JPH04352701A - Granule for agricultural chemical - Google Patents

Abstract

PURPOSE:To obtain the subject new granule by using a mixture of a water-soluble adhesive with a water-insoluble adhesive as an adhesive in coating an oil unabsorbing granular carrier with an absorbing fine granule containing an agricultural chemical active ingredient or the agricultural chemical active ingredient. CONSTITUTION:A coated type granule for an agricultural chemical obtained by adding a mixture solution of a water-soluble adhesive such as polyvinylpyrrolidone and a water-insoluble adhesive such as an emulsion of a copolymer of ethylene and vinyl acetate as an adhesive to an oil unabsorbing granular carrier such as calcium carbonate, silica sand or glass beads while stirring the mixture, thereby homogeneously coating the carrier with the adhesive, then adding absorbing fine powder (e.g. synthetic calcium silicate) containing an agricultural chemical active ingredient or the agricultural chemical active ingredient itself while stirring the mixture and coating the oil unabsorbing granular carrier therewith. The aforementioned granule for the agricultural chemical is excellent, has high effects even with a small amount of the chemical and can safely be employed even in use such as spraying without a fear of causing phytotoxicity.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a novel coated agricultural chemical granule.This agricultural chemical granule has no risk of chemical damage, has high efficacy even in a small amount, and is suitable for spraying, etc. The present invention relates to an excellent agrochemical granule that can be safely used even when used in the field, and a method for producing the granule.

0002

BACKGROUND OF THE INVENTION In recent years, the use of granules has become popular in the control of crop pests and weeding because of their labor-saving and safety aspects during spraying, and they are used in the fields of insecticidal, sterilizing, and weeding. There are generally three types of pesticide granules known: granules made by extrusion granulation, granules made by adsorption, and granules made by coating. The optimal form is selected.

[0003]Generally excellent granules for agricultural chemicals include (1)
) Ability to fully demonstrate the efficacy of pesticide active ingredients (2)
(3) Must be safe for workers during use (4) The active ingredients of the granules must not decompose over a long period of time during storage. Granules that have the above effects at the same time. agent is ideal.

[0004] In order to exhibit excellent effects as a pesticide granule, it is necessary to release the pesticide active ingredient from the granule as completely as possible, and to this end, various measures have been taken for each granule dosage form. must be done. In coated granules, since the pesticide active ingredient is distributed at a high concentration on the surface of the non-oil-absorbing granular carrier, it is relatively easy to completely release the pesticide active ingredient. For this reason, coated granules can be expected to have higher effects even at lower doses than other types of granules. However, with coated granules, the agrochemical active ingredient is distributed in high concentration only on the surface of the carrier, so it is easy to cause chemical damage to crops, and there are concerns about the safety of workers during use. There is also a problem.

[0005]

[Means for solving the problem] Coated granules tend to cause chemical damage to crops, and there are also safety issues for workers when using them. It is extremely important to ensure that the release from the drug is as gradual as possible. As a result of various studies to solve the above problems, the present inventors found that
The solution is to use a mixture of a water-soluble adhesive and a water-insoluble adhesive as the adhesive when coating a non-oil-absorbing granular carrier with an absorbent fine powder containing an agrochemical active ingredient or the agrochemical active ingredient itself. The present invention was completed based on the discovery that the present invention can be achieved.

That is, the present invention provides a method for coating a non-oil-absorbing granular carrier with absorbent fine powder containing an agrochemical active ingredient or the agrochemical active ingredient itself, using a water-soluble adhesive and a water-insoluble adhesive as adhesives. The present invention relates to a coated agrochemical granule characterized by using a mixture of the same and a method for producing the granule. In the present invention, when the adhesive is only a water-soluble adhesive, the agricultural chemical active ingredient is released from the granules into the water in a short time, resulting in a locally high concentration of the active ingredient, which causes damage to crops. Chemical damage is more likely to occur, and on the other hand, active ingredients tend to adhere to workers during use, creating safety problems. Therefore, the present inventors have discovered that the release of active ingredients from granules into water or soil can be arbitrarily controlled by using an adhesive in which a water-soluble adhesive is further mixed with a water-insoluble adhesive in a specific proportion. They discovered this and completed the present invention.

