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Preparation method of graphene hybrid perfluoropolymer hollow fiber membrane

A perfluoropolymer, fiber membrane technology, applied in chemical instruments and methods, separation methods, membranes, etc., can solve the problems of inability to industrialize production, the separation layer is easy to fall off, and the bonding force is poor, and achieves the performance of not easy to fall off and separation. Stabilizing and increasing porosity

Inactive Publication Date: 2019-12-27
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0006] The document with application number 201810713774.7 discloses a preparation method of continuous oil-water separation hollow fiber membrane, which uses concentrated dispersion liquid as the separation layer, glass fiber or carbon fiber hollow braided tube as the support layer, and adopts electrospinning technology to prepare a membrane that can be used in continuous Hollow fiber membrane for oil-water separation, but this method is complicated in process, low in efficiency, and cannot be produced industrially, and the support layer is an inorganic filament braided tube, which has poor bonding force with the separation layer, making the separation layer easy to fall off

Method used

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  • Preparation method of graphene hybrid perfluoropolymer hollow fiber membrane
  • Preparation method of graphene hybrid perfluoropolymer hollow fiber membrane
  • Preparation method of graphene hybrid perfluoropolymer hollow fiber membrane

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preparation example Construction

[0027] The present invention provides a method for preparing graphene hybrid perfluoropolymer hollow fiber membrane (method for short), which is characterized in that the method includes the following steps:

[0028] 1) Preparation of the support layer: use the two-dimensional weaving technology to weave a hollow braided tube with perfluoropolymer filaments as raw materials, and after heat setting treatment, the hollow braided tube is used as the support layer of the hollow fiber membrane;

[0029] The braiding pitch of the hollow braided tube is 0.5-1mm, and the speed of the two-dimensional braiding machine is 600-900r / min; the heat setting process is to place the hollow braided tube in an oven at 70-90℃ for 10-30min or 70- The heating rod at 90℃ is passed through the hollow braided tube for 10-30 minutes; the heat setting is to prevent the braided tube from being compressed during the concentric circle coating spinning process, and at the same time release the internal stress;

[0...

Embodiment 1

[0041] 1) Preparation of the support layer: the hollow braided tube of FEP filaments is braided by two-dimensional braiding technology, and after heat setting treatment in a 90℃ oven for 10 minutes, the hollow braided tube is used as the support layer of the hollow fiber membrane, and the braiding pitch is 1mm , The machine speed is 800r / min;

[0042] 2) Pretreatment of the surface of the support layer: immerse the hollow braided tube obtained in step 1) into a 1wt% NaOH solution to remove the oil on the surface of the FEP filament, and then wash the residual alkaline solution with deionized water at room temperature Let air dry for later use;

[0043] 3) Preparation of separation layer casting liquid: Mix the FEP concentrated dispersion emulsion with 15wt% of the casting liquid system mass fraction, GE with 0.2wt% of the casting liquid system mass fraction and deionized water uniformly mixed, after ultrasonic vibration, Then add 5wt% of PVA which accounts for the mass fraction of...

Embodiment 2

[0050] 1) Preparation of the support layer: the hollow braided tube of FEP filaments is braided by two-dimensional braiding technology. After the heating rod at 90℃ is passed through the hollow braided tube for 15 minutes, the hollow braided tube is used as the support of the hollow fiber membrane. Layer, the knitting pitch is 1mm, and the machine speed is 800r / min;

[0051] 2) Pretreatment of the surface of the support layer: immerse the hollow braided tube obtained in step 1) into a 1wt% NaOH solution to remove the oil on the surface of the FEP filament, and then wash the residual alkaline solution with deionized water at room temperature Let air dry for later use;

[0052] 3) Preparation of separation layer casting liquid: Mix the FEP concentrated dispersion emulsion with 15wt% of the casting liquid system mass fraction, GE with 0.2wt% of the casting liquid system mass fraction and deionized water uniformly mixed, after ultrasonic vibration, Then add PVA accounting for 7wt% of ...

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Abstract

The invention discloses a preparation method of a graphene hybrid perfluoropolymer hollow fiber membrane. Polyperfluorinated ethylene propylene or poly (tetrafluoroethylene-perfluoroalkoxy vinyl ether) long filaments prepared by a melt spinning method are used as weaving raw materials; wherein the graphene hybrid perfluoropolymer hollow fiber membrane for oil-water separation is obtained by meansof a perfluoropolymer concentrated dispersion emulsion and graphene as membrane casting solution raw materials and polyvinyl alcohol as an adhesive through the processes of weaving, membrane casting solution preparation, coating, curing, sintering and the like. The method is simple in process, short in flow, high in controllability, convenient to operate, low in energy consumption, high in production efficiency and easy for industrial production. The graphene hybrid perfluoropolymer hollow fiber membrane prepared by the method is not subjected to secondary modification treatment, and only thehydrophobic and oleophylic characteristics of the perfluoropolymer and the graphene are utilized, so that the prepared hollow fiber membrane is good in mechanical property, excellent in chemical reagent resistance and aging resistance, good in hydrophobic and oleophylic properties and high in oil-water mixture separation efficiency.

Description

Technical field [0001] The invention belongs to the technical field of membranes, in particular to a preparation method of graphene hybrid perfluoropolymer hollow fiber membranes for oil-water separation. Background technique [0002] In recent years, frequent marine oil spills and the development of petrochemical, daily chemical, textile, food and other industries have produced a large amount of oily wastewater, causing serious environmental pollution and ecological damage, and endangering human health and safety. Therefore, how to achieve effective treatment of oily wastewater, obtain clean water, and alleviate environmental and ecological problems has attracted worldwide attention. [0003] At present, the methods for separating oil-water mixtures in industry mainly use gravity separation, centrifugal separation, filtration and adsorption by using the difference in oil-water density, but these separation methods are low in efficiency and are prone to cause secondary pollution. ...

Claims

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Application Information

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IPC IPC(8): B01D71/32B01D71/02B01D69/08B01D69/02B01D67/00B01D17/022
CPCB01D17/02B01D67/0079B01D69/02B01D69/08B01D71/021B01D71/32B01D2325/38
Inventor 肖长发潘金峰张泰赵健封严
Owner TIANJIN POLYTECHNIC UNIV
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