Quaternary ammonium salt functionalized polysulfone/nano attapulgite hybridized anion exchange membrane and preparation method thereof
An anion exchange membrane and nano attapulgite technology, applied in the direction of anion exchanger materials, chemical instruments and methods, membranes, etc., can solve the problems of hydroxide ion conductivity and alkali resistance stability to be improved, and achieve good resistance Alkali stability, large reserves, simple and safe experimental process
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[0051] For polysulfone functionalized with quaternary ammonium salt as shown in formula (I), its preparation method mainly includes the following steps:
[0052] Dissolve polysulfone in the first organic solvent, stir to form a polymer solution, then add chloromethylation reagent and catalyst, inert gas protection, stir and react for a period of time to obtain polysulfone with different chloromethylation degrees, the chloromethylation The base reagent is trimethylchlorosilane and paraformaldehyde, the catalyst is anhydrous tin tetrachloride or anhydrous tin dichloride; the chloromethylated polysulfone material is dissolved in the second organic solvent, and the alkaline function is added Reagent, react to obtain the polysulfone solution of positively charged quaternary ammonium salt functionalization;
[0053] Polysulfone should first be dissolved in the first organic solvent, the first organic solvent is preferably chloroform, dichloromethane, N-methyl-2 pyrrolidone, N,N-dime...
Embodiment 1
[0089] Example 1 Preparation of chloromethylated polysulfone
[0090] Add 3.0 g of polysulfone and 150 mL of dichloromethane to a four-neck flask equipped with an inlet pipe, mechanical stirring, and condensing reflux, under nitrogen protection, and condense and reflux at 30 °C for 30 min to fully dissolve, then add 1.02 g of paraformaldehyde, 8.6 mL trimethylchlorosilane, 0.08 mL anhydrous tin tetrachloride, nitrogen protection, reflux at 45 °C and stir for 36 h. After the reaction, precipitate with excess absolute ethanol, obtain a white solid by vacuum filtration, which is the chloromethylated polysulfone material, wash with absolute ethanol three times, and finally vacuum-dry the chloromethylated polysulfone at 60 °C for 24 h to obtain chloromethylated polysulfone material. The proton nuclear magnetic resonance spectrum of the chloromethylated polysulfone material that embodiment 1 obtains is as follows figure 1 shown, from figure 1 It can be seen that the chloromethy...
Embodiment 2
[0100] Example 2 Preparation of positively charged quaternary ammonium salt functionalized polysulfone / attapulgite ion exchange membrane
[0101] Preparation of chloromethylated polysulfone: the same preparation process as in Example 1 was adopted.
[0102] Uniformly dispersed nano-attapulgite solution configuration: put 0.0231 g of high-grade nano-attapulgite in 50 mL of N,N-dimethylacetamide solution, disperse with high-power ultrasonic for 15 min, and obtain 0.462 mg / mL nano- Attapulgite in N,N-dimethylacetamide solution.
[0103] Preparation of casting solution: Take 3.3 g of chloromethylated polysulfone material, add 33 mL of N,N-dimethylacetamide, stir and dissolve at 30 °C to form a polymer solution with a mass volume fraction of 10%, and then add 3.4 mL of trimethylamine solution was stirred at 50 °C, and the positively charged quaternary ammonium salt functionalization reaction of chloromethylated polysulfone was carried out, and the reaction time was 24 h. Then tak...
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