Novel low-resistance ionic conduction membrane for chlor-alkali industry and preparation method thereof

Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a novel low-resistance ion conduction membrane for the chlor-alkali industry and a preparation method thereof. The low-resistance ion conduction membrane consists pf a first perfluorosulfonic acid-perfluorocarboxylic acid polymer composite layer, a second perfluorosulfonic acid-perfluorocarboxylic acid polymer composite layer, a perfluoropolymer reinforcing net and a functional surface coating, wherein the functional surface coating is of a porous rough structure formed by a mixture of a perfluorinated ionic polymer and a metal oxide; and the perfluoropolymer reinforcing net is formed by compounding and weaving a non-woven polymer and protein fibers. According to the novel low-resistance ionconduction membrane, a small amount of perfluorocarboxylic acid is added into the perfluorosulfonic acid layer so that the current efficiency of the membrane is improved, and the membrane resistanceis reduced by adding a small amount of perfluorosulfonic acid into the perfluorocarboxylic acid layer; the perfluoropolymer reinforcing net is adopted as a reinforcing material, so that the membrane resistance is reduced; the dosage of inorganic oxides or fluorine-containing particles in a traditional coating is reduced, and the resistance of the composite membrane body is reduced, facilitating rapid ion transmission.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membranes, and in particular relates to a novel 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, etc. 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 power generatio...

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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.

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