Measurement of Acid and Base Amounts of Titanium Dioxide Pigments and the Dispersion Behavior

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  • 酸化チタン顔料の酸量・塩基量の測定と分散挙動

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Acid and base amounts of four titanium dioxide pigments (Ti02-A, -B, -C, and -D) were estimated by a back titration method using bases and acids with various strengths. The dispersibility in acidic, neutral and basic acrylic resins was correlated to the acid and the base amounts of the pigments. For each pigment, acid amount was small, when it was analyzed by use of weak base. For two pigments (Ti02-C and -D), smaller base amount was detected by use of weak acids. On the other hand, base amount of two pimgments (Ti02-A and -B) was almost the same even though the acids of different strength was used. The gloss values of the dispersed pastes for the acidic an d the basic acrylic resins, which are regarded as indexes of dispersion, were higher than that for the neutral one if they were compared at the same dispersion time. The difference between the gloss valu es in the acidic and the neutral resins showed good correlation with the base amount of the pigments measured using acids having almost the same strength as the acid of resin. The same result was obtained for the gloss values in the basic and the neutral resins, and for the acid amounts of the pigmnets.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1993 (2), 145-150, 1993-02-10

    The Chemical Society of Japan

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