Polytetrafluoroethylene fiber screen cloth and manufacture method of polytetrafluoroethylene fiber screen cloth

Abstract

The invention relates to polytetrafluoroethylene fiber screen cloth and a manufacture method of the polytetrafluoroethylene fiber screen cloth and belongs to the technical field of polytetrafluoroethylene industry. The polytetrafluoroethylene fiber screen cloth is woven by using polytetrafluoroethylene fibers as warp yarns and weft yarns, in addition, the screen cloth is in a one-warp two-weft structure, the weft yarns are staggered on the basis of the warp yarns, the warp yarns and the weft yarns of the screen cloth are respectively twisted by single wires, the twisting degree is 700 to 1000 twists / m, the weft yarn fiber width of the screen cloth is 220 to 230mum, the warp yarn fiber width is 130 to 160mum, and the fineness of the warp yarn fibers and the weft yarn fibers is 80 to 100 Deniers. The polytetrafluoroethylene fiber screen cloth provided by the invention is specially designed for ion exchange membranes and is particularly suitable for being used as framework materials of the ion exchange membranes. Resin copolymers are coated on the screen cloth, coatings are uniform and thin, and the coatings and a screen cloth framework are firmly bonded. The manufactured ion exchange membranes have good proton passing performance and no permeability, and have the advantages that the dimensional stability is high, and the intensity is high.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene fiber mesh cloth and a manufacturing method thereof, in particular to a polytetrafluoroethylene fiber mesh cloth used for preparing a perfluorosulfonic acid ion exchange membrane and a manufacturing method thereof, and belongs to the technical field of the polytetrafluoroethylene industry. Background technique [0002] The positive electrode reaction of the fuel cell often produces a large number of hydroxyl radicals, which will attack the non-fluorine groups on the film-forming resin molecules, resulting in chemical degradation, damage and foaming of the film. As a result, the proton conductivity of the membrane drops sharply, which greatly reduces the efficiency of the fuel cell. What's more serious, the existing perfluorosulfonic acid ion exchange membranes all have a certain degree of hydrogen or methanol permeability, especially in methanol fuel cells, the methanol permeability is very high, which...

AI Technical Summary

Problems solved by technology

Since the ion exchange membrane is made by filling the perfluorosulfonic acid resin on the microporous membrane, the microporous membrane itself is very fine and dense, so it is difficult for the perfluorosulfonic acid resin to fill the microporous membrane completely.

To fill completely, it is inevitable that the filling layer is too thick. Too thick filling layer will affect the passability of protons and affect the efficiency to a certain extent. Attack the skeleton material of perfluorosulfonic acid ion exchange membranes, such as microporous membranes, resulting in chemical degradation, damage and foaming of the membranes

Images