JP5944140B2 - Controlled release pesticide granules - Google Patents

Description

  The present invention relates to an agrochemical granule that is controlled so that an agrochemical active ingredient is gradually released after spraying.

  With the recent increase in social awareness of environmental issues and safety, there is an increasing need for a control technique that releases an appropriate amount of an agrochemical active ingredient over a necessary period. That is, it is required to reduce the amount used by improving the effective utilization rate of the sprayed pesticidal active ingredient and to suppress environmental pollution due to the runoff of the extra pesticidal active ingredient. Furthermore, since controlled release can maintain the efficacy for a long time, it has important advantages such as saving labor by reducing the number of spraying of agricultural chemicals to farmers and preventing phytotoxicity caused by contact with high concentration of agricultural chemical active ingredients. Yes.

  The following are examples of controlled release studies related to conventional agrochemical granules. Particles composed of a herbicidal compound and a wax-like substance are used as inner grain nuclei, and the herbicidal compound is adhered to the surface (Patent Document 1), and the agrochemical granules are coated with a resin coating mainly composed of a thermosetting resin. Coated pesticide granules (Patent Document 2), granular pesticide composition coated with water-insoluble alginate (Patent Document 3), granular pesticide composition impregnated with a hydrophobic substance, and further covered with hydrophobic fine powder (Patent Document 4), a sulfonylurea herbicidal active ingredient, activated carbon, paraffin wax, and a mineral carrier (Patent Document 5). However, these techniques require a multi-step granulation process in order to provide the function of elution control, and are difficult compared to ordinary granulation. Moreover, the effect of suppressing release is not always sufficient.

Further, there is a controlled release granule (Patent Document 6) using an ethylene-acrylic acid copolymer emulsion. However, when it is desired to suppress the release for a long period of time, the effect of suppressing the release is not always sufficient. That is, when trying to suppress elution more, elution can be suppressed by increasing the amount of the ethylene-acrylic acid copolymer emulsion, but the water added during granulation has a problem of granulation. This is because a resin emulsion containing a large amount of water is restricted by the amount added.
Japanese Patent Laid-Open No. 9-110605 Japanese Patent Laid-Open No. 11-5704 JP-A-7-101804 JP-A-2-286602 JP 63-35504 A JP 2001-55303 A

  The object of the present invention is to develop an agrochemical granule that has good granulation properties, and suppresses the release rate of the agrochemical active ingredient when it is sprayed on nursery boxes, paddy fields, and upland fields, and the release is controlled over a long period of time.

  As a result of diligent research to solve the above-mentioned problems, the inventors of the present invention kneaded and extruded a powdery hydrophobic substance having a melting point of 40 to 150 ° C. with an aqueous dispersion of a water-insoluble resin, It was found that by drying at a temperature equal to or higher than the melting point of the active substance, an agrochemical granule having good granulation property and excellent elution suppression ability was obtained, and the present invention was completed.

  That is, the present invention kneads and extrudes a mixture of (A) an agrochemical active ingredient, (B) an aqueous dispersion of a water-insoluble resin, and (C) a powdery hydrophobic substance having a melting point of 40 to 150 ° C. The present invention relates to an agrochemical granule obtained by drying at a temperature equal to or higher than the melting point of the component (C).

  The controlled release agrochemical granule obtained by the present invention has a long elution period by suppressing the elution rate, so that the residual effect becomes high and the long-term control after spraying is possible. It can be reduced and labor saving becomes possible. Moreover, many effects, such as suppressing the runoff of the pesticidal active ingredient due to heavy rain or leakage, and avoiding the risk of phytotoxicity since the pesticidal active ingredient does not become unnecessarily high in concentration immediately after spraying, are obtained.

  Hereinafter, the present invention will be described in detail.

  The (A) pesticidal active ingredient in the present invention is not limited to a solid or liquid, but can be various, and can be used alone or in combination. (A) In the case where the pesticidal active ingredient is a liquid and the addition amount is large, an appropriate amount of highly oil-absorbing powder such as white carbon may be added. About content in an agrochemical granule, it is 0.1-90 mass%, What is necessary is just to determine taking into consideration a required processing amount.

  The aqueous dispersion of (B) water-insoluble resin in the present invention is prepared by, for example, adding a resin and water, and if necessary, a neutralizing agent and an emulsifier to a device capable of being pressurized and having a normal shearing force, and a temperature above the melting point of the resin. It can be obtained by stirring while raising the temperature. Although it does not specifically limit as water-insoluble resin, Specifically, the following can be used.

  As the water-insoluble resin, a copolymer of an α, β-ethylenically unsaturated carboxylic acid and an olefin can be preferably used. The copolymer of α, β-ethylenically unsaturated carboxylic acid and olefin used in the present invention contains 50% by mass or more of olefin-derived structural units (that is, α, β-ethylenically unsaturated carboxylic acid). This refers to a copolymer containing 50 mass% or less of an acid-derived structural unit, and is a copolymer obtained by copolymerizing an olefin and an unsaturated carboxylic acid by a known method. Examples of the mode include a random copolymer, a block copolymer, and a copolymer grafted with an unsaturated carboxylic acid.

  Examples of the olefin used in the copolymer include ethylene and propylene, and ethylene is most preferable. Examples of the α, β-ethylenically unsaturated carboxylic acid used in the copolymer include monocarboxylic acids such as acrylic acid, methacrylic acid, crotonic acid and isocrotonic acid, and dicarboxylic acids such as maleic acid, fumaric acid and itaconic acid. Although an acid can be mentioned and it is not specifically limited to these, Preferably it is acrylic acid.

  The weight average molecular weight of the copolymer of α, β-ethylenically unsaturated carboxylic acid and olefin in the present invention is 1,000 to 100,000, but when it is used as an aqueous resin composition, it is a viewpoint of dispersibility in water. Therefore, it is preferably 3,000 to 70,000. Moreover, the content ratio of the structural unit derived from the α, β-ethylenically unsaturated carboxylic acid in the copolymer is preferably 5 to 30% by mass with respect to the total mass of the copolymer, and 10 to 25% by mass. % Is more preferable.

  Moreover, the copolymer of the olefin and α, β-ethylenically unsaturated carboxylic acid used in the present invention may contain structural units derived from other monomers within a range not impairing the effects of the present invention. . In the copolymer of olefin and α, β-ethylenically unsaturated carboxylic acid, the content of the structural unit derived from other monomer is preferably 10% by mass with respect to the total mass of the copolymer. Hereinafter, it is more preferably 5% by mass or less. However, the most preferred copolymer of olefin and α, β-ethylenically unsaturated carboxylic acid is an ethylene-acrylic acid copolymer.

  In order to obtain an aqueous dispersion of a copolymer of α, β-ethylenically unsaturated carboxylic acid and olefin, the carboxyl group in the copolymer is partially neutralized or completely neutralized using a neutralizing agent. Is preferred. Examples of the neutralizing agent used here include strong bases such as ammonia water, primary amines, secondary amines, tertiary amines, hydroxides of alkali metals or alkaline earth metals, and among these, Sometimes volatile ammonia is desirable. Although the blending amount of the neutralizing agent is not particularly limited, in order to reduce the blending amount of the emulsifier and to make the viscosity of the aqueous dispersion in a suitable range in terms of handling properties, α, β-ethylenically unsaturated carboxylic acid and 0.1-1.0 equivalent is preferable with respect to all the carboxyl groups in the copolymer with an olefin.

  As the water-insoluble resin in the present invention, in addition to a copolymer of α, β-ethylenically unsaturated carboxylic acid and olefin, polyolefin, oxidized polyolefin, polylactic acid, ethylene-vinyl acetate copolymer, ethylene-belova copolymer Examples thereof include, but are not limited to, a styrene-acrylic acid copolymer, a styrene- (anhydride) maleic acid copolymer, and an acrylic-silicone copolymer. These resins can be used alone or in combination. The content of the resin in the agrochemical granule is preferably 0.1 to 20% by mass, more preferably 1 to 10% by mass in terms of solid content.

  As the emulsifier, conventionally known surfactants such as nonionic surfactants, anionic surfactants, and cationic surfactants can be used, but depending on the purpose, the expression of the effects of the invention is not inhibited. It is desirable to select the type and amount used. Nonionic surfactants include polyoxyethylene octyl ether, polyoxyethylene decyl ether, polyoxyethylene dodecyl ether, polyoxyethylene myristyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene Oxyethylene isostearyl ether, polyoxyethylene behenyl ether, polyoxyethylene-2-ethyl-hexyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl ether (synthetic system), narrow type polyoxyethylene alkyl ether, polyoxy Ethylene octyldodecyl ether, polyoxyethylene styrenated phenyl ether, polyoxyethylene β-naphthyl ether, Polyoxyethylene hydrogenated castor oil ether, polyethylene glycol monoalkyl fatty acid esters, polyethylene glycol fatty acid esters, and polyoxyethylene sorbitan monolaurate and the like.

