This invention belongs to the field of polymer materials technology, and specifically relates to a dyeing method for poly(p-phenylene benzobisoxazole) (PBO) fibers that does not alter their mechanical properties. The dyeing method involves: adding 4,6-diaminoresorcinol hydrochloride, phosphorus pentoxide, terephthalic acid, and phthalocyanine pigment to a reaction vessel containing polyphosphoric acid; gradually increasing the temperature from 45°C to 145°C while stirring to carry out the reaction, thereby obtaining a PBO prepolymer solution; transferring the PBO prepolymer solution to a twin-screw extruder, where high-degree polymerization is completed; and then transferring it to a spinning metering pump to produce high-performance PBO fibers. This invention allows for the dyeing of PBO fibers without damaging their original structure or reducing their mechanical properties.
Country Code: CN
Application Number: CN202311689358.5
