| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to novel N,N'-tetra-aliphatic hydrocarbyl phenylenediamines of formula (I), which can be used as ash-free TBN sources, and to a crankcase lubricating oil composition. The composition contains a basic amount of oil with viscosity which is suitable for lubrication and not less than 50 wt % of one or more said N,N'-tetra-aliphatic hydrocarbyl phenylenediamines. The invention also relates to a method of lubricating surfaces of a compression ignition internal combustion engine during operation thereof. In formula (I)each of R, R, Rand Ris independently an aliphatic hydrocarbyl group selected from an alkyl group having 3 to 12 carbon atoms, wherein at least one of R, R, Rand Ris an alkyl group, branched in an alpha position to the bonded nitrogen and having 3 to 12 carbon atoms, and at least one of R, R, Rand Ris an alkyl group, branched a beta position to the bonded nitrogen, having 4 to 12 carbon atoms; each Ris independently hydrogen or an aliphatic hydrocarbyl group, selected from an alkyl group having 1 to 12 carbon atoms; and n ranges from 0 to 4. The preferable compounds are N,N'-di-(sec-butyl)-N,N'-di-(2-ethylhexyl)-p-phenylenediamine and N,N'-di(1,3-methylbutyl)-N,N?-di(2-ethylhexyl)-p-phenylenediamine.EFFECT: compositions based on the compound of formula (I) are compatible with fluoroelastomeric sealing materials and satisfy copper plate corrosion test standards.11 cl, 8 tbl, 6 ex |