  In addition, since it may be difficult to obtain a stable aqueous dispersion only with a nonionic surfactant, it is desirable to use an anionic surfactant, a reactive surfactant, a polymer dispersant and the like in combination. Examples of the anionic surfactant include semi-cured tallow fatty acid soap Na salt, stearic acid soap Na salt, oleic acid soap K salt, gum rosin disproportionated rosin sodium salt, alkenyl succinic acid dipotassium salt, dodecyl sulfate Na salt, polyoxy Examples thereof include ethylene alkyl (C12, C13) ether sulfate Na salt, polyoxyethylene dodecyl sulfate ammonium salt, dodecylbenzene sulfonate Na salt, higher alkyl monoamine salt and trialkyl ammonium salt as cationic activator. In addition, reactive surfactants include alkylpropenylphenol polyethylene oxide adducts and their sulfate esters, allyl alkylphenol polyethylene oxide adducts and their sulfate esters, allyl dialkylphenol polyethylene oxide adducts and their sulfate esters. And compounds having a reactive double bond such as Although various compounds can be used as the polymer dispersant, a polycarboxylic acid polymer dispersant having a plurality of carboxyl groups in the molecule, a polyamine polymer dispersion having a plurality of amino groups in the molecule Preferred are an agent, a polymer dispersant having a plurality of amide groups in the molecule, and a polymer dispersant containing a plurality of polycyclic aromatic compounds in the molecule.

  In the present invention, (C) a powdery hydrophobic substance having a melting point of 40 to 150 ° C. includes petroleum wax, synthetic wax, mineral wax, animal and plant wax, higher alcohol, fatty acid, fatty acid ester, rosin, disproportionated rosin, Although rosin ester etc. can be mentioned, it is not limited to these. Examples of petroleum waxes include paraffin wax, isoparaffin wax, alcohol type wax, cycloparaffin wax, and microcrystalline wax. Examples of the synthetic wax include Fischer-Tropsch wax and polyethylene wax. Examples of animal and plant waxes include carnauba wax, rice wax, beeswax wax, hardened palm oil, and hardened beef tallow oil. Examples of alcohol include stearyl alcohol and behenyl alcohol. Examples of fatty acids include palmitic acid and stearic acid. Examples of fatty acid esters include ethylene glycol distearate and polyethylene glycol distearate. Examples of the rosin ester include rosin / glycerin ester, rosin / pentaerythritol ester, disproportionated rosin / glycerin ester, disproportionated rosin / pentaerythritol ester, hydrogenated rosin / glycerin ester, hydrogenated rosin / pentaerythritol ester, and the like. .

  The above-mentioned hydrophobic substance may be powdered by any means as long as it has a melting point of 40 to 150 ° C. and is in the form of powder, but has a melting point of 50 to 90 ° C. and an average particle size Those having a diameter of 400 μm or less are preferred. Moreover, 0.5-40 mass% is preferable and, as for the preferable content in the agrochemical granule, 1-25 mass% is especially preferable.

  The agrochemical granule of the present invention is obtained by kneading and extruding a mixture containing the components (A) to (C) as essential components and drying at a temperature equal to or higher than the melting point of the component (C). is there. Specifically, for example, first, an agrochemical active ingredient, a powdery hydrophobic substance having a melting point of 40 to 150 ° C., and a carrier such as a clay mineral substance described later are mixed, an aqueous dispersion of a water-insoluble resin, and further if necessary. After kneading by adding water, it is granulated by an extruder, dried at a temperature higher than the melting point of the hydrophobic substance, preferably 5 ° C. higher than the melting point, and can be obtained through sizing.

  The agrochemical granule of the present invention can be used not only for various agrochemical active ingredients but also has advantages such as easy production and suitable for mass production, and is produced by the kneading extrusion granulation method which is the most mainstream method. be able to. That is, no special process or equipment investment is required to provide a release control function as in the prior art, and the cost and ease of the manufacturing process are excellent, and the practicality is high.

  If necessary, water-soluble binders such as clay minerals, granulation accelerators, and binders may be added to the agricultural chemical granules of the present invention.

  Examples of clay minerals include, but are not limited to, wax, talc, kaolin, clay, calcium carbonate, bentonite, silica powder, diatomaceous earth powder, gypsum, and pumice powder. These clay minerals can be used alone or in combination. A compounding quantity is 0-95 mass%, and should just be determined according to the compounding quantity of an agrochemical active ingredient.

  As the granulation accelerator, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate, dialkyl allyl sulfonate, alkenyl sulfonate, higher fatty acid alkyl taurine salt, alkyl Nonionic surfactants such as anionic surfactants such as sulfosuccinates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene styryl phenyl ethers can be exemplified, but are not limited thereto. . These granulation accelerators can be used alone or in combination. About a compounding quantity, it is 0-10 mass%, Preferably it is 0.1-5 mass%.

  Examples of the binder include, but are not limited to, polyvinyl alcohol, polyacrylate, polyvinyl pyrrolidone, sodium lignin sulfonate, starch, gelatin, carboxymethyl cellulose, sodium alginate and the like. These binders can be used alone or in combination. About a compounding quantity, it is 0-20 mass%, Preferably it is 1-10 mass%.

  The present invention will be described more specifically with reference to examples, but is not limited to the following unless it exceeds the gist. In Examples and Comparative Examples, (A) 2,2-bis (4-hydroxyphenyl) propane is used as an agrochemical active ingredient.

Example 1
2,2-bis (4-hydroxyphenyl) propane 6 parts by weight, clay 75 parts by weight, α-olefin sulfonate sodium 2 parts by weight and polyvinyl alcohol 2 parts by weight, paraffin wax (shape: powder, melting point: 69 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount of water was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain an agrochemical granule.

(Example 2)
2,2-bis (4-hydroxyphenyl) propane 6 parts by mass, clay 75 parts by weight, sodium α-olefin sulfonate 2 parts by mass and polyvinyl alcohol 2 parts by mass, microcrystalline wax (shape: powder, melting point: 84 ° C.) After mixing 10 parts by mass, 14.3 parts by mass (solid content 35%) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] 5 parts by mass of the mold), the required amount was added, kneaded, granulated by an extruder, dried at 90 ° C., and sized to obtain an agrochemical granule.

(Example 3)
2,2-bis (4-hydroxyphenyl) propane 6 parts by mass, clay 75 parts by weight, sodium α-olefin sulfonate 2 parts by mass and polyvinyl alcohol 2 parts by mass, polyethylene (shape: powder, melting point: 79 ° C.) 10 parts by mass 14.3 parts by mass (solid content) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Industry Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount of water was added, kneaded, granulated by an extruder, dried at 90 ° C., and sized to obtain an agrochemical granule.

Example 4
2,2-bis (4-hydroxyphenyl) propane 6 parts by mass, clay 75 parts, alpha-olefin sulfonate 2 parts by mass and polyvinyl alcohol 2 parts by mass, stearyl alcohol (shape: powder, melting point: 58 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain agrochemical granules.

(Example 5)
2,2-bis (4-hydroxyphenyl) propane 6 parts by mass, clay 75 parts by weight, α-olefin sulfonate sodium 2 parts by mass and polyvinyl alcohol 2 parts by mass, behenyl alcohol (shape: powder, melting point: 69 ° C.) 10 parts by mass 14.3 parts by mass (solid content) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Industry Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount of water was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain an agrochemical granule.

(Example 6)
2,2-bis (4-hydroxyphenyl) propane 6 parts by weight, clay 75 parts by weight, sodium α-olefin sulfonate 2 parts by weight and polyvinyl alcohol 2 parts by weight, carnauba wax (shape: powder, melting point: 83 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount of water was added, kneaded, granulated by an extruder, dried at 90 ° C., and sized to obtain an agrochemical granule.

(Example 7)
6 parts by mass of 2,2-bis (4-hydroxyphenyl) propane, 75 parts by mass of clay, 2 parts by mass of sodium α-olefin sulfonate and 2 parts by mass of polyvinyl alcohol, 10 parts of rice wax (shape: powder, melting point 78 ° C.) 14.3 parts by mass (solid content) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Industry Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount of water was added, kneaded, granulated by an extruder, dried at 90 ° C., and sized to obtain an agrochemical granule.

