High temperature resistant alkaline water electrolytic cell barrier diaphragm and preparation thereof

Abstract

The invention provides a diaphragm for a high temperature resistance alkaline water electrolyser, which is a needle-punched non-woven polyphenyl thioether diaphragm. The method for preparing the diaphragm comprises the following steps: (1) fibrous material selecting: PPS fiber is selected to prepare non-woven base cloth; (2) web carding: the fibrous material is carded into a web by a carding machine by opening and mixing; (3) web lapping: a carded single-web is manufactured into a multi-layer fibrous web with required width and thickness by lapping the web by a lapping machine; (4) strengthening: reinforced materials of the lapped multi-layer fibrous web are fed into a needle machine to manufacture a non-woven cloth with certain strength by pre-needling and multiple main needling on front side and back side; (5) post-treatment: sulfonating treatment is carried out on the non-woven cloth in 90 to 98 percent of H2SO4, and then is treated by 30 percent of potassium hydroxide solution. The preparation method has the advantages of simple process, clearness and definitude, easy industrialized implementation, convenient operation and low cost; furthermore, the preparation method has easy process control so as to ensure stable performance of the product and stable quality.

Description

technical field [0001] The invention relates to a water electrolyzer diaphragm and a preparation method thereof, in particular to a high temperature resistant alkaline water electrolyzer diaphragm and a preparation method thereof. Background technique [0002] With the development of technology and economy and the growth of population, people's demand for energy is increasing. The current fossil fuels represented by oil and coal, on the one hand, have brought serious environmental pollution, and on the other hand, due to their non-renewability and limited reserves, they will bring about a serious energy crisis. Therefore, it is more and more urgent to develop clean and renewable new energy. Hydrogen is regarded as the most ideal energy carrier due to its advantages of cleanness, pollution-free, high efficiency, storage and transportation. As a flammable gas, hydrogen is not only used as a pollution-free energy source, but also used in many fields such as electronics, milit...

AI Technical Summary

Problems solved by technology

[0008] Italian patent 24836A / 80 introduces a diaphragm coated with sulfonated PPS as a hydrophilic modification based on PTFE fabric. This diaphragm has good corrosion resistance, but its production process is relatively complicated and requires high temperature and high pressure Rolling, the size of the diaphragm is limited, the uniformity is poor, and because the PTFE used in it has a small surface energy, it is difficult to be bonded, and the thermal expansion coefficient of it is different from that of the PPS material, so the diaphragm is easy to delaminate when heated

[0009] U.S. Patent US4895634 uses pure polyphenylene sulfide fibers to make woven fabrics or non-woven felts, and uses different methods (sulfonation, carbonylation, phosphorylation) for hydrophilic modification. According to the patent, its diaphragm performance is excellent. Temperature and corrosion resistance, water absorption rate 300%, gas purity up to 99.99%; but its diaphragm thickness is relatively large (about 2mm), its hydrophilic post-treatment process is more complicated, and the time is longer (about 2h), and its patent is not Point out the diaphragm processing technology

[0010] At present, it is the first time in China to use needle-punched nonwoven polyphenylene sulfide (PPS) diaphragm, and the relevant content of its preparation method has not been published.