JP4561941B2 - Suspension composition and spraying method - Google Patents

Description

【００５２】
表１に示した比重１未満の固体物質の平均粒子径は、以下の方法により測定した値である。POEアルキルアリールエーテルの１％水溶液１００ｍｌに比重１未満の固体物質１ｇを入れ、超音波をかけながら３０分撹拌し粒子を分散させる。コールターＬＳ１３０型レーザー式粒径測定機（ベックマン・コールター（株）製）にて、その分散液を速やかに測定し、粒子の体積中位径を求め平均粒子径とした。
【００５３】
比重１未満の固体物質の比重は、ピクノメーター法（ＪＩＳ−Ｚ８８０７）により測定した。
【００５４】
〔実施例１〜７〕
ハロスルフロンメチル（一般名）をあらかじめジェットオーマイザー[(株) セイシン企業製] で微粉砕した。次いでその粉砕物と、表２記載の界面活性剤、比重１未満の固体物質、その他の補助剤および分散媒を攪拌混合して本発明の懸濁組成物を得た。
【００５５】
〔比較例１〕
ハロスルフロンメチルをあらかじめジェットオーマイザー[(株) セイシン企業製] で微粉砕した。次いでその粉砕物と、表２記載の界面活性剤、その他の補助剤および分散媒を撹拌混合して懸濁組成物を得た。
【００５６】
〔比較例２〜６〕
ハロスルフロンメチルをあらかじめジェットオーマイザー[(株) セイシン企業製] で微粉砕した。次いでその粉砕物と、表２記載の界面活性剤、比重１未満の固体物質、その他の補助剤および分散媒を撹拌混合して懸濁組成物を得た。
【００５７】
【表２】

【００５８】
また、これら懸濁組成物の１０アールおよび０．０１アールあたりの散布液量、およびその懸濁組成物の比重を表３に示した。
【００５９】
【表３】

【００６０】
〔試験例１〕（分散安定性試験）
実施例および比較例で製造した懸濁組成物を、２５０ｍｌの共栓付メスシリンダー中に入れ、４０℃の恒温槽内に３カ月間および５４℃の恒温槽内に３カ月間の二条件で静置保存した後、懸濁組成物の上層を観察し比重１未満の固体物質の浮上分離の有無を評価した。
【００６１】
結果を表４に示す。表４のように、比重１未満の固体物質の平均粒子径が５０μｍ未満で比重が０．２５以上である場合には、比重１未満の固体物質の浮上分離が見られず、分散安定性に優れていた。
【００６２】
【表４】

【００６３】
〔試験例２〕（拡散性試験）
幅２５cm、長さ４m、高さ１５cmの塩化ビニル製の試験容器（底面積：０．０１アール）に、水を水深５cmになるように入れ、端から５cmの位置に、表３記載の０．０１アール当たりの散布液量の懸濁組成物をピペットを用いて滴下散布した。処理３時間後に、ピペットを用い、処理部および端から１、２、３、４m地点の水深２．５cmの位置から水をそれぞれ２ml採取し、農薬活性成分濃度をＨＰＬＣにて分析した。拡散性は、農薬活性成分が均一に拡散した場合の理論水中濃度に対する、ＨＰＬＣ分析による実際の水中濃度の百分率（％）で示した。
【００６４】
結果を表５に示す。表５のように、本発明の懸濁組成物は比較例に比べ優れた拡散性を示した。
【００６５】
【表５】

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension composition and a spraying method for direct spraying of submerged sewage paddy fields in which pesticidal active ingredients are excellent in water diffusibility.
[0002]
[Prior art]
Conventionally, granule, powder, emulsion, wettable powder and the like are used for spraying agricultural chemicals to paddy fields. However, powders and wettable powders may affect the sprayer and the environment due to powdering, and even emulsions have problems in terms of toxicity and flammability of organic solvents. The granule is a highly safe dosage form with few of these problems, but it requires an application amount of 1 to 4 kilograms per 10 ares, and it is laborious to the sprayer especially when spraying to a large paddy field. Therefore, there is a demand for the development of a small amount of spray to reduce the dosage of the preparation.
