Material Drying
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PBAT hydrolysis and short shelf life
Problem Phenomenon
The performance of PBAT products rapidly declines during storage or use, tensile strength decreases, and the shelf life is shorter than expected.
Cause Analysis
PBAT molecular chains contain water-sensitive ester groups, and terminal carboxyl groups easily bind with water; the higher the terminal carboxyl content, the faster the hydrolysis rate; high storage environment humidity accelerates hydrolysis; processing heat history consumes molecular weight.
Solution
①Select PBAT resin with low terminal carboxyl content; ②sealed packaging for moisture protection; ③control storage environment humidity; ④optimize processing temperature to reduce heat history; ⑤add anti-hydrolysis agent.
Key Takeaway
PBAT hydrolysis is an inherent weakness of ester-based materials; terminal carboxyl content is a core quality indicator; moisture-proof management runs through storage and use.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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