JP2792005B2 - Disintegration aid for pesticide granules and pesticide granules containing the disintegration aid - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pesticide granule disintegration aid and a pesticide granule containing the disintegration aid.

Biocides such as insecticides, bactericides, herbicides, etc. are formulated into emulsions, wettable powders, granules, powders, and other suitable formulations depending on their physical properties and intended use, and are put to practical use. . Among the above formulation types, granules are particularly widely used as biocides for soil treatment, water surface treatment and the like, because of their advantages such as labor saving of control and safety. Such granules are usually produced by mixing an inorganic carrier such as clay, kieselguhr, bentonite and a biocide active substance and granulating the mixture, or by adsorbing or coating the biocide active form on previously granulated vacant beads. However, when these granules are applied to water, it is necessary to rapidly swell and disintegrate, and elute the biocide active substance contained therein.

TECHNICAL FIELD The present invention relates to an auxiliary agent for improving the disintegration in water of a pesticide granule and to an agricultural granule excellent in disintegration in water by containing the auxiliary.

<Conventional technology and its problems> Conventionally, as an auxiliary agent for improving the disintegration in water of pesticide granules,
Water-soluble polymer compounds (JP-B 48-1501, JP-A 58-1319)
04, JP-A-61-167602) or an anionic surfactant such as an alkyl benzene sulfonate (Japanese Patent Publication No. 57-167602).
44643) and alkyl sulfates (JP-A-59-19380)
3) Further, a non-ionic surfactant, for example, a half ester of a polyhydric alcohol and a dicarboxylic acid (JP-A-57-15)
4101) and polyethylene glycol alkylphenyl ether (JP-A-57-154101).

However, when a conventionally proposed water-soluble polymer compound such as a polycarboxylate, a polyvinyl aromatic sulfonate, and a lignin sulfonate or an anionic surfactant as described above is used as a disintegration aid, an agricultural chemical is used. There is a problem of lack of versatility because the disintegration property is greatly affected by the type of the carrier forming the granule, and the above-described anionic surfactant and nonionic surfactant are disintegrated. When used as an auxiliary, there is a problem that disintegration in water having high hardness cannot be improved.

In fact, regardless of the type of the carrier, there is a demand for the appearance of a disintegrating agent for pesticide granules that exhibits stable disintegration in water, especially excellent disintegration in hard water, and the appearance of such pesticide granules.

<Problems to be Solved by the Invention, Means for Solving the Problems> The present invention provides a new disintegration aid for pesticide granules and a pesticide granule containing the disintegration aid, which solves the above conventional problems. Also.

However, in view of the above situation, the present inventors have widely applied various inorganic carriers, and have excellent hard water disintegration disintegration aids for pesticide granules and such pesticide granules. As a result of diligent research to obtain an agent, a specific polyoxyethylene-polyoxypropylene glycol ether having no hydrophobic atomic group consisting of a hydrocarbon chain in the molecule is suitable and suitable as a disintegration aid used for pesticide granules. The inventors have found that the present invention has been completed.

That is, the present invention provides a polyglycol ether in which an alkylene oxide or an alkylene oxide is added to a linear or hexavalent alcohol having 1 to 6 carbon atoms, wherein ethylene oxide / propylene oxide is 80 or less. Polyoxyethylene having a molecular weight of 1,000 to 10,000 added at a ratio of 4040/20 to 60 (% by weight)
The present invention relates to a disintegration aid for pesticide granules comprising polyoxypropylene glycol ether.

Further, the present invention is a pesticide granule containing the above-mentioned disintegration aid for pesticide granules, a biocide active ingredient and an inorganic carrier as essential components,
The present invention relates to an agricultural chemical granule comprising the disintegration aid for agricultural chemical granules in a ratio of 1 to 3% by weight.

