Processing Machinery
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PBAT degradation yellowing
Problem Phenomenon
PBAT yellows and discolors during processing or use, due to thermal-oxidative aging and degradation.
Cause Analysis
PBAT thermal stability is limited; processing temperature too high; residence time too long; antioxidant insufficient; ultraviolet irradiation.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize processing temperature; ②shorten residence time; ③add antioxidant; ④store away from light; ⑤select stabilized grades.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Heat management and stabilization are equally important for PBAT yellowing; antioxidant is a necessary formulation component; storage conditions affect service life.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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