Ion exchange membrane for ultra-high current density oxygen cathode electrolysis and preparation method thereof
A technology of current density and exchange membrane, which is applied in the field of polymer materials and electrochemistry, can solve the problems of increasing reaction resistance, no catalytic function, and reduced catalytic efficiency, so as to achieve the effect of improving mechanical strength, realizing functions, and improving electrochemical flux
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Embodiment 1
[0054] (1) Preparation of resin pellets
[0055] The perfluorosulfonic acid resin used is the powder obtained by in-situ polymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride in the presence of carbon nanotubes. The capacity is 0.99mmol / g. The carbon nanotubes are (6,6) single-walled tubes with a length of 5-15 microns and a mass content of 4.5%. The perfluorocarboxylic acid resin used is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5methyl-8-nonenoic acid methyl ester, and the ion exchange capacity is 0.95mmol / g.
[0056] The above-mentioned carbon nanotube-containing perfluorosulfonic acid resin powder and perfluorocarboxylic acid resin powder are melt-extruded and granulated to obtain respective resin masterbatch pellets.
[0057] (2) Membrane preparation and reinforcement
[0058] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid resin pellets con...
Embodiment 2
[0066] (1) Preparation of resin pellets
[0067] Perfluorosulfonic acid resin 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 1.08mmol / g , the (6,6) type single-walled carbon nanotubes with a length of about 40 microns are fully mixed with the above-mentioned perfluorosulfonic acid resin powder (mass ratio 10:100), and then melt-extruded and granulated to obtain perfluorinated carbon nanotube-containing Pellets of sulfonic acid resin. The perfluorocarboxylic acid resin used is the powder obtained by the copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5-methyl-8-nonenoate methyl ester, the ion exchange capacity is 0.97mmol / g, and it is melt-extruded Go out and granulate to obtain the pellet of perfluorocarboxylic acid resin.
[0068] (2) Membrane preparation and reinforcement
[0069] Using the above-mentioned perfluorocarboxylic a...
Embodiment 3
[0075] Step (1), step (2) and step (3) are the same as in Example 1, except that the particle size distribution of the nano-silver powder in step (3) is 25-45 nm.
[0076] The prepared ion membrane tensile strength of the present embodiment is 33MPa, can be used for the ion exchange membrane in the chlor-alkali ion membrane electrolyzer, at 5.5kA / 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 2.24-2.31V, and the current efficiency is 96.7%.
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