Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (6): 689-694.DOI: 10.11944/j.issn.1000-0518.2015.06.140305

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

ZHANG Qiana, SUN Yongqianga, *, ZHI Lifeia, ZHANG Yonga, SUN Jinyuana, WU Huapinga, DI SERIO Martinob   

  1. aChina Research Institute of Daily Chemical Industry,Taiyuan 030001,China
    bDepartment of Chemical Sciences,University of Naples Federico Ⅱ,M. Napoli 80126,Italy
  • Received:2014-09-02 Accepted:2015-02-11 Online:2015-06-10 Published:2015-06-10
  • Contact: Yongqiang SUN
  • Supported by:
    Supported by the National Science and Technology Support Project of International(No.2013DFA42120), International Science and Technology Cooperative Project of Shanxi Province(No.2013081019), Natural Science and Technology Support Project of China(No.2012BAD32B10)

Abstract:

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 R1/2) 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 R1/2 increases 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.

 

Key words: ethoxylated castor oil acid methyl esters, dynamic surface tension, concentration, temperature, inorganic electrolyte

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