Trifloxystrobin and tebuconazole compound nano bactericide and preparation method thereof

Abstract

The invention discloses a trifloxystrobin and tebuconazole compounded nano bactericide and a preparation method thereof. The preparation method of the bactericide comprises the following steps: S1, weighing, by mass, 10-20% of trifloxystrobin, 10-40% of tebuconazole, 4-8% of an emulsifying dispersant, 2-6% of a dispersing wetting agent, 1-5% of a viscosity reducer, 10-15% of a synergist, 0.1-0.5% of a binder, 1-3% of a PH regulator, 0.1-2% of a defoaming agent, and the balance of water. S2, mixing part of water with all the emulsifying dispersant, and then mixing with trifloxystrobin and tebuconazole to obtain a first solid-liquid mixture; S3, uniformly mixing the first solid-liquid mixture with other raw materials except the synergist to obtain a second solid-liquid mixture; S4, grinding the second solid-liquid mixture until the particle size is less than or equal to 5 microns to obtain a coarse grinding mixture; S5, grinding the coarse grinding mixture until the particle size is less than or equal to 600 nm to obtain a fine grinding mixture; and S6, adding the synergist into the finely ground mixture, and uniformly mixing to obtain the trifloxystrobin and tebuconazole compounded nano bactericide. The trifloxystrobin and tebuconazole compounded nano bactericide disclosed by the invention has the advantages of good dispersity, strong permeability, obvious pesticide effect and the like.

Description

technical field [0001] The invention relates to the related technical field of crop fungicides, in particular to a trifloxystrobin tebuconazole compound nano fungicide and a preparation method thereof. Background technique [0002] Trifloxystrobin is a new class of fluorine-containing fungicides developed with natural product Strobilurins as fungicide lead compounds. Trifloxystrobin has the characteristics of high efficiency, broad spectrum, protection, treatment, eradication, penetration, systemic activity, resistance to rain erosion, long-lasting effect, etc. It is effective against 1,4-demethylase inhibitors, benzamides , dicarboxylamines and benzimidazole-resistant strains are effective, and have no cross-resistance with existing fungicides. It has good activity against almost all fungal diseases (Ascomycetes, Basidiomycetes, Oomycetes and Deuteromycetes) such as powdery mildew, rust, blight, net spot, downy mildew, rice blast, etc. . In addition to having special eff...

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Problems solved by technology

[0004] Wettable powder is obtained by pulverizing materials at room temperature with an ordinary pulverizer. The fineness basically passes through a 45μm wet sieve, and the particle spectrum is wide. Moreover, wettable powder is dusty during processing, which is very easy to produce product crossover. Pollution problems; moreover, because of the large particle size of the wettable powder, the suspension rate index is relatively low, and the particle size is too large to easily cause phytotoxicity; at the same time, the melting points of trifloxystrobin and tebuconazole are relatively low, and the temperature control in the production process If it is not good, it will cause the material to melt and reduce the dispersion ability and efficacy. After a period of time, it will reunite and cannot be dispersed. At the same time, the effect of use will be greatly reduced.

[0005] The preparation method of spray solid granules is spray granulation method. The particles produced by this granulation method are relatively fine and the suspension rate is relatively high, but the production energy consumption is large, and the cost of the auxiliary agents used in production is high, and the drug effect is durable It is also very short; and, as mentioned above, the melting point of trifloxystrobin and tebuconazole is relatively low, while the drying temperature of spray granulation is high, and it is difficult to control the drying temperature. Usually, it needs to be above 110°C to obtain dried products, which lead to the same problems as wettable powders: poor dispersibility, easy agglomeration, poor drug effect, and its fine and uneven particles will also make the drug effect of the product less durable, and it is necessary to reduce dilution when applying Doubling or increasing the number of uses, resulting in an increase in the cost of use

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