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Synthesis and characterisation of antioxidant‐modified esters of dipentaerythritol as lubricating base oil
Author(s) -
Zhang Letao,
Cai Guoxing,
Wang Yonglei,
Eli Wumanjiang
Publication year - 2013
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1183
Subject(s) - viscosity index , antioxidant , base oil , fourier transform infrared spectroscopy , chemistry , lubricant , organic chemistry , thermogravimetric analysis , flash point , pour point , base (topology) , acid value , viscosity , infrared spectroscopy , nuclear chemistry , chemical engineering , materials science , biochemistry , scanning electron microscope , mathematical analysis , mathematics , engineering , composite material
In this paper, five antioxidant‐modified esters were synthesised through two steps of simple esterification. Antioxidant‐modified multi‐hydroxyl compound was synthesised at the first step, and antioxidant‐modified esters were synthesised at the second step. This kind of esters is useful in many fields, such as lubricating oil and cutting compound, because of two important functions (antioxidant and lubricant) in the same compound. The active antioxidant group attached to these esters was 3‐(3,5‐di‐ tert ‐butyl‐4‐hydroxy‐phenyl)‐propionic acid. The esters were characterised with Fourier transform infrared spectroscopy (FTIR) and thermogravimetric (TG) analysis. The analytical results of FTIR demonstrates the changes of alcoholic hydroxyl and carboxyl and suggests that this synthesis was feasible. The TG analysis and rotating pressure vessel method show that this kind of esters has excellent oxidative stability. The physical properties of lubricating base oil, such as viscosity, viscosity index, pour point and flash point, suggested that this kind of esters can be used as lubricating base oil. Copyright © 2012 John Wiley & Sons, Ltd.