Material Drying
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PC drying 0.02% red line
Problem Phenomenon
PC products show silver streaks and bubbles, impact strength drops significantly, and the fracture surface is brittle
Cause Analysis
PC moisture absorption rate can reach 0.15%; residual moisture in the pellets vaporizes in the 260-320℃ melt and catalyzes hydrolysis; molecular weight decreases after molecular chain scission, manifested as surface silver streaks and mechanical property deterioration
Solution
①Dehumidifying drying at 110-120℃×3-4 hours, moisture content reduced to below 0.02%; ②Sealed storage after drying, used up within 2 hours; ③Use TVI method or moisture meter to verify drying effect
Key Takeaway
PC is a typical hydrolysis-sensitive material, and 0.02% moisture content is the industry-recognized red line; sufficient drying is the only fundamental means to avoid silver streaks and brittle fracture；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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