JP5686525B2 - Fine particulate herbicide composition - Google Patents

Description

  The present invention is a solid preparation that is sprayed as it is using a spreader without being diluted with water, has a good sprayability under high temperature and high humidity conditions, and has a scattering (drift) during spraying. The present invention relates to a suppressed fine herbicidal composition.

  In recent years, when solid formulations are being sprayed, there is concern about scattering (drift) to the surrounding environment such as other crops and houses and exposure to farm workers. Fine-grained agricultural chemical compositions such as fine granules F (particle size distribution 180 μm to 710 μm), fine granules (particle size distribution 106 μm to 300 μm) and fine granules F (particle size distribution 63 μm to 212 μm) have been developed as few solid preparations I came. These fine granular pesticide compositions have been subjected to many studies exemplified below for the purpose of suppressing the peeling of the agricultural chemical active ingredients from the fine particulate carrier during spraying while maintaining the dispersibility comparable to DL powder. It was.

  In JP-A-49-13338 (Patent Document 1), (a) a non-absorbable or relatively non-absorbable mineral fine powder and (b) an active ingredient (insecticide) spread thereon. , Disinfectant, herbicide, nematicide, and the like) and a vinyl acetate polymer or copolymer. Agricultural and horticultural granule compositions with improved fluidity have been proposed.

  In Japanese Patent Application Laid-Open No. 2003-12406 (Patent Document 2), a solution in which an agrochemical active ingredient that is liquid at room temperature (excluding the insecticide diazinon (generic name)) and an agrochemical active ingredient that is solid at room temperature is dissolved in an organic solvent. Alternatively, the mixture is impregnated and bonded to a non-absorbent granular carrier together with calcined ultrafine amorphous silicon dioxide having an equilibrium water content of 5% or less and an average particle size of 3 μm or less, thereby providing good fluidity and peeling. In addition, there has been proposed an agrochemical granular composition in which there is no dusting due to aging, and peeling of an agrochemical active ingredient is hardly observed even in application using a power spreader, and a simple method for producing the agrochemical granular composition.

  In Japanese Patent Application Laid-Open No. 2003-12423 (Patent Document 3), the insecticide diazinon (generic name) is not oil-absorbed together with calcined ultrafine amorphous silicon dioxide having an equilibrium water content of 5% or less and an average particle size of 3 microns or less. Impregnated pesticidal granular carrier has improved fluidity, no powdering due to peeling, and improved pesticide active ingredient composition with almost no peeling of agrochemical active ingredients even when applied using a power spreader And the simple manufacturing method of this agrochemical granular composition is proposed.

In JP 2009-84183 A (Patent Document 4), a method for producing a pesticide granule or a pesticide granule that performs at least the following (1) to (3) in a mixer (1) Mixing a carrier and a binder liquid Then, a binder layer is formed on the surface of the carrier.
(2) At least a pesticide active ingredient is fixed through the binder layer.
(3) A dehydrating desiccant (such as hemihydrate gypsum) is mixed and dried.
Pesticides with low peeling and scattering properties of active ingredients of agricultural chemicals (general agricultural chemicals such as bactericides, insecticides, insecticidal mixture, herbicides, etc.) without any hot air drying process It describes that it is possible to produce granules or agrochemical powders.

  However, the finely divided pesticide composition is generally sprayed in the summer when it becomes hot and humid, and must be stored under high-temperature and humid conditions until it is sprayed. When stored under such conditions, the decrease in fluidity due to moisture absorption of the finely divided pesticide composition causes poor spraying, resulting in the risk of insufficient biological effects, as well as the burden on the spraying machine and the risk of failure. There is. In addition, even a particulate pesticide composition in which exfoliation of the pesticidal active ingredient is suppressed, exfoliation of the pesticidal active ingredient may not be suppressed in the same way even under high temperature and high humidity conditions, and thus a stable biological effect can be obtained. Whether it is possible is unknown. Furthermore, there is a concern about the scattering (drift) of the fine granular pesticide composition itself. The above-mentioned Patent Documents 1 to 4 do not describe various problems under these high temperature and high humidity conditions.

  Therefore, by a simple and low-cost production method, sprayability is good even under high temperature and high humidity conditions, and it is possible to suppress peeling of the pesticidal active ingredient and scattering of the fine pesticide composition itself even under the same conditions. There is a need for a technique that can produce a stable biological effect.

JP-A-49-13338 JP 2003-12406 A JP 2003-12423 A JP 2009-84183 A

  In view of the conventional drawbacks as described above, the present invention has a good sprayability even under high temperature and high humidity conditions by a simple production method, and the release and solid formulation of agrochemical active ingredients even under the same conditions An object of the present invention is to provide a fine herbicidal composition capable of suppressing the scattering (drift) of itself and exhibiting a stable biological effect, particularly a herbicidal effect.

The present inventors have intensively studied to solve the above problems. As a result, by setting the particle size of the fine pesticide composition to 63 to 710 μm and the apparent specific gravity to 1.0 to 2.0, scattering (drift) of the fine pesticide composition itself is suppressed. I found. Among water-absorbing agents that absorb water by chemical adsorption, in particular, a water-soluble water-absorbing agent having a water solubility at 25 ° C. of 3% or more with respect to 100 g of water is adopted, and a solid binder having a specific volume of 3 ml / g or more. By adopting the present invention, it has been found that among the finely divided agricultural chemical compositions, the finely divided herbicidal composition can maintain even more excellent sprayability even under high temperature and high humidity conditions. It came to be completed.
That is, the gist of the present invention is as follows.
(1) (a) a herbicidal active ingredient, (b) a particulate carrier, (c) a solid binder having a specific volume of 3 ml / g or more, (d) water, and (e) a water absorption mechanism for chemical adsorption with water And a water-soluble water-absorbing agent having a water solubility at 25 ° C. of 3% or more with respect to 100 g of water, and having an apparent specific gravity of 1.0 to 2.0. A particulate herbicidal composition.
(2) The particulate herbicidal composition according to claim 1, wherein the specific volume of the solid binder (c) is 5 ml / g or more and the water-absorbing agent (e) is anhydrous magnesium sulfate. .

