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A method for preparing polymer hollow fiber porous membrane by chemical reaction-induced phase inversion

A technology of chemical reaction and induced phase, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of improving performance and membrane flux

Inactive Publication Date: 2016-01-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The casting liquid film cast into a film remains homogeneous, but due to the volatilization of solvent, the exchange of solvent and non-solvent or the absorption of non-solvent water, a concentration gradient along the cross-sectional direction is formed in the casting liquid

Method used

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  • A method for preparing polymer hollow fiber porous membrane by chemical reaction-induced phase inversion
  • A method for preparing polymer hollow fiber porous membrane by chemical reaction-induced phase inversion
  • A method for preparing polymer hollow fiber porous membrane by chemical reaction-induced phase inversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] ①Preparation of casting solution: Stir and blend polymer materials, solvents, additives and chemical porogens in a certain proportion at a temperature of 50-80°C for 6-24 hours, and then stand at a constant temperature of 50-80°C for defoaming 12-24h to obtain a homogeneous casting solution.

[0037] ② Preparation of core liquid and outer gel bath: mix a certain proportion of deionized water and inorganic salts evenly, and set aside.

[0038] ③Hollow fiber spinning: using dry-wet spinning equipment at the set spinning speed, the core liquid is injected into the spinneret according to the set core liquid volume and the homogeneous casting liquid, and together from the spinneret Extruded to produce hollow fiber membranes.

[0039] ④Phase inversion treatment: After the hollow fiber membrane obtained in step ③ is subjected to a dry spinning process of 0-30cm, it is sequentially entered into the first gel bath and the second gel bath for gel phase inversion, forming a micro...

Embodiment 2

[0046] The steps are as shown in Example 1, and the composition is shown in the table below.

[0047]

[0048] The inner diameter of the obtained hollow fiber porous membrane is about 1.40 mm, the outer diameter is about 1.84 mm, and the pure water flux at 0.1 MPa is 44.5 L / m 2 s or more, the rejection rate of BSA is more than 98%.

Embodiment 3

[0050] The steps are as shown in Example 1, and the composition is shown in the table below.

[0051]

[0052] The inner diameter of the obtained hollow fiber porous membrane is about 1.10 mm, the outer diameter is about 1.77 mm, and the pure water flux at 0.1 MPa is 124 L / m 2 s or more, the rejection rate of BSA is more than 91%.

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Abstract

The invention discloses a method for preparing a macromolecule hollow porous fiber membrane by using a chemical reaction inductive phase conversion method, and belongs to the field of membrane preparation. The method for preparing the macromolecule hollow porous fiber membrane by using the chemical reaction inductive phase conversion method comprises the following steps of: preparing a homogeneous membrane casting liquid; extruding the membrane casting liquid and a core liquid from a spinning nozzle, and forming a membrane in outer gel bath; and carrying out chemical post treatment on the prepared membrane, so as to obtain the hollow porous fiber membrane which is uniform in pore diameter, high in membrane flux and high in pollution resistance. The method for preparing the macromolecule hollow porous fiber membrane by using the chemical reaction inductive phase conversion method, provided by the invention, is characterized in that pores are formed by chemical reaction induction through changing the composition of the core liquid and the outer gel bath or types of chemical reaction porogens and utilizing the reaction among the core liquid, the outer gel bath and the chemical porogens, and therefore, the macromolecule hollow porous fiber membrane which is uniform in pore diameter distribution, good in pollution resistance, and high in flux.

Description

technical field [0001] The invention belongs to the field of membrane preparation, and relates to a method for preparing a polymer hollow fiber porous membrane by a phase inversion method, in particular to a method for preparing a polymer hollow fiber porous membrane by a chemical reaction-induced phase inversion method. Background technique [0002] There are many preparation methods for polymer porous membranes, the most common of which are non-solvent induced phase separation (phase inversion method), thermally induced phase separation method and melt stretching method. The forms of polymer porous membranes are flat plate, hollow fiber, capillary and tubular. Among them, the present invention is designed to prepare the polymer hollow fiber porous membrane by using the non-solvent-induced phase separation method. [0003] The phase inversion method is a well-developed method for preparing polymer microporous membranes. The process can be divided into three stages: [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D71/42B01D71/16B01D67/00
Inventor 王湛史龙月杨文涛陈娜
Owner BEIJING UNIV OF TECH
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