A method for preparing zwitterionic membranes based on amphoteric polysilicon copolymers
A zwitterion and copolymer technology, applied in the field of membrane manufacturing, can solve the problems of low activity, lack of flexibility and film-forming ability of the product, low degree of reaction, etc., to achieve good flexibility, high uniformity and high controllability. Effect
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Embodiment 1
[0032] Zwitterionic membranes were prepared from amphoteric polysilicon copolymers containing both -SO3Na and -N+(CH3)3Cl- groups.
[0033] Raw material preparation:
[0034] (1) Dissolution of polyvinyl alcohol: The polyvinyl alcohol was obtained from Shanghai Sinopharm Chemical Reagent Co., Ltd., the degree of polymerization was 1750±50, 42.4 g of solid polyvinyl alcohol was taken, immersed in 760 mL of water for one day, under stirring conditions, and then added with 8 The heating rate of ℃ / h is raised to 102 ℃, and the temperature is kept at 102 ℃ for 2.5 hours (h) to obtain a uniform and transparent solution, which is cooled to 60 ℃ for later use, and the mass concentration of the solution is 5%;
[0035] (2) Recrystallization of azobisisobutyronitrile (AIBN, Shanghai Sinopharm Chemical Reagent Co., Ltd.): 10 g of AIBN was dissolved in 100 mL of 50°C ethanol, cooled and crystallized in an ice-salt bath, and the crystalline product was obtained after suction filtration. D...
Embodiment 2
[0055] Zwitterionic membranes were prepared from amphoteric polysilicon copolymers containing both -COOH and -N+(CH3)3Cl- groups.
[0056] Preparation of raw materials:
[0057] (1) The dissolution of PVA is similar to Example 1, but 42.4 g of polyvinyl alcohol raw material is soaked in 360 mL of water for one day, and the mass concentration of the obtained solution is 10%;
[0058] (2) The purification of AIBN is the same as in Example 1, and acrylic acid and the rest of the chemical reagents are all from Shanghai Sinopharm Chemical Reagent Co., Ltd.;
[0059] (3) 1 volume of commercially available trimethylamine aqueous solution is uniformly mixed with 2.5 times the volume of water to obtain a trimethylamine aqueous solution with a concentration of about 9%, followed by the following steps:
[0060] experiment method:
[0061] Preparation of amphoteric polysilicon copolymer: add 360 mL of DMF to a round-bottomed flask equipped with a reflux condenser and a drying tube, add...
Embodiment 3
[0067] A method for preparing a zwitterionic membrane based on an amphoteric polysilicon copolymer, the preparation process is the same as that of Example 2, except that the membrane after heat treatment is immersed in an aqueous solution of trimethylamine with a mass concentration of 20% for 36 hours to obtain a zwitterionic membrane.
[0068] The test results show that the water content of the membrane is 155.3%; IEC-positive is 3.59 mmol / g, IEC-negative is 0.41 mmol / g, the swelling degree after 24h in 65℃ water is 297.5%, and the loss rate is 13.2%. Compared with Example 2, the zwitterionic membrane prepared in this example has higher anion exchange capacity and degree of swelling, indicating that in the process of soaking the membrane in the trimethylamine aqueous solution, if the concentration and soaking time of trimethylamine are increased, the The degree of ammoniumization of the membrane, thereby increasing the hydrophilicity of the membrane.
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