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Hydrophobically modified hyperbranched polymer and preparation method thereof

A hyperbranched polymer and hydrophobic modification technology, applied in the field of polymers, can solve the problem of difficulty in controlling the addition of divinyl or dipropylene monomers, low reactivity ratio of N-vinyl-2-pyrrolidone, polymer Viscosity increase and salt resistance are not ideal, to achieve the effect of true and reliable principle, excellent viscosity increase and good shear resistance

Inactive Publication Date: 2018-11-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, the problems in the prior art are: existing methods for improving the performance of polymers have complex synthetic methods and low reactivity ratio of N-vinyl-2-pyrrolidone, which is difficult to combine with acrylamide and 2-acrylamide Copolymerization of 2-methylpropanesulfonic acid, etc.; there are problems of poor hydrolysis resistance and anti-aging performance; the addition of divinyl or dipropylene monomers is difficult to control, and the effect of polymer viscosity increasing is not obvious if it is too low. It is difficult to dissolve the polymer if it is too high; the viscosity-increasing and salt-resistant properties of the polymer are still not ideal

Method used

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  • Hydrophobically modified hyperbranched polymer and preparation method thereof
  • Hydrophobically modified hyperbranched polymer and preparation method thereof
  • Hydrophobically modified hyperbranched polymer and preparation method thereof

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preparation example Construction

[0028] Such as figure 1 Shown, the preparation method of the hydrophobically modified hyperbranched polymer that the embodiment of the present invention provides comprises the following steps:

[0029] S101: Add acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and hyperbranched modified monomer in deionized water, stir evenly, adjust the pH value to 7 with sodium hydroxide, and then add hydrophobic monomer N-benzyl-N-alkyl (meth)acrylamide and surfactant sodium lauryl sulfate are magnetically stirred until the solution is clear and transparent;

[0030] S102: remove the dissolved oxygen in the water with inert gas for 15 minutes;

[0031] S103: Add the photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, place the reaction system under the photoinitiator to react for 3-5 hours, and the reaction temperature is 10-30 °C, a white colloid is obtained, which is a hydrophobically modified hyperbranched polymer.

[0032] In a preferred embodiment...

Embodiment 1

[0036] Weigh 10g of acrylamide, 2.5g of acrylic acid, 0.01g of hyperbranched modified monomer, add distilled water and stir evenly, and adjust the pH value to 7; add 0.2g of N-benzyl-N-dodecylmethacrylamide and 0.7g Sodium lauryl sulfate, add a certain amount of distilled water again, make solution quality reach 50g, stir until solution is clear and transparent; Logical nitrogen gas 15min, remove the dissolved oxygen in water; Add initiator Irgacure2959 (0.016wt% of total monomer mass), Placed under the photoinitiator, reacted for 4h.

Embodiment 2

[0038] Weigh 9.9g acrylamide, 1.6g acrylic acid, 1.0g 2-acrylamide-2-methylpropanesulfonic acid, 0.01g hyperbranched modified monomer, add distilled water and stir evenly, adjust the pH value to 7; add 0.2gN- Benzyl-N-dodecylmethacrylamide and 0.7g sodium lauryl sulfate, add a certain amount of distilled water to make the solution quality reach 50g, stir until the solution is clear and transparent; blow nitrogen gas for 15min to remove dissolved oxygen in the water ; Add the initiator Irgacure2959 (0.016wt% of the total mass of the monomer), place it under the photoinitiator, and react for 4h.

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Abstract

The invention belongs to the technical field of polymer and discloses hydrophobically modified hyperbranched polymer and a preparation method thereof. The polymer is prepared by a photo-initiation free radical micelle copolymerization method. The method includes: adding surfactant lauryl sodium sulfate and N-benzyl-N-alkyl(methyl) acrylamide into an aqueous solution containing water-soluble monomers such as acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and hyperbranched modified monomers, using the surfactant to solubilize hydrophobic monomers into formed micelle, and using photo-initiation to copolymerize the hydrophobic monomers and the water-soluble monomers. The prepared hydrophobically modified hyperbranched polymer is good in solubility, high in viscosity increasing ability, good in temperature and salt resistance, good in shearing resistance, capable of being used as an oil-displacing agent capable of increasing oil recovery ratio or an acid fracturing thickening agent and promising in application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymers, in particular to a hydrophobically modified hyperbranched polymer and a preparation method thereof. Background technique [0002] After decades of development, polymers have been widely used in a series of effective technologies for oil well drilling, water control and oil stabilization, and acid fracturing adapted to different reservoir conditions. However, in practical applications in oil fields, polymers have serious degradation problems, including mechanical degradation, thermal degradation, chemical degradation, and microbial degradation. [0003] At present, the main ways to improve the performance of polymers are: [0004] (1) Copolymerize acrylamide with functional monomers with temperature-resistant and salt-resistant structures (such as sulfonic acid groups, rigid groups, quaternary ammonium salt cations, etc.) to prepare temperature-resistant and salt-resistant polymers. Chen Shilan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/32C08F220/56C08F220/06C08F220/58C08F220/54C09K8/588C09K8/62
CPCC08F8/32C08F220/56C09K8/588C09K8/62C08F220/06C08F220/585C08F220/54
Inventor 李勇明任强吴磊陈希
Owner SOUTHWEST PETROLEUM UNIV
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