Material Drying
3 Aufrufe
Hydrolytic degradation during PBT '2079851475616104452
Problembeschreibung
When processing PBT, the product color deepens, the viscosity decreases, and the mechanical properties decrease.
Ursachenanalyse
PBT contains ester bonds and is sensitive to moisture; at the processing temperature (>230°C), moisture triggers hydrolysis and molecular chains break.
Lösung
Fully dry PBT: dry at 120°C for 4-6h to moisture <0.02%; use a dehumidifying dryer with a dew point ≤-30°C; control the barrel residence time.
Wichtigste Erkenntnis
PBT hydrolytic degradation can be prevented by sufficient drying and temperature control.
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!