JP2003034603A - Method for preventing solidification of sediment in diluted solution of pesticide formulation and method for disinfecting seed using the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent sediment from forming when used when diluted with water, to prevent solidification and to impede the operation and to impair the effect of the pesticide formulation. Provided are a method and a method for disinfecting seeds using the same. SOLUTION: After diluting a pesticide formulation with water, a coagulation inhibitor is added in an amount that does not cause generation of aggregates for at least 15 minutes after the addition, thereby preventing solidification of sediment in the diluent of the pesticide formulation. In this method, a coagulation inhibitor is added to a water diluent of a seed disinfectant, and the water diluent is circulated and brought into contact with the seeds or sprayed on the seeds for disinfection.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method of preventing a pesticide formulation from diluting with water to form a precipitate, which strongly solidifies to hinder the work and impairs the effect of the pesticide formulation. And a method for disinfecting seeds using the method.

[0002]

2. Description of the Related Art Currently, pesticide formulations include granules, powders,
There are emulsions, wettable powders, liquids, flowables, granular wettable powders, jumbo powders, etc. Among these, emulsions, wettable powders, liquids, flowables, granular wettable powders are diluted with water before use. It is a formulation. The formulation to be diluted with water is usually diluted several to several thousand times in the chemical liquid tank of the spraying device, and the pesticide active ingredient and carrier are suspended or emulsified in water. However, these substances, which are water-insoluble and have a higher specific gravity than water, are subject to gradual settling over time.

Since it takes a relatively long time to spray agricultural chemicals, if the agricultural chemical active ingredient or the like settles in the diluting liquid during that time, uneven spraying will occur, so that it is necessary to maintain a uniform diluted state as much as possible. Therefore, in pesticide formulations, it is common practice to reduce the particle size of pesticide active ingredients and the like to slow the sedimentation rate in water or to disperse them into single particles by the action of the surfactant in the formulation.

Further, it is usually practiced to maintain a uniform diluted state by mechanically stirring the inside of the chemical liquid tank of the spraying device. In the piping etc., active ingredients such as pesticides settle and accumulate, causing hard caking, which may cause valve open / close problems in the flow path of the spraying device during spraying, clogging of the spray nozzle, and spraying. It may make cleaning and cleaning difficult after completion, and the effects of pesticide formulations may be impaired. In particular, when spraying with a sprinkler that requires a regulator valve such as a pressurizing valve that has a long flow path from the chemical tank to the spray nozzle after diluting a large amount, or when diluting at a high concentration to disinfect seeds or spray in the air. In many cases, problems due to caking often occur, and improvement thereof is desired, but the effective technique is not known until now.

[0005]

Under these circumstances, the present invention produces a precipitate when an agricultural chemical preparation is diluted with water and used, which solidifies strongly and hinders work. Moreover, the object of the present invention is to provide a method for preventing the effects of the pesticide formulation from being impaired, and a seed disinfection method using the method.

[0006]

[Means for Solving the Problems] As a result of intensive studies on the method for preventing solidification of sediment in a water-diluted solution of an agrochemical formulation, the present inventors have found that after adding a coagulation inhibitor to a water-diluted solution of an agrochemical formulation. Based on this finding, it was found that the solidification of the sediment in the water-diluted solution can be prevented by adding an amount that does not allow the formation of aggregates for at least a certain period of time, and that the object can be achieved. The present invention has been completed.

That is, in the present invention, after the pesticide formulation is diluted with water, the coagulation inhibitor is added at least 1 time after the addition.
A method for preventing solidification of sediment in a diluting solution of an agricultural chemical formulation, which is characterized by adding in an amount that does not allow the formation of aggregates for 5 minutes, and adding a coagulation inhibitor to a water diluting solution of a seed disinfectant, Disclosed is a method for disinfecting seeds, which comprises contacting with the seed while circulating this water-diluted solution or spraying the seed to disinfect the seed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The coagulation inhibitor used in the method for preventing the solidification of a sediment in a pesticide formulation diluent according to the present invention is generally used as a coagulation accelerator in industrial wastewater treatment and the like. Any of an inorganic type and an organic type can be used. Examples of the inorganic coagulation inhibitors include inorganic coagulation accelerators such as aluminum sulfate, polyaluminum chloride and ferric sulfate, and these may be used alone or in combination of two or more kinds. .

On the other hand, the organic coagulation inhibitor is made of a water-soluble polymer compound such as vinyl polyamidine, polymethacrylic acid ester, polyacrylic acid ester, carboxymethyl cellulose, polyvinyl alcohol, alginate, polyvinylpyrrolidone and chitosan. An organic coagulation accelerator is mentioned. Of these, the preferred one is
Carboxymethyl cellulose, polyacrylic acid ester, polyvinyl alcohol, alginate, polyvinylpyrrolidone and chitosan, and polyvinyl alcohol is particularly preferable. The organic coagulation inhibitors may be used alone or in combination of two or more. Further, in the present invention, the inorganic coagulation inhibitor and the organic coagulation inhibitor may be used in combination.

