Method for preparing proton exchange film based on con-radiation technology

Abstract

The invention relates to a preparation method of a proton exchange membrane, in particular to a preparation method of the proton exchange membrane based on co-radiation technology. The preparation method pertains to the technical field of high polymer materials. The preparation method comprises the following steps: co-radiation grafting is achieved among a polymer basement membrane, a monomer p-styryl trimethoxysilane and divinylbenzene by adopting the co-radiation grafting method; the sulfonation is carried out to the radiation grafting membrane; and the target product, namely the proton exchange membrane, is formed by the hydrolysis-polycondensation reaction between the sulfonated membrane and the hydrochloric solution. The proton exchange membrane obtained by the method is introduced with base group which forms strong chemical bonds with the polymer basement membrane and has water holding function, thus improving the water holding performance and the mechanical strength of the membrane and having better size stability and proton conductivity. For the co-radiation grafting method provided by the invention, a chemical initiating agent is not required and the co-radiation grafting method can be finished under room temperature, the performance of the membrane can be improved and the grafting rate of the reaction can be controlled by adjusting such parameters as the irradiation dose, dose rate, the monomer concentration and so on. Therefore, the co-radiation grafting method is an effective method for preparing the proton exchange membrane with high quality, homogeneous phase and low cost.

Description

technical field [0001] The invention relates to a method for preparing a proton exchange membrane, in particular to a method for preparing a proton exchange membrane based on co-radiation technology, and belongs to the field of polymer materials. Background technique [0002] A fuel cell is a device that converts chemical energy into electrical energy. It uses hydrogen, natural gas, coal gas or methanol and other non-petroleum fuels to undergo oxidation-reduction reactions at the two poles of the battery with pure oxygen or air to provide direct current for the environment. According to the electrolyte in fuel cells, fuel cells can be roughly divided into alkaline fuel cells (AFC), phosphoric acid fuel cells (PAFC), solid oxide fuel cells (SOFC), molten carbonate fuel cells (MCFC) and Proton Exchange Membrane Fuel Cell (PEMFC). Among them, the proton exchange membrane fuel cell has the advantages of low operating temperature, fast start-up, high output specific power, and ...

AI Technical Summary

Problems solved by technology

The proton exchange membrane of the present invention has high moisturizing performance and dimensional stability, but the inorganic component palygorskite-sepiolite group mineral fiber is incompatible with the proton exchange resin solution, and it is difficult to achieve good dispersion

Another example is the invention patent of Xinyuan Power Co., Ltd. "a carbon nanotube-reinforced self-humidifying composite proton exchange membrane and its preparation" ([application number] 200610134078.8), which uses a solution casting method to obtain carbon nanotube-reinforced perfluorosulfur Acid resin membrane, and then introduce Pt into the membrane as a self-humidifying catalyst, wherein Pt is loaded on carbon nanotubes to obtain a composite proton exchange membrane with good strength and self-humidification, but carbon nanotubes loaded with inorganic components Pt are easy Agglomeration, affecting performance, at the same time, the price of perfluorosulfonic acid resin, Pt and carbon nanotubes used is still high

"A preparation method for core components of water-retaining proton exchange membrane fuel cells" invented by Wuhan University of Technology ([Application No.] 200710051758.8), first adjust the pH value of the proton-conducting polymer solution with NaOH, add anhydrous organic solvent, and then distill, The inorganic oxide precursor is added to the distilled solution and stirred to obtain a proton-conducting polymer modified with inorganic oxide nanoparticles, and a fuel cell core component with good water retention capacity is prepared, but there are still nanoparticles that are easy to agglomerate. Difficult to control particle size

The organic-inorganic phase of the proton exchange membrane obtained by the above method is mainly combined by weak interactions such as physical adsorption, hydrogen bond or van der Waals force. In the application of fuel cells, due to penetration or diffusion, the inorganic components are easily transported from The organic polymer phase is separated, and the weak interfacial interaction between the organic-inorganic phase will directly affect the structure and performance of the proton exchange membrane