Suspension compounded from difenoconazole and mancozeb and preparation method for suspension

Abstract

The invention discloses a suspension compounded from difenoconazole and mancozeb. Maneb, a dissoluble zinc salt and difenoconazole are taken as initial raw materials, and the maneb and the dissoluble zinc salt are complexed into a mixed preparation in a grinding process. The mixed preparation comprises the following components in percentage by weight: 5 to 40 percent of difenoconazole, 5 to 40 percent of mancozeb, 0.5 to 50 percent of dispersing wetting agent, 0.01 to 0.5 percent of preservative, 1 to 5 percent of antifreezing agent and the balance of water. According to the technical scheme, the maneb and the dissoluble zinc salt are taken as the initial raw materials, and are synthesized into complexed mancozeb in the grinding process, and the generated mancozeb and the difenoconazole are compounded into the suspension. According to a method, the step of drying the mancozeb is eliminated, so that production cost is saved; and moreover, complexing reaction belongs to endothermic reaction, and is favorable for controlling grinding temperature to be far lower than a melting point of the difenoconazole, so that the prepared suspension is high in quality.

Description

technical field [0001] The invention belongs to the technical field of pesticide compounding, and in particular relates to a suspending agent compounded with difenoconazole and mancozeb and a preparation method thereof. Background technique [0002] Difenoconazole is a broad-spectrum systemic fungicide with protective and therapeutic effects. It is mainly used for various crops such as anthracnose, leaf spot, powdery mildew, scab and wheat take-all. Triazole fungicide, melting point 76°C, solubility (20°C): water 3.3mg / L, easily soluble in organic solvents. Mancozeb is an organosulfur protective fungicide, which has a good control effect on tomato early blight, cucumber downy mildew, and apple ring spot. [0003] At present, the existing problem is that for the single agent of difenoconazole and mancozeb, the pathogens develop drug resistance during the use process, which affects the control effect, reduces the utilization rate of the drug, and the cost of use is high. To...

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Problems solved by technology

[0003] At present, the existing problem is that, for the single agent of difenoconazole and mancozeb, the bacteria develop drug resistance during the use process, which affects the control effect, reduces the utilization rate of the drug, and the cost of use is high. To a certain extent, the harm to the environment has been increased

This application has the following disadvantages: (1) During the production process of the powder, it is easy to generate dust and cause environmental pollution; in the process of mixing with water, the powder is easily inhaled into the human body, posing a threat to human health, and the dosage is difficult to control

(2) The above application is simply grinding difenoconazole and mancozeb after mixing, which is equivalent to completing simple physical mixing, and its drug effect is equivalent to the superposition of two single doses, and it is impossible to achieve complex matching effect

However, the melting point of difenoconazole is 76°C. If the sanding parameters are not properly controlled, it is very easy to be higher than 76°C. In addition, the addition of surfactants and antifreeze agents will increase the plasticity and durability of difenoconazole during the grinding process. Lower its melting temperature, while the melting of difenoconazole leads to poor suspension effect on the one hand, and fails to achieve the compounding effect on the other hand

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