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    POROUS VINYLIDENE FLUORIDE RESIN MEMBRANE AND PROCESS FOR PRODUCING SAME
    21.
    发明申请
    POROUS VINYLIDENE FLUORIDE RESIN MEMBRANE AND PROCESS FOR PRODUCING SAME 审中-公开

    公开(公告)号：US20120160764A1

    公开(公告)日：2012-06-28

    申请号：US13393628

    申请日：2010-09-06

    申请人： Yasuhiro Tada ,  Takeo Takahashi

    发明人： Yasuhiro Tada ,  Takeo Takahashi

    IPC分类号： B01D71/34 ,  C02F1/44 ,  C08J9/26 ,  B01D69/08

    CPC分类号： B01D71/34 ,  B01D67/002 ,  B01D67/0027 ,  B01D67/003 ,  B01D69/02 ,  B01D69/08 ,  B01D2323/20 ,  B01D2325/022 ,  B01D2325/24 ,  B29C48/08 ,  B29C48/914 ,  B29C48/918 ,  B29C48/919 ,  C02F1/44 ,  C02F3/1273 ,  D01D5/08 ,  D01D5/24 ,  D01F1/02 ,  D01F1/10 ,  D01F6/12 ,  Y02W10/15

    摘要： A porous membrane of vinylidene fluoride resin, comprising a substantially single layer membrane of vinylidene fluoride resin having two major surfaces sandwiching a certain thickness, including a dense layer that has a small pore size and governs a filtration performance on one major surface side thereof, having an asymmetrical gradient network structure wherein pore sizes continuously increase from the one major surface side to the other opposite major surface side, and satisfying conditions: (a) the dense layer includes a 5 μm-thick portion contiguous to the one major surface showing a porosity A1 of at least 60%, (b) the one major surface shows a pore size P1 of at most 0.30 μm, and (c) the porous membrane shows a ratio Q/P14 of at least 5×104 (m/day·μm4), wherein the ratio Q/P14 denotes a ratio between Q (m/day) which is a value normalized to a whole layer porosity A2=80% of a water permeation rate measured at a test length L=200 mm under the conditions of a pressure difference of 100 kPa and a water temperature of 25° C., and a fourth power P14 of the pore size P1 on the one major surface. The porous membrane is produced through a process including: extruding a melt-kneaded mixture of a vinylidene fluoride resin and a plasticizer through a die into a form of a film, followed by cooling, to form a solidified film; and extracting the plasticizer to recover a porous membrane; wherein the plasticizer is mutually soluble with the vinylidene fluoride resin at a temperature forming the melt-kneaded mixture and further satisfies properties: (i) giving the melt-kneaded mixture with the vinylidene fluoride resin with a crystallization temperature Tc′ (° C.) which is lower by at least 6° C. than a crystallization temperature Tc of the vinylidene fluoride alone, (ii) giving the cooled and solidified product of the melt-kneaded mixture a crystal melting enthalpy ΔH′ (J/g) of at least 53 J/g per weight of the vinylidene fluoride resin as measured by a differential scanning calorimeter (DSC), and (iii) the plasticizer alone showing a viscosity of 200 mPa-s-1000 Pa-s at a temperature of 25° C. as measured according to JIS K7117-2 (using a cone-plate-type rotational viscometer).

    VINYLIDENE FLUORIDE RESIN POROUS MEMBRANE, MANUFACTURING METHOD THEREFOR, AND METHOD FOR MANUFACTURING FILTRATE WATER
    22.
    发明申请
    VINYLIDENE FLUORIDE RESIN POROUS MEMBRANE, MANUFACTURING METHOD THEREFOR, AND METHOD FOR MANUFACTURING FILTRATE WATER 有权
    乙烯基氟化物树脂多孔膜及其制造方法，以及制造过滤水的方法

    公开(公告)号：US20120103895A1

    公开(公告)日：2012-05-03

    申请号：US13382199

    申请日：2010-07-08

    申请人： Yasuhiro Tada ,  Takeo Takahashi

    发明人： Yasuhiro Tada ,  Takeo Takahashi

    IPC分类号： B01D71/34 ,  B29C67/20

    CPC分类号： D01F6/48 ,  B01D67/002 ,  B01D69/08 ,  B01D69/087 ,  B01D71/34 ,  B01D2325/02 ,  C02F1/444 ,  C02F3/1268 ,  D01D5/24 ,  D01F1/10 ,  Y02W10/15

    摘要： A porous membrane of vinylidene fluoride resin, including a 10 μm-thick portion contiguous to one surface thereof which comprises network resin fibers having an average diameter of at most 100 nm and shows a porosity A1 of at least 60% as measured by a focused ion beam-scanning electron microscope, and showing a surface pore size of at most 0.3 μm on said one surface thereof. The porous membrane has a treated water side surface layer showing a small surface pore size suitable for water filtration treatment and formed of extremely thin network resin fibers giving an extremely high porosity, thus showing an excellent minute particle-blocking performance and also extremely good anti-soiling resistance and regeneratability. The porous membrane is produced by a process including: melt-extrusion of a composition obtained by adding to vinylidene fluoride resin of a large molecular weight a relatively large amount of a polyester plasticizer which is mutually soluble with the resin and provides the resultant mixture with a crystallization temperature that is substantially identical to that of the vinylidene fluoride resin alone to form film, followed by cooling from one side of the film to solidify the film, extracting the plasticizer and stretching the membrane after the extraction while partially wetting a surface portion thereof.

    摘要翻译： 偏二氟乙烯树脂的多孔膜包括与其一个表面相邻的10μm厚的部分，其包含平均直径为至多100nm的网状树脂纤维，并且通过聚焦离子测量显示出至少60％的孔隙率A1 光束扫描电子显微镜，并且在其一个表面上显示出至多0.3μm的表面孔径。 多孔膜具有处理水侧表面层，其表现出适于水过滤处理的小表面孔径，并且由极细的网状树脂纤维形成，具有极高的孔隙率，因此显示出极好的微粒阻挡性能， 耐污染性和再生性。 多孔膜是通过以下方法制造的：将通过向大分子量的偏二氟乙烯树脂中加入相对大量与树脂相溶的聚酯增塑剂而获得的组合物进行熔融挤出，并将所得混合物与 结晶温度与单独的偏二氟乙烯树脂基本上相同以形成膜，然后从膜的一侧冷却以固化膜，萃取增塑剂并在提取之后拉伸膜，同时部分润湿其表面部分。