Design And Synthesis Of The Oil-drive Copolymer With New Structure In The Presentation Of Template

A new structural copolymer which is used for EOR was synthesized by the copolymerization of AM and other functional monomer in the presence of the template on the basis the design theory of molecular structure of polymer, which is temperature and salt-resistant with high molecular weight. The factors for the intrinsic viscosity of the copolymers were investigated and confirmed. The structures were characterized and the performances of the solutions were tested, with the results as follows:Dimethylallylamine (DMAA) and allylamine (AA) were used in the reactions with hydrochloric acid respectively to synthesize the cationic monomer dimethylallylamine chloride (DMAAC) and allylamine chloride (AAC), which were characterized by IR. The synthetic conditions were optimized: when the temperature of the reaction system was 10℃, reaction time was 2 hours and the molar ratio of DMAA with HCl was 1.0:1.1, the DMAAC production rate was 37.6%; when the temperature was 8℃, the reaction time was 5 hours and the molar ratio of AA and HCl was 1.0:1.1, the yield rate could reach to 91.6%.The monomers synthesized were polymerized to be poly(dimethylallylamine) (PDMAAC) and poly(allylamine) (PAAC), which were characterized by IR, 1H NMR and 13C NMR. The polymerization conditions were optimized: when the mass concentrations of DMAAC, EDTA and initiator was 60%, 100mg/L and 0.8% respectively, the intrinsic viscosity of PDMAAC was 3.337; when the polymerization time was 40 hours, the temperature was 50℃and the mass concentration of initiator and EDTA was 1.2%, 100mg/L, the intrinsic viscosity of PAAC could reach to 3.401.Acrylamide (AM) and 2-acrylamido-2-methylpropone sulfonate (AMPS) were initiated to copolymerize in the presence of the cationic template PDMAAC or PAAC. Copolymers P(AM/AMPS/PDMAAC), P(AM/AMPS/PAAC) and P(AM/AMPS) were produced.The factors for the intrinsic viscosity of the copolymers were investigated in the presence of each template, and the optimum conditions were confirmed: mass concentration of monomers: 20%, mass concentration of the initiators=75mg/L, pH of the system: 8, molar ratio of template and AMPS: 1.0/1.0, molar ratio of AM and AMPS: 4/1, temperature of the copolymerization: 5℃, mass concentration of NH₂CONH₂ , EDTA, Span-20, HCOONa was 100mg/L, 200mg/L, 200mg/L, 100mg/L respectively.The viscosity retaining ratio of P(AM/AMPS/PAAC) at 90℃was 69.37%, but when the template PAAC removed, it could reach to as high as 73.39%, the thermostable performances of both were wonderful with the viscosity retaining ratio of 12.69% and 17.65% respectively. Both of them hehaved well in salt-resistance: when the mass concentration of NaCl was 10%, the viscosity retaining ratio was 27.8% and 38.6%, when the mass concentration of GaCl2 reach to 0.5%, the viscosity retaining ratio was 24.18%,33.51% respectively.