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Hollow fiber porous film and process for producing same

一种多孔膜、中空的技术，应用在化学仪器和方法、膜、膜技术等方向，能够解决很难微孔结构、中空纤维多孔膜综合性能下降等问题，达到工艺过程易于、工业化实施容易、强力高的效果

Inactive Publication Date: 2009-01-14
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in compatibility between water-soluble polymers such as polyoxyethylene and polyvinylidene fluoride (PVDF) and the viscosity difference at the temperature of melt spinning, it is difficult to form a uniform microporous structure in the actual preparation process. , resulting in a decline in the comprehensive performance of the PVDF hollow fiber porous membrane
Within the scope of the applicant's search, there is no technology identical to the following hollow fiber porous membrane melt spinning preparation method of the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Will account for the PVDF of 40% of multi-phase film-forming system gross weight, 30% water-soluble component PEO (molecular weight 100,000) and 30% organic compound liquid (the mixture of good solvent DMSO and water-soluble non-solvent Tween-80 , wherein DMSO accounts for 60% of the total weight of the organic compound liquid) blending, the resulting heterogeneous film-forming system is mixed uniformly through a twin-screw extruder or a reactor at 160 ° C and extruded through a hollow fiber spinning assembly, passing through 30mm The distance between the steam bath and the 30°C saturated steam bath enters the first cold water bath, and then enters the second water steam bath at a temperature of 30°C; the ratio of the wire guide speed to the wire feeding speed of the first bath is 2: 1, and then fully extracting and washing in water for 2.5 hours under a fixed-length tension state, the hollow membrane was prepared.

[0035] At 0.1Mpa and 25°C, the water flux of the obta...

Embodiment 2

[0037] In the method of Example 1, the medium of the second bath was changed to a glycerin bath and a silicone oil bath respectively, and other conditions remained unchanged, the water fluxes of the obtained hollow membrane at 0.1Mpa and 25°C were 3260 and .980 respectively. (L·m -2 h -1 ).

[0038] In this embodiment, when the medium of the second bath is a silicone oil bath, if the obtained hollow membrane is washed with 98% by weight ethanol aqueous solution before water extraction and washing, after removing the hydrophobic silicone oil, it is then subjected to water extraction and washing , other conditions remain unchanged, at 0.1Mpa and 25°C, the measured water flux of the obtained hollow membrane increases to 3250 (L m -2 h -1 ).

Embodiment 3

[0040] In the method of Example 1, the 30-mm 30° C. saturated steam bath was replaced by a 30° C. air bath, and other conditions remained unchanged, to obtain the hollow membrane.

[0041] At 0.1Mpah and 25°C, the water flux of the obtained hollow membrane was determined to be 2890 (L m -2 h -1 ).

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PUM

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Abstract

The invention relates to a hollow fiber porous film and a preparation method. A weight percentage formulation of a polyphase film-forming system of the film is that: a polymer base phase is in 40 to 60 percent; an organic compound fluid is in 20 to 30 percent; and a water-soluble substance is in 20 to 40 percent; wherein the polymer base phase is a mixture which can be dissolved by an organic solvent and melted; the organic compound fluid is the mixture of a good solvent in 60-90 percent and a non-solvent material in 40 to 10 percent in total weight; the water-soluble substance is a water-soluble polymer, or a low-molecular water-soluble particle, or the mixture of the water-soluble polymer and the low-molecular water-soluble particle in an arbitrary mixing ratio. The preparation method comprises the following steps: 1. the organic compound fluid is prepared; 2. the polyphase film-forming system is mixed evenly; 3. a spinning is melted; 4. stretching and scrubbing washing of extract are carried out so as to obtain the hollow fiber porous film.

Description

technical field [0001] The present invention relates to the preparation technology of hollow fiber porous membrane, specifically a hollow fiber porous membrane with high strength and large flux and the preparation method of melt spinning thereof. The international patent classification number is intended to be Int.Cl..D01F6 / 00 ( 2006.01) I. Background technique [0002] There have been many reports in the literature on the method of preparing hollow fiber porous membranes by melt spinning. These include a class of technologies related to the preparation of hollow fiber porous membranes using PP, PE and other hard elastic polymer materials. Melt directly, and get hollow fibers through hollow fiber spinning components. After the structure is stabilized, after post-stretching, the crystal region and the amorphous region undergo microphase separation, thereby forming a microporous structure, but the hollow fiber obtained by this method is porous. The porosity of the membrane i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34B01D71/30
CPCB01D2323/08B01D69/08B01D71/30B01D2323/12B01D71/34B01D69/087B01D67/002B01D71/54B01D71/301B01D2323/081
Inventor 肖长发胡晓宇梁海先安树林
Owner TIANJIN POLYTECHNIC UNIV
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