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Graphene modified sodium alginate-polyacrylonitrile heterogeneous enhanced type hollow fiber membrane

A graphene modification and sodium alginate technology, applied in the field of hollow fiber membranes, can solve the problems of indeterminate pore size of braided tubes, poor filtration performance, and insufficient uniformity, and achieve improved mechanical properties, excellent hydrophilicity, and improved mechanical strength. Effect

Inactive Publication Date: 2017-05-17
QINGDAO HANXING INTPROP OPERATIONS MANAGEMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The braided rope is often used to strengthen the membrane body during membrane preparation, such as using an ultra-fine fiber braided tube, coating it with a casting solution, and then solidifying it in a coagulation bath to obtain a reinforced hollow fiber membrane, thereby improving the mechanical properties of the membrane. However, the pore size of the braided tube is not fixed and uniform enough, which has a bad influence on the filtration performance of the membrane.

Method used

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  • Graphene modified sodium alginate-polyacrylonitrile heterogeneous enhanced type hollow fiber membrane

Examples

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Effect test

Embodiment 1

[0019] Preparation of reinforcement base membrane: Disperse a certain proportion of PVDF in the solvent DMAC, stir at a constant temperature at 70°C until the polymer is completely dissolved, stand for defoaming, and prepare polyvinylidene fluoride hollow fiber membrane by melt spinning method, and The membrane is used as the base membrane of the graphene-modified sodium alginate-polyacrylonitrile heterogeneously reinforced hollow fiber membrane.

[0020] Preparation of the casting solution: prepare raw materials of the following quality: 30 g of polyacrylonitrile, 10 g of graphene, 20 g of sodium alginate, 40 g of dimethylformamide, and 50 g of ethylene glycol.

[0021] Dissolve polyacrylonitrile with a molecular weight of 32,000 in dimethylformamide solution to prepare spinning stock solution 1, mix graphene with sodium alginate, dissolve it in ethylene glycol solution, and let it stand at room temperature for 2 hours to prepare Spinning stock solution 2, slowly inject spinn...

Embodiment 2

[0024] Preparation of reinforcement base membrane: Disperse a certain proportion of PVDF in the solvent DMAC, stir at a constant temperature at 70°C until the polymer is completely dissolved, stand for defoaming, and prepare polyvinylidene fluoride hollow fiber membrane by melt spinning method, and The membrane is used as the base membrane of the graphene-modified sodium alginate-polyacrylonitrile heterogeneously reinforced hollow fiber membrane.

[0025] Preparation of the casting solution: prepare the following raw materials: 20 g of polyacrylonitrile, 5 g of graphene, 15 g of sodium alginate, 35 g of dimethyl sulfoxide, and 45 g of isopropanol.

[0026] Dissolve polyacrylonitrile with a molecular weight of 42,000 in dimethyl sulfoxide solution to prepare spinning stock solution 1, mix graphene and sodium alginate, dissolve in isopropanol solution, and let it stand at room temperature for 1.5 hours to prepare Spinning stock solution 2, slowly inject spinning stock solution 2...

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Abstract

The invention provides a graphene modified sodium alginate-polyacrylonitrile heterogeneous enhanced type hollow fiber membrane, particularly relates to a graphene modified sodium alginate-polyacrylonitrile hollow fiber membrane. The membrane is heterogeneously enhanced, the fiber breaking probability is reduced, the membrane can be used for membrane distillation with water and protein media and has higher vapor permeability, excellent separation property, better protein filtration flux and water impermeability under high pressure, and the mechanical property of the membrane is improved greatly. The tensile breaking strength and the selectivity of the membrane are improved greatly by modifying a sodium alginate layer with graphene and heterogeneously enhancing the membrane.

Description

technical field [0001] The invention relates to a graphene-modified sodium alginate-polyacrylonitrile heterogeneously reinforced hollow fiber membrane. It specifically relates to a hollow fiber membrane that does not contain macropores and is mainly a mesh structure, which is heterogeneously reinforced by a polyacrylonitrile-based membrane and modified with a graphene sodium alginate layer, which greatly improves the tensile breaking strength of the membrane , and at the same time, the membrane has filtering properties for protein molecules. Background technique [0002] Hollow fiber membranes have been widely used in membrane distillation. Membrane distillation is a liquid separation technology that combines the traditional distillation process with membrane separation technology. The membrane distillation process is that the water molecules of the hot side liquid evaporate and vaporize, pass through the micropores of the hydrophobic membrane, and the non-volatile ions and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/44
CPCB01D71/44B01D67/0093
Inventor 刘全英赵芬芬高晓东
Owner QINGDAO HANXING INTPROP OPERATIONS MANAGEMENT CO LTD
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