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Viscosity highly increased water-soluble hydrophobic association copolymer and preparation method and use thereof

A water-soluble copolymer, hydrophobic association technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high critical association concentration of solution, poor stability of polymer solution, decrease of viscosity of copolymer solution, etc.

Inactive Publication Date: 2004-11-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, the thermal stability of HPAM is poor. When the formation depth is as high as 2000 feet, the temperature of the oil layer is above 75°C, and the partially hydrolyzed polyacrylamide is easy to age in the formation environment, which greatly reduces the viscosity of the polymer solution.
In the latter two literature reports, there are problems in the copolymer obtained by copolymerization of styrene as a hydrophobic monomer and acrylamide: (1) because it is a nonionic copolymer, even if a small amount of styrene is added, the copolymer is difficult to dissolve; (2) ) Because the hydrophobic group chain of the hydrophobic monomer styrene is short and has only benzene ring, the hydrophobic association effect of the copolymer solution is poor, and the critical association concentration of the solution is high; (3) the solution viscosity is low, even if it is above the critical association concentration, the solution The apparent viscosity is also lower
(4) The stability of the polymer solution is poor, and microgels will appear after a long period of storage, and even phase separation will occur, resulting in a sharp drop in the viscosity of the copolymer solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 20.000 grams of acrylamide, 16.073 grams of acrylic acid, 3.780 grams of p-tert-butylstyrene and 108.912 grams of sodium lauryl sulfate in 1099 ml of distilled water, add them to a three-necked reaction flask, adjust the pH of the solution to 8 with NaOH, and the reaction temperature is 50 ℃, through N 2 After 30 minutes, add 1.21 ml of 0.05 mol / l potassium persulfate initiator solution, react for 16 hours, dilute the polymer with water to obtain a PAAST concentrated solution.

Embodiment 2

[0045] Dissolve 20.000 g of acrylamide, 0.630 g of 2-acrylamido-2-methylpropanesulfonic acid, 0.455 g of n-butylstyrene and 3.875 g of sodium lauryl sulfate in 155 ml of deionized water, and adjust the pH with NaOH =3, the reaction temperature is 50°C, and N is passed through 2 After 30 minutes, add 0.65 ml of 0.05 mol / l ammonium persulfate initiator solution, and react for 6 hours. The polymer was dissolved in water to prepare a concentrated solution of PAAST.

Embodiment 3

[0047] Dissolve 20.000 grams of acrylamide, 4.620 grams of dimethyl diallyl ammonium chloride, 0.561 grams of n-hexylstyrene and 10.750 grams of trimethylhexadecyl ammonium bromide in 250 ml of deionized water, and adjust the pH with hydrochloric acid =7, the reaction temperature is 50°C, and N is passed through 2 After 30 min, 5.51 ml of 0.05 mol / l potassium persulfate initiator solution was added and reacted for 20 h. The polymer was dissolved in water to prepare a concentrated solution of PAAST.

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Abstract

The present invention discloses one kind of hydrophobic associated water soluble copolymer with high viscosity raising performance and its preparation and use. The present invention features that acrylamide in 20 portions, anionic and / or cationic monomer in 0.3-20 portions, p-alkyl styrene in 0.1-7 portions, surfactant in 0.3-205 portions and deionized water in 40-1700 portions are added into flask with stirrer, thermometer and nitrogen canal, and after regulating pH value to 2.5-9 and introducing N2 for 30 min, initiator in 0.003-2.0 portions is added at 20-70 deg.c for reaction of 6-30 hr to obtain the hydrophobic associated water soluble copolymer. The copolymer may be used in oil displacing agent in oil exploitation, thickener in water-base paint, flocculant in water treatment, etc. and has excellent application foreground.

Description

1. Technical field [0001] The invention relates to a high viscosity-increasing hydrophobic association water-soluble copolymer, a preparation method and application thereof, and belongs to the field of polymer materials. 2. Technical background [0002] Hydrophobic association water-soluble polymer is a copolymer containing a large number of hydrophilic groups and a small amount of hydrophobic groups. Its solution has unique properties such as thickening, salt resistance, and shear resistance. Thickness, water treatment, fluidity control, cosmetics, biology, printing and dyeing, mining and many other fields have good application prospects. Researchers at home and abroad have done a lot of research and exploration work on the structure, properties, viscosity-increasing mechanism and application of hydrophobically associated water-soluble polymers, but the solubility and thermal stability of polymers are the two major research areas of hydrophobically associated polymers. pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08F212/12C08F220/56
Inventor 黄荣华钟传蓉
Owner SICHUAN UNIV