JP2007289944A5

JP2007289944A5 -

Info

Publication number: JP2007289944A5
Application number: JP2007087173A
Authority: JP
Filing date: 2007-03-29
Publication date: 2010-02-04
Anticipated expiration: 2027-03-29

Description

膜素材としては、ポリフェニルスルホン樹脂および親水性ポリビニルピロリドンの水溶性有機溶媒溶液よりなる紡糸原液を用い、Ｎ−メチル−２−ピロリドン水溶液を芯液として乾湿式紡糸し、多孔質ポリフェニルスルホン樹脂中空糸膜を得る方法は、既に提案されている。しかし、ここで得られた中空糸膜は油水分離用限外ロ過膜等に好適に使用されると述べられており、水蒸気透過を目的とするものではなかった。（特許文献１）
また、ポリフェニルスルホン樹脂および親水性ポリビニルピロリドンの水溶性有機溶媒溶液よりなる紡糸溶液中にさらに水を加え、水を芯液として乾湿式紡糸し、多孔質ポリフェニルスルホン樹脂中空糸膜を得る方法も提案されているが（特許文献２〜３）、ここでもその目的は純水透過係数の改善を図ることにあるとされており、水蒸気透過を目的とするものではなかった。
また、多孔質ポリフェニルスルホン樹脂中空糸膜を燃料電池用加湿膜に使用し得ることが特許文献４に記載されている。
特開２００１−２１９０４３号公報特開２００１−４６８４７号公報特開２００１−４６８４８号公報特開２００４−２９０７５１号公報 As the membrane material, a porous stock of polyphenylsulfone resin is prepared by using a spinning stock solution composed of a polyphenylsulfone resin and a water-soluble organic solvent solution of hydrophilic polyvinyl pyrrolidone, and using a N-methyl-2-pyrrolidone aqueous solution as a core solution for dry and wet spinning. A method for obtaining a hollow fiber membrane has already been proposed. However, it is stated that the hollow fiber membrane obtained here is suitably used for an ultrafiltration membrane for oil-water separation and the like, and was not intended for water vapor permeation. (Patent Document 1)
Further, a method for obtaining a porous polyphenylsulfone resin hollow fiber membrane by further adding water into a spinning solution comprising a water-soluble organic solvent solution of polyphenylsulfone resin and hydrophilic polyvinylpyrrolidone, and dry-wet spinning using water as a core solution (Patent Documents 2 to 3 ) are also proposed, but the purpose here is to improve the pure water permeation coefficient, and is not intended to permeate water vapor.
Patent Document 4 describes that a porous polyphenylsulfone resin hollow fiber membrane can be used as a humidifying membrane for a fuel cell.
JP 2001-219043 A JP 2001-46847 A Japanese Patent Laid-Open No. 2001-46848 Japanese Patent Application Laid-Open No. 2004-290751

Claims

In the humidifying membrane, the sieve coefficient for dextran having a weight average molecular weight of 30,000 is 0.1 or less, the sieve coefficient for dextran having a weight average molecular weight of 1200 is 0.3 or more, and the water permeability is 1.1 × 10. A humidifying membrane characterized by being ^-11 m ³ / m ² / s / Pa or more and 4.3 × 10 ^-10 m ³ / m ² / s / Pa or less.

The humidifying membrane according to claim 1, wherein the humidifying membrane has a support layer having a void length of 0.3 µm or more and a dense layer having a void length of 0.1 µm or less and a thickness of 2.0 µm or less. .

The humidifying membrane according to claim 1 or 2, wherein the humidifying membrane material contains polysulfone.

The humidifying film according to claim 1, wherein the humidifying film contains a hydrophilic polymer.

The humidifying membrane according to claim 4, wherein the hydrophilic polymer is polyvinylpyrrolidone.

The humidifying membrane according to any one of claims 1 to 5, wherein the humidifying membrane is a hollow fiber membrane.

The humidifying membrane according to claim 6, wherein the hollow fiber membrane has an inner diameter of 200 µm to 800 µm and a film thickness of 40 µm to 200 µm.

In the method for producing a humidifying film, the method includes a step of forming a film by discharging a film-forming stock solution from a die, a step of washing with hot water of 40 ° C. or higher and 90 ° C. or lower, and a step of winding after cleaning. 6. The method for producing a humidifying film according to claim 4, further comprising a step of drying at 40 ° C. or higher and 150 ° C. or lower for 30 minutes or more using a heat dryer.

The humidification membrane module which incorporated the humidification membrane in any one of Claims 1-7.