Composite hollow fiber membrane and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2016325236-A1
Application number	US-201415108998-A
Country	US
Kind code	A1
Filing date	Dec 24, 2014
Priority date	Dec 31, 2013
Publication date	Nov 10, 2016
Grant date	—

Abstract

A composite hollow fiber membrane having improved water permeability and peel strength and a manufacturing method thereof are disclosed. The composite hollow fiber membrane includes a tubular polymer membrane having an outer surface and an inner surface, and a tubular braid disposed between the outer surface and the inner surface of the tubular polymer membrane, the tubular braid comprises a plurality of yarns, each of the yarns includes first multifilaments and second multifilaments, each of the first multifilaments includes a plurality of first monofilaments having fineness of 3 to 50 denier, and each of the second multifilaments includes a plurality of second monofilaments having fineness of 0.4 to 3 denier.

First claim

What is claimed is:

1 . A composite hollow fiber membrane comprising:
a tubular polymer membrane having an outer surface and an inner surface; and a tubular braid disposed between the outer surface and the inner surface of the tubular polymer membrane, wherein: the tubular braid comprises a plurality of yarns; each of the yarns includes first multifilaments and second multifilaments; each of the first multifilaments includes a plurality of first monofilaments having fineness of 3 to 50 denier; and each of the second multifilaments includes a plurality of second monofilaments having fineness of 0.4 to 3 denier.

2 . The composite hollow fiber membrane according to claim 1 , wherein:
each of the first multifilaments includes 30 to 150 first monofilaments; and each of the second multifilaments includes 20 to 100 first monofilaments.

3 . The composite hollow fiber membrane according to claim 1 , wherein:
the first multifilaments have fineness of 100 to 600 denier; and the second multifilaments have fineness of 10 to 200 denier.

4 . The composite hollow fiber membrane according to claim 1 , wherein each of the yarns includes 1 to 4 first multifilaments and 1 to 4 second multifilaments,
wherein the sum of the number of the first filaments and the number of the second multifilaments included in each yarn is three or more.

5 . The composite hollow fiber membrane according to claim 1 , wherein each of the yarns has fineness of 150 to 800 denier.

6 . The composite hollow fiber membrane according to claim 1 , wherein the tubular braid comprises 8 to 60 yarns.

7 . The composite hollow fiber membrane according to claim 1 , wherein:
the first and second monofilaments include at least one of polyolefin resin, polyethylene terephthalate resin and polyamide resin; and the polymer membrane includes at least one of polysulfone resin, polyether sulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride resin, polyacrylonitrile resin, polyimide resin, polyamideimide resin and polyesterimide resin.

8 . The composite hollow fiber membrane according to claim 1 , wherein:
the tubular braid has an external diameter of 1.2 to 2.0 mm; and a ratio of the thickness of the tubular braid to the external diameter of the tubular braid is 15 to 35%.

9 . The composite hollow fiber membrane according to claim 8 , wherein a distance between the inner surface of the polymer membrane and the tubular braid is 1 to 50% of the thickness of the tubular braid.

10 . A manufacturing method of a composite hollow fiber membrane, comprising:
manufacturing first multifilaments, each first multifilament including a plurality of first monofilaments having fineness of 3 to 50 denier; manufacturing second multifilaments, each second multifilament including a plurality of second monofilaments having fineness of 0.4 to 3 denier; manufacturing a plurality of yarns using the first multifilaments and the second multifilaments; braiding the yarns to manufacture a tubular braid; and supplying a polymer solution to the outer surface of the tubular braid.

11 . The manufacturing method according to claim 10 , wherein, in supply of the polymer solution of the outer surface of the tubular braid, the polymer solution passes through the tubular braid in the thickness direction of the tubular braid.

12 . The manufacturing method according to claim 10 , wherein supply of the polymer solution of the outer surface of the tubular braid includes:
causing the tubular braid to pass through an inner tube of a double tubular nozzle; and spinning the polymer solution through an outer tube of the double tubular nozzle.

13 . The manufacturing method according to claim 10 , wherein supply of the polymer solution of the outer surface of the tubular braid includes dipping the tubular braid in the polymer solution.

Assignees

• Kolon Inc

Inventors

• Lee Ah Reum
• Lee Jae Hun
• Shin Yong-Cheol
• Moon Heewan

Classifications

• B01D71/34

  Polyvinylidene fluoride · CPC title

• B01D71/68

  Polysulfones; Polyethersulfones · CPC title

• B01D69/08

  Hollow fibre membranes (manufacture of hollow fibres D01D5/24, D01F1/08) · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title

• B01D2325/40

  Fibre reinforced membranes · CPC title