A kind of preparation method of novel warm polyacrylonitrile hollow fiber
A technology of polyacrylonitrile and polyacrylonitrile powder is applied in the manufacture of hollow filaments, chemical characteristics of fibers, melt spinning, etc. It can solve problems such as low cost, improve strength, avoid the use of toxic chemical reagents, and protect ecology. The effect of the environment
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Embodiment 1
[0040] Dry polyacrylonitrile powder (terpolymer, acrylonitrile: methyl acrylate: itaconic acid=93mol%: 5mol%: 2mol%, M η =3×10 4 g / mol), lauryl trimethyl quaternary ammonium chloride salt, and tribasic lead sulfate heat stabilizer are fully mixed with a mass percentage of 15.8%: 79.2%: 5%, and are prepared using a screw extruder , set the temperature of making strips to be 80°C, and then perform pelletizing. The resulting mixture pellets are fed into a large melt spinning machine using e.g. figure 1 The "C" shaped spinneret shown in the figure is spun to obtain a hollow fiber, the spinning temperature is 80°C, and the winding line speed is 100m / min; .% ethanol and 5wt.% methanol in an aqueous mixed bath for extraction and drying to obtain single-hole hollow polyacrylonitrile fibers, such as Figure 6 shown. In a dry state, the strength of the hollow fiber was tested by a universal testing machine to be 13.7 MPa, the inner diameter of the PAN hollow fiber was 20 μm, and th...
Embodiment 2
[0042] The dry polyacrylonitrile powder (terpolymer, acrylonitrile: methyl methacrylate: itaconic acid=90mol%: 5mol%: 5mol%, M η =5×10 4 g / mol), N-ethylpyridinium chloride salt, and basic lead sulfite heat stabilizer are fully mixed with a mass percentage of 38%: 57%: 5%, and the screw extruder is used to make strips, set The temperature for making strips is 300°C, and then pelletized. The resulting mixture pellets are fed into a large melt spinning machine using e.g. figure 1 The "C" shaped spinneret shown in the figure is spun to obtain a hollow fiber, the spinning temperature is 300°C, and the winding line speed is 300m / min; the prepared hollow fiber is placed in a water bath with a temperature of 60°C Extracted from the medium and dried naturally to obtain a single-hole hollow polyacrylonitrile fiber, such as Figure 6 shown. In a dry state, the strength of the hollow fiber is 13.2 MPa when tested by a universal testing machine, the inner diameter of the PAN hollow fi...
Embodiment 3
[0044] Dry polyacrylonitrile powder (terpolymer, 80mol% acrylonitrile: methacrylic acid: itaconic acid=80mol%: 10mol%: 10mol%, M η =1×10 5 g / mol) and N-ethylpyridinium bromide, 1-ethyl-3-methylimidazolium iodide, dibasic lead phosphite heat stabilizer are 30% by mass: 33.3%: 30%: 3.3% Mix well, use a screw extruder to make strips, set the temperature of the strips at 230° C., and then pelletize. The resulting mixture pellets are fed into a large melt spinning machine using e.g. figure 1 The "C" shaped spinneret shown in the figure is spun to obtain a hollow fiber, the spinning temperature is 300°C, and the winding speed is 500m / min; the prepared hollow fiber is 8wt at a temperature of 60°C .% dodecanoic acid aqueous solution, and dry naturally to obtain single-hole hollow polyacrylonitrile fibers, such as Figure 6 shown. In a dry state, the strength of the hollow fiber is 14.8 MPa when tested by a universal testing machine, the inner diameter of the PAN hollow fiber is 3...
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