In addition, the agrochemical granules of the present invention are characterized by extremely high abrasion resistance, and are highly safe granules with very little peeling of the agrochemical active ingredient from the granules even during transportation and impact. It turned out to be a drug. The method for producing the agrochemical granules of the present invention is as follows. A mixed solution of a water-soluble adhesive and a water-insoluble adhesive is added to a non-oil-absorbing granular carrier while stirring to uniformly coat the carrier with the adhesive, and then an absorbent fine powder or an absorbent powder containing an agricultural chemical active ingredient is added to the carrier. This is a method for producing coated agricultural chemical granules, which is characterized in that the agricultural chemical active ingredient itself is added while stirring and coated on a non-oil-absorbing granular carrier.

[0008] In the method for producing agricultural chemical granules of the present invention,
The agrochemical active ingredient can be produced in either a solid or liquid form at room temperature, and can contain two or more types of agrochemical active ingredients. When producing the agricultural chemical granules containing two or more types of agricultural chemical active ingredients, the two or more types of agricultural chemical active ingredients may be mixed in advance, and the first agricultural chemical active ingredient may be added to a non-oil-absorbing granular carrier. After coating, a second or subsequent agricultural chemical active ingredient may be further coated.

[0009] In the present invention, agrochemically active ingredients are meant to mean all active compounds which can be customarily used in plant protection. These preferably include insecticides, nematicides, acaricides, fungicides, herbicides, and growth regulators, and may also include mixtures of two or more of these. Specific examples include the following. Insecticidal active ingredients include (1) 1,3
-Bis(carbamoylthio)-2- (N, N-dimethylamino)propane hydrochloride (generic name: Cartap) (2) 2-isopropoxyphenyl-N-methylcarbamate (generic name: PHC) (3) O, S-dimethyl-N-acetylphosphoroamidothioate (generic name: acephate) (4) 2-(4-ethoxyphenyl)-2-methylpropyl 3-phenoxybenzyl ether (generic name: etofenprox) ( 5) 2,3-dihydro-2,2-dimethyl-7-benzo[b]furanyl N-dibutylaminothio-N-methylcarbamate (generic name: carbosulfan) As the bactericidal active ingredient, (1) 5-methyl-1,2,4-triazolo[3,4
-b] Benzothiazole (generic name: tricyclazole) (2) 3-allyloxy-1,2-benziisothiazole-1,1-dioxide (generic name: probenazole) (3) Diisopropyl = 1,3-dithiolane-2
-ylidene-malonate (generic name: isoprothiolane) (4) 1,2,5,6-tetrahydropyrrolo[3
,2,1-ij] Quinolin-4-one (Generic name: Pyroquilone) (5) 6-(3,5-dichloro-4-methylphenyl)-3(2H)-pyridazinone (Generic name: Diclomedine) (6 ) α,α,α-Trifluoro-3'-isopropoxy-O-toluanilide (generic name: flutolanil) (7) 1-(4-chlorobenzyl)-1-cyclopentyl-3-phenylurea (generic name: pencyclone) ) Herbicidal active ingredients include (1) Ethyl 5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazole-4-carboxylate (generic name: pyrazosulfuronethyl) ( 2) Methyl = α-(4,6-
Dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-O-toluate (generic name: bensulfuron methyl), and the like.

Specific examples of the absorbent fine powder include white carbon, diatomaceous earth, synthetic calcium silicate, and talc, with synthetic calcium silicate being preferred. Specific examples of the non-oil absorbing granular carrier include calcium carbonate, silica sand, and glass beads, with silica sand being preferred.

[0011] The particle size of this non-oil-absorbing granular carrier is not particularly limited, but is approximately 0.1 to 1.0 m.
m is desirable. Specific examples of water-soluble adhesives include (1) starch-based natural products such as soluble starch, carboxymethyl starch, and dextrin; (2) natural substances such as sodium alginate, gum arabic, gelatin, and casein; and (3) methyl cellulose. cellulose derivative (4
) Polyvinyl alcohol (5) Polyvinyl methyl ether (6) Polyvinylpyrrolidone (7) Vinylpyrrolidone-vinyl acetate copolymer (8)
Polyacrylamide (9) Polymers of acrylic acid, methacrylic acid, esters or salts thereof, or copolymers thereof (10
) polyethylene glycol (11) polyethylene oxide, etc., but polyvinylpyrrolidone and the like are preferred.

