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A kind of hydrophilic monolayer porous film and its preparation method and application

A porous membrane, hydrophilic technology, applied in the field of functional material preparation, can solve the problems of instability, difficulty, easy delamination of mechanical properties, etc.

Active Publication Date: 2022-02-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, although people are accustomed to applying the combination of multi-layer fabrics to achieve the asymmetry of structure and wettability, and then realize the one-way permeation of liquid, the multi-layer structure of porous materials also leads to complicated preparation and adjustment processes and in the environment. Instability, easy delamination and poor mechanical properties
And the liquid penetrates from the hydrophobic side to the hydrophilic side, and the required initial driving pressure is relatively large
At the same time, in a hydrophilic environment, it is difficult to control the direction of the liquid with hydrophilic porous materials because the liquid flow is often bidirectional.
Therefore, how to design and prepare a hydrophilic single-layer porous membrane to realize the directional permeation of liquid is still a great challenge.

Method used

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  • A kind of hydrophilic monolayer porous film and its preparation method and application
  • A kind of hydrophilic monolayer porous film and its preparation method and application
  • A kind of hydrophilic monolayer porous film and its preparation method and application

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preparation example Construction

[0039]A method for preparing a hydrophilic single-layer porous membrane with an asymmetric pore size, the method specifically includes the following steps:

[0040] (1) Mix the macromolecule with the surfactant and the solvent in the ratio of (1~3):(1~2):(1~6), wherein the surfactant is preferably PVP (polyvinylpyrrolidone), CTAB (hexadecyl Alkyltrimethylammonium bromide) or SDS (sodium dodecyl sulfate), the solvent is preferably DMAC (dimethylacetamide) or THF (tetrahydrofuran), stirring at (50°C-100°C) for 3-24h, A homogeneous polymer solution was obtained.

[0041] (2) Scrape the film with different thicknesses (1 μm to 200 μm) on a clean glass plate with a scraper, and immediately immerse the glass slices with polymer films of different thicknesses in different phase inversion solvents. The phase inversion solvents are preferably methanol, ethanol, Propanol, water, toluene, acetone, sodium chloride solution and mixed solvents mixed in different proportions, etc. For exam...

Embodiment 1

[0047] Preparation method and permeability performance of a kind of hydrophilic monolayer porous membrane

[0048] (1) Preparation of casting solution: Stir and mix polysulfone polymer particles, PVP and DMF at a ratio of 3:1:6 to obtain polysulfone casting solution;

[0049] (2) Scraping film: use a scraper to scrape and coat the polysulfone casting solution prepared in step (1) on a glass plate, and control the thickness of the scraping film by adjusting the height of the scraper to obtain a polysulfone film of 100 μm;

[0050] (3) Preparation of a hydrophilic single-layer porous membrane: a glass plate loaded with polysulfone is immersed in a phase inversion solvent for a predetermined time, followed by ultrasonic cleaning and drying to obtain a hydrophilic single-layer polysulfone porous membrane.

[0051] (4) By studying the permeability of water droplets, the permeability of both sides can be obtained.

Embodiment 2

[0053] Preparation method and permeability performance of a kind of hydrophilic monolayer porous membrane

[0054] (1) Preparation of casting solution: Stir and mix polyethersulfone polymer particles, PVP and DMF at a ratio of 3:1:6 to obtain polyethersulfone casting solution;

[0055] (2) Scraping film: use a scraper to scrape the polyethersulfone membrane solution prepared in step (1) on a glass plate, and control the thickness of the scraping film by adjusting the height of the scraper to obtain a series of polystyrene films with different thicknesses ;

[0056] (3) Preparation of a hydrophilic single-layer porous membrane: the glass plate carrying the polyethersulfone membrane is immersed in a phase inversion solvent for a predetermined time, followed by ultrasonic cleaning and drying to obtain a hydrophilic single-layer polyethersulfone porous membrane.

[0057] (4) Through the study of the permeability of its water droplets, different permeability properties can be obta...

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Abstract

The invention discloses a hydrophilic single-layer porous membrane, a preparation method and application thereof, and belongs to the technical field of functional material preparation. The present invention finally prepares a hydrophilic single-layer polymer porous membrane by preparing the casting solution, scraping the membrane and utilizing the phase inversion method in sequence, and changes the initial concentration of the casting solution, the thickness of the scraping membrane, the composition of the phase inversion solvent and The ratio of the mixed phase inversion solvent is used to control the preparation of asymmetric micro-nano holes with different pore sizes on the opposite surface of the single-layer polymer membrane, so as to realize the intelligent control of different permeation states of the liquid. The preparation method of the hydrophilic single-layer porous membrane disclosed by the invention is simple and easy, and the thickness, membrane porosity and membrane pore size of the prepared porous membrane are easy to control, and the cost is low, the environment is friendly, safe and reliable, and it is easy to produce on an industrial scale , can be well applied in liquid one-way permeation, quick-drying wound dressings or functional textiles and directional transport fields.

Description

technical field [0001] The invention relates to the technical field of preparation of functional materials, in particular to a hydrophilic single-layer porous membrane and its preparation method and application, especially to the preparation of a single-layer porous membrane with an asymmetric surface pore size and the application of the porous membrane to a liquid monolayer Dressings or functional textiles for penetrating, fast-drying wounds, and directional transportation. Background technique [0002] Directed permeation of liquids, that is, liquids can permeate from one surface of the membrane to another surface, but the reverse direction is blocked, which is in intelligent liquid manipulation, designing advanced liquid delivery systems, rapidly drying wound dressings, functional textiles and chip microfluidics played an irreplaceable role. Researchers have densely packed porous structures with different pore sizes and opposite wettability, and multilayers into membrane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L81/06C08L33/12C08L25/06C08J9/28C08J5/18B01D69/02B01D67/00A61L15/26A61L15/24A61L15/42
CPCC08J9/286C08J5/18B01D69/02B01D67/0002A61L15/26A61L15/24A61L15/42A61L15/425B01D2325/36C08J2201/0502C08J2381/06C08J2333/12C08J2325/06C08J2205/042C08J2205/044C08L81/06C08L33/12C08L25/06
Inventor 田东亮张秋雅
Owner BEIHANG UNIV
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