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Volume 41, Issue 11
Displaying 1-6 of 6 articles from this issue
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Morio SUZUKI, Takeshi NOGUCHI1968 Volume 41 Issue 11 Pages 533-541
Published: November 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe correlation between the outdoor exposure and Dew-Cycle weather-ometer tests in terms of gloss retention and chalking was studied using white melaminealkyd enamels. Rutile titanias treated with varying amounts of ZnO, Al2O3 and SiO2 and a coconut-oil fatty acid modified alkyd resin were used to prepare the enamels. Chalking was first observed after about 100 hrs. in the unfiltered Dew-Cycle weather-ometer, corresponding to the outdoor exposures for about 10 months in Florida and 13 months in Okayama, Japan. The unfiltered test was found advantageous since chalking appeared some 8 times faster as compared with the filtered test. In general the correlation between the outdoor exposure and the Dew-Cycle weather-ometer tests was found excellent if the results were properly evaluated by the statistical methods.View full abstractDownload PDF (1745K) -
Minoru NAGAKURA, Yasuo OGAWA, Kazuhiko YOSHITOMI1968 Volume 41 Issue 11 Pages 542-553
Published: November 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe infrared spectroscopic method was applied to determine alkyd resin compositions with special emphasis on the identification of polyols and cyclic monobasic carboxylic acids. The presence of polyols such as propylene glycol (PG), glycerin (G), trimethylol ethane (TME), trimethylol propane (TMP) and pentaerythritol (PE) was detectable from the characteristic absorption band in 1500-136& 1350-1040 and 1000-900 cm-1 regions. Whether an alkyd resin was composed of polyols containing either primary OH (PG, G) or secondary OH (PE, TME, TMP) was determined from the absorption bands of primary and secondary OH groups. The former had absorptions at 1490, 1450, 1100,990 and 970 cm-1, and also at 1470 cm-1 as the shoulder of the 1450 cm-1 band, and the latter at 1470, and 970 cm-1, and at 1450 and 1490 cm-1 as the shoulders of 1470 cm-1 band. No absorption at 990 cm-1 was observed with the latter. TMP and TME alkyds had stronger absorption at 1380 cm-1 than at 1470 cm-1, with PE alkyds the situation was reversed. The PE/G weight ratio of the alkyds which were prepared from mixtures of these polyols keeping the oil length constant was proportional to the absorbance ratio D1200/D1090· The terminal OH groups had no effects on the 1100 and 1040 cm-1 bands, while this was not the case with castor oil modified alkyd resins.
Aromatic monobasic carboxylic acids such as benzoic acid and p-tert. butyl benzoic acid were detected from the absorptions of benzene ring substituents. The benzoic acid content was determined from D710/D748. In the case of soybean-oil fatty acid modified alkyd resin of 40% oil length, the benzoic acid content was obtaind from the equation,
X (X) % = (1/0. 0458) X, / (D710-0.513D748)
Since the extent of double bond isomerization of unsaturated fatty acid during the synthesis of alkyd resin was negligible, the geometric isomers of double bond in unsaturated fatty acid modified alkyd resin had no effects on the 990 (trans-trans conjugated) and 968 cm-1 (isolate trans) bands, except dehydrated castor-oil modified alkyd resin.View full abstractDownload PDF (1435K) -
The Determination of Zinc in Electrodeposited Film by Atomic Absorption SpectroscopyTatsuo SATO, Yoshiaki MOTOYAMA, Keiichi UCHIDA1968 Volume 41 Issue 11 Pages 554-559
Published: November 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSIt was reported in the previous paper that zinc in electrodeposited film can be determined quantitatively by means of atomic absorption spectroscopy. In this experiment, zinc in electrodeposited paint film was analyzed quantitavely by an Atomic Absoption Spectrosmeter to determine the relationship between the concentration of zinc in electrodeposited film and that in the electrodeposion paint. An acrylic resin emulsion and a water soluble alkyd resin solution were used.
It was found that the amount of zinc in electrodeposited film increased linearly with the increase in the concentration in paint and the ratio of them was 1 : 1, indicating that the concentration of zinc in paint does not increase during the continuous electropainting process. It was suggested that the velocity of electrophoresis of zinc is the same as that of the resin and that zinc is strongly bonded to the resin, probably to the carboxyl groups in the resin.
Ion exchange method was tested to remove the zinc in paint, and it was found that the concentration of zinc in paint decreased with the increas in the amount of cation exchange resin added and that zinc was removed completely by the use of enough cation exchange resin. It appears that zine can be removed more easily than amine by the cation exchanze resin.
The chemical structure of zinc present in the elecrodeposition paint was also discussed.View full abstractDownload PDF (824K) -
Yoshiaki MOTOYAMA, Yoshikazu NAKAJIMA, Tatsuo SAATO, Osamu OHE1968 Volume 41 Issue 11 Pages 560-562
Published: November 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESS -
Yoshiaki OYABU1968 Volume 41 Issue 11 Pages 563-569
Published: November 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (904K) -
Polymerization of Vinyl AcetateHiroshi KAKIUCHI1968 Volume 41 Issue 11 Pages 570-576
Published: November 30, 1968
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (861K)
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