JPH04270201A - Aqueous suspending agent composition - Google Patents

Abstract

PURPOSE:To provide an aqueous suspending agent composition which can reduce agent-treated spots produced on the surface of a paddy field when the concentrated agent is directly dropped and spread on the paddy field, which diffuses in a short time substantially not to leave the concentrated agent and which has no problem on practical applications. CONSTITUTION:An aqueous suspending agent composition comprises a slightly water-soluble liquid or solid herbicidal active ingredient, a surfactant, water and an amorphous aluminosilicate salt.

Description

Description: [0001] [Industrial Application Field] The present invention relates to an aqueous suspension composition, and more specifically, the present invention relates to an aqueous suspension composition containing a poorly water-soluble herbicide active ingredient, a surfactant,
The present invention relates to an aqueous suspension composition containing water and an amorphous aluminosilicate. [Prior Art] The formulation forms of agricultural chemical compositions include powders, powders,
There are granules, wettable powders, emulsions, aqueous suspensions, etc., and each is used depending on the properties of the active ingredient, purpose, and usage situation. [0003] Aqueous suspensions are generally produced by pulverizing the active ingredient into a fine powder with an average particle size of about 0.5 to 10 μm, and adding a surfactant and, if necessary, water as a dispersion medium, when the active ingredient is solid. It is a formulation in which a thickener such as a water-soluble polymer is blended into a dispersed suspension of an active agricultural ingredient, and it is in the form of a liquid formulation, also called a sol or flowable. [0004] Aqueous suspensions use water as the dispersion medium and do not require the use of large amounts of organic solvents unlike emulsions. Therefore, problems such as toxicity, irritation, and odor to humans, livestock, and small animals caused by organic solvents, and There are no flammability problems. In addition, even agricultural pesticide active ingredients that are sparingly soluble in water or organic solvents can be formulated into liquid formulations. Furthermore, since aqueous suspensions are liquid, they have many excellent features compared to wettable powders and the like, such as being easier to measure and not producing powder when diluted with water. Aqueous suspensions, like wettable powders, are diluted with water and sprayed. [0005] Regarding this aqueous suspension, a method has been proposed in which an aqueous suspension composition containing an active herbicide ingredient is directly dripped onto a flooded paddy field (Japanese Patent Laid-Open No. 62-45).
No. 501, JP-A-62-289502, JP-A-63-
107901 publications). [0006] When an aqueous suspension is directly applied dropwise to a paddy field, traces of the chemical treatment may remain on the surface of the paddy soil depending on the formulation or when the depth of flooding is shallow. Normally, these treatment marks gradually disappear over time, but depending on the prescription, treatment marks may remain for a long time. If treatment marks remain for a long time, it means that the chemical is localized on the soil surface, and depending on the type of active ingredient, the effect may be uneven or chemical damage to transplanted rice may occur. For this reason, it is desirable to have a pharmaceutical formulation that allows the sprayed drug to diffuse in a short period of time and leaves no traces of treatment. On the other hand, in the field of agrochemical formulations, the use of amorphous aluminosilicates in aqueous suspensions has not been known until now. [0008] The present inventors have devised an aqueous suspension composition that can reduce chemical treatment marks on the surface of paddy soil, which can occur when a undiluted solution is directly applied dropwise to paddy fields. ,
In addition, the present invention was completed as a result of extensive research to develop a formulation that diffuses in a short period of time, leaves little residue behind, and poses no practical problems. [Means and effects for solving the problems] The present invention has the following features:
