Processing Machinery
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Cellulose acetate butyrate has poor thermal stability during processing
Problem Phenomenon
Cellulose acetate butyrate has poor thermal stability during processing, performance significantly decreases after repeated processing, severe degradation
Cause Analysis
Antioxidant addition amount insufficient or type improper
Processing temperature too high (exceeding the upper limit of 170-230°C), accelerating degradation
Excessive screw shear accelerates thermal-oxidative degradation
Regrind ratio too high, degradation accumulation
Antioxidant fails at high temperature
Solution
Increase antioxidant addition amount
Lower the processing temperature to a reasonable value of 170-230°C
Lower the screw speed to reduce shear
Reduce the regrind ratio ≤15%
Select antioxidants with good high-temperature stability
Key Takeaway
Thermal stability needs to be addressed from antioxidants and temperature control
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