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

A water-soluble polymer, hydrophobic association technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of polymer solution viscosity, elasticity and strength reduction, increase the difficulty of polymerization reaction, and unsatisfactory association To achieve good solubility and temperature and salt resistance, improve salt resistance and shear resistance, good injection ability and fluidity control ability

Inactive Publication Date: 2013-06-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 3.1 g of skeleton monomer and 2 g of maleic anhydride into different beakers, and then add 20 g and 10 g of dimethyl sulfoxide to dissolve uniformly, and slowly add the dimethyl sulfoxide solution of skeleton monomer Add dropwise to the dimethyl sulfoxide solution of maleic anhydride, vent nitrogen during the dropwise addition, place the system in an ice salt bath, and monitor the reaction progress with the pH value. When the pH of the reaction solution is 4~5 At this time, stop dropping the skeleton monomer solution, continue stirring until the temperature of the reaction liquid system no longer rises, and repeatedly precipitate with chloroform to obtain the functional skeleton monomer.

[0043] Weigh 20 grams of acrylamide (AM), 5 grams of acrylic acid (AA), functionalized skeleton monomer 0.0025 grams, 0.005 grams, 0.0125 grams, 0.025 grams, 0.05 grams, dimethylallyl octadecyl ammonium chloride 0.2 grams and 74 grams of distilled water were added to the beaker, st...

Embodiment 2

[0045] The functionalized backbone monomer was prepared as in Example 1.

[0046] Weigh 20 grams of acrylamide (AM), 5 grams of acrylic acid (AA), 0.025 grams of functionalized skeleton monomer, 0.2 grams, 0.8 grams, 1.2 grams, and 1.6 grams of dimethylallyl octadecyl ammonium chloride. Add 74 grams of distilled water to the beaker, stir and dissolve evenly, adjust the pH to 5-6 with sodium hydroxide, preheat it in a water bath at 35℃ for 30 minutes, add 0.25 grams each of the cosolvent urea and sodium sulfate , Chain transfer agent 0.05 g sodium methoxide, oxidation-reduction initiator sodium bisulfite and ammonium persulfate 4.6 mg each, react for 8 hours to obtain four jelly polymers.

[0047] 2. Infrared spectrum analysis of functionalized skeleton monomer

[0048] The infrared spectrum of the functionalized skeleton monomer can be seen figure 1 .

[0049] figure 1 It shows that the —OH stretching vibration absorption peak of the modified skeleton monomer is 3433, the C—H stretch...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/56C08F220/06C08F226/02C08F4/40C08G69/48C09K8/588
Inventor 施雷庭徐杰朱珊珊孙晨李诚杨成玉刘钰杨杰叶仲斌陈洪
Owner SOUTHWEST PETROLEUM UNIV
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