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 8
Displaying 1-6 of 6 articles from this issue
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  • Thermal Stability and Mechanism of the Thermal Degradation of the Tarry Dyes for Food Additive
    Yasunori TARU, Kyo TAKAOKA
    1982 Volume 55 Issue 8 Pages 537-544
    Published: August 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.537
    JOURNAL FREE ACCESS
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    The thermal stability of the tarry dyes for food additives (sunset yellow FCF, erythrosine, fast green FCF and indigocarmine) was measured by thermal gravimetric analysis (abbreviation as TGA) and differential thermal analysis in air. Authors studied the thermal decomposition of these dyes by IR spectrum and elementary analysis.
    These dyes were decomposed through two or three stages (from 240°C to 600°C) by TGA, and the color of the dyes changed in the first stage.
    The sunset yellow FCF decomposed through the two stages (320-590°C) by TGA. The decomposition of the azo group and the release of hydrogen from the O-H bond occurred in the first stage (320 450°C).
    The erythrosine decomposed through the three stages (240-8O0°C) by TGA. Carbocyclic ketone of the dye was decomposed in the first stage (240-360°C) and NaI was obtained in the second stage (360-450°C).
    The fast green FCF decomposed through the three stages (240-580°C) by TGA. The release of the ethyl group and a part of nitrogen atom in the dye occurred in the first stage (240-300°C), and isocyanate compound was obtained in the second stage (310-430°C).
    The indigocarmine decomposed through the three stages (340-550°C) by TGA. The heterocyclic ring of this dye decomposed in the first stage (340-470°C).
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  • Pigments Dispersion in Aqueous Solution by Acrylic Oligomer Surfactants and Sodium Dodecyl Sulfat
    Kimihiko OGIHARA, Sadayuki TOMIOKA, Kumio ESUMI, Kenjiro MEGURO
    1982 Volume 55 Issue 8 Pages 546-552
    Published: August 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.546
    JOURNAL FREE ACCESS
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    The oligomer type surfactants were prepared by cooligomerization with acrylic acid and acrylonitrile. The effect of the oligomer type surfactants and sodium dodecyl sulfate (SDS) as an anionic type surfactant upon the dispersion of TiO2 and α-Fe2O3 in aqueous solution was evaluated by particle size distribution analysis and ζ-potential measurement. The particles of TiO2 dispersed by AlCl3 and of α-Fe2O3 dispersed by FeCl3 flocculated by addition of small amount of the oligomers and SDS, then the flocks redispersed by further addition of the oligomers and SDS. It was found that (1) flocculation and redispersion processes were observed in a lower concentration range in the case of the oligomers than in the case of SDS and that (2) oligomers gave higher ζ-potential to the pigment particles than SDS. Furthermore, both the flocculation process and the redispersion one were observed in lower concentration range in the case of the oligomer with higher ratio of cylic acid unit. This result means that the dispersing action of the oligomers depends on the number of acrylic acid unit of the oligomer molecule.
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  • Determination of Lead in Anticorrosive Coatings by Atomic Absorption Spectrophotometry
    Kazunobu TAKAHASHI, Shuichi MINAMI, Mitsuru SHIGEMATSU, Yoshihiko OHYA ...
    1982 Volume 55 Issue 8 Pages 553-557
    Published: August 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.553
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • The Cracking of Coatings Films
    Kozo SATO
    1982 Volume 55 Issue 8 Pages 558-569
    Published: August 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.558
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  • International System of Units (SI) in Coatings Field
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1982 Volume 55 Issue 8 Pages 570-589
    Published: August 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.570
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  • Inorganic Pigments (Section 2) -Colored Pigments-
    Katsuhiko MATSUURA
    1982 Volume 55 Issue 8 Pages 590-599
    Published: August 20, 1982
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.55.590
    JOURNAL FREE ACCESS
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