Composite membrane comprising highly permeable gutter layer and method for preparing same

Patent metadata

Field	Value
Publication number	US-12420240-B2
Application number	US-202118005455-A
Country	US
Kind code	B2
Filing date	Jul 15, 2021
Priority date	Jul 15, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

The present disclosure relates to a composite membrane in which a rubbery polymer is introduced into a gutter layer to suppress the physical aging of the highly permeable composite membrane, and more particularly, to a composite membrane comprising a porous support layer; a gutter layer on the porous support layer; and an active layer on the gutter layer, wherein the gutter layer comprises a blend of poly(l-trimethlsilyl-l-propyne) (PTMSP) and a rubbery polymer and a method for preparing the same. The composite membrane according to the present disclosure has high permeation performance and a remarkable decline in physical aging leading to a decrease in permeability over time and thus has very high industrial applicability.

First claim

What is claimed is:

1. A composite membrane, comprising:
a porous support layer;
a gutter layer on the porous support layer; and
an active layer on the gutter layer,
wherein the gutter layer comprises a blend of poly(l-trimethylsilyl-l-propyne) (PTMSP) and a rubbery polymer,
wherein a mix ratio of the poly (l-trimethylsilyl-l-propyne) (PTMSP) and the rubbery polymer in the polymer blend ranges from 9:1 to 5:5 by weight.

2. The composite membrane according to claim 1 , wherein the porous support layer is at least one polymer selected from polysulfone, polyethersulfone, polyetherethersulfone, polyphenylsulfone, polyacrylonitrile, polyetherimide, polyimide, polyamide, polyimide-amide, polyethylene, polyethyleneterephthalate, polyetherketone, polyetheretherketone, polyurethane, nylon and polyvinylidenefluoride.

3. The composite membrane according to claim 1 , wherein the active layer is at least one polymer selected from acetylated methyl cellulose, polymers of intrinsic microporosity, thermally rearranged polymers and perfluoropolymers.

4. The composite membrane according to claim 1 , wherein the rubbery polymer is at least one polymer selected from polydimethlysiloxane (PDMS), silicone-based rubber, polybutadiene, nitrile rubber, acrylic rubber, butyl rubber, polyisoprene and poly (styrene-co-butadiene).

5. A method for preparing a composite membrane, comprising:
forming a porous support layer;
forming a gutter layer of a blend of (l-trimethylsilyl-l-propyne) (PTMSP) and rubbery polymer on the porous support layer; and
forming an active layer on the gutter layer
wherein a mix ratio of the poly (l-trimethylsilyl-l-propyne) (PTMSP) and the rubbery polymer in the polymer blend ranges from 9:1 to 5:5 by weight.

6. The method for preparing a composite membrane according to claim 5 , wherein the step of forming the gutter layer comprises preparing a mixed solution of the poly (l-trimethylsilyl-l-propyne) (PTMSP) and the rubbery polymer using an organic solvent and forming a film on water by water casting.

7. The method for preparing a composite membrane according to claim 6 , wherein the organic solvent in the step of forming the gutter layer is at least one selected from chloroform, dipropylamine, isobutanol, cyclohexene, butanol, isovaleric acid, ethylether, isoamyl alcohol, ethylacetate, pentanol, 2-pentanone, hexanol, heptanol, acetic anhydride, pentyl acetate, octanol, cyclohexane, 2-hexanone, n-butyronitrile, diethylcarbonate, cyclohexanol, heptaldehyde, t-butyl chloride, benzyl alcohol, nitromethane, diisobutyl ketone, aniline and acetophenone.

8. The method for preparing a composite membrane according to claim 6 , wherein the mixed solution in the step of forming the gutter layer comprises the poly(l-trimethylsilyl-l-propyne) (PTMSP) and the rubbery polymer in an amount ranging from 0.01 to 10 weight %.

Assignees

• Korea Res Inst Chemical Tech

Inventors

• Moon Su Young
• Lee Jong Myeong
• Chang Bong Jun
• Kong Chang In
• Lee Jae-Hyeok

Classifications

• B01D71/701

  Polydimethylsiloxane · CPC title

• B01D71/643

  Polyether-imides · CPC title

• B01D69/106

  Membranes in the pores of a support, e.g. polymerized in the pores or voids · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D71/44

  Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of groups B01D71/26-B01D71/42 · CPC title