抄録
In this study, novel functional composite particles which have core-shell type structure were made by using surface modification of fine particles via emulsion coating. Spherical cross-linked particles (core particles) which were mainly composed of methyl methacrylate (MMA) having average diameter of 6.8μm and 9.5μm were fed into a high speed air flow field and aqueous-suspended emulsion (cationic surfactant and PMMA of 150 nm were dispersed together) were sprayed onto the core particles, followed by an instantaneous drying to form fine core-shell structure. As a result, a shell layer of thin film having its thickness of 300 nm and coating efficiency of more than 92.7% could be uniformly formed on the surface of the core particles. It was found that the particle diameter could be controlled by changing the amount of emulsion sprayed. It was also implied that the coating operation using emulsion with high glass transition temperature and positive charge could achieve functional composite particles with improved heat tolerance property and positive charge.
