Abstract: Oil-based Fe3O4 magnetic fluid was prepared using FeCl3·6H2O and FeCl2·4H2O by chemical coprecipitation method and the process route was chosen to overcome the agglomeration difficulty of magnetic particles in the synthesis process of Fe3O4 magnetic fluid. The magnetic fluid had good dispersion and stability, and its saturation magnetization was up to 72.60 emu/g. P(St-GMA-DVB) polymer magnetic microspheres were synthesized by suspension polymerization method. The stirring speed had greater impact on magnetic microsphere particle size, and the magnetic microsphere particles were in the range of 55~300 mm. The appearance of magnetic microsphere was monodisperse spherical, and the content of epoxide could be achieved 17 mmol/g.

Key words: chemical coprecipitation, oil-based magnetic fluid, suspension polymerization, polymer magnetic microspheres

摘要： 以FeCl3×6H2O和FeCl2×4H2O为原料，采用化学共沉淀法制备了Fe3O4油基磁流体，设计的合成工艺克服了合成磁流体过程中Fe3O4磁性粒子易团聚的缺点，合成了具有很好分散性和稳定性的磁流体，比饱和磁化强度达72.60 emu/g. 采用悬浮聚合方法合成了聚苯乙烯-甲基丙烯酸缩水甘油酯-二乙烯基苯[P(St-GMA-DVB)]高分子磁性微球，搅拌转速对磁性微球粒径影响大，磁性微球粒径在55~300 mm范围内，外形为具有单分散性的球形，表面环氧基团含量达17 mmol/g.

关键词: 化学共沉淀, 油基磁流体, 悬浮聚合, 高分子磁性微球