  The fine herbicidal composition of the present invention does not require a hot air drying step during production, and thus can be obtained at a low cost by a simple production method. In addition, even when sprayed under high temperature and high humidity conditions, it not only has good sprayability, but also has excellent drift as it can suppress the herbicidal active ingredient peeling from the particulate carrier and the dispersion of the particulate herbicide composition itself. And can provide a stable herbicidal effect.

Hereinafter, the fine herbicidal composition of the present invention will be described in more detail.
<About herbicidal active ingredients>
The herbicidal active ingredient that can be used in the present invention is not particularly limited as long as it is generally used as an agricultural chemical. For example, phenoxy acid type (MCPA thioethyl (S-ethyl = 2- (4-chloro-2- Methylphenoxy) thioacetate), MCPB ethyl (ethyl 2-methyl-4-chlorophenoxybutyrate), etc.), carbamates, acid amides (tenyl chlor (2-chloro-N- (3-methoxy-2-enyl) -2 ′ , 6′-dimethylacetanilide), butachlor (2-chloro-2 ′, 6′-diethyl-N- (butoxymethyl) acetanilide), etc.), acetanilide, urea, sulfonylurea, pyrimidyloxybenzoic acid, triazine (Cimetrine (2-methylthio-4,6-bis (ethylamino) -S-triazine) etc.), diazine System, diazole system (pyrazolate (4- (2,4-dichlorobenzoyl) -1,3-dimethylpyrazol-5-yl-toluene-4-sulfonate), etc.), bipyridylium system, dinitroaniline system, aromatic carboxylic acid system , Imidazolinone, fatty acid, organic phosphorus, amino acid, diphenyl ether (biphenox (methyl 5- (2,4-dichlorophenoxy) -2-nitrobenzoate)), nitrile, cyclohexanedione, phenyl Examples include phthalimide, cineol, indandione, benzofuran, triazolopyrimidine, oxazinone, allyltriazolinone, isourazole, pyrimidinylthiophthalide, triazolinone, inorganic herbicides, biological pesticides.

The herbicidal active ingredient may be used alone or in combination of two or more.
Specific herbicidal active ingredients contained in these include, for example, “Agricultural Chemicals Handbook 2005” (Japan Foundation for Plant Protection, issued on October 11, 2005), “SHIBUYA INDEX 9th Edition” (SHIBUYA INDEX) Research Group, issued on December 15, 2001), “The Pesticide Manual Evention Edition” (published by British Crop Protection Council), and the like.
In addition, as the herbicidal active ingredient used in the present invention, conventionally known herbicidal active ingredients other than those described above are also applied as long as they serve the same purpose as the present invention and are applied as a particulate herbicidal composition. can do.
The amount of the herbicidal active ingredient added is usually 0.01 to 50% by weight, preferably 0.05 to 20% by weight, in the fine herbicidal composition.

<About fine carrier>
Examples of the particulate carrier that can be used in the present invention include clay, calcium carbonate, talc, silica sand, bentonite, pumice, zeolite, sepiolite, diatomaceous earth, and attapulgite.
The fine herbicidal composition of the present invention is generally sprayed by a multi-nose hose equipped with a power spreader. From the viewpoint of biological effect, sprayability, drift, etc., the particle size of the composition is 63-710 μm, apparent The specific gravity is preferably 1.0 to 2.0. More preferably, the particle size is 63 to 300 μm and the apparent specific gravity is 1.4 to 1.8. Although it will not specifically limit if it is a fine particle support | carrier which can adjust the particle size and apparent specific gravity of such a fine particle herbicide composition, Silica sand is especially preferable. Further, there is no problem even if two or more kinds of finely divided carriers are used in combination.
The amount of the finely divided carrier that can be used in the present invention is usually 40.0 to 99.9% by weight, preferably 70.0 to 99.8% by weight, in the fine herbicidal composition.

<About solid binder>
The solid binder that develops adhesive force through the presence of water adheres the herbicidal active ingredient to the surface of the fine particulate carrier, and then removes the water to firmly crosslink the fine particulate carrier and the herbicidal active component, thereby removing the herbicidal activity. Peeling of the component from the finely divided carrier can be suppressed. Therefore, when a liquid binder such as glycerin, polybutene, or liquid paraffin is used, the cross-linked portion of the herbicidal active ingredient and the fine particulate carrier is liquid, resulting in weaker cross-linking compared to the solid binder. It is not sufficient for suppressing drift due to peeling from the fine particulate carrier.

  In addition, from the viewpoint of improving the fluidity of the fine herbicidal composition, the specific volume of the solid binder is essential to be 3 ml / g or more, and more preferably 5 ml / g or more. If the specific volume is less than 3 ml / g, the effect of improving fluidity is insufficient, causing solidification of the preparation after high-temperature and high-humidity storage and poor spraying. If the specific volume is 5 ml / g or more, the herbicidal active ingredient, fine particulate carrier The contact area increases with the fluidity, and the cross-linked portion is strengthened with improved fluidity. The specific volume means a volume (ml) per unit weight (g) and is represented by the following formula.

Solid binders that can be used in the present invention include natural, semi-synthetic and synthetic water-soluble polymers.
For example, natural water-soluble polymers include starch, gum arabic, tragacanth gum, guar gum, mannan, pectin, sodium alginate, sorbitol, locust bean gum, xanthan gum, dextran, curdlan, pullulan, gelatin and casein. .
Examples of the semi-synthetic water-soluble polymer include dextrin, cyclodextrin, soluble starch, pregelatinized starch, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose.
Examples of the synthetic water-soluble polymer include polyvinyl pyrrolidone, polyvinyl alcohol, polyacrylamide, sodium polyacrylate, ethylene-acrylic acid copolymer, polyethylene glycol and polyethylene oxide.
Among these, starch, dextran, dextrin, cyclodextrin, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, and polyethylene oxide are preferable from the viewpoint of suppressing the peeling of the herbicidal active ingredient, and dextrin is particularly preferable. is there.

