JPH05294804A - Suspension-like herbicidal composition for paddy field - Google Patents

Abstract

PURPOSE:To obtain a suspension-like herbicidal composition having good long- term storage stability and fluidity and remarkably improved in workability in chemical treatment and capable of quickly and uniformly spreading and dispersing an active ingredient on water surface and in water. CONSTITUTION:The objective composition contains water as a dispersing medium, a herbicidally active ingredient, e.g. 2,4,6-trichloro-1-(4-nitrophenoxy)benzene (general name: chloronitrofen), 1-(alpha,alpha-dimethylbenzyl)-3-(p-tolyl)urea (general name: dymron) and a surfactant as humectant or dispersing agent and has >=40cm/sec (at 20 deg.C) initial water surface diffusing rate. In this composition, chloronitrofen and dymron of herbicidally active ingredients are stably suspended in water in a state of fine particles having 5.1-10.0mum particle diameter at 50% cumulative volume and this composition has physical properties of 200-600 mPa.sec (at 25 deg.C) viscosity and 21-35dye/cm (at 25 deg.C) surface tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses water as a dispersion medium and the herbicidal active ingredient 2,4,6-trichloro-1- (4-nitrophenoxy) benzene [hereinafter referred to as a general name: chlornitrophen]. ] And 1- (α, α-dimethylbenzyl) -3-
(P-Tolyl) urea [hereinafter, referred to as a general name: Daimlon]. ] The present invention relates to a suspension type herbicidal composition for paddy field, which is improved in storage stability, water surface spreadability or dispersibility in water, by mixing with a surfactant.

[0002]

2. Description of the Related Art A method for directly treating a flooded paddy field with a herbicidal composition for paddy fields, in which fine particles of a herbicidal active ingredient for paddy fields, which are poorly soluble in water, are dispersed and suspended together with a surfactant in water. Compared to the most commonly used methods for treating granules, wettable powders, and emulsions, it does not require a large amount of carrier, and is safe for workers, the environment and storage and transportation. In recent years, research and development have been actively conducted due to advantages such as easy processing and the like. Specifically, JP-A-60-214701, JP-A-62-45501, JP-A-62-84002, JP-A-62-87501, JP-A-62-289502, JP-A-63-107901, JP-A-3-107901. 44302 and the like are known.

Chlornitrophene as a herbicide for paddy fields containing herbicidal active ingredients chlornitrophene and Daimlon
Daimuron granules (trade name: Shouron ^{R M} granules) there is. When a suspension-type herbicidal composition containing the same herbicidal active ingredient as this chlornitrophene-Dymuron granule was produced based on the above-mentioned known technique, the herbicidal active ingredient amount was as high as 270 g of chloronitrophene and 210 g of Daimlon per 10 a of paddy field, which was efficient. Can not be crushed. Furthermore, since the true specific gravity of chlornitrophen is large, a high viscosity is required to maintain stable suspension uniformity for a long period of time, which makes it difficult to discharge from the container, and when treating paddy fields, the herbicidal active ingredient is And it will be submerged in the water without expanding the water quickly. As a result, uneven treatment of the chemicals occurs, resulting in uneven herbicidal effects and chemical damage to transplanted rice. Also,
If the viscosity is lowered to spread the water surface and water quickly and to improve the dischargeability from the container, fine particles of the herbicidal active ingredient will settle to the bottom of the container after a long period of time after production, and a strong hard There is a problem of storage stability such that it becomes difficult to re-disperse a cake formed by shaking it by hand.

[0004]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present inventors have found that in the herbicidal composition in suspension containing chlornitrophen and dimuron as herbicidal active ingredients, the storage stability and the stock solution treatment of the drug are Easy, the herbicidal active ingredient spreads and disperses quickly and evenly on the water surface and in water, and exerts the same herbicidal effect as conventional granules. Furthermore, it is a suspension form that does not show phytotoxicity to transplanted rice. As a result of intensive studies to develop a herbicidal composition, the present invention has been completed.

[0005]

According to the present invention, the herbicidal active ingredients chlornitrophen and dimuron are used as water as a dispersion medium, and an alkyl sulfate, alkyl sulfosuccinate, polyoxyethylene alkyl ether, and poly Contains one or more compounds selected from oxyethylene alkyl phenyl ether,
In addition, the inventors have found that a herbicidal composition for suspension in paddy fields, which is characterized by containing a surfactant lignin sulfonate as a dispersant, has excellent properties, and further studied variously to arrive at the present invention.

