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    • 81. 发明申请
    • METHOD FOR PREPARING DOUBLE LAYERED POROUS HOLLOW MEMBRANE AND DEVICE AND PRODUCT THEREOF
    • 双层多孔中空膜制备方法及其制备方法
    • US20150136691A1
    • 2015-05-21
    • US14604678
    • 2015-01-24
    • MEMSTAR (Guangzhou) Co. Ltd
    • Xinhao YANGHailin GE
    • B01D69/08B01D69/12
    • B01D69/08B01D69/02B01D69/088B01D2325/02B01D2325/04B01D2325/24
    • A method for preparing a double layered porous hollow fiber membrane and the device and product thereof. The method comprises preparing uncured porous hollow fiber with larger pore diameters as the inner robust supporter of the membrane from thermoplastic polymeric resins by thermal induced phase separation (TIPS) method and then binding an ultra thin coating layer with hydrophilic microfiltration or ultrafiltration function and fine pore diameters prepared on the outer surface of the robust hollow fibers from a solution of the thermoplastic polymeric resins by a coating process using non-solvent induced phase separation (NIPS) method. The double layered porous hollow fiber membranes have such excellent mechanical strength and high water permeation as the membranes prepared by thermal induced phase separation (TIPS) method, such high accurate filtration effect, high hydrophilic effect and high fouling resistance as the membranes prepared by non-solvent induced phase separation (NIPS) method, and high binding force of the membranes between the layers by the above method.
    • 一种双层多孔中空纤维膜的制备方法及其装置及其制造方法。 该方法包括通过热诱导相分离(TIPS)方法从热塑性聚合物树脂制备具有较大孔径的未固化多孔中空纤维作为膜的内部坚固支撑物,然后将超薄涂层与亲水微滤或超滤功能和细孔结合 通过使用非溶剂诱导相分离(NIPS)方法的涂覆方法,从热塑性聚合物树脂的溶液在稳固的中空纤维的外表面上制备的直径。 双层多孔中空纤维膜具有通过热诱导相分离(TIPS)方法制备的膜具有优异的机械强度和高的透水性,如由非线性制备的膜制备的高精度过滤效果,高亲水效果和高耐污性, 溶剂诱导相分离(NIPS)方法,并通过上述方法在层之间的膜的高结合力。
    • 82. 发明申请
    • Preparation method of homogeneous-reinforced PVDF hollow fiber membrane
    • 均质增强PVDF中空纤维膜的制备方法
    • US20150096934A1
    • 2015-04-09
    • US14381213
    • 2013-01-24
    • TIANJIN POLYTECHNIC UNIVERSITY
    • Changfa XiaoXuliang ZhangXiaoyu HuShulin AnQinglin HuangGuolan Huan
    • B01D71/34B01D63/02B01D67/00B01D69/08B01D69/12
    • B01D71/34B01D63/02B01D63/021B01D67/0013B01D67/0016B01D67/002B01D69/02B01D69/08B01D69/088B01D69/10B01D69/12B01D2323/00B01D2325/40
    • A preparation method of a homogeneous-reinforced PVDF hollow fiber membrane includes steps of: a) preparing a reinforced matrix membrane, wherein a PVDF hollow fiber membrane is utilized as the reinforced matrix membrane; b) preparing a PVDF casting solution, wherein mass fractions of the PVDF casting solution are: PVDF 6˜20 wt %; hydrophilic polymers or hydrophilic inorganic particles 0.6˜2 wt %; pore-forming agent 6˜10 wt %; and solvent 68˜87.4 wt %; mixing the above solutes in a water bath with a temperature of 70˜90° C., dissolving for 3˜4 h with stirring, then deaerating under vacuum for obtaining the uniform PVDF casting solution; and c) preparing the homogeneous-reinforced membrane; wherein the PVDF casting solution is uniformly coated on an outer surface of the reinforced matrix membrane through a spinning spinneret, then the reinforced matrix membrane is towed by a filament guide roller in such a manner that the hollow fiber forms a membrane, then the membrane passes through an air gap with a length of 5˜20 cm and is immersed in ultrafiltered water for coagulation, in such a manner that the homogeneous-reinforced membrane is obtained; wherein a traction speed is 5˜25 cm/(r·min).
    • 均质增强PVDF中空纤维膜的制备方法包括以下步骤:a)制备增强基质膜,其中使用PVDF中空纤维膜作为增强基质膜; b)制备PVDF浇注溶液,其中PVDF浇铸溶液的质量分数为:PVDF 6〜20wt%; 亲水性聚合物或亲水性无机颗粒0.6〜2重量% 成孔剂6〜10重量% 和溶剂68〜87.4wt%; 将上述溶质混合在温度为70〜90℃的水浴中,搅拌溶解3〜4h,然后真空脱气,得到均匀的PVDF浇铸溶液; 和c)制备均质增强膜; 其中通过纺丝喷丝头将PVDF铸塑溶液均匀地涂覆在增强基体膜的外表面上,然后用丝导引辊牵引加强基体膜,使得中空纤维形成膜,然后膜通过 通过长度为5〜20cm的气隙,浸渍在超滤水中进行凝固,得到均质增强膜; 牵引速度为5〜25cm /(r·min)。