Polyacrylamide-grafted chitosan comb-type copolymer sewage treating agent and RAFT (Reversible Addition-Fragmentation Chain Transfer) preparation method thereof
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Embodiment 1
[0024] Polyacrylamide graft chitosan comb type copolymer sewage treatment agent of the present invention, RAFT preparation method is as follows:
[0025] (a) Preparation of multi-RAFT substituted chitosan: Dissolve 5.6 parts of dithioacetate chloride ethyl ester containing acid chloride groups in 14 parts of butyl acetate, and record it as solution a; 12 parts of chitosan, 2.1 Add 42 parts of triethanolamine to the reactor, add 42 parts of butyl acetate to dissolve evenly, then add solution a dropwise thereto, continue the reaction for 10 hours after the 1.5h dropwise addition, finish the reaction and cool to room temperature, and use 40 parts of methanol for the reaction solution After dissolving and diluting, add 36 parts of acetone for precipitation, and obtain a white solid by suction filtration, then repeat the process of methanol dissolution and dilution, precipitation with acetone, and suction filtration to obtain a white solid three times, that is, there are more shells...
Embodiment 2
[0028] Polyacrylamide graft chitosan comb type copolymer sewage treatment agent of the present invention, RAFT preparation method is as follows:
[0029] (a) Preparation of multi-RAFT-substituted chitosan: Dissolve 8 parts of 2-(ethyltrithiocarbonate)-2-methylpropionyl chloride containing acid chloride groups in 20 parts of THF, and record it as solution a ; Add 10 parts of chitosan and 3 parts of N-methylpyrrole into the reactor, add 30 parts of THF to dissolve evenly, then add solution a dropwise to it, continue to react for 6 hours after 2 hours of dropping, and cool down after the reaction After reaching room temperature, dissolve and dilute the reaction solution with 60 parts of methanol, add 30 parts of acetone for precipitation, and obtain a white solid by suction filtration, then repeat the process of methanol dissolution and dilution, precipitation with acetone, and suction filtration to obtain a white solid three times, that is, more dithio Ester or trithioester subs...
Embodiment 3
[0032] Polyacrylamide graft chitosan comb type copolymer sewage treatment agent of the present invention, RAFT preparation method is as follows:
[0033](a) Preparation of multi-RAFT substituted chitosan: Dissolve 6 parts of 2-(propyltrithiocarbonate)-2-methylpropionyl chloride containing acid chloride groups in 14 parts of DMSO, and record it as solution a ; Add 13 parts of chitosan and 1.2 parts of tri-n-butylphosphine into the reactor, add 45 parts of DMSO to dissolve evenly, then add solution a dropwise to it, continue to react for 8 hours after 1.5 hours of dropping, and the reaction ends Cool to room temperature, dissolve and dilute the reaction solution with 45 parts of methanol, add 35 parts of acetone for precipitation, and obtain a white solid by suction filtration, then repeat the process of methanol dissolution and dilution, precipitation with acetone, and suction filtration to obtain a white solid three times, that is, more disulfide Ester or trithioester substitu...
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