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Method for preparing temperature-resistant and anti-salt type polyacrylamide

A polyacrylamide, temperature-resistant and salt-resistant technology, which is applied in the field of preparation of multi-copolymer type temperature-resistant and salt-resistant polyacrylamide

Inactive Publication Date: 2006-08-09
大连广汇化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, many scholars have done a lot of research work, such as introducing large side groups or rigid side groups (such as styrene sulfonic acid, acrylamide long-chain alkyl sulfonic acid, etc.) High thermal stability, using a hydrolysis-resistant monomer (such as N-alkylacrylamide) to copolymerize with acrylamide to obtain a polymer with excellent temperature and salt resistance; introducing a monomer that can inhibit the hydrolysis of the amide group (such as N-ethylene -2-pyrrolidone) improves the temperature resistance and salt resistance of the polymer; the introduction of salt-insensitive sulfonic acid groups (such as 2-acrylamido-2-methylpropanesulfonic acid, etc.) in the molecular chain makes the PAM The performance of temperature resistance and salt resistance is obviously improved; hydrophobic groups (such as 2-methacryloyloxyethyl-dimethyl dodecyl ammonium bromide, etc.) are introduced into the molecule, and the hydrophobic association of hydrophobic groups is improved. PAM has heat and salt resistance properties, but it still cannot meet the requirements of tertiary oil recovery with reservoir temperature > 60°C and salinity of 5000mg / l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] In Example 1, 111.41kg of deionized water was put into the kettle, and 4.4kg of sodium carbonate, 23.2kg of acrylamide, 2.5kg of urea, 4.9kg of 2-acrylamido-2-methylpropanesulfonic acid, 1.02 were sequentially added under stirring. kg methacrylic acid, 0.02 kg dimethyl diallyl ammonium chloride, 0.05 kg magnesium oxide, 1% glyoxal 0.5 kg, 2% sodium lauryl sulfate 8.0 kg, 1% ammonia water 5.0 kg, 1% 4,4'-Azobis(4-cyanovaleric acid) 12.0kg, 2% β-dimethylaminobutyronitrile 2.5kg, 2% 4-cyanopyridine 12.0kg, adjust the initiation temperature to 22℃, and pour into nitrogen To remove the dissolved oxygen in the reaction system, 12.5 kg of 0.1% ammonium persulfate was added after 30 minutes of passing. After about 20 minutes, the material in the kettle began to become sticky and began to heat up. After 5 hours, the temperature in the kettle reached 78°C and heated to 115°C. Hydrolyzed for 6 hours, then granulated, dried, and pulverized to obtain temperature-resistant and salt-resis...

Embodiment 2

[0009] In Example 2, 78.55kg of deionized water was put into the kettle, and 8.5kg of sodium carbonate, 39.1kg of acrylamide, 3.0kg of urea, 7.5kg of 2-acrylamido-2-dodecylethanesulfonic acid were sequentially added under stirring. , 4.31kg itaconic acid, 0.24kg acryloxyethyl trimethylammonium chloride, 0.3kg talc, 1% vinyl acetate 2.0kg, 2% OP 10 25.0kg, 1% ammonia water 6.0kg, 1% 2,2'-azobis(2-amidinopropane) dihydrochloride 8.0kg, 2% β-dimethylaminobutyronitrile 2.5kg, 2% pyridine 5.0kg , Adjust the initiation temperature to 15°C, blow in nitrogen to remove the dissolved oxygen in the reaction system, add 10.0kg of 0.1% potassium persulfate after 30 minutes of flow, after about 20 minutes, the material in the kettle will start to become sticky and start to heat up, the temperature in the kettle will be 8h later After reaching 72℃, heating to 100℃, hydrolyzing for 5h, then granulating, drying and pulverizing to obtain a molecular weight of 21 million and a viscosity of 58mpa·s i...

Embodiment 3

[0010] In Example 3, 114.02 kg of deionized water was put into the kettle, and 7.1 kg of sodium carbonate, 48.5 kg of acrylamide, 1.0 kg of urea, 4.5 kg of 2-acrylamido-2-methylpropanesulfonic acid, and 0.15 were sequentially added under stirring. kg butenedioic acid, 0.54kg N,N-dimethylacrylamide, 0.55kg kaolin, 1% vinyl acetate 5.3kg, 1% flat plus 15.0kg, 1% ammonia 0.5kg, 1% 4,4-azo Bis(4-cyanovaleric acid) 0.24kg, 2% β-dimethylaminobutyronitrile 0.2kg, 2% ethanolamine 0.4kg, adjust the initiation temperature to 18°C, blow in nitrogen to remove the dissolved oxygen in the reaction system, and pass for 30 minutes Then add 2.0kg of 0.1% sodium persulfate, and after about 20min, the material in the kettle will become sticky and start to heat up. After 10 hours, the temperature in the kettle will reach 68℃. Heat to 95℃, hydrolyze for 8h, then granulate, dry and crush A temperature- and salt-resistant polyacrylamide with a molecular weight of 20.12 million and a viscosity of 60 mPa·...

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PUM

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Abstract

This invention relates to a preparation method for temperature-proof and anti-salt PAA, which adds PAA monomer solution with 18-30% weight density, hyhrolyst, composite initiator and aids in a polymerizing kettle, then penetrates N2 to remove O2 for heat isolation polymerization to be hydrolyzed, sized, baked and crushed to get the final product characterizing that during the process, salt-proof monomers, drain monomers, anion monomers, inorganic compounds, micro-cross-linkage are added to carry out heat-insulation copolymerization.

Description

Technical field: [0001] The invention relates to a temperature-resistant salt-resistant polyacrylamide, which belongs to a preparation method of a multi-element copolymer type temperature-resistant salt-resistant polyacrylamide. Background technique: [0002] At present, in view of the characteristics of high reservoir temperature and salinity in tertiary oil recovery, in order for the oil-displacing agent to achieve the desired effect, the polymer must have good viscosity-increasing ability and strong temperature, salt and shear resistance. Cut ability. To this end, many scholars have done a lot of research work, such as the introduction of large side groups or rigid side groups (such as styrene sulfonic acid, acrylamide-based long-chain alkyl sulfonic acid, etc.) on the PAM macromolecular chain to make the polymer have better properties. High thermal stability, the use of hydrolysis-resistant monomers (such as N-alkyl acrylamide) and acrylamide copolymerization to obtain a poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F4/40C08F2/44C08F2/10
Inventor 程芹孙艳霞车吉泰尹海滨崔祜徽张蕾
Owner 大连广汇化学有限公司
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