Hole-containing fiber reinforced ion exchange membrane for chlor-alkali industry and preparation method thereof
An ion-exchange membrane and fiber-reinforced technology, applied in the direction of diaphragm, electrolysis process, electrolysis components, etc., can solve the problems of reducing the mechanical strength of the membrane and the decrease of membrane strength, and achieve the effects of avoiding textile conditions, reducing cell voltage, and reducing transfer resistance
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Embodiment 1
[0038] The perfluorosulfonic acid resin in this example is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, and its ion exchange capacity is 0.95mmol / g.
[0039] (1) Preparation of resin pellets
[0040] Calcium carbonate with an average particle size of 25 nanometers and the above-mentioned perfluorosulfonic acid resin powder are fully mixed at a mass ratio of 4:100, then melt-extruded and granulated to obtain pellets of perfluorosulfonic acid resin containing inorganic sacrificial materials.
[0041] The powder obtained by copolymerization of tetrafluoroethylene and perfluoro4,7-dioxa-5methyl-8-nonenoate methyl ester has an ion exchange capacity of 0.94mmol / g, and is granulated by melt extrusion to obtain perfluorocarboxylate Pellets of acid resin.
[0042] (2) Membrane preparation and reinforcement
[0043] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid r...
Embodiment 2
[0048] The perfluorosulfonic acid resin in this example is a powder obtained by copolymerization of tetrafluoroethylene, hexafluoropropylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, and its ion exchange capacity is 0.98mmol / g.
[0049] (1) Preparation of resin pellets
[0050] Calcium carbonate with a particle size of 80±10 nanometers and the above-mentioned perfluorosulfonic acid resin powder are fully mixed at a mass ratio of 20:100, and then melt-extruded and granulated to obtain pellets of perfluorosulfonic acid resin containing inorganic sacrificial materials.
[0051] The powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5methyl-8-nonenoate methyl ester has an ion exchange capacity of 0.93mmol / g, and is granulated by melt extrusion to obtain perfluorocarboxylate Pellets of acid resin.
[0052] (2) Membrane preparation and reinforcement
[0053] Using the above-mentioned perfluorocarboxylic acid resin pellets and perf...
Embodiment 3
[0058] Step (1), step (2) and step (3) are the same as in Example 1, except that the average particle size of calcium carbonate in step (1) is 55±10 nm.
[0059] The prepared ion membrane tensile strength of the present embodiment is 31MPa, can be used for the ion exchange membrane in the chlor-alkali ion membrane electrolyzer, at 4.5kA / m 2 Under the conditions of current density of 32% by mass ratio of cathode NaOH solution, 305g / L brine concentration of anode brine entering the tank, 210g / L NaCl concentration of brine leaving the tank, tank temperature of 85-87°C, active cathode, and 1mm pole distance Test, the cell voltage is 3.10-3.13V, and the cathode alkali current efficiency is 96.7%.
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