[0003]
However, if the application amount of the granule is reduced, the concentration of the pesticidal active ingredient in the granule inevitably increases, and the number of grains per unit area decreases. As a result, rice bran unevenness or it becomes difficult to dissolve or diffuse the pesticidal active ingredient in the paddy water sufficiently uniformly from the granule, which tends to cause a decrease in the effect and phytotoxicity to rice.
[0004]
From the above point, in recent years, a method (Japanese Patent Publication No. 7-47521) has been proposed in which a suspension composition is directly sprayed onto a flooded sewage paddy field.
[0005]
The suspension composition is obtained by suspending the pesticidal active ingredient in water or a non-aqueous solvent. Since the specific gravity of the pesticidal active ingredient is usually 1 or more, the specific gravity of the suspension composition itself tends to be larger than 1. In particular, when the concentration of the pesticidal active ingredient in the composition is high, the specific gravity becomes larger, and when sprayed on a flooded sewage paddy field, the liquid droplet itself tends to sink to the bottom of the water. Therefore, depending on the type of the pesticidal active ingredient, the diffusion of the pesticidal active ingredient into the soil becomes insufficient, and when sprayed from the shore, the pesticidal active ingredient becomes uneven, In some cases, phytotoxicity to paddy rice and lack of effect in the center of paddy field were observed.
[0006]
Japanese Patent Application Laid-Open No. 11-228303 is characterized in that a hollow organic powder is added to an agrochemical composition comprising an agrochemical active ingredient hardly soluble or insoluble in water, a surfactant, water and, if necessary, an auxiliary agent. A surface-applied suspension or milk suspension pesticide composition with improved spreadability and storage stability is described.
[0007]
[Problems to be solved by the present invention]
Accordingly, the problem of the present invention is that it can be sprayed labor-saving in flooded sewage paddy fields, and the pesticidal active ingredient diffuses quickly in paddy field water, and there is no problem in terms of medicinal efficacy and phytotoxicity and spraying method. Is to provide.
[0008]
[Means for Solving the Problems]
The present invention relates to a suspension composition and a spraying method according to the following [1] to [9].
[0009]
[1] A suspension composition comprising a solid substance having a specific gravity of less than 1, a surfactant, a dispersion medium, and an agrochemical active ingredient (provided that the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersion medium is water) Excluding applied suspension compositions).
[0010]
[2] Suspended composition for direct spraying of a submerged sewage paddy field containing a solid substance having a specific gravity of less than 1, a surfactant, a dispersion medium and an agrochemical active ingredient (provided that the solid substance having a specific gravity of less than 1 is a hollow organic powder, and (Excluding water surface applied suspension compositions in which the dispersion medium is water.)
[0011]
[3] The suspension composition according to the above [1] or [2], wherein the solid substance having a specific gravity of less than 1 has an average particle size of less than 50 μm.
[0012]
[4] The suspension composition according to the above [1] to [3], wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body.
[0013]
[5] The suspension composition as described in [1] to [4] above, wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.
[0014]
[6] The suspension composition described in [1] to [5] above, wherein the specific gravity of the suspension composition is less than 1.05.
[0015]
[7] The suspension composition as described in [1] to [5] above, wherein the specific gravity of the suspension composition is less than 1.
[0016]
[8] A suspension composition containing a solid substance having a specific gravity of less than 1, a surfactant, a dispersion medium, and an agrochemical active ingredient (provided that the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersion medium is water) The suspension composition is sprayed directly onto a flooded sewage paddy field.
[0017]
[9] The method for spraying a suspension composition according to the above [8], wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
The effect of the solid material having a specific gravity of less than 1 used in the present invention is to reduce the specific gravity of the suspension composition, so that when the suspension composition is sprayed directly on a flooded sewage paddy field, it is difficult for the suspension composition to sink. It is to be. In addition, even when the suspension composition once settles, the solid substance re-floats with the pesticidal active ingredient distributed around the solid substance due to its buoyancy, and thus the sedimentation of the pesticidal active ingredient is suppressed. Furthermore, when a surfactant is contained, the surface composition is imparted with water surface spreadability by its surface tension reducing ability.
