Microporous laminated membrane and method for producing the same

A technology for porous membranes and laminates, applied in separation methods, chemical instruments and methods, membranes, etc., can solve problems such as inability to ensure strength, and achieve the effects of sufficient strength, excellent air permeability, and high surface smoothness

Inactive Publication Date: 2015-10-28
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Roll-to-roll operations are often used in film processing, and sometimes there are problems such as inability to ensure the strength to withstand this operation.

Method used

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  • Microporous laminated membrane and method for producing the same
  • Microporous laminated membrane and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0155] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited by these examples. Tape peeling test, measurement of average pore diameter, measurement of average opening ratio (porosity) inside porous membrane, air permeability test, high temperature storage test, measurement of arithmetic average surface roughness Sa (surface roughness), measurement of tensile strength The measurement was performed by the following method.

[0156] (Tape Peeling Test)

[0157] (i) The following adhesive tape was pasted on the surface of the porous film of the porous film laminate, and the following roller was pressed against the bonded portion to press-bond the tape.

[0158] (ii) Using the following universal tensile testing machine, T-peeling was performed on the condition of 50 mm / min.

[0159] (iii) The presence or absence of peeling at the interface between the porous film and the heat-resistant nonwoven fabric bas...

manufacture example 1

[0182] Add to 100 parts by weight of polyamide-imide resin solution (trade name "VYLOMAX (バイロマックス) HR11NN" manufactured by Toyobo Co., Ltd.; solid content concentration 15% by weight, solvent NMP, solution viscosity 20dPa·s / 25°C) 35 parts by weight of polyvinylpyrrolidone (molecular weight: 55,000) is used as a water-soluble polymer to make a film-forming stock solution. A Teijin DuPont PET film (thickness 100 μm: trade name "HS74AS") was placed on a glass plate as a base material with the easy-adhesive side facing upward, and the stock solution maintained at 25°C was cast on the PET film using a film coater. film. During casting, the gap between the film coater and the PET film was 51 μm. After casting, it was quickly kept in a container at a humidity of about 100% and a temperature of 50° C. for 4 minutes. Thereafter, when immersed in water, solidified, and washed, the porous film was naturally peeled off from the PET film.

[0183] A porous film was obtained by natural d...

manufacture example 2

[0185] Polyvinylpyrrolidone (molecular weight: 55,000) was added to 100 parts by weight of polyetherimide resin solution (manufactured by GE Plastic in Japan, trade name "ULTEM (ultem) 1000P"; solid content concentration 18% by weight, solvent NMP) 30 Parts by weight are used as a water-soluble polymer to make a film-forming stock solution.

[0186] A Teijin DuPont PET film (thickness 100 μm: trade name “HS74AS”) was placed on a glass plate as a base material with the easy-adhesive side facing upward, and the stock solution maintained at 25° C. was cast on the glass plate using a film coater. on PET film. During casting, the gap between the film coater and the PET film was 51 μm. After casting, it was quickly kept in a container at a humidity of about 100% and a temperature of 50° C. for 4 minutes. Thereafter, the porous film was naturally peeled off from the PET film when it was immersed in water to solidify and washed. A porous film was obtained by natural drying at room ...

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Abstract

Disclosed is a microporous laminated membrane including a nonwoven-fabric substrate and a microporous membrane. The microporous membrane is disposed on at least one side of the nonwoven-fabric substrate. The microporous membrane includes a multiplicity of interconnecting micropores. The micropores have an average pore diameter of from 0.01 to 10 μm. The microporous membrane has an arithmetic mean surface roughness Sa of 0.5 μm or less. The microporous laminated membrane has an air permeability of from 0.5 to 30 seconds. The microporous laminated membrane has a tensile strength of 4.0 N/15 mm or more. The microporous laminated membrane does not undergo interfacial peeling between the substrate and the microporous membrane as a result of a tape peel test.

Description

technical field [0001] The present invention relates to a porous membrane laminate having micropores and handling strength, and a method of manufacturing the same. More specifically, it relates to a porous film laminate in which a porous film having a plurality of interconnected micropores is laminated on at least one surface of a nonwoven fabric base material, and a method for producing the same. Background technique [0002] As a porous membrane having micropores, for example, Patent Document 1 discloses a porous membrane composed of an amide-imide polymer or an imide polymer. A porous membrane is disclosed, which is characterized in that the thickness of the membrane is 5-200 μm, the average pore diameter of micropores is 0.01-10 μm, the porosity is 30-80%, and the air permeability representing the connectivity of micropores is The Gurley value is 0.2 to 29 seconds / 100cc. [0003] In addition, Patent Document 2 discloses a laminate in which a porous film is laminated on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/02B32B27/08B32B27/28B32B3/24B32B7/12H01M50/403H01M50/414H01M50/451H01M50/489H01M50/491H01M50/494
CPCB01D53/228B01D61/18B01D67/0013B01D67/0018B01D71/26B01D71/56B01D71/64B01D71/68B01D2053/221B07B1/4681H01M2/145H01M2/162H01M2/1686B32B3/266B32B5/022B32B7/12B32B27/12B32B27/28B32B27/281B32B27/286B32B2262/0253B32B2262/0261B32B2307/538B32B2307/724B32B2571/00B32B2457/00B32B2457/04B32B2457/10B32B2457/16H01M50/451H01M50/491H01M50/489H01M50/414H01M50/494H01M50/403B01D61/147B01D67/0009B01D69/02B01D69/10B01D2325/20B01D2325/24H01G11/52B32B27/285B32B27/34B32B2307/308B32B2307/54Y02E60/10H01M50/44Y02E60/13
Inventor 大和洋
Owner DAICEL CHEM IND LTD
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