Material Drying
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PBT drying 110-120℃×3h
Problem Phenomenon
PBT products show silver streaks, bubbles, darkened color, surface spots, and decreased mechanical properties
Cause Analysis
Although PBT has low moisture absorption, it is sensitive to moisture at high temperatures: residual moisture in the 250-270℃ melt hydrolyzes ester bonds and degrades molecules, manifested as darkened color, surface spots and performance deterioration
Solution
①Dehumidifying drying at 110-120℃×3 hours; ②reduce moisture content to below 0.02%; ③sealed storage after drying and use within a limited time; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT drying is the precondition for its high-temperature processing; 110-120℃×3h is the standard specification of manufacturers such as Polyplastics, and hydrolysis damage is irreversible; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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