JP2008056588A - Powdery composition containing coated agrochemical - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powdery composition containing a coated agrochemical in which powdery agrochemical is coated with a thermosetting resin, having 10 to 200 μm volume median diameter and having good flowability as a granular powdery material. <P>SOLUTION: This powdery composition consisting substantially of the coated agrochemical in which powdery agrochemical is coated with the thermosetting resin, having 10 to 200 μm volume median diameter and an amorphous synthetic silica fine powder having ≤0.6 g/mL apparent specific gravity is provided by having (100:0.1) to (100:30) range weight ratio of the coated agrochemical to the amorphous synthetic silica fine powder. Preferably, the thermosetting resin is a urethane resin and/or urea resin and the apparent specific gravity of the amorphous synthetic silica is in 0.01 to 0.3 g/mL range. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a powdery composition containing a coated agricultural chemical coated with a thermosetting resin.

  Conventionally, various agrochemical formulations capable of sustained release of agrochemical active compounds have been proposed for the purpose of sustaining medicinal effects, reducing phytotoxicity, and the like, and the average particle diameter in which agrochemical granules containing agrochemical active compounds are coated with a thermosetting resin The average particle size of a coated pesticidal granule composition having a particle size of 0.5 mm or more (see, for example, Patent Document 1) and a liquid hydrophobic core material such as an agrochemical active compound coated with a thermosetting resin is 1 Powdered compositions of ˜50 μm microcapsules are known.

JP-A-11-005704 JP 2002-102680 A

  The present inventor has been studying a coated agrochemical coated with a thermosetting resin. In a coated agrochemical in which a powdered agrochemical is coated with a thermosetting resin, the fluidity is poor, and a container such as a hopper is used. There were cases where bridging occurred during discharge from the pipe and clogging occurred in the piping.

As a result of diligent study, the present inventor blended a specific amorphous synthetic silica fine powder at a specific ratio with a coated agricultural chemical having a volume median diameter of 10 to 200 μm formed by coating a powdery agricultural chemical with a thermosetting resin. It discovered that the fluidity | liquidity as a granular material became favorable for a powdery composition, and came to complete this invention. That is, the present invention includes the following inventions.
[Invention 1]
A coated pesticide having a volume median diameter in the range of 10 to 200 μm formed by coating a powdery pesticide with a thermosetting resin, and amorphous synthetic silica fine powder having an apparent specific gravity of 0.6 g / ml or less. Become
A powdery composition in which the weight ratio of the coated agricultural chemical to the amorphous synthetic silica fine powder is in the range of 100: 0.1 to 100: 30.
[Invention 2]
The powdery composition described in Invention 1, wherein the thermosetting resin is a urethane resin and / or a urea resin [Invention 3]
The powdery composition described in invention 1 or 2, wherein the volume median diameter of the coated agricultural chemical is 20 to 150 μm.
[Invention 4]
The powdery composition according to any one of Inventions 1 to 3, wherein the apparent specific gravity of the amorphous synthetic silica fine powder is in the range of 0.01 to 0.3 g / ml.

  The powdery composition containing the coated agrochemical of the present invention has good fluidity as a granular material, and is less likely to be clogged during transfer between devices during the preparation of the preparation or when the powdered composition is sprayed.

In the powdered composition of the present invention, a coated agricultural chemical (hereinafter referred to as the present coated agricultural chemical) having a volume median diameter of 10 to 200 μm formed by coating a powdered agricultural chemical with a thermosetting resin is a thermosetting resin. Particles of coated agricultural chemicals that hold powdered agricultural chemicals inside the coating, usually particles that have a thermosetting resin coating layer around the core of powdered agricultural chemicals hardened with a thermosetting resin as a binder is there.
In the present invention, the powdery pesticide used in the production of the present coated pesticide may be a powdery pesticide active compound alone, but is usually a powdered composition containing the pesticide active compound and a diluent carrier, preferably A composition substantially comprising an agrochemical active compound and a diluent carrier.
The agrochemical active compound used in the present invention includes an insecticidal compound, a bactericidal compound, a herbicidal compound, an insect growth control compound, a plant growth control compound, etc., which are solid at normal temperature (20 ° C.), preferably solid at 50 ° C. For example, the following compounds can be specifically mentioned.

