Processing Machinery
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Poor thermal stability of polyamide 12 (long carbon chain nylon) during processing
Problem Phenomenon
The thermal stability of polyamide 12 (long carbon chain nylon) during processing is poor, the performance decreases significantly after repeated processing, and the degradation is severe
Cause Analysis
（1）The antioxidant addition amount is insufficient or the type is improper
（2）The processing temperature is too high (exceeding the 190-230°C upper limit), accelerating degradation
（3）Excessive screw shearing accelerates thermal-oxidative degradation
（4）The regrind proportion is too high and degradation accumulates
（5）The antioxidant fails at high temperature
Solution
（1）Increase the antioxidant addition amount
（2）Reduce the processing temperature to a reasonable value of 190-230°C
（3）Reduce the screw speed to reduce shearing
（4）Reduce the regrind proportion to ≤15%
（5）Select antioxidants with good high-temperature stability
Key Takeaway
Thermal stability needs to be addressed from antioxidants and temperature control
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