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Preparation method for polymer nanofiber separation membrane

A nanofiber and polymer technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of long preparation period, inability to precisely control the diameter of nanofibers, difficult to industrialize, etc., and achieve large flux , the properties can be designed, the effect of strong pollution resistance

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • 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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  • Preparation method for polymer nanofiber separation membrane
  • Preparation method for polymer nanofiber separation membrane
  • Preparation method for 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-pollution properties, especially polymer nanofibers stacked on the upper or lower surface, comprises the following steps:

[0033] (1) Dissolving one or more than two 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 solution;

[0034] (2) The cast film solution is cast into a flat film through a film scraping machine;

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

[0036] (4) Immersing the nascent membrane in a coagulation bath, and immersing the nascent membrane in the coagulation bath for 2-300s to form a polymer nanofiber separation membrane.

[0037] (5) Soak the solidified polymer nanofiber separat...

Embodiment 1

[0048] A preparation method of a polymer nanofiber separation membrane, the steps are as follows:

[0049] (1) The block copolymer P2VP- 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, the components of which are as follows:

[0050] The mass volume fraction of the block copolymer composed of polysulfone and poly 2-vinylpyridine in the casting solution is 100 g / 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 the block polymer are 120000 g / mol and 40000 g / mol respectively;

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

[0052] The mass volume fraction of titanium dioxide nanoparticles in the casting solution is 400 g / L, and the average particle diameter of titanium dioxide nanoparticles is 30nm; ...

Embodiment 2

[0059] A preparation method of a polymer nanofiber separation membrane, the steps are as follows:

[0060] (1) The block copolymer P2VP- 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, the components of which are as follows:

[0061] The mass volume fraction of the block copolymer composed of polysulfone and poly2-vinylpyridine in the casting solution is 400 g / L, and the mass ratio of polysulfone and poly2-vinylpyridine in the block polymer is 3:1, the molecular masses of polysulfone and poly-4-vinylpyridine in the block polymer are 180,000 g / mol and 60,000 g / mol, respectively;

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

[0063] The mass volume fraction of silica nanoparticles in the casting solution is 0.001 g / L, and the average particle diameter of silica nanoparticles is 150nm;

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Abstract

A disclosed preparation method for a polymer nanofiber separation membrane comprises: dissolving a block polymer and an additive or a filling material in a or a plurality of selective solvents, so as to form a casting solution; performing tape casting on the casting solution dissolving the block polymer and the additive or the filling material by using membrane casting equipment, so as to obtain a polymer membrane; and staying in air for a period, dipping the obtained primary membrane in a coagulation bath containing a block polymer, so as to enable the block polymer membrane to be gelled for forming the polymer nanofiber separation membrane. The prepared polymer nanofiber is formed from assembly of the block polymer, the porosity of the separation membrane is 10-90%, the effective screening aperture is 10-90 nm, the flux is 90-9000 L / m<2>*h*bar, and the polymer nanofiber separation membrane has the characteristics of high flux, high separation precision, good in hydrophilia, strong contamination 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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IPC IPC(8): B01D71/80B01D67/00B01D69/06
Inventor 易砖朱利平王正宝徐又一
Owner ZHEJIANG UNIV