JP3361111B2 - Foaming pesticide formulation for water application - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effervescent pesticide formulation applied to paddy fields. [0002] Conventionally, studies on effervescent pesticide preparations have been carried out using solid acids, carbonates of alkali metals or alkaline earth metals,
There have been many studies on herbicidal granules and tablets comprising a mineral carrier and a surfactant (Japanese Patent Publication No. 47-27930). Recently, as one of the labor-saving methods of spraying pesticides, we put herbicide granules in water-soluble polymer bags or put a foaming agent into large tablets to make them into large tablets. A method of throwing it in has been proposed. [0003] In the conventional effervescent pesticide preparations described above, since a solid acid and a carbonate coexist in the preparation,
There is a problem that storage stability is poor because the bag containing the pesticide expands by reacting with a trace amount of water in the formulation to generate carbon dioxide gas and expand the bag containing the pesticide. In addition, when applied to paddy fields, there are drawbacks such as insufficient diffusibility of the pesticidal active ingredient in water, resulting in insufficient control effect, and the method has not been put to practical use. Therefore, development of a new effervescent pesticide instead of this is desired. Accordingly, an object of the present invention is to provide a novel water-applied effervescent pesticide formulation having good storage stability and excellent diffusion to paddy fields. Means for Solving the Problems The present inventors have made intensive studies to solve these problems. As a result, by separately molding the carbonate and the water-soluble solid acid and packaging them together with a water-soluble polymer film, there is no generation of carbon dioxide even in the presence of some water, so the storage stability is remarkable. In addition, they found that when treated in a paddy field, they foamed in the same manner as a conventional foaming formulation, and were able to effectively diffuse the pesticidal active ingredient into water, thus completing the present invention. Accordingly, the present invention comprises a molded product comprising a carbonate and an inorganic or organic carrier and a molded product comprising a water-soluble solid acid and an inorganic or organic carrier, wherein one or both of the molded products carry an agricultural chemical active ingredient. Let
The present invention relates to a water-applied foamable pesticide formulation obtained by packaging both molded products together with a water-soluble polymer film. Next, the effervescent pesticide preparation of the present invention will be specifically described. The carbonate used in the present invention is not particularly restricted but includes, for example, sodium carbonate, sodium hydrogen carbonate, ammonium carbonate, potassium carbonate, calcium carbonate, sodium sesquicarbonate and the like. These carbonates may be used alone or in combination of two or more. The water-soluble solid acid used in the present invention is not particularly limited. Examples thereof include citric acid, succinic acid, fumaric acid, maleic acid, tartaric acid, oxalic acid, malic acid, adipic acid, and the like.
Examples thereof include boric acid, sodium dihydrogen phosphate, and potassium dihydrogen phosphate. These water-soluble solid acids may be used alone or in combination of two or more. The inorganic or organic carrier is not particularly restricted but includes, for example, clay, silica, talc, bentonite, calcium carbonate, pumice, diatomaceous earth, vermiculite, perlite, white carbon, urea,
Ammonium sulfate, ammonium chloride, potassium chloride,
Examples include sodium sulfate, sodium carbonate, sucrose, glucose, maltose, lactose, dextrin, starch, polyvinyl alcohol, cellulose carboxymethyl cellulose, polyethylene glycol, sodium polyacrylate, gum arabic, xanthan gum, and the like. [0010] Any of the pesticidal active ingredients of the present invention can be used as long as it is commonly used in paddy fields. For example, the following are mentioned. (Insecticide) MPP, MEP, pirimiphosmethyl, diazinon, isoxathion, pyridafenthion, chlorpyrifosmethyl, bamidione, marathon, PAP, dimethoate, ethylthiomethone, PM
P, monocrotophos, BRP, CVMP, dimethylvinphos, propaphos, DEP, EPN, NAC, MTM
C, MIPC, BPMC, PHC, MPMC, XMC,
Bendiocarb, carbosulfan, benfracarb, thiodicarb, cycloprothrin, etofenprox, cartap, thiocyclam, bensultap,
Buprofezin, etc. (Disinfectant) basic copper sulfate, basic copper chloride,
Cupric hydroxide, organosulfur nickel salt, thiuram, captan, TPN, fusalide, IBP, EDDP, thiophanate methyl, benomyl, iprodione, mepronil, flutranil, tefurophthalam, pencyclon, metalaxyl, triflumizole, blasticidin S,
Kasugamycin, polyoxin, validamycin A, oxytetracycline, hydroxyisoxazole, metasulfocarb, MAF, MAFE, benthiazole,
Phenazine oxide, diclomedine, probenazole,
Isoprothiolane, tricyclazole, pyroquilon, oxonic acid, guazatine, and the like. (Herbicides) 2,4-D, MCP, MCP
B, Phenothiol, Clomeprop, Naproanilide, CNP, Clomethoxynil, Bifenox, MC
