| abstract |
The present invention provides a hydrophobically associated polymer, which comprises repeating units represented by formulas (I) and (II); nwherein, x:y=1:(0.001¼0.06), said A is the monomer unit of hydrophobic monomer, and the viscosity-average molecular weight of the hydrophobically associated polymer is 5,000,000¼35,000,000. Compared with the prior art, the hydrophobically associated polymer of the present invention comprises two kinds of monomer units: a hydrophilic unit, which is acrylamide monomer unit and can provide hydrophilic group for the hydrophobic polymer to ensure that the polymer has a good water-solubility; a hydrophobic unit, which is a hydrophobic monomer unit and can provide hydrophobic pendant for the hydrophobically associated polymer to ensure that the polymer chain has certain hydrophobic property. In water, the hydrophobic groups aggregate due to hydrophobic interaction, to form a spatial network structure, thus providing necessary viscoelasticity for the solution. The above two kinds of units work together to improve the temperature resistance, salt tolerance and shear resistance of the hydrophobically associated polymer. |