Processing Machinery
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Product aging yellowing and discoloration
Fenómeno del problema
The product appears dark yellow to brown, and transparency is significantly reduced
Análisis de la causa
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
Solución
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
Conclusión clave
The thermo-oxidative stability of PEI needs to be guaranteed through a reasonable processing window and additives
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