Porous hydrophilic film
A technology of hydrophilic membrane and hydrophilic group, applied in the field of hydrophilic membrane and its preparation, can solve problems such as platinum poisoning, and achieve the effect of high electrode life
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[0096] Determination of the water transmission rate of the membrane
[0097] The membrane is fixed at the bottom of the vertical cylinder, supported by a porous metal plate with a pore size of 0.5mm, the diameter of the plate is 36mm, and the transmission rate is higher than 500,000l / (h.m 2 .atm.). Therefore, the resistance to water flow caused by the metal plate is insignificant compared to the resistance of the membrane. A requirement for the seating of the membrane in the measuring device is that it should end up being fairly flat and not strained by the applied pressure. 130 mL of deionized and distilled water was poured into the metal cylinder and flowed over the membrane. The cylinder was sealed, and the internal pressure was adjusted by blowing nitrogen gas. Read the pressure from the pressure gauge and maintain it constant at the specified value with the pressure reducing valve. Water passing through the membrane is collected in a container placed below the cylinde...
example 1
[0110] Preparation of ionomer with equivalent weight 461 g / eq
[0111] In a 2 liter autoclave, introduce the following reactants:
[0112] -850mL deionized water;
[0113] -74g general formula CF 2 = CF-O-CF 2 CF 2 -SO 2 F monomer;
[0114] -240g 5wt% acid end group has been saponified by ammonium fluorinated polyoxyalkylene aqueous solution, general formula is as follows: CF 2 ClO(CF 2 CF(CF 3 )O) n (CF 2 O) m CF 2 COONH 4 , wherein n / m=10, average molecular weight 527;
[0115] -13mL33% (volume) iodide transfer agent, the general formula is I-(CF 2 ) 6 -I, in perfluoropolyether solvent Galden Solution in D02;
[0116] -2mL1.5% (volume) formula CH 2 =CH-(CF 2 ) 6 -CH=CH 2 Diene in perfluoropolyether solvent Galden solution in D02.
[0117] The mixture was heated to 60°C while maintaining stirring at 700 rpm. Then, 50 mL of an aqueous ammonium persulfate (APS) solution with a concentration of 8 g / l was added to the autoclave. The pressure was raise...
example 2
[0120] Preparation of cross-linked membrane for fuel cell containing 23wt% Example 1 amorphous ionomer
[0121] The ionomer obtained in 1.32g example 1 was dissolved in 26g methyl perfluorobutyl ether (HFE 7100). A porous PTFE membrane with a thickness of 40 μm, an average pore diameter of 0.2 μm and a weight of 87 mg fixed on a PTFE (polytetrafluoroethylene) frame with an inner diameter of 60 mm was impregnated with this ionomer solution. 1 mL of ionomer solution was deposited on each of the two sides of the membrane, which was evenly distributed over the entire surface of the membrane. After the solvent had partially evaporated into air, the film was transferred to an oven at 140°C for 4 minutes. This impregnation and solvent evaporation step is repeated again. The film was transparent.
[0122] 0.6 mL of a crosslinker mixture was then deposited on each side of the film by passing 6.8 g of Luperox 101 (2,5-bis(tert-butylperoxy)-2,5-dimethylhexane), 14.9 g of Formula C...
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