Porous polymer flat-sheet membrane

摘要

The present invention provides a porous polymer flat-sheet membrane for MBR wherein surface of the porous polymer membrane is kept hydrophilic for a long period and high water permeability and anti-fouling properties are kept. A porous polymer flat-sheet membrane for MBR comprising a hydrophobic porous polymer membrane forming a network structure and a sheet substrate supporting it, characterized in that at least surface of the porous polymer membrane is coated and fixed with an insolubilized hydroxypropyl cellulose, that a ratio of the hydroxypropyl cellulose to the porous polymer membrane is 0.4 to 1.0% by weight and that, when NMR spectrum of the hydroxypropyl cellulose coated on and fixed to the membrane is measured using a nuclear magnetic resonance apparatus (proton NMR), an intensity ratio (B/A) of a spectral peak (B) appearing at 4.12 ppm to a spectral peak (A) appearing at 3.75 ppm is 12 to 30%.

主权项

1. A porous polymer flat-sheet membrane for MBR comprising;
a hydrophobic porous polymer membrane forming a network structure, and a sheet substrate supporting it, wherein at least a surface of the hydrophobic porous polymer membrane are coated and fixed with an insolubilized hydroxypropyl cellulose, such that a content ratio of the hydroxypropyl cellulose in the porous polymer flat-sheet membrane is 0.4 to 1.0% by weight and that, when NMR spectrum of the hydroxypropyl cellulose coated on and fixed to the hydrophobic porous polymer membrane is measured using a nuclear magnetic resonance apparatus (proton NMR), an intensity ratio (B/A) of a spectral peak (B) appearing at 4.12 ppm to a spectral peak (A) appearing at 3.75 ppm is 12 to 30%.