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Method for preparing reinforced hollow fiber membrane of braided tube by using low-temperature thermal-induced phase separation method

A braided tube and phase separation technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. Effect

Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of thermally induced phase separation in the preparation of braided tube-reinforced hollow fiber membranes is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Select N,N-dimethylacetamide and ethylene glycol with a mass ratio of 8:2 as the diluent, add polyvinylidene fluoride and the above diluent with a mass ratio of 2.5:7.5 into the stirring tank and mix evenly, and heat to 90°C, fully stir until the mixed system becomes a homogeneous solution, then let it stand for defoaming. Then the solution was extruded through the outer hole of the ring-shaped spinning head under a pressure of 0.2 MPa, and coated on the surface of the polypropylene braided tube passing through the inner hole of the ring-shaped spinning head at a speed of 3 m / min. After the braided tube coated with the solution passed through a 2 cm air gap, it was immersed in water at 10°C, and then the diluent was removed in ethanol at 25°C, and the braided tube-reinforced hollow fiber membrane was obtained by winding.

[0022] The above-mentioned braided tube-reinforced hollow fiber membrane was made into a membrane module to test the water flux. Under external press...

Embodiment 2

[0027] Choose dimethyl sulfoxide and glycerin with a mass ratio of 8:2 as the diluent, add polyacrylonitrile with a mass ratio of 3:7 and the above diluent into the stirring tank and mix evenly, heat to 80°C, and stir thoroughly After the mixed system becomes a homogeneous solution, let stand for defoaming. Then the solution was extruded through the outer hole of the ring-shaped spinning head under a pressure of 0.2 MPa, and coated on the surface of the polyester braided tube passing through the inner hole of the ring-shaped spinning head at a speed of 2 m / min. After the braided tube coated with the solution passed through a 2 cm air gap, it was immersed in water at 10°C, and then the diluent was removed in methanol at 20°C, and the braided tube-reinforced hollow fiber membrane was obtained by winding.

[0028] The above-mentioned braided tube-reinforced hollow fiber membrane was made into a membrane module to test the water flux. Under external pressure conditions, the water ...

Embodiment 3

[0030] Select N,N-dimethylformamide and ethylene glycol with a mass ratio of 4:6 as the diluent, add polyvinylidene fluoride and the above diluent with a mass ratio of 1:9 to the stirring tank and mix evenly, and heat to 150°C, fully stir until the mixed system becomes a homogeneous solution, then let it stand for defoaming. Then the solution was extruded through the outer hole of the ring-shaped spinning head under a pressure of 0.1 MPa, and coated on the surface of the glass fiber braided tube passing through the inner hole of the ring-shaped spinning head at a speed of 18 m / min. After the braided tube coated with the solution passed through a 10 cm air gap, it was immersed in a mixed cooling bath of water and N,N-dimethylformamide with a mass ratio of 5:5 at 0°C, and then diluted in ethanol at 10°C. agent, wound to obtain a braided tube reinforced hollow fiber membrane.

[0031] The above-mentioned braided tube-reinforced hollow fiber membrane was made into a membrane modu...

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PUM

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Abstract

The invention discloses a method for preparing a reinforced hollow fiber membrane of a braided tube by using a low-temperature thermal-induced phase separation method. The method comprises the following steps of: 1) mixing polymer with a diluting agent, heating and dissolving, and configuring polymer solution; 2) coating the polymer solution onto the surface of the braided tube; and 3) generating thermal-induced phase separation in cooling bath and successively removing the diluting agent in an extracting agent to prepare the reinforced hollow fiber membrane of the braided tube. The invention has the beneficial effects that as the diluting agent capable of dissolving the polymer at a lower temperature is adopted in the method, the destructive effect caused by high temperature required by the conventional thermal-induced phase separation method on a braided tube structure can be prevented; the invention provides a new process for preparing the reinforced hollow fiber membrane of the braided tube by using the thermal-induced phase separation method with good universality for braided tube materials; and the prepared reinforced hollow fiber membrane of the braided tube has high strength and is low in cost.

Description

technical field [0001] The invention relates to the technical field of preparation of separation membranes, in particular to a method for preparing braided tube-reinforced hollow fiber membranes through low-temperature thermal phase separation. Background technique [0002] 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. Polymer hollow fiber membranes are widely used in membrane bioreactors, drinking water purification, industrial filtration and other fields, but there are still some shortcomings, such as mechanical properties that cannot fully meet the requirements, and are prone to broken filaments; currently commonly used Polyvinylidene fluoride is expensive. The braided tube reinforced polymer hollow fiber membrane can significantly improve the mechanical strength of t...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00B01D69/08
Inventor 徐志康万灵书黄小军
Owner ZHEJIANG UNIV
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