(Example 8)
2,2-bis (4-hydroxyphenyl) propane 6 parts by weight, clay 75 parts by weight, sodium α-olefin sulfonate 2 parts by weight and polyvinyl alcohol 2 parts by weight, candelilla wax (shape: powder, melting point 71 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain agrochemical granules.

Example 9
2,2-bis (4-hydroxyphenyl) propane 6 parts by weight, clay 75 parts by weight, α-olefin sodium sulfonate 2 parts by weight and polyvinyl alcohol 2 parts by weight, hardened palm oil (shape: powder, melting point 59 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain agrochemical granules.

(Example 10)
2,2-bis (4-hydroxyphenyl) propane 6 parts by mass, clay 75 parts, sodium α-olefin sulfonate 2 parts by mass and polyvinyl alcohol 2 parts by mass, beef tallow oil (shape: powder, melting point 54 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain agrochemical granules.

(Example 11)
6 parts by mass of 2,2-bis (4-hydroxyphenyl) propane, 75 parts by mass of clay, 2 parts by mass of sodium α-olefin sulfonate and 2 parts by mass of polyvinyl alcohol, paraffin wax (shape: powder, melting point: 69 ° C.) 10 After mixing parts by mass, 10 parts by mass of ethylene-vinyl acetate copolymer aqueous dispersion [trade name: SORPOL 7871 (product of Toho Chemical Co., Ltd.)] (solid content: 50%) (solid content: 5 parts by mass) In addition, the required amount of water was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain an agrochemical granule.

(Example 12)
6 parts by mass of 2,2-bis (4-hydroxyphenyl) propane, 75 parts by mass of clay, 2 parts by mass of sodium α-olefin sulfonate and 2 parts by mass of polyvinyl alcohol, stearic acid (shape: powder, melting point: 59 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount of water was added, kneaded, granulated by an extruder, dried at 80 ° C., and sized to obtain an agrochemical granule.

(Comparative Example 1)
After mixing 6 parts by weight of 2,2-bis (4-hydroxyphenyl) propane, 90 parts by weight of clay, 2 parts by weight of sodium α-olefin sulfonate and 2 parts by weight of polyvinyl alcohol, the required amount is added and kneaded by an extruder. After granulation, drying and sizing were performed at 80 ° C. to obtain agrochemical granules.

(Comparative Example 2)
After mixing 6 parts by mass of 2,2-bis (4-hydroxyphenyl) propane, 85 parts by mass of clay, 2 parts by mass of sodium α-olefin sulfonate and 2 parts by mass of polyvinyl alcohol, ethylene-acrylic acid copolymer water dispersion 14.3 parts by mass (product name: HYTEC S-3127 (product of Toho Chemical Industry Co., Ltd.)) (solid content: 35%) (solid content: 5 parts by mass), water is added in the required amount, and kneading is performed using an extruder. After granulation, drying and sizing were performed at 80 ° C. to obtain agrochemical granules.

(Comparative Example 3)
After mixing 6 parts by mass of 2,2-bis (4-hydroxyphenyl) propane, 80 parts by mass of clay, 2 parts by mass of sodium α-olefin sulfonate and 2 parts by mass of polyvinyl alcohol, ethylene-acrylic acid copolymer water dispersion [Product name: HYTEC S-3127 (product of Toho Chemical Industry Co., Ltd.)] (solid content 35%) was added to 28.6 parts by mass (solid content 10 parts by mass), and the required amount was added and kneaded by an extruder. After granulation, drying and sizing were performed at 80 ° C. to obtain agrochemical granules.

(Comparative Example 4)
After mixing 6 parts by mass of 2,2-bis (4-hydroxyphenyl) propane, 75 parts by mass of clay, 2 parts by mass of sodium α-olefin sulfonate and 2 parts by mass of polyvinyl alcohol, ethylene-acrylic acid copolymer water dispersion [Product name: HYTEC S-3127 (product of Toho Chemical Industry Co., Ltd.)] (solid content 35%) was added to 42.9 parts by mass (solid content 15 parts by mass), and the required amount was added and kneaded by an extruder. After granulation, drying and sizing were performed at 80 ° C. to obtain agrochemical granules.

(Comparative Example 5)
2,2-bis (4-hydroxyphenyl) propane 6 parts by mass, clay 80 parts by mass, α-olefin sodium sulfonate 2 parts by mass and polyvinyl alcohol 2 parts by mass, paraffin wax (shape: powder, melting point: 69 ° C.) 10 After mixing parts by mass, the required amount was added, kneaded, granulated with an extruder, dried at 80 ° C., and sized to obtain an agrochemical granule.

