Material Drying
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Hydrolysis reaction of PA during processing or use
Problem Phenomenon
Hydrolysis reaction of PA occurs during processing or use, the molecular chains break, and the mechanical properties decrease significantly
Cause Analysis
（1）The raw material moisture content exceeds the standard and the hydrolysis reaction accelerates at high temperature
（2）PA is extremely prone to hydrolysis in high-temperature and high-humidity environments
（3）The processing temperature is high (240-280°C) and hydrolysis is severe when moisture is present
（4）Use environments with long-term hot water immersion
（5）PA66 has higher hydrolysis sensitivity than PA6
Solution
（1）Strictly control the raw material moisture content ≤0.02%
（2）Fully dry according to the conditions of 80-100°C/6-12h
（3）Avoid high-temperature and high-humidity processing environments
（4）Select hydrolysis-resistant PA varieties for hot water use environments
（5）PA66 requires stricter drying
Key Takeaway
PA hydrolysis requires strict drying and temperature control
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