The synergistic action of these actions significantly improves the diffusibility of the suspension composition in the water surface and in water, and as a result, it is possible to quickly and uniformly distribute the pesticidal active ingredient over a wide range.
[0019]
The suspension composition of the present invention can be sprayed at any time before, during or after transplanting rice if the paddy field after the paddy field operation is flooded. It can also be applied to flooded direct sowing rice. It can also be sprayed when irrigation water enters. Further, the suspension composition may be sprayed locally on the paddy field, and it is not necessary to spray the suspension composition uniformly over the entire paddy field like a granule. The spraying method may be carried out by hand shaking in a plastic container, or sprayed or sprayed using a pressurized sprayer. Furthermore, it is also suitable for spraying using RC (radio control) helicopters that have become widespread in recent years. Alternatively, it may be sprayed and dropped into the inflow water at the water inlet of the paddy field and poured into the paddy field together with the inflow water.
[0020]
The amount of application per unit area of the suspension composition of the present invention is not particularly limited, but the amount of application per 10 ares is preferably 1000 ml or less, more preferably 100 to 500 ml, from the viewpoint of labor saving of application.
[0021]
Examples of the solid substance having a specific gravity of less than 1 used in the present invention include resin powder, inorganic or organic hollow bodies or hollow porous bodies (referring to those having a large number of bubbles in the particles), and the like. Specifically, synthetic resin powders such as polyethylene powder and polypropylene powder, hollow inorganic powders such as hollow bodies made of microshirasu balloons and borosilicate glass, phenol resins, epoxy resins, acrylic resins (for example, vinylidene chloride-acrylonitrile copolymer) And a hollow organic powder made of a synthetic resin such as a polystyrene resin. These solid substances may be any solid substances that can lower the specific gravity of the suspension composition with a specific gravity of less than 1, but hollow bodies or hollow porous bodies that have a sufficient specific gravity lowering effect even with a small addition amount are preferred.
[0022]
In addition, when a liquid agrochemical active ingredient is used, when an agrochemical active ingredient is dissolved in an organic solvent, or when a non-aqueous liquid is used as all or part of a dispersion medium, a solid substance having a specific gravity of less than 1, It is necessary to select from those which do not dissolve in these liquids or cause deterioration due to these liquids. Preferred is a hollow inorganic powder.
[0023]
The average particle size of the solid substance having a specific gravity of less than 1 is not particularly limited, but is usually less than 50 μm, preferably 0.01 to 30 μm, more preferably from the viewpoint of improving the stability of the suspension and improving the diffusibility of the suspension. 0.05 to 10 μm or less.
[0024]
The specific gravity of the solid substance having a specific gravity of less than 1 can be used as long as it is less than 1. However, in order to exert the effect with a smaller addition amount, the specific gravity is preferably 0.8 or less, more preferably 0.7 or less. Should be selected from. In addition, when the specific gravity is too small, it is easy to separate in the suspension, and thus a specific gravity of a certain level or more is easy to use. Preferably, the specific gravity should be selected from 0.1 or more, more preferably 0.25 or more.
[0025]
From the above points, the preferred specific gravity of the solid substance having a specific gravity of less than 1 is 0.1 to 0.8, more preferably 0.25 to 0.7. Hollow inorganic powders such as hollow bodies made of
[0026]
In order for the suspension composition of the present invention to have sufficient diffusibility, the specific gravity of the suspension composition is preferably less than 1.05, more preferably 0.7 to less than 1. The specific gravity of the suspension composition can be appropriately adjusted by increasing / decreasing the specific gravity of the solid substance having a specific gravity of less than 1 and the blending amount thereof contained in the suspension composition. For example, if it is desired to reduce the specific gravity of the suspension composition, a solid material having a specific gravity of less than 1 may be used, or a solid material having a specific gravity of less than 1 may be used.
