Pretilachlor and bensulfuron methyl spray-drop solution and preparation method thereof

Abstract

The invention relates to a pretilachlor and bensulfuron methyl spray-drop solution and a preparation method thereof. The pretilachlor and bensulfuron methyl spray-drop solution is prepared from the following components in percentage by mass: 10-40% of pretilachlor, 1-4% of bensulfuron methyl, 5-10% of fenclorim, 10-20% of an emulsifier, 2-5% of a diffusant, 0.5-2% of a thickening agent, 0.1-0.5% of a defoaming agent, 1-4% of a pH regulator, 2-5% of a water removing agent and the balance of an oil-base solvent. The preparation method of the pretilachlor bensulfuron methyl spray-drop solution comprises the following steps: adding the pretilachlor raw oil, the emulsifier, the diffusant, the water removing agent, the thickening agent, the defoaming agent and the pH regulator to the oil-base solvent, mixing, stirring, adding bensulfuron methyl raw stock during stirring of a high-speed shearing machine at a rotation speed of 1500-10000rpm, shearing for 10-40 minutes, and grinding till the particle size D90 is smaller than 5mu m by using a grinding machine, thereby obtaining the pretilachlor bensulfuron methyl spray-drop solution. The pretilachlor bensulfuron methyl spray-drop solution has the effects that the quality is stable, the degradation rate of the bensulfuron methyl raw stock can be controlled to be within 10% before and after heat storage, the bensulfuron methyl raw stock can be automatically diffused on a water surface and sunk and emulsified, the purpose of spraying can be achieved, a sealed weeding effect can be achieved, and an effect of reducing operation / saving labor of peasants can be achieved.

Description

technical field [0001] The invention relates to a paddy field spreading herbicide for closed soil and a preparation method thereof, in particular to a pretilachlor and bensulfuron-methyl spraying drop and a preparation method thereof. Background technique [0002] Pretilachlor, other Chinese names: Sofit; [0003] Chemical name: 2-chloro-N-(1-methyl-2-methoxyethyl)-N-(2-ethyl-6-methylphenyl)acetamide; [0004] Structural formula: CA Registration Number: 51218-49-6; Pesticide Category: Herbicide; Chemical Properties: The pure product is a colorless liquid. b.p.135℃ / 0.1Pa, relative density 1.076 (20℃), vapor pressure 0.133×10-3Pa. Easily soluble in most organic solvents, the solubility in water at 20°C is 50mg / L, and the partition coefficient (n-octanol / water) is 12020. It is stable for 2 years when stored at room temperature. At 20°C, the hydrolysis half-life is 200d (pH=1~9), 14d (pH=13), and the half-life in soil is 20~50d. [0005] Features: This product is a pre-em...

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Problems solved by technology

[0010] In the existing pretilachlor and bensulfuron-methyl wettable powders, the thermal storage stability of the original drug of bensulfuron-methyl is poor, and the decomposition rate is as high as 30%, which affects the closed weeding effect, and the dripping agent is a kind of promising development prospect. Pesticide dosage form, stable performance, good adhesion, saving labor and time, achieving significant control effect with one-time application, reducing drug cost and environmental pollution

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