Preparation method of ultra-thin enhanced proton exchange membrane

Abstract

The invention relates to a preparation method of an ultra-thin enhanced proton exchange membrane, which is characterized by comprising the following steps of: (1) pretreatment: firstly, immersing a PTFE millipore membrane in a low carbon alcohol solution for 2-10 hours, and then, irradiating the millipore membrane with ultraviolet rays for 1-4 hours; (2) compounding: compounding under a vacuum condition and in a heating state, spraying a sulfoacid resin solution to the PTFE millipore membrane, seeping into millipores, and forming a proton exchange membrane by the PTFE milipores and sulfoacid resin membrane layers on both sides of the PTFE millipore membrane; (3) rolling: hot rolling the primarily formed proton exchange membrane in double rollers, and finally, forming the compact proton exchange membrane. The thickness of the proton exchange membrane is from 4 to 12 mum, the deviation value of non-uniform thickness is from + / -0.2 to + / -0.5 mum, the electrical conductivity is from 0.1 to 0.15 s / cm, and the tensile strength is from 40 to 50 MPa.

Description

Technical field: [0001] The invention relates to a proton exchange membrane, in particular to a preparation method of an ultra-thin reinforced proton exchange membrane. Background technique: [0002] The proton exchange membrane is one of the key components of the proton exchange membrane fuel cell, and its quality is directly related to the performance and service life of the fuel cell. [0003] The ultra-thin perfluorosulfonic acid resin proton exchange membrane is used to conduct protons, and the working principle is based on electrochemistry. On the anode side, hydrogen dissociates on the surface of the anode catalyst to generate protons and electrons, and the protons pass through the sulfonic acid group (-SO 3 H) Transfer to the cathode, and the electrons reach the anode through the external circuit load, thus forming a complete electrical circuit to supply power to the outside world. The proton exchange membrane made of sulfonic acid resin is an important focus of re...

AI Technical Summary

Problems solved by technology

But its strength is not high, and it is expensive

In order to improve its strength and reduce the amount of sulfonic acid resin to reduce the cost, a polytetrafluoroethylene film is used as the base frame, and the sulfonic acid resin is compounded on this membrane to make a reinforced proton exchange membrane and mass-produced, but the price is still expensive, and There is also the disadvantage of large thickness, and its thickness is generally above 20 μm

There are also units in China that develop perfluorosulfonic acid resin proton exchange membranes. However, the problems of domestic proton exchange membranes are low conductivity, generally below 0.12s / cm; low tensile strength, generally 26Mpa

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