Separation membrane and method for producing the same
AssigneeToray Industries, Inc.
InventorsKenji Komori, Toshiyuki Ishizaki, Kenta Iwai, Xunyao Fu, Shinichi Minegishi, Nao Minaki
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Abstract
A separation membrane including a separation-functional layer is provided, wherein the separation-functional layer contains a polyvinylidene fluoride-type resin having a melt viscosity of 3,300 Pa·s or more, and also the separation-functional layer has a three-dimensional network structure. A separation membrane is provided having high virus removal performance, high pure water permeability, and high physical durability and high chemical strength, which can also be used in the field of water treatment.
Claims14
A separation membrane comprising a separation-functional layer, wherein the separation-functional layer contains a polyvinylidene fluoride resin having a melt viscosity of 3,300 Pa·s or more and 7,000 Pa·s or less, and the separation-functional layer has a three-dimensional network structure, wherein when the separation-functional layer is divided into thin layers each having a thickness of 0.2 μm along the thickness direction, 50 to 400 thin layers have a maximum pore diameter of 0.03 to 0.6 μm, 1 to 100 thin layers have a maximum pore diameter of 0.1 μm or more and less than 0.2 μm, 1 to 30 thin layers have a maximum pore diameter of 0.03 μm or more and less than 0.1 μm, and 0 to 2 thin layers have a maximum pore diameter of less than 0.03 μm.
Dependencies are inferred from the claim text.