Journal of the Japan Society of Colour Material

Evaluation of Degradation Behavior of Protective Coatings by Scanning Acoustic Microscopy

M. MONSADA A., Y. SEKIYAMA, S. HAYASHI, M. YUASA, I. SEKINE, N. HIROSE ...

1999 Volume 72 Issue 4 Pages 209-217
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.209

JOURNAL FREE ACCESS

Show abstractHide abstract

The degradation behavior of a red pigmented long-alkyd resin paint (LAR) film on steel was investigated by scanning acoustic microscopy (SAM). Acoustic micrographs of coating film/steel interface essentially detected the development of degradation of the coating film after immersion in a 3% sodium chloride (NaCI) aqueous solution. The percentage of disbonded area of the coating film on steel was also determined. An increasing growth of disbonded area which initially appeared as blisters on the coating film was observed with the passage of time immersed in the NaCI solution. A good correlation between the percentage of disbonded area by the SAM and the coating film resistance (R_f) value by the electrochemical impedance spectroscopy (EIS) was obtained. The extent of disbonding of the LAR coating film on steel increased while the R_f value gradually decreased with increasing immersion time. Based on the results, the SAM was found to be essentially useful for the evaluation and monitoring of the degradation behavior of protective coating films on steel.

View full abstract

Download PDF (1325K)
Formation of Films and Photoimages of Pigments by Photoisomerization of Surfactants with a Spiropyran Moiety

Shunlin LIU, Soutaro BAN, Tetsuo SAJI

1999 Volume 72 Issue 4 Pages 218-227
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.218

JOURNAL FREE ACCESS

Show abstractHide abstract

Formations of films and photoimages of pigments by the photoisomerization of surfactants with a spiropyran moiety are examined. Surfactants containing a spiropyrane moiety (SPPEG) were synthesized. Blue film with a photoimage was prepared on a polyester plate by the illumination with UV light of a suspension containing SPPEG, β-type copper phthalocyanine (β-CuPc, C. I. Pigment Blue 15), and FeSO₄ under neutral or alkaline conditions. The resolution was of the order of 10, um. No film was formed without addition of FeSO₄. Blue (α-CuPc, C. I. Pigment Blue 15), red (C. I. Pigment Red 177), violet (C. I. Pigment Violet 23) and yellow (C. I. Pigment Yellow 55) films and photoimages were also obtained by a similar method. The critical micelle concentrations of SPPEG, the MC form and the complex of the MC form with Fe²⁺ were measured as were their adsorption isotherm on the pigment particles. The influences of the concentrations of the pigment, SPPEG and divalent metal, and pH on the film growth were discussed. The mechanism of the film formation was estimated as follows : The surfactants are isomerized to the MC form by UV illumination. The MC form forms a complex with Fe²⁺ ion which results in the loss of their amphiphilicity and desorption of the surfactant molecules from the pigment surface. Such a desorption of the surfactants leads to the deposition of pigment particles onto the substrate to form a film.

View full abstract

Download PDF (1412K)
Jet Ink Penetration into Papers Filled with Different Size of Silica Particles

Wei YU, Takayuki HORIE, Takeshi AMARI

1999 Volume 72 Issue 4 Pages 228-237
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.228

JOURNAL FREE ACCESS

Show abstractHide abstract

In this study, we investigated the ink penetration behavior into sized papers including silica particles having different size and discussed the relationship between the porous structure of paper and ink penetration behavior. Jet ink penetration behavior was investigated by measuring contact angle of jet ink droplet on sample paper. An aqueous dye jet ink and a pigment suspension jet ink were used in this study. From experimental results, it can be seen that in the paper matrix, the effective surface area of small particles for ink penetration seems to be greater than that of large particles and the smaller particles are apt to form inter-particle flow channels without any obstacles from paper fibers. Therefore ink wetting and penetration proceed more smoothly in the paper filled with the small particles. In the initial stage of the ink penetration, the disperse medium of the pigment suspension ink is quickly adsorbed into the small pores in porous silica particles, and hence the penetration of the pigment suspension ink is faster than that of the dye solution ink. On the other hand, in the longer time region, the penetration of the pigment ink is retarded because the pigments accumulate and block up the ink penetration channels.

View full abstract

Download PDF (1280K)
Surface Treatment of Organic Pigments

Koji NAKAWRA

1999 Volume 72 Issue 4 Pages 238-245
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.238

JOURNAL FREE ACCESS

Download PDF (1079K)
Application of Soft Chemistry to Layered Oxides

Nobuhiro KUMADA, Nobukazu KINOMURA

1999 Volume 72 Issue 4 Pages 246-251
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.246

JOURNAL FREE ACCESS

Download PDF (875K)
Estimation Method of Pigment Dispersion

Masaoki ISHIHARA

1999 Volume 72 Issue 4 Pages 252-261
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.252

JOURNAL FREE ACCESS

Download PDF (1374K)
Future Progress of Micronized Powder Coatings

Tatsuya KAWAMURA

1999 Volume 72 Issue 4 Pages 262-265
Published: April 20, 1999
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.72.262

JOURNAL FREE ACCESS

Download PDF (484K)

Register with J-STAGE for free!