  Insecticidal compounds include pyrethroid compounds such as deltamethrin, tralomethrin, acrinathrin, and tetramethrin; carbamate compounds such as propoxer, isoprocarb, xylylcarb, metolcarb, XMC, carbaryl, pirimicarb, carbofuran, mesomil, and phenoxycarb; acephate, tetrachlorphone Organophosphorous compounds such as vinphos, dimethylvinphos, pyridafenthion, azinephosethyl, azinephosmethyl; diflubenzuron, chlorfluazuron, lufenuron, hexaflumuron, flufenoxuron, flucycloxuron, cyromazine, diafenthiuron, hexithazox, Novallon, teflubenzuron, triflumuron, 4-chloro-2- (2-chloro-2-methylpro L) -5- (6-Iodo-3-pyridylmethoxy) pyridazin-3 (2H) -one, 1- (2,6-difluorobenzoyl) -3- [2-fluoro-4- (trifluoromethyl) phenyl ] Urea, 1- (2,6-difluorobenzoyl) -3- [2-fluoro-4- (1,1,2,3,3,3-hexafluoropropoxy) phenyl] urea, 2-tert-butylimino- 3-isopropyl-5-phenyl-3,4,5,6-tetrahydro-2H-1,3,5-thiadiazon-4-one, 1- (2,6-difluorobenzoyl) -3- [2-fluoro- Urea compounds such as 4- (1,1,2,2-tetrafluoroethoxy) phenyl] urea; compounds such as imidacloprid, acetamiprid, clothianidin, nitenpyram, diacloden Lonicotyl compounds; cartap, buprofezin, thiocyclam, bensultap, phenoxycarb, phenazaquin, fenpyroximate, pyridaben, hydramethylnon, thiodicarb, chlorfenapyr, fenproximate, pymetrozine, pyrimidifene, tebufenozide, tebufenpyrad, triazamate, indoxamil, suflumectin , Avermectin, boric acid, paradichlorobenzene and the like.

  Bactericidal compounds include benzimidazole compounds such as benomyl, carbendazim, thiabendazole and thiophanate methyl; phenyl carbamate compounds such as dietofencarb; dicarboximide compounds such as procimidone, iprodione and vinclozoline; diniconazole, propenazole, epoxyconazole, Azole compounds such as tebuconazole, difenoconazole, cyproconazole, flusilazole, triadimephone; acylalanine compounds such as metalaxyl; carboxamide compounds such as flametopyl, mepronil, flutlanyl, trifluzamide; tolcrophos phosmethyl, fosetyl aluminum, pyrazophos Organophosphorus compounds; anilinopyrimidines such as pyrimesanil, mepanipyrim, and cyprodinil Compounds; Cyanopyrrole compounds such as fludioxonil and fenpiclonyl; Antibiotics such as blasticidin S, kasugamycin, polyoxin and validamycin; Methoxy acrylate compounds such as azoxystrobin, cresoxime methyl and SSF-126; Chlorotalonyl, manzeb and captan , Folpet, Tricyclazole, Pyroxylone, Probenazole, Fusaride, Simoxanyl, Dimethomorph, CGA245704, Famoxadone, Oxolinic acid, Fluazinam, Ferimzone, Diclocimet, Clotenazone, Isovaradione, Tetrachloroisophthalonitrile, Thiophthalimidooxybisphenoxyarsine, 3 -Iodo-2-propylbutyl carbamate, parahydroxybenzoate, de Sodium mud acetate, and potassium sorbate and the like.

  As herbicidal compounds, triazine compounds such as atrazine and metribudine; urea compounds such as fluometuron and isoproturon; hydroxybenzonitrile compounds such as bromoxynyl and ioxynil; 2,6-dinitroaniline compounds such as pendimesalin and trifluralin Compound; Allyloxyalkanoic acid compound such as 2,4-D, dicamba, fluroxypyr, mecoprop; sulfonylurea compound such as bensulfuron methyl, methurflon methyl, nicosulfuron, primsulfuron methyl, cyclosulfamuron; imazapyr , Imidazolinone compounds such as imazaquin and imazetapyr; Bispyribac Na salt, Bisthiobac Na salt, Acifluorfen Na salt, Sulfentrazone, Paraquat, Flumetram, Trif Sulfurone methyl, phenoxaprop-p-ethyl, diflufenican, norflurazon, isoxaflutol, glufosinate ammunium salt, glyphosate, bentazone, mefenacet, propanyl, fluthiamid, full microlacpentyl, flumioxazine, etc. be able to.

  Examples of the plant growth regulating compound include maleic hydrazide, chlormecat, etephone, gibberellin, mepicut chloride, thiazuron, inavenfide, paclobutrazole, uniconazole and the like. Examples of the insect repellent include 1S, 3R, 4R, 6R-caran-3, 4-diol, dipropyl 2,5-pyridinedicarboxylate and the like.

  In the present invention, when the pesticidal pesticide is a composition containing an pesticidal active compound and a diluted powder, the amount of the pesticidal active compound is usually 1 to 95% by weight, preferably 10 to 90% by weight based on the pesticide. The amount of the diluted powder is usually 5 to 99%, preferably 10 to 90% with respect to the present pesticide.

  Powdered pesticides are usually particles having a volume median diameter of 1 to 100 μm. In the present invention, the volume median diameter of the powdered pesticide can be measured by a laser diffraction particle size measuring instrument such as MASTERSIZER2000 manufactured by MALVERN.

  Examples of the thermosetting resin used in the present invention include urethane resin, urea resin, urethane-urea resin, and epoxy resin. In the present invention, the thermosetting resin is preferably a urethane resin and / or a urea resin, and more preferably a urethane resin.

