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 react

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1

[0015] (1) Using the newly made polysulfone ultrafiltration membrane as the base membrane, the molecular weight cut-off of the membrane-forming polysulfone polymer is 7000D. The base membrane is washed repeatedly with deionized water and then immersed in an olefin with a mass concentration of 0.5%. Soak in a rigid airtight container of sodium propyl sulfonate solution for 10 minutes, then evacuate the rigid airtight container to reduce the pressure in it to 0.5 barometric pressure and hold for 2 minutes to fully immerse the sodium allyl sulfonate into the ultrafiltration membrane In the tunnel

[0016] (2) Take out the base film treated in step (1) and place it under a 400W UV lamp to irradiate grafting, and fill it with nitrogen for protection. The distance between the base film and the UV lamp is 5cm, and the time for irradiation to graft The time is 0.5 min. After the grafting is completed, it is taken out and ultrasonically cleaned with deionized water for m...

Example Embodiment

[0017] Example 2

[0018] (1) Using the newly made polysulfone ultrafiltration membrane as the base membrane, the molecular weight cut-off of the membrane-forming polysulfone polymer is 8000D. The base membrane is washed repeatedly with deionized water and then immersed in an olefin with a mass concentration of 10%. Soak in a rigid airtight container of sodium propyl sulfonate solution for 10 minutes, and then evacuate the rigid airtight container to reduce the pressure in it to 0.8 atmospheres, and hold for 10 minutes to fully immerse the sodium allyl sulfonate into the ultrafiltration membrane In the tunnel

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

Example Embodiment

[0020] Example 3

[0021] (1) Using the newly made polysulfone ultrafiltration membrane as the base membrane, the molecular weight cut-off of the membrane-forming polysulfone polymer is 9000D. The base membrane is washed repeatedly with deionized water and then immersed in a 5% mass concentration of olefin. Soak in a rigid airtight container of sodium propyl sulfonate solution for 8 minutes, and then evacuate the rigid airtight container to reduce the pressure in it to 0.6 atmospheres and hold for 8 minutes to fully immerse the sodium allyl sulfonate into the ultrafiltration membrane In the tunnel

[0022] (2) Take out the base film treated in step (1) and place it under a 400W UV lamp to irradiate grafting, and fill it with nitrogen for protection. The distance between the base film and the UV lamp is 10cm, and the time for irradiation to graft The time is 10 minutes. After the grafting is completed, it is taken out and ultrasonically cleaned with deionized water for more than th...

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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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