Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 62, Issue 7
Displaying 1-5 of 5 articles from this issue
  • Hiroaki TADA, Yasuhiro SAITOH, Kunio MIYATA, Hideo KAWAHARA
    1989 Volume 62 Issue 7 Pages 399-403
    Published: July 20, 1989
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    In order to reduce the photocatalytic activity of rutile titania particles (TOP (R)), two methods of silica-coating onto them were attempted. The amount of Ag photodeposited onto the particles per unit area, which was defined as the value of z, was calculated as an indication of their photocatalytic activities.
    It was found that, when compared in the similar amount of silica-coatings, the z value of TOP (R) with silica-coatings prepared by a liquid phase deposition (LPD) method was approximately 0.1 times that by the general coating method. Transmission electron micrographs and the binding energy of Si2p electron of the coatings determined by X-ray photoelectron spectroscopy (XPS) suggest that the superior effect of the former on the suppression of the photocatalytic activity is ascribable to the characteristics of the coatings by the LPD method, which are uniformity and a dense structure.
    Download PDF (733K)
  • Shingo OKAMOTO
    1989 Volume 62 Issue 7 Pages 404-410
    Published: July 20, 1989
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    For the study of the photodegradation mechanism of acrylic paint films consisted of acrylate and methacrylate monomers, three kinds of acrylic resin have been synthesized from styrene, butyl acrylate, butyl methacrylate and hydroxyl methacrylate using three different kinds of initiator. The photodegradation process has been investigated by using ESR and FT-IR spectroscopies. It has been found from these results that in the initial photodegradation process of the paint film, -CH2C (COOR) CH2- radical is generated, which is followed by the formations of end-vinyl compound, tertiary alcohol and secondary amine.
    Acrylic resins consisted of same monomers and having different OH-values and molecular weights have been synthesized. Using these resins, the relationships between the concentration of the generated radicals from the films and the periods at which cracking began to, appear in the clear paint films by QUV test were also examined.
    As a result, the smaller the OH values and the larger the molecular wight, the generated radical concentration smaller and the cracking period longer.
    Download PDF (758K)
  • Masahiro TSUNOOKA
    1989 Volume 62 Issue 7 Pages 411-419
    Published: July 20, 1989
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Download PDF (938K)
  • Hirotoshi UMEMOTO
    1989 Volume 62 Issue 7 Pages 420-428
    Published: July 20, 1989
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Download PDF (963K)
  • Motoji TAKAHASHI
    1989 Volume 62 Issue 7 Pages 430-438
    Published: July 20, 1989
    Released on J-STAGE: November 20, 2012
    JOURNAL FREE ACCESS
    Download PDF (1568K)
feedback
Top