A kind of preparation method of aromatic polyamide composite forward osmosis film
A technology of aromatic polyamide and forward osmosis, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of unimproved concentration polarization, easily damaged membrane structure and mechanical strength, etc. Achieve the effect of improving the internal concentration polarization problem, improving the anti-pollution ability and hydrophilicity, and improving the anti-pollution performance
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Embodiment 1
[0029] Take 19 grams of MPEG with an average molecular weight of 1900 g / mol, 4 grams of propyne bromide and 12 grams of sodium hydroxide powder and mix them in toluene solvent, heat up to 50 ° C, and react for 24 hours. After the reaction is complete, spin evaporate to remove the solvent. The residue was dissolved in dichloromethane and extracted three times with brine, and the organic phase was collected. Dry with anhydrous magnesium sulfate, filter, and obtain alkynyl-terminated polyethylene glycol Pro-MPEG (1900 g / mol) by precipitation three times with ice anhydrous ether, and the 2111.4 place of product infrared spectrogram has obvious alkynyl absorption peak; product of 1 H-NMR: (CDCl 3 ,500MHz)δ:(ppm)=4.17(s,2H,-CH 2 C≡C),3.35(s,3H,CH 3 O),3.53(s,4H,O-CH 2 -CH 2 -O),2.42(s,1H,C-C≡CH);
[0030]Take 50 grams of polysulfone and dissolve it in 250 grams of dichloroethane solvent, put it into a round-bottomed flask connected to a reflux condensing device and a stirring ...
Embodiment 2
[0036] Take 10 grams of MPEG with an average molecular weight of 1000 grams / mole, 12 grams of propyne bromide and 4 grams of sodium hydroxide powder, mix them in toluene solvent, heat up to 25-75 ° C, react for 24 hours, and remove them by rotary evaporation after the reaction is complete. Solvent, the residue was dissolved in dichloromethane and extracted three times with saline, and the organic phase was taken. Dry with anhydrous magnesium sulfate, filter, and settle three times with ice anhydrous ether to obtain Pro-MPEG (1000 g / mol), and the product characterization is as described in Example 1;
[0037] Get 50 grams of sulfone and dissolve in 250 grams of ethylene dichloride solvent, put into the round-bottomed flask of connecting branch reflux condensation device and stirring device, then add 5 grams of anhydrous zinc chloride and 100 grams of chloromethyl methyl ether, Heat up to 25-50°C, react for 3-12 hours, then cool to room temperature, settle the polymer with anhyd...
Embodiment 3
[0043] Take 10.91 g of PSf-MPEG (500 g / mol) and dissolve it in 80 g of mixed solvent of DMF and NMP according to the molar ratio of 1:3, raise the temperature to 70°C, configure a 12wt% solution, and react for 24 hours. After the reaction is complete, The solvent was removed by rotary evaporation, the residue was dissolved in dichloromethane and extracted three times with saline, and the organic phase was taken. Dry with anhydrous magnesium sulfate, filter, and purify through a chromatographic column after vacuum filtration to obtain Pro-MPEG (200 g / mol), and the product characterization is as described in Example 1;
[0044] Get 50 grams of sulfone and dissolve in 250 grams of ethylene dichloride solvent, put into the round-bottomed flask of connecting branch reflux condensation device and stirring device, then add 5 grams of anhydrous zinc chloride and 100 grams of chloromethyl methyl ether, Heat up to 25-50°C, react for 3-12 hours, then cool to room temperature, settle the ...
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