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Study on Preparation and Properties of Grease Based on Ultrafine Bentonite Powder

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China Petroleum Processing & Petrochemical Technology 2016年第2期18卷 108-114页

作者： Wang Jing Guo Xiaochuan Jiang Mingjun He Yan department of Military oil application & management engineering Logistical Engineering University

The feasibility for preparation of ultrafine bentonite powder by different milling methods was studied. And the comparison of comprehensive performance between ultrafine bentonite grease and traditional bentonite grease was also investigated. The results indicated that the statistic Z-average size of ultrafine bentonite prepared by sand milling was 250 nm with a narrow size distribution and the lattice structure of ultrafine bentonite maintained good character despite a slight distortion occasioned. The mechanical stability, colloid stability, antiwear ability and friction-reducing property of ultrafine bentonite grease were superior to the traditional one.

关键词： ultrafine bentonite preparation grease mechanical stability tribology

Improvement of Magnetic Field on Tribological Properties of Lubricating oils with Zinc Butyloctyldithiophosphate

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China Petroleum Processing & Petrochemical Technology 2016年第4期18卷 92-98页

作者： Jiang Zeqi Fang Jianhua Chen Boshui Wu Jiang Wang Jiu Zheng Zhe department of Military oil application & management engineering Logistical Engineering University

Tribological properties of 150 SN mineral oil and the oils doped with different contents of zinc butyloctyldithiophosphate(T202) under magnetic field or non-magnetic field were evaluated on a four-ball tribotester by applying an external magnetic field around the friction region. Moreover, the morphology and the tribochemical characteristics of worn surfaces were examined by a scanning electron microscope(SEM) and an X-ray photoelectron spectrometer(XPS). Then the lubrication mechanisms were discussed. The tribological test results indicated that the wear scar diameters(WSDs) of steel balls lubricated by the T202-containing lubricating oils and the friction coefficients of the corresponding oil under magnetic field were smaller than those without magnetic affection. The worn surface lubricated with the T202-formulated oils in a magnetic field was smoother than that obtained under the normal condition. Furthermore, the results of XPS analysis indicated that tribochemical films on the surfaces lubricated with T202-doped oils were mainly composed of compounds such as FeSO_4, FeS and ZnS. The atomic concentrations of oxygen, sulfur, iron, zinc and phosphorus species identified in T202 under magnetic field were higher than those without magnetic impact. It can be inferred that the improved anti-wear and friction-reducing ability of T202-doped oils was attributed to the promoted tribochemical reactions and the modification of the worn surfaces induced by magnetic field.

关键词： magnetic field zinc butyloctyldithiophosphate improvement lubrication

Tribological Properties of Functionalized Ionic Liquids Containing Ester-group as Lubricants for Steel-Steel System

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China Petroleum Processing & Petrochemical Technology 2012年第2期14卷 60-65页

作者： Zhu Liye Chen Ligong Xiang Shuo Chen Guoxu Yang Xin department of oil application&management engineering PLA Logistical Engineering UniversityChongqing 401311

A series of functionalized ionic liquids （ILs） containing ester-group were synthesized and their tribological prop- erties as lubricants for steel-steel contact were studied and compared with a non-functionalized ionic liquid and perfluo- ropolyethers （PFPE）. The morphology and chemical composition of the worn scars were analyzed by scanning electron mi- croscopy and X-ray photoelectron spectroscopy, respectively, and the possible lubrication mechanism of ILs was discussed. As a result, all ILs demonstrated a better lubricity and a much higher load-carrying capacity than PFPE used as lubricants for the steel-steel tribomates system. The functionalized ILs with ester-group showed slightly worse friction reducing abil- ity than their nonfunctionalized counterparts at relatively lower loads owing to their higher viscosity, but then exhibited better antiwear ability because the ester group they contained had not only physical but also strong chemical reactions with the freshly exposed steel surface and formed chemical adsorption boundary films on the worn surface during friction pro- cess. Under high loads, some triboehemical reactions took place between the active elements, such as fluorine which were released from the ILs, and fresh metal surfaces of rubbing pairs to form the admixture reaction films, which were mainly composed of ferric fluoride mixed with ferric oxide, leading to lower friction coefficients and good wear resistance.

关键词： functionalized ionic liquid 1-ethoxycarbonylmethyl-3-methyl bis(trifluoromethylsulfonyl)imide tribological behavior lubricant

Study on the Effect of Surface Modification on the Properties of Bentonite Greases

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China Petroleum Processing & Petrochemical Technology 2016年第4期18卷 99-109页

作者： Shi Chengfei Guo Xiaochuan Jiang Mingjun He Yan department of Military oil application & management engineering Logistical Engineering University of PLA

In order to investigate the influening factors of organic modification procedure and find out connections between organic modification and the properties of bentonite greases, organic montmorillonite(OMMT) thickeners with different surfactant dosages and constituents were synthesized through intercalation reaction between sodium montmorillonite(NaM MT) and quaternary ammonium surfactants in aqueous solvents. The lubricating greases were prepared with the resulting organoclays, while the penetration and oil separation of lubricating greases were evaluated, respectively. The surface modification process of montmorillonite(MMT) was analyzed and the thickening mechanism of OMMT was discussed in this study. The experimental results showed that, with an increasing amount of surfactant, the basal spacing between the clay platelets was increasing and the structure of modifier molecules layer in the interlayer was changing from lateral bilayer to paraffin-type bilayer. The optimal properties of lubricating greases were achieved, when the structure of surfactant molecules loaded in the interlayer was the paraffin-type monolayer, which meant that the dosage of modifier was equal to 120—140 mmol/(100g). Meanwhile, it was found that the thickening performance, colloid stability, anti-wear and friction-reducing performance of lubricating greases were improved, when the surfactants were mixed with octadecyl trimethyl ammonium chloride(OTAC) and hexadecyl trimethyl ammonium chloride(HTAC). And the optimum mole ratio of two surfactants is was 1:1.

关键词： organic montmorillonite surface modification thickening mechanism bentonite greases

Thermal decomposition characteristics and kinetics of methyl linoleate under nitrogen and oxygen atmospheres

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Petroleum Science 2015年第3期12卷 518-524页

作者： Xue-Chun Wang Jian-Hua Fang Bo-Shui Chen Jiu Wang Jiang Wu Di Xia department of Military oil application & Administration engineering Logistical Engineering University

The thermal decomposition characteristics of methyl linoleate （ML） under nitrogen and oxygen atmo- spheres were investigated, using a thermogravimetric analyzer at a heating rate of 10 ~C/min from room tem- perature to 600℃. Furthermore, the pyrolytic and kinetic characteristics of ML at different heating rates were stud- ied. The results showed that the thermal decomposition characteristics of ML under nitrogen and oxygen atmo- spheres were macroscopically similar, although ML exhibited relatively lower thermal stability under an oxy- gen atmosphere than under a nitrogen atmosphere. The initial decomposition temperature, the maximum weight loss temperature, the peak decomposition temperature, and the rate of maximum weight loss of ML under an oxygen atmosphere were much lower than those under a nitrogen atmosphere and increased with increasing heating rates under either oxygen or nitrogen atmosphere. In addition, the kinetic characteristics of thermal decomposition of ML were elucidated based on the experimental results and by the multiple linear regression method. The activation energy, pre-exponential factor, reaction order, and the kinetic equation for thermal decomposition of ML were obtained. The comparison of experimental and calculated data and the analysis of statistical errors of pyrolysis ratios demonstrated that the kinetic model was reliable for pyrolysis of ML with relative errors of about 1%. Finally, the kinetic compensation effect between the pre-exponential factors and the activation energy in the pyrolysis of ML was also confirmed.

关键词： Methyl linoleate Pyrolysis characteristics Kinetics Thermogravimetric analysis Biodiesel

Preparation and Tribological Behavior of Hydrophobic Lanthanum Borate Nanosheets in Rapeseed oil

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China Petroleum Processing & Petrochemical Technology 2016年第2期18卷 92-99页

作者： Gu Kecheng Chen Boshui Xue Ming Wang Jiu Fang Jianhua Wu Jiang department of oil application and management engineering Logistical Engineering University department of National Defense Architectural Planning and Environment engineering Logistical Engineering University

Oleic acid-capped lanthanum borate(abbreviated as OA/La BO_3·H_2O) nanosheets were prepared by the hydrothermal method. The microstructures of as-prepared OA/La BO_3·H_2O were characterized by means of SEM, TEM, EDS, FTIR and XRD, respectively. Moreover, the friction and wear properties of OA/La BO_3·H_2O as a lubricant additive in rapeseed oil were evaluated on a four-ball tribotester. The tribochemical characteristics of worn surfaces were investigated by SEM and XPS. The results showed that the hydrophobic OA/La BO_3·H_2O nanosheets exhibited their morphology with a diameter in the range of 100 nm to 300 nm and a thickness of about 25 nm, and displayed excellent dispersing stability in rapeseed oil. In the meantime, the rapeseed oil doped with OA/La BO_3·H_2O nanosheets markedly decreased the friction and wear of steel balls, and the optimal friction-reducing and antiwear ability of rapeseed oil was obtained at an OA/La BO_3·H_2O content of 1.0%. The outstanding tribological performance of OA/La BO_3·H_2O in rapeseed oil was attributed to the formation of a composite boundary lubrication film mainly composed of lubricious tribochemical species of B_2O_3, La_2O_3 and Fe_2O_3, and deposits of OA/La BO_3·H_2O nanosheets as well as the adsorbates of rapeseed oil on rubbed surfaces.

