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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.
In fact, the film thickness is also a factor affecting the structure and performance of the membrane. The thinner the membrane, the more pores in the membrane and the greater the water flux. However, for a homogeneous membrane, if the membrane is too thin, the membrane will have no strength.

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

Embodiment 1

[0048] Effect of polymer concentration on membrane structure and performance

[0049] The blended polyethersulfone (PES and SPES mass ratio is 4:1) / PVP / DMAc with the weight ratios of 10 / 5 / 87 and 13 / 5 / 822 respectively were fully stirred and dissolved in the flask at about 45°C for 36h, until The polymer is completely dissolved, and the solution remains clear; the above-mentioned membrane-forming solution is filtered with a Buchner funnel, then vacuum defoamed, and left to stand for use. Install the polyester non-woven fabric on the compound 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 blade between the scraper and the support layer to 150μm; the ambient temperature is 26°C , pour the film-making solution at 26°C into the feed tank, and then scrape the film. The solution is scraped on the support layer, run in the air for 5s, and then immersed in the coagulation bath at 28°C. The coagula...

Embodiment 2

[0054] Effect of solvent on membrane structure and performance

[0055] The blended polyethersulfone (PES and SPES mass ratio is 4:1) / PVP / solvent with a mass ratio of 10 / 5 / 85 was fully stirred and dissolved in a flask at about 45°C for 36 hours until the polymer was completely dissolved. The solvents are DMAc, NMP, DMF, DMSO respectively. The subsequent scraping 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 membranes are listed in Table 3.

[0056] Film number

Embodiment 3

[0058] Effect of PVP content on membrane structure and performance

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

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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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