Chinese Journal of Applied Chemistry

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Physical Stability of Ametryne Suspension Concentrate

LI Hui, LU Fusui*, WANG Huying, ZHAI Lili, LI Xiuli   

  1. (College of Chemistry and Materials Science,Shandong Agricultural University,Tai′an 271018)
  • Received:2011-04-18 Revised:2011-07-18 Published:2012-03-10 Online:2012-03-10
  • Contact: LU Fusui

Abstract: Effects of dispersants and mass fraction on the physical stability of ametryne suspension concentrate were studied by the average particle size measurement and morphology characterization. The results showed that maleic rosin-polyoxypropylene-polyoxyethylene ether sulfonate(SC-3) formed double-layer adsorption on the surface layer of pesticide, resulting in two-layer static shield system. This system could effectively prevent the particles and water from contacting with each other, inhibiting particle agglomeration and crystal growth by Ostwald ripening. The average particle size and the particle morphology changed little after heat storage due to the restraint of crystal growth. The best physical stability was achieved when the dosage of SC-3 was over 4%.

Key words: ametryne, suspension concentrate, average particle size, Ostwald ripening, Stability

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