Perfluorinated ion exchange membrane with evenly-distributed cross-linking points and preparing method and application thereof
A technology with uniform distribution and perfluorinated ions, used in fuel cells, electrochemical generators, electrical components, etc., can solve the problems of uneven distribution of cross-linking points, decreased mechanical strength, and decreased exchange capacity, and achieves the distribution of cross-linking points. Effects of uniformity, improved mechanical properties, high exchange capacity and electrical conductivity
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Embodiment 1
[0046] The preparation process of perfluorosulfonamide resin is as follows:
[0047] The reactor was washed, wiped dry, and purged with nitrogen, then 200g of perfluorosulfonyl fluoride resin flake pellets with sulfonyl fluoride side chains were placed in a 2L stainless steel autoclave, 700mL DMF was added, and vacuum was applied to 0.1mbar, the temperature of the kettle body low-temperature circulating cooling pump is cooled to -20±2℃, and 40g NH is added to the reaction kettle through the gas feed valve 3 , Slowly warm up to 0±2℃, stir the reaction for 70h, stop stirring; through the gas feed valve, inject 0.4kPa compressed air into the reactor, then close the gas feed valve, open the liquid discharge valve, and use pressure to remove the solvent And the remaining ammonia gas is injected into the solvent recovery bottle, and water is used to absorb the remaining ammonia gas from the reaction; the resin particles in the reactor are cleaned and dried in an oven at 120°C to obtain ...
Embodiment 2
[0050] The preparation process of perfluorosulfonamide resin is as follows:
[0051] The reactor was washed, wiped dry, and purged with nitrogen. Then 200g of perfluorosulfonyl fluoride resin flake pellets with sulfonyl fluoride side chains were placed in a 2L stainless steel autoclave, 500mL of anhydrous acetonitrile was added, and pumped Vacuum to 0.1mbar, cool down to -20±2℃ by the low-temperature circulation cooling pump of the kettle body, add 40g NH3 into the reactor through the gas feed valve, slowly raise the temperature to 25±2℃, stir and react for 24h, stop stirring; The feed valve, press 0.4kPa compressed air into the reactor, then close the gas feed valve, open the liquid discharge valve, use pressure to pump the solvent and remaining ammonia into the solvent recovery bottle, and use water to absorb the remaining ammonia from the reaction ; Clean the resin particles in the reactor and dry them in an oven at 120°C to obtain the perfluorosulfonamide resin. The target pr...
Embodiment 3
[0053] The preparation process of perfluorosulfonamide resin is as follows:
[0054] The reactor was washed, wiped dry, and purged with nitrogen, then 200g of perfluorosulfonyl fluoride resin flake pellets with sulfonyl fluoride side chains were placed in a 2L stainless steel autoclave, and 500mL anhydrous 1,4 -Dioxane, vacuum to 0.1mbar, cool down to -20±2℃ by the low-temperature circulating cooling pump of the kettle body, add 20g NH to the reaction kettle through the gas feed valve 3 , Slowly warm up to 25±2℃, stir the reaction for 24h, stop stirring; through the gas feed valve, inject 0.4kPa compressed air into the reactor, then close the gas feed valve, open the liquid discharge valve, and use pressure to remove the solvent And the remaining ammonia gas is injected into the solvent recovery bottle, and water is used to absorb the remaining ammonia gas; the resin particles in the reactor are cleaned and dried in an oven at 120°C to obtain the perfluorosulfonamide resin. The ta...
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