The urethane resin is a thermosetting resin that uses polyol and polyisocyanate as liquid raw materials. The urethane resin is produced by reacting polyol and polyisocyanate by heating to, for example, 40 to 100 ° C. At that time, if necessary, the reaction may be carried out in the presence of a curing catalyst such as an organic metal or an amine.
Examples of the polyol include condensed polyester polyols, polyether polyols, poly (meth) acrylic acid polyols, lactone polyester polyols, polycarbonate polyols, natural polyols and modified products thereof. The condensed polyester polyol is usually obtained by a condensation reaction between a polyol and a dibasic acid. The polyether polyol is usually obtained by addition polymerization of propylene oxide or ethylene oxide to a polyhydric alcohol or the like. Poly (meth) acrylic acid polyol is usually obtained by condensation reaction of poly (meth) acrylic acid and polyol, condensation reaction of (meth) acrylic acid and polyol, or polymerization reaction of (meth) acrylic acid ester monomer. It is done. The lactone polyester polyol is obtained by ring-opening polymerization of ε-caprolactone using a polyhydric alcohol as an initiator. Polycarbonate polyol is usually obtained by reaction of glycol and carbonate. As polyol, methylene glycol, ethylene glycol, propylene glycol, tetramethylene glycol, hexamethylenediol, trimethylolpropane, polytetramethylene glycol, glycerin, pentaerythritol. , Sorbitol, sucrose, and. These oligomers etc. are mentioned.
Examples of polyisocyanates include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, 4,4-methylenebis (cyclohexyl isocyanate), trimethylhexamethylene diisocyanate, Examples include 1,3- (isocyanatomethyl) cyclohexane, triphenylmethane triisocyanate, tris (isocyanatephenyl) thiophosphate, and mixtures thereof. In addition, it can replace with said polyisocyanate monomer and can also use these modified bodies and oligomers, as long as it has fluidity | liquidity. Examples of modified products include adduct modified products, biuret modified products, isocyanurate modified products, block modified products, prepolymer modified products, and dimerized modified products. A polymethylene polyphenyl isocyanate (polymeric MDI) obtained by phosgenating a polyamine through condensation of aniline and formalin is preferable in terms of easy reaction control and low workability and excellent workability.
Curing catalysts used as necessary include organic metals such as dibutyltin diacetate, dibutyltin dichloride, dibutyltin dilaurate, dibutylthiostannic acid, stannous octylate, di-n-octyltin dilaurate, triethylenediamine, N-methyl Morpholine, N, N-dimethyldidodecylamine, N-dodecylmorpholine, N, N-dimethylcyclohexylamine, N-ethylmorpholine, dimethylethanolamine, N, N-dimethylbenzylamine, 1,8-diazabicyclo (5,4 , 0) Undecene-7, isopropyl titanate, tetrabutyl titanate, oxyisopropyl vanadate, n-propyl zirconate, 1,4-diazabicyclo [2,2,2] octane, and the like. Polyisocyanate and polyol, which are raw materials for urethane resins, are usually used alone.
In the present invention, the viscosity of the polyol which is a raw material of the urethane resin is preferably 1000 mPa · s or less, more preferably 800 mPa · s or less (B-type viscometer, 25 ° C., 12 rotations), and the viscosity of the polyisocyanate is 300 mPa · s. s or less, more preferably 200 mPa · s or less (B-type viscometer, 25 ° C., 12 rotations).

The urea resin is a thermosetting resin using polyamine and polyisocyanate as liquid raw materials.
Examples of the polyisocyanate include the aforementioned polyisocyanates. Examples of the polyamine include diethylenetriamine and triethylenetetraamine.
The urethane-urea resin is a thermosetting resin that uses polyisocyanate, polyol, and polyamine as liquid raw materials.

In the present invention, the method for producing the coated agricultural chemical will be described below by taking as an example the case where the thermosetting resin is a urethane resin.
This coated agricultural chemical in which the thermosetting resin is a urethane resin is usually (1) a step of mixing a powdered agricultural chemical and a polyol, (2) a step of adding a polyisocyanate to the mixture obtained in the previous step, (3 ) Reacting polyol and polyisocyanate to produce a thermosetting resin, thereby obtaining an agglomerate obtained by solidifying the powdered agricultural chemical with urethane resin; and (4) the powdered agricultural chemical obtained in the previous step. Adding a polyol and a polyisocyanate to the agglomerates simultaneously or sequentially, reacting the polyol and the polyisocyanate, and coating the agglomerates with a urethane resin. In the step (1), the polyol is usually added to the powdered pesticide that is in a fluidized or rolling state in the container, and the powdered pesticide and the polyol are mixed in the container. In step (2), polyisocyanate is usually added to the mixture obtained in the previous step, which is in a fluidized or rolling state in the container. In the step (3), the powder obtained by reacting the polyol and the polyisocyanate to cure the urethane resin while usually giving an appropriate shearing force to the mixture obtained in the previous step with a rotating blade or the like. Agrochemicals obtain agglomerates with urethane resin interposed. In addition, when there is little quantity of the urethane resin added with respect to the quantity of powdery pesticide, appropriate process (1)-(3) is repeated and an aggregate is obtained. Next, in step (4), the polyol and polyisocyanate are usually added simultaneously or sequentially while the agglomerate obtained in the previous step flows or rolls in the container, and the resulting mixture is appropriately mixed with a rotating blade or the like. The polyol and polyisocyanate are reacted while applying a sufficient shearing force, and the aggregate is coated with a urethane resin. In addition, step (4) is repeated a plurality of times as necessary until a film having an appropriate thickness of urethane resin is obtained.

