Preparation method of fiber-reinforced aromatic polyamide hollow fiber membrane and hollow fiber membrane prepared by preparation method
A technology of aromatic polyamide and fiber reinforcement, applied in the direction of single-component polyamide rayon, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problems of consuming many PPTA fibers and high cost of film production, and achieve uniform reinforcement effect The effects of symmetry, chemical resistance and hydrophilicity are outstanding, and the preparation process is simple
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Embodiment 1
[0032](1) Preparation of PPTA casting solution: 2.5wt% PPTA, 15wt% porogen polyethylene glycol (molecular weight 2000) and 1.5wt% average particle size 300nm hydrophilic silica are mixed and dissolved In concentrated sulfuric acid (98wt%) (the content of concentrated sulfuric acid in the casting solution is 81wt%), stirring and dissolving at 80° C. for 4 hours until uniformly mixed, and after vacuum degassing, the PPTA casting solution is obtained.
[0033] (2) Under the action of 0.3MPa air pressure, the PPTA film casting solution is quantitatively injected into the hollow spinneret through the filter screen and the metering pump;
[0034] (3) While the casting solution enters the hollow spinneret, three strands of PPTA continuous fibers with a diameter of about 220D (134 single fibers) are dipped in concentrated sulfuric acid (98wt%) for 0.5 seconds, The equidistant positions on the section enter the hollow spinneret and compound with the casting liquid. Under the action of ...
Embodiment 2
[0041] (1) Preparation of PPTA casting solution: the composite porogen polyethylene glycol (molecular weight 2000) and polyvinylpyrrolidone (molecular weight 58000) (polyethylene glycol / polyethylene Pyrrolidone=10 / 1), 0.5wt% average particle size of 300nm hydrophilic silica mixed and dissolved in concentrated sulfuric acid (the content of concentrated sulfuric acid in the casting solution is 85wt%), stirred and dissolved at 80°C for 4 hours until mixed Evenly, after vacuum degassing, the PPTA casting solution is obtained.
[0042] (2) Under the action of 0.3MPa air pressure, the PPTA film casting solution is quantitatively injected into the hollow spinneret through the filter screen and the metering pump;
[0043] (3) While the casting solution enters the hollow spinneret, three bundles of PPTA continuous fibers with a diameter of about 400D (134 single fibers) are dipped in concentrated sulfuric acid (98wt%) for 2 seconds, and then flow along the spinneret channel. The equid...
Embodiment 3
[0048] (1) Preparation of PPTA casting solution: the composite porogen polyethylene glycol (molecular weight 2000) and polyvinylpyrrolidone (molecular weight 58000) (polyethylene glycol / polyvinylpyrrolidone) (polyethylene glycol / polyvinylpyrrolidone) =10 / 3), 1wt% average particle size 300nm hydrophilic silicon dioxide is mixed and dissolved in concentrated sulfuric acid (the content of concentrated sulfuric acid in the casting solution is 81wt%), stirring and dissolving at 80°C for 4 hours to mix evenly, After vacuum defoaming, the PPTA casting solution is obtained.
[0049] (2) Under the action of 0.3MPa air pressure, the PPTA film casting solution is quantitatively injected into the hollow spinneret through the filter screen and the metering pump;
[0050] (3) While the casting liquid enters the hollow spinneret, three bundles of PPTA continuous fibers with a diameter of about 300D (60 single fibers) are dipped in concentrated sulfuric acid (98wt%) for 1 second, and then flo...
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