The Research On Dispersion Of Sb Nanoparticles In Lubricating Oil

Antimony (Sb) nanoparticles with different particle sizes were prepared by electrochemical method while the particles surface was modified by surfactant OP-10(octyl phenol polyoxyethylene ether). The modified antimony nanoparticles were dispersed in different base oils, and their dispersion stability was studied by the steady-state sedimentation experiment and absorption test experiment. The effect of particle size and the type of base oils on the dispersion stability of antimony nanoparticles were evaluated and the dispersion mechanism was also discussed. The main conclusions were obtained as following:1. Antimony nanoparticles with different sizes were prepared by electrochemical method by means of changing the electrolysis time while the other experimental conditions remained unchanged. The particles were characterized by means of TEM, XRD and FT-IR. The results showed that the size of antimony nanoparticles became larger and antimony nanoparticles agglomerated to a certain degree with increasing of reaction time. The lipophilic long chain alkyl of OP-10was adsorbed on the particles surface to form adsorption layer when the organic compound OP-10was used to modify antimony nanoparticles, which effectively prevented the agglomeration and oxidation between particles.2. The dispersion of antimony nanoparticles with different sizes dispersed in base oil was studied by steady-state sedimentation experiment and absorption test experiment. The results showed that when the addition of antimony particles is0.5%, antimony particles with90nm settled the fastest in L-AN32#oil and the absorbance of the measured suspension was maximum, the dispersion effect of particles was the worst; the second was the antimony particles with35nm; antimony particles with15nm settled the slowest in L-AN32#oil and the absorbance of the measured suspension was the smallest, the dispersion effect of particles was the best.3. The effect of base oil liquid paraffin, L-HL22#hydraulic oil and L-AN32#oil on the dispersion of antimony suspension was inspected. The results showed that the dispersion stability of antimony nanoparticles was significantly affected by the type of base oil. The setting velocity of particles in suspension slowed down and the absorbance of the measured suspension increased with the increasing of base oil viscosity, which improved the dispersion stability of particles in suspension. The dispersion stability of particles was the worst when liquid paraffin was used as base oil; the second was L-HL22#hydraulic oil; the dispersion stability of particles was the best when L-AN32#oil was used as base oil.