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Ionomer dispersion having high dispersion stability, method for producing same, and polymer electrolyte membrane produced using same

A technology of ionomers and dispersions, which is applied in the manufacture of final products, sustainable manufacturing/processing, circuits, etc., can solve the problems of reduced ion conductivity, reduced dispersion stability of dispersions, and hindered ionomer morphology, etc., to achieve Improved ionic conductivity and durability, improved ionic conductivity, and improved dispersion stability

Pending Publication Date: 2022-05-06
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, as the concentration of solids in the dispersion increases, the dispersion stability of the dispersion decreases
[0012] Reinforced composite membrane type polymer electrolyte membranes manufactured from dispersions with insufficient dispersion stability have the problem of high through-plane resistance (i.e., through-plane water channels are not properly formed) due to low impregnation of the dispersion into them
[0013] In addition, the low dispersion stability of the dispersion prevents the ionomer from having a suitable morphology in the polymer electrolyte membrane, resulting in a decrease in the in-plane ionic conductivity of the polymer electrolyte membrane and an increase in the hydrogen permeability of the polymer electrolyte membrane.

Method used

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  • Ionomer dispersion having high dispersion stability, method for producing same, and polymer electrolyte membrane produced using same
  • Ionomer dispersion having high dispersion stability, method for producing same, and polymer electrolyte membrane produced using same
  • Ionomer dispersion having high dispersion stability, method for producing same, and polymer electrolyte membrane produced using same

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preparation example Construction

[0085] The method for preparing the ionomer dispersion of the present invention includes adding the ionomer to a dispersion medium and mixing the dispersion medium with the ionomer.

[0086] As mentioned above, due to the different solubility of the ionomer's hydrophobic backbone and hydrophilic side chains, the ionomer is usually introduced into and coated on the porous support in the form of a dispersion rather than a solution. Therefore, according to the present invention, a dense polymer electrolyte membrane can be produced by adding an ionomer to a dispersion medium such that the ionomer dispersion contains a large amount of ionomer solids of 20% by weight or more.

[0087] However, in order to overcome the problem that the dispersion stability of the dispersion decreases as the concentration of solids in the dispersion increases, a resonant acoustic method is used to mix the dispersion medium with the ionomer.

[0088] Mixing based on resonant acoustic methods can be per...

Embodiment 1a

[0116] A PFSA-based ionomer (EW 725) was added to a dispersion medium in which 1-propanol and water were mixed in a weight ratio of 55:45 so that the ionomer solid content was adjusted to 20% by weight. Then, use a mixer (Resodyn AcousticMixers, Inc., LabRAM II) to cause resonance with an acceleration of 90G at room temperature and humidity for 20 minutes to mix the dispersion medium with the ionomer (that is, use a resonant acoustic method to mix) to prepare the ionomer. polymer dispersion.

Embodiment 2a

[0118] A PFSA-based ionomer (EW 725) was added to a dispersion medium in which 1-propanol and water were mixed in a weight ratio of 30:40, so that the ionomer solid content was adjusted to 30% by weight. Then, the dispersion medium was mixed with the ionomer by causing resonance at an acceleration of 90 G for 20 minutes at room temperature and humidity using a mixer (Resodyn AcousticMixers, Inc., LabRAM II). Then, high-pressure dispersion of applying a high pressure of 600 bar to the mixture of the dispersion medium and the ionomer using a homogenizer was repeated 3 times to prepare an ionomer dispersion.

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Abstract

Disclosed are: an ionomer dispersion which contains a high content of an ionomer solid and has high dispersion stability, thereby optimizing the form of an ionomer in a polymer electrolyte membrane and improving the ionic conductivity and durability of the polymer electrolyte membrane; the invention discloses a preparation method of an ionomer dispersion. And a polymer electrolyte membrane prepared using the method for preparing the ionomer dispersion.

Description

technical field [0001] The present invention relates to an ionomer dispersion, its preparation method and a polymer electrolyte membrane prepared by using it, more particularly, relates to an ionomer dispersion, its preparation method and a polymer electrolyte membrane prepared by using it, The ionomer dispersion exhibits excellent dispersion stability despite the high ionomer solid content, thereby optimizing the morphology of the ionomer in the polymer electrolyte membrane and improving both the ion conductivity and the durability of the polymer electrolyte membrane. improve. Background technique [0002] An advantage of a fuel cell that generates electricity through a combination between hydrogen and oxygen is that electricity can be continuously generated as long as hydrogen and oxygen are supplied, and the efficiency is about twice that of an internal combustion engine because there is no heat loss. [0003] A fuel cell emits fewer pollutants because it converts the ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1018H01M8/1039H01M8/1067H01M8/1053H01M8/1004H01M8/1048H01M8/1025C08L27/18
CPCH01M8/1018H01M8/1039H01M8/1067H01M8/1053H01M8/1004H01M8/1048H01M8/1025C08L27/18H01M2008/1095Y02E60/50Y02P70/50C08F214/262C09D127/18C08J5/2237C08J2327/18C08F216/1475C08L81/06
Inventor 金娜玲李瞳熏李殷受朴重华廉承辑吴昌勋李蕙松
Owner KOLON IND INC