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Reinforced 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 the membrane not playing a strengthening role, and achieve the improvement of water flux and high open porosity. , good separation performance

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

[0034] A method for preparing a reinforced polyvinylidene fluoride hollow fiber microporous membrane, the specific steps are as follows:

[0035] (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 128-186 ° C, and left to defoam for 4-6 hours to form a casting solution;

[0036] (2) Preparation of support body: Weave the multifilament fiber into a circular hollow braid with an outer diameter of 0.8-3.2 mm, wash and remove the oil and pollutants on the surface of the braid, treat it with a softener, and dry it in the air. get support

[0037] (3) Preparation of external coagulation liquid: add external coagulation liquid solvent, external coagulation liquid non-solvent and water into the coagulation bath according to the mass ratio of 1: (0.5-2.0): (0...

Embodiment 2

[0052] A method for preparing a reinforced polyvinylidene fluoride hollow fiber microporous membrane, the specific steps are as follows:

[0053] (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 128°C, and let stand for 4 hours for defoaming , forming a casting solution;

[0054] (2) Preparation of the support body: the polyester multifilament fiber was woven into a circular hollow braid with an outer diameter of 0.8 mm by a 9-spindle high-speed braiding machine, washed to remove oil stains and pollutants on the surface of the braid, treated with a softener, and dried in the air. Dry, get the support body;

[0055] (3) Preparation of the 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 the external coagulation solution;

...

Embodiment 3

[0063] A method for preparing a reinforced polyvinylidene fluoride hollow fiber microporous membrane, the specific steps are as follows:

[0064] (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;

[0065] (2) Preparation of the support body: The polyester multifilament fiber is woven into a circular hollow braid with an outer diameter of 1mm by a 14-spindle high-speed braiding machine, washed to remove oil and pollutants on the surface of the braid, treated with a softener, and dried in the air , get the support body;

[0066] (3) Preparation of external coagulation liquid: add 100 g of trimethyl phosphate, 80 g of propylene glycol, and 1 g of water into the coagulation bath, and stir evenly at room temperature to obtain an extern...

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PUM

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Abstract

The invention discloses a preparation method of a reinforced polyvinylidene fluoride hollow fiber micropore filter membrane. The preparation method includes the steps of: preparing a film casting liquid; preparing a support body; 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.

Description

technical field [0001] The invention belongs to the technical field of membrane materials for water treatment, and in particular relates to a reinforced 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 CN2007...

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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