Processes for forming a permanent hydrophilic surface on a porous membrane

A technology of hydrophilic coating and basic membrane, applied in the direction of coating, membrane, membrane technology, etc., can solve the problem of increased transportation weight

Active Publication Date: 2009-07-29
PARKER HANNIFIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other non-compliance can include economic factors such as special handling and sealable containers required, increased shipping weight, etc.

Method used

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  • Processes for forming a permanent hydrophilic surface on a porous membrane
  • Processes for forming a permanent hydrophilic surface on a porous membrane
  • Processes for forming a permanent hydrophilic surface on a porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, a functionalized PVA was synthesized and referred to as PVA-MMA(2.4)-high MW. PVA (20.1 g, 456 mmol, Celvol 165, purchased from Celanese Ltd.) was added to a 500 mL round bottom flask with anhydrous DMSO (175 mL) and vigorously stirred at 75 °C until a homogeneous solution was obtained. The reaction was cooled to 40 °C and 2-isocyanatoethyl methacrylate (3.53 g, 22.8 mmol) was slowly added to the vigorously stirred solution. The viscous solution was stirred for 24 hours, then cooled to room temperature. The polymer was precipitated in a 5:1 mixture of isopropanol:ether (total 800 mL). The flocculated white solid was dried under vacuum at room temperature. 1 H NMR indicated that approximately 2.4% of the repeat units contained graftable methacrylate linkages (21.5 g, 91% yield, 42% conversion). 1 H NMR (D 2 O, 400MHz) δ6.13 (1H, bs, CHH=CMe), 5.72 (1H, bs, CHH=CMe), 4.24 (2H, bm, CH 2 CH 2 ), 4.1-3.5 (43H, bm, CH of PVA), 3.45 (2H, bm, CH 2 CH 2 ...

Embodiment 2

[0051] In this example, a functionalized PVA was synthesized and referred to as PVA-MMA(5.0)-high MW. PVA (20.1 g, 456 mmol, Celvol 165, purchased from Celanese Ltd.) was added to a 500 mL three-necked round bottom flask with anhydrous DMSO (150 mL) and vigorously stirred at 95 °C until a homogeneous solution was obtained. The reaction was cooled to room temperature and 2-isocyanatoethyl methacrylate (10.1 g, 65.1 mmol) was slowly added to the vigorously stirred solution in an ice bath to control any exotherm. The viscous solution was stirred at 40 °C for 24 hours, then cooled to room temperature. The polymer was precipitated in a 3:1 mixture of isopropanol:ether (total 700 mL). The flocculated white solid was dried under vacuum at room temperature. 1 H NMR indicated that approximately 5% of the repeat units contained graftable methacrylate linkages (24.0 g, 80% yield, 39% conversion). 1 H NMR (DMSO-d 6 , 400MHz) δ6.13 (1H, bs, CHH=CMe), 5.72 (1H, bs, CHH=CMe), 4.95 (1H, b...

Embodiment 3

[0052] In this example, a functionalized PVA was synthesized and referred to as PVA-MMA(1.4)-high MW. PVA (20.0 g, 454 mmol, Celvol 165, purchased from Celanese Ltd.) was added to a 500 mL three necked round bottom flask with DMSO (200 mL) and vigorously stirred at 75 °C until a homogeneous solution was obtained. The reaction was cooled to 45 °C, and to the vigorously stirred solution were slowly added 4-(dimethylamino)pyridine (2.22 g, 18.2 mmol) and 4-isocyanatoethyl methacrylate (1.41 g, 9.09 mol) . The viscous solution was stirred for 24 hours, then cooled to room temperature. The polymer precipitated into isopropanol (total 1200 mL). The flocculated white solid was dried under vacuum at 40 °C. 1 H NMR indicated that approximately 1.4% of the repeat units contained graftable methacrylate linkages (20.8 g, 97% yield, 70% conversion). 1 H NMR (DMSO-d 6 , 400MHz) δ6.07 (1H, bs, CHH=CMe), 5.67 (1H, bs, CHH=CMe), 4.95 (1H, bm, OH of PVA), 4.67 (14H, bm, OH of PVA), 4.47 (...

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Abstract

The invention discloses a permanent hydrophilic porous coating on a substrate, and porous membrane thereof. A membrane includes a base membrane; and an electron beam functionalized coating, the coating comprising a polyvinyl alcohol, a polyvinyl alcohol-polyvinyl amine copolymer, a polyvinyl amine, and derivatives thereof functionalized with an electron beam reactive group adapted to form a radical under high energy irradiation. Also disclosed are processes for forming the membrane.

Description

technical field [0001] The present disclosure generally relates to functionalized hydrophilic polymer derivatives that are coated on a base film and subsequently irradiated with high energy sources to permanently form a hydrophilic surface. Background technique [0002] Fluoropolymers such as polytetrafluoroethylene (PTFE) and expanded PTFE (ePTFE) are mechanically robust, high temperature resistant and chemically inert materials. These beneficial properties are obtained from the high strength of the carbon-fluorine bond which mitigates chemical degradation. Membranes are often formed from porous fluoropolymers because of their chemical inertness and mechanical stability. However, because of the hydrophobic nature of these types of fluoropolymers, liquid water penetration is problematic and may require treatment to render them hydrophilic. [0003] Hydrophilicity is defined as the property of "water-loving". Hydrophilicity is commonly used to describe the properties of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08L29/04C08L33/02C08L33/08C08L39/02C08J5/18C08J3/28
CPCC08L39/02C08L29/04C09D139/02B01D69/02B01D2325/34B01D2323/02C09D129/04B01D2323/385B01D67/0093Y10T428/249991C08L2666/04B01D71/32B01D71/36B01D71/78C08F2/54C08J7/16C08J7/18C08J9/365D06M14/18
Inventor D·R·穆尔H·M·杜R·A·哈钦森
Owner PARKER HANNIFIN CORP
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