Laxative
Inspired Ionic Liquid Lubricants with Good
Detergency and No Corrosion
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Abstract
1-Alkyl-3-methylimidazolium
bis(2-ethylhexyl)sulfosuccinate (L-DOSS10n, <i>n</i> = 2,
4, 8) ionic liquids (ILs) were synthesized from dioctyl
sodium sulfosuccinate (NaDOSS), which is a cheap, bulk available laxative
medicine used for the treatment of constipation. The ILs showed lower
corrosion levels and higher hydrolysis stabilities than conventional
ILs such as 1-butyl-3-methyl imidazolium tetrafluoroborate (L-B104)
and 1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)imide
(L-F104) due to their halogen-free characteristic. The tribological
properties of the ILs were also better than those of L-B104 and L-F104
for various contacts. Thus, they can be used as replacements for conventional
IL lubricants, which may solve the problems of corrosion and high
cost to put conventional IL lubricants into industrial application.
Coking test results indicated that the synthesized ILs have high deterging
ability. Thus, these ILs may be used as lubricants that restrain carbonaceous
deposition as well as oil sludge and varnish formation on the metal
contacts during the sliding process. Moreover, the synthesized ILs
can disperse, loosen, and remove the already formed harmful substances
and keep the metal contacts clean