The Thermal Degradation and EP Performance of Zinc Dialkyldithiophosphate Additives in White Oil
作者:
R.C. Coy,
R.B. Jones,
期刊:
A S L E Transactions
(Taylor Available online 1981)
卷期:
Volume 24,
issue 1
页码: 77-90
ISSN:0569-8197
年代: 1981
DOI:10.1080/05698198108983000
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The oil-soluble degradation products formed in heated samples of oil containing zinc di(n-, iso- or s-butyl)dithiophosphate (ZDTP) additives have been identified using1H and31P nuclear magnetic resonance spectroscopy. The final degradation product in each case is S,S,S-trialkyltetrathiophosphate, SP(SR)3. The intermediate degradation products are O,S,S-trialkyltrithiophosphate, SP(SR)2(OR) and O,O,S-trialkyldithiophosphate, SP(SR)(OR)2. The rate of thermal degradation of the ZDTPs follows the order s-butyl > > n-butyl > isobutyl. A white, noncrystalline precipitate is formed in the heated oils which is rich in zinc and oxygen and low in phosphorus and sulfur compared with the original ZDTP.
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