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Method for preparing hydrophilic polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride, fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of low membrane surface energy, hinder the popularization and application of polyvinylidene fluoride membrane, etc. Simple, easy-to-control reaction conditions

Inactive Publication Date: 2013-09-04
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low surface energy of the film made of polyvinylidene fluoride, it presents strong hydrophobicity and is prone to adsorption pollution, which hinders the further popularization and application of polyvinylidene fluoride film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Polyvinylidene fluoride resin at a concentration of 15 wt%, polyethylene glycol at a concentration of 5 wt%, polyethylene polyamine at a concentration of 15 wt%, and N,N-dimethylacetamide at a concentration of 65 wt% were added in sequence In the reaction kettle, the above solution was stirred and dissolved at 60° C., and the casting solution was obtained after stirring and reacting for 24 hours. The obtained casting liquid is extruded through the spinneret of the hollow fiber spinning machine and the core liquid in the central tube hole of the spinneret at the same time, passes through the coagulation liquid with a temperature of 30°C, and then enters the coagulation liquid, where phase separation and solidification occur. hollow fiber membrane

[0016] (2) Immerse the hollow fiber membrane prepared above into a 3 wt% potassium permanganate solution, take it out after 30 minutes, and remove the residual potassium permanganate on the surface with deionized water.

...

Embodiment 2

[0021] (1) Polyvinylidene fluoride resin at a concentration of 18 wt%, polyvinylpyrrolidone at a concentration of 5 wt%, lithium chloride at a concentration of 1 wt%, ethylenediamine at a concentration of 10 wt%, and N,N- Add dimethylformamide into the reaction kettle one by one, stir and dissolve the above solution at 70° C., stir and react for 24 hours to obtain a casting solution. The obtained casting liquid is extruded through the spinneret of the hollow fiber spinning machine and the core liquid in the central tube hole of the spinneret at the same time, passes through the coagulation liquid with a temperature of 45°C, and then enters the coagulation liquid, where phase separation and solidification occur. hollow fiber membrane

[0022] (2) Immerse the hollow fiber membrane prepared above into a 3wt% potassium permanganate solution, take it out after 30 minutes, and remove the residual potassium permanganate on the surface with deionized water.

[0023] (3) Immerse the a...

Embodiment 3

[0027] (1) Polyvinylidene fluoride resin at a concentration of 25 wt%, polyethylene glycol at a concentration of 4 wt%, lithium chloride at a concentration of 1 wt%, ethylenediamine at a concentration of 6 wt%, and N,N at a concentration of 64 wt%. - adding dimethylformamide into the reaction kettle in turn, stirring and dissolving the above solution at 50° C., stirring and reacting for 24 hours to obtain a casting solution. The obtained casting liquid is extruded through the spinneret of the hollow fiber spinning machine and the core liquid in the central tube hole of the spinneret at the same time, passes through the coagulation liquid with a temperature of 40°C, and then enters the coagulation liquid, where phase separation and solidification occur. hollow fiber membrane

[0028] (2) Immerse the hollow fiber membrane prepared above into a 3wt% potassium permanganate solution, take it out after 30 minutes, and remove the residual potassium permanganate on the surface with de...

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Abstract

The invention discloses a method for preparing a hydrophilic polyvinylidene fluoride hollow fiber membrane, which comprises the following steps: (1) sequentially adding polyvinylidene fluoride resin with concentration of 12 to 30 weight percent, a pore-forming agent with concentration of 2 to 10 weight percent, organic alkali with concentration of 2 to 30 weight percent and a solvent with concentration of 50 to 80 weight percent into a reaction kettle, stirring to perform reaction to obtain film casting liquid and extruding the film casting liquid by a hollow fiber spinning machine to prepare a hollow fiber membrane; 2, soaking the prepared hollow fiber membrane into 3 weight percent of potassium permanganate solution; and 3, soaking the hollow fiber membrane processed by the potassium permanganate solution into 5 weight percent of sodium hydrogen sulfite solution to obtain the hydrophilic polyvinylidene fluoride hollow fiber membrane. The preparation method disclosed by the invention adopts a manner of adding the organic alkali into the film casting liquid to perform hydrophilic modification on a polyvinylidene fluoride film; the preparation method is simple to operate; and reaction conditions in each step are easy to control.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride hollow fiber membrane, in particular to a preparation method of a hydrophilic polyvinylidene fluoride hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride is a polymer material with excellent performance. Due to its good chemical stability, thermal stability and mechanical strength, it is widely used as a membrane material in the fields of ultrafiltration, microfiltration, membrane distillation, and gas separation membrane process. . However, due to the low surface energy of the film made of polyvinylidene fluoride, it exhibits strong hydrophobicity and is prone to adsorption pollution, which hinders the further popularization and application of polyvinylidene fluoride film. In recent years, researchers have been committed to introducing various hydrophilic groups into the main chain of polyvinylidene fluoride or the surface of the film through modificat...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 华河林李娜刘贤辉符才杰
Owner NANCHANG HANGKONG UNIVERSITY
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