Composition for forming reverse osmosis membrane protection layer, method for preparing reverse osmosis membrane using same, reverse osmosis membrane, and water treatment module
AssigneeLG Chem, Ltd.
InventorsAyoung Lee, Sung Kyung Park, Chong Kyu Shin, Bong Ju Kwak
Life of this patent
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Abstract
The present specification provides a composition comprising a material of Chemical Formula 1: having a molecular weight of 500,000 to 700,000 where R1 and R2 are the same as or different from each other, and each independently is hydrogen, deuterium, or an alkyl group, and n is from 10,000 to 20,000, for forming a reverse osmosis membrane protective layer, a method for preparing a reverse osmosis membrane using the same, a reverse osmosis membrane and a water-treatment module.
Claims13
A composition for forming a reverse osmosis membrane protective layer, comprising a hydrophilic polymer, glutaraldehyde as a crosslinking agent, and a compound of Chemical Formula 1 having a weight average molecular weight of 500,000 to 700,000:
- wherein:
- R1 and R2 are the same as or different from each other, and each independently is hydrogen, deuterium, or a substituted or unsubstituted alkyl group;
- n is from 10,000 to 20,000;
- and
- wherein the material of Chemical Formula 1 is crosslinked with the hydrophilic polymer via the glutaraldehyde.
A method for preparing a reverse osmosis membrane comprising:
- forming a polyamide active layer on a porous support to yield the reverse osmosis membrane;
- and
- on the polyamide active layer forming a protective layer comprising a crosslinked product of a compound of the following Chemical Formula 1 crosslinked with a polyvinyl alcohol, wherein the crosslinked product comprises a reaction product of the polyvinyl alcohol with a crosslinking agent and the compound of Chemical Formula 1 having a weight average molecular weight of 500,000 to 700,000:
- wherein:
- R1 and R2 are the same as or different from each other, and each independently is hydrogen, deuterium, or a substituted or unsubstituted alkyl group;
- and
- n is from 10,000 to 20,000.
A reverse osmosis membrane, comprising:
- a porous support;
- a polyamide active layer provided on the porous support to yield the reverse osmosis membrane;
- and
- on the polyamide active layer a protective layer comprising a crosslinked product of a compound of the following Chemical Formula 1 crosslinked with a polyvinyl alcohol,
- wherein:
- the crosslinked product comprises a reaction product of the polyvinyl alcohol with glutaraldehyde as a crosslinking agent and the compound of Chemical Formula 1 having a weight average molecular weight of 500,000 to 700,000, and
- the reverse osmosis membrane comprising the protective layer exhibits salt rejection of 99.89% or greater and boron rejection of 93% or greater:
- wherein:
- R1 and R2 are the same as or different from each other, and each independently is hydrogen, deuterium, or a substituted or unsubstituted alkyl group;
- and
- n is from 10,000 to 20,000.
Dependencies are inferred from the claim text.