水中油滴型エマルジョンの流動性に及ぼす因子について : レオロジー一般

概要

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The flow properties of O/W type emulsions (liquid-paraffin in water) have been investigated, covering both Newtonian and non-Newtonian flow range. The combinations of emulsifier are ; Tween 60 (polyoxyethylene sorbitan monostearate) -G.M.S. 8glyceryl monostearate), Tween 60-Arlacel 60 (sorbitan monostearate) and Tween 60-fatty alcohols (n-C_<19>OH and n-C_<16>OH). These emulsions generally show Newtonion flow in the range of relatively low dispersion concentration. The stability of emulsion and its viscosity coefficient depend on kind and concentration of the emulsifying agents contained in oil phase. In the system of Tween 60-G.M.S., flow unit is considered to be the dispersed particle with a number of hydration layers, and Einstein's theoretical equation concerning the suspension of spherical particles has been applied present emulsions, neglecting the influence of emulsifying agents. A linear relationship has been obtained for logη_<rel>~φ curve and its slope has been found to be proportional to G.M.S. concentration in oil phase. Measurements for Tween 60-Arlacel 60 and fatty alcohol systems, in the dispersion state in which Newtonian flow is observed, can not be accurate because of instability of the emulsions. Their dispersed particles have a tendency to be hydrophobic and form aggregate and the flow unit has been found to be an aggregate of several dispersed particles.
社団法人日本材料学会の論文
1960-04-15