Steigerung der Recyclingraten von gefüllten PA66-Pulvermaterialien für das Laser-Sintern - Akronym: CyclePA66

In laser-based powder bed fusion, aging mechanisms caused by prolonged thermal exposure affect polymers.Therefore, new material is blended with used powder to maintain acceptable component properties and save costs.However, this method is limited for highperformance plastics with high processing temperatures (> 200 °C), like polyetheretherketone (PEEK).Filled polyamide 66 (PA66) compounds with lower processing temperatures, lower service temperatures but comparable mechanical properties represent a promising alternative for aerospace and automotive components.However, PA66 cannot be reliably processed and reused so far due to the degradation of the material properties during processing.Therefore, this study examines processed and artificially aged PA66 powder using a vacuum-drying oven to understand the aging mechanisms during processing.An analysis of the thermal and rheological properties of neat PA66 and filled compounds revealed significantly decreased aging effects at lower storage temperatures and oxygen levels.Furthermore, a novel filled and modified PA66 compound was investigated, balancing thermo-oxidation and post-condensation effects while maintaining high mechanical properties (tensile strength > 70 MPa) when using 50 % recycled material.