Microporous filter membrane and preparation method thereof

A technology of microporous membranes and organic membranes, applied in chemical instruments and methods, membranes, ultrafiltration, etc., can solve the problems of undisclosed microporous membranes, achieve high anti-pollution ability, high specific surface area, high surface opening The effect of porosity

Active Publication Date: 2022-03-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing literature reports, it has not been disclosed that a microporous filter membrane with a specific structure has been prepared by a two-step air-induced method

Method used

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  • Microporous filter membrane and preparation method thereof
  • Microporous filter membrane and preparation method thereof
  • Microporous filter membrane and preparation method thereof

Examples

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preparation example Construction

[0032] The present invention at first provides a kind of preparation method of microporous filter membrane, and this method comprises:

[0033] Step 1: Mix the polymer, thickener and solvent, stir at 50-100°C for 1-12 hours to dissolve, then add the porogen and stir, the temperature is preferably 80°C, and the stirring time is preferably 0.5-5h , cooled to room temperature, vacuum defoaming, the defoaming time is preferably 0.5-3h, and after standing, the casting solution of the polymer organic film is obtained; the standing time is preferably 1-24h;

[0034] The polymer is preferably selected from one or more of polysulfone, polyarylethersulfone, polyolefins, polyetherketone, polyimide sulfonated polysulfone, sulfonated polyethersulfone and polyetherimide kind;

[0035] The solvent is preferably selected from one or more of dimethylformamide, dimethylacetamide, N-methylpyrrolidone, caprolactam, and 1,4-dioxane;

[0036] The thickener is preferably selected from one or more ...

Embodiment 1

[0044] Example 1 Preparation of "hourglass" structure polyethersulfone microporous membrane with high specific surface area

[0045] According to the mass ratio of polyethersulfone resin (PES): polyvinylpyrrolidone: diethylene glycol: dimethylformamide = 15:10:45:30, add PES, polyvinylpyrrolidone, dimethylformamide to the melting pot Diethylene glycol was added into the porogen after stirring at 80°C for 4 hours, and the stirring was continued for 1 hour to prepare a stable and uniform viscous solution. The temperature was lowered to 25°C for 1 hour of defoaming, and then stood still for 8 hours to obtain a feed solution.

[0046] Scrape the feed liquid with a constant feed temperature of 25°C on a stainless steel strip or polypropylene resin with a 350 μm thick scraper, place it in humid air with a temperature of 25°C and a relative humidity of 60% for 10 seconds, and then place it at a temperature of 35 ℃, relative humidity of 70% in an air bath for 20s, then immersed in 50℃...

Embodiment 2

[0053] Prepare the solution according to the formula in Example 1, scrape the feed liquid with a constant feed liquid temperature of 25°C on the stainless steel strip or polypropylene resin with a 350 μm thickness scraper, and place it in a wet room with a temperature of 25°C and a relative humidity of 50%. In the air for 10s, then placed in an air bath with a temperature of 30°C and a relative humidity of 70% for 25s, then immersed in 50°C coagulation bath water for 8 minutes, and dried at 100°C, the measured bubble point pressure of water was 400Kpa-420KPa, and the pore size was 0.2μm, the measured pure water flux at 25°C is 28cc·min -1 cm -2 @70Kpa. The membrane has a structure with a high specific surface area and a separation layer between the upper and lower surfaces. Bovine serum albumin adsorption was 0.4% (bovine serum albumin solution 1.6 μg / 5ml water).

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Abstract

The invention provides a microporous filter membrane and a preparation method thereof, and belongs to the technical field of microporous filter membranes. The method comprises the following steps: mixing a polymer, a thickening agent and a solvent, stirring at 50-100 DEG C for 1-12 hours for dissolving, adding a pore-foaming agent, stirring, cooling to room temperature, carrying out vacuum defoaming, and standing to obtain a membrane casting solution of a high-molecular organic membrane; scraping the membrane casting solution into a nascent state membrane, and staying in a first air bath; then entering a second air bath and staying; finally, the organic membrane is placed in a gel bath for curing and solvent exchange, and the microporous filter membrane is obtained. By adjusting the surface structure, the prepared microporous filter membrane has a relatively high specific surface area, the hydrophilicity and the anti-pollution capacity of the filter membrane are improved, and meanwhile, the microporous filter membrane has a hourglass-shaped structure, so that the assimilative capacity and the mechanical damage resistance of the filter membrane can be improved.

Description

technical field [0001] The invention belongs to the technical field of microporous membranes, and in particular relates to a microporous membrane and a preparation method thereof. Background technique [0002] Due to the superior performance of the membrane separation technology itself, the membrane separation process has received widespread attention from all over the world, and has been widely used in petroleum, chemical, pharmaceutical, chemical, electronic energy and other fields. With the gradual improvement of membrane technology, it has gradually replaced or improved traditional separation and purification processes. The core of the membrane separation process is the membrane with separation ability. The separation membrane is divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane according to the pore size. [0003] According to the types of materials, microfiltration membranes can be divided into two ca...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D71/68B01D69/12B01D69/06B01D69/08
CPCB01D61/147B01D67/0013B01D71/68B01D69/12B01D69/06B01D69/08B01D2325/24Y02E60/10
Inventor 李永纲李胜海张所波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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