Alkyl methacrylate and styrene terpolymers as lubricating oil viscosity index improvers

Abstract

The properties of styrene/dodecyl methacrylate/octadecyl methacrylate terpolymers as viscosity index improvers of lubricating mineral oils were investigated. Terpolymers of different composition and molar mass were prepared by peroxide-initiated polymerization of the monomer mixture in a mineral base oil solution. All the terpolymer solutions in base oil exhibited high kinematic viscosity and viscosity index values (> 130), proving their high thickening efficiency. The ratio of viscosity values at 100°C and 40°C of styrene/alkyl methacrylate additive solutions was between 0.95 and 1.0, showing the coherent thickening effect in a wide temperature range, comparable with pure alkyl methacrylate additives. Increasing content of styrene in the additive and decreasing molar mass of the terpolymer resulted in a decrease in viscosity and viscosity index while the shear stability increased. The obtained results give guidelines for optimization of the terpolymers composition and structure in order to assure the best lubricant application properties.

The internal structure of poly(methyl methacrylate) latexes in nonpolar solvents

“…The significance of such dispersions can be appreciated by considering the many various industrial sectors that make use of them, which include petrochemicals [13], lubricants [7,14,15], reprography [4,5], inkjet printing [5], magnetic recording media [4], rheological fluids [16,17], and electronic displays [18][19][20][21]. Poly(methyl methacrylate) (PMMA) latexes, originally developed through an industrial-academic collaboration between the University of Bristol and ICI [22,23], have proved an essential tool for colloid scientists to develop new technologies and study fundamental interactions in nonpolar media.…”

Simulation and Field Measurements of Reliability Parameters of Dump Truck Hydraulic System

“…However, during the operation of BelAZ dump trucks in a wide range of ambient temperatures, the work is deteriorating up to the failure of the hydraulic steering system and the platform lift-lowering system. This is due to a changing of the oil's kinematic viscosity when the temperature is raised [5,[9][10][11][12].…”

Efektivitas karet alam termoplastik sebagai peningkat indeks viskositas minyak pelumas kendaraan

“…Supaya minyak pelumas dapat tetap mempertahankan viskositasnya terhadap perubahan suhu, maka ketika pembuatan minyak pelumas, minyak lumas dasar yang digunakan ditambah dengan bahan aditif jenis peningkat indeks viskositas (viscosity index improver) (Almeida et al, 2014). Bahan peningkat indeks viskositas umumnya berupa polimer yang memiliki bobot molekul tinggi seperti polimetakrilat, poliakilmetakrilat, poliolefin, polidiena, polistirena yang dialkilasi dan poliester (Jukic et al, 2007;Adriany & Yuliarita, 2009). Meskipun ditambahkan dalam konsentrasi yang cukup rendah, polimer akan sangat mempengaruhi reologi terutama viskositas dan indeks viskositas minyak pelumas (Sklepić et al, 2008).…”