Studies On Competitive Interactions and Blending Order of Engine Oil Additives by Variable Temperature31P-NMR and IR Spectroscopy
作者:
G.S. Kapur,
A. Chopra,
A.S. Sarpal,
S.S. V. Ramakumar,
S.K. Jain,
期刊:
Tribology Transactions
(Taylor Available online 1999)
卷期:
Volume 42,
issue 4
页码: 807-812
ISSN:1040-2004
年代: 1999
DOI:10.1080/10402009908982287
出版商: Taylor & Francis Group
关键词: Additive Interaction;Dispersants
数据来源: Taylor
摘要:
Interactions between various engine oil additives including dispersant, detergent, antiwear/antioxidant, and viscosity index improvers have been investigated through changes in the31P-NMR and IR spectra. Significant changes in the31P-NMR and IR spectra of zinc dialkyldithiophosphate (ZDDP) have been observed by varying the blending order of additives. Dispersant-detergent (polyisobutylene succinimide-calcium overbased sulfonate) and viscosity index improver-detergent (dispersant olefin copolymer-calcium overbased sulphonate) interactions were found to be strong and irreversible in nature. Variable temperature31P-NMR spectra have provided enough evidence to suggest that the actual performance of an additive may not be decided by its bulk interactions with other additives at room temperature, and that tribochemical reactions occurring at higher temperature play a greater role.
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