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Method for preparing high-strength high-temperature-resistance polymer nanospheres

A nano-microsphere and polymer technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem that the storage modulus is greatly affected by the degree of cross-linking, the blocking strength needs to be improved, and the organic network is brittle. problem, to achieve the effect of stable microemulsion polymerization process, uniform distribution of crosslinking points, and fast reaction rate

Inactive Publication Date: 2014-08-20
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Microemulsion polymerization is a simple and easy method to prepare 10-100nm polyacrylamide microspheres. At present, the acrylamide nanospheres prepared by inverse microemulsions at home and abroad mainly have a single organic network structure. Linked, the formed organic network is brittle and insufficient in heat resistance, the storage modulus is greatly affected by the degree of cross-linking, and the plugging strength needs to be improved
There is no research and report on polymer nanospheres with inorganic and organic double network structure, high strength and high temperature resistance at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Slowly add 4.875 g of itaconic acid into 12 mL of 10% sodium hydroxide solution in an ice bath, fully stir, and react for 2 hours to obtain a partially neutralized itaconic acid aqueous solution. Mix 4.875 g of acrylamide and 0.0294 g ethylene glycol diacrylate and 9.8mL mass concentration of 1% hectorite water dispersion were added to the partially neutralized itaconic acid aqueous solution, stirred evenly for 40min to obtain a monomer and hectorite mixed solution, and then It was added to a three-necked flask equipped with 100g cyclohexane, 4.8g Span80 and 3.2g Tween80, stirred evenly for 40min to form a transparent inverse microemulsion, and then gradually heated to 60°C, adding 0.078g potassium persulfate and 0.0445g formaldehyde Sodium hyposulfite triggers the reverse-phase microemulsion polymerization reaction, and reacts for 3 hours to obtain a transparent or translucent polymer nanosphere reverse-phase microemulsion with an average particle size of 70nm, which is...

Embodiment 2

[0048] 1.3929g of itaconic acid was slowly added to 6mL of 10% sodium hydroxide solution in an ice bath, fully stirred, and reacted for 0.5h to obtain a partially neutralized itaconic acid aqueous solution. 0.5969g of acrylamide and Add 0.0119g of N,N'-methylenebisacrylamide and 9.9mL of 1% laponite aqueous dispersion to the partially neutralized itaconic acid aqueous solution, and stir uniformly for 20min to obtain monomer and lithium soap Then add it into a three-necked flask equipped with 100g of liquid paraffin, 10.6667g of Span80 and 5.3333g of Tween80, and stir evenly for 20min to form a transparent inverse microemulsion, then gradually heat up to 45°C, add 0.0159g of Tween80 Ammonium sulfate and 0.0073g sodium bisulfite initiate the inverse microemulsion polymerization reaction, react for 5 hours, obtain transparent or translucent, the average particle diameter is the polymer nanosphere inverse microemulsion of 50nm, with ethanol demulsification precipitation, acetone W...

Embodiment 3

[0050]Slowly add 2.1667g of itaconic acid into 8mL of 10% sodium hydroxide solution in an ice bath, fully stir, and react for 1h to obtain a partially neutralized itaconic acid aqueous solution. Mix 5.0556g of acrylamide and 0.0217 g Polyethylene glycol diacrylate and 10.8mL mass concentration of 1% hectorite water dispersion were added to the partially neutralized itaconic acid aqueous solution, stirred evenly for 30min to obtain a mixed solution of monomer and hectorite, and then Add it into a three-necked flask with 100g of white oil, 9.6g of Span80 and 6.4g of Tween80, stir evenly for 30min to form a transparent inverse microemulsion, then gradually raise the temperature to 50°C, add 0.0289g of ammonium persulfate and 0.0145g of sodium sulfite Initiate reverse phase microemulsion polymerization reaction, react 5 hours, obtain transparent or translucent, the polymer nanometer microsphere reverse phase microemulsion that average particle size is 48nm, with ethanol demulsifica...

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Abstract

The invention relates to a preparing method of high-intensity high-temperature-resistance polymer nanometer microspheres. The preparing method comprises the following characteristic process steps that itaconic acid is neutralized by a sodium hydroxide solution; acrylamide, cross-linking agents and a hectorite aqueous dispersion are added; the mixture is uniformly stirred, and a monomer and hectorite mixed solution is obtained; then, the monomer and hectorite mixed solution is added into a three-necked flask containing oil-soluble solvents and Span80 / Tween80 composite surfactants; uniform stirring is carried out, and a transparent reversed-phase microemulsion is formed; the reversed-phase microemulsion is heated, then, a certain amount of oxidizing agents and reducing agents are added for initiating reversed-phase microemulsion polymerization; and demulsification, precipitation, washing, drying and fine grinding are carried out, and white polymer nanometer microsphere powder is obtained. The polymer nanometer microspheres prepared by the preparing method provided by the invention have the proper water absorption and salt absorption properties, better water absorption swelling property, higher jelly strength and higher temperature resistance, and meet the ultra-low permeability reservoir profile control and water shutoff requirements that the water absorption speed of polymer deep profile control agents is not suitable to be too high or too low, the water absorption rate is not suitable to be too high or too low, the permeability is smaller than 1*10<-3>[mu]m<2>, and the pore throat radius is smaller than 8[mu]m.

Description

technical field [0001] The invention relates to a method for preparing high-strength and high-temperature-resistant polymer nanospheres. The high-strength and high-temperature-resistant polymer nanospheres prepared by the invention can be widely used in oil field profile control and oil displacement, heavy metal ions and dye adsorption and Separation and water treatment, etc. Background technique [0002] In the course of reservoir development, water injection development is the most economical and effective means to replenish formation energy and enhance oil recovery. Since most of my country's oil reservoirs belong to continental deposits, the oil saturation is relatively low, the reservoirs are scattered, and the permeability gradient is large. Therefore, water injection development often forms large-scale seepage channels in the water phase, and the injected water cannot effectively push the crude oil in the reservoir. , quickly flow out from the oil well, forming an inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/02C08F220/56C08F2/32C08F4/40C08K3/34C09K8/512C09K8/588
Inventor 万涛胡俊燕谭雪梅徐敏程文忠李蕊香邹矗张
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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