Extrusion & Post
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PAN spinning solution gelation
Problem Phenomenon
PAN solution locally gels during storage or spinning and loses spinnability
Cause Analysis
Temperature fluctuations cause PAN crystallization and physical crosslinking; the solvent system (such as DMSO/DMF/NaSCN aqueous solution) has reduced dissolving ability for PAN; PAN concentration too high
Solution
Strictly control the spinning solution temperature at 60-80°C; select suitable solvent concentration and PAN content (usually 15-25%); filter to remove gel particles
Key Takeaway
Gelation of PAN solution is the main process risk in carbon fiber precursor spinning
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