[0012] As the water-insoluble adhesive, it is desirable to use an emulsion adhesive that can be dispersed in a water-soluble adhesive.
Specifically, for example, (1) an emulsion of a polymer such as acrylic acid ester, vinyl chloride, vinyl acetate, and styrene or a copolymer thereof (2) an emulsion of a copolymer of ethylene and vinyl acetate (3) acetic acid Examples include emulsions of copolymers of vinyl and acrylic esters.

[0013] The mixing ratio of the water-soluble adhesive and the water-insoluble adhesive is 100 parts by weight of the former and 1 part by weight of the latter.
A range of 80 parts by weight is preferred. In the agrochemical granules of the present invention, stabilizers, dispersants, and colorants as main ingredients can be used as necessary. Examples of the stabilizer include epoxidized soybean oil, epoxidized linseed oil, epoxidized cottonseed oil, epoxy fatty acid ester, ethylene glycol glycidyl ether, alkyl phosphoric acid derivatives, diethylene glycol, etc., and examples of the dispersant include lignin sulfonate. , naphthalene sulfonate formalin condensate,
Examples include polyanions, alkylbenzene phosphates, alkylbenzene sulfonates, water-soluble inorganic salts, etc. Colorants include, for example, Food Yellow No. 4 (Tartrazine), Food Red No. 3 (Elsulosin), Food Blue No. 1 (
Brilliant Blue FCF), Food Blue No. 2 (Indigo Carmine), etc., and two or more of these may be mixed.

[0014]

[Examples] Next, the manufacturing method and various tests for the agricultural chemical granules of the present invention will be explained with specific examples, but the present invention is not limited only to these examples. . In addition, the following parts mean parts by weight. Example 1 (Production method of agricultural chemical granules of the present invention) 3-allyloxy-1,2-benziisothiazole-1,1-
Dioxide (generic name: probenazole) 3.6 parts,
0.2 parts of sodium ligninsulfonate and 3 parts of synthetic calcium silicate (absorbent fine powder) were mixed and stirred using a mixer to uniformly disperse each of them. Mixture A
It is called.

Next, an adhesive solution prepared by dispersing 0.35 parts of polyvinylpyrrolidone (water-soluble adhesive) and 0.15 parts of polyvinyl acetate (water-insoluble adhesive) in an appropriate amount of water was mixed with silica sand (non-oil-absorbing granular carrier). ) to 92.5 parts of the mixture with stirring to uniformly coat the mixture. Next, the above mixture A was added to the silica sand uniformly coated with the adhesive solution while stirring, and after uniformly coating, 0.2 part of Food Blue No. 1 was added with stirring, and dried. Granules for agricultural chemicals were obtained. Comparative Example 1 In Example 1, 0.50 parts of polyvinylpyrrolidone (water-soluble adhesive) was used instead of 0.35 parts of polyvinylpyrrolidone (water-soluble adhesive) and 0.15 parts of polyvinyl acetate (water-insoluble adhesive). Granules of Comparative Example 1 were obtained by operating in exactly the same manner as in Example 1, except that . Comparative Example 2 In Example 1, 0.50 parts of polyvinyl acetate (water-insoluble adhesive) was used instead of 0.35 parts of polyvinylpyrrolidone (water-soluble adhesive) and 0.15 parts of polyvinyl acetate (water-insoluble adhesive). Granules of Comparative Example 2 were obtained in the same manner as in Example 1 except that 100% of the granules were used. Example 2 [Temporal water release test of formulations (granules of Examples and Comparative Examples)] 100 ml of distilled water was placed in a 100 ml flask, and 1 g of each of the above test granules was added. The exam is 15
The test was carried out in a constant temperature water bath at ±05°C. 10 minutes after addition, 1
After 48 hours, each granule was placed on a 105 μm sieve to separate the active ingredient that had migrated into the water from the granule. The amount of active ingredient in the remaining granules was determined using high performance liquid chromatography.
The amount of active ingredient transferred into water (release rate) was determined using the following formula.

[0016] Release rate (%) = (1-X/Y) x 100
X: Amount of active ingredient remaining in the granule Y: Amount of active ingredient in the granule before the test The results are shown in Table 1. This test is intended to confirm the short-term migration into water or soil in the presence of water and the gradual migration of the active ingredient over a long period of time.

