INTERNAL PRESSURE TYPE HOLLOW FIBER NF MEMBRANE AND METHOD FOR MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an internal pressure type hollow fiber NF membrane suitable as an NF membrane for removing hard components in tap water or natural water.SOLUTION: An internal pressure type hollow fiber NF membrane is composed of a mixture including sulfonated polyether sulfone and polyether sulfone, wherein the content ratio in the total amount of the sulfonated polyether sulfone and the polyether sulfone are 20 to 50 mass% of the sulfonated polyether sulfone and 80 to 50 mass% of the polyether sulfone, and the sulfonation degree of the sulfonated polyether sulfone is 0.10 to 0.18.