Preparation of water-soluble nanographite and its application in water-based cutting fluid

Abstract

Water-soluble nanographite was prepared by in situ emulsion polymerization using methacrylate as polymeric monomer. The dispersion stability and dispersion state of graphite particles were evaluated by UV-visible spectrophotometry and scanning electron microscopy, respectively. The water-soluble nanographite was then added into the water-based cutting fluid as lubricant additive. The lubrication performance of water-based cutting fluid with the nanographite additive was studied on four-ball friction tester and surface tensiometer. Results indicate that the modification method of in situ emulsion polymerization realizes the uniform and stabilized dispersion of nanographite in aqueous environment. The optimal polymerization condition is 70°C (polymerization temperature) and 5 h (polymerization time). The addition of nanographite decreases the friction coefficient and wear scar diameter by 44% and 49%. Meanwhile, the maximum non-seizure load (PB) increases from 784 to 883 N, and the value of surface tension (32.76 × 10−3 N/m) is at low level. Nanographite additive improves apparently the lubrication performance of water-based cutting fluid.

Controllable synthesis of different morphologies of CuO nanostructures for tribological evaluation as water-based lubricant additives

“…Water-based lubricants are environmentally friendly, inexpensive, safe, and easy to clean, and possess excellent cooling properties. Consequently, they find application in many fields, including metal cutting, mechanical processing, and as drilling fluids [1][2][3][4]. However, water-based lubricants experience limitations to their wider practical application [5] due to their intrinsic limitations, including insufficient lubricity, poor rust resistance, and short service life.…”

Tribological Behaviors of Graphene and Graphene Oxide as Water-Based Lubricant Additives for Magnesium Alloy/Steel Contacts

“…In contrast, GO displayed higher friction-reducing and anti-wear capability than graphene did. The 0.5 wt.% addition of GO in the water offered reduction of friction coefficient by 77.5% and reduction of wear rate by 90% compared with the pure water, which is also larger than the reported values for other nanomaterial water-based additives, e.g., Al 2 O 3 (27% friction and 22% wear reduction with the addition of 1 wt.%) [ 40 ], TiO 2 nanoparticles (50% friction and 27% wear reduction with the addition of 0.8 wt.%) [ 41 ], and nanographite (44% friction and 49% wear reduction with the addition of 1.0 wt.%) [ 42 ]. It can be considered that the superior tribological performances of GO nanofluids results from the intrinsic surface oxygen-containing functionalized groups, such as carbonyl (C=O), hydroxide (C–OH) and carboxyl (COOH).…”

Circulating purification of cutting fluid: an overview

“…In addition, the antirust problem of the processed workpiece must be maintained during long-term placement. A cutting fluid with excellent performance needs to have lubrication, cooling, cleaning, antirust and other effects to solve these problems [11].…”