Fouling prevention ability-imparting agent and water treatment membrane manufactured using same

Patent metadata

Field	Value
Publication number	US-11919986-B2
Application number	US-201917435289-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Mar 1, 2019
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

The present invention provides an antifouling ability-imparting agent that adheres well to a variety of water treatment membranes such as reverse osmosis membranes and imparts excellent antifouling ability to the water treatment membranes. The present invention relates to an antifouling ability-imparting agent containing a copolymer, the copolymer containing: a structural unit (I) represented by the following formula (1):

wherein R 1 is a hydrogen atom or a methyl group; R 2 is a direct bond, —CH 2 —, —CH 2 CH 2 —, or —CO—; R 3 s are the same as or different from each other and are each a C1-C20 alkylene group; X is —CH 2 CH(OH)CH 2 (OH) or —CH(—CH 2 OH) 2 ; and n is a number of moles of oxyalkylene groups added and is 0 to 100; and a structural unit (II) represented by the following formula (2):

wherein R 4 is a hydrogen atom or a methyl group; R 5 is a direct bond, —CH 2 —, —CH 2 CH 2 —, or —CO—; R 6 s are the same as or different from each other and are each a C1-C20 alkylene group; R 7 is a hydrogen atom or a C1-C20 alkyl group; and m is a number of moles of oxyalkylene groups added and is 1 to 100.

First claim

The invention claimed is:

1. An antifouling ability-imparting agent comprising a copolymer, the copolymer comprising:
a structural unit (I) represented by the following formula (1):

wherein R 1 is a hydrogen atom or a methyl group; R 2 is a direct bond, —CH 2 —, —CH 2 CH 2 —, or —CO—; R 3 s are the same as or different from each other and are each a C1-C20 alkylene group; X is —CH 2 CH(OH)CH 2 (OH) or —CH(—CH 2 OH) 2 ; and n is a number of moles of oxyalkylene groups added and is 0 to 100; and
a structural unit (II) represented by the following formula (2):

wherein R 4 is a hydrogen atom or a methyl group; R 5 is a direct bond, —CH 2 —, —CH 2 CH 2 —, or —CO—; R 6 s are the same as or different from each other and are each a C1-C20 alkylene group; R 7 is a hydrogen atom or a C1-C20 alkyl group; and m is a number of moles of oxyalkylene groups added and is 1 to 100.

2. The antifouling ability-imparting agent according to claim 1 ,
wherein the copolymer has a weight average molecular weight of 1,000 to 1,000,000.

3. A water treatment membrane, which is treated with the antifouling ability-imparting agent according to claim 1 .

Assignees

• Univ Nanyang Tech
• Nippon Catalytic Chem Ind

Inventors

• Goto Atsushi
• Wang Rong
• Tian Miao
• Miyoshi Yasuyuki
• Mizoguchi Hirotaka

Classifications

• C08F220/286 Primary

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

• B01D65/08

  Prevention of membrane fouling or of concentration polarisation · 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

• C08F220/282

  and containing two or more oxygen atoms · CPC title

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title