An intercrossed enhanced full fluorin proton adulterated exchange film and its making method
A technology of proton exchange membrane and cross-linking point, which is applied in the direction of final product manufacturing, sustainable manufacturing/processing, solid electrolyte fuel cells, etc., and can solve the problems of reducing membrane life
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[0056] The preparation method of doping and cross-linking reinforced perfluorinated proton exchange membrane comprises the following steps:
[0057] (1) Mixing perfluorosulfonyl fluoride resin and inorganic substances to make a film by melt extrusion or hot pressing;
[0058] (2) immersing the membrane prepared in step (1) in a solution of a nitrogen-containing compound at 0°C to 150°C;
[0059] (3) forming a cross-linked structure with the resin prepared in step (2) under the action of heating or acid-base displacement reaction;
[0060] (4) The membrane prepared in step (3) is subjected to alkali hydrolysis and acidification steps to prepare a perfluorosulfonic acid-doped cross-linking enhanced membrane.
Embodiment 1
[0063] In the general formula (III), the perfluorosulfonyl fluoride resin with n=11.5, m=2, p=7 is passed through an extruder, and mixed with zirconium hydrogen phosphate powder (0.5 μm in diameter) at 210°C ( Wherein the phosphate content is 10%) extrusion, extrusion thickness is 50 μ m. A 10 cm x 10 cm piece of the above extruded film was cut out. Soak in perfluorooctanoic acid dimethyl sulfoxide at 50°C for 5 hours. After removal, the membrane was placed at 200° C. for 3 hours. The heated membrane was placed in 25% sodium hydroxide at 80°C for 8 hours, and then placed in 5% sulfuric acid at 80°C for 3 hours, and then washed to neutrality. Measure its tensile strength: 22MPa. The conductivity was 123 mS / cm.
Embodiment 2
[0065] In the general formula (III), the perfluorosulfonyl fluoride resin with n=13, m=3, p=13 is passed through an extruder, and mixed with zirconium phosphate powder (0.1 μm in diameter) at 250° C. (wherein the phosphoric acid Salt content is 20%) extrusion, extrusion thickness is 30 μ m. A 10 cm x 10 cm piece of the above extruded film was cut out. Soak in ammonium trifluoroacetate dimethylformamide at 80°C for 5 hours. After removal, the membrane was placed at 150° C. for 1.5 hours. The heated membrane was placed in 15% potassium hydroxide at 80°C for 8 hours, then placed in 10% nitric acid at 60°C for 1 hour, and then washed to neutrality. Doped perfluorosulfonic acid cross-linked reinforced membrane was obtained. Measure its tensile strength: 25MPa. The conductivity was 117 mS / cm.
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