Preparing method for acid cation exchange fibers
A technology of acidic cation and fiber exchange, applied in cation exchange materials, separation methods, chemical instruments and methods, etc., can solve the problems of wide application limitations, poor mechanical stability, low adsorption capacity, etc., and achieve large adsorption capacity and high adsorption speed Fast, large specific surface effect
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Embodiment 1
[0018] 1. Add 20g of polypropylene fiber to 150ml of ethylene glycol, and add 40g of diethylenetriamine, and react under reflux under stirring. The product is washed with water and dried to obtain pretreated polypropylene fiber, which is ready for use.
[0019] 2. Soak 1g of pretreated polypropylene fibers in 40mL of aqueous solution containing 0.1g of ferrous ammonium sulfate and 10g of acrylamide, pass nitrogen gas for 15min, and perform grafting reaction in 80°C water bath for 6h; remove acrylamide monomer after the reaction , the product was washed three times with water, washed twice with 1% hydrochloric acid aqueous solution, and finally washed with water until neutral, and kept in a vacuum oven at 70°C for 24 hours to obtain a weakly basic ion exchange fiber.
Embodiment 2
[0021] 1. Add 25g of polypropylene fiber to 165ml of ethylene glycol, and add 35g of diethylenetriamine, and react under reflux under stirring. The product is washed with water and dried to obtain pretreated polypropylene fiber, which is ready for use.
[0022] 2. Soak 1.5g of pretreated polypropylene fiber in 32mL aqueous solution containing 0.08g of ferrous ammonium sulfate and 8g of acrylamide, blow nitrogen gas for 15min, and perform grafting reaction in 80°C water bath for 6h; after the reaction, remove acrylamide The product was washed three times with water, washed three times with 3% sulfuric acid solution, and finally washed with water until neutral, and kept in a vacuum oven at 70°C for 24 hours to obtain a weakly basic ion exchange fiber.
Embodiment 3
[0024] 1. Add 22g of polypropylene fiber to 130ml of ethylene glycol, and add 45g of diethylenetriamine, and react under reflux under stirring. The product is washed with water and dried to obtain pretreated polypropylene fiber, which is ready for use.
[0025] 2. Soak 1.2g of pretreated polypropylene fiber in 36mL aqueous solution containing 0.09g of ferrous ammonium sulfate and 9g of acrylamide, blow nitrogen gas for 15min, and perform grafting reaction in 80°C water bath for 6h; after the reaction, remove acrylamide The product was washed three times with water, twice with 5% nitric acid aqueous solution, and finally washed with water until neutral, and kept in a vacuum oven at 70°C for 24 hours to obtain a weakly basic ion exchange fiber.
[0026] Step 1 in the above examples can also be replaced by the following steps: wash the polypropylene fiber with acetone, dry it in vacuum at 80°C for 3 hours, place the dried polypropylene fiber in a sulfuric acid paper bag and accept...
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