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Citation: Chen Fu-Liang, Wang Yi, Zheng Fei-Neng, Liang Wen-Ping. Stability of Agrochemical Microemulsions at Low Temperature[J]. Acta Physico-Chimica Sinica, ;2002, 18(07): 661-664. doi: 10.3866/PKU.WHXB20020720 shu

Stability of Agrochemical Microemulsions at Low Temperature

1.
Key Laboratory of Pesticide Chemistry ＆ Application Technology，Ministry of Agriculture， Beijing　100094, Department of Chemical Sciences, NSFC, Beijing 　100085

Received Date: 22 November 2001
Available Online: 15 July 2002

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.
- Microemulsion;Transparencytemperature section;Stability at low temperature;Organic solvent;Surfactant
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