The coagulation inhibitor used in the present invention may be composed of only the above-mentioned aggregation promoter, or may optionally contain a filler, a surfactant, a colorant and the like together with the aggregation promoter. Good. Further, the coagulation inhibitor is powdery,
It may be in any liquid form.

Examples of the powdery coagulation inhibitor include those containing the agglomeration accelerator, a carrier as an extender, and a surfactant and a colorant, if necessary. Examples of the carrier include clays,
Water-insoluble substances such as mineral fine powder such as calcium carbonate, bentonite, talc, diatomaceous earth and white carbon,
Organic or inorganic acid salts such as ammonium sulfate, ammonium hydrogen carbonate, ammonium nitrate, ammonium chloride, potassium chloride, sodium sulfate, magnesium sulfate, sodium citrate, sodium carbonate and sodium hydrogen carbonate, organic acids such as citric acid and succinic acid, sucrose , Sugars such as lactose, water-soluble substances such as urea,
These may be used alone or in combination of two or more. In this powdery coagulation inhibitor, the content of the coagulation accelerator is usually 0.01 to 80% by mass, preferably 0.1 to 30% by mass, particularly 0.5 to 10% by mass based on the total mass of the coagulation inhibitor. It is selected in the range of mass%.

Further, a surfactant is blended as necessary in order to promote dispersion in the agrochemical formulation dilution water. Examples of the surfactant include polyethylene glycol higher fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene aryl phenyl ether, sorbitan monoalkylate, acetylene alcohol and acetylene diol, and alkylene oxides thereof. Nonionic surfactants such as adducts, alkylaryl sulfonates, dialkyl sulfonates, lignin sulfonates, naphthalene sulfonates and their condensates, alkyl sulfate ester salts, alkyl phosphate ester salts, alkyl aryl sulfate esters Salt, alkyl aryl phosphate ester salt, polyoxyethylene alkyl ether sulfate ester salt, polyoxyethylene alkyl aryl ether sulfate ester , Polyoxyethylene aryl phenyl ether phosphoric acid ester salts, anionic surfactants such as polycarboxylic acid type polymeric activator, and the like. In this powdery coagulation inhibitor, the content of the surfactant is usually 0.1 to 1 based on the total mass of the coagulation inhibitor.
It is selected in the range of 0% by mass.

The colorant is used for facilitating the observation of the blending state and for preventing accidental ingestion. As the colorant, a water-soluble colorant is desirable. Examples of such colorants include Red No. 2, Red No. 3, Red No. 40, Red No. 1
02, red 104, red 105, red 106,
Food dyes such as yellow 4, yellow 5, green 3, blue 1, blue 2 are preferred.

On the other hand, as the liquid coagulation inhibitor, for example, an aqueous solution dissolved in water containing the above-mentioned coagulation accelerator, water or an organic solvent as an extender, and if necessary, a surfactant, a coloring agent, a preservative and the like. Examples thereof include a state or a state of suspension dispersed in an organic solvent. The organic solvent is not particularly limited, but water-soluble organic solvents such as alkylene glycol, alkyl alcohol, alkylpyrrolidone, and glycerin are suitable. Also, these solvents can be used in combination with water.

As the surface active agent and the colorant, the same ones as those exemplified for the powdery solidification inhibitor can be mentioned. Further, as the preservative, for example, benzoic acid, sorbic acid, propionic acid, dehydroacetic acid, pentachlorophenol and salts thereof, 1,2-
Examples thereof include benzisothiazolin-3-one. In this liquid coagulation inhibitor, the content of the coagulation accelerator is usually 0.01 to 5 based on the total mass of the coagulation inhibitor.
It is selected in the range of 0% by mass, preferably 0.1 to 30% by mass, more preferably 0.5 to 10% by mass.

The coagulation inhibitor used in the present invention may be in the form of a powder as described above, but it is in the form of an aqueous solution or an aqueous dispersion since it is easy to handle and has a high dissolution rate in a pesticide formulation diluent. The form of an aqueous solution is particularly preferable.

The pesticide formulation to which the solidification preventing method of the present invention is applied may be any one as long as it is diluted with water and is not particularly limited, and examples thereof include emulsions, wettable powders, and granular wettable powders. Examples thereof include suspension formulations. Among these, it is preferable to apply the method of the present invention to a water-insoluble, solid wettable powder containing a pesticide raw material, a carrier, etc., a granular wettable powder, or a suspension preparation, and further, the particle size is small and sedimentation occurs. Although difficult, it is preferred to apply the method of the present invention to a suspension formulation which, once settled, produces a very firm cake. The method of the present invention is particularly effective when these pesticide formulations are diluted to a high concentration and used as a rice pad seed disinfectant using a dedicated seed disinfecting machine.

