纤维素/SiO_(2)润滑脂的制备及性能分析

Preparation and properties of cellulose/SiO_(2)grease

【目的】旨在以可再生的天然纤维素为稠化剂制备可持续发展的环保型润滑脂产品。【方法】分别以纯纤维素、气相二氧化硅(SiO_(2))以及纤维素/SiO_(2)为稠化剂制备了3组稠度等级为2#的润滑脂产品,并对其进行了锥入度测试、滴点测试、分油率测试、流变性能测试以及摩擦学性能测试。【结果】SiO_(2)表面的硅羟基与纤维素羟基可以发生氢键作用,改善了润滑脂的理化性质、流变性能以及摩擦学性能。理化性质方面:相较于纤维素润滑脂和SiO_(2)润滑脂,纤维素/SiO_(2)润滑脂具有较低的分油率,胶体安定性得到提高,并且在327℃时出现了滴点,改善了SiO_(2)润滑脂在高温下易失去流动性的缺点。流变特性方面:纤维素/SiO_(2)润滑脂的黏温性能和抗剪切能力较SiO_(2)润滑脂得到了提高,且剪切破坏后的结构恢复速度更快,结构体系更加稳定。摩擦学性能方面:纤维素/SiO_(2)润滑脂相较于纤维素润滑脂和SiO_(2)润滑脂,其减摩性能得到了提高,具有最低的摩擦系数和摩擦力。【结论】获得了具有实用前景的纤维素基润滑脂,符合国家低碳及可持续发展战略。

[Objective]With the increasing depletion of petrochemical resources and the environmental pollution caused by the extraction and use process,sustainable and environmentally friendly lubricating grease products have been prepared using renewable natural cellulose as a thickener.[Method]Three sets of lubricating grease products with a viscosity grade of 2#were prepared using pure cellulose,gas-phase SiO_(2),and cellulose/SiO_(2) as thickeners,and their penetration,drop point,oil separation rate,rheological properties,and tribological properties were tested.[Result]The silicon hydroxyl groups on the surface of SiO_(2) can undergo hydrogen bonding crosslinking with the hydroxyl groups of cellulose,improving the physicochemical properties,rheological properties,and tribological properties of lubricating grease.In terms of physicochemical properties,compared to cellulose grease and SiO_(2) grease,cellulose/SiO_(2) grease has a lower oil separation rate and improved colloidal stability;And a drop point appeared at 327℃,which improved the fluidity at high temperatures of silicone grease.In terms of rheological properties,the viscosity temperature performance and shear resistance of cellulose/SiO_(2) lubricating grease have been improved,and the structural recovery speed is faster than that of silicone grease,and the structural system is more stable.In terms of tribological performance,compared to cellulose grease and SiO_(2) grease,cellulose/SiO_(2) grease has an improved friction reduction effect,with the lowest friction coefficient and friction force.[Conclusion]A cellulose based grease with practical prospects has been obtained,which is in line with the national low-carbon and sustainable development strategy.