Crystalline polymer microporous membrane, its preparation method, and filter for filtration

A crystalline polymer, microporous membrane technology, used in other household appliances, chemical instruments and methods, membranes, etc., can solve problems such as particle leakage, and achieve the effect of long filtration life

Inactive Publication Date: 2011-12-28
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using a microporous membrane (0.04m 2 or smaller), rarely cause trouble, but when used in large areas (greater than 0.04m 2 ), which can cause particle leakage

Method used

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  • Crystalline polymer microporous membrane, its preparation method, and filter for filtration
  • Crystalline polymer microporous membrane, its preparation method, and filter for filtration
  • Crystalline polymer microporous membrane, its preparation method, and filter for filtration

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preparation example Construction

[0059] The production method of the crystalline polymer microporous membrane of the present invention includes at least a step of asymmetric heating and a stretching step, and if necessary, other steps such as a crystalline polymer film production step and a hydrophilization step.

[0060] The crystalline polymer microporous membrane of the present invention is prepared by the preparation method of the crystalline polymer microporous membrane.

[0061] Next, the crystalline polymer microporous membrane of the present invention will be described in detail through the description of the production method of the crystalline polymer microporous membrane of the present invention.

[0062] Note that in the following description, a film surface provided with a larger average pore diameter is described as a "non-heated surface", and a film surface provided with a smaller average pore diameter is described as a "heated surface". In this specification they are named as such only for con...

Embodiment 1

[0229]

[0230] To 100 parts by mass of polytetrafluoroethylene fine powder ("POLYFLON FINE POWDER FI04U", manufactured by Daikin Industries Ltd.) with a number average molecular weight of 6,200,000, 27 parts by mass of hydrocarbon oil ("ISOPER", available as extrusion aid) was added. obtained from Esso Oil Co., Ltd.), extruding the mixture in a round stick-shaped paste. The paste was rolled at a rolling speed of 30 m / min with a rolling roll heated to 60° C. to prepare a polytetrafluoroethylene film. The polytetrafluoroethylene film was passed through a hot air drying oven heated to 250° C. to dry and remove the extrusion aid to prepare an unfired polytetrafluoroethylene film with an average thickness of 120 μm, an average width of 150 mm, and a specific gravity of 1.55.

[0231] use Figure 4 The single-sided heater, by pressing the belt unit ( Figure 4 The "41" of ") under the pressing pressure of 1MPa, one surface of the obtained polytetrafluoroethylene and the annular...

Embodiment 2

[0247] Prepare the polytetrafluoroethylene microporous membrane of embodiment 2 in the same manner as embodiment 1, just use Figure 5 The single-sided heater described in replaces the single-sided heater in Example 1.

[0248] Described below Figure 5 The structure of the single-sided heater described in .

[0249] ●Heating roller (heater) ( Figure 5 "51")

[0250] Induction heating system, diameter: 300mm; width: 300mm; material: steel

[0251] ●Press belt unit ( Figure 5 "41")

[0252] Annulus ( Figure 5 "43"):

[0253] Width: 300mm; Length: 1,800mm; Thickness: 0.2mm; Material: SUS304H

[0254] endless belt roller ( Figure 5 "45")

[0255] Diameter: 100mm; Material: Steel

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Abstract

The present invention provides a method for producing a crystalline polymer microporous membrane, which comprises asymmetrically heating a crystalline polymer composed of said crystalline polymer and immobilized by a heating unit at a temperature equal to or higher than the melting point of a calcined product of the crystalline polymer. a film such that one surface of the film is heated while being in contact with the heating unit to form a semi-fired film having a temperature gradient in the thickness direction of the film composed of a crystalline polymer; and stretching the Semi-fired film.

Description

technical field [0001] The present invention relates to a crystalline polymer microporous membrane having high filtration efficiency and used for precise filtration of gas and liquid, etc., a method for producing the crystalline polymer microporous membrane, and a filter for filtration. Background technique [0002] Conventionally, microporous membranes are known and widely used in fields such as filters for filtration (see Non-Patent Document 1). As for the microporous membrane, there are, for example, a microporous membrane using cellulose ester as a material (see Patent Document 1 etc.), a microporous membrane using aliphatic polyamide as a material (see Patent Document 2 etc.), a polyfluorocarbon as a material A microporous film of a material (see Patent Document 3, etc.), a microporous film using polypropylene as a material (see Patent Document 4), and the like. [0003] These microporous membranes are used for filtration and sterilization of wash water for the electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D61/18B01D63/14B01D71/36B29C55/02B29K27/18B29K105/04B29L7/00B29L31/14
CPCB01D71/36B01D67/0093B01D2323/345B29C55/04B01D2323/08B29K2105/04B01D61/147B01D67/0027B29K2027/18B01D67/0088B29C55/005B01D2325/022B01D67/009B29C43/22B01D2323/42B01D63/14B29C55/12B01D2323/02B29B13/023Y10T428/249978
Inventor 外园裕久宫本公明
Owner FUJIFILM CORP
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