Novel ultra-thin low-resistance ion-conducting membrane for chlor-alkali industry and preparation method thereof

Abstract

The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a novel ultra-thin and low-resistance ion-conducting membrane for the chlor-alkali industry and a preparation method thereof. It consists of a first perfluorocarboxylic acid-perfluorosulfonic acid polymer composite layer, a second perfluorocarboxylic acid-perfluorosulfonic acid polymer composite layer, a porous non-woven polymer layer and a functional surface coating; wherein the functional surface The coating is a porous and rough structure composed of a mixture of perfluoroionic polymers and metal oxides. In the novel ultra-thin low-resistance ion-conducting membrane for chlor-alkali industry of the present invention, a small amount of perfluorocarboxylic acid is added to the perfluorosulfonic acid layer to improve the current efficiency of the membrane, and a small amount of perfluorocarboxylic acid is added to the perfluorocarboxylic acid layer Fluorosulfonic acid reduces the membrane resistance; the ultra-thin porous non-woven polymer layer is used as a reinforcing material, which greatly reduces the thickness of the membrane and reduces the membrane resistance; reduces the use of inorganic oxides or fluorine-containing particles in traditional coatings, and reduces Composite film bulk resistance is conducive to fast ion transport.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a novel ultra-thin and low-resistance ion-conducting membrane for the chlor-alkali industry and a preparation method thereof. Background technique [0002] The chlor-alkali industry is the basic industry of the national economy. Its products are widely used in various fields of the national economy such as agriculture, petrochemical industry, light industry, textile, chemical building materials, electric power, national defense, and military industry. It plays a pivotal role in my country's economic development. However, the chlor-alkali industry is a high-energy-consuming industry in my country's petroleum and chemical industries, which is mainly reflected in the power consumption of caustic soda production. In 2013, the national caustic soda consumed about 66.5 billion Kw h of alternating current, accounting for about 1.27% of the country's total powe...

AI Technical Summary

Problems solved by technology

2. Polymer materials have good toughness, and breaking them into nano-scale sizes requires low-temperature crushing technology. The manufacturing cost is very expensive and it is difficult to mass produce

4. Perfluorosulfonic acid resin is an ion exchange resin, and its deformation size will change greatly in different temperatures and solution environments. The working conditions are more complicated during the electrolysis process, and the perfluororesin particles are easy to fall off.

Images