Preparation and Properties of Water-Dispersive Graphene-Based Antifriction Additives
As a green lubrication technology,aqueous lubrication has attracted much attention in the fields of metal processing,mold demolding,and so on.Although graphene has excellent antifriction and wear resistance,it cannot be directly used as aqueous lubricant due to its poor water dispersity.In order to improve the water dispersity of graphene,hydrophilic groups need to be attached to its surface.Herein,graphene oxide was prepared by modified Hummer's method.After further activating functional groups on graphene oxide with chlorination reagent,the surface of graphene oxide was chemically modified with 4-aminopyridine,4-aminopiperidine,and p-aminobenzene sulfonic acid,and three water-dispersive graphene products with different structures were obtained.The structures of these graphene derivatives were analyzed by Fourier transform infrared spectroscopy,X-ray diffraction and scanning electron microscope,and the lubricating properties as water-soluble additives were tested and compared.The results showed that small organic molecules,especially 4-aminopiperidine,successfully improved the dispersity of graphene in water plus excellent antifriction properties.
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