Enhancement of Dispersion and Fluidity of Aqueous Carbon Slurry by Addition of Various Dispersants

Seizo OBATA; Hiroyuki ASAKURA; Hiroshi ASANO; Osamu SAKURADA; Minoru HASHIBA; Tadashi SHIMADA

doi:10.14852/jcersjsuppl.112.0.S187.0

Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue

Session ID : 2

DOI https://doi.org/10.14852/jcersjsuppl.112.0.S187.0

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Host: The Ceramic Society of Japan

Co-host: Iketani Science and Technology Foundation, International Ceramic Federation, Commemorative Organization for the Japan World Exposition '70, The American Ceramic Society, The Australasian Ceramic Society, The Chinese Ceramic Society, The Korean Ceramic Society, Joint Research Consortium of Synergy Ceramics/Fine Ceramics Research Association, Nanotechnology Researchers Network Center of Japan, The Special Coordination Funds for Promoting Science and Technology, Japan National Tourist Organization, Aichi Prefectural Government, CASIO SCIENCE PROMOTION FOUNDATION, DAIKO FOUNDATION, Nagoya Convention and Visitors Bureau, The Asahi Glass Foundation, The Kao Foundation For Arts And Sciences, The Murata Science Foundation, The Ogasawara Foundation for the Promotion of Science & Engineering, ASAHI GLASS CO., LTD. Research Center, CENTRAL GLASS CO., LTD., ELECTRIC GLASS INDUSTRY ASSOCIATION OF JAPAN (EGAJ), Hattori Company, Ltd., Hitachi Research Laboratory, Hitachi, Ltd., HOYA CORPORATION, INAX Corporation, ITOCHU CERATECH CORP., Japan Cement Association, KYOCERA Corporation, KYUSHU REFRACTORIES CO., LTD., MINO CERAMIC CO., LTD., Murata Manufacturing Co., Ltd., NGK INSULATORS LTD., NGK SPARK PLUG CO., LTD., NICHIAS Corporation, NIKKO COMPANY, Nippon Electric Glass Co., Ltd., Nippon Sheet Glass Co., Ltd., NORITAKE CO., LIMITED, Tokuyama Corporation, TOTO LTD.

Papers

Enhancement of Dispersion and Fluidity of Aqueous Carbon Slurry by Addition of Various Dispersants

Seizo OBATA, Hiroyuki ASAKURA, Hiroshi ASANO, Osamu SAKURADA, Minoru HASHIBA, Tadashi SHIMADA

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Keywords: Carbon, Aqueous slurry, Dispersion, Fluidity, Dispersant, Zeta potential

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Abstract

The dispersion and fluidity of aqueous carbon slurries were studied to elucidate the optimum preparation conditions to obtain well-dispersed and fluidized aqueous carbon slurries. The mean particle diameter of the carbon powder used was 13 nm. Styrene/maleic copolymer (SM), polystyrenesulfonic acid (HPSS), and naphthalene sulfonic acid formalin condensate ammonium salts (DEMOL-AS) were selected as dispersants. The rheological behavior of aqueous carbon slurries with various dispersants was examined and evaluated. The electrokinetic behavior of the carbon particles in the presence of DEMOL-AS, SM, or HPSS indicated that the surface properties of the carbon particles changed from hydrophobic to hydrophilic by adsorption of dispersants. The fluidity of aqueous carbon slurries was effectively enhanced by the addition of DEMOL-AS, as compared with the addition of SM or HPSS. DEMOL-AS containing a naphthalene nucleus was an effective dispersant to improve the surface of carbon particles. The dispersion and fluidity of the carbon slurries were dependent on electrokinetic and steric interactions. The carbon slurries with DEMOL-AS were well dispersed and fluidized over a wide range of pH. These observations indicated that DEMOL-AS is an effective dispersant for preparing aqueous carbon slurries.

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