In the method for producing the present coated agricultural chemical, the container for keeping the powdered agricultural chemical in a fluidized or rolling state in the step (1) or the like is a pan-shaped or drum-shaped container equipped with an appropriate stirring means. Is mentioned. Process (1)-(4) is 0-100 degreeC normally, Preferably it is performed in 10-80 degreeC nitrogen atmosphere. In the step (3), the time until the urethane resin is cured varies depending on the operating temperature, the types of polyol and polyisocyanate, the presence or absence of a curing catalyst, and the like. In the step (3), the shear force by rotating blades or the like is applied to the mixture of the powdered agricultural chemical and the uncured urethane resin to such an extent that the powdered agricultural chemical generates an aggregate having an appropriate particle size through the urethane resin. However, the specific speed of the tip of the rotating blade is 50 to 3000 m / min, preferably 100 to 2000 m / min, more preferably 200 to 1000 m / min.
The total amount of polyol and polyisocyanate added in one operation of step (1) and step (2) or step (4), that is, the amount of uncured urethane resin is the type of urethane resin, operation Although it can be changed depending on conditions such as temperature and equipment to be used, it is usually 0.3 to 15 parts by weight, preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of powdered pesticide. is there.
As a specific container that can be used in the production method of the present invention, as a device in which particles cause a circular motion along the outer periphery of the container, a Seigin Corporation Newgra machine can be cited, and a low-speed rotating agitator in the mixer Fukae Pautech Co., Ltd. high-speed mixers and high-flex glals are examples of devices that are equipped with a high-speed rotating chopper on the side surface and mix, disperse and shear the input raw materials in a short time by the action of both blades. Furthermore, as a device having the same performance, a high speed mixer manufactured by Freund Sangyo Co., Ltd., a vertical granulator manufactured by Pou Lec Co., Ltd., and a new speed mill manufactured by Okada Seiko Co., Ltd. can be exemplified. For example, a device described in JP-A-9-75703 can be specifically mentioned.

In the present coated agricultural chemical, the amount of the thermosetting resin is usually 5 to 150 parts by weight, preferably 10 to 100 parts by weight, and more preferably 20 to 80 parts by weight with respect to 100 parts by weight of the powdered agricultural chemical.
In the present invention, the coated pesticide is a powder with a volume median diameter of 10 to 200 μm, preferably a powder with a volume median diameter of 20 to 150 μm, more preferably 30 to 100 μm. The volume median diameter of this coated pesticide can be measured with a laser diffraction particle size measuring machine such as MASTERSIZER2000 manufactured by MALVERN.
The shape of the coated pesticide is generally spherical, and the apparent specific gravity of the coated pesticide is preferably 1.0 g / ml or less, more preferably 0.6 g / ml or less.

As the amorphous synthetic silica fine powder (hereinafter referred to as the present synthetic silica) having an apparent specific gravity of 0.6 g / ml or less in the powdery composition of the present invention, a wet method silica (for example, a precipitation method) is used depending on its production method. Silica, gel method silica, sol method silica) and fumed silica (so-called pyrolysis method silica) are broadly classified, and in the present invention, the synthetic silica may be any silica.
Precipitated silica is produced through a process of filtration, washing with water, drying, pulverization, and classification after allowing silica silicate and sulfuric acid to react under alkaline conditions to aggregate and settle the silica particles that have grown. Specific examples of the precipitated silica include nip seal (manufactured by Tosoh silica), Tokuseal (manufactured by Tokuyama), and carplex (excluding BS type; manufactured by Shionogi).
Gel silica is produced by reacting sodium silicate and sulfuric acid under acidic conditions. By reacting under acidic conditions, fine silica particles dissolve during aging, clear primary particles disappear, and relatively hard aggregated particles having an internal void structure are obtained. Specific examples of the gel method silica include nip gel (manufactured by Tosoh silica), syloid (manufactured by Grace Japan), silo jet (manufactured by Grace Japan), and carplex BS type (manufactured by Shionogi).
Fumed silica is generally produced by flame hydrolysis. Specifically, silicon tetrachloride is produced by burning with hydrogen and oxygen. Further, instead of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane may be used alone or mixed with silicon tetrachloride. Specific examples of the pyrogenic silica include Aerosil (manufactured by Nippon Aerosil) and Leolosil (manufactured by Tokuyama).

