Porous membrane

Patent metadata

Field	Value
Publication number	US-2018290110-A1
Application number	US-201615574305-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	May 27, 2015
Publication date	Oct 11, 2018
Grant date	—

Abstract

A porous membrane comprising a membrane-forming polymer (A) and a polymer (B) containing a methyl methacrylate unit and a hydroxyl group-containing (meth)acrylate (b1) unit. A flux of pure water to permeate the porous membrane is preferably 10 (m3/m2/MPa/h) or more and less than 200 (m3/m2/MPa/h). The contact angle of the bulk of the membrane-forming polymer (A) is preferably 60° or more. The membrane-forming polymer (A) is preferably a fluorine-containing polymer. The polymer (B) is preferably a random copolymer.

First claim

1 . A porous membrane comprising:
a membrane-forming polymer (A); and a polymer (B) comprising a methyl methacrylate unit and a hydroxyl group-containing (meth)acrylate (b1) unit.

2 . The porous membrane according to claim 1 , wherein a flux of pure water to permeate the porous membrane is 10 (m 3 /m 2 /MPa/h) or more and less than 200 (m 3 /m 2 /MPa/h).

3 . The porous membrane according to claim 1 , wherein a contact angle of the bulk of the membrane-forming polymer (A) is 60° or more.

4 . The porous membrane according to claim 1 , wherein the membrane-forming polymer (A) is a fluorine-containing polymer.

5 . The porous membrane according to claim 1 , wherein the polymer (B) is a random copolymer.

6 . The porous membrane according to claim 1 , wherein the hydroxyl group-containing (meth)acrylate (b1) unit comprises at least one monomer unit selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, polyethylene glycol (meth)acrylate, and polypropylene glycol (meth)acrylate.

7 . The porous membrane according to claim 1 , wherein a content of the hydroxyl group-containing (meth)acrylate (b1) unit in the polymer (B) is from 20 to 60% by mass.

8 . The porous membrane according to claim 1 , wherein the polymer (B) comprises another monomer (b2) unit.

9 . The porous membrane according to claim 8 , wherein the other monomer (b2) unit is a (meth)acrylate unit comprising nitrogen.

10 . The porous membrane according to claim 9 , wherein the (meth)acrylate unit comprising nitrogen is either a unit of dimethylaminoethyl methacrylate or a quaternary salt of dimethylaminoethyl methacrylate.

11 . The porous membrane according to claim 8 , wherein the methyl methacrylate unit, the hydroxyl group-containing (meth)acrylate (b1) unit, and the other monomer (b2) unit in the polymer (B) are all methacrylate units.

12 . The porous membrane according to claim 8 , wherein the methyl methacrylate unit is from 20 to 60% by mass, the hydroxyl group-containing (meth)acrylate (b1) unit is from 20 to 60% by mass, and the other monomer (b2) unit is from 1 to 60% by mass in the polymer (B).

13 . The porous membrane according to claim 8 , wherein a molecular weight of the other monomer constituting the polymer (B) is 300 or less.

14 . The porous membrane according to claim 1 , wherein a proportion of the polymer (B) with respect to a sum of the membrane-forming polymer (A) and the polymer (B) in the porous membrane from is 0.1 to 40% by mass.

15 . The porous membrane according to claim 1 , wherein a contact angle of an outer surface of the porous membrane to pure water is from 1 to 70°.

16 . The porous membrane according to claim 1 , wherein an average pore diameter of a surface of the porous membrane is 300 nm or less.

17 . The porous membrane according to claim 16 , wherein an average pore diameter of a surface of the porous membrane is 150 nm or less.

18 . The porous membrane according to claim 1 , wherein a shape of the porous membrane is a hollow fiber shape.

19 . A water treatment apparatus comprising the porous membrane according to claim 18 .

20 . A method of manufacturing a porous membrane, the method comprising:
coagulating a membrane-forming stock solution comprising a membrane-forming polymer (A), a polymer (B) comprising a methyl methacrylate unit and a hydroxyl group-containing (meth)acrylate (b1) unit, and a solvent.

Assignees

• Mitsubishi Chem Corp

Inventors

• Hikita Shingo
• Teramachi Masashi
• SHINODA Ami
• SUENAGA Naotaka
• Fukuta Hiroki

Classifications

• C08F220/281

  and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate · CPC title

• C08F220/286

  and containing polyethylene oxide in the alcohol moiety, e.g. methoxy polyethylene glycol (meth)acrylate · CPC title

• B01D71/34

  Polyvinylidene fluoride · CPC title

• B01D2323/30

  Cross-linking · CPC title

• C08L27/12

  containing fluorine atoms · CPC title