Fluorine-containing crosslinking ionic membrane reinforced by fibre and preparation method thereof

Abstract

The invention relates to a fluorine-containing ionic membrane reinforced by double crosslinking fibre and a preparation method thereof, which belong to the field of functional high molecular composite materials. In the full-fluorine ion exchange membrane, full-fluorine ion exchange resin is used as membrane-forming resin, reinforcement fibre is added, a triazine ring chemical bonding cross-linkedstructure is formed between the full-fluorine ion exchange resin, and an acid radical on the chemical bonding cross-linked structure and an added high-valence metal compound are physically bonded so as to form a crosslinking double-network structure. The fluorine-containing ion exchange membrane prepared by the invention has higher protonic electric conductivity and higher mechanical property.

Description

technical field [0001] The invention belongs to the field of functional polymer composite materials, and relates to a fiber-reinforced perfluorinated cross-linked ion membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy into electrical energy by electrochemical means, and is considered to be the preferred clean and efficient power generation technology in the 21st century. Proton exchange membrane (proton exchange membrane, PEM) is the key material of proton exchange membrane fuel cell (proton exchange membrane fuel cell, PEMFC). [0003] The currently used perfluorosulfonic acid proton exchange membrane has good proton conductivity and chemical stability at lower temperature (80°C) and higher humidity. However, they also have many defects: such as poor dimensional stability, low mechanical strength, and poor chemical stability. The water absorption ra...

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Problems solved by technology

However, they also have many defects: such as poor dimensional stability, low mechanical strength, poor chemical stability, etc.

[0009] US20070031715 describes the cross-linking method of sulfonyl chloride cross-linking to generate sulfonyl anhydride. The sulfonyl anhydride cross-linking structure formed in this method can effectively improve the mechanical strength of the membrane, but the cross-linking structure has obvious disadvantages: sulfonyl chloride Anhydride units are unstable to bases

Generally speaking, when the ion exchange capacity increases, the equivalent value of the perfluoropolymer decreases (the equivalent value EW value decreases, the ion exchange capacity IEC=1000 / EW), and the strength of the membrane also decreases, and the membrane strength Gas permeability also increases, which will have a very serious impact on the fuel cell

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