Production & Quality
11 조회수
Yellowing of PVA products after processing
문제 현상
After 1 week of storage, PVA product surface gradually yellows, color difference ΔE>3
원인 분석
Antioxidant system imperfect, thermo-oxidative degradation produces yellow products; ultraviolet irradiation accelerates photo-oxidation; residual transition metal catalysts catalyze oxidation
해결 방법
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
핵심 요약
Yellowing is caused by thermo-photo-oxidation and metal catalysis; improving the antioxidant system and UV absorber are key
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