The solid binder that can be used in the present invention does not require an aqueous solution or water dispersion step, and after mixing the pesticidal active ingredient and the finely divided carrier into powder, adding water and mixing. Sufficient adhesive force can be developed between the pesticidal active ingredient and the finely divided carrier. In addition, solid binders having a specific volume of 3 ml / g or more can be used for formulation as they are, and solid binders having a specific volume of less than 3 ml / g are pulverized by hammer mill, jet pulverization, etc., and the specific volume is 3 ml / g. It can also be adjusted to g or more and used for formulation.
The amount of the solid binder that can be used in the present invention is usually 0.1 to 10% by weight, preferably 0.3 to 5% by weight in the finely divided agrochemical composition. If the amount added is less than 0.1% by weight, drifts caused by the pesticidal active ingredient adhering to the surface of the finely divided pesticide composition easily become a problem, and even if it exceeds 10% by weight, the effect is exhibited. Therefore, if it exceeds 10% by weight, it is disadvantageous in terms of cost.

<About water>
Water is an essential component for the adhesion of the herbicidal active ingredient to the particulate carrier and the formation of a crosslinked part by the solid binder. As described above, the solid binder exhibits adhesive ability in the presence of water, and after the herbicidal active ingredient is adhered to the surface of the fine particulate carrier, a crosslinked portion is formed by removing water. Therefore, in the absence of water, the solid binder does not exhibit adhesive ability and a cross-linked portion is not formed. Therefore, there is a concern about scattering (drift) of the herbicidal active ingredient itself.
In addition, the addition amount of the water which can be used for this invention is 0.1 to 15 weight% normally in a fine granular herbicide composition, Preferably it is 0.3 to 10 weight%. When the addition amount is less than 0.1% by weight, the adhesiveness of the solid binder is insufficient, so that a drift caused by peeling of the herbicidal active ingredient from the fine particulate carrier becomes a problem. Since there is no effect on the herbicidal effect to be produced, if it exceeds 15% by weight, it is disadvantageous in terms of cost.

<About water-soluble water-absorbing agent by chemical adsorption>
In the particulate herbicide composition of the present invention, a water-soluble water-absorbing agent whose water absorption mechanism is chemical adsorption with water and whose water solubility at 25 ° C. is 3% or more with respect to 100 g of water is It is important for simplicity, good sprayability maintenance under high temperature and high humidity conditions, and stable herbicidal effects. That is, at the time of manufacture, the hot air drying step can be omitted by adsorption of free water, which is simple and advantageous in terms of cost. And under high-temperature and high-humidity conditions, it has an action of preventing the fluidity of the composition from being lowered by absorbing moisture, so that it is important for maintaining good sprayability. Further, even if the herbicidal active ingredient is produced in such a form that it is taken into the water-soluble water-absorbing agent, the release of the herbicidal active ingredient is not inhibited due to its water solubility. For this reason, even if dispersion unevenness occurs, a stable herbicidal effect can be expressed. Therefore, the properties required for the water-absorbing agent include that the water-absorbing mechanism is chemical adsorption with water (dehydration by chemical reaction with water), and that the water-absorbing agent does not solidify or is only slightly consolidated after water absorption. When the water absorption mechanism is physically adsorbed, water is adsorbed but exists in a free state, resulting in poor spraying due to reduced fluidity of the formulation. Even if the water-absorbing agent by chemical adsorption is solidified after water absorption, such as hemihydrate gypsum, it will affect the dispersibility. Is disadvantageous. Furthermore, when a water-absorbing agent having a water solubility of less than 3% is used, the release of the herbicidal active ingredient is inhibited and the herbicidal effect is reduced.

Examples of the water-soluble water-absorbing agent by chemical adsorption that can be used in the present invention include organic acid salts and inorganic acid salts.
The salt of the organic acid and the salt of the inorganic acid are not particularly limited as long as they can capture water as crystallization water and may be hydrates. However, an anhydride having a large amount of crystallization water taken in is preferable from the viewpoint of production and cost. .
Organic acid salts include trisodium citrate (anhydrous, anhydrous water solubility: 42.5%), disodium succinate (anhydrous, anhydrous water solubility: 34.9%), potassium sodium tartrate ( Anhydrous, anhydrous water solubility: 64.4%), sodium L-tartrate (anhydrous, anhydrous water solubility: 23.2%), calcium lactate (anhydrous, anhydrous water solubility: 3.5) %), Sodium malate (0.5 hydrate, water solubility of 0.5 hydrate: 63.8%) and the like.

  Examples of inorganic acid salts include calcium chloride (anhydride, monohydrate, dihydrate, tetrahydrate, anhydrous water solubility: 74.5%), magnesium chloride (anhydride, hexahydrate). Water, octahydrate, anhydrous water solubility: 54.3%), sodium pyrophosphate (anhydrous, hexahydrate, 10 hydrate, 16 hydrate, 18 hydrate, anhydrous water) Solubility: 7.1%), aluminum sulfate (anhydride, hexahydrate, 10 hydrate, 16 hydrate, 18 hydrate, anhydride water solubility: 38.5%), ammonium ammonium sulfate ( Anhydrous, anhydrous water solubility: 7.1%, potassium aluminum sulfate (anhydrous, anhydrous water solubility: 7.2%), sodium aluminum sulfate (anhydrous, anhydrous water solubility: 40.8) %), Sodium sulfate (anhydrous, dihydrate, heptahydrate, anhydrous water solubility: 19. %), Magnesium sulfate (anhydrous, monohydrate, hexahydrate, heptahydrate, anhydrous water solubility: 36.4%), sodium phosphate (anhydrous, 0.5 hydrate, Hexahydrate, octahydrate, anhydrous water solubility: 14.5%), disodium hydrogen phosphate (anhydrous, dihydrate, heptahydrate, anhydrous water solubility: 20.6) %), Sodium dihydrogen phosphate (anhydrous, monohydrate, dihydrate, heptahydrate, anhydrous water solubility: 94.2%) and the like.

