Electret nanofibrous web
A nanofiber mesh, electret technology, applied in fiber processing, separation methods, filtration separation, etc., can solve the problems of complexity, increased thickness and weight, fragility, etc.
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Embodiment 1
[0114] use as image 3 The apparatus shown produces continuous fibers from a spinning bowl made from a low molecular weight (Mw) polypropylene (PP) homopolymer (Metocene MF650Y from LyondellBasell). It has Mw = 75,381 g / mol, melt flow rate = 1800 g / 10 min (230°C / 2.16 kg), and a zero shear viscosity of 9.07 Pa·S at 200°C. A PRISM extruder with a gear pump was used to deliver the polymer melt through a feed tube to a rotating spinning bowl. The temperature of the spinning melt from the melt supply pipe was set at 200°C and the melt feed rate was 18.14 g / min. The temperature at the edge of the spinning bowl was estimated to be about 200°C. The heating air in the stretching zone was set at 250°C. The shaping air was set at 150°C. The rotation speed of the spinning disc was set at a constant 10,000 rpm. The spin attachment temperature was 47°C and the humidity was 11%. Dual high charge voltages were set at +51kV and 0.25mA on the collector belt and -7.5kV and 0.40mA on the co...
Embodiment 2
[0117] Example 2 was prepared under similar conditions to Example 1 with the following modifications: the temperature at the edge of the spinning bowl was estimated to be about 210°C; the spin attachment temperature was 45°C and the humidity was 12%; +52kV and 0.28mA on the corona ring and -7.5kV and 0.45mA on the corona ring.
[0118] Fiber size was measured from the images using scanning electron microscopy (SEM), and the fibers were determined to have mean and median fiber diameters of 510 nm and 340 nm, respectively, for the total fibers measured. There were 87.91% nanofibers with mean = 370 nm and median = 310 nm, 11.94% microfibrils with mean = 1.48 μm and median = 1.30 μm, 0.15% coarse fibers with mean = 7.09 μm and median = 7.64 μm. The electrostatic charge held on the nanofiber web was -13.8 kV. Other specific data of fiber web properties are shown in Table 1 and Table 2.
Embodiment 3
[0120] Example 3 was prepared under similar conditions to Example 1 with the following modifications: the temperature at the edge of the spinning bowl was estimated to be about 215°C; the spin attachment temperature was 41°C and the humidity was 14%; +51kV and 0.23mA on the corona ring and -7.5kV and 0.44mA on the corona ring.
[0121] Fiber size was measured from the images using scanning electron microscopy (SEM), and the fibers were determined to have mean and median fiber diameters of 500 nm and 320 nm, respectively, for the total fibers measured. There were 91.06% nanofibers with mean = 350 nm and median = 290 nm, 8.72% microfibrils with mean = 2.22 μm and median = 1.62 μm, 0.22% coarse fibers with mean = 6.56 μm and median = 1.92 μm. The electrostatic charge maintained on the web was -12.2 kV. Other specific data of fiber web properties are shown in Table 1 and Table 2.
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