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Charged nanofiltration membrane preparing method

A nanofiltration membrane and charging technology, which is applied in the field of preparation of charged nanofiltration membranes, can solve the problems of poor permeability of nanofiltration membranes, high technical difficulty of polymerization reaction, difficult product quality control, etc., and achieves uniform membrane structure, Stabilize the retention rate and reduce the effect of the reaction

Inactive Publication Date: 2015-10-28
WUXI QIAOYANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the interfacial polycondensation method has strict requirements on the composition of the monomers, the technical difficulty of the polymerization reaction is high, and the product quality is not easy to control; and the permeability of the nanofiltration membrane prepared by the phase transition method is often poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take the newly made polysulfone ultrafiltration membrane as the base membrane, and the molecular weight cut-off of the polysulfone polymer used for the membrane is 7000D. After the base membrane is washed repeatedly with deionized water, it is soaked in 0.5% olefin Soak in a rigid airtight container of sodium propyl sulfonate solution for 10 minutes, then evacuate the rigid airtight container to reduce the pressure to 0.5 atmospheres, and keep it for 2 minutes to fully immerse sodium propyl sulfonate into the ultrafiltration membrane in the tunnel;

[0016] (2) Take out the treated basement film in step (1), place it under a 400W UV lamp to irradiate the graft, fill it with nitrogen protection, the distance between the basement film and the UV lamp is 5cm, and the time for irradiation grafting After the grafting is completed, take it out and ultrasonically clean it with deionized water for more than three times to obtain the charged nanofiltration membrane. After t...

Embodiment 2

[0018] (1) Take the newly made polysulfone ultrafiltration membrane as the base membrane, and the molecular weight cut-off of the polysulfone polymer used for membrane making is 8000D. After the base membrane is rinsed repeatedly with deionized water, it is soaked in an olefin containing 10% mass concentration. Soak in a rigid airtight container of sodium propyl sulfonate solution for 10 minutes, then evacuate the rigid airtight container to reduce the pressure to 0.8 atmospheres, and keep it for 10 minutes to fully immerse sodium propyl sulfonate into the ultrafiltration membrane in the tunnel;

[0019] (2) Take out the treated basement film in step (1), place it under a UV lamp with a power of 400W to irradiate the graft, fill it with nitrogen protection, the distance between the basement film and the UV lamp is 10cm, and the time for irradiation grafting After the grafting is completed, take it out and ultrasonically clean it with deionized water for more than three times t...

Embodiment 3

[0021] (1) Take the newly made polysulfone ultrafiltration membrane as the base membrane, and the molecular weight cut-off of the polysulfone polymer used for the film making is 9000D. After the base membrane is washed repeatedly with deionized water, it is soaked in a solution containing olefin with a mass concentration of 5%. Soak in a rigid airtight container of sodium propyl sulfonate solution for 8 minutes, then evacuate the rigid airtight container to reduce the pressure to 0.6 atmospheric pressure, and keep it for 8 minutes to fully immerse sodium propyl sulfonate into the ultrafiltration membrane in the tunnel;

[0022] (2) Take out the treated basement film in step (1), place it under a UV lamp with a power of 400W to irradiate the graft, fill it with nitrogen protection, the distance between the basement film and the UV lamp is 10cm, and the time for irradiation grafting After the grafting is completed, take it out and ultrasonically clean it with deionized water for...

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PUM

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Abstract

The invention discloses a charged nanofiltration membrane preparing method. According to the method, a newly-prepared ultrafiltration membrane serves as a base membrane, base membrane polymer is photosensitive polymer with a main chain or a side chain provided with carbonyl or sulfonyl, the base membrane is soaked in a rigid airtight container containing a grafting monomer solution after being cleaned, vacuumizing is conducted on the rigid airtight container after the base membrane is soaked, and the intensity of pressure in the container is made to be negative pressure; the processed base membrane is taken out to be placed under an ultraviolet lamp to conduct stem grafting in an illumination mode, nitrogen is injected to protect the base membrane, then the base membrane is taken out to be cleaned with deionized water more than three times, and a charged nanofiltration membrane is obtained. According to the method, an interfacial polymerization mode is adopted, the positively-charged nanofiltration membrane is prepared on the base membrane, the prepared nanofiltration membrane is charged, high in stability, high in retention rate and capable of achieving industrial production on the basis of an existing composite film production line.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of separation membranes, and in particular relates to a preparation method of charged nanofiltration membranes. Background technique [0002] Nanofiltration membrane (NF) first appeared in the late 1970s and is a membrane separation technology that has developed rapidly in recent years. The nanofiltration membrane is a pressure-driven separation membrane with a pore size between the reverse osmosis membrane and the ultrafiltration membrane. It began with J.E.Cadotte's research on the NS-300 membrane, and obtained a functional separation layer and a porous membrane through interfacial polymerization. The composite membrane with optimized support layer greatly improves the performance of nanofiltration membrane products. In the 1990s, nanofiltration membranes developed rapidly, and a number of nanofiltration membranes with unique separation performance were developed and commercialized ...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/02B01D67/00
Inventor 沈秋
Owner WUXI QIAOYANG MACHINERY MFG
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