Preparation method of anti-pollution aliphatic PVC anion exchange membrane

An anion-exchange membrane and aliphatic technology, applied in the field of separation membranes, can solve problems such as high water absorption and complex ion membrane preparation process, and achieve the effects of reduced adsorption, good anti-pollution ability, and simple preparation process

Pending Publication Date: 2020-05-12
ZHEJIANG UNIV OF TECH +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Hwang et al used a two-step method to chloromethylate and aminate polyvinyl chloride to prepare a polyvinyl chloride anion exchange membrane. The ion exchange flux can reach 3.7meq / g, but the water absorption rate is as high as 63.1%. And the ion membrane preparation process is complex

Method used

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  • Preparation method of anti-pollution aliphatic PVC anion exchange membrane
  • Preparation method of anti-pollution aliphatic PVC anion exchange membrane
  • Preparation method of anti-pollution aliphatic PVC anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 10g of PVC powder to 90g of N,N-dimethylacetamide, heat to 60°C, dissolve to obtain a 10% solution, vacuum defoam the PVC solution, pour it on a glass plate, and scrape it with a scraper with a thickness of 100μm Apply it as a wet film, dry and evaporate the solvent on a flat heater at 60°C to obtain a PVC film. Take off the PVC membrane and soak it in 50mL of 70% triethylenetetramine aqueous solution at 60°C, take it out after reacting for h to obtain a quaternized and cross-linked QPVC-1 anion exchange membrane; take it out and rinse the surface with distilled water, soak it in 0.5M in NaCl solution for use. from figure 1 It can be seen from the SEM image that the surface and cross section of the QPVC film layer are dense and uniform, without holes and cracks.

Embodiment 2

[0033] Change the soaking time in the above example 1 to 8h, and keep other steps unchanged to obtain anion exchange membrane QPVC-2.

Embodiment 3

[0035] Change the soaking time in the above example 1 to 12h, and keep other steps unchanged to obtain anion exchange membrane QPVC-3.

[0036] Carry out ion exchange capacity (IEC) and membrane resistance (R to the QPVC ion-exchange membrane that embodiment prepares n ) investigation, such as Figure 4 As shown, with the prolongation of soaking time of PVC film in triethylenetetramine solution, IEC gradually increases, and R n Gradually decreases. This is because the longer the soaking time, the more quaternary ammonium salt functional groups grafted onto the PVC main chain, the more ion exchange flux, and the more ion transmission channels provided by the more hydrophilic quaternary ammonium salt, the mask resistance reduce.

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Abstract

The invention discloses a preparation method of an anti-pollution aliphatic PVC anion exchange membrane. The preparation method comprises the following steps: 1) preparing a PVC base membrane; and 2)soaking the PVC base membrane prepared in the step 1) in a 50-70 wt% triethylene tetramine aqueous solution at 30-60 DEG C, reacting for 2-14 hours, and taking out to obtain the aliphatic PVC anion exchange membrane. According to the invention, quaternization and cross-linking of the PVC membrane are completed by adopting a one-step soaking method, the preparation process is simple, the conditionsare mild, and the obtained anion exchange membrane c-QPVC-N has a hydrophilic membrane surface and an aliphatic membrane matrix, so that the c-QPVC-N has good anti-pollution capability and has industrial potential.

Description

technical field [0001] The invention belongs to the technical field of separation membranes, and in particular relates to a simple preparation method of an anti-pollution aliphatic PVC anion exchange membrane. Background technique [0002] In recent decades, electrodialysis (ED) technology has been widely used in the recovery of desalinated water. Ion exchange membranes (AEMs), as the core components of electrodialysis devices, play an important role in determining the performance of seawater desalination. In recent years, polymers such as polysulfone, polyethersulfone, and polystyrene have been extensively studied as substrates for membrane synthesis. However, there are still some problems to be solved in the performance of ionic membranes, such as high price, instability, and easy pollution, which lead to poor operating performance of the membrane. Therefore, developing low-cost, antifouling ion-exchange membranes is an important challenge in the development of EDs. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/14C02F1/469C02F103/08
CPCB01J41/14C02F1/4693C02F2103/08
Inventor 沈江南刘元伟王超王利祥
Owner ZHEJIANG UNIV OF TECH
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