(Comparative Example 6)
2,2-bis (4-hydroxyphenyl) propane 6 parts by weight, clay 75 parts by weight, α-olefin sulfonate sodium 2 parts by weight and polyvinyl alcohol 2 parts by weight, paraffin wax (shape: powder, melting point: 69 ° C.) 10 After mixing parts by mass, 14.3 parts by mass (solid form) of ethylene-acrylic acid copolymer aqueous dispersion [trade name: HYTEC S-3127 (product of Toho Chemical Co., Ltd.)] (solid content 35%) 5 parts by mass), the required amount was added, kneaded, granulated by an extruder, dried at 40 ° C., and sized to obtain agrochemical granules.

(Comparative Example 7)
After mixing 6 parts by weight of 2,2-bis (4-hydroxyphenyl) propane, 85 parts by weight of clay, 2 parts by weight of sodium α-olefin sulfonate and 2 parts by weight of polyvinyl alcohol, ethylene-vinyl acetate copolymer water dispersion [Product name: SORPOL 7871 (product of Toho Chemical Industry Co., Ltd.)] (solid content 50%) was added 10 parts by mass (solid content 5 parts by mass), the required amount was added, kneaded, granulated by an extruder, Drying and sizing was performed at 80 ° C. to obtain an agrochemical granule.

<Granulation property confirmation test>
The appearance of the granulated product that came out of the extruder was visually confirmed and evaluated according to the following criteria.
○: Granulated products do not adhere to each other and can be produced satisfactorily.
X: Granulated materials adhere to each other and cannot be produced.

<Dissolution test>
Put 400 ml of hard water 3 times into a 500 ml cap container. Thereto, 0.16 g of the agrochemical granules prepared in Examples 1 to 11 and Comparative Examples 1, 2, 5 to 7 are dispersed. The container is set on a shaker, and an acceleration test at 150 reciprocations / minute is performed for 24 hours. After standing for 1 hour, water is collected from a depth of 4 cm at the center of the container, the concentration of the pesticidal active ingredient in the collected water is measured by liquid chromatography, and the amount of the pesticidal active ingredient eluted in 400 ml of 3 degree hard water is measured. Calculated. The elution rate was calculated with the concentration when the pesticide active ingredient in the test pesticide granule was completely eluted as the elution rate of 100%.

  The results obtained by the dissolution test are shown in Table 1.

  As is clear from the results in Table 1 above, the pesticidal granules of Examples 1 to 12 have better granulation properties than the pesticidal granules of Comparative Examples, and more 2,2-bis (4-hydroxyphenyl). Propane release is suppressed. The agrochemical granules using the resin water dispersions of Examples 1 to 12 and the powdered hydrophobic substance can be granulated and the elution rate can be kept low.

  On the other hand, in the case where the powdery hydrophobic substance is not included and the elution control agent is only the resin water dispersion as in Comparative Examples 2 and 7, granulation is possible but the elution rate is increased. If the amount of the resin water dispersion used to suppress elution is increased as in Comparative Examples 3 and 4, granulation cannot be performed in the first place. Further, even in the case of an agrochemical granule in which a resin water dispersion and a powdered hydrophobic substance are used together as in Comparative Example 6, the elution rate is high when the drying temperature of the granule is lower than the melting point of the powdered hydrophobic substance.

Claims (3)

(A) an agrochemical active ingredient, (B) an aqueous dispersion of a water-insoluble resin, and (C) a powdery hydrophobic substance having a melting point of 40 to 150 ° C., kneaded, extruded and granulated. The manufacturing method of the agrochemical granule dried at the temperature more than melting | fusing point of the said (C) component. The method for producing an agrochemical granule according to claim 1, wherein the water-insoluble resin is a copolymer of an α, β-ethylenically unsaturated carboxylic acid and an olefin. (C) Powdery hydrophobic substances having a melting point of 40 to 150 ° C. are paraffin wax, microcrystalline wax, polyethylene, stearic acid, stearyl alcohol, behenyl alcohol, carnauba wax, rice wax, beeswax wax, hardened palm oil and beef tallow The manufacturing method of the agrochemical granule of Claim 1 or 2 which is 1 type, or 2 or more types chosen from the group which consists of hydrogenated oil.