[0027]
The agrochemical active ingredient that can be used in the agrochemical granule of the present invention is not particularly limited, but examples thereof include the following, and one or more of these may be used in combination.
[0028]
Examples of herbicides include pyrazosulfuron ethyl (generic name), halosulfuron methyl (generic name), bensulfuron methyl (generic name), imazosulfuron (generic name), azimusulfuron (generic name) azimsulfuron (generic name), sinosulfuron (generic name), sulfonylurea herbicides such as cyclosulfamuron (generic name) and ethoxysulfuron (generic name), esprocarb (generic name), Carbamate herbicides such as benthiocarb (benthiocarb / generic name), molinate (generic name), dimepiperate (generic name) and pyributicarb (generic name), mefenacet (generic name), butachlor / Generic name), pretila claw Acid amide herbicides such as le (pretilachlor / generic name), tenylchlor (thenylchlor / generic name), bromobutide (generic name), and etobenzanide (generic name), dimron (generic name) and cumylron ( urea herbicides such as cumyluron / generic name), diazine herbicides such as bentazone (bentazone / generic name) and salts of bentazone, 2,4-D (generic name), 2,4-D salt, 2, 4-D ester, MCP (generic name), MCP salt, MCP ester, MCPB (generic name), MCPB salt, MCPB ester, phenothiol (MCPA-thioethyl / generic name), chromeprop (generic) Name) and phenoxy acid herbicides such as naproanilide (generic name), oxadiazon (generic name), pyrazolate (generic name) Diazole herbicides such as pyrazoxifene (generic name), benzofenap (generic name) and oxadiargyl (generic name), triazines such as dimethametryn (generic name) and simethrin (simetryn / generic name) Herbicides, piperofos (generic name), anilofos (generic name), butamifos (generic name) and organophosphorus herbicides such as bensulide (generic name), dithiopyr (generic name) And aromatic carboxylic acid herbicides such as pyriminobac methyl (generic name), CNP (generic name), chlormethoxynil (generic name), cyhalofop butyl (generic name) and bifenox ( bifenox (generic name) and other diphenyl ether herbicides and fences Troll (cafenstrole / generic name), pentoxazone (generic name), indanofan (indanofan / generic name), oxadichrome mefone (oxaziclomefone / generic name), fentrazamide (generic name), butenachlor (butenachlor / generic name), ACN ( Other herbicides such as general name), benzobicyclon (test name), benfuresate (generic name) and cymmethylin (generic name).
[0029]
Insecticides include, for example, MPP (generic name), MEP (generic name), pirimiphos methyl (generic name), diazinon (generic name), pyridafenthion (pyridaphenthion / generic name), chlorpyrifos methyl (general name) Name), bamidothion (vamidothion / generic name), marathon (malathion / generic name), PAP (generic name), dimethoate (generic name), ethylthiomethone (disulfoton / generic name), PMP (generic name), monocrotophos ( Organics such as monocrotophos / generic name, BRP (generic name), CVMP (generic name), dimethylvinphos (generic name), propaphos (generic name), DEP (generic name) and EPN (generic name) Phosphorus insecticide, NAC (generic name), MTMC (generic name), MIPC (generic name), BPMC (generic name), PHC (generic name), XMC (generic name), mesomil (generic name), thiodicarb (generic name), bendiocarb (generic name), carbosulfan (generic name) and benfracarp ( Carbamate insecticides such as benfuracarb (generic name), nereistoxin insecticides such as cartap (generic name), thiocyclam (generic name) and bensultap (generic name), buprofezin (generic name) ) And tebufenozide (generic name), insect growth regulators, pyrethroid insecticides such as etofenprox and cycloprothrin (generic name), and fipronil (generic name) and Other insecticides such as imidacloprid (generic name) .
