Porous membrane and preparation method thereof
AssigneeKolon Industries, Inc.
InventorsJoon-Khee Yoon, Moo-Seok Lee
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Abstract
Disclosed is a porous membrane with high tensile strength, good elongation at break, and good water permeability, and a method for manufacturing the same. The porous membrane comprises a bead structure including plural spherical crystallites, wherein macro voids isolated from one another with the plural spherical crystallites are formed in an outer surface side of the porous membrane.
Claims13
A porous membrane comprising a bead structure including plural spherical crystallites, wherein macro voids isolated from one another with the plural spherical crystallites are formed in an outer surface side of the porous membrane, wherein the porous membrane comprises polyvinylidene fluoride.
A method for manufacturing a porous membrane comprising:
- preparing a spinning solution by dissolving polymer resin in a mixture solvent including both poor solvent and good solvent at 100˜120° C., wherein the polymer resin is polyvinylidene fluoride, the poor-solvent is gamma-butyrolactone, and the good solvent is dimethylacetamide;
- extruding the spinning solution through a spinneret;
- and
- bringing the extruded spinning solution into contact with a coagulation solution including a non-solvent thereby forming a porous structure.
Dependencies are inferred from the claim text.