Journal of the Japan Society of Colour Material

The Properties and the Analysis for Surface, Interface and Reformed Surface of Color Materials (IV)

Application of Neutron Activation Analysis to Studies of the Distribution of the Manganese Dryer in Alkyd Resin Paint.

Yasunori TARU, Kyo TAKAOKA

1986 Volume 59 Issue 10 Pages 583-586
Published: October 20, 1986
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.59.583

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Manganese dryer in the alkyd resin paint was measured by neutron activation analysis, and the distribution of the dryer from the surface to the inner portion of the paint film was examined.
The quantity of manganese ion was concentrated at the surface of the film, was kept constant at the inner portion, and was diluted in the neighborhood of the interface to the glass.
This phenomenon was remarkable for the paint contained much solvent.

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Determination of Tributyltin Compounds leached from Antifouling Paint by Gas Chromatography

Kazunobu TAKAHASHI, Takanori YOSHINO, Yoshihiko OHYAGI

1986 Volume 59 Issue 10 Pages 587-591
Published: October 20, 1986
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.59.587

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To obtain the content of tributyltin compounds leached from antifouling paint (A/F) into sea water, the determination of trace amounts of tributyltin chloride (TBTC) in sea water by gas chromatography equipped with electron capture detector (ECD-GC) have been studied.
Tributyltin compounds in sea water were converted to TBTC by hydrochloric acid. TBTC was extracted into hexane and measured by gas chromatography (ECD-GC). For the condition of gas chromatography, 10% Thermon-HG (60/80 mesh) on Chromosolb W column (3m×3mm i. d. : Stainless steel) was used and the column temp and the flow rate of N₂ were Sett up at 160°C and 60ml/min, respectively. The present method was well suited for the routine analysis of TBTC in sea water because the procedure was simple and the detection limit was about 0.3 ng. The percentage of recovery for the TBTC in sea water was 101% and the relative standard deviation (n=5) of TBTC (1.2μg/ml) was 3.3%.

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Physical Properties of Melamine Resin Cured Acrylic High Solids Coating Films (III)

Influences of functional group contents and molecular weight of oligomers

Toshihiko NAKAMICHI, Kishio SHIBATO

1986 Volume 59 Issue 10 Pages 592-599
Published: October 20, 1986
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.59.592

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A series of acrylic oligomers having different hydroxyl value (OHV) and molecular weight ladders with constant calculated T_g were cured with hexamethoxymethylmelamine (HMMM) in the presence of sulfonic acid catalyst at the mixing ratio of OH/OCH₃=1.0 (mole ratio). Dynamic viscoelastic properties and tensile properties of these clear coating films were measured.
Cross-link density, T_g and tan δ_max of cured films were analysed as a function of OHV and molecular weight or Q_E of acrylic oligomer, where Q_E is a fraction of free end group in acrylic oligomer molecule which should not been incorproated in the cross-linked networks. The regression equations which have extremely high correlation coefficients were obtained for these physical properties.
Young's modulus, tensile strength and elongation at break were also analysed as a function of cross-link density and molecular weight or Q_E of acrylic oligomer, and the regression equations which have considerably high correlation coefficients were obtained for these properties.
From these results, it has been found that the viscoelastic and tensile properties are clearly reflected by cross-link density and molecular weight. If the OHV and molecular weight or Q_E of acrylic oli-gomer were given, one can predict these physical properties. By the regression analysis, Q_E value indicated to be more correlative than the molecular weight.

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Rheological Studies on Curing Behavior of UV Inks (II)

Relationship between Cure Rate and Absorption Coefficient

Yasufumi OTSUBO, Takeshi AMARI, Koichiro WATANABE

1986 Volume 59 Issue 10 Pages 600-606
Published: October 20, 1986
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.59.600

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The dynamic viscosity of UV inks during curing was measured by the use of an oscillating plate rheometer. Since logarithmic plots of the dynamic viscosity against exposure energy are closely related by two straight lines, the minimum exposure energy defined as the exposure energy at the intersection of two lines is adopted to evaluate the cure rate. On exposure to a monochromatic light of 365 nm, the minimum exposure energy exponentially increases with film thickness. This is attributed to an exponential decay of the light intensity with depth in the film. Therefore, the absorption coefficient can be rheologically determined. The UV curability on direct exposure to UV lamp is predicted from the spectral sensitivity of the vehicle and the viscosity data obtained during curing under 365 nm light. The model calculation shows a good agreement with the experimental results.

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Sublimation of Dyes

Kenzo NISHIDA

1986 Volume 59 Issue 10 Pages 607-617
Published: October 20, 1986
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.59.607

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Funcfional Paints used for Thermal Controls

Shunichiro NISHIZAKI, Kozo SHIMAMOTO

1986 Volume 59 Issue 10 Pages 618-628
Published: October 20, 1986
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.59.618

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