Dispersion and tribological properties of nano-MoS2/sericite particles in di-n-butyl adipate synthesized by their own catalysis

A novel method was proposed to improve the dispersion and lubrication of nano-MoS 2 in ester oil. The synthesis of di-n-butyl adipate (DBA) was catalyzed at 145 °C using spherical nano-MoS 2 /sericite (S-MoS 2 /sericite), and the esterification rate reached 95.4%. After the reaction, S-MoS 2 /sericite remained in DBA with a content of ~400 mg/L, and the dispersion system could be stored stably for at least 45 days. Compared with the pure DBA, after standing for 45 days, the dispersion system reduced friction by ~16% and wear by ~72%. At high load and low speed, a tribofilm containing MoS 2 was formed at the ridge of furrow; at low load and high speed, S-MoS 2 /sericite was embedded in the soft surface to lubricate the friction pair. • Spherical nano-MoS 2 /sericite demonstrated a good ability to catalyze the synthesis of ester oil. • Spherical nano-MoS 2 /sericite dispersed in the product ester stably for at least 45 days. • The obtained dispersion system displayed excellent tribological properties. • A new solution to the dispersion problem of MoS 2 in base oil was provided.