Polyacrylonitrile-based hollow carbon fiber precursor preparation method
A technology based on carbon fiber precursors and polyacrylonitrile, which is applied in the manufacture of hollow filaments, rayon, and chemical characteristics of fibers. The problem of silk and other problems can be achieved, and the effect of large hollowness, small outer diameter and good stability can be achieved
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Embodiment 1
[0041] A. According to the mass ratio of 98.8% acrylonitrile and 1.2% itaconic acid, put comonomer into the polymer kettle, then add solvent dimethyl sulfoxide (DMSO), control the mass concentration of monomer acrylonitrile in the polymerization system 22%, add initiator azobisisobutyronitrile (AIBN), the molar ratio of it and itaconic acid is 0.25: 99.75, react at a temperature of 60 ℃ for 24 hours, the polymer obtained is through de-monolysis and degassing, Made into spinning solution.
[0042] B. Conventionally extrude the spinning solution at 60°C±2°C, pass through a candle-shaped filter, and pass through a double C-shaped circular arc slit spinneret (the outer diameter of the spinneret hole is 480 μm, and the inner diameter of the spinneret hole is 320 μm) , the width at the center of the slit gap is the same as the width of the slit, and the number of holes is 94), the primary fiber is sprayed out, the coagulation draft is controlled at 0.7 times, and it is solidified in...
Embodiment 2
[0047] A, by mass ratio 94.3% acrylonitrile, 3.2% methyl acrylate and 2.5% itaconic acid, drop into comonomer in polymer still, add solvent dimethyl sulfoxide (DMSO) again, control monomer acrylonitrile The mass concentration of the polymerization system is 22%, adding the initiator azobisisobutyronitrile (AIBN), the molar ratio of it and itaconic acid is 0.25: 99.75, reacting at a temperature of 60° C. for 24 hours, and the polymer obtained by Single-degassing and degassing to make spinning solution.
[0048] B. The spinning solution is routinely extruded at 60°C ± 2°C, through a candle filter, from the double C-shaped circular arc slit spinneret (same as described in Example 1), the as-spun fibers are ejected and solidified The stretching is controlled at 0.8 times, and it enters into a coagulation bath with a temperature of 30°C±2°C for coagulation and molding, and the coagulation bath is the same as in Example 1.
[0049] C. According to step C of Example 1, polyacrylonit...
Embodiment 3
[0053] A, spinning solution preparation is the same as embodiment 1.
[0054] B. Conventionally extrude the spinning solution at 60°C±2°C, pass through a candle-shaped filter, and pass through a single C-shaped circular arc slit spinneret (the outer diameter of the spinneret hole is 480 μm, and the inner diameter of the spinneret hole is 320 μm) , the width at the center of the slit gap is the same as the width of the slit, and the number of holes is 94.), the primary fiber is sprayed out, the coagulation draft is controlled at 0.8 times, and it is coagulated into a coagulation bath with a temperature of 25 ° C ± 2 ° C. The coagulation bath is the same as Example 1.
[0055] C. After pre-drawing with hot water at 100°C, washing with water, drying, and then drawing with water vapor at 120°C, the total drafting of the two times is controlled at 12 times, and the polyacrylonitrile-based hollow carbon fiber precursor is obtained through heat setting.
[0056] The obtained hollow ...
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