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Preparation method of polymer hollow fiber membrane

A polymer membrane, polymer technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of difficult to control the degree of crystallization, reduced pressure resistance, reduced permeability, etc., and achieves a wide range of choices. , High-strength permeability, strong applicability

Inactive Publication Date: 2016-02-03
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the preparation of crystalline polymer membranes by this method, such as the difficulty in controlling the degree of crystallization, the reduction of the pressure resistance of the membrane due to the local macroporous structure of the outer skin layer, and the decrease in permeability, etc.

Method used

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  • Preparation method of polymer hollow fiber membrane
  • Preparation method of polymer hollow fiber membrane
  • Preparation method of polymer hollow fiber membrane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] A kind of polyvinylidene fluoride (PVDF) hollow fiber membrane, each raw material is calculated by mass percentage, and its preparation method comprises the following steps:

[0032]Step 1: Mix 20% polyvinylidene fluoride, 6% polyethylene glycol, 2% polyvinyl pyrrolidone, 2% ethylene oxide-propylene oxide-ethylene oxide triblock copolymer and 70% N,N-di Methyl acetamide is added into the batching tank (the additive is composed of polyethylene glycol, polyvinylpyrrolidone and ethylene oxide-propylene oxide-ethylene oxide triblock copolymer), stirred at 100°C to fully dissolve, Static defoaming, to obtain the casting solution;

[0033] Step 2: Co-extrude the casting solution obtained in step 1 with glycerol (low temperature core liquid) at a temperature of 5°C through a spinneret, and immerse in glycerol at a temperature of 5°C (low temperature coagulation bath) to form a gel The membrane blank is quickly immersed in pure water (high-temperature coagulation bath) at a te...

Embodiment 2

[0037] A kind of polyvinylidene fluoride (PVDF) hollow fiber membrane, each raw material is calculated by mass percentage, and its preparation method comprises the following steps:

[0038] Step 1: Mix 20% polyvinylidene fluoride, 6% polyethylene glycol, 2% alkylphenol polyoxyethylene ether, 2% ethylene oxide-propylene oxide-ethylene oxide triblock copolymer and 70% two Add methyl sulfoxide into the batching tank (the additive is composed of polyethylene glycol, alkylphenol polyoxyethylene ether and ethylene oxide-propylene oxide-ethylene oxide triblock copolymer), and stir well at 110°C Dissolving, standing for defoaming to obtain casting solution;

[0039] Step 2: Co-extrude the casting solution obtained in step 1 with isopropanol (low temperature core fluid) at 20°C through a spinneret, and immerse in isopropanol (low temperature coagulation bath) at 20°C to form a gel Membrane embryos are then quickly immersed in a high-temperature coagulation bath composed of 30% pure wa...

Embodiment 3

[0043] A kind of polyvinylidene fluoride (PVDF) hollow fiber membrane, each raw material is calculated by mass percentage, and its preparation method comprises the following steps:

[0044] Step 1: 35% polyvinylidene fluoride, 10% polyethylene glycol, 5% glycerin, 5% silicone oil and 45% N,N-dimethylformamide are added in the batching tank (by polyethylene glycol, glycerin and Silicone oil constitutes an additive), fully stirred and dissolved at 150°C, left to stand for defoaming, and obtained a casting solution;

[0045] Step 2: Co-extrude the casting liquid obtained in step 1 with liquid paraffin (low temperature core liquid) at a temperature of 5°C through a spinneret, and immerse in liquid paraffin (low temperature coagulation bath) at a temperature of 5°C to form a gel film blank , and then quickly immersed in a high-temperature coagulation bath composed of 50% pure water and 50% N,N-dimethylformamide at a temperature of 80°C for curing and molding to obtain a nascent PVD...

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Abstract

The invention discloses a preparation method of a polymer hollow fiber membrane. The method includes the steps of: dissolving a high molecular weight polymer in a good solvent, performing extrusion molding, firstly conducting immersion in low temperature coagulation bath to form a gel membrane blank, and then performing immersion into high temperature coagulation bath to conduct curing into a membrane. The method provided by the invention utilizes the dual advantages of gel and phase separation, the polymer hollow fiber membrane has a membrane body of spongy interpenetrating network structure and the exodermis of a precise separation layer, so that the polymer hollow fiber membrane has high strength and high permeability at the same time, and has wide application space in household water purification, sewage treatment, reverse osmosis forepart pretreatment, membrane bioreactors and other fields.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a method for preparing a polymer hollow fiber membrane. Background technique [0002] Polymer membranes can be divided into dense membranes and porous membranes according to their separation accuracy. Dense membranes are mainly used for reverse osmosis, pervaporation and gas separation. The pore size is less than 1nm, so they are called dense membranes. Dense membranes are usually prepared by interfacial polymerization and pervaporation phase inversion. Porous membranes are mainly divided into ultrafiltration and microfiltration, which are widely used in various industries, such as membrane bioreactor (MBR), reverse osmosis front-end pretreatment, brewing and beverage filtration, etc. In view of the differences in separation requirements, there are many preparation methods for porous membranes, mainly including non-solvent induced phase separation (NIPS), thermally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
Inventor 路宏伟朱利平王进方传杰刘鹏君彭博
Owner HUNAN OVAY TECH CO LTD
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