Journal of the Japan Society of Colour Material

A Contribution to the Studies on Viscoelastic Properties of Unsaturated Polyester Films

Iwao MOMIYAMA, Hiroshi IWAI, Shigeo MATSUZAKI

1970 Volume 43 Issue 9 Pages 427-432
Published: September 30, 1970
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.43.427

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Viscoelastic investigations were made regarding cracks during the thermocycle test (-20°C-+50°C) and a mat appearance after buff-polishing of unsaturated polyester films.
A study on the relation between viscoelastic moduli and film-defects gave some suggestions to improve unsaturated polyester coatings using.
Choosing the kinds of unsaturated polyester resins and cross-linking agents for experimental variables, dynamic moduli and loss moduli were obtained by the resonance frequency method and static moduli by stress-strain curves.
The results are as follows : for improuing the crack-resistance at the thermocycle test and to eliminate a mat appearance after buff-polishing, it is necessary to decrease the temperature-dependance of dynamic moduli or to minimize the difference in moduli depending on the fluctuation of temperature, to raise glass transition temperature and to increase the energy of destruction. At the same time, the shorter relaxation time gave better results.
To summerize, it is effective to make longer the molecular chain of polyester resins and to strengthen molecular interactions raising the degree of condensation and to increase the degree of cross-linking using polyfunctional monomers as cross-linking agents.

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The Heat of Immersion of Carbon Blacks

Noriyuki UCHINO, Kenjiro MEGURO

1970 Volume 43 Issue 9 Pages 433-437
Published: September 30, 1970
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.43.433

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The objectives of this paper were to correlate heat of immersion in water for several commercial carbon blacks with their surface properties and to investigate differences in the character of surface of various commercial carbon blacks. The heat values for commercial carbon blacks were found not only to depend upon interaction between basal graphite faces and wetting liquid, but to depend upon following items, (1) the kind and amount of functional groups on the surface of carbon black, (2) the amount of contaminations (ash, oil) on the surface, (3) the interaction of ash and oil as the contamination on the surface, and (4) the kind and amount of pelleting agents.

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Heat of Wetting of Metal Oxides

Tetsuo MORIMOTO

1970 Volume 43 Issue 9 Pages 438-447
Published: September 30, 1970
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.43.438

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Fundamentals for the Study of Heat of Immersion

Kenjiro MEGURO

1970 Volume 43 Issue 9 Pages 448-454
Published: September 30, 1970
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.43.448

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Experimental Techniques for the Measurment of Heat of Wetting

Kenichi MITATA

1970 Volume 43 Issue 9 Pages 455-460
Published: September 30, 1970
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.43.455

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Data of Heat of Immersion of Solid Powders

Hiroyoshi MURAYAMA, Kenjiro MEGURO

1970 Volume 43 Issue 9 Pages 461-467
Published: September 30, 1970
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.43.461

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