C, Benthiocarb, Esprocarb, Molinate, Dimepiperate, DCPA, Butachlor, Pretilachlor, Bromobutide, Mefenacet, Dimelone, Bensulfuron-methyl, Simethrin, Promethrin, Dimethamethrin, Bentazone, Oxadiazon, Pyrazolate, Pyrazoxifen, Benzofenap, Triflularin, CN Such. (Plant regulator) Inabenfide, oxyethylene docosanol, nicotinamide, benzylaminopurine, and the like. The amount of these pesticidal active ingredients to be added to the preparation is not particularly limited, but is generally 0.1 to 50% (% by weight) of the total amount of the preparation, and May be added so that the required spray amount per 10 ares is obtained. These pesticidal active ingredient names are common names described in "Agrochemical Handbook" (1989 edition, published by the Japan Plant Protection Association). In addition to the above, auxiliary agents such as surfactants, high-boiling solvents, stabilizers for pesticide active ingredients, and physical property improvers may be added to the effervescent pesticide formulation for water application according to the present invention. As such surfactants, nonionic surfactants, anionic surfactants, cationic surfactants and nonionic and anionic mixtures commonly used in agricultural chemical formulations are used. Surfactants and the like can be used. The method for preparing the water-applied effervescent pesticide preparation of the present invention is not particularly limited, but is prepared, for example, by the following method. The pesticide active ingredient is or may not be added to the carbonate and the inorganic or organic carrier and granulated by a dry granulator. On the other hand, the granulation is carried out by a dry granulator with or without the pesticidal active ingredient in the water-soluble solid acid and the inorganic or organic carrier. However, the pesticidal active ingredient is contained in one or both of a molded product containing a carbonate and a molded product containing a water-soluble solid acid. After being formulated in this way, it is packaged with a water-soluble polymer film. The shape of the molded product is not particularly limited. For example, any of fine particles, granules, tablets and the like may be used. The effervescent pesticide preparation for water application according to the present invention comprises a molded article containing a carbonate and a molded article containing a water-soluble solid acid, which are packaged together with a water-soluble polymer film. Is not particularly limited, but 1: 2
A range of ２2: 1 is desirable. The total weight of the carbonate and the water-soluble solid acid when blended is 10 to 90 with respect to the total weight.
%, The weight ratio of carbonate to water-soluble solid acid is 1:10 to 1
0: 1 is desirable. Furthermore, the weight of the packaged product is that the formulation of the present invention is put into a paddy field, and is packaged in a water-soluble polymer film at a rate of 10 to 100 g per piece from the viewpoint of ease of dosing and labor saving. Is desirable.
The shape of the packaging is not particularly limited. For example, spherical, angular,
Any of a columnar shape, a box shape, and an irregular shape may be used. As the water-soluble polymer film used in the present invention, any one can be used as long as it can be rapidly dissolved in water. Examples include polyvinyl alcohol, carboxymethylcellulose, dextrin, hydroxyethylcellulose, methylcellulose, alginate, gelatin, pectin, pullulan, polyvinylpyrrolidone, polyacrylate, polyethylene oxide, and the like. Also, the thickness of these films during storage,
Any material that does not easily break during transportation or when thrown by hand into a paddy field may be used, and may be 30 μm to 2 mm. The water-applied effervescent pesticide preparation of the present invention thus obtained varies depending on the kind of the pesticidal active ingredient, the content in the preparation, etc., for example, 50 g to 100 g per 10 ares.
If it is wrapped in a weight of about 5 to 20 pieces, it may be thrown into a paddy field. If it does so, carbon dioxide will be released in water and it will foam, and an agricultural chemical active ingredient will diffuse widely in water, and a sufficient control effect can be brought about. [Action] In the present invention, a carbonate and a water-soluble solid acid react with a large amount of water in a paddy field to release a large amount of carbon dioxide gas, thereby having an effect of diffusing an agricultural chemical active ingredient into the paddy water. In addition, the inorganic or organic carrier functions as a carrier for supporting the pesticidal active ingredient, and the carbonate and the water-soluble solid acid also function as carriers. [Examples] Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the following, "parts" all mean parts by weight. Example 1 (A) After mixing 4.2 parts of a phenothiol bulk material, 60 parts of citric acid and 35.8 parts of lactose with a hammer mill,
Dry granulation with briquetting machine, after granulation, 50
Granules of 0 to 1,680 μm were obtained. (B) 90 parts of the simethrin raw material, 60 parts of sodium hydrogencarbonate and 31 parts of lactose are mixed by a hammer mill, and dry-granulated by a briquetting machine.