The synthetic silica preferably has a volume median diameter of primary particles or a volume median diameter of aggregated particles (secondary particles) in the following range. That is, the volume median diameter of the primary particles is 500 nm or less, more preferably 0.1 to 50 nm, and the volume median diameter of the aggregated particles (secondary particles) is 100 μm or less, more preferably 0.01 to 50 μm. It is a range. The particle diameter of the primary particles can be measured by a microscopic method such as an operation electron microscope (SEM) or a transmission electron microscope (TEM). The particle diameter of the aggregated particles can be measured with a laser diffraction particle size measuring machine such as MASTERSIZER2000 manufactured by MALVERN.
Further, the synthetic silica usually has a specific surface area of 1-1000 m ² / g, preferably 10-700 m ² / g. The specific surface area of this synthetic silica is, for example, the BET method (adsorbed area is known on the powder particle surface, for example, an inert gas molecule such as nitrogen is adsorbed at the temperature of liquid nitrogen, and the ratio of the sample is calculated from the amount. It can be measured by a method for determining the surface area).

The synthetic silica has an apparent specific gravity of 0.6 g / ml or less, but preferably has an apparent specific gravity in the range of 0.01 to 0.3 g / ml. In the present invention, the apparent specific gravity is measured according to the “physical test method” of the Ministry of Agriculture and Forestry Notification (Ministry of Agriculture and Forestry Notification No. 71 on February 3, 1960). Specifically, for example, the measurement is performed by the following method.
A standard sieve (aperture is 0.175 mm) is placed on a 100 ml metal cylindrical container having a diameter of 50 mm so that the distance between the sieve mesh and the upper edge of the container is kept at 20 cm. Sift the measurement sample and fill the container. Immediately scrape off the excess with a slide glass, weigh and determine the weight (g) of the contents, and calculate the apparent specific gravity from the following formula.
Apparent specific gravity (g / ml) = weight of content (g) / 100 (ml)

In the powdery composition of the present invention, the weight ratio of the coated agricultural chemical to the synthetic silica is in the range of 100: 0.1 to 100: 30, preferably in the range of 100: 0.2 to 100: 20. More preferably, it is the range of 100: 0.5-100: 10.
The powdery composition of the present invention is a powdery composition consisting essentially of the coated agricultural chemical and the synthetic silica, but in an amount that does not impair the fluidity of the powdered composition, a surfactant, a stabilizer, A colorant or the like may be included.
Examples of the surfactant that can be used in the present invention include polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene lanolin alcohol, polyoxyethylene alkylphenol formalin condensate, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene Ethylene glyceryl mono fatty acid ester, polyoxypropylene glycol mono fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene castor oil derivative, polyoxyethylene fatty acid ester, higher fatty acid glycerin ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxy Ethylene polyoxypropylene block polymer, polyoxyethylene fatty acid amide, alkylolamide, Nonionic surfactant such as reoxyethylene alkylamine; alkylamine hydrochloride such as dodecylamine hydrochloride, dodecyltrimethylammonium salt, alkyldimethylbenzylammonium salt, alkylpyridinium salt, alkylisoquinolinium salt, dialkylmorpholinium salt Cationic surfactants such as alkyl quaternary ammonium salts, benzethonium chloride, polyalkylvinylpyridinium salts, etc .; sodium fatty acids such as sodium palmitate, sodium ether carboxylates such as sodium polyoxyethylene lauryl ether carboxylate, sodium lauroyl sarcosine , Amino acid condensates of higher fatty acids such as sodium N-lauroyl glutamate, higher alkyl sulfonates, laurate sulfonates, etc. Higher fatty acid ester sulfonates, dioctylsulfosuccinate dialkylsulfosuccinates, higher fatty acid amide sulfonates such as oleic acid amide sulfonic acid, alkylaryl sulfonates such as sodium dodecylbenzenesulfonate, diisopropylnaphthalene sulfonate , Formalin condensates of alkyl aryl sulfonates, higher alcohol sulfates such as pentadecane-2-sulfate, polyoxyethylene alkyl phosphates such as dipolyoxyethylene dodecyl ether phosphate, styrene-maleic acid copolymers Anionic surfactants such as: N-laurylalanine, N, N, N-trimethylaminopropionic acid, N, N, N-trihydroxyethylaminopropionic acid, N-hexyleu N, N -Amphoteric surfactants such as dimethylaminoacetic acid, 1- (2-carboxyethyl) pyrimidinium betaine, and lecithin. When the surfactant is contained, the content thereof is usually 0.1 to 5% by weight, preferably 0.1 to 3% by weight, in the granular agrochemical composition of the present invention.