That is, according to the present invention, the herbicidal active ingredients chlornitrophen and dimuron are stably suspended in water in the form of fine particles of 5.1 to 10.0 μm, and the viscosity of this suspension is 2
00-600mPa ・ sec (25 ℃), surface tension 21-
It has a physical property of 35 dyne / cm (25 ° C) and an initial water surface expansion rate of 4.0 cm / sec (20 ° C) or more when treated on the water surface without being diluted with water. A suspended herbicidal composition for paddy fields. Therefore, the long-term storage stability is good, and when the drug is dropped directly onto the water surface,
The chemical treatment is easy, and the herbicidal active ingredient spreads quickly and evenly over the entire surface of the water without stagnation at the dripping site, then disperses and setstles in water and is uniformly adsorbed on the soil surface to form a stable treatment layer. , The amount of herbicidal active ingredient is 2/3 per 10a of paddy field compared to commercially available chlornitrophene-Dimuron granules
However, it has an excellent characteristic that it exhibits the same effect as granules and shows little chemical damage to transplanted paddy rice.

The amount of the herbicidal active ingredient contained in the paddy field suspended herbicidal composition of the present invention is 120 to 270 g, preferably 150 to 210 g of chlornitrophen per 10 a of paddy field.
Daimuron 90-210g, preferably 120-18
It is prepared so as to contain 0 g, and their mixing ratio can be arbitrarily selected.

The surfactant as a wetting agent used in the paddy field herbicidal suspension composition of the present invention is one selected from alkylsulfates, alkylsulfosuccinates, polyoxyethylene alkyl ethers and polyoxyethylene alkylphenyl ethers. Alternatively, it contains two or more kinds, and the content ratio is 0.1 to 5% by weight, preferably 0.2 to 3% by weight. The mixing can be optional.

The surfactant used as the dispersant in the paddy field suspended herbicidal composition of the present invention is a lignin sulfonate, and its content is 0.5 to 15% by weight, preferably 1 to 1.
It is 0% by weight.

By mixing these wetting agents and dispersants, if the initial water surface spreading rate is 4.0 cm / sec (20 ° C.) or more, the spreading on the water surface is relatively independent of the particle size. It is possible to obtain an agent having improved malleability or dispersibility in water and excellent long-term storage stability. In this case, since the surface tension becomes 21 to 35 dyne / cm, one of the characteristics is that the spreadability on the water surface is further increased.

If desired, the formulation of the present invention may contain a surfactant which has been conventionally used for agricultural chemical formulations. For example, alkylbenzene sulfonate, alkyl naphthalene sulfonate, naphthalene sulfonic acid formalin condensate salt, anionic surfactant such as polycarboxylic acid type polymer surfactant, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxy There are nonionic surfactants such as ethylene fatty acid ester, polyoxyethylene polypropylene block polymer, and acetylene glycol.

In the herbicidal composition for paddy field of the present invention, chlornitrophen and dimuron are used as herbicidal active ingredients, and in addition to a surfactant, an antifreezing agent, a thickener, an antifoaming agent and an antifungal agent may be added if necessary. Agents and the like can be added.

Examples of the antifreezing agent include propylene glycol and ethylene glycol.

Examples of the thickener include gum arabic, guar gum, xanthan gum, sodium alginate, carboxymethyl cellulose, polyvinyl alcohol, hydroxyethyl cellulose, methyl cellulose, bentonite, white carbon and the like.

Examples of the defoaming agent include silicon type and acetylene derivatives.

The suspension-type herbicidal composition for paddy fields of the present invention can be prepared by the known techniques described in the above publications and the like. For example, the herbicidal active ingredient chlornitrophen, dimuron, a method in which a surfactant and water are mixed at the same time and wet milled with a sand mill, sand grinder, dyno mill, or the herbicidal active ingredients chlornitrophen and dimuron are mixed at the same time, and a jet omizer etc. It can be prepared by pulverizing, compounding a surfactant, water, and other additives, and stirring and mixing with a homogenizer.

In order to apply the suspension-type herbicidal composition for paddy field of the present invention to the flooded paddy field easily and uniformly, it is generally in the range of 0.3 to 2.0 liters per 10 a of paddy field. Yes, and more preferably 0.5 to 1.0 liter. In addition, the treatment method can be carried out by placing it on the flow of inflow water from the water outlet, by dropping it directly from the ridge to the flooded sewage paddy, or by mounting it on a rice transplanter and dropping it. ..

[0018]

EXAMPLES Next, the excellent effects of the present invention will be specifically described with reference to Examples, but the Examples are merely illustrative and the present invention is not limited thereto.

Chlornitrophen, Daimlon, wetting agent, dispersant, defoaming agent and water are weighed, and high speed agitator POLY is used.
TRON ^R PT6000 [KINEMATICA AG
After pre-grinding and mixing for 10 minutes, DYNO ^R
-MILL KDL type [Willy A. Bachof
en AG Maschinenfabrik]. As grinding media φ1.0-1.
Approximately 400 g of 5 mm glass beads is placed in a 0.3-liter grinding tank, and this grinding tank is filled with about 150 ml / min.
The pre-milled mixture was fed at a flow rate of. After fine pulverization, a thickener and a fungicide were added, and Examples 1 to 6 and Comparative Examples 1 to 1 were added.
The suspended herbicidal composition for paddy shown in 3 was obtained.

