Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 94 , Issue 1
Showing 1-4 articles out of 4 articles from the selected issue
Review
  • Noboru SUZUKI
    2021 Volume 94 Issue 1 Pages 2-8
    Published: January 20, 2021
    Released: January 28, 2021
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    There are many methods for the surface-modification of powder materials to get the high functionality, such as fluidity, dispersibility, and so on. Commonly used coupling agents react with the surface functional group, especially hydroxyl group, through the formation of chemical bonds, and also the many techniques are applied according to the chemical properties of those agents and the powders. In this paper, our research results of some modification techniques using mainly alcohols and silane coupling agents and the surface characterization methods are described including the historical context.

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  • Kazuyuki TACHI
    2021 Volume 94 Issue 1 Pages 9-16
    Published: January 20, 2021
    Released: January 28, 2021
    JOURNALS RESTRICTED ACCESS

    Transfer efficiencies of air spraying and electrostatic rotary-bell spraying have been simulated using a 2-dimensional model and a motion equation. The orbits of paint droplets with various diameters near the substrate were calculated from measured specific charge, droplet velocity, air velocity, and so on. The transfer efficiency was estimated as the ratio of nonvolatile weight of droplets arrived at the substrate to that of all droplets.

    To increase the transfer efficiency in terms of practical use, optimization of atomization, increase in specific charge and/or electric field, and narrowing of spray pattern where necessary are effective.

    Though inkjet coating is expected as the coating technology of 100% transfer efficiency, it will be impossible to substitute it for electrostatic rotary-bell spraying in the painting process of car bodies, unless the productivity (coated area per time) is improved drastically.

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Serial Lecture
Serial Lecture
  • How to Grasp the Nature of Mixture Solutions by Simple NMR Measurement
    Tadashi NEMOTO
    2021 Volume 94 Issue 1 Pages 22-26
    Published: January 20, 2021
    Released: January 28, 2021
    JOURNALS RESTRICTED ACCESS

    The NMR-metabolic profiling (MP) methodology, a combination of 1-D 1H-NMR measurement and statistical pattern recognition, is a very powerful and forthright approach for mixture solution analysis. It can skip purification process to get a target compound, or even sample preparation. It also may omit detailed analysis of each spectrum. Consequent exploratory analysis by removing key variable(s) with step by step manner, and/or by adding/removing numeric sample data from data set could suggest useful information to understand complex situation.

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