Material Drying
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PBT Hydrolysis Resistance Shortcoming
Problem Phenomenon
After being used in a hot and humid environment for a period of time, PBT products' performance drops sharply and they become brittle
Cause Analysis
PBT contains ester bonds; when placed in water above the glass transition temperature, ester bond breakage occurs; the acidic environment formed by hydrolysis self-catalyzes and accelerates the reaction; the terminal carboxyl concentration is the decisive factor of hydrolysis sensitivity
Solution
①For hot and humid environments select hydrolysis-resistant modified grades; ②Add hydrolysis stabilizer carbodiimide; ③Use epoxy functional group additives to block terminal carboxyl groups; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT's poor hydrolysis resistance stems from ester bonds and terminal carboxyl groups; carbodiimide and end-capping technology are the two major modification routes; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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