JP5235255B2 - Seed disinfection method - Google Patents

Description

  The present invention relates to a method for preventing sedimentation of a pesticide preparation that is used when diluted in water, which solidifies solidly and inhibits the work, and impairs the effect of the pesticide preparation. This relates to the seed disinfection method used.

  Currently, as agrochemical formulations, there are granules, powders, emulsions, wettable powders, liquids, flowables, granular wettable powders, jumbo drugs, etc. Among these, emulsions, wettable powders, liquids, flowables, The granular wettable powder is a preparation used by diluting in water. Preparations diluted in water are usually diluted several to several thousand times in the chemical tank of the spraying device, and at that time, the pesticidal active ingredient and the carrier are suspended or emulsified in water. However, these substances that are water-insoluble and have a higher specific gravity than water are unavoidable to gradually settle over time.

  Since a relatively long time is required for spraying agricultural chemicals, if an agricultural chemical active ingredient or the like settles in the diluting solution during that time, it causes dispersion unevenness, and it is necessary to maintain a uniform diluted state as much as possible. Therefore, in agrochemical formulations, it is common practice to reduce the particle size of agrochemical active ingredients, etc., slow the sedimentation rate in water, or disperse them into single particles by the action of a surfactant in the formulation.

  In addition, it is also common to maintain a uniform dilution state by mechanically stirring the chemical tank of the spraying device, but in the discharge pipe where the flow of diluent is stagnant in the flow path until spraying, etc. In this case, the active ingredients of agricultural chemicals settle and accumulate, causing hard caking, causing valve opening and closing of the flow path of the spraying device during spraying, clogging of the spray nozzle, It may make cleaning and cleaning difficult, and the effect of the pesticide preparation may be lost. Especially when diluting in large quantities and spraying with a sprinkler that requires a long flow path from the chemical tank to the spray nozzle and using a regulating valve such as a pressurizing valve, or diluting with high concentration to disinfect seeds and air spray In some cases, troubles due to caking often occur and improvements are desired, but no effective technique has been known so far.

Problems to be solved by the invention

  Under such circumstances, the present invention produces a precipitate when the agrochemical preparation is diluted with water and used, which solidifies solidly and obstructs the work and impairs the effect of the agrochemical preparation. It was made for the purpose of providing the method for preventing, and the disinfection method of the seed using it.

Means for solving the problem

  As a result of intensive research on the method for preventing solidification of sediment in a water dilution of an agrochemical formulation, the present inventors have found that agglomerates are generated at least for a certain time after the addition of a coagulation inhibitor to the water dilution of an agrochemical formulation. It was found that by adding the amount not possible, solidification of the sediment in the diluted water can be prevented, and the object can be achieved, and the present invention has been completed based on this finding.

  That is, the present invention provides a seed disinfecting method in which a coagulation inhibitor is added to a seed diluting agent water dilution, and the water diluting solution is contacted with seeds while circulating in the seed disinfecting machine or sprayed on the seeds to disinfect. The seed disinfectant is a suspension preparation, and the dilution factor of the seed disinfectant in the water dilution is selected in the range of 7.5 to 200 times. It is at least one selected from aluminum sulfate, polyaluminum chloride, ferric sulfate, carboxymethylcellulose, polyacrylic acid ester, polyvinyl alcohol, alginate, polyvinylpyrrolidone and chitosan, and for the water dilution And providing a seed disinfection method characterized in that the addition amount of the coagulation inhibitor as an active ingredient is selected within a range of 0.1 to 1000 ppm. Is shall.

The coagulation inhibitor used in the method for preventing solidification of sediment in the diluted agricultural chemical formulation of the present invention is generally used as an agglomeration accelerator in industrial wastewater treatment and the like. Either can be used.
Examples of the inorganic coagulation inhibitor include inorganic aggregation promoters such as aluminum sulfate, polyaluminum chloride, and ferric sulfate, and these may be used alone or in combination of two or more. .

  On the other hand, organic coagulation inhibitors include, for example, organic agglomerates composed of water-soluble polymer compounds such as vinyl polyamidine, polymethacrylic acid ester, polyacrylic acid ester, carboxymethyl cellulose, polyvinyl alcohol, alginate, polyvinyl pyrrolidone, and chitosan. Accelerators are mentioned. Among these, carboxymethyl cellulose, polyacrylic acid ester, polyvinyl alcohol, alginate, polyvinyl pyrrolidone and chitosan are preferable, and polyvinyl alcohol is particularly preferable. The above organic coagulation inhibitors may be used alone or in combination of two or more. In the present invention, the inorganic coagulation inhibitor and the organic coagulation inhibitor can be used in combination.

  The coagulation inhibitor used in the present invention may be composed of only the above-mentioned aggregation accelerator, and may contain a bulking agent, a surfactant, a colorant and the like together with the aggregation accelerator as desired. The coagulation inhibitor may be in the form of powder or liquid.

