電磁波シ-ルド材料の連続混練とその評価

概要

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Continuous kneadings were performed under various operation conditions to obtain composite conductive plastics for use as EMI shield matirial. The materials obtained and their kneading state, that is, the dispersion states of fillers in the matrix resin, were evaluated by measuring specific resistivity, shear force acting on the paddles during kneading, mixing Reynolds number and breakage state of fillers. It was found that, where metallized glass fibers were employed as conductive filler, the composite conductive plastics showed useful shielding effectiveness as EMI shield material when the filling ratio of fillers was 3040wt%. The shielding effectiveness could be improved when the matrix resin was sufficiently melted, the breakage of fillers was diminished and the fillers were well dispersed by incrcasing shear force and mixing Reynolds number. As opertion conditions satisfying the states of kneading mentioned above, higher feeding rate, higher kneading temperature and lower speed of rotation of paddles were suggested. Additionally, it was clarified that the stability of shielding effectiveness was guaranteed as the flow pattern of the kneading material approached to perfectly mixed flow by acting axial mixing.
社団法人化学工学会の論文