关键词： lanthanum borate nanosheet hydrophobicity friction wear rapeseed oil.

Pyrolysis Characteristics and Kinetics of Methyl Oleate Based on TG-FTIR Method

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China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 17-25页

作者： Wang Xuechun Fang Jianhua Chen Boshui Wang Jiu Wu Jiang department of Military oil application & Administration engineering Logistical Engineering University

The thermal decomposition characteristics of methyl oleate were preliminarily investigated under nitrogen atmo-sphere by a thermogravimetric analyzer when the ester was heated at a heating rate of 10℃/min from room temperature to 600℃. Furthermore, the pyrolytic and kinetic characteristics of methyl oleate were intensively studied at different heating rates. The gaseous species obtained during thermal decomposition were also identiifed by the TG-FTIR coupling analysis. The results showed that the pyrolysis of methyl oleate proceeded in three stages, viz. the drying stage, the main pyrolysis stage and the residual pyrolysis stage. The initial decomposition temperature, the maximum weight loss temperature, the peak decomposition temperature and the rate of maximum weight loss of methyl oleate increased with the increasing heating rates. Gaseous CO, CO2 and H2O were the typical decomposition products from pyrolysis of methyl oleate. In addition, a kinetic model for thermal decomposition of methyl oleate was built up based on the experimental results using the Coats-Redfern integral method and the multiplelinear regression method. The activation energy, the preexponential factor, the reaction order and the kinetic equation for thermal decomposition of methyl oleate were obtained. Comparison of the experimental data with the calculated ones and analysis of statistical errors of pyrolysis ratios demonstrated that the kinetic model was reliable for studying the pyrolysis of methyl oleate. Finally, the kinetic compensation effect between the preexponential factors and the activation energy in the pyrolysis of methyl oleate was also conifrmed.

关键词： methyl oleate pyrolysis kinetics thermogravimetric analysis biodiesel

The Role of Diesel Soot in the Tribological Behavior of 150SN Base oil

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China Petroleum Processing & Petrochemical Technology 2017年第2期19卷 89-95页

作者： Su Peng Xiong Yun Liu Xiao Yang He Fan Linjun Liu Ping department of oil application & management engineering Logistic Engineering University Chongqing 401311 Sinopec Research Institute of Petroleum Processing Beijing 100083

The diesel soot was collected from diesel engine exhaust pipe. The morphology and structure of the collected diesel soot was characterized by HRTEM, XRD and XPS and its tribological behavior was investigated by a SRV IV oscillating reciprocating friction and wear tester. Test results showed that the tribological behavior of diesel soot was largely influenced by the test load. Under a low load, the diesel soot could reduce the wear volume of the disc. While under a high load, the diesel soot could reduce the friction coefficient of base oil. Based on the characterization of the worn scars by the SEM technique, the 3D surface profiler and the Raman spectroscopy, it was assumed that the core-shell structure of diesel soot with several graphitic layers played important roles. On one hand, its spherical and special structure could make it roll between friction pairs to reduce wear under a low load. On the other hand, its outer-shell graphite layers could be peeled off to form lubrication film to reduce friction under a high load and shear force.

关键词： diesel soot tribological behavior core-shell structure 150SN base oil

Diester Derivatives from Chemically Modified Waste Cooking oil as Substitute for Petroleum Based Lubricating oils

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China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 76-83页

作者： Xiang Shuo Chen Ligong Xu Lan Li Liang Yang Xin Zhu Liye department of Military oil application & management engineering Logistical Engineering University of PLA School of Chemistry and Chemical engineering Southwest University oil Technical Supervision Office Logistical Department of Chengdu Military Area

In order to provide a new way for waste cooking oil(WCO) resource utilization, several diester derivatives were obtained from WCO through a three-step chemical modifications, viz.: transesterification, epoxidation and oxirane ring opening with carboxylic acids. The effects of the chain length of side chain groups on the viscosity, acid value, low temperature fluidity, thermo-oxidative stability, tribological properties and surface tension of diester derivatives were investigated. The results showed that increasing the chain length of side chain groups had a positive influence on the viscosity, viscosity index, acid value, pour point, friction coefficient and wear scar diameter along with a negative influence on the oxidation onset temperature, volatile loss, insoluble deposit, maximum non-seizure load and surface tension. These diester derivatives exhibited improved physicochemical and tribological properties that make themselves promising environmentally friendly biolubricant basestocks.

关键词： waste cooking oil diester derivative lubricating oil physicochemical property tribological property