Hollow fiber membrane and method for producing same

1 . A hollow fiber membrane comprising, sequentially from the center:

a first layer having a high-density sponge structure including pores with a size of 1 nm or less;

a second layer including a finger-shaped structure; and

a third layer having a low-density sponge structure including pores with a size of 10 to 1,000 μm.

2 . The hollow fiber membrane according to claim 1 ,

wherein the first layer has a thickness of 1 to 40 μm, the second layer has a thickness of 20 to 60 μm, and the third layer has a thickness of 20 to 50 μm.

3 . The hollow fiber membrane according to claim 1 ,

wherein the hollow fiber membrane has a water vapor transmission rate of 0.1 g/s/m 2 or greater as measured at a pressure of 1 bar and a temperature of 80° C.

4 . The hollow fiber membrane according to claim 1 ,

wherein the hollow fiber membrane has a nitrogen transmission rate at a pressure of 0.7 bar of 100 cc/min/cm 2 or less.

5 . The hollow fiber membrane according to claim 1 ,

wherein the hollow fiber membrane has an oxygen transmission rate at a pressure of 0.7 bar 100 cc/min/cm 2 or less.

6 . The hollow fiber membrane according to claim 1 ,

wherein the hollow fiber membrane has a tensile strength of 100 gf/fiber or greater.

7 . The hollow fiber membrane according to claim 1 ,

wherein the first layer to the third layer each independently include one or more selected from the group consisting of polyethersulfone, polyphenylsulfone, polysulfone, polyvinylidene fluoride, polyimide, polyetherimide, polyamide, polyacrylonitrile, and cellulose acetate.

8 . The hollow fiber membrane according to claim 1 ,

wherein the hollow fiber membrane has an inner diameter of 600 to 1,400 μm and an outer diameter of 1,000 to 2,000 μm.