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Reinforced graphene modified PVDF hollow fiber membrane and production method thereof

A technology of graphene modification and fiber membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems of poor mechanical strength, easy to break, and brittle membrane filaments, and improve the sewage treatment effect , Improve anti-pollution performance, improve the effect of tensile strength

Inactive Publication Date: 2017-11-17
UNITED ENVIRONMENT TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of the hollow fiber membranes prepared by the solution phase inversion method is poor, and the membranes will become brittle and deteriorate during chemical cleaning, especially in the alkaline cleaning solution; 4-5 times that of the membrane filaments prepared by the phase inversion method, the chemical resistance is also high, but it is easy to cause the membrane filaments to be brittle and easy to break
Currently, graphene-modified PVDF hollow fiber membranes with high strength, catalytic and antibacterial properties are rarely reported.

Method used

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  • Reinforced graphene modified PVDF hollow fiber membrane and production method thereof
  • Reinforced graphene modified PVDF hollow fiber membrane and production method thereof
  • Reinforced graphene modified PVDF hollow fiber membrane and production method thereof

Examples

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preparation example Construction

[0021] A kind of preparation method of reinforced graphene modified PVDF hollow fiber membrane, its specific steps are:

[0022] In order to effectively disperse graphene in polyvinylidene fluoride and to reduce costs, firstly, 0.02-1% graphene and 0.5-5% graphite powder are pre-mixed and microwave-dried, and then 0.2-0.5 % composite coupling agent and 10-35% polyvinylidene fluoride for high-speed mixing;

[0023] Add 2 to 28% of hydrophilic agent, 5 to 25% of pore forming agent and 35 to 70% of solvent to the ingredients after high-speed mixing, and mix again to make a film-making material; use high-temperature solvent phase inversion The graphene-modified PVDF hollow fiber membrane reinforced by the hook-woven mesh tube is prepared with the hook-woven mesh tube lamination process (temperature is 120-150°C); in this way, the graphene can be effectively and evenly dispersed in the polyvinylidene fluoride, It will not cause graphene to agglomerate and fail or reduce its effect...

Embodiment 1

[0033] Pre-mix 0.3% graphene and 3% graphite powder and then microwave dry, then add 0.3% composite coupling agent and 26.4% polyvinylidene fluoride for high-speed mixing; Add 20% hydrophilic agent, 15% pore-forming agent and 35% solvent, and mix again to make a film-making material; filter the film-making material into the spinning tank for defoaming, and control the defoaming temperature to 120°C ; Then pressurize the hollow fiber membrane composite die mouth and the hook-woven mesh tube to be combined and then separated and shaped by the solidification water tank to complete the preparation of the graphene-modified PVDF hollow fiber membrane reinforced by the hook-woven mesh tube.

[0034] The outer diameter of the hollow fiber membrane obtained in this example is 1.9 mm, the inner diameter is 0.9 mm, the porosity is 61%, and the membrane separation pore diameter is 0.08 micron, under the test conditions of 0.1 MPa and 25 ° C (detection reference standard: People's Republic ...

Embodiment 2

[0036] Pre-mix 1% graphene and 2% graphite powder and then microwave dry, then add 0.2% composite coupling agent and 35% polyvinylidene fluoride for high-speed mixing; Add 5% hydrophilic agent, 10% pore forming agent and 46.8% solvent, and mix again to make film-making material; filter the film-making material into the spinning tank for defoaming, and control the defoaming temperature to 150°C ; Then pressurize the hollow fiber membrane composite die mouth and the hook-woven mesh tube to be combined and then separated and shaped by the solidification water tank to complete the preparation of the graphene-modified PVDF hollow fiber membrane reinforced by the hook-woven mesh tube.

[0037] The hollow fiber membrane obtained in this example has an outer diameter of 1.9mm, an inner diameter of 0.9mm, a porosity of 68%, a membrane separation pore diameter of 0.1 micron, and a pure water flow rate of 850L under the test conditions of 0.1MPa and 25°C. / m 2 *hr; In the normal operati...

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Abstract

The invention discloses a reinforced graphene modified PVDF hollow fiber membrane and a production method thereof. The fiber membrane comprises, by mass, 10-35% of polyvinylidene fluoride, 0.02-1% of graphene, 0.5-5% of graphite powder, 0.2-0.5% of a composite coupling agent, 2-28% of a hydrophilic agent, 35-70% of a solvent and 5-25% of a pore forming agent. The whole production method of the fiber membrane comprises the following steps: the graphene and the graphite powder are pre-mixed and undergo microwave drying; the composite coupling agent and the polyvinylidene fluoride are added, and high-speed mixing is carried out; other raw materials are added to make a membrane producing material; and the membrane producing material is filtered, and the filtered membrane producing material is transferred into a spinning tank, and undergoes a high-temperature solvent phase conversion technology and a membrane laminating technology to produce the membrane product. The hollow fiber membrane produced in the invention has catalysis and antibiosis functions, and can accelerate the oxidative degradation of pollutants and prevent bacteria from breeding on the surface of the membrane in the sewage treatment process, so the anti-pollution performance and the sewage treatment effect of the membrane are improved; and crocheted network tubes are adopted to carry out reinforcement, so the tensile strength of the hollow fiber membrane is greatly improved, and filament fraction is avoided.

Description

technical field [0001] The invention relates to a hollow fiber membrane and a preparation method thereof, in particular to a reinforced graphene-modified PVDF hollow fiber membrane and a preparation method thereof, and belongs to the field of membrane technology. Background technique [0002] Hollow fiber membranes can be widely used for filtration or separation in various fields such as industrial and municipal sewage treatment, drinking water purification, reclaimed water reuse, food processing, biomedicine, and gas separation. Polyvinylidene fluoride (PVDF) is an emerging membrane material with excellent comprehensive performance. It has high mechanical strength, acid and alkali resistance and other harsh environmental conditions and good chemical stability. It has the characteristics of high separation precision and high efficiency. The field of separation has broad application prospects. At present, the preparation methods of polyvinylidene fluoride hollow fiber membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34B01D67/00
CPCB01D69/08B01D67/0002B01D71/021B01D71/34
Inventor 洪建春吴仕伟
Owner UNITED ENVIRONMENT TECH XIAMEN
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