Example 1 Ingredients Weight parts Chlornitrophene 27 parts Daimlon 21 Aerolol CT-1 1 [Dialkylsulfosuccinate: manufactured by Toho Chemical Industry Co., Ltd.] Newkalgen RX-B 5 [Sodium lignin sulfonate: Takemoto Yushi Co., Ltd.] )] Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.1 Water 40.2

Example 2 Ingredients Weight parts Chlornitrophene 18 parts Daimlon 14 Aeroroll CT-11 Newcalgen RX-B 5 Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.15 Water 56. 15

Example 3 Ingredients Weight parts Chlornitrophene 18 parts Daimlon 14 Paionin A-21 2.5 [Lauryl sulfate: manufactured by Takemoto Yushi Co., Ltd.] Paionin D-1110 0.5 [Polyoxyethylene lauryl ether: Takemoto Yushi ( Co., Ltd.] Newcalgen RX-B 5 Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.15 Water 54.15

Example 4 Ingredients Weight parts Chlornitrophene 18 parts Daimlon 14 Paionin D-410 1 [Polyoxyethylene nonyl phenyl ether: manufactured by Takemoto Yushi Co., Ltd.] Newkalgen RX-B 5 Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.15 Water 56.15

Example 5 Component Weight part Chlornitrophene 18 parts Daimlon 14 Aeroroll CT-11 Vanillex N 5 [Sodium lignin sulfonate: Sanyo Kokusaku Pulp Co., Ltd.] Propylene glycol 5 Defoamer 0.5 Antifungal agent 0 .2 Thickener 0.15 Water 56.15

Example 6 Component weight parts Chlornitrophene 18 parts Daimlon 14 Aerol CT-11 REAX 83A 5 [Sodium lignin sulfonate: manufactured by Westvaco] Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickening Agent 0.15 Water 56.15

Comparative Example 1 Component Weight part Chlornitrophene 27 parts Daimlon 21 Toxanone GR-50P 3 [Polycarboxylic acid type polymer activator: Sanyo Kasei Co., Ltd.] Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.1 Water 43.2

Comparative Example 2 Component Weight part Chlornitrophene 18 parts Daimlon 14 Aerol CT-11 Demol N 5 [Naphthalenesulfonic acid formalin condensate salt: Kao Corporation] Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.15 Water 56.15

Comparative Example 3 Component Weight part Chlornitrophene 18 parts Daimlon 14 Neoperex F-65 3 [Sodium dodecinebenzenesulfonate: manufactured by Kao Corporation] Newkalgen RX-B 5 Propylene glycol 5 Defoamer 0.5 Antifungal agent 0.2 Thickener 0.15 Water 54.15

[0029] Comparative Example 4 Shouron ^R M Granules [Corp. S. D. S. Biotech]

Test Example 1 Method of Measuring Initial Water Surface Spreading Rate A square of 1 m on each side and a depth of 8 cm in a PVC tank at 20 ° C.
Add tap water to a depth of 4 cm and let stand for 15 minutes. A 25 g weight is placed in a circular polyethylene container (13 g) having a diameter of 6 cm and a depth of 2 cm in the center, and the container is gently floated in the center of the water surface. Using a 1 ml Komagome pipette, gently drop 1 drop of the herbicidal suspension composition on the water surface 1 cm away from the polyethylene container at a height of 5 mm. Thereafter, the time required for the polyethylene container to move 30 cm by the water surface spreading force of the suspended herbicidal composition is measured with a stopwatch to determine the speed.

Test Example 2 Method of Measuring 50% Volume-Integrated Particle Size COULTER COUNTER ^R MODEL TA
II [COULTER ELECTRONICS, INC
Manufactured].

Test Example 3 Viscosity measuring method DIGITAL VISCOMETER DV H-B
Rotor No. by [Tokyo Keiki Co., Ltd.] Use 2
Rotor speed is 20 rpm and product temperature is 25 ℃.

Test Example 4 Method of Measuring Surface Tension A surface tension tester made by Mr. Dunois is used to measure the surface tension at 25 ° C.

Test Example 5 Cold and Heat Resistance Test 80 ml of the suspended herbicidal compositions obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were placed in a 100 ml candle bottle and the bottle was tightly stoppered at -5 ° C. , 24 hours and 50
After storing in a thermostat for 24 hours at a temperature of 24 ° C. for 30 days, it is observed whether a hard cake layer is formed on the bottom of the candle bottle. Hard cake-: No hard cake +: With a hard cake of less than 1 mm ++: With a hard cake of 1 mm or more The results of Test Examples 1 to 5 are shown in Table 1.

