| Use | Uses good acid resistance, has been used for the recovery of diffusion dialysis waste acid. |
polysulfone and dichloroethane are put into a three-mouth bottle, dissolved into liquid a, chloromethyl methyl ether and anhydrous zinc chloride are mixed into liquid B, liquid B is poured into liquid a, but slowly added while stirring, gradually heating to 60 ℃, keeping the temperature for 5h, making the chlorine content in the resin 5%-7%, cooling, pouring into the water phase, evaporating dichloroethane to obtain chlor, filtered at 60-70 ℃ and dried. Then put the chloromethylated polysulfone solution in the mixed solvent of dichloroethane-dimethylformamide, let it stand and defoam, cast and evaporate the solvent on the glass plate to make a bottom film, and immerse the bottom film in the trimethylamine aqueous solution., At 20-25 ℃, amination for two days, washing with water to obtain a negative film.