From the results shown in Table 1 above, in the granules of the present invention, the active ingredient is controlled to be released into water relatively slowly. On the other hand, in the case of the granules of Comparative Example 1, the active ingredient is released into water in a short period of time, which may cause chemical damage and safety during use. Furthermore, the granules of Comparative Example 2 are considered to be less effective because almost no active ingredient is released. Example 3 (Test on the stability over time of the granules of Example 1) 500 g of the test granules were placed in an aluminum foil bag and subjected to an abuse test for 3 months in a thermostat at 40°C. After this test,
The active ingredients were quantified and changes over time were investigated. As a result, there was almost no difference in the amount of active ingredient in the granules of Example 1 before and after the test.

From these results, the granules of the present invention are excellent because the active ingredients in the granules are stable over a long period of time. Example 4 (Production method of agricultural chemical granules of the present invention) 2, 3
-dihydro-2,2-dimethyl-7-benzo[b]
3.7 parts of furanyl-N-dibutylaminothio-N-methylcarbamate (generic name: carbosulfan), 0.2 parts of epoxidized soybean oil, 0.3 parts of diethylene glycol, 0.3 parts of sodium ligninsulfonate, and synthesis 5 parts of calcium silicate (absorbable fine powder) and 5-methyl-1
, 4.5 parts of 2,4-triazolo[3,4-b]benzothiazole (generic name: tricyclazole) were mixed and stirred using a mixer to uniformly disperse them. This mixture is called mixture B.

Next, an adhesive solution prepared by dispersing 0.3 parts of polyvinylpyrrolidone (water-soluble adhesive) and 0.2 parts of polyvinyl acetate (water-insoluble adhesive) in an appropriate amount of water was mixed with silica sand (
The mixture was added to 85.3 parts of a non-oil-absorbing granular carrier with stirring to uniformly coat the mixture. Next, the above-mentioned mixture B was added to the silica sand uniformly coated with the adhesive liquid while stirring, and the following operation was carried out in exactly the same manner as in Example 1 to obtain agricultural chemical granules of the present invention. Example 5 (Production method of agricultural chemical granules of the present invention) 2, 3
-dihydro-2,2-dimethyl-7-benzo[b]
Furanyl-N-dibutylaminothio-N-methylcarbamate (generic name: carbosulfan) 3.7 parts, 3-
Allyloxy-1,2-benziisothiazole-1,1
-dioxide (generic name: probenazole) 3.5
1 part, 0.2 parts of epoxidized soybean oil, 0.2 parts of diethylene glycol, 0.2 parts of sodium ligninsulfonate, and 3 parts of synthetic calcium silicate (absorbent fine powder) were mixed and stirred in a mixer to uniformly disperse each. I let it happen. This mixture is called mixture C.

Next, an adhesive solution prepared by dispersing 0.35 parts of polyvinylpyrrolidone (water-soluble adhesive) and 0.15 parts of polyvinyl acetate (water-insoluble adhesive) in an appropriate amount of water was mixed with silica sand (non-oil-absorbing granular carrier). ) to 88.5 parts of the mixture with stirring to uniformly coat the mixture. Next, the above-mentioned mixture C was added to the silica sand uniformly coated with the adhesive liquid while stirring, and the following operation was carried out in exactly the same manner as in Example 1 to obtain agricultural chemical granules of the present invention.

Claims (5)

[Claims] Claim 1: When coating an absorbent fine powder containing one or more agricultural chemical active ingredients or one or more agricultural chemical active ingredients themselves on a non-oil-absorbing granular carrier, a water-soluble adhesive is used as the adhesive. A coated agricultural chemical granule characterized by using a mixture of a water-soluble adhesive and a water-insoluble adhesive. 2. The coated agricultural chemical granule according to claim 1, wherein the water-soluble adhesive is polyvinylpyrrolidone. 3. The coated agricultural chemical granule according to claim 1, wherein the water-insoluble adhesive is polyvinyl acetate. 4. The coated agricultural chemical granule according to claim 1, wherein the weight ratio of the water-soluble adhesive to the water-insoluble adhesive is 100 parts of the former and 1 to 80 parts of the latter. 5. A mixture of a water-soluble adhesive and a water-insoluble adhesive is added to a non-oil-absorbing granular carrier while stirring to uniformly coat the carrier with the adhesive, and then the agrochemically active ingredient is added to the carrier. A method for producing a coated agricultural chemical granule, which comprises adding absorbent fine powder or the agricultural chemical active ingredient itself while stirring and coating the non-oil absorbing granular carrier.