期刊
POLYMERS
卷 12, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/polym12102256
关键词
levulinic acid; polyol ester; biolubricant; tribological behaviors
资金
- National Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07402004]
- practical and innovative training program for College Students of Nanjing Forestry University [201810298168H]
- Qilu University of Technology
In this study, a polyol ester from levulinic acid (LA) and trimethylolpropane (TMP) was synthesized by enzymatic catalysis in a solvent-free system. The total conversion of TMP reached up to 84% on average after lipase recycling for five times. The produced ester showed excellent lubrication properties, such as high viscosities at 40 degrees C (86.53 mm(2)/s) and 100 degrees C (8.91 mm(2)/s), a good viscosity index (49), a low pour point (-27 degrees C), and a high flash point (223 degrees C). The frictional wear behavior was evaluated on a four-ball test machine (FTM) by adding the ester into a reference mineral oil. The blend with 10% ester showed a smaller wear scar diameter (WSD) (0.62 mm) when compared with that of pure mineral oil (0.78 mm). The results demonstrated that the obtained ester has huge potential as biolubricant basestock.
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