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Volume 60, Issue 1
Displaying 1-6 of 6 articles from this issue
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Brilliant Blue FCF LakesYasushi KUBO, Tomohiko IIJIMA1987 Volume 60 Issue 1 Pages 2-13
Published: January 20, 1987
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSBrilliant Blue FCF aluminum lakes were prepared by dyeing aluminum chloride hydroxide substrate gels which were precipitated from an aluminum chloride solution by sodium hydroxide. Examinations were made on the effect of the substrate-precipitating pH, dye content and drying temperature on the composition and anti-eluting strength of the resulting lakes.
The feature observed on dye elution curves in 1% NaCl solution was of the dye-saturated type for all of the lakes prepared with dye anion contents ranging from 14.7 to 37.8%, where the eluted dye concentration was equilibrated with the dye concentration in the peripheral zone of lake particle. The fact that the unsaturated stage was not found in the dye elution feature was quite different from the Tartrazine, Sunset Yellow FCF and Indigo Carmine lakes as reported previously.
Dried lakes liberated Cl ions along with Al ions more than one third molar ratio to Cl ions by extraction with pure water at room temperature. The amount of water-extractable Al salts was larger as the substrate-precipitating pH was lower, as the dye content of the lakes was larger and as the drying temperature was higher.
Comparison of the anti-eluting strength using the KCD value (CD; dye content in the lake) was proposed, which would be more practical than using the K value (K; distribution coefficient of the dye anion). The lake specimens obtained in this study were stronger by three times in the anti-eluting strength than the most excellent brand of commercially available lakes.View full abstractDownload PDF (1100K) -
Toshihiko NAKAMICHI1987 Volume 60 Issue 1 Pages 14-24
Published: January 20, 1987
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSUV-condensation appratus (UVC method : ASTM G53-77) was studied to accelerate the evaluation time of cracking on clear coatings in two-coat type metallic coatings consisted of various acrylic resins. Shorter cracking time by UVC method (tuvc) compared with the cracking time by sunshine weathermeter (tss) was observed when the cycle of UV irradiation at 70°C for 8 hours and condensation at 40°C for 4 hours was used, and the correlation of cracking times in hours between the two methods is obtained as follows :
tuvc=23.0√tss
From the physical property measurements of clear coatings during the degradation, it is concluded that cross-linking reaction predominantly occurs in the styrene copolymerized resin systems and main chain scission predominantly occurs in the methyl methacrylate copolymerized systems. Also the addition effect of ultra-violet absorber and hindered amine light stabilizer was evaluated by means of physical properties change of clear coatings during the UVC exposure.View full abstractDownload PDF (1762K) -
Keizo OHTA1987 Volume 60 Issue 1 Pages 25-30
Published: January 20, 1987
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (808K) -
Masumi KOISHI1987 Volume 60 Issue 1 Pages 31-35
Published: January 20, 1987
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1342K) -
Finding what is behind the FactsIchiro TAKETANI1987 Volume 60 Issue 1 Pages 36-43
Published: January 20, 1987
Released on J-STAGE: November 20, 2012
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Magnetic Paint and CoatingHiroshi HOSAKA1987 Volume 60 Issue 1 Pages 44-53
Published: January 20, 1987
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1691K)
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