Polyimide fiber and preparation method thereof
A polyimide fiber and polyamic acid technology, applied in the field of materials, can solve problems such as difficult processing, low mechanical properties of fibers, and high toxicity of solvents
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[0046] The present invention also provides a kind of preparation method of polyimide fiber, comprises the following steps:
[0047] A) polymerizing the dianhydride compound and the diamine compound to obtain a precursor polyamic acid solution;
[0048] B) spinning, imidizing and thermally drawing the precursor polyamic acid solution in sequence to obtain polyimide fibers;
[0049] In the present invention, first, the dianhydride compound and the diamine compound are polymerized to obtain a precursor polyamic acid solution.
[0050] Specifically, the dianhydride compound and the diamine compound are dissolved in a solvent, stirred, and polymerized to obtain a precursor polyamic acid solution. Wherein, the temperature of the polymerization reaction is -10-40° C., and the time of the polymerization reaction is 1-40 h. The molar ratio of the dianhydride compound to the diamine compound is 1:(0.8-1.2), more preferably 1:(0.9-1.1). The solvent is preferably one or more of equipol...
Embodiment 1
[0079] 448.49g (1.0mol) 2,2'-bis(2-hydroxy-4-aminobenzene)-5,5'-biphenyl[1,2-d:1',2'-d']diimidazole, Dissolve in 3800ml N,N-dimethylformamide, add 294.22g (1.0mol) 4,4'-biphenyl dianhydride under stirring, react at -10°C for 24 hours to obtain light yellow viscous polyamic acid spinning Solution, the solution is directly used as spinning slurry after filtration.
[0080] The above-mentioned polyamic acid slurry is spun and formed by dry-jet wet spinning technology, and the spinning slurry at room temperature is accurately measured by a metering pump, and then extruded from the spinneret hole and enters the N,N-dimethyl Dimethylformamide and water (the volume ratio of N,N-dimethylformamide and water is 1:5) coagulation bath. The spinneret has 100 holes, the hole diameter is Φ0.18mm, the spray ratio is 3.2 times, the spinning speed is 50m / min, and the air layer height is 12mm. The as-spun fibers were washed with water and then dried in a hot nitrogen tunnel to obtain polyamic ...
Embodiment 2
[0087] Dissolve 240.27g (1.0mol) of 5-amino-2-(2-hydroxyl-4-aminobenzene)benzimidazole in 3700ml of N,N-dimethylacetamide, and add 294.22g (1.0mol) under stirring 4,4'-biphenyldianhydride, reacted at 30°C for 24 hours to obtain a light yellow viscous polyamic acid spinning solution, which was directly used as spinning slurry after filtration.
[0088] The above-mentioned polyamic acid slurry is spun and formed by dry-jet wet spinning technology, and the spinning slurry at room temperature is accurately measured by a metering pump, and then extruded from the spinneret hole and enters the N,N-dimethyl Dimethylacetamide and water (volume ratio of N,N-dimethylacetamide and water 1:2) coagulation bath. The spinneret has 200 holes, the hole diameter is Φ0.18mm, the spray ratio is 3.8 times, the spinning speed is 60m / min, and the air layer height is 15mm. The as-spun fibers were washed with water and then dried in a hot nitrogen tunnel to obtain polyamic acid fibers.
[0089] The p...
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