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Reinforced polyvinylidene fluoride hollow fiber ultrafiltration membrane and preparation method thereof

A polyvinylidene fluoride and ultrafiltration membrane technology, applied in the field of membrane separation, can solve the problems of affecting the filtration precision and flux, low ultrafiltration membrane strength, broken holes and broken wires, etc., to improve the service life and practicability, Improve the number of backwashes and the effect of strength enhancement

Active Publication Date: 2016-09-07
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyvinylidene fluoride hollow fiber ultrafiltration membranes widely used at present have relatively obvious defects. There will be holes and broken wires, which cannot meet the service strength requirements of submerged membrane modules for hollow fiber membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Add polyvinylidene fluoride, N-methylpyrrolidone and polyethylene glycol (PEG-6000) into the reaction kettle with a mass ratio of 20:77:3, stir at 55°C to dissolve, stir for 24 hours, and form Uniform film-making solution;

[0026] 2) Filter the film-forming liquid obtained in step 1) through a 200-mesh steel mesh, and then vacuumize the film-forming liquid at room temperature for degassing;

[0027] 3) Put the film-making solution after degassing in step 2) in 0.3MPa N 2 Extrude through the spinning head under pressure, and at the same time, introduce a glass fiber with a diameter of 0.1 μm into the film-making liquid of the spinning head and extrude together with the film-making liquid;

[0028] 4) Submerge the as-spun fiber extruded in step 3) in a coagulation bath and solidify it into a hollow fiber membrane;

[0029] 5) Soak the hollow fiber membrane obtained in step 4) in a glycerol solution to preserve pores, and then soak in water to obtain a reinforced pol...

Embodiment 2

[0032] 1) Add polyvinylidene fluoride, N-methylpyrrolidone and polyethylene glycol (PEG-6000) into the reaction kettle with a mass ratio of 20:77:3, stir at 55°C to dissolve, stir for 24 hours, and form Uniform film-making solution;

[0033] 2) Filter the film-forming liquid obtained in step 1) through a 200-mesh steel mesh, and then vacuumize the film-forming liquid at room temperature for degassing;

[0034] 3) Put the film-making solution after degassing in step 2) in 0.3MPa N 2 It is extruded through the spinning head under pressure, and at the same time, a rolled glass fiber with a diameter of 0.1 μm is introduced into the film-making solution of the spinning head. The glass fiber is continuously rotated under the action of the pulling head. Distributed around the film liquid and extruded together with the film making liquid;

[0035] 4) Submerge the as-spun fiber extruded in step 3) in a coagulation bath and solidify it into a hollow fiber membrane;

[0036] 5) Soak t...

Embodiment 3

[0039] 1) Add polyvinylidene fluoride, N-methylpyrrolidone and polyethylene glycol (PEG-6000) into the reaction kettle with a mass ratio of 20:77:3, stir at 55°C to dissolve, stir for 24 hours, and form Uniform film-making solution;

[0040] 2) Filter the film-forming liquid obtained in step 1) through a 200-mesh steel mesh, and then vacuumize the film-forming liquid at room temperature for degassing;

[0041] 3) Put the film-making solution after degassing in step 2) in 0.3MPa N 2 Extrude through the spinning head under pressure, and at the same time, introduce three glass fibers with a diameter of 0.1 μm into the film-making liquid of the spinning head and extrude together with the film-making liquid;

[0042] 4) Submerge the as-spun fiber extruded in step 3) in a coagulation bath and solidify it into a hollow fiber membrane;

[0043] 5) Soak the hollow fiber membrane obtained in step 4) in a glycerol solution to preserve pores, and then soak in water to obtain a reinforce...

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Abstract

The invention discloses a reinforced polyvinylidene fluoride hollow fiber ultrafiltration membrane and a preparation method thereof; the membrane wall of the reinforced polyvinylidene fluoride hollow fiber ultrafiltration membrane is filled with reinforcing fibers; the reinforced polyvinylidene fluoride hollow fiber ultrafiltration membrane is filled with reinforcing fibers; The preparation method of the vinylidene fluoride hollow fiber ultrafiltration membrane includes the following steps: 1) mixing and stirring polyvinylidene fluoride, solvent and additives to prepare a membrane-making liquid; 2) degassing after filtering the membrane-making liquid; 3) degassing The final film-making liquid is extruded through the spinning head, and at the same time, the continuous reinforcing fiber is introduced into the film-making liquid of the spinning head and extruded together with the film-making liquid; 4) The extruded primary fiber is immersed in a coagulation bath for coagulation into a hollow fiber membrane; 5) soak the hollow fiber membrane in a glycerin solution to preserve the pores, and then soak it in water. The invention enhances the strength of the polyvinylidene fluoride hollow fiber ultrafiltration membrane without destroying or changing the micropore structure of the membrane, thereby improving service life and practicability.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a reinforced polyvinylidene fluoride hollow fiber ultrafiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a green and efficient new separation technology. Ultrafiltration has broad prospects in the fields of water purification, chemical separation and biological separation. Hollow fiber ultrafiltration membrane is a widely used filter medium. The substances it can remove include biomolecules, high molecular polymers, and colloidal substances, and can realize recovery, concentration, extraction and other processes. The hollow fiber ultrafiltration membrane has the advantages of high packing density, small device volume, low energy consumption, and convenient operation. It is widely used in the fields of biology, pharmacy, food, chemical industry, metallurgy, and sewage treatment. [0003] P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 曾凯王呈祥魏正玺刁云涛普雪涛张晨晓钟方强
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD