engleski

Rheological Properties and Miscibility of Poly(alkyl methacrylate) and Polyolefine Lubricating Oil Mixed Additive

The rheological properties of solutions of mixed polymeric additives on the base of ethylene/propylene copolymer (OCP) and poly(alkyl methacrylate) (PAMA) in base mineral oil have been examined. The viscosity and the solution shear stability of the additives is directly proportional to concentration and OCP content, whereas the viscosity index and pour point temperature mainly depends on the PAMA content, established by standardized methods. Viscosities of the mixed additive solutions obey typical Krigbaum-Wall equation for thermodynamically ideal behavior of ternary polymer solutions. Based on the ratio of specific viscosities at 40 and 100 oC (Q) the OCP additive solution showed better thickening effect at lower temperatures (Q << 1) and the PAMA additive solution at higher temperatures (Q > 1) with more coherent thickening effect with temperature change. The obtained results give the prospects for design of lubricant formulations with mixed polymeric additives.

Lubricant Rheology; Polymeric Mixed Additives; Miscibilty; Viscosity; Viscosity Index Improver; Pour Point Depressant

nije evidentirano