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Asymmetric wettability composite membrane and preparation method thereof

A composite membrane and wettability technology, applied in the field of asymmetric composite membranes and their preparation, can solve the problem that the unidirectional water conductivity still needs to be improved, and achieve the effects of excellent moisture permeability, excellent thermal conductivity, and ensuring thermal comfort in wearing

Pending Publication Date: 2022-05-06
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Other invention patents related to this, such as CN102605554A discloses a preparation method of superhydrophobic and superhydrophilic electrospun nanofiber composite membrane, CN102691175A discloses a composite fiber membrane with unidirectional water permeability and its preparation method, CN105664730A discloses a composite membrane capable of regulating the one-way permeation range of liquid and its preparation method, etc. It is obvious that its one-way water-conducting performance still needs to be improved

Method used

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  • Asymmetric wettability composite membrane and preparation method thereof
  • Asymmetric wettability composite membrane and preparation method thereof
  • Asymmetric wettability composite membrane and preparation method thereof

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preparation example Construction

[0059] The preparation method of the asymmetric wettable composite membrane is described in detail below.

[0060] Step 1, preparing a hydrophilic polymer base layer.

[0061] In step 1, the hydrophilic polymer fabric is alkali-treated to obtain a hydrophilic polymer base layer.

[0062] In step 1, the hydrophilic polymer fabric is selected from polysulfone fabric, polyamide fabric, polyamic acid fabric, polyimide fabric, polyurethane fabric, polyacrylic acid fabric, polylactic acid fabric, polyethylene oxide fabric And any one or more in the polyvinylpyrrolidone fabric, preferably polylactic acid fabric, such as the polylactic acid fabric produced by Puyang Yurun New Material Co., Ltd., wherein 50wt% polylactic acid, 18wt% acetic acid and 32wt% Tencel.

[0063] Among them, the choice of hydrophilic polymer fabric has a direct impact on the hydrophilicity of the asymmetric wettable composite membrane, and green and environmental protection are also considerations. Represente...

Embodiment 1

[0108] (1) Polylactic acid fabric (abbreviated as PLA fabric, composed of 50wt% polylactic acid, 18wt% acetic acid and 32wt% tencel, produced by Puyang Yurun New Material Co., Ltd.) was cut into a square of 8cm × 8cm, and its Soak in a NaOH solution with a concentration of 10g / L for 3h, and then place the PLA fabric in a ventilated place to dry for 24h to prepare a hydrophilic polymer base layer, namely NaOH@PLA fabric.

[0109] (2) Weigh 1.5g of polylactic acid (PLA) particles (produced by Zhejiang Hisun Biomaterials Co., Ltd.) into a 25mL conical flask, then add 12.285g of mixed solvent (N,N-dimethylformamide: tetrahydrofuran =7:3(w / w)), to obtain a mixed solution with a PLA particle concentration of 10wt%, the Erlenmeyer flask was well sealed, and placed on a magnetic stirrer with a temperature of 40°C and a rotating speed of 400rmp for 3h until the PLA particles Completely dissolved to obtain the PLA spinning solution precursor.

[0110] (3) Lay the NaOH@PLA fabric prepar...

Embodiment 2

[0113] The PLA-NaOH@PLA composite film was prepared in a similar manner to Example 1, with the difference that: a 6G spinneret was used, and the thickness of the PLA-NaOH@PLA composite film was measured to be 256.6 μm.

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Abstract

The invention discloses an asymmetric composite membrane and a preparation method thereof. The asymmetric composite membrane comprises a hydrophilic polymer substrate layer and a hydrophobic polymer nanofiber layer. The composite membrane has a one-way water conveying capability, so that water can be conveyed from the hydrophobic polymer nanofiber layer to the hydrophilic polymer substrate layer, but reverse permeation cannot be realized; in addition, the fabric has good thermal conductivity, can ensure the wearing thermal comfort of clothes when being used for textiles, especially protective clothes, and provides a development thought for research work in the aspect of improving the thermal and wet comfort of the protective clothes.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and relates to an asymmetric composite membrane and a preparation method thereof. Background technique [0002] Biochemical pollution caused by sudden infectious diseases such as the COVID-19 novel coronavirus pneumonia raging around the world and chemical safety accidents poses a serious threat to national security, people's health and social stability. Disposable medical protective clothing has the advantages of good barrier protection and can greatly improve the protection ability. It has played a very important role in the prevention of pneumonia caused by the new coronavirus infection. However, the excellent moisture barrier performance will also make it difficult for the sweat and moisture produced by the human body to be excreted from the body, seriously affecting the thermal and moisture comfort of protective clothing. How to improve the sweat-wicking and moisture-wicking an...

Claims

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Application Information

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IPC IPC(8): B32B5/02B32B15/14B32B15/20D01D5/00
CPCB32B5/02B32B5/022B32B15/20B32B15/14D01D5/0084D01D5/003B32B2262/0276B32B2307/302B32B2307/7163B32B2307/726B32B2437/00D10B2401/12
Inventor 吴晶赵昕张秀芹
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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