The present invention provides an aqueous suspension composition (hereinafter referred to as the composition of the present invention) characterized by containing a poorly water-soluble herbicide active ingredient, a surfactant, water, and an amorphous aluminosilicate. be. The surfactant used in the composition of the present invention is not particularly limited, and various anionic surfactants, nonionic surfactants, etc. that have been conventionally used in the field of agricultural chemical formulations can be used. [0011] Examples of anionic surfactants include:
Alkylsulfonic acid, alpha olefin sulfonic acid,
Sulfonic acid surfactants such as lignin sulfonic acid, alkylbenzene sulfonic acid, alkylnaphthalene sulfonic acid, naphthalene sulfonic acid formalin condensate, dialkyl sulfosuccinate and their salts, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl allyl ether Sulfate surfactants such as sulfate, polyoxyethylene styryl phenyl ether sulfate, polyoxyethylene phenyl alkyl allyl ether sulfate, polyoxyalkylene glycol sulfate, higher alcohol sulfate, fatty acid ester sulfate, phenylphenol (EO) sulfate, and their salt, polyoxyethylene alkyl ether phosphate, polyoxyethylene alkyl allyl phosphate, phenylphenol (
EO) Phosphate surfactants such as phosphate ester salts, polyoxyethylene phenylalkylaryl ether phosphate, higher alcohol phosphates, polyoxyethylene tribenzylphenol phosphate, etc., and their salts, higher fatty acid salts, polycarboxylic acid type surfactants and salts thereof. The salts of each of the above-mentioned surfactants include salts of sodium, potassium, magnesium, calcium, ammonium, ethanolamine, diethanolamine, triethanolamine, various amines, and the like. Examples of nonionic surfactants include:
Polyoxyethylene alkyl allyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene phenyl alkyl allyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycol, polyoxyethylene alkyl ester, polyoxyethylene poly Examples include oxypropylene block copolymer, polyoxyalkylene glycol, alkyne diol (acetylene glycol), alkynylene polyoxyethylene diol, sorbitan fatty acid ester, and alkylaryl ether formalin condensate. [0013] These surfactants may be used alone or in combination of two or more, and the mixing ratio can be freely selected. Further, the amount added in the composition of the present invention can be selected as appropriate, but preferably in the range of 0.1 to 10%. The amorphous aluminosilicate used in the composition of the present invention is an amorphous aluminosilicate, for example, sodium aluminate and/or aluminum sulfate in various ratios to sodium silicate, etc. mix,
The resulting gel can be obtained by filtering and drying. The cations contained in amorphous aluminosilicate are:
Examples include alkali metals and alkaline earth metals. Although the amount added in the composition of the present invention can be selected as appropriate,
It can be appropriately selected preferably within the range of 0.1 to 10%. In the composition of the present invention, various thickeners such as water-soluble polymer compounds and smectite clay minerals can be used. There are no particular restrictions on the thickener used.
Organic or inorganic natural products, synthetic products or semi-synthetic products can be used, such as guar gum, locust bean gum, quince seed gum, tara gum, tragacanth gum, karaya gum, xanthan gum, welan gum, rhamsan gum, carrageenan, gum arabic. Various gums such as heteropolysaccharides such as sodium alginate, ammonium alginate, alginic acid derivatives such as alginate propylene glycol ester, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methacrylate, polyethylene oxide, polyacrylic acid,
Synthetic organic water-soluble polymer compounds such as sodium polyacrylate and polyacrylamide, dextrin, pectin,
Natural water-soluble polymer compounds such as gelatin, casein, glue, albumin, cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, starch derivatives such as sodium carboxymethyl starch, hydroxyethyl starch, etc.
Examples include inorganic smectite clay minerals such as montmorillonite, saponite, hectorite, beidellite, nontronite, saucolite, steppensite, and bentonite. These thickeners may be used alone or in combination of two or more, and the mixing ratio can be freely selected. These thickeners may be added as is,
