Preparation method of PIPD (poly[2,6-diimidazo-(4,5-b:4'5'-e)pyridinylene-1,4-(2,5-dihydroxy)phenylene]) fiber
A phenylene pyridine and diimidazole technology, which is applied in the field of high-performance fiber preparation, can solve the problems that PPA cannot be quickly and effectively removed, the control of the draw ratio of the primary filaments is unstable, and the fiber structure and performance are affected. Phosphorus content, the effect of preventing stretching
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Embodiment 1
[0043] A method for preparing poly[2,5-dihydroxy-1,4-phenylene pyridodiimidazole] fibers, comprising the following steps: stretching the PIPD / PPA liquid crystal solution through an air gap, cooling in a quench chamber, and phosphoric acid aqueous solution The poly[2,5-dihydroxy-1,4-phenylenepyrididimidazole] fiber is obtained through the processes of coagulation, washing, multi-stage gradual drying, heat treatment and winding.
Embodiment 2
[0045] A method for preparing poly[2,5-dihydroxy-1,4-phenylene pyridodiimidazole] fibers, comprising the following steps: stretching the PIPD / PPA liquid crystal solution through an air gap, cooling in a quench chamber, and phosphoric acid aqueous solution The poly[2,5-dihydroxy-1,4-phenylenepyrididimidazole] fiber is obtained through the processes of coagulation, washing, multi-stage gradual drying, heat treatment and winding.
[0046] The air gap stretching is as follows: after the PIPD / PPA liquid crystal solution is metered by a metering pump, it is sent to the spinning assembly, and after being extruded from the spinneret, the primary filaments are stretched and oriented in an air gap at a temperature of 180°C. .
Embodiment 3
[0048] A method for preparing poly[2,5-dihydroxy-1,4-phenylene pyridodiimidazole] fibers, comprising the following steps: stretching the PIPD / PPA liquid crystal solution through an air gap, cooling in a quench chamber, and phosphoric acid aqueous solution The poly[2,5-dihydroxy-1,4-phenylenepyrididimidazole] fiber is obtained through the processes of coagulation, washing, multi-stage gradual drying, heat treatment and winding.
[0049] The air gap stretching is as follows: after the PIPD / PPA liquid crystal solution is metered by a metering pump, it is sent into the spinning assembly, and after being extruded from the spinneret, the primary filaments are stretched and oriented in an air gap at a temperature of 200°C. .
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