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The contribution of new dispersant mixed polymers to the economy of engine oils
Author(s) -
Pennewiß H.,
Auschra C.
Publication year - 1996
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010080206
Subject(s) - dispersant , polymer , olefin fiber , gasoline , elastomer , diesel fuel , materials science , methacrylate , compatibility (geochemistry) , copolymer , chemical engineering , polymer science , organic chemistry , chemistry , waste management , engineering , composite material , dispersion (optics) , physics , optics
Mixed polymers have been concentrated to produce highly concentrated VI improvers based on polyalkyl methacrylates (PAMA) and olefin copolymers (OCP). Because of their liquid form and special viscosity/temperature relationship, these concentrates can be stored, shipped and processed at comparatively low temperatures. This, in combination with a high specific activity, favours the economic manufacture of multigrade oils. In the VW elastomer compatibility test, the new dispersant mixed polymers (d‐MP2) show absolutely neutral behaviour towards fluoroelastomers. In gasoline as well as in diesel engines they contribute noticeably to the dispersant potential, thus making it easier to comply with the requirements for API SH. Moreover, bench and road tests have revealed a major reduction of engine wear. The effect of different dispersant groups is compared by way of a simple laboratory test and an attempt is made at corroborating a hypothesis on wear reduction.