Study On Poly-α-olefin Lubricating Base Oil Ssynthetic And Semi-synthetic Oil Applied Research

This article uses the a-olefins as raw materials and the (C2H5)2AICl/TiCl4as catalytic system, through the using the coordination polymerization method synthesized the Grade Ⅳ lubricating base oil (PAO) in oligomerization. Synthetic conditions and purification process of lubricating base oil from the poly-α-olefin (PAO), and its semi-synthetic oil applications were studied. Through research the experiments under different conditions and performance analysis of the refined Oligomerization products, the results showed that the best reaction temperature was40℃, the best reaction Raw material was1-decene and different types of raw materials could produce the products of different performance. By using On-line infrared spectrum analysis on the Ziegler-Natta catalysis1-decene oligomerization process, The results indicated the best reaction time was4h.The PAO base oil and Class Ⅱ mineral oil mixed experiment demonstrated that they had the antagonistic effect on cryogenic property and viscosity-temperature behavior of semi-synthetic oil,when the Volume fraction of PAO less than15%in semi-synthetic oil, and then it changed gradually into the complete mutual solubility effect.Nevertheless, when the viscosity of PAO in semi-synthetic oil is similar to Class II mineral oil, antagonistic effect is on the small side.This phenomenon explains why difficult to find the semi-synthetic oil which had low PAO content in industry and why foreign high-end semi-synthetic base oils typically use the harmonic proportion of5:5or4:6.By using technology of molecular designing and simulation, The theoretical molecular simulation system of PAO base oil was drawed.Potential Energy and Nonbond Energy in oligomerization products was researched. Simulation compared the molecular conformation and thermodynamic change of a Poly-α-olefin molecules which had high molecular weight and the C30that is typical molecule in PAO.In this treatise, all kinds of properties of PAO base oil and their semi-synthetic oil were checked and analysed, the results manifested that technologcial conditions and combination property of oil could meet the requirements of manufacturing production and industrial application. And by simulating of theoretical molecular models explained their segmental mechanism of action, attained the research requirements of this subject.