Abstract
This study investigates the development of novel montmorillonite/castor oil blends to formulate sustainable lubricating greases to promote the replacement of petrochemicals industry-derived materials by substances obtained from renewable sources. Specifically, the effect of the thickener concentration on the rheological, chemical, thermal, tribological properties, and atomic force microscopy (AFM) microstructure of these systems were studied. The results showed that the C20A nanoclay content could be used to modulate the viscosity values, the linear viscoelastic functions, and tribological properties of these montmorillonite dispersions. In general, these gel-like dispersions exhibited remarkable lubricant properties; the samples showed values of the friction coefficient and wear scars similar or lower than those obtained with model bentonite grease.
Highlights
During the last few years, the depletion of fossil fuels and the general raising of global concern over environmental risks and climate change have aroused a global widespread alarm
A relevant increase in c was achieved when the C20A content was increased, yielding a higher structural colloidal network to shear stress. These results are in good agreement with those obtained from other oleogels based on ethylene-vinyl acetate copolymer (EVA) copolymer and vegetable oils [11]
An approach to the development and characterization of new oleogels based on organically modified montmorillonite and castor oil applicable as sustainable lubricating greases has been successfully tested for the first time
Summary
During the last few years, the depletion of fossil fuels and the general raising of global concern over environmental risks and climate change have aroused a global widespread alarm. Over the past years, developing materials or products with montmorillonite for several applications such as biomedical, car industry, as drilling fluids, and as gas-barrier materials has attracted great interest [7], due to the fact that the production of polymer-montmorillonite systems allows adjustments in the mechanical and thermal properties of polymers [8] Another potential use of this clay could be as thickener agent to develop gel-like dispersions in vegetable oils with suitable mechanical properties [9]. The objetive of this work is to study the possibility of using organo modified montmorillonite as gelling agent to develop appropriate systems with castor oil, suitable as lubricating greases With this in mind, rheological, chemical, thermal, tribological properties, and morphol ogical characterization were carried out on samples. The organoclay content effect on the multifunctional performance was summarized and the optimal formulation of the oleogel-like dispersions based on castor oil and organoclay was determined
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