Novel ionic conduction membrane and preparation method thereof

Abstract

The invention belongs to the technical field of ionic membranes, and particularly relates to a novel ionic conduction membrane. The novel ionic conduction membrane comprises a perfluoro ion exchange resin basal membrane, a porous reinforcing material and a surface layer made of a mixture of perfluoro ion exchange resin microparticle and inorganic compound particle, wherein the inorganic compound particle is one of or a mixture of oxides, hydroxides and nitrides of IV-A groups, IV-B groups, V-B groups, iron, cobalt, nickel, chromium, manganese or boron elements; and the perfluoro ion exchange resin microparticle is a mixture of one or two of perfluoro carboxylic acid resin microparticle or perfluoro sulfonic acid carboxylic acid copolymerization resin microparticle and perfluoro sulfonic acid resin microparticle. The novel ionic conduction membrane is used for the chlorine-alkali industry and is capable of stably and efficiently treating an alkali chloride solution wide in concentration range and suitable for operation in a novel zero-polar-distance electrolytic bath under the condition of high electric current density, and the product is high in purity. The invention also provides a preparation method of the novel ionic conduction membrane, which is simple and reasonable in process and facilitates industrial production.

Description

technical field [0001] The invention belongs to the technical field of ion membranes, and in particular relates to a novel ion conduction membrane and a preparation method thereof. Background technique [0002] In recent years, in the production of chlor-alkali by ion-exchange membrane method, in order to realize electrolysis under the conditions of high current density, low cell voltage and high concentration of lye, in order to achieve the purpose of increasing productivity and reducing power consumption, the key is to shorten the ion-exchange membrane The distance between the electrode and the electrode can be reduced to reduce the cell voltage, so that the narrow pole distance ion membrane electrolysis process can be practical. With the continuous advancement of technology, the zero-electrode distance electrolyzer has been widely used, but when the distance between the electrodes is reduced to less than 2mm, the hydrogen bubbles attached to the membrane surface are diffi...

AI Technical Summary

Problems solved by technology

The hydrophilic coating modification process needs to be mixed with inorganic components and special binders, and then covered on the surface of the ion membrane by electrolytic deposition, particle embedding, etc. Patents CA2446448 and CA2444585 have introduced the coating process in detail ; Although the effect of this modification method is remarkable, the process is relatively complicated

In addition, because the ionic membrane will experience continuous scouring and turbulence caused by the lye flow during the electrolysis operation, the hydrophilic coating attached to the surface of the ionic membrane will gradually fall off, and the anti-foaming function will gradually decrease to ineffective.

[0004] Patent US 4502931 mentions that the surface of the ionic membrane is roughened and modified by ion etching, but this method is not easy to implement in a large area, and the anti-foaming ability is not high. The cell voltage is still greater than 3.5V, and the current efficiency is lower than 90%