Random copolymer and its preparation method and application, oil displacement agent composition and its preparation method
A technology of random copolymers and polymers, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as unsatisfactory oil displacement effects, limited interfacial tension capabilities, and difficult polymer dissolution, etc., to achieve Excellent temperature and salt resistance, high apparent viscosity, and enhanced oil recovery
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preparation example Construction
[0027] The present invention also provides a method for preparing a random copolymer, wherein the method comprises polymerizing the monomer mixture in water under solution polymerization conditions in the presence of an initiator, and the conditions of the polymerization are such that The viscosity-average molecular weight of the polymer is 12 million-30 million, preferably 15 million-26 million; the monomer mixture contains monomer C and monomer D, and the monomer C is selected from formula (6) to formula ( 9) One or more of the structures shown, the monomer D is a structure shown in formula (10), and based on the total moles of the monomer mixture, the content of the monomer C is 10-99.8 mol%, preferably 70-99.8 mol%, more preferably 99-99.8 mol%; the content of the monomer D is 0.2-90 mol%, preferably 0.2-30 mol%, more preferably 0.2- 1 mole%;
[0028]
[0029] Among them, R 6 for hydrogen or C 1 -C 4 the alkyl group; R 7 and R 8 same or different and each is C 1 ...
preparation example 1
[0067] This preparation is used to illustrate the preparation of the polymerizable monomers used in the present invention.
[0068] (1) Preparation of intermediates
[0069] Measure 150 ml of xylene, add it to a three-necked flask with 0.1 mol of p-phenylenediamine and 0.1 mol of oleic acid, heat to 130°C, and react for 2 hours to obtain a product containing the intermediate shown in formula (13) .
[0070]
[0071] (2) Preparation of polymerizable monomers
[0072] Add 0.1mol of maleic anhydride to the product obtained in step (1), react at 80°C for 6 hours and then filter, then use acetone solvent to recrystallize the filtered product to obtain 0.09mol of polymerizable monomer D1.
preparation example 2
[0074] This preparation is used to illustrate the preparation of the polymerizable monomers used in the present invention.
[0075] (1) Preparation of intermediates
[0076] Measure 150 milliliters of xylene, add it to a three-necked flask with 0.1 mol of p-xylylenediamine and 0.1 mol of oleic acid, heat to 150°C, and react for 6 hours to obtain the compound containing the intermediate shown in formula (14). product.
[0077]
[0078] (2) Preparation of polymerizable monomers
[0079] Add 0.1 mol of maleic anhydride to the product obtained in step (1), and react under reflux for 8 hours at 110°C, then distill off the solvent and dry to obtain a free radical polymerized functional monomer product, which is recorded as polymerizable Monomer D2. D2 was characterized by infrared spectroscopy, and the result IR spectrum was consistent with figure 1 similar.
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