Processing Machinery
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Poor thermal stability of styrene-butadiene copolymer during processing
Problem Phenomenon
Styrene-butadiene copolymer has poor thermal stability during processing; after repeated processing, performance declines obviously and degradation is severe
Cause Analysis
Antioxidant addition amount is insufficient or the type is improper
Processing temperature is on the high side (exceeding the 180-220°C upper limit), accelerating degradation
Excessive screw shear accelerates thermal-oxidative degradation
The regrind proportion is too high and degradation accumulates
Antioxidants fail at high temperature
Solution
Increase antioxidant addition amount
Reduce processing temperature to a reasonable value within 180-220°C
Reduce screw speed to reduce shear
Reduce the regrind proportion to ≤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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