Vinylidene fluoride resin porous membrane, manufacturing method therefor, and method for manufacturing filtrate water

一种二氟乙烯、制造方法的技术，应用在多孔膜领域，能够解决持续性不足、膜强度或耐化学性降低等问题

Inactive Publication Date: 2012-05-23
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Of course, attempts have been made to reduce the filtration pressure caused by clogging by hydrophilizing the vinylidene fluoride resin itself or partially hydrophilizing the porous membrane of the vinylidene fluoride resin formed. However, most of them face problems such as insufficient sustainability of the effect, or a decrease in film strength or chemical resistance, and cannot solve the essential problem

Method used

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  • Vinylidene fluoride resin porous membrane, manufacturing method therefor, and method for manufacturing filtrate water
  • Vinylidene fluoride resin porous membrane, manufacturing method therefor, and method for manufacturing filtrate water
  • Vinylidene fluoride resin porous membrane, manufacturing method therefor, and method for manufacturing filtrate water

Examples

Experimental program
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Effect test

Embodiment 1

[0147] 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.).

[0148] 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...

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Abstract

Provided is a vinylidene fluoride porous membrane characterized in that in a continuous area of thickness 10 [mu]m from one surface, as measured by a focused ion beam / scanning electron microscope, the mean diameter of netlike resin fibers is at most 100 nm and the porosity (A1) is at least 60%; also, the surface pore diameter (P1) at the aforementioned surface is at most 0.3 [mu]m. In addition to having a small surface pore diameter suitable for water filtration, the provided porous membrane comprises extremely thin netlike resin fibers and has a treated-water-side surface layer with extremely high porosity, thereby excelling at preventing particulate penetration and also being extremely reusable and resistant to contamination. The provided porous membrane is manufactured through a method wherein a melt-extruded membrane is obtained by adding a comparatively large amount of a polyester plasticizer which is compatible with a high-molecular-weight vinylidene fluoride resin and which, when kneaded together with the vinylidene fluoride resin, causes the crystallization temperature to be nearly equal to that of the vinylidene fluoride resin alone. After the melt-extruded membrane is preferentially cooled from one side and solidified, the plasticizer is extracted, the surface is partially wetted, and the membrane is stretched.

Description

technical field [0001] The present invention relates to a porous membrane made of 1,1-vinylidene fluoride resin suitable as a porous membrane for separation, especially a (filtered) water treatment performance, pollution resistance, and reproducibility, a method for producing the porous membrane, and a method for using the porous membrane. A method of manufacturing a porous membrane for filtering water. 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] For example, Patent Documents 1 and 2 disclose methods for producing porous memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D65/02B01D65/06B01D69/08C02F1/44C08J9/26D01F6/48
CPCD01D5/24D01F1/10B01D71/34C02F3/1268B01D69/087B01D67/002B01D69/08C02F1/444D01F6/48B01D2325/02Y02W10/10B01D65/02B01D2325/02834
Inventor 多田靖浩高桥健夫
Owner KUREHA KAGAKU KOGYO KK
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