Among these water-soluble water-absorbing agents by chemical adsorption, anhydrous calcium lactate, anhydrous sodium sulfate, anhydrous aluminum potassium sulfate, anhydrous magnesium sulfate, and anhydrous sodium dihydrogen phosphate are preferred, but the water absorption rate and amount of water absorption, when hydrated In view of shape, fluidity, safety against crop damage, and cost, anhydrous magnesium sulfate is particularly preferable.
The amount of the water-absorbing agent that can be used in the present invention depends on the amount of water added during production, and is the amount that is stoichiometrically adsorbed with water from the viewpoint of simplicity of the production process and sprayability under high temperature and high humidity conditions. It is preferable to add to the above. The content in the fine herbicidal composition is usually 0.1 to 25% by weight, preferably 0.5 to 20% by weight.

<About other ingredients>
In the fine herbicidal composition of the present invention, as an auxiliary agent, in addition to the above essential components, a surfactant, a powdery carrier (white carbon, diatomaceous earth, glassy powder, acidic clay, urea) , Lactose, granulated sugar, etc.), fluidity improver (isopropyl acid phosphate (PAP), etc.), pH adjuster (phosphoric acid, citric acid, etc.) and the like are added within a range not losing the effects of the present invention. be able to.

<About apparent specific gravity>
In the present invention, it is important to adjust the apparent specific gravity of the fine herbicidal composition to 1.0 to 2.0. When the apparent specific gravity of the fine herbicidal composition is less than 1.0, the fine herbicidal composition itself tends to scatter due to the influence of wind and the like. On the other hand, when the apparent specific gravity exceeds 2.0, the volume of the fine herbicide composition becomes small. Therefore, when spraying from a spraying device such as a multi-hose equipped with a power spreader, the fine herbicide The discharge time of the composition is shortened, and problems such as difficulty in uniformly spraying the composition occur.
Therefore, it is essential to adjust the apparent specific gravity to 1.0 to 2.0, more preferably 1.4 to 1.8 from the viewpoint of maintaining the dispersibility and sprayability of the fine herbicidal composition. Is to adjust.
The apparent specific gravity of the fine herbicidal composition was measured by the following method.

(Apparent specific gravity measurement method)
Place a sieve with a diameter of 710 μm with an inner diameter of 200 mm and a depth of 45 mm 20 cm above the top of a 100 mL metal cylindrical container with an inner diameter of 50 mm, put an appropriate amount of the fine herbicidal composition on the sieve, and gently apply with a brush. Fill the metal cylindrical container while dropping. Then, using a slide glass, level the upper part of the metal cylindrical container, remove the excess fine herbicidal composition, measure the weight (Ag) of the contents in the metal cylindrical container, The apparent specific gravity of the fine herbicidal composition was determined from the formula.

<The manufacturing method of a fine granular herbicide composition>
The particulate herbicidal composition of the present invention can be produced by the following steps.
Mixing herbicidal active ingredient, particulate carrier with apparent specific gravity of 1.0-2.0, solid binder that does not require pre-treatment step to make aqueous solution or water dispersion beforehand, and other auxiliary ingredients if necessary Mix in the machine (about 5 minutes to 2 hours), add water and mix for about 5 minutes to 1 hour. Then, after adding a water-soluble water-absorbing agent by chemical adsorption, mixing for about 10 minutes to 1 hour and performing a dehydration step, it is sieved as necessary, and a fine particle having an apparent specific gravity of 1.0 to 2.0 A pesticide composition was obtained.
The agrochemical active component may be a solid component that has been finely divided by Jet pulverization or wet pulverization in advance, and the liquid component may be adsorbed to an oil absorbent or the like.

  In the method for producing a finely divided agrochemical composition of the present invention, a water-absorbing mechanism by chemical adsorption is used, and a water-absorbing agent that does not solidify after water absorption or remains slightly consolidated is used. A crushing step is not required, and since it can be produced with only one mixer, it is a simple production method and is more advantageous than conventional production methods in terms of energy and cost. In addition, for solid binders, sufficient adhesion is exhibited by a simple mixing step with an agrochemical active ingredient, a finely divided carrier and water, and there is no step to make a solid binder into an aqueous solution or water dispersion in advance. This is an abbreviated manufacturing method. Furthermore, the mixer that can be used in the present manufacturing method only needs to be capable of powder mixing and does not require functions such as variable temperature and pulverization. It can be used and is economical. Examples thereof include a Ladige mixer, a high speed mixer, a concrete mixer, a kneader, a ribbon mixer, and a pug mixer.

<Usage aspect of a fine granular herbicide composition>
The particulate herbicide composition produced as described above is sprayed on crops using a multi-hose hose or direct injection pipe equipped with a power spreader, or from the air to crops using an aircraft, a manned helicopter, or a radio control helicopter. It can be used by spraying or by spraying on crops with hand or human power spreader. In addition, it can be used by treating the planting hole or stock of the crop, mixing the soil, treating the soil surface, or treating the seedling box.
In addition, there is no problem even if two or more kinds of the fine herbicidal compositions obtained by the present technology are mixed in advance and then sprayed. Moreover, the application amount per 10 ares of the fine herbicidal composition when spraying to a paddy field using a multi-nose hose or a direct injection tube is usually 0.5 to 5 kg, preferably 1 to 4 kg. The application amount per 10 ares of the fine herbicidal composition when used for horticultural use in crop planting holes or stocks, or when used for soil mixing treatment is usually 0.5 to 50 kg, Preferably it is 1-30 kg.

EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these.
In the following examples and comparative examples, “parts” means all parts by weight.

[Example 1]
Cimetrine (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 93.8 parts, and dextrin (specific volume: 8.9 ml / g) (solid binder) 1.5 The portion was added to the Leedige mixer and then mixed for about 5 minutes. Next, 1.5 parts of water is added to the mixture, mixed for about 15 minutes, and then 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) is added, and about 20 until the fluidity of the mixture becomes good. Mixed for minutes. Thereafter, the mixture was taken out from the Ladige mixer to obtain a fine herbicidal composition.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Example 2]
1.5 parts of simethrin (triazine herbicide), silica sand (particle size: 63 to 300 μm) (fine particulate carrier) 94.7 parts, polyethylene oxide (specific volume: 6.5 ml / g) (solid binder) 0.6 A fine herbicidal composition was obtained in accordance with Example 1 except that 1.5 parts by weight, 1.5 parts of water, and 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.4.

