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Cationic monomer for zwitterionic copolymer, preparation method thereof, zwitterionic copolymer, preparation method and application thereof

A cationic monomer, zwitterion technology, applied in the field of copolymers, can solve the problems of poor temperature resistance and low selectivity of zwitterionic copolymers, and achieve the effect of good temperature resistance

Active Publication Date: 2018-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of low selectivity and poor temperature resistance of zwitterionic copolymers in the prior art, and introduce a rigid group benzene ring into the molecular structure of the polymer, thereby providing a new high selectivity, temperature resistance Acrylamide Zwitterionic Copolymer with Better Performance

Method used

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  • Cationic monomer for zwitterionic copolymer, preparation method thereof, zwitterionic copolymer, preparation method and application thereof
  • Cationic monomer for zwitterionic copolymer, preparation method thereof, zwitterionic copolymer, preparation method and application thereof
  • Cationic monomer for zwitterionic copolymer, preparation method thereof, zwitterionic copolymer, preparation method and application thereof

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preparation example Construction

[0039] In a second aspect, the present invention provides a method for preparing the aforementioned cationic monomer for the zwitterionic copolymer, the method comprising:

[0040] (1) Under alkaline conditions, the monomer shown in formula (2) is contacted with the compound shown in formula (3) in an organic solvent;

[0041] (2) The product obtained through step (1) is mixed with the compound shown in formula (4);

[0042]

[0043] Among them, R 1 , R 2 , R 3 , R 4 , X and n are as defined above in the present invention.

[0044] According to the present invention, the relevant definition of the cationic monomer for the zwitterionic copolymer in the preparation method of the cationic monomer for the zwitterionic copolymer is as described above in the present invention. In order to avoid repetition, the present invention will not repeat them here.

[0045] In step (1), the conditions of the contact reaction may include: a temperature of 5-30° C., and a time of 20-240 ...

preparation example 1

[0087] This preparation example is used to prepare methacryloyl chloride (a kind of in the monomer shown in formula (2)):

[0088] Install a stirrer, a fractionating column, a dropping funnel, and a thermometer on the four-neck flask, and install a receiving bottle with a vacuum tailpiece behind the condenser. Add 3.0 mol of benzoyl chloride, 0.3 mol of methacrylic acid and 0.7 g of cuprous chloride into the flask. Add 2.7mol of methacrylic acid to the dropping funnel. Start the vacuum pump to control the vacuum to 0.2MPa. Heat and stir until the temperature reaches 75°C, and methacryloyl chloride distills out from the receiving bottle. At the same time, methacrylic acid was added dropwise with a dropping funnel. Heated and stirred for 60 minutes. Obtain methacryloyl chloride product for use.

preparation example 2

[0090] This preparation example is used to prepare the cationic monomer (dimethyl dodecyl bromide (2-methacrylamido-p-phenyl) ammonium bromide) for the zwitterionic copolymer:

[0091] (1) In a three-neck round bottom flask equipped with a stirrer and a nitrogen pipe, add 250 mL of dichloromethane, 0.3 mol of 4-amino-N,N-dimethylaniline and 40 mL of 9 mol / L sodium hydroxide solution. Nitrogen was blown in, and the solution was stirred and dissolved at 5°C. 0.3mol of methacryloyl chloride dissolved in 50mL of dichloromethane was added dropwise with the dropping funnel. The reaction was stirred for 90 min. The organic layer was separated, and the solvent was distilled off to obtain 50.9 g of the product. Add 0.08 g of phenothiazine to the obtained product, and distill under reduced pressure. Collect fractions at 90-100°C and vacuum degree of 50Pa, and the product obtained is methacrylamide-p-phenyldimethylamine;

[0092] (2) Stir and mix 0.1 mol of methacrylamide-p-phenyldim...

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Abstract

Relating to the copolymer field, the invention discloses a cationic monomer for a zwitterionic copolymer, a preparation method thereof, a zwitterionic copolymer, a preparation method and application thereof. The cationic monomer for the zwitterionic copolymer provided by the invention has a structure shown as formula (1), wherein R1 is H or alkyl of C1-C3; R2 is at least one of H, methyl, ethyl, methoxy, ethoxy and halogen element; R3 and R4 are H or alkyl of C1-C4 independently; X is halogen element; and n is an integer of 3-13. Because of the introduction of a cationic group, the acrylamide zwitterionic copolymer provided by the invention has strong adsorption on the stratum surface, and the washout resistance of the polymer on the stratum surface is improved. Because of the existence of zwitterions in the molecule, the temperature resistance and salt resistance of the polymer are improved, and the zwitterionic copolymer can be used for high temperature and high mineralization degree oil reservoirs. (formula (1)).

Description

technical field [0001] The present invention relates to the field of copolymers, in particular to a cationic monomer for zwitterionic copolymers and a preparation method thereof, an acrylamide-based zwitterionic copolymer, a method for preparing an acrylamide-based zwitterionic copolymer, and The application of the acrylamide zwitterionic copolymer prepared by the method and the acrylamide zwitterionic copolymer in water plugging and profile control. Background technique [0002] As oil fields are increasingly developed, water accounts for an increasing proportion of the oil extracted. Water output from oil wells will directly cause the decline of production, the loss of formation energy, the increase of water injection intensity, and the intensification of corrosion of equipment and pipe networks, which will seriously affect the development benefits. In order to reduce this unnecessary waste, oilfield water plugging is very important in the process of oilfield exploitation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/44C07C231/12C08F220/56C08F220/60C08F220/58C08F220/06C08F228/02C09K8/508
Inventor 于芳赵方园张天宇王晓春杨捷张增丽
Owner CHINA PETROLEUM & CHEM CORP
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