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

Further, the surfactant is blended as necessary in order to promote dispersion in the agricultural chemical preparation 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 sulfates, alkyl phosphates, alkylaryl sulfates Salt, alkylaryl 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 selected in the range of 0.1 to 10% by mass based on the total mass of the coagulation inhibitor.

  The colorant is used for facilitating the observation of the blended state and for preventing accidental eating. 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. 102, Red No. 104, Red No. 105, Red No. 106, Yellow No. 4, Yellow No. 5, Green No. 3, Food dyes such as Blue No. 1 and Blue No. 2 are preferable.

  On the other hand, as the liquid coagulation inhibitor, for example, the above-mentioned aggregation accelerator and water or an organic solvent as an extender, and optionally containing a surfactant, a coloring agent, a preservative, etc. Examples thereof include a suspended state dispersed in a solvent. Although it does not specifically limit as said organic solvent, Water-soluble organic solvents, such as alkylene glycol, alkyl alcohol, alkyl pyrrolidone, and glycerol, are suitable. These solvents can also be used in combination with water.

  Moreover, as a surfactant and a coloring agent, the same thing as what was illustrated in the said powdery coagulation inhibitor can be mentioned. Furthermore, examples of the preservative include benzoic acid, sorbic acid, propionic acid, dehydroacetic acid, pentachlorophenol and salts thereof, 1,2-benzisothiazolin-3-one, and the like. In this liquid coagulation inhibitor, the content of the aggregation accelerator is usually 0.01 to 50% by mass, preferably 0.1 to 30% by mass, more preferably 0.5 to 0.5% based on the total mass of the coagulation inhibitor. It is selected in the range of 10% by mass.

  The coagulation inhibitor used in the present invention may be in the form of a powder as described above. However, because of its ease of handling and the rapid dissolution rate in an agrochemical formulation diluent, the form of an aqueous solution or aqueous dispersion, particularly an aqueous solution The form is preferred.

  The agrochemical formulation to which the solidification preventing method of the present invention is applied is not particularly limited as long as it is diluted with water and used, for example, emulsion, wettable powder, granular wettable powder, suspension preparation. And so on. Among these, it is preferable to apply the method of the present invention to wettable powders, granular wettable powders or suspension preparations containing a non-water-soluble solid agrochemical base or carrier, and the particles are settled with a small particle size. Although difficult, it is preferred to apply the method of the present invention to a suspension formulation that, once settled, produces a very strong cake. In addition, the method of the present invention is particularly effective when these agricultural chemical preparations are diluted to a high concentration and used as a rice straw seed disinfectant using a dedicated seed disinfectant.

  In recent years, agricultural chemical formulations in which a wettable powder is packaged in a film made of polyvinyl alcohol and directly poured into water are in circulation. This is a preparation wrapped in a film in order to eliminate the weighing work at the time of diluting wettable powder and prevent powdering, and does not obtain the solution and effect of the problem in the present invention. This is completely different from the method for preventing sedimentation.

  In the anti-caking method of the present invention, a pesticide preparation is diluted with water, and then a required coagulation inhibitor is added thereto. At this time, when a coagulation inhibitor is pre-mixed in an agrochemical formulation, the liquid formulation such as a suspension formulation promotes aggregation in the formulation, and also has a significant effect of preventing sedimentation and solidification compared to the case where it is added at the time of dilution. Inferior. Moreover, when it mix | blends beforehand with solid preparations, such as a wettable powder and a granular wettable powder, solidification of the preparation during a preservation | save may arise. Further, when the coagulation inhibitor is added after the sediment starts to solidify after diluting the pesticide preparation in water, a sufficient effect of preventing sedimentation and solidification is not exhibited.

  The amount of the coagulation inhibitor added to the diluted agricultural chemical formulation varies depending on the type of the agricultural chemical formulation, but in the method of the present invention, the coagulation inhibitor is not observed to be aggregated on the naked eye for at least 15 minutes after the addition. It is necessary to add in an amount. Even in the case of aggregation within 15 minutes, solidification of the sediment of the agrochemical formulation diluted solution is suppressed, but the agrochemical active ingredient in the diluted solution cannot be kept homogeneous, and the desired effect as an agrochemical is not exhibited. The amount of the coagulation inhibitor to be added is generally selected in such a range that the coagulation inhibitor as an active ingredient is 0.1 to 1000 ppm with respect to the diluted solution, 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 dilution solution of a seed disinfectant, and the water dilution solution is circulated to contact with seeds or sprayed on the seeds for disinfection. The amount of the coagulation inhibitor added is as described above.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by 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 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
A liquid coagulation inhibitor was prepared by dispersing 1 part by mass of a polyacrylic ester in 99 parts by mass of propylene glycol.

Reference example 4
In 76.7 parts by weight of water, 0.75 parts by weight of polyvinyl alcohol, 15 parts by weight of ethylene glycol, 7.5 parts by weight of edible blue No. 1, 0.05 part by weight of 1,2-benzisothiazolin-3-one are dissolved, An aqueous coagulation inhibitor was prepared.

