Material Analysis
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Weather resistance of modified polyamide (general-purpose nylon) not up to standard
Fenómeno del problema
The weather resistance of modified polyamide (general-purpose nylon) is not up to standard, with yellowing, embrittlement, or significant performance decline after outdoor use
Análisis de la causa
（1）No ultraviolet absorber is added or the addition amount is insufficient
（2）The antioxidant system is imperfect
（3）The ultraviolet absorber has poor compatibility with polyamide (general-purpose nylon)
（4）The antioxidant is consumed and degraded during processing
（5）Unreasonable formulation design
Solución
（1）Add an appropriate amount of ultraviolet absorber (0.2-0.5%)
（2）Improve the antioxidant system with primary/secondary antioxidant combination
（3）Select a UV absorber with good compatibility
（4）Avoid high-temperature degradation of the antioxidant during processing
（5）Optimize the formulation design
Conclusión clave
Weather resistance needs to be addressed from UV absorbers and antioxidants
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