US2017030009A1PendingUtilityA1

Porous support, preparation method therefor, and reinforced membrane containing same

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Assignee: KOLON FASHION MAT INCPriority: Feb 25, 2014Filed: Feb 25, 2015Published: Feb 2, 2017
Est. expiryFeb 25, 2034(~7.6 yrs left)· nominal 20-yr term from priority
Inventors:Sung Jin KimHeung Ryul OhYong-Hwan LeeHwan Kwon RhoChul Ki KimJeong Young ChoiJun Young ParkJi Suk Baek
D01F 1/10D01D 10/06D01D 1/02D06M 11/46D06M 10/025D06M 2101/30D01F 6/74D01D 5/003D04H 1/4326D04H 1/4382D10B 2401/10D04H 1/43838D04H 1/728D06M 11/00
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Claims

Abstract

The present invention relates to a porous support, a method for manufacturing the same, and a reinforced membrane comprising the same, the porous support comprising a nanoweb in which nanofibers are accumulated in the form of a nonwoven fabric including a plurality of pores, wherein the nanoweb has a moisture saturation time of 1 second to 600 seconds. The porous support not only has excellent durability, heat resistance, and chemical resistance while exhibiting excellent air permeability and water permeability, but also has good hydrophilicity.

Claims

exact text as granted — not AI-modified
1 . A porous support comprising a nanoweb in which nanofibers are integrated in the form of a non-woven fabric including a plurality of pores,
 wherein the nanoweb has a moisture content saturation time of 1 sec to 600 sec.   
     
     
         2 . The porous support according to  claim 1 , wherein the nanoweb has a moisture regain of 3.0% by weight or more. 
     
     
         3 . The porous support according to  claim 1 , wherein the nanoweb has wettability in accordance with wicking test, of 2 to 15 cm. 
     
     
         4 . The porous support according to  claim 1 , wherein the nanoweb has a contact angle of 90° or less. 
     
     
         5 . The porous support according to  claim 1 , wherein the nanofiber comprises 0.1 to 20 parts by weight of a polymer hydrophilic additive, with respect to 100 parts by weight of the nanofiber. 
     
     
         6 . The porous support according to  claim 1 , wherein a hydrophilic additive is impregnated in the pores of the nanoweb. 
     
     
         7 . The porous support according to  claim 1 , wherein a hydrophilic additive is coated on one or two surfaces of the nanoweb. 
     
     
         8 . The porous support according to  claim 5 , wherein the hydrophilic additive is selected from the group consisting of TiO 2  anatase, TiO 2  rutile, TiO 2  brookite, tin dioxide (SnO), zirconium dioxide (ZrO 2 ), aluminium oxide (Al 2 O 3 ), oxidized single-walled carbon nanotubes, oxidized multiwalled carbon nanotubes, graphite oxide, graphene oxide and a combination thereof. 
     
     
         9 . The porous support according to  claim 5 , wherein the hydrophilic additive is selected from the group consisting of polyhydroxyethylmethacrylate, polyvinylacetate, polyurethane, polydimethylsiloxane, polyimide, polyamide, polyethyleneterephthalate, polymethylmethacrylate, epoxy and a combination thereof. 
     
     
         10 . The porous support according to  claim 5 , wherein the hydrophilic additive has a mean diameter of 0.005 to 1 μm. 
     
     
         11 . The porous support according to  claim 1 , wherein the nanofiber comprises a polyimide nanofiber. 
     
     
         12 . The porous support according to  claim 11 , wherein the polyimide has a main chain comprising a substituent selected from the group consisting of an amine group, a carboxyl group, a hydroxyl group and a combination thereof. 
     
     
         13 . The porous support according to  claim 12 , wherein the polyimide is prepared by polymerizing diamine, dianhydride and a comonomer containing a hydroxyl group to prepare polyamic acid and then imidizing the polyamic acid. 
     
     
         14 . The porous support according to  claim 13 , wherein the comonomer containing a hydroxyl group is selected from the group consisting of dianiline containing a hydroxyl group, diphenyl urea containing a hydroxyl group, diamine containing a hydroxyl group and a combination thereof. 
     
     
         15 . The porous support according to  claim 1 , wherein One or two surfaces of the nanoweb is plasma-treated. 
     
     
         16 . The porous support according to  claim 1 , wherein an inorganic substance is deposited on one or two surfaces of the nanoweb. 
     
