The Effect of Pigments on the Stability of Emulsions
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概要
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It was shown through experiments that pigments addition in emulsions can be related to emulsion stability.The stability evaluation was conducted by preparing emulsions containing nonioric emulsifiers, adding thereto pigments (oxide red of iron, ochre, clay and carbon black from 0.1 to 10% for the quantity of emulsions) and keeping such mixtures at the temperatures ranging from 50° to 80° for an hour.Emulsion stability is affected considerably by pigments addition and in most cases is broken. However, it was recognized that the degrees of the affection vary according to the kind and concentration of emulsifiers, the kind of oils, etc., which compose the emulsions. Some differences in the effect are caused by the kind of the pigments added. The pH value also has some effect on the breaking state of emulsions.It is generally noted that the higher temperature is retained, the more outstanding this phenomenon of emulsion breakage becomes.
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