Production & Quality
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PU Product Yellowing After Processing
Fenómeno del problema
PU product surface gradually yellows after 1 week of storage, color difference ΔE>3
Análisis de la causa
Antioxidant system incomplete, thermo-oxidative degradation producing yellow products; UV irradiation accelerating photo-oxidation; residual transition metal catalysts catalyzing oxidation
Solución
1) Improve antioxidant system 1010(0.1)+168(0.1)+DSTDP(0.2)wt%; 2) Add UV absorber 0.2-0.5wt%; 3) Add metal deactivator 0.05wt%; 4) Select low-residue raw material grade
Conclusión clave
Yellowing is caused by thermo/photo-oxidation and metal catalysis; improving antioxidant system and UV absorber is key
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