Vinylidene fluoride resin porous film and manufacturing method therefor

A technology of ethylene difluoride and its manufacturing method, which is applied in the field of porous membranes and can solve problems such as excessively large average pore diameter of porous membranes and maintenance of water permeability

Inactive Publication Date: 2012-03-07
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this point of view, the average pore diameter of the porous membrane disclosed in Patent Document 6 below is too large, and the hollow fiber porous membrane disclosed in Patent Document 8 below has a problem in maintaining the water permeation rate in the continuous filtration operation of turbid water.

Method used

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  • Vinylidene fluoride resin porous film and manufacturing method therefor
  • Vinylidene fluoride resin porous film and manufacturing method therefor
  • Vinylidene fluoride resin porous film and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Using a Henschel mixer, the weight average molecular weight (Mw) was 4.1×10 5 The substrate is polyvinyl difluoride (PVDF-I) (powder) and Mw is 9.7×10 5 Polyvinylidene fluoride (PVDF-II) (powder) for modifying the crystallization characteristics of the 1,1-difluoroethylene (PVDF-II) (powder) is mixed according to the ratio of 75% by weight and 25% by weight respectively, and the obtained Mw is 5.4×10 5 PVDF mixture (mixture A; crystallization temperature Tc after film formation = 150.4° C.).

[0124] As the plasticizer, adipic acid-based polyester-based plasticizer (polyester of adipic acid and 1,2-butanediol terminated with isononyl alcohol; "D623N" manufactured by Geeyi Plus Co., Ltd., number The average molecular weight is about 1800, and the measured viscosity at 25°C measured according to JIS K7117-2 (cone-plate rotary viscometer) is 3000mPa·s) and diisononyl adipate as a monomeric ester plasticizer Esters ("DINA" manufactured by Jiei Plus Co., Ltd.) were stirred...

Embodiment 2

[0132] The mixing ratio of PVDF-I and PVDF-II was changed to 95% by weight and 5% by weight respectively to obtain PVDF mixture A (crystallization temperature Tc = 148.8° C.), and the supply ratio of mixture A / mixture B was 33.9% by weight / 66.1 % by weight, and the temperature Tq of the cooling water bath was changed to 12° C., and the pulling speed was changed to 3.3 m / min. In the same manner as in Example 1, the polyvinylidene fluoride system of the present invention was obtained. Hollow fiber porous membrane.

Embodiment 3

[0134] The mixing ratios of the adipate-based polyester-based plasticizer "D623N" and the diisononyl adipate "DINA" were changed to 80% by weight and 20% by weight respectively to obtain a plasticizer mixture B, and the temperature of the cooling water bath was adjusted to The polyvinylidene fluoride-based hollow fiber porous membrane of the present invention was obtained in the same manner as in Example 2, except that Tq was changed to 85° C. and the pulling speed was changed to 4.3 m / min.

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Abstract

Disclosed is a vinylidene fluoride resin porous film that has two primary surfaces which sandwich a prescribed thickness therebetween, having a dense layer which governs filtration performance on one surface side and having a sparse layer which provides strengthening support on the reverse surface side, and having an asymmetrical reticular inclined structure whereby the pore diameter continuously increases from the one surface toward the reverse surface, with the porosity (A1) (%) of a 7 [mu]m-thick portion of the dense layer that touches the one surface side being 50% or greater, and the surface pore diameter (P1) on one surface side being 0.30 [mu]m or less. This vinylidene fluoride resin porous film generally is useful as a porous film used for separation, and exhibits excellent ability to maintain permeability with respect to the continuous filtration of turbid water. This vinylidene fluoride resin porous film is manufactured with a method whereby a polyester plasticizer, which is compatible with a large molecular weight vinylidene fluoride resin and which in mixture with the vinylidene fluoride resin provides a crystallization temperature that is virtually identical to the crystallization temperature of vinylidene fluoride resin alone, is added in a relatively large amount to obtain a melt extrusion film that is preferentially cooled from one side and hardened, after which the plasticizer is extracted.

Description

technical field [0001] The present invention relates to a porous membrane made of vinylidene fluoride resin which is suitable as a porous membrane for separation and has particularly excellent (filtered) water treatment performance, and a method for producing the same. Background technique [0002] Since 1,1-vinylidene fluoride resins are excellent in weather resistance, chemical resistance, and heat resistance, their application to porous membranes for separation is being studied. In particular, many proposals have been made regarding (for example, patent documents 1 to 6) regarding porous vinylidene fluoride membranes for use in (filtrated) water treatment, especially tap water production or sewage treatment, as well as their production methods. ). [0003] In addition, the present inventors have also found that by melt-extruding a 1,1-vinylidene fluoride resin having specific molecular weight properties together with a plasticizer and a good solvent for the 1,1-vinyliden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08C02F1/44C08J9/26D01F6/48B29C48/08
CPCB01D67/002B01D69/08B01D2323/20B01D2325/34B29C48/08B29C48/914B29C48/919B01D71/34C08J9/26D01F6/48B01D2325/022B01D67/0027C02F1/444D01F1/10D01D5/24B01D2325/02834B01D2325/341
Inventor 多田靖浩高桥健夫
Owner KUREHA KAGAKU KOGYO KK
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