Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 92 , Issue 8
Showing 1-4 articles out of 4 articles from the selected issue
Integrated Paper
    2019 Volume 92 Issue 8 Pages 213-219
    Published: August 20, 2019
    Released: November 02, 2019

    In order to clarify the dispersion state of ultra-fine pigment particles in the process of making inks, Small-Angle-X-ray-Scattering (SAXS) and Ultra-Small-Angle-X-ray-Scattering (USAXS) analyses were performed at SPring-8, one of the largest facilities of synchrotron radiation. The samples of pigment ink dispersions were composed of ultra-fine pigment, dispersant, binder, and solvent. We found that the SAXS/USAXS profiles of inks, especially the presence or absence of shoulders in the profiles indicate the different dispersion states of the pigments. From the obtained data we deduce that to achieve higher dispersion stability of the pigment particles for higher-performance ink products, it is necessary not only to elaborately modify the pigment interface by optimizing the type and amount of the dispersant agents, but also to stabilize the inks by blending with appropriate amounts of binder.

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Serial Lecture
  • Yoichiro BEKKI
    2019 Volume 92 Issue 8 Pages 225-231
    Published: August 20, 2019
    Released: November 02, 2019

    At present, CO2 emissions reduction is a major social goal, and the fuel consumption regulations of automobiles in each country are becoming increasingly strict. In order to improve the fuel efficiency of automobiles, weight reduction is effective, and the need for lightweight materials is increasing more and more. There are high-tensile steel, CFRP, magnesium alloy, aluminum alloy, etc. as materials for weight reduction, among them, the application of aluminum materials excellent in the balance of weight reduction effect and cost has been rapidly increasing.

    In this report, we introduce the properties required for aluminum materials for automobiles and material development corresponding to them, and then touch on surface treatment technology and bonding technology for automobile.

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Serial Lecture