Surface Modification Of Marine Lubricating Oil Additives By Plasma Assisted Ball Milling

In this paper,ionic surfactant?sodium laurate+cetyl trimethyl ammonium bromide?CTAB?,benzoyl peroxide + polystyrene?and non-ionic surfactant?stearic acid,oleic acid?was respectively selected on TiO₂ and Zn O of oxide additives for ball mill;respectively select sodium laurate + CTAB,stearic acid on Cu,Fe of metal powder for ball mill.The powder prepared separately morphology and particle size measurements,gravity sedimentation experiment,lipophilic degree,s testing.The powder prepared by FI-IR and thermo-gravimetric experiment and XPS test,analysis of different surface modification agent on the powder surface modification mechanism.The morphology of powders prepared by ball milling was observed,the results show:Using plasma-assisted milling process,can effectively refine the oxide powders and metal powders.Within ten hours after the ball milling,the particle size of the oxide powder?Ti O₂?Zn O?is less than 200 nm,the particle size of the metal powder?Fe?Cu?is within 300 nm,the prepared powders show a loose aggregation state,shape rules,and the morphology is very good.Based on marine lubricating oil as base oil,the results obtained by gravity sedimentation test are carried out: the oxide particles?Ti O₂?Zn O?modified with stearic acid and oleic acid were better dispersed and stable than the ionic type modifier.Lipophilic degree tests showed that: stearic acid-TiO₂,oleic acid-TiO₂ lipophilic degree respectively 62.12% and 60.93%,higher than 48.45% of the sodium laurate+CTAB-TiO₂,benzoyl peroxide + polystyrene-TiO₂ 46.58%;stearic acid-ZnO,oleic acid-ZnO lipophilic degree are 52.47% and 53.7%,higher than 46.4% of the sodium laurate+CTAB-ZnO and 44.2% of the benzoyl peroxide + polystyrene-ZnO.By infrared spectroscopy and thermal gravimetric analysis and XPS analysis,with the modification of stearic acid and oleic acid,nano TiO₂ and ZnO powder was made an esterification,produced the new chemical bond –COOR and came into being a steady modified layer.sodium laurate+CTAB and nano oxides are in the same reaction,CTAB was adsorbed the surface of the oxide powder which was wrapped with sodium laurate by the intermolecular force.Benzoyl peroxide and polystyrene can not make a chemical reactions on nano powdersurface,but it can absorb on the surface of the nano-particles through intermolecular force.The dispersion stability of metal powder?Cu?Fe?modified by sodium laurate +CTAB was better than modified by stearic acid in Marine lubricating oil 5040,but they both apeared stratification phenomenon after stewing for 20 days.The lipophilic degree of sodium laurate+CTAB-Fe was 43.56%,and the lipophilic degree of stearic acid-Fe was 40.3%;The lipophilic degree of sodium laurate+CTAB-Cu was 42.6%,which are greater than that of the stearic acid-Cu 38.7%.By FI-IR spectroscopy and thermogravimetric analysis,the metal Cu,Fe particles and stearic acid were combined by the intermolecular forces.Cu,Fe particles and sodium laurate and CTAB was combined by intermolecular force and the adsorption of electron pair coordination.The metal Cu,Fe particles and modified agent can not inform a chemical reaction.