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Proton exchange membrane and preparation method thereof

A proton exchange membrane and microporous membrane technology, applied in the field of hydrogen fuel cells, can solve problems such as poor compatibility and easy loss of additives, and achieve the effects of improving water retention capacity, improving compatibility, and repairing internal defects

Pending Publication Date: 2022-01-07
CHINA AUTOMOTIVE INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of reinforced proton exchange membrane and preparation method thereof, solve the problems such as poor compatibility of sulfonic acid resin and expanded polytetrafluoroethylene (ePTFE) microporous membrane and easy loss of additives, etc. The surface modification of the porous membrane, on the one hand, improves the hydrophilicity of the ePTFE microporous membrane, on the other hand, increases the content of the water-retaining agent and the stability in the proton exchange membrane

Method used

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  • Proton exchange membrane and preparation method thereof
  • Proton exchange membrane and preparation method thereof
  • Proton exchange membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] This embodiment prepared perfluorosulfonic acid resin / SiO 2 - ePTFE microporous membrane proton exchange membrane, the specific method is as follows:

[0030] 1) Cut a 15*15cm ePTFE microporous membrane with a thickness of 15μm, a pore diameter of about 0.25μm, a porosity of 85%, a tensile strength of 35Mpa, and no wrinkles or damage on the surface. Place it in a special fixture and transfer it to the plasma equipment (OKSUN-RTR1000L-W600A). A vacuum pump is used to make the vacuum degree reach 10pa, and the radio frequency power is 100W; a mixed gas of argon and oxygen is used, and the gas flow rate is 50ml / min; the processing time is 300s. Finally, the primary treatment product is obtained, which is denoted as HO-ePTFE microporous membrane;

[0031] 2) Immediately transfer the treated HO-ePTFE microporous membrane to the atomic layer deposition instrument, choose SiCl 4 Alternate pulses with deionized water as a precursor into the reaction chamber for atomic layer ...

Embodiment 2

[0035] This embodiment prepared perfluorosulfonic acid resin / TiO 2 - ePTFE microporous membrane proton exchange membrane, the specific method is as follows:

[0036] 1) Cut a 15*15cm ePTFE microporous membrane with a thickness of 15μm, a pore diameter of about 0.25μm, a porosity of 85%, a tensile strength of 35Mpa, and no wrinkles or damage on the surface. Place it in a special fixture and transfer it to the plasma equipment middle. A vacuum pump is used to make the vacuum degree reach 10pa, and the radio frequency power is 100W; a mixed gas of argon and oxygen is used, and the gas flow rate is 50ml / min; the processing time is 300s. Finally, the primary treatment product is obtained, which is denoted as HO-ePTFE microporous membrane;

[0037] 2) Immediately transfer the treated HO-ePTFE microporous membrane to the atomic layer deposition instrument, choose TiCl 4 Alternate pulses with deionized water as a precursor into the reaction chamber for atomic layer deposition. Set...

Embodiment 3

[0041] This embodiment prepared perfluorosulfonic acid resin / SiO 2 / TiO 2 - ePTFE microporous membrane proton exchange membrane, the specific method is as follows:

[0042] 1) Cut a 15*15cm ePTFE microporous membrane with a thickness of 15μm, a pore diameter of about 0.25μm, a porosity of 85%, a tensile strength of 35Mpa, and no wrinkles or damage on the surface. Place it in a special fixture and transfer it to the plasma equipment middle. A vacuum pump is used to make the vacuum degree reach 10pa, and the radio frequency power is 100W; a mixed gas of argon and oxygen is used, and the gas flow rate is 50ml / min; the processing time is 300s. Finally, the primary treatment product is obtained, which is denoted as HO-ePTFE microporous membrane;

[0043] 2) Immediately transfer the treated HO-ePTFE microporous membrane to the atomic layer deposition instrument, choose SiCl 4 / TiCl 4 (mass ratio 1:1) and deionized water as precursors alternately pulsed into the reaction chamber...

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Abstract

The invention discloses a proton exchange membrane which comprises sulfonic acid resin, an expanded polytetrafluoroethylene microporous membrane and a sulfonic acid resin sandwich structure, the expanded polytetrafluoroethylene (ePTFE) microporous membrane is subjected to SiO2 and / or TiO2 hydrophilic modification, and the surface of the expanded polytetrafluoroethylene (ePTFE) microporous membrane comprises a SiO2 and / or TiO2 membrane formed by atomic layer deposition. The preparation method of the proton exchange membrane comprises the following steps: firstly, carrying out plasma treatment on an ePTFE microporous membrane, then depositing SiO2 and / or TiO2 on the surface of the ePTFE microporous membrane by utilizing atomic layer deposition, finally coating two surfaces of the hydrophilic ePTFE microporous membrane with a sulfonic acid resin solution, and carrying out infiltration and curing to form the membrane. According to the proton exchange membrane disclosed by the invention, the ePTFE microporous membrane is subjected to SiO2 / TiO2 hydrophilic modification, so that the compatibility of the ePTFE microporous membrane and sulfonic acid resin is improved, and meanwhile, the water retention capacity and the mechanical property of the proton exchange membrane are improved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen fuel cells, and relates to a proton exchange membrane modified by expanded polytetrafluoroethylene microporous membrane and a preparation method thereof. Background technique [0002] At present, the enhanced proton exchange membrane is mainly composed of perfluorosulfonic acid ion exchange resin (PFSA) that conducts protons and a reinforcing layer that supports PFSA sulfonic acid resin, and commonly used expanded polytetrafluoroethylene (ePTFE) microporous membrane. The preparation of mass-produced products is usually prepared with a mixed solution of sulfonic acid resin and directly coated on the surface of the ePTFE microporous membrane on both sides. Sandwich-like structure, such as figure 1 shown. Wherein, the mixed solution of sulfonic acid resin includes sulfonic acid resin, water retaining agent, free radical quencher, solvent and the like. [0003] The sulfonic acid resin solution inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0245H01M8/0239H01M8/02
CPCH01M8/0245H01M8/0239H01M8/02Y02E60/50
Inventor 刘冬安张运搏赵玉会程晓草李文瑞
Owner CHINA AUTOMOTIVE INNOVATION CORP
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