[0030]
Examples of fungicides include copper fungicides such as inorganic copper agents, organochlorine fungicides such as fusalide (general name), organophosphorus fungicides such as IBP (generic name) and EDDP (generic name), and iprodione. (Iprodione / generic name) dicarboximide fungicides, mepronil (mepronil / generic name), flutolanil (flutolanil / generic name), tecloftalam (generic name), penclon (pencycuron / generic name), metalaxyl / General name), thifluzamide (generic name), diclocymet (generic name), furametpyr (generic name), and carpropamide (generic name) acid amide fungicides, blasticidin S (blasticidin S) / Generic name), kasugamycin (generic name), polyoxins (polyoxins / generic name), validamyc (validamyc) antibiotics such as in A / generic name) and spinosad (generic name), azoxystrobin (generic name), cresoxim methyl (generic name) and metminostrobin (generic name) Methoxyacrylate fungicides, nitromethylene fungicides such as acetamiprid (acetamiprid / generic name) and clothianidin (chlothianidine / generic name), organic arsenic, dichromedine (diclomezine / generic name), ferrimzone (ferimzone / generic name), probenazole (Probenazole / generic name), isoprothiolane (generic name), tricyclazole (generic name), pyroquilon (generic name), iminoctazine acetate (guazatine / generic name), chlorfenapyr (generic name), mepanipyrim (Mepanipyrim / generic name), Oki Other fungicides such Linnik acid (oxolinic acid / generic name) and acibenzolar -S- methyl (acibenzolar-S-methyl / generic name) and the like.
[0031]
Examples of plant growth regulators include uniconazole (uniconazole / generic name) and inabenfide (generic name).
[0032]
Examples of the surfactant used in the present invention include the following (A), (B), (C), (D) and (E), and one or more of these may be used in combination.
[0033]
(A) Nonionic surfactant:
(A-1) Polyethylene glycol type surfactant:
For example, polyoxyethylene alkyl (C_{12 ~ 18}) Ether, alkyl naphthol ethylene oxide adduct, polyoxyethylene (mono or di) alkyl (C_{8 ~ 12}) Phenyl ether, polyoxyethylene (mono or di) alkyl (C_{8 ~ 12}) Formalin condensate of phenyl ether, polyoxyethylene (mono, di or tri) phenyl phenyl ether, polyoxyethylene (mono, di or tri) benzyl phenyl ether, polyoxypropylene (mono, di or tri) benzyl phenyl ether, Polyoxyethylene (mono, di or tri) styryl phenyl ether, polyoxypropylene (mono, di or tri) styryl phenyl ether, polyoxyethylene (mono, di or tri) styryl phenyl ether polymer, polyoxyethylene polyoxypropylene Block polymer, alkyl (C_{12 ~ 18}) Polyoxyethylene polyoxypropylene block polymer ether, alkyl (C_{8 ~ 12}) Phenyl polyoxyethylene polyoxypropylene block polymer ether, polyoxyethylene bisphenyl ether, polyoxyethylene resin acid ester, polyoxyethylene fatty acid (C_{12 ~ 18}) Monoester, polyoxyethylene fatty acid (C_{12 ~ 18}) Diester, polyoxyethylene sorbitan fatty acid (C_{12 ~ 18}) Ester, glycerol fatty acid ester ethylene oxide adduct, castor oil ethylene oxide adduct, hydrogenated castor oil ethylene oxide adduct, alkyl (C_{12 ~ 18}) Amine ethylene oxide adducts and fatty acids (C_{12 ~ 18}) Amidoethylene oxide adduct and the like.
[0034]
(A-2) Polyhydric alcohol surfactant:
For example, glycerol fatty acid ester, polyglycerol fatty acid ester, pentaerythritol fatty acid ester, sorbitol fatty acid (C_{12 ~ 18}) Esters, sorbitan fatty acids (C_{12 ~ 18}) Esters, sucrose fatty acid esters, polyhydric alcohol alkyl ethers and fatty acid alkanolamides.
[0035]
(A-3) Acetylene-based surfactant:
Examples thereof include acetylene glycol, acetylene alcohol, ethylene oxide adduct of acetylene glycol, ethylene oxide adduct of acetylene alcohol, and the like.
