Material Drying
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PA6 Hydrolysis Aging
Fenómeno do problema
PA6 coolant pipes embrittle and crack after two years of use in hot water and antifreeze environments
Análise das causas
PA6 amide bonds hydrolyze in high-temperature water and ethylene glycol environments, and the continuous molecular weight decline causes embrittlement, with the hydrolysis rate roughly doubling for every 10°C temperature increase; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solução
Select hydrolysis-resistant grades for hot water medium environments or switch to high-temperature nylon such as PPA; water-contact parts with working temperature over 70°C must undergo long-term hydrolysis verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
High-temperature water contact is a sensitive service condition for PA6, and hydrolysis-resistant grades are a necessary choice; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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