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Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same

A fiber, hollow technology, applied in hollow filament manufacturing, chemical instruments and methods, single-component synthetic polymer rayon, etc., can solve the problems of membrane performance degradation, difficulty in obtaining separation ability and permeation ability, etc.

Inactive Publication Date: 2012-12-12
IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, commercially available polymeric materials for gas separation with membrane properties (in the case of air separation, oxygen permeability of 1 Barrer or higher and oxygen / nitrogen selectivity of 6.0 or higher ) is limited to a few types
This is because: there are considerable limitations in improving polymer structures, and the greater compatibility between permeability and selectivity makes it difficult to obtain separation and permeability beyond predetermined upper bounds
[0014] Furthermore, conventional polymeric membrane materials have limitations and disadvantages in permeation and separation properties because they undergo decomposition and aging after long-term exposure to high-pressure and high-temperature processes or after exposure to gas mixtures containing hydrocarbons, aromatics, and polar solvents, thus causing a considerable decrease in the inherent membrane performance

Method used

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  • Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same
  • Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same
  • Hollow fiber, dope solution composition for forming a hollow fiber, and method for manufacturing a hollow fiber using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0412] Hollow fibers including polybenzoxazole represented by Chemical Formula 51 are prepared by the following reaction scheme 3 using a doping solution composition containing polyhydroxyamic acid for forming hollow fibers.

[0413] [Reaction Scheme 3]

[0414]

[0415] (1) Preparation of polyhydroxyamic acid

[0416] Add 36.6g (0.1mol) of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane and 44.4g (0.1mol) of 4,4'-(hexafluoroisopropene) diphthalic anhydride Into 189 g (70 wt%) of N-methylpyrrolidone (NMP) and then reacted at 15°C for 4 hours to obtain a pale yellow viscous polyamic acid.

[0417] (2) Preparation of doping solution composition for forming hollow fibers

[0418] The obtained polyamic acid was added to 5 wt% of tetrahydrofuran as an additive without removing the solvent to prepare a uniform doping solution composition for forming hollow fibers.

[0419] (3) Preparation of hollow fiber

[0420] The doping solution composition for forming hollow fibers was defoamed under re...

Embodiment 2

[0424] The hollow fiber including the polybenzothiazole represented by Chemical Formula 52 is prepared by the following reaction using a doping solution composition containing polythioamic acid for forming hollow fibers.

[0425] [Chemical formula 52]

[0426]

[0427] The hollow fiber including the polybenzothiazole represented by the above Chemical Formula 52 was prepared in the same manner as in Example 1, except for the starting material, 20.8 g (0.1 mol) of 2,5-diamino-1,4- Dithiophene dihydrochloride and 44.4 g (0.1 mol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride were reacted to prepare a polyamic acid containing a thiol group (-SH).

[0428] The hollow fiber thus prepared has a weight average molecular weight of 14,500. As a result of FT-IR analysis, polybenzothiazole is at 1484cm -1 (C-S) and 1404cm -1 The characteristic frequency band of (C-S) was not detected in polyimide. The hollow fiber has a fractional free volume of 0.26 and interplanar spacing (d-spacing)...

Embodiment 3

[0431] The hollow fiber including the polypyrrolidone represented by Chemical Formula 53 is prepared by the following reaction using a doping solution composition containing polyaminoamic acid for forming hollow fibers.

[0432] [Chemical formula 53]

[0433]

[0434] The hollow fiber including the polypyridine represented by the above Chemical Formula 53 was prepared in the same manner as in Example 1, except for the starting materials, 21.4 g (0.1 mol) of 3,3′-diaminobenzidine and 44.4 g (0.1mol) of 4,4'-(hexafluoroisopropylene) diphthalic anhydride is reacted to prepare an amine group (-NH 2 ) Of polyamic acid.

[0435] The hollow fiber thus prepared has a weight average molecular weight of 18,000. As a result of FT-IR analysis, the polypyridine is at 1758cm -1 (C=O) and 1625cm -1 The characteristic band of (C=N) was not detected in polyimide. The hollow fiber has a fractional free volume of 0.28 and interplanar distance (d-spacing) of 630 pm.

[0436] The interplanar spacing (d-...

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Abstract

Disclosed is a hollow fiber that includes a hollow positioned at the center of the hollow fiber, macropores positioned at adjacent to the hollow, and mesopores and picopores positioned at adjacent to macropores, and the picopores are three dimensionally connected to each other to form a three dimensional network structure. The hollow fiber includes a polymer derived from polyamic acid, and the polyamic acid includes a repeating unit obtained from aromatic diamine including at least one ortho -positioned functional group with respect to an amine group and dianhydride.

Description

Technical field [0001] The present disclosure relates to hollow fibers, a doping solution composition for forming hollow fibers, and a method for preparing hollow fibers using the doping solution composition. Background technique [0002] Membranes must meet the requirements of excellent thermal stability, chemical stability and mechanical stability, high permeability, and high selectivity so that they can be commercialized and then applied to various industries. The term "permeability" as used herein is defined as the rate at which a substance penetrates through a membrane. The term "selectivity" as used herein is defined as the permeability ratio between two different gas components. [0003] Based on separation performance, membranes can be divided into reverse osmosis membranes, ultrafiltration membranes, microfiltration membranes, gas separation membranes, and so on. Based on the shape, membranes can be roughly divided into flat sheet membranes, roll membranes, composite mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/24D01D5/247D01F6/80C08L79/08C08K5/42C08K5/05C08K5/15
CPCB01D2257/11Y02C20/20D01D5/24B01D67/00C08G75/32D01F1/08C08G73/22C08L79/08B01D2257/7025B01D71/64B01D53/00B01D69/08C08G73/18C08J7/08B01D53/22B01D69/087D01F6/74C08G73/10B01D2257/102B01D53/228C08G73/1042B01D2325/02Y02C10/10B01D2257/504B01D2257/104C08J2379/08B01D2325/025D01D5/247B01D2257/108Y02P20/156Y02C20/40Y02P20/151Y02P70/62B01D2325/0283
Inventor 郑哲豪韩尚勳李永茂朴浩范
Owner IUCF HYU (IND UNIV COOP FOUND HANYANG UNIV)
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