Cardoon biolubricant through double transesterification: Assessment of its oxidative, thermal and storage stability

•A cardoon biolubricant through double transtesterification was obtained.•Viscosity, viscosity index, and thermal and oxidative stability tests were obtained.•There was quality loss in cardoon biolubricant during storage.•Viscosity increased and viscosity index decreased, suggesting antioxidant addi...

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Bibliographic Details
Published in:Materials letters 2021-11, Vol.302, p.130454, Article 130454
Main Authors: Nogales-Delgado, Sergio, Encinar Martín, José María
Format: Article
Language:English
Subjects:
Antioxidants
Biomedical materials
Cynara Cardunculus
Fatty acid methyl esters
Induction point
Lubricants
Materials science
Oxidation
Stability analysis
Storage stability
Temperature
Thermogravimetric analysis
Thermogravimetry
Transesterification
Viscosity
Viscosity index
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Summary:•A cardoon biolubricant through double transtesterification was obtained.•Viscosity, viscosity index, and thermal and oxidative stability tests were obtained.•There was quality loss in cardoon biolubricant during storage.•Viscosity increased and viscosity index decreased, suggesting antioxidant addition. Biolubricants could be a suitable replacement for industrial lubricants, due to their good performance and environmental-friendly quality, showing better flash and combustion points. However, depending on the raw material, the quality of biolubricants can vary, especially concerning oxidative and storage stability. The aim of this research work was to assess the stability of cardoon biolubricant, paying attention to oxidation and thermal and storage stability (by using the Rancimat method, thermogravimetry and viscosity during storage, respectively). The high linoleic acid content in cardoon oil (exceeding 25 %) could influence the low oxidative stability of cardoon biolubricant (3 h), implying changes in quality parameters during storage (viscosity increased above 15 % and viscosity index decreased about 23 %). Thus, the use of antioxidants is advisable to keep its properties over time.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.130454