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Preparation method of pore size-adjustable high-flux nanofiber composite ultra-filtration membrane

A nanofiber membrane and nanofiber technology, applied in the field of ultrafiltration membranes, can solve the problems of poor mechanical properties of membranes, intolerance to shear force, etc., and achieve the effects of high membrane stability, long service life, and improved mechanical properties.

Inactive Publication Date: 2016-10-12
上海洁晟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanofiber membranes also have some problems in industrial production and practical industrial applications. For example, the filter layer of nanofiber membranes is composed of nanofibers, which are relatively loose, resulting in poor mechanical properties of the membrane and resistance to shear force.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 10g polyacrylonitrile (PAN) and dissolve it in 90g N, N-dimethylformamide (DMF) to obtain a uniform and transparent high molecular polymer spinning dope, add it to the nozzle to polymerize The ester non-woven fabric is the support layer for electrospinning. The basic parameters of electrospinning are: voltage 15kV, nozzle aperture 0.5mm, spinning dope flow rate 0.002mm / s, distance from spinneret to receiving drum is 20cm, spinning The temperature of the silk environment is 35°C, and the relative humidity of the surrounding environment is 20%, and the electrospun polymer nanofiber membrane-PAN nanofiber membrane, which is composited by the polymer nanofiber membrane layer and the non-woven fabric layer, is obtained.

[0022] (2) Stir 19.9g of 0.02mol / L calcium chloride solution and 0.1g of PAA solution with molecular weight of 3000 to obtain a mixed solution with a content of 0.5% PAA, and use the PAN nanofiber membrane prepared in step (1) to make The obtained 0....

Embodiment 2

[0029] (1) Weigh 10g polyurethane (PU) and dissolve it in 90g N, N-dimethylformamide (DMF) to obtain a uniform and transparent high-molecular polymer spinning dope, and add it to the nozzle. The woven fabric is the support layer for electrospinning. The basic parameters of electrospinning are: voltage 15kV, nozzle aperture 0.5mm, spinning dope flow rate 0.002mm / s, distance from spinneret to receiving drum is 20cm, spinning environment The temperature is 35°C, the relative humidity of the surrounding environment is 20%, and the electrospun polymer nanofiber membrane-PU nanofiber membrane, which is composited by the polymer nanofiber membrane layer and the non-woven fabric layer, is obtained.

[0030] (2) Stir 19.8g 0.01mol / L magnesium chloride solution and 0.2g PAA solution with molecular weight of 2000 to obtain a 1% PAA mixed solution. Use the PU nanofiber membrane prepared in step (1) with the prepared 1 The %PAA mixture is fully infiltrated.

[0031] (3) Soak 10.0g of bamboo pu...

Embodiment 3

[0036] (1) Weigh 10g of polystyrene (PS) and dissolve it in 90g of N, N-dimethylformamide (DMF) to obtain a homogeneous and transparent high molecular polymer spinning dope, add it to the nozzle to polymerize The ester non-woven fabric is the support layer for electrospinning. The basic parameters of electrospinning are: voltage 15kV, nozzle aperture 0.5mm, spinning dope flow rate 0.002mm / s, distance from spinneret to receiving drum is 20cm, spinning The temperature of the silk environment is 35°C, and the relative humidity of the surrounding environment is 20%, and the electrospun polymer nanofiber membrane-PS nanofiber membrane, which is composited by the high molecular polymer nanofiber membrane layer and the non-woven fabric layer, is obtained.

[0037] (2) Mix 19.85g of 0.02mol / L magnesium sulfate solution and 0.15g of PAA solution with molecular weight of 1000 to obtain a 0.75% PAA mixed solution, and use the PS nanofiber membrane prepared in step (1) to prepare The 0.75% P...

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Abstract

The invention is a method for preparing a high-throughput nanofiber composite ultrafiltration membrane with adjustable pore size, which is characterized in that: the ultrafiltration membrane uses non-woven fabric as a support layer and a polymer nanofiber layer as a base layer 1. The pore size can be adjusted and the high flux nanofiber composite ultrafiltration membrane is composed of natural cellulose nanofibers as a gel layer. The present invention combines electrospinning technology and uniform glue coating method, adopts thermally cross-linked polyacrylic acid / polyvinyl alcohol to increase the strength of the film, and adjusts the coating amount and baking conditions of cellulose nanofibers, which can be adjusted according to actual application needs Nanofiber composite ultrafiltration membranes with different pore sizes were prepared. It has been determined that the pore size of the ultrafiltration membrane prepared by the method of the present invention can be adjusted to 5-100 nm, and the pure water permeation flux of the corresponding membrane is 80-2000 L / h m under the working pressure of 0.2 MPa. 2 .

Description

Technical field [0001] The invention relates to an ultrafiltration membrane, in particular to a preparation method of a nanofiber composite ultrafiltration membrane with adjustable pore size and high flux, which is applied to the production of separation, concentration, and purification of biological products in industries such as pharmaceutical products, food, and fermentation. In the process. Background technique [0002] Cellulose nanofibers (CNF) are currently the focus of material science, and the development of new materials "cellulose nanofibers" using plants as raw materials has made remarkable progress. Chinese patent CN 102675475 reported that hemp fiber was first treated with alkali, and then TEMPO was used to catalyze the oxidation to obtain a hemp fiber nano-cellulose crystal suspension. The CNF diameter was only 3-10nm. However, by adjusting the entanglement between CNF fibers, extremely high strength is achieved. Moreover, the raw materials of cellulose nanofiber...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D69/12B01D67/00D04H1/728D04H1/435D04H1/43D04H1/4358D04H1/4291D01D5/00
CPCB01D61/145B01D69/12B01D69/125B01D2323/28B01D2323/39B01D2323/46B01D2325/02D01D5/003D01D5/0069D01D5/0076D01D5/0092D04H1/4291D04H1/43D04H1/435D04H1/4358D04H1/728
Inventor 张秀芳方渡飞
Owner 上海洁晟环保科技有限公司
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