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Preparation method of polysulfones flat ultrafiltration composite membrane

A technology of ultrafiltration composite membrane and polysulfone is applied in the field of preparation of polysulfone flat ultrafiltration composite membrane to achieve the effects of saving raw materials, improving mechanical strength and saving energy consumption

Active Publication Date: 2014-04-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly scrape-coat the casting solution on the non-woven fabric, and there is a problem with the fastness of the interface between the polymer coating layer and the non-woven fabric base support layer

Method used

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  • Preparation method of polysulfones flat ultrafiltration composite membrane
  • Preparation method of polysulfones flat ultrafiltration composite membrane
  • Preparation method of polysulfones flat ultrafiltration composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Dissolve 12% polysulfone, 8% polyvinylpyrrolidone in a container with a stirring device, wherein the ratio of K15 to K30 is 3:1, and 4% organic small molecule additive acetone to 76% by mass percentage Dimethylacetamide (DMAC) organic solvent, stirred and dissolved at 80°C for 24 hours, mixed thoroughly to make a uniform casting solution, filtered, vacuumed and degassed, and left to stand for use; 12 % polysulfone is fully dissolved in the organic solvent DMAC at 80°C, and the primary coating solution is obtained after filtration and defoaming. The distance between the scraper and the support layer is adjusted to control the thickness of the liquid film, and the primary coating solution Scrape coating on the support layer, after air exposure for 5 seconds, use the prepared casting solution to coat the non-woven support layer after the first coating and scrape the film. After the primary composite film is exposed in the air for 10 seconds, Immerse in coagulation bath wat...

Embodiment 2

[0057] By mass percent, 10% polysulfone, 10% polyvinylpyrrolidone, wherein the ratio of K15 to K30 is 1:3, 2% organic small molecule additive ethanol, are dissolved into 78% organic solvent N-methylpyrrolidone ( NMP), stirred and dissolved in a flask at 60°C for 36 hours, mixed thoroughly to make a uniform casting solution, filtered, vacuumed and degassed, and stood for use; 16% polysulfone was fully mixed at 60°C Dissolve in the organic solvent N-methylpyrrolidone, filter and defoam to obtain a primary coating solution, adjust the distance between the scraper and the support layer to control the thickness of the liquid film, and apply the primary coating solution to the support through a film scraping machine On the layer, after 30 seconds of air exposure, use the prepared casting solution to coat the non-woven support layer after the first coating and scrape the film. After the primary composite film runs in the air for 60 seconds, it is immersed in the temperature at A poly...

Embodiment 3

[0060] Dissolve 14% polysulfone, 7% polyvinylpyrrolidone K30, 6% organic small molecule additive acetone and 5% acetic acid in 68% N-methylpyrrolidone and dimethylacetamide (DMAC ) in a mixed organic solvent composed of 10% by mass of DMAC, stirred and dissolved in a flask at 70°C for 12 hours, mixed thoroughly to make a uniform casting solution, filtered, vacuumed and defoamed, and left to stand Stand-by; fully dissolve 10% polysulfone in the above mixed organic solvent at 80°C, filter and defoam to obtain a coating solution, adjust the distance between the scraper and the support layer to control the thickness of the liquid film, and scrape the film The machine scrapes and coats the primary coating solution on the support layer, and after air exposure for 5 seconds, uses the prepared casting solution to apply the secondary coating and scrape film to the non-woven support layer after the primary coating. After running for 5 seconds, immerse in coagulation bath water at 25-28°...

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Abstract

The invention discloses a preparation method of a polysulfones flat ultrafiltration composite membrane, which is characterized in that polysulfones is taken as a raw material, N-Methyl-2-pyrrolidinone, dimethyl acetamide or dimethyl formamide is taken as a solvent, hydrophilic macro-molecule polyvinylpyrrolidone and organic micromolecule are used for a compound additive, a secondary knifing and coating mode is employed for preparing the polysulfones flat ultrafiltration composite membrane on a non-woven fabrics supporting layer, wherein a membrane liquid comprises the following composition by mass percentage: 10-20% of polysulfones; 3-10% of polyvinylpyrrolidone, 2-15% of organic micromolecule and 55-85% of solvent. A coating liquid for first knifing is 5-16% of polysulfones dilute solution. The prepared polysulfones ultrafiltration flat composite membrane has the characteristics of stable performance, high mechanical strength, high water flux and good hydrophilcity.

Description

technical field [0001] The invention relates to the field of membrane preparation, in particular to a method for preparing a polysulfone flat ultrafiltration composite membrane. Background technique [0002] The membrane separation process has the characteristics of no phase change, energy saving, small size, and detachability. In today's energy shortage, resource shortage, and deteriorating ecological environment, the scientific and technological circles, industry circles and governments of all countries regard the membrane process as a twenty-one An extremely important and basic new technology required for industrial technological transformation and upgrading of industrial technology in the century, it has been widely used in energy and chemical industry, seawater desalination, waste water and waste gas treatment and other environmental protection fields. Flat ultrafiltration membrane has the characteristics of good mechanical stability, no broken wire, low operating cost,...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68B01D67/00
Inventor 杨丽杨永强奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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