METHOD FOR MANUFACTURING COMPOSITE SEMIPERMEABLE MEMBRANE

    公开(公告)号:JP2003200027A

    公开(公告)日:2003-07-15

    申请号:JP2002001149

    申请日:2002-01-08

    Abstract: PROBLEM TO BE SOLVED: To provide a composite semipermeable membrane which selectively separates and removes pollutants and traces of toxic substances contained in raw water and enables a high water recovery operation. SOLUTION: The subject method for manufacturing the composite semipermeable membrane is characterized by carrying out an interfacial polycondensation reaction between a mixed amine component composed of aliphatic and aromatic polyfunctional amines and a mixed acid halide component composed of a polyfunctional acid halide and a polyfunctional acid anhydride halide on a porous supporting membrane and forming a crosslinked polyamide thin film and subsequently bringing the thin film into contact with an aqueous alkali solution of pH 11 or higher. COPYRIGHT: (C)2003,JPO

    COMPOSITE SEMIPERMEABLE MEMBRANE AND ITS MANUFACTURING METHOD

    公开(公告)号:JP2001327840A

    公开(公告)日:2001-11-27

    申请号:JP2000154486

    申请日:2000-05-25

    Abstract: PROBLEM TO BE SOLVED: To provide a composite semipermeable membrane having high excluding property of solute and high water permeability even at an operation under low pressure, and its manufacturing method. SOLUTION: After a multifunctional aliphatic amine compound having at least two amino groups in one molecule is polycondensed with a multifunctional acid halide compound having at least two acid halide groups in one molecule to form a separation functional layer containing a polyamide on a porous support membrane, a water soluble organic polymer containing a hydrophilic group is applied on the separation functional layer, and subsequently this water soluble organic polymer is crosslinked to form a water insoluble protective layer containing a hydrophilic group.

    SEMIPERMEABLE MEMBRANE AND ITS PRODUCTION

    公开(公告)号:JP2000296317A

    公开(公告)日:2000-10-24

    申请号:JP10498699

    申请日:1999-04-13

    Abstract: PROBLEM TO BE SOLVED: To improve durability and also to improve separability and permeability by incorporating a polymer having sugar skeleton in an ultrathin membrane with respect to a composite semipermeable membrane consisting of the ultrathin membrane and a micro-porous supporting membrane. SOLUTION: The composite semipermeable membrane is constituted by applying a ultrathin membrane layer having separability onto the micro-porous supporting membrane. In this case the ultrathin membrane layer is formed from a polymer having sugar skeleton. The crosslinked polyester obtained by interface polycondensation of a sugar compd. and polyfunctional acid halide is used as the polymer. On the other hand, the aq. soln. of the sugar compd. and the org. solvent soln. of the acid halide are brought into contact with the micro-porous supporting membrane to allow interfacial polycondensation for its production. Monosaccharide and oligosaccharide are used preferably as the sugar compd.. Moreover, the compd. containing at least one kind selected from the group of the acid halide compd. having at least two acid halide groups is used as the polyfunctional acid halide and arom. acid halide is preferably used.

    ELECTRODE AND NONAQUEOUS SECONDARY BATTERY USING IT

    公开(公告)号:JPH09293511A

    公开(公告)日:1997-11-11

    申请号:JP16764996

    申请日:1996-06-27

    Abstract: PROBLEM TO BE SOLVED: To provide an electrode with high discharging capacity and high repeating charging/discharging characteristics by using carbon fibers in which the ratio of oxygen atoms to carbon atoms in the vicinity of the surface is specified and the size of a crystallite is specified as an active material. SOLUTION: As the active material of the electrode of a secondary battery, carbon fiber powder capable of pouring/releasing lithium ions is used. The carbon fibers in which the ratio of oxygen atoms to carbon atoms in the vicinity of the surface is 10% or less, preferably 6% or less, and preferably the ratio of nitrogen atoms to carbon atoms is 3% or less, and the size of crystallite (LC) is 1.0-5.0nm, preferably 1.0-2.5nm are used. The carbon fibers are obtained by forming amorphous carbon fibers in short fibers if necessary, then heat- treating the amorphous carbon fibers under the atmosphere of reduced pressure and/or the inert gas atmosphere at 700-1600 deg.C, preferably at 1000-1500 deg.C for one minutes to 50 hours, preferably 30 minutes to 8 hours.

    METHOD FOR MANUFACTURING SEMIPERMEABLE MEMBRANE

    公开(公告)号:JP2003117360A

    公开(公告)日:2003-04-22

    申请号:JP2001319050

    申请日:2001-10-17

    Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a semipermeable membrane having high desalting property and high water permeability and effective to desalt brine or sea water. SOLUTION: The method for manufacturing the semipermeable membrane features that a semipermeable membrane is brought into contact with an aqueous solution containing an organic acid.

    COMPOSITE SEMIPERMEABLE MEMBRANE FOR SEWAGE DISPOSAL AND ITS MANUFACTURING METHOD

    公开(公告)号:JP2002224546A

    公开(公告)日:2002-08-13

    申请号:JP2001344433

    申请日:2001-11-09

    Abstract: PROBLEM TO BE SOLVED: To provide a composite semipermeable membrane for sewage disposal wherein a permeation flow rate is stable with the lapse of time and high, and provide an apparatus and a method for sewage disposal using the same. SOLUTION: Sewage is disposed by using the composite semipermeable membrane wherein a covalent bond is formed between a reactive group and an acid halide group remaining on a surface of a separation functional layer by coating an aqueous solution of a compound having at least one reactive group to be reacted with the acid halide group on a surface of a polyamide separation function layer just after providing the polyamide separation function layer on a fine porous support membrane by polycondensating a multifunctional amine compound with a multifunctional acid halide.

    SEMIPERMEABLE MEMBRANE AND ITS PRODUCTION METHOD

    公开(公告)号:JP2001276587A

    公开(公告)日:2001-10-09

    申请号:JP2000093983

    申请日:2000-03-30

    Abstract: PROBLEM TO BE SOLVED: To provide a semipermeable membrane having both high desalting capability and high permeability. SOLUTION: A solution containing a naphthalene derivative represented by the formula (wherein the substituents on the naphthalene ring occupy any two of 1- to 8-positions; and R1 to R3 are each H or a 1-5C alkyl) is applied to a porous substrate, and then the derivative is polymerized to form a separation-functional layer on the substrate.

    BATTERY ELECTRODE AND BATTERY USING IT

    公开(公告)号:JPH1186844A

    公开(公告)日:1999-03-30

    申请号:JP26156797

    申请日:1997-09-26

    Abstract: PROBLEM TO BE SOLVED: To provide an electrode superior in handling property and having high capacity, high output characteristic, good cycle characteristic, and high safety by integrally forming an electrically insulating fine porous film, having specific strength and elastic modulus on an electrode substrate by the wet coagulation method. SOLUTION: A fine porous film made mainly of a thermoplastic resin is integrally provided on an electrode substrate provided with an active material made of a lithium composite oxide or a carbon material on a conductive material via a binder. A fluorine-containing polymer containing α-polyvinylidene fluoride 40 wt.% or above and/or a sulfur-containing polymer is preferably used for this thermoplastic resin. The fine porous film is made of a wet coagulation paint film with the thickness of about 200 μm or below, having a strength of 0.1-10 MPa, preferably 0.5-2 MPa, an elastic modulus of 10-200 MPa, preferably 10-100 MPa, the median diameter of the fine bore diameter of 40-1500 mm, and the porosity of 40-90%, preferably 65-90%.

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