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Composite fibrous membrane having hydrophobic/hydrophilic wettability difference and preparation method thereof

A composite fiber membrane, wettable technology, used in heating/cooling fabrics, textiles and papermaking, fabric surface trimming, etc., can solve the problem of failure to functional research, impermeability from hydrophilic side to hydrophobic side, and stability to be further Improve and other problems, to achieve the effect of efficient capture and collection capacity, simple preparation method and high efficiency

Active Publication Date: 2017-01-04
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2010, Ho Sum Lim et al. prepared a polyacrylonitrile fiber membrane with a difference in hydrophilicity and hydrophobicity by combining electrospinning and heat treatment, and realized the convenient preparation of a special wettable "double-faced god" fiber membrane, but it failed to Further research on its functionality (Langmuir, 2010, 26, 19159)
In 2010, Lin Tong's group impregnated polyethylene fabric in a titanium dioxide-containing sol, and irradiated the fabric membrane with ultraviolet light to make one side of the membrane hydrophobic and the other hydrophilic, realizing the one-way permeability of water droplets (J. Mater.Chem., 2010, 20, 7938), the fabric membrane prepared by this method successfully realized the one-way permeation of water driven by the wettability gradient for the first time (water permeates from the hydrophobic side to the hydrophilic side; The water side cannot pass through the hydrophobic side), but its stability needs to be further improved in practical applications

Method used

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  • Composite fibrous membrane having hydrophobic/hydrophilic wettability difference and preparation method thereof
  • Composite fibrous membrane having hydrophobic/hydrophilic wettability difference and preparation method thereof
  • Composite fibrous membrane having hydrophobic/hydrophilic wettability difference and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Heat and stir the analytically pure polymer polyacrylonitrile (PAN) at 60°C until it dissolves in N,N-dimethylformamide (DMF) solvent, and stir until the PAN is completely dissolved to obtain polyacrylonitrile Electrospinning solution A of N,N-dimethylformamide (PAN / DMF). The mass fraction of the obtained electrospinning solution A was 12.5 wt%.

[0025] (2) The electrospinning solution A is placed in the syringe of the electrospinning equipment, and a high-voltage electrostatic field is applied between the metal spinneret of the syringe and the drum receiving base, the high-voltage electrostatic field voltage is 10kV, and the diameter of the metal spinneret is 0.4mm, the rotating speed of the drum is 100r / min, and the receiving substrate A is aluminum foil. The preparation process is as figure 1 As shown, a drum electrospinning device was used. Adjust the distance between the metal spinneret and the receiving base of the drum to be 10 cm, and the applied high-vo...

Embodiment 2

[0031] (1) Heat and stir the analytically pure polymer polyacrylonitrile (PAN) at 100°C until it dissolves in N,N-dimethylformamide solvent, and stir fully until the polymer is completely dissolved to obtain polyacrylonitrile / N , Electrospinning solution A of N-dimethylformamide (PAN / DMF). The mass fraction of the obtained electrospinning solution A was 20 wt%.

[0032] (2) The above-mentioned PAN / DMF electrospinning solution A is placed in the syringe of the electrospinning equipment, and a high-voltage electrostatic field is applied between the metal spinneret of the syringe and the drum receiving substrate. The voltage of the high-voltage electrostatic field is 35kV, and the metal spinneret The diameter of the head is 1.8mm, the rotational speed of the drum is 2000r / min, and the receiving substrate A is aluminum foil. Adjust the distance between the metal spinneret and the receiving substrate of the drum to 30cm, and apply a high-voltage electrostatic field to make the PAN...

Embodiment 3

[0038] (1) Heat and stir the analytically pure polymer polyacrylonitrile (PAN) at 85°C until it dissolves in tetrahydrofuran (THF) solvent, and fully stir until PAN is completely dissolved to obtain polyacrylonitrile / tetrahydrofuran (PAN / THF) Electrospinning solution A. The mass fraction of the obtained electrospinning solution A was 17.5 wt%.

[0039] (2) Place the electrospinning solution A of the above-mentioned PAN / THF in the syringe of the electrospinning equipment, apply a high-voltage electrostatic field between the metal spinneret of the syringe and the receiving base of the drum, the voltage of the high-voltage electrostatic field is 20kV, and the metal spraying The diameter of the wire head is 0.8mm, the rotating speed of the drum is 1000r / min, and the receiving substrate A is aluminum foil. Adjust the distance between the metal spinneret and the receiving base of the drum to be 15 cm, and the applied high-voltage electrostatic field causes the PAN / THF electrospinni...

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Abstract

The invention discloses a composite fibrous membrane having hydrophobic / hydrophilic wettability difference and a preparation method thereof and belongs to the technical field of functional micro-nano composite fibrous materials. The composite fibrous membrane is provided with two fibrous membrane layers. Firstly, an electrostatic spinning solution A serves as a precursor solution to prepare the fibrous membrane PAN-I by adopting an electrostatic spinning method, a heat treatment method is combined to make the fibrous membrane PAN-I have hydrophobicity; then, an electrostatic spinning solution B serves as a precursor solution to prepare the fibrous membrane PAN-II, and then a receiving substrate is stripped to obtain the composite fibrous membrane. The preparation method is simple, low in energy consumption and high in efficiency. The fiber diameter of the composite fibrous membrane can be controlled by adjusting process parameters. Compared with simple hydrophobic or hydrophilic micro / nano fibrous membrane material, the composite fibrous membrane has efficient water drop capture and collection capability under the driving of hydrophobic / hydrophilic difference and can be used in the fields of water collection or mist collection from the air and the like.

Description

technical field [0001] The invention belongs to the technical field of functional micro-nano composite fiber materials, and in particular relates to a composite fiber membrane capable of efficiently trapping and collecting water droplets driven by special wettability differences and a preparation method thereof. Background technique [0002] Utilizing the difference in wettability (hydrophobic / hydrophilic) on the surface of materials to achieve efficient directional transport of liquids in the absence of external fields or external fields (such as force, heat, light, and electric fields) not only plays an important role in the field of liquid self-transport but also plays an important role in research such as It has application value in fields such as microfluidics, sewage treatment, and fog and water collection in the air. At present, there are relatively few preparations and studies on membranes with obvious differences in wettability or gradient membranes, but the design ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/43D04H1/728D06C7/00
CPCD04H1/43D04H1/728D06C7/00
Inventor 吴晶
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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