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Amide-Based Anti-Wear/Extreme-Pressure Additives for Silica-Thickened Greases: Structure and Wear Resistance
Jolanta Drabik1, Kamil Korasiak2,3, Justyna Chrobak2
1Łukasiewicz Research Network-Institute for Sustainable Technologies, 26-600 Radom, Poland.
Molecules (Basel, Switzerland)
|June 27, 2025
Summary
Three secondary amides show promise as anti-wear/extreme-pressure additives for lubricants. N-propyloctanamide (AC3C8) demonstrated superior performance, especially when immobilized on SBA-15 nanosilica, enhancing lubricant properties.
Area of Science:
- Tribology
- Materials Science
- Lubrication Engineering
Background:
- Secondary amides are explored as potential lubricant additives.
- N-propylpropanamide (AC3C3), N-propyloctanamide (AC3C8), and N-propyldodecanamide (AC3C12) were synthesized and evaluated.
- SBA-15 nanosilica was investigated as a novel support for lubricant additives.
Purpose of the Study:
- To evaluate the anti-wear (AW) and extreme-pressure (EP) properties of three secondary amides.
- To assess the performance of amides immobilized on SBA-15 nanosilica.
- To investigate synergistic effects between amides and commercial additives in silica-thickened greases.
Main Methods:
- Four-ball apparatus method for tribological testing.
- Synthesis and immobilization of amides onto SBA-15 nanosilica.
- Evaluation of lubricant performance in base oil and silica-thickened grease formulations.
Main Results:
- N-propyloctanamide (AC3C8) exhibited the best AW/EP properties among the studied amides.
- SBA-15-immobilized amides showed enhanced performance compared to non-immobilized counterparts.
- A synergistic effect was observed between AC3C8 and a commercial additive, significantly improving the Goz40 parameter and welding load.
Conclusions:
- Secondary amides, particularly AC3C8, are promising AW/EP lubricant additives.
- Immobilization on SBA-15 enhances amide performance, though stability requires further research.
- Synergistic formulations offer substantial improvements in lubricant properties for demanding applications.
Keywords:
SBA-15amidesanti-wear propertiesextreme-pressure propertiesgreaseslubricantssilica nanoparticlesMore Related Videos
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