyl alcohol 3.3, F and phyllite powder (particle size 10μ or less, average particle size). A granular base (average particle size: 130 μm) with a silica sand surface coated with phyllite powder was prepared by spraying the slurry containing 16711'l (diameter: 4 μm).

While stirring the granular base, isoxathion raw material (purity 95%) was added dropwise to impregnate the base in an amount equivalent to 36% of the granular base, thereby producing isoxathion fine granules F. As shown in Table 1, the quality of the thus produced fine granule F was examined, and as shown in Table 1, it met the quality standards for the fine granule F.

Table 1 Example 2 While stirring the granular base produced in Example 1, an amount equivalent to 2.3 of the granular base of Marathon drug substance (purity 96%) was added dropwise to impregnate the granular base with Marathon. Fine granule F containing 22
The i-film was manufactured.

Test Example 1 (Relationship between impregnation amount and fluidity) Granular base manufactured in Example 1 (coating rate 0.2
78) 20.9k While stirring, a certain amount of linseed oil was added dropwise to impregnate the mixture, and the fluidity of the resulting fine granules was examined. Flowability is a property necessary to ensure workability and uniform dispersion during dispersion, and is determined by measuring the sliding angle between the brass plate and the fine particles. That is, when impregnated linseed oil is present on the surface of the fine particles, the adhesion to the brass plate increases, resulting in a large sliding angle and poor fluidity.

As shown in Figure 1, the sliding angle measurement results show that the amount of linseed oil impregnated is 1.3 me / 20 g (0,065 m 17 g).
), it can be seen that the slip angle does not increase much and the fluidity is not impaired.

In addition, granular bases with coating ratios of 064 and 1.46 were similarly tested, and the amounts of linseed oil that could be impregnated without impairing fluidity were o, 11sd/7, and 0.135, respectively.
It was 17g. From this, it can be seen that if the total amount of coating is increased, the amount of drug component A impregnated will increase.

Test Example 2 (Stability of Active Ingredients over Time) Inxathion Microgranules F manufactured in Example 1 and Marathon Microgranules F manufactured in Example 2 were heated at 40°C and at a humidity of 80°C.
The stability of the active ingredient over time was investigated by leaving it in a constant temperature room.

As shown in Table 2, the results show that the fine granule F produced by the method of the present invention has superior stability compared to the control fine granule F produced by the method of Japanese Patent Publication No. 49-24660. I understand.

Table 2 Test Example 3 (Insecticidal effect on the larvae of the brown borer moth) Plant height 20 to 25 cm, tip of VC-grown rice plants approximately 7 cm
30 leaf pieces were placed in a Petri dish with a total diameter of 9 cm and placed in a Perger, and a predetermined amount of Isoxathion fine granules F produced in Example 1 was sprinkled on the rice plants using a Belljar duster and left for 1 minute. . After 17 days had passed since hatching, all five of the larvae were released in petri dishes sprayed with the above-mentioned chemicals, and they were kept in a constant temperature room at 25°C.
The mortality rate after 8 hours was investigated. The test was conducted three times per section, and the average value was calculated by considering the bitter insects as dead.

As shown in Table 3, the investigation results show that the microgranules F produced by the method of the present invention exhibit the same medicinal efficacy as the microgranules F produced by the control method of Japanese Patent Publication No. 49-24660.

Table 3

[Brief explanation of the drawing]

Figure 1 shows the amount of linseed oil impregnated and the sliding angle (
(liquidity) relationship. Patent Applicant Kyushu Sankyo Co., Ltd., Director of the Agency of Industrial Science and Technology Agent Osamu Kashi, Patent Attorney Osamu Kashi @ 1 Fig. Linseed Oil Volume (Company) Continued from page 1 72 Inventor Yoshinobu Matsuyuki 1 Kyushu Sankyo, 526 Himekata-cho, Tosu City Applicant: 71 within the Co., Ltd. Person: Kyushu Sankyo Co., Ltd. 526 Himekata-cho, Tosu City, 1-4-

Claims (1)

[Claims] A granular base is produced by coating the surface of a granular carrier of a non-oil-absorbing mineral with a powder carrier of a non-oil-absorbing mineral of 10 μm or less in size with a water-soluble binder, and the granular base is impregnated with a liquid agricultural chemical component. A method for producing fine granules F for agricultural chemicals.