Material Drying
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PA6 Drying Temperature Upper Limit
Fenómeno del problema
After PA6 is dried at 110°C for a long time, the particles turn yellow and the mechanical properties of the products decrease
Análisis de la causa
When the PA6 drying temperature exceeds 100°C and the time is too long, thermal oxidation occurs on the particle surface, the terminal amino groups are oxidized and discolored, and the molecular chains are partially degraded, manifested as yellowing and decreased strength and toughness
Solución
PA6 dehumidifying drying temperature is controlled at 80-100°C, not exceeding 100°C; a drying time of 4-6 hours is sufficient, avoid high-temperature long-time drying; yellowed particles are downgraded for use or scrapped
Conclusión clave
PA6 drying is not the higher the temperature the better; 80-100°C is the safe range balancing efficiency and oxidation risk; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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