[0036]
(A-4) Other surfactants:
Examples thereof include alkyl glycosides.
[0037]
(B) Anionic surfactant:
(B-1) Carboxylic acid type surfactant:
For example, polyacrylic acid, polymethacrylic acid, polymaleic acid, copolymers of maleic acid and olefins (such as isobutylene and diisobutylene), copolymers of acrylic acid and itaconic acid, copolymers of methacrylic acid and itaconic acid Polymer, Copolymer of maleic acid and styrene, Copolymer of acrylic acid and methacrylic acid, Copolymer of acrylic acid and acrylic acid methyl ester, Copolymer of acrylic acid and vinyl acetate, Acrylic acid and Maleic acid copolymer, N-methyl-fatty acid (C_{12 ~ 18}) Sarcosinates, resin acids and fatty acids (C_{12 ~ 18}), And salts of these carboxylic acids.
[0038]
(B-2) Sulfate type surfactant:
For example, alkyl (C_{12 ~ 18}) Sulfate ester, polyoxyethylene alkyl (C_{12 ~ 18}) Ether sulfate, polyoxyethylene (mono or di) alkyl (C_{8 ~ 12}) Phenyl ether sulfate, polyoxyethylene (mono or di) alkyl (C_{8 ~ 12}) Phenyl ether polymer sulfate ester, polyoxyethylene (mono, di or tri) phenyl phenyl ether sulfate ester, polyoxyethylene (mono, di or tri) benzyl phenyl ether sulfate ester, polyoxyethylene (mono, di or tri) ) Styryl phenyl ether sulfate ester, polyoxyethylene (mono, di or tri) styryl phenyl ether polymer sulfate ester, polyoxyethylene polyoxypropylene block polymer sulfate ester, sulfated oil, sulfated fatty acid ester, sulfated fatty acid And sulfates such as sulfated olefins, and salts of these sulfates.
[0039]
(B-3) Sulfonic acid type surfactant:
For example, paraffin (C_{12 ~ twenty two}) Sulfonic acid, alkyl (C_{8 ~ 12}) Benzenesulfonic acid, alkyl (C_{8 ~ 12}) Formalin condensate of benzene sulfonic acid, formalin condensate of cresol sulfonic acid, α-olefin (C_{14 ~ 16}) Sulfonic acid, dialkyl (C_{8 ~ 12}) Sulfosuccinic acid, lignin sulfonic acid, polyoxyethylene (mono or di) alkyl (C_{8 ~ 12}) Phenyl ether sulfonic acid, polyoxyethylene alkyl (C_{12 ~ 18}) Ether sulfosuccinic acid half ester, naphthalene sulfonic acid, (mono or di) alkyl (C_{1 ~ 6}) Naphthalenesulfonic acid, formalin condensate of naphthalenesulfonic acid, (mono or di) alkyl (C_{1 ~ 6}) Formalin condensate of naphthalene sulfonic acid, formalin condensate of creosote oil sulfonic acid, alkyl (C_{8 ~ 12}) Sulfonic acids such as diphenyl ether disulfonic acid, Igepon T (trade name), polystyrene sulfonic acid and a copolymer of styrene sulfonic acid and methacrylic acid, and salts of these sulfonic acids.
[0040]
(B-4) Phosphate ester type surfactant:
For example, alkyl (C_{8 ~ 12}) Phosphate ester, polyoxyethylene alkyl (C_{12 ~ 18}) Ether phosphate, polyoxyethylene (mono or di) alkyl (C_{8 ~ 12}) Phenyl ether phosphate, polyoxyethylene (mono, di or tri) alkyl (C_{8 ~ 12}) Phenyl ether polymer phosphate ester, polyoxyethylene (mono, di or tri) phenyl phenyl ether phosphate ester, polyoxyethylene (mono, di or tri) benzyl phenyl ether phosphate ester, polyoxyethylene (mono, di or tri) ) Styryl phenyl ether phosphate ester, polyoxyethylene (mono, di or tri) styryl phenyl ether polymer phosphate ester, polyoxyethylene polyoxypropylene block polymer phosphate ester, phosphatidylcholine, phosphatidylethanolimine and condensed phosphate (eg tripolyphosphate) And the like, and salts of these phosphate esters.
