Method for large-area preparation of hydrophobic/hydrophilic Janus composite fiber membrane with function of efficient catchment under drive of directional capillary force through electrostatic spinning

A composite fiber membrane, electrospinning technology, applied in electrospinning, fiber processing, filament/line forming and other directions, can solve problems such as restricting application and not yet reported, and achieve easy capture and absorption, low cost, high efficiency high effect

Inactive Publication Date: 2018-09-28
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, on the one hand, there are few researches on high-efficiency water-collecting membrane materials without external field effects and the exploration of large-area preparation methods, which greatly restricts its practical application.
On the other hand, the design and construction of the Janus (Double-faced God) porous membrane material composed of two layers of fiber membranes

Method used

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  • Method for large-area preparation of hydrophobic/hydrophilic Janus composite fiber membrane with function of efficient catchment under drive of directional capillary force through electrostatic spinning
  • Method for large-area preparation of hydrophobic/hydrophilic Janus composite fiber membrane with function of efficient catchment under drive of directional capillary force through electrostatic spinning
  • Method for large-area preparation of hydrophobic/hydrophilic Janus composite fiber membrane with function of efficient catchment under drive of directional capillary force through electrostatic spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The first step is to prepare precursor solution A: polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) solution:

[0042] Weigh a certain amount of PVDF-HFP of pure grade after vacuum drying, select N,N-dimethylformamide (DMF) as the organic solvent A, and prepare a DMF solution with a mass fraction of PVDF-HFP of 15wt%. At a heating temperature of 60°C, heat and stir until the polymer is completely dissolved, and then set aside for later use.

[0043] The second step, electrospinning to prepare hydrophobic PVDF-HFP electrospun membrane:

[0044] Select a non-woven fabric with the same width as the collecting drum as the receiving substrate A, and inject the PVDF-HFP / DMF precursor solution with a concentration of 15wt% configured in the first step into the syringe for electrospinning. Spinning device such as figure 1 As shown, it mainly includes a receiving drum 1, a metal spinneret 2, a high-voltage electrostatic positive and negative electrode 3, and a solution i...

Embodiment 2

[0052] The first step is to prepare electrospinning precursor solution A—polyvinylidene fluoride (PVDF) solution:

[0053] Weigh a certain amount of pure grade PVDF after vacuum drying, select N,N-dimethylformamide (DMF) and tetrahydrofuran (THF) as a mixed solvent with a mass ratio of 4:1, and configure DMF with a mass fraction of PVDF of 30wt% / THF solution. At a heating temperature of 80° C., heat and stir until the polymer is completely dissolved, and set aside for later use.

[0054] The second step, electrospinning to prepare hydrophobic PVDF electrospun membrane:

[0055] Select a non-woven fabric with the same width as the collecting drum as the receiving substrate A, and inject the PVDF / (DMF / THF) precursor solution with a concentration of 30wt% configured in the first step into the syringe for electrospinning.

[0056] Regulate the metal spinneret of injector and apply high-voltage electrostatic field between the drum receiving substrate A, the high-voltage electros...

Embodiment 3

[0063] The first step is to prepare the electrospinning precursor polystyrene (PS) solution:

[0064] Weigh a certain amount of PS that has been vacuum-dried and analytically pure, select N,N-dimethylformamide (DMF) as a solvent, and prepare a DMF solution with a mass fraction of 10 wt% PS. At a heating temperature of 25°C, heat and stir until the polymer is completely dissolved, and then set aside for later use.

[0065] The second step, electrospinning to prepare hydrophobic PS electrospun membrane:

[0066] A non-woven fabric with the same width as the collecting drum was selected as the receiving substrate, and the PS / DMF precursor solution with a concentration of 10 wt% prepared in the first step was injected into the syringe for electrospinning.

[0067] A high-voltage electrostatic field is applied between the metal spinneret of the injector and the receiving base of the drum. The high-voltage electrostatic field voltage is 35kV, the diameter of the metal spinneret is ...

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Abstract

The invention discloses a method for large-area preparation of a hydrophobic/hydrophilic Janus composite fiber membrane with a function of efficient catchment under drive of directional capillary force through electrostatic spinning and belongs to the technical field of functional fiber materials. A continuous winding device is taken as an electrospinning receiving substrate, a large-area Janus composite fiber membrane material with directional capillary function and hydrophobic/hydrophilic wettability difference is obtained by regulating and matching pore sizes forming two membranes of the hydrophobic/hydrophilic Janus composite fiber membrane and selecting different wettable polymer materials and is applied to collection and catchment of tiny water drops in the air. The preparation method is simple, low in energy consumption and high in efficiency and can realize stable large-area preparation. According to the prepared composite fiber membrane, tiny water drops are more easily caughtand absorbed when penetrating through a microporous hydrophilic layer from a microporous hydrophobic layer, so that the composite fiber membrane has higher tiny water drop collection capability thanfiber membranes with water drops penetrating from the microporous hydrophilic layer to the microporous hydrophobic layer as well as having a pure hydrophilic property and a pure hydrophobic property.

Description

technical field [0001] The invention belongs to the technical field of functional fiber materials, and specifically relates to the large-area preparation of a Janus composite water-collecting fiber membrane with directional capillary force and a difference in hydrophobic / hydrophilic wettability by means of an electrospinning method. Background technique [0002] Under the action of no external field (such as force, heat, light, electric field, etc.), the research, preparation and development of materials that can capture and collect tiny water droplets in the air in humid air have application value for the effective collection and reuse of water resources. At present, on the one hand, there are few researches on high-efficiency water-harvesting membrane materials without external field effects and the exploration of large-area preparation methods, which greatly restricts their practical application. On the other hand, the design and construction of the Janus (Double-faced Go...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4382D04H1/4374D01D5/00
CPCD01D5/003D01D5/0069D01D5/0084D01D5/0092D04H1/4374D04H1/4382D04H1/728
Inventor 吴晶张秀芹王锐皮浩弘
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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