Alternatively, it may be added by dispersing it in water in advance. Further, the amount of addition when added to the composition of the present invention can also be freely selected. [0016] The composition of the present invention can be used as an antifreeze agent in cold seasons. Examples of antifreeze agents that can be used include alcohols such as ethylene glycol, diethylene glycol, propylene glycol, glycerin, methanol, ethanol, and isopropanol, water-soluble organic compounds such as urea, sodium chloride, potassium chloride, sodium sulfate, and sodium carbonate. , ammonium chloride, ammonium sulfate, ammonium nitrate, calcium chloride, sodium phosphate, potassium phosphate, sodium acetate, ammonium acetate, and other inorganic or organic salts can be added. Further, the amount of addition when added to the composition of the present invention can also be freely selected. [0017] The composition of the present invention may also contain various substances such as inorganic substances such as white carbon, resins such as petroleum resin, coumaron resin, and ester gum, liquid paraffin, and hydrocarbon solvents depending on the purpose. amount can be added. Further, other components such as an antifoaming agent such as a silicone emulsion, an antibacterial and antifungal agent, and a coloring agent may be added. Various antibacterial and fungicidal agents can be used, such as sorbic acid and its salts, benzoic acid and its salts, dehydroacetic acid and its salts, paraoxybenzoic acid esters, thiabendazole, BIT, thiazolone, BNPK. , Neomexin (Ueno Pharmaceutical Co., Ltd.)
), Hokusite LX-2 (manufactured by Hokuko Chemical Industry Co., Ltd.),
Deltop, Deltop 33 (manufactured by Takeda Pharmaceutical Co., Ltd.), Biocide 800A, Biocide 800S (manufactured by Taisho Co., Ltd.), Proxel CRL, Proxel G
XL, Proxel XL-2, Proxel TN (manufactured by ICI Corporation), Biotac, Bioace,
Products such as Biohop (manufactured by K.I. Kasei Co., Ltd.) can be used. In addition to these, various antibacterial and fungicidal agents can be appropriately selected and used. Further, the amount of addition when added to the composition of the present invention can also be freely selected. The herbicide active ingredient that can be used in the composition of the present invention is not particularly limited as long as it is sparingly soluble in water, but the solubility in water is 1 at 25°C.
00 ppm or less is more preferable. For example, O-4-tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methyl-thiocarbamate [Compound No. 1], O-3-te
rt-Butylphenyl N-(6-methoxy-2-pyridyl)-N-methyl-thiocarbamate [generic name: pybuticarb, compound No. 2], O-4-chloro-3-
Ethylphenyl = N-(6-methoxy-2-pyridyl)
-N-methyl-thiocarbamate [Compound No. 3],
O-4-bromo-3-ethylphenyl N-(6-methoxy-2-pyridyl)-N-methyl-thiocarbamate [Compound No. 4], 3-tert-butyl-4-chlorophenyl=N-(6-methoxy-2-pyridyl)-N
-Methyl carbamate [Compound No. 5], O-4-trifluoromethylphenyl=N-(6-methoxy-2-
pyridyl)-N-methyl-thiocarbamate [compound N
o. 6], S-4-chlorobenzyl N,N-diethylthiocarbamate [generic name: Benthiocarb, compound N
o. 7], S-α,α-dimethylbenzyl-N,N-pentamethylene thiocarbamate [generic name: dimepiperate, compound No. 8], S-benzyl=N-ethyl-N
-(1,2,-dimethylpropyl)thiocarbamate [
Generic name: Esprocarb, Compound No. Active ingredients of carbamate herbicides such as 9]; 1-(α,α-dimethylbenzyl)-3-(4-methylphenyl)urea [common name:
Daimeron, Compound No. 10], 1-(2-chloro[
Benzyl)-3-(α,α-dimethylbenzyl)urea [Test name: JC-940, Compound No. 11
urea herbicide active ingredients such as N-(α,α-dimethylbenzyl)-2-bromo-3,3-dimethylbutyramide [generic name: bromobutide, compound No. 12], N
-Methyl-2-(2-benzothiazolyloxy)acetanilide [generic name: mefenacet, compound No. 13
], 2',3'-dichloro-4-ethoxymethoxybenzanilide [Test name: HW-52, Compound No. 14]
, N-[2'(3'-methoxy)-thienylmethyl]-
N-chloroaceto-2,6-dimethylanilide [Test name: NSK-850, Compound No. 15], N-butoxymethyl-2-chloro-2',6'-diethylacetanilide [generic name: butachlor, compound No. 16], N
-Propoxyethyl-2-chloro-2',6'-diethylacetanilide [generic name: pretilachlor, compound No. 17]; amide herbicide active ingredients such as 2-(2-
naphthyloxy)propionanilide [generic name: naproanilide, compound No. 18], 2-(2,4-dichloro-3-methylphenoxy)propionanilide [generic name: clomeprop, compound No. Phenoxy herbicide active ingredients such as 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-pyrazolyl p-toluenesulfonate [generic name: pyrazolate, compound No. 19];
20], 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-phenacyloxypyrazole [generic name: pyrazoxifene, compound No. 21]
, 4-(2,4-dichloro-3-methylbenzoyl)-
1,3-dimethyl-5-(4-methylphenacyloxy)pyrazole [generic name: benzofenap, compound no.
