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Method for preparing porous membrane based on segmented copolymer fibre micel

A technology of block copolymer and viscose, which is applied in the field of composite porous membrane preparation, can solve the problems of complicated membrane preparation process, reduced membrane flux, decreased controllability, etc. The effect of mass loss

Active Publication Date: 2013-05-29
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These pretreatment processes not only make the membrane production process complicated and cumbersome, but also lead to problems such as increased cost, decreased controllability, and reduced membrane flux.

Method used

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  • Method for preparing porous membrane based on segmented copolymer fibre micel
  • Method for preparing porous membrane based on segmented copolymer fibre micel
  • Method for preparing porous membrane based on segmented copolymer fibre micel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a) Weigh 0.02 g of polystyrene and poly(4-vinylpyridine) block copolymer fiber micelles (poly(4-vinylpyridine) accounts for 13% of the total volume of the block copolymer), fiber The micelles have a diameter of 27nm and a length of 2-4 microns, dispersed in 500 grams of ethanol, and prepared into a solution with a polymer mass fraction of 0.004%;

[0028] b) Take a piece of polyethersulfone (PES) membrane (the membrane area is about 4.1 square centimeters), soak it in water for 5 minutes, take it out, and then put it in the filter;

[0029] c) Take 1.5g, 2g, 3g, 4.5g, 6g of the prepared block copolymer fiber micelle solution, and filter it under a vacuum of 5kPa to evenly cover the surface of the PES membrane, that is, the embedded membrane covered on the base membrane. The amount of segment copolymer fiber micelles is 14.6 micrograms / square centimeter, 19.5 micrograms / square centimeter, 29.3 micrograms / square centimeter, 43.9 micrograms / square centimeter, and 58.5 micr...

Embodiment 2

[0036] a) Weigh 0.02 g of polystyrene and poly(4-vinylpyridine) block copolymer fiber micelles (poly(4-vinylpyridine) accounts for 9% of the total volume of the block copolymer), fiber The micelles have a diameter of 37nm and a length of 1-3 microns, dispersed in 100 grams of ethanol, and prepared into a solution with a polymer mass fraction of 0.02%;

[0037] b) Take a piece of nylon membrane (the membrane area is about 4.1 square centimeters), soak it in water for 3 minutes, take it out, and then put it in the filter;

[0038] c) Take 1 gram of the prepared block copolymer fiber micelle solution, and filter it under a vacuum of 1kPa to evenly cover the surface of the nylon membrane, that is, the amount of block copolymer fiber micelles covered on the base film is 48.8 μg / square cm;

[0039] d) The microfiltration base membrane filtered with the block copolymer fiber micelles solution is placed in the air to dry naturally, and a composite porous membrane with closely packed ...

Embodiment 3

[0042] a) Weigh 0.4 g of polystyrene and poly(2-vinylpyridine) block copolymer fiber micelles (poly(2-vinylpyridine) accounts for 11% of the total volume of the block copolymer), fiber The micelles have a diameter of 47nm and a length of 1-5 microns, dispersed in 100 grams of water, and prepared as a solution with a polymer mass fraction of 0.4%;

[0043] b) Take a piece of polyvinylidene fluoride membrane (the membrane area is about 4.1 square centimeters), soak it in water for 10 minutes, take it out, and then put it in the filter;

[0044]c) Take 61.5 grams of the prepared block copolymer fiber micelles solution, and filter it under a vacuum of 10kPa to evenly cover the surface of the polyvinylidene fluoride membrane, that is, the amount of block copolymer fiber micelles covered on the base film is 60 μg / cm²;

[0045] d) The microfiltration base membrane filtered with the block copolymer fiber micelle solution is placed in the air to dry naturally, and the closely packed b...

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Abstract

The invention relates to a method for preparing a porous membrane based on segmented copolymer fibre micel, and definitely relates to a preparation method for a porous membrane, which adopts a mesoporous layer based on the segmented copolymer fibre micel as a separating layer and adopts a common microfiltration basic membrane as a supporting layer. The method comprises the following specific steps of: scattering the segmented copolymer fibre micel in a solvent to prepare a segmented copolymer fibre micel solution; soaking the microfiltration basic membrane in the liquid, then taking out the microfiltration basic membrane and placing the microfiltration basic membrane in a filter; and pouring the prepared solution in the filter with the microfiltration basic membrane, vacuumizing, and uniformly filtering the fibre micel on the surface of the microfiltration basic membrane; and placing the microfiltration basic membrane for filtering the segmented copolymer fibre micel solution in air so as to naturally dry to form the membrane. The method for preparing the membrane provided by the invention has the advantages that the implementation is simple and easy, the efficiency and the energy conservation are realized, the hole diameter distribution of the prepared composite membrane is narrow, the size is adjustable, and a pH sensitive stimulating response characteristic is realized.

Description

technical field [0001] The present invention relates to a method for preparing a composite porous membrane, in particular to a method for preparing a porous membrane based on block copolymer fiber micelles; that is, the mesoporous layer based on block copolymer fiber micelles The invention relates to a method for preparing a porous membrane with a filter base membrane as a support layer. Background technique [0002] Faced with increasingly prominent energy and environmental issues, membrane separation technology has been widely used in petroleum, chemical, pharmaceutical, energy, food, electronics, etc. due to its low energy consumption, high single-stage separation efficiency, simple process, and environmental friendliness. It plays an increasingly important role in many aspects such as energy conservation and emission reduction, transformation of traditional industries, promotion of economic development, and improvement of quality of life. Improving the separation select...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D67/00B01D69/12
Inventor 汪勇姚雪萍王召根汪朝晖范益群邢卫红
Owner NANJING UNIV OF TECH
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