三羟甲基丙烷复合酯与季戊四醇复合酯热氧化性能对比研究
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摘要
实验研究了两种复合酯在不同条件下氧化后黏度、黏度指数和酸值的变化规律,并对黏度与时间、酸值与时间以及酸值与黏度的关系进行曲线拟合。同时,通过红外光谱分析了两种油品氧化前后分子结构的变化。结果显示:两种复合酯在氧化过程中均能够保持较高的黏度指数和结构稳定性,并且酸值变化函数的拟合参数较为接近,但季戊四醇复合酯的黏度对高温更加敏感,变化速率更快。
The trimethylolpropane complex ester and pentaerythritol complex ester were oxidized by the oven at different temperatures and time. Then the kinematic viscosities, viscosity indexes and acid values of oxidized esters were tested respectively. The change rules of values with temperature and time were obtained by fitting function.Meanwhile, the relationship between kinematic viscosities and acid values were researched by fitting function.Additionally, the changes of molecular structure before and after isothermal oxidation were analyzed by infrared spectroscopy. Results showed that, the two esters kept high viscosity index and structure stability during oxidation process. The parameters of acid value change functions of two esters were close, while the viscosity of pentaerythritol complex ester was more sensitive to high temperature and increased more quickly.
The trimethylolpropane complex ester and pentaerythritol complex ester were oxidized by the oven at different temperatures and time. Then the kinematic viscosities, viscosity indexes and acid values of oxidized esters were tested respectively. The change rules of values with temperature and time were obtained by fitting function.Meanwhile, the relationship between kinematic viscosities and acid values were researched by fitting function.Additionally, the changes of molecular structure before and after isothermal oxidation were analyzed by infrared spectroscopy. Results showed that, the two esters kept high viscosity index and structure stability during oxidation process. The parameters of acid value change functions of two esters were close, while the viscosity of pentaerythritol complex ester was more sensitive to high temperature and increased more quickly.
引文
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[3]李雁秋,王鹏,张宜涛,等. R22型空调压缩机专用冷冻机油的研制[J].石油商技,2012,4:28–31.
[4]姜会泽,费逸伟,姚婷,苄森.酯类润滑油的结构对性能影响研究[J].当代化工,2015,44(7):1570-1572.
[5]陈美名,宗明.用于R134a和R22制冷系统的合成冷冻机油研究[J].石油炼制与化工,2011,42(8):69-73.
[6]Leslie R R, Ronald L S. Synthetic lubricants and high–performance functional fluids[M].北京:中国石化出版社, 2006:53–81.
[7]李涛,李强,阚杰,等.润滑油对制冷系统的影响[J].制冷与空调,2005,5(4):75–78.
[8]费建奇,赵伟.多元醇酯类冷冻机油用基础油的合成及其性能[J].润滑油,2009,08(24)4:2–25.
[9]郝敬团,郭力,孙士安,佟丽萍.影响双酯乳化油酸值变化的因素研究[J].当代化工,2015,44(11):2566–2568.
[10]陈立波,郭绍辉.酯类合成油的热氧化及其状态监控技术研究进展[J].合成润滑材料,2001,28(2):19–23.
[11]Mannekote J K, Kailas S V. The effect of oxidation on tribological performance of few vegetable oils[J]. Journal of Materials Research and Technology,2012,1(2):91–95.
[12]金永亮,钱绪政,向亚玲,等.三羟甲基丙烷油酸酯基础油热氧化规律研究[J].润滑与密封,2014,39(12):39–42.
[13]刘建芳,金永亮,向亚玲,等.酯类基础油的热氧化与水解稳定性能研究[J].润滑与密封,2014,39(5):56–61.
[14]何少炜,郑哲.季戊四醇润滑油的水解安定性研究[J].当代化工,2016,45(5):890–896.
[15]马海红,李维民,马瑞,王晓波.合成酯类基础油的水解稳定性研究[J].润滑与密封,2016,41(5):53-58.
[16]Thomas F B, Moore R G, Bennion D W. Kinetic parameters for the high-temperature oxidation of in-situ combustion coke[J]. Journal of Canadian Petroleum Tcchnology,1985,24(60):60–67.
[17]Jumat S, Nadia S, Emad Y. Improvement of pour point and oxidative stability of synthetic ester basestocks for biolubricant applications[J].Arabian Journal of Chemistry, 2012,5:193–200.