Novel method for amphiphilic copolymer modified PVDF (Polyvinylidene Fluoride) hollow fiber ultra-filtration membranes

An amphiphilic copolymer and ultra-fine filtration technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced flux, easy rupture, secondary pollution, etc., and achieve anti-pollution performance. Excellent, improved mechanical strength, high retention effect

Inactive Publication Date: 2013-04-03
SHAOXING REEYEE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the main problems existing in the existing UF / MF membrane materials, the UF / MF membrane mainly has the following problems: (1) The membrane material does not have permanent hydrophilicity, and the anti-pollution performance is not good; (2) There is a contradiction between the flux and the rejection rate , the improvement of the flux is often at the cost of reducing the rejection rate, and the increase of the rejection rate often reduces its flux; (3) The strength of the membrane material is poor and it is easy to break, especially the polymer membrane prepared by the phase inversion method; (4) It is usually necessary to add a protective solution to moisturize the membrane, which is not conducive to the storage, transportation and use of the membrane, and it is easy to breed bacteria and cause secondary pollution

Method used

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  • Novel method for amphiphilic copolymer modified PVDF (Polyvinylidene Fluoride) hollow fiber ultra-filtration membranes
  • Novel method for amphiphilic copolymer modified PVDF (Polyvinylidene Fluoride) hollow fiber ultra-filtration membranes
  • Novel method for amphiphilic copolymer modified PVDF (Polyvinylidene Fluoride) hollow fiber ultra-filtration membranes

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Effect test

Embodiment 1

[0030] Embodiment 1 The new method of amphiphilic copolymer modified PVDF hollow fiber ultra-microfiltration membrane of the present invention comprises the following steps:

[0031] (1) Fully mix PVDF, amphiphilic copolymer, porogen, non-solvent and solvent, and dissolve to obtain casting solution;

[0032] (2) Send the casting solution to the hollow fiber membrane spinning machine for extrusion, enter the coagulation bath for solidification and molding, and obtain the PVDF hollow fiber membrane after winding and collecting;

[0033] (3) Soak the PVDF hollow fiber membrane in hot water;

[0034] (4) After cleaning and drying, the finished product is obtained.

[0035] Among them, the mass percent concentration of each component in the casting solution is: PVDF 15%, amphiphilic copolymer 5%, porogen 4%, non-solvent 1%, solvent 75%.

[0036] The molecular weight of PVDF is 3×10 5 - 1×10 6 ; The amphiphilic copolymer is poly(methyl methacrylate-monomethyl ether polyoxyeth...

Embodiment 2

[0043] Embodiment 2 The new method of amphiphilic copolymer modified PVDF hollow fiber ultra-microfiltration membrane of the present invention comprises the following steps:

[0044] (1) Fully mix PVDF, amphiphilic copolymer, porogen, non-solvent and solvent, and dissolve to obtain casting solution;

[0045] (2) Send the casting solution to the hollow fiber membrane spinning machine for extrusion, enter the coagulation bath for solidification and molding, and obtain the PVDF hollow fiber membrane after winding and collecting;

[0046] (3) Soak the PVDF hollow fiber membrane in hot water;

[0047] (4) After cleaning and drying, the finished product is obtained.

[0048] Among them, the mass percent concentration of each component in the casting solution is: PVDF 25%, amphiphilic copolymer 9.5%, porogen 15%, non-solvent 0.5%, solvent 50%.

[0049] The molecular weight of PVDF is 1×10 5 - 5×10 5 ; The amphiphilic copolymer is poly(methyl methacrylate-monomethyl ether pol...

Embodiment 3

[0056] Embodiment 3 The new method of amphiphilic copolymer modified PVDF hollow fiber ultra-microfiltration membrane of the present invention comprises the following steps:

[0057] (1) Fully mix PVDF, amphiphilic copolymer, porogen, non-solvent and solvent, and dissolve to obtain casting solution;

[0058] (2) Send the casting solution to the hollow fiber membrane spinning machine for extrusion, enter the coagulation bath for solidification and molding, and obtain the PVDF hollow fiber membrane after winding and collecting;

[0059] (3) Soak the PVDF hollow fiber membrane in hot water;

[0060] (4) After cleaning and drying, the finished product is obtained.

[0061] Among them, the mass percentage concentration of each component in the casting solution is: PVDF 20%, amphiphilic copolymer 12%, porogen 7%, non-solvent 1%, solvent 60%.

[0062] The molecular weight of PVDF is 2×10 5 - 4×10 5 ; The amphiphilic copolymer is poly(methyl methacrylate-monomethyl ether poly...

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Abstract

The invention relates to a novel method for amphiphilic copolymer modified PVDF (Polyvinylidene Fluoride) hollow fiber ultra-filtration membranes, and belongs to the technical field of preparation of PVDF membranes. The method comprises the following steps: (1) PVDF, amphiphilic copolymer, pore-foaming agent, nonsolvent and solvent are fully mixed, and are dissolved to obtain membrane casting liquid; (2) the membrane casting liquid is fed in a hollow fiber membrane spinning machine for extruding, is condensed and formed in a coagulating bath, and is wound and collected to obtain the PVDF hollow fiber membranes; (3) the PVDF hollow fiber membranes are dipped in hot water; and (4) finished products are obtained after cleaning and drying. The amphiphilic copolymer modified PVDF hollow fiber ultra-filtration membranes, prepared by the method, have the characteristics of permanent hydrophilcity, excellent pollution resistance, high throughput and high reject rate.

Description

technical field [0001] The invention relates to a new method for amphiphilic copolymer modified PVDF hollow fiber ultrafine filtration membrane, which belongs to the technical field of polyvinylidene fluoride (PVDF) membrane preparation. Background technique [0002] At present, the UF / MF membrane technology used in drinking water equipment is expanding in depth and breadth in the industry. New membrane materials are constantly being developed and applied, and penetrate into more industries. The market in this field is growing expanding day by day. In view of the main problems existing in the existing UF / MF membrane materials, the UF / MF membrane mainly has the following problems: (1) The membrane material does not have permanent hydrophilicity, and the anti-pollution performance is not good; (2) There is a contradiction between the flux and the rejection rate , the improvement of the flux is often at the cost of reducing the rejection rate, and the increase of the rejec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 毛中水胡光兴
Owner SHAOXING REEYEE ENVIRONMENTAL PROTECTION TECH
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