Extrusion & Post
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COC and PC Blending Delamination
Problem Phenomenon
After COC is blended with other resins or mixed with recycled material, the product shows delamination and peeling, the interlayer strength is low, and layered textures are visible on the appearance.
Cause Analysis
COC has poor compatibility with most resins, and the large difference in molecular polarity leads to weak interfacial bonding; recycled runner material mixed with foreign resins forms macroscopic delamination; differences in shear history aggravate phase separation.
Solution
①Strictly isolate recycled material to prevent foreign resin mixing; ②when blending is necessary, add a compatibilizer and verify by tests; ③purge the machine thoroughly to replace the previous material; ④perform interfacial microscopic analysis on delaminated parts for traceability.
Key Takeaway
COC's poor blending compatibility is the nature of the material; recycled material isolation management is the first line of defense; compatibilizer schemes must be verified by experiments and cannot be taken for granted.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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