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Volume 57, Issue 11
Displaying 1-4 of 4 articles from this issue
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Hatuzô MASUDA1984 Volume 57 Issue 11 Pages 591-596
Published: November 20, 1984
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSShrink properties and modulus of elasticity of thermosetting amino-alkyd resin coating were studied.
In the urea-melamine resin mixture system, shrinkage stress and shrinkage strain showed a maxium at 80% urea content and decreased with increase of the melamine resin content. This trend seems a synergistic effect of functional group in the melamine resin with acid catalyst in the urea resin. The modulus of elasticity showed a maximum at 100% urea resin content and decresaed curvilinearly with increase of the melamine resin content. This was caused by the effect of acid catalyst in the urea resin.
In the urea-soya bean fatty acid modified alkyd resin system, the modulus of elasticity increased with increase of the urea resin content. In the melamine-soya bean fatty acid modified alkyd resin system, it showed a maximum value in the vicinity of melamine : alkyd=50 : 50. In the melamine-castor oil modified alkyd resin system, it increased up to 30% alkyd resin content, but showed a saturated line by increasing beyond it.
In the urea-alkyd resin system, shrinkage stress showed a maximum at 80% urea resin content, but in the melamine-alkyd resin system, it showed a maximum in the vicinity of 60-70% urea con-tent. It was also shown that the shrinkage stress decreased in order of urea-soya bean fatty acid modified alkyd (hereafter referred as soya bean alkyd) >melamine-soya bean alkyd >melamine-castor oil modified alkyd (hereafter referred as castor oil alkyd).
Shrinkage strain of soya bean oil alkyd was almost the same as urea and melamine resins, but that of melamine-castor oilalkyd was slightly larger than that.
Further, the modulus of elasticity, shrinkage stress and shrinkage strain were also related with acid value.View full abstractDownload PDF (818K) -
Haruo KIRYU, Keiji HORIUCHI, Kozo SATO, Ju KUMANOTANI1984 Volume 57 Issue 11 Pages 597-601
Published: November 20, 1984
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe authors studied to confirm the microgel formation for the chain stopped alkyd resin modified with coconut fattyacid and soyabean fattyacid by means of GPC (Gel permeation chromatography), GPC-LS (Light scattering) and SEM (Scanning electron microscope).
The results were as follows : -
The microgel formation was confirmed from the exclusion porosity limit of the used column in GPC and SEM photograph of the cast film from its eluent solution. Here, the cast film was found to involve aggregates of microgels, major sizes of the aggregates being above several microns, responding exclusion porosity limit of the used column. Also, it was clear at glance, however, it became insoluble when it was once deposited from solution.
The microgel sizes varied and increased with increasing polarity or solubility parameter (s. p.) of eluent. They were more than 1 μm in tetrahydrofuran (s. p. 9. 52) and more than 10 μm in dimethyl-formamid (s. p. 12. 14).
Further, tracing of coconut fattyacid for chain stopped alkyd resin fraction during the resinous formation by GPC-LS suggested the microgel formation from the initial stage of reaction.View full abstractDownload PDF (594K) -
Seiji MATSUMOTO1984 Volume 57 Issue 11 Pages 602-609
Published: November 20, 1984
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2275K) -
Toyohiko YOSHIDA1984 Volume 57 Issue 11 Pages 610-617
Published: November 20, 1984
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (789K)
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