．． 22], 5-benzyloxy-4-(2,4-dichlorobenzoyl)-1-methylpyrazole [Test name: NC
-310, Compound No. Pyrazole herbicide active ingredients such as 2,4,6-trichlorophenyl=4-nitrophenyl ether [generic name: chlornitrophen, compound No. 23]; 24], 2,4-dichlorophenyl 3-methoxy-4-nitrophenyl ether [generic name: chromethoxynil, compound No. 25], 2,4-dichlorophenyl=3-methoxycarbonyl-4-nitrophenyl ether [generic name: Bifenox, Compound No. 26
], 2-chloro-4-trifluoromethylphenyl=4
-Nitro-3-(tetrahydropyran-3-yloxy)phenyl ether [Test name: MT-124, Compound N
o. diphenyl ether herbicide active ingredients such as [27];
2-amino-3-chloro-1,4-naphthoquinone [generic name: ACN, compound No. Quinone herbicide active ingredients such as 28]; 2-[(4,6-dimethoxypyrimidine-2-
yl)aminocarbonylaminosulfonylmethyl] benzoic acid methyl ester [generic name: bensulfuron methyl,
Compound no. 29], 5-[(4,6-dimethoxypyrimidin-2-yl)aminocarbonylaminosulfonyl]-1-methylpyrazole-4-carboxylic acid ethyl ester [generic name: pyrazosulfuronethyl, compound No. ．． 30], 3-(4,6-dimethoxy-1,3,5-triazin-2-yl)-1-[2-(
2-methoxyethoxy)phenylsulfonyl]urea[
Generic name: Sinosulfuron, Compound No. 31], 1-(
2-chloroimidazo[1,2-a]pyridin-3-ylsulfonyl)-3-(4,6-dimethoxy-2-pyrimidinyl)urea [Test name: TH-913, Compound No. 3
2] and other sulfonylurea herbicide active ingredients; 5-te
rt-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-1,3,4-oxadiazole-2
(3H)-one [generic name: oxadiazone, compound No.
．． 33], 3,7-dichloro-8-quinolinecarboxylic acid [generic name: quinclorac, compound No. 34], 3-
Chloro-2-[2-fluoro-4-chloro-5-(1-
propynyloxy)phenyl]-4,5,6,7-tetrahydro-2H-indazole [Test name: S-275
, Compound No. 35], S,S-dimethyl=2-difluoromethyl-4-(2-methylpropyl)-6-trifluoromethyl-3,5-pyridinecarbothioate [generic name: dithiopyl, compound No. 36], 3-chloro-
4-Methyl-6-(N-2-chloro-2-propenyl-
N-phenylamino)pyridazine [Test name: MT-12
8, Compound No. Heterocyclic herbicide active ingredients such as [37] and the like can be used. It goes without saying that the herbicide active ingredients that can be used in the composition of the invention are not limited to the above-mentioned compounds. The active ingredients of these herbicides are
Depending on the type of weed to be weeded,
Alternatively, two or more types may be mixed and blended, and the blending ratio in the case of mixing can also be arbitrarily selected. Although the total content ratio of the herbicide active ingredients contained in the composition of the present invention can be selected as appropriate, it is desirable to select the total content ratio within a range of 60% or less by weight. Note that the compound No. are cited in the following description. [0025] The composition of the present invention may contain active ingredients such as insecticides, fungicides, plant growth regulators, or fertilizers as required, and may also be used in combination with these ingredients. The composition of the present invention can be produced by first finely pulverizing all or part of the solid components contained in the composition of the present invention using a dry grinder such as an air mill, pin mill, or hammer mill, and then adding the surfactant. The solid components contained in the composition of the present invention are mixed in water mixed with other components such as surfactants and thickeners, and then finely pulverized using a wet grinder such as a ball mill or sand mill. A method of dispersing while undergoing chemical treatment, a method of adding an aqueous dispersion such as a surfactant to the dispersion that has been atomized using a wet mill as described above, and a method of dispersing the solid components contained in the composition of the present invention in advance using a dry mill. Examples include a method in which the material is pulverized to some extent, dispersed in water together with other components such as a surfactant, and then further pulverized using the above-mentioned wet pulverizer. [0027] As a wet grinder, for example, a Visco mill,
Sand grinder (manufactured by Igarashi Kikai Seizo Co., Ltd.)
, Atliter (manufactured by Mitsui Miike Seisakusho Co., Ltd.), and Dyno Mill (manufactured by Willy A. Bachofen). The herbicide active ingredient in the composition of the present invention preferably has an average particle size of 10 μm or less, more preferably 0.5 μm or less.
