Polyamide water-treatment separation membrane having superior oxidation resistance and chlorine resistance properties, and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9833751-B2
Application number	US-201414387470-A
Country	US
Kind code	B2
Filing date	Jun 5, 2014
Priority date	Jun 7, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The present disclosure relates to a water-treatment separation membrane including: a porous support and a polyamide layer formed on the porous support, wherein the polyamide layer contains an antioxidant having a solubility parameter value of 9 (J/cm 3 ) 1/2 to 22 (J/cm 3 ) 1/2 , and a method of manufacturing the same.

First claim

What is claimed:

1. A water-treatment separation membrane comprising:
a porous support; and
a polyamide layer formed on the porous support,
wherein the polyamide layer contains an antioxidant having a solubility parameter value of 9 (J/cm 3 ) 1/2 to 22 (J/cm 3 ) 1/2 , wherein:
the antioxidant is a phenol antioxidant of Chemical Formula 2:

wherein R 2 is:

wherein a, b, c, d, and e each independently is an integer of 1 to 10, X 1 is —N—, and R 4 , R 4 ′ and R 4 ″ each independently has a structure of Chemical Formula 3:

wherein X 2 is —N—.

2. The water-treatment separation membrane of claim 1 , wherein the polyamide active layer is formed by bringing an aqueous solution containing an amine compound into contact with an organic solution containing an acyl halide compound to allow for an interfacial polymerization, and the antioxidant is contained in an amount of 0.02 to 5 parts by weight based on 100 parts by weight of a solid content of the acyl halide compound contained in the organic solution.

3. The water-treatment separation membrane of claim 1 , wherein a salt rejection rate of the water-treatment separation membrane after being immersed in de-ionized water for 14 days is 99.10% or more.

4. The water-treatment separation membrane of claim 1 , wherein a salt rejection rate of the water-treatment separation membrane after being stored under light-tight conditions for 16 days is 98.50% or more.

5. The water-treatment separation membrane of claim 1 , wherein a salt rejection rate of the water-treatment separation membrane after allowing a mixed aqueous solution containing an aqueous sodium chloride solution at a concentration of 32,000 ppm and sodium hypochlorite at a concentration of 2,000 ppm to pass through the water-treatment separation membrane for 12 hours is 98.50% or more.

6. The water-treatment separation membrane of claim 1 , wherein variations in a salt rejection rate of the water-treatment separation membrane after allowing a mixed aqueous solution containing an aqueous sodium chloride solution at a concentration of 32,000 ppm and sodium hypochlorite at a concentration of 2,000 ppm to pass through the water-treatment separation membrane for 12 hours are 0.5% or less, as compared to an initial salt rejection rate of the water-treatment separation membrane.

7. The water-treatment separation membrane of claim 1 , wherein variations in a permeate flux of the water-treatment separation membrane after allowing a mixed aqueous solution containing an aqueous sodium chloride solution at a concentration of 32,000 ppm and sodium hypochlorite at a concentration of 2,000 ppm to pass through the water-treatment separation membrane for 12 hours are 10% or less, as compared to an initial permeate flux of the water-treatment separation membrane.

8. A water-treatment module comprising the water-treatment separation membrane of claim 1 .

9. A water-treatment device comprising the water-treatment module of claim 8 .

10. A method of manufacturing a water-treatment separation membrane, the method comprising:
forming an aqueous solution layer containing an amine compound on a porous support; and
forming a polyamide layer by bringing an organic solution containing an acyl halide compound and an antioxidant having a solubility parameter value of 9 (J/cm 3 ) 1/2 to 22 (J/cm 3 ) 1/2 into contact with the aqueous solution layer, wherein:
the antioxidant is present in an amount of 0.02 to 5 parts by weight based on 100 parts by weight of a solid content of the acyl halide compound contained in the organic solution; and
the antioxidant is a phenol antioxidant of Chemical Formula 2:

wherein R 2 is:

wherein a, b, c, d, and e each independently is an integer of 1 to 10, X 1 is —N—, and R 4 , R 4 ′ and R 4 ″ each independently has a structure of Chemical Formula 3:

wherein X 2 is —N—.

Assignees

• Lg Chemical Ltd

Inventors

• Ko Young-Hoon
• Kim Jae-Hong
• Song Keun-Won
• Shin Chong-Kyu

Classifications

• B01D69/02

  characterised by their properties · CPC title

• B01D2325/30

  Chemical resistance · CPC title

• B01D71/56 Primary

  Polyamides, e.g. polyester-amides · CPC title

• B01D2325/28

  Degradation or stability over time · CPC title

• B01D67/0006

  by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125) · CPC title