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A kind of high-efficiency high-throughput two-dimensional network ultrafine nanofiber oil-water separation material and its preparation method

A two-dimensional mesh, nanofiber technology, applied in separation methods, fiber treatment, liquid separation, etc., can solve the problems of easy shedding, reduced flux, short length of cellulose nanofibers, etc. The effect of high rate and wide application prospect

Inactive Publication Date: 2019-04-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cellulose nanofibers in the above method are short in length (<1 μm), easy to fall off and easy to block the pores of the material after falling off, resulting in a decrease in the porosity of the material and a decrease in flux, which is difficult to meet the requirements of practical applications.
Another published patent "A Preparation Method for Multi-component Net-like Nanofiber Membrane" (CN201410061970.2) reports the preparation of a net-like nano-spider web material with a fine diameter (5-35nm) and a small pore size (10-300nm). preparation method, but the nano-spider web material prepared by the above method contains a large number of conventional electrospun fiber scaffolds with relatively thick diameters, and the coverage rate of the network structure is low and discontinuous, resulting in a large number of gaps between the nets, so far it has not been possible to achieve its oil-water Separation of practical applications

Method used

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  • A kind of high-efficiency high-throughput two-dimensional network ultrafine nanofiber oil-water separation material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0024] A preparation method of high-efficiency and high-throughput two-dimensional network ultrafine nanofiber oil-water separation material:

[0025] 1) Sodium chloride is dissolved in N,N-dimethylacetamide, stirred by a magnetic stirrer for 10min, ultrasonically ultrasonicated for 30min, the content of sodium chloride is 0.0001twt% of the total mass of the polymer solution, and then the granular Ethylene-vinyl alcohol copolymer, molecular weight 2×10 7 , added to N,N-dimethylacetamide dissolved with sodium chloride, stirred for 2 hours under 60°C water bath conditions, to obtain a uniform and stable polymer solution, the mass concentration of ethylene-vinyl alcohol copolymer in the solution was 0.001wt %, the viscosity of the resulting solution is 1mPa·s.

[0026] 2) use figure 1In the device shown, the polymer solution obtained above is transported to the spinneret of the injection device 3 through the liquid supply system 2, the injection device is connected to a DC high...

Embodiment 2

[0028] A preparation method of high-efficiency and high-throughput two-dimensional network ultrafine nanofiber oil-water separation material:

[0029] 1) Sodium dodecylbenzenesulfonate is dissolved in a mixed solvent of N,N-dimethylformamide and acetone, the mass ratio of N,N-dimethylformamide and acetone is 3:2, magnetically stirred Stir for 90min with a sonicator, ultrasonically for 20min, the content of sodium dodecylbenzenesulfonate is 0.1wt% of the total mass of the polymer solution, and then the powdered polyvinylidene fluoride high polymer with a molecular weight of 5.0×10 5 , added to the mixed solvent of N, N-dimethylformamide and acetone dissolved with sodium dodecylbenzenesulfonate, and stirred at room temperature for 14 hours to obtain a uniform and stable polymer solution. Polyvinylidene fluoride in the solution The mass concentration is 1.5wt%, and the viscosity of the obtained solution is 350mPa·s.

[0030] 2) use figure 1 In the shown device, the polymer solu...

Embodiment 3

[0032] A preparation method of high-efficiency and high-throughput two-dimensional network ultrafine nanofiber oil-water separation material:

[0033] 1) Dissolve silver nitrate in tetrahydrofuran, stir with a magnetic stirrer for 20 minutes, and ultrasonically perform 20 minutes with an ultrasonic instrument. The content of silver nitrate is 0.002wt% of the total mass of the polymer solution, and then the granular polystyrene polymer with a molecular weight of 1.0 ×10 7 , added to the tetrahydrofuran solvent dissolved with silver nitrate, stirred at room temperature for 6 hours to obtain a uniform and stable polymer solution, the mass concentration of polystyrene in the solution was 0.01wt%, and the viscosity of the obtained solution was 80mPa·s.

[0034] 2) use figure 1 In the shown device, the polymer solution obtained above is transported to the spinneret of the injection device 3 through the liquid supply system 2. The injection device is connected to a DC high-voltage p...

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Abstract

The invention discloses a high-throughput efficient 2D net-shaped ultrafine nanofiber oil-water separation material and a preparation method thereof. The preparation method comprises the following steps: a polymer solution is prepared from a selected polymer, a net is formed through electrostatic direct injection of the polymer solution, a spinneret vibrates in situ by the aid of external force inan electrostatic direct injection process to promote generation of charged droplets, the droplets are subjected to phase separation, and a uniform 2D net-shaped ultrafine nanofiber material is formedon the surface of a receiving substrate and is in a continuous and seamlessly stacked shape; then the obtained material is subjected to surface modification, and the 2D net-shaped ultrafine nanofiberoil-water separation material with selective surface and interface wetting property is obtained. The preparation process is simple, raw material limitations are few, and the net-shaped ultrafine nanofiber oil-water separation material has tiny meshes and good pore channel connectivity and has great application prospect in the fields of oil purification, oil-containing wastewater treatment and thelike.

Description

technical field [0001] The invention relates to a high-efficiency and high-throughput oil-water separation material composed of two-dimensional network ultrafine nanofibers and a preparation method thereof, belonging to the technical field of functional nanofiber materials. Background technique [0002] At present, the separation of emulsified oil-water mixture has a wide range of application requirements in social production and daily life, involving petrochemical, transportation, food processing and many other industries. The existing sedimentation method, mechanical method, chemical method and other oil-water separation methods generally have the disadvantages of high energy consumption and low treatment efficiency. Membrane separation technology is more and more used in oil-water separation due to its advantages of low energy consumption and simple operation. However, the existing oil-water separation materials generally have the defect of large pore size, which leads to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/46D01F1/10D01F6/48D01F6/56D01F9/00D01F6/94D01F6/90D06M13/513D06M15/263D06M10/02D06M15/285B01D17/02C02F1/40
Inventor 丁彬刘惠张世超葛建龙张继超俞建勇
Owner DONGHUA UNIV
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