[Example 3]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 91.1 parts, starch (specific volume: 5.9 ml / g) (solid binder) 1.5 parts A fine herbicidal composition was obtained in accordance with Example 1 except that 1.5 parts of water and 4.4 parts of anhydrous calcium lactate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.3.

[Example 4]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 93.4 parts, dextrin (specific volume: 10.5 ml / g) (solid binder) 1.5 parts A fine herbicidal composition was obtained according to Example 1 except that 1.5 parts of water and 2.1 parts of anhydrous aluminum potassium sulfate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

[Example 5]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63 to 300 μm) (fine particulate carrier) 93.8 parts, carboxymethyl cellulose (specific volume: 4.5 ml / g) (solid binder) 1.5 A fine herbicidal composition was obtained in accordance with Example 1 except that 1.5 parts by weight, 1.5 parts of water, and 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.4.

[Example 6]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 93.8 parts, starch (specific volume: 3.6 ml / g) (solid binder) 1.5 parts A fine herbicidal composition was obtained in accordance with Example 1 except that 1.5 parts of water and 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

[Example 7]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 93.9 parts, polyethylene oxide (specific volume: 4.1 ml / g) (solid binder) 0.6 A fine herbicidal composition was obtained in accordance with Example 1 except that 1.5 parts by weight, 1.5 parts water, and 2.5 parts anhydrous calcium chloride (water-soluble water-absorbing agent by chemical adsorption) were used.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Example 8]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 93.8 parts, carboxymethylcellulose (specific volume: 3.3 ml / g) (solid binder) 1.5 Particulate, 1.5 parts of water, and anhydrous sodium dihydrogen phosphate (water-soluble water-absorbing agent by chemical adsorption) 1.7 parts were obtained in accordance with Example 1 to obtain a fine herbicidal composition.
The apparent specific gravity of the obtained fine herbicidal composition was 1.1.

[Example 9]
MCPB ethyl (phenoxy acid herbicide) 1.0 part is absorbed in white carbon (adjuvant) 1.3 part, pumice (particle size: 63-300 μm) (fine particulate carrier) 93.0 parts, starch (specific volume) : 7.2 ml / g) (solid binder) 1.5 parts was added to the Leedige mixer and mixed for about 5 minutes. Next, 1.5 parts of water is added to the mixture, mixed for about 15 minutes, and then 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) is added, and about 20 until the fluidity of the mixture becomes good. Mixed for minutes. Thereafter, the mixture was taken out from the Ladige mixer to obtain a fine herbicidal composition.
The apparent specific gravity of the obtained fine herbicidal composition was 1.4.

[Example 10]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 92.8 parts, dextrin (specific volume: 8.1 ml / g) (solid binder) Finely divided weeding according to Example 9 except that 5 parts, 1.5 parts of water, 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) and 1.5 parts of diatomaceous earth (adjuvant) were used. An agent composition was obtained.
In addition, the apparent specific gravity of the obtained fine herbicidal composition was 1.6.

[Example 11]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 92.6 parts, carboxymethyl cellulose (specific volume: 6.7 ml / g) (solid binder) 1 5 parts, 1.5 parts of water, 2.1 parts of anhydrous aluminum potassium sulfate (water-soluble water-absorbing agent by chemical adsorption), and 1.3 parts of white carbon (adjuvant) according to Example 9 A particulate herbicide composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 1.3.

[Example 12]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, pumice (particle size: 63-300 μm) (fine particulate carrier) 92.0 parts, carboxymethyl cellulose (specific volume: 6.0 ml / g) (solid binder) 1 .5 parts, 1.5 parts of water, 2.5 parts of anhydrous calcium chloride (water-soluble water-absorbing agent by chemical adsorption), and 1.5 parts of diatomaceous earth (adjuvant) according to Example 9 A herbicidal composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 1.1.

[Example 13]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 93.9 parts, polyethylene oxide (specific volume: 4.6 ml / g) (solid binder) 0 .6 parts, water 1.5 parts, anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) 1.7 parts, and white carbon (adjuvant) 1.3 parts fine particles according to Example 9 A herbicidal composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 1.4.

[Example 14]
1. MCPB ethyl (phenoxy acid herbicide) 1.0 part, pumice (particle size: 63-300 μm) (fine particulate carrier) 93.0 parts, dextrin (specific volume: 4.5 ml / g) (solid binder) Finely divided according to Example 9 except that 5 parts, 1.5 parts of water, 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) and 1.3 parts of white carbon (auxiliary agent) were used. A herbicidal composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

[Example 15]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 90.1 parts, dextrin (specific volume: 4.0 ml / g) (solid binder) Finely divided weeding according to Example 9 except that 5 parts, water 1.5 parts, anhydrous calcium lactate (water-soluble water-absorbing agent by chemical adsorption) 4.4 parts, and diatomaceous earth (adjuvant) 1.5 parts An agent composition was obtained.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Example 16]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 93.9 parts, polyethylene oxide (specific volume: 3.2 ml / g) (solid binder) 0 .6 parts, 1.5 parts water, 1.7 parts anhydrous sodium dihydrogen phosphate (water-soluble water-absorbing agent by chemical adsorption) and 1.3 parts white carbon (adjuvant) according to Example 9 As a result, a fine herbicidal composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 1.3.

[Comparative Example 1]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 93.4 parts, dextrin (specific volume: 8.4 ml / g) (solid binder) 1.5 parts A fine herbicidal composition was obtained according to Example 1 except that 1.5 parts of water and 2.1 parts of anhydrous aluminum potassium sulfate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 0.9.

