Method for manufacturing wholly aromatic liquid-crystalline polyester fiber with enhanced spinnability

A method for manufacturing a wholly aromatic liquid-crystalline polyester fiber comprising:

• performing acetylation reaction by stirring raw material monomers including hydroxy benzoic acid, hydroxy naphthoic acid, biphenol, terephthalic acid, and isophthalic acid, and adding a reactive solvent thereto together with an organic catalyst or an inorganic catalyst (Step A);
• manufacturing a prepolymer by heating to perform an esterification reaction and polycondensation after performing the acetylation reaction (Step B);
• manufacturing a polyester resin by solid-phase polycondensation of the prepolymer (Step C);
• manufacturing wholly aromatic liquid-crystalline polyester resin pellets by extruding the polyester resin (Step D);
• manufacturing a wholly aromatic liquid-crystalline polyester fiber by melt-spinning the pellets (Step E);
• and
• heat-treating the fiber through a plurality of heating steps (Step F),
• wherein in Step A, 1.08 equivalent to 1.12 equivalents of acetic anhydride is added as the reactive solvent.