After sizing, granules of 500 to 1,680 μm were obtained. Further, 25 g of the granules prepared in (A) and 25 g of the granules prepared in (B) were packaged with polyvinyl alcohol (50 μm in thickness) to obtain 50 g of the agricultural chemical preparation of the present invention. Next, the usefulness of the effervescent pesticide formulation for water application according to the present invention is shown by test examples. Test Example 1 Storage stability 50 g of a sample prepared according to Example 1 (not packaged with a water-soluble polymer film) was heat-sealed in an aluminum bag, and then allowed to stand in a thermostat at 40 ° C. did. Stationary 9
It was taken out after 0 day, the volume was measured, and the expansion rate (%) with respect to the initial volume was calculated by the following equation. ## EQU1 ## As a comparative preparation, granules were prepared by the following method and tested. After mixing 2.1 parts of phenothiol drug substance, 4.5 parts of simethrin drug substance, 30 parts of water-soluble solid acid, 30 parts of carbonate and 33.4 parts of lactose with a hammer mill, dry mixing with a briquetting machine. After granulation and sizing, 500 ~
1,680 μm granules were obtained. The results are shown in Table 1. [Table 1] Test Example 2 Herbicidal effect and phytotoxicity test A test plot having an area of 100 m ² (10 mx 10 m) was prepared, and per plot, the seeds of the seeds of the Japanese millet (50 g), the firefly seeds (30 g), the azena seed (10 g), The seeds of konagi (10 g) were sowed, and after shaking, paddy rice seedlings (variety: Nipponbare) at the 2 leaf stage were mechanically transplanted. When these weeds reached the 2-3 leaf stage, one (50 g) sample prepared according to Example 1 was treated in the center (one place) of the test plot. The commercial granules used as the comparative agent were sprayed on the entire surface of the paddy field. The investigation was conducted 30 days after the treatment with the chemicals. Weeds that had survived in a total of 5 m ² were extracted from the central and four corners of the test plot in a total of 5 m ² , the dry weight (g) thereof was measured, and the dry weight (g) was measured by the following formula. The average weeding rate (%) was determined. With respect to the phytotoxicity of paddy rice, the degree of phytotoxicity was surveyed according to the following criteria. The results are shown in Tables 2 and 3. ## EQU2 ## Degree of phytotoxicity 0: No phytotoxicity 1: Slight 2: Slight 3: Medium 4: Large 5: Maximum (dead) [Table 3] * 2.1 parts of phenothiol drug substance, 4.5 of simethrin drug substance
Parts, 10 parts of citric acid, 20 parts of sodium bicarbonate, 5 parts of Airol CT-1, 30 parts of bentonite and 28.4 parts of clay are mixed by a hammer mill, dry-granulated with a briquetting machine, and sized. 500 to 1,680
μm granules were obtained. Next, 50 g of the granules were packaged with a polyvinyl alcohol film. According to the present invention, the following effects can be obtained. First, the effervescent pesticide formulation for water application according to the present invention does not generate carbon dioxide even when a small amount of water is present during storage, and has excellent storage stability. Second, since the water-applied effervescent pesticide formulation of the present invention is packaged with a water-soluble polymer film, and only about 5 to 20 pieces per 10 are required to be manually input, it is labor-saving and sprayable. It is economical because no machine is required. Third, when put into a paddy field, carbon dioxide gas is released and foamed, whereby the pesticide active ingredient can be quickly and uniformly diffused into the paddy field, and the effect of the pesticide active ingredient can be sufficiently exerted.

Continuation of the front page (56) References JP-A-54-44013 (JP, A) JP-A-61-207322 (JP, A) JP-A-53-99327 (JP, A) JP-A-60-61504 (JP, A) JP-A-55-66507 (JP, A) JP-A-61-183219 (JP, A) JP-A-2-110 (JP, A) JP-A-60-142901 (JP, A) JP-A-60-142901 JP-A-64-24900 (JP, A) JP-A-61-141609 (JP, A) JP-A-4-273802 (JP, A) JP-A-3-227916 (JP, A) A) JP-A-63-8497 (JP, A) JP-A-3-119174 (JP, A) JP-B 38-9740 (JP, B1) JP-B 40-24792 (JP, B1) Patent 61786 (JP) , C2) U.S. Pat. No. 3,773,922 (US, A) French Patent Application Publication No. 2044216 (FR, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01N 25/08-25/16 A01N 25 / 34 A01N 43/70 A01N 37/40 C09K 3/00 C11D 3/10 C11D 3/20 A61K 9/46 JICST file (JOIS)

Claims (1)

(57) [Claims] 1. A molded article comprising a carbonate and an inorganic or organic carrier, and a molded article comprising a water-soluble solid acid and an inorganic or organic carrier, and one or both of them are molded A water-applied foamable pesticidal preparation characterized in that a pesticidal active ingredient is supported on a water-soluble polymer film and both molded products are packaged together with a water-soluble polymer film.