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Nano composite moisture-permeable film and preparation method and application thereof

A nano-composite, moisture-permeable membrane technology, applied in nanotechnology, nanotechnology, semi-permeable membrane separation and other directions, can solve the problems of high cost, poor dispersion performance, easy to agglomerate, etc. Low-cost, easy-to-operate effects

Active Publication Date: 2017-08-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the micron structure of the dispersed phase fibers, it is easy to agglomerate during processing, so the dispersion performance is poor
In addition, due to the use of Nafion as the base material, the cost of the moisture-permeable membrane is relatively high

Method used

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  • Nano composite moisture-permeable film and preparation method and application thereof
  • Nano composite moisture-permeable film and preparation method and application thereof
  • Nano composite moisture-permeable film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A nanocomposite moisture-permeable membrane is prepared from the following components and contents in parts by weight:

[0042]

[0043] Concrete preparation process is as follows:

[0044] 1. Preparation of nanocellulose: Add 28g of micron cellulose to 300mL of sulfuric acid solution with a mass fraction of 64%, and stir until no lumps are formed; stir at 44°C for 1.5h; dilute with distilled water and centrifuge to remove the supernatant , repeated dilution and centrifugation until the upper layer became turbid, and collected the turbid liquid containing nanocellulose in the upper layer; dialyzed until pH = 7, and freeze-dried.

[0045] 2. Modification of nanocellulose: Dry the prepared nanocellulose in a vacuum oven at 80°C for 12 hours, then disperse it in a mixture of ethanol and water (ethanol:water=9:1), and add a mass fraction of 1 % KH550, then stirred at 60°C for 9h, washed repeatedly with deionized water and ethanol three times, and then dried in a vacuum ...

Embodiment 2

[0054] A nanocomposite moisture-permeable membrane is prepared from the following components and contents in parts by weight:

[0055]

[0056] Concrete preparation process is as follows:

[0057] 1. Modification of nano-potassium titanate whiskers: dry the nano-potassium titanate whiskers in a vacuum oven at 80°C for 24 hours, then slowly add them to an aqueous solution with a KH550 content of 1%, and slowly stir at 30°C for several minutes , and then heated to 80°C, stirred for 12h, washed with deionized water, and then dried at 110°C for 12h.

[0058] 2. Preparation of nano-potassium titanate whiskers / cross-linked polyvinyl alcohol composite film: dissolve 0.5g polyvinyl alcohol in 25mL deionized water at 95°C, let stand overnight for defoaming; slowly add 0.57g of supernatant ammonium sulfate and 0.38g of N,N-methylenebisacrylamide, and stir evenly, then add the modified nano-potassium titanate whiskers with a mass fraction of 10%, and ultrasonically disperse to prepar...

Embodiment 3

[0060] A nanocomposite moisture-permeable membrane is prepared from the following components and contents in parts by weight:

[0061]

[0062] 1. Modification of nano-calcium sulfate whiskers: dry nano-calcium sulfate whiskers in a vacuum oven at 80°C for 24 hours, then disperse them in ethanol, add stearic acid with a mass fraction of 1.5%, and stir at 90°C for 30 minutes, Then wash with absolute ethanol, and then dry at 110°C.

[0063] 2. Preparation of sulfonated polybenzimidazole: Add 170g of solvent polyphosphoric acid into a dry 250mL three-necked flask, and then add 5g of water-absorbing agent P 2 o 5 . Assemble the device, ventilate with nitrogen, turn on the mechanical stirring, and at the same time raise the temperature to 120°C to remove all the air in the three-necked flask. Keep warm for 90min, wait for P 2 o 5 After completely dissolving in polyphosphoric acid, accurately weigh 13mmol (2.8136g) of 3,3',4,4'-biphenyltetramine and 13mmol (3.5574g) of 2-sul...

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Abstract

The invention relates to a nano composite moisture-permeable film and a preparation method and application thereof. The moisture-permeable film is prepared from the following components in parts by weight: 100 parts of a hydrophilic polymer, 3-30 parts of a hydrophilic nanomaterial and 0.02-2 parts of a nanomaterial-modified material, wherein the crystallinity of the hydrophilic nanomaterial is 40-70% and the length-diameter ratio is 20-100. A hydrophilic polymer solution and a modified hydrophilic nanomaterial are prepared separately during preparation, and then mixed; and the nano composite moisture-permeable film is used for a humidifying system of a fuel cell. Compared with the prior art, the nano composite moisture-permeable film which is high in water flux, low in gas permeability, high in strength an low in cost is prepared by bending and compounding the hydrophilic polymer as a continuous phase and the modified hydrophilic nanomaterial as a disperse phase; and the nano composite moisture-permeable film is suitable for a gas humidifying system of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials and electrochemistry, and relates to a nanocomposite moisture-permeable membrane, a preparation method and application thereof. Background technique [0002] A fuel cell is a high-efficiency power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy. Since the fuel does not pass through the heat engine process, it is not limited by the Carnot cycle, and has a high energy conversion rate and is environmentally friendly. It is precisely because of these outstanding advantages that the research and development of fuel cell technology has attracted the attention of governments and large companies, and is considered to be the preferred clean and efficient power generation technology in the future. [0003] Among them, the proton exchange membrane fuel cell is a fuel cell using a proton exchange polymer as an electrolyte. Proton ex...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D69/12B01D67/00H01M8/04276B82Y30/00
CPCB01D67/0079B01D69/125B01D71/76B82Y30/00H01M8/04276Y02E60/50
Inventor 常志宏田静晏晖潘海燕
Owner TONGJI UNIV
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