커플링제가 플라스틱 페라이트 자석의 레올로지와 자기특성에 미치는 영향

다국어 초록 (Multilingual Abstract)

Effects of coupling agents on the rheological and magnetic properties of plastic ferrite magnets were investigated. Magnetic powder used was Sr-ferrite, and binder used was polypropylene (PP), and coupling agents used were γ-methacryloxypropyl trimethoxy silane (A174) and isopropyl triisostearoyl titanate (TTS). It was found that the addition of coupling agents to the PP / ferrite system reduced the melt viscosity and increased the magnetic properties considerably, and the treatment with TTS showed greater effect than A174 did. By comparison with that of the untreated one, the apparent viscosities of the mixtures treated with A174 and TTS decreased 23 % and 50 %, respectively, at the shear rate of 1280 sec-¹. Untreated plastic magnets showed remanent flux density (Br) of 1.89 kG and maximum energy product (BHmax) of 0.84 MGOe, and A174 treated magnets showed of Br 2.25 kG and BH(max) of 1.23 MGOe. TTS treated magnets showed Br of 2.35 kG and BH(max) of 1.33 MGOe.