It is desirable to pulverize to a particle size in the range of 1 to 5 μm. When the herbicide raw material is liquid at room temperature, for example, the surfactant can be prepared by mixing the raw material and a surfactant in advance and gradually adding an aqueous solution containing various auxiliary agents while stirring to uniformly disperse the surfactant. Examples of methods include mixing the raw material into an aqueous solution containing agents and various auxiliary agents, and further stirring to uniformly disperse the mixture. The order of adding the herbicide active ingredient, surfactant, amorphous aluminosilicate, water, and other sub-components related to the composition of the present invention may be changed as appropriate depending on the process or the foaming properties of the formulation. be able to. The composition of the present invention is an aqueous suspension composition that can reduce traces of chemical treatment on the surface of paddy soil, which can occur when the undiluted solution is directly applied dropwise to paddy fields, and furthermore, it can be dispersed in a short time and then It is a formulation that leaves little residue and poses no practical problems. The amount of the composition of the present invention to be used per 10 ares can be appropriately selected depending on the application situation, application period, application method, target grass species, etc., but is preferably 0.1 to 4 liters.
degree is desirable. The composition of the present invention can be sprayed as a undiluted solution, but it can also be diluted with water to an appropriate concentration and then sprayed. The amount of dilution can be selected as appropriate, but it is preferable to dilute the solution so that the amount of liquid after dilution is approximately 0.5 to 200 liters per 10 are. In addition, when the composition of the present invention is diluted in water and sprayed, if the composition of the present invention is suspended in water, the properties of the active ingredient itself, the type of water to be diluted, the water temperature, etc. It is not easily affected by various conditions and can provide a stable suspension state. The composition of the present invention can be used for herbicide spraying in flooded paddy fields, not only before rice planting, but also after rice transplantation, that is, after transplanting paddy rice. The composition of the present invention can be prepared by dropping the undiluted solution or diluted solution in water over the entire surface of a flooded paddy field, or by spraying it using a device such as a sprayer. In addition, during rice planting, a water drop operation is performed and water is entered after rice planting, but it is also possible to spray the drug in a state of falling water before entering the water, allowing the chemical to be evenly distributed over the field soil surface by entering the water. Furthermore, when entering water after rice planting, it is possible to spread the chemical over the entire surface of the rice field by directly dripping it into the inflowing water at the water intake of the rice field. EXAMPLES Next, Examples of formulations of the composition of the present invention and comparative examples of formulations of aqueous suspensions used for comparison will be described. In Examples and Comparative Examples, "parts" indicate parts by weight. It goes without saying that the present invention is not limited to these Examples. Example 1 A pin mill 160Z type [manufactured by Fuji Sangyo Co., Ltd.] was prepared in advance.
Compound NO. 2 In part 12,
6 parts of ethylene glycol, 0.15% xanthan gum + 0.15% guar gum aqueous solution 74.5
3 parts, amorphous aluminosilicate, Solpol 9838
After adding 2 parts of P [trade name, manufactured by Toho Chemical Industry Co., Ltd.], 2 parts of Solpol 9047K [trade name, manufactured by Toho Chemical Industry Co., Ltd.], and 0.5 part of silicone emulsion, and stirring with a high-speed stirrer, Hard glass beads with a diameter of 1 to 1.5 mm for grinding were added and finely ground using a four-barrel sand grinder (manufactured by Igarashi Kikai Seizo Co., Ltd.) to obtain a uniform suspension in water. In the following examples, the same operations as in Example 1 were carried out to obtain suspensions in water. The components of each example are described below. In addition, water was added in addition to each component to make a total of 100 parts. Example 2 Compound No. 1

