Hyperbranched hydrophobical-associating water-soluble polymer and its preparation method

Abstract

The invention discloses a hyperbranched hydrophobical-associating water-soluble polymer and its preparation method. The polymer is obtained through copolymerizing acrylamide, acrylic acid, a hydrophobic monomer and functional hyperbranched macromolecules. The preparation method of the polymer comprises the following steps: 1, respectively dissolving a hyperbranched polyamide-amine macro-molecular skeleton treating diethylenetriamine as a core and maleic anhydride (or acryloyl chloride or acrylic anhydride) in dimethyl sulphoxide, slowly adding the skeleton monomer solution to the maleic anhydride solution in a dropwise manner, letting in nitrogen, placing the obtained system in an icy salt bath, stopping the dropwise addition of the skeleton monomer solution when the pH value of a reaction solution reaches 4-5, and precipitating with chloroform to obtain a functionalized skeleton monomer; and 2, carrying out free radical aqueous solution polymerization of sodium acrylate, acrylamide, the hydrophobic monomer dimethylallyl-N-alkylammonium chloride and the functional skeleton monomer. The preparation method has a reliable principle and is simple to operate, and the synthesized polymer still has a good thickening capability and a good seepage performance under a high mineralization degree and a strong shearing action.

Description

Technical field [0001] The invention relates to a hyperbranched hydrophobically associating water-soluble polymer and a preparation method thereof, and belongs to the field of polymer materials. Background technique [0002] Hydrophobically associating water-soluble polymer refers to a polymer that has water solubility by introducing a small amount of hydrophobic groups into the main chain of water-soluble polyacrylamide. In an aqueous solution, the hydrophobically associating water-soluble polymer forms a three-dimensional network structure in the solution through hydrophobic association, thereby significantly increasing the viscosity of the aqueous solution (Feng Yujun, Luo Chuanqiu, Luo Pingya, etc.. Hydrophobic associating water-soluble polyacrylamide Research on the structure of solution[J]. Acta Petrolei Sinica (Petroleum Processing).2001,17(06):39-43). Compared with general polymers (such as partially hydrolyzed polyacrylamides), hydrophobically associating water-soluble ...

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Problems solved by technology

[0003] In order to improve the solubility of hydrophobically associated water-soluble polymers and maintain the performance of polymer solutions, the amount of hydrophobic monomers introduced is less, but the association in aqueous solutions is not ideal (Podhajecka K, Prochazka K, Hourdet D.Synthesis and viscoelastic behavior of water-soluble polymers modified with strong hydrophobic side chains[J].Polymer,2007,48(6):1586-1595)

Therefore, in order to further improve the viscosity-increasing ability and oil displacement effect of hydrophobically associated water-soluble polymers, on the one hand, increase the molecular weight, but too high molecular weight not only increases the difficulty of polymerization reaction, but also makes it difficult to dissolve and use. On the other hand, it is to increase the degree of hydrolysis, and the electrostatic repulsion between the carboxyl charged groups obtained by hydrolysis increases the hydrodynamic radius of the polymer, thereby obtaining a stronger viscosity-increasing effect, but in the environment of high salinity , due to the shielding of high ionic strength, the electrostatic repulsion between the chain segments is greatly weakened, and this advantage is not significant. poor effect

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