[0018] Recently, a pesticide formulation in which a wettable powder is packaged in a film made of polyvinyl alcohol and directly added to water has been distributed. This eliminates the weighing work at the time of diluting a wettable powder, and is a formulation wrapped in a film to prevent dusting, it does not obtain the solution and effect of the problem in the present invention, in the pesticide formulation diluent of the present invention It is completely different from the method for preventing solidification of sediment.

In the method for preventing solidification of the present invention, the pesticide formulation is diluted with water, and then the required coagulation inhibitor is added thereto. At this time, when a coagulation inhibitor is pre-blended with a pesticide formulation, in a liquid formulation such as a suspension formulation, in addition to promoting aggregation in the formulation, a precipitation-solidification-preventing effect is also significantly greater than when added at the time of dilution. Inferior. In addition, when pre-blended into a solid preparation such as a wettable powder or a granular wettable powder, solidification of the preparation during storage may occur. Furthermore, after the pesticide formulation is diluted in water, the precipitate begins to solidify,
When a coagulation inhibitor is added, a sufficient effect of preventing sedimentation and solidification cannot be exhibited.

The amount of the coagulation inhibitor added to the pesticide formulation diluent varies depending on the type of the pesticide formulation, but in the method of the present invention, the coagulation inhibitor does not generate macroscopic aggregates for at least 15 minutes after the addition. It is necessary to add in an unrecognizable amount. Even in the case of agglomeration within 15 minutes, solidification of the pesticide formulation dilution liquid precipitate is suppressed, but the pesticide active ingredient in the dilution liquid cannot be kept homogeneous and the desired effect as a pesticide is not exhibited. The addition amount of the coagulation inhibitor is generally selected in the range such that the coagulation inhibitor as an active ingredient is 0.1 to 1000 ppm with respect to the diluent, but it is preferable to make the concentration as low as possible. .

The present invention also provides a method for disinfecting seeds. In this disinfection method, the above-mentioned coagulation inhibitor is added to a water-diluted solution of a seed disinfectant, and this water-diluted solution is circulated and brought into contact with the seeds or sprayed onto the seeds for disinfection. The amount of the coagulation inhibitor added is as described above.

[0022]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

Reference Example 1 5 parts by mass of aluminum sulfate was dissolved in 95 parts by mass of water to prepare an aqueous solution coagulation inhibitor.

Reference Example 2 20 parts by mass of carboxymethyl cellulose, 2 parts by mass of sodium dodecylbenzenesulfonate and 78 parts by mass of ammonium sulfate were mixed to prepare a powdery coagulation inhibitor.

Reference Example 3 1 part by mass of polyacrylic acid ester was dispersed in 99 parts by mass of propylene glycol to prepare a liquid coagulation inhibitor.

Reference Example 4 0.75 parts by mass of polyvinyl alcohol, 15 parts by mass of ethylene glycol, 76.7 parts by mass of water, and Edible Blue No. 1 7.
An aqueous solution coagulation inhibitor was prepared by dissolving 5 parts by mass and 0.05 parts by mass of 1,2-benzisothiazolin-3-one.

Reference Example 5 2 parts by mass of polyvinylpyrrolidone was dissolved in 98 parts by mass of water to prepare an aqueous solution coagulation inhibitor.

Example 1 (Dispersibility test of sediment for diluting pesticide formulation diluted liquid) A predetermined amount of the coagulation inhibitor obtained in Reference Examples 1 to 5 was added to a liquid obtained by diluting a commercially available pesticide formulation with 250 ml of water and stoppered. Attached 2
After transferring to a 50 ml graduated cylinder and observing the state of the diluted solution after 15 minutes, no aggregation was observed in any of the diluted solutions. After the diluted solution was allowed to stand for 24 hours, the graduated cylinder was repeatedly inverted, and the number of inversions until the precipitate settled on the bottom was dispersed was measured. In addition, the same operation was performed with the case where no coagulation inhibitor was added as a control. In Table 1,
The results are shown together with the types of pesticide formulations, the types of coagulation inhibitors, and the dilution factor.

[0029]

[Table 1] (Note) 1) Kumiai Chemical Industry Co., Ltd. horticultural wettable powder 2) Kumiai Chemical Industry Co., Ltd. horticultural flowable agent 3) Kumiai Chemical Industry Co., Ltd. seed disinfectant flowable agent

As shown in Table 1, the diluted pesticide preparations obtained by adding the coagulation inhibitors obtained in Reference Examples 1 to 5 had a smaller number of inversions as compared with the case where no coagulation inhibitor was added. I find it easy.

