Molding Process
3 Aufrufe
Yellowing of PC Products
Problembeschreibung
The color of PC transparent products gradually turns yellow.
Ursachenanalyse
The processing temperature is too high (>320°C) or the residence time is too long, causing thermal oxidative degradation and producing colored oxidation products; the raw material antioxidant fails.
Lösung
Strictly control the melt temperature at 270-300°C; shorten the residence time; use high heat-resistant grade PC; supplement antioxidants.
Wichtigste Erkenntnis
PC yellowing is an intuitive manifestation of degradation.
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