30%三唑锡悬浮剂的研制及作用机理分析

目的]解决30%三唑锡悬浮剂分散稳定性的问题。方法]为提高30%三唑锡悬浮剂分散稳定性,采用流点法对不同类型的分散剂进行初步筛选并测试表面张力,通过测试SC粒径、Zeta电势、悬浮率、流变性能确定分散剂配比与用量并对分散稳定机理进行分析。结果]与单一分散剂制备SC相比,聚羧酸盐分散剂SD-816和聚氧乙烯醚磷酸酯分散剂SD-208复配体系制备的SC性能较优,其表观黏度、Zeta电势、粒径和悬浮率分别为386 mPa·s、-37.2 mV、2.58μm及98.4%。并且提出了聚羧酸盐分散剂和聚氧乙烯醚磷酸酯分散剂对农药三唑锡可能的分散机理。结论]聚羧酸盐SD-816和聚氧乙烯醚磷酸酯SD-208的复配体系可同时提供静电排斥作用和空间位阻,明显改善SC体系的悬浮稳定性。

Development and Mechanism Analysis of Azocyclotin 30% Suspension Concentrate

Aims] This study aims to solve the problem of dispersion stability of azocyclotin 30% suspension concentrate(SC). Methods] In order to improve the dispersion stability of azocyclotin 30% suspension concentrate, the flow point method was used to screen the dispersants, and the surface tension of dispersant aqueous solution was measured. Then the dispersion mechanism was analyzed by measuring the average particle size, zeta potential,suspension rate and rheological properties. Results] Compared to the formulation prepared by single dispersant, the azocyclotin 30% SC prepared by polycarboxylate dispersant SD-816 and polyoxyethylene ether phosphate dispersant SD-208 performed better. The apparent viscosity, zeta potential, particle size and suspension rate were 386 m Pa·s,-37.2 m V, 2.58 μm and 98.4%, respectively. Moreover, the dispersion mechanism of polycarboxylate dispersant and polyoxyethylene ether phosphate dispersant for pesticide azocyclotin was also proposed. Conclusions] The compound system of polycarboxylate SD-816 and polyoxyethylene ether phosphate SD-208 could significantly improve the suspension stability of the SC system by simultaneously providing electrostatic repulsion and steric hindrance.