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Method for preparing nanofiber-based composite filter membrane by hot-pressing incipient fusion method

A technology of nanofibers and composite membranes, which is applied in the field of preparation of separation composite membranes. It can solve the problems of difficult control of steam vertical melting conditions, long film making time, and difficulty in controlling the thickness of functional skin layers. The preparation method is simple and easy to implement, and it is easy to expand the effect of production

Active Publication Date: 2015-02-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high porosity and interconnected open-pore structure of the nanofiber porous base membrane, the following two problems are prone to occur in the process of preparing the composite membrane: one is that the casting solution is prone to appear during the coating process. The phenomenon of infiltration; the second is the difficulty in controlling the thickness of the functional cortex
However, it takes a long time for the film to be formed by the solution dipping method, and the steam dipping condition is difficult to control; and the composite membrane surface layer prepared by these methods is loose, and can only be used to retain larger substances (such as emulsions), so it is not suitable for industrial production. We are at a disadvantage, and there are limitations in its promotion and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) 24 g of polyethersulfone (PES) was dissolved in 76 g of N,N-dimethylformacetamide (DMAc) solvent to obtain a transparent and uniform electrospinning solution;

[0026] (2) 1.0 g of chitosan (CS) was dissolved in 99 g of deionized water, and magnetically stirred in a water bath at 50° C. to obtain a transparent and uniform electrostatic spray solution;

[0027] (3) Add the electrospinning stock solution in (1) into the syringe, and extrude under the control of a micro-injection pump. The nozzle is connected to a high-voltage positive electrode. The electrospinning parameters are controlled at a voltage of 20kv, the nozzle aperture is 0.7mm, and the solution flow rate is 30μl / min. The ambient temperature is 35°C, the relative air humidity is 35%, and electrospinning is performed. The average diameter of the obtained PES electrospun nanofibers is 600nm, the deposition thickness is 400μm, and the porosity is 78%;

[0028](4) Add the electrostatic spray stock solution in...

Embodiment 2

[0033] (1) 10 g of polyacrylonitrile (PAN) was dissolved in 90 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform electrospinning solution;

[0034] (2) Dissolve 4.0 g of polyvinyl alcohol (PVA) in 96 g of deionized water, and perform magnetic stirring in a water bath at 90° C. to obtain a transparent and uniform electrostatic spray solution;

[0035] (3) Add the electrospinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump. The temperature is 55°C, the relative air humidity is 35%, and electrospinning is carried out. The average diameter of the obtained PAN electrospun nanofibers is 500nm, the deposition thickness is 800μm, and the porosity is 86%;

[0036] (4) Add the electrostatic spray stock solution in (2) into the container, and extrude under the control of a micro-injection pump, the nozzle is connected to a high-voltage positive electrode, the electrospinning parameters are controlled at a vo...

Embodiment 3

[0041] (l) Dissolve 25 g of polysulfone (PSU) in 75 g of a mixed solvent (7:3) of N,N-dimethylacetamide (DMAc) and N-methylpyrrolidone (NMP), and stir magnetically at 60°C Obtain a transparent and uniform spinning dope;

[0042] (2) Dissolving 8.0 g of cellulose diacetate (CDA) in 92 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform electrostatic spray solution;

[0043] (3) Add the spinning stock solution in (1) into the container, extrude under the control of a micro-injection pump, connect the nozzle to the high-voltage positive electrode, control the electrospinning parameters at a voltage of 28kv, the nozzle aperture is 0.5mm, the solution flow rate is 18μl / min, and the ambient temperature 45 ℃, air relative humidity 25%, carry out electrospinning, the average diameter of the obtained PSU electrospun nanofiber is 500nm, deposition thickness is 400μm, porosity is 83%;

[0044] (4) Add the electrostatic spray stock solution in (2) into the contai...

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Abstract

The invention relates to a method for preparing a nanofiber-based composite filter membrane by a hot-pressing incipient fusion method. The method comprises the following steps: preparing a spinning solution from functional macromolecules to carry out electrostatic spinning and using an obtained nanofiber non-woven fabric as a supporting layer of the composite filter membrane; preparing a solution from another functional macromolecules and spraying the solution to the surface of a base membrane of the non-woven fabric by an electrostatic spraying method to form a barrier layer of the composite membrane; carrying out processing on the barrier layer of the composite membrane by adopting the hot-pressing incipient fusion method which gives suitable temperature, pressure and hot-pressing time so as to obtain the complete barrier layer; finally, carrying out post processing on the barrier layer to obtain the required nanofiber-based separation composite membrane. The method for preparing the composite filter membrane, which is provided by the invention and is simple and easy to operate, can conveniently and accurately control the thickness and uniformity of the functional barrier layer and is easy to implement scale production; the obtained nanofiber-base composite membrane has a wide prospect in the fields of ultrafiltration, nanofiltration, reverse osmosis and the like.

Description

technical field [0001] The invention belongs to the field of preparation of separation composite membranes, and in particular relates to a method for preparing nanofiber-based composite filter membranes by hot-pressing vertical melting method. Background technique [0002] The shortage of water resources and the deterioration of the water environment are common problems in the world today. As a new type of high separation, concentration, purification and purification technology, membrane separation technology has high selectivity, simple operation, low energy consumption, small footprint, It has been widely used in seawater desalination, industrial wastewater treatment, environmental pollution control and other fields [Xu Youyi, Xu Zhikang, Polymer Membrane Materials, Chemical Industry Press, 2005; S.Judd, B.Jefferson, Membrane Technology and Industrial Wastewater Reuse, Chemical Industry Press, 2006] is the guarantee to solve the serious water shortage crisis, sewage discha...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/12B01D67/00
Inventor 王雪芬神领弟杨寅于旭峰程诚
Owner DONGHUA UNIV
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