Hollow fiber membrane material for high-humidification hydrogen fuel cell humidifier and preparation method and application thereof

A preparation method for a hollow fiber membrane material for a high-humidification hydrogen fuel cell humidifier, comprising the following steps:

• S0, mixing and fully dissolving sulfonated polyarylene ether nitrile resin, a pore-forming agent, a modified nano-filler and a first solvent to obtain a first mixture which is then subjected to standing and vacuumizing to obtain a spinning fluid;
• coagulating the spinning fluid in an internal coagulant bath to obtain as-spun fibers;
• coagulating the as-spun fibers in an external coagulant bath to obtain a crude hollow fiber product;
• and washing and drying the crude hollow fiber product to obtain the hollow fiber membrane material for the hydrogen fuel cell humidifier, wherein the internal coagulant bath is water;
• the external coagulant bath is an aqueous hydrochloric acid solution;
• the sulfonated polyarylene ether nitrile resin has the structure as follows:
• wherein —Ar1— comprises:
• —Ar2— comprises:
• and 0<x<0.5;
• a mass ratio of the sulfonated polyarylene ether nitrile resin, the pore-forming agent and the modified nano-filler is (16-30):(3-8):(0.5-5);
• the sulfonated polyarylene ether nitrile resin is prepared by the following method:
• S1, mixing and fully dissolving inorganic alkali, diphenol and an organic mixed solvent to obtain a second mixture, wherein the diphenol is selected from the group consisting of a combination of potassium 2,5-dihydroxybenzenesulfonate and biphenol, a combination of potassium 2,5-dihydroxybenzenesulfonate and 4,4′-sulfonyldiphenol, a combination of potassium 2,5-dihydroxybenzenesulfonate and bisphenol A, and a combination of 4,4′-dihydroxy-[1,1′-biphenyl]-3,3′-potassium disulfonate and biphenol;
• S2, then adding 2,6-difluorobenzonitrile into the second mixture to obtain a third mixture, and performing heating reflux on the third mixture for reaction;
• S3, separating water from the reaction, and gradually raising a temperature of a system of the reaction to 160-170° C. for continuing the reaction;
• S4, releasing toluene, raising the temperature of the system to 180-200° C., and stopping the reaction if a viscosity of the system does not change, to obtain a first product;
• S5, soaking the first product into acetone, filtering and crushing the first product, then continuing to wash the first product with the acetone, and finally, cleaning the first product with an aqueous hydrochloric acid solution and water in sequence to obtain the sulfonated polyarylene ether nitrile resin;
• the modified nano-filler is prepared by the following method:
• mixing a nano-filler with an ethanol aqueous solution to obtain a fourth mixture, and ultrasonically dispersing the fourth mixture to obtain a nano-solution;
• mixing a silane coupling agent with an ethanol aqueous solution to obtain a fifth mixture stirring and heating the fifth mixture, and adjusting a pH value of the fifth mixture to 3-5 to obtain a coupling agent solution;
• and mixing the nano-solution with the coupling agent solution for reaction to obtain a second product, and then performing post-treatment on the second product to obtain the modified nano-filler.