FEEDSTOCK RECYCLING OF POLYMETHYL METHACRYLATE (PMMA) BY DEPOLYMERISING IN A REACTIVE EXTRUSION PROCESS

摘要

PMMA can be depolymerised by using thermal energy. In the presented process a twin-screw-extruder is used to heat up PMMA beyond depolymerisation temperature. The major advantages are efficient energy input through shear energy and thermal energy. The process can be operated continuously because residues are carried out of the extruder by selfwiping screws. This allows processing contaminated post consumer PMMA as well as PMMA mixed with other polymers. Furthermore the process is accelerated by using additives so the mass throughput of the extrusion process is maximised.