Surface treatment of inorganic pigments by N.EPSILON.-acyllysine.

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概要

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• Inorganic pigments(calcium carbonate, iron oxide, and titanium dioxide) were treated with <I>N</I><SUP>ε</SUP>-lauroyl-L-lysine, which is almost insoluble in both polar and nonpolar solvents. Two methods were employed for the treatment: (1) grinding of various weight proportional mixtures of pigment and the <I>N</I>-acyllysine; (2) adsorption of the <I>N</I>-acyllysine from its calcium ethylate solution on pigment. In method(1), the sufficient hydrophobic treatment was made when the weight percent of the <I>N</I>-acyllysine in the mixture was above about 30%. On the other hand, in method(2), although the amount adsorbed of the <I>N</I>-acyllysine was about in the range of 10<SUP>−6</SUP> mol/g, the treated pigment showed a hydrophobicity. The critical surface tension of the treated samples estimated by using various mixtures of methanol and water was in the range from 23 to 39 dyn/cm.

• 公益社団法人 日本化学会の論文

著者

• Esumi Kunio

  Department Of Applied Chemistry And Institute Of Colloid And Interface Science Science University Of

• Yoshida Shigeki

  Department of Applied Chemistry, Institute of Colloid and Interface Science, Science University of Tokyo

• Meguro Kenjiro

  Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo

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