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 55, Issue 5
Displaying 1-6 of 6 articles from this issue
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  • Preparation of Organic Pigments with Metal Oxides as Core
    Synthesis of Sudan I on Esterified Silica Gel
    Mituru SUZUKI, Seisith ITO, Tosihide KUWAHARA
    1982 Volume 55 Issue 5 Pages 280-287
    Published: May 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.280
    JOURNAL FREE ACCESS
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    Red organic pigments with silica gel as core were prepared by deriving the surface silanols of the silica gel to structure similar to azo dyestuff, such as Sudan I (1-phenylazo-2-naphthol). The preparation method was as follows : The surface silanols of silica gel were esterified with aromatic alcohols or phenol (_??_-(CH2)n-OH;n=0, 1, 2, 3). The phenyl group introduced onto silica gel in this manner was nitrated, reduced, diazotized and coupled with 2-naphthol (as shown in Fig. 4).
    As a result, the produced samples had approximately the same color as Sudan I. The color became paler, when the methylene chain of the alcohol used for esterification was shorter. The sample with phenol had the most pale color. We presumed that the color was corresponding to the quantity of the surface group, which was synthesized on silica gel. The sample prepared with alcohol of longer methylene chain did not hydrolyze comparatively.
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  • Preparation of Transparent Iron Oxide Pigment using Hydrated Iron Oxide Sol prepared by Chemical Condensation Method.
    Seisirei ITO, Yasuharu UTUNOMIYA, Tosihide KUWAHARA
    1982 Volume 55 Issue 5 Pages 300-304
    Published: May 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.300
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • Recent Trends of Thermal Ink Transfer Recording
    Yoshikazu SHIMAZAKI
    1982 Volume 55 Issue 5 Pages 305-318
    Published: May 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.305
    JOURNAL FREE ACCESS
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  • The Method of Surface Analysis at Paint Industry
    Kyo TAKAOKA
    1982 Volume 55 Issue 5 Pages 319-327
    Published: May 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.319
    JOURNAL FREE ACCESS
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  • An Overview on the Pigments
    Isao KUMANO
    1982 Volume 55 Issue 5 Pages 328-339
    Published: May 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.328
    JOURNAL FREE ACCESS
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  • Pyrolysis of Silica Gels Treated with Alicyclic Alcohols-Comparison
    with the Pyrolysis of these Alcohols in Gaseous State or over Silica Gels
    Hiroshi UTSUGI, Atsushi ENDO, Noboru SUZUKI, [in Japanese], Motohiro Y ...
    1982 Volume 55 Issue 5 Pages 588-599
    Published: May 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.588
    JOURNAL FREE ACCESS
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    The thermal properties of surface group of silica gels treated with several alicyclic alcohols (C5, C6, C7, C6-C, C6-C2) were investigated through the analysis of their pyrolysis products in use of Gas Chromatograph-Quadru Pole Mass Spectrometer. These were compared with the pyrolysis of these alcohols in gaseous state or over silica gel. The pyrolysis of these alcohols in gaseous state takes place at 500-6O0°C and both dehydration and dehydrogenation proceed simultaneously. Since the pyrolysis over silica gels takes place at 300°C and water and corresponding alicyclic olefine were detected in the temperature range of 300° to 600°C, the silica gel was found to be catalyst to promote the dehydration of alcohols selectively. In higher temperature range, dehydrogenation takes place simultaneously like the case of gaseous state. Although the water and the corresponding alicyclic olefine were similarly observed for pyrolysis products of the surface-treated silica gels, the amount of water evolved in the temperature range of 300° to 600°C where the alicyclic olefine generates was observed to be small. As the ratio of the amount of water against that of alicyclic olefine were found to be constant against decomposition temperature in the pyrolysis of these alcohols over silica gel, these products could be noticed to be formed by the simple mechanism, i. e., dehydration of alcohol. Whilst these ratios showed to be parabolic in the pyrolysis of surface-treated silica gels. This indicates that the formation of water and alicyclic olefine would proceed by the different mechanism, i. e., dehydration due to condensation of unreacted silanol for water, whilst the mechanism like _??_SiOA→ _??_SiO+A→_??_SiOH+Ol (A, Alicyclic alcoxy group ; Ol, corresponding alicyclic olefine) for alicyclic olefine. Consequently, the surface groups were recognized not to be the species chemisorbed on substrate in the form of AOH, but to be the species bonded chemically with surface silanol like _??_SiOR.
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