Processing Machinery
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Poor Thermal Stability of polyamide 6 (nylon 6) During Processing
Problem Phenomenon
The thermal stability of polyamide 6 (nylon 6) during processing is poor, with significant performance decline and severe degradation after repeated processing
Cause Analysis
The amount of antioxidant added is insufficient or the type is improper
The processing temperature is too high (exceeding the upper limit of 230-270°C), accelerating degradation
Excessive screw shear accelerates thermal oxidative degradation
The regrind ratio is too high, and degradation accumulates
The antioxidant fails at high temperature
Solution
Increase the amount of antioxidant
Reduce the processing temperature to a reasonable value of 230-270°C
Reduce the screw speed to reduce shear
Reduce the regrind ratio to ≤15%
Select an antioxidant with good high-temperature stability
Key Takeaway
Thermal stability needs to be addressed from the antioxidant and temperature control
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