JPH0639363B2 - Spreading agent for pesticide granules - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spreader for pesticide granules, and more specifically, it shows remarkably excellent spreadability in water of pesticide granules containing calcium carbonate as an extender. An improved spreader for pesticide granules.

[Conventional technology]

Agricultural chemical substances such as pesticides, fungicides, herbicides, etc. are used in order to exert the drug effect sufficiently and to make the application easy and rational use of emulsion, water solvent, powder, wettable powder, granule, etc. It is put into practical use by formulating it into a dosage form suitable for the purpose.

Among these dosage forms, granular pesticide granules play an important role in labor saving of pests and weed control systems and can be applied safely, conveniently and with little loss, so as a pesticide for soil and water treatment, weed control It is a rational dosage form that has been widely applied to drugs, insecticides and nematicides.

Ordinary granules do not disintegrate under the applied pressure or impact during product inventory and transportation, maintain their granular shape, and when applied to the field, they easily disintegrate and spread by contacting water. It is necessary to quickly elute the active pesticide ingredient.

Therefore, conventional general granular pesticides include various pesticide raw materials as active ingredients, inorganic mineral powders such as bentonite, talc, clay and kaolin as carriers, and starch, polyvinyl alcohol, gelatin, CM as binders.
Granules are prepared by adding C, sodium alginate and the like.

Since the granules obtained by these methods are inferior in the spreadability in water as they are, a method of using a carboxylic acid polymer as a spreader (Japanese Patent Publication No. 48-1501) has been proposed.

[Problems to be solved by the invention]

However, in recent years, calcium carbonate has come to be used as an inorganic carrier in order to prevent solidification during long-term storage, prevent screen abrasion during granulation, and prevent decomposition of the raw material used in granulated particles. It became a situation in which satisfactory disintegration / spreadability could not be obtained with the spread agent. That is, a polycarboxylic acid type homopolymer disclosed previously, or a copolymer of styrene, vinyl acetate, etc. and acrylic acid, methacrylic acid, maleic anhydride alone is sufficient for pesticide granules containing calcium carbonate as an essential component. It is not possible to impart the excellent spreadability.

[Means for solving problems]

Therefore, as a result of intensive studies conducted by the present inventors to obtain a spreader that gives excellent disintegration / spreadability to agricultural chemical granules containing calcium carbonate as an essential extender, it has been known as a spreader until now. By using a specific carboxylic acid polymer that did not exist, by further using a specific surfactant in a specific ratio,
The inventors have found that the pesticide granules containing calcium carbonate as an essential extender can significantly improve the spreadability in water, and completed the present invention.

That is, the present invention includes (a) a water-soluble salt of a copolymer of isobutylene or diisobutylene and maleic acid or maleic anhydride, and (b) a sulfate-based, sulfonate- or phosphate-based anionic surfactant, Disclosed is a spreader for pesticide granules, characterized by containing a / b in a weight ratio of 9/1 to 3/7.

The water-soluble salt of the copolymer of isobutylene or diisobutylene used in the present invention and maleic acid or maleic anhydride is produced by a known method. For example, it can be obtained by copolymerizing diisobutylene and maleic anhydride in an organic solvent, followed by hydrolysis with an aqueous alkali solution.

The copolymerization ratio of isobutylene or diisobutylene and maleic acid or maleic anhydride is 2/8 to 8/2, preferably about 1/1.

Isobutylene and diisobutylene may be a mixture.
Maleic acid and maleic anhydride may also be a mixture.

In addition to the above components, a third monomer may be added and copolymerized within a range not impairing the effects of the present invention, but the proportion of the third monomer should be 50 mol% or less, preferably 20 mol% or less. is there.

Examples of the water-soluble salts include alkali metal salts such as sodium and potassium, alkaline earth metal salts such as magnesium, and ammonium salts such as ammonia, triethanolamine and diethanolamine. Also, a mixture of these may be used.

As the (b) sulfate-based, sulfonate- or phosphate-based anionic surfactant used in the present invention,
In the sulfate system, alkyl (8 to 20 carbon atoms) sulfate, polyoxyalkylene alkyl (8 to 2 carbon atoms)
0) ether sulfate, polyoxyalkylene alkyl (carbon number 4 to 16) aryl ether sulfate, polyoxyalkylene styrenated phenol ether sulfate, polyoxyalkylene phenylphenol ether sulfate, polyoxyalkylene tribenzylated phenol ether sulfate, and the like, sulfonate-based Alkyl (C4-16) benzene sulfonate, dialkyl sulfosuccinate, formalin condensate of naphthalene sulfonate, alkylnaphthalene sulfonate or its formalin condensate, formalin condensate of creosote oil sulfonate, alkyl (number of carbon 4-
16) Diphenyl ether sulfonate, α-olefin (C 8-20) sulfonate, etc., and alkyl (C 8-20) phosphate as a phosphate system,
Examples thereof include polyoxyalkylene alkyl (C8 to C20) ethosphosphate and polyoxyalkylene alkyl (C4 to C16) phenyl ether phosphate. You may use together 2 or more types of these anionic surfactants.

The weight ratio of the components (a) and (b) is (a) / (b) = 9/1 to
It is 3/7, preferably 8/2 to 6/4. Outside this range, the remarkable effect of the present invention cannot be obtained.

