乾性油塗膜の黄変性試験法
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Authors carried out an accelerated test using filter paper for the determination of the yellowing of drying oils.<BR>A 40 X 40 mm square of Toyo No.3 filter paper was placed on a small wire support on the pan of an analytical balance and was weighed. Then about 100 mg of sample were placed in the center of the paper. The samples were 50% xylene solution of drying oils, and which contained Pb 0.4% and Co 0.05% dryer for the oil in the form of naphthenate. Then the unit was placed in a desiccator filled with nitrogen for about 1 hr. for the purpose of diffusing the sample over the surface of the paper. The filter paper film was then placed in a desiccator containing NaCl saturated aq. solution. The desiccator was then put in a forced draft oven kept at 50°C or 75°C. The amount of yellowing was determined by the difference in the absorbance measurements of reflectance (expressed as optical density) at some two different wave lengths, using a clean white filter paper as reference standard, which was measured once a day for 5 days (75°C) or 10 days (50°C) by spectrophotometer, Hitachi Model EPU-2 equipped with a reflectance accessory.<BR>For the determination of the two wave lengths most appropriate for the above purpose, authors measured the absorbance at 400 mμ, 440 mμ, 480 mμ, 520 mμ and 720 mμ. Then optical density was calculated as follows : <BR>Δoptical density (400-720) =optical density (400 mμ) -optical density (720 mμ) <BR>Δoptical density (400-720), (440-720), (480-720), (520-720) <BR>were then calculated. Δ optical density changes of each sample at 75°C and 50°C were plotted against time respectively. The yellowing order was given for each sample at each lapse of day from the results of above figures, of course the sample which had most large Δ optical density was ordered to the first. Then the order from each figures was compared to the observed yellowing order. As a result, it was found that the order from the figure of Δ optical density (440-720) showed most favorable agreement to the observed yellowing order.<BR>Influences of temperature, humidity and dryer for the yellowing of drying oils were discussed, applying this method.
- 色材協会の論文
色材協会 | 論文
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