Study On Synthesis Technology And Properties Of Hydrogen Bonding Mediated Interpolymer Complexes Drag Reducer Based On Long Chain Methacrylate

High molecular weight linear chain polymer can be widely used as DRAs (drag reducing agents) in long distance pipelines to overcome frictional losses in turbulent flow. Presently, soluble polymers, such as polyisobutylene, polystyrene, and several a-olefins, have been demonstrated to reduce drag friction in turbulent flows of hydrocarbon liquids.In respect that the ultrahigh molecular wight linear polymers have the defect of shear degradation, the DRAs can be only injected to the pipelines after pumping. In order to resolve the conflict of ultrahigh molecular wight and low shear stability, the interpolymers have secondary interactions (e.g. electrostatic, hydrogen bonding or hydrophobic interaction) have been synthesized. It is generally believed that these secondary bonds can be reversible breakage in prefer to the cleavage of polymer backbone, and formed again in regions of lower shear.In this paper, A new type of hydrogen bonding mediated interpolymer complexes based on long chain methacrylate was prepared by emulsion polymerization using K2SO8-Na2SO3 as redox initiator system. The effects of the synthesis temperature, the ratio between reductant and oxidant on drag reducing efficiency and the monomer composition on the shear stability of the complexes were studied. The results show that when temperature is 25℃, the ratio between reductant and oxidant is 1.2:1, the polar monor composition was 1.5%, and the dropping time is 2-3 hour, the drag efficiency and shear stability of the hydrogen bonding mediated interpolymer complexes have the optimal value. The pH value of the emulsion polymerization system was also studied.The influences of temperature, shearing rate, concentration and monomer composition on rheological properties of the interpolymer complexes diesel solution were also investigated. When the performance of shear stability was best, the optimum synthesis technological conditions were given. The rheological study shows that, proton donor and proton acceptor polymers diesel solution fit into pseudo-plastic fluid respectively, which accord with power-law equation, but when y<200 s-1, Rheological curve of the interpolymer complexes deviate from the power-law equation. The results also show that the variation of viscosity with temperature and concentration of the interpolymer complexes is apparently different from that of its association predecessor. Finally, a potential measurement of shear stability had been obtained.Fourier transform infrared spectrometry and simultaneous thermal analyzer were employed to analyze several brands of drag-reduction agents. Consequently, the fundamental structures of the polymer contained were determined; the interaction between proton donor polymer and proton acceptor polymer was also demonstrated.