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Citation: ZHANG Qian, SUN Yongqiang, ZHI Lifeia, ZHANG Yong, SUN Jinyuan, WU Huaping, DI SERIO Martino. Dynamic Surface Tensions of Castor Oil Acid Methyl Ester Ethoxylate Aqueous Solutions[J]. Chinese Journal of Applied Chemistry, ;2015, 32(6): 689-694. doi: 10.11944/j.issn.1000-0518.2015.06.140305 shu

Dynamic Surface Tensions of Castor Oil Acid Methyl Ester Ethoxylate Aqueous Solutions

1.
a China Research Institute of Daily Chemical Industry, Taiyuan 030001, China;
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b Department of Chemical Sciences, University of Naples Federico Ⅱ, M. Napoli 80126, Italy

Corresponding author: SUN Yongqiang,
Received Date: 2 September 2014
Available Online: 11 February 2015
Fund Project: 国家国际科技合作专项项目(2013DFA42120) (2013DFA42120)山西省国际科技合作项目(2013081019) (2013081019)国家科技支撑项目(2012BAD32B10) (2012BAD32B10)

The dynamic surface tensions of different average ethylene oxide(EO) adduct number(10,12,14,16,and 20) of ethoxylated castor oil acid methyl esters(ECAME) were measured by maximum bubble pressure method(MBP). The effect of dynamic surface tension at different concentration,temperature and the presence of inorganic electrolyte were investigated. The dynamic surface tension parameters(EO adduct number n,equilibrium time t^*,maximum slope of curve R_1/2) of different concentration were discussed. The results show that dynamic surface tension increases with the average n increasing from 10 to 20,n decreases from 3.02 to 1.05,t^* decreases from 14.45 to 2.29,and R_1/2increases from 0.43 to 6.44,while the concentration of ECAME ranges from 0.5×10^-5 to 10×10^-5 mol/L. Therefore,the dynamic surface activity increases and the dynamic surface tension decreases. The dynamic surface tension decreases with the temperature increasing from 25℃ to 45℃. The initial adsorption dynamic surface tension increases with the increasing of inorganic electrolyte concentration and the late adsorption dynamic surface tension decreases with the increasing of inorganic electrolyte concentration. Comparing with conventional fatty acid methyl ester ethoxylate(FMEE),ECAME has an excellent dynamic surface activity. This indicates a new direction for the application of ECAME.
- ethoxylated castor oil acid methyl esters,
- dynamic surface tension,
- concentration,
- temperature,
- inorganic electrolyte
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