A RECYLCING METHOD OF POLYOLEFIN AND LIQUID PARAFFIN CONTAINED IN POLYMERIC MEMBRANE OF SECONDARY BATTERY

摘要

The present invention relates to a method for reproducing polyolefin and paraffin from a waste separation membrane for a secondary battery and, more specifically, to a method for reproducing polyolefin and paraffin from a waste separation membrane for a secondary battery, the method comprising the following steps: i) leaving or pressing a waste separation membrane for a secondary battery containing polyolefin and liquid paraffin in a vertical container, thereby partially separating only the liquid paraffin from the waste separation membrane (S020); ii) extruding the waste separation membrane for a secondary battery, from which the liquid paraffin is partially removed, to process the resultant waste separation membrane into pellets (S030); iii) mixing the pellets and stripping liquid to dissolve and disperse the liquid paraffin in the pellets into the stripping liquid (S040); and iv) separating to obtain pellet type polyolefin, the stripping liquid, and the liquid paraffin, separately, through solid-liquid separation (S050). The present invention provides an economical, efficient, and eco-friendly process, capable of separating liquid paraffin and polyolefin components at high purity, respectively, from separation membrane scraps and defective separation membranes generated during a manufacturing procedure of a secondary battery.