Processing Machinery
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Product aging yellowing and discoloration
Problem Phenomenon
The product appears dark yellow to brown, and transparency is significantly reduced
Cause Analysis
Processing temperature exceeds the safe upper limit (>400°C), thermo-oxidative degradation occurs generating chromophoric groups; material stays in the barrel too long; heat stabilizer system insufficient
Solution
Control the processing window of melt temperature at 350-390°C; shorten residence time to <5 minutes; increase the proportion of antioxidants and heat stabilizers
Key Takeaway
The thermo-oxidative stability of PEI needs to be guaranteed through a reasonable processing window and additives
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