Naslov
Production and application properties of dispersive viscosity index improvers

Autori
Šoljić Jerbić, Ivana ; Parlov Vuković, Jelena ; Jukić, Ante

Izvornik
Industrial & engineering chemistry research (0888-5885) 51 (2012), 37; 11914-11923

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
styrene ; methacrylate ; N, N-dimethylaminoethyl methacrylate ; bifunctional peroxide initiator ; copolymerization ; conversion ; molecular weight ; viscosity ; dispersive viscosity index improvers ; lubricating mineral oils

Sažetak
Polymeric dispersive viscosity index improvers of lubricating mineral oils based on styrene, dodecyl-methacrylate, octadecyl methacrylate and N, N-dimethylaminoethyl methacrylate (d-PSAMA) were produced by performing copolymerizations isothermally up to the high-conversion in mineral base oil solution, using monofunctional or bifunctional peroxide initiator. The obtained kinetics results reveal the benefits of the usage of a bifunctional peroxide initiator over a monofunctional, since complete conversion of monomers was accomplished in the shorter reaction time, performing the process in a full batchwise mode. When the bifunctional initiator was applied the required polymerization temperature was slightly higer (105 oC) and copolymers of higher average molecular weight values (Mw = 60-120 kg mol-1) were obtained while in case of the monofunctional peroxide initiator the reaction temperature was 100 oC and average molecular weight values of copolymers were Mw = 30-100 kg/mol. Investigated application properties demonstrated that d-PSAMA additives were fully comparable with conventional pure methacrylate additives and also, it provided other advantages such as higher viscosity index and kinematic viscosity, lower values of pour point temperatures as well as better dispersant and detergent properties. Thus, increasing the N, N-dimethylaminoethyl methacrylate share in copolymers from 2 to 10 mol.% their weight average molecular weight decreased from 120 to 60 kg mol-1, while kinematic viscosity values at 100 oC remain high and amounted 14.5 ± 0.5 mm2 s-1.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA