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Asymmetric hydrophilic/hydrophobic composite fiber membrane and preparation method thereof

A technology of composite fiber membrane and hydrophobic polymer, which is applied in the fields of fiber processing, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problem that the amphoteric properties cannot be maintained for a long time, it is difficult to form a large-area membrane, and the mechanical strength of the amphoteric membrane is low. and other problems, to achieve the effect of good water collection performance, strong tolerance, fast and effective water collection

Active Publication Date: 2022-05-10
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing amphoteric membranes have many problems such as complex preparation process, difficulty in forming large-area membranes, high manufacturing costs, low mechanical strength of the obtained amphoteric membranes, and inability to maintain amphoteric properties for a long time.

Method used

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  • Asymmetric hydrophilic/hydrophobic composite fiber membrane and preparation method thereof
  • Asymmetric hydrophilic/hydrophobic composite fiber membrane and preparation method thereof
  • Asymmetric hydrophilic/hydrophobic composite fiber membrane and preparation method thereof

Examples

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preparation example Construction

[0053] In a preferred embodiment of the present invention, the preparation method specifically includes the following steps:

[0054] Step 1. Pretreat the metal mesh.

[0055] The metal mesh is selected from the metal mesh described in the first aspect of the present invention.

[0056] The pretreatment includes cutting, washing and drying.

[0057] After cutting the metal mesh to the desired size, put it in the cleaning solution for cleaning. In a preferred embodiment of the present invention, the metal mesh is sequentially put into acetone, absolute ethanol and deionized water for ultrasonic cleaning.

[0058] After washing, the metal mesh is dried. In the present invention, the drying method and drying equipment are not specifically limited, as long as the drying purpose can be achieved. For example, in an oven, dry at 50-80°C for 2-3h.

[0059] Step 2, oxidizing the pretreated metal mesh to obtain a metal mesh with a metal hydroxide layer.

[0060] The oxidation trea...

Embodiment 1

[0083] Weigh K 2 S 2 o 8 and NaOH dry powder, put them in two beakers respectively, add 100ml deionized water respectively, and obtain the NaOH solution with the concentration of 2.5mol / L and the K with the concentration of 0.1mol / L respectively 2 S 2 o 8 Solution, seal the beaker containing the solution with parafilm for later use.

[0084] Cut a number of copper meshes with a size of 4cm×4cm, clean the cut copper meshes with acetone, absolute ethanol and deionized water for several minutes in order to remove oil and other pollutants on the surface of the copper meshes, take them out and place them in Dry in an oven at 60°C for 2 hours and take it out for later use.

[0085] Place the pretreated copper mesh in a mixed solution of 2.5mol / L sodium hydroxide solution and 0.1mol / L potassium persulfate solution (the volume ratio of the two solutions is 1:1, stir until evenly mixed ), after the seal is intact, place it on a magnetic stirrer, and soak for a certain period of t...

Embodiment 2

[0090] Add poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (fluorosilane, F) to DMF (N,N-dimethyl A mixed solvent of formamide) and acetone (wherein the mass ratio of DMF to acetone is 7:3, and the mass ratio of PVDF-HFP to fluorosilane is 10:1), and the container containing the mixed solution is sealed with a parafilm. Stir vigorously at 40°C for 6 hours to completely dissolve the PVDF-HFP particles and form a transparent and uniform PVDF-HFP / F spinning solution.

[0091] Spinning solutions with mass fractions of PVDF-HFP of 15wt%, 17.5wt% and 20wt% were respectively prepared by the above method for use in subsequent experiments.

[0092] Draw 3mL of PVDF-HFP / F homogeneous solution with a plastic dropper, place it in a 5mL syringe, then select a spinneret with an inner diameter of 0.6mm, connect it to the high-voltage power supply of the spinning equipment, and perform electrospinning . During the spinning process, the...

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Abstract

The invention provides an asymmetric hydrophilic / hydrophobic composite fiber membrane which is characterized in that a hydrophilic metal net is arranged on one side of the composite fiber membrane, and a hydrophobic polymer fiber layer is arranged on the other side of the composite fiber membrane. The composite fiber membrane has different water collecting capacities from a hydrophobic side to a hydrophilic side and from the hydrophilic side to the hydrophobic side, and shows good directional water capturing capacity from the hydrophobic side to the hydrophilic side. The preparation method of the asymmetric hydrophilic / hydrophobic composite fiber membrane utilizes a simple surface oxidation method to construct the hydrophilic layer, the hydrophilic effect is good, the method is simple and easy to implement, the performance of the obtained hydrophilic layer is kept stable, and the hydrophobic layer is prepared by adopting a convenient and efficient electrostatic spinning technology and is mature and stable, so that the preparation method is easy to implement, and the preparation cost is low. The obtained composite fiber membrane is rapid and effective in water collection. The method can be widely applied to the fields of agriculture and water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and in particular relates to an asymmetric hydrophilic / hydrophobic amphiphilic membrane and a preparation method thereof, in particular to an asymmetric hydrophilic / hydrophobic fiber membrane composed of a metal mesh and a polymer. Background technique [0002] Water resources are severely depleted or heavily polluted due to the demands of rapid economic growth and poor management in large parts of the planet. As a global problem, the shortage of water resources has seriously affected the sustainable economic development and ecological security of countries all over the world. People are devoting themselves to the research of various water utilization and water treatment methods, such as secondary processing of wastewater, desalination of seawater, etc., but there are still disadvantages in the prior art that the process is complicated and the cost is high. In addition, the fog in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D71/32B01D71/02B01D69/12B01D69/02B01D67/00C02F1/44E03B3/28C23C8/12C23C22/60C25D11/02D01D5/00D01F1/10D01F6/48
CPCB01D71/06B01D71/32B01D71/022B01D69/12B01D69/02B01D67/0079C02F1/44E03B3/28D01F6/48D01F1/10D01D5/003D01D5/0084C23C8/12C23C22/60C25D11/02Y02A20/131
Inventor 吴晶任宝娜张秀芹
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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