[0041]
Examples of the salt in the above (B-1) to (B-4) include alkali metals (lithium, sodium, potassium, etc.), alkaline earth metals (calcium, magnesium, etc.), ammonium and various amines (for example, alkylamine, cyclohexane). Alkylamine and alkanolamine).
[0042]
(C) Cationic surfactant:
Examples thereof include alkylamine salts and alkyl quaternary ammonium salts.
[0043]
(D) Amphoteric surfactant:
Examples thereof include betaine type surfactants and amino acid type surfactants.
[0044]
(E) Other surfactants:
For example, silicone surfactants and fluorine surfactants can be used.
[0045]
Examples of the dispersion medium used in the present invention include glycols, organic solvents such as vegetable oil and mineral oil, and water, and water is preferred.
[0046]
Moreover, an organic solvent, a freezing point depressant, an anti-settling agent, an antifoaming agent, an antiseptic, etc. can be used as other adjuvants as needed. Examples of organic solvents include didodecyl phthalate, ditridecyl phthalate, phenylxylyl ethane, and dodecyl benzene. Examples of freezing point depressants include ethylene glycol, propylene glycol, and glycerin. Examples of antisettling agents include xanthan gum. Lanthanum gum, N-vinylacetamide polymer, microcrystalline cellulose, bentonite, colloidal hydrous aluminum magnesium silicate, etc. are exemplified, silicone anti-foaming agent is exemplified, and benzoic acid is exemplified as antiseptic. Examples include sodium and 1,2-benzisothiazolin-3-one.
[0047]
The method for producing the suspension composition of the present invention is not particularly limited, and the suspension composition can be obtained by adding the above-described components to a dispersion medium and mixing them with a stirrer. Further, if necessary, the pesticidal active ingredient, the solid substance having a specific gravity of less than 1 and other auxiliary agents may be singly or mixed and finely pulverized by a dry type and a wet type pulverizer.
[0048]
The fine pulverization by dry pulverization can be performed with an impact pulverizer, a ball mill, a jet mill, or the like. Fine grinding by wet pulverization is performed by Attritor (trade name), Sand Grinder (trade name), Dino Mill (trade name), Pearl Mill (trade name), Apex Mill (trade name), Visco Mill (trade name) and Ultra Visco Mill ( (Product name) etc.
[0049]
The suspension composition of the present invention can also be produced by mixing a solid agrochemical composition containing a solid substance having a mean particle diameter of less than 50 μm and a specific gravity of less than 1, a surfactant and an agrochemical active ingredient, and an appropriate amount of water. . The shape of the solid agrochemical composition may be any of powder, granule, tablet and the like.
[0050]
【Example】
Next, the present invention will be described more specifically with reference to examples. The meanings of the abbreviations used in Table 2 below are shown in Table 1.
[0051]
[Table 1]

[0052]
The average particle diameter of the solid substance having a specific gravity of less than 1 shown in Table 1 is a value measured by the following method. 1 g of a solid substance having a specific gravity of less than 1 is added to 100 ml of a 1% aqueous solution of POE alkylaryl ether, and stirred for 30 minutes while applying ultrasonic waves to disperse the particles. The dispersion was quickly measured with a Coulter LS130 type laser particle size measuring machine (manufactured by Beckman Coulter, Inc.), and the volume median diameter of the particles was determined to obtain the average particle diameter.
[0053]
The specific gravity of a solid substance having a specific gravity of less than 1 was measured by a pycnometer method (JIS-Z8807).
[0054]
[Examples 1-7]
Halosulfuron methyl (generic name) was pulverized in advance with a jet omizer [manufactured by Seishin Corporation]. Subsequently, the pulverized product, the surfactant described in Table 2, a solid substance having a specific gravity of less than 1, other adjuvants and a dispersion medium were stirred and mixed to obtain a suspension composition of the present invention.
