Glufosinate-ammonium dispersible oil suspension and preparation method therefor

Abstract

The invention discloses a glufosinate-ammonium dispersible oil suspension. The glufosinate-ammonium dispersible oil suspension is prepared from the following substances in percentage by weight: 5% to30% of glufosinate-ammonium, 5% to 20% of emulsifier, 1% to 5% of wetting dispersant, 0.1% to 5% of thixotropic agent and the balance of dispersing medium. The preparation method for the glufosinate-ammonium dispersible oil suspension comprises the following steps: (1) uniformly mixing and dispersing the emulsifier, the oil-phase-soluble wetting dispersant and the dispersing medium; (2) adding original glufosinate-ammonium; (3) adding the thixotropic agent, carrying out stirring and mixing, and then, carrying out high-velocity shearing; and (4) carrying out sanding for 1 to 2 hours until the grain size D90 is 5 microns or less under the condition of a grinding medium. The glufosinate-ammonium dispersible oil suspension disclosed by the invention is relatively low in oil deposition during normal-temperature and hot storage, can restore original condition through shaking at room temperature and is free of a deposition phenomenon; and the glufosinate-ammonium dispersible oil suspension has good hot storage stability and low-temperature stability, is safe and environmentally friendly and is resistant to rainfall erosion, good in pesticide effect and long in effect duration.

Description

technical field [0001] The invention relates to the field of pesticides, in particular to a glufosinate-ammonium dispersible oil suspension and a preparation method thereof. Background technique [0002] Glufosinate-ammonium is a phosphonic acid herbicide, a glutamine synthesis inhibitor, and a non-selective contact herbicide with partial systemic action. Glufosinate-ammonium has low toxicity, easy to degrade in soil, safe for crops, not easy to drift, wide herbicidal spectrum, high activity, good absorption, low environmental pressure, rapid weed control, and can quickly kill more than 100 species of grasses and broadleaves weeds. At the same time, it is also the second most herbicide-tolerant genetically modified crop in the world, and has been widely used in Japan, South Korea, Southeast Asia, America, Europe and other countries or regions. In China, with the large-scale and repeated use of glyphosate, a large number of weeds have developed resistance, and paraquat aque...

AI Technical Summary

Problems solved by technology

[0005] However, vegetable oil still has some shortcomings as a common dispersion medium for dispersible oil suspensions: some vegetable oils have poor solubility, high volatility, difficult emulsification, and high cost, which limits the popularization and application of vegetable oil solvents to a certain extent; It is less stable than organic solvents, and different kinds of vegetable oils have different freezing points, which are easily affected by different sources of plants and storage and transportation conditions; therefore, the source and type of vegetable oil have a greater impact on the low-temperature stability and emulsification dispersibility of dispersible oil suspension concentrates

After many experiments, it was found that there are many problems in the preparation of glufosinate-ammonium dispersible oil suspension concentrate that are difficult to solve: (1) glufosinate-ammonium itself is a salt, and there are very few auxiliaries that can be selected during processing, and the components of the system match The requirements are very high; (2) The composition of vegetable oil is relatively complex, and the glufosinate-ammonium technical product has high requirements on the vegetable oil dispersion medium when processing the dispersible oil suspension. Viscosity, freezing point and HLB value, reduce the influence of low temperature and solve the difficult problem that the dispersion medium is not easy to emulsify; (3) After long-term storage of the glufosinate-ammonium dispersible oil suspension preparation, the preparation has a lot of oil separation (often greater than 20% or more), normal temperature or It is easy to thicken and form a bottom when stored in heat; (4) The preparation is easy to agglomerate after long-term storage

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