Example 2 (Confirmation of the state of sediment in a seed disinfecting machine and a test of whether it can be removed by running water) FIG. 1 shows the seed disinfecting machine used in this example [Seed Disinfecting Machine manufactured by Nippon Vehicle Manufacturing Co., Ltd.] "NMS-100-VD-S
Is a piping system diagram of "type". Volume 4 with stirring blade 8
Seed disinfection floorable agent [Kumiai Chemical Industry Co., Ltd., trade name "Teclead C Flowable"] 7.5 times in a 50 liter chemical tank 1, Sumithion emulsion [Kumiai Chemical Industry Co., Ltd. emulsion] Is 200 times and the coagulation inhibitor obtained in Reference Example 4 is 150 times (50 ppm as the coagulation-preventing concentration in the agricultural chemical formulation diluent), and 250 liters of the agricultural chemical formulation diluent is prepared, and after 15 minutes, the diluent is prepared. As a result of observing the state, no aggregation was observed.

Next, in order to actually disinfect the seeds, the seed disinfecting machine was operated for 10 hours, and the diluted agricultural chemical formulation liquid was circulated as shown below. That is, the agricultural chemical formulation diluted liquid is extracted from the bottom of the chemical liquid tank 1, supplied to the pressure tank 4 by the gear pump 3, further circulated through the pipe 9 to the chemical liquid tank 1, and a part of the diluted liquid has a 9 mm inner diameter. It is circulated to the chemical liquid tank 1 through the meshed hose 10, the electromagnetic flow meter 6 and the meshed hose 11 having an inner diameter of 9 mm. In addition,
Reference numeral 2 is a strainer, 5 is a pressure switch, 7 is a spray nozzle, and 12 is a check valve. All the pipes were made of stainless steel, and the valves used were ball valves.

After circulating the diluted pesticide formulation solution for 10 hours, the state of sediment at points A to F in the piping system diagram of the seed disinfecting machine shown in FIG. It was tested whether the sediment could be removed. Further, as a control, the same operation was performed and observed even when the coagulation inhibitor was not added. The results are shown in Table 2.

[0034]

[Table 2]

As shown in Table 2, when the coagulation inhibitor obtained in Reference Example 4 was added, the sediment in the seed disinfecting machine was soft, could be removed with running water, and was easy to wash.
On the other hand, when the coagulation inhibitor is not added, the sediment is hard,
It could not be removed with running water and cleaning was very difficult.

[0036]

EFFECTS OF THE INVENTION According to the present invention, by adding a coagulation inhibitor to a water-diluted solution of a pesticide formulation, a pesticide active ingredient or the like is deposited in a portion of the spraying device where the flow of the dilution solution is stagnant. Therefore, hard caking does not occur, and therefore, it is possible to easily perform washing after the end of spraying, and it is possible to prevent the effects of the pesticide formulation from being impaired.

[Brief description of drawings]

FIG. 1 is a piping system diagram of the seed disinfecting machine used in Example 2.

[Explanation of symbols]

1 chemical tank 2 strainers 3 gear pump 4 pressure tank 5 Pressure switch 6 Electromagnetic flow meter 7 spray nozzles 8 stirring blades

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shuji Sasaki             895-1 Shimogo, Ogori-machi, Yoshiki-gun, Yamaguchi Prefecture F term (reference) 2B051 AA02 AB01 BA09 BB01                 4H011 AA01 BA01 BA04 BB10 BC18                       BC19 DH02 DH10 DH25

Claims (9)

[Claims] 1. Precipitation in a diluting solution of an agrochemical formulation, which comprises diluting the agrochemical formulation with water and then adding a coagulation inhibitor in an amount such that no agglomerates are generated for at least 15 minutes after the addition. How to prevent solidification of objects. 2. The method for preventing solidification according to claim 1, wherein the agrochemical formulation is a wettable powder, a granular wettable powder or a suspension formulation. 3. The coagulation inhibitor is an inorganic substance.
Or the method for preventing solidification according to 2. 4. The method for preventing solidification according to claim 3, wherein the inorganic substance is at least one selected from aluminum sulfate, polyaluminum chloride and ferric sulfate. 5. The coagulation inhibitor is an organic substance.
Or the method for preventing solidification according to 2. 6. The method for preventing solidification according to claim 5, wherein the organic substance is at least one selected from carboxymethyl cellulose, polyacrylic acid ester, polyvinyl alcohol, alginate, polyvinylpyrrolidone and chitosan. 7. The solidification preventing method according to claim 1, wherein the coagulation inhibitor contains a coloring agent. 8. The method for preventing solidification according to claim 1, wherein the coagulation inhibitor is used in the form of an aqueous solution or an aqueous dispersion. 9. A method of disinfecting seeds, which comprises adding a coagulation inhibitor to a water-diluted solution of a seed disinfectant, contacting the seeds while circulating this water-diluted solution, or spraying the seeds to disinfect them. .