Material Analysis
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PBAT poor filler compatibility
Problem Phenomenon
PBAT has poor compatibility with inorganic fillers such as calcium carbonate and talc; after the addition amount exceeds 15%, strength and heat sealability seriously decline.
Cause Analysis
Large surface energy difference between PBAT polar ester groups and inorganic fillers; filler agglomeration and uneven dispersion; weak interfacial bonding and poor stress transfer; defect probability increases at high addition amounts.
Solution
①Filler surface coupling agent modification to improve compatibility; ②dispersion process optimization; ③control the addition amount within 15%; ④develop new compatible fillers.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBAT filler compatibility is the core of modification technology; coupling agent modification is the standard method; the 15% upper limit is the performance guarantee line.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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