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Porous membrane made of polytetrafluoroethylene hollow fibers, preparation method and application thereof in membrane contactor

A polytetrafluoroethylene and porous membrane technology, which is applied in membrane technology, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of insoluble particle agglomeration or uneven dispersion, and achieve good spinnability and spinning solution Uniform, no agglomeration or caking effect

Inactive Publication Date: 2014-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of agglomeration or uneven dispersion caused by insoluble particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 100g of PVA1788 in 400g of water, add 1660g of PTFE emulsion (60wt%) after completely dissolving, stir well, then add 10g of γ-aminopropyl triethoxysilane, 100g of ethyl orthosilicate in turn, at room temperature Under mechanical stirring for about 4 hours, after vacuum defoaming, wet spinning. The obtained as-spun fibers are subjected to processes such as natural drying, sintering and stretching, and then extracted and washed in 5% sodium hydroxide aqueous solution for 48 hours to obtain a PTFE hollow fiber porous membrane. Sintering conditions: 380°C, 5min, stretching temperature: 300°C, stretching ratio: 1.5 times. The porosity of the obtained membrane filament is 30%, the average pore diameter is 0.2 μm, and the contact angle is 105°. Processing PTFE hollow fiber porous membrane filaments into membrane contactor components, with 15% CO 2 / N 2 The mixed gas is the raw material gas, the aqueous solution of diethanolamine with a mass fraction of 30% is used...

Embodiment 2

[0028] Dissolve 100g of PVA2488 in 400g of water, add 1660g of PTFE emulsion (60wt%) after completely dissolving, stir evenly, then add 20g of γ-aminopropyltriethoxysilane as silane coupling agent, 200g of ethyl orthosilicate, at room temperature Mechanical stirring for about 8 hours, vacuum defoaming, wet spinning. The obtained as-spun fibers are subjected to processes such as natural drying, sintering and stretching, and then extracted and washed in 20% sodium hydroxide aqueous solution for 48 hours to obtain a PTFE hollow fiber porous membrane. Sintering conditions: 380°C, 5min, stretching temperature: 300°C, stretching ratio: 1.5 times, the porosity of the obtained membrane filament is 42%, the average pore diameter is 0.7μm, and the contact angle is 115°. Processing PTFE hollow fiber porous membrane filaments into membrane contactor components, with 15% CO 2 / N 2 The mixed gas is the raw material gas, the aqueous solution of diethanolamine with a mass fraction of 30% is...

Embodiment 3

[0030]Dissolve 100g of PVA1799 in 400g of water, add 1660g of PTFE emulsion (60wt%) after completely dissolving, stir evenly, then add 10g of γ-glycidoxypropyltrimethoxysilane, 100g of methyl orthosilicate in sequence, Stir mechanically at room temperature for about 8 hours. After vacuum defoaming, wet spinning. The obtained as-spun fibers are subjected to processes such as natural drying, sintering and stretching, and then extracted and washed in 20% sodium hydroxide aqueous solution for 48 hours to obtain a PTFE hollow fiber porous membrane. Sintering conditions: 360°C, 8min, stretching temperature: 300°C, stretching ratio: 2 times, the porosity of the obtained membrane filament is 48%, the average pore diameter is 1.0 μm, and the contact angle is 108°. Processing PTFE hollow fiber porous membrane filaments into membrane contactor components, with 15% CO 2 / N 2 The mixed gas is the raw material gas, the aqueous solution of diethanolamine with a mass fraction of 30% is used...

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PUM

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Abstract

The invention relates to a porous membrane made of polytetrafluoroethylene hollow fibers, a preparation method and an application thereof in membrane contractor. A silica precursor carries out in-situ reactions in a polytetrafluoroethylene spinning solution to generate silica nano particles, and then a silane coupling agent is added into the solution to evenly disperse the silica nano particles so as to obtain the pore-forming agent used in the film-forming process of hollow fiber membrane. The wires for spinning membranes are subjected to a series of treatments such as proper drying, sintering, stretching, extracting, and washing so as to obtain hydrophobic polytetrafluoroethylene hollow membranes with a certain micro-porous structure. The porous membrane made of polytetrafluoroethylene hollow fibers has a very good application prospect in the field of membrane contactor.

Description

technical field [0001] The invention relates to a preparation method of a polytetrafluoroethylene hollow fiber porous membrane and its application in a membrane contactor. Background technique [0002] Polytetrafluoroethylene (PTFE) material has outstanding chemical stability, excellent high and low temperature resistance and good corrosion resistance, so filter materials made of PTFE can be widely used in the separation of fine particles under harsh conditions. At the same time, due to its strong hydrophobicity, PTFE has also become an ideal membrane material for the preparation of waterproof and breathable, membrane distillation, osmotic distillation and membrane contactor processes. However, PTFE is insoluble in general solvents, has high viscosity and poor fluidity at high temperatures, and its "insoluble and infusible" characteristics make its processing performance poor, and it cannot be wet-spun like polysulfone, polypropylene and polyvinylidene fluoride. Or melt spi...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/08B01D67/00B01D61/00B01D53/22C02F1/44C10L3/10
Inventor 曹义鸣贾静璇康国栋孙承贵吴鸣李萌刘丹丹程毅丽
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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