【摘 要】
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The feasibility of measuring the low concentrations of phenolic and amine antioxidants in ester oils has been researched by using near-infrared and mid-infrared spectroscopy. The phenolic antioxidant
【机 构】
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State Key Laboratory of Special Surface Protection Materials and Application Technology, Wuhan Resea
【出 处】
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第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
The feasibility of measuring the low concentrations of phenolic and amine antioxidants in ester oils has been researched by using near-infrared and mid-infrared spectroscopy. The phenolic antioxidant 2, 6-di-tert-butyl-4-methylphenol (T501) was added into trimethylolpropane trioleate (TMPTO) base oil and the TMPTO containing dinonyl dianiline (T558) was prepared as well. The mass concentrations of two kinds of samples were 0.2%, 0.5%, 1.0% and 2.0%. The O-H of T501 and N-H of T558 were the functional groups that have antioxidative effect in their molecular structures. The absorptivity values of the first overtone bands of O-H and N-H stretching vibrations were tested by near-infrared spectroscopy, and the absorbances of O-H and N-H stretching vibrations were measured by mid-infrared spectroscopy. The relationships of spectrum peak intensities of O-H and N-H groups and the mass concentrations of T501 and T558 antioxidants were obtained. The results show that, the proportional function is confirmed between the absorptivity value of the first overtone of O-H stretching vibration of T501 and the mass concentration. The peak intensity of N-H stretching vibration of T558 is weak which has no linear relationship with the concentration of T558. The low concentration of T501 can be determined quantitatively by near-infrared spectroscopy analysis. In the mid-infrared spectroscopy analysis, the proportional function of absorbance peak intensity of O-H stretching vibration and the mass concentration of T501 as well as N-H of T558 antioxidant can be obtained, and the low concentration of T501 or T558 in lubricants can be tested by utilizing near-infrared and mid-infrared spectroscopic methods.
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