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Porous composite membrane

A thin film and microporous technology, applied in the direction of membrane, membrane technology, semi-permeable membrane separation, etc., can solve the problem of prolonged flow time

Active Publication Date: 2014-07-16
ENTEGRIS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because improving particle retention by reducing the pore size results in longer flow times due to the smaller pore size

Method used

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  • Porous composite membrane
  • Porous composite membrane
  • Porous composite membrane

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0090] For only 5 nm scale asymmetric UPE microporous membranes, 5 nm scale asymmetric UPE microporous membranes layered with approximately 0.2 μm scale nylon nanofiber layers and 5 nm scale asymmetric UPE with approximately 0.2 μm scale nylon microporous membranes Microporous membranes are tested for particle retention and pressure drop. In this example, the 0.2 micron scale nanofiber layer is based on the IPA bubble point of the nanofiber layer, which is between about 21 psi and about 25 psi; the IPA bubble point of a 0.25 micron scale UPE film in IPA under similar conditions Between 20psi and 29psi. 5nm level asymmetric UPE microporous film is approved by 3M TM The bubble point measurement in HFE-7200 is characterized by the bubble point being between 95 psi and 110 psi.

[0091] Under the test conditions (25 nm negatively charged fluorescent PSL particles in water, using filter members or microporous membranes and feed solution treated with 0.1% Triton X-100), there is ...

example 2

[0104] This example compares polyamide nanofiber layer, polyamide nanofiber layer, 25 nm fluorescent particle retention and bubble point and isopropanol flow time of various size classes of UPE microporous films and combinations of polyamide nanofiber layers and microporous UPE films.

[0105] Microporous UPE film coupon samples for particle retention tests alone or in combination with polyamide nanofiber layers to prepare filter member coupons. Microporous UPE films were obtained from Integrity Corporation (Chaska, MN). The UPE microporous film samples evaluated in this example included a 0.01 micron scale (on 3M TM Bubble point in HFE-7200 is 70psi to 83psi), 0.02 micron rating (at 3M TM Bubble point in HFE-7200 is 55psi to 64psi), 0.03 micron grade (bubble point in IPA is 68psi to 83psi) and 0.05micron grade (bubble point in IPA is 50psi to 63psi) UPE film. The nanofiber layer is prepared by Jiatai Company and is polyamide. Microporous film test piece samples were 90 m...

example 3

[0117] This example measures three 4-inch optimizers Pressure drop, particle efflux testing, and particle retention of D-size filter cartridge devices made only from asymmetric microporous UPE membranes or from nylon nanofibers on a nylon nonwoven support with the same asymmetric microporous The combination of UPE film is made. Optimizer D filters were manufactured by Integra, Chaska, MN. The filter cartridge devices prepared for this example were evaluated by Pressure Drop Test, Particle Retention Test and Particle Shedding Test. A cartridge filter unit (optimizer D Asy 5nm) was fabricated from Integra’s 5nm asymmetric UPE film, while the other two devices (Optimizer D Asy 5nm SP) is made of 5nm asymmetric UPE film and 0.2μm grade nylon nanofiber layer (abbreviated as NNF1+UPE or NNF2+UPE).

[0118] Additional information on the filter cartridge assemblies is summarized in Table 3.

[0119] Table 3. Summary of Example 3 Cartridge Assembly Components.

[0120]

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Abstract

Embodiments of the present invention include liquid filtration components that include a polymer nanofiber layer overlying a microporous membrane. The pressure drop of the filter member is substantially the same as or less than the pressure drop of the microporous membrane, and the particle retention of the filter member in the presence of a surfactant is greater than that of the microporous membrane alone under the same test conditions Particle retention of the film.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 168,776, filed April 13, 2009, the contents of which are incorporated herein by reference. technical field Background technique [0003] US Publication No. 2008 / 0217239 discloses a composite media liquid filter having nanomesh sheets adjacent to and optionally bonded to a microporous membrane. The microporous film is characterized in that the LRV value is 3.7 at the nominal particle size, and the fractional filtration efficiency of the nanomesh is greater than 0.95 at the nominal particle size of the microporous film. According to the disclosure, the nanomesh can be produced by electrospinning or electroblowing. According to the disclosure, the composite media can be used in filter cartridge form, in flat panel or cylindrical unit form and can be used in a variety of filtration process applications, such as filtering both gas and liquid st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00
CPCB01D69/12B01D67/0088B01D2323/39B01D69/1216B01D71/261B01D71/56B01D69/1071B01D2239/025B01D2325/022B01D2323/12B01D2323/216B01D2325/04B32B2307/718
Inventor 外明·乔片冈公典
Owner ENTEGRIS INC
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