TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Viscosity Improvers for Multi-Grade Oils
(Indicii de viscozitate ai unor uleiuri multigrad)
Vol LIX • No. 2/2007
Ioana Stanciu, Minodora Leca
Universitatea Bucuresti, Bd. Regina Elisabeta 4 -12, 030018 Bucureşti, România
e-mail: ioasta2003@yahoo.uk.com

 Keywords   viscosity index, viscosity improvers, multi-grade oils

 Abstract
To establish the ability of INFINEUM SV 260 and KELTAN 4200 copolymers solutions in SAE W10 mineral oil as solvent to perform at low and high temperatures in a vehicle's engine, that is their capacity to improve the oil's viscosity index, the viscosity/ temperature characteristics of their 3 and 6% solutions were determined. It was obtained that the both copolymer increase very much the viscosity index, as much as their concentration is higher. The highest effect was obtained using KELTAN 4200, the increase of viscosity indices being as high as 2.83 times for 3% solution and 4.28 times for 6%, while using INFINEUM SV 260 it was 2.39 and 3.35 times respectively. The viscosity-temperature coefficients, calculated from their kinematic viscosities at 40 and 100oC, show also that KELTAN 4200 is a better viscosity index improver than INFINEUM SV 260.

 Rezumat
În cadrul acestui articol este prezentata determinarea indicilor de viscozitate ai unor uleiuri aditivate cu polimerii KELTAN 4200 şi INFINEUM SV 260 cu diagrama ASTM D 2270-9. Cel mai eficient copolimer pentru transformarea SAE 10W in ulei multigrad este KELTAN 4200, deoarece creşterea I.V. este mai mare la ambele concentratii.



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