[0055]
[Comparative Example 1]
The halosulfuron methyl was finely pulverized in advance with a jet ohmizer [manufactured by Seishin Corporation]. Subsequently, the pulverized product, the surfactant described in Table 2, other auxiliary agents, and a dispersion medium were stirred and mixed to obtain a suspension composition.
[0056]
[Comparative Examples 2-6]
The halosulfuron methyl was finely pulverized in advance with a jet ohmizer [manufactured by Seishin Corporation]. Subsequently, the pulverized product, the surfactant listed in Table 2, a solid substance having a specific gravity of less than 1, other adjuvants and a dispersion medium were mixed with stirring to obtain a suspension composition.
[0057]
[Table 2]

[0058]
Table 3 shows the amount of sprayed liquid per 10 ares and 0.01 ares of these suspension compositions and the specific gravity of the suspension composition.
[0059]
[Table 3]

[0060]
[Test Example 1] (Dispersion stability test)
The suspension compositions produced in Examples and Comparative Examples were placed in a 250 ml graduated cylinder with a stopper, and were subjected to two conditions for 3 months in a constant temperature bath at 40 ° C and for 3 months in a constant temperature bath at 54 ° C. After standing still, the upper layer of the suspension composition was observed to evaluate the presence or absence of floating separation of a solid substance having a specific gravity of less than 1.
[0061]
The results are shown in Table 4. As shown in Table 4, when the average particle size of the solid substance having a specific gravity of less than 1 is less than 50 μm and the specific gravity is 0.25 or more, the solid substance having a specific gravity of less than 1 is not floated and separated. It was excellent.
[0062]
[Table 4]

[0063]
[Test Example 2] (Diffusion test)
In a vinyl chloride test container (bottom area: 0.01 are) having a width of 25 cm, a length of 4 m, and a height of 15 cm, water is poured so that the water depth is 5 cm. The suspension composition with a spraying liquid amount per 0.01 ares was sprayed dropwise using a pipette. Three hours after the treatment, 2 ml of water was collected from the treatment part and from the position of the water depth of 2.5 cm at 1, 2, 3, and 4 m from the end using the pipette, and the concentration of the pesticidal active ingredient was analyzed by HPLC. The diffusivity was expressed as a percentage (%) of the actual water concentration by HPLC analysis with respect to the theoretical water concentration when the pesticidal active ingredient was uniformly diffused.
[0064]
The results are shown in Table 5. As shown in Table 5, the suspension composition of the present invention showed excellent diffusibility as compared with the comparative example.
[0065]
[Table 5]

Claims (8)

  Suspension composition for direct spraying of submerged sewage paddy field containing solid substance having specific gravity of less than 1, surfactant, dispersion medium and agrochemical active ingredient (however, the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersion medium is (Excluding water surface applied suspension compositions). Suspension composition according to claim 1, wherein an average particle diameter of the specific gravity less than one solid material is less than 50 [mu] m. The suspension composition according to claim 1 or 2 , wherein the solid substance having a specific gravity of less than 1 is a hollow body or a hollow porous body. Specific gravity less than one solid material, claims 1 is hollow inorganic powder 3 suspension composition. The suspension composition according to claims 1 to 4 , wherein the specific gravity of the suspension composition is less than 1.05. The suspension composition according to any one of claims 1 to 4 , wherein the specific gravity of the suspension composition is less than 1.   Suspension composition comprising a solid substance having a specific gravity of less than 1, a surfactant, a dispersion medium and an agrochemical active ingredient (provided that the solid substance having a specific gravity of less than 1 is a hollow organic powder and the dispersion medium is water) A method for spraying a suspension composition, characterized in that the composition is directly sprayed on a flooded sewage paddy field. The method for spraying a suspension composition according to claim 7 , wherein the solid substance having a specific gravity of less than 1 is a hollow inorganic powder.