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Gong Y.,PLA Logistical Engineering University | Guan L.,PLA Logistical Engineering University | Feng X.,PLA Logistical Engineering University | Zhu L.,Oil Technical Supervision Office | Wang L.,PLA Logistical Engineering University
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2016

Dielectric spectroscopy (DES) was adopted to analyze the complex lubricating oil system. Two-channel and differential dielectric spectroscopy (TD-DES) measurement method was proposed to study the degradation process of lubricating oil, which can eliminate the influences from sensor substrate and temperature disturbances. Ten lubricating oil samples were prepared by simulation oxidation under 150℃ with air flow and copper catalyst, which were called oxidation series samples. Eight used oil were collected from different in-service devices with different run motor hours, which were named by the in-service lubricant series samples. The information about oxidation, nitration and sulfation of all the samples was obtained by Fourier transform mid-infrared (FT-IR). TD-DES data of all the samples were discussed thoroughly compared with their FT-IR data. The results demonstrated that TD-DES measurement method could improve the detection sensitivity significantly. There were good linear relationships between the oxidation, nitration, sulfation peak areas of FT-IR and the TD-DES data. The Cole-Cole plots from TD-DES data could provide valuable information on the degradation of both oxidation and in-service lubricant series samples. With the two-dimensional disturbances, TD-DES measurement method will contribute to analysis of the complex organic mixture systems. © 2016, Science Press. All right reserved.

Zhu L.,Oil Technical Supervision Office | Zhu L.,PLA Logistical Engineering University | Chen L.,Oil Technical Supervision Office | Chen L.,PLA Logistical Engineering University | And 2 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2013

A functionalized ionic liquid containing ester-group, 1-ethoxycarbonylmethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (LF1-4), was synthesized and its tribological properties as an additive in rapeseed oil (RO) were evaluated on a four-ball machine and compared with a traditional additive zinc butyloctyl-dithiophosphate (T202). The morphology and main element of the worn scar surface of steel ball were analyzed by SEM and XPS, respectively. The results showed that LF1-4 possessed good friction-reducing ability and prominent anti-wear ability as an additive in RO. The optimum addition amount of LF1-4 in RO was 1.0%, when the wear scar diameter could be decreased by 38%. Furthermore, LF1-4 was effective in improving the load-carrying capacity (PB) of RO. But the friction-reducing and anti-wear ability of LF1-4 was slightly worse than that of T202 in RO, presumably due to the worse solubility of LF1-4 in RO. At high loads, some tribochemical reactions would take place between the active elements, such as fluorine released from the ionic liquid additive LF1-4 and fresh metal surfaces of rubbing pairs, to form ferric fluoride and some other new compounds, resulting in lower friction coefficient and good wear resistance.

Yingzhong G.,PLA Logistical Engineering University | Liang G.,PLA Logistical Engineering University | Liguang W.,PLA Logistical Engineering University | Liye Z.,Oil Technical Supervision Office
Sensors and Actuators, A: Physical | Year: 2016

In this paper, two-channel and differential dielectric spectroscopy (TD-DES) measurement method has been proposed and the corresponding TD-DES Analyzer based on AD5933 impedance converter chip has been designed. Both of the theoretical analysis of TD-DES measurement and the TD-DES experimental results resulted from oxidation-series samples prepared by simulation oxidation and in-service series samples collected from different in-service equipments have proved that TD-DES method can improve the measurement sensitivity significantly. Two typical stages for lubricating oil degradation process including the homogeneous DSP stage and the heterogeneous interfacial stage have been discovered and verified by the TD-DES characteristics data analysis for the oxidation-series and in-service series samples, especially the aqueous Ox-13-series and Ox-14-series samples. Good linear relationships between TD-DES data and FT-IR peak areas for both oxidation-series and in-service series samples have been obtained with the correlation coefficients are all greater than 0.93. TD-DES is a new effective method for lubricating oil quality sensing. © 2016 Elsevier B.V. All rights reserved.

Xiang S.,PLA Logistical Engineering University | Chen L.,PLA Logistical Engineering University | Xu L.,Southwest University | Li L.,PLA Logistical Engineering University | And 2 more authors.
China Petroleum Processing and Petrochemical Technology | Year: 2015

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.

Zhu L.-Y.,Oil Technical Supervision Office | Chen L.-G.,PLA Logistical Engineering University | Liu H.-C.,Oil Technical Supervision Office | Lei J.,Oil Technical Supervision Office | Zhang N.-S.,Oil Technical Supervision Office
Mocaxue Xuebao/Tribology | Year: 2014

In order to inhibit the serious corrosivity of conventional ionic liquids (ILs), a series of ILs containing benzotriazolium cations were synthesized. The physicochemical properties, thermal stabilities of these synthesized benzotriazolium ILs and the corrosion to steel were studied. The tribological properties of the synthesized ILs as lubricants for a Steel-Steel System were evaluated on an SRV friction and wear tester at room temperature and 150℃. The worn surfaces were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. It is found that, the benzotriazolium ILs possessed lower thermal stability but better friction-reducing and anti-wear ability than conventional imidazolium IL, which had the same anion as the benzotriazolium one. And more importantly, these benzotriazolium ILs had no corrosivity to steel, which was one of the important reasons for their better anti-wear ability. ©, Science Press. All right reserved.

Xiang S.,PLA Logistical Engineering University | Chen L.,PLA Logistical Engineering University | Yang X.,PLA Logistical Engineering University | Zhang P.,PLA Logistical Engineering University | Zhu L.,Oil Technical Supervision Office
Biotechnology | Year: 2015

Several triester derivatives with enhanced physicochemical and tribological properties were obtained from Waste Cooking Oil (WCO) through the following chemical modifications successively, transesterification of WCO, epoxidation of Fatty Acid Methyl Ester (FAME) and oxirane ring opening with anhydrides. Effect of the chain length increase of anhydrides on the low temperature fluid, viscometric properties and oxidation stability of triester derivatives were studied using pour point tester, viscometer and Pressurized Differential Scanning Calorimetry (PDSC), respectively. The tribological properties of triester derivatives were evaluated on a four-ball tribotester and the morphology of worn surfaces of steel balls was investigated by SEM. All triester derivatives showed better physicochemical properties, anti-wear ability and higher load-carrying capacity compared to 250BS, a representative of mineral oils. The three-step chemical modifications of the WCO re-utilization proposed in this study provide a feasible method to obtain high valueadded and eco-friendly products, i.e., biolubricants. © 2015 Asian Network for Scientific Information.

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