Hydrophilic single-layer porous membrane as well as preparation method and application thereof

A porous membrane and hydrophilic technology, applied in the field of functional material preparation, can solve problems such as complex preparation and adjustment process, instability, easy layering mechanical properties, etc.

Active Publication Date: 2020-04-14
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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...

Method used

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  • Hydrophilic single-layer porous membrane as well as preparation method and application thereof
  • Hydrophilic single-layer porous membrane as well as preparation method and application thereof
  • Hydrophilic single-layer porous membrane as well as preparation method and application thereof

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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 as well as a preparation method and application thereof, and belongs to the technical field of functional material preparation. The hydrophilic single-layer polymer porous membrane is finally prepared by preparing a membrane casting solution, scraping the membrane and utilizing a phase inversion method in sequence; by changing theinitial concentration of the membrane casting solution, the thickness of membrane scraping, the composition of a phase inversion solvent and the proportion of a mixed phase inversion solvent, asymmetric micro-nano holes with different pore sizes are controlled to be prepared in the opposite surfaces of the single-layer polymeric membrane, so that intelligent control on different permeation statesof the liquid is realized. The preparation method of the hydrophilic single-layer porous membrane disclosed by the invention is simple and feasible; the thickness, porosity and pore size of the prepared porous membrane are easy to control, and the porous membrane is low in cost, environment-friendly, safe, reliable and easy for industrial large-scale production, and can be well applied to the fields of liquid one-way permeation, dressings or functional textiles for quickly drying wounds and directional transportation.

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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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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