Material Drying
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TPU hydrolysis degradation
Problem Phenomenon
Product performance declines across the board accompanied by bubbles and silver streaks, and recovers after switching to dry new material.
Cause Analysis
The urethane bonds in TPU undergo hydrolysis and chain breakage when encountering water at high temperature; hydrolysis is an irreversible reaction, and performance cannot be recovered after molecular weight decreases; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①strictly dry to moisture content ≤0.05%; ②re-dry damp material and use it downgraded; ③shorten high-temperature residence time; ④store raw materials sealed; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU hydrolysis is permanent damage; prevention outweighs remedy, and damp material is not recommended for high-performance products; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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