Processing Machinery
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Poor thermal stability of methyl methacrylate-butadiene-styrene copolymer during processing
Problem Phenomenon
Methyl methacrylate-butadiene-styrene copolymer has poor thermal stability during processing; performance decreases significantly after repeated processing, with severe degradation
Cause Analysis
Insufficient antioxidant addition or improper type
Processing temperature too high (exceeding the 180-220°C upper limit) accelerates degradation
Excessive screw shear accelerates thermo-oxidative degradation
Regrind ratio too high, degradation accumulates
Antioxidants fail at high temperature
Solution
Increase antioxidant addition amount
Reduce processing temperature to a reasonable value of 180-220°C
Reduce screw rotation speed to reduce shear
Reduce regrind ratio ≤15%
Select antioxidants with good high-temperature stability
Key Takeaway
Thermal stability needs to start from antioxidants and temperature control
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