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Preparation method of pyraclostrobin microcapsules

A technology of pyraclostrobin and microcapsules, which is applied in the field of pesticides, can solve the problems that the drug effect is difficult to last to the plants, the duration of the effect is short, and the workload is heavy, so as to reduce the number of application times, improve the safety, and improve the production process. simple effect

Inactive Publication Date: 2015-08-12
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few pesticides registered in my country for the prevention and control of peanut soil-borne diseases, and the duration of efficacy is short, and the efficacy is difficult to last until the middle and late stages of plant growth. Closing line, a large amount of water is needed to penetrate the soil when filling the pier, and the liquid medicine must be poured into the roots of the peanut plants, which requires a large amount of work and requires the cooperation of multiple people

Method used

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  • Preparation method of pyraclostrobin microcapsules
  • Preparation method of pyraclostrobin microcapsules
  • Preparation method of pyraclostrobin microcapsules

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The preparation method of 25% pyraclostrobin microcapsule suspension comprises steps:

[0035] 1) Add 26.32 g of 95% pyraclostrobin technical substance into 10 g of xylene to fully dissolve, then add 3.15 g of toluene diisocyanate and 1.55 g of PEG 600, stir well, and use it as the oil phase;

[0036] 2) 0.2 g tristyrylphenol polyoxyethylene ether (emulsifier), 3 g calcium lignosulfonate (dispersant) and 0.1 g polyvinyl alcohol (colloidal protective agent) were uniformly mixed with 53.54 g water as the water phase;

[0037] 3) The oil phase is mixed with the water phase, and sheared and emulsified by a high-speed homogenizer to obtain a stable O / W emulsion;

[0038] 4) Transfer the O / W emulsion to a flask, stir at a speed of 200 rpm, raise the temperature to 65°C, react for 4 hours, adjust the pH value to 6-6.5 with citric acid; add 2 g of ethylene glycol, 0.14 g The xanthan gum was evenly stirred to obtain 25% pyraclostrobin microcapsule suspension.

Embodiment 2

[0039] Embodiment 2, embodiment 3, embodiment 4 respectively change " toluene diisocyanate " in embodiment 1 into " diphenylmethane diisocyanate ", " isophorone diisocyanate " and " hexamethylene diisocyanate ", other unchanged, prepare 25% pyraclostrobin microcapsule suspension respectively.

[0040] The pyraclostrobin microcapsule suspension prepared in Example 2 has an encapsulation rate ≥ 93%, a particle size range of 0.4-15 μm, a suspension rate ≥ 92%, persistent foaming (after 1 min) ≤ 20 mL, and a pH value of 6.0 -6.5, heat storage and freeze-thaw stability qualified.

Embodiment 5

[0042]The preparation method of 10% pyraclostrobin microcapsules water-dispersible granules, the steps are:

[0043] 1) Add 42.11 g of 95% pyraclostrobin technical substance into 16 g of xylene to fully dissolve, then add 3.55 g of diphenylmethane diisocyanate and 1.25 g of PEG 1000, stir well, and use it as the oil phase;

[0044] 2) 0.50g of fatty alcohol polyoxyethylene ether (emulsifier), 3g of sodium lignosulfonate (dispersant) and 0.1g of polyvinyl alcohol (colloidal protective agent) are uniformly mixed with 55g of water as the water phase;

[0045] 3) The oil phase is mixed with the water phase, and sheared and emulsified by a high-speed homogenizer to obtain a stable O / W emulsion;

[0046] 4) Transfer the O / W emulsion to a flask, stir at a speed of 200 rpm, heat up to 65°C, react for 4 hours, adjust the pH value to 6-6.5 with acetic acid, mix with 286.69g kaolin, 32g lignosulfonic acid Calcium, 8g NNO, 4g sodium lauryl sulfate and 4g ammonium chloride were uniformly ...

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Abstract

The invention discloses a preparation method of pyraclostrobin microcapsules and belongs to the technical field of agricultural pesticides. The preparation method comprises the following steps: dissolving a crude drug at first, and then mixing the dissolved crude drug with isocyanate and polyethylene glycol; then dispersing the mixture in a water phase containing a surfactant and a colloid protecting agent, solidifying into capsules, and adjusting the pH value to obtain a microcapsule suspension; and on the basis of the suspension, adding a suspensions stabilizer to prepare a microcapsule suspension agent, or adding a solid auxiliary material to prepare microcapsule water dispersion granules. Diphenyl methane diisocyanate is particularly used as a material for preparing polyurethane capsule walls in the preparation method disclosed by the invention. The toxicity of the pyraclostrobin microcapsules prepared by the method disclosed by the invention to plant algae, daphnia magna and zebra fishes is obviously lower than that of pyraclostrobin missible oil, and the microcapsules can be used for preventing and treating plant leaf diseases of downy mildew, powdery mildew, late blight and the like of vegetables and can also be used for preventing and treating plant soil borne diseases of root rot, crown rot, southern blight and the like.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a method for preparing pyraclostrobin microcapsules. Background technique [0002] Pyraclostrobin is a methoxyacrylate fungicide developed by BASF in Germany. It has no cross-resistance with commonly used fungicides and has a good effect on fungal diseases. Most of the diseases caused by pathogens such as fungi and oomycetes have protective and therapeutic activities. In addition to the direct effect on pathogenic bacteria, pyraclostrobin can also induce plant disease resistance. Its health care and yield-increasing effect has been recognized by the US Environmental Protection Agency. It is one of the main varieties of agricultural fungicides and has been used in 50 Registered for more than 100 crops in several countries. [0003] Although pyraclostrobin exhibits high activity and broad spectrum against plant diseases, it is highly toxic to aquatic organisms, and its widespr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N47/24A01N25/28A01P3/00
Inventor 刘峰慕卫张大侠
Owner SHANDONG AGRICULTURAL UNIVERSITY
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