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Preparation method of modified nanometer SiO2-AA-AM copolymer

A technology of sio2-aa-am and copolymer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high production cost of the core, difficulty in controlling the degree of regularity of the core, and poor injectability of hyperbranched polymers. To achieve the effect of optimizing viscosity increasing performance

Inactive Publication Date: 2015-11-25
SOUTHWEST PETROLEUM UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the number of branched chains can be increased by increasing the algebra of the organic inner core, the higher the inner algebra, the larger the molecular size, and the poorer the injectability of hyperbranched polymers; in addition, the higher the inner algebra, the less side reactions The more, the regularity of the kernel will be difficult to control. Even if a series of separation and purification techniques can be used to obtain a more regular kernel, the production cost of the kernel will be high

Method used

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  • Preparation method of modified nanometer SiO2-AA-AM copolymer
  • Preparation method of modified nanometer SiO2-AA-AM copolymer
  • Preparation method of modified nanometer SiO2-AA-AM copolymer

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Embodiment 1

[0022] Embodiment 1 Modified nano-SiO 2 Preparation of functional monomers

[0023] The modified nano-SiO described in this embodiment 2 The functional monomer is prepared by a method comprising the following steps: (1) using nano-SiO 2 and 3-aminopropyltriethoxysilane (KH540) in anhydrous toluene solution at 80°C for 12h to obtain amino-modified nano-SiO 2 , and by controlling the amount of 3-aminopropyltriethoxysilane added to control the nano-SiO 2 The content of surface amino groups; (2) the use of excess maleic anhydride and amino-modified nano-SiO 2 Reaction to get modified nano-SiO with carbon-carbon double bond 2 functional monomer. Step (2) includes the following operations: 1. add maleic anhydride in N,N-dimethylformamide solution, stir and dissolve to obtain a mixed solution completely; 2. 2 Add N,N-dimethylformamide to the mixture and stir to obtain a dispersion; ③ Add the dispersion obtained in operation ② dropwise to the mixed solution obtained in operation...

Embodiment 2

[0024] Embodiment 2 Modified nano-SiO 2 - Preparation of AA-AM copolymer

[0025] The modified nano-SiO of this embodiment 2 -The preparation method of AA-AM copolymer, comprises the following steps: (1) will modify nano-SiO 2 Mix functional monomers, acrylamide and acrylic acid, adjust the pH value to 7.0 with sodium hydroxide, add distilled water to make an aqueous solution with a total mass concentration of monomers of 25.0%; when the temperature rises to 40°C, add an initiator and pass nitrogen protection , and react at a temperature of 40.0°C; the reaction product can be washed, pulverized and dried to obtain the copolymer. Wherein, the mass of the initiator is 0.20wt% of the total mass of the monomers, and the initiator is a mixture of ammonium persulfate and sodium bisulfite, and the molar ratio of the two is 1:1. The mass ratio of acrylamide to acrylic acid in the monomer is 3.2, and the modified nano-SiO 2 The content of functional monomer is 0.50wt%. By using na...

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Abstract

The invention relates to a preparation method of a modified nanometer SiO2-AA-AM copolymer. The preparation method comprises that a modified nanometer SiO2 functional nanometer, acrylamide and acrylic acid are mixed, pH of the mixed solution is adjusted to 6.0-7.5 by sodium hydroxide, distilled water is added into the mixed solution so that an aqueous solution with the monomer total mass concentration of 20.0-26.0% is obtained, an initiator is added into the aqueous solution, the mixed solution undergoes a reaction at a temperature of 36.0-42.0 DEG C in a nitrogen protective atmosphere to produce a reaction product, and the reaction product is washed, crushed and dried to form the copolymer. The nanometer SiO2 is introduced into the copolymer, and an amino group is connected to the surface of the nanometer SiO2 so that a double bond is connected to the surface of the nanometer SiO2 and thus the nanometer SiO2, acrylic acid and acrylamide undergo a polymerization reaction to produce the copolymer. The copolymer has a spatial network structure. Through control of a modification degree of the surface of a modified nanometer SiO2 functional monomer, copolymer viscosity-increasing performances are improved.

Description

technical field [0001] The present invention relates to the technical field of polymer material preparation, more specifically, the present invention relates to a kind of modified nano SiO 2 - Process for the preparation of AA-AM copolymers. Background technique [0002] As a non-renewable resource, petroleum plays an important role in the fields of industry and national defense. In order to increase the production life of the oil field and increase the output of the oil field, the use of polymer flooding is an important technology. Polymer flooding refers to adding a small amount of polymer to the injected water to increase the viscosity of the water phase and reduce the permeability of the oil layer to increase the sweep coefficient and enhance the recovery factor. At present, polymer flooding has entered the stage of industrialization in my country's Daqing Oilfield, Shengli Oilfield, Dagang Oilfield, Jilin Oilfield, and Henan Oilfield, and has achieved good oil-increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/56C08F220/06C09K8/588
Inventor 赖南君唐雷叶仲斌周庆王锦
Owner SOUTHWEST PETROLEUM UNIV
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