A kind of modified chitosan/nitrogen oxide branched monomer functionalized polymer and its preparation method and application
A technology of branched monomers and chitosan, which is applied in chemical instruments and methods, drilling compositions, flocculation/sedimentation water/sewage treatment, etc., can solve high viscosity loss, low viscosity loss, biodegradability and cost Higher problems, to achieve the effect of low viscosity loss and good flocculation effect
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[0036] A preparation method of modified chitosan / nitroxide branched monomer functionalized polymer, comprising the following steps:
[0037] S1. Nitrogen oxide branched functional monomer: in a nitrogen atmosphere, slowly add the nitroxide branched monomer solution dropwise to the continuously stirring maleic anhydride solution with a constant pressure funnel, and after the dropwise addition is completed, heat up to 70 ~80 ℃ reflux reaction for 6~9h, and then repeated precipitation and suction filtration with chloroform to obtain nitroxide branched functional monomer;
[0038] S2. Preparation of modified chitosan: under nitrogen atmosphere, add protonated chitosan into methanol and stir for 1-2 h, then slowly add methanol dissolved in methyl acrylate into it with a constant pressure funnel; The system was placed in a water bath at 25°C for 3 days, followed by dialysis and freeze-drying for 7 days to obtain modified chitosan; the molar ratio of the protonated chitosan to methyl...
Embodiment 1～ Embodiment 8
[0046] A preparation method of modified chitosan / nitroxide branched monomer functionalized polymer, comprising the following steps:
[0047] S1. Nitrogen oxide branched functional monomer: under nitrogen atmosphere, the DMF solution of nitroxide branched monomer is slowly added dropwise to the DMF solution dissolved with maleic anhydride which is continuously stirred with a constant pressure funnel, and the solution is to be added dropwise. After completion, the temperature was raised to 70° C. for reflux reaction for 6 hours, and then repeated precipitation and suction filtration with chloroform to obtain the nitroxide branched functional monomer; the molar ratio of the nitroxide branched monomer to maleic anhydride was: 1:10.
[0048] S2. Preparation of modified chitosan: under nitrogen atmosphere, add protonated chitosan into methanol and stir for 1 h, then slowly add methanol dissolved in methyl acrylate into it with a constant pressure funnel; under stirring, set the syst...
Embodiment 9
[0053] A preparation method of modified chitosan / nitroxide branched monomer functionalized polymer, comprising the following steps:
[0054] S1. Nitrogen oxide branched functional monomer: under nitrogen atmosphere, the DMF solution of nitroxide branched monomer is slowly added dropwise to the DMF solution dissolved with maleic anhydride which is continuously stirred with a constant pressure funnel, and the solution is to be added dropwise. After completion, the temperature is raised to 75°C for reflux reaction for 7.5h, and then repeated precipitation and suction filtration with chloroform to obtain nitroxide branched functional monomer; the molar ratio of the nitroxide branched monomer to maleic anhydride is 1:10;
[0055] S2. Preparation of modified chitosan: under nitrogen atmosphere, add protonated chitosan into methanol and stir for 1.5 h, then slowly add methanol in which methyl acrylate is dissolved with a constant pressure funnel; After being placed in a 25°C water b...
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