  Examples of the stabilizer that can be used in the present invention include phenolic antioxidants, amine-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, ultraviolet absorbers, epoxidized soybean oil, and epoxidized linseed. Examples include oils, epoxidized vegetable oils such as epoxidized rapeseed oil, isopropyl acid phosphate, liquid paraffin, and ethylene glycol. When it contains a stabilizer, the content thereof is usually 0.01 to 5% by weight, preferably 0.01 to 3% by weight, in the granular agrochemical composition of the present invention.

  Examples of the colorant that can be used in the present invention include rhodamines such as rhodamine B and solar rhodamine, and dyes such as yellow No. 4, blue No. 1, red No. 2, and the like. When it contains a colorant, its content is usually 0.01 to 5% by weight in the granular agrochemical composition of the present invention.

The powdery composition of the present invention can be easily prepared by mixing the coated agricultural chemical and the synthetic silica in a container equipped with stirring means. As a container equipped with a stirring means, for example, the container used in the method for producing the present coated agricultural chemical can be used, and when the coated agricultural chemical is produced, after the thermosetting resin coating is completely cured, A predetermined amount of the present synthetic silica can be added and mixed to prepare the powdery composition of the present invention.
The powdered composition of the present invention obtained by uniformly blending a predetermined amount of the present synthetic silica with the present coated pesticide has good fluidity as a granular material, and for example, produces this coated pesticide. It is easy to discharge from a stirrer used at the time, and bridging hardly occurs at the time of discharging from a container such as a hopper. Moreover, also when spraying the powdery composition of this invention directly with respect to the pest which should be controlled, or the plant and soil which should be protected, normal powder sprayers, such as a power duster, can be used. Moreover, the powdery composition of this invention can also be used by mixing with the agrochemical active compound different from the agrochemical active compound contained in this coated agrochemical as needed.

  The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

Reference Example 1 (Preparation of this coated pesticide 1)
-Preparation of powdery pesticide 1 70.0 parts by weight of (E) -1- (2-chloro-1,3-thiazol-5-ylmethyl) -3-methyl-2-nitroguanidine (generic name: clothianidin) and (E) with 30.0 parts by weight of Katsuyama Clay S (manufactured by Katsuyama Mining) uniformly mixed and pulverized in a centrifugal crusher to a volume median diameter of 15.0 μm (Malverter MASTERSIZER2000) A powdery pesticide containing -1- (2-chloro-1,3-thiazol-5-ylmethyl) -3-methyl-2-nitroguanidine (hereinafter referred to as powdered pesticide 1) was obtained.
-Preparation of polyol premix 1 56.1 parts by weight of Sumifene TM (branched polyether polyol made by Sumika Bayer Urethane), 42.3 parts by weight of Sumifene 1600U (linear polyether polyol made by Sumika Bayer Urethane), And 1.6 parts by weight of 2,4,6-tris (dimethylaminomethyl) phenol (manufactured by Kayaku Akzo) are uniformly mixed, and a liquid mixture of polyol and catalyst (hereinafter referred to as polyol premix 1). Got. The viscosity of the polyol premix 1 was 364 m · Pa (B-type viscometer, 25 ° C., 12 revolutions, rotor No. 1).
・ Preparation of this coated pesticide 1 High-speed mixer device (LFS-GS-1J type, manufactured by Fukae Pautech Co., Ltd .; agitator blade and round plate type with a vertical line passing through the center of the bottom of the round plate type container as the rotation axis 100 parts by weight of powdered pesticide 1 is placed in a container of a chopper blade having a horizontal line passing through the side surface of the container portion as a rotation axis, and the agitator blade (rotation speed: 850 rpm) and chopper blade of the device (Rotation speed: 3500 rpm) was rotated. Next, 1.86 parts by weight of polyol premix 1 was added while the mixing container was heated and the product temperature of the powdered pesticide 1 was maintained at 75 ± 5 ° C. It was observed that the polyol premix 1 was wetted by the powdered pesticide 1. Three minutes later, while maintaining the product temperature at 75 ± 5 ° C., 1.14 parts by weight of Sumijoule 44V10 (polymethylene polyphenyl polyisocyanate made by Sumika Bayer Urethane, viscosity 130 m · Pa (25 ° C.)) was added. . Immediately after the addition, a thickening phenomenon was confirmed, after which the viscosity decreased and the curing of the polyurethane resin was observed (corresponding to 3.0 parts by weight of polyurethane resin with respect to 100 parts by weight of powdered agricultural chemical 1). . After 5 minutes, the following operation was repeated 19 times while maintaining the product temperature at 75 ± 5 ° C.
Add 1.86 parts by weight of polyol premix 1-> wait for 3 minutes-> add 1.14 parts by weight of Sumidre 44V10-> wait for 5 minutes.
During the above operation, the high-speed mixer device continued stirring and mixing with shearing force under the same conditions.
A total of 60 parts by weight of polyurethane resin raw material was added to 100 parts by weight of powdered pesticide 1. Cool the mixing container, this coated pesticide 1 (number of urethane resin raw material addition: 20 times, urethane raw material addition amount per time: 3.0 parts by weight, urethane resin raw material total addition amount: 60 parts by weight, volume median diameter : 75 μm, apparent specific gravity: 0.41 g / ml).