[Comparative Example 2]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 82.7 parts, carboxymethylcellulose (specific volume: 5.7 ml / g) (solid binder) 1.5 A fine herbicidal composition was obtained according to Example 1, except that the amount was 1.5 parts, water, and anhydrous calcium oxalate (water absorbing agent by chemical adsorption) 12.8 parts.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

[Comparative Example 3]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 93.0 parts, starch (specific volume: 6.9 ml / g) (solid binder) 1.5 parts A fine herbicidal composition was obtained according to Example 1 except that 1.5 parts of water and 2.5 parts of white carbon (water absorbing agent by physical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.4.

[Comparative Example 4]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 95.5 parts, and dextrin (specific volume: 5.2 ml / g) (solid binder) 1.5 The portion was added into a Laedige mixer and mixed for about 5 minutes. After adding 1.5 parts of water to this mixture, the mixture kneaded for about 15 minutes was transferred to a fluidized bed dryer and subjected to ventilation drying at 55 ° C. for 30 minutes to obtain a fine herbicidal composition.
The apparent specific gravity of the obtained fine herbicidal composition was 1.3.

[Comparative Example 5]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 95.3 parts, dextrin (specific volume: 7.8 ml / g) (solid binder) 1.5 parts , And 1.7 parts of anhydrous sodium dihydrogen phosphate (water-soluble water-absorbing agent by chemical adsorption) were added to the Laedige mixer and mixed for about 10 minutes to obtain a fine herbicidal composition.
In addition, the apparent specific gravity of the obtained fine herbicidal composition was 1.6.

[Comparative Example 6]
Cimetrin (triazine herbicide) 1.5 parts, pumice (particle size: 63-300 μm) (fine particulate carrier) 94.7 parts, polyethylene oxide (specific volume: 2.6 ml / g) (solid binder) 0.6 A fine herbicidal composition was obtained in accordance with Example 1 except that 1.5 parts by weight, 1.5 parts of water, and 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.4.

[Comparative Example 7]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 95.3 parts, water 1.5 parts, and anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) 1 A fine herbicidal composition was obtained according to Example 1 except that the amount was 7 parts.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Comparative Example 8]
Cimetrin (triazine herbicide) 1.5 parts, silica sand (particle size: 63-300 μm) (fine particulate carrier) 96.3 parts, glycerin (liquid binder) 0.5 parts, and anhydrous sodium dihydrogen phosphate (chemical) 1.7 parts of a water-soluble water-absorbing agent by adsorption) was added to a Laedige mixer and mixed for about 10 minutes to obtain a fine herbicidal composition.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

[Comparative Example 9]
After mixing 1.5 parts of simethrin (triazine herbicide) and 80.5 parts of silica sand (particle size: 63 to 300 μm) (fine particulate carrier) in a Laedige mixer for about 5 minutes, further 10% aqueous polyvinyl alcohol solution (Binder) 3.0 parts was added and mixed for about 15 minutes. After adding 15.0 parts of hemihydrate gypsum (chemical absorption water absorbing agent) to this mixture, mixing was continued for about 15 minutes. As a result, solidified deposits were confirmed inside the mixer. After scraping off the kimono, mixing was restarted to obtain a fine herbicidal composition.
The apparent specific gravity of the obtained fine herbicidal composition was 1.1.

[Comparative Example 10]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, pumice (particle size: 63-300 μm) (microparticulate carrier) 92.8 parts, dextrin (specific volume: 7.2 ml / g) (solid binder) Finely divided weeding according to Example 9 except that 5 parts, 1.5 parts of water, 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) and 1.5 parts of diatomaceous earth (adjuvant) were used. An agent composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 0.9.

[Comparative Example 11]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 87.7 parts, dextrin (specific volume: 6.4 ml / g) (solid binder) Finely divided according to Example 9 except that 5 parts, 1.5 parts of water, 6.8 parts of anhydrous calcium monohydrogen phosphate (water absorption agent by chemical adsorption), and 1.5 parts of diatomaceous earth (adjuvant) were used. A herbicidal composition was obtained.
The apparent specific gravity of the obtained fine herbicidal composition was 1.3.

[Comparative Example 12]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 92.2 parts, starch (specific volume: 6.0 ml / g) (solid binder) A fine herbicidal composition according to Example 9 except that 5 parts, 1.5 parts of water, 2.5 parts of diatomaceous earth (water absorbing agent by physical adsorption) and 1.3 parts of white carbon (auxiliary agent) were used. Got.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Comparative Example 13]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, pumice (particle size: 63-300 μm) (fine particulate carrier) 94.5 parts, carboxymethyl cellulose (specific volume: 6.1 ml / g) (solid binder) 1 A fine herbicidal composition was obtained in accordance with Comparative Example 4 except that .5 parts, 1.5 parts of water, and 1.5 parts of diatomaceous earth (adjuvant) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

[Comparative Example 14]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate support) 92.7 parts, polyethylene oxide (specific volume: 5.3 ml / g) (solid binder) 0 .6 parts, anhydrous calcium lactate (water-soluble water-absorbing agent by chemical adsorption) 4.4 parts, and white carbon (adjuvant) 1.3 parts according to Comparative Example 5, Obtained.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Comparative Example 15]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 93.0 parts, starch (specific volume: 2.4 ml / g) (solid binder) Finely divided according to Example 9 except that 5 parts, 1.5 parts of water, 1.7 parts of anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) and 1.3 parts of white carbon (auxiliary agent) were used. A herbicidal composition was obtained.
In addition, the apparent specific gravity of the obtained fine granular herbicide composition was 1.5.

[Comparative Example 16]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 94.5 parts, water 1.5 parts, anhydrous magnesium sulfate (water-soluble water-absorbing agent by chemical adsorption) A fine herbicidal composition was obtained in accordance with Example 9 except that 1.7 parts and 1.3 parts of white carbon (adjuvant) were used.
In addition, the apparent specific gravity of the obtained fine herbicidal composition was 1.6.

