金属存在下聚α-烯烃基础油热氧化衰变性能结构对比分析
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摘要
借助高温氧化模拟加速装置,模拟金属存在下聚α-烯烃(PAO)航空润滑油基础油高温工作环境,对比分析添加金属Cu前后油样的外观、黏度和酸值变化,利用GC/MS检测不同温度下油样的微观组成,并根据物质结构分析PAO理化性能变化的原因。结果表明:金属Cu加速了PAO的高温裂解,产生了某些生色化合物,加速了油品的氧化变质,使油品黏度降低,并生成了酸性物质使油品酸值增加;GC/MS分析结果表明,金属Cu的存在会加速PAO的氧化和裂解,产生碳数更少的烃分子,也促进含双键的不饱和烃、含氧化合物等物质的生成,在宏观上使油样运动黏度降低、酸值增大和颜色加深。
By means of high temperature thermal oxidation accelerated simulator,the high-temperature operating environment of PAO aviation lubricating oil in the presence of copper was simulated,and the variation of appearance,viscosity and acid value of PAO was analyzed before and after adding copper by contrast. The micro composition of samples under different temperature was detected by GC/MS,and the reason of the physical and chemical properties changes of PAO was analyzed according to the material structure.The result show that the high temperature cracking of PAO is accelerated in the presence of copper,some chromophores are produced,which accelerate the oxidation deterioration of PAO and make oil products kinematic viscosity reduced.The formation of acidic material results in the increasing of the acid value of PAO.The analysis results of GC/MS show that,the presence of copper will accelerate the oxidation and cracking of PAO,promote the formation of hydrocarbon molecules with less carbon number,and the substances such as unsaturated hydrocarbon containing double bonds and oxy-compounds.So the viscosity of the oil sample is decreased,the acid value is increased and the color is deepened.
By means of high temperature thermal oxidation accelerated simulator,the high-temperature operating environment of PAO aviation lubricating oil in the presence of copper was simulated,and the variation of appearance,viscosity and acid value of PAO was analyzed before and after adding copper by contrast. The micro composition of samples under different temperature was detected by GC/MS,and the reason of the physical and chemical properties changes of PAO was analyzed according to the material structure.The result show that the high temperature cracking of PAO is accelerated in the presence of copper,some chromophores are produced,which accelerate the oxidation deterioration of PAO and make oil products kinematic viscosity reduced.The formation of acidic material results in the increasing of the acid value of PAO.The analysis results of GC/MS show that,the presence of copper will accelerate the oxidation and cracking of PAO,promote the formation of hydrocarbon molecules with less carbon number,and the substances such as unsaturated hydrocarbon containing double bonds and oxy-compounds.So the viscosity of the oil sample is decreased,the acid value is increased and the color is deepened.
引文
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[3]BRAJENDRA K.SHARMA,ARTHUR J.STIPANOVIC.Development of a new oxidation stability test method for lubricating oils using high-pressure differential scanning calorimetry[J].Thermochimica Acta,2003,402:1-18.
[4]MURILO T F,BRENO S LUNA,ESTELIO M ROCHA,et al.Assessment of biodegradability and oxidation stability of mineral,vegetable and synthetic oil samples[J].Industrial Crops and Products,2011,33:579-583.
[5]程治升,费逸伟,杨宏伟,等.聚α-烯烃的高温氧化衰变过程及评价方法[J].合成润滑材料,2013,40(2):36-39.CHENG Z S,FEI Y W,YANG H W,et al.The oxidation decay process at elevated temperature and evaluating method of poly-α-olefins[J].Synthetic Lubricants,2013,40(2):36-39.
[6]费逸伟,郭峰,姚婷,等.聚α-烯烃航空润滑基础油高温氧化衰变机理研究[J].西安石油大学学报,2015,39(2):98-102.FEI Y W,GUO F,YAO T,et al.Mechanism on pyrolysis of polyα-olefin aviation lubricating base fluid[J].Journal of Xi’an Shiyou University,2015,30(2):98-102.
[7]费逸伟,彭兴隆,姚婷,等.聚α-烯烃航空润滑油基础油超高温产物结构组分分析[J].河南师范大学学报(自然科学版),2014,42(5):92-98.FEI Y W,PENG X L,YAO T,et al.Analyzing compounds in poly-alpha-olefins aviation lubricating basic oils under ultra-high temperature[J].Journal of Henan Normal University(Natural Science Edition),2014,42(5):92-98.
[8]费逸伟,郭青鹏,姚婷,等.聚α-烯烃航空润滑基础油高温裂解衰变研究[J].化工时刊,2014,28(6):22-25.FEI Y W,GUO Q P,YAO T,et al.Research on the thermal cracking decay of polyα-olefin aviation lubricating oil[J].Chemical Industry Times,2014,28(6):22-25.
[9]姚婷,马玉红,郝敬团,等.温度对聚α-烯烃和双酯理化性能的影响[J].合成润滑材料,2014,41(4):8-11.YAO T,MA Y H,HAO J T,et al.Effect of temperature on physicochemical properties to paos and diesters[J].Synthetic Lubricants,2014,41(4):8-11.
[10]李勇.某型航空发动机润滑系统故障诊断的研究[D].武汉:武汉理工大学,2010.
[11]SINGH A,GANDRA R T,SCHNEIDER E W,et al.Lubricant degradation and related wear of a steel pin in lubricated sliding against a steel disc[J].ACS Applied Materials&Interfaces,2011,3(7):2512-2521.