Double ion modified cellulose membrane and making method thereof
A cellulose membrane and dual-ion technology, applied in the field of dual-ion modified cellulose membrane and its preparation, can solve the problems of decreased membrane flux, harsh conditions, complicated processes, etc. good water effect
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Embodiment 1
[0038] The preparation method of double-ion modified cellulose membrane may further comprise the steps:
[0039] (1) Preparation of (3-carboxypropylbetaine propyl) trimethoxysilane
[0040] Dissolve β-propiolactone (1.799 g, 0.025 mol) in 20 mL of purified anhydrous acetone and add dropwise to purified anhydrous acetone of (N,N-dimethyl-3-aminopropyl)trimethoxysilane In the solution, the volume of (N,N-dimethyl-3-aminopropyl)trimethoxysilane is 5.68mL, under the protection of nitrogen, react at room temperature for 5 hours, and the white solid obtained is washed with anhydrous acetone , and then washed with anhydrous ether, and finally the solvent was removed under reduced pressure, vacuum freeze-dried, and the monomer was stored at 2-8°C.
[0041] 1 H-NMR(DMSO-6D,300MHz):δ0.5-0.6(t,2H,Si-C H 2 ),1.5-2.0(t,2H,C-C H 2 -C),2.5-3.0(m,2H,C-C H 2 -N),3.2-3.5(m,2H,N-C H 2 -C),3.0(s,6H,C H 3 -N-C H 3 ),2.5-2.6(t,2H,C H 2 -COO-),3.0-3.5(s,9H,C H 3 -O-Si).
[0042] E...
Embodiment 2
[0054] The preparation method of double-ion modified cellulose membrane may further comprise the steps:
[0055] (1) Preparation of (3-sulfopropylbetaine propyl) trimethoxysilane:
[0056] Add 7.5mL (N,N-dimethyl-3-aminopropyl)trimethoxysilane and 4.5g (3.23mol) 1,3-propane sultone to 37mL solvent-purified anhydrous acetone at 25°C Stir and react under the conditions for 12 hours, a white solid is formed, wash with acetone 4 times, filter with suction, dry under vacuum at 30°C, and store in a sealed container;
[0057] 1 HNMR(DMSO-6D,300MHz):δ0.4-0.6(t,2H,O-Si-C H 2 ),1.6-1.8(m,2H,C-C H 2 -C-Si),1.9-2.0(m,2H,S-C-C H 2 -C),2.4-2.5(t,2H,C-C H 2 -N),3.0(S,6H,C H 3 -N-C H 3 ),3.1-3.3(m,2H,N-C H 2 -C),3.3-3.4(m,2H,C-C H 2 -S),3.5(s,9H,C H 3 -O-Si).
[0058] Experiments have shown that the reaction in this step was stirred and reacted at 35°C for 8 hours, the number of times of washing with acetone was 2 times, and when the temperature of vacuum drying was 40°C, ...
Embodiment 3
[0069] The preparation method of double-ion modified cellulose membrane may further comprise the steps:
[0070] (1) Preparation of (3-sulfobutyl betaine propyl) trimethoxysilane:
[0071] Mix 7.5mL (N,N-dimethyl-3-aminopropyl)trimethoxysilane and 3.5mL 1,4-butane sultone evenly, raise the temperature to 60°C for 1 hour, cool to room temperature, and get The white solid was washed with anhydrous acetone, suction filtered, vacuum-dried, and sealed for storage;
[0072] 1 HNMR(DMSO-6D,300MHz):δ0.58(t,2H,O-Si-C H 2 ),1.6(m,2H,O-Si-C-C H 2 ),1.72(m,2H,N-C-C-C H 2 -C-S),2.08(S,2H,N-C-C H 2 ),2.4-2.5(t,2H,O-Si-C-C-C H 2 ),2.96(s,6H,C H 3 -N-CH3),3.16(m,2H,N-C H 2 ),3.43(m,2H,N-C-C-C-C H 2 -S),3.51(m,9H,Si-O-C H 3 ).
[0073] Experiments have proved that (3-sulfobutylbetaine propyl) trimethoxysilane can be obtained by reacting at 50°C for 2 hours in this example
[0074] (2) Take three containers, add 30mL of methanol and 1.67g of the product obtained in step (1)...
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