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A kind of preparation method of double branched node sulfonated polyimide membrane

A technology of sulfonated polyimide membranes and branched nodes, which is applied in the direction of electrochemical generators, bulk chemical production, structural parts, etc., can solve the problem of low proton conductivity and high voltage efficiency of sulfonated polyimide membranes , weak chemical stability and other problems, to achieve the effect of improving the interaction and free volume of space, solving the problem of low proton conductivity and weak chemical stability

Active Publication Date: 2022-02-08
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two bottleneck problems in the application of sulfonated polyimide membrane in VFB: (1) In the environment of strong acid and strong oxidizing electrolyte, the chemical stability of sulfonated polyimide membrane is weak, which seriously affects the Its service life in the battery; (2) In the application of VFB, the proton conductivity of sulfonated polyimide membrane is low, which is not conducive to the battery to obtain higher voltage efficiency

Method used

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  • A kind of preparation method of double branched node sulfonated polyimide membrane
  • A kind of preparation method of double branched node sulfonated polyimide membrane
  • A kind of preparation method of double branched node sulfonated polyimide membrane

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Embodiment 1

[0031] A kind of preparation method of double-branched knot sulfonated polyimide film, comprises the following steps:

[0032] Step 1. Under nitrogen protection, add 2.0mmol TNPOB, 20mL m-cresol Ⅰ, and 6.0mmol benzoic acid into a 250mL three-necked flask, and stir at 60°C until the solid is completely dissolved; then, add 0.9mmol BDSA, 20mL m-cresol Phenol II and 1.2mL triethylamine were placed in a beaker, stirred at 60°C until the solid was completely dissolved, then 1.4mmol TFAPOB was added, and after the solid was completely dissolved, the solution was slowly added dropwise into the above-mentioned three-necked flask with a constant pressure funnel. After 10 minutes of stirring and reacting at 60°C for 15 minutes, the double-branched sulfonated polyimide casting solution is obtained; the casting solution is poured on a dry and clean glass plate to form a film, and dried at 60°C for 20 hours ; Dry at 80°C, 100°C, 120°C, and 150°C for 1 hour each to obtain a triethylamine sa...

Embodiment 2

[0036] A kind of preparation method of double-branched knot sulfonated polyimide film, comprises the following steps:

[0037] Step 1. Under nitrogen protection, add 2.0mmol TNPOB, 20mL m-cresol Ⅰ, and 6.0mmol benzoic acid into a 250mL three-necked flask, and stir at 60°C until the solid is completely dissolved; then, add 1.2mmol BDSA, 20mL m-cresol Put Ⅱ and 1.5mL triethylamine in a beaker, stir at 60°C until the solid is completely dissolved, then add 1.2mmol TFAPOB, after the solid is completely dissolved, slowly add the solution dropwise into the above-mentioned three-necked flask with a constant pressure funnel, and the dropping time is 10min , after stirring and reacting at 50°C for 30 minutes, the double-branched sulfonated polyimide casting solution was obtained; the casting solution was poured on a dry and clean glass plate to form a film, and dried at 60°C for 16 hours; 80 °C, 100 °C, 120 °C, 150 °C for 2 hours each to obtain a triethylamine salt-type double-branched...

Embodiment 3

[0041] A kind of preparation method of double-branched knot sulfonated polyimide film, comprises the following steps:

[0042] Step 1. Under nitrogen protection, add 2.0mmol TNPOB, 20mL m-cresol Ⅰ, and 6.0mmol benzoic acid into a 250mL three-necked flask, and stir at 60°C until the solid is completely dissolved; then, add 1.5mmol BDSA, 20mL m-cresol Phenol II and 1.8mL triethylamine were placed in a beaker, stirred at 60°C until the solid was completely dissolved, then 1.0mmol TFAPOB was added, and after the solid was completely dissolved, the solution was slowly added dropwise into the above-mentioned three-necked flask with a constant pressure funnel, and added dropwise After 10 minutes, stirring and reacting at 80°C for 15 minutes, the double-branched sulfonated polyimide casting solution is obtained; the casting solution is poured on a dry and clean glass plate to form a film, and dried at 60°C for 18 hours ; Dry at 80°C, 100°C, 120°C, and 150°C for 1.5 hours each to obtai...

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Abstract

The invention discloses a preparation method of a double-branched sulfonated polyimide membrane, which comprises: adding m-cresol I, TNPOB and benzoic acid into a reactor under nitrogen protection, stirring and dissolving; adding m-cresol Ⅱ. Add BDSA and triethylamine into the container, stir to dissolve, then add TFAPOB to the container, stir to dissolve, then put the material in the container into the constant pressure dropping funnel, and drop into the reactor, and stir to react , to obtain the casting solution, pour the casting solution on a dry and clean glass plate to form a film, and then dry the glass plate under different temperature gradients to obtain a triethylamine salt type double-branched sulfonated polyimide membrane ; Soak the triethylamine salt type double-branched sulfonated polyimide membrane in absolute ethanol, then soak it in aqueous sulfuric acid, and then wash it with deionized water to obtain double-branched sulfonated polyimide membranes. The imide membrane is preserved by immersing it in deionized water; the vanadium ion permeability of the obtained double-branched sulfonated polyimide membrane is low and the proton selectivity is high.

Description

technical field [0001] The invention belongs to the field of battery separators, and relates to a preparation method and application of a double-branched knotted sulfonated polyimide membrane. Background technique [0002] With the rapid development of the times and the remarkable progress of science and technology, people's demand for energy is increasing day by day. However, the shortage of non-renewable energy (such as: coal, oil, natural gas, etc.) and the environmental pollution caused by its excessive use have become one of the bottlenecks restricting the sustainable development of the economy and the improvement of the living environment. Therefore, the utilization of renewable energy (for example: solar energy, tidal energy, wind energy, etc.) has been highly valued. However, the renewable energy power generation process is easily affected by external factors such as temperature, time, season, etc., resulting in obvious discontinuity and instability in the power gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L79/08C08G73/10H01M8/1039H01M8/1069H01M8/1086
CPCC08J5/2256C08J5/2287C08G73/1067C08G73/1003C08J2379/08H01M50/411Y02E60/10Y02P20/54
Inventor 张亚萍李劲超龙俊段浩胥文杰刘军汪妍林罗欢
Owner SOUTHWEAT UNIV OF SCI & TECH
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