Preparation method of asymmetric porous membrane based on electrostatic spinning technology

An electrospinning technology, an electrospinning technology, applied in the field of membrane materials, can solve the problems of long crosslinking time and difficult control of membrane pore size, and achieve the effect of wide application range, wide application range and simple process

Inactive Publication Date: 2016-05-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent (CN1O4213333A) discloses a method of crosslinking electrospun fiber membranes by hot pressing to be used

Method used

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  • Preparation method of asymmetric porous membrane based on electrostatic spinning technology
  • Preparation method of asymmetric porous membrane based on electrostatic spinning technology
  • Preparation method of asymmetric porous membrane based on electrostatic spinning technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh a certain mass of cellulose acetate (CA, molecular weight 30000) and dissolve it in a mixed solvent of acetone / N, N-dimethylacetamide (DMAc) (2 / 1 (v / v)), magnetically stir After 12 hours, a CA spinning solution with a mass fraction of 21% was obtained, and the prepared CA spinning solution was added to a spinning syringe, received by a commonly used polyester (PET) non-woven fabric, and subjected to high-voltage electrospinning to obtain a double-layer fiber Membrane, electrospinning parameters are: voltage 16kV, temperature 20°C, relative humidity 45%, spinning solution propulsion speed 0.001mm / s, spinning needle inner diameter 0.5mm, receiving distance 20cm;

[0035] (2) Mix acetone / deionized water / dioctyl phthalate (DOP) with a volume ratio of 1 / 3 / 1 evenly to prepare a cross-linking liquid, and add it to a special container (self-made);

[0036] (3) Cover the container filled with the cross-linking solution with a double-layer fiber membrane spun, the elect...

Embodiment 2

[0039] Adjust the volume ratio of acetone / deionized water / dioctyl phthalate in Step 2) of Example 1 to 2 / 3 / 1, and the rest are the same as in Example 1 to obtain a CA porous membrane. The surface morphology of the CA porous membrane is as follows image 3 As shown, the third picture is a cross-sectional view of the non-woven fabric with the functional layer removed. From the figure, it can be clearly seen that the functional layer is connected and has a gradient-distributed pore structure. The average pore size of the CA porous membrane is 0.61um, and the pure water flux is 2111L.m -2 .h -1 , The rejection rate is 99.75%.

Embodiment 3

[0041] Adjust the volume ratio of acetone / deionized water / dioctyl phthalate in Step 2) of Example 1 to 3 / 2 / 1, and the rest are the same as in Example 1 to obtain a CA porous membrane. The surface morphology of the porous membrane is as Figure 4 As shown, the average pore size is 0.32um, and the pure water flux is 329L.m -2 .h -1 , The rejection rate is 99.93%.

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Abstract

The invention provides a preparation method of an asymmetric porous membrane based on electrostatic spinning technology. The preparation method comprises the following steps of: (1) dissolving one or more polymers in a corresponding solvent to obtain a spinning solution of certain concentration; (2) carrying out electrostatic spinning with the spinning solution and receiving with common non-woven fabric to prepare a double-layer fiber membrane; (3) preparing a crosslinking solution with a certain ratio from one or more solvents, and placing in a specific container; and (4) covering the specific container with the double-layer fiber membrane, sealing the whole device with the membrane material while ensuring that the electrospun nano fiber layer faces the crosslinking solution, and carrying out fumigation crosslinking at 10-250 DEG C for 0-5h to obtain the asymmetric porous membrane. According to the preparation method, the nano fiber layer undergoes gradient crosslinking to obtain the porous membrane with asymmetric functional layers; and the average pore diameter of the porous membrane is easily adjustable in the range of 20-3000nm. The preparation method is simple in preparation process and low in equipment requirement; and the prepared porous membrane has high flux and good retention performance, and can be applied to the fields of membrane separation, tissue engineering, cell culture, wound dressings, cell diaphragms and the like.

Description

technical field [0001] The invention relates to the field of membrane materials, in particular to a method for preparing an asymmetric porous membrane based on electrospinning technology. Background technique [0002] Polymer porous membranes have been widely used in the fields of environment, chemical industry, food, medicine and health, and biotechnology due to their characteristics of many varieties, low cost, easy processing, and excellent performance. They can be used as separation membranes, battery diaphragms, catalysts or drug carriers, Wound dressings can also be used as biological scaffolds, cultured cells, etc. According to the structure, polymer porous membranes can be divided into symmetrical membranes and asymmetric membranes, among which asymmetric membranes are widely used due to their advantages of high flux and high rejection. The traditional methods for preparing asymmetric polymer porous membranes are mainly phase inversion method or multilayer composite...

Claims

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Application Information

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IPC IPC(8): B01D71/74B01D71/46B01D71/16B01D71/68B01D71/06B01D71/38B01D71/54B01D71/28B01D71/40B01D71/56B01D71/50B01D71/42B01D71/26B01D71/48B01D67/00
CPCB01D67/0002B01D71/06B01D71/16B01D71/26B01D71/28B01D71/38B01D71/40B01D71/42B01D71/46B01D71/48B01D71/50B01D71/54B01D71/56B01D71/68B01D71/74B01D2325/022
Inventor 李先锋刘春玲王道辉张宇峰冯献社肖长发
Owner TIANJIN POLYTECHNIC UNIV
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