Processing Machinery
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Poor thermal stability of polyamide (general-purpose nylon) during processing
Fenómeno del problema
The thermal stability of polyamide (general-purpose nylon) during processing is poor, the performance decreases significantly after repeated processing, and the degradation is severe
Análisis de la causa
（1）The antioxidant addition amount is insufficient or the type is improper
（2）The processing temperature is too high (exceeding the 240-280°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
Solución
（1）Increase the antioxidant addition amount
（2）Reduce the processing temperature to a reasonable value of 240-280°C
（3）Reduce the screw speed to reduce shearing
（4）Reduce the regrind proportion to ≤15%
（5）Select antioxidants with good high-temperature stability
Conclusión clave
Thermal stability needs to be addressed from antioxidants and temperature control
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