[0035]

[Table 1]

Test Example 6 Chemical damage to paddy rice A plastic container of 34 × 56 cm was filled with paddy soil, and after water was filled and dewatered, the water depth was kept at 3 cm, and the next day 2.3.
1 planting 1 plant per leafy rice seedling (variety: Koshihikari)
6 strains were transplanted at a depth of 3 cm and 3 cm, respectively. Immediately after transplanting the paddy rice, a predetermined amount of Examples 1 to 6 and Comparative Examples 1 to 3 was directly dropped by a pipette from a height of 20 cm above the submerged surface in the center of the plastic container. The water surface was directly treated so as to be even. It should be noted that the test is performed at room temperature of 23 to 30 ° C. for 3 hours.
It was carried out again. The survey was conducted on the 15th day after the chemical treatment, and the general condition of the degree of browning of the rice leaf blade was observed based on the following criteria.
On the day, the fresh weight of the foliage of the paddy rice was measured and the ratio of the untreated plots was calculated. The survey results are shown in Table 2.

[0037]

[Table 2]

Test Example 7 Herbicidal effect A plastic container of 34 x 56 cm was filled with paddy soil, the water depth was kept at 3 cm after water entry and substituting, and the next day, seedlings of sea bream and firefly were mixed-sown to a depth of 1 cm from the soil surface,
Eel and cypress were sown on the soil surface. 5 days after seeding (treatment time A) and 10 days after treatment (treatment time B)
Then, the same treatment as in Test Example 6 was performed. The test is 23 ~
It was carried out in a glass at room temperature of 30 ° C. 20 investigations after drug treatment
The general conditions were observed daily and the herbicidal effect was evaluated.
The survey results are shown in Table 3.

[0039]

[Table 3]

[0040]

The composition of the present invention containing chlornitrophen and dimuron as herbicidal active ingredients has a surfactant as a wetting agent such as alkyl sulfate, alkyl sulfosuccinate, polyoxyethylene alkyl ether, and polyoxyethylene alkylphenyl. It contains one or more compounds selected from ethers, and by mixing with a surfactant lignin sulfonate as a dispersant, good long-term storage stability and good fluidity , The workability during drug treatment was significantly improved. Further, since the herbicidal active ingredient spreads rapidly and uniformly on the water surface and in water, it is as high as or more than the same as the granule even with an amount of the herbicidal active ingredient which is 2/3 that of the conventional granule. It was confirmed that the safety in terms of chemical damage is increased.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsukasa Watanabe 2-1-1 Midorigahara, Tsukuba, Ibaraki Prefecture SDS Biotech Tsukuba Research Institute (72) Inventor Yuji Yamada 2-chome, Midorigahara, Tsukuba, Ibaraki No. 1 Stock Company SDS Biotech Tsukuba Research Center

Claims (6)

[Claims] 1. A water as a dispersion medium, a herbicidal active ingredient and a surfactant are blended, and an initial water surface spreading rate is 4.0 cm / sec.
A suspended herbicidal composition for paddy fields having physical properties of (20 ° C.) or higher. 2. The volume cumulative 50% particle size is 5.1 to 10.0.
The suspension herbicidal composition for paddy fields according to claim 1, which has various physical properties of μm, viscosity of 200 to 600 mPa · sec (25 ° C.), and surface tension of 21 to 35 dyne / cm (25 ° C.). .. 3. The herbicidal active ingredients are 2,4,6-trichloro-1- (4-nitrophenoxy) benzene and 1- (α,
The suspended herbicidal composition for paddy fields according to claim 1 or 2, which is α-dimethylbenzyl) -3- (p-tolyl) urea. 4. A surfactant as a wetting agent contains one or more compounds selected from alkyl sulfates, alkyl sulfosuccinates, polyoxyethylene alkyl ethers, and polyoxyethylene alkyl phenyl ethers, The suspended herbicidal composition for paddy fields according to claim 1, 2 or 3, wherein the surfactant as a dispersant is a lignin sulfonate. 5. The herbicidal active ingredient is 2 per 10a of paddy field.
The method of preparing 120-270 g of 4,6-trichloro-1- (4-nitrophenoxy) benzene and 90-210 g of 1- (α, α-dimethylbenzyl) -3- (p-tolyl) urea. The suspended herbicidal composition for paddy fields according to 1, 2, 3 or 4. 6. The herbicidal composition for paddy fields according to claim 1, 2, 3, 4 or 5, wherein the wetting agent is 0.1 to 5% by weight and the dispersant is 0.5 to 15% by weight. ..