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Processes for forming permanent hydrophilic porous coatings onto a substrate, and porous membranes thereof

A porous membrane, permanent technology, applied in coatings, chemical instruments and methods, membranes, etc., can solve problems such as ineffectiveness

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

Drying of the film may render it ineffective and may require, for example, undesirable shipping considerations (e.g. wet shipping)

Method used

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  • Processes for forming permanent hydrophilic porous coatings onto a substrate, and porous membranes thereof
  • Processes for forming permanent hydrophilic porous coatings onto a substrate, and porous membranes thereof
  • Processes for forming permanent hydrophilic porous coatings onto a substrate, and porous membranes thereof

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 from Celanese Ltd.) was added to a 500 mL round bottom flask along with anhydrous DMSO (175 mL) and stirred vigorously 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 into a 5:1 mixture of isopropanol:ether (total 800 mL). The fluffy white solid was dried under vacuum at room temperature. 1 H NMR showed that about 2.4% of the repeat units contained the graftable methacrylate linkage (21.5 g, 91% yield, 42% conversion).

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 from Celanese Ltd.) along with anhydrous DMSO (150 mL) was added to a 500 mL three necked round bottom flask and stirred vigorously 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 into a 3:1 mixture of isopropanol:ether (700 mL total). The fluffy white solid was dried under vacuum at room temperature. 1 H NMR showed that about 5% of the repeat units contained the graftable methacrylate linkages (24.0 g, 80% yield, 39% conversion).

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 from Celanese Ltd.) was added to a 500 mL round bottom flask along with DMSO (200 mL) and stirred vigorously at 75°C until a homogeneous solution was obtained. The reaction was cooled to 45 °C, 4-(dimethylamino)pyridine (2.22 g, 18.2 mmol) and 2-isocyanatoethyl methacrylate (1.41 g, 9.09 mmol) were slowly added to the vigorously stirred in the solution. The viscous solution was stirred for 24 hours, then cooled to room temperature. The polymer was precipitated into isopropanol (1200 mL total). The fluffy white solid was dried under vacuum at 40°C. 1 H NMR showed that about 1.4% of the repeat units contained the graftable methacrylate linkages (20.8 g, 97% yield, 70% conversion).

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Abstract

The invention relates to a process for forming permanent hydrophilic porous coatings onto a substrate, and porous membranes 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 onto a base membrane and subsequently irradiated with a high energy source to permanently form a hydrophilic surface. Background technique [0002] Fluoropolymers such as polytetrafluoroethylene (PTFE) and expanded PTFE (expanded PTFE, ePTFE) are mechanically strong, high temperature and chemically inert materials. These favorable properties result from the high strength of the carbon-fluorine bond, which reduces chemical degradation. Membranes are typically formed from porous fluoropolymers due to their chemical inertness and mechanical stability. However, due to the hydrophobic nature of these classes of fluoropolymers, liquid water filtration is problematic and may require treatment to render them hydrophilic. [0003] Hydrophilicity is defined as the property of being "water-loving". Hydrophilicity is typically used to describe the property...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/18C08J7/04
CPCC08J7/18B01D2323/34B01D2323/02C08J2329/04C08J2327/18B01D69/02B01D2323/385B01D67/0093B01D71/36B01D71/78C08F2/54C08J7/16C08J9/365D06M14/18B01D67/00931
Inventor D·R·穆尔H·M·杜R·A·哈钦森
Owner PARKER HANNIFIN CORP
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