The spreader of the present invention is incorporated in an amount of 0.1 to 10% by weight, preferably 0.5 to 5% by weight, based on the pesticide granules.

There is no particular limitation on the biocide raw material of the granules in which the spreader of the present invention is used, and it is possible to adsorb to a white carbon or the like even if it is a liquid biocide as well as a paste-like solid biocide at room temperature. Can be used. It may also be a mixture of two or more biocides.

The spreader for pesticide granules of the present invention is for granules containing calcium carbonate as an essential component as an extender, but other inorganic carriers such as clay and diatomaceous earth may be blended. The spreading agent of the present invention is remarkably effective for granules containing 30% by weight or more, preferably 50% by weight or more of calcium carbonate.

The component ratio of the pesticide granules using the spreader for pesticide granules of the present invention is usually as follows.

Agrochemical raw material 1 to 30% by weight (a) Copolymer salt 0.1 to 10 〃 (b) Activator 0.1 to 10 〃 Calcium carbonate 50 to 98.8 〃 Others (inorganic carrier, etc.) 0 to 48.8 〃 About granulation method Is not particularly limited, and can be granulated by a general extrusion granulator.

[Action / effect]

The spreader for agricultural chemical granules of the present invention has the above-mentioned constitution, that is, due to the additive effect of the specific copolymer and the specific anionic surfactant, in particular, the dispersion of calcium carbonate derived from the structure of the copolymer. It is considered that the excellent effect of the present invention is exhibited by the combination of the properties, the wettability and dispersibility of the anionic surfactant, but the details are not clear.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to examples, granulation examples and test examples.

Example 1 Soda salt of copolymer of isobutylene and maleic anhydride 2% (wt) Sodium lauryl sulfate 1 〃 Calcium carbonate 87 〃 CNP drug substance 10 〃 CNP: p-nitrophenyl-2,4,6-trichlorophenyl ether Comparative example 1 Soda salt of a copolymer of isobutylene and maleic anhydride 2% (wt) Calcium carbonate 88 〃 CNP raw material 10 〃 Comparative example 2 Sodium lauryl sulfate 1% (wt) Calcium carbonate 89 〃 CNP raw material 10 〃 Example 2 Isobutylene and Sodium salt of 1% (wt) maleic anhydride copolymer Dier of lauryl phosphate 1 〃 Tanol amine salt Calcium carbonate 93 〃 MIPC substance 5 〃 MIPC: o-cumenylmethylcarbamate Comparative example 3 Isobutylene and maleic anhydride 1 % (Wt) soda salt of copolymer Calcium carbonate 94 〃 MIPC raw material 5 〃 Comparative Example 4 2% (wt) soda salt of acrylic acid homopolymer Polyoxyethylene (EO = 3) 1 〃 Nonylphenol ether Sulfuric acid soda salt Calcium carbonate 92 〃 MIPC raw material 5 〃 Comparative example 5 4% (wt) soda salt of acrylic acid homopolymer Calcium carbonate 91 〃 MIPC raw material 5 〃 Comparative Example 6 Sodium Styrene Sulfonate and 2% (wt) Maleic Anhydride Copolymer Lauryl Phosphate Mono 2 〃 Monoethanolamine Salt Calcium Carbonate 91 〃 MIPC Constituent 5 〃 Example 3 Diisobutylene and Maleic Anhydride 2% Sodium salt of copolymer of (wt) 1% of alkylnaphthalene sulfonic acid (wt) Soda salt Calcium carbonate 87〃 NAC drug substance 10〃 NAC: 1-naphthyl-N-methyl-carbamate Example 4 Diisobutylene and maleic anhydride 2 % (Wt) potassium salt of copolymer Naphthalenesulfonic acid Ammonium 2〃 salt of formalin condensate Calcium carbonate 56〃 clay 30〃 NAC drug substance 10〃 Comparative example 7 Soda salt of copolymer of diisobutylene and maleic anhydride 4% (wt) Calcium carbonate 86〃 NAC drug substance 10〃 Comparative example 8 Diisobutylene and maleic anhydride 4% (wt) Copolymer potassium salt Calcium carbonate 56 〃 Clay 30% (wt) NAC raw material 10 〃 Granulation example Among the components shown in the above Examples 1 to 4 and Comparative Examples 1 to 8, the liquid raw material is white carbon in advance. It was adsorbed at a weight ratio. The solid raw material used was one that had been roughly crushed in advance.

The above-mentioned base material, the spreader of the present invention, and inorganic substances such as calcium carbonate were uniformly mixed, and water was added to finish the granules by an extrusion-type granulator to obtain granules.

Test Example 1 A petri dish having a diameter of 15 cm and a depth of 2 cm was treated with water (3 degree hard water) 1
The granules were placed at a depth of cm, and 1 g of the above granules was gently placed in the center of the Petri dish to determine the spread area over time. The results are shown in Table-1.

Claims (1)

[Claims] 1. A water-soluble salt of a copolymer of (a) isobutylene or diisobutylene and maleic acid or maleic anhydride, and (b) a sulfate-based, sulfonate- or phosphate-based anionic surfactant, A spreader for agricultural chemical granules, characterized in that it is contained in a weight ratio of a / b = 9/1 to 3/7.