Reference Example 2 (Preparation of this coated pesticide 2)
-Preparation of powdery pesticide 2 45.5 parts by weight of 5-chloro-N- (1,3-dihydro-1,1,3-trimethyl-4-isobenzofuranyl) -1,3-dimethylpyrazole-4 -Carboxamide (generic name: Frametopil), 9 parts by weight Toxeal GU-N (water-containing amorphous silicon dioxide manufactured by Tokuyama Corporation) and 45.5 parts by weight Bentonite Fuji Mark (manufactured by Hojun Co., Ltd.) were mixed uniformly. The whole volume was pulverized by a centrifugal pulverizer, and 5-chloro-N- (1,3-dihydro-1,1,3-trimethyl-4-isobenzo) having a volume median diameter of 5.0 μm (MASTERSIZER2000 manufactured by MALVERN). A powdery pesticide containing furanyl) -1,3-dimethylpyrazole-4-carboxamide (hereinafter referred to as powdered pesticide 2) was obtained.
・ Preparation of this coated pesticide 2 High-speed mixer device (LFS-GS-1J type, manufactured by Fukae Pautech Co., Ltd .; agitator blade and round plate type with a vertical line passing through the center of the bottom of the round dish type container as the rotation axis 100 parts by weight of powdered pesticide 2 is charged in a container of a chopper blade having a horizontal axis passing through the side of the container portion as a rotation axis, and the agitator blade (rotation speed: 850 rpm) and chopper blade of the device (Rotation speed: 3500 rpm) was rotated. Next, 1.86 parts by weight of the polyol premix 1 was added while the mixing container was heated and the product temperature of the powdered pesticide 2 was maintained at 75 ± 5 ° C. It was observed that the polyol premix 1 was wetted by the powdered pesticide 2. Three minutes later, while maintaining the product temperature at 75 ± 5 ° C., 1.14 parts by weight of Sumijoule 44V10 (polymethylene polyphenyl polyisocyanate made by Sumika Bayer Urethane, viscosity 130 m · Pa (25 ° C.)) was added. . Immediately after the addition, a thickening phenomenon was confirmed, after which the viscosity decreased and the curing of the polyurethane resin was observed (corresponding to 3.0 parts by weight of the polyurethane resin with respect to 100 parts by weight of the agricultural chemical bulk powder). After 5 minutes, the following operation was repeated 6 times while maintaining the product temperature at 75 ± 5 ° C.
Add 1.86 parts by weight of polyol premix 1-> wait for 3 minutes-> add 1.14 parts by weight of Sumidre 44V10-> wait for 5 minutes.
During the above operation, the high-speed mixer device continued stirring and mixing with shearing force under the same conditions.
A total of 21 parts by weight of polyurethane resin raw material was added to 100 parts by weight of powdered pesticide 2. Cool the mixing container, this coated pesticide 2 (urethane resin raw material addition frequency: 7 times, urethane raw material addition amount per time: 3.0 parts by weight, urethane resin raw material total addition amount: 21 parts by weight, volume median diameter : 40 μm, apparent specific gravity: 0.37 g / ml).

Reference Example 3 (Preparation of this coated pesticide 3)
Preparation of powdered pesticide 3 65 parts by weight of (E) -N- (6-chloro-3-pyridylmethyl) -N-ethyl-N′-methyl-2-nitrovinylidenediamine (generic name: nitenpyram) and 35 Part by weight of Katsumiyama clay S (Kaolin clay: manufactured by Katsumiyama Mining Co., Ltd.) is mixed evenly, and all of the mixture is pulverized with a centrifugal pulverizer, and the volume median diameter is 16.0 μm (MASTERVERSER 2000 manufactured by MALVERN). (E) -N- (6-Chloro-3-pyridylmethyl) -N-ethyl-N′-methyl-2-nitrovinylidenediamine-containing powdered pesticide (hereinafter referred to as powdered pesticide 3). Obtained.
・ Preparation of this coated pesticide 3 High-speed mixer device (LFS-GS-1J type, manufactured by Fukae Pautech Co., Ltd .; agitator blade and round plate type with a vertical line passing through the center of the bottom of the round plate type container as the rotation axis 100 parts by weight of powdered pesticide 3 is charged into a container of a device having a chopper blade having a horizontal line passing through the side of the container as a rotation axis, and the agitator blade (rotation speed: 1800 rpm) and chopper blade of the device. (Rotation speed: 2000 rpm) was rotated. Next, the mixing container was heated, and 1.55 parts by weight of the polyol premix 1 was added while maintaining the product temperature of the powdered pesticide 3 at 75 ± 5 ° C. It was observed that the polyol premix 1 was wetted by the powdered pesticide 3. Three minutes later, while maintaining the product temperature at 75 ± 5 ° C., 0.95 parts by weight of Sumijoule 44V10 (polymethylene polyphenyl polyisocyanate made by Sumika Bayer Urethane, viscosity 130 m · Pa (25 ° C.)) was added. . Immediately after the addition, a thickening phenomenon was confirmed, after which the viscosity decreased and hardening of the polyurethane resin was observed (corresponding to 2.5 parts by weight of polyurethane resin with respect to 100 parts by weight of agricultural chemical bulk powder). After 5 minutes, the following operation was repeated 19 times while maintaining the product temperature at 75 ± 5 ° C.
Add 1.55 parts by weight of polyol premix 1-> wait for 3 minutes-> add 0.95 parts by weight of Sumidre 44V10-> wait for 5 minutes.
During the above operation, the high-speed mixer device continued stirring and mixing with shearing force under the same conditions.
A total of 50 parts by weight of the polyurethane resin raw material was added to 100 parts by weight of the powdered pesticide 3. Cool the mixing container, this coated pesticide 3 (urethane resin raw material addition frequency: 20 times, urethane raw material addition amount per time: 2.5 parts by weight, urethane resin raw material total addition amount: 50 parts by weight, volume median diameter : 53 μm).

