A kind of organic-inorganic hybrid cation exchange membrane and preparation method thereof

Abstract

The invention discloses an organic and inorganic hybrid cation exchange membrane and a preparation method thereof, and relates to cation exchange membranes. A base membrane body is cleaned and dried to a constant weight and placed in an irradiation chamber, and pre-radiation is conducted by using high-energy rays; a graft reaction is performed on the pre-radiated membrane, a cross-linking agent isused for carrying out a cross-linking reaction, and inorganic groups are introduced; a sulfonation reaction is conducted on the membrane by using a sulfonation agent, sulfonic acid groups are introduced, and then hydrolysis is conducted by using an alkali solution to obtain the organic and inorganic hybrid cation exchange membrane. The organic and inorganic hybrid cation exchange membrane has good thermal stability, chemical stability, dimensional stability, a relatively high water content and good mechanical properties. The organic and inorganic hybrid cation exchange membrane is low in cost, simple in process, high in controllability and easy to popularize and industrialize.

Description

technical field [0001] The invention relates to a cation exchange membrane, in particular to an organic-inorganic hybrid cation exchange membrane and a preparation method thereof. Background technique [0002] The cation exchange membrane is a film with selective permeation to cations, which can selectively pass cations and block anions. Capacitors and other fields have a wide range of uses. [0003] As a high-efficiency and environmentally friendly power generation device, the fuel cell does not go through the heat engine process and is not limited by the Carnot cycle. It has high energy conversion efficiency, no noise, and low pollution. It is considered to be the first after thermal power, hydropower, and nuclear power. Four generations of power generation technology. The proton exchange membrane is the key material of the proton exchange membrane fuel cell, which plays the role of conducting protons and separating the anode and cathode. The most commonly used proton e...

AI Technical Summary

Problems solved by technology

The most commonly used proton exchange membrane is still the Nafion membrane (perfluorosulfonic acid type membrane) of U.S. DuPont Company so far. This type of membrane has the advantages of high proton conductivity and good chemical stability, but the Nafion series membrane also has the following disadvantages: ( 1) Difficult to make and high cost

The optimum working temperature of Nafion series membranes is 70-90°C. If the temperature exceeds this temperature, the water content will drop sharply, resulting in a rapid drop in conductivity. It is difficult to increase the electrode reaction speed and overcome the problem of catalyst poisoning by properly increasing the working temperature.

(3) For some hydrocarbon fuels, such as methanol, etc., the permeability is high, and it is not suitable for use as a proton exchange membrane for direct methanol fuel cells

[0006] Patent CN102333815A discloses a radiation grafted copolymer film, which is to co-graft styrene and methacrylonitrile (MAN) on the ethylene-tetrafluoroethylene copolymer (ETFE) base film, wherein methacrylonitrile has protected α position and strong dipole nitrile side group, the results of battery tests show that it has better chemical stability, but when the polymer-monomer hybrid system is irradiated at the same time, the homopolymerization of the monomer must occur , which reduces the grafting efficiency and requires additional steps to remove homopolymers

Patent WO2015022021 discloses a proton exchange membrane with good stability by grafting ETFE membrane with 4-vinylpyridine by radiation through low radiation, and then doping the product with phosphoric acid in a solution of isopropanol. And it can increase the battery operating temperature from 80°C to 120°C, but the conductivity of the proton exchange membrane prepared by this method is poor

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