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Methods for preparing polymer membranes on porous supports

A technology of porous scaffolds and polymer membranes, applied in chemical instruments and methods, membranes, membrane technology, etc.

Active Publication Date: 2015-09-23
CORNING INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, applying optimally permeable polymer membranes to highly porous scaffolds remains extremely challenging

Method used

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  • Methods for preparing polymer membranes on porous supports
  • Methods for preparing polymer membranes on porous supports
  • Methods for preparing polymer membranes on porous supports

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of prepolymer emulsion solution

[0054] For use in emulsion deposition, a prepolymer coating solution is prepared. A polymer precursor solution was prepared comprising 25% by weight DENO / D400 oligomer dissolved in toluene. Then, 8 g of the polymer precursor solution and 10 g of an aqueous 10 wt % sodium dodecyl sulfate (SDS) solution were combined. The mixture was shaken and vortexed to form a white viscous slurry, which was then diluted with 182 grams of deionized water to yield 200 mL of a prepolymer coating solution comprising 0.5 wt% SDS and 4 wt% organic phase. A magnetic stir bar was added and the emulsion was stirred vigorously for 3-16 hours before being used to coat the porous scaffold.

Embodiment 2

[0056] Effect of Surfactant Content on Emulsion Coated Polymer Films

[0057] exist image 3 A polymer film of DENO / D400 was prepared on a porous support using the emulsion prepared as described in Example 1 in a coating vessel. Specifically, emulsions containing 0.1 wt. % SDS, 0.5 wt. % SDS, and 5.0 wt. % SDS were tested to evaluate the effect of surfactant content in the emulsion on the quality of the polymer film. The emulsion coating was applied to two pre-coated porous scaffolds with average pore sizes of 0.2 μm and 0.01 μm. Average pore sizes of 0.01 μm and 0.2 μm were obtained by coating precoat slips of different particle sizes onto bulk porous scaffolds used as-is.

[0058] The membrane channels of the porous scaffold are filled with emulsion from top to bottom, and the emulsion is allowed to filter through the porous scaffold. The coatings were evaluated by drying the porous scaffolds by leaving them at room temperature (25° C.) for 16 hours, followed by vacuum te...

Embodiment 3

[0064] Slurry Coated Polymer Film

[0065] Additional DENO / D400 polymer membranes were applied to porous scaffolds with average pore sizes of 0.2 μm and 0.01 μm by slip coating. The slip (12.5% ​​by weight DENO / D400 in toluene) was coated with a prepolymer coating solution, filling the channels of the porous scaffold from bottom to top. A back pressure of about 60 kPa is applied from the outer wall into the channel. Allow the coating slip to remain in the channel for 2 minutes, then drain. A brief vacuum (10 seconds) was applied to drive excess coating solution from the channel. The porous scaffolds were removed from the coating containers, allowed to dry overnight (16 hours), and cured at 150°C (4-18 hours under nitrogen). Examine the porous scaffold to determine the mass gain and vacuum-tightness of the polymer membrane.

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Abstract

Methods for preparing a polymer membrane on a porous support may include providing a porous support having an outer wall, a first end, a second end, and porous channel surfaces that define a plurality of channels through the porous support from the first end to the second end. The plurality of channels includes membrane channels. The channel surfaces that define the membrane channels are membrane-channel surfaces. The polymer membrane may be coated onto the porous support by first establishing a pressure differential between the outer wall and the plurality of channels. Then, a pre-polymer solution may be applied to the membrane-channel surfaces and, optionally, the first and second ends, by slip coating or emulsion coating while the pressure differential is maintained. This results in formation of a pre-polymer layer on at least the membrane-channel surfaces. Then, the pre-polymer layer may be cured to form the polymer membrane.

Description

[0001] This application claims priority under 35 U.S.C. § 119 to U.S. Provisional Application Serial No. 61 / 655,692, filed June 5, 2012, the contents of which are based upon and are hereby incorporated by reference in their entirety. Background of the invention [0002] field [0003] The present invention relates generally to pervaporation membranes and, in particular, to methods of coating polymeric pervaporation membranes onto porous ceramic supports. technical background [0004] Pervaporation is a term derived from a process that includes a permeation step and an evaporation step. Upon pervaporation, a feed such as a fluid (ie, liquid or gas) mixture may be allowed to permeate into the membrane. The membrane can be selected so that desired components of the fluid mixture are adsorbed into and transported across the membrane at a higher rate than other components in the liquid mixture. The permeate fluid can then be evaporated to desorb from the membrane and form a "pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/06B01D67/00B01D69/14B01D71/46B01D71/60
CPCB01D63/066B01D61/362B01D69/105B01D71/48B01D69/148B01D67/0006B01D2323/40B01D2323/10B01D67/0079B01D65/108B01D61/366B01D71/027B01D67/00793B01D67/00791B01D69/1213
Inventor T·常D·费雷格力R·R·小汉考克T·N·赫希R·D·帕特里奇E·尤里西斯
Owner CORNING INC
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