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Hydrophilic polyvinylidene fluoride-based hollow-fiber separation membrane, and method for manufacturing same

A polyvinylidene fluoride and fiber separation technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as weak breaking strength and coating layer peeling, and achieve small pore size, excellent mechanical strength, The effect of excellent membrane fouling resistance

Active Publication Date: 2014-06-11
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the coated membrane of the Korea Research Institute of Chemistry, due to the use of the inner support layer, a high-strength separation membrane can be produced, but when the separation membrane is used, the coating layer peels off, and if there is no support When manufactured in layers, there is a disadvantage that the breaking strength becomes very weak

Method used

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  • Hydrophilic polyvinylidene fluoride-based hollow-fiber separation membrane, and method for manufacturing same
  • Hydrophilic polyvinylidene fluoride-based hollow-fiber separation membrane, and method for manufacturing same
  • Hydrophilic polyvinylidene fluoride-based hollow-fiber separation membrane, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Polyvinylidene fluoride resin (PVDF, Solvay (Solvay), solef6010) 35% by weight, γ-butyrolactone (GBL) 55% by weight, polyetherimide (PEI, SABIC innovation plasitics) company, ULTEM1010) were mixed at 10% by weight, stirred in a reactor at 170°C filled with nitrogen for 12 hours, and then transferred to a stabilization tank under the same state for 12 hours to prepare a spinning composition. Then, the spinning composition and the internal coagulation bath (GBL80% by weight, water 20% by weight) are simultaneously sprayed through the nozzle to form a hollow fiber, and immersed in the non-solvent contained in the external coagulation bath (phase transfer tank), Thus, a hollow fiber membrane is formed. Pure water was used as the non-solvent, the constant pump speed of the internal coagulation bath was 4.5ml / min, and the temperature was 25°C. In order to transfer the spinning solution, the nitrogen pressure in the reactor was set to 5kgf / cm as the discharge pressure 2 As a...

Embodiment 2

[0057] A hollow fiber separation membrane was produced in the same manner as in Example 1, except that polyimide (PI, Ciba polymer company, Matrimid 5218) was used instead of polyetherimide in Example 1.

Embodiment 3

[0059] A hollow fiber separation membrane was produced in the same manner as in Example 1, except that polyamide (PA, EMS-Grivory, Grivory G16) was used instead of polyetherimide in Example 1.

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Abstract

In general, a process manufacturing for polyvinylidene fluoride-based separation membrane and a membrane manufactured using same employ a non-solvent induced phase separation method and a thermally induced phase separation method. However, the hydrophilic polyvinylidene fluoride-based hollow-fiber separation membrane according to the present invention is manufactured using a spinning solution that contains a predetermined hydrophilic polymer and a poor solvent for excellent mechanical strength, and has small pores, a high permeation flow rate, and high membrane contamination resistance. Also, when a separation membrane for water treatment is manufactured, predetermined post-processing processes for providing porosity and hydrophilicity are eliminated, such that the separation membrane may be manufactured economically and efficiently.

Description

technical field [0001] The invention relates to a method for manufacturing a hydrophilic polyvinylidene fluoride (PVDF) hollow fiber separation membrane, more specifically, to a method for preparing a hydrophilic polyvinylidene fluoride (PVDF), a hydrophilic polymer, a specific weak A spinning solution of a solvent, a PVDF hollow fiber separation membrane produced by spinning the spinning solution and subjecting it to thermally induced phase transfer, and a manufacturing method thereof. Background technique [0002] In recent years, membrane separation technologies using separation membranes have been widely used as water purification and sewage treatment processes. Usually, when the separation membrane used for water treatment is used to filter polluted raw water, the pollution source is adsorbed on the surface of the membrane and grows, thereby causing pollution on the surface of the membrane. Increased pressure and gradually reduced throughput will eventually lead to a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/04B01D71/34B01D69/02B01D67/00
CPCB01D69/02B01D71/34B01D69/08B01D69/087B01D2325/24B01D69/04B01D67/00
Inventor 李秀珉李昌镐吴晛焕朴柱荣李俊硕金玟廷
Owner LG CHEM LTD
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