[Comparative Example 17]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, pumice (particle size: 63-300 μm) (fine particulate carrier) 95.4 parts, polybutene (liquid binder) 0.6 part, anhydrous sodium dihydrogen phosphate ( A fine herbicidal composition was obtained in accordance with Comparative Example 8 except that 1.7 parts of water-soluble water-absorbing agent by chemical adsorption) and 1.3 parts of white carbon (adjuvant) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.1.

[Comparative Example 18]
MCPB ethyl (phenoxy acid herbicide) 1.0 part, silica sand (particle size: 63-300 μm) (fine particulate carrier) 79.7 parts, 10% polyvinyl alcohol (liquid binder) 3.0 parts, hemihydrate gypsum ( A fine herbicidal composition was obtained in accordance with Comparative Example 9 except that 15.0 parts of water absorbing agent by chemical adsorption) and 1.3 parts of white carbon (adjuvant) were used.
The apparent specific gravity of the obtained fine herbicidal composition was 1.2.

Next, the usefulness of the fine herbicidal composition of the present invention will be shown by test examples.
In this test, driftability (calculated by exfoliation rate (%) and recovery rate (%)) under conditions exposed to high-temperature and high-humidity conditions, sprayability (confirmation of dischargeability and adhesion to the sprayer visually) And the herbicidal effect (calculated by herbicidal rate (%)).

<Drift test (calculation of peel rate and recovery rate)>
The test was conducted in accordance with the whole farming method (Fine Granule F Physical Standard Test Method, February 20, 1973, stipulated by the All Agriculture and Agricultural Technology Center, Fertilizer and Agricultural Department). After precisely weighing 10 g of the sample composition (fine particulate agricultural chemical composition prepared in Examples 1 to 16 and Comparative Examples 1 to 18) stored at 35 ° C. and 80% humidity for 1 month, a glass filter (Standard 11G-2) ) To make the sample surface a uniform plane. After fixing the glass filter containing the sample and air blowing treatment (air flow 30 L / min, 2 minutes), the sample remaining on the glass filter was collected. The weight (g) and the herbicidal active ingredient amount (active ingredient amount,%) of the sample before and after the blowing treatment were measured, and the recovery rate (%) and peel rate (%) were calculated from the following formulas, respectively. The evaluation criteria are as follows.
Recovery criteria:
“85% or more” has no practical problem.
“Less than 85%” is a practical problem.
“10% or less” has no practical problem.
“Exceeding 10%” has a problem in practical use. The test was carried out in triplicate, and the amount of active ingredients was measured by a high performance liquid chromatography method. The results are shown in Table 1 (Examples) and Table 2 (Comparative Examples).

<Dispersibility test (confirmation of ejectability and adhesion within the machine)>
A midget duster was installed in a greenhouse set at 35 ° C. and a humidity of 80% (installed so that the height of the discharge part from the ground is 1 m). 500 g of a sample composition (fine particulate pesticide composition prepared in Examples 1 to 16 and Comparative Examples 1 to 18) previously stored for one month under the conditions of 35 ° C. and 80% humidity is put into this apparatus. The sprayability of the fine pesticide composition from the midget duster during spraying and the adhesion of the fine pesticide composition to the inside of the sprayer after spraying are visually observed, and the sprayability of each sample composition is as follows: Evaluated. The evaluation criteria are as follows.
Evaluation criteria for ejectability:
“○” is good and has no practical problem.
“△” indicates discharge unevenness and practical problems.
“×” indicates that there is a problem in practical use because it does not discharge the entire amount.
There is no practical problem without "A",
“B” is extremely small and has no practical problem.
“C” is clear and practically problematic,
“D” is a large amount and has a problem in practical use. The results are shown in Table 1 (Examples) and Table 2 (Comparative Examples).

<Nobier herbicidal effect test (confirmation of biological effect)>
This biological test was conducted for the purpose of evaluating the lack of biological effect when spraying unevenness occurred.
Nobies seeds were surface-seeded in Wagner pots (1/6500 are scale), and sample compositions (Examples 1 to 3) so that they became 1.5 kg / 10 ares (corresponding to half-treatment) in midget duster 30 days after sowing. 16, finely divided agricultural chemical compositions prepared in Comparative Examples 1 to 18) were sprayed. The herbicidal effect on Nobies was investigated 30 days after drug treatment, and the herbicidal rate (%) was calculated from the following formula. The evaluation criteria are as follows.
Evaluation criteria for herbicidal rates:
“90% or more” is practically acceptable,
“Less than 90%” is a problem in practical use. The results are shown in Table 1 (Examples) and Table 2 (Comparative Examples).

<Explanation of the table>
(1) Driftability As is clear from Tables 1 and 2, the driftability evaluated from the peeling rate and the recovery rate is affected by the presence or absence of a solid binder, the specific volume, and the apparent specific gravity of the fine herbicidal composition. It was. In Tables 1 and 2, Examples 1-16, which use a solid binder and water and have an apparent specific gravity in the range of 1.0-2.0, and Comparative Examples 2-4, 6, 11-13 and 15, In addition, Comparative Examples 9 and 18 in which polyvinyl alcohol as a solid binder was used as an aqueous solution showed a low peel rate and a high recovery rate, and showed a high drift suppressing effect. In particular, Examples 1, 2, 9, and 10, and Comparative Examples 3 and 12, which use a solid binder having a specific volume of 5 ml / g or more and have an apparent specific gravity of 1.4 to 1.8, have a higher drift suppression effect. showed that. On the other hand, Comparative Examples 1 and 10, which use a solid binder but have an apparent specific gravity of less than 1.0, showed a low peel rate but also a low recovery rate, which was caused by scattering of the fine herbicidal composition itself. I was concerned about drift. Further, Comparative Examples 5 and 14 not using water, Comparative Examples 7 and 16 not using a solid binder, and Comparative Examples 8 and 17 using a liquid binder all have an apparent specific gravity of 1.0 to 2.0. Although the cross-linking between the particulate carrier and the herbicidal active ingredient is weak, the recovery rate is high, but the peeling rate is also high, and there is a concern about drift due to peeling of the herbicidal active ingredient from the particulate carrier. As a result.

