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 54, Issue 9
Displaying 1-5 of 5 articles from this issue
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  • Oxidization Treatment of Carbon Black by Low Temperature Oxygen Plasma
    Tatuhiko IHARA, Seisirô IRÔ, Tosihide KUWAHARA, Mitsuo KIB ...
    1981 Volume 54 Issue 9 Pages 531-536
    Published: September 20, 1981
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.54.531
    JOURNAL FREE ACCESS
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    Oxidization of carbon black was carried out by low temperature oxygen plasma, in order to improve the dispersibility of carbon black in water. Also changes of surface properties and the improvement of dispersibility in water by this treatment were investigated. Surface acidity of carbon black increased and pH as the parameter of this surface acidity shifted toward acid side by this treatment. The degree of this increase in surface acidity became greater as the high-frequency power was lowered. This tendency appeared notably in the case of Mitsubishi # 44 (furnace type). The degree of an increase in strong acidity was much greater than that in weak acidity in this treatment. The wettability and dispersibility in water were improved by this treatment, but low high-frequency power (2W) was found to be much effective for oxidization of carbon black in this method.
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  • Studies on the Spitting Problem of PVC Plastisols on the Knife Coating
    Shigehiko OIKAWA, Eitaro NAKAMURA, Nobuhide HADA
    1981 Volume 54 Issue 9 Pages 537-545
    Published: September 20, 1981
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.54.537
    JOURNAL FREE ACCESS
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    The spitting problem of PVC plastisols on the knife coating is well-known but still remains to be elucidated.
    Effects of plastisol compositions on the spitting together with the correlations between viscosities of the plastisols and the spitting were studied.
    Simplified plastisols which consist of PVC resin (s) and a plasticizer were prepared at solid volume fraction (PVC fraction) of 0.505-0.613. Viscosities at the shears from 1 sec-1 to 103 sec-1 were measured with Rotovisco double cylinder, cone-and-plate systems and Brookfield type viscometers. The spitting behavior was observed with a miniature knife coating tester under accelerated conditions. Four kinds of PVC resins and seven kinds of plasticizers were employed to examine the effect of plastisol composition on the spitting and plastisol viscosities. Also, the coating velocity was varied.
    To avoid unfavorable spitting, low viscosity of the plastisols and low solid volume fraction are desirable in general. Care must be taken when low viscosity plasticizers such as DOA, DBS are formulated, because the spitting is liable to develop in spite of their low viscosity properties. At higher coating velocities, the plastisol viscosities should be reduced roughly inversely proportional to coating velocity.
    It was found that the rheological dilatancy was not essential to the spitting problem.
    Vicosities at about 10 sec-1 and Casson K1 values estimated from viscosities at 1-10 sec-1 have closer relation to spitting behavior than the viscosities at shear rate (about 103 sec-1) calculated from coating velocity and clearance.
    These results suggest that the spitting problem is related to the transition of particle flow pattern form stable layer to unstable dilatant in plastisol.
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  • The Present and Future of Online Information Retrieval with Emphasis on DIALOG System
    Osamu HARA
    1981 Volume 54 Issue 9 Pages 546-559
    Published: September 20, 1981
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.54.546
    JOURNAL FREE ACCESS
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  • Online Information Retrieval in Chemistry
    Akiko MOTOYAMA
    1981 Volume 54 Issue 9 Pages 560-569
    Published: September 20, 1981
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.54.560
    JOURNAL FREE ACCESS
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  • Pretreatment for Painting and It's Role in Corrosion Protection of Coating System
    Yuichi YOSHIDA
    1981 Volume 54 Issue 9 Pages 570-582
    Published: September 20, 1981
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.54.570
    JOURNAL FREE ACCESS
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