Preparation and Low-Temperature Performance of Silicone Oil Based Magnetic Fluid Hydraulic Medium

With the development of hydraulic transmission technology and the increasingly harsh working environment of equipment, the hydraulic medium is developing towards the direction of low temperature and intelligence. As a kind of intelligent fluid, magnetic fluid has a good development prospect for hydraulic medium, but its low temperature performance has not been studied. In this paper, We modified Zn0.5Ni0.5Fe2O4 nanoparticles with silane coupling agent to prepare a new type of silicone oil-based magnetic fluid hydraulic medium, and studied its low-temperature performance. The results show that compared with lauric acid and oleic acid, the silicon-based magnetic fluid prepared with silane coupling agent has better stability at low temperature and still maintains excellent dispersion at −50 ℃. The new silicone oil-based magnetic fluid has excellent low temperature properties, including high viscosity index and low pour point. In addition to excellent viscosity temperature properties, the magnetic field can maintain viscosity control in a wide temperature range. This new silicon based magnetic fluid has been proved to be suitable for low temperature hydraulic medium.