科研之友
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摘要
The color of contaminants in used oils has not been investigated until recently. There are several good color standards. The CIExy coordinate, which is used in color engineering, is a popular color standard to locate a color of a product. The CIExy coordinate can be used for the colors of contaminants in used oil, but it is difficult to understand how the color is located in that position in the coordinate. The authors have developed a colorimetric patch analyzer (CPA) with the red-green-blue (RGB) color system to study the color of contaminants in used oils that were collected by membrane patches. The first CPA model examined the color of contaminants trapped on the surface of the membrane patches by reflected light similar to the currently available colorimetric analyzers. Some contaminants are soluble in working gas turbine oils at temperatures of 65 degrees C or higher but become insoluble in oils when the oils are cooled to room temperature for 24h. Therefore, the colors of contaminants differ according to oil temperature at the time of filtering through membrane filters. When the membrane patches through which hot turbine oils were filtered were examined with the light from the back, they showed light brown colors, although the color of the surfaces were white. This suggests that the membrane patch traps contaminants in the oil passages of the membrane patches when oil flows through the patches. The molecular weight of contaminants that are soluble in oil at high temperatures but not at room temperature was examined by gel permeation chromatography (GPC). The University of Fukui developed a state-of-the-art CPA that can examine the contaminants on the surface of membrane patches by reflected light and contaminants in the membrane patches by transmitted light.
- 出版日期2014-1-2
