Material Drying
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PC drying 0.02% red line
Fenómeno do problema
PC products show silver streaks and bubbles, impact strength drops significantly, and the fracture surface is brittle
Análise das causas
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
Solução
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
Conclusão principal
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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