Fouling inhibitor, filtration membrane and method for producing same

Patent metadata

Field	Value
Publication number	US-10376848-B2
Application number	US-201414763880-A
Country	US
Kind code	B2
Filing date	Jan 16, 2014
Priority date	Jan 28, 2013
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

Provided are: a fouling inhibitor that is capable of effectively inhibiting fouling of porous filtration membranes use as water purification membranes or the like, that has resistance to chemicals, such as alkali used when the membrane is fouled, and that is capable of maintaining such effects sufficiently even after chemical wash; a filtration membrane provided with the inhibitor; and a method for producing the same. The inhibitor contains: (A) a copolymer having a weight average molecular weight of 10000 to 300000 and contains a MPC unit (a1) and a BMA unit (a2), wherein the ratio of (a1) to (a2) ((a1)/(a2)) by mole is 10/90 to 70/30; and (B) PVA having a saponification degree of 72 to 93 mol % and a polymerization degree of 300 to 1000, wherein the ratio of component (A) to component (B) ((A)/(B)) by mass is 25/75 to 75/25.

First claim

What is claimed is:

1. A fouling inhibitor for a porous filtration membrane, comprising:
(A) a copolymer having a weight average molecular weight of 10,000 to 300,000 and comprising
(a1) a 2-methacryloyloxyethyl phosphorylcholine unit and
(a2) a n-butylmethacrylate unit, wherein a ratio of (a1) to (a2) ((a1)/(a2)) by mole is 10/90 to 70/30, and

(B) an unmodified polyvinyl alcohol having a saponification degree of 72 to 93 mol % and a polymerization degree of 300 to 1,000,
wherein a ratio of component (A) to component (B) ((A)/(B)) by mass is 25/75 to 75/25.

2. The fouling inhibitor according to claim 1 further comprising a solvent for components (A) and (B).

3. A filtration membrane provided with a fouling inhibitor of claim 1 .

4. A method of producing a filtration membrane comprising making a fouling inhibitor of claim 1 adhere to a porous filtration membrane.

5. The fouling inhibitor according to claim 1 , wherein the unmodified polyvinyl alcohol consists essentially of alcohol units and acetate units derived from vinyl acetate.

Assignees

• Nof Corp

Inventors

• NAKASHIMA Mitsuyasu
• Nomura Hideyuki
• Yamada Satoshi

Classifications

• B01D67/0088

  Physical treatment with compounds, e.g. swelling, coating or impregnation · CPC title

• C02F1/44

  by dialysis, osmosis or reverse osmosis {(general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268)} · CPC title

• B01D2323/12

  Specific ratios of components used · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• B01D71/34 Primary

  Polyvinylidene fluoride · CPC title