A modified tri-block copolymer electrolyte membrane and its preparation method

An electrolyte membrane and tri-block technology, applied in the field of electrolytes, can solve problems such as difficult separation and treatment, easy flocculation and instability of aluminum trichloride, and achieve high ion exchange capacity, safe and environmentally friendly preparation process, and optimized use effects

Inactive Publication Date: 2017-09-15
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the chloroacetyl chloride and Lewis acid catalysts used in this method are unstable in the air, and aluminum trichloride is easy to flocculate, and the post-separation treatment is difficult.

Method used

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  • A modified tri-block copolymer electrolyte membrane and its preparation method

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preparation example Construction

[0032] The present invention also provides a preparation method for the above-mentioned modified triblock copolymer electrolyte membrane, comprising the following steps:

[0033] Add the modified tri-block copolymer SEBS, excess trimethylamine and dimethylformamide into the reactor with a solid content of 5~20wt%, stir and react at 40°C for 24 hours, and then apply the reaction solution on a clean horizontal glass On the board, a film is naturally formed, placed in an environment of 60°C, the solvent is volatilized, and the film is peeled off to obtain a modified triblock copolymer electrolyte membrane.

[0034] In the present invention, the modified tri-block copolymer SEBS has the structure shown in formula II:

[0035] Formula II ,

[0036] In the formula, m, n, p are independently integers from 50 to 3000, 0

[0037] The present invention also provides a preparation method for the above-mentioned modified three-block copolymer SEBS, comprising the following...

Embodiment 1~7

[0045] Embodiment 1~7: the preparation of modified triblock copolymer SEBS

[0046] Add SEBS (containing a mmol of phenyl, commercially available, product brand Kraton G1652M), b mmol of 2-chloroacetic acid, cmL of solvent and d mmol of trifluoroacetic anhydride into a round bottom flask equipped with a condenser tube and a drying tube , stirring at temperature T for reaction time m, then slowly drop the reaction solution into ethanol, filter, soak the precipitate with 30 v% ethanol and wash until the pH is close to neutral, and dry to obtain the modified triblock copolymer SEBS, saved for later use;

[0047] Wherein, the amount of each component, solvent content and type, reaction temperature and time were tested according to the data in Table 1, thereby preparing chloroacetyl-modified SEBS with different chloroacetyl content.

[0048] Then, prepare the modified triblock copolymer electrolyte membrane, the preparation method is as follows:

[0049] Weigh respectively 1.0 g ...

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Abstract

The invention provides a modified triblock copolymer electrolyte membrane and a preparation method thereof, belonging to the technical field of electrolyte. The modified triblock copolymer electrolyte membrane has a structure as shown in the specification, wherein in the formula, m, n and p are respectively integers from 50 to 3000, x is more than zero and smaller than or equal to m, and y is more than zero and smaller than or equal to n; T is monovalent anion. The preparation method comprises the following steps: adding modified triblock copolymer SEBS and excess trimethylamine and dimethylformamide into a reactor, wherein the solid content is 5-20wt%; stirring for reaction for 24 hours at 40 DEG C, then coating reaction liquid to a clean horizontal glass board to form a membrane naturally, evaporating the solvent at the temperature of 60 DEG C, and stripping the membrane, thus obtaining the modified triblock copolymer electrolyte membrane. According to the invention, the conventional route of chloromethylation is abandoned, and a chloroacetyl modification method is adopted, so that the membrane is relatively environmental-friendly and safe, and an ion exchange membrane with higher chlorine content, namely, higher ion exchange capacity, and excellent conductivity can be obtained.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and in particular relates to a modified triblock copolymer electrolyte membrane and a preparation method thereof. Background technique [0002] At present, anion exchange membranes have been widely used in various energy-saving and clean production chemical fields, such as the recovery of metal ions and waste acids by membrane diffusion dialysis, the concentration and desalination of dilute salt solutions by membrane electrodialysis, and electrolytic diaphragms in hydrometallurgical industries. , anion selective electrodes, alkaline membrane fuel cells, etc. Cationic polymer electrolytes immobilized with positively charged ionic groups such as quaternary ammonium groups and quaternary phosphonium groups are the key components for the preparation of anion exchange membranes. [0003] The existing technology for preparing cationic polymer electrolytes is usually to chloromethylate the aryl gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/80B01D71/82B01D69/02B01D67/00
Inventor 张正辉马勤阁
Owner NANYANG NORMAL UNIV
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