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Preparation method of composite separating film with uniform surface apertures

A separation membrane and pore size technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of inability to form a porous membrane with filtration separation function, irregular pore shape, wide pore size distribution, etc., reaching time-consuming Short, simple, and versatile effects

Inactive Publication Date: 2010-12-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although polymer separation membranes have been widely used, there are still some shortcomings in existing polymer separation membranes: for example, the pore size distribution is wide, and some commercial polypropylene microporous membranes with an average pore size of 0.2 microns, The actual pore diameter may be between 0.05 and 1.2 microns; the shape of the pores is irregular, and some separation membranes are irregular and close to circular pores, while some separation membranes are oblong pores
At present, the water-assisted method obtains only the surface pore structure, not through, so it is impossible to form a porous membrane with filtration and separation functions

Method used

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  • Preparation method of composite separating film with uniform surface apertures

Examples

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Embodiment 1

[0026] First use chloroform as a solvent, configure a polystyrene solution with a concentration of 20 mg / mL, and evenly coat the prepared polystyrene solution on the surface of a polypropylene flat non-woven fabric (as a base film) with a pore size of 5 microns. The amount of polystyrene solution is about 100 ml / m2 base film. Then place the base membrane coated with the polymer solution for 3 minutes in an environment with a relative humidity of 85% at 18°C ​​to prepare a composite separation membrane with through holes, uniform surface pore size and a pore size of 1.2 microns, scanning electron microscopy see photos figure 1 .

Embodiment 2

[0028] First, ethyl acetate was used as a solvent to configure a polylactic acid solution with a concentration of 20 mg / mL, and the prepared polylactic acid solution was evenly coated on the surface of a polyester flat non-woven fabric (as a base film) with a pore size of 5 microns. The amount of solution used is approximately 100 ml / m2 of basement film. Then place the base membrane coated with the polymer solution in an environment of 25° C. and a relative humidity of 85% for 3 minutes to prepare a composite separation membrane with through holes, uniform surface pore size and a pore size of 1 micron.

Embodiment 3

[0030] First use toluene as a solvent, configure a cellulose solution with a concentration of 20 mg / mL, and evenly coat the prepared cellulose solution on the surface of a cellulose flat non-woven fabric (as a base film) with a pore size of 5 microns. Approximately 100 ml / m2 basement film. Then place the base membrane coated with the polymer solution in an environment of 25° C. and a relative humidity of 85% for 3 minutes to prepare a composite separation membrane with through holes, uniform surface pore size and a pore size of 2.2 microns.

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Abstract

The invention discloses a preparation method of a composite separating film with uniform surface apertures. The method comprises the following steps of: dissolving a polymer to a solvent and preparing a polymer solution; (2) adopting a porous material as a basement membrane; (3) coating the polymer solution obtained in the step (1) on the surface of the basement membrane in a mode of dipping, coating or spraying, and the like; and (4) arranging the basement membrane coated with the polymer solution in an environment at a temperature of 18-35 DEG C under a relative moisture of 60-95 percent to prepare a composite separating film with uniform surface apertures. In the invention, a composite layer with uniform surface apertures is formed on the surface of the porous material by adopting a water-assisted method, and the preparation method has simple operation and short time consumption, can adjust the uniform apertures of the composite separating film and has strong universality and wide application prospects in the field of precise filtration.

Description

technical field [0001] The invention relates to the field of preparation of separation membranes, in particular to a preparation method of a composite separation membrane with uniform surface pore size. Background technique [0002] Polymer separation membranes are widely used in many fields such as water treatment, gas separation, and industrial filtration. As people pay more and more attention to the environment and resources, membrane separation technology is considered to be a key common technology for energy saving and emission reduction, as well as a supporting technology for sustainable development. Although polymer separation membranes have been widely used, there are still some shortcomings in existing polymer separation membranes: for example, the pore size distribution is wide, and some commercial polypropylene microporous membranes with an average pore size of 0.2 microns, The actual pore diameter may be between 0.05 and 1.2 microns; the shape of the pores is ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/12B01D67/00
Inventor 万灵书柯蓓蓓徐志康
Owner ZHEJIANG UNIV