Preparation method and application of fiber with high ion exchange volume and high strength

Abstract

The invention discloses fluororesin with high ion exchange volume and high strength, which is formed by copolymerizing tetrafluoroethylene, ethylene and one or more monomers having the structure of the general formula (I) (disclosed in the specification), wherein in the general formula (I), a is equal to 0-5, b is equal to 0-5, the summation of a and b is not equal to 0, and n is equal to 0-2; Rfand Rf' are selected from -F, -Cl, -Br or -CzF2z, and z is equal to 1-5; A is -PO(OR1)(OR2); and R1 and R2 are selected from -H, -CmH2m+1, -Ph and substituted benzene, and m is equal to 1-10. The molecular weight of the fluororesin with high ion exchange volume and high strength is 200-1,500 thousands. Melt spinning is carried out on the fluorine-containing polymer having high ion exchange function and high mechanical strength by adopting corrosion resistant alloy melt spinning equipment to prepare polymer fibers, and then the fibers are woven into a fiber net having the ion exchange functionby using a weaving technology. The fiber net can be used as an enhancement net material of a proton exchange membrane and a chlor-alkali ion membrane to achieve the purpose of simultaneously improving the strength of the membrane materials, increasing the adhesion force of the fibers and the membranes and improving the ion exchange capacity.

Description

technical field The invention belongs to the field of fluorine-containing polymer materials, and relates to a class of fluorine resin with high ion exchange function and high mechanical strength and its application as ion exchange membrane reinforcement material. Background technique Since DuPont processed perfluorosulfonic acid resins into perfluorosulfonic acid ion exchange membranes in the 1970s and this membrane was used in the chlor-alkali industry and proton exchange membrane fuel cells, the application of perfluorinated ion exchange membranes has been widely used in countries all over the world. extensive research. Whether perfluorinated ion exchange membranes are used in the chlor-alkali industry or in fuel cells, the currently known technologies need to be reinforced with reinforcing skeleton materials. Whether they are reinforced with microporous materials or fiber reinforced, these reinforcing materials are nothing more than PTFE. Ethylene, fusible polytetrafluor...

AI Technical Summary

Problems solved by technology

At present, many studies have made ETFE functional by high-energy ray irradiation. One disadvantage of this irradiation method is that the location and number of C-C bond breaks are uncontrollable during the irradiation process. The mechanical properties of the material itself, Reduced heat resistance, chemical resistance, and durability

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