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Preparation method of high-toughness equal-hole polymer hollow fiber separating membrane

A fiber separation and polymer technology, used in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of poor toughness, wide pore size distribution, and inability to achieve high-precision separation of polymer flat membranes, and achieve implementation Simple steps, easy scale and effect of industrial production

Active Publication Date: 2014-09-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A new method for preparing high-toughness homogeneous polymer hollow fiber separation membranes with narrow pore size distribution and good mechanical strength, to make up for the wide pore size distribution of existing polymer hollow fiber separation membranes, the inability to achieve high-precision separation and the current There are many problems such as poor toughness of polymer flat membrane with uniform pore structure

Method used

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  • Preparation method of high-toughness equal-hole polymer hollow fiber separating membrane

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preparation example Construction

[0029] Based on the above principles, a method for preparing a high-toughness homoporous polymer hollow fiber separation membrane of the present invention comprises the following steps:

[0030] (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;

[0031] (2) forming the polymer tubular film through the spinning equipment through the casting solution;

[0032] (3) keeping the polymer tubular membrane in the air for 1-30s to form a polymer hollow fiber nascent membrane;

[0033] (4) The polymer hollow fiber nascent membrane is immersed in a coagulation bath, and the polymer hollow fiber nascent membrane is immersed in the coagulation bath for 2-60s to form a hollow fiber separation membrane of a solidified high-toughness homoporous polymer;

[0034] (5) Soak the solidified high-toughness homoporous polymer hollow fiber membrane in water or glyce...

Embodiment 1

[0045] A method for preparing a high-toughness homogeneous polymer hollow fiber separation membrane, the steps are as follows:

[0046] (1) Dissolve the block copolymer PAN-b-P2VP, polyvinylidene fluoride, and silica nanoparticles composed of polyacrylonitrile and 2-vinylpyridine in a mixed solution composed of tetrahydrofuran and dimethylformamide Form a homogeneous casting solution, wherein each composition is as follows:

[0047] The mass volume fraction of the block copolymer composed of polyacrylonitrile and poly2-vinylpyridine in the casting solution is 100g / L, wherein the mass ratio of polyacrylonitrile and poly2-vinylpyridine in the block polymer 1:1, the molecular mass of polyacrylonitrile and poly 2-vinylpyridine block is 120000g / mol;

[0048] The mass volume fraction of polyvinylidene fluoride in the casting solution is 400g / L, and the molecular mass of polyvinylidene fluoride is 220000g / mol;

[0049] The mass volume fraction of silicon dioxide in the casting solu...

Embodiment 2

[0056] A method for preparing a high-toughness homogeneous polymer hollow fiber separation membrane, the steps are as follows:

[0057] (1) Dissolve the block copolymer PAN-b-P2VP, polyvinylidene fluoride and silica nanoparticles composed of polyacrylonitrile and poly 2-vinylpyridine in a mixed solution composed of tetrahydrofuran and dimethylformamide A homogeneous casting solution is formed in the medium, wherein each composition is as follows:

[0058] The mass volume fraction of the block copolymer composed of polyacrylonitrile and poly2-vinylpyridine in the casting solution is 400g / L, wherein the mass ratio of polyacrylonitrile and poly2-vinylpyridine in the block polymer 2:1, the molecular weights of polyacrylonitrile and poly-2-vinylpyridine are 100000g / mol and 50000g / mol respectively;

[0059] The mass volume fraction of polyvinylidene fluoride in the casting solution is 400g / L, and the molecular mass of polyvinylidene fluoride is 1015000g / mol;

[0060] The mass volu...

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Abstract

The invention discloses a preparation method of a high-toughness equal-hole polymer hollow fiber separating membrane. The preparation method comprises the following steps: dissolving a segmented copolymer and an additive or packing into a selective solvent which contains a segmented copolymer, so as to form a casting membrane solution, spinning the casting membrane solution to form hollow fibers, staying in air for appropriate time, and then immerging nascent fibers into a coagulating bath which contains a segmented copolymer, so as to solidify the nascent fibers to form the high-toughness equal-hole polymer hollow fiber separating membrane. According to the high-toughness equal-hole polymer hollow fiber membrane prepared by using the method, the ratio of the maximum hole diameter D to the minimum hole diameter d is less than 2.5, the breaking elongation is 5% to 1000%, and the tensile strength is 5MPa to 500MPa. The prepared high-toughness equal-hole polymer hollow fiber membrane has the relatively high separation accuracy and the relatively good processing and packaging performances.

Description

technical field [0001] The invention belongs to the field of preparation and structure control of high-performance polymer membrane materials, and in particular relates to a preparation method of a high-toughness homogeneous polymer hollow fiber separation membrane. Background technique [0002] Membrane separation technology is a new high-efficiency, environmentally friendly and energy-saving separation technology that has developed rapidly in recent years. and many other occasions are playing an increasingly important role. In terms of packing density, specific surface area, ease of installation and mechanical strength, polymer hollow fiber membranes have better energy-saving efficiency and more convenient packaging conditions than polymer flat membranes, so they occupy an important position in industrial wastewater treatment and municipal engineering. with major application markets. However, most of the current polymer membranes, including polymer hollow fiber membranes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D69/08B01D67/00
Inventor 易砖朱利平王正宝徐又一
Owner ZHEJIANG UNIV
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