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http://dx.doi.org/10.14478/ace.2018.1020

Synthese and Anti-wear Properties of Diol Derivatives Containing Dithiophosphate Group-effect on Main Alkyl Chain and Side Alkyl Chain  

Ko, Kyung-Min (Environment & Sustainable Resources Research Center, Korea Research Institute of Chemical Technology)
Han, Hye-Rim (Environment & Sustainable Resources Research Center, Korea Research Institute of Chemical Technology)
Kim, Young-Wun (Environment & Sustainable Resources Research Center, Korea Research Institute of Chemical Technology)
Kang, Ho-Cheol (Environment & Sustainable Resources Research Center, Korea Research Institute of Chemical Technology)
Jeong, Noh-Hee (Department of Engineering Chemistry, Chungbuk National University)
Publication Information
Applied Chemistry for Engineering / v.29, no.4, 2018 , pp. 405-412 More about this Journal
Abstract
Three types of bis[3-(dialkyloxylphosphorothionyl) thio-2-methylpropanyloxy]alkane (BAPA) drived from alkane diol were synthesized. The principal chain of each BAPA had a different carbon number, i.e., 6, 9, and 11. The three types of synthesized BAPA were compared to zinc dialkyl dithiophosphates (ZDDPs) in terms of abrasion resistance. A four-ball test was conducted to evaluate the anti-abrasion performance of the synthesized BAPA according to the length of the principal carbon chain. Each product was added to an additive at a concentration of 1% of the base oil weight, and the wear scar diameter (WSD) was measured as 0.472, 0.459, and 0.480 mm, respectively. Among the BAPA compounds, dialkyl dithiophosphoric acid (DDP), which is the side chain of bis[methacryloyloxy] nonane (BMOO9), was synthesized by varying the carbon number, i.e., 4, 8, and 12, and subsequently the 4-ball test was carried out. The WSD was determined as 0.537, 0.459, and 0.531 mm, respectively. As a result, it was found that when a side chain is short, a thin film is formed. In contrast, a long side chain hindered the formation of a film, and hence the best result was achieved when the carbon number was 8. As for the ZDDPs, the WSD was determined to be 0.563 mm, when measured under the same conditions. The measurements confirm that the synthesized BAPA compounds are superior to the ZDDPs as abrasion resistance additives.
Keywords
Bis[3-(dialkyloxyphosphorothionyl)thio-2-methylpropanyloxy] alkane; anti-wear properties; lubricant additives; tribofilm; side chain; main chain; wear scar diameter;
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