In the present invention, the disintegration aid is a poly (alkane) obtained by adding ethylene oxide and propylene oxide to a chain or cyclic C1-C6 alcohol having 1 to 6 carbon atoms in a random or block manner. Oxyethylene-polyoxypropylene glycol ether. This polyoxyethylene-polyoxypropylene glycol ether has a hydrophobic atomic group composed of a hydrocarbon chain having 8 or more carbon atoms and a polyoxyethylene group and / or a polyoxypropylene group in a molecule. Different from non-ionic surfactants.

In the present invention, the starting material of the polyoxyethylene-polyoxypropylene glycol ether, which is a disintegration aid, is a linear or cyclic C1-C6 alcohol having 1-6 carbon atoms. Such alcohols include the following compounds.

Monohydric alcohols: methanol, ethanol, propanol, isopropanol, n-butanol, isoamyl alcohol, n-hexanol Dihydric alcohols: ethylene glycol, propylene glycol, 1,4 butanediol, neopentyl glycol Trihydric alcohol: Glycerin, diglycerin,
Trimethylolpropane, trimethylolethane, pentaerythritol, anhydrosorbitol, sorbitol In the present invention, ethylene oxide added to the above alcohol to obtain polyoxyethylene-polyoxypropylene glycol ether as a disintegration aid Propylene oxide has a ratio of 80 to 40/2
It is in the range of 0 to 60 (% by weight). Furthermore, in the present invention, the polyoxyethylene-polyoxypropylene glycol ether as a disintegration aid obtained by adding ethylene oxide and propylene oxide to the above-mentioned alcohol has a molecular weight of 1,000 to 10,000. If the ratio of ethylene oxide / propylene oxide to be added or the molecular weight of the resulting polyoxyethylene-polyoxypropylene glycol ether is out of the above range, sufficient disintegration of the pesticide granule cannot be provided.

In the step of preparing the pesticide granule, it is desirable that the composition obtained by adding water to the biocide base material, the inorganic carrier and the disintegration aid and not kneading does not significantly increase the viscosity, and for this purpose, ethylene oxide and propylene oxide are used. It is preferable to make the addition form of a random form.

The pesticide granule according to the present invention contains the disintegration aid, the biocide raw material, and the inorganic carrier as essential components as described above. The content ratio of the disintegration aid according to the present invention in the pesticide granules is 1 to 3% by weight.

The biocide active ingredient used is not particularly limited, such as insecticides, bactericides, herbicides, etc., and any of these can be used in liquid or solid form. it can. Such biocide active ingredients include Diazinon, Saturn, Baigit, Bassa, NAC, NIP, MIPC,
CNP and the like. Also, the inorganic carrier used,
There is no particular limitation on clay, kieselguhr, gentonite, calcium carbonate and the like, and these can be used alone or in combination.

The method for preparing the pesticide granule is not particularly limited, and a known method can be employed. That is, the biocide raw material, the inorganic carrier and the disintegration aid according to the present invention are mixed with water by uniformly adding water, and the kneaded material is extruded into a predetermined shape by a granulator, and then dried. Prepare granules. Alternatively, empty beads containing no biocide are granulated in advance, and then the external empty beads are adsorbed or coated with the biocide to prepare granules. When granulating,
At the time of kneading, a binder such as starch, polyvinyl alcohol, and sodium alginate can be used in combination.

Hereinafter, although an example etc. are given in order to make the structure and effect of the present invention more specific, the present invention is not limited to the example.

<Examples and the like>-Test Category 1 Various disintegration aids were synthesized by the methods exemplified below, and the results are shown in Tables 1 (Examples) and 2 (Comparative Examples) below.

合成 Synthesis of Disintegration Aid a-1 148 g of n-butanol and 6 g of caesari were charged into an autoclave, and the inside of the reaction system was replaced with nitrogen gas. 100-130
1134 g ethylene oxide and propylene oxide 1 at ℃
The mixture with 160 g was introduced under pressure into the autoclave over 3 hours, and further reacted at the same temperature for 2 hours. The reaction product was filtered, and the disintegration aid a-1 (Example) was added to 2438.
g obtained.

