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Large aperture polyethersulfone film, preparation method and usage thereof

A technology of polyethersulfone membrane and large pore size, which is applied in the field of polyethersulfone membrane, and can solve the problems of membrane performance and quality influence and numerous steps

Inactive Publication Date: 2007-04-25
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to promote the development and application of PES membrane in MBR process in environmental engineering and produce more significant social benefits and considerable economic benefits, people have developed high-flux PES membranes with the advantages of large water production and good filtration stability, such as The patent application document of CN1504257A discloses the preparation method of utilizing inorganic additive (porogen) to prepare high flux PES porous membrane, the pure water flux of the prepared PES membrane is 230l / m 2 h, but there are many steps, and the post-treatment with dilute acid may affect the membrane performance and quality

Method used

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  • Large aperture polyethersulfone film, preparation method and usage thereof

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Experimental program
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Effect test

Embodiment 1

[0028] According to the total weight of 15kg, weigh PES (polyethersulfone, η is 0.48) 9%, 1.35kg; PVP (polyvinylpyrrolidone) 8%, 1.2kg; NMP (N-methyl-2-pyrrolidone) solution 83% , 12.45kg; the casting solution was prepared by blending, heating, stirring and dissolving at 50°C for 7 days. The resulting casting solution is filtered through a filter cloth of 80-100 mesh. The casting solution is salivated to the polyester non-woven fabric (density 95 g / m 2 , thickness 0.15 mm) on. Adjust film-making machine blade gap 0.35 mm, film-forming speed 3.5 m / min, film-making chamber air relative humidity 56%, gel solution (tap water) temperature 18-19 ° C under the conditions of continuous film production.

Embodiment 2

[0030] According to the total weight of 15kg, weigh PES (polyethersulfone, η is 0.50) 11%, 1.65kg; PVP (polyvinylpyrrolidone) 9%, 1.35kg; NMP (N-methyl-2-pyrrolidone) solution 80% , 12kg; blending and preparing casting solution, heating and stirring at 50°C for 8 days to dissolve. The resulting casting solution is filtered through a filter cloth of 80-100 mesh. The casting solution is salivated to the polyester non-woven fabric (density 90 g / m 2 , thickness 0.15 mm) on. Adjust the gap between the scraper blades of the film-making machine to 0.30 mm, the film-forming speed to 3.0 m / min, the relative humidity of the air in the film-making room to be 56%, and the temperature of the gel solution (tap water) to be 20-22°C for continuous film production.

Embodiment 3

[0032]Based on the total weight of 15kg, weigh PES (polyethersulfone, η is 0.55) 13%, 1.95kg; PVP (polyvinylpyrrolidone) 10%, 1.5kg; NMP (N-methyl-2-pyrrolidone) solution 77% , 11.55kg; the casting solution was prepared by blending, heating and stirring at 50°C for 9 days to dissolve. The resulting casting solution is filtered through a filter cloth of 80-100 mesh. The casting solution is salivated to the polyester non-woven fabric (density 80 g / m 2 , thickness 0.15 mm) on. Adjust the gap between the scraper blades of the film-making machine to 0.25 mm, the film-forming speed to 2.5 m / min, the relative air humidity in the film-making chamber to 56%, and the temperature of the gel solution (tap water) to form films continuously at 24-25°C.

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Abstract

The invention relates to a method for preparing large-aperature polyethersulfone film. Where, it comprises that: 1, as mass percentages, dissolving 9-15% polyethersulfone at 0.4-0.6 viscosity, polyvinyl pyrrolidon additive at 5-10% into organic solvent at 75-86%; mixing into casting film solution; 2, extending said solution on the non-woven cloth, the scrap film thickness is 0.20-0.35mm, the filming speed is 1.5-4.5m / min; 3, processing general gel water bath on the non-woven cloth to obtain film. The inventive film has 0.05-0.35micrometer aperture, as the filter film of filter biological reactor.

Description

technical field [0001] The invention relates to a polyethersulfone membrane, in particular to a polyethersulfone membrane with a large pore size, a preparation method thereof and an application as a special filter membrane in a membrane bioreactor (MBR) process. Background technique [0002] In recent years, membrane separation technology has developed rapidly. According to the size of the membrane separation object and the method of use, the membrane pores can be divided into reverse osmosis membrane (RO), nanofiltration membrane (NF), ultrafiltration membrane (UF) and Microfiltration membrane (MF), these membranes are widely used in food industry, electronics industry, water treatment engineering, biochemistry, medicine, chemical industry and other fields. In actual operation, the above-mentioned different membranes are often selected according to the objects to be separated. For example, microfiltration is a precision filtration technology. Microfiltration membrane is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02
Inventor 刘光全陆晓峰刘忠英梁国明楼福乐
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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