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Polyvinylidene fluoride hollow fiber micropore filter membrane and preparation method of same

A polyvinylidene fluoride, microporous membrane technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problem of lack of strengthening effect, simplify operation, improve water flux, and change viscosity and spinnability effects

Active Publication Date: 2017-08-29
开源环保(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hollow fiber membrane reinforced by this method can only play a strengthening role in the axial direction, and can not play any strengthening role in the radial direction of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of a polyvinylidene fluoride hollow fiber microporous membrane, the specific steps are as follows:

[0034] (1) Preparation of casting solution: mix PVDF resin, casting solution solvent, casting solution non-solvent, hydrophilic modifier, and inorganic additives in mass ratio 1:(1.6-3.0):(0.02-0.4):( 0.01-0.2): The ratio of (0-0.1) is added to the stirring tank, heated and dissolved at a temperature of 128-186°C, and left to defoam for 4-6 hours to form a casting solution;

[0035] (2) Preparation of core liquid: Add core liquid solvent, core liquid non-solvent and water into the core liquid tank at a mass ratio of 1:(0.5-2.0):(0-0.1), and stir evenly at room temperature. Obtain internal coagulation core fluid;

[0036] (3) Preparation of external coagulation liquid: add external coagulation liquid solvent, external coagulation liquid non-solvent and water into the coagulation bath at a mass ratio of 1:(0.5-2.0):(0-0.1), and stir evenly at room tem...

Embodiment 2

[0050] A preparation method of a polyvinylidene fluoride hollow fiber microporous membrane, the specific steps are as follows:

[0051] (1) Preparation of casting solution: Add 100g of PVDF resin, 160g of casting solution solvent, 2g of glycerin, and 1g of polyvinyl acetate into the stirring tank in a certain order, heat and dissolve at a temperature of 128°C, and let stand for 4 hours for defoaming , forming a casting solution;

[0052] (2) Preparation of core liquid: add 100 g of triethyl phosphate and 50 g of glycerin into the core liquid tank, stir evenly at room temperature to obtain internally coagulated core liquid;

[0053] (3) Preparation of external coagulation solution: Add 100 g of triethyl phosphate and 50 g of glycerin into the coagulation bath, stir evenly at room temperature to obtain an external coagulation solution;

[0054] (4) Spinning: Squeeze the casting solution prepared in step (1) into the spinneret, the temperature of the spinneret is 100°C, a natura...

Embodiment 3

[0062] A preparation method of a polyvinylidene fluoride hollow fiber microporous membrane, the specific steps are as follows:

[0063] (1) Preparation of casting solution: Add 100g of PVDF resin, 180g of casting solution solvent, 5g of propylene glycol, 5g of polyvinyl acetate, and 1g of nano glass into the stirring tank in a certain order, heat and dissolve at 130°C, and let stand Degassing for 5 hours to form a casting solution;

[0064] (2) Preparation of core liquid: Add 100g of triethyl phosphate, 80g of propylene glycol, and 1g of water into the core liquid tank, and stir evenly at room temperature to obtain an internally coagulated core liquid;

[0065] (3) Preparation of external coagulation solution: Add 100 g of triethyl phosphate, 80 g of propylene glycol, and 1 g of water into the coagulation bath, and stir evenly at room temperature to obtain an external coagulation solution;

[0066] (4) Spinning: Squeeze the casting solution prepared in step (1) into the spinn...

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Abstract

The invention discloses a preparation method of a polyvinylidene fluoride hollow fiber micropore filter membrane. The preparation method includes the steps of: preparing a film casting liquid; preparing a core liquid; preparing an outer solidifying liquid; performing spinning; performing rinsing replacement; and performing thermal treatment. The method is used for preparing the PVDF hollow fiber micropore filter membrane through combination of thermally induced phase separation and solution phase conversion; compared with the solution phase conversion method, finger-like holes are eliminated, and the microstructure of the membrane is more reasonable; and compared with the thermally induced phase separation method, the method simplifies operations, is free of solvent extraction and reduces cost; in the film casting liquid, inorganic additives, such as nano glass powder or nano silicon carbide, are added, so that strength of membrane filaments is enhanced, and especially, pressure resistance and wear resistance of the membrane filaments are improved. The method can be used for preparing internal-pressure or external-pressure membrane filaments having a skin layer. The microstructure under the skin layer is also in a network structure or a particle stacking structure. The membrane filaments have good separation performance and high flux.

Description

technical field [0001] The invention belongs to the technical field of membrane materials for water treatment, and in particular relates to a polyvinylidene fluoride hollow fiber microporous filter membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) has good thermal and chemical stability, outstanding weather resistance and aging resistance, and good mechanical properties, so PVDF hollow fiber microporous membranes have been widely used in the separation industry, especially in the sewage treatment industry. Wide range of applications. [0003] The PVDF hollow fiber filter membrane used for sewage treatment has relatively high requirements on the flux, anti-pollution performance and strength of the membrane. [0004] Membrane flux and antifouling performance are related to the hydrophilicity of the membrane, and blending modification is usually used to increase the hydrophilicity of the membrane. Patents CN200710110891.6,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00C02F1/44
CPCB01D67/0002B01D69/08B01D71/34B01D2325/24C02F1/444
Inventor 杨一鸣
Owner 开源环保(集团)有限公司
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