All issues
Predecessor
Volume 41, Issue 7
Displaying 1-5 of 5 articles from this issue
- |<
- <
- 1
- >
- >|
-
Taichi TSURITANI1968 Volume 41 Issue 7 Pages 317-332
Published: July 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe flow properties of the pastes composed of finely-powdered calcium carbonate and vehicles with various with various degrees of polarity were studied. The vehicles studied were glycerol, paraffin oil and polymerized linseed-oil varnish and the calcium carbonate used were of ultrafine powder for printing ink, surface-treated with rosin or fatty acids. A spread-o-meter and a Laray viscometer were used to study the flow properties, particularly the dependence of flow curves on the load and shearing stress of the spred-o-meter. The extent of desorption of the previously absorbed material from the particle surfaces, the kinds of absorbed surfactant and the powder concentration all had pronounced effects on the shapes of flow curves. At the weight powder concentration of 50%, all the pastes behaved as non-Newtonian. In general the differential viscosity and yield value of the pastes containing the rosin-treated powder were lower than those of the pastes containing the fattyacid treated powder. The pastes composed of calcium carbonate and paraffin oil or glycerol did not flow in the spread-o-meter, but in the Laray viscometer they were non-Newtonian. In the latter viscometer the paste composed of the fatty-acid treated calcium carbonate and glycerol showed a remarkable dilatant flow behavior.
It is suggested that the particle-particle and particle-vehicle interactions as predicted by the Hamaker theory is the most important factor of the flow properties of the pastes.View full abstractDownload PDF (2096K) -
Manabu KIYONO, Masami NISHIHARA, Yutaka ÔTA1968 Volume 41 Issue 7 Pages 333-338
Published: July 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSTitanium dioxide pigments usually contain up to 0.5% of water soluble inorganic salts which consist of Na, SO4, K, Cl, etc. The effects of these ions on the electropainting process were studied. Of these only the acid ions, especially SO42-, exerted pronounced evil influences. Several rutile-type pigments with the same surface-treatments but with different levels of SO42- ion concentration were prepared. These pigments were dispersed in a water-soluble alkyd resin and an acrylic resin varnishes, and their electrodeposition properties were compared. The dissolved S042- ions accelerated the electrolysis of water during the electrodeposition process. Oxygen gas and sulfuric acid formed on anode produced pinholes in the electrodeposited film decreasing the gloss of the baked film, and accelerated the anodic dissolution of iron substrate. Ferric and ferrous ions thus produced were taken up by the electrodeposited film, giving brownish color and poor weathering resistance to the baked film. Soluble SO42- ions lowered the Coulomb efficiency of electrodeposition and thus the film thickness.View full abstractDownload PDF (812K) -
Nobumasa TATARA1968 Volume 41 Issue 7 Pages 339-344
Published: July 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESS -
Kyoichi SHIBAYAMA1968 Volume 41 Issue 7 Pages 345-351
Published: July 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1057K) -
Application Properties of Organic Pigments for Misoellaneous UsagesKiyoshi HASHIZUME1968 Volume 41 Issue 7 Pages 352-365
Published: July 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1548K)
- |<
- <
- 1
- >
- >|