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Non-dewetting porous membranes

一种亲水性基团、氟碳的技术，应用在膜、膜技术、半透膜分离等方向，能够解决薄多孔膜破裂、昂贵、密封孔膜耗时等问题

Active Publication Date: 2014-12-31
ENTEGRIS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This pressurized intrusion process is time consuming, expensive and ineffective for sealing porous membranes and can lead to rupture of thin porous membranes
Also, this process does not ensure complete intrusion of water into most of the pores in the membrane

Method used

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  • Non-dewetting porous membranes
  • Non-dewetting porous membranes
  • Non-dewetting porous membranes

Examples

Experimental program
Comparison scheme
Effect test

example

[0135] General Synthetic Methods and Test Procedures

[0136] A fluorocarbon liquid composition comprising from about 0.4 wt% to about 4 wt% of one or more fluorinated ionomers having an equivalent weight of from about 380 g / equivalent to about 620 g / equivalent (as in Table 3 of Example 2 described in ) to coat microporous membrane supports. Fluorinated ionomers derived from CF 2 = CF-O-CF 2 CF 2 SO 2 F monomer unit, tetrafluoroethylene, formula CH 2 =CH-(CF 2 ) 6 -CH=CH 2 The diene unit and iodinated chain transfer agent I-(CF 2 ) 4 -I. Dissolve the ionomer in a fluorocarbon solvent such as methyl perfluorobutyl ether (Novik TM HFE-7100), perfluoropolyether solvents (such as glue SV90) or a combination of these. These ionomer solutions were obtained from Solvay Sulex and optionally filtered prior to use using a filtration microporous membrane of 0.45 micron, 0.2 micron or smaller nominal pore size. Non-limiting examples of combinations of ionomers, free radica...

example 1

[0158] According to the emulsion polymerization procedure disclosed in U.S. Patent No. 6,902,676, by combining TFE with formula CF 2 = CF-O-CF 2 CF 2 -SO 2 Copolymerize vinyl ethers of F to obtain copolymers using the formula CH 2 CH-C 6 f 12 -CHCH 2 Diolefins as pre-crosslinkers, using I-C 4 f 8 -I as chain transfer agent and potassium persulfate as free radical initiator. Copolymers C1, C2, C3 and C4 were obtained under the following conditions shown in Table 2:

[0159] Table 2. Conditions for obtaining copolymers C1, C2, C3 and C4.

[0160]

example 2

[0162] This example discloses the preparation of a fluorinated ionomer coating solution for use in forms of the invention. The pre-crosslinked perfluoroionomer (with iodine chain ends) prepared in Example 1 was dissolved in a partially fluorinated or perfluorinated solvent to achieve a final concentration of about 4 wt%. The mixture was then centrifuged at 10,000 rpm for two hours. A solution S2 * Centrifuge for an additional two hours at 20,000 rpm. A clear transparent liquid was obtained after removal of the insoluble residue, which exhibited the physical properties summarized in Table 3 below:

[0163] Table 3. Solutions S1, S2, S2 * , physical properties of S3 and S4.

[0164]

[0165] After dissolving 40 mg of the copolymer in 0.6 ml of hexafluorobenzene, the molar percentage of comonomer was determined by means of NMR and the equivalent weight was subsequently calculated.

[0166] The iodine content of the ionomer was measured by X-ray fluorescence (XRF) and meas...

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Abstract

The present invention discloses non-drying microporous membrane composites. These microporous membrane composites were wetted by a solution of methanol and water and were non-drying after autoclaving in water. The microporous membrane composite includes a microporous membrane support coated with a cross-linked ionomer including a hydrophilic group. The microporous membrane composite has an average isopropanol flow loss of less than 82% compared to the microporous membrane support.

Description

[0001] Related Application Cross Reference [0002] This application claims the benefit of US Provisional Application No. 61 / 166,879 filed April 6, 2009 under Applicant Reference No. 200800038P, the entire contents of which are incorporated herein by reference. technical field Background technique [0003] Porous membranes are used to filter various liquids and gases and to remove contaminants such as particles, tissue debris, cells, microorganisms, air bubbles, gel particles, etc. from these fluids. These porous membranes can be formed from polymeric compositions, metals, ceramics, and / or biological compositions, and can have controlled and measurable porosity, pore size and pore size distribution, and specified thickness. The porous membrane can be used alone or can be incorporated into a filter device (eg, a cartridge) that can be inserted into a fluid flow to effect removal of particles and the like from the fluid. [0004] The porous membrane is chemically resistant t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22
CPCB01D69/02B01D67/0088B01D69/125B01D2323/02B01D2325/36C08J2327/12B01D65/10B01D2323/30C08J2327/18C08J3/098C08J7/04C08K5/14C08L27/12C08L71/00C08K5/02C08K5/0025C08J5/2237B01D71/32B01D71/52B01D67/0006B01D71/36B01D2323/40B01D2325/20
Inventor 阿尔科塔·约卡文·阿娜塔·拉曼马蒂亚斯·格贝特克劳迪奥·奥尔达尼亚历山德罗·吉耶米
Owner ENTEGRIS INC
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