     
         17 . The porous support according to  claim 16 , wherein the inorganic substance is selected from the group consisting of TiO 2  anatase, TiO 2  rutile, TiO 2  brookite, tin dioxide (SnO), zirconium dioxide (ZrO 2 ), aluminium oxide (Al 2 O 3 ), oxidized single-walled carbon nanotubes, oxidized multiwalled carbon nanotubes, graphite oxide, graphene oxide and a combination thereof. 
     
     
         18 . A method of producing a porous support comprising:
 adding diamine and dianhydride to a solvent to prepare an electrospinning solution;   electrospinning the prepared electrospinning solution to produce a polyamic acid nanoweb in which nanofibers are integrated in the form of a non-woven fabric including a plurality of pores; and   imidizing the polyamic acid nanoweb to produce a polyimide nanoweb,   wherein the polyimide nanoweb has a moisture content saturation time of 1 sec to 600 sec.   
     
     
         19 . The method according to  claim 18 , wherein a comonomer containing a hydroxyl group is further added to the electrospinning solution. 
     
     
         20 . The method according to  claim 18 , wherein the nanofibers present in the polyimide nanoweb have a main chain substituted by a substituent selected from the group consisting of an amine group, a carboxyl group, a hydroxyl group and a combination thereof. 
     
     
         21 . A method of producing a porous support comprising electrospinning an electrospinning solution to produce a nanoweb in which nanofibers are integrated in the form of a non-woven fabric including a plurality of pores,
 wherein the nanoweb has a moisture content saturation time of 1 sec to 600 sec.   
     
     
         22 . The method according to  claim 21 , wherein a hydrophilic additive is further added to the electrospinning solution. 
     
     
         23 . The method according to  claim 21 , further comprising:
 impregnating a hydrophilic additive in pores of the nanoweb.   
     
     
         24 . The method according to  claim 21 , further comprising:
 coating a hydrophilic additive on one or two surfaces of the nanoweb.   
     
     
         25 . The method according to  claim 21 , further comprising:
 plasma-treating one or two surfaces of the nanoweb.   
     
     
         26 . The method according to  claim 25 , wherein the plasma treatment is carried out by treating one or two surfaces of the nanoweb with gas for imparting a hydrophilic group using low-temperature plasma or radio frequency (RF) plasma. 
     
     
         27 . The method according to  claim 21 , further comprising:
 depositing an inorganic substance on one or two surfaces of the nanoweb.   
     
     
         28 . The method according to  claim 27 , wherein the deposition of the inorganic substance is carried out by sputtering. 
     
     
         29 . A reinforced membrane comprising:
 the porous support according to  claim 1 ; and   an ion exchange polymer filling pores of the porous support.   
     
     
         30 . The porous support according to  claim 6 , wherein the hydrophilic additive is selected from the group consisting of TiO 2  anatase, TiO 2  rutile, TiO 2  brookite, tin dioxide (SnO), zirconium dioxide (ZrO 2 ), aluminium oxide (Al 2 O 3 ), oxidized single-walled carbon nanotubes, oxidized multiwalled carbon nanotubes, graphite oxide, graphene oxide and a combination thereof. 
     
     
         31 . The porous support according to  claim 6 , wherein the hydrophilic additive is selected from the group consisting of polyhydroxyethylmethacrylate, polyvinylacetate, polyurethane, polydimethylsiloxane, polyimide, polyamide, polyethyleneterephthalate, polymethylmethacrylate, epoxy and a combination thereof. 
     
     
         32 . The porous support according to  claim 6 , wherein the hydrophilic additive has a mean diameter of 0.005 to 1 μm. 
     
     
         33 . The porous support according to  claim 7 , wherein the hydrophilic additive is selected from the group consisting of TiO 2  anatase, TiO 2  rutile, TiO 2  brookite, tin dioxide (SnO), zirconium dioxide (ZrO 2 ), aluminium oxide (Al 2 O 3 ), oxidized single-walled carbon nanotubes, oxidized multiwalled carbon nanotubes, graphite oxide, graphene oxide and a combination thereof. 
     
     
         34 . The porous support according to  claim 7 , wherein the hydrophilic additive is selected from the group consisting of polyhydroxyethylmethacrylate, polyvinylacetate, polyurethane, polydimethylsiloxane, polyimide, polyamide, polyethyleneterephthalate, polymethylmethacrylate, epoxy and a combination thereof. 
     
     
         35 . The porous support according to  claim 7 , wherein the hydrophilic additive has a mean diameter of 0.005 to 1 μm.

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