(2) Sprayability The sprayability of the fine herbicidal composition under the high-temperature and high-humidity conditions shown in Tables 1 and 2 was affected by the specific volume of the solid binder, the presence / absence of a water-absorbing agent by chemical adsorption, and the type thereof. Examples 1 to 16 and Comparative Examples 1, 2, 5, 10, 11 and 14 using a solid binder having a specific volume of 3 ml / g or more and a water-soluble absorbent by chemical adsorption were subjected to high temperature and high humidity conditions. Even after spraying under the same conditions after storage, the sprayability (dischargeability and adhesion) was satisfactory. In particular, Examples 1-4, 9-12, and Comparative Examples 1, 2, 5, 10, 11 and 14 using a solid binder having a specific volume of 5 ml / g or more and a water-soluble absorbent by chemical adsorption, The results showed excellent results in terms of adhesion within the sprayer after spraying. On the other hand, Comparative Examples 3 and 12 using a water-absorbing agent by physical adsorption, Comparative Examples 4 and 13 not using a water-absorbing agent, and Comparative Examples 9 and 18 using hemihydrate gypsum flowed by storage under high-temperature and high-humidity conditions. As a result, the entire quantity could not be discharged, and a large amount of adhesion was observed in the spreader, resulting in poor spraying. Further, in Comparative Examples 6 and 15 using a solid binder having a specific volume of less than 3 ml / g, although there was a very small amount of adhesion in the spreader, ejection unevenness was observed and spraying was poor.

(3) Nobies Herbicidal Effect The results of the Nobies herbicidal effect test in Tables 1 and 2 were affected by the type of water-absorbing agent by chemical adsorption. Examples 1-16 using a water-soluble water-absorbing agent by chemical adsorption with a solubility at 25 ° C. of 3% or more, and Comparative Examples 1, 5-8, 10 and 14-17, and a water-absorbing agent by physical adsorption were used. Comparative Examples 3 and 12 and Comparative Examples 4 and 13 not using a water-absorbing agent both had good herbicidal rates. On the other hand, Comparative Example 2 using anhydrous calcium oxalate (water solubility: 0.00067%) with low water solubility as a water absorbing agent by chemical adsorption, and anhydrous calcium monohydrogen phosphate (water solubility: 0.0225%) were used. Comparative Example 11 and Comparative Examples 9 and 18 using hemihydrate gypsum (calcium sulfate hemihydrate, water solubility: 0.3%) resulted in poor herbicidal rates.

  From the above, a solid binder having a specific volume of 3 ml / g or more is used, and the water absorption mechanism is chemical adsorption and does not solidify after water absorption, or remains slightly consolidated, and the water solubility at 25 ° C. Using a water-soluble water-absorbing agent having a water content of 3% or more with respect to 100 g of water and an apparent specific gravity of 1.0 to 2.0, the fine herbicidal compositions of Examples 1 to 16 are subjected to high-temperature and high-humidity conditions. Good results were obtained in all of the driftability, sprayability and herbicidal effect. On the other hand, Comparative Examples 1-18 have a problem in any of drift property, dispersibility, and a herbicidal effect. About drift property, although using solid binder, the apparent specific gravity is less than 1.0. In Comparative Examples 1 and 10, there is concern about drift in terms of scattering of the fine herbicidal composition, Comparative Examples 5 and 14 not using water, Comparative Examples 7 and 16 not using a solid binder, and liquid binder In Comparative Examples 8 and 17 used, there was a concern about drift from the viewpoint of exfoliation of the herbicidal active ingredient. Moreover, as for the sprayability under high-temperature and high-humidity conditions, Comparative Examples 3 and 12 using a water absorbing agent by physical adsorption, Comparative Examples 4 and 13 not using a water absorbing agent, and Comparative Example 9 using a hemihydrate gypsum and 18 and Comparative Examples 6 and 15 using a solid binder having a specific volume of less than 3 ml / g were poorly sprayed due to fluidity deterioration due to high temperature and humidity storage. In addition, the Noviet herbicidal effect is a water absorption mechanism by chemical adsorption, but Comparative Examples 2, 9, 11, and 18 using a water-absorbing agent with low water solubility are concerned that the effect is insufficient when spraying unevenness occurs. It was.

  Therefore, while having the simplicity of the production method, the herbicidal active ingredient can be prevented from being peeled off and the fine herbicidal composition can be drifted from the viewpoint of dispersion, and the sprayability can be maintained under high temperature and high humidity conditions. For expression, water is added to the powder mixture of the herbicidal active ingredient, the particulate carrier and the solid binder having a specific volume of 3 ml / g or more, and the water absorption mechanism is a water absorption agent by chemical adsorption with water, and at 25 ° C. It is produced by a step of adding and mixing water-soluble water-absorbing agents having an aqueous solubility of 3% or more with respect to 100 g of water in order, and it is effective means that the apparent specific gravity is 1.0 to 2.0. It is more effective to use anhydrous magnesium sulfate as a water-soluble water-absorbing agent by chemical adsorption and a solid binder having a specific volume of 5 ml / g or more and to adjust the apparent specific gravity to 1.4 to 1.8. It has been found is.

Claims (2)

(A) a herbicidal active ingredient, (b) a particulate carrier, (c) a solid binder selected from natural, semi-synthetic and synthetic water-soluble polymers having a specific volume of 3 ml / g or more, (d A) water, and (e) an organic acid salt and an anhydride of an inorganic acid salt whose water absorption mechanism is chemical adsorption with water and whose water solubility at 25 ° C. is 3% or more with respect to 100 g of water. made water soluble water absorbing agent, a particulate herbicidal compositions apparent specific gravity, characterized in that 1.0 to 2.0, at the time of manufacture of the composition, an aqueous solution of or water solid binder A fine herbicidal composition characterized in that water is added after mixing an agrochemical active ingredient and a finely divided carrier into a powder without going through a dispersion step.   The particulate herbicidal composition according to claim 1, wherein the specific volume of the solid binder (c) is 5 ml / g or more and the water-absorbing agent (e) is anhydrous magnesium sulfate.