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Membrane material of inorganic - organic hybrid pair of amphoteric ion, and preparation method

A zwitterion, organic hybrid technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor temperature resistance, limited application value, inability to ion exchange membrane, etc., and achieve high temperature resistance. , The effect of large charge capacity and good flexibility

Inactive Publication Date: 2012-12-12
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this method prepares organic materials, its temperature resistance is poor, and it needs a matrix as a support, so its application value is limited and it cannot be used as a material for preparing ion exchange membranes.

Method used

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  • Membrane material of inorganic - organic hybrid pair of amphoteric ion, and preparation method
  • Membrane material of inorganic - organic hybrid pair of amphoteric ion, and preparation method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0030] Example 1. Preparation of an inorganic-organic hybrid containing anion and cation exchange groups with the reactant ratio PEG-1000:anilinomethyltriethoxysilane (ND-42):bromoethane=1:2:4 Zwitterion Pair Membrane Materials

[0031] Using a 250ml three-neck flask equipped with a magnetic stirrer, a nitrogen inlet and a dropping funnel, add N,N-dimethylformamide (DMF), and add polyethylene glycol (PEG-1000) in a nitrogen atmosphere and a DMF solution of diisocyanate (TDI), and then add anilinomethyltriethoxysilane (ND-42) solution dropwise under stirring, and stir the reaction at 35°C. After reacting for 6 hours, add fuming sulfuric acid (20% SO 3 ) for sulfonation reaction, washed several times and then dried to remove unreacted substances to obtain a hybrid precursor containing cation exchange (acidic) groups; dissolve the charged hybrid precursor in DMF, and then add Bromoethane is reacted for 24 hours to graft an alkyl group on the molecular chain to obtain an anion e...

Embodiment 2

[0036] Example 2. Preparation of an inorganic-organic hybrid containing anion and cation exchange groups with reactant ratio PEG-1000:anilinomethyltriethoxysilane (ND-42):bromoethane=1:2:4 Zwitterion Pair Membrane Materials

[0037] Using the same device and operating process as in Example 1, only changing the order of sulfonation and amination reactions, that is, at 60 ° C, using the experimental procedure of first amination reaction and then sulfonation reaction, thus also can get Inorganic-organic hybrid zwitterion membrane material containing both anion and cation exchange groups.

[0038] The results of TGA and DrTGA thermal analysis show that the initial thermal degradation temperature of the hybrid membrane material is about 300°C, and the thermal degradation temperature is about 405°C; while the thermal degradation temperature of the positively charged hybrid membrane material containing amine groups is 370°C; It can be seen that the thermal stability of the hybrid zw...

Embodiment 3

[0041] Example 3. Preparation with reactant ratio mercaptopropyltrimethoxysilane: N-β-aminoethyl-γ-aminopropyltrimethoxysilane: ethyl bromide=1:1:4, containing anion and cation exchange Inorganic-Organic Hybrid Zwitterion Pair Membrane Materials

[0042] Measure N-β-aminoethyl-γ-aminopropyltrimethoxysilane and mercaptopropyltrimethoxysilane, dissolve them in DMF respectively, add bromoethane, and carry out amination reaction at 60°C; adjust N - The molar ratio of β-aminoethyl-γ-aminopropyltrimethoxysilane to mercaptopropyltrimethoxysilane and ethyl bromide is 1:1:4, and the stirring is continued for 6 hours at 30°C to obtain Sol-gel, the product is dried at 70°C to prepare a hybrid precursor containing an anion exchange group. This hybrid precursor is used as a raw material, dissolved in DMF, and then mercaptopropyl is oxidized with a hydrogen peroxide (30%) solution to generate a cation exchange group, and then analyzed by infrared spectroscopy and determined The content of...

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Abstract

The invention relates to a method for producing organic hybridization amphoteric ion pair to membrane material. Its characteristic is: carrying on amination reaction to hybridization forerunner body under 0-90deg.c the temperature to make it contain an anionic exchange groups, and then carrying on sulfonation or oxidation reaction to make it contain a cation exchange groups. Obtained anionic exchange groups and anionic exchange groups simultaneously, or carrying on sulfonation or oxidation reaction to hybridization forerunner body, and then carrying on amination reaction. The cation exchange groups arrange at the both side of backbone or on backbone. The anionic exchange groups arrange on backbone all the time to form the amphoteric ion pair structure with the cation exchange groups. Thismaterial has good flexibility, high heat resistance. The exchange capacity depends on the producing process. It can be used in producing exchange membrane material, separating the electrolyte and thenonelectrolyte and separating multivalence.

Description

Technical field: [0001] The invention belongs to the field of membrane technology, and in particular relates to a preparation method of an inorganic-organic hybrid zwitterion membrane material containing anion and cation exchange groups prepared by amination, sulfonation or oxidation reactions. Background technique: [0002] The US "Polymer Bulletin" (Polymer Bulletin 1998, 41:569-575) reported the research on the preparation of ionomers by blending sulfonated polystyrene and p-aminobenzoic acid. The method uses the sulfonic acid group in the sulfonated polystyrene as the source of the cationic group, and the amino group in the p-aminobenzoic acid as the source of the anionic group. Because it is an organic membrane material prepared by mechanical mixing, There is a phenomenon of macroscopic phase separation, and the temperature resistance is poor, so the application value is limited. [0003] U.S. Patent No. 7,005,489 reports that 4-10 positively charged groups of transiti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/00B01D71/82B01D69/10B01D69/12C08J5/22
Inventor 刘俊生程新星
Owner HEFEI UNIV
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