The hydroxyl value of the disintegration assistant a-1 was 50.8, and the average molecular weight calculated from the hydroxyl value was 1200. As a result of analysis by proton NMR, the addition ratio of ethylene oxide and propylene oxide in the disintegration aid a-1 was 49.6% by weight and 50.4% by weight, respectively.

Similarly, disintegration assistants a-2 to a-6 (Examples) and r-1 to r-12 (Comparative Examples) were synthesized and analyzed.

In Tables 1 and 2, the addition form is the addition form of ethylene oxide and propylene oxide, and EO% is the ratio (% by weight) of the added ethylene oxide and ethylene oxide in propylene oxide.

・ Test Category 2 75 parts clay, 19 parts bentonite, MI as biocide
4 parts of PC (o-cumenylmethyl carbamate) and 2 parts of disintegration aid (each part by weight) were uniformly mixed, and 17 parts by weight of water was added thereto, followed by further uniform kneading. The kneaded material was extruded by passing through a 0.7 mmφ slurry and finished into a fluid. 50 ° C for granules
For 3 hours to obtain pesticide granules.

The disintegration in water of each pesticide granule was evaluated by the following method, and the results are shown in Table 3 (Example) and FIG. 4 (Comparative Example) described below.

評 価 Evaluation of disintegration in water A 20 cm 19-degree hard water is placed in a Petri dish having a diameter of 8.5 cm and a depth of 2 cm, and one of the above pesticide granules is gently put into the center of the Petri dish. The collapse state was observed and measured. For evaluation of disintegration, the disintegration state was observed five times for each pesticide granule, and the average value was evaluated according to the following criteria.

◎ Completely disintegrates in less than 30 seconds ○: Completely disintegrates in 30 seconds or more and less than 1 minute △: Almost disintegrates in 1 minute or more and less than 2 minutes, but partially retains the original form ×: 3 After the elapse of more than one minute, the prototype remains almost the same. In Table 4, r-13 in the column of the type of the disintegration aid was used.
Is a 60% sodium salt of an isobutylene / maleic acid copolymer having a degree of polymerization of 25 of isobutylene / maleic acid.

Test Category 3 Pesticide granules having the compositions shown in Table 5 (Examples) and Table 6 (Comparative Examples) described below were prepared in the same manner as in Test Category 2. For each pesticide granule, the disintegration in water was evaluated in the same manner as in the case of Test Category 2, and the results were shown in Tables 5 and 6.
It is shown in the table.

In Tables 5 and 6, I in the column of inorganic carrier is clay / bennite = 80/20, II is calcium carbonate / bentonite = 70/30, and III is talc / bentonite = 80/20. Wherein the diazinon is o, o-diethyl-o-2-isopropyl-6-methylpyrimidine-4yl-phosphorothioate, NIP
Is 2,4-dichlorophenyl-4-nitrophenyl ether. Parts in each column are parts by weight.

<Effects of the Invention> As is clear from the results of each table, the present invention described above has an effect of exhibiting stable underwater disintegration, particularly excellent disintegration in hard water, regardless of the type of carrier. There is.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A01N 25/12 A01N 25/30 CA (STN) REGISTRY (STN)

Claims (2)

(57) [Claims] 1. A polyglycol ether in which an alkylene oxide is added to a linear or hexavalent alcohol having 1 to 6 carbon atoms, wherein the alkylene oxide is ethylene oxide / propylene oxide. Is added at a ratio of 80 to 40/20 to 60 (% by weight), and a disintegration aid for pesticide granules consisting of polyoxyethylene-polyoxypropylene glycol ether having a molecular weight of 1,000 to 10,000. 2. A pesticide granule comprising the disintegration aid for pesticide granules according to claim 1, an active ingredient of a biocide and an inorganic carrier as essential components, wherein the disintegration aid for pesticide granules is 1 to 3% by weight. % Pesticide granules.