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

Example 1 (dispersibility test of agrochemical preparation dilution sediment)
A predetermined amount of the coagulation inhibitor obtained in Reference Examples 1 to 5 was added to a solution obtained by diluting a commercially available agrochemical formulation with 250 ml of water, and transferred to a 250 ml graduated cylinder with a stopper, and the state of the diluted solution was observed after 15 minutes. As a result, no aggregation was observed in any of the diluted solutions. After leaving this diluted solution for 24 hours, the graduated cylinder was repeatedly inverted, and the number of inversions until the sediment 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.
Table 1 shows the results of the agricultural chemical preparation, the type of coagulation inhibitor, and the dilution factor.

（注）
１）クミアイ化学工業（株）製園芸用水和剤
２）クミアイ化学工業（株）製園芸用フロアブル剤
３）クミアイ化学工業（株）製種子消毒用フロアブル剤

(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, since the agrochemical formulation diluent added with the coagulation inhibitor obtained in Reference Examples 1 to 5 has a smaller number of inversions compared to the case where it is not added, the sediment may be easily dispersed. I understand.

Example 2 (Confirmation of sediment state in seed disinfection machine and removal possibility test with running water)
FIG. 1 is a piping system diagram of a seed disinfecting machine [manufactured by Nippon Vehicle Manufacturing Co., Ltd., seed disinfecting machine “NMS-100-VD-S type”] used in this example.
In a chemical tank 1 having a capacity of 450 liters equipped with a stirring blade 8, a flowable agent for seed disinfection [Kumiai Chemical Industry Co., Ltd., trade name “Techlead C Flowable”] is 7.5 times, and Sumithion emulsion [Kumiai Chemical Industry]. Prepared 250 liters of agricultural chemical formulation dilution so that the emulsion produced by Co., Ltd. was 200 times and the coagulation inhibitor obtained in Reference Example 4 was 150 times (50 ppm as the anticoagulation concentration in the agricultural chemical formulation dilution). As a result of observing the state of the diluted solution after 15 minutes, no aggregation was observed.

  Next, in order to perform actual seed disinfection, the seed disinfection machine was operated for 10 hours, and the agrochemical preparation diluted solution was circulated as shown below. That is, the agrochemical formulation diluent is extracted from the bottom of the chemical solution tank 1, supplied to the pressure tank 4 by the gear pump 3, and further circulated through the pipe 9 to the chemical solution tank 1, with a part of the inner diameter being 9 mm. It is circulated to the chemical liquid tank 1 through a meshed hose 10, an electromagnetic flow meter 6 and a meshed hose 11 having an inner diameter of 9 mm. Reference numeral 2 is a strainer, 5 is a pressure switch, 7 is a spray nozzle, and 12 check valve. Also, all the pipes were made of stainless steel, and all the valves used ball valves.

After circulating the agrochemical preparation diluted solution for 10 hours, the state of the sediment at the points A to F in the piping system diagram of the seed disinfector shown in FIG. It was tested whether it could be removed.
Further, as a control, the same operation was performed and observed when no coagulation inhibitor was added. The results are shown in Table 2.

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

Effect of the invention

  According to the present invention, by adding a coagulation inhibitor to the water dilution of the agricultural chemical formulation, the agricultural chemical active ingredient or the like is deposited on the portion where the flow of the dilution liquid in the spraying device stagnates, resulting in hard caking. Therefore, cleaning after the end of spraying can be easily performed, and the effect of the agricultural chemical formulation can be prevented from being spoiled.

  The piping system figure of the seed disinfection machine used in Example 2.

DESCRIPTION OF SYMBOLS 1 Chemical liquid tank 2 Strainer 3 Gear pump 4 Pressure tank 5 Pressure switch 6 Electromagnetic flowmeter 7 Spray nozzle 8 Stirring blade

Claims (3)

A seed disinfecting method in which a coagulation inhibitor is added to a water dilution of a seed disinfectant, and the water dilution is circulated in a seed disinfecting machine to come into contact with seeds or sprayed on the seeds for disinfection.
The seed disinfectant is a suspension preparation, and the dilution factor of the seed disinfectant in the water dilution is selected in the range of 7.5 to 200 times,
Further, the coagulation inhibitor is at least one selected from aluminum sulfate, polyaluminum chloride, ferric sulfate, carboxymethylcellulose, polyacrylic acid ester, polyvinyl alcohol, alginate, polyvinylpyrrolidone and chitosan, and The seed disinfection method , wherein the addition amount of a coagulation inhibitor as an active ingredient is 0.1 to 1000 ppm with respect to the water dilution .
Disinfection process according to claim 1 Symbol placing seed coagulation inhibitor contains a colorant.
The seed disinfection method according to claim 1 or 2, wherein the coagulation inhibitor is used in the form of an aqueous solution or an aqueous dispersion.

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