Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 69, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • Evaluation for the dispersed state of magnetic paints containing Ba-ferrite fine particles by constant-pressure filtration method
    Masuo KUDO, Norio NAGASAKI, Toru MASUKO
    1996 Volume 69 Issue 2 Pages 83-89
    Published: February 20, 1996
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.69.83
    JOURNAL FREE ACCESS
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    Magnetic paints containing hexagonal-shaped barium-ferrite fine particles for magnetic recording media were prepared at various dispersing times. The dispersed state of the magnetic particles in the paints has been evaluated by the constant-pressure filtration method. In filtration tests under 2 kg/cm2 pressure with 1 μm-mesh filter, the total filtration volume increased with increasing dispersing time. This result implied that the magnetic particles dispersed better with increasing dispersion time. Each filtration data could be well-fitted to the theoretical trace of the standard blocking law by Grace. It was found that the size of agglomeration consisting of the magnetic particles was smaller than the filter mesh size, and the agglomeration caused the plugging at the inside of the filter. From the theoretical equation of the standard blocking law, we could obtain the plugging constants and maximum filtration volume, which showed a good agreement with the data from other evaluation methods for the dispersibility. Such parameters were useful indices for the evaluation of the quality of magnetic dispersion.
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  • Effect of Condensing Agents on the Grafting of Polymers onto Carbon Black Surface by the Reaction of Surface Carboxyl Groups with Hydroxyl-Terminated or Amino-Terminated Polymers
    Norio TSUBOKAWA, Junko KURUMADA
    1996 Volume 69 Issue 2 Pages 90-96
    Published: February 20, 1996
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.69.90
    JOURNAL FREE ACCESS
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    The effect of condensing agent on the grafting of polymers onto carbon black by the direct condensation of carboxyl groups on carbon black surface with terminal hydroxyl or amino groups of polymers was investigated. It was found that terminal hydroxyl or terminal amino groups of polymers successfully reacted with surface carboxyl groups on carbon black in the presence of condensing agents, such as thionyl chloride/N-methyl-2-pyrrolidone (NMP) system and thionyl chloride / pyridine system, to give the corresponding polymer-grafted carbon black : The percentage of grafting of hydroxyl-terminated poly (dimethylsiloxane) was determined to be 20. 6% at 70°C in the presence of thionyl chloride/NMP system. The grafting reaction was accelerated with increasing reaction temperature. The number of grafted polymer chain on the surface and the percentage of grafting were found to decrease with increasing molecular weight of polymers because of steric hindrance of grafted polymer chains. Polymer-grafted carbon black gave a stable colloidal dispersion in a good solvent for grafted polymer.
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  • Adsolubilization of 2-Naphthol into Quaternary Ammonium Cationic Surfactant Adsorbed Layer on Silica
    Kunio ESUMI, Mika MATOBA, Yoko YAMANAKA
    1996 Volume 69 Issue 2 Pages 97-101
    Published: February 20, 1996
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.69.97
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    Adsolubilization of 2-naphthol in quaternary ammonium cationic surfactants adsorbed layer on silica has been studied. Three surfactants (a single-chain, a double-chain, and a triple-chain) are used : dodecyltrimethyl ammonium chloride (DTAC), didodecyldimethyl ammonium bromide (DDAB), and tridodecylmethyl ammonium chloride (TMAC). Under a constant feed concentration of 2-naphthol, the adsolubilized amounts of 2-naphthol increase, reach a maximum and then decrease with DTAC or DDAB concentration, whereas only a slight decrease in the adsolubilized amount of 2-naphthol is observed for TMAC. It is shown that the maximum adsolubilized amount of 2-naphthol is in order of TMAC >DDAB> DTAC. A more direct evaluation by three surfactants is to calculate the ratio of amount of 2-naphthol adsolubilized to the adsorbed amount of surfactant on silica : the ratios for DDAB and TMAC are not so different and are considerably larger than that for DTAC.
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  • Mathematics of Experiments with Mixtures
    Asao MATSUYAMA
    1996 Volume 69 Issue 2 Pages 102-113
    Published: February 20, 1996
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.69.102
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    [in Japanese]
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  • Introduction to Understand Physical Properties of Coatings (VIII)
    Design for Coating System on Metal and inorganic Substrates (I)
    Keigo KINOSHITA, Minoru TSUBOTA
    1996 Volume 69 Issue 2 Pages 114-120
    Published: February 20, 1996
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.69.114
    JOURNAL FREE ACCESS
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  • Surface Design for Powder on Dry Process
    Dry Impact Blending Method
    Hirotaka HONDA, Futaba HONDA
    1996 Volume 69 Issue 2 Pages 121-126
    Published: February 20, 1996
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.69.121
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