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A kind of preparation method of polymer nanofiber separation membrane

A technology of nanofibers and polymers, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as difficult industrialization, long preparation cycle, and inability to precisely control the diameter of nanofibers, and achieve properties that can be designed , large flux, good strength effect

Active Publication Date: 2016-04-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a polymer nanofiber separation membrane to make up for the long preparation cycle of the existing polymer nanofiber membrane, the difficulty of industrialization and the inability to precisely control the diameter of the nanofiber, Many issues such as surface properties and sieve pore size

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  • A kind of preparation method of polymer nanofiber separation membrane
  • A kind of preparation method of polymer nanofiber separation membrane
  • A kind of preparation method of polymer nanofiber separation membrane

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preparation example Construction

[0032] According to the present invention, a method for preparing a polymer nanofiber separation membrane with ultra-high flux, good selectivity, and strong anti-fouling, especially polymer nanofibers stacked on the upper or lower surface, includes the following steps:

[0033] (1) Dissolve one or two or more block polymers, additives, and fillers in a mixed solvent containing at least one good solvent and at least one non-solvent to form a casting liquid;

[0034] (2) Cast the film casting solution into a flat film through a film scraper;

[0035] (3) Leave the flat film in the air for 30s-180s to volatilize at least one solvent in the casting liquid to the surrounding environment to form a primary film;

[0036] (4) Immerse the nascent membrane in the coagulation bath, so that the nascent membrane is immersed in the coagulation bath for 2-300s to form a polymer nanofiber separation membrane.

[0037] (5) The solidified polymer nanofiber separation membrane is soaked in water or glycer...

Embodiment 1

[0048] A method for preparing polymer nanofiber separation membrane, the steps are as follows:

[0049] (1) The block copolymer P2VP- composed of polysulfone and poly-2-vinylpyridine b -PSF- b -P2VP, polyethylene glycol (PEG400), and titanium dioxide nanoparticles are dissolved in a mixed solution composed of acetone and dimethylacetamide to form a homogeneous casting solution. Each composition is as follows:

[0050] The mass volume fraction of the block copolymer composed of polysulfone and poly-2-vinylpyridine in the casting solution is 100g / L, and the mass ratio of polysulfone and 2-vinylpyridine in the block polymer is 3: 1. The molecular masses of polysulfone and poly-2-vinylpyridine in block polymers are 120,000 g / mol and 40,000 g / mol, respectively;

[0051] The mass volume fraction of PEG400 in the casting solution is 300g / L;

[0052] The mass volume fraction of titanium dioxide nanoparticles in the casting solution is 400g / L, and the average particle size of titanium dioxide ...

Embodiment 2

[0059] A method for preparing polymer nanofiber separation membrane, the steps are as follows:

[0060] (1) The block copolymer P2VP- composed of polysulfone and poly-2-vinylpyridine b -PSF- b -P2VP, polyethylene glycol (PEG400), and silica nanoparticles are dissolved in a mixed solution composed of acetone and dimethylacetamide to form a homogeneous casting solution. Each composition is as follows:

[0061] The mass volume fraction of the block copolymer composed of polysulfone and poly-2-vinylpyridine in the casting solution is 400g / L, and the mass ratio of polysulfone and poly-2-vinylpyridine in the block polymer is 3 :1. The molecular masses of polysulfone and poly-4-vinylpyridine in block polymers are 180,000 g / mol and 60,000 g / mol, respectively;

[0062] The content of PEG400 is 0.001g / L of the mass volume fraction in the casting liquid;

[0063] The mass volume fraction of silica nanoparticles in the casting solution is 0.001g / L, and the average particle size of silica nanopart...

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Abstract

The invention discloses a preparation method of a polymer nanofiber separation membrane. The method is as follows: dissolving block polymers and additives or fillers in one or more selective solvents to form a casting solution; The casting solution of segmented polymers and additives or fillers is cast by a scraping machine to obtain a polymer film, which stays in the air for a certain period of time, and the obtained nascent film is immersed in a coagulation bath containing a block polymer to polymerize the block Thin film gels form polymer nanofiber separation membranes. The prepared polymer nanofiber is formed by an assembly of block polymers, the porosity of the separation membrane is 10-90%, the effective sieving pore size is between 10-90nm, and the flux is 90-9000L / m2.h .bar, which has the characteristics of large throughput, high separation precision, good hydrophilicity, strong pollution resistance and designable properties.

Description

technical field [0001] The invention belongs to the field of preparation and structure control of novel polymer membrane materials, and in particular relates to a preparation method of a polymer nanofiber separation membrane. Background technique [0002] Polymer separation membrane is a new type of separation material with high efficiency, environmental protection and energy saving. In recent years, it has played an increasingly important role in more and more occasions such as household water purification equipment, wastewater treatment, protein separation, seawater desalination, and hemodialysis. However, most of the current polymer membranes, including polymer hollow fiber membranes and flat sheet membranes, are prepared by solution phase inversion or thermal phase inversion. The separation membrane materials prepared by these methods are determined by the inherent characteristics of the phase separation process. The separation ability of the as-prepared polymer membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/80B01D67/00B01D69/06
Inventor 易砖朱利平王正宝徐又一
Owner ZHEJIANG UNIV