Production Examples 1-7 and Comparative Examples 1-3 (Preparation of powdered composition)
The coated pesticide 1 prepared in Reference Example 1 and the fine powder described in Table 1 below were mixed at a weight ratio described in Table 1 with a high-speed mixer device (LFS-GS-1J type manufactured by Fukae Pautech Co., Ltd.). The agitator blade (rotation number: 850 rpm) and chopper blade (rotation number: 3500 rpm) of the apparatus were rotated for 5 minutes, and stirred and mixed to prepare a powdery composition.
Production Examples 8 and 9 (Preparation of powder composition)
The coated pesticide 2 prepared in Reference Example 2 and the fine powder described in Table 1 in the following table were mixed at a weight ratio described in Table 1 with a high-speed mixer device (LFS-GS-1J type manufactured by Fukae Pautech Co., Ltd.). ), The agitator blade (rotation speed: 850 rpm) and chopper blade (rotation speed: 3500 rpm) of the apparatus were rotated for 5 minutes, and stirred and mixed to prepare a powdery composition.

*1：トクシールGU-N（株式会社トクヤマ製）
*2：アエロジル２００（日本アエロジル製）
*3：勝光山クレーS（含水アルミニウム珪酸塩；勝光山鉱業所製）

* 1: Tokuseal GU-N (manufactured by Tokuyama Corporation)
* 2: Aerosil 200 (manufactured by Nippon Aerosil)
* 3: Katsumitsu clay S (hydrous aluminum silicate; manufactured by Katsuyama mining)

Next, the fluidity of the coated agricultural chemical composition prepared above was evaluated by the following test method. The results of each test are listed in Table 2.
The test was performed using a powder tester PT-D type (manufactured by Hosokawa Micron).
Test Example 1 (Angle of repose)
A table (for repose angle measurement) was installed on the sample stage, and a funnel was installed above the table so that the funnel tip was within 5 mm of the table. The sample was placed in a standard sieve having an opening of 0.710 mm, and the sample that passed through the sieve was placed in the funnel. Sieve was started, and when the sample that passed through began to spill from the table and the angle of repose became constant, the sieve was stopped, and the angle of repose of the powder was measured using a protractor.
Test Example 2 (Spatula angle)
A bat was placed on the spatula angle measurement platform, and samples were added until the spatula was hidden. The elevator was gently lowered, and the inclination angle of the side surface of the sample deposited on the spatula was measured (inclination angle 1). Next, an impact was applied to the spatula using the attached bell, and the tilt angle of the side surface of the sample deposited on the spatula after that was measured (tilt angle 2). The average value of the inclination angle 1 and the inclination angle 2 was defined as a spatula angle.

The powdery composition of the present invention has good fluidity as a powder and is useful as a composition containing a coated agricultural chemical obtained by coating a powdered agricultural chemical with a thermosetting resin.

Claims (4)

A coated pesticide having a volume median diameter in the range of 10 to 200 μm formed by coating a powdery pesticide with a thermosetting resin, and amorphous synthetic silica fine powder having an apparent specific gravity of 0.6 g / ml or less. Become
A powdery composition in which the weight ratio of the coated agricultural chemical to the amorphous synthetic silica fine powder is in the range of 100: 0.1 to 100: 30. 2. The powdery composition according to claim 1, wherein the thermosetting resin is a urethane resin and / or a urea resin. The powdery composition according to claim 1 or 2, wherein the volume median diameter of the coated agricultural chemical is 20 to 150 µm. The powdery composition according to any one of claims 1 to 3, wherein the apparent specific gravity of the amorphous synthetic silica fine powder is in the range of 0.01 to 0.3 g / ml.