Antiwear additives for neopentyl type esters - Design and performance evaluation of amine salts of phosphonic acid

被引：0
|
作者：
Hirao, K [1 ]
Hasegawa, T [1 ]
Kidera, Y [1 ]
Memita, M [1 ]
Minami, I [1 ]
机构：
[1] Iwate Univ, Fac Engn, Dept Chem Engn, Morioka, Iwate 020855, Japan
来源：
JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS | 2003年 / 48卷 / 09期
关键词：
boundary condition; trimethylol propane esters; nonpolarity index; antiwear additive; amine salts of phosphonic acid; dipole moment; computer assisted chemistry; molecular orbital method;
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Antiwear properties of phoshphonic acid derivatives in trimethylolpropane esters were investigated under boundary lubrication conditions. Effect of molecular structure of phoshphonic acid derivatives on antiwear properties was observed. The computer assisted chemistry was applied to explain the phenomena. Dipole moment of derivatives was calculated by means of molecular orbital method. Good relationship of dipole moment of the derivatives with their antiwear properties was found. Antiwear properties of dialkyl phosphonates depend on polarity of base fluid. Nonpolarity index (NPI) of trimethylolpropane ester molecule was calculated to explain the phenomena. The trimethylolpropane esters have NPI in the range of 34.3 - 185.5. Dialkyl phosphonates provide good antiwear properties in less polar trimethylolpropane esters, whereas their antiwear properties are not sufficient in polar trimethylolpropane esters. Antiwear properties of dialkyl phosphonates in mixture of trimethylolpropne esters were also investigated. Amine salts of phosphonic acid were designed as new antiwear additive system for trimethylolpropane esters by use of the computer assisted chemistry. Excellent antiwear properties of the salts was confirmed even in polar base fluid.
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页码：734 / 740
页数：7
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