Material Drying
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Hydrolytic degradation during PBT '2079851475616104452
Problem Phenomenon
When processing PBT, the product color deepens, the viscosity decreases, and the mechanical properties decrease.
Cause Analysis
PBT contains ester bonds and is sensitive to moisture; at the processing temperature (>230°C), moisture triggers hydrolysis and molecular chains break.
Solution
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.
Key Takeaway
PBT hydrolytic degradation can be prevented by sufficient drying and temperature control.
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