Preparation method of polyacrylonitrile-based carbon nanofibers
A nano-carbon fiber and polyacrylonitrile-based technology, which is applied in fiber processing, fiber chemical characteristics, dry spinning, etc., can solve the problems of low spinning efficiency and few large-scale production equipment, and achieve good crystal morphology and fiber diameter The effect of thin and short production cycle
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[0023] A kind of preparation method of carbon nanofiber disclosed by the present invention (abbreviation preparation method, see figure 1 ), the process steps are as follows: polyacrylonitrile is dissolved in a solvent to form a spinning solution, and then the spinning solution is supplied to the spinning die 2 containing a series of spinneret holes through a supply device, so that the spinning solution flows from the spinning Extrude from the spinneret hole 21 of the die head 2 to form a thin stream of spinning solution; at the same time, at least one high-speed jet stream enters the spinner die head 2, and passes through the air gap 12 of the spinner die head 2 at a temperature of 0-30 degrees. The jet angle blows to the fine stream of the extruded spinning solution; the high-speed jet airflow realizes the stretching and refinement of the thin stream of the spinning solution, and at the same time accelerates the volatilization of the solvent in the spinning solution to form p...
Embodiment 1
[0031] (1) Preparation of spinning solution: dissolve polyacrylonitrile with a viscosity-average molecular weight of 90,000 into N,N-dimethylformamide at a mass fraction of 12%, and stir until uniformly mixed to prepare a spinning solution;
[0032] (2) Preparation of polyacrylonitrile nanofibers by solution jet spinning method: the spinning solution is supplied to the spinneret 2 through a metering pump at a rate of 12mL / h / spinning hole, so that the spinning solution flows from the spinneret 2 Extruded in the spinneret hole 21 to form a thin stream of spinning solution; at the same time, two high-speed jets with a temperature of 40°C are blown to the thin stream of the extruded spinning solution through the air gap 12 at a jet angle of 30°, and the air velocity is controlled 800 times the extrusion speed of the solution stream, the high-speed airflow stretches the solution stream and promotes the volatilization of the solvent to form polyacrylonitrile nanofibers;
[0033] (3)...
Embodiment 2
[0037] (1) Preparation of spinning solution: dissolve polyacrylonitrile with a viscosity-average molecular weight of 120,000 into N,N-dimethylacetamide at a ratio of 10% by mass fraction, stir until uniformly mixed, and prepare spinning solution;
[0038] (2) Preparation of polyacrylonitrile nanofibers by solution jet spinning: the spinning solution is supplied to the spinneret die 2 through a metering pump at a rate of 22mL / h / spinning hole, so that the spinning solution flows from the spinneret die 2 Extruded in the spinneret holes 21 to form a fine stream of spinning solution; at the same time, two high-speed jet streams with a temperature of 50°C are blown to the thin stream of the extruded spinning solution through the air gap 12 at an injection angle of 15°, and the air velocity is controlled 1200 times the extrusion speed of the solution stream, the high-speed airflow stretches the solution stream and promotes the volatilization of the solvent to form polyacrylonitrile na...
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