Material Drying
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PBT poor hydrolysis resistance and performance deterioration
Problem Phenomenon
The strength of PBT products used in hot and humid environments declines rapidly, and cracks appear on the surface.
Cause Analysis
PBT ester bonds hydrolyze and break chains under hot and humid conditions, and molecular weight decreases; poor hydrolysis resistance is an important application limitation of PBT.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Select hydrolysis-resistant modified PBT grades for hot and humid environments; ②add carbodiimide-type anti-hydrolysis agents to block terminal carboxyl groups; ③fully dry before processing to reduce initial moisture; ④conduct hot-humid aging verification.
Key Takeaway
The PBT hydrolysis problem must be solved at the material level; anti-hydrolysis agents and hydrolysis-resistant grades are the standard solution, and the process can only slow it down but not cure it.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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