Improving the tribological performance of biopolymer coating with MoS2 additive

Green manufacturing has gained extensive attention in the field of manufacturing and processing. Developing biopolymer lubricants, such as hydroxyl propyl methylcellulose (HPMC), is an appealing research direction. HPMC is an organic polymer with high moisture resistance and formability that is commonly used as an external protective layer on food products and in the pharmaceutical industry. HPMC protective layers demonstrate lubricating and wear-resistance characteristics. However, the practical application of HPMC is limited by its weaknesses such as a short protection life and unstable long-term operation. This deficiency can be ameliorated by adding solid lubricant additives that exhibit high wear resistance. Molybdenum disulfide (MoS₂) is a favorable option for green tribological additives. Molybdenum disulfide (MoS₂) demonstrates superior lubrication properties and biocompatibility. However, it is primarily employed as an additive for lubricants that are potentially hazardous to the environment, such as base oils, paraffin, and hexane. In addition, the nanoparticles added to these lubricants often sediment and aggregate, resulting in unstable lubrication effects. Highly crystallized coating structures with uniformly distributed crystals were obtained by adding MoS₂ nanoparticles to an HPMC biopolymer, synthesizing a thickness-controllable composite MoS2–HPMC coating material. Coatings with MoS2 nanoparticles effectively improved the tribological properties of the HPMC material and reduced the friction coefficient by over 40%, improving the stability of wear and lubrication behavior. During wear behavior, the MoS₂ nanoparticles were transferred onto the steel ball, creating a highly crystallized MoS₂ transfer layer, which was the primary reason for the reduction in friction and the stabilization of the tribological properties. The tribological properties of green lubricant are influenced by the morphology and content of MoS₂ additives. An appropriate amount of MoS₂ additive has a tribological advantage, demonstrating that MoS₂ possessed the dominant tribological behavior.

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