Polyacrylonitrile nanofiber porous membrane and preparation method thereof

A technology of polyacrylonitrile film and polyacrylonitrile, which is applied in the field of materials, can solve the problems of unsuitable polyolefin porous film preparation, high conductivity and viscosity requirements of spinning solution, etc., and achieve high porosity, good air permeability, The effect of simple process

Inactive Publication Date: 2019-04-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the electrospinning technology has high requirements on the conductivity and viscosity of the spinning solution, which is not suitable for the preparation of polyolefin porous membranes.
At present, although the polyacrylonitrile...

Method used

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  • Polyacrylonitrile nanofiber porous membrane and preparation method thereof
  • Polyacrylonitrile nanofiber porous membrane and preparation method thereof

Examples

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preparation example Construction

[0024] The invention provides a method for preparing a polyacrylonitrile nanofiber porous membrane, comprising the following steps:

[0025] A) mixing polyacrylonitrile, a solvent and an additive, heating and dissolving, and obtaining a mixed solution after defoaming;

[0026] Quick-freezing and desolventizing the mixed solution after scraping the film to obtain a polyacrylonitrile film;

[0027] B) Biaxially stretching the polyacrylonitrile film and heat setting to obtain a polyacrylonitrile nanofiber porous film.

[0028] The present invention at first prepares mixed solution, and concrete method is:

[0029] The polyacrylonitrile, solvent and additive are mixed, heated and dissolved, and a mixed solution is obtained after defoaming.

[0030] Wherein, the weight average molecular weight of the polyacrylonitrile raw material is 100,000-1 million, preferably 200,000-800,000, more preferably 400,000-600,000; the solvent is selected from polar aprotic solvents, and the polar ...

Embodiment 1

[0050] Example 1 Synchronous Biaxial Stretching to Prepare Polyacrylonitrile Nanofiber Porous Membrane

[0051] (1) Preparation of film-forming solution: mix polyacrylonitrile raw material with solvent dimethyl sulfoxide and additive water at a ratio of 1:8:1, magnetically stir at room temperature for 15 minutes until uniformly mixed, heat and swell at 60°C for 3 hours, Heat and dissolve at 80°C for 3 hours, and magnetically stir for 15 minutes every half hour during this period. After the dissolution is completed, vacuum defoam at 80°C for 12 hours to obtain a homogeneous film-forming solution for use.

[0052] (2) Wiping film: use a film scraping machine to scrape the film on the substrate, the scraping film speed is 2mm / s, the scraping film temperature is 75°C, the scraping film thickness is 800μm, and the scraping film substrate is a stainless steel plate.

[0053] (3) Freezing: After scraping the film, the stainless steel plate was quickly transferred to the freezing plat...

Embodiment 2

[0058] Example 2: Preparation of polyacrylonitrile nanofiber porous membrane by asynchronous biaxial stretching

[0059] (1) Preparation of film-forming solution: mix polyacrylonitrile raw material with solvent dimethyl sulfoxide and additive water at a ratio of 1:8:1 at room temperature for 15 minutes until uniformly mixed, heat and swell at 60°C for 3 hours, and then swell at 80°C Heat to dissolve for 3 hours, and magnetically stir for 15 minutes every half hour during this period. After the dissolution is completed, vacuum defoam at 80°C for 12 hours to obtain a homogeneous film-forming solution for use.

[0060] (2) Wiping film: use a film scraping machine to scrape the film on the substrate, the scraping film speed is 2mm / s, the scraping film temperature is 75°C, the scraping film thickness is 800μm, and the scraping film substrate is a stainless steel plate.

[0061] (3) Freezing: After scraping the film, the stainless steel plate was quickly transferred to the freezing ...

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Abstract

The invention provides a preparation method of a polyacrylonitrile nanofiber porous membrane. The preparation method of the polyacrylonitrile nanofiber porous membrane achieves preparation of the polyacrylonitrile membrane through a simple scraping method, during which quick freezing serves as a determining factor for preparing high-density and low-porosity casting pieces; high degree of supercooling can induce rapid phase separation and gelation of a film casting liquor system; lower-temperature freezing can rapidly cure a structure produced by phase separation and gelation of the film casting liquor system to avoid growth of large pores and finally to obtain the high-density and low-porosity casting pieces; lastly, the production and tensile pore expanding mechanism of biaxially orientedinduced fiber can help form a polyacrylonitrile nanofiber membrane structure. The preparation method of the polyacrylonitrile nanofiber porous membrane is simple in process and applicable to industrialization; the prepared polyacrylonitrile nanofiber porous membrane is high in porosity and good in breathability.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a polyacrylonitrile nanofiber porous membrane and a preparation method thereof. Background technique [0002] Porous membranes and corresponding membrane separation technologies, including microfiltration, ultrafiltration, electrodialysis, reverse osmosis, etc., have been widely used in food, medical and health, biotechnology, chemical and environmental fields, and are playing an increasingly important role. Nanofiber porous membrane is a new type of porous membrane material, which has the advantages of high specific surface area and porosity, large pore size, good air permeability, and rich sources of raw materials. It is used in water treatment, seawater desalination, drug purification, It is widely used in fields such as building protective film and outdoor protective clothing. Due to the high porosity, low curvature factor and controllable pore size of the nano...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D67/00B01D69/02
CPCB01D67/0002B01D69/02B01D71/42B01D2325/02
Inventor 李良彬陈鑫孟令蒲王道亮陈威
Owner UNIV OF SCI & TECH OF CHINA
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