15 parts ethylene glycol

Part 6 Wellan Gum
0.8% aqueous dispersion
28 parts Kunipia F [trade name, manufactured by Kunimine Kogyo Co., Ltd.] 5% aqueous dispersion 20
Part Amorphous Aluminosilicate

Part 2 Solpol 7678 [Product name,
Manufactured by Toho Chemical Industry Co., Ltd.] 1.5 parts
Solpol 7290P [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 1 part Silicon emulsion
0.5 part Example 3 Compound No. 2

12 parts ethylene glycol

8 parts Agrisol 10
4FA [Product name, manufactured by Kao Corporation]
12 parts Kunigel VA [trade name, manufactured by Kunimine Industries Co., Ltd.] 8% aqueous dispersion 16 parts Amorphous aluminosilicate
2nd part
KP-1436 [Product name, manufactured by Kao Corporation]
Part 2 T-
32 [Product name, manufactured by Toho Chemical Industry Co., Ltd.]
0.8 parts Surfynol 1
04E [Product name, manufactured by Air Products] 0.
Part 05 Silicon emulsion

0.5 part Example 4 Compound No. 24

35 parts ethylene glycol

Part 6 Wellan Gum 0
．． 8% water dispersion
Part 25 Knigel VA
8% water dispersion
12 parts amorphous aluminosilicate
3 parts
KP-1436

Part 2 Surfynol 104E

0.05 parts silicone emulsion

0.5 part Example 5 Compound No. 2

12 parts ethylene glycol

Part 6 Agrisol 10
0F [Product name, manufactured by Kao Corporation]
9 parts Kunipia F 5% aqueous dispersion

10 parts amorphous aluminosilicate
Part 3 KP-14
36
3
part Surfynol 440 [trade name, manufactured by Air Products Co., Ltd.] 0.05 parts Example 6 Compound No. 13

12 parts ethylene glycol

Part 6 Wellan Gum 0
．． 8% water dispersion
Part 30 Knigel VA
8% water dispersion
16 parts amorphous aluminosilicate
2nd part
KP-1436

Part 2 Surfynol 104E

0.05 parts silicone emulsion

0.5 parts [0045] In Examples 7 and 8 below, Compound No. 7, which is the herbicide active ingredient of Example 6, Replace only 13 with the following herbicide active ingredient,
Further, water was added so that the total amount of ingredients was 100 parts to obtain an aqueous suspension preparation. Example 7 Compound No. 25

25 parts Example 8 Compound No. 2

6 parts Compound No. 24

20 parts Example 9 Compound No. 2

12 parts Compound No. 16

8 parts ethylene glycol
6 parts
Welan gum 0.8% aqueous dispersion
28 parts
Kunipia F [trade name, manufactured by Kunimine Kogyo Co., Ltd.] 5% aqueous dispersion 20 parts Amorphous aluminosilicate
Part 2 Solpol 7
678 [Product name, manufactured by Toho Chemical Industry Co., Ltd.]
1.5 parts Solpol 7290P [trade name, manufactured by Toho Chemical Industry Co., Ltd.] 1 part Silicone emulsion
0.5 part Example 10 Compound No. 2

12 parts ethylene glycol

Part 6 Wellan Gum
0.8% aqueous dispersion
Part 28 Kunigel VA
8% water dispersion
14 parts amorphous aluminosilicate
1 part
KP-1436

2.2 Part T-32

0.8 parts Surfynol 104E
0.05 parts silicone emulsion
0.5 part [
In Examples 11 to 13 below, only the amount of amorphous aluminosilicate in Example 10 was replaced as shown below, and the total amount of ingredients was prepared with water to be 100 parts to prepare an aqueous suspension preparation. I got it. Example 11 Amorphous aluminosilicate
3
Section Example 12 Amorphous aluminosilicate
5
Section Example 13 Amorphous aluminosilicate
8
Comparative Examples 1 to 10 The same procedure as in Example 1 was carried out except that only the amorphous aluminosilicate was removed from Examples 1 to 10, and an equal amount of water was added instead so that the total component amount was 100 parts. A suspension in water was obtained by performing the following operation. Comparative Examples 1-10 correspond to Examples 1-10, respectively. Next, test examples conducted on the samples prepared in the above Examples and Comparative Examples are shown below. Test Example 1 Paddy soil was poured from the bottom into a plastic container with a diameter of 60 cm.
After the water was poured uniformly to a depth of 2.5 cm, the water was flooded to a depth of 2.5 cm. The next day, 0.3 ml of each stock solution of the aqueous suspensions prepared in the Examples and Comparative Examples was dropped into the plastic container from a height of 1 m. After dropping, observations were made every 30 minutes, and the time until the traces of chemical treatment were almost no longer visible was measured. The results obtained are shown in Table 1. [Table 1] Test Example 2 After plowing and plowing a rice field, paddy rice seedlings (variety: Yamahoshi) at the 3-leaf stage were transplanted using a rice transplanter. after that,
A 2 x 10 m plot was created using boards and ridge boards, and wild field seeds were sown all over the plot. The next day, 3-4 cm
The area was flooded with water. 6 days after transplanting paddy rice seedlings (nobies 0.5-1
During the leaf stage), a predetermined amount of each chemical was dripped in a streak from a height of 1 m only along one side of the 2 m long plot, parallel to the side, and at a distance of 30 cm from the side. For one drug and application amount, two plots were used, and drop spraying was performed only from opposite sides. [0056] On the day after the spraying, the appearance of the treatment marks in the chemically treated areas was observed and evaluated according to the following criteria. After that, 3～
A water depth of 4 cm was maintained. One month after the chemical treatment, the herbicidal effect and the chemical damage to paddy rice were observed and evaluated according to the following criteria. In addition, drug efficacy was evaluated up to 2 m from the side opposite to the side treated with the drug, and drug damage was evaluated up to 2 m from the side opposite the side treated with the drug, and the average of the two sections was calculated for each. The results obtained are shown in Table 2. [0057] Processing marks evaluation criteria No processing marks No processing marks Very slight Processing marks remain A few processing marks Medium Moderate Processing marks remain Most of the processing marks remain as they are 005
8] Criteria for determining herbicidal effectiveness
Criteria for determining paddy rice damage
evaluation
Evaluation Degree of chemical damage 5 100% control (residual weed amount 0%)
) − Harmless 4
80% control (residual weed amount 20%) ±
Minor damage 3 60% control (
Amount of remaining grass 40%) + Minor damage
2 40% control (residual weed amount 60%)
++ Medium damage 1
20% control (residual weed amount 80%) +++
Major damage 0 0% control (remaining amount of grass 1
[00%] It can reduce chemical treatment marks on the surface of paddy soil, which can occur when chemical treatments occur, and even if chemical treatment marks do occur, they diffuse in a short time and are less likely to remain behind, resulting in uneven effectiveness regardless of the type of active ingredient. Alternatively, it is an excellent formulation that does not easily cause chemical damage to transplanted paddy rice and has no practical problems. As described above, the composition of the present invention has excellent characteristics and is highly practical.

Claims (1)

[Claims] 1. An aqueous suspension composition comprising a sparingly water-soluble herbicide active ingredient, a surfactant, water, and an amorphous aluminosilicate.