Abstract:

In order to prepare Beta-Cyfluthrin EW with good stability and wettability, normal complex emulsifier was used to screen formulation, and determine the particle size distribution of formula with laser particle size instrument, and measure the surface tension and contact angle of formula with OCA20 (used Pendant Drop-method and Sessile & Captive Drop-method respectively). 4 kinds of Beta-Cyfluthrin EW formulation with good stability were found, their D50 were around 0.8-2.12 μm, and the particle size increased after heated storage; the surface tension of liquids ranged from 40 to 53 mN/m, significantly lower than those of deionized water (73.66 mN/m); the contact angle on apple leaves of liquids ranged from 46° to 74°, and obviously decreased within 60 S; In all the 4 kinds of formula, the 13# pesticide contained the lowest surface tension and the minimum contact angle when the solutions were dropped on apple leaves, and the contact angle decreased significantly. The research showed that 4 kinds of formula contained good stability and wet ability, and the 13# formula was the optimum formulation, wetting and spreading fast, so it was suitable for apple tree spraying.