Processing Machinery
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Poor Thermal Stability of Acrylate-Epoxy-Phosphate-Distyrene Copolymer During Processing
Problem Phenomenon
The acrylate-epoxy-phosphate-distyrene copolymer has poor thermal stability during processing, the performance significantly declines after repeated processing, and the degradation is severe
Cause Analysis
The antioxidant addition amount is insufficient or the type is improper
The processing temperature is too high (exceeding the 200-260°C upper limit), 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 antioxidant addition amount
Reduce the processing temperature to a reasonable value within 200-260°C
Reduce the screw rotation 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 antioxidants and temperature control
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