Process for preparing co-mixed polyethersulfone platform complex film

A polyethersulfone and composite membrane technology, applied in the field of membrane separation, can solve the problems of low strength, high cost, and lack of membrane strength, and achieve the effects of energy saving, easy temperature, and easy industrialization

Inactive Publication Date: 2006-02-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For homogeneous PES membranes, laboratory research has been able to obtain high-throughput porous PES membranes. However, these processes are used in industrial production, and the cost will be high, and the porosity of the membranes also results in lower strength of the membranes.
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Method used

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  • Process for preparing co-mixed polyethersulfone platform complex film
  • Process for preparing co-mixed polyethersulfone platform complex film
  • Process for preparing co-mixed polyethersulfone platform complex film

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047] Example 1

[0048] The effect of polymer concentration on membrane structure and performance

[0049] The blended polyethersulfone (the mass ratio of PES and SPES is 4:1) / PVP / DMAc with the weight ratios of 10 / 5 / 87 and 13 / 5 / 822, respectively, was stirred and dissolved in the flask for 36 hours at about 45°C. The polymer is completely dissolved, and the solution remains clear; the above-mentioned membrane-making solution is filtered with a Buchner funnel, and then vacuum degassed, and it is allowed to stand for use. Install the polyester non-woven fabric on the composite film scraping machine, adjust the line speed controller to control the non-woven fabric's running speed to 1.5m / s; adjust the thickness of the knife edge between the scraper and the support layer to 150μm; the ambient temperature is 26℃ , Pour the film-making liquid with a temperature of 26℃ into the feed tank, and then scrape the film. The solution is applied to the support layer, run in air for 5s, and then...

Example Embodiment

[0053] Example 2

[0054] The influence of solvents on membrane structure and performance

[0055] The blended polyethersulfone with a mass ratio of 10 / 5 / 85 (the mass ratio of PES and SPES is 4:1) / PVP / solvent is fully stirred and dissolved in a flask at about 45° C. for 36 hours until the polymer is completely dissolved. Solvents are DMAc, NMP, DMF, DMSO. The subsequent wiped film process, water flux measurement and SEM characterization are the same as in Example 1. The thickness, average pore size and water flux of the prepared composite membrane are shown in Table 3.

[0056] Membrane number

Example Embodiment

[0057] Example 3

[0058] The influence of PVP content on membrane structure and performance

[0059] Blended polyethersulfone with mass ratios of 10 / 1 / 85, 10 / 3 / 87, 10 / 5 / 85, 10 / 7 / 83, 10 / 10 / 80 (the mass ratio of PES and SPES is 4:1) / PVP / / DMAc was stirred and dissolved in a flask at about 45°C for 40 hours until the polymer was completely dissolved. The subsequent wiped film process, water flux measurement and SEM characterization are the same as in Example 1. The contact angle is measured as follows. The composite film without glycerin water treatment is dried in an oven at 80°C for 4 hours at a constant temperature, and then the contact angle is measured on a contact angle meter by the lying drop method with tertiary distilled water. Each sample was measured 8 times and the average value was taken. The water flux, thickness and contact angle of the prepared composite membrane are shown in Table 4. The surface morphology of various membranes is attached image 3 .

[0060] ...

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Abstract

The invention discloses a method for preparing slab-shaped complex film made by blending polyethersulfone. Various film-forming agents according to certain proportion are made by blending polymer (polyethersulfone and sulfonated polyethersulfone), additive, non-solvent and organic solvent. Complex film is prepared on traditional shearing machine via pouring film-forming agents into loading chute, entering knife-edge groove, covering solution on supporting layer and dipping it into coagulating bath. The invention is characterized in that mainly via adjusting composition of film-forming agents, it prepares slab-shaped complex film with high intensity, high water flux and good hydrophilicity.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method of a blended polyethersulfone flat composite membrane with high flux, high mechanical strength and good hydrophilicity. Background technique [0002] Polyethersulfone (PES) is an engineering plastic with superior performance. Its glass transition temperature is as high as 225°C, and it has particularly excellent resistance to hot water and high temperature water vapor. Its structure will not be damaged in hot water and water vapor at 130-140°C, but deformation and performance degradation will occur only when the temperature is higher than 150°C. PES has excellent mechanical properties, excellent heat resistance, alkali resistance, pressure resistance, corrosion resistance and excellent blood compatibility, and is an excellent microporous membrane preparation material. This material can be dissolved in dimethyl sulfoxide, N,N-dimethylfo...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68
Inventor 徐又一左丹英朱宝库吴桂萍
Owner ZHEJIANG UNIV
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