Journal
TRIBOLOGY INTERNATIONAL
Volume 123, Issue -, Pages 329-336Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2018.02.027
Keywords
Cellulose pulp; Alkali treatment; Gel-like dispersion; Rheology; Tribology
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Funding
- FEDER the Spanish Ministry of Economy, Industry and Competitiveness (MINECO) [CTQ2014-56038-C3-1R]
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The main aim of this study was to elucidate the influence of an alkali treatment on the rheological and tribological properties, and microstructure, of cellulose pulp-based gel-like dispersions potentially usable as biodegradable lubricating greases. For this purpose, cellulose pulp was treated with sodium hydroxide under different conditions of alkali concentration (20, 30 and 40%), temperature (20, 45 and 75 degrees C) and contact time (1 and 2 h). Favourable conditions relative to the rheological response of a commercial lithium lubricating grease used as benchmark were found to be 40% NaOH, 20 degrees C and 2 h. Gel-like dispersions with acceptable lubrication properties in terms of consistency indices, mechanical stability, and frictional and wear performance, were obtained by using a 6-7% (w/w) proportion of cellulose pulp.
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