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Membrane casting solution, ultrafiltration base membrane, preparation method of ultrafiltration base membrane, and separation membrane

A technology of ultrafiltration base membrane and casting membrane solution, which is applied in the field of separation membrane, can solve the problems that the ultrafiltration base membrane needs to be improved, and achieve the effect of long service life and strong anti-pollution

Inactive Publication Date: 2020-02-07
CHINA LUCKY FILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the ultrafiltration base membrane that currently constitutes the nanofiltration membrane still needs to be improved.

Method used

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  • Membrane casting solution, ultrafiltration base membrane, preparation method of ultrafiltration base membrane, and separation membrane
  • Membrane casting solution, ultrafiltration base membrane, preparation method of ultrafiltration base membrane, and separation membrane
  • Membrane casting solution, ultrafiltration base membrane, preparation method of ultrafiltration base membrane, and separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Ultrafiltration basement membrane preparation process:

[0078] (1) Preparation of casting solution: mix polysulfone, polyethylene glycol (molecular weight 4000), polyvinylpyrrolidone (K90), and dimethylacetamide in a mass ratio of 16:12:5:67, and Stir and dissolve in a water bath at 80°C to prepare a clear and transparent casting solution.

[0079] (2) Static defoaming: the static defoaming temperature is 60°C until there are no bubbles in the casting solution.

[0080] (3) Scratch coating: The humidity of the scraping coating environment is 30%, the temperature of the casting solution is 25°C, the gap between the scraper and the substrate is 0.12mm, the casting solution is poured on one side of the polyester non-woven fabric, and the speed of the scraper is controlled to be 100mm / s, the casting solution is evenly coated on the substrate, and after scraping, let it air in the air for 10s to form a nascent film.

[0081] (4) Coagulation bath: put the nascent membrane ...

Embodiment 2

[0086] The ultrafiltration base membrane preparation process of embodiment 2 is identical with embodiment 1, difference is, step (1) is: polysulfone, polyethylene glycol (molecular weight 4000), polyvinylpyrrolidone (K90), Dimethylacetamide was mixed according to the mass ratio of 17:5:3:75, and stirred and dissolved in a water bath at 80°C to prepare a clear and transparent casting solution.

[0087] Carry out scanning electron microscope test to the section of the ultrafiltration basement membrane that embodiment 2 obtains, refer to image 3 , the ultrafiltration basement membrane has both a finger-like pore structure and a sponge-like pore structure, and the ratio of the sponge-like pore structure to the finger-like pore structure is about 1:1.

[0088] Under the conditions of 25°C and 0.1MPa, the pure water flux of the ultrafiltration base membrane is 300L / (m 2 h), the retention rate of bovine serum albumin is 95%.

[0089] The pure water flux of the nanofiltration membr...

Embodiment 3

[0091] The ultrafiltration base membrane preparation process of embodiment 3 is the same as embodiment 1, and the difference is that step (1) is: polysulfone, polyethylene glycol (molecular weight 2000), sulfonated polysulfone, dimethylacetamide are pressed Mix at a mass ratio of 12:15:3:70, stir and dissolve in an 80°C water bath, and prepare a clear and transparent casting solution.

[0092] Carry out scanning electron microscope test to the section of the ultrafiltration basement membrane that embodiment 3 obtains, refer to Figure 4, the ultrafiltration basement membrane has both finger-like pore structure and sponge-like pore structure, and the finger-like pore structure is more than the sponge-like pore structure, and the ratio of the sponge-like pore structure to the finger-like pore structure is about 1:3.

[0093] Under the conditions of 25°C and 0.1MPa, the pure water flux of the ultrafiltration base membrane is 360L / (m 2 h), the retention rate of bovine serum album...

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Abstract

The invention discloses a membrane casting solution, an ultrafiltration base membrane, a preparation method of the ultrafiltration base membrane, and a separation membrane. The membrane casting solution is prepared from the components in percentage by mass: 12-25% of polysulfone, 5-15% of a first additive, 1-5% of a second additive and 55-80% of a solvent, wherein the molecular weight of the firstadditive is not larger than 5000, and the molecular weight of the second additive is not less than 10000. The ultrafiltration base membrane prepared through the membrane casting solution has a spongypore structure and a dactylopore structure simultaneously, so that the ultrafiltration base membrane has the advantages of low pressure, high throughput, high pollution resistance and long service life; by adjusting the content of the polysulfone, the first additive and the second additive in the membrane casting solution, the proportion of the dactylopore structure and the spongy pore structurein the ultrafiltration base membrane can be indirectly adjusted and controlled; and the ultrafiltration base membrane is prepared through the membrane casting solution, and thus the advantages of simple process, short production period, low cost and convenient industrial production are achieved.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a casting solution, an ultrafiltration base membrane, a preparation method, and a separation membrane. Background technique [0002] Membrane separation technology refers to the method of separating, fractionating, purifying and enriching the solute and solvent in the mixture by means of the selective osmosis of the membrane and driven by external energy or chemical potential difference. Compared with traditional separation methods, membrane separation technology has the advantages of high selectivity, low energy consumption, high separation efficiency and no secondary pollution. Membrane separation technology is mainly divided into four separation technologies: reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF), and microfiltration (MF). Separation and other fields have a wide range of applications and great potential for development. [0003] The nan...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D67/00B01D61/14
CPCB01D71/68B01D67/0013B01D67/0016B01D67/0011B01D61/145
Inventor 郭宇孟祥钦柳艳敏丁宇孙蒙蒙
Owner CHINA LUCKY FILM CORP