COMPLEX PLASTIC COMPOSITION FOR INJECTION HAVING FUNCTION OF ABSORBING ELECTROMAGNETIC WAVE

摘要

PURPOSE: Provided is a complex plastic composition for injection having function of absorbing an electromagnetic wave, which can effectively absorb an electromagnetic wave generated in electronic instrument, when housing of the electronic instrument is injected through the complex plastic composition. CONSTITUTION: The composition is prepared by uniformly mixing 5-15 vol% of Ni-Zn ferrite powder or Mn-Zn ferrite into 85-95 vol% of polycarbonate matrix. The ferrite powder has a size of 150-200 mesh. The size of powder is controlled by various milling processes. Also, the ferrite preferably has a shape of flake so as to have a high aspect ratio. The Ni-Zn ferrite is synthesized by mixing 10 mol% of NiO(99.97%), 25 mol% of ZnO(99.999%), and 60 mol% of FeO3(99.99%). The ferrite powder and polycarbonate material are uniformly mixed by using HAAKE Polyab system.