Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (07): 661-664.doi: 10.3866/PKU.WHXB20020720

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Stability of Agrochemical Microemulsions at Low Temperature

Chen Fu-Liang;Wang Yi;Zheng Fei-Neng;Liang Wen-Ping   

  1. Key Laboratory of Pesticide Chemistry & Application Technology,Ministry of Agriculture, Beijing 100094, Department of Chemical Sciences, NSFC, Beijing  100085
  • Received:2001-11-22 Revised:2002-02-02 Published:2002-07-15
  • Contact: Chen Fu-Liang

Abstract: The stability of microemulsion at low temperature is one of the technical indices of microemulsion quality. The major factors affect the stability at low temperature are organic solvents, surfactants, cosolvent and water quality. In this paper, three formulated microemulsions were studied,namely, 2.5% imidacloprid ME, 5% diniconazole ME and 10% pyridaben ME. It was found that there is at least one break point or organic solvent concentration above which a pesticide could be solved stably in the organic solvent and the stability of the system could be prolonged at low temperature. However, one should keep in mind that minimum use of organic solvent will benefit the environmental protection. The concentration and the balance of the hydrophilicity and lipophilicity of the added surfactants in the system play a key role on the stability of agrochemical microemulsions.

Key words: Microemulsion, Transparencytemperature section, Stability at low temperature, Organic solvent, Surfactant