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    • 1. 发明公开
    • Process for manufacturing regenerated cellulose hollow fiber
    • Verfahren zur Herstellung von hohlen Fasern aus再生器Zellulose。
    • EP0008536A1
    • 1980-03-05
    • EP79301711.2
    • 1979-08-21
    • MITSUBISHI RAYON CO., LTD.
    • Ishida, MasamichiKamo, JunTakemura, ToruMinami, ShunsukeKamada, Kensuke
    • D01D5/24B01D13/04
    • B01D71/10B01D69/08D01D5/24
    • A regenerated cellulose hollow fiber used as a permeable membrane for dialysis and ultrafiltration, which is prepared by hydrolyzing a cellulose ester hollow fiber and characterized as (a) containing a cellulose II crystal structure at a degree of crystallinity of from 40 to 75%, said cellulose II crystal structure having a degree of crystallite orientation of from 78 to 90% and having a crystallite size of from 60 to 150 angstroms as measured along the fiber axis, and (b) exhibiting a wet strength/wet elongation ratio of from 1.50 to 8.0.
      The regenerated cellulose hollow fiber, of which figure 1A is an X-ray diffraction photograph, is prepared by a process wherein: a dope comprised of cellulose ester in a non-volatile organic solvent is extruded through an annular slit defined between inner and outer tubes of a spinning nozzle having a double tube structure, while a core liquid is forced through the inner tube of said nozzle; the hollow fibrous extrudate is coagulated in a coagulating bath; the coagulated hollowfibr- ous extrudate is drawn 1.05 to 2.00 times its original length; and then, the drawn hollow fiber still containing a core liquid in the hollow is treated with an aqueous caustic alkali solution containing at least 0.5% by weight of water soluble metal salt, thereby hydrolyzing the cellulose ester into cellulose.
    • 一种再生纤维素中空纤维,其用作透析和超滤的渗透膜,其通过水解纤维素酯中空纤维制备,其特征在于(a)含有结晶度为40-75%的纤维素II晶体结构,所述纤维素中空纤维的所述 纤维素II晶体结构,其微晶取向度为78〜90%,沿着纤维轴测得的微晶尺寸为60〜150埃,(b)湿强度/湿伸长率为1.50〜 8.0。 图1A是X射线衍射照片的再生纤维素中空纤维通过以下方法制备,其中:由非挥发性有机溶剂中的纤维素酯组成的涂料通过限定在内管和外管之间的环形狭缝挤出 具有双管结构的纺丝喷嘴,而芯液被迫通过所述喷嘴的内管; 中空纤维挤出物在凝固浴中凝结; 凝固的中空纤维挤出物的原始长度为1.05〜2.00倍; 然后,用含有至少0.5重量%的水溶性金属盐的苛性碱水溶液处理在中空体中仍含有核心液体的拉伸中空纤维,从而将纤维素酯水解成纤维素。