Injection Molding
13 مشاهدة
Yellowing of PAR '2079851475616104452 due to improper temperature control
ظاهرة المشكلة
The color of PAR products turns yellow and the transparency decreases.
تحليل الأسباب
The processing temperature is too high >320°C or the residence time is long, causing thermal oxidative degradation, and the aromatic structure oxidizes and turns yellow.
الحل
Strictly control the processing temperature at 280-310°C, not exceeding 320°C; shorten the residence time; add antioxidants